| 摘要 |
Device for controlling an actuator of construction equipment prevents voiding of a target actuator, by controlling inertia load and power load and reducing heat generated in its return oil channel by means of controlling the aperture of the return oil channel. The device includes directional control valve 14a for controlling a target cylinder 15a of construction equipment. The directional control valve is switched and controlled by a pilot valve 19a which is provided with an operating lever. A meter-out circuit is provided between target actuator 15a and a tank line 16, the meter-out circuit being separated from a meter-in circuit which is connected to control valve 14a. A meter-out valve 32 provided in the meter-out has a throttle position and a large aperture position, the throttle position being adjusted by external signals Pi, corresponding to strokes of the respective operating levers. External signals Pi, for controlling the aperture of meter-out valve 32, are restricted so as not to exceed limiter pressure which is determined by function between the rotation speed of engine 11 which drives the source of hydraulic pressure and degree of operation of operating levers of other actuators.
|
