Spring equifrequent vibration isolator by kochetov

FIELD: machine building.

SUBSTANCE: vibration isolator comprises a base, a supporting platform and a resilient element made as a cylindrical equifrequent spring which is set between them. An object with variable process mass whose vibration shall be isolated is fixed at the supporting plate of the vibration isolator of the upper spring flange. The lower spring flange is fixed at the resilient base. The base is coupled with the lower platform of the vibration isolator by three poles with screws and elastic bushes coaxially set outside the poles. A cylindrical-conical damper made from elastomer is set under the resilient base of the lower spring flange. The damper is mounted on the lower platform of each vibration isolator by its cylindrical part. The conical part of the damper is connected to the resilient base of the spring.

EFFECT: higher vibration isolation efficiency.

2 dwg

 

The invention relates to the field of engineering, namely to equifrequent the vibration isolators are used to a significant reduction arising from the operation of various equipment, mainly with variable mass, the dynamic loads.

Known to use a spring-elastic elements for vibration isolation of process equipment in the textile industry[1, 2, 3, 4]. Calculations show high efficiency spring elastic elements in isolation systems, tested in real factory conditions confirm their effectiveness with high reliability and ease of maintenance.

However, to reduce low-frequency oscillations requires substantial height of the springs.

Known to use spring-type vibration isolators [5, 6] with pendulum suspension, which uses a system of vibration isolation of the suspended type with spring elastic element.

The disadvantage of this type of vibration isolators with pendulum suspension is their large dimension in height as they belong to the category of anti-vibration suspension systems, where the dimensions of the height is not limited, and for support systems of vibration protection requires a relatively small height.

Known spring vibration absorber with dry friction [7], comprising a spring body and a dry friction damper.

p> The disadvantage of this type of vibration isolators is the relatively low reliability in the resonant mode due to the wear of dry friction damper, which somewhat reduces the efficiency of vibration protection.

Known to use spring elements in the vibration isolators [8], comprising a housing, which is made in the form of upper and lower rectangular plates, between which is placed a helical elastic elements of different hardness.

The disadvantage of this type of vibration isolators is the possibility of blocking the helical elastic elements in packages that are some can change their overall stiffness, and hence the efficiency of vibration protection.

Known to use spring elements in vibration dampers [9] with variable damping structure, comprising a housing placed in it a piston rod, and at the end of the rod is fixed vibrotherapy mass held by the springs, and the dry friction damper is made in the form of a friction sleeve with limiting stops on the ends, and the contact force of the friction elements to the hub is via the adjustment screws, which are associated with Executive control motor, and the start signal to the servo motor is supplied from the microprocessor that controls the dry-friction damper according to a given specification, and associated with the acceleration sensor.

Ned�the shortcoming of this type of vibration isolators is the large cost of the system of vibration protection, which is not always justified because of their efficiency of vibration protection.

Known spring vibration absorber with pendulum suspension [10], comprising a cylindrical spiral spring, the lower end of which rests on the upper flange of the casing and cooperating with a reciprocating mechanism.

The disadvantage of this device is the relatively low efficiency at the resonance due to the lack of damping.

The closest technical solution to the claimed object is equifrequent spring vibration absorber for and.with. The USSR №299681 [11] (prototype), containing the base, the support plate located between the elastic element made in the form of a cylindrical spring which has a variable pitch, providing constant natural frequency under all load conditions from the specified range.

The disadvantage of this device is the relatively low efficiency at the resonance due to insufficient damping of oscillations.

The technical result - improving the efficiency of vibration isolation.

This is achieved in that in the spring of equifrequent the mounts for process equipment with variable mass, containing a base, a support platform and located between the elastic element made in the form of a cylindrical equifrequent springs with variable pitch t, ensure the consistency of the natural frequencies of the system under any load P from the specified range: P1≤P≤P2due to its precipitation δ:

δ=δ1(lnPP1+1),

where P1and P2respectively the minimum and maximum load, in which the stored conditions ravnochestnosti; R - load, satisfying the condition P1≤P≤P2;

δ1is a given initial draft spring that meets the minimum load P1and the condition of ravnochestnosti: the constancy of oscillation frequency of vibroisolating the system when the change in mass of the system within specified limits, on the base plate isolator upper flange equifrequent of the spring is fixed vibrotherapy object with variable technological mass and the bottom flange of equifrequent of the spring isolator is fixed on an elastic Foundation, which through at least three racks with screws and coaxially arranged on the outside of the uprights, elastic bushings which are connected to the lower platform isolator and elastic Foundation under bottom flange of equifrequent springs, her asymmetrically placed cylindrical�cal damper, for example, elastomer, mounted with its cylindrical part on the bottom platform of each isolator and the conical part is connected with an elastic Foundation equifrequent spring.

Fig.1 is a perspective view of a spring equifrequent isolator for process equipment with variable mass; Fig.2 - characteristics of equifrequent spring.

Spring equifrequent vibration absorber for process equipment with variable mass (Fig.1) contains equifrequent spring 3. The bottom flange of equifrequent spring 3 spring isolator mounted on elastic Foundation 1, and the upper on the base plate 2, the spring 3 has a variable step t, providing constant natural frequency under all load conditions R from the specified range:

P1≤P≤P2,

where P1and P2respectively the minimum and maximum load, in which the stored conditions ravnochestnosti.

