Spring by kochetov

FIELD: machine building.

SUBSTANCE: spring comprises a casing made from a spiral hollow resilient steel tube. An additional resilient steel tube is installed inside the casing coaxially with a gap. A friction element is placed in the gap between the tubes and is made from polyethylene having higher thermal expansion coefficient as compared to steel. The surfaces of the casing and the additional resilient steel tube touch the surfaces of the friction elements. A screw solid resilient pin is set coaxially to the casing. The Friction elements are tubular, in the form of granulated fill from polyethylene with vibration damping material granules included.

EFFECT: increased efficiency of vibration isolation in a resonance mode.

2 cl, 1 dwg

 

The invention relates to mechanical engineering and can be used for vibration isolation of process equipment, including looms.

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, the body is made in the form of a hollow vertical posts, interacting with the T-shaped platform, elastic products�Noah with a dry friction damper, made in the form of a sleeve whose inner surface through a spring-loaded friction elements interacts with the outer surface of the rack, and on its outer surface is mounted a spring resting on the base of the rack, and between the interacting surfaces of the sleeve and the rack placed restrictive buffer element.

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 so that they form a closed loop around the perimeter of the bottom plate, and a helical elastic elements made in the form of a package consisting of cylindrical helical springs of different stiffness and height.

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 with a storage�tion therein of the 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 in a predetermined characteristic and is associated with a sensor of acceleration.

The disadvantage 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.

The closest technical solution to the claimed object is a spring vibration absorber with pendular suspension on the patent of Russian Federation №2269699 [10] (prototype), containing a cylindrical spiral spring, the lower end of which rests on the upper flange of the casing and cooperating with a reciprocating mechanism, which is made in the form of a threaded rod with nuts on the ends and bearing washers resting on the rubber elastic elements performing the function of the elastic hinge, the upper rubber elastic element is located between the upper flange of the spring and the support washer and the lower between the support washer and a plate on which is mounted VI�rotorwave equipment.

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

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

This is achieved in that in the spring, comprising a housing made of screw, hollow and elastic steel tube, inside of which is coaxially and symmetrically installed with a gap, at least one additional elastic steel tube, and in the gaps between the tubes is, at least one friction element, for example made of polyethylene having a high coefficient of thermal expansion compared to steel, thus the surface of the body and an additional elastic steel tube in contact with the surfaces of the friction elements, and their axis coincides with the axis of the turns of the shell, and the Central, coaxially and symmetrically to the housing is a screw of elastic rod, is made solid, while the friction elements are made tubular, for example of polyethylene.

The drawing shows a diagram of the spring, frontal section.

Spring for spring-type vibration isolators comprises a housing 1 made of screw, hollow and elastic steel tube, inside of which is coaxially and symmetrically installed with a gap, at least one to�additional elastic steel tube 3, and in the gaps between the tubes is at least one frictional element 2, for example made of polyethylene having a high coefficient of thermal expansion compared to steel. In this case the surface of the housing 1, an additional elastic steel tube 3 in contact with the surfaces of the friction elements 2 and 4, and their axis coincides with the axis of the turns of the case. Centrally, coaxially and symmetrically with the housing 1 there is a screw of elastic rod 5, which may be formed as the enclosure, and additional elastic hollow steel tube, as shown in the drawing, or solid (not shown). The friction elements 2 and 4 may be made tubular, as shown in the drawing, to have either a continuous structure, for example of polyethylene, as element 4, or combined, as the element 2, for example made of polyethylene, interspersed with granules from vibrationfree material. It is possible that when the friction element is in the form of granular backfill from vibrationfree material (not shown). Possible that the screw of elastic rod 5 is formed as a helical spring with a pitch of less than 5-10% of the step helix of the housing 1, to create the interference fit, providing the functionality of the friction elements 2 and 4.

Spring for spring-type vibration isolators slave�melts 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 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.

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.

Sources bibliography

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, the group "the Owl� 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 // Textiles - 2000, No. 5.With.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. B�letang inventions No. 4.

1. Spring, comprising a housing made of a hollow screw and elastic steel tube, inside of which is coaxially and symmetrically installed with a gap, at least one additional elastic steel tube, and in the gaps between the tubes is, at least one friction element, for example made of polyethylene having a high coefficient of thermal expansion compared to steel, thus the surface of the body and an additional elastic steel tube in contact with the surfaces of the friction elements, and their axes coincide with the axis of the coils of the shell, and a Central coaxially and symmetrically to the housing is a screw of elastic rod, whether solid, and the friction elements are made tubular, for example of polyethylene, wherein the friction element is in the form of granular backfill from vibrationfree material, characterized in that the friction element is combined, for example of polyethylene, interspersed with granules from vibrationfree material.

2. The spring according to claim 1, characterized in that the screw of elastic rod made in the form of helical springs with a step of less than 5÷10% helixe corps, to create the interference fit, providing the functionality of the friction elements.



 

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