CN202099011U

CN202099011U - Jack

Info

Publication number: CN202099011U
Application number: CN2011200165186U
Authority: CN
Inventors: 唐坤瑞
Original assignee: TA TA TECHNOLOGY (NINGGUO) Co Ltd
Current assignee: TA TA TECHNOLOGY (NINGGUO) Co Ltd
Priority date: 2011-01-13
Filing date: 2011-01-13
Publication date: 2012-01-04
Anticipated expiration: 2021-01-13

Abstract

The utility model discloses a jack which comprises a cylinder body that is internally provided with a mandrel through slidable mounting. Two ends of the cylinder body are respectively provided with a top base and a bottom base. An inner cylinder is sleeved on the mandrel. A main oil chamber is provided between the inner cylinder and an inner wall of the cylinder body. An auxiliary oil chamber is provided between the inner cylinder and the mandrel. An end of the top base is provided with a chamfer angle which right opposes a spring gasket. An oil pressure piston rod is slidably mounted on the bottom base. Two stabilization rings are provided between an end of the mandrel and the bottom base. The stabilization rings are sleeved outside the mandrel. The mandrel stopping operation of the jack is stable, and therefore the cylinder more accords with the requirement. Higher safety and higher stability in lifting and descending processes of the mandrel are obtained.

Description

A kind of jack

Technical field

The utility model relates to a kind of jack.

Background technology

Jack is that a kind of the top with rigidity lifted part as equipment, through the light little weight-lifting equipment of top bracket or bottom claw jacking weight in stroke.Can be divided into 3 kinds of rank-and-pinion jack, lifting screw and hydraulic jacks by architectural feature.Jack is the simplest weight-lifting equipment of a kind of lifting highly little (less than 1m).It has two kinds of mechanical type and fluid pressure types.The mechanical type jack has rack-and-pinion and spiral two kinds again, because hoisting capacity is little, the operation effort generally only is used for flight-line maintenance work, and is inapplicable in repairing the bridge process.The fluid pressure type jack structure is compact, and stable working has self-locking action, so use extensively.Its shortcoming is that lifting is highly limited, and lifting velocity is slow.The shortcoming below but present jack exists: 1, axle does not have any inhibiting device; 2, axle has only terminal stabilizing ring; 3, check valve is positioned at bore end.

The utility model content

The purpose of the utility model provides a kind of jack, and the axle stop motion is stable, thereby oil cylinder more meets the requirements, and is safer, more stable in axle rising and the decline process.

The technical scheme of the utility model is following:

A kind of jack includes cylinder body, is slidingly fitted with axle in the cylinder body; The two ends of cylinder body are separately installed with footstock, base, are set with inner core on the axle, are main oil pocket between inner core and the inboard wall of cylinder block; Be secondary oil pocket between inner core and the axle, the end of footstock is provided with chamfering, and chamfering is right against trip ring; Be slidingly fitted with the hydraulic piston bar on the base, be provided with two stabilizing rings between axle end and the base, outside stabilizing ring suit and the axle.

In the oil return circuit in the described base flow-limiting valve, check valve are installed.

Described check valve is installed in the interior perforate of base with the control thimble is concentric.

The beneficial effect of the utility model is following:

1, prevents axle overshoot stroke in the upward movement process.Shortcoming before improving, axle possibly continue upward movement after arriving predetermined stroke, and is undesirable, and is prone to cause danger.Improve the back advantage, after axle arrives predetermined stroke, be located at the prevention that the trip ring here receives the chamfering of footstock, the axle stop motion, thus oil cylinder more meets the requirements, and safer.

2, improve preceding shortcoming, have only a stabilizing ring.Behind the pipe, possibility is owing to unbalance stress causes rocking of axle, initiation potential in axle rises or drops to.

Improve the back a bit, increase a stabilizing ring herein, more stable in axle rising and the decline process.

3, shortcoming before the change in manufacturing process, guarantee that Kong Yiyu hole two concentric difficulty are very big; Control thimble in the use; Easy and hole two ends collide with and can't push up the little steel ball in the check valve smoothly, make check valve lose former due effect, and axle can't descend.Change back advantage, even Kong Yiyu hole two decentraction are pressed the control thimble and also can be backed down the little steel ball in the check valve smoothly, hydraulic oil flow is clear and coherent smooth, axle descends.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is the A-A revolved sectional view of the utility model.

