| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a relief pressure control device for a hydraulic work machine, with which relief pressure control by an electromagnetically variable relief valve can be achieved without operating a work device. <P>SOLUTION: The relief pressure control device includes: a controller 13 for outputting a control signal to control the relief pressure of electromagnetically variable relief valves 10a and 10b according to an adjust signal output from a dial switch 12; a display part 14 for displaying a relationship between circuit pressure output from a pressure sensor 11 and the required pressure of a hydraulic cylinder 1 according to the display signal output from the controler 13; and an operation device 6 constituting a start instruction part for instructing the control start of the electromagnetically variable relief valves 10a and 10b. In a conduit part between the hydraulic cylinder 1 and a conduit part where the electromagnetically variable relief valves 10a and 10b of main conduits 9a and 9b that link a direction control valve 4 and the hydraulic cylinder 1 are connected, stop valves 15a and 15b for opening/closing the conduit part are provided. <P>COPYRIGHT: (C)2012,JPO&INPIT |
