santo gantry crane

2013年7月31日星期三

The market demand, the need to reform the machinery industry product innovation


     With the machinery industry, more than 10,000 TEU container ship large ship construction and large gas demand is also increasing. In order to shorten the construction period the ship, a lot of outfitting work completed before the staging of total group, making the sub-group of the total weight and dimensions and heavier and bigger and bigger, so the customer requirements of electric hoist  gantry crane  span growing, increase the weight and heavier.

      With modern management requirements, such crane management system with the workshop, factory-level network management systems, will also be on the agenda. Currently we are in the design of electric  hoist gantry crane   generally reserved for communications networking cable interface device, but no one put into use. I believe in the near future, this management system will be gradually implemented.

     Electric hoist gantry crane is small with a simple cantilever gantry cranes. Including electric hoists, traveling mechanism, bridge, legs, and other parts of electrical equipment. For stations, terminals, warehouses garages, construction sites, cement products field, factories, hydropower and other outdoor work places, but also suitable for indoor shop work. The crane working level A2-A5.

     Since these cranes working particularity,  hoist crane  drivers and ground commanders is difficult to fully take into account the items to be hanging around. To avoid a serious plane crash accident, better security measures will be used to this type of crane.

     Current electric hoist gantry crane hoisting mechanism in the car's layout form, generally use single drum hoisting winch, use a winch rope chain drive mechanism winch disposed in the middle of the car, not only reduces the weight of the winch, and use the winch some weight lifting load balancing weight, thereby reducing the weight of the car. With China's machinery manufacturing industry as a whole to enhance the level, instead of in the hardened Hardened reducer reducer, the new structure instead of the traditional wire rope strong, but also makes the body weight has been further reduced. New car weight and the weight of traditional car weight reduction compared to about 1/3.

Crane electrical equipment enclosure must be grounded What are the requirements?

  1 single girder  gantry crane  leakage protection of electrical equipment protected by enclosure must be grounded its ground generally have the following requirements:

     (A) the protection of electrical equipment should be implemented separately grounded metal enclosure.

     (2) single girder  hoist gantry crane  electrical equipment are protected grounded metal enclosure, preferably with power neutral ground apart.

     (2) When unable to meet the above requirements and must adopt a common ground approach, they shall comply with the following requirements:

     (1) using electromagnetic leakage protection, the protection of electrical equipment enclosure can be connected to the protective earth (PE line) or the protection of the zero line (PFN line). In this case, may be checked for automatic switch, single girder  overhead gantry crane  but must be checked leakage protection (zero sequence transformer) dynamic stability and thermal stability.

     (2) the use of electronic leakage protection, the protection of electrical equipment and protective metal casing can also be connected to earth. In this case, in addition to checking the zero sequence transformer dynamic stability and thermal stability, should also check the single phase earth leakage protection when the auxiliary power supply voltage is within the allowable voltage range to leakage protection guarantee reliable operation.

     (3) Ground resistance should be able to ensure reliable operation of leakage protection.

     (4) When the distribution system leakage protection using hierarchical protection, in order to make the single girder gantry crane levels of protection selective action, at all levels of the breaking time should not be the same. At this point, if the protective earth at all levels can not be separated, then the deal breaking time readjusting to meet the requirements of the protection classification.

Gantry crane rail track structure and function description


      In engineering, electric  hoist gantry crane  rail mounting is in between a mechanical and civil engineering fields. Rail mounting is often installed by the plant construction side, while the cranes are cranes installed by the qualified units installed, the two are often out of touch. In engineering construction crane mounting rail track rail mounting beams and often by the two professional (such as civil and mechanical installation) to complete, also there is a disconnect between the two professions.

      Therefore, the electric hoist gantry crane rail installation quality is difficult to be truly guaranteed. Crane rail mounting a direct impact on the quality of the operation of the  hoist crane   Only grasp the quality from the source, in order to ensure the quality of crane rail mounting.

      Crane crane rail track has, railroad rails and square steel. The convex top of the rail and the bottom plate having a certain width, to increase the contact surface with the base; track-shaped cross section, mostly, with good flexural strength. Square steel flat top rail can be seen, due to wheel wear and generally used only for lifting small, run slower, work is not frequent cranes. Rails usually carbon, high manganese steel (C = 015% ~ 018%, Mn = 016% ~ 115%) from rolling. Electric hoist  gantry crane  rails Typical materials for the U71Mn steel. Mainly used square steel Q275 square steel or flat steel.

      Electric hoist gantry crane is used as a crane rail carts and trolleys with special cross-section rails, standard length 9,915,10,1015,11,1115,12,1215 etc. 8. Common specifications for QU70, QU80, QU100, QU120, QU behind the numbers that track width of the head. Railroad rails of two kinds of heavy rail and light rail, rail specifications per meter length with a nominal weight. Weight greater than 30kg / m rail, heavy rail belongs. Standard rail length 12150m and 25100m2 kinds of specifications. LRT is not more than 30kg / m rail, generally the length of 5 ~ 12m. Rail steel, mostly ordinary carbon structural steel and semi-killed steel killed steel, to improve rail wear and corrosion resistance, in recent years, using Mn, Si, P and other alloying elements in low-alloy structural steels.

Gantry crane lifting chain maintenance and care instructions

  1 sprocket mounted on single girder  gantry crane  and a swing axle should not skewed. In the same drive sprocket assembly in two end should be in the same plane, the sprocket center distance of 0.5 meters, the allowable deviation of 1 mm; sprocket center distance of 0.5 meters above, the allowable deviation of 2 mm. But not with friction sprocket side phenomenon, if two series move too prone to derailments and accelerated wear. Replacing the sprocket must be careful to check and adjust the offset.

     2 single girder  bridge gantry crane  lifting chain tightness should be suitable, tight increase power consumption, bearing wear; chain is too loose and easily beating off chains. The tightness of the chain: from the middle of the chain lift or pressure, the two sprocket center distance of about 2% -3%.

     3 The new lifting chain is too long or elongation after use, difficult to adjust, remove links to look at the situation, but must be an even number. Single girder  hoist gantry crane  back through the chain link should the locking plate inserted in the outside, locking plate openings shall be rotated in the opposite direction toward.

     4 sprocket wear serious, it should also be replaced with new sprocket and a new chain, to ensure good engagement. Not just a single or a new replacement chain sprocket. Otherwise it will cause poor acceleration engaging new chain or a new sprocket wear. Sprocket tooth wear to a certain extent should be promptly turned over to use (refer to the surface using the adjustable sprocket) to extend the use of time.

     5 The old part of lifting chain with a new chain can not be mixed with, or easy to have an impact in the drive, pull off the chain.

     6 Lifting chain in single girder gantry crane work to remember to add oil. The lubricants must enter roller and inner sleeve with the gap in order to improve working conditions in order to reduce wear and tear.

Single girder gantry crane accessories reducer working principle

      Reducer used for single girder  gantry crane  and other lifting machinery. Gear reducer gear is the use of all levels to achieve the purpose of deceleration. Reducer gear is formed at all levels, such as with a drive pinion gear reducer can achieve a certain purpose, then such a structure using multi-level can greatly reduce the speed of the.
        Gear reducer is generally used for low speed high torque transmission equipment, the electric motor, engine, or other high-speed operation of power through the gearbox input shaft of a small number of teeth of the gear output shaft gear to achieve single-girder gantry deceleration purpose  hoist crane   Common reducer will have several pairs of the same principle as the gear reducer to achieve the desired effect, the size ratio of the number of teeth is the transmission ratio.
       Gear reducer is a power transmission mechanism, the use of gear speed converters, the number of rotations of the motor decelerates to a desired rotational speed, torque and get a larger organization. Deceleration while increasing output torque, the motor output torque output multiplied by the proportion of reduction ratio, but be careful not to go beyond single girder gantry crane reducer rated torque.
       Deceleration while reducing the load inertia, inertia reduction gear ratio squared. We can have a look at general motors inertia value. General types of gear reducer with helical gear reducer (including parallel shaft helical gear reducer, worm gear reducer, bevel gear reducer, etc.), planetary gear reducer, cycloid reducer, worm reducer , planet friction mechanical transmission machines and more.
       Single girder  bridge gantry crane  accessories gear reducer works according to the different types of differences, and is currently a relatively good performance to planetary gear reducer, planetary gear reducer is a gear transmission mechanism, servo motor driven gear machine sun wheel, the sun wheel and then the driving support arm on the planet planetary gear, planetary gear, through its engagement with the outer toothed ring gear, the drive is connected to the outer ring gear to the output shaft, the purpose is achieved deceleration, gear ratio with the specifications for the gear train.

How to check the crane through the auditory bearing failure?


