The invention relates to a hydraulic loading-limit mechanical variable speed
winch, and belongs to the field of hoisting equipment. The hydraulic loading-limit mechanical variable speed
winch comprises a
hydraulic control system, a quick-connecting
high pressure oil
pipe and a drawing head device. The drawing head device and the
hydraulic control system are connected through the quick-connecting
high pressure oil
pipe. The drawing head device comprises a base, a steel
wire rope guide device, a winching cylinder support frame, a
hydraulic motor, a motor protecting frame, a variable speed
transfer case, a winching cylinder, a locking device, a speed reducing mechanism and a gear change hand lever. The steel
wire rope guide device is installed on the base. The
hydraulic motor is fixed to the variable speed
transfer case. The motor protecting frame is arranged outside the
hydraulic motor. The variable speed
transfer case is fixed to the base and connected with the speed reducing mechanism, and the gear change hand lever is arranged on the variable speed transfer case. The speed reducing mechanism is installed inside the winching cylinder, and the
cantilever end of the winching cylinder is supported by the winching cylinder support frame. The winching cylinder support frame is locked through the locking device and fixed to the base. The hydraulic loading-limit mechanical variable speed
winch is reasonable in structure, convenient to operate, low in cost, safe and reliable.