ONE KIND OF FOOT PEDAL HYDRAULIC JACK WITH TWO SPEED PUMP, AND THERE IS A PNEUMATIC SET TO LIFT PISTON QUICKLY ON THE JACK

摘要

This invention involves a type of pneumatic non-load quick dual-speed hydraulic jack, of which, the small of piston ring (17) of hydraulic pump cylinder integrates with pump body (19) and external ring of step pump core (14) to form movable assembly; the middle part of step pump core (14) is provided with pump core step interface (8); the step hole on the same axis of pneumatic valve block on special pneumatic valve structure is provided with washer (48), button (49), pneumatic valve core (45), compressed spring (68) and valve core securing seat (46). The available effect of this invention is stated as follows: the pump core interface used for conversion of hydraulic speed is characterized by the excellent process and low cost; the pneumatic valve parts specially provided for the jack can replace the hydraulic quick pump structure partially when the high-pressure air source is available. High-pressure air delivered to the oil reservoir of the external sleeve (4) will press the hydraulic oil into the oil chamber of oil cylinder, and thus facilitate the quick lift of jack piston under light load or empty load.