      Motor in the daily operation of the process if the use or improper maintenance, some failures often occur, such as electric  hoist gantry crane  motor can not start after power, speed too fast, too slow, the motor during operation temperature is too high, there is an exception sound and vibration, motor winding smoke, burning and so on.

      Three-phase asynchronous motor failure generally can be divided into two parts, both mechanical and electrical. Mechanical failures including bearings, fan blades, chassis, coupling, cover, bearing caps, shaft and so on. Including various types of electrical failure of the switch, push button, fuses, brushes, the stator winding, rotor winding and starting equipment. Wherein the total electrical failure faults 2/3, the mechanical failure of the total 1/3.
      How to check the hearing hoist  gantry crane  bearing failure?
      Listen to the sound check
      Top with a screwdriver in an electric hoist gantry crane motor outer bearing cover, carefully listening to the sound of the motor running by the sound of rolling bearings to determine the bearing failure.
    ① heard rolling with irregular crash, then the ball has broken individual phenomenon.
    ② hear the rolling sound vibration significantly, then the bearing clearance is too large, there is the phenomenon of running sets.
    ③ rolling voice crack, sensual heavy, then the bearing oil is dirty, there is intrusion of impurities.
    ④ heard screaming rolling bearing, then the bearing lubricant too little or dry.
    ⑤ sound monotonous and uniform, but the bearing temperature is too high, then the bearing lubricating oil or lubricating viscosity is too excessive.
    ⑥ sound has fluctuated periodically, then the motor load has changed, severity inconsistent.
    ⑦ have been disassembled and cleaned electric  hoist crane  bearing cap in hand, forcefully rotate the outer ring, If you hear a noise and vibration uneven sense, then the bearing clearance is too large.

2013年7月30日星期二

Gantry crane parts bearing cleaning Maintenance Act

      Single girder  gantry crane  bearing exercise for some time, to maintain a certain level of vibration and noise, the spectrum is very simple, just thrown one, two multiplier. Rarely thrown more than three times the frequency spectrum, bearing condition very chaotic, chaos into the working period. After running into use late succession, bearing vibration and noise begins to increase, sometimes appearing different sound, but the change in vibration increases more slowly this time, bearing kurtosis value starts Passed reaches a certain value.
       For as long as possible in order to maintain good condition single girder  bridge gantry crane  bearing the original function, to be maintained, inspection, in order to prevent accidents in the first place, to ensure the reliability, improve production and economy. Home for the best mechanical operation corresponding premise of the scale, on schedule.
        Including supervision of operating conditions, add to or replace the lubricant, assembly inspection schedule. As a single girder gantry crane operation inspection items, a rotation of the bearing sound, vibration, temperature, the state of the lubricant.
        Cleaning oil while rotating, while carefully cleaned. In addition, cleaning the oil have always insisted clean. And repeatability is very good. Normal quality bearings (linear bearings) started, the vibration and noise are relatively small, but somewhat messy spectrum and amplitude are small, probably because some flaws in the manufacturing process, such as the appearance of burrs due.
        Single girder  overhead gantry crane  bearing cleaning: lower bearing assembly inspection, the first record bearing the appearance of confirmation remaining amount of lubricant, the lubricant used after sampling inspection, wash bearings. Cleaning Precautions: as a cleaning agent, general use gasoline, kerosene. Removed to the bearing cleaning, cleaning of coarse and fine cleaning, were placed in a container, first put the metal mesh bottom, so that no direct contact with the container bearing the dirt.

Crane Bearing Precautions

   Bearings are very important accessories hoist crane s, lifting equipment and accessories bearing the stick when the crane must determine each axis of the bearing type and scale to match the crane, to select a bearing on the shaft or bearing bore device approach and fixing means, the method is also very important. Here are some electric hoist  gantry crane  bearing Caution:

     1 to keep their environment clean bearings
     Electric hoist gantry crane even invisible fine dust into the bearing, will increase the bearing wear, vibration and noise.
     2 Use the installation should carefully
     Allowed a strong punch electric  hoist gantry crane   allowed a direct hit with a hammer bearing, are not allowed to pass through the rolling pressure.
     3 Use the appropriate tool for the correct installation
    Whenever possible, use special tools, such as special heater Bearing pullers and tools, try to avoid using fabric and staple fibers and the like.
     4 to prevent corrosion of bearings

      Electric hoist gantry crane reducer or in the wheel bearing housing, if the radial bearings and radial thrust bearing inner race direction of the orientation axis is fixed, so in these axes axis transformation the time when the device is the device on the outer ring are fixed in the bearing bore, which is fixed to the device bearing inside the bearing sleeve, also according to the type of bearing device and means for way, so that the needs are based on the use of the resolution. As long as the correct equipment cranes bearing, competence extends the use of the machine life, the greater the efficiency of the limit for promotion, to bring customers more benefits.

Gantry crane cab rehabilitation programs


     Single girder  gantry crane  into a high-quality welding of high strength profiles skeleton, covered with high-quality after CNC machining rolled plate, the entire cab shape crisp flat. In the skeleton on the internal lining of fireproof, heat insulation, sound insulation materials after the interior, surrounded by decorative MDF and decorative aluminum plate or sheet steel riveted shape. Windows usually 5mm thick toughened or laminated safety glass, etc., the transmittance of not less than 80%, the glass through the rubber moldings fixed, move the window to window frames made of aluminum or steel profiles, through the rubber moldings fixed, front windshield with safety railing. Insulation steel doors for the band structure sliding door or open the door, above the door with a glass fixed windows, central handle with inside and outside the cab with special locks, sealing strip around the use of double-sealed.

       Indoor floor using removable 4mm thick steel plate, and in the upper part of anti-skid rubber insulated green carpet. Control wire under the floor can lead frame bundle, cable outlet for cable anti-wear treatment. If the outdoor band platform on the floor for the pattern, hot galvanized grating. Single girder gantry crane cab paint with epoxy zinc-rich primer, epoxy intermediate coat of iron, polyurethane topcoat, the total film thickness of not less than 210um. Indoor usually equipped with fluorescent lamps with a protective cover, light switch and a spare power socket, mounted at the front windshield wiper and washer devices.

       In some of the single girder  bridge gantry crane  work efficiency and work very frequently demanding work environment that does not allow the crane driver on and off several times to delay lifting working hours, such as steel crane or some ports of loading and unloading cranes, as well as Some high-temperature dust lifting environment, resulting in the crane cab operating environment is poor, which are on the hoist crane driver's normal physiological function and mental state affected, seriously affect the safety in production. Therefore, the operation of the crane cab environment gradually humanized designed or modified by some large steel mills or Hong Kong 13 units made when ordering. Not only improve work efficiency, improve the operating environment, but also contribute to the crane driver to maintain a good working condition, is conducive to safety in production.

       Single girder gantry crane driver's cab really hope it is a question in the flow, renovated "The Office." In order to allow the driver to find a "office" type of safety and comfort, in order to ensure the health of employees, improve work efficiency, user-friendly design crane cab is extremely important transformation.

Introduce you to the single girder gantry crane structural properties

 In the crane category, single girder  gantry crane  with double girder gantry crane compared to its overall stiffness may be weaker, but still holds its unique advantages of the crane machinery industry is not a small field. Now to tell you about single girder gantry crane product features:

1, the whole by the bridge, traveling mechanism, trolley and electrical equipment and other components.
2, single-girder bridge with box, L OK legs welded structure, safe and reliable.
3, single girder  bridge gantry crane  into the form of a conductive cable reel trolley line and style, can choose. ,
4, using the conductivity type rail cable car conductor.
5, parts standardization, generalization and seriation.
6, put all the electrical equipment in the electrical room, ease of maintenance. Select the unit, please indicate the working environment of the highest, lowest and power supplies. Can be designed according to user requirements change.
7, single girder gantry crane used in mining, port, railway cargo terminals, open storage and other materials handling and transport, can be equipped with multiple spreader for special operations.

     Single girder  hoist crane  hoisting mechanism main structures include, operating agencies, luffing, slewing mechanism and metal structures such as fabrics made ​​of several parts, each agency has its own terms of reference are irreplaceable so say you want to operate it well, only to learn more about it in order to better use it.

Crane lifting program steps

     According electric  hoist gantry crane  test pile construction situation, piles generally 15 meters, so basically steel cage in this length. The high water table due to space, so pouring concrete pouring method are used underwater, catheters need to extend to the bottom part of the pile, pipe and hopper together a total length of more than 15 meters, shall be vertical lifting, so the project was lifting objects height is high.

