The method of choosing an electric crane hoisted What?

Select electric suspension  gantry crane  is there are many, and is now in the process of using them often will notice the quality of electric overhead crane, and in ensuring quality problem is not a big problem under the premise can be use, and generally like the same kind of product is more useful, so now people are more like them, then when the electric machinery enterprises in the choice of crane hoisted what way to do it?
1.Brand
Typically, in the choice of machinery products in the process is the need to look at their product brand image, often a lot of plastic products, established brand image is not very good, so people in the choice of the time its not very satisfied with the choice, in fact the difficulty is relatively large, when the electric overhead crane products gradually increased, the customer is also a troublesome thing, in the course of its production brand is more critical, so when choosing an electric overhead  bridge gantry crane  brand is more important.
(2) the role of
As this electric crane hoisted it on the market must have a significant role, and in the process used to carry out the role which can well be reflected, this role is the ability to be a good show out , so in the process of choosing an electric  bridge crane  is important to note these.

Electric double beam crane how developed?

Now on the market role of the electric double girder  Steel crane  is relatively large, it uses a dual beam material, generally single beam, so it is a little bit special products for this product is relatively in need because such products on the market is relatively rare, so use them when are generally more careful, because extend the life of the other, which is quite good, and now electric double girder crane is mainly how developed it?
1 Product Updates
When the electric double girder crane in the process of development is the need to constantly update their products, and only in its case constantly updated in order to better display quality products in its production process often products is relatively high, and now he's more concerned about the development of the market, but also have a lot of machinery is relatively optimistic about its business in the development process of their continued support and help, and product updates only a part.
(2) quality assurance
Now, with the electric double girder  bridge crane  continues to develop, in terms of quality has Nana fill a good guarantee, as long as there are points to ensure users will use them more confidence, which is the product during development process a little more attention, but in terms of quality is more valued.
This is the electric double girder  hoist gantry crane  on the market gradually developed factor.

Crane safety working conditions

To ensure the safety of the crane work,  bridge crane  design should meet the following three basic requirements:

First, the metal structure and mechanical parts should have sufficient strength, stiffness and flexural capability.

First asked Crane parts and metal structures under load does not destroy, that is to meet the strength requirements. Static strength calculation is the most basic calculations. Stresses the importance of general circulation or fewer parts, only for static strength calculation. Parts or components subjected to cyclic stresses, in addition to fatigue calculation, but also should be the peak load for static strength calculation. For complex stress state and other parts of wire rope, in order to simplify the calculation, usually only by major load, mainly deformed shape, a higher safety factor for static strength calculation.

But alone is not always guaranteed to work damage, such as by an excessive load deformation member will also affect the normal operation. Therefore, you must also request loads, components produced by deformation should be within the allowable range, that with proper rigidity.

Slender rod suddenly bent or pressed steel structures localized buckling in statically determinate structures may result in variable geometry structure. Its original equilibrium state becomes unstable equilibrium, so that the failure of structural parts and components, it will also result in the destruction of the  hoist gantry crane ,  thus satisfying the requirement to meet the stability is also very important.

Second, the machine must have the necessary stability against overturning.

Third, the former winter has to meet the requirements of the job performance power brakes provide the necessary braking torque.

Determine the characteristics of the crane's work load randomness, while the  bridge gantry crane  is used in deterministic approach, so for complex changes in actual load, only with simple theoretical calculations and experiments and experiences combined calculation to determine by knowledge thus obtained approximate actual load, often called load calculation.

General safety check hoist drum

Rope hoist drum by pressing action, but also by causing the bending and torsion wire effect,bridge gantry crane and plays a major role in extrusion. Cracks have occurred since the roll, the roll indentation rope accident, so check out the drum have cracks should be scrapped, the spool shaft by bending and shear stresses, should be discarded if cracks are found, otherwise there accidents can happen off-axis; reel rope groove wear depth should not exceed 2mm, when more than can be re-grooving, but roll wall thickness of not less than 80% of the original; wheel up and down without cracks, screw on connections to tighten.

