The invention provides a three-stage double-acting self-gluing hydraulic jack. The three-stage double-acting self-gluing hydraulic jack comprises an external oil cylinder, a first-stage piston cylinder, a second-stage piston cylinder and a third-stage piston cylinder which are coaxially and sequentially connected to one another in a sleeving manner; and each of the second-stage piston cylinder and the third-stage piston cylinder consists of four secondary cylinder bodies. The three-stage double-acting self-gluing hydraulic jack can be automatically glued to bottoms of adjacent beams on two sides of a hinge seam according to actual working conditions of a field, and the adjacent beams can be stressed uniformly and can also lift and fall synchronously.
Three-stage double-acting self-gluing hydraulic jack
2015-09-02
Patent
Electronic Resource
English
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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European Patent Office | 2024
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