CN104676243A

CN104676243A - Classified gas-inflating method for gas spring and tool for method

Info

Publication number: CN104676243A
Application number: CN201510130481.2A
Authority: CN
Inventors: 罗萍
Original assignee: Longchang Shanchuan Precision Welded Tube Co Ltd
Current assignee: Longchang Shanchuan Machinery Co.,Ltd.
Priority date: 2015-03-24
Filing date: 2015-03-24
Publication date: 2015-06-03
Anticipated expiration: 2035-03-24
Also published as: CN104676243B

Abstract

The invention discloses a classified gas-inflating method for a gas spring and tool for the method. Gas is inflated by a gap between a guide sleeve at the front end of the gas spring and a piston rod, and an air inflation hole is formed in an end cap at the rear end of the gas spring. The classified gas-inflating method is characterized in that gas is inflated in a way of multi-stage gas inflating and the gas inflating pressure is gradually raised. The tool for the classified gas-inflating method for the gas spring comprises a base, wherein a gas inflating seat and a limiting plate are correspondingly arranged on the base, a supporting block is arranged between the gas inflating seat and the limiting plate, a gas inflating chamber matched with the front end of the gas spring is formed on the gas inflating seat, sealing elements are mounted at the front and rear openings of the gas inflating chamber, a gas inlet communicated with the gas inflating chamber is formed in the gas inflating base, the gas inlet is connected with a low pressure gas source, a middle pressure gas source and a high pressure gas source through pipelines. The piston rod is just pulled out during gas inflating without being fixed, so that the production efficiency is improved. After gas inflating, the force value of the product is small in fluctuation and stable. No gas inflating holes are available in the end cap at the rear end of the gas spring, so that the quality potential quality hazard of hidden leakage is avoided.

Description

Air spring classification inflation method and frock thereof

Technical field

The invention belongs to air spring inflation technical field, particularly relate to a kind of air spring classification inflation method.

Background technique

Air spring is a kind of automotive industry accessories that can play the functions such as support, buffering, it is a kind of elastic element, its main structure comprises the parts such as cylinder barrel 5, piston rod sub-assembly, guide sleeve 2, sealing gland 3 and spacer 4, and wherein piston rod sub-assembly comprises piston rod 1 and piston, see Fig. 1.Its principle is filled with inert gas or gas mixture in airtight cylinder barrel, make the pressure in cavity higher than atmospheric several times or tens times, utilize the sectional area difference (one end is connected to piston rod and the other end does not have) of piston both sides thus produce pressure difference to realize the motion of piston rod.Owing to being provided with through hole at internal piston, piston two ends gas pressure is equal, and the sectional area of piston both sides is different, under gas pressure effect, produce the pressure (i.e. the elastic force of strut) to the little side of sectional area, the size of elastic force can by arranging different inflation pressures to realize.

On market, existing air spring inflation method is roughly divided into two kinds: front end inflation is inflated with rear end.

(1) front end inflation: high pressure nitrogen enters from the gap between the guide sleeve 2 and piston rod 1 of air spring cylinder barrel oral area, because sealing gland inner lip 6 shape is similar to one-way valve, push its inner lip 6 when high pressure nitrogen pressure is greater than sealing gland enclasping force open and enter cylinder barrel inside, reach authorized pressure and stop inflation after pressurize, complete the gas replenishment process to whole air spring, as shown in Figures 2 and 3.

The shortcoming that this front end airing form exists mainly contain following some:

A. inflation pressure will be subject to the many factors such as sealing gland and piston rod fit dimension, sealing gland lip shape, sealing gland enclasping force, and when causing gas to be filled with, linear loss is comparatively large, and not easily controls, and after causing inflation, air spring elastic force wave range comparatively greatly (± 50N).

B. inflate the initial stage, because cylinder barrel inside and outside differential pressure causes piston rod will be pressed into cylinder barrel inside, piston rod must be pulled out and fix before inflation, cause manufacturing efficiency lower.

(2) rear end inflation: offer air-filled pore on the plug 7 of air spring cylinder barrel afterbody, and in air-filled pore, assemble gas stifled 8, high pressure nitrogen blocks up 8 gaps coordinated from the air-filled pore of plug 7 with gas and enters cylinder barrel inside, authorized pressure is reached and after pressurize until it, gas is blocked up 8 expose interference parts press-in plug 7 air-filled pore in gas in cylinder barrel is sealed, complete the gas replenishment process to whole air spring, as shown in Figure 4 and Figure 5.