    1 electric hoist  gantry crane  hoisting machine of choice: use in conjunction 25t truck crane lifting operations carried out in this project.
    (2) In the reinforcement steel cage welding on steel rings, rings welded to the top of the steel cage with a rope tied with snap ring with lifting, lifting, lifting slowly to prevent plastic deformation reinforcement cage, wire rope size: 6 × 37 +1- φ15.5.
    3 steel cage lifting height of two meters over Weidang only when the electric hoist  overhead gantry crane  jib rotation to the floor. Rotary drilling rig should take necessary precautions to prevent the collision.
    4 steel cage hanging from holes in the top after slowly falling under the command of someone close to orifice pairs again only after the reinforcement cage down into the hole, and to ensure that the vertical reinforcement cage into the hole, to avoid holes wall of mud into the hole. Must be in strict accordance with the rules and operating  operators operating personnel must be certified.
    5 steel cage into the hole, press the hole depth of the catheter connection into a whole, and were linked with the hopper, hanging into the hole. With the pouring of concrete, according to the depth of electric hoist gantry crane with lifting conduit, pouring up to a certain height, the catheter stuck in the base, remove the excess catheter until the concrete pouring into the hole.

Electric hoist gantry crane structure analysis


  Electric  hoist gantry crane  is a simple crane, single girder and double girder two kinds. Due to simple structure, easy to manufacture, light weight, low cost, easy installation and maintenance, etc. has been greatly developed, widely used in industrial and mining enterprises, railways, docks, warehouses, material and other places. However, due to electric hoist gantry crane structure is simple in design, production, installation, inspection process, failed to pay sufficient attention. Electric hoist  overhead gantry crane  in use process, due to defects in leg connection, cracking and other hazards arising from capsizing accidents have occurred. Therefore, in the test session, focusing on electric hoist gantry crane outrigger installation quality inspection is to ensure the safe production, accident prevention is an important safeguard.
    Span girder design position with legs attached on both sides neither rectangular steel beam flange bolting, nor rectangular steel flanges welded way, but the position of the main beam span both sides of the legs connected The upper beam of a beam made out in the form of the flange can not be connected with the leg in the field can only be used when connecting pad steel beams welded connections on the way, the manufacturing process may be due to the level of a problem, or factory on-site installation, the installation site 4 legs than the plate thickness of the pad gap, the beams and legs can not guarantee the effective contact area of ​​the flange, does not meet the requirements of GB3811, easy to instability. Electric hoist  gantry crane  operation easily reversed, deformation, resulting in shaking legs do not meet the requirements of the welding phenomena equally easy to produce due to uneven force fracture, shaking the crane operation, torsional vibration caused by tearing overturning the case.
        Electric hoist gantry crane track gauge deviation carts, cart tracks throughout the elevation difference and the same section do not meet the level of poor standard. Especially the two rail joint gap is too large, the maximum clearance is 25mm, carts passing a greater shock.
       Under the crane beams carts drive motor (conical brake motors) brake adjustment is not synchronized. Since the left side of the drive motor brake adjustment carts too loose, right carts drive motor brake adjustment too tight, resulting in carts running on the left than on the right carts carts run faster running speed, causing the system to run or moving back and forth when reversing operation. Carts orbit model and electric hoist gantry crane random file does not match the design model.

2013年7月29日星期一

Gantry crane beam pulley installation instructions

   Electric  hoist gantry crane  beam pulley power series led closing argument by the pulley, cable pulley, terminal tackle three parts, mechanical traction pulley moves with fairlead (traction) devices, each equipped with a mobile machinery, with the moving machinery from operation. Intermediate cable pulley hanging in the cable within the I-beam track with the traction pulley moves, and ends with the buffer hit head pulley may be different depending on the length of the number of moves. I-beam rail terminal block fixed at the end of each mobile machinery generally set one. Tractor for the cable head-end, the terminal is a fixed hanging wire frame, the middle of the cable pulley, the series tackles points Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ five models.

    Electric hoist  gantry crane  beam pulley installation instructions:
    1, the fixed frame hanging wire installed, should be hung behind a baffle.
    2, adjust the traction head so that the car in the whole trip up and down the hole without touching the edge of traction as well.
    3, the cable length is 1.2 crane span doubly 8 m.
    4, adjust the traction electric hoist gantry crane rope to the same section of the cable length is less than the length of run time by the traction rope force.
    5, when the cable diameter range, the cable clamp should be between a soft rubber pads to the same diameter, so that the cable clamp.
    6, cloth cable, the cable should consider both sides of the pallet force balance.
    7, when the cable pulley is two, three, require the same.
    8, electric hoist  gantry crane  pulley device for the adjustment of the double washer washer, when rail unsuitable, the washer on the inside of the fixed plate to adjust the width of the gauge. Non-standard pulley manufacture according to the drawings.

Gantry crane metal structure material introduced

     Universal  gantry crane  metal structure mainly refers to the main beam, legs, lower beam and so on. Metal structure material is Q235 by shot blasting, rust treatment.
    (1) metal structure comprises a box-shaped main beam, four legs, two lower beam components. For the lower beam girder hoist operation. A buffer in the main beam ends butting heads, GM girder gantry crane with four legs rigidly connected to the upper part, the lower end of the lower leg beams rigidly connected to two lower beams of the installation of a traveling mechanism.
   (2) for the box girder structure, the bottom plate, the web, and large and small ribs, longitudinal ribs and other components, has good stiffness and strength, the main beam with upper camber across the middle and upper camber control In (1.1/1000 ~ 1.4/1000) S. maximum camber can be controlled in the range of mid-span S/10. Loaded girder natural frequency greater than 2Hz.
   (3) Universal gantry crane traveling mechanism with four running wheels mounted on the lower ends of beams, two of which are active wheels, two passive wheels, using two independent drive unit respectively symmetrical drive.
       For universal overhead gantry crane  provides raw steel, welding material must have a certificate of compliance or the original warranty book, all steel must undergo a rigorous pre-treatment. Assembling structural parts before welding, depending on the size of the cutting, respectively, with CNC cutting, imitation wood cutting or general cutting, shearing materials used for general cutting. Major welds using CO2 mixed gas welding, automatic welding and so on. Butt weld with automatic welding, weld flaw detection according to design requirements.

How to fix the crane girders sinking failure

  Gantry crane prestressed girder method Hugh complex, there are two basic ways to sink, one hand stretched, the other is mechanical tension. The former with a repair in a small crane lifting weight, which is used for larger sinking from the weight of the crane girder repair.
   (1) lever.  gantry crane  trolley round by the end of the rod and welded rod group, but must ensure that it bit concentricity, after welding, careful examination, testing and inspection should be done conditionally. Round general use 45 steel production, and after heat treatment. To avoid breakage and slider rod end, prestressed rod can be divided into single and double row arrangement. Symmetrical arrangement of the vertical axis of the main beam, rod cloth Ge width should not exceed the width of the main beam, if necessary, enter should not exceed 50mm, rod spacing is determined according to the operation to facilitate the needs of single rod tensile force should not exceed 150kN as appropriate.
       Rod end nut and nut sub-working construction nuts, nut job tensioned by tightening into service and should be applied to pre-fastened side lever to keep the long-term effects prestressing. Work nut requires thick and require end rod of the same material.
    (2) the support frame. Supporting frame structure from the floor, side panels and welded into the ribs. Base plate and end plate requirements smooth outer plane, to ensure the support frame and  hoist gantry crane  girder and working under the cover of dense nut paste. Supporting frame slightly wider than the width of the base plate under the cover of the main beam width of the main beam and floor thickness equal to the thickness under cover. Side plates for the main mechanical parts, generally thicker, the distance between the ribs and rod center distance equal to the distance between side hole to the edge of not less than 80mm.
    (3) hanger. Each door crane girders under the Ge hanger, usually three, L> 22.5m can be set 5. Figure 8-17 is one form. Hangers welded to the main beam only allowed under the cover, not with webs welded.

Gantry crane parts simplify the structure plan implementation


       gantry crane   at the institutional development of new transmission parts to further simplify the organization. "Triple play" operating agencies is the world's light, intermediate crane operating agencies of the mainstream, the motor, reducer and brake combined into one, with a compact, lightweight and beautiful, easy disassembly, easy to adjust, smooth running, matching range etc., have been widely applied to various foreign crane operation mechanism.
      To enable small and medium-tonnage crane trolley structure as simple as possible, while reducing the size of  overhead gantry crane  height, reducing wheel pressure, electric hoist abroad have been widely used as a lifting mechanism. In order to reduce weight, improve the bearing capacity, improving manufacturing conditions, increase product yield, components as far as possible to weld cast behalf, such as gearbox housings, volume reduction, pulleys and so welded structure. Reducer gear tooth surfaces are used to reduce weight, reduce the volume and improve the bearing capacity and increase service life. Hydraulic disc brakes putter range of applications is also growing.
      In the electronic control aspects of the development of good performance, low cost, high reliability and speed control system and electric control system, the development of semi-automatic and fully automatic operation. Liquid using electromechanical integration technology to improve the gantry crane performance and reliability, increasing the crane functions. The future will be more emphasis on crane safety. Development of new safety devices.
      In addition,  bridge gantry crane  bodies are used to the high-speed development of the motor, thereby reducing the number of the motor base, reduce weight and reduced dimensions, and can be equipped with a braking torque small brake.

