STOPE SUPPORTING STRUCTURE FOR FACE SUPPORT IN MINES

摘要

The invention relates to a stope supporting structure for face support in mines, wherein in order to actuate the hydraulic cylinders for carrying out the removal functions, an operating pressure is applied to an operating pressure line lain in the coal face. A pressure increasing pump (6) in the form of a differential cylinder (7) comprising a differential piston (8) is inserted between the main valve and the working chamber of the hydraulic cylinder (7), parallel to the pressure line. The small piston surface of the pump piston in the differential cylinder forms a pump chamber which is connected to the pressure line leading to the working chamber of the hydraulic cylinder by means of a return valve opening in the outlet direction of the pump chamber. An impulse-actuated reversing valve (19) controlled by the differential piston (8) is provided in order to recurrently apply the operating pressure to the working chamber.