The specific embodiment

Referring to accompanying drawing, a kind of jack includes cylinder body 1, is slidingly fitted with axle 2 in the cylinder body; The two ends of cylinder body are separately installed with footstock 3, base 4, are set with inner core 5 on the axle, are main oil pocket 6 between inner core and the inboard wall of cylinder block, are secondary oil pocket 7 between inner core and the axle; The end of footstock is provided with chamfering 8, and chamfering is right against trip ring 9, is slidingly fitted with hydraulic piston bar 10 on the base; Be provided with two stabilizing rings 11 between axle end and the base, outside stabilizing ring suit and the axle, in the oil return circuit in the base flow-limiting valve 12, check valve 13 be installed; Check valve and control thimble are installed on a side, guarantee the two concentricity, hole one, hole two are easy to processing.In the base holes course of processing, be difficult to guarantee the concentricity in hole one, hole two, and the control thimble must back down steel ball and could axle descended draining, if check valve is loaded on hole one; The control thimble is loaded on hole two; Be difficult to guarantee that the control thimble can correctly be pressed into steel ball, for this reason with push bolt, flow-limiting valve is placed on hole two; And check valve is placed in hole one, the control thimble.Hole one, hole two are easy to processing, and can guarantee the smoothness of stream.

The use of the utility model is:

1. press the hydraulic piston bar, hydraulic oil is pushed the medium and small steel ball of check valve open in second chamber, flows into first flow, and first aperture terminal through interior pipe flows into first chamber.Pressure constantly increases in first chamber, promotes the axle upward movement.

2. unclamp the hydraulic piston bar, spring reset promotes hydraulic piston and resets, and pressure reduces in second chamber, and hydraulic oil is back to second chamber through the little steel ball that the 3rd runner promotes in the check valve in the 3rd chamber.(the check valve direction: when allowing that hydraulic fluid pressure is higher than the spring barrier force in the 3rd chamber, hydraulic oil flow stops that to second chamber hydraulic oil flows to the 3rd chamber through check valve in second chamber).

3. continue to push repeatedly the hydraulic piston bar; Take care shaft end second aperture, arrive the initial crucial point of footstock helical flow path, after axle rises to the highest line journey; Hydraulic oil through helical flow path in the footstock, flows into the 3rd chamber through first aperture by terminal second aperture of axle again in first chamber.

4. press the control thimble, back down the little steel ball in the check valve, the hydraulic oil in high pressure conditions first chamber is through first aperture; First flow, second runner, push bolt; Flow-limiting valve, check valve, the 3rd runner is back to the 3rd chamber; Receive the metering function of cushion valve, axle slowly at the uniform velocity moves downward.

5. in order to prevent that the axle upward movement from surpassing stroke, the spy sets up trip ring in the terminal specific dimensions of centrifugal shaft position.After axle surpassed stroke, the terminal trip ring of installing of axle can receive the restriction at footstock chamfering place, stops upward movement.

6. for axle stability in motion process is increased, special at 2 stabilizing rings of axle 11 terminal installations.Because inner tube diameter is little than the centre hole of base internal diameter, it is terminal and cause and rock, special at the terminal intersection increase of axle and interior pipe stabilizing ring to prevent to surpass interior pipe at the terminal stabilizing ring lowering position of axle;

7. too fast in order to prevent that axle from descending, in base oil return circuit side flow-limiting valve is installed.Hydraulic oil promotes the oil return cushion valve, motion backward, and the oil return cushion valve stops up the 3rd aperture in the oil return buffering valve seat, and pressure equates before and after the oil return cushion valve; Spring reset promotes, and the oil return cushion valve travels forward, and the 3rd aperture is opened; The hydraulic oil circulation, like this repeatedly, play the effect of current limliting speed limit.

Claims

1. a jack includes cylinder body, is slidingly fitted with axle in the cylinder body; It is characterized in that: the two ends of cylinder body are separately installed with footstock, base, are set with inner core on the axle, are main oil pocket between inner core and the inboard wall of cylinder block; Be secondary oil pocket between inner core and the axle, the end of footstock is provided with chamfering, and chamfering is right against trip ring; Be slidingly fitted with the hydraulic piston bar on the base, be provided with two stabilizing rings between axle end and the base, outside stabilizing ring suit and the axle.

2. according to the said jack of claim 1, it is characterized in that: in the oil return circuit in the described base flow-limiting valve, check valve are installed.

3. according to the said jack of claim 1, it is characterized in that: described check valve is installed in the interior perforate of base with the control thimble is concentric.