Wire rope on the drum groove wandering off overhaul, when the wire rope groove angle is relatively large, the rope will wear groove edges or even quit, causing severe rope wear. For relatively rope wire rope groove drum grooves to allow deflection of 4 ~ 5 °, when more than 6 °,hoist gantry crane the rope may quit, the general common cause is a hook pulley from the roll distance is too small, then do the appropriate adjustments. May be due to the drum pulley hook skew safe position, may have inclined deflection caused by the goods leaving the rope hanging quit.

In addition, new for wire rope, if twisted rope wrapped around the roll stiffness (due to roll on the wooden prehensile) did not relax, but also make rope quit, and even crossing a rope pulley correct together, in order to prevent the accident, you can put suspended by rope into a disk gradually liberalized straightened,bridge crane twisting stiffness can be completely gone.

China Heavy Machinery Industry overall development

China's heavy machinery industry,bridge crane with the founding of New China gradually developed since the founding of the heavy machinery industry has achieved a number of major technical equipment in China. Heavy machinery industry is not only highly valued by the state, has become China's mining, energy development, raw materials and other basic industries, and large casting and forging strong localization of major equipment pillar. At present, large-scale heavy machinery enterprises have the ability to provide an annual output of 2,000 tons of mine, an annual output of 60-70 tons of metal ore, annual output of 500 tons of underground coal mine, process 300 tons of coal preparation plant, a single series annual processing capacity of 300 tons of plant and other necessary equipment, and annual output of 600 tons of iron and steel enterprises with conventional process equipment. According to China Heavy Machinery Industry Association, the division of the heavy machinery industry is divided into sub-sectors of metallurgical and mining machinery and material handling equipment sub-sectors.hoist gantry crane The company belongs to the heavy machinery industry in the metallurgical and mining machinery sub-sectors.
2003-2009, in the mining, metallurgical and other downstream industries continued growth in fixed asset investment driven, metallurgical and mining machinery sub-sector achieved sales revenue compound annual growth rate of 38%, higher than the material handling machinery sub-sector average growth rate of 28%, driving heavy machinery industry grew 32%. 2010, China's heavy machinery industry, the situation is generally good, the industrial output value increased by 25%, industrial sales output value increased by 24.4%.
2011 January to November, the heavy machinery industry overall industrial output grew 26.34%, industrial sales output value increased by 27.22% "Twelve Five" period, the heavy machinery industry trends based on relevant national long-term development plan as a guide, aiming at the international advanced heavy industries, using information technology to promote industrialization, the transformation of traditional industries, to adjust the industrial structure and technological enterprise organizational structure, promote industrial restructuring and technological upgrading; focusing on key construction projects, enhance the comprehensive technical capabilities; strengthen independent innovation, accelerate the formation of independent technology,bridge gantry crane independent standards and independent brands; cultivate the development of strategic emerging industries, promote the formation of new competitive advantages and new economic growth point, to improve the overall level of equipment manufacturing industry.

