LIFT SPEED CONTROL SYSTEM OF A WORKING DEVICE FOR A HEAVY EQUIPMENT

摘要

PURPOSE: A rising speed control device of a working device of heavy equipment is provided to quickly raise a working device with a high load at low engine rpm. CONSTITUTION: A rising speed control device of a working device of heavy equipment comprises a valve control unit(20) which electrically controls the flow of pilot oil in proportion to engine rpm. The valve control unit is installed in one of two pilot oil lines between two lift cylinder operating units(11,12) of heavy equipment and a remote control valve(6a) of a lift lever(6). The valve control unit allows or blocks the flow of hydraulic fluid from one of the two lift cylinder operating units to two lift cylinders(4).