RU2545408C1 - Vibration isolator of spring type with reinforced base - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: vibration isolator contains base, pole, resilient elements of spring type and support assembly. The base is made as two parallel angle-bars rigidly connected with each other by the thrust plate. On the thrust plate the resilient element of the spring type is secured by means of the cover and two screws. Width if the resilient element of the spring type is below width of the base. The support assembly is made in form of the rod with thread end securing the vibration isolated object. The rod has hemispherical head for contact with the cone surface in the resilient element. To the base using screws the vibration dampening plates is secured, it connects two parallel angle-bars of the base. The vibration dampening plate contains alternating layers, one layer is rigid, and another one is out of the vibration dampening material.

EFFECT: vibration isolation increased efficiency under resonance mode, and in medium and high frequency range.

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Description

The invention relates to mechanical engineering and can be used to protect process equipment from vibration.

It is known the use of spring elastic elements for vibration isolation of technological equipment in the textile industry [1, 2, 3, 4]. Calculations show the high efficiency of these elastic elements in vibration isolation systems, while tests in real factory conditions confirm their effectiveness with high reliability and ease of maintenance.

However, to reduce low-frequency oscillations, a substantial dynamic course of spring elastic elements is required, which is difficult to maintain while maintaining the dimensions of the vibration-isolating systems.

It is known to use spring vibration isolators [5, 6], containing a base, a strut, spring elastic elements and support nodes, at one end of the base a support assembly consisting of upper and lower plates rigidly fastening to each other the spring end is rigidly fixed at the free end which establishes a fixing element with two sheet arched elastic elements, and between the base and the spring an additional elastic element of elastomer is placed.

The disadvantage of this type of vibration isolators is their small overall height, since they belong to the category of supporting vibration isolating systems, where overall dimensions are limited in height, and therefore, their own vibration frequency lies in the mid-frequency range.

Known spring equal-frequency vibration isolators [7, 8], containing a base, stand, spring elastic element and a support node, and the spring elastic element is made of variable section in a plane parallel to the base, and the cross-sectional area increases from the reference node on which the vibration-insulated object is mounted to the rack, in which the other end of the elastic element is rigidly fixed.

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

Known vibration isolator of equal frequency spring type [9], containing elastic elements in the form of flat springs, while one of the ends of the flat springs is fixed between two plates located in the upper part of the vibration isolator, on which a conical helical spring is fixed, and the other ends are connected using an annular bend on flat springs with friction shoes made in the form of U-shaped struts rigidly connected to the base of the shoes.

The disadvantage of this type of vibration isolators is the high cost of the vibration protection system, which is not always justified due to their low reliability.

A spring-type vibration isolator [10] is known, comprising a base, a strut, spring elastic elements and support assemblies, and a rod with a threaded end, on which a strut is fixed that fixes the spring-type elastic element by means of beveled support elements, is rigidly fixed perpendicular to the base. and covers, and the angle of inclination of the supporting elements lies in the range of 10 ... 30 °.

A disadvantage of the known device is the relatively low efficiency at resonance due to the absence of vibration damping.

The closest technical solution to the claimed object is a spring type vibration isolator according to RF patent No. 2279591 [11] (prototype) containing a base, a strut, spring elastic elements and a support unit, the base is made in the form of two parallel corners, rigidly interconnected from the side opposite to the support node, by means of a thrust plate to which the spring-type elastic element is attached by means of a cover and with at least two screws located across the width of the elastic element.

A disadvantage of the known device is the relatively low efficiency at resonance due to the absence of vibration damping, as well as in the medium and high frequency ranges.

The technical result is an increase in the effectiveness of vibration isolation in a resonant mode, and in the medium and high frequency ranges.

This is achieved by the fact that in a spring type vibration absorber with a reinforced base containing a base, a strut, spring elastic elements and a support unit, the base is made in the form of two parallel corners, rigidly interconnected from the side opposite to the support unit, by means of a thrust plate, to which fastens the spring-type elastic element by means of a cover with at least two screws located across the width of the elastic element, wherein the width of the spring-type elastic element is less than the width I, and the support unit is made in the form of a rod with a threaded end, fixing the vibration-insulated object and having a hemispherical head for contact with the conical surface in the elastic element, to the base, by means of screws, a vibration-damping plate is rigidly attached, connecting two parallel corners of the base and consisting of at least two alternating layers: one of which is rigid, and the other is made of vibration damping material.

Figure 1 shows a frontal section of a spring vibration isolator, figure 2 is a top view.

