Bridge ( door ) cranes

Currently, the crane must be tested by using the register be put into use after passing . During the inspection the bridge ( the door ) cranes , the main beam and the amount of camber main bridge gantry crane beam deflection measurement set is an indispensable element . Main beam camber measurement method , mainly water level measurements , pull wire ( Amendment) Act and laser straight line method measured deflection mainly theodolite , laser range finder , etc. ; due to different inspectors for camber and understanding different deflection , although the same measurement method , measurement point but full of tricks, with mixed results . Not standardized measurement method , camber and deflection values ??measured on the test and determine whether the crane girder qualified meaningless. In order to eot crane measure the value of camber and deflection can truly reflect the bridge ( the door) as an indicator crane girder situation , we must design intent , analyze measurement and evaluation standards . The purpose of the bridge and making the definition of a camber camber and deflection ( door ) crane main beam camber (F) is the main beam prefabricated by the horizontal line , counting the amount of upward arch . Deflection refers to the rated load in the main beam under the car , the elastic deformation of the main beam generated span down counting from the actual position of the front loading .

Systematic study of two dimensional overhead crane control algorithm

Three-dimensional overhead crane as an important vehicle , widely used in ports , construction sites and other overhead gantry crane industrial sites, the design of its automatic control system security is important for improving production efficiency and production. In addition , three cable car system is - typical under- drive system to study the control problem also has important theoretical and research results can be extended to a class of under- drive system control applications. This paper studies the three-dimensional overhead crane positioning control system and anti- sway control , the main work is divided into the following sections: a detailed study of the actual three-dimensional physical model of the bridge gantry crane crane , and learn from at home and abroad for the crane system modeling research , the use of Lagrangian method , a nonlinear dynamic model of a three-dimensional crane , the equilibrium point linearization been linearized model . Due to the advantages of sliding mode control with strong robustness , we use sliding mode control approach to designing a crane controller, but ordinary sliding chattering problem exists , so a dynamic sliding mode method to weaken the chattering . This paper presents a dynamic sliding mode controller , and the Simulink simulation and virtual reality simulation to verify the feasibility of the algorithm. Design of variable universe adaptive fuzzy controller , and the Simulink simulation results show that the controller makes the crane fast and accurate positioning.

Deformation Analysis bridge , gantry crane girder deflection under

Bridge , gantry crane under torsion beam deformation main cause analysis Chengdu Railway Administration Cheng Guanghui Digest analyzed under the bridge , gantry crane girder torsion deformation reasons , elaborated on the impact of the flexible use of performance bridge gantry crane under the crane girder, and made Some methods to prevent deformation of the main beam deflection . Keywords bridge , gantry crane girder bridge deflection analysis , the torsion of its performance under the girder gantry crane will be greatly affected . Bureau ubiquitous bridge , gantry crane chassis flex phenomenon shaped structure under the main beam , main beam deflection under some very serious , affecting the normal use of cranes and endanger the safety of production . A main beam deflection deformation cause analysis under the bridge , because overhead gantry crane scratching under the girder gantry crane is multifaceted, depending on the specific situation should be analyzed , in general, are the following : the impact of irrational design standards of the old days of the Soviet Union , all according to the degree of master Liang Jinggang L/700 design ( where L is the crane span ) , and not for fatigue calculations. Since the one-sided pursuit of lightweight, small size main beam section , the web is thin, poor rigidity , so that the main beam torsion deformation under premature . Our new design specification , the work level of Crane A6 degree L/800, A7, A8 is L/1000, so that to achieve the standard of advanced countries .