Lifting machinery industry in 2015 is expected to pick up a full recovery

Lifting machinery industry in China has experienced nearly a decade "blowout" type of development, the whole industry has entered a production contract, revenue fell cycles. China  bridge gantry crane  CEO, industry analyst Yangshu Yan said: "In fact, starting in 2010, the industry has begun crane shot down, and gradually into a low-profit era, to the winter of 2012, the industry has come."
2013 lifting machinery industry growth slowed further, many crane companies in the homogenization of serious competitive environment difficult. Lifting industry in China has a "barometer" of the Chinese crane hometown in Henan Province Changyuan, past busy, machines roaring situation no longer exists, lack of factory orders, production team layoffs have become a common phenomenon industry . Funding strand breaks is very difficult for many companies in the brink of life and death. 2013 a quarter of the entire industry output profits fell nearly 60%.
Yang Shuyan analysis that led to the first quarter of 2013, corporate sales and revenue both fell mainly due to weak industry demand, but in the back of weak demand, not just domestic fixed asset investment growth and a decline in the real estate market five new national policy impact, but also the entire country in 2012 a continuation of the equipment manufacturing industry downturn.
hoist gantry crane industry over the last golden years, gave birth to the rise of a number of leading enterprises, but the excessive pursuit of speed and scale also resulted in overcapacity, irrational structure, product homogeneity, etc. invisible injury, this situation is growing stagnant 2012 annual performance is very obvious to the industry caused a lot of pressure. Enter 2013 in the enterprise revenue decline, the market demand slowdown Yan Chun situation, Changyuan also from the government level, the use of the visible hand pushing business strategic restructuring, guide enterprises to adjust product structure, promote the healthy development of the whole industry a reasonable .
In fact, some industry experts are not optimistic about the crane industry placanticline internal reorganization, because different companies kneaded together, sheer scale merger may not be able to achieve optimal results. Large enterprises and groups requires companies endogenous development and growth, rather than a simple merger and reorganization. For the entire industry, lifting, walking industrial upgrading, product upgrading, technological innovation, marketing model innovation is stronger placanticline crane industry and the country's key.
In the context of global economic restructuring, lifting machinery industry development trend of slowdown is inevitable. China's manufacturing purchasing managers index (PMI) 2013 year April index was 50.6, down 0.30%, which we analysts believe the industry is still in the stage of stabilization row irresolute. At what time it comes to  bridge crane  can really pick up when Yangshu Yan analysis, the future lies in integration and opportunities for more innovative marketing model. At present, the Chinese crane industry is still relatively extensive mode of development, technological innovation capability is weak, low value-added products, the overall big but not strong, the real recovery in the industry should be in the end of 2015.
How quickly achieve industrial transformation and upgrading, smoothly through the downturn adjustment period? How in the future market competition in the next round to seize the high ground, the entire  hoist crane  in the future development process need to solve the primary problem. "

Second half of the construction machinery and accessories industry, or will usher in a great political situation stable growth

Into July, the construction machinery industry is finally over the first half, "volatile" situation, the industry sources said the current stage of rapid growth to stable growth from the "growing pains" that is, the beginning of the second half, engineering  gantry crane  and accessories industry or will usher in a golden political situation stable growth. But expectations are always good, as has been chanted since the beginning of the "recovery" as the specific market situation is such prophecies wish, on the dawn of the unknown. How to make good use of construction machinery parts in the second half of the various policies and market opportunities, is the urgent problem.

Although the first half, the construction machinery industry several major economic indicators showed a negative number, 1-May, most of the products engineering machinery production has continued to decline. Dig earth moving machinery, excavators and loaders decreased production increased more than 5%. However, compaction  bridge gantry crane  production rose slightly, up 3.5 percent, down 8.23 percentage points from the previous month. Compared to the previous month, data, production decline was slight improvement.

But the dismal data, and did not affect the industry's confidence on the road to recovery. Association believes that the current development trend of the construction machinery industry is robust. Although the industry is difficult to return to the previous high level of growth in 2011, but the ups and downs of the phenomenon will be rare in the future, steady state growth policies will gradually pull (such as shantytowns, etc.), the situation is still optimistic about the industry as a whole will show steady sustainable development trend.

Even if the development of the industry as experts said, the construction machinery industry is still in a rising channel, but if companies can not focus on solving key parts of the development, then certainly by others. In the complex market environment in the face of fierce competition in the market,  bridge crane  parts enterprises should actively seek new ways to find new ways to seize the opportunity.

In addition, the State Council executive meeting held recently pointed out, research, deployment, accelerate the transformation of squatter settlements is one of the new urbanization is expected to leveraging the 300 billion yuan investment market, which will help promote the construction machinery industry to achieve warmer.

Crane Safety Precautions trolley line

  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.
       bridge gantry 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,hoist gantry crane 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,bridge crane periodic inspection is also essential.

Construction machinery crane operation details

Construction machinery  bridge crane  is one of the more common models. Hydraulic cranes are generally powered with various hydraulic devices. Operation should pay attention to safety when lifting operation the following precautions:
A crane manufacturers reminder: before the operations, shall determine the hydraulic oil tank level window, whether the requirement to add a little less than the prescribed engraved line, it must be supplemented. Come on, be sure to filter through fuel injection, and very careful not to sneak into different grades of oil or water impure character.
2, the filter cartridge after 250h at work, should be checked, if necessary, cleaned or replaced.
3, the hydraulic oil tank should be every two weeks from the bottom drain port clear water and impurities once, and replacing all the hydraulic oil every year. Environment, especially when the bridge gantry crane  in use when operating under adverse conditions, the oil change interval should be shortened accordingly.
4, various valves in the hydraulic system has been adequately tested before leaving the factory, and has adjusted the pressure and flow, must not casually touch.
5, various parts, in particular a hydraulic system, each device are attached to avoid dirt. After the job,gantry crane must take the dust, oil removed.