Lifting Complete integrated product portfolio

      Currently focusing on the development of common  gantry crane   and other handling factory automation systems, flexible manufacturing systems, commercial cargo delivery distribution systems, container loading and unloading systems, transport and telecommunications sectors parcel cargo handling system with automatic sorting.
       In general  bridge gantry crane  stand-alone automated basis, through a computer to compose a variety of material handling equipment integrated material handling system, through the control of the central control room, and the combination of production equipment, and production systems coordination. Such crane high degree of automation with information processing functions, the sensor can be detected in the implementation of various information storage, computing, logic, transform treatment process, thus issue control instructions to the implementing agencies.
       Universal gantry crane structure shaped thin-walled steel profiles and reduce seam stitching structure and improve fatigue resistance. Kai strength low alloy steel using a variety of new materials to improve the bearing capacity, improve force conditions, to reduce weight and increase the aesthetic appearance. Bridge crane bridge structure type mostly used box-four beam structure, main beam and side beams of high strength bolts, easy to transport and install.
       Universal  overhead gantry crane  also has good information input and output interfaces, to achieve all information accurately and reliably integrated material handling systems in the entire transmission. Crane through system integrators, can form different models of the best match and mix each other, play the best effect.

Unforeseen circumstances to enable the driver or operator trapped altitude how to do


    Gantry crane driver or encounter unexpected situations that workers were trapped altitude how do
   (1) on-site guard and isolation. Scene to scene by the alert based on the implementation of regional security group isolation, and to ensure smooth flow of relief.
   (2) disaster relief group, the rapid mobilization of rescue personnel  gantry crane   and other equipment hydraulic lifting platform or through high-altitude trapped bit Ge channel arrived to help trapped people out of danger zones. If an officer is injured, depending on the particular circumstances, with the safety rope or some other method of dipping transfer the wounded.
   (3) If hazardous  overhead gantry crane  spreader or lifting objects, you should switch the standby power supply, as the case hanging objects or fixed bit Ge.
   (4) Rescue equipment operator shall obtain special equipment operator certificate and operating license ascend professional maintenance personnel, and must wear the necessary protective equipment (seat belts, helmets, anti-slip shoes, etc.), and to take the necessary measures to prevent persons falls from a height.
   (5) high-altitude, ground rescue personnel should be unified command, coordinated action can be set to prevent the ground according to the situation and rescue trapped personnel from falls from a height  bridge gantry crane  protection measures (inflatable cushioning, protective nets, etc.).

Crane proper grounding instructions

  (1) Universal  bridge gantry crane  power supply is directly grounded neutral point of low pressure systems, the overall structure of the metal grounding type should adopt the TN or TT system. TN earthing system used to protect the zero line before the introduction of metal structures, neutral grounding if the distance to the power plant or other protected ground zero line should be done repeatedly over 50m ground, which can reduce common  gantry crane  equipment enclosure to ground voltage leakage reduce the Zero Line enclosure leakage after shock hazard, increasing the phase line in the short-circuit current protection device on the line speed of the action, to shorten the duration of failure, or when the zero line is disconnected, the device will lose any leakage protection.
     (2) Universal  overhead gantry crane  grounding cable and grounding, grounding cable and metal structures (or carts track) must be reliable soldering. Not the line, which ensure the metal structure and the ground conductor continuity between devices.
     (3) ground cable should be selected puzzle section is not less than 2 150 r 10 r puzzle flat or copper, with round grounding cable to do, its diameter should not be less than 13.8 mm.
     (4) through the common ground rail carts gantry cranes, carts rail joints should be a reliable electrical connection.

Universal gantry cranes erecting techniques comply with the rules

     Universal  overhead gantry crane   because they belong to large equipment, so installation should be done by erecting a qualified professional with the installation department is responsible for. Erection of the installation process, to observe the following safety technology rules:
    1, Universal gantry crane erected before the commanding officers of all personnel should participate in erecting details lifting method, lifting step, command signal, precautions and individual responsibility should be borne by the members.
    2, Crane Erection area without adequate lighting equipment is prohibited at night erection work.
    3, prohibits any person with common  gantry crane  with lifting, nor along the rope or pulley drop.
    4, in the erection area, to ensure that persons charged shall not touch bare.
    5, erecting crane lifting process, forbidden to stay in or pass under the crane. With the erection erection unrelated persons allowed to enter the area.
    6, should be placed on the prevention of power lifting and ensure effective braking system.
    7, in order to check whether the work is completely normal erection, should be first crane lifting off the ground 100-200 mm, stay for some time to carefully inspect all lifting equipment and lifting tools have all the right places, is firmly tied, cranes focus is appropriate so that only parts of correct recognition only after the formal erection of work to do.
    8, Universal  bridge gantry crane  installation put to the lower beam when the first track, then the legs and lower beams fixed cable connection and with the wind, and then lifting the leg of the main beam, integrally connected with bolts final lifting trolley. For the main beam length greater than 35m, you need to be bolted into the ground then lifting the whole.

2013年7月28日星期日

Since reform and opening briefly the development of machinery industry

After the founding of New China, China has established a planned economic system, for a long period of time, economic development greatly influenced by the national plans, common  gantry crane   and other machinery industry especially. Mechanical products are production areas, almost completely in accordance with national allocation plans, can not be marketable, which limits the market and other factors on the machinery industry pulling and guiding effect.
        China is still the emergence of a cluster of machinery industry, heavy industry base in northeast most representative, for example, Shenyang West District of the mechanical processing industry cluster, Changchun automobile industry clusters, such as Harbin Power machinery industry cluster. Using today's perspective, the new Chinese initial generic  hoist gantry crane   and other machinery and industrial clusters although there is a certain lack of, but at the time a poor and white situation, and justifies become China's heavy industry an important force for the construction of new China to do a great contribution, as various regions especially in the Northeast mechanical source of industrial competitiveness.
       On the other hand, this period of universal gantry cranes and other machinery industry cluster is entirely a product of the planned economy, industrial cluster development and growth of many conditions are not met. Is a clear evidence into the early 1970s, heavy industry base and Northeast Northeast industrial clusters began showing signs of decline, perhaps signs did not cause the government's full attention, perhaps no more effective way to develop into the after the 1980s, this recession has become increasingly serious.
       With the continuous progress of reform and opening up, China's general gantry  hoist crane  and other machinery industry gained new opportunities for development, correspondingly, to create the conditions and the concept of industrial clusters have gradually matured.

On the lifting machinery industry structural adjustment programs

 Over time, the supply and demand balance, oversupply, the lifting machinery industry growth rate of some growth will tend to decrease gradually into conventional rapid growth track, previously explosive supernormal growth will be difficult to achieve. Currently rely on a new growth point of change, driven by way of extension and expansion space for machinery industry growth was significantly reduced. To maintain sustained and rapid development of machinery industry, we must rely  gantry crane   and other machinery to promote industrial restructuring and upgrading of the important means to achieve growth pattern of this important way.
       Promote industrial restructuring and machinery industry is to promote the optimization and upgrading of industrial machinery an important means of sustainable development. Specific focus on performance in the "three optimization": that is the rationalization of the industrial structure, industrial structure and industrial structure optimization of sophistication. Rationalization of industrial structure refers gantry cranes and other machinery industry the proportion of internal coordination of the industry structure, the internal structure of the industry in proportion to their respective.
       Industrial Structure refers to the high-tech industry in the machinery industry, the proportion is increasing, and resource-intensive industries dominated by the structural model to the technology-intensive industries dominated structure paradigm shift.  hoist gantry crane  industrial structure optimization refers manufacturing enterprises through the integration of resources, combining other ways to enhance the degree of concentration in order to enhance the international competitiveness of the market.
       Present, China has gradually entered the middle stage of industrialization process, in this case, if it continues to rely on putting in a lot of factors of production, with the extensive mode of growth to boost economic growth, will result in enormous waste of resources, leading to a shortage of resources, unsustainable growth in the machinery industry. Meanwhile, when the gantry cranes and other factors of production inputs to achieve a given level of technology to increase economies of scale after the next, if it continues to increase investment, can only lead to diminishing returns to scale, with high input, low output, high consumption and low efficiency of the situation . Therefore, the machinery industry will need to over-dependence on fixed asset investment and export-led growth model for the extensive growth mode transformation rely on domestic demand to expand and upgrade the structure of demand driven, relying on scientific and technological progress and improve the efficient use of inputs, focusing on resource conservation, environmental protection intensive growth.

