What is the reason for the electric hoist not stopping during descent?
2 Answers
Electric hoist not stopping during descent may be caused by excessive brake clearance, in which case the brake clearance needs to be adjusted. Another reason could be severe wear of the brake ring, exceeding the specified value without replacement. In this situation, the brake ring needs to be replaced. Below is relevant information: Electric Hoist: An electric hoist is a special lifting device installed on overhead cranes or gantry cranes. It features compact size, light weight, simple operation, and ease of use, making it suitable for industrial and mining enterprises, warehouses, docks, and other locations. Electric hoists are mainly categorized into: Chain electric hoist, wire rope electric hoist (explosion-proof hoist), corrosion-resistant electric hoist, double-drum electric hoist, winch, micro electric hoist, group lifting electric hoist, and multi-functional hoist.
I've seen many cases where electric hoists fail to stop during descent, mostly due to brake system issues. The brake pads wear out severely over time, becoming too thin to provide sufficient friction, causing the hoist to slip. Alternatively, improper adjustment or loosened screws can misalign the components, leading to brake failure. On the electrical side, a stuck limit switch or malfunctioning motor controller can send erratic signals, making speed control impossible. Mechanically, lack of lubrication in gears and bearings can cause rust, increasing friction and weakening the braking. Overloading is a common cause—if a hoist rated for 100 kg is forced to lift 150 kg, the brakes won't hold. Insufficient lubrication can also overheat and deform components. If this happens, stop the hoist immediately and inspect the brake pads and limit switches first. Safety comes first—call a professional repair team promptly to avoid accidents. Regular maintenance and inspections can prevent such failures, saving both trouble and money.