CN208537128U - A kind of exciting force frequency range adjustable pneumatic vibration excitor - Google Patents
A kind of exciting force frequency range adjustable pneumatic vibration excitor Download PDFInfo
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- CN208537128U CN208537128U CN201821099112.7U CN201821099112U CN208537128U CN 208537128 U CN208537128 U CN 208537128U CN 201821099112 U CN201821099112 U CN 201821099112U CN 208537128 U CN208537128 U CN 208537128U
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Abstract
The utility model relates to a kind of exciting force frequency range adjustable pneumatic vibration excitors, including cylinder barrel, piston, backing metal, nonmetallic cushion block and end cap.The cylinder barrel front end has inclined end face, and inclined end face is provided with counterbore；Cylindrical cavity, the closing of cavity front end, rear end perforation are opened up inside cylinder barrel.The piston is located in rear cavity portion, and piston is in three sections of graded axial types, and radial dimension is sequentially increased from front to back.The backing metal is located at preceding cavity portion front end, forms clearance fit with preceding cavity portion inner wall.Nonmetallic cushion block is located at preceding cavity portion rear end, abuts backing metal rear end, is similarly formed clearance fit with preceding cavity portion inner wall.The end cap is located at the rear end face of cylinder barrel, is fixed on the rear end face of cylinder barrel by four screws.It is adjustable that Pneumatic vibration exciter is designed as frequency range by the utility model, and exciting force spectrum distribution can be adjusted according to different tests demand, has preferably ensured the validity and reasonability of Reliability Enhancement Testing.
Description
Technical field
The utility model relates to a kind of exciting force frequency range adjustable pneumatic vibration excitors, are applied to Reliability Enhancement Testing system
System preferably ensures the validity and reasonability of Reliability Enhancement Testing.
Background technique
Reliability Enhancement Testing is a kind of novel reliability test skill risen in western developed country the 1990s
Art.It is to apply environmental stress in the product development stage to product using the method for stepping and detect its performance, until product loses
Until effect, to obtain product design nargin and ultimate bearing capacity (destruction or damage limit).Original is needed to spend by this test method
6 months even 1 year new product reliability tests of expense foreshorten to one week, can efficiently solve modern electronic product high reliability,
Contradiction between short lead time and low development cost, external Reliability Engineering circle is as the important guarantee of product reliability
One of means are widely used to the neck such as communication, electronics, computer, medical treatment, the energy, traffic, aerospace and military affairs at present
Domain achieves immense success.
The remarkable result of reliability Enhancement Test is other than from its advanced test theory, it is necessary to rely on height
The equipment of effect, traditional electric vibration table pumping signal is uniaxial gaussian signal, and Reliability Enhancement Testing requires exciting letter
Number be holoaxial super-Gaussian random vibration, it is therefore desirable to research and develop novel testing equipment.At present both at home and abroad in Reliability Enhancement Testing
In mainly use a kind of pneumatic Reliability Enhancement Testing system, the enhancement stress environment which provides pneumatic is swashed by multiple
Vibration device strikes table top to realize repeatedly, realizes simply, low in cost, is widely used.
Power source of the Pneumatic vibration exciter as pilot system is the most important component part of whole system, external at present
There are the related patents product of oneself in the companies such as Hanse and QualMark, but the distribution of its excitation force frequency is all that fixation can not
It adjusts.Domestic correlative study also predominantly stays in theoretic, and shortcoming is also compared in actual design application.
Summary of the invention
(1) technical problems to be solved
In view of the deficiency of the prior art, the utility model proposes a kind of exciting force frequency range adjustable pneumatic excitings
Device determines the factor for influencing pneumatic exciting force spectrum distribution by theory analysis, and it is adjustable that Pneumatic vibration exciter is designed as frequency range,
It can adjust exciting force spectrum distribution according to different tests demand, preferably ensured Reliability Enhancement Testing validity and
Reasonability.
(2) technical solution
A kind of exciting force frequency range adjustable pneumatic vibration excitor, including cylinder barrel, piston, backing metal, nonmetallic cushion block and end
Lid；The cylinder barrel front end has inclined end face, and inclined end face is provided with counterbore；Cylindrical cavity is opened up inside cylinder barrel,
Cavity front end closing, rear end perforation, and its front end radial dimension be less than rear end radial dimension, the cavity be divided into before cavity portion and
Cavity portion afterwards, preceding cavity portion and rear cavity portion coaxially share the first axial line；Cavity portion side wall is equipped with former and later two ports afterwards,
Front end port is exhaust outlet, and rear end port is air inlet；It is located at preceding cavity portion rear end on cavity portion inner wall afterwards and is equipped with the first ring
Shape slot corresponds on rear cavity portion inner wall and is respectively equipped with the second annular groove and third annular groove at the position of exhaust outlet and air inlet,
Rear cavity portion inner wall is divided into three sections by first annular slot, the second annular groove and third annular groove, respectively the first inner wall,
The radial dimension of two inner walls and third inner wall, the first inner wall and the second inner wall is identical and respectively less than third inner wall
Radial dimension.
