| 摘要 |
PURPOSE:To control the amount of oil during the excavating operation of an actuator by a method in which a switch valve is provided for one of two control circuits to connect a switching port on excavation side with a pilot switch valve and put into an on-off action as needed. CONSTITUTION:A controller for the working machine of an excavator consists of main circuits 4a and 4b connected through direction switch valves 2a and 2b from main pumps 1a and 1b to an arm cylinder 3 and control circuits 7a, 7b, 7c, and 7d connected through a pilot switch valve 6 from a pilot pump 5 to switching ports 2c, 2d, 2e, and 2f. A switch valve 8 to be operated by ON-OFF action of a switch 9 is provided for the valve 6 and one of two control circuits 7a and 7c to send oil to the excavation side 3a of the arm cylinder 3, out of the four control circuits 7a, 7b, 7c, and 7d. |
