CN103397666A - Rubber support for vibration isolation or vibration reduction - Google Patents

Abstract

The invention discloses a rubber support for shock isolation or vibration reduction, which comprises rubber plate layers and steel plate layers which are stacked sequentially from bottom to top, and the rubber support formed by the overlapping of rubber plate layers and steel plate layers The cross-sectional area first decreases linearly and then increases linearly from bottom to top, and the top area of the rubber support is equal to the bottom area. By improving the structure of the longitudinal section, the invention solves the problems of excessive tensile stress, easy instability and rapid drop of vertical stiffness of the existing rubber bearing under the condition of horizontal deformation.

Description

A rubber bearing for shock isolation or vibration reduction

technical field

The invention relates to a rubber bearing, in particular to a rubber bearing used for shock isolation or vibration reduction.

Background technique

As shown in Fig. 1, at present, the shape of the longitudinal section of the rubber bearing, no matter whether its cross section is circular or rectangular, is rectangular. In the process of large horizontal deformation, especially after the horizontal deformation is greater than 200%, this kind of rectangular cross-section rubber bearing will cause problems such as excessive tensile stress, easy instability, and rapid decrease in vertical stiffness. Therefore, from the perspective of bearing structure, it is necessary to consider the optimization of the shape of the bearing, especially the shape of the longitudinal section, so that the rubber bearing of the same material can make full use of the material properties and have better stability and mechanical performance.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a rubber bearing for shock isolation or vibration reduction, which solves the problem of tensile stress of the rubber bearing in the case of horizontal deformation of the existing rubber bearing. Too large, easy to lose stability and vertical stiffness drop too fast.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A rubber bearing for shock isolation or vibration reduction, including rubber plate layers and steel plate layers stacked sequentially from bottom to top, the cross-sectional area of the rubber bearing formed by the rubber plate layers and steel plate layers is staggered from From bottom to top, it first decreases linearly and then increases linearly, and the top area of the rubber bearing is equal to the bottom area.

The top edge and the bottom edge of the longitudinal section are parallel to each other; the median line of the top edge of the longitudinal section coincides with the median line of the bottom edge; the two sides of the longitudinal section are symmetrical along the median line Curve or broken line; the upper and lower figures of the longitudinal section are isosceles trapezoids symmetrical to each other along the boundary line at the half-height of the support.

The cross-section of the rubber bearing is circular, and the cross-section of the rubber bearing is circular to facilitate manufacture.

Beneficial effects of the present invention: 1. Under the same volume, the rubber bearing of the present invention can produce greater horizontal deformation; first, because the limit horizontal displacement of the rubber bearing is proportional to the effective bearing area, the Increase, the effective bearing area of the rubber bearing of the present invention is larger than the rubber bearing of the rectangular vertical section, so the limit horizontal displacement of the rubber bearing of the present invention is greater than that of the rubber bearing of the rectangular vertical section under the same lift; secondly , because the rubber bearing of the present invention increases the area of the upper and lower sections where the maximum stress occurs, and reduces the maximum tensile stress of the bearing, so when the same tensile stress is generated, the horizontal shear deformation of the rubber bearing of the present invention Larger, so the ultimate horizontal displacement of the rubber bearing of the present invention is greater than the rubber bearing of the rectangular vertical section under the same lift;

2. The stress of the rubber bearing of the present invention is lower and the safety is higher; it can be seen from the knowledge of material mechanics that the most intuitive way to reduce the stress of a circular section is to increase the diameter of the section, because the rubber bearing of the present invention increases the resulting The area of the upper and lower sections of the tensile stress makes the maximum stress on the edge of the rubber bearing of the present invention less than that of the rubber bearing with the rectangular section of the same volume;

3. During the horizontal displacement process, the rubber bearing of the present invention has greater vertical stiffness and higher safety; the vertical stiffness is proportional to the effective bearing area, and the initial effective bearing area of the rubber bearing of the invention Although it is smaller than the rectangular vertical section rubber bearing of the same volume, with the increase of the horizontal displacement, the effective bearing area of the rubber bearing of the present invention is larger than the rectangular vertical section rubber bearing of the same volume, so the rubber bearing of the present invention The vertical rigidity of the support is greater and the safety is higher;

4. The stability of the rubber bearing of the present invention is higher; known from material mechanics, the buckling stress of the compression bar is directly proportional to the effective pressure-bearing area of the compression bar, and with the increase of the horizontal displacement, the rubber of the present invention The effective bearing area of the bearing is larger than that of the rubber bearing with a rectangular vertical section, and in the process of horizontal displacement, the decrease of the horizontal stiffness of the rubber bearing of the present invention is smaller than that of the rubber bearing with a rectangular vertical section, so now The rubber bearing with rectangular vertical section will enter into the buckling state earlier than the rubber bearing of the present invention, so the stability of the rubber bearing of the present invention is higher;

5. The vertical stiffness of the rubber bearing of the present invention drops even smaller when the horizontal deformation is large; due to the characteristics of the shape of the longitudinal section, when the bearing deforms in the horizontal direction, the overlapping area of the upper and lower end surfaces basically remains the same at the initial stage. After reaching a certain deformation, the area of the overlapping area begins to decrease. Compared with ordinary bearings, the area of overlapping areas decreases significantly, and the resulting vertical stiffness decreases at a slower rate than ordinary bearings.

