I. Introduction

Chain Hoist (Chain Hoist) is a kind of equipment used for lifting and suspending heavy loads, which mainly consists of chain, control mechanism (manual or electric) and load-bearing structure. Users can lift and suspend heavy loads by pressing buttons or operating handles. With convenient operation and high safety, it is widely used in the fields of industrial manufacturing, building construction, logistics handling and entertainment performance, etc. It is one of the important equipments in modern lifting and moving operations.

Types and internal structure

Chain hoists are divided into manual chain hoists and electric chain hoists according to the driving method, of which electric chain hoists are subdivided into industrial and entertainment types. This article focuses on the entertainment electric chain hoist and its application in the performing arts scene.

The entertainment electric chain hoist is mainly composed of the following core components:

- Motor: provides the power source;

- Reducer: reduces motor speed and outputs greater torque;

- Load-limiting clutch: prevents overloading and ensures the safety of equipment and personnel;

- Brake: fast braking, avoid slipping;

- Limit switch: to control the running limit of the chain and prevent misoperation;

- Load cell: to realise load detection and protection control;

- Lifting chain: as a load-bearing path, it is used for lifting and lowering movement of objects.

Main technical parameters

The core technical parameters of electric chain hoists for recreational use are as follows:

1. Load carrying capacity: common rated loads include 500kg, 1 tonne, 2 tonne and other specifications.

2. Lifting height: generally 10~30 metres, commonly 25 metres chain length for performance scenes.

3. Lifting speed: common speeds include 4, 6, 8, 16, 21, 24, 28, 30 metres per minute, and some high-speed hoists can reach 0.5 metres per second.

4. Safety devices: Equipped with upper and lower limits, overload protection, emergency stop and other functions to ensure a safe and controllable performance process.

5. Power supply type: support single-phase or three-phase AC power, also optional DC power supply model.

6. Control mode: support handle, remote control, programme automatic control and other modes, suitable for diversified stage system requirements.

Typical application scenes

1. Entertainment bars: Chain hoist facilitates the quick replacement of the staging device, and the free combination and updating of the lighting set is achieved by replacing the lifting point, which is both flexible and beautiful.

2. Theatre studio: Theatre and studio scenes often require temporary props adjustment. High-speed electric chain hoist support multiple synchronous linkage, with high precision, high speed, high load performance advantages, can replace the traditional fixed lifting point system.

3. Mobile performances and large-scale stage: such as large-scale concerts and cultural performances, often using dozens to hundreds of high-speed electric hoist to achieve the scene film lifting, props and lighting changes. Through the centralised control platform, all hoists can be grouped for management and precise control.

V. Distributed control system application

In order to meet the distributed management needs of large-scale performance system, modern CNC hoist system adopts the following configuration:

1. the driving unit is deployed near the gourd, which can be quickly adjusted with the movement of the equipment;

2. each drive unit through the power line and signal line ‘hand in hand’ cascade mode connection, connection is simple and reliable. 3;

3. The main control unit manages hundreds of hoists centrally via signal lines, improving control efficiency;

4. The console has a redundancy mechanism and can be configured with multiple backup consoles to achieve system hot standby disaster recovery and guarantee uninterrupted performances.

Sixth, conclusion

entertainment electric chain hoist with its high efficiency, safety, flexible operation performance, in the performance, theatre, exhibition and other temporary hanging occasions play an irreplaceable role. With the intelligent development of stage equipment, chain hoists are also evolving in the direction of high-speed, automation and modularity, providing a solid guarantee for the diversified stage effects in the entertainment industry.