Brief characteristics of industrial advantages of general purpose relay


   gantry crane  in the general process of development, according to market segments analyzed companies can develop more precise positioning. To keep up with the pace of development, now more and more  hoist crane  industry will introduce e-commerce platform, in order to provide better sales channels and platforms, tonnage crawler crane industry should also be combined with e-commerce platform for development.
       Universal gantry crane in the industrial market, as technology is relatively easy to reduce barriers to market entry, gradually increasing the number of suppliers, many started to low voltage distribution products suppliers, are active in recent years in industrial R & D and production of general purpose relays .
      Industrial General Purpose Relays small size, simple in principle and other characteristics, determines the most industrial general purpose relay products are sold through agents. Universal  hoist gantry crane  in the industrial market, the majority of the product is relatively simple requirements are relatively simple, the client can be used directly without the need for third-party guidance, the customer usually only make purchases through the channel. Some customers have their own matching panel builders, electrical engineers usually only need to produce drawings, specify the brand, by the panel builder for procurement and installation.
       Whether it is in design or equipment must meet the overall performance needs of the times, in the common gantry crane design process should pay more attention to equipment interoperability and flexibility for easy maintenance, etc., can also be carried out according to the amount of the special needs of the user a tailored such strength to be able to meet the ever-changing development of the times today.

On the gantry crane parts motor heat Symptom Cause

  For a variety of motor  gantry crane   the inner core and windings are made composition. Windings resistance, power will produce losses, loss of size and resistance and current proportional to the square, which is what we often say that the copper losses, if the current is not a standard DC or sine wave, but also produce harmonic losses; core with hysteresis eddy current effect, the alternating magnetic field will produce loss, the size of the material, current, frequency and voltage, the called iron loss.
       Copper and iron losses are manifested in the form of heat, thus affecting the efficiency of the motor.  overhead gantry crane  motors are generally pursuing positioning accuracy and torque output, efficiency is relatively low, the current is generally relatively large, and the high harmonic components, the frequency of the alternating current change with the speed, and thus heat conditions prevailing stepper motor, and the situation is more than AC motors generally serious.
       Allow motor heating degree, depending on the  bridge gantry crane  inside the motor insulation class. Internal insulation properties at elevated temperatures (130 degrees) will be destroyed. So long as no more than 130 degrees, the motor will not be damaged, but this time the surface temperature will be 90 degrees or less. Therefore, the stepper motor surface temperature of 70-80 degrees is normal. Useful for simple temperature measurement point thermometer, it can roughly judge: hand can touch more than 1-2 seconds, no more than 60 degrees; hand can touch, about 70-80 degrees; few drops rapidly gas of, the 90 degrees of.
       Gantry crane motor with constant current drive technology, the stepper motor in the static and low-speed, the current will remain relatively constant, in order to maintain constant torque output. High speed to a certain extent, the internal motor back EMF increases, the current will gradually decline, torque will fall. Therefore, heat generation due to copper loss situation brought a speed related. Generally static and low-speed high fever, high speed, low fever. But the iron loss (although a smaller proportion) changes the situation is not always the case, while the motor is heating the entire sum of the two, so these are just general.

Crane Operation essentials introduction

  Future crane to intelligence, technology and human development is an inevitable trend.  gantry crane  requirements in this regard on the development of methods to update enterprises, but also requires companies to be innovative, active use of available resources, the development of their own products.
        Crane operations essentials steady, accurate, fast, safe and reasonable. Stability refers to the lifting and during operation, the hook and the lifting of the material to be stopped in the desired position, no couples swing and shaking; quasi hook is able to smoothly and accurately stop at the desired position; fast refers to the steady and accurate, based on the gantry crane with the operating agencies coordinated efforts to minimize the time, the nearest distance runs complete lifting work.
        Mentioned here steady, accurate, fast, safe and reasonable aspects are interrelated and indivisible. Instability can not be allowed to fast; does not guarantee safety in production, often an accident, quickly loses meaning; attention to safety and not only fast, it can not give full play to the efficiency of gantry cranes crane; if the operation is unreasonable, not only affect the fast, but also affect the life of the equipment. Just do steady, accurate, fast, safe and reasonable manner, in order to give full play to the role of the  hoist crane  in production.
        Gantry crane in the work process, because improper command and inexperienced, ill-considered, bundling is not strong, or driver operated unreasonable, inattentive, or equipment failure has not been ruled out, sick of work reasons, may accidents resulting in personal or equipment.

Universal gantry crane characteristics and uses

In recent years, China's  hoist crane  manufacturer by continuously improve the product line and improve operating performance to improve product competitiveness, has been relatively neglected to improve product reliability, while the structure of innovation, promote the use of new technologies is relatively small, real-time the introduction of foreign advanced technology Pozaimeishao. In addition, common  gantry crane  product transformation and development, but also pay attention to environmental protection, safe, reliable, energy efficient, to improve product social benefits.
         Bridge gantry crane is supported on the ground through the sides of the legs of the  bridge crane  track, also known as gantry cranes. Universal gantry crane is a general purpose gantry crane, which consists of the door frame, traveling mechanism, lifting cars and electrical parts and other components. Some gantry crane gantry legs on one side only, the other side of the bridge is supported on plants or on the run, called semi-gantry cranes.
        Universal gantry crane gantry by the upper bridge (including the main beam and side beams), legs and lower beams and other parts. In order to expand the scope of crane operation, the main beam may extend to one side or both sides of the outside of the legs to form a cantilever; also be used with a  jib crane  trolley, boom tilt and rotate through the expansion of the scope of crane operation.
        Universal gantry crane has a lifting mechanism, trolley carts run institutions and agencies. These institutions and their components generally generic bridge crane. Universal gantry crane gantry structure of single girder, double girder box, trusses and other types. Extract devices typically employ hook, grab, magnet chuck, can also be dual-use (+ grab hook, hook + electromagnetic chuck, grab + electromagnetic chuck) or with three (hook + Grab + electromagnetic chuck) and so on.

Lifting miniaturization markets have become increasingly apparent

  With the development of society, used crane  gantry crane  more and more areas, and a lot of space do not support large cranes to start work, so this kind of work environment you need to have special skills or construction crane products emerge. About cranes intelligence, technology, and even more humane, the same is to be ahead of the foreign brands of cranes.
        In the modern production process, have become essential equipment crane, gantry crane which can effectively reduce labor and improve production efficiency, accelerate the pace of social construction.
       Polarized development. Here's the so-called polarization refers to its large crane and miniaturization two fronts simultaneously expand development. In recent years, the overall development of comparative gantry crane rapid Chinese construction machinery is concerned, China's large-scale aspects of the crane industry in the leap is particularly prominent.
       Chinese construction machinery can be described as large-scale development of the hoist crane  is especially noteworthy. The gantry crane miniaturization trend reflected more cranes brands in foreign body. overhead gantry crane These miniature crane highway driving ability and special telescopic boom technology combined into one, with cranes feature, you can cross the roof and other obstructions operations.

Lifting carts purchase of technical requirements

1, Universal  gantry crane  must be used compact design, small weight, high and low, reasonable configuration, high transmission efficiency, less wearing parts, maintenance-free rate;
     2, according to the structure set lubrication systems, lubrication points (all Rotary, hooks, pulleys, gear box and brakes, etc.) should be positioned for safe operation;
     3, common gantry crane gearbox chosen must meet the national standard, low noise, good seal, does not allow oil leakage phenomenon;
     4, Universal  hoist crane  brake device of choice, should ensure that when power is braked;
     5, carts run should be smooth, do not chew on rails, low noise;
     6, carts ends with an elastic buffer device, universal gantry crane installation, depending on the distance traveled OK.

Gantry crane hazards exist

1, electric shock and technical personnel on the construction site, distribution methods have not been detailed tests, or operator error; protective equipment is not used correctly, on-site water, wet, wiring or improper use of electrical fixtures;  gantry crane  used in electrical equipment and line leakage protection such as the failure to the harm, the operator is not properly use safety appliances.
     2, the construction procedure against objects fails to carry out the construction and construction programs; gantry crane at heights according to the specified site erection work platforms, operating personnel not wearing a seatbelt, the channel or channel damage poor, poor lighting, etc.; industrial equipment fails correct way to use, component placement does not match the specifications.
     3, gantry crane spreader lifting injuries bundled method does not meet the requirements, ropes, slings defects or wrong choice; member during transit operations, command staff turnovers, spreader, bundling method does not meet the requirements, Rope defective or choose errors.
     4, the poor condition of the vehicle injuries devices exist, construction workers have not been checked, with "sick" to run.
     5, mechanical injury  hoist crane  using angle grinders, welding and other mechanical equipment, construction personnel operation is not made correctly.

