HYDRAULIC SUPPORT WITH VARIABLE RESISTANCE AND ENERGY RECOVERY Russian patent published in 2014 - IPC E21D23/16 

FIELD: mining.

SUBSTANCE: hydraulic support with variable resistance and energy recovery includes a hydraulic prop with a safety valve and a hydraulic lock connected to its piston cavity, and a hydraulic control unit. Between the piston cavity of the hydraulic prop and a pressure line there installed is a multiplying gear consisting of a housing, big and small pistons rigidly attached to each other with a stock, chambers of big and small pistons and an intermediate chamber located between them. Besides, the device includes an adjustable throttle and two check valves, which are installed between the multiplying gear and the pressure line. The chamber of the large piston of the multiplying gear is connected to the pressure line through two parallel lines, in one of which an adjustable throttle and a check valve is installed in series, and in the other line a check valve is installed. The chamber of the small piston of the multiplying gear is connected to the piston cavity of the hydraulic prop, and the intermediate chamber of the multiplying gear is connected to atmosphere through a compensation opening.

EFFECT: improved operating reliability and accuracy of maintaining an operation mode of a hydraulic prop; cyclic transfer of hydraulic energy to the pressure line.

1 dwg