RU2567101C1 - Vibration isolator - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to machine building. The vibration isolator contains spring material strip. The roll of initial shape is obtained by deformation of the strip to cylindrical shape. The roll of final shape is obtained with its ends laid with overlapping up to 3/4 of the length of initial roll circle and heat treatment up to necessary strength.

EFFECT: improvement of vibration isolating properties is achieved.

1 dwg

Description

The invention relates to the radio industry for use as vibration isolators of blocks of electronic equipment, as well as printed circuit boards, with a floor-mounted version of the installation in the block body.

Known vibration mount, which can be used as a vibration isolator in the vibration protection system of engineering objects from the effects of vibration and shock loads [1].

The vibration mount contains flat elastic elements installed in the form of cross arches. The elastic element is made in the form of a curved carrier plate, to which compensating curved plates are pivotally attached to the center. The reactive forces from the compensating plates are directed towards each other. The opposite ends of the plates of the vibration mount are fixed in the stops, which are regulated by a movable sleeve with a self-locking threaded part. This makes it possible to adjust the rigidity of the vibration mounts. The complexity of the design, as well as manual adjustment of stiffness before operation are the main disadvantages.

The closest technical solution adopted for the prototype is a commercially available vibration isolator of the petal type [2], designed for vibration isolation of equipment in a group installation along the edges of a vibration-insulated object (IN). Petal springs made of steel tape are installed in the gap between the sides of the casing and the housing. Vibration damping is carried out due to dry friction of the spring petals on gaskets pressed from kapron powder. A significant disadvantage of the prototype is the relatively low efficiency of its anti-vibration properties, which is a consequence of fixed stiffness and limited damping when exposed to external vibration loads.

The technical problem to be solved, presented in the application, is to increase the vibration-isolating properties of the vibration isolator. In the proposed solution, the stiffness and damping parameters of the vibration isolator are variable values that vary depending on the dynamic load in the entire frequency range of the external disturbance, which is what the goal is achieved.

The specified technical result is achieved by the fact that in the known solution containing a strip of spring material, a scroll is additionally formed from the strip by deforming it to a cylindrical shape, forming a scroll, the ends of which are overlapped to ¾ the circumference of the scroll and subjected to heat treatment to the necessary rigidity .

The drawing shows the design of the vibration isolator. It is made of a strip of spring material (steel, bronze, composite, etc.), and then subjected to heat treatment to achieve the necessary rigidity.

When developing a vibration isolator for practical use in a specific vibration protection system of an object, the workpiece parameters are calculated by a formula that relates the physicomechanical properties of the material, geometry and effective load [3]:

where: P is the effective load in H;

E is the modulus of elasticity of the spring material, N / m ² ;

J is the moment of inertia of the cross section of the strip of the workpiece, m ⁴ .

For a rectangular section:

where: B is the width of the strip in m;

H is the strip thickness in m;

Δ is the maximum shift of the ends of the strip scroll vibration isolator during operation, m;

R is the initial radius of the cylinder, taking into account the overlapping ends of the strip of the workpiece with approach, m

The proposed technical solution is simple, easy to manufacture and operate, has been tested experimentally with a positive result.

Vibration Isolator Operation

Under the influence of a dynamic vibrational load on the VO, the geometry of the vibration isolator changes in the radial and tangential directions. There is a further, from the initial state, twisting of a strip of spring material into a scroll. Moreover, depending on the magnitude of the load, its elastic-damping properties smoothly change. With an increase in the amplitude of VO vibrations in the region of resonant frequencies, the twist angle of the vibration isolator increases, which causes an increase in its rigidity due to a decrease in the radius and thickening of the cylinder wall. At the same time, the scattering of vibrational energy increases due to an increase in the area of frictional contact. A smooth change in the stiffness of the vibration isolator, in general, changes the picture of the amplitude-frequency characteristics of the vibration-insulated object. The amplitude of the resonant peak decreases significantly, i.e., the amplitude-frequency characteristic is smoothed.

The durability and reliability of the proposed design of the vibration isolator is not worse than that of a leaf spring.

Information sources

1. RF patent for the invention No. 2426920, IPC F16F 1/18, 2011

2. Karpushin VB Vibration and shock in radio equipment. M .: "Soviet Radio", 1971, 343 p.

3. Ponomarev S. D., Biderman V. L., Likharev K. K., Makushin V. M., Malinin N. N., Feodosiev V. I. Strength calculations in mechanical engineering. T. 1. M.: Mashgiz, 1956, 884 p.

Claims (1)

A vibration isolator containing a strip of spring material, characterized in that the initial scroll is obtained by deformation of the strip to a cylindrical shape, the final shape scroll is obtained from the initial scroll with its ends overlapping each other to 3/4 of the circumference of the initial scroll and heat treated to stiffness.

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