Malfunction prevention device of hydraulic construction machine

摘要

The present invention relates to a malfunction prevention device for a hydraulic construction machine, and more particularly, to a malfunction prevention device for a malfunctioning operation device, such as an excavator, which malfunctions without a separate operation by a driver during a malfunction of a hydraulic type construction machine, The hydraulic pump is driven by a hydraulic pump and a hydraulic pump connected to the hydraulic pump. The hydraulic pump is driven by hydraulic oil supplied from a hydraulic pump And an actuator that is provided between the hydraulic pump and the actuator and is switched by the pilot signal pressure applied from the pilot pump to adjust the amount and flow direction of the hydraulic fluid discharged from the hydraulic pump to start, A flow control valve for performing the switching, and the pilot pump and the flow control valve And an electromagnetic proportional valve provided on the flow control valve and adapted to adjust a pilot pressure applied to the flow control valve by application of an electrical signal in response to an operation of a joystick, wherein the flow control valve includes a flow path between the flow control valve and the actuator, And a control unit that is provided in a pilot flow path between the pilot pump and the flow rate control valve to drive the pilot signal pressure applied to the flow rate control valve in accordance with a predetermined electric signal, And a solenoid valve for driving the solenoid valve when a pressure detection signal by the pressure detection means is inputted when the joystick is not operated by receiving a detection signal by the pressure detection means and a signal in accordance with the joystick operation, The pilot signal pressure supplied to the flow control valve is blocked And a controller for controlling the operation of the hydraulic construction machine.