HYDRAULIC CONTROL SYSTEM OF POWERED SUPPORT UNIT Russian patent published in 1997 - IPC

FIELD: mining machinery building; applicable in hydraulic control systems of powered support units of complexes in mineral mining, and also in the control systems of various hydraulically operated mobile powered complexes where hydraulic props are used. SUBSTANCE: the offered hydraulic control system includes hydraulic prop with safety valve connected to its head end and pilot controlled check valve, control hydraulic unit connected to pressure and return lines with head and rod ends of hydraulic prop, device for building up the pressure connected with hydraulic prop head end. Device for building up pressure is made in form of hydraulic cylinder accommodating transverse wall with central hole to separate the high-pressure chamber from the control chamber, movable piston separating control chamber from low-pressure chamber, movable rod secured with its one end to piston on the side of control chamber and passed through the hole of transverse wall into high-pressure chamber, and extensible indicating rod secured with its one end to the piston on the side of low-pressure chamber, and with its other end passed through hole made in wall of hydraulic cylinder. In this case, low-pressure chamber is communicated with the pressure line of the support unit. Control chamber is communicated with the line of control of head end of hydraulic prop in the control hydraulic unit. High-pressure chamber has shutoff regulated valve whose inlet is communicated with high-pressure chamber, and its outlet, with the head end of hydraulic prop directly and is communicated through check valve with control line of head end of hydraulic prop in hydraulic control unit. EFFECT: higher efficiency. 1 dwg