A new gantry crane wind brakes

In this paper, after transformation with a long stroke solenoid brake blocks instead of the gantry crane traveling mechanism in two short stroke solenoid brake blocks are used to complete the traditional functions . One of the problems raised gantry crane vulnerable when the storm struck in open space operations, especially in the coastal areas, overhead gantry crane could easily lead to a major accident gantry crane derailment , overturning and other equipment. Therefore, we must increase the gantry crane carts braking torque , the use of sliding friction between the rails and the wheels to prevent the crane was working by the sudden large wind run . Currently, the double brake commonly used as a brake operating condition of the wind , one brake is a normal working state of the brake , the brake of the other brake wind , shown in Figure 1 . Because the dual brake brake motors were bridge gantry crane installed in a dual- axis , making the structure and control circuits are more complex, the cost increase, to the use and maintenance of both inconvenience. If two brake with a brake operation to complete some of these problems can be avoided . Second, the solution of a long-stroke brake blocks, i.e., the braking torque by the braking torque and the two electromagnets , the main brake spring lever system for generating braking torque generated components. If on the basis of the standard long stroke brake blocks on .

hoist crane safety inspection items and requirements

At present , electrical hoist the domestic electric hoist security, maintenance, inspection items and standards system has not yet been made. I learn from the project and standards for electric hoist security checks abroad , combined with domestic styling products currently in the use of CD-type electric hoist , maintenance and repair issues that arise , try to write this article, the reference for the person concerned , and further improvements, increased to improve . CD -made electric hoist basic performance bridge gantry crane are: starting weight of 0.5 to 10 tons , lifting height of 6 to 30 m , lifting speed of 8 m / min ( or 8/0.8 m / min ) , running at 20 or 30 m / min. Figure 1 shows the outline of the construction . In this paper, CD -type electric hoist , for example, were its installation commissioning inspection, routine inspection, inspection and annual inspections month safety requirements list describes .

Bridge is a steel crane

Bridge is the basic building bridge crane , from the main beam, side beams of several parts. Cross over the main beam frame shop , which has two ends connected to the outer end of the beam, overhead gantry crane beam and fitted with a safety railing walkway . Bridge is equipped with carts transitional institutions , electrical boxes, lifting mechanism , trolley orbit and auxiliary slide wire rack . The bridge is equipped with a cab . The other end is equipped with the introduction of the power of the main Waterloo line . Carts transitional mechanism driven by electric motors,grab bucket crane, brakes , drive shaft, reducer and wheels of several parts. Its methods are focused on the driver and the driver were driving two kinds.

Girder crane beam

Girder crane beam by rigid top chord and overhead gantry crane chord, vertical and diagonal. General welding; Bent or welding rigid, with the vertical rod or CHS friction type high strength bolt connection is used. Suitable for large span and the corresponding small crane lifting weight, light or heavy duty in soft hook crane. Make more complex, the truss node is sensitive to fatigue, need large clearance, there is enough to satisfy the truss height; Crane rail directly laid on the first quarter, make the bridge gantry crane produces larger local bending moment. According to the simply-supported hinged truss and the crane is the most unfavorable position calculate the axial force of bar.

Lifting equipment is a kind of space transportation equipment

Lifting equipment is a kind of overhead gantry crane transportation equipment, main function is to achieve the weight of displacement. It can reduce labor intensity, improve labor productivity. Hoisting machinery is an integral part of modern production, some of the hoisting machinery can also in the process of production for some special process operation, the production process to realize mechanization and automation. Lifting equipment to help mankind in conquering nature change nature of activities, to achieve the past large hoisting and moving objects cannot be achieved, such as heavy ship unit assembly, chemical reaction tower of integral lifting, sports venues the integral lifting of steel roof truss, etc. Use lifting machinery has a huge market demand and good economical efficiency, lifting machinery manufacturing industry has developed rapidly in recent years, the average annual growth of about 20%. Due to production process, from raw bridge gantry crane to products for material handling quantity often use hoisting and conveying machinery is the product of the weight of a few times, even hundreds of times.

To improve the national economy of hoisting machinery

Hoisting machinery sectors of the national economy to improve labor productivity, shortening production cycle and reduce production cost, should not be underestimated role, and therefore is widely used in various types of production enterprises. The pros and cons of hoisting machinery manufacturing quality and use of security technology condition quality directly bridge gantry crane the state property and the safety of life of the masses. In order to strengthen the safety supervision of special equipment, to prevent and reduce accidents, guarantee the people life and property safety, promote economic development, 373 decree of the state council has issued a "special equipment safety supervision regulations", made clear of overhead gantry crane equipment in the design, manufacture, installation, use, inspection, maintenance, renovation and other aspects of the safety supervision management. 

