CN2091854U - Hydraulic jack with double pumps and double supporting posts - Google Patents

Abstract

The utility model provides a hydraulic jack with double pumps and double push rods through designing, improving and perfecting the theory of a universal hydraulic jack, comprising a load transfer mechanism which is composed of an oil cylinder, push rods, a piston, a jack head, a base, etc., and an oil container of oil tank. A large oil pump and a small oil pump are provided, when the utility model is used, the different oil pumps are selected according to the different sizes of the weights of the lifting objects to operate, so as to reduce labor intensity, improve work efficiency, and meet the goal of the higher lifting travel with an original jack with lower lifting travel. The utility model has the advantages of high efficiency, labor saving, and reliable performance, can be used under the temperature from-20 DEG to 45 DEG, and can meet the requirements of the engineering constructions of lifting, construction, mine, bridge, and heavy machinery industries.

Description

Hydraulic jack with double pumps and double supporting posts

The utility model relates to a kind of and reuses hydraulic jack, particularly a kind of double pump Double Tops bar hydraulic jack of high efficiency high-stroke.

Hydraulic jack because simple in structure, from heavy and light, easy to use.So selected for use by user's welcome than mechanical type jack.

But, normally used hydraulic jack.Because be structural similar, thereby under more application scenario, limited range of use and reduced service efficiency.As the object that will hoist, this object is very little apart from floor level, but that lifting altitude requires again is bigger.As then load-carrying capacity is not enough to adopt the jack of small dimension, as adopts the jack of big specification can't put into below the object again, and only considers that the low-head jack of the big specification of design is difficult to solve the not enough difficulty of lifting altitude, thereby has limited some field of applications.

And for example, the maximum load-carrying capacity the when rated load of jack is its use, but just seldom reach rated load in actual use.The part of often having only rated load, in this case, because oil pump piston is bigger than very with the area of oil cylinder piston, and the area ratio is that jack is under rated load, fixed by a people's operator perforniance, though it is more laborsaving that operate this moment, lifting velocity is too slow, and the jack of especially big specification is more remarkable.Like this, not only reduced work efficiency, and repairing is speedily carried out rescue work, the contention time has great significance.

The utility model is with design on the principle of general hydraulic jack, improvement, perfect, and the novel hydraulic jack of a kind of pair of oil pump Double Tops rod type is provided.

The purpose of this utility model is that following mode realizes: (groundwork of universal hydraulic jack and incomplete structure introduction) its improvement position comprises big or small push rod and is positioned at the piston sealing device that push rod links; Two oil pump devices on the base, and the valve body structure of control liquid flow path direction.

When operating handle, when oil pump piston pumps, fluid promptly is pressed in the large tank.The big piston head slowly rises under the oil pressure effect thereupon, promotes big or small push rod and hoists simultaneously.When the big piston head arrives high limit position, because there is an axially extending bore at the big piston center, the pressure of fluid promptly is transmitted into the valve piston bottom from the hole, promote valve piston again and little push rod rises simultaneously, reach the effect of Double Tops bar, so just can reach the lower jack of original height and satisfy the higher purpose of lifting stroke.

Respectively install a swivel nut in the upper end of big or small push rod external diameter, worked to place restrictions on the push rod extreme higher position.Respectively installed an O-ring seals in the swivel nut again, entered in the oil cylinder, prolonged its service life to stop dust and rainwater.

At the left and right sides of base device two in oil pump not of uniform size.During use, look the weight size of its lifting object, select different oil pump operations, to increase work efficiency.

At the left and right sides of jack oil tube device one pair of carrying handle, for the usefulness of convenient in carrying, one filler port device is arranged in the side upper end of oil tube, jack will unscrew the filler port lid in use, makes air by covering the internal clearance oily tube inner chamber of freely coming in and going out.To avoid jack in use to cause the not normal of jack work because of the positive and negative air-pressure that the fluid volume change in the oil tube causes.

The utility model can be fit to the operation needs under the various environment, and its dependable performance, performance figure are better than universal hydraulic jack.

Below with reference to accompanying drawing preferred forms of the present utility model is elaborated.

Accompanying drawing 1～2 is the best outside drawing of implementing of the utility model.Wherein Fig. 1 cuts open figure for side-looking office, and Fig. 2 is a birds-eye view, and accompanying drawing 3 is the structural principle sketch.

With reference to legend 1 and 3, the space that is surrounded by oil cylinder 6, big push rod 7, little push rod 9, overcoat 12 etc.Cavity between oil tube and oil cylinder has been full of work fluid.Oil cylinder and oil tube are connected on the base 1 with welding manner, and oil return valve rod 4 and oil pump 5 usefulness engage thread are connected on the base.

By pumping of operating handle, drive oil pump work.When the oil pump heart up moved, fluid promptly entered the valve body 13 by the oil circuit hole in the oil tube.Pushing steel ball 15 open enters in the pump housing: when the oil pump heart down moved, fluid was promptly pushed steel ball 14 open and is entered in the oil cylinder by the oil circuit hole, was equipped with an O-ring seals in the lower end of big piston 2 and valve piston 3, because of a through hole is arranged in the big piston.So pressure oil promotes the big valve piston push rod that hoists simultaneously.When rising to the extreme higher position, big piston is stopped by volution 8, increases lever operated power this moment again, oil pressure increases thereupon, and valve piston continues to rise, and little push rod promptly stretches out from big push rod, stop until valve piston contact volution 10, finished the effect of Double Tops bar high-stroke.

Be equipped with top 11 at the head of little push rod, there are two kinds of fixed type and adjustable types the top, adjustable type be a helical structure, before lifting, play the purposes of adjusting original height.

In the time will descending the lifting object, can unclamp the oil return valve rod, fluid promptly turns back in the oil tube, and object descends thereupon.

About base, be equipped with a pair of oil pump that varies in size, select different oil pump operations by the weight size of lifting object during use,, increase work efficiency to reduce labour intensity.

Claims (4)

1, a kind of double pump Double Tops bar hydraulic jack, it comprises load transfer mechanism and oil tube Oil container and is positioned at the carrying handle and the filler port device in the oil tube outside, load transfer mechanism is made up of oil cylinder, push rod, piston, top, base, it is characterized by: big or small double-joint type push rod and on base device have big or small oil pump each one, respectively be equipped with a check valve apparatus in the oil pump lower end, drive the oil pump up-and-down movement by manual-operating mechanism, flow to check valve control fluid, drive the big or small push rod weight that hoists.

2, hydraulic jack according to claim 1 is characterized in that: described big or small double-joint type push rod can be 2, also can be 2 above structures.

3, hydraulic jack according to claim 1 is characterized in that: described check valve can install in the base of oil cylinder lower end.

4, hydraulic jack according to claim 1 is characterized in that: described top can be fixed, also can be adjustable for height sped structure.

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