| 摘要 |
<p>PURPOSE: To obtain a device which easily supplies operation oil leaking from a piston in a hydraulic pressure pump device where a pair of cylinders are alternatively operated. CONSTITUTION: Oil chambers on the side of each piston rod of a pair of cylinders A, B are communicated with each other. When a piston 1 of one cylinder B moves in one direction, a piston 1 of the other cylinder A moves in the other direction for press-feeding cake or the like continuously. In such a press-feeding pump device for cake, circuits to a hydraulic pump 3 are branched from a connection circuit 5 of each oil chamber of the paired cylinders A, B. A valve device 7 is arranged on a branch circuit 6 for opening and closing the circuit. When the operation oil leaks to the oil chamber on the side of the piston rod, the valve device 7 is opened. Due to difference of pressure receiving areas on both sides of the piston 1 the piston is pressed at most on the side of a piston rod and operated with a specified stroke.</p> |
