The invention discloses a boom variable-amplitude hydraulic system. The system comprises a main pump, a main valve, a variable-amplitude oil cylinder, a first oil way and a second oil way. The first oil way is connected with a first cavity oil port of the variable-amplitude oil cylinder. The second oil way is connected with a second cavity oil port of the variable-amplitude oil cylinder. The first oil way is connected with a first work oil port of the main valve. The second oil way is connected with a second work oil port of the main valve. The main pump is connected with an oil inlet of the main valve, and a pressure control valve is arranged in the first oil way. The hydraulic system further comprises a servo pump and a servo oil way. The servo pump supplies oil to the servo oil way which is connected with a pilot oil port of the pressure control valve. A hydraulic valve is arranged in the servo oil way and controls the opening degree of the pressure control valve. The hydraulic system solves the problem that a balance valve in the prior art is frequently opened and closed and accordingly a beam waggles, and improves boom variable-amplitude operating stability and micro movement performance.


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    Title :

    Boom variable-amplitude hydraulic system and crane


    Contributors:
    QI FANG (author) / ZHU ANNING (author)

    Publication date :

    2015-10-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

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



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