| 摘要 |
<P>PROBLEM TO BE SOLVED: To adjust operation speed of a hydraulic actuator while emphasizing operability or fuel consumption. <P>SOLUTION: A control unit 12 of a hydraulic shovel controls the supply of the working oil to the hydraulic actuator. A pressure regulating knob 21 to determine preliminarily the correction amount of the pilot pressure, which is set up by the control lever 13 according to the work, is prepared. The pilot pressure which is operated by a control lever is set for the pilot pressure pipeline 16. The pilot pressure is detected by a pressure sensor 20 and input into the control means 15, and the correction amount of the pilot pressure is determined by considering the correction signal about the correction rate of the pilot pressure which is determined by the pressure regulation knob 21. The signal of the correction amount is output to the electromagnetic proportional reducing valve 28 from the control means 15 and the pilot pressure is corrected. The pilot pressure corrected by the electromagnetic proportional reducing valve is supplied to a control valve 14, the supply volume of the working oil from the opening area and the pressure loss to the hydraulic actuator is set up by operating the stem prepared in an oil route 19, which increases and decreases the operation speed of the hydraulic actuator. <P>COPYRIGHT: (C)2012,JPO&INPIT |
