LOAD WINCH Russian patent published in 2003 - IPC

FIELD: mechanical engineering; load lifting facilities. SUBSTANCE: invention relates to winches with hydraulic drive. Proposed load winch has drive motor, power takeoff with constant gear ratio and drum for winding-on load cable. Pump of drive contains power controller, and drive includes several hydraulic motors connected to each other. Hydraulic motors provide operation under pump conditions to regulate load lowering. Automatic connection of output and input of each hydraulic motor is provided by check valves connected to output and inputs of neighbor hydraulic motors. Control over check valves is effected by hydraulic distributors with electromagnetic control which operate two pilot-controlled check valves. Hydraulic motors under stop and lowering conditions operate at pump duty with regulated angular velocity owing to provision of pressure valve controlled from input of restrictor-type controller. Control of pump makes it possible to stop winch drum without disengaging transmission. EFFECT: increased capacity, simplified control of which in operation. 1 dwg