Bridge crane

When the load on the main girder span camber should be F = LK1000 (0.9 ~ 1.4) (wherein LK-based beam span), but the crane in use, often due to overload, thermal radiation and repair bridge gantry crane irrational factors such as main beam camber disappear. From a city crane factory to investigate the plant manufactured products tested 106 quay cranes situation, the result is the use of the arch disappeared after 1 year, 2-5 years 20% of the arch disappeared 30% to 50%. use 5-10 years more than 60% on the arch disappeared almost entirely disappeared more than 10 years, and produce under torsion, seriously affecting the safety in production. Disappearance of the main beam camber is essentially metal structure deformation. This will cause a malfunction size car run institutions, resulting in wheel overhead gantry crane size skew span error increases, which will affect the smooth operation of the trolley car safety gauge changes, the size of the car, "bite the Road" serious phenomenon. Main beam deflection will produce severe lower level next bend plate waves increases.

Overhead crane parameter identification based on energy conservation

Two degrees of freedom of the bridge crane , due to the driving characteristics of a system input that transport overhead gantry crane the crane swing accompanied the load, which increases the difficulty to accurately position the load handling control . Around the bridge crane anti- sway control launched a lot of research . Presents a hierarchical sliding mode control method , the system state is divided into two groups were constructed sliding plane, control the amount of each sub- sliding surface contains the equivalent control component so as to ensure the system state of each sub- sliding along the slip plane . The establishment of a fuzzy control system, four-input single-output fuzzy controller is optimized for two pairs of input single-output fuzzy controller and a weighted composite of the two outputs. Prediction and compensation based on disturbance eot crane feedforward and feedback controller is designed to effectively eliminate the influence of nonlinear friction of the cable car system. However, numerous studies including the above literature , including both known to stay in the assumed model simulation stage , and no model parameter identification in-depth study . Mathematical models for controller design overhead crane is very important , so the controller based on a simple model structure obtained applications. Common method of system identification of an energy law and CAD models. Accuracy of the components illustrated AutoCAD CAD model method relies on the system , the process can not be accurate.

The main components gantry crane

The main components gantry crane: According to industry standards GB/T14406 requirements, gantry crane overhead gantry crane mainly consists of the following components

A cylindrical wheel

2, buffer

3, block brake

4, rope

5, lifting bridge gantry crane hook

6 cab

7, reducer

8, casting pulley

9, casting reels

10, the motor

11, electronic control equipment

Shipbuilding gantry crane safety monitoring and management system

With the development of society, economic prosperity, port handling equipment is toward automation, high-speed, large-scale and heavy in the direction of development in order to improve the efficiency of port handling operations. In order to ensure safety in Steel crane production , reduce the incidence of accidents , the safety of large lifting machinery monitoring and management is imperative. State Administration of Work Safety , AQSIQ also in 2011 began requiring the progressive realization of the installation of security monitoring and management systems on large lifting machinery, especially the first pilot asked for shipbuilding gantry crane , and clearly the 2014 shipbuilding gantry crane compulsory installation of safety monitoring and management system . System functional requirements in order to achieve effective management of shipbuilding gantry crane and effectively monitor hoist gantry crane the health of the security situation , the functional safety monitoring and management system must meet the following requirements ( 1 ) shall be monitored directly related to the crane usage may lead to security incidents crane operation parameters, including lifting , lifting height , each trolley trip, carts run deflection, wind speed, the same or a different orbit from the security agencies , operating instructions, working hours and total working hours, work cycle and accumulated work cycle. ( 2 ) should be able to easily monitor the status of security incidents resulting in work organization and work equipment, including hoisting mechanism brake status .

Pendulum control method based on anti- sliding eot crane system

As an important bridge crane lifting and transport machinery , in industrial production has been widely used. Controls for overhead cranes are often required for control accuracy , speed and other aspects of a comprehensive anti- pendulum consideration . Trolley horizontally moving the motor by direct control , and therefore the speed and movement of the trolley is easier to achieve precision control . contrast, anti- swing bridge crane system, the crane is often difficult to achieve . mainly due to the swing of the load acceleration, deceleration, and outside interference caused by anti- swing control for crane operation safety is often crucial. currently , research on the overhead crane system has many times the minimum time control of overhead crane systems , using overhead gantry crane method gives an object-based model anti- swing control strategy ; adopt minimum time control thought , would bang-bang control of a group of switching time is defined as the value of a new variable , and through a set of fuzzy control to find the optimal switching time sequence ; study is crane model of a linear time-varying, also uses the optimal control strategy and the characteristics of varying parameters for the object presents a variable feedback gain state feedback control law . currently , intelligent control systems in the crane also has some applications.

