| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase the working efficiency, by supplying the delivery flow volume of a main hydraulic pump and also the flow volume of an auxiliary pump when an actuator necessary for a larger flow volume than the maximum flow rate of the main hydraulic pump is individually operated. SOLUTION: When a specified hydraulic cylinder 61 driving a crusher or the like is individually operated, a flow rate control valve 51 is changed over. The delivery oil of a hydraulic pump 2 is supplied to the cylinder 61 through a main pipe line 106 of tune actuator supply side, a pressure compensating valve 41 and a flow control valve 51. In this time, the oil of the auxiliary pump 100 is supplied to the pipe line 106 through an auxiliary pipe line 104, and a check valve 105 and further, supplied to the cylinder 61 through the valve 51. Accordingly, the joined flow volume of the pumps 2, 100 larger than the maximum possible delivery flow capacity of the pump 2 is supplied to the cylinder 61 and hence, the cylinder is accelerated. In this way, the working machine can be rapidly and stably operated.</p> |