Intelligent and machinery industry began to walk the road of green development

Decades of reform and opening up, China's general  gantry crane  has been very good development, its increasing variety, performance and quality is gradually improving. In our country the development of energy saving shouting environment, gantry cranes to meet the safety, reliability and efficiency of the basic performance, while also beginning to move beyond the smart and green development. And in this way to do nothing more than the best of the  hoist crane  industry leading enterprises.
        The past two years, the rapid rise of computer technology in our country, common gantry crane with the aid of computer technology, design concepts become perfect. Developed  jib crane  parameter design makes use of special software  jib crane  safety, reliability and energy efficiency have a very substantial increase, but the product also greatly shorten the development cycle, effectively improve the market competitiveness.
        The modular design of universal gantry crane may increase the manufacturing cost of a small amount, but it can not only improve the yield and quality, but also can reduce management costs, but also correspondingly reduce the user acquisition costs. There are many structural parts are common, then the user can purchase less common structure, these may be staggered idle common parts, thereby reducing the cost of ownership.
        With digital, integrated, intelligent rapid development of technology, high reliability, low power consumption, miniaturization, integration, digitization of various hydraulic, mechanical and electrical components in the common gantry cranes have been widely used, so that transmission and control system is small, light weight, compact structure.

2013年7月26日星期五

Lifting expanding production scale

Lifting expanding production scale


  With the expansion of production scale, increased automation, material handling critical equipment as a  hoist crane  in the modern production process more widely, the role is getting bigger, door   bridge crane    are increasingly high requirements, Science and Technology the rapid development of modern design and promote the improvement of manufacturing capacity, intense competition in the international market has become increasingly dependent on technology competition. These have all contributed to the technical performance of the crane into the new stage of development, the crane is undergoing a huge transformation.
      As industrial production expanding, increasing production efficiency, as well as gantry cranes production process materials and material handling costs proportion gradually increased, prompting a large or growing demand for high-speed crane, lifting capacity is growing, working speed higher and higher, and higher energy consumption and reliability requirements.
      Crane has become automated production processes is an important part. Gantry crane is not only easier to operate, easy to maintain, and the security is better, higher reliability, has excellent durability required, no fault resistance, maintainability and economy of use.
      Industrial production and the diversity of user needs, so that  gantry crane  market continues to expand, the variety is also constantly updated to unique features to meet specific needs, play the best effect.

Universal gantry crane for a wide range of adaptability


Universal gantry crane for a wide range of adaptability

  Despite the financial crisis, China's general  gantry crane  market remained steady upward trend, fully embodies the Heavy Machinery growth of longer periodicity. As China's power, transportation, steel and other infrastructure construction in full laying crane market is also ensues.
     Because Universal gantry crane for a wide range of environmental adaptability and high demand, in order to better meet the construction, port, corrosion proof, nuclear power, paper, waste disposal and other needs of different industries, China's  hoist crane  ndustry markets must pay attention to research and development, adjust the industrial structure, enhance the capability of independent innovation, constant innovation to meet their specialization and large-scale trends.
     In addition, the national planning in emerging industries such as wind power, offshore oil exploration and other industries, will serve as a common market, a new gantry crane industry growth, continue to drive the market forward crane. 2012, China's industrial sales output value of crane products 2,455.0 billion yuan, up 11.7 percent. Small light lifting equipment completed a total industrial sales output value of 38.13 billion yuan, an increase of 12.6%.
     By the effects of changes in the international economic environment, our universal  hoist gantry crane  and other heavy industry usher in rapid development period, its industry growth rate has slowed since the beginning of 2012, showing a growth trend of decline, the main metallurgical and mining machinery industry, material handling equipment industries, such as mining machinery industry growth also affected.

Continuous mechanical handling equipment to promote the development of machinery industry


    As China's mining industry, power industry, port construction, aviation and logistics, warehousing building construction intensified, will continue to drive gantry cranes and other machinery market in particular  gantry crane  equipment and its core components of market development. 2012, China's Continuous mechanical handling equipment to complete the sale value of 25.86 billion yuan, an increase of 26.6%. Tensioning device production was 60,000 units, an increase of 5.7%, the sales value of 1.65 billion yuan, an increase of 0.4%, brakes yield of 4.9 million units, an increase of 22.3%, the sales value of 1.12 billion yuan, an increase of 20.4 %.
      Continuous mechanical handling equipment as a generic device, suitable for almost all use gantry cranes and other heavy machinery industry, the market boom of highly correlated with investment in fixed assets.
      Although China Continuous handling equipment industry started late, but benefit from the national long-term investment in basic industries, in 2012 China Continuous handling equipment market grew rapidly, as other developing countries build their own industries are also attached great importance to a certain extent also  overhead gantry crane  pulling devices of product demand.
      In addition, continuous handling equipment for mining, power generation, ports and other sectors of basic equipment, the normal operation of the device is directly related to the underlying operating gantry crane industry is able to operate normally, right elevator, conveyor products and core components exist rigid requirements.

Machinery manufacturing perennial extensive walking the path of development

Machinery manufacturing perennial extensive walking the path of development



      In recent years, although China gantry crane manufacturing industry is developing rapidly, but the perennial extensive walking the path of development a serious threat to the sustainable development of China's economy, therefore, from extensive development mode shift to sustainable conservation "Made in China "the emergence of new industries - remanufacturing.
      In recent years, the state attaches great importance to the remanufacturing industry and has developed a series of development policies, and expand the range of products and remanufactured range intensify support, but this time, the domestic gantry cranes and other heavy machinery companies have also joined again manufacturing, heavy machinery industry due to its own characteristics, to carry out re-manufacturing business has inherent advantages:
      One,  gantry crane  and other heavy machinery bulky, complex structure, the implementation of a more significant remanufacturing can save resources.
      Two, gantry cranes and other heavy machinery remanufacturing higher value-added.
      Chinese brand crane  bridge gantry crane  companies in the development of the continuous efforts and achievements, not only inspired the Chinese construction machinery enterprises in independent innovation, continue to move forward on the road, but also that Chinese construction machinery enterprises is a real innovation capacity thus we believe that Chinese construction machinery enterprises through the test of time and practice, the future will also be able to cutting-edge diesel technology, new energy technology gains more success, leading Chinese construction machinery to a broader "Blue Sky."

Analysis of Lifting Machinery Import and Export

Analysis of Lifting Machinery Import and Export


National accelerated development of urbanization in China  gantry crane  general market outlook is still very uncertain. To meet the trend of development of the industry, the domestic small and medium enterprises have joined the ranks of electricity suppliers. Lifting equipment factory store small crane companies favor by reason, but also for a reason.
?????? 2013 first-quarter decline in imports of cranes. Especially common gantry crane dropped significantly, or will no longer be dependent on imports. Indicates that China's crane products intensified international competition, small and medium enterprises to develop electricity supplier crane business effect is obvious, local products are more popular.
?????? 2013 a quarter of imports fell more cranes are common gantry cranes, bridge cranes, etc.; export side, the same gantry cranes, bridge cranes share a larger amount. This shows that our  hoist crane  have reduced external dependence.
?????? Single product from a common gantry crane export situation, which is China's small and medium enterprises is definitely a crane good news. One reason is that our product quality improved quickly, out of the country is a fact; the other hand, e-commerce and enterprise, and actively expand sales, lifting equipment factory store with such a platform, opened the network marketing market.

2013 second half of the lifting equipment industry outlook analysis

2013 second half of the lifting equipment industry outlook analysis

Urbanization in the country, large-scale infrastructure construction under the excellent prospects for economic development,  gantry crane   and other machinery and equipment imports appear, showing a more substantial decline in imports of the phenomenon, he explains the changes in the cost, it also shows possible industrial structure adjust and enhance the level of effects of some products emerge. 2013 industry outlook for the second half of lifting equipment will have the following three trends.
1, reduce the cost of technology transfer
????? In recent years, China's gantry crane manufacturer by continuously improve the product line and improve operating performance to improve product competitiveness, has been relatively neglected to improve product reliability, while the structure of innovation, use of new technologies to promote relatively small , real-time introduction of foreign advanced technology Pozaimeishao. In addition, the crane product transformation and development, but also pay attention to environmental protection, safe, reliable, energy efficient, to improve product social benefits.
2, the product tonnage of polarized
????? For now, China's industrial  bridge gantry crane  leap in terms of large-scale particularly prominent, and the trend of miniaturization reflect more cranes brands in foreign body, future product tonnage cranes trend towards polarization. This requires enterprises to increase investment in research and cranes, improve R & D capability, and strive to launch an integrated multiple technologies in one of the "mini" type cranes.
3, intelligent technological humane
????? With the development of society, gantry crane used more and more areas, and a lot of space do not support large cranes to start work, so this kind of work environment you need to have special skills or construction crane products emerge. Future crane to intelligence, technology and human development is an inevitable trend. This aspect requires crane business development tools to be updated, but also requires companies to be innovative, active use of available resources, the development of their own products.

