CN2210886Y

CN2210886Y - Multi-stage hydraulic jack

Info

Publication number: CN2210886Y
Application number: CN 94243133
Authority: CN
Inventors: 韩水成
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-10-13
Filing date: 1994-10-13
Publication date: 1995-10-25
Anticipated expiration: 2004-10-13

Abstract

The utility model discloses a modified hoisting lifting system for vehicles. A set of or more piston barrel rods (external members) are added in the piston rod and the piston barrel sleeve of the existing single-stage hydraulic jack. So, under the function of the oil pressure, the regulating screw can be driven to realize concatenating lift to solve the problems of narrow altitude range and poor commonality of general jacks. A multi-stage hydraulic jack can exceed the lifting altitude range of a plurality of different standard serial single-stage hydraulic jacks.

Description

Multi-stage hydraulic jack

The utility model relates to vehicle supporting, lifting device, specifically a kind of manual oil jack.

What existing manual oil jack adopted is single stage piston bar structure.Its lift height is limited, when concrete operation, usually need come the bed hedgehopping adjustment by means of cushion block, therefore still exists the inconvenience part.

The purpose of this utility model is to propose a kind of multistage oil jack, and it can make the lifting elevation obtain at double increase easily.

Multistage oil jack mainly is made up of base, cylinder shell, piston-cylinder, top cap, bunker, piston rod, piston, adjusting screw(rod), fuel priming pump device, fuel-return valve and oil circuit, it is characterized in that also being provided with between existing piston bar and piston-cylinder the band piston of a group or more external member and the piston barrel bar of hermetically-sealed construction.

Secondly, said oil circuit, the release oil circuit that comprises contact bunker and pressure oil cavity, the output circuit of contact pressure oil cavity and oil pumping chamber, and the oil return circuit of contact bunker and oil pumping chamber, wherein oil return circuit goes into end opening in corresponding on the far-end one side bunker bottom base with the fuel priming pump setting position.

Owing to adopted multi-level piston tube bar structure (external member) in the technique scheme, second piston tube bar structure particularly, though because the reason of structure and intensity increases to some extent, this multistage oil jack can be crossed over the single-stage oil jack lifting scope of several continuous specifications at the lateral dimension that installs.Its longitudinal size is no change almost, and lift height is obviously increased, and can satisfy the needs of adjustment and lifting without cushion block.

In addition, oil return circuit is gone into the variation of end position, makes jack when laterally pushing tow work is done in overturning, and the oil return opening is unlikely to expose pasta, can work in the same old way, and can not influence the operation of fuel priming pump.Thereby enlarged the purposes of jack.(existing jack can not overturning use)

Be described further below in conjunction with embodiment and accompanying drawing thereof:

Fig. 1 is the structural representation of the multistage oil jack of secondary formula.

Referring to Fig. 1, base 1 links together with cylinder shell 2, piston-cylinder 3, forms bunker 4 between cylinder shell 2 and the piston-cylinder 3, above by top cap 7 cap seals.Piston-cylinder 3 is provided with return port 13.The 5th, filler port, plug envelope at ordinary times.The piston barrel bar 6 that increases newly is between piston-cylinder 3 and piston rod 9, and its lower end is provided with annular piston 16, above and 7 on top cap with seal ring 12 sealings.The 8th, the backflow duct is made air extractor vent and is used.Adjusting screw(rod) 10 is equipped with at piston rod 9 seats of honour, is used for regulating reference position, shortens the lift operation time.Piston-rod lower end is provided with piston 17.Fuel priming pump device 14 is shown in the right side of figure, and it and base 1 and cylinder shell 2 are connected into one, shake at above-below direction by handle and operate.The bottom in its oil pump chamber 15 is associated with two oil circuits: one is output circuit 18, and inlet is at the bottom of the oil pump chamber, and outlet is at the bottom of the chamber of pressure oil cavity 19---on the face of base 1, and be provided with boiler check valve; Another is that oil return circuit 20(dotted line is represented, not on profile position) inlet in the bottom of bunker 4, the outlet at the bottom of the oil pump chamber, also be provided with boiler check valve.The 3rd oil circuit that is located on the jack base 1 is to discharge (backflow) oil circuit 21.Communicate with between pressure oil cavity 19 and the bunker 4, its fuel-return valve 22 sets up, and from the outside by the break-make of manual control control oil channel passage, fuel-return valve 22 positions shown in the figure and position in kind (or design attitude) have turned over 90 degree.

During the lifting lift operation, earlier fuel-return valve is closed tight, basis, ground horizontalization is steady, puts jack well, regulate the position of adjusting screw(rod), load onto the handle of fuel priming pump, fluctuate, hydraulic refrigerant oil enters the oil pump chamber from bunker 4 through oil return circuit 20, simultaneously oil is pressed into pressure oil cavity 19 by output circuit 18, promote piston 17, annular piston 16 work, drive adjusting screw(rod) 10 and boost, weight is lifted.Stop lever operatedly, boiler check valve, fuel-return valve bar up oil circuit, and the position of adjusting screw(rod) is locked.Behind the end-of-job, fuel-return valve 22 is unclamped, the working medium oil in the pressure oil cavity just is back to bunker 4 from discharging oil circuit 22, and adjusting screw(rod) 10 descends with piston rod 9, piston barrel bar 6, breaks away from last to contact with weight, takes out and pushes back original state and place.

If this jack is fallen to a rollover, make the fuel priming pump device be in the top, can be used for promoting the weight translation according to same working process.Because the handle control position is unaffected, the oil return circuit service conditions satisfies, so can normal operation.

The technical program designs according to Pascal's law, compact conformation, and working stability is good.Same reason as long as increase the quantity of piston barrel bar (external member), can be made the multistage oil jack of three grades of formulas or level Four formula.But progression is too much, and lifting speed slows down, and requires also than higher on the structure, and practicality is corresponding influenced.

Claims

1, a kind of multistage oil jack, mainly form, it is characterized in that between piston rod (9) and piston-cylinder (3), also being provided with the band piston of a group or more external member and the piston barrel bar (6) of hermetically-sealed construction by base (1), cylinder shell (2), piston-cylinder (3), top cap (7), bunker (4), piston rod (9), piston, adjusting screw(rod) (10), fuel priming pump device (14), fuel-return valve (22) and oil circuit.

2, multistage oil jack according to claim 1, the inlet that it is characterized in that the oil return circuit (20) in the said oil circuit is located at fuel priming pump device (14) position and corresponds on bunker (4) bottom base of far-end one side.