HYDRAULIC DRIVE OF SHOVEL EXCAVATOR Russian patent published in 1994 - IPC

FIELD: earth-moving machinery; drives of hydraulic shovel excavators. SUBSTANCE: hydraulic power accumulators are interconnected by hydraulic line with check valve, and one of them is connected with pump suction line. Each servo- control unit is provided with control valve. Two of them are connected with spaces of reversible pumps controllers and another two - with control spaces of hydraulic power control valves of actuators drive. Piston spaces of hydraulic cylinders of jib drive are connected by hydraulic control valve with control space, connected with piston space of one of jib hydraulic cylinders and through hydraulic control valve of jib drive - with one of reversible pumps. EFFECT: enhanced reliability of operation. 1 dwg