Patent ID: 9725882
Date: 2017-08-08
CPC Classifications: E02F,F15B

Claim:
1. A flow control apparatus for a construction machine comprising: a hydraulic pump connected to an engine; a hydraulic actuator connected to the hydraulic pump; a control valve installed in a flow path between the hydraulic pump and the hydraulic actuator and switched to control a start, a stop, and a direction change of the hydraulic actuator; a work mode switching valve installed in a flow path between the control valve and the hydraulic actuator and switched to a normal work mode or a floating mode; an electronic valve switching the work mode switching valve to the normal work mode or the floating mode: an automatic mode setting switch for selecting activation or inactivation of a function of the work mode switching valve; a detection means for detecting an operation amount of an operation lever operated by an operator; a pressure detection means for detecting a load pressure of the hydraulic actuator; and a controller outputting a control signal to the electronic valve so as to automatically switch the work mode switching valve to the normal work mode or the floating mode in accordance with working conditions that are determined by an operation of the operation lever input through the detection means and the load pressure of the hydraulic actuator input through the pressure detection means when the operator sets a function of the work mode switching valve to an automatic mode through an operation of the automatic mode setting switch; wherein: