The invention relates to an engineering machinery hydraulic system, and provides a multi-stage oil cylinder hydraulic control system which comprises a control valve and a multi-stage oil cylinder, the multi-stage oil cylinder comprises a plurality of upper-stage oil cylinders and lower-stage oil cylinders which are connected in sequence, and the control valve controls the telescopic action of the upper-stage oil cylinders and the lower-stage oil cylinders through a first working oil way and a second working oil way. The rodless cavity of the upper-stage oil cylinder and the rodless cavity of the adjacent lower-stage oil cylinder are sequentially connected through a first sequence valve, a switch valve and a second sequence valve, an oil way between the switch valve and the second sequence valve is connected with the control valve through a first working oil way, and the rod cavity of the upper-stage oil cylinder and the rod cavity of the lower-stage oil cylinder are connected with the control valve through a second working oil way. According to the multi-stage oil cylinder hydraulic control system, sequential stretching and retracting of the binding type two-stage oil cylinder and independent stretching and retracting of the second-stage oil cylinder can be achieved, the most suitable stretching and retracting mode is selected according to working conditions, and the working efficiency is improved. The invention further provides a crane.

    本发明涉及工程机械液压系统,提供一种多级油缸液压控制系统,包括控制阀和多级油缸,多级油缸包括若干依次相连的上级油缸和下级油缸,控制阀通过第一工作油路和第二工作油路控制上级油缸和下级油缸的伸缩动作,相邻的上级油缸的无杆腔与下级油缸的无杆腔之间依次通过第一顺序阀、开关阀和第二顺序阀连接,开关阀与第二顺序阀之间油路通过第一工作油路连接控制阀,上级油缸的有杆腔和下级油缸的有杆腔通过第二工作油路连接控制阀。本发明多级油缸液压控制系统能够实现捆绑式双级油缸顺序伸缩以及第二级油缸单独伸缩,根据工况选择最合适的伸缩方式,提高工作效率。本发明还提供一种起重机。


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    Title :

    Multi-stage oil cylinder hydraulic control system and crane


    Additional title:

    多级油缸液压控制系统和起重机


    Contributors:
    NIE JUN (author) / TOTOMO (author) / FENG FANGSHUO (author)

    Publication date :

    2023-04-21


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

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



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