Mesh vibration isolator by kochetov

FIELD: machine building.

SUBSTANCE: vibration isolator comprises a base, a resilient mesh element and washers interacting with bushes. The base is made as a plate with mounting holes. The resilient mesh element is fixed by the upper and lower washers. The lower washer is rigidly connected to the base. The upper washer is connected to the central ring embraced by a coaxially set ring rigidly connected to the base. The resilient element including a spring with built-in damper is installed between a packing washer and the base. The spring is a screw cylindrical one and consists of two parts with on-coming ends. The first spring part is fitted with turns of rectangular section with rounded edges and the second part is hollow. The on-coming end of the first part is located in the cavity of the second part. The gaps of segment profile of contacting spring parts are filled by antifriction grease. A sealing gasket is mounted at the end of the second spring part to prevent grease leakage. The first part of the screw spring is embraced by a tube from damping material, for example, polyurethane.

EFFECT: increased efficiency of vibration isolation in resonance mode.

4 cl, 3 dwg

 

The invention relates to mechanical engineering, instrument making and can be used for vibration isolation of equipment, machines, instruments.

It is known the use of mesh elastic elements for vibration isolation of process equipment in the textile industry[1, 2, 3, 4]. Calculations show high efficiency mesh elastic elements in their relatively small dimensions, and tested in real factory conditions confirm their effectiveness with high reliability and ease of maintenance.

Known vibration isolators net pendulum [5, 6], comprising a housing, an elastic element, pendulum suspension, on the basis of two coaxially arranged sleeves, between which is located an elastic mesh element bushing type, wherein the outer bushing height greater than the inner thickness of the pressure washer behind the nut of the pendulum suspension.

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 vibration absorber shyboy net [7], comprising a base, an elastic �the elements, protective sleeve and pressure washer in the hole of the base is placed internal elastic mesh element inner surface is in contact with a restrictive bushing covering the cylindrical surface of the fastening element, and with internal elastic mesh element interact external elastic mesh elements, pressed by the internal element using pressure washers, and the ratio of the outer diameter D of the external elastic mesh element to its inner diameter d is in the optimal interval of values of D/D=3,0 3,6....

The disadvantage of this isolator is its relatively high rigidity that when the spatial loading is the cause of low efficiency.

Known mesh vibration isolators [8, 9, 10], containing respectively three, five, and six installed in parallel mesh elastic element located between the upper cover and the base, each of the elastic elements made in the form installed in parallel spring element connected to the upper and lower washers, and elastic element in the form located coaxially of the sleeve from the volumetric mesh weave, placed inside the spring element between the washers, and fastening the elastic element to the lid and the base is carried out by means �oono spaced screws to the upper and lower pressure washers, and for attaching the base to the platform provided pilot holes, and the cap fixed plastic casing.

A disadvantage of the known vibration isolators is their relatively low ability to damp resonant vibrations.

The closest technical solution to the claimed object is a mesh vibration absorber according to the patent of Russian Federation №2285839 [11] (prototype), comprising a housing, elastic elements, pressure washers, elastic elements are installed in parallel from the spring element connected to the upper and lower washers, and elastic element volumetric mesh weave, placed inside the spring element between the washers and made in the form located coaxially of the sleeve, and the ratio of the outer diameter D of the elastic element mesh height h is in the optimal interval of values of D/h=0,73 1,05....

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

The technical result - improving the efficiency of vibration in the resonant mode.

This is achieved in that in the mesh isolator containing a base, an elastic element mesh and washers that interact with the bushings, the base is made of a plate with fastening about�versiani, mesh elastic element in its lower part rests on the base and fixed bottom washer, rigidly connected with the base and the upper part fixed upper compression washer, rigidly connected to a centrally located ring covered coaxially disposed ring, rigidly connected with the base, and between the compression washer and the base is resilient element comprising a spring with a built-in damper containing a cylindrical helical spring consisting of two parts with counter directional ends, one part of which has coils of rectangular cross section and another portion of the spring is made hollow, with counter directional end of the first part placed in the cavity of the second, the gaps of the segmented profile of the contacting parts of spring is filled with anti-friction lubricant, at the end of the second part of the spring installed sealing gasket to prevent leakage of lubricant, and the first part of the helical springs made from coils of rectangular cross section with rounded edges, covers pipe from a damping material, for example polyurethane.