The shortcoming that this rear end airing form exists mainly contain following some:

A. the air-filled pore on plug and the gas be mated block up that size is little, required precision is high, cause manufacture cost high.

B. plug air-filled pore aperture is φ 1.8, and its difficulty of processing is large, not easily ensures conformity and the stability of its size, and easily produces oval at aperture place, affects the sealing effect of air spring, causes the recessiveness of gas to reveal.

C. existing technological method for processing can not ensure the roughness of plug air-filled pore internal surface, and the coarse generation gap, the face that is sealed and matched that air-filled pore and gas will be caused like this to block up, causes gas leakage.

D. existing air-supported structure is once after insufflation gas sealing, namely can not carry out supplementary gas again, cause increasing of waste product virtually.

Therefore, the direction becoming these those skilled in the art and make great efforts how is solved the problems of the technologies described above.

Summary of the invention

Object of the present invention is just to provide a kind of air spring classification inflation method and frock thereof, can solve above-mentioned the deficiencies in the prior art part completely.

Object of the present invention is realized by following technical proposals:

A kind of air spring classification inflation method, is inflated by the gap between air spring front end guide sleeve and piston rod, without air-filled pore on the plug of air spring rear end, it is characterized in that: adopt the mode of multi-stage inflatable to inflate, and inner gas pressure raises step by step.

As preferably, first the piston rod of air spring is pulled out, then to carry out in first order low inflation, the second level pressure inflation successively and the third level high-pressure aerated.

As preferably, the air pressure of described first order low inflation is 1 ~ 3MPa, and inflationtime is 1 ~ 2s; Press the air pressure of inflation to be 3 ~ 10MPa in the second level, inflationtime is 2 ~ 5s; The high-pressure aerated air pressure of the third level is 10 ~ 20MPa, and inflationtime is 2 ~ 4s.

A kind of frock for above-mentioned air spring classification inflation method, comprise base, on base, correspondence arranges inflating seat and limiting board, support block is provided with between inflating seat and limiting board, described inflating seat is offered the plenum chamber for mating with air spring front end, and at plenum chamber front and back end ports place, Sealing is installed, inflating seat is offered the suction port be communicated with plenum chamber, suction port connects low-pressure gas source, middle pressurized air source and high-pressure air source respectively by pipeline.

Compared with prior art, beneficial effect of the present invention is:

1. only need pull out piston rod when inflating, not needing to fix, improve manufacturing efficiency.

2. after inflation, product force value fluctuates little (± 20N), stablizes.

3., without air-filled pore on the plug of air spring rear end, stopped the hidden danger of quality that plug air-filled pore place recessiveness is revealed.

4. reduce product purchasing cost.

5. can carry out supplementary gas by the product little to force value, reduce reject rate, saved cost of goods manufactured.

Accompanying drawing explanation

Fig. 1 is the structural representation of prior art air spring;

Fig. 2 is the structural representation of air spring front end inflation;

Fig. 3 is the partial enlarged drawing at A place in Fig. 2;

Fig. 4 is the structural representation of air spring rear end inflation;

Fig. 5 is that air spring rear end has been inflated, and gas blocks up the structural representation after press-in plug;

Fig. 6 is that air spring of the present invention is fixed on structural representation frock being carried out multi-stage inflatable.

Embodiment

Below in conjunction with specific embodiments and the drawings, the present invention is further illustrated.

Concrete steps are as follows:

Step one, first pulls out the piston rod of air spring, is fixed on Aerated tool equipment by air spring, and the front end of air spring is placed in the plenum chamber of Aerated tool equipment;

Step 2, carries out first order low inflation, and air pressure is 1 ~ 3MPa, and inflationtime is 1 ~ 2s;

Step 3, carry out pressure inflation in the second level, air pressure is 3 ~ 10MPa, and inflationtime is 2 ~ 5s;

Step 4, it is high-pressure aerated to carry out the third level, and air pressure is 10 ~ 20MPa, and inflationtime is 2 ~ 4s.