Structural design of light electric chain hoist

Henan Nanyang Polytechnic Institute was opened Rui Machinery Co., Ltd. has developed a new type of electric hoist. The product is optimized for improvements made on the basis of HSZ-10 chain hoists on . The new hoist has the following features: disc brake overhead gantry crane replace HSZ-10 chain hoists and hand brake part zipper part , brake sensitive, accurate , and reliable. Planetary gear reducer deceleration torque increases , the planetary gear reducer drive ratio , small size , light weight, safe and reliable. A torque limiter to prevent overload , the motor and transmission disc protection from damage , but also to ensure safe lifting . HDH type 10 t electric chain hoist assembly drawing. Electric chain hoist structure and product type bridge gantry crane chain hoist from the motor, transmission and wheel components , and wire rope hoist the biggest difference is replaced by the rope chain, wire rope hoist to make up a larger volume , more cumbersome shortcomings. Weight is generally 0.5 t (60 type ) , lifting height is 3 ~ 120 m. At present , the domestic electric chain hoist mainly DHY series electric chain hoist and fast small teeth difference reducer electric chain hoist two kinds [ . DHY series electric chain hoist with fast disc brake motor as the driving force.

Finite element hoist crane of complex multi-function wheel with guide workshop steel crane girder crane system

Versatile crane electrolytic production process is the key equipment . The difference between the ordinary crane crane structure itself versatile domestic industrial plant is widely used in large , multi- crane plus ends of the car with a plurality of transverse , and the asymmetry is arranged at one end of the crane , which class versatile bridge gantry crane load is large, and different from ordinary cranes , and used very frequently . Therefore, the steel crane girder crane multifunctional role under the mechanical performance analysis, to understand the mechanism of the force in a complex crane girder crane loads have some practical value. To this end, this paper carried out the following tasks: simulation by ANSYS finite element analysis software to extract different spans , the internal forces versatile crane girder structure under different braking load cases and load case a second role in cross-section at the most unfavorable value. Referring steel design specification design criteria ordinary steel crane girder overhead crane , the crane beam steel for multifunctional system for strength , deflection, stability checking, and the amount of steel girder crane multifunction system evaluated. By ANSYS finite element eigenvalue buckling analysis , taking into account different load cases , different span space model for multi-purpose steel crane girder system for elastic stability bearing capacity analysis, the linear elastic phase overhead gantry crane steel crane girder system buckling load and instability mode . Bridge project in lifting machinery used , depending on its construction and performance, can be divided into small light lifting equipment , lifting machinery and bridge type jib type crane three categories. Small light lifting equipment such as jacks, electric hoists, winches, etc. . Girder bridge type lifting machinery such as cranes, gantry cranes. Such as fixed jib type crane slewing cranes, tower cranes, truck cranes and wheeled , crawler cranes.

The composition of steel wire rope electric hoist

Part of the wire rope electric hoist are: motor, overhead gantry crane mechanism, drum and sprocket. In the motor and the drum position different can be roughly divided into four types.

(1). Currently has no manufacturer production product of this structure

(2) electric hoist motor axis parallel to the roll axis, its advantage for the height and the length of the small size. Its shortcomings for the width size is big, grouping, manufacturing and assembling complex. Track turning radius is big.

In the inside of the drum (3) motor electric hoist, the advantage for the length of the small size, compact structure. Its main shortcoming for motor cooling condition is poor, poor grouping and inconvenience, bridge gantry crane, installation, maintenance, motor power supply device is complicated.

(4) the motor installed on the outside of the drum of the hoist, the advantage for group sex good, high degree of generalization, easy change hoisting height, easy installation and maintenance. The downside is: the length size.

Lifting equipment performance parameters

Lifting equipment performance parameters
Hoisting machinery basic working ability is theoverhead gantry crane performance parameters of weight and level of work. (1) the weight is under prescribed conditions allow the biggest weight lifting, namely rated lifting weight. Generally with magnetic chuck (see lifting sucker) or grab crane, the lifting weight should also include magnetic chuck or the weight of the grab bucket. Boom type crane lifting weight includes the weight of the hook set. (2) the work level is reflect the performance parameters of hoisting machinery general work situation, is to design and choose the important basis of hoisting machinery. It is composed of hoisting machinery bridge gantry crane to be completed within the required during the use of the work cycle of the total number and load condition to decide. The international organization for standardization (ISO) could be divided into 8 hoisting machinery work level. China will only crane is divided into 8, small light lifting equipment, elevator, overhead monorail system has not yet been classified. The operational procedures for strong regularity, repeatability large hoisting machinery, such as dock cranes, loading and unloading ships goods warehouse stacker crane and elevator for blast furnace feeding hopper, the cycle time is also an important parameter. Work cycle refers to complete a working cycle time, it depends on the working speed of the institutions, and related to the transportation distance. The crane is also sometimes use productivity as the important parameters, usually expressed complete crane capacity per hour.