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    • 5. 发明专利
    • PRESSURE OIL CONTROL DEVICE FOR PRESSURE OIL CIRCUIT INCLUDING A HYDRAULIC CYLINDER
    • JPS5594002A
    • 1980-07-17
    • JP85179
    • 1979-01-06
    • SHIN MEIWA IND CO LTD
    • YOSHIDA TSUTOMU
    • B65F5/00F15B11/024
    • PURPOSE:To vary the speed of the rod of a hydraulic cylinder corresponding to the magnitude of load by connecting the return oil to the extension port in extending the hydraulic cylinder and branching the return oil from the head port to a first and second control valve. CONSTITUTION:When a first control valve 14 is changed to an extension position 42 by a solenoid actuator, pressure oil is supplied to a head port 9c through a supply circuit 22, a first control valve 14 and an extension side high pressure circuit 17, while a second control valve 15 is set at a nutral position 35 so that the return oil from the rod side port 9d is returned to an oil tank 23 through a contraction side high pressure circuit 18, the first control valve 14, connecting circuit 29, the second control valve 15 and a return circuit 30 and a pressing plate 6 advances. When the second valve 15 is changed to a high speed position 44, the return oil from the rod side port 9b is joined with the extension side circuit 17 through a retracting high pressure circuit 18, the first control valve 14, the connecting circuit 29, the second control valve 15 and a branch circuit 20 to raise the operating speed of the hydraulic cylinder 9.