Tan Chinese crane rental market

As a lifting people, I have witnessed and experienced the Chinese  bridge crane  business in recent years of rapid development, and feel proud of. Especially in the unit regularly works with colleagues discuss lifting program, my colleagues with surprised eyes listening to us about the development of the domestic crane, crane rental companies as more of a person in charge of the glory and responsibility.

In recent years, the rapid development of Chinese crane manufacturing industry, China crane rental market is also rapid growth, I like to use a leased corporate identity on the Chinese  hoist gantry crane  rental market situation and future development need to address several issues to discuss with you.

I believe that the current pattern of the world is still the crane manufacturing powerhouse Germany and the United States and Japan has not changed, except change is already a manufacturing power of China and to the power forward. The crane rental market in recent years, the rapid development of the Chinese  bridge gantry crane  manufacturing industry to promote this change, that change would effectively promote the rapid development of the cause of national construction.

Lifting machinery safety supervision of the basis for a new

Since 2007, special equipment safety situation is grim, despite the number of deaths from all kinds of accidents has declined, but special equipment, the number of accidents over last year increased by 20%, in particular  bridge crane  accidents continued to show a high trend, major accidents have occurred, 1 to 4 months of serious accidents over 25, the death of 23 people, respectively, over the same period last year increased by 47% and 53%.

In view of this situation, from June 1 onwards, China has a new crane safety regulatory basis. Following the AQSIQ announced the "supervision and management of boiler and pressure vessel manufacturing," the "gas cylinder safety monitoring requirements," "special equipment operator supervision and management measures", the first four and the "Regulations on Safety Supervision of Special Equipment" complementary regulations. "  overhead bridge crane  safety monitoring requirements, "begun.

Reporters recently interviewed AQSIQ Special Equipment Safety Supervision Bureau official, according to the parties, this requirement is divided into General, lifting machinery, lifting machinery installation renovation repair and lifting machinery use, supervision and inspection, legal liability and supplementary provisions of Chapter 7 46. The "crane safety monitoring requirements"bridge gantry crane in the "Special Equipment Safety Supervision Regulations" within the framework of a total of at least 12 detailed content.

How to check the crane hook

Crane hook assembly as shown in drawings, the main by a pulley, pulley shaft 2, anti-decoupling device 3, leptospirosis 4, beams 5, bearing 6, the combination of bolts 7, round nut 8, 9 and plywood guidewire block 10 and other components. To ensure the normal use of the  bridge crane  hook, crane operators, maintenance personnel, as appropriate, to carry out security checks on these parts, check the contents include three: First, check the technical documents, two is to check the appearance and surface cracks, three is a measure of the amount of wear, opening degree, reversing the deformation and so on.

1 matching technical documents

Put into use before the new crane, the operator should check the hook assembly relevant technical documentation. Signs which hook assembly of the standard load rating should be consistent with the actual lifting loads, the related technical documentation and factory certification should be complete.
2. Visual inspection

The operator has the appearance of each hook assembly should be checked, each component requires the following: 1 pulley shaft 2 to rotate the pulley should be flexible, no looseness; pulley rim 1 should be no breakage or crack, or should be replaced ; Anti-decoupling device 3 should open and close freely, the spring should be intact, in order to prevent the rope from slipping off the hook body 4; leptospirosis four bearings in the beam 5 6 should be flexible rotation; round nut 7 and 8 can not be combined with loose bolts .

3. Check the hook surface cracks

First with kerosene Leptospira 4, and then 20 times magnifying glass to check whether there are cracks leptospirosis, coloring method used when necessary testing. For large-tonnage  hoist crane  hook, but also using non-destructive testing method (magnetic testing, ultrasonic testing) check hook inside and outside the presence of cracks. Such as leptospirosis four surface and internal cracks should be replaced immediately.