Machinery manufacturing perennial extensive walking the path of development

Machinery manufacturing perennial extensive walking the path of development


 In recent years, although China  gantry crane  manufacturing industry is developing rapidly, but the perennial extensive walking the path of development a serious threat to the sustainable development of China's economy, therefore, from extensive development mode shift to sustainable conservation "Made in China "the emergence of new industries - remanufacturing.
     In recent years, the state attaches great importance to the remanufacturing industry and has developed a series of development policies, and expand the range of products and remanufactured range intensify support, but this time, the domestic  bridge gantry crane   and other heavy machinery companies have also joined again manufacturing, heavy machinery industry due to its own characteristics, to carry out re-manufacturing business has inherent advantages:
     One, gantry cranes and other heavy machinery bulky, complex structure, the implementation of a more significant remanufacturing can save resources.
     Two, gantry cranes and other heavy machinery remanufacturing higher value-added.
     Chinese brand crane gantry crane companies in the development of the continuous efforts and achievements, not only inspired the Chinese construction machinery enterprises in independent innovation, continue to move forward on the road, but also that Chinese construction machinery enterprises is a real innovation capacity thus we believe that Chinese construction machinery enterprises through the test of time and practice, the future will also be able to cutting-edge diesel technology, new energy technology gains more success, leading Chinese construction machinery to a broader "Blue Sky."

Lifting device features automatic windproof presentation purposes


Lifting device features automatic windproof presentation purposes


Work outdoors, such as loading and unloading rail  bridge crane s,  gantry crane   bucket wheel stacker reclaimer, portal cranes, etc. must be installed to prevent being blown away windproof skid devices. Windproof and abroad because no skid mounted device or device failure causes crane was blown away, causing car, crash, rollover serious accidents have occurred.
      Rail clamp, anti-climbers are windproof sliding crane safety device, gantry crane crane working condition, can defend a sudden gust of wind protection play a role in invasion, but also with anchoring devices, wind rope, etc. together, play a non-working state crane safety windproof automatic protection role. Therefore, for such safety devices should be given adequate attention.
      Wind device automatically stops the crane work or power, and in the case of sudden gusts, automatically, to prevent the crane glide. Modern automatic gantry crane is equipped with multi-unit wind anemometer, according to the size of the occurrence of acoustic pressure alarm or auto power off will run institutions and actuate the crane wind stopper device.
       Automatic windproof devices should delay function, to ensure  bridge gantry crane  traveling mechanism on the brake after stopping, windproof device works only in order to avoid a sudden stop, causing excessive inertia. Automatic windproof device commonly used in medium-sized cranes.

State inspection gantry crane security cooperation


State inspection gantry crane security cooperation


Under the agreement, the State Quality Inspection Center gantry crane  with France BV international inspection group will authorize laboratories to collaborate on physical and chemical testing services; inspectors authorized product testing business cooperation; cooperation and personnel qualification assessment (welding, NDT, etc. ) business and other aspects of strategic cooperation, promote bilateral business development.
BV international inspection group was founded in 1828, is the world-renowned international inspection and certification services, focused on the quality of its services, health, safety and environmental management and social responsibility areas of assessment. Since its establishment, BV international inspection group's service network has covered more than 150 countries and regions, with more than 900 offices and laboratories, approximately 40,000 employees worldwide end markets 370,000 different areas of customer service, is within the industry to get the world's governments and international organizations recognized by most organizations. The national quality inspection center and  overhead gantry crane  partnership with BV established national quality inspection center of gantry cranes obtained following the 2009 Lloyd's Register Authorized Inspection Agency after qualifying in the field of international cooperation is another important progress achieved . The signing ceremony, both sides expressed their willingness to physical and chemical testing, personnel certification, product testing, business promotion intensify cooperation and constantly explore new cooperation model  bridge gantry crane  and business areas, in cooperation to achieve mutual benefit and win-win situation. The partnership with the world's leading inspection agencies as authoritative technical support, certification qualifications and national quality inspection center of gantry cranes combine the strengths of test force will enhance the quality inspection center for testing the technical content of the work, to further expand the market and Inspection
Service areas, and promote restructuring and development of Special Equipment Inspection and scientific developments.

From four aspects to analyze the construction machinery market

From four aspects to analyze the construction machinery market

In the study "five" industry planning time, we have formed a consensus, said  gantry crane  ust be strengthened to upgrade such a guiding ideology. Awareness in this respect must be further deepened, as long as we are on the basis of such an understanding, adhere to promote structural adjustment, speed up transformation and upgrading of the machinery industry can continue to achieve long-time stable growth.
1 must be sure that in 2011 the economy has made great achievements. Domestic and international economic environment this year, significantly tightening the background,  bridge gantry crane  machinery industry can do is not easy.
(2) under the pressure of structural adjustment in speed, but the obvious speed, because the relatively rapid growth and sales compared to the majority of gantry crane machinery industry enterprises, most enterprises are done turn pressure into motivation, accelerate structural adjustment, this action while ensuring the rapid growth of the industry.
3 endogenous strain increased awareness.
hoist crane  to further deepen market-oriented reforms.

General safety control measures gantry crane

1, gantry crane is high job construction workers must wear seatbelts, seatbelt fixed location should be safe, reliable, and try to be hung low.
2, ladders, platforms, channels, etc. must be solid and reliable, free surface, suspended operations must be linked to good safety net.
3, construction equipment, industrial equipment, etc. should be regularly inspected, maintained and maintenance. Responsible person should be organized before the start of construction, technical security personnel conduct on-site inspection, in line with the requirements before start.
4, the construction work should be prepared before work safety technical tests, as required make a record.
5, on-site construction personnel should strictly comply with the safety rules and regulations related to safety, proper use of tools and instruments, subject to the security personnel tube
6, lifting and transportation equipment operator jobs before the safety performance of the equipment should be checked to ensure the safe operation of equipment.
7, transport and lifting operations before the deal with lifting or bundled tools and facilities for inspections, proper selection and use, and strictly enforce the "no hang ten" provisions to ensure their safety compliance.
8, to participate in the construction of the relevant personnel must receive safety education before admission after passing the examination before induction.
9, to enter the construction site gantry crane  operators must be required to dress and wear a good safety supplies.
10, special operations personnel must be certified, non-special operations personnel shall not operate.

In-use bridge \ gantry crane girder deflection under Investigation and Analysis

According to GB/T14405-1993 "General  overhead bridge crane " and GB/T14406---1993 "universal  gantry crane   requirement, the new factory bridge, gantry crane girder span camber should be (0.9 / 1000 ~ 1.4/1000) S, and the maximum camber should be controlled across the S / IO range. Our company has years of l0, 106 Taiwan major cities to test bridge crane survey found: Average crane factory camber is S/IO00 (where S is the crane span), the use of a 20% reduction after 1 year, the use of 2 ~ 5 years decreased by 30% to 50%, more than 5 years reduction of 60% or more, the use of l0 years camber disappear, and then began to scratch down below the horizon. Deflection of the main beam on the crane and to what extent it is not allowed to use, currently there is no clearly defined national standards, so testing in a bridge girder gantry crane should attract attention.

First, according to GB6067 - 1985 "crane safety regulations" scrap metal structures Standard No. 4 states: "The main force component due to plastic deformation, so that institutions can not properly working safety
Run-time, if not repaired, should be scrapped. For general overhead crane, when the car is in the mid-span and at the rated load, the lower girder span deflection values   under the horizon, to span 1/700, if not repaired, should be scrapped. "And according to GB381l-l983" Crane design specifications "in the electric single, double girder  bridge crane  type (including gantry cranes and crane) static rigidity provides:" When fully loaded car (or electric hoist) located at midspan, main beam (main truss) As rated lifting load and trolley (or hoist) caused weight across the vertical static deflection l, shall meet the following requirements: working-level A5 or A5 below cranes, Y ≤ S/700 ; working-level A6 cranes, Y ≤ S/800; working-level A7, A8 crane Y ≤ S/IO00; (where S is the crane span). "Can be inferred from the above provisions: ignoring the car weight (or hoist) under the premise of the rated load caused by the main beam deflection values   under the metal structure without exceeding its rated load scrapped due under the main beam deflection values that at this time in the main beam under no-load condition scratch in the security area, or that the state of the main beam under load deflection is in an unsafe area, then they should be rated for the load test equipment to verify whether the main beam should fix the standard, that is for working-level in A5 or A5 below crane, when it reaches the main beam deflection under S/700 a Y = 0, that is under the main beam deflection occurs, it the device should be rated load test to verify whether the main beam should fix the standard; For working-level A6 crane, when it reaches the main beam deflection under .S/700 a Y: S/5600 when rated load of the equipment should experiment to verify whether the main beam should fix the standard; For working-level A7, A8 crane, when it reaches the main beam deflection under S/700 a Y: 3S/7000, then deal with the piece of equipment rated load test to verify whether the main beam should fix standards.

