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.
Three-level double-action self-attaching hydraulic jack
2015-06-10
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 |