Winch: a light, small lifting device, also known as a winch, that uses twisted wire ropes or chains to lift or pull heavy objects. The winch can be hoisted vertically, horizontally or obliquely. The winch is divided into three types: manual winch, electric winch and hydraulic winch. Mainly electric winch. It can be used alone or as an integral part of hoisting, road building, mine hoisting and other machinery. It has the advantages of simple operation, large amount of rope winding and convenient displacement, and has been widely used. It is mainly used for hoisting or hauling of buildings, water conservancy projects, forestry, mines, docks and other materials.