The invention provides a double-acting hydraulic jack which comprises a jack body. A rod cavity joint and a rodless cavity joint of the jack body are connected with a hydraulic lock. A first cavity and a second cavity are arranged in the hydraulic lock. A one-way valve is arranged in the first cavity. The portion, located on one side of the one-way valve, of the first cavity is connected with the rodless cavity joint and a first emergency valve. The portion, on the other side of the one-way valve, of the first cavity is connected with the second cavity through a connection cavity. A sealing piston is arranged in the second cavity. The portion, located on one side of the sealing piston, of the second cavity is connected with the rod cavity joint, a rod cavity oil port and a safe overflow valve. The portion, on the other side of the sealing piston, of the second cavity is connected with the first cavity through the connection cavity. A pressing rod is arranged on the sealing piston. The connection cavity is communicated with a rodless cavity oil port. According to the double-acting hydraulic jack, the hydraulic lock is arranged and can effectively improve safety of the double-acting hydraulic jack in the working process. Meanwhile, damage to single components is prevented from causing damage to the whole jack.


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    Titel :

    Double-acting hydraulic jack


    Beteiligte:

    Erscheinungsdatum :

    2015-11-18


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    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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