CN2304647Y

CN2304647Y - Hydraulic jack with automatic resitting device

Info

Publication number: CN2304647Y
Application number: CN 97227126
Authority: CN
Inventors: 章建; 许文斌; 薛金云
Original assignee: TOOL BRANCH OF HANGZHOU ELEVATORS FACTORY
Current assignee: TOOL BRANCH OF HANGZHOU ELEVATORS FACTORY
Priority date: 1997-09-26
Filing date: 1997-09-26
Publication date: 1999-01-20
Anticipated expiration: 2007-09-26

Abstract

The utility model discloses a hydraulic jack adopting a pressurizing piston to operate a push rod, which is particularly suitable for being served as the power device of a vertical press. The utility model comprises a bottom base, a push rod, an inner cylinder, a liquid storage cylinder, a pressurizing piston and an oil channel and a valve arranged in the bottom base. The oil channel and the valve can be used for enabling the liquid in the liquid storage cylinder to enter the inner cylinder under the function of the pressurizing piston and the liquid in the inner cylinder to return to the liquid storage cylinder when the push rod is reset. The utility model is characterized in that a spring device which can enable the push rod to automatically reset is arranged between the push rod and the bottom base. Thus the problems that the prior hydraulic jack can only complete the half travel range of the jacking movement and the return movement has to be pressurized by the external force and thus inconvenience and unsafety are brought and other problems are solved.

Description

The hydraulic jack of band automatic reset device

The utility model relates to a kind of to give the device of fixed lift lifting load, particularly a kind of hydraulic jack that removes to handle push rod with pressurizing piston.It can be used as the engine installation of vertical press especially.

The existing hydraulic jack that goes to handle push rod with pressurizing piston can be seen from its positive view (Fig. 4), birds-eye view (Fig. 5) and partial enlarged drawing (Fig. 6), it contains base 1, push rod 2, inner cylinder tube 3, liquid storage cylinder 4, pressurizing piston 5, and the cover of device in base can make liquid material in the liquid storage cylinder enter liquid material in inner cylinder tube and the inner cylinder tube is got back to liquid storage cylinder when push rod resets oil circuit and valve under the pressurizing piston effect, and oil circuit and valve are represented in enlarged drawing (Fig. 6).The shortcoming of this hydraulic jack is: after its top lifting in use, can not automatically revert to original reference position, that is its crank motion when work, can only finish half stroke that top lifting is moved, and half stroke of return motion needs also to rely on other impressed pressure to finish.This impressed pressure mainly leans on manpower at present, and is not only hard, and not too safe; As with mechanical external force, then structure is with complicated.

The purpose of this utility model is to overcome the existing shortcoming of above-mentioned existing hydraulic jack, and a kind of hydraulic jack with automatic reset device is provided, and makes it have easy to use, laborsaving and work safety, characteristics such as simple in structure.

The hydraulic jack of the utility model band automatic reset device, include base, push rod, inner cylinder tube, liquid storage cylinder, pressurizing piston, and be arranged on and can under the pressurizing piston effect, enter liquid material in inner cylinder tube and the inner cylinder tube can turn back to liquid storage cylinder when push rod resets oil circuit and valve for the interior liquid material of liquid storage cylinder in the base, its feature is to be equipped with to make the automatically reset spring installation of push rod between push rod is with base.

Spring installation in the utility model hydraulic jack can include a spring, in the inner space that is installed in push rod and be used for a end with spring and be fixed in joint on the push rod and one and be used for end in addition with spring and be fixed in ringbolt on the base.

To and contrast accompanying drawing by embodiment below, the utility model will be further described below.Have in the accompanying drawing:

Fig. 1 is the positive view of the hydraulic jack of band automatic reset device;

Fig. 2 is the birds-eye view of the hydraulic jack of band automatic reset device;

Fig. 3 is the partial enlarged drawing of hydraulic jack top/bottom part among Fig. 1;

Fig. 4 and Fig. 5 are respectively the positive view and the birds-eye vieies of existing hydraulic jack;

Fig. 6 is the partial enlarged drawing of hydraulic jack top/bottom part among Fig. 4.

From Fig. 1 and Fig. 2, can see the structure of the utility model hydraulic jack, it includes base 1, push rod 2, inner cylinder tube 3, liquid storage cylinder 4, pressurizing piston 5, and be provided with in the base can under the pressurizing piston effect, enter liquid material in inner cylinder tube and the inner cylinder tube can turn back to liquid storage cylinder when push rod resets oil circuit and valve for the interior liquid material of liquid storage cylinder, this oil circuit and valve can be seen from Fig. 3, when pressurizing piston presses down, liquid material in its cylinder enters inner cylinder tube by oil circuit 10 and check valve 30, promote the push rod upward movement, when carrying on the pressurizing piston, liquid material in the liquid storage cylinder enters the pressurizing piston cylinder by oil circuit 20 and check valve 30, represents the route that the liquid materials flow is moving with solid arrow among the figure; Pressurizing piston is carried and is pressed down constantly, and the liquid material in the liquid storage cylinder constantly enters inner cylinder tube, push rod constantly makes progress, and finishes the top lifting action.Push rod 2 is hollow shape, that is its inside has columniform space, and in this space spring 13 is housed, and the upper end of its medi-spring is fixed on the joint 12, and this joint is fixed in the push rod top by bolt 11; The lower end of spring is hooked on the ringbolt 14, and this screw is fastened on the base 1.

The utility model jack has been stored up energy in when work owing to push rod constantly stretches at top lifting process medi-spring, and this energy can be withdrawn into push rod original reference position when push rod is finished top lifting work and need be resetted, realized automatically reseting of push rod.When push rod resetted, the liquid material in the inner cylinder tube had been got back to liquid storage cylinder through oil circuit 40, the moving route of the liquid materials flow the when dotted arrow among Fig. 3 represents that push rod resets.

Push rod in the utility model jack can be made split-type structural, and promptly the head end of push rod is made with tubular shaft split, and then they are integrally welded, to make things convenient for the manufacturing of push rod.

Advantage of the present utility model: 1) between push rod is with base, installed and to make push rod automatically reset After the spring assembly, make jack after finishing the top lifting action, its push rod can return automatically to raw bits Therefore be set up, save the labyrinth that push rod is resetted with mechanical external force, perhaps save with manpower as outside The inconvenience of power and dangerous; 2) the utility model jack has kept its original planform and size, And easily manufactured, own wt reduces, and therefore the part that increases and few is conducive to it at each Promoting the use in the top lifting work also is conducive to renovating to existing jack.

Claims

1, a kind of base (1), push rod (2), inner cylinder tube (3), liquid storage cylinder (4), pressurizing piston (5) of including, and be arranged on and can under the pressurizing piston effect, enter liquid material in inner cylinder tube and the inner cylinder tube turns back to the band automatic reset device of the oil circuit of liquid storage cylinder and valve when push rod resets hydraulic jack for the interior liquid material of liquid storage cylinder in the base, it is characterized in that: between push rod is with base, be equipped with and can make the automatically reset spring installation of push rod.

2, the hydraulic jack of band automatic reset device as claimed in claim 1 is characterized in that: said spring installation has comprised one and has been installed in spring (13) in the push rod inner space, one and is used for a end with spring and is fixed in joint (12) on the push rod and one and is used for end in addition with spring and is fixed in ringbolt (14) on the base.