Patent ID: 10654696

Abstract:
A hydraulic jack capable of quickly lifting a load includes a frame (1) mounted with a lifting arm (2), a long connecting rod, a tray (4), a bracket and a hydraulic oil pump (3) for driving the lifting arm (2), and further includes a large pump (11) and a small pump (12) for supplying high pressure oil to the hydraulic oil pump (3). An inner cavity of the large pump (1) and a small pump core are axially connected to a hand press (8) respectively. The inner cavity of the large pump (11) is in communication with a first pressure regulation mechanism (9), and the inner cavity of the small pump (12) is in communication with a second pressure regulation mechanism (10). The first pressure regulation mechanism (9) comprise a first upper valve body (90) mounted on a lower valve body (33), a first oil outlet (91) of a communicating oil compartment (32) provided on a side wall thereof, and a first oil inlet (92) provided at a bottom thereof, the first oil inlet (92) being in communication with the inner cavity of the large of the large pump (11). A central hole of the first upper valve body (90) is sequentially provided from bottom to top with a first lower steel ball (93) capable of blocking the first oil inlet (92), a first ball valve base (94), a first pressure spring (95), a first valve core (96) and a first valve rod (97), the first pressure spring (95) being disposed between the first ball valve base (94) and the first valve core (96). The second pressure regulation mechanism (10) and the first pressure regulation mechanism (9) have the same structure.