| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control device that adopts a load sensing control method in electric control, prevents actuator hunting, can further obtain satisfactory operability even in an actuator that should be finely operated, and takes energy saving into consideration.SOLUTION: The hydraulic control device for construction machine including a hydraulic circuit of the load sensing type hydraulic control device includes: switch valves where an output of a variable volume pump, which is connected to a flow rate control part for adjusting volume, is connected via an unload valve; the actuator connected to the switch valves; a hydraulic pilot valve that uses a pilot pressure for actuating the switch valves; a load sensing processing part that calculates load sensing; a variable volume pump output sensor that senses a pressure of the output of the variable volume pump; a load sensing sensor that senses a pressure difference in the unloading valve; a pilot pressure sensor that senses the pilot pressure of the hydraulic pilot valve; and an output part connected to the flow rate control part. |