The crane system's work efficiency

The swing on the one hand, lowers the crane system's work efficiency, on the other hand may lead to load with the operator or other objects collide cause casualties or damage. Therefore, many scholars in view of the bridge crane control system for a overhead gantry crane amount of research work: on the one hand require car quickly and accurately reach the target location, on the other hand it also requires can effectively restrain the load swing. The most commonly used open-loop bridge crane control method is the Input Shaping (Input Shaping), but this bridge gantry crane of method for system parameter precision demand is higher, so more and more scholars closed-loop control is used to solve the problem of oscillation inhibition and car positioning. .

Simple electric hoist gantry crane is a crane

Simple electric hoist gantry crane is a crane, which has two kinds of single and double beam. Because of its simple structure, easy manufacture, light weight, low cost, easy installation and maintenance overhead gantry crane obtained the considerable development, widely used in industrial and mining enterprises, railways, docks, warehouses, material yard and other places. Because of electric hoist gantry crane structure is simple, however, in the design, production, installation, inspection process, such as failure to cause enough attention. In the electric hoist gantry crane in use process, if the defect of leg connections, such as fracture hidden danger of overturning bridge gantry crane occur. As a result, the examination link, pay attention to the electric hoist gantry crane leg installation quality inspection, is to ensure production safety, prevention of the accident is an important guarantee. Example: in 2010, the zhuhai YiMenShi inside some temporary steel structure workshop crane accident, at that time, the operators are preparing to lifting items, items in lifting has left the ground, the crane suddenly overall tilt to one side leg, fortunately, at that time the next workshop are not present in more than 20 workers, no casualties at the scene. Accident analysis accident lifting main parameter table 1 accident hoisting main parameter table type MH16-22 A5 rated lifting weight 16 t lifting speed 8 m/min lifting height of 6 m span 22 m working-level A5 cart speed 20 m/min.

Wire rope electric hoist

Wire rope electric hoist by building height, such as rail type is divided into 14 types. Code types of HSG standard building height, linear rail, rigid bridge gantry crane table code class type of hand trolley type HSJ standard building height, type curve track, hand trolley type HLG hinged connection standard building height, linear rail, rigid connection of sprocket trolley type HLJ standard building height, the curve of orbit, hinged connection of sprocket car type HDG high overhead gantry crane building. Electric hoist can be used as a heavy equipment used alone, a small driving after also can be used for overhead monorail crane. Is a kind of compact structure, light weight, high efficiency and easy operations of lifting equipment. Specifications of wire rope electric hoist by building height, track type can be divided into 14 types. Choose type HLJ its appearance figure, symbol and type, the performance of electric hoist wire rope electric hoist code and type code type HSG standard building height, linear rail, rigid connection of hand trolley..

The tension flange of crane beam

The tension flange of crane beam (or crane extension of tension chord) shall not be welded on the hanging equipment parts, and should not be on the spot at the lighter or welding jig. According to the provisions of the deceleration condition, bridge gantry crane properly selected base of the natural logarithm of multi rope friction wheel lifting equipment, the article conforms to the rated load of the pull wire rope with the friction between the friction wheel pad, raising and lowering design load in working braking coefficient; Force braking. Because in the process of lifting overhead gantry crane work not a - round Angle, degree; To appear empty container operation, in this condition, the rope dynamic antiskid safety factor; Such as emergency braking, according to hoisting rope sliding conditions not allowed by the raise the most unfavorable condition or than in accord with the rated load under the condition of raising and lowering a load side wire rope with light load side the cargo when the brake is more bad. Must, in accordance with big static tension ratio, therefore, the operating conditions for determining dynamic system of lifting equipment to work k - double container hollow container runtime allow dynamic boundary conditions. In addition, the balance weight single container to xu line, reduce the rope dynamic antiskid safety equipment, also according to the conditions on the difference of the counterbalance weight coefficient.

