| 摘要 |
The present invention provides a flushing circuit for a hydraulic cylinder drive circuit, the flushing circuit being configured so as to flush both the reciprocating hydraulic cylinder and the inside of the drive circuit for the reciprocating hydraulic cylinder while bypassing a control valve body. As a result of this configuration, the circuit is flushed while the precision parts of the control valve body are protected. A hydraulic oil supply/discharge circuit, which connects a hydraulic oil tank, a hydraulic pump for producing pressurized hydraulic oil, and a hydraulic cylinder, comprises: a control valve which is provided near both the hydraulic pump and the hydraulic oil tank and which is provided with at least a directional switching valve; and a multi-function valve which is provided near the hydraulic cylinder and which is provided with a bypass circuit. A detour circuit which detours around the control valve body is branched from a portion of the hydraulic oil supply/discharge circuit, the portion being located between the multi-function valve and the control valve body. When flushing the hydraulic cylinder and the hydraulic oil supply/discharge circuit, hydraulic oil contaminated with contaminated matter detours around the control valve body and circulates into the tank. As a result, the control valve body is protected from the contaminated hydraulic oil. |
