gantry crane strictly enforce the "no hanging ten" system

① command signal is unknown or arbitrary command does not hang;
② not exceed the rated lifting weight lifting;
③ gantry crane spreaders unreasonable or unsound is not hanging objects hanging bundles;
④ Someone or other floating items are not hanging on to put hanging objects;
⑤ Hoist crane brake or other brake safety device failure does not hang;
⑥ hanging heavy traffic when not hanging directly processed;
⑦ pull Xiegua not hanging crooked;
⑧ explosive objects are not hanging;
⑨ objects buried in the ground without pulling hoists;
⑩ angular blocks mouth objects, not really hanging mats.

When hoist crane use , you need to pay attention to what security ?

1 , bridge crane drivers must have a special permit to operate at specified types of operating models , driving personnel to operate strictly prohibited .
2 , before using hoist crane to fully inspect machinery and parts , make sure there is no problem for operation .
3 , are not allowed to drive drunk , with unrelated persons allowed on the train . During the operation to concentrate, and the commanding officers with the good , the operation no smoking , eating, strictly enforce the " no hanging ten ."
4 , operation , someone issued a stop signal should be immediately stopped .
5 , when lifting heavy objects , the distance from the ground not allowed more than 0.5 meters .
6 , prohibited the use of two different from the weight of the crane lifting an object . With the equivalent of two cranes lifting capacity of crane one thing should be taken so that the two can remain vertical lifting cranes measures , its hanging weight plus the weight of the spreader and are not allowed to exceed the sum of the two cranes lifting capacity 80 % Chief Engineer or designee and shall command the presence of someone in order lifting.
7 , the car can not be stacked events , or other items, tools to be fixed.
8 , the bridge gantry crane is not running , hook height to rise to more than one person .
9 , an electric sports car with a cab , in addition to the implementation of beam cranes, electric hoist procedures, should do the following provisions:
( 1 ) when starting running gear, should look at the derailleur is switched on.
( 2 ) is not at full speed in the corners .
 

gantry crane gantry structure is divided according to the form

According to the structure of the door frame in the form of
(A) full gantry crane: the main beam without overhang, the car performed in the main span.
(B) semi-gantry cranes: leg height difference, according to the civil use of space requirements.
(C) double cantilever hoist crane: The most common type of structure, the effective use of its force structure and site area is reasonable.
(D) single cantilever gantry crane: This form of structure is often due to space limitations and be selected.

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 .