Under the action of load P satisfying the condition P1≤P≤P2it will change its sediment δ (see Fig.2)

δ=δ1(lnPP1+1),

where δ1is a given initial sediment p�dinners meet the minimum load P1. It is in the condition of ravnochestnosti: v=const, i.e. the constancy of oscillation frequency of vibroisolating the system when the change in mass of the system within specified limits.

On the base plate 2 of the upper flange of equifrequent spring isolator 3 by means of a bolt 12 and a nut 10 is fixed vibrotherapy object 11 with technological variable weight (for example, chip removal from the workpiece during the machining, reducing the weight of the beam in the weaving equipment, etc.).

The bottom flange of equifrequent spring isolator 3 is fixed on an elastic Foundation 1, which by means of at least three racks with 6 screws 4 and coaxially arranged on the outside of the uprights elastic sleeve 5, are connected to the lower platform 7 isolator.

Under elastic base 1 bottom flange of equifrequent springs 3, her asymmetrically placed cylinder-conical damper 9, for example of elastomer, is mounted with its cylindrical part on the underside of the platform isolator 7, and the conical portion 8 is connected with an elastic Foundation 1 equifrequent spring 3.

Spring equifrequent vibration absorber operates as follows.

When a dynamic load to the spring 3 is provided equifrequent vibration of the object because the spring has a variable t, providing constant natural frequency under all load conditions R from the specified range:

P1≤P≤P2,

where P1and P2respectively the minimum and maximum load, in which the stored conditions ravnochestnosti.

Under the action of load P satisfying the condition P1≤P≤P2it will change its sediment δ (see Fig.2)

δ=δ1(lnPP1+1),

where δ1is a given initial draft spring that meets the minimum load P1. It is in the condition of ravnochestnosti: the constancy of oscillation frequency of vibroisolating the system when the change in mass of the system within specified limits.

Sources bibliography cited by patent search

1. Kochetov O. S., Sazhin B. S. Reduction of noise and vibration in the production: theory, calculation, technical solutions. Moscow: MGTU im. A. N. Kosygin, 2001. - 319 p.: p. 120, Fig.5.6; p. 287, Fig.P.Y.15.

2. Kochetov O. S. Textile vibroacoustic. Textbook for high schools. Moscow: MGTU im. A. N. Kosygin, group "SOVAG Bevo" 2003. - 191 p.: p. 59, Fig.3.1; p. 61, Fig.3.4 a; Fig.3.5.

3. Kochetov O. S. Isolators type "FAC-1" for looms // Textile� industry 2000, No. 5. S. 19...20.

4. Kochetov O. S. Calculation of spatial systems of vibration protection. The magazine "Safety in industry", No. 8, 2009, pp. 32-37.

5. Kochetov O. S., M. O. Kochetova, Khodakov Etc., Cesternino V. A.-Spring vibration absorber with pendulum suspension // Patent for the invention №2279589. Published 10.07.06. Bulletin of inventions No. 19.

6. Kochetov O. S., M. O. Kochetova, Khodakov Etc., Cesternino V. A. anti-vibration system // Patent for the invention №2279586. Published 10.07.06. Bulletin of inventions No. 19.

7. Kochetov O. S., M. O. Kochetova, Khodakov Etc., Cesternino A.V., Stareet M. E. Spring vibration absorber with dry friction // Patent for the invention №2282075. Published 20.08.06. Bulletin of inventions No. 23.

8. Kochetov O. S., M. O. Kochetova, Khodakov Etc., Cesternino V. A. anti-vibration pad // Patent for the invention №2277650. Published 10.06.06. Bulletin of inventions No. 16.

9. Kochetov O. S., M. O. Kochetova, Cisternino A. V., Zubova I. J. vibration absorber with variable damping structure // Patent for the invention №2303722. Published 27.07.07. Bulletin of inventions No. 21.

10. Kochetov O. S., M. O. Kochetova, Khodakov Etc. with pendulum vibration absorber suspension // Patent for the invention №2269699. Published 10.02.06. Bulletin of inventions No. 4.

11. Josevski I. Y., Kazakov, A. B. Equifrequent vibration absorber // the Copyright certificate of the USSR to invent�their No. 299681, CL F16F 1/06. Published 25.05.1971. Bulletin of inventions No. 12.

Spring equifrequent vibration absorber for process equipment with variable mass, containing a base, a support platform and located between the elastic element made in the form of a cylindrical equifrequent springs with variable pitch t ensure the consistency of the natural frequencies of the system under any load P from the specified range: P1≤P≤P2due to its precipitation δ:
δ=δ1(lnPP1+1)
where P1and P2respectively the minimum and maximum load, in which the stored conditions ravnochestnosti; R - load, satisfying the condition P1≤P≤P2;
δ1is a given initial draft spring that meets the minimum load P1and the condition of ravnochestnosti: the constancy of oscillation frequency of vibroisolating the system when the change in mass of the system within specified limits, characterized in that on the base plate isolator upper flange equifrequent of the spring is fixed vibrotherapy object with variable technological mass and the bottom flange of Ravnica�now one of the spring isolator is fixed on an elastic Foundation, which means at least three racks with screws and coaxially arranged on the outside of the uprights elastic bushings are connected to the lower platform isolator and elastic Foundation under bottom flange of equifrequent springs symmetrically placed her cylindrical damper, for example, of elastomer, mounted with its cylindrical part on the bottom platform of each isolator and the conical part is connected with an elastic Foundation equifrequent spring.



 

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