The invention discloses a hydraulic jack capable of automatically adjusting the oil return speed. The hydraulic jack capable of automatically adjusting the oil return speed is simple in structure, convenient to use and low in manufacturing cost, can return at a slow speed when a jacked heavy object is heavy, and can return at a fast speed when the jacked heavy object is light. The device comprises a wrench driving a small oil cylinder to move up and down, a large oil cylinder and an oil tank, the small oil cylinder is communicated with the oil tank through a one-way oil inlet valve, a one-way oil outlet valve is connected between the small oil cylinder and the large oil cylinder, and the large oil cylinder is connected with the oil tank through an oil return valve. The oil return adjusting device comprises a valve seat and a valve core matched with the valve seat, a pressure spring for jacking up the valve core is arranged in the valve seat, and a liquid flow hole is formed in the valve core. When the return stroke is in a light load, the oil drainage device can quickly descend to improve the oil drainage efficiency, and when the return stroke is in a heavy load, the oil drainage device can slowly descend to avoid damage to machine parts.

    本发明公开了一种能自动调节回油速度的液压千斤顶。旨在提供一种结构简单、使用方便、制造成本低的一种当顶起的重物较重时,能缓速回程,顶起的重物较轻时,能快速回程的自动调节回油速度的液压千斤顶。它包括带动小油缸上下运动的扳手、大油缸、油箱,小油缸通过单向进油阀与油箱连通,小油缸与大油缸之间连接有单向出油阀,大油缸通过回油阀与油箱相连,其特征是在大油缸与回油阀之间安装有回油调节装置,所述的回油调节装置包括阀座和与阀座相配的阀芯,在阀座中安装有顶起阀芯的压簧,在阀芯中制有液流孔。它在回程轻载时,能快度下降提高了泄油效率,在重载时,能缓速下降不会造成对机件的损坏。


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    Title :

    Hydraulic jack capable of automatically adjusting oil return speed


    Additional title:

    一种能自动调节回油速度的液压千斤顶


    Contributors:
    ZHOU AIXING (author) / CHI PING (author)

    Publication date :

    2023-11-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    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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