tasks furthest apart are given priority as initial tasks

These initial tasks are assigned respectively to different (crane) task groups
as the first member of the group, then all other tasks are clustered according to proximity to them. Obviously, tasks furthest apart are given priority as initial
tasks. When multiple choices exist, overhead gantry crane running time can be reduced by selecting tasks with smaller feasible areas as initial tasks. The model provides
assistance in this respect by displaying graphical layout of tasks and a list of
the size of feasible area for each. After assigning an initial task to a group, the model searches for the closest remaining task by checking the size of overlapping area, then bridge gantry crane it into the task group to produce a new feasible
area corresponding to shape and size of feasible areas, illustrated in Fig. 9. In this case study, from the data and graphic output, the user may become aware that optimal locations led by test sets 1, 2, and 3(Fig. 3) are the best choices (balanced workload, conflict possibility, and efficient operation). Alternatively, in connection with site conditions such as availability of space for the crane position and ground conditions for the foundation,

Crane (crane) operation normally just four driving and driven wheels

Crane (crane) operation normally just four driving and driven wheels, if the weight is very big, bridge gantry crane used to increase the wheel round ways to reduce pressure. When the wheels for more than four, must adopt balanced articulated frame device, make the crane load evenly distributed on each wheel. Bridge of the metal structure is composed of main girder and end beam, divided into the single main girder bridge and double beam bridge two kinds. Single main girder bridge by single girder and in the end on both sides of the span of beam, double girder frame is overhead gantry crane of two main girder and end beam. Main girder and end beam, rigid connection on both ends of the beam is equipped with wheels, to support bridge run on overhead. Main girder welding on the track, for lifting the car running. The structure of the bridge girder type is more than the typical box structure, four truss structure and vierendeel truss structure. Box structure and can be divided into the right box double beam, partial rail box double beam, partial rail box girder to wait for a few kinds. On track box double beam is widely used in a basic form, main girder by on either side of the upper and lower flange plate and the vertical web, rail car arrangement in the center of the line on the flange, its simple structure, easy fabrication, suitable for batch production, but gravity is bigger. Partial rail box double beam and rail box single girder cross section are ranged from upper and lower flange plate and the thickness of the deputy of web, rail car is decorated in the main web above, the casing short stiffening plate could save, in which partial rail box single main box girder is composed of a wide flange instead of two main girder, the weight is small, but made more complex. Four by four pieces of plane truss girder structure combination into a closed space structure, on the surface level on the truss generally covered by bedplate, weight light, stiffness big, but compared with other structures, appearance size, made more complex, the fatigue strength is low, have less production. Vierendeel truss structure similar to partial rail box girders, is composed of four pieces of steel structure of a closed, in addition to the main web for solid abdomen i-section girder, the other three piece of sheet metal in accordance with the design requirements of cutting into many window, form a vierendeel truss without diagonal, in the upper and lower levels of truss surface covered by bedplate, crane running mechanism and electrical equipment installed inside the bridge, weight is lighter, the overall stiffness is large, it is more widely used in China a type. General bridge crane mainly driven by electricity, generally is in the driver indoor manipulation, also has a remote control. Lifting weight of up to five hundred tons, the span of 60 meters. Simple beam bridge crane, also known as crane beam, its structure is similar to ordinary bridge crane, lifting weight, span and working speed are smaller. Bridge girder is composed of steel and plate steel beams or other simple beam, with chain or electric hoist with simple and easy as lifting trolley car, the car at the bottom flange of the h beam. Can bridge along the orbit, on a high shelf can also be along the suspension in elevated the orbit, below this kind of crane is called suspension girder crane. Special metallurgy bridge crane in the process of iron and steel production may take part in the process of the specific operation, the basic structure similar to ordinary bridge crane, but also on lifting the car is equipped with special working mechanism or device. The working characteristics of this kind of crane is used frequently, conditions, job level is higher.

Manual single girder suspension crane what role?

