| 摘要 |
1. A hydraulic supply system for at least one differential-area (Vp , Vn ) piston of a hydraulic control motor (16) of a pulsation press, in which one pump, which is connected to a relief valve and the pressure line of which is controlled by a directional slide valve, is provided for each piston drive, a pulsator (20) being arranged which conveys oil as a pulsating stream into the same operating chamber (Vn ) of each piston of the hydraulic control motor (16) as the pump and a pressure accumulator additionally being connected for the return of each piston of the control motor (16) in the pressure chamber (Vp ), characterized in that the differential-area (Vp , Vn ) piston of the control motor (16) in addition comprises on one side two axially offset pressure chambers (Vn , Vw ) of differing sizes ; in that the pump (4) acts on the larger pressure chamber (Vn ) of the control motor (16), whereas a further pump (5) acts on the smaller pressure chamber (Vw ) of the sampe piston of the control motor (16) with the interposition of a pulsator constructed as a rotary distributor (20) ; in that the two pumps (4, 5) are each protected by means of a nonreturn valve (8, 9) and the pressure lines thereof are each connected to a pressure accumulator (14, 15) ; and in that the directional slide valve (17), in one of its operating positions, conveys the oil to a chamber (Vp ) on the other side of the piston of the control motor, the second operating chamber (Vw ) being simultaneously connected to the exhaust by a further slide valve (24), whilst the pressure value in the chamber (Vp ) on the other side of the piston above the piston is limited by means of a relief valve (25). |
