The JQHS20 Air Winch adopts compressed air as power to drive the TMH17 piston air motor, transferring torque to drum through the second Gear Reducer. By operating manual diversion valve on the motor, the winch can perform hoisting, lowering and stopping actions to the wire rope. Considering security, it is specially designed with hand and foot double manual brakes for fear of unexpected accidents. The Double-braking Air Winch is especially fit for hauling, lifting and other work in mines, construction engineering sites, platforms of oilfields off-sea and inland, etc. (Its maximum load is up to 5 ton) The rotary-base make it flexible on the oilfield floor, and the pin-base assure its safety.