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 .

Three-dimensional hoist crane system of automatic control experiment

Overhead crane load capacity, flexible Steel crane, in the industrial and transport fields have a wide range of applications . However, the overhead crane is a typical nonlinear , strong coupling, due to the drive system to achieve efficient control of its security is facing many difficulties , therefore , control of such systems has become a hot topic. Various crane control methods proposed in recent years , such as sliding mode control, adaptive control , although theoretically possible , but taking into account nonlinear interference and coupling phenomena that exist in the actual system , its usefulness remains to be tested. Experimental methods have become characteristic analysis system , controller design, stability verification indispensable technology tools. For these reasons , we designed and developed a three-dimensional overhead crane system is automatically controlled experiment , in order to verify the relevant control strategies implemented to provide a great hoist crane . The system can not only simulate the actual operation of the real good cable car system , and is very easy to test a variety of control algorithms and adjustments. In order to verify the reliability of the experimental system , the number of species on the overhead crane control method is applied to the experimental system , the experimental results are consistent with the theoretical analysis of the original documents , which illustrate the effectiveness of the system。

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.