With the market for its increasing emphasis on the development of the machinery industry, for machinery production operations are also getting support, in order to better reflect the effect of the operation of machinery and equipment, already on the market developed more products, each product is new machinery and equipment products are designed to be able to make a better mechanical equipment operating personnel to assist them so that their work can also reduce the burden, so that manual single girder suspension  hoist crane  is better , then it is mainly what role?
1 speed
Today on manual single girder suspension crane operation speed of the process is relatively fast, on this point who used such products people are such a kind of feedback, indicating that the current manual single girder suspension  overhead bridge crane  is better quality , and has an excellent performance, which is more satisfactory place, so in the course of its operation is often the faster, the faster the product is the more promising, so that it is are more useful.
2 Simple operation
Today in the market manual single girder suspension crane is a mechanical device more popular products, because when the operator when used in its feeling is very simple, because it is relatively simple to operate, there is nothing complex functions , not too professional, most people will use it.
This is the manual single girder suspension  bridge gantry crane  in the market, the role played.

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.

For the use of electric overhead traveling crane pay attention to what?

Electric  bridge gantry crane  hoisted on the market today is a relatively high-quality mechanical products, this product on the market is relatively good, because its use is more widespread, and people are more favorable impression of their, like this products on the market is more promising in the development process is often noticed electric crane hoisted a lot of problems, as long as is necessary to immediately find problems to solve, it is more appropriate way to handle it is now suspended for the electric the use of cranes need to pay attention to?
1 species
First, to carry out the production process is often more focus on product variety issues, because every business that requires the use of a variety of products is not the same, always have something different, be used in the course of its operation personnel for electric  overhead gantry crane  species are more understanding and familiarity, so do not ask what they need to know the type of electric overhead crane, what size, etc., which are needed before a clear understanding of its use.
2 image
Is now on the market are required to be a better image of the product, the general image and enterprises are necessarily linked, in its long-term for the image of the process of development is often the most important, whether the product is also well, for businesses both mean need a certain image.
This is the use of electric overhead jib crane  when needed attention.

Select electric single-girder cranes which elements

There are many products in the course of its production is more important, because there are a lot of products in its production when it is paying more attention to quality issues, and in the course of its production is more able to be used , and under normal circumstances in the selection process of electric single girder overhead gantry crane  is relatively a lot of problems need to pay attention, because the choice for mechanical products is relatively little need to be careful, now select electric single-girder crane when there are elements which it?
1.Model
Now, with the enterprises for the electric single-girder crane growing demand, the choice of electric single-girder crane in the process have noted the problem is more and more, in general, when the choice is more important model, different varieties reflected the product model is different, a comparison of product variety is the more upscale models with the more difficult, but not to say that with less, and now electric single-girder  bridge gantry crane  models have been more and more, this is their choice for businesses addition of the probability of a lot.
2 Specifications
In its selection process specifications for the product is more important to note, the product specification is more important, especially in the selection process of the product machine is more need to be careful, careful consideration in choosing an electric single girder crane in the process is more important.
This is in the choice of electric single-girder  overhead bridge crane  several elements that need attention.

Forging crane

Forging  hoist gantry crane  generally have two cars, a car-based platform, designed for hanging in the forging process billets and slabs hanging flip the turn plate (Flipper) use. Another deputy trolley sleeve ingot is used to support the weight. Sets ingot is forged in order to grip and balance during ingot (or forging) weight tool. According to process requirements, two car on the track in their respective work.

Traveling mechanism set up on the main bridge. Depending on the wheel of the weight, with 6-24, or more. In order to facilitate the driver and hammer (hydraulic) with the operator, usually hanging in the cab allows the driver head-forging position, and a damping device. In order to prevent radiant heat forging effect on drivers, using thermal insulation operating room, and in the indoor air-cooler.

This overhead gantry crane  main and auxiliary car roughly the same speed, so that the main and auxiliary car when coordinated to work together. Main small car is equipped with cable reel, cable conductor to manipulate through hanging on a hook on the turn steel machine. There is no hook to prevent the hook in the forging process freely rotating fixtures. In order to reduce the impact load forging the impact of the relevant institutions in turning steel machine parts hanging a spring buffer device.

Forging  bridge gantry crane  from the weight, there are currently 20/5, 80/30, 125/30, 200/80 t and so are several.