Fig.1 is a perspective view of the isolator of the mesh of Fig.2 is a front sectional view of Fig.3 - elastic element located between the compression washer and the base.

Vibration absorber mesh comprises a base 1 in in�de plate with the mounting holes 2, mesh elastic element 7, the lower part resting on the base 1 and fixed bottom washer 6, rigidly connected with the base and the upper part fixed upper compression washer 5, is rigidly connected to a centrally located ring 4 covered coaxially disposed ring 3 is rigidly connected with the base 1.

Between the compression washer 5 and the base 1 is located in the elastic element 8, made in the form of a spring with built-in damper, which comprises a cylindrical helical spring consisting of two parts 11 and 12 of counter directional ends 14 and 13 of the respective coils of these springs. For supporting the coils of the spring made of the support ring 9 and 10 for a durable and reliable attachment of the ends of the springs in their work.

The first part of the helical spring 11 is provided with coils of rectangular (or square) cross section with rounded edges, and the second part 12 of the spring is made hollow, for example of circular cross-section, with counter-directional end 14 of the first part of the spring disposed in the cavity directed counter to the second part of the spring with the end 13, while its other end, fixed to the support ring 10, sealed, e.g. by means of a threaded plug (not shown).

In the cavity of the second part 12 of the spring is made of a hollow circular cross-section, formed with four sides, relative to PR�moralnego section of the first part 11 of the spring, the gaps 15 of the segmented profile in cross section perpendicular to the axis of the contacting parts 11 and 12 of the spring.

In order to better adjust the stiffness of the spring (without scratches, Semenov and jamming) the gaps 15 of the segmented profile of the contacting parts 11 and 12 of the spring is filled with anti-friction lubricant, for example a viscous type "grease", with the end 13 of the second part of the spring installed sealing gasket (not shown) to prevent leakage (loss) of grease. This design is a kind of damper "viscous friction" with extended throttle element in the form of gaps 15 of the segmented profile of the contacting parts 11 and 12 of the spring, which in this case will be the analogues of the system, respectively, the "piston-cylinder".

The first part 11 of the helical springs made from coils of rectangular (or square) cross section with rounded edges, covers pipe 16 of the damping material, for example polyurethane, which creates in the system of vibration protection friction, the magnitude of which increases with the approach of the system to a resonant mode that is analogous to the damper "dry friction".

The density of the mesh structure elastic mesh element is in the optimal range of values: 1.2 g/cm3...2.0 g/cm3and the material elastic wire mesh elements - steel EI-70, and its diameter is optimum interval values 0,09 0,15 mm...mm.

The density of the mesh structure of the outer layers of elastic mesh element is 1.5 times the density of the mesh structure of the inner layers of elastic mesh element.

Elastic mesh element 7 can be performed combination of mesh cage filled with elastomer, for example polyurethane.

Vibration absorber net works as follows.

When vibrations vibroisolating object (not shown) located on the top press the washer 5, the elastic mesh element 7 sees both vertical and horizontal loads, thus weakening the dynamic impact on vibrotherapy object, i.e. provides spatial protection and impact protection. The dry friction damper works as follows.

At small amplitudes, when a large attenuation is undesirable, the dissipated energy due to the dry friction between the steel tube and the friction element will be small. At large amplitudes, especially at resonances, the damping increases due to the relative movement of the steel tubes and the friction element. During long-term operation of the spring shock absorber with large amplitudes attenuation increases as the friction element when the surface�tion temperature is expanded in a closed volume is several times greater than steel, thereby increasing the pressure on the walls of steel tubes, resulting in increased dry friction and vibrations quickly cease. Spring is with built-in damper works as follows.

Adjusting the spring rate is accomplished by shortening or lengthening the height of the spring. During rotation of the support rings 9 and 10, the coils of the spring are moved relative to each other in mutually opposite directions relative to the longitudinal axis of the spring, i.e. screwed or vivenciada. In the first case (when tightening) spring stiffness increases, and in the second case (when unscrewing) is reduced, which allows to simplify the adjustment of the spring stiffness.

Thus, the spring thanks to selective properties provides an effective spatial isolation of equipment for all six directions of oscillation (in three axes X. Y, Z and rotary oscillations around these axes) with the damping on the resonance and under different conditions.