Wherein, the piston is located in rear cavity portion, and piston is in three sections of graded axial types, and radial dimension successively increases from front to back
Greatly, respectively the first ladder shaft part, the second ladder shaft part and third ladder shaft part；Piston has the second axial line, the second axle center
Line coincides with the first axial line；The center in piston rear end face extends to form forward the first blind hole, and in the first blind hole side
Wall extends radially into two first through hole of formation, first blind hole and described two first through hole on the second ladder shaft part end face
The first airflow channel is formed, piston nose face position on the lower side extends rearwardly to form the second blind hole, and radial in the second blind hole side wall
It extends on the second ladder shaft part end face and forms the second through-hole, second blind hole and second through-hole form the second air-flow and lead to
Road, the first airflow channel and the second airflow channel are alternately connected with air inlet, realize past in cavity portion after the cylinder barrel of piston
Linear motion.
Wherein, the backing metal is located at preceding cavity portion front end, forms clearance fit with preceding cavity portion inner wall；Non-metallic pad
Block is located at preceding cavity portion rear end, abuts backing metal rear end, is similarly formed clearance fit with preceding cavity portion inner wall.
Wherein, the end cap is located at the rear end face of cylinder barrel, is fixed on the rear end face of cylinder barrel by four screws, end cap and cylinder
The end face that tube rear end face is in contact is equipped with annular groove, and mounting O-shaped sealing ring carries out static seal in annular groove.
Wherein, balancing slit is distributed on the outer surface of the third ladder shaft part of piston.
Wherein, the material of cylinder barrel and end cap is extra super duralumin alloy, and piston material is No. 45 steel, and inner wall of cylinder carries out surface sun
Polarization process, outer surface of piston is using quenching and chromium plating process.
Wherein, the first threaded hole and the second threaded hole is respectively set in backing metal and nonmetallic cushion block inner hub location,
In order to the installation and removal of backing metal and nonmetallic cushion block.
Wherein, logical corresponding to two screw threads are symmetrically arranged at nonmetallic cushion block axial centre position on the side wall of preceding cavity portion
A holding screw, the fixation for nonmetallic cushion block are respectively installed in two tapped through holes in hole.
Wherein, the second ladder shaft part and the second inner wall form clearance fit, third ladder shaft part and third inner wall shape
At clearance fit, to form metal gap sealing.
(3) beneficial effect
1, by the way that balancing slit is rationally arranged on piston third ladder shaft part outer wall, make the fit clearance between piston and cylinder barrel
It is more uniform, it ensure that the exciting stationarity and service life of Pneumatic vibration exciter.
2, by the way that cushion block is designed to backing metal and nonmetallic cushion block two parts, and metal and nonmetallic cushion block are designed
At the structure for facilitating assembly and disassembly to replace, by the material and relative length that change backing metal and nonmetallic cushion block, so that it may so that this
The exciting force frequency range of kind Pneumatic vibration exciter is adjusted, and more flexible can adapt to the different exciting of Reliability Enhancement Testing needs
It asks.
Detailed description of the invention
A kind of exciting force frequency range adjustable pneumatic vibration excitor schematic diagram and piston of Fig. 1 the utility model run initial position
Figure.
The portion A partial enlarged view in Fig. 2 Fig. 1.
Fig. 3 piston is in schematic diagram at first position.
Fig. 4 piston is in second place schematic diagram.
Fig. 5 piston is in schematic diagram at the third place.
Specific embodiment
Referring to Fig.1, a kind of exciting force frequency range adjustable pneumatic vibration excitor of the utility model, including cylinder barrel 1, piston 2, gold
Belong to cushion block 3, nonmetallic cushion block 4 and end cap 5.