The spring type vibration isolator with a reinforced base comprises a base 1 made in the form of two parallel angles rigidly connected to each other from the side opposite to the support node 9, by means of a thrust plate 4 to which the spring type elastic element 2 is attached by means of a cover 3 with at least at least two screws 5 located across the width of the elastic element 2, while the width of the spring-type elastic element 2 is less than the width of the base 1. The support unit 9 is made in the form of a rod 8 with a threaded end fixing vibration isolation uemy object 6 by means of a nut 7 and having a semispherical head 10 for contact with the conical surface in the elastic member 2.

To the base 1, by means of screws 12, a vibration-damping plate is rigidly attached, connecting two parallel corners of the base and consisting of at least two alternating layers: one of which is rigid, and the other is made of vibration-damping material, for example “agate”, VD-17 mastic, etc.

It is possible to perform vertical plates in two parallel corners of the base 1 with a slope away from the thrust plate 4 to increase the strength and reliability of the vibration isolation system as a whole.

The support node 9 is fixed on the elastic element 2 with the help of a screw 11, screwed into the hemispherical head 10 of the rod 8.

Vibration isolator spring type with a reinforced base works as follows.

During forced vibrations of the vibration-insulated object 6, a dynamic reaction occurs, which is damped by the spring type elastic element 2, which is also a guiding device for vertical movements of the object 6. The horizontal component that occurs when the flat spring is working is compensated in the support unit 9, which provides spatial vibration isolation at high frequencies . The height of the object is adjusted due to the thrust nut 9 and lock nut 7.

The support unit is fixed on the elastic element 2 by means of a screw 11, which is also a restrictive stop at large vibration amplitudes.

The proposed design of a spring-type vibration isolator is effective due to the possibility of damping vibrations in all directions.

Information sources

1. Kochetov O.S., Sazhin B.S. Noise and vibration reduction in production: theory, calculation, technical solutions. - M.: MSTU. A.N. Kosygina, 2001 .-- 319 s: p. 196, fig. 5.64.

2. Kochetov O.S. Textile vibroacoustics. Textbook for universities. - M: MSTU. A.N. Kosygina, “Sovezh Bevo” group, 2003. - 191 p.: P. 60, fig. 3.2.

3. Kochetov OS Method for calculating spring-type vibration isolators for looms // Izv. universities. Technology of the textile industry. - 2002, No. 2. S.103 ... 107.

4. Kochetov O.S. Calculation of the spatial vibration protection system. The journal "Occupational Safety in Industry", No. 8, 2009, pp. 32-37.

5. Kochetov O.S., Kochetova M.O., Khodakova T.D. Vibration isolator spring // Patent for invention No. 2267038. Published on December 27th, 2005. Bulletin of inventions No. 36.

6. Kochetov O.S., Kochetova M.O., Khodakova T.D. Spatial spring vibration isolator // Patent for invention No. 2276295. Published on May 10th, 2006. Bulletin of inventions No. 13.

7. Kochetov O.S., Kochetova M.O., Khodakova T.D. Vibration isolator spring equal-frequency // Patent for invention No. 2267039. Published on December 27th, 2005. Bulletin of inventions No. 36.

8. Kochetov O.S., Kochetova M.O., Khodakova TD, Shesterninov A.V. Spring vibration isolator // Patent for invention No. 2282073. Posted on 08/20/06. Bulletin of inventions No. 23.

9. Kochetov O.S., Kochetova M.O., Khodakova T.D., Shesterninov A.V., Stareev M.E. Vibration isolator of equal frequency spring type // Patent for invention No. 2299370. Published on July 10th, 2006. Bulletin of inventions No. 14.

10. Kochetov O.S., Kochetova M.O., Khodakova T.D. Vibration isolator spring type // Patent for invention No. 2269700. Posted on 02/10/06. Bulletin of inventions No. 4.

11. Kochetov O.S., Kochetova M.O., Khodakova TD, Shesterninov A.V. Vibration isolator spring // Patent for invention No. 2279591. Posted on 05/20/07. Bulletin of inventions No. 19.

Claims (2)

1. Spring vibration isolator with a reinforced base, comprising a base, a strut, spring elastic elements and a support unit, the base is made in the form of two parallel corners, rigidly interconnected from the side opposite to the support unit, by means of a thrust plate to which the elastic element is attached spring type by means of a cover with at least two screws located along the width of the elastic element, while the width of the spring type elastic element is less than the width of the base, and the support unit is made in the form of a rod with a threaded end fixing a vibroisolated object and having a hemispherical head for contact with a conical surface in an elastic element, characterized in that the vibration damping plate is rigidly attached to the base by screws, connecting two parallel corners of the base, and consisting of at least two alternating layers: one of which is rigid, and the other is made of vibration damping material. 2. Spring vibration isolator with a reinforced base according to claim 1, characterized in that the vertical plates in two parallel corners of the base are made with a slope away from the thrust plate to increase the strength and reliability of the vibration isolation system as a whole.

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