The winch is mainly applied to lifting, pulling and loading or unloading the weight. For example, it can be used to mount and dismount large and medium-sized concrete and steel structure and machinery equipment. Also, it could be utilized as the lifting mechanism of hoisting machinery. This product features orderly-arranged steel wire ropes, safe slinging, smooth transmission and convenient maintenance. This product can be used for the equipment installation in bridge building, port construction, wharf construction, shipyard building and other large-scale factories and mines projects.