overhead gantry crane presentation and composition

a large cranes overhead gantry crane, the structure of beams and columns was "door" shape, deliberate move on the track, starting with a larger weight. Currently shipyards,Bridge crane container yard cranes and divided into two types, namely, rail-mounted container cranes (RMG) and rubber-tyred cranes (RTG). overhead gantry crane rail-mounted container cranes that, Overhead bridge crane with energy saving, high reliability, lifting capacity, small maintenance workload, easy to automate operation. But its biggest drawback is inconvenient to shift position.
overhead gantry crane is mainly composed of cylindrical wheels, bumper, brake blocks, wire rope, lifting hooks, cab, reducer,rail mounted gantry crane pulley casting, casting reel, electric motors, electronic control equipment consists of the following components.
After rotating overhead gantry crane hook, wire rope hook on the kink together, this time can no longer be landing hook operation, or they may make one of the Rope damaged by excessive force, you can take the following approach:
   (1) Under heavy ground is not high and the performance permit crane, gantry crane with luffing methods can put weight down, crane hoist then put a positive spin hook.
   (2) If the weight has been lifted high off the ground, you can only think of a way close to the surrounding buildings, or other person gantry crane hanging cage to spin positive hook.
   (3) In the event the hook rotated, the rope should be released within the gantry torque, the specific method is: Bridge crane to hook into the ground and untied the rope fixed end, in accordance with the rotation of the hook m multiplied by the number of turns of wire rope n is the number of matches cardinality k (as the case may increase or decrease), shares in the reverse direction by rope twist, turn the end of the rope to release torque, and then install the fixed end. Boom will play a maximum elevation of lifting machinery, repeated several times to check the effect of hook ups and downs, you can repeat the above steps until the hook is stable.

Introduction garbage grab crane

Garbage grab crane for municipal solid waste and hazardous waste incineration plants or municipal solid waste composting plant waste feed system, is mainly responsible for garbage feeding, handling, mixing, weighing extract and work. Enables manual control, semi-automatic control,cranes for the steel industry automatic control mode of operation, with automatic capture, automatic repeat feeding, automatic repeat inverted stack, automatic parking and other processes, and has a large lifting height of the anti-swing, real-time dynamic measurement, grab condition monitoring, fault diagnosis automatic alarm, remote diagnosis and reporting statistics. explosion-proof electric hoistGarbage grab crane can also be achieved slowly for sustained feeding fluidized bed boiler, which is set according to the material needs of the grab open discharge opening and the duration of the process by avoiding feeding mouth "bridge."

overhead crane inspection and maintenance of six months

1 ) Check all gear reducer and wear, pitting damage to the Overhead bridge crane tooth surface should not exceed 30% of the engagement surface and a depth of not more than 10% of the original thickness of the tooth (fixed chord tooth thickness ) ; wear of gear tooth thickness percentage of the original tooth thickness does not exceed 15% to 25% ; checks bearing the state ; replace oil .
2 ) Check the large and small wheels condition, lubricate the wheel bearings to eliminate the phenomenon of gnawing track .
3 ) Check the main Bridge gantry crane beam, the beam end whether to open the main seam welding, corrosion phenomena , rust should not exceed 10 % of the original thickness of the main force components whether fatigue cracks ; various rails , brackets are intact ; inspection girder, end beam and tighten the bolt again .
4 ) Check the main beam deformation . Check rail trolley case . Under no-load main beam interference should not exceed their span of 1/ 2000 ; beside the main beam bent inwards level shall not exceed 1 /1500 to measure length ; trolley rail track should produce the phenomenon , the top surface and side rail wear ( sided ) volume must not exceed 3mm.
5 ) Check the KS Crane Group reel , the reel wall wear should not exceed 20 % of the original thickness of the rope groove convex peak does not strain sharp .
6 ) All bolts and tighten the fastening bolts on the crane .

bridge gantry crane girder structure according to the classification by primary forms

1 single girder gantry crane
Single Bridge gantry crane cantilever structure is simple, easy to manufacture and installation, small own quality, main beam, mostly off-track box-shaped frame structure. Compared with the double girder gantry crane, the overall stiffness of the weaker. Therefore, when the starting weight Q ≤ 50t, when the span S ≤ 35m, can use this form. Single girder cranes door main gate leg has L and C forms. Facilitate the manufacture and installation of L-type, the forces better, the smaller their quality, but the leg lifting cargo through space at a relatively small number. C-leg formed inclined or curved shape, the purpose is to have a large lateral space for the goods pass feet.
2 double girder bridge crane
Double girder gantry crane carrying capacity, span, good overall stability, variety, but the quality of their starting weight compared with the same single-girder gantry crane to be bigger, the cost is higher. Depending on the structure of the main beam, can be divided into two box girders and trusses form. It is generally use more box-shaped structure.

Bridge crane

Bridge crane bridge is a bridge crane runs on an elevated track , also known as the crane . bridge crane bridge laying along the elevated tracks on both sides of the longitudinal running , lifting trolley along the track laid on the bridge sideways , forming a rectangular scope of work , you can take advantage of the space under the bridge lifting materials , not hampered by ground equipment .
Bridge gantry crane is widely used in indoor and outdoor warehouses, factories , docks and open storage yard , etc. . Bridge crane bridge crane can be divided into ordinary , simple beam bridge crane bridge crane and metallurgical dedicated three.
General overhead cranes generally lifting trolley , bridge run institutions , bridge metal structures. Lifting trolley and hoisting mechanism consists of the trolley run institutions and small frame of three parts.
Lifting mechanism includes a motor , brake , reducer, drum and pulley . Motor through reducer, driven reel rotation, so the rope from around the reel or roll down to lift heavy objects . Small frame is the bracket and install the hoisting mechanism and operating agencies and other parts of the car chassis , usually welded structures .

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.