| 摘要 |
Disclosed is a hydraulic system provided with pressure compensating valves to improve controllability during combined operation of controlling both pivot motion and work equipment. A hydraulic system for construction equipment according to the present invention comprises a hydraulic pump, a control apparatus for work equipment and pivot motion, an actuator for work equipment, a pivot motor, the actuator and pivot motor connected to the hydraulic pump, a first control valve for controlling the working fluid supplied to the actuator, a second control valve for controlling the working fluid supplied to the pivot motor, a check valve installed in a flow path for sensing the load pressures of the actuator to take the maximum of the load pressures, a first pressure compensating valve with the opening size being controlled according to the difference between the maximum load sensing pressure and the pressure of a first control valve outlet flow path, a second pressure compensating valve with the opening size being controlled according to the difference between the maximum load sensing pressure and the pressure of a second control valve outlet flow path, a maximum load pressure sensor for sensing the pressure of the maximum load sensing pressure line, and a control part for controlling the outlet flow amount of the hydraulic pump, wherein the load pressure of the pivot motion side is not connected to the first pressure compensating valve of the work equipment side during combined operation of the pivot motion and work equipment. |