Description of drawings

Fig. 1 is a longitudinal section of a rubber bearing in the prior art.

Fig. 2 is a longitudinal section of the best solution of the present invention.

Fig. 3 is a comparison diagram of the effective pressure-bearing area of the bearing of the present invention and that of a common bearing when it deforms horizontally.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 2: a rubber bearing for shock isolation or vibration reduction, including rubber plate layers 1 and steel plate layers 2 that are stacked sequentially from bottom to top, that is to say, the rubber bearing includes multiple rubber layers 1 And multiple steel plate layers 2, you can first set a rubber layer 1, then connect a steel plate layer 2 above the rubber layer 1, then connect the second rubber layer 1 above the steel plate layer 2, and then connect the second rubber layer 1 above the second rubber layer 1 The second steel plate layer 2 is connected to alternately arrange the rubber layer 1 and multiple steel plate layers 2 , and the bottom end of the same rubber support can also be the steel plate layer 2 . The cross-sectional area of the rubber bearing formed by the staggered superimposition of the rubber plate layer 1 and the steel plate layer 2 decreases linearly from bottom to top and then increases linearly, the top area of the rubber bearing is equal to the bottom area, and the The top edge and the bottom edge of the longitudinal section of the rubber bearing are parallel to each other, the median line of the top edge of the longitudinal section coincides with the median line of the bottom edge, and the two sides of the longitudinal section are symmetrical along the median line The upper and lower figures of the longitudinal section are isosceles trapezoids symmetrical to each other along the boundary line at the half-height of the support.

The cross-section of the rubber bearing is circular, and the cross-section of the rubber bearing is circular to facilitate manufacture.

Since the cross-sectional area of the structural rubber support gradually decreases from bottom to top, it can solve the problems of excessive tensile stress and easy instability in the case of horizontal deformation. The following is further demonstrated by the experimental data.

The experimental objects are the existing rectangular cross-section rubber bearings introduced in the background technology and the rubber bearings with the same isosceles trapezoidal upper and lower superimposed cross-sections. The specifications of the rectangular section rubber bearing are: diameter 400mm, height 120mm. The specifications of the rubber bearing of the optimal solution of the present invention are: upper diameter 430mm, middle layer diameter 380mm, bottom edge diameter 430mm, height 120mm.

The stress analysis and comparison of the two test objects were carried out by the finite element software ABAQUS. In the software simulation analysis, a vertical stress of 10MPa perpendicular to the surface of the support and acting on the center of the support is applied to the two types of supports respectively, and the rubber layer is made to have a level of 300% of the total thickness during the constant vertical stress. out of shape.

According to the software simulation results, it can be analyzed that the maximum stress of the rubber bearing occurs at the top of the horizontal deformation direction side and the opposite bottom. When the horizontal displacement is 228mm (approximately 200% of the rubber thickness), the tensile stress of the rectangular section rubber bearing reaches 2.69MPa, while the tensile stress of the rubber bearing of the present invention is 1.94MPa, which is 28% lower than that of the same period last year. The smaller the maximum stress value of the rubber bearing, the more favorable the stability of the rubber bearing.

The cross-section and longitudinal section of the rubber bearing of the present invention can be in various shapes, as long as the cross-sectional area decreases linearly from bottom to top and then increases linearly and the top area of the rubber bearing is equal to the bottom area. Fig. 3 is a comparison diagram of the effective pressure-bearing area of the bearing of the present invention and the ordinary bearing when it deforms horizontally. Although the initial effective pressure-bearing area of the rubber bearing of the present invention is smaller than that of the rubber bearing with a rectangular vertical section of the same volume, it increases with the horizontal deformation. With the increase of displacement, the effective bearing area of the rubber bearing of the present invention is larger than that of the rectangular vertical section rubber bearing of the same volume.

When used, rubber bearings are usually placed between the foundation and the superstructure. The rubber bearing can be placed according to the actual situation.

The rubber bearing of the present invention improves the stress performance of the rubber bearing and improves the deformation capacity and stability of the rubber bearing by changing the shape of the longitudinal section of the rubber bearing.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (6)

1. A rubber bearing for shock isolation or vibration reduction, which is characterized in that: it includes rubber plate layers and steel plate layers that are stacked sequentially from bottom to top, and the rubber plate layers and steel plate layers are stacked alternately. The cross-sectional area of the support first decreases linearly and then increases linearly from bottom to top, and the top area of the rubber support is equal to the bottom area. 2. A rubber bearing for shock isolation or vibration reduction according to claim 1, characterized in that: the top edge and the bottom edge of the longitudinal section are parallel to each other. 3. A rubber bearing for shock isolation or vibration reduction according to claim 2, characterized in that: the middle line of the top edge of the longitudinal section coincides with the middle line of the bottom edge. 4. A rubber bearing for shock isolation or vibration reduction according to claim 3, characterized in that: the two sides of the longitudinal section are symmetrical curves or broken lines along the median line. 5. A rubber bearing for shock isolation or vibration reduction according to claim 4, characterized in that: the upper and lower figures of the longitudinal section are isosceles trapezoids symmetrical to each other along the boundary line at the half-height of the bearing . 6. A rubber bearing for shock isolation or vibration reduction according to claim 5, characterized in that: the cross section of the rubber bearing is circular.

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