The invention discloses a crane secondary ascension downslide prevention system which includes a main reversing valve, a balance valve, a control valve set, a hydraulic motor and a winding speed reducer; the hydraulic motor and the winding speed reducer are connected; the main reversing valve is connected with the hydraulic motor by an oil path via the balance valve, lifting lateral force oil is sent to the hydraulic motor through the balance valve; the main reversing valve is connected with the control valve set by the oil path via the balance valve, the main reversing valve is directly connected with the control valve set by another oil path, and is further connected with the winding speed reducer by the control valve set to improve the oil pressure of the winding speed reducer by control of the control valve set so as to open the brake to lift heavy matters. The crane secondary ascension downslide prevention system can prevent the crane secondary ascension downslide phenomenon. The system is simple, easy to control and low in cost, meets the actual demand of small and medium tonnage cranes, is high in reliability, and meets the demand of different working conditions.


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    Title :

    Crane secondary ascension downslide prevention system


    Contributors:
    YANG XUEFENG (author) / HONG JIANQIU (author) / CHEN ZHIGANG (author) / LI XUEYONG (author)

    Publication date :

    2015-06-10


    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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