4. Measurement geometry leptospirosis

(1) Wear

Conducting periodic inspection crane should be used when measuring calipers caliper or wear surface leptospirosis 4 the amount of wear. If a larger cross-section wear its force reached 10% of the original size should be replaced. Crane overhaul, respond hook assembly for dismantling and measure pulley shaft 2, beams 5, 6 and plywood 10 shaft bearing bore wear. When the wear reaches 5% of the original size, it should be replaced.

(2) the degree of opening

Leptospira four openings measuring method is as follows: According to the hook on the label of the rated load for load test, the load incrementally and gradually increase to 1.25 times the rated load, lifting time of less than 10min. Measured with a caliper after unloading hook opening degree, the value is compared with the original opening size, the opening degree of the increase should not exceed 0.25%.

When the opening of the new hook, the hook body 4 can punch on each side of the opening punch a mark, the measured distance between the marks 2 and the opening size of the original recording.hoist gantry crane If the degree of deformation of leptospirosis four openings than the original 15% increase in the degree of opening, should be replaced.

(3) torsional deformation

Inspection Leptospira four torsional deformation measurement methods are as follows: the side with a ruler positioned against the side of the shank 4, view check ruler with leptospirosis four sides of the gap. If leptospirosis four different sides of the gap, indicating leptospirosis four torsion deformation. For accurate measurement of the torsional deformation of leptospirosis 4, it can be disassembled with crossed feet on the platform testing. Leptospira four torsion over10 ° should be replaced.

2012 crane sales worth the wait

    December sales were slightly down, up sharply creating high base truck cranes up sharply. According to China Construction Machinery Trade Statistics, December 2011 14 major automobile manufacturers were sold crane truck crane 2007 units, down 37.83%, the chain fell 8.15 percent.bridge crane January-December total sales of 35,460 units, an increase of 0.10%. Month truck crane sales less the previous month, but the 10-year high in December cardinality problem, fell by a big margin. With the 2012 recovery of railway infrastructure, as well as the relative improvement in the credit environment, we expect sales will gradually bottom out crane.
     Crawler crane growth high. December 2011 seven major manufacturer of crawler cranes, crawler cranes 173 units sold, an increase of 46.61%, growth of 24.46%. Cumulative sales from January to December 1916, an increase of 9.49%. Crawler Crane last two months has been the steady rise this month is to achieve high growth year on year.
    Industry concentration rose slightly.hoist gantry crane 2011 January-December, four major car brands total sales of 32,711 units cranes, accounting for 92.25%; 3 large crawler crane cumulative sales of 1293 units listed companies, accounting for 67.48%; 3 large crane brands total sales of 7,409 units, accounting for 90.29%; respectively, and 2010 full-year 89.47%, 62.06%, 83.57% of the market share increased slightly, indicating an upward trend in market concentration crane.
     Truck cranes and crawler crane product mix in favor of large-scale products. Overall, truck cranes and crawler crane product mix to the large tilt, 1 to 19.9 tons, and 20 to 29.9 tons truck crane products are still the main products, but in recent months accounted for more than 30 tons products significantly enhance; a -70 tons crawler crane products are still the main products, but beginning in March, more than 200 tons crawler crane overall proportion upward trend.
     SMEs tend crane product structure.bridge gantry crane In recent months, the overall bias crane product structure of the main products under 10 tons, 10 tons and above accounted for since March as a whole showed a slight downward trend.

