The invention provides a three-level double-action self-attaching hydraulic jack. The hydraulic jack comprises an outer oil cylinder, a first-level piston cylinder, a second-level piston cylinder and a third-level piston cylinder which are sequentially connected in a sleeved manner, wherein an oil passage communicated to the second-level piston cylinder is arranged in the first-level piston cylinder, and a bidirectional pressure valve is disposed on the oil passage. The level-by-level jacking and automatic ordered return of the three-level double-action self-attaching hydraulic jack are reasonably controlled by reasonably setting the pressure value of the bidirectional pressure valve.


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    Title :

    Three-level double-action self-attaching hydraulic jack


    Contributors:
    CAI WEI (author) / PAN XUAN (author) / HUANG MINGFENG (author) / CHEN YIN (author) / LIU JUNWEI (author) / ZHOU DAN (author) / WANG CHUNHUI (author) / YU DUNMIN (author)

    Publication date :

    2015-06-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    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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