Hydraulic system for working machine, and working machine: Fid-Bau Portal

Hydraulic system for working machine, and working machine

HORII HIROSHI / MORI YUYA

Response delay of an electromagnetic proportional valve (45 (145)) is suppressed without excessively increasing power consumption accordingly. A hydraulic system (HS (HS1)) of a work machine (1) is provided with: a hydraulic actuator (AC) driven by hydraulic oil; a control valve (V) that performs a switching operation for switching the flow rate of hydraulic oil supplied to the hydraulic actuator (AC); and a control device (70) for controlling the control valve (V), the control valve (V) having a solenoid (S) and performing a switching operation in accordance with a current supplied to the solenoid (S), the control device (70) supplying an offset current (101) for switching the control valve (V) to the solenoid (S), and controlling the control valve (V) when the offset current (101) is not supplied. A standby current (100) having a current value (Is) that is smaller than the offset current (101) and that is within a range in which the control valve (V) does not perform the switching operation is intermittently supplied.

抑制电磁比例阀(45(145))的响应延迟而不随之过度增加消耗电力。作业机(1)的液压系统(HS(HS1))具有：液压致动器(AC)，由工作油驱动；控制阀(V)，进行切换向液压致动器(AC)供给的工作油的流量的切换动作；以及控制装置(70)，控制控制阀(V)，控制阀(V)具有螺线管(S)，根据供给到螺线管(S)的电流进行切换动作，控制装置(70)向螺线管(S)供给用于使控制阀(V)进行切换动作的偏移电流(101)，且在不供给偏移电流(101)时，间歇地供给具有比偏移电流(101)小且控制阀(V)不进行切换动作的范围内的电流值(Is)的待机电流(100)。

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