State regulation lifting construction of national key construction projects

Production Safety Commission Office of the State Council recently issued a circular that is focused on solving the construction cranes, scaffolding collapse accident-prone, frequent problems, eot crane effectively prevent and resolutely curb serious accidents, decided this year to April to December, in the construction areas of prevention construction cranes, scaffolding collapse special rectification work.
    An commissioned issued special rectification program that focuses on the special rectification are: housing and public works, industry, railways, highways, electricity (including nuclear power) and water (including the South) and other construction projects, especially national key construction projects, the provincial key investment and development projects, and real estate development projects, affordable housing and urban rail transit construction and other projects.
    Notice that the special rectification of the key elements include: Construction Project site uses various types of lifting machinery, including gantry cranes, bridge machines, bridge crane especially the tower crane collapsed, falling accident, as well as tower crane installation, demolition process in a variety of hazards and accidents; construction projects and construction sites on which various types of scaffolding, especially stents, scaffolding support system collapse, including any pipe material, the use of various types of templates triggered collapse.
    The circular emphasizes that the main responsibility to implement the enterprise, strengthen construction safety supervision and management; regulate the construction market order, crack down on illegal construction violations, to crack down on qualifications beyond the scope of contract works, construction companies no relevant qualification certificates, illegal subcontracting, subcontracting and other illegal activities; strengthen grass-roots infrastructure, enhance security capabilities construction; strengthen the construction site management, improve the level of safety in production of construction enterprises; strengthen scientific and technological support, and actively promote the construction of advanced and applicable technologies.
    The circular pointed out, through special training to effectively prevent the construction field construction cranes, scaffolding collapse, further reducing the total accidents, efforts to achieve year 2012 construction field construction cranes, scaffolding collapse the number of accidents and deaths up decreased,hoist crane a larger decline in the number of accidents is not less than 3.2% of the target, to prevent the occurrence of major accidents.
    Notification requirements, from May to September this year to carry out self-examination and self-correction, October to mid-November on the key areas, key enterprises and key projects to conduct random checks.

Construction crane danger caused by factors

By analyzing the following main reasons:
     1, special equipment manufacturing license terms
     In some places because of the quality and technical supervision departments relevant laws and regulations recognize different;hoist crane implementation of strict, so that some do not meet the requirements of the lifting machinery and equipment manufacturing enterprises achieved a "special equipment manufacturing license", leading to some unqualified products into the rental market.
     2, special equipment manufacturing supervision and inspection of
     Lifting machinery manufacturing enterprises producing devices can not achieve 100% detection rate, resulting in some mechanical equipment factory have failed to obtain a "product certification" and "special equipment manufacturing supervision and inspection certificate."
     3, the production technology
     At present, China's production of construction lifting equipment company, with a tower  Steel crane  self-development capacity, very few companies, mostly using imported equipment production technology tower crane drawings, but for some structures, institutions had to change, because the original tower crane design drawings of the core technology to understand, there is a deviation on digestion; substitution of materials, manufacturing processes, tooling manufacturing, design improvements, technical capabilities are not designed to support the unit, resulting in some construction crane equipment in production technology to a security risk.
From the above causes manufacturers of products have quality problems caused by industrial accidents.bridge crane By 1990, the country's 128 since starting construction crane responsibility for production safety accident analysis, accident six due to quality problems, accounting for 4.7%.

Marine deck cranes and other machinery future technology trends

With the shipping industry on the ship economy, reliability, environmental protection and other aspects of requirements continue to increase, the world's ship is accelerating to the large, intelligent, low-carbon and other direction. Marine equipment is to achieve an important carrier ship performance. To meet the development requirements of marine technology,bridge crane world-renowned deck machinery manufacturers have committed to energy saving, large-scale, modular, intelligent equipment research and development, and has become the leading future trends.
Energy saving
Compared with the hydraulic deck machinery, electric deck machinery with no hydraulic oil, low noise, low power consumption and other advantages, meet the energy requirements of environmental protection has become the development direction of deck machinery technology. Finnish Cargotec Corporation raised its current R & D focus is to reduce the energy consumption of the product life cycle, providing environmentally friendly solutions. Currently, the company is committed to electric gangway, electric deck cranes,bridge gantry crane electric hatch cover drives, electric winch, as well as bulk carriers fully enclosed dust from unloading system development.
Large-scale
With the ship towards the large-scale direction, ship loading capacity to meet the requirements of large-scale marine cranes gradually. Meanwhile, the steering gear, anchor windlass are moving in the direction of the power of large-scale development. 2011, Cargotec Corporation is the world's largest and most advanced offshore construction vessel "Sea Giant" sign manufacture and installation of a Taiwan 400 tons MacGregor brand semi-active heave compensated cranes.
Modular
HATLAPA company, Rolls-Royce and other deck machinery uses a modular design and production patterns, which not only help to reduce production costs, improve product quality and stability, and also contribute to the mass production of products, installation and maintenance.
Intelligent
Microelectronics digital technology widely used, greatly improving the operational control of deck machinery automation,jib crane intelligence level, degree of centralized control and remote control a substantial increase, make the operation more convenient and safe.

