| 摘要 |
The present invention relates to a hydraulic control device for construction equipment, comprising: a steering device; work device; and pressure control device. The steering device is provided with oil pressure by a pump to be driven. The work device is provided with oil pressure by the pump to be driven. The pressure control device returns the oil pressure to the oil pressure storage tank when the pressure of the steering device or the work device reaches a predetermined open pressure or more. The pressure control device is controlled to allow the predetermined open pressure to be increased in proportion to the revolutions per minute of a drive of the pump or is controlled using a switch method by setting a predetermined open pressure as the predetermined minimum open pressure and the predetermined maximum open pressure. According to the present invention, the hydraulic control device for construction equipment is able to block an overload to the pump in the case of a drive with low RPMs (a drive with minimum RPMs), thereby preventing stalling of an engine and reducing the torque of the pump. Moreover, the hydraulic control device for the construction equipment can reduce vibration, mileage, noise generation due to reduction of the torque of the pump and prevent an impact caused by starting a drive. |
