| 摘要 |
<p>PURPOSE:To operate the slewing motion and the elevating motion of an excavating device simultaneously by a method wherein the switch-over valve controlling the slewing motor and the arm switch-over valve controlling the hydraulic cylinder equipped at the intermediate arm of the excavating device, are arranged in series. CONSTITUTION:The pressure oil from an oil pump P1 is supplied through the working oil path 9a of a working circuit 9 to an oil motor 2' for revolution. Further, the pressure oil is circulated through a side-path 9b returning from the motor 2' entered into a slewing switch-over valve 2a, then through a supply path 16 to an arm switch-over valve 5a at downstream. As the pressure oil is supplied through series path 14 to the arm switch-over valve 5a, when the switch-over valve 5a is in the work position, the oil is supplied to a hydraulic cylinder 5' through working circuit 10 and the hydraulic cylinder 5' is functioned. Thus, after driven the motor 2', the returning oil is supplied to the arm switch-over valve 5a and driven the motor 2' and the hydraulic cylinder 5' simultaneously.</p> |
