HYDRAULIC SYSTEM FOR FILLING-UP DEVICE Russian patent published in 2007 - IPC E02F9/22 

FIELD: mining, particularly hydraulic drives of earth-moving machines.

SUBSTANCE: hydraulic system comprises hydraulic pump, hydraulic reservoir, hydraulic cylinders for bucket drive, front gate, rear wall, as well as pressure valve with filling-up hydraulic cylinder having rod end communicated with hydraulic reservoir. Serially arranged between hydraulic pump and blind side of filling-up hydraulic cylinder are electrically driven two-position two-way valve member, check valve, hydraulic accumulator with pressure relay and hydrocontrolled two-position two-way and four-way valve members. Two-way and four-way valve members have control cavities communicated with rod end of rear wall drive hydraulic cylinder. Opened line of electrically driven two-way valve member connects hydraulic pump and blind side of filling-up hydraulic cylinder through check valve, hydraulic accumulator, pressure relay and opened lines of two-position two-way and four-way valve members. Closed line of hydrocontrolled two-position four-way valve member disconnects hydraulic pump and rod end of filling-up hydraulic cylinder. All inlets and outlets are connected with each other through the four-way valve member in the second position.

EFFECT: decreased power inputs for filling-up hydraulic cylinder operation due to possibility of hydraulic accumulator usage.

2 dwg