CN102074228B - Pneumatic small-ball random vibration generator - Google Patents
Pneumatic small-ball random vibration generator Download PDFInfo
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- CN102074228B CN102074228B CN2010105273469A CN201010527346A CN102074228B CN 102074228 B CN102074228 B CN 102074228B CN 2010105273469 A CN2010105273469 A CN 2010105273469A CN 201010527346 A CN201010527346 A CN 201010527346A CN 102074228 B CN102074228 B CN 102074228B
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- housing
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- vibration generator
- bead
- random vibration
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Abstract
The invention discloses a pneumatic small-ball random vibration generator, comprising a housing and small collision balls; wherein the housing is of a hollow flat cylinder shape with two sealed ends; the flat cylindrical hollow cavity of the housing forms a collision chamber; the side wall surface of the housing is provided with one air inlet hole and a plurality of air outlet holes; the small collision balls are loaded in the collision chamber; and the volume sum of the small collision balls accounts for 15-25% of the volume of the collision chamber. The pneumatic small-ball random vibration generator can effectively control and reduce the line spectrum signal-to-noise ratio of each frequency band, and has the advantages of small volume, simple structure design, convenience for mounting, operation and control, and the like; and different power spectrums can be obtained by changing the system parameters as required.
Description
Technical field
The present invention relates to a kind of vibration machine, particularly relate to a kind of pneumatic bead random vibration generator.Belong to reciprocating machine ground unrest generating means field.
Background technology
No matter be our daily life or commercial production, all can relate to some can vibrative equipment, for example, and motor car engine, washing machine, machine motor or the like.These equipment are because itself intrinsic intrinsic propesties, when work, all can produce the vibration with certain rule and the sound of fixed frequency.These vibrations and sound have constituted the intrinsic dynamic perfromance of these equipment.
On the contrary, be accompanied by the fundamental vibration of plant equipment, exist the ground unrest that comes from the plant equipment outside in a large number toward contact.The existence of these noises will inevitably produce certain interference to the mechanical vibration that we paid close attention to.The energy of ground unrest is bigger, and is just difficult further for the information extraction of mechanical proper vibration.At present, the research about the ground unrest of mechanical vibration has also caused increasing concern gradually.
Based on a such problem background, we study and have invented this patent: pneumatic bead random vibration generator, the ground unrest vibration when being used for artificial simulation mechanical vibration.The advantage of this device is: can pass through the adjusting to the adjustable parameter of this device, change the characteristic of ground unrest within the specific limits, produce the specific ground unrest that research needs.And also have principle simple, and install small and exquisitely, operate advantages such as easy for installation.
Summary of the invention
The object of the present invention is to provide a kind of pneumatic bead random vibration generator that can control and reduce various reciprocating machine characteristic line spectrum signal to noise ratio (S/N ratio)s effectively.
The object of the invention is achieved through following technical scheme.
A kind of pneumatic bead random vibration generator; It is characterized in that: it comprises housing and collision bead; Said housing is the hollow oblate column of closed at both ends; The oblate column hollow cavity of housing constitutes collision cell, and the case side wall has an air admission hole and a plurality of venthole, and said collision bead is contained in the collision cell.
Make the collision locular wall collision of bead and this vibration generator produce vibration, the gas of air admission hole will have certain pressure.Seek out stable power spectrum, it is stable that the pressure values of air admission hole also must keep.Evidence, there is a minimum working value 0.1MPa in the air pressure of input, and the atmospheric pressure value that promptly has only input gas just can evoke stable random vibration during greater than 0.1MPa.Along with the increase of stablizing the input air pressure value, the amplitude of each frequency band of random vibration also increases thereupon synchronously, and power spectrum curve remains unchanged.
When the input air pressure value keeps certain, the vibrational energy of system again with collision cell in bead quantity (or volume ratio of all beads and collision cell) maintenance relevant.Owing to receive the constraint in the space of gas flow rate and collision cell, within the specific limits, the energy of vibration is along with bead quantity increases and increases; After the bead number was increased to a certain degree, because free space is too narrow and small in the collision cell, most of energy of bead just consumed on phase mutual friction between the spheroid and collision.Therefore the bead quantity in the collision cell exists the vibration that an optimal value can make system under certain air pressure input, produce ceiling capacity.
