The invention discloses a hydraulic system of a telescopic boom, the telescopic boom and an engineering vehicle. The hydraulic system comprises a first oil way, multi-stage telescopic cylinders, a second oil way, a balance valve, a back pressure valve and a control oil way, wherein rodless cavities of the multiple telescopic cylinders communicate with the first oil way, oil is synchronously fed into or returned from the rodless cavities of the multiple telescopic cylinders through the first oil way, rod cavities of the multiple telescopic cylinders communicate with the second oil way, and theoil is synchronously fed or returned from the rod cavities of the multiple telescopic cylinders through the second oil way, the balance valve is arranged on the first oil way, the control oil way communicates with the control end of the balance valve and the second oil way, the back pressure valve is arranged on the first oil way, the back pressure valve is arranged on the oil inlet side of the balance valve so that preset oil return back pressure can be generated on the first oil way. According to application of the hydraulic system of the telescopic boom, the telescopic boom and the engineering vehicle, shaking can be effectively reduced.

    本申请公开了伸缩臂架的液压系统、伸缩臂架以及工程车辆,包括第一油路、多级伸缩缸、第二油路、平衡阀、背压阀以及控制油路;多个所述伸缩缸的无杆腔与所述第一油路连通,多个所述伸缩缸的无杆腔通过所述第一油路同步进油或回油;多个所述伸缩缸的有杆腔与所述第二油路连通,多个所述伸缩缸的有杆腔通过所述第二油路同步进油或回油;所述平衡阀设置在所述第一油路上,所述控制油路连通所述平衡阀的控制端与所述第二油路;所述背压阀设置在所述第一油路上,且所述背压阀设置于所述平衡阀的进油侧,以能够对所述第一油路产生预设的回油背压。本申请的伸缩臂架的液压系统、伸缩臂架以及工程车辆,可有效减少抖动。


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    Title :

    Hydraulic system of telescopic boom, telescopic boom and engineering vehicle


    Additional title:

    伸缩臂架的液压系统、伸缩臂架以及工程车辆


    Contributors:
    QING LICHUN (author) / GUO FANGYUN (author) / LI HONGSHU (author) / CHEN GUOPING (author)

    Publication date :

    2020-11-06


    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 / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last



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