The invention relates to a hydraulic control system of a cargo boom, and discloses a control valve unit which comprises a control valve working pipeline connected with a first working oil port and a second working oil port, a direction control valve, a first pressure control valve, a second pressure control valve and a control valve oil return pipeline. The direction control valve, the first pressure control valve, the second pressure control valve and the control valve oil return pipeline are arranged on the control valve working pipeline, the first pressure control valve is located on an oilway between the second working oil port and an energy accumulator, an oil supplementing one-way valve is further installed between the energy accumulator and the second working oil port so that hydraulic oil in the energy accumulator can flow to the second working oil port in a one-way mode, and the second pressure control valve is positioned on an oil way between the second working oil port andthe control valve oil return pipeline. The invention further discloses a hydraulic control circuit and engineering equipment with a telescopic cargo boom. The condition that a telescopic arm moves forwards during emergency braking can be prevented, and potential safety hazards are eliminated.

    本发明涉及起重臂的液压控制系统,公开了一种控制阀单元,包括连接第一工作油口与第二工作油口的控制阀工作管路、安装在所述控制阀工作管路上的方向控制阀、第一压力控制阀、第二压力控制阀和控制阀回油管路;所述第一压力控制阀位于所述第二工作油口与蓄能器之间的油路上,所述蓄能器与所述第二工作油口之间还安装有补油单向阀,以能够使所述蓄能器中的液压油单方向流向所述第二工作油口,所述第二压力控制阀位于所述第二工作油口与所述控制阀回油管路之间的油路上。本发明还公开了一种液压控制回路及具有伸缩式起重臂的工程设备。本发明能够用于防止紧急制动时伸缩臂前窜,消除安全隐患。


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    Title :

    Control valve unit, hydraulic control circuit and engineering equipment with telescopic cargo boom


    Additional title:

    控制阀单元、液压控制回路及具有伸缩式起重臂的工程设备


    Contributors:
    WANG LEI (author) / HE WEI (author) / HUANG ZHEN (author) / LIAO QIHUI (author) / SONG JIANQING (author)

    Publication date :

    2021-01-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B66C Krane , CRANES / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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