Planned maintenance overhead crane

Scheduled maintenance  overhead bridge crane  is the date specified in the plan within the crane for maintenance and repair. Its purpose is to prevent the crane from excessive wear or accidental damage, promptly eliminate hidden equipment to enable the crane often in good technical condition, to ensure the safe operation of the crane, to stop in the shortest possible time and maintenance costs minimally crane maintenance work done in order to achieve increase savings and reduce costs. Planned maintenance can be divided according to conventional small repair, repair, overhaul.

1 small repairs
Minor repairs in the organization's mission is to exclude the operation and maintenance of the fault found by the mechanical repair and replacement parts to restore normal operation. Minor repairs are local repairs, spending a short time, what a bad repair anything, its maintenance should include: the whole  overhead gantry crane  rotating part of the mechanical and electrical equipment parts and metal structural parts to conduct a comprehensive inspection.

For all lubrication points according to their lubrication cycle for cleaning, oil lubrication.

Overhauling of individual parts, replacement or repair.

Certain electrical components for repair or replacement.

For electrical and mechanical parts have broken the trend, the content should be as predictable repair technical preparation work so that in the next cycle repair processing.

(2) the repair
The repair is partially decomposed crane, repair, or replacement of worn parts, crane geometry correction and precision, keeping the crane process performance. In addition to its maintenance content includes the entire contents of minor repairs, but also includes:

Work frequently load large electromechanical components dismantling, cleaning, repair or replacement and lubrication.

According to plan on the technical preparation of the electro-mechanical components to be replaced.

Electrical wiring of the bridge gantry crane  to conduct a comprehensive inspection, replacement of some aging wiring and damaged electrical components.

3 Overhaul
Overhaul is all disintegrated, checking each component disassembly, repair repairable parts, replacement parts or individual can not repair parts, requiring crane overhaul at or near the factory with the technical standards and mechanical properties. Its maintenance should include:

All part of the body decomposed bodies, including reducer, coupling, drum set, wheel set and extract device and other components, replace damaged and had to be scrapped for parts, re-assembly after cleaning and lubrication, replacement wire rope , agencies brake and open the unit.

The motor should be decentralized agencies, drying, assembly and lubrication, replacement of badly damaged motors. Replacement brake opening device agencies; replace damaged bodies cam controller; protection cabinet overhaul or replacement protection cabinet; replace all line connections, re-wiring installation; replacement lighting signaling system control board.

Metal structural parts, right down deflection has occurred or lateral bending of the main beam is corrected repaired and reinforced; All of the entire crane clean and painted two times to protect them.

The overhaul of the  bridge crane  to be debugged, and then press the static and dynamic load test procedures for identification, after passing into production use.

On the countermeasures inclined tower crane

Because lead to uneven settlement of foundation tilt tower machine phenomena have occurred, does not meet the 4 ‰ verticality of the tower crane safety requirements, such as my company site QT60 a tower crane, lifting height of 40m, the concrete foundation of 5m × 5m × 1.3m,bridge gantry crane its quality Fh is 81.3t. In the non-working state, M = 218.3tm; Fh = 7.8t; Fυ = 108t. Some of its foundation backfill the south, due to heavy rain led to uneven settlement occurs based on measurable at 35m height, tilt to the south side of the 315mm.
      An initial stage of the tower crane tilt safety measures
Tower crane tilted vertical exceeds 4 ‰ safety requirements, they should immediately stop using it. Calculate the tower in the most unfavorable condition (non-operating state), the measurable height, to ensure the tower from tipping machine does the critical maximum inclination amount L. Note that regular observation tower machine tilt speed and the amount of tilt, and make a record. Once you reach the amount of tilt 0.5L, and continues to tilt, you need to take drastic measures such as demolition of the tower.
If the tower crane temporarily can not stop using it immediately, and the deflection of not more than 0.25L, you can take the following safety measures.
      1) based on the increase in the pressure of heavy concrete blocks (tilted in the opposite direction in the appropriate place some more),overhead gantry crane increase in base quality, lower center of gravity height and reduced tower crane e values.
      2) in the appropriate tower height position, additional devices attached to the wall.
      3) In the tower proper height position setting wind cable wire, to prevent tilting tower crane continue.
      2 tower crane tilt correction
Tilt tower machine stopped, in order to return to the verticality of the tower crane within 4 ‰, meet the safety requirements, it would take on the tower crane for correction.
      2.1 Corrective Steps
      A) the use of the principle of similar triangles to calculate the legs of the tower plus the required thickness of the pad.
      2) based on cross-sectional shape of the legs, on the need to top up the two legs to prepare six dimensions slightly larger than the cross-sectional shape of the contour gasket which four thick 6mm, 2 slice thickness of 1.5mm. As can be easily inserted into the gasket to the standard sections and between the legs, each piece can be broken down into four parts washer, Figure 1.
      3) Production lifting iron shoes shown in Figure 2. Iron shoes should be negative for lifting loads without deformation, can be easily mounted on a main limb in the standard section and the section with the standard can provide enough friction.
      4) Adjust the position or lifting the car horn a certain amount of load, so that the tower  bridge crane  balance, to ensure four legs under pressure.
      5) to be installed in the iron shoes of a standard section padded main limb on the standard section bolts loosen a pad thick (6mm) amount of clearance. Loosen both legs advances need to add another bolt, the bolt prestress neither, nor the amount of backlash.

