Self-supporting tensioner is mainly used by coal mines to dispatch mine cars or auxiliary traction distribution mine ground, metallurgical mines or construction sites, etc. It can also be dispatched and other transportation full range of products equipped with electrical appliances are isolated and can be operated safely in an environment with gas and coal dust. The winch with slotted tensioner is composed of motor, upper roll compound, general term of brake/hydraulic push rod, base, cover and other parts. Structure are used two-stage planetary gear transmission, with compact structure, high efficiency, easy operation, low noise, braking safety and reliability, etc. JD-2.5 and above models can provide one-way and two-way exchange with pedestal according to the needs of users.