Thus, the spring thanks to selective properties provides an effective spatial isolation of equipment for all six directions of oscillation (three-axis Z. Y, Z and rotary oscillations around these axes) with the damping on the resonance, and under different conditions.

Sources of bibliogra�AI, 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. 286, Fig. P. Y. 8 (and).

2. Kochetov O. S. Textile vibroacoustic. Textbook for high schools. Moscow: MGTU im. A. N. Kosygin, group "SOVAG Bevo" 2003. - 191 p.: p. 60, Fig.3.2.

3. Sazhin B. S., Kochetov O. S., Sinev A. V., Khodakov Etc. the PC computational systems vibration isolation equipment installed on a non-rigid Foundation // healthsafety. - 2002, No. 12, pp. 22-28.

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. anti-vibration mesh pendulum // Patent for the invention №2285841. Published 20.10.06. Bulletin of inventions No. 29.

6. Kochetov O. S., M. O. Kochetova, Khodakov T. D., S. S. Kochetov, Kochetov, Sergey Sergeevich. Vibration absorber mesh pendulum // Patent for the invention №2285842. Published 20.10.06. Bulletin of inventions No. 29.

7. Kochetov O. S., M. O. Kochetova, Khodakov Etc., Cesternino A.V., Stareet M. E. vibration absorber shyboy net // Patent for the invention №2288388. Published 27.11.06. Bulletin of inventions No. 33.

8. Kochetov O. S., M. O. Kochetova, Khodakov Etc., Stareet M. E., Lvov, G. V., Lvov N. And., Lvov, Y. G., Kulichenko A. V., Kochetov.With., Kochetov, Sergey Sergeevich. Vibration absorber // Patent for the invention №2285840. Published 20.10.06. Bulletin of inventions No. 29.

9. Kochetov O. S., M. O. Kochetova, Khodakov T. D., S. S. Kochetov, Kochetov, Sergey Sergeevich. Vibration absorber Kochetova // Patent for the invention №2288385. Published 27.11.06. Bulletin of inventions No. 33.

10. Kochetov O. S., M. O. Kochetova, Khodakov T. D., S. S. Kochetov, Kochetov, Sergey Sergeevich. Vibration absorber Kochetova // Patent for the invention №2288386. Published 27.11.06. Bulletin of inventions No. 33.

11. Kochetov O. S., M. O. Kochetova, Khodakov Etc., Stareet M. E., Lvov, G. V., Lvov N. And., Lvov, Y. G., Kulichenko A. V., Kochetov, S. S., Kochetov, Sergey Sergeevich. Vibration absorber spring mesh // Patent for the invention №2285839. Published 20.10.06. Bulletin of inventions No. 29.

1. Vibration absorber mesh containing the base, the elastic element mesh and washer, interacting with bushings, characterized in that the base is made of a plate with the mounting holes, mesh elastic element in its lower part rests on the base and fixed bottom washer, rigidly connected with the base and the upper part fixed upper compression washer, rigidly connected to a centrally located ring covered coaxially disposed ring, rigidly connected with the base, and between the compression washer and the base locatio�false elastic element, contains a spring with a built-in damper containing a cylindrical helical spring consisting of two parts with counter directional ends, one part of which has coils of rectangular cross section and another portion of the spring is made hollow, with counter-directional end of the first part placed in the cavity of the second, the gaps of the segmented profile of the contacting parts of spring is filled with anti-friction lubricant, at the end of the second part of the spring installed sealing gasket to prevent leakage of lubricant, and the first part of the helical springs made from coils of rectangular cross section with rounded edges, covers pipe from a damping material, for example polyurethane.

2. The mesh vibration absorber according to claim 1, characterized in that the density of the mesh structure elastic mesh element is in the optimal range of values: 1.2 g/cm3÷ 2.0 g/cm3and the material elastic wire mesh elements - steel EI-708, and its diameter is optimum interval values 0,09 mm ÷ 0.15 mm.

3. The mesh vibration absorber according to claim 1, characterized in that the density of the mesh structure of the outer layers of elastic mesh element is 1.5 times the density of the mesh structure of the inner layers of elastic mesh element.

4. The mesh vibration absorber according to claim 1, distinguishing�I, that elastic mesh element is combined from mesh cage filled with elastomer, for example polyurethane.



 

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