Overhead Crane System

BY Dongqi Crane IN Overhead Crane Blog

Overhead Crane system mainly includes the bridge frame, the crane travelling mechanism, the trolley travelling mechanism, lifting mechanism and operation room. Dongqi Group, a famous crane supplier, provides lifting cranes with best quality and price. Dongqi Bridge Crane has resonable structure and perfect travelling system.

The bridge frame

It is kind of travelling metal structure which sustains the trolley’s weight and travels on the track through the wheels. It is composed of main girder, end girder, trolley track, walking platform and guardrail. The bridge frame mainly has two types, box-type structure and truss structure.

The crane travelling mechanism

It includes electric motor, reducer, transmission shaft, coupling, brake, angular bearing box, wheels and other crane parts. The crane wheels are anchored on the end girder through angular bearing box.

After power-on, electric motor produces electromagnetic torque and passes it to reducer through brake coupling and floating shaft, through slowdown gear, the output shaft drives the crane wheels travel on the track through coupling.

The crane travelling mechanism has two types of drive, concentrated drive and respective drive. Concentrated drive is that one motor drives the driving gears on the sides of the crane through transmission shaft; respective drive is that two motors drive the driving gears on the sides of the crane respectively.

The trolley travelling mechanism

It includes drive device, transmission device, support device and brake device. There are also protection devices on the trolley, such as buffer, guardrail. The trolley frame has two types, casting structure and welded structure, the latter is common.

The trolley travelling mechanism has two kinds of drive styles. First, the reducer in between the trolley’s driving gears, the torques bearing by reducer output shaft and transmission shafts are similar. Second, the reducer is on the side of trolley’s driving gear, in this way, installation and maintenance are convenient.

Lifting mechanism

It is the basic mechanism of the crane system. It mainly includes drive device, transmission device, and winding device, extract device and brake device. In addition, according to practical needs, assist devices can be set, such as limit device and loading-capacity limiter. Lifting mechanism has two types, single- hook type and double-hook type.

After power-on, the electric motor produces electromagnetic torque and passes it to the high-speed shaft of reducer through coupling and transmission shaft, then through gear transmission reducer, it dives the drum rotating around fixed axis, and thus the wire rope with extract device can roll in and roll out, so the material can be lifted up and down.

Operation room

It is also called cabin. In the operation room, there are protection devices, compact control box, electrical protection device, operation systems of the crane system, the trolley system and lifting system.