The external circuit is the core component that connects the stage electric hoist to the power supply. Its operating status directly determines whether the equipment can start stably, run accurately and stop safely, serving as a prerequisite for ensuring the normal operation of the hoist under all working conditions.
Unlike industrial hoisting equipment that is usually equipped with a closed-circuit protection structure, the external circuit of a stage electric hoist mostly adopts an exposed wiring design, subject to the constraints of installation space, hoisting flexibility and the aesthetic requirements of the stage setting. During long-term use, these exposed circuits are continuously subject to erosion and damage from various factors. On one hand, the frequent disassembly, movement and reassembly of stage equipment are likely to cause the circuits to rub against and collide with hard objects such as metal components and stage trusses, which in turn leads to the abrasion of insulating layers and the exposure of wire cores. On the other hand, changes in temperature and humidity in the stage environment, dust accumulation, electromagnetic interference generated by lighting equipment, as well as accidental pulling that may occur during high-altitude operations, will all accelerate the aging process of the circuits.
If maintenance is not performed in a timely manner, the circuit aging problem will further deteriorate, and even lead to serious faults such as wire breakage and loose or falling-off connectors. Such faults will not only directly cause the shutdown of the stage electric hoist, resulting in economic losses such as delays in performance preparation and stage construction schedules, but also trigger major safety hazards such as short circuits, electric leakage and sudden falling of objects, posing a serious threat to the personal safety of stage workers and the property safety of stage equipment.