Among them, more than 20 tons are large tonnage winches, winches may be quiet use, but also can be used for lifting, road construction and mine lifting and other sluggish structural parts, because of simple control, large rope winding, convenient relocation and widely used. The key skill targets of winch are rated load, approved load, rope speed, rope capacity, etc. Classification winch compliance power is divided into manual, electric, hydraulic three categories.