The invention discloses a hydraulic system of a lifting platform. The system comprises a hydraulic pump, an oil tank, a lower lifting oil cylinder, an upper lifting oil cylinder and an overflow valve, wherein a rodless cavity of the lower lifting oil cylinder is communicated with the oil tank through a first two-position two-way electromagnetic valve capable of being opened manually, a rodless cavity of the upper lifting oil cylinder is communicated with the hydraulic pump through a first one-way valve, and the first one-way valve allows hydraulic oil to flow to the rodless cavity of the upper lifting oil cylinder through the hydraulic pump; the overflow valve is connected with the first one-way valve in parallel, and both an inlet of the first one-way valve and an oil drainage port of the overflow valve are communicated with an inlet of the first two-position two-way electromagnetic valve. Due to the fact that the oil drainage port of the overflow valve is connected to an oil inlet circuit of the upper lifting oil cylinder and communicated with an oil outlet circuit of the rodless cavity of the lower lifting oil cylinder, rising and falling of the platform can be achieved as long as the opening pressure of the overflow valve is smaller than the minimum pressure in the upper lifting oil cylinder at the initial position of the platform, and repeated testing for determination is not needed. The invention further discloses a lifting platform comprising the hydraulic system.


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    Title :

    Lifting platform and hydraulic system thereof


    Contributors:
    LIU GUOLIANG (author) / ZHU KANGMIN (author)

    Publication date :

    2015-12-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

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