Since crane design and material selection of the different methods and other reasons, the main beam crane static rigidity at rated load deflection caused by the actual values   will be different the next, so that the main beam at no load, the actual deflection values   have been exceeded under the above defined values, but during the rated load experiments, the actual values   may not reach down deflection retirement provisions of the standard metal structure, so this value is only when in use as a bridge girder gantry crane for a rated load experiments reference value, and not as a right in with the bridge, the main beam gantry crane scrapped criteria.

Bridge crane safety trolley line improvements


bridge crane safety trolley line is a new mobile power supply unit, with its insulation, security, temperature, vibration, energy saving and other advantages to gradually replace the old bare angle iron and copper trolley line.

        overhead bridge crane  in use and easy off, sometimes in the transmission conduit sparks some serious blasting trolley line ", resulting collector replaced too frequently, affecting production. Therefore conducted the following improvements:

       (A) increasing the collector brushes chamfered and polished smooth;

       (2) increasing the collector between two opposite brush spring strength, flexibility, ensure spring return freely;

       (3) to deepen. Reinforcement collector in a spring seat, the return spring to ensure the brush is not easy in the work "bit string";

       (4) two safety trolley line connections connecting block should be chamfered to ensure a smooth transition collector. Meanwhile, to ensure the safety of the normal use of the trolley line, driving workers standardize operations, maintenance workers of periodic maintenance, periodic inspection is also essential.

Bridge crane safety inspection project


bridge crane safety inspection in order to ensure the safe operation of the crane during operation must perform some routine security check items and points are as follows:

  1, lifting height limiter, travel limit switch and the interlock mechanism normal performance, safety and reliability.

  2, the main components meet the safety requirements: opening increases less than 15% of the original size, torsional deformation of less than 10%; plate hook bushing wear less than 50% of the original size, plate hook spindle wear less than 5%, no peeling, burrs, welding. Hanger hook and pulley no obvious defects. The surface of the wire rope wear, corrosion is less than 40% of the diameter of the wire, broken wire in a twisting pitch of less than 10% of the total number of wires, no breakage, no thinning, no core prolapse, dead twisting, extrusion , annealing, burning phenomenon. Rope end connections and fixed clamp, plate, wedge block connection intact, no loose, plate no less than two, no less than three clips. Roll no cracks, connections, fixed no loose; cylinder wall wear less than 20% of the original thickness; secure volume of not less than two laps, drum and rope diameter ratio meets the requirements. Balance wheel fixed intact, wire rope shall conform to the requirements. Brakes no cracks, no loose, no serious wear, brake clearance is equal on both sides of the right size, there is sufficient braking force, brake band wear less than 50% of the original thickness.

       Through the  overhead bridge crane  safety routine inspection, to prevent accidents, reduce equipment accidents, improve equipment operation rate, lower maintenance costs etc. played a significant role.

Bridge crane box girder manufacturing

A company has to undertake over a  overhead bridge crane  manufacturing tasks as single girder   gantry crane  span 22In, lifting the quality of 5t. In the absence of large-scale lifting equipment in the case, the use of side edge welding assembly and welding assembly sequence, effective control of welding distortion, box girder solve difficult problems flipping the successful completion of box girder welding to ensure that the technical requirements. Box girder length 361TI, Dimensions: 36000mm ~ l25mm ~ l500mm. By the Q235 welded steel plate, shown in Figure 1. Girder webs and flanges are Class I butt weld seam, the main beam and the web is a combination of Class Ⅱ weld seam; beam camber of 22mm lateral bending ≤ 8mm, twisted ≤ 3mm.
An analysis
Box girder weld quality and require high dimensional accuracy. Section size, rigidity. During the welding process, due to site conditions for lifting the restrictions, unable to box girder repeatedly overturned, only use a reasonable order of assembly and welding deformation control. In the event of deformation after welding can not be corrected, therefore, box girder manufacturing key is to control the manufacturing process in welding deformation.
Girder  bridge crane  requirements in the vertical plane must have some camber. To offset the lower beam deflection when lifting. Arch on value of L/1000, namely 22itlm. Therefore, in the manufacturing process, the use of precast webs arch deformation method to ensure that the main beam camber.

Two manufacturing processes and practices
2.1 welding personnel
Participate welder welding operation should have the appropriate qualifications. In addition. It should also be equipped with specialized technical personnel on-site guidance welding, welding inspection personnel tracking checked.
2-2 welding materials
Electrodes before use must be strictly carried out according to the instructions of the drying. Then placed insulation tube, used with the check. After drying cylinder electrode placed over 4h in the insulation should be re-drying. Drying times shall not exceed 2 times.
2_3 cutting
Automatic cutting flame cutting method.
(A) under the cover material to the upper and lower plate leveler after. Put the butt length of 400mm process margin.
(B) the material web leveler web, the first in the longitudinal direction of the stitching, and the left and right symmetrical cutting the web. On both sides to prevent the main beam webs of different sizes. Cause distortion of the main beam. For there are provisions on the main beam camber in web cutting must have the appropriate camber and camber should be larger than the main beam camber. Web cutting, the need to put 1.5L/1000, ie 33mm margin, and may not have from the center 2ITI at joints, in order to avoid weld concentrated on the lower cover joints should be staggered with the web from not less than 200mm. After cutting the length of the web error _10mm.
(C) the length of the rib cutting the length of the main beam width ribs not only big small (1mm or so). Length dimension may allow a certain degree of error (± 2mm or less). Ribs four corners should be 90. , Especially
Which is on the cover with the coupling ribs at two corners should be strictly kept at right angles to the beam web and the emperor assembly upper cover vertical, while the main beam in the longitudinal direction distortion does not occur.
2.4 Preparation of the groove
Upper and lower cover and web docking forming process can be side welding, bevel angle is 30. ~ 40. , Single-sided V-shaped groove, groove and to reduce post-weld flip workload.
2.5 assemble a welding
2.5.1 assembling a welding sequence
In order to maintain a reasonable girder camber. And effectively control the welding deformation, on the use of prefabricated arch assembly method.
(A) under the cover of the first leveler, then lower cover all the butt weld welding.
(2) the system out on the platform and the web on a consistent camber and lower cover after welding leveling. Tile on the platform, and the mounting position of the boards draw cord.
(3) to the side of the lower fixing point on the cover web, the web and the lower plate taken to ensure the verticality and the draw of the web the location of the partition line.
(4) to draw in the other flanks of the spacer board after position line. And lower cover tack welded together.
(5) the length of the separator and the angle at good position draw lines, respectively, with two webs for tack welded together.
(6) Welding bulkhead with two long vertical slit webs, and the angle fillet with two webs.
(7) assembled on the cover.
(8) under the cover of the first welding of two webs with two longitudinal seam. Welding on the cover again with two webs two longitudinal seam, and finally welded on the cover with the long spacer fillet.
(9) group for the short spacer group after the first weld short vertical separator and two webs seam, then welded on the cover with a short spacer fillet.
2.5.2 Group on clearance
Upper and lower covers and webs in docking, should leave some space, thickness 8mm, gap of 3 4mm, to ensure that the forming side welding. Two webs and lower cover in the group, the group should minimize weld gap. Clearance amount <1.0mm, in order to reduce the welding deformation. Length of the ribs with the upper cover for group, they also should be pressed components, in order to minimize the gap welding team.
2.6 Welding
To ensure the box girder welding quality and reasonable camber, and effective control of the welding deformation. Welding process is critical.
(A) before welding, check the groove and the group of quality, such as the discovery size tolerance. Should be timely treatment after welding.
(2) must be removed before welding and weld groove 20mm wide on each side of the oil, sewage, water, rust and other impurities.
(3) Welding sequence: first welding the upper and lower covers and web butt weld. Then welded two webs and lower cover two longitudinal seam; welding process, should be adopted in two or four welders while welding symmetrically to prevent the main The beams distorted.
(4) reasonable selection of welding parameters: welding method using SMAW, electrode diameter is 4.0mm, the welding current is 160 ~ 200A, arc voltage is 22 ~ 25V.
2.7 Quality Inspection
Box girder quality inspection is mainly in the manufacturing process and the manufacturing process inspection after completion of special inspection. Box girder welding is completed, the joint inspection by the quality inspection department, its geometry, camber and weld quality are in line with quality requirements.

3 Conclusions
For this large bridge box girder cranes, lifting equipment that do not have a large case, the author uses reasonable assembly and welding sequence and process measures, successfully compensate for the shortage of equipment, to avoid repeated for box girder flip, guaranteed box girder welding quality and meet the size requirements.