      6) skid pad with a good jack, slowly lifting until the standard section and support legs appear 6mm gap amount, stuffed one (Figure 1, 1,2,3,4 of 4 parts) gaskets, this When the bolt should be no pre-stressed, no margin.
      7) Install the iron shoes to be added to the other side of the main limb pads standard section, and with the skid pad is good jacks, loosen the bolts to a 13.5mm amount of clearance, slowly lifting jacks until the standard section appears 13.5mm When the amount of backlash, into the three pads (6mm, 6mm, 1.5mm). At this point there should be no pre-stressed bolts, no margin.
      8) the iron shoes to install in the first section of the main criteria jacking limb, and add the remaining two spacers (6mm, 1.5mm).
      9) will have two legs padded bolts tightened to the specified preload, and then release the other side of the two legs one by one bolt, legs and if the gap between standard section appears, press Padded amount of backlash after the bolt is good.

Decades of continuous development of the scale of construction crane industry

Works in the field of construction machinery  Steel crane  industry maintained a rapid pace of development, the performance of the product gradually cover the upgrading, technological innovation and product technology content increased, leading enterprises continued strength and so on.
The accelerating pace of international development: international and domestic brands competing against the phenomenon of corporate mergers and re-evident, sole proprietorship, joint venture, joint stock company and other economic forms coexist economy to the crane industry has brought new vitality and challenges.
Manufacturers and products quickly escalated: the production and new products as a symbol gradually strengthened. All-terrain eot crane  and crawler cranes constantly refresh the tonnage records, business investment to expand manufacturing capacity has been increasing, a large construction crane development trend more apparent.
Product market sales continue to grow year after year: the market size is growing, international and domestic demand continues to increase in all regions. Crawler cranes rely on imports of basic reversing the situation, the strong growth momentum all terrain crane, lorry crane market is broad space for development.
10 years, construction cranes product sales year after year, the market is expanding, non-automotive  bridge crane  strong growth momentum, China's construction crane market with outstanding performance attracted worldwide attention.

A Brief History of Cranes

  Chinese ancient irrigation is used shadoof jib crane prototype. 14th century, Western Europe appear human and animal power driven rotating jib crane. Early 19th century, the emergence of  bridge crane ,  crane important wear parts such as shafts, gears and began to use metal spreader and other materials, and began to use hydraulic drives. Late 19th century, steam-driven crane gradually replaced the hydraulic-driven cranes. 1920s onward, due to the electrical industry and the rapid development of the internal combustion engine industry to electric motors or internal combustion power plant various cranes basically formed.
Classification
     Usually structured into  jib crane   and bridge cranes. ① jib crane (Figure 1): including tower cranes, portal cranes, floating cranes, self-propelled cranes, composed by the mast and jib mast cranes, wall run along the wall line of cranes and loaded on the deck of the ship deck cranes. ② bridge crane (Figure 2): including overhead cranes,  hoist crane  , bridge and cable crane carrying (carrying cable instead of using the bridge) and so on.