Four major mechanisms of hand chain hoist

1. Lifting mechanism

It generally consists of a driving device, a chain winding system, an object retrieval device and a safety device. The driving device includes a hand-pulled chain, a hand-pulled sprocket, a brake disc friction plate and a ratchet, etc. The chain winding system includes a baffle, a guide wheel, a latch, etc. The retrieval devices include hooks, rings, grabs, spreaders, hanging beams, etc. Safety protection devices include overload limiter, lifting height limiter, descent depth limiter, and overspeed protection switch.

2. Operating mechanism

It is divided into two categories: tracked operation and trackless operation.

The rail-type running mechanism is mainly composed of two parts: a running support device and a running driving device. The running support device is used to bear the self-weight and external load of the hand chain hoist, and transmit all these to the track foundation building. It mainly includes balancing devices, wheels, tracks, etc. The operating drive device is used to drive the hoist to run on the track, and is mainly composed of reducer, brake, etc. The trackless operating mechanism is an important part of various mobile hoists.

3. Rotary mechanism

It consists of two parts: a slewing support device and a slewing drive device. The former supports the rotating part of the hoist on the fixed part, and the latter drives the rotating part to rotate relative to the fixed part and withstands the vertical force, horizontal force and overturning moment acted on it by the rotating part of the hoist.

4. Luffing mechanism

According to the nature of the work, it is divided into non-working luffing and working luffing; according to the mechanism movement form, it is divided into running trolley luffing and boom swinging luffing; according to the performance of the boom luffing, it is divided into ordinary boom luffing and balanced luffing. Boom amplitude.