Cylinder barrel 1, front end have inclined end face 21, inclined end face 21 are provided with counterbore 22.It is opened up inside cylinder barrel 1
Cylindrical cavity 11, the closing of 11 front end of cavity, rear end perforation, and its front end radial dimension is less than rear end radial dimension, the sky
Chamber 11 divides for preceding cavity portion 9 and rear cavity portion 10, and preceding cavity portion 9 and rear cavity portion 10 coaxially share the first axial line 31.It is empty afterwards
10 side wall of cavity portion is equipped with former and later two ports, and front end port is exhaust outlet 19, and rear end port is air inlet 20.Cavity portion 10 afterwards
It is located at preceding 9 rear end of cavity portion on inner wall and is equipped with first annular slot 12, corresponds to exhaust outlet 19 and air inlet on rear 10 inner wall of cavity portion
It is respectively equipped with the second annular groove 13 and third annular groove 14 at mouthfuls 20 position, first annular slot 12, the second annular groove 13 and the
Rear 10 inner wall of cavity portion is divided into three sections by three annular grooves 14, in respectively the first inner wall 15, the second inner wall 16 and third
Wall surface 17, the first inner wall 15 is identical with the radial dimension of the second inner wall 16 and the radial ruler of respectively less than third inner wall 17
It is very little.
Piston 2 is located in rear cavity portion 10, and piston 2 is in three sections of graded axial types, and radial dimension is sequentially increased from front to back,
Respectively the first ladder shaft part 23, the second ladder shaft part 24 and third ladder shaft part 25.Piston 2 has the second axial line 32, the
Two axial lines 32 coincide with the first axial line 31.The center of 2 rear end face of piston extends to form forward the first blind hole, and
First blind hole side wall extends radially on 24 end face of the second ladder shaft part two first through hole of formation, first blind hole and described
Two first through hole form the first airflow channels 27, and 2 front end face of piston position on the lower side extends rearwardly to form the second blind hole, and the
Two blind hole side walls extend radially into and form the second through-hole on 24 end face of the second ladder shaft part, and second blind hole and described second is led to
Hole forms the second airflow channel 26, and the first airflow channel 27 and the second airflow channel 26 are alternately connected with air inlet 20, realize
Linear reciprocating motion after 2 cylinder barrel 1 of piston in cavity portion 10.
Backing metal 3 is located at preceding 9 front end of cavity portion, forms clearance fit with preceding 9 inner wall of cavity portion.The clearance fit
For H8/h7.
Nonmetallic cushion block 4 is located at preceding 9 rear end of cavity portion, abuts 3 rear end of backing metal, shape same as preceding 9 inner wall of cavity portion
At clearance fit.The clearance fit is H8/h7.
End cap 5 is fixed on the rear end face of cylinder barrel 1 positioned at the rear end face of cylinder barrel 1 by four screws 7, end cap 5 and cylinder barrel 1
The end face that rear end face is in contact is equipped with annular groove 30, and mounting O-shaped sealing ring 6 carries out static seal in annular groove 30.
Referring to Fig. 2, reasonable layout has balancing slit 33 on the outer surface of the third ladder shaft part 25 of piston 2, can make to press
Contracting air is circumferentially distributed more uniform, guarantees the uniformity of fit clearance, makes fortune of the piston 2 in the rear cavity portion 10 of cylinder barrel 1
Row is more steady reliable.
The material of above-mentioned cylinder barrel 1 and end cap 5 is extra super duralumin alloy, and 2 material of piston is No. 45 steel, and 1 inner wall of cylinder barrel carries out
Surface anodization processing, 2 outer surface of piston are matched using quenching and chromium plating process by being surface-treated measure accordingly and can be improved
The hardness in conjunction face enhances wearability, to extend Pneumatic vibration exciter service life.
The first threaded hole 28 and the second spiral shell is respectively set in above-mentioned backing metal 3 and 4 inner hub location of nonmetallic cushion block
Pit 29, in order to the installation and removal of backing metal 3 and nonmetallic cushion block 4, to pass through replacement different materials and relative length
Backing metal 3 and nonmetallic cushion block 4 realize the adjustment of the exciting force frequency range of Pneumatic vibration exciter.
Correspond at nonmetallic 4 axial centre position of cushion block in the present embodiment, on the side wall of preceding cavity portion 9 and is symmetrically arranged with two
A tapped through hole 18 respectively installs a holding screw 8 in two tapped through holes 18, for the fixation of nonmetallic cushion block 4, prevents from living
When plug 2 hits nonmetallic cushion block 4 repeatedly, nonmetallic cushion block 4 falls off.
In the present embodiment, the clearance fit of the second ladder shaft part 24 and the second inner wall 16 formation H6/g5, third multi-diameter shaft
Section 25 and third inner wall 17 form the clearance fit of H6/g5, to form metal gap sealing.Reducing compressed air leakage
While amount, reduce frictional resistance, can guarantee the reciprocating motion of the piston long-term high frequency in the rear cavity portion.
The course of work of the Pneumatic vibration exciter is illustrated below:
The Pneumatic vibration exciter operation phase one:
Referring to Fig.1, Fig. 3, initially, piston 2 are contacted with end cap 5 under the effect of gravity.When air inlet 20 is passed through compressed air
When, compressed air can enter the first airflow channel 27 by third annular groove 14, and then enter the gap of piston 2 and end cap 5
In, forward thrust is generated to piston 2.The air in 2 front end air cavity of piston can directly be flowed out from exhaust outlet 19 simultaneously, piston
2 front ends are always by atmospheric pressure, and therefore, piston 2 does forward the movement that acceleration is gradually increased under force action, until operation
To at first position shown in Fig. 3.
The Pneumatic vibration exciter operation phase two:
Referring to Fig. 3, Fig. 4, when 2 Accelerating running of piston starts to first position shown in Fig. 3, the first airflow channel 27 is by the
The closing of two inner walls 16, compressed air can not be supplemented the gap into piston 2 and end cap 5, the air pressure of piston 2 from this position
Motive force is gradually reduced, therefore the movement that acceleration is gradually reduced is done forward in the beginning of piston 2, until running to shown in Fig. 4 the
At two positions.
The Pneumatic vibration exciter operation phase three:
Referring to Fig. 4, Fig. 5, start when piston 2 runs to the second position shown in Fig. 4, the first airflow channel 27 starts and the
Second ring slot 13 is connected to, and air inlet 20 is still closed at this time, and rear air cavity compressed air is through the first airflow channel 27 and the second ring
Shape slot 13 flows out exhaust outlet 19, and preceding air cavity is formed by metal gap sealing surface by the first inner wall 15 and the second ladder shaft part 24
It is closed, the rear end pressure of piston 2 reduces front end air pressure simultaneously and increases from this position, further decreases with joint efforts, therefore piston 2
Start to do the smaller accelerated motion of acceleration forward, until running at the third place shown in fig. 5.
The Pneumatic vibration exciter operation phase four:
Referring to Fig. 5, Fig. 4, start when piston 2 runs to the third place shown in fig. 5, piston 2 and nonmetallic 4 end face of cushion block
It collides, generates exciting force, propagated forward in the form of wave, compressed air is pressed after the exhaust of exhaust outlet 19 in rear air cavity at this time
Power decline, air inlet 20 are connected to the second airflow channel 26, and compressed air enters preceding air cavity, and preceding air cavity pressure rises, therefore living
Plug 2 hit bounce and front and back chamber atmospheric pressure it is poor under the action of Accelerating running backward, until back to the second position shown in Fig. 4
Place.
The Pneumatic vibration exciter operation phase five:
Referring to Fig. 4, Fig. 3, when piston 2 starts back to the second position shown in Fig. 4, preceding air cavity pressure is not further added by, at this time
Compressed air cannot be discharged in air cavity afterwards, and as piston 2 moves backward, ante-chamber atmospheric pressure reduces, and back cavity atmospheric pressure increases, piston
2 backward acceleration of motion be gradually reduced, until back at first position shown in Fig. 3.
The Pneumatic vibration exciter operation phase six:
Referring to Fig. 3, Fig. 1, when piston 2 starts back to first position shown in Fig. 3, air inlet 20 start again with the first gas
Circulation road 27 is connected to, and compressed air enters back cavity, and back cavity atmospheric pressure further increases, preceding air cavity pressure through exhaust outlet 19 under
It drops to close to atmospheric pressure, piston 2 does the increasing retarded motion of acceleration backward at this time, until speed is reduced to zero, at this time
Piston 2 completes the reciprocating motion of a cycle, and Pneumatic vibration exciter generates monocycle impulse excitation power, and then piston 2 starts new one
The reciprocating motion in period so constantly back and forth makes Pneumatic vibration exciter generate periodic impulse excitation power.
Claims (9)
1. a kind of exciting force frequency range adjustable pneumatic vibration excitor, including cylinder barrel, piston, backing metal, nonmetallic cushion block and end cap；
It is characterized in that, the cylinder barrel front end has inclined end face, inclined end face is provided with counterbore；Cylinder is opened up inside cylinder barrel
Shape cavity, the closing of cavity front end, rear end perforation, and its front end radial dimension is less than rear end radial dimension, before the cavity is divided into
Cavity portion and rear cavity portion, preceding cavity portion and rear cavity portion coaxially share the first axial line；Cavity portion side wall is equipped with front and back afterwards
Two ports, front end port are exhaust outlet, and rear end port is air inlet；It is located on cavity portion inner wall at preceding cavity portion rear end afterwards and sets
There is first annular slot, is corresponded on rear cavity portion inner wall and be respectively equipped with the second annular groove and third at the position of exhaust outlet and air inlet
Rear cavity portion inner wall is divided into three sections by annular groove, first annular slot, the second annular groove and third annular groove, in respectively first
The radial dimension of wall surface, the second inner wall and third inner wall, the first inner wall and the second inner wall is identical and respectively less than third
The radial dimension of inner wall.
2. a kind of exciting force frequency range adjustable pneumatic vibration excitor as described in claim 1, which is characterized in that the piston is located at
Afterwards in cavity portion, piston is in three sections of graded axial types, and radial dimension is sequentially increased from front to back, respectively the first ladder shaft part, the
Two ladder shaft parts and third ladder shaft part；Piston has the second axial line, and the second axial line coincides with the first axial line；Piston
The center of rear end face extends to form forward the first blind hole, and extends radially into the second ladder shaft part end in the first blind hole side wall
Two first through hole are formed on face, first blind hole and described two first through hole form the first airflow channel, piston nose
Face position on the lower side extends rearwardly to form the second blind hole, and extends radially into shape on the second ladder shaft part end face in the second blind hole side wall
At the second through-hole, second blind hole and second through-hole form the second airflow channel, the first airflow channel and the second air-flow
Channel is alternately connected with air inlet, realizes the linear reciprocating motion after the cylinder barrel of piston in cavity portion.
3. a kind of exciting force frequency range adjustable pneumatic vibration excitor as claimed in claim 2, which is characterized in that the backing metal
Positioned at preceding cavity portion front end, clearance fit is formed with preceding cavity portion inner wall；Nonmetallic cushion block is located at preceding cavity portion rear end, abuts
Backing metal rear end is similarly formed clearance fit with preceding cavity portion inner wall.
4. a kind of exciting force frequency range adjustable pneumatic vibration excitor as claimed in claim 3, which is characterized in that the end cap is located at
The rear end face of cylinder barrel is fixed on the rear end face of cylinder barrel by four screws, is set on the end face that end cap is in contact with cylinder barrel rear end face
There is annular groove, mounting O-shaped sealing ring carries out static seal in annular groove.
5. a kind of exciting force frequency range adjustable pneumatic vibration excitor as claimed in claim 2, which is characterized in that the third rank of piston
Balancing slit is distributed on the outer surface of terraced shaft part.
6. a kind of exciting force frequency range adjustable pneumatic vibration excitor as described in claim 1, which is characterized in that cylinder barrel and end cap
Material is extra super duralumin alloy, and piston material is No. 45 steel, and inner wall of cylinder carries out surface anodization processing, and outer surface of piston, which uses, to be quenched
Fire and chromium plating process.
7. a kind of exciting force frequency range adjustable pneumatic vibration excitor as described in claim 1, which is characterized in that backing metal and non-
The first threaded hole and the second threaded hole is respectively set in backing metal inner hub location, in order to backing metal and nonmetallic cushion block
Installation and removal.
8. a kind of exciting force frequency range adjustable pneumatic vibration excitor as described in claim 1, which is characterized in that the side of preceding cavity portion
Correspond at nonmetallic cushion block axial centre position on wall and be symmetrically arranged with two tapped through holes, respectively installs one in two tapped through holes
A holding screw, the fixation for nonmetallic cushion block.
9. a kind of exciting force frequency range adjustable pneumatic vibration excitor as described in claim 1, which is characterized in that the second ladder shaft part
Clearance fit is formed with the second inner wall, third ladder shaft part and third inner wall form clearance fit, to be formed between metal
Gap sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821099112.7U CN208537128U (en) | 2018-07-12 | 2018-07-12 | A kind of exciting force frequency range adjustable pneumatic vibration excitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821099112.7U CN208537128U (en) | 2018-07-12 | 2018-07-12 | A kind of exciting force frequency range adjustable pneumatic vibration excitor |
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|---|---|
| CN208537128U true CN208537128U (en) | 2019-02-22 |
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| CN201821099112.7U Active CN208537128U (en) | 2018-07-12 | 2018-07-12 | A kind of exciting force frequency range adjustable pneumatic vibration excitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562417A (en) * | 2018-07-12 | 2018-09-21 | 北京航天希尔测试技术有限公司 | A kind of exciting force frequency range adjustable pneumatic vibrator |
-
2018
- 2018-07-12 CN CN201821099112.7U patent/CN208537128U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562417A (en) * | 2018-07-12 | 2018-09-21 | 北京航天希尔测试技术有限公司 | A kind of exciting force frequency range adjustable pneumatic vibrator |
| CN108562417B (en) * | 2018-07-12 | 2024-02-27 | 北京航天希尔测试技术有限公司 | Pneumatic vibration exciter with adjustable exciting force frequency band |
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