At the inflation initial stage of above-mentioned classification gas replenishment process, cylinder barrel external pressure is higher than air pressure inside, and due to input is low-pressure gas, and piston rod is slowly pressed into cylinder barrel inside; Meanwhile, cylinder barrel air pressure inside can be made rapidly higher than external pressure by the continuous input of low-pressure gas, when piston rod is not also pressed into cylinder barrel inside completely, piston rod be released, to ensure that in follow-up gas replenishment process, piston rod can not be pressed into cylinder barrel inside.In the mid-term of gas replenishment process, need the input of that have certain pressure, enough medium pressure gas, the gas pressure wave range that such guarantee is filled with cylinder barrel inside is little, stable, high-pressure aeratedly establishes a stable good basis to follow-up.In inflation latter stage, had in cylinder barrel inside enough and had on the basis of certain pressure and be filled with pressurized gas further again, pressure reduction is less comparatively speaking, and gas pressure input is more quick, stable, thus ensures to have inflated stablizing of rear product force value.

It is low that the method that this classification is inflated solves traditional air spring front end inflation manufacturing efficiency, the problem that product force value wave range is large.Concretely, only need pull out piston rod when inflating, not needing to fix, therefore improve manufacturing efficiency.After inflation, the fluctuation of product force value is little and stable.Without air-filled pore on the plug of air spring rear end, stop the hidden danger of quality that plug air-filled pore place recessiveness is revealed. sealing gland due to air spring is one-way valve structures, when product force value hour, again inflates after can adjusting parameter, namely pushes sealing gland inner lip open and makes gas enter cylinder barrel inside until product force value meets the requirements.

Shown in Figure 6, a kind of frock for above-mentioned air spring classification inflation method, comprise base 101, on base 101, correspondence arranges inflating seat 102 and limiting board 103, support block 104 is provided with between inflating seat 102 and limiting board 103, described inflating seat 102 is offered the plenum chamber 105 for mating with air spring front end, and at plenum chamber 105 front and back end ports place, Sealing 106 is installed, inflating seat 102 is offered the suction port 107 be communicated with plenum chamber 105, suction port 107 connects low-pressure gas source 108, middle pressurized air source 109 and high-pressure air source 110 respectively by pipeline.

In use, the piston rod of air spring 200 is pulled out, the front end of air spring 200 is placed in the plenum chamber 105 of inflating seat 102, Sealing 106 and air spring 200 fitted seal at plenum chamber 105 front and back end ports place, make to form a confined space in plenum chamber 105, supported by support block 104 bottom air spring 200, air spring 200 afterbody is undertaken spacing by limiting board 103, and now air spring 200 is fixed in frock.Then, open low-pressure gas source 108 pairs of air springs 200 and carry out first order low inflation, closedown low-pressure gas source 108 after completing; In unlatching, pressurized air source 109 pairs of air springs 200 carry out pressure inflation in the second level, pressurized air source 109 in closedown after completing; Finally, it is high-pressure aerated that unlatching high-pressure air source 110 pairs of air springs 200 carry out the third level, closedown high-pressure air source 110 after completing.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims

1. an air spring classification inflation method, is inflated by the gap between air spring front end guide sleeve and piston rod, without air-filled pore on the plug of air spring rear end, it is characterized in that: adopt the mode of multi-stage inflatable to inflate, and inner gas pressure raises step by step.

2. air spring classification inflation method according to claim 1, is characterized in that: first pulled out by the piston rod of air spring, then to carry out in first order low inflation, the second level pressure inflation successively and the third level high-pressure aerated.

3. air spring classification inflation method according to claim 2, is characterized in that: the air pressure of described first order low inflation is 1 ~ 3MPa, and inflationtime is 1 ~ 2s; Press the air pressure of inflation to be 3 ~ 10MPa in the second level, inflationtime is 2 ~ 5s; The high-pressure aerated air pressure of the third level is 10 ~ 20MPa, and inflationtime is 2 ~ 4s.

4. the frock for air spring classification inflation method described in any one of the claims 1-3, it is characterized in that: comprise base, on base, correspondence arranges inflating seat and limiting board, support block is provided with between inflating seat and limiting board, described inflating seat is offered the plenum chamber for mating with air spring front end, and at plenum chamber front and back end ports place, Sealing is installed, inflating seat is offered the suction port be communicated with plenum chamber, suction port connects low-pressure gas source, middle pressurized air source and high-pressure air source respectively by pipeline.