HYDRAULIC DRIVE OF POWERED SUPPORT UNIT Russian patent published in 1999 - IPC

FIELD: mining; applicable in powered complexes and units for winning of minerals. SUBSTANCE: hydraulic drive has return and pressure lines, hydraulic prop, hydraulic unit including single-action pilot controlled check valve and safety valve, ram, hydraulic control valves, control members and additional hydraulic line. The latter is connected from one side via additional safety valve with return hydraulic line and via additional hydraulic control valve, with pressure hydraulic line, and plugged from the other side. Safety valve of hydraulic unit has movable seat and its outlet is connected with additional hydraulic line to which hydropneumatic accumulators are connected. EFFECT: reduced power consumption in operation. 1 dwg