When the experiment proof should account for the 15-25% of collision cell volume when the volume sum of collision bead, the average power of vibration often reached maximal value.So the volume ratio of collision bead should be chosen in this interval.
In addition, the input air pressure value can well be controlled the power of output vibration.Under testing laboratory's condition, be the linear growth relation between the two basically, promptly atmospheric pressure value is big more, and the average power that obtains is also just big more.
Said each venthole has identical size.
Said air admission hole diameter is greater than the venthole diameter.
The center of circle of said air admission hole and venthole is all on the side wall surface of housing sustained height.
The center of circle of said air admission hole and venthole is all on the side wall surface of housing middle part sustained height.
Said venthole is evenly distributed on the side wall surface of housing sustained height.
For ease of changing the collision bead in the collision cell, said housing upper surface is a removable cover, has the installation screw on the corresponding position between removable cover and the housing, and screw screw-in screw closely links together removable cover and housing.
Said air admission hole is horizontal-extending one admission piece outside housing.
Said admission piece and housing are one-body molded.
Said housing is an aluminium casing, and density is 2.69g/cm
3
Said collision bead is a polypropylene pellets, and density is 0.92g/cm
3The mechanical property of material: crystallinity is high, compound with regular structure, thereby have excellent mechanical property.Its intensity and hardness, elasticity are all than higher, and the molecular structure regularity of itself is high, and when molecular weight increased, impact strength also increased, and is more satisfactory collision impact material.
The radius of said housing is 65-80mm, and the radius of collision cell is 55-75mm, and housing sidewall thickness is 10-15mm; The venthole diameter is 2-3.5mm, and the air admission hole diameter is 6-8mm, and housing upper surface thickness is 4-6mm; Housing lower surface thickness is 2.5-3.5mm; The housing height is 360-400mm, and the mouth wall thickness of admission piece is 2.5-3.5mm, and the diameter of said collision bead is 10-19.028mm.
Compared with prior art, pneumatic bead random vibration generator of the present invention is placed the collision bead of some in the collision cell of generator during work, insert the steady air flow of certain pressure intensity at air inlet position.Open air intake valve, steady air flow will drive the collision bead and in collision cell, do random random motion, just can produce comparatively stable wide-band vibration with the collision of collision cell locular wall.The line spectrum signal to noise ratio (S/N ratio) of each frequency band can not only controlled and reduce to this pneumatic bead random vibration generator effectively; It is little also to have volume; Structural design is simple; Plurality of advantages such as fitting operation control is convenient, the parameter (volume ratio of bead in the collision cell, little bulb diameter and input air pressure value) that can change system as required obtains the different power spectrum.
Description of drawings
Fig. 1 is the structural representation of pneumatic bead random vibration generator of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Installation site synoptic diagram when Fig. 3 is pneumatic bead random vibration generator work of the present invention;
The exemplary power collection of illustrative plates of the random vibration that pneumatic bead random vibration generator produced under certain condition when Fig. 4 was work.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further described.
Structure is the structural representation of pneumatic bead random vibration generator of the present invention shown in Fig. 1-2; It comprises aluminium casing 1 and a plurality of polypropylene collision beads; Said housing 1 is the hollow oblate column of closed at both ends; The oblate column hollow cavity of housing 1 constitutes collision cell 2, and housing 1 side wall surface has an air admission hole 3 and a plurality of ventholes 4, and said collision bead is contained in the collision cell 2; The center of circle of said air admission hole 3 and venthole 4 is all on the side wall surface of housing 1 middle part sustained height; Said venthole 4 is evenly distributed on the housing 1; Said each venthole 4 has identical size; Said air admission hole 3 is horizontal-extending one admission piece 5 outside housing 1; Said admission piece 5 is one-body molded with housing 1; For ease of changing the collision bead in the collision cell 2, said housing 1 upper surface is a removable cover 6, has on the corresponding position between removable cover 6 and the housing 1 screw 7 is installed, and screw screw-in screw 7 closely links together removable cover 6 and housing 1; The volume sum of described collision bead accounts for the 15-25% of collision cell volume; The radius of said housing 1 is 72.5mm, and the radius of collision cell is 62.5mm, and housing 1 sidewall thickness is 10mm; Venthole 4 diameters are 3mm, and air admission hole 3 diameters are 7mm, and housing 1 upper surface thickness is 5mm; Housing 1 lower surface thickness is 3mm; Housing 1 highly is 380mm, and the mouth wall thickness of admission piece 5 is 3mm, and the diameter of said collision bead is 15.875mm.
During work, in collision cell, place 35 collision bead (35 X Φ 15.875), then pneumatic bead random vibration generator is placed in the position between isolation mounting (air spring) and the basis, as shown in Figure 3.Insert the steady air flow (input air pressure: 0.3MPa) of certain pressure intensity at the admission piece place.Open air intake valve, steady air flow will drive the collision bead and in collision cell, do random random motion, just can produce comparatively stable wide-band vibration with the collision of collision cell locular wall, and is as shown in Figure 4.
The present invention is not limited to above embodiment, so long as the scheme of mentioning in this instructions and claims all can be implemented.
Claims (9)
1. pneumatic bead random vibration generator; It is characterized in that: it comprises housing and collision bead; Said housing is the hollow oblate column of closed at both ends; The oblate column hollow cavity of housing constitutes collision cell, and the case side wall has an air admission hole and a plurality of venthole, and said collision bead is contained in the collision cell; It is stable that the pressure values of air admission hole keeps, and the atmospheric pressure value of input gas is greater than 0.1MPa;
The volume sum of said collision bead accounts for the 15-25% of collision cell volume.
2. pneumatic bead random vibration generator according to claim 1, it is characterized in that: said each venthole has identical size, and said air admission hole diameter is greater than the venthole diameter.
3. pneumatic bead random vibration generator according to claim 2, it is characterized in that: said venthole is evenly distributed on the side wall surface of housing sustained height.
4. pneumatic bead random vibration generator according to claim 3, it is characterized in that: the center of circle of said air admission hole and venthole is all on the side wall surface of housing sustained height.
5. pneumatic bead random vibration generator according to claim 4 is characterized in that: the center of circle of said air admission hole and venthole is all on the side wall surface of housing middle part sustained height.
6. pneumatic bead random vibration generator according to claim 1; It is characterized in that: said housing upper surface is a removable cover; Have the installation screw on the corresponding position between removable cover and the housing, screw screws in screw removable cover and housing is closely linked together.
7. pneumatic bead random vibration generator according to claim 6, it is characterized in that: said air admission hole is horizontal-extending one admission piece outside housing, and said admission piece and housing are one-body molded.
8. pneumatic bead random vibration generator according to claim 1, it is characterized in that: said housing is an aluminium casing, said collision bead is a polypropylene pellets.
9. pneumatic bead random vibration generator according to claim 1, it is characterized in that: the radius of said housing is 65-80mm, the radius of collision cell is 55-75mm; Housing sidewall thickness is 10-15mm, and the venthole diameter is 2-3.5mm, and the air admission hole diameter is 6-8mm; Housing upper surface thickness is 4-6mm, and housing lower surface thickness is 2.5-3.5mm, and the housing height is 360-400mm; The mouth wall thickness of admission piece is 2.5-3.5mm, and the diameter of said collision bead is 10-19.028mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105273469A CN102074228B (en) | 2010-11-02 | 2010-11-02 | Pneumatic small-ball random vibration generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105273469A CN102074228B (en) | 2010-11-02 | 2010-11-02 | Pneumatic small-ball random vibration generator |
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| Publication Number | Publication Date |
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| CN102074228A CN102074228A (en) | 2011-05-25 |
| CN102074228B true CN102074228B (en) | 2012-06-27 |
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| CN2010105273469A Expired - Fee Related CN102074228B (en) | 2010-11-02 | 2010-11-02 | Pneumatic small-ball random vibration generator |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0220593U (en) * | 1988-07-16 | 1990-02-09 | ||
| CN2700005Y (en) * | 2004-04-28 | 2005-05-18 | 吕国庆 | Pneumatic vibrator |
| CN1881414A (en) * | 2005-06-13 | 2006-12-20 | 乐金电子(天津)电器有限公司 | Voice device for robot dust collector |
| CN101298072B (en) * | 2008-06-10 | 2012-02-01 | 李伟文 | Pneumatic vibrator |
| CN201829183U (en) * | 2010-11-02 | 2011-05-11 | 朱石坚 | Pneumatic globule random vibration generator |
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Granted publication date: 20120627 Termination date: 20131102 |