The stage hand - operated chain hoist is a tool commonly used for the installation and debugging of stage equipment, as well as the lifting and positioning of materials during performances. The following is a detailed introduction to it: Structural Principle The stage hand - operated chain hoist is mainly composed of parts such as the hand - pulling chain, hand - chain wheel, brake, gear transmission device, lifting chain, and hook. Its working principle is that by pulling the chain, the hand - chain wheel is driven to rotate. Through the gear transmission device, the lifting chain is driven, thus achieving the lifting or lowering of heavy objects. The brake can reliably hold the load when the operation stops, preventing it from slipping. Features - High flexibility: It is small in size and light in weight, making it easy to move and operate in various complex environments on the stage. It can easily reach some narrow spaces or positions that are difficult for electrical equipment to access for work. - Convenient operation: It does not require an external power supply. Only manual pulling of the chain is needed to achieve the lifting and lowering operation. The operation is simple and easy to understand, without the need for professional electrical knowledge, reducing the skill threshold for operators. - High safety: It is usually equipped with a reliable braking device and overload protection device. The braking device can immediately brake when the chain - pulling stops, preventing heavy objects from sliding down. The overload protection device can avoid safety accidents caused by overloading. - Wide applicability: It is not affected by the power situation. It can work normally in both power - free environments and places with unstable power supply. It can be used for various types of stages, including outdoor temporary stages, indoor small - scale theater stages, and large - scale performing arts center stages. Application Scenarios - Stage construction and disassembly: During the stage construction process, it is used to lift and install heavy objects such as stage trusses, lighting racks, and audio equipment. After the performance, it can also conveniently lower and remove the relevant equipment during the disassembly work. - Prop arrangement and replacement: Before the performance, various large - scale props can be lifted to the designated positions for arrangement. During the performance, according to the needs of the plot, props can be quickly and flexibly replaced, providing strong support for the presentation of the performance effect. - Lighting and audio adjustment: It facilitates the staff to fine - tune the positions of lighting and audio equipment to achieve the best lighting and audio effects. Precautions for Use - Inspection and maintenance: Before each use, carefully check whether all parts of the hand - operated chain hoist are in good condition, such as whether the chain is worn or deformed, and whether the brake is sensitive. Regularly clean, lubricate, and maintain it to ensure that the equipment is in good working condition. - Correct operation: The operator should stand in an appropriate position and pull the chain smoothly, avoiding oblique or violent pulling. When lifting heavy objects, ensure that the center of gravity of the heavy object is balanced to prevent it from shaking or tilting.

- Load limit: Operate strictly in accordance with the rated load of the hand - operated chain hoist and do not overload. When the weight of the heavy object is uncertain, a trial lift can be carried out first, and the formal lifting operation can be carried out after confirming safety.