Bent beam quasi-zero stiffness vibration isolator

Abstract

The invention discloses a bending beam quasi-zero stiffness vibration isolator which comprises at least two sets of bending beam assemblies arranged in a stacked mode, a base and an upper supporting seat, the base and the upper supporting seat are arranged at the two ends of the bending beam assemblies respectively, and the base and the upper supporting seat are used for restraining transverse movement of the tail ends of the bending beam assemblies. Wherein each bent beam assembly comprises two bent beams which are symmetrically arranged, and the two ends of the two bent beams are connected with the base and the upper supporting seat correspondingly; and the at least two groups of bent beam components are arranged in an inner and outer overlapping manner or an up and down overlapping manner. The bending beam quasi-zero stiffness vibration isolator is small in size, large supporting force, namely bearing capacity, can be provided in a narrow space, the supporting force can be multiplied by arranging and stacking at least two sets of bending beam assemblies, and the contradiction between narrow installation space of the vibration isolator and wide-frequency-domain vibration isolation is solved.

Description

Technical Field

[0001] The invention relates to the field of vibration isolators, and more specifically to a bending beam quasi-zero stiffness vibration isolator. Background Art

[0002] Precision measuring instruments are a commonly used high-precision, large-size measuring instrument in industrial measurement systems. During actual use, the test accuracy of precision instruments will be affected by many factors such as the external environment, instrument brackets, and equipment operation, which will reduce the accuracy or the test results will not meet the requirements. Quasi-zero stiffness isolators are a type of nonlinear vibration isolators. They have received widespread attention due to their high static and low dynamic stiffness characteristics. The high static stiffness of quasi-zero stiffness isolators gives them a large load-bearing capacity, while their low dynamic stiffness characteristics give them a good vibration isolation effect for low and ultra-low frequencies. However, in order to meet the higher accuracy and dynamic characteristics requirements of optical precision instruments, existing vibration isolators often cannot resolve the contradiction between their narrow installation space and wide-band vibration isolation. Summary of the invention

[0003] The present invention aims to overcome at least one defect of the above-mentioned prior art and provide a bending beam quasi-zero stiffness vibration isolator for resolving the contradiction between the existing vibration isolators being unable to resolve the narrow installation space and wide frequency domain vibration isolation.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A bending beam quasi-zero stiffness vibration isolator comprises: at least two groups of bending beam assemblies arranged in a stacked manner, and a base and an upper support seat respectively arranged at both ends of the bending beam assemblies, wherein the base and the upper support seat are used to restrict the lateral movement of the ends of the bending beam assemblies; wherein each group of the bending beam assemblies comprises two symmetrically arranged bending beams, and both ends of the two bending beams are respectively connected to the base and the upper support seat; and at least two groups of the bending beam assemblies are arranged in an inside-outside stacking manner or in an up-and-down stacking manner.

[0006] In one embodiment, each of the curved beams includes a horizontal beam located in the middle, and two vertical beams located at both ends of the horizontal beam and arranged perpendicular to the horizontal beam.

[0007] In one of the embodiments, the curved beam further includes a transitional camber beam that smoothly connects the horizontal beam and the vertical beam.

[0008] In one embodiment, the bending beam is an elastic beam; and / or the base and the upper support seat are both rigid structures.

[0009] In one embodiment, the bending beam quasi-zero stiffness vibration isolator includes five groups of bending beam components stacked inside and outside, and the inner and outer spacing distances of each group of adjacent bending beam components are the same.

[0010] In one of the embodiments, the base includes a bottom plate and lower connecting seats symmetrically arranged at two ends of the bottom plate, and the lower connecting seats are connected to the first end portion of the curved beam.

[0011] In one embodiment, the lower connecting seat includes a first connecting step arranged in a stepped manner, the first connecting step is connected to the first end portion of the bending beam, and the number of steps of the first connecting step matches the number of groups of the bending beam assembly; or, the lower connecting seat includes a first connecting inclined surface arranged in an inclined surface, the first connecting inclined surface is connected to the first end portion of the bending beam.

[0012] In one embodiment, the upper support seat includes a top plate and two upper connecting seats symmetrically arranged on the top plate, and the upper connecting seat is connected to the second end portion of the bending beam, and the second end portion of the bending beam is an end opposite to the first end portion of the bending beam.

[0013] In one embodiment, the upper connecting seat is arranged on a side of the upper supporting seat facing the base.

[0014] In one embodiment, the upper connecting seat includes a second connecting step arranged in a stepped manner, the second connecting step is connected to the second end portion of the bending beam, and the number of steps of the second connecting step matches the number of groups of the bending beam assembly; or, the upper connecting seat includes a second connecting inclined surface arranged in an inclined surface, the second connecting inclined surface is connected to the second end portion of the bending beam.

[0015] Compared with the prior art, the beneficial effects of the present invention include at least:

[0016] The bending beam quasi-zero stiffness isolator of the present technical solution is small in size and can provide a large supporting force, i.e., a bearing capacity, in a small space. By arranging at least two groups of bending beam assemblies to be superimposed, the supporting force can be multiplied, thereby resolving the contradiction between the narrow installation space of the isolator and the wide-band vibration isolation. Specifically, in order to ensure that the structure can always move along the axial direction and prevent asymmetric deformation, the two identical bending beams in each group of bending beam assemblies of the present technical solution are arranged symmetrically, and bases and upper support seats connected thereto are provided at both ends of the bending beam assemblies to constrain the lateral movement of the ends of each bending beam, thereby forming a basic vibration isolator with quasi-zero stiffness. Moreover, in the present technical solution, two or more groups of bending beam assemblies can be arranged to be superimposed inside and outside or up and down, and each group of bending beam assemblies shares the same base and upper support seat, which not only occupies a small space, but also increases the supporting force exponentially after the bending beam assemblies are superimposed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure of the bending beam quasi-zero stiffness vibration isolator of the present invention is shown in FIG. Figure 1 .

[0018] Figure 2 The structure of the bending beam quasi-zero stiffness vibration isolator of the present invention is shown in FIG. Figure 2 .

[0019] Figure 3 The structure of the bending beam of the present invention is schematically shown in FIG. Figure 1 .

[0020