HYDRAULIC SYSTEM OF POWERED SUPPORT UNIT Russian patent published in 2000 - IPC

FIELD: mining industry; hydraulic systems of breakage face powered supports. SUBSTANCE: hydraulic system has hydraulic prop, advancing ram with hollows for advancing of conveyer and support unit; control panel withe module hydraulic control valves; pressure, return and working channels; pressure and return main lines; three-position shutoff device and check valve whose outlet is connected with pressure channel of control panel. Three-position shutoff device is made in the form of two-way cock and three-way control valve which communicates check valve inlet with pressure or return main line. Ram hollow for conveyer advancing is connected or disconnected with return main line by means of two-way cock. EFFECT: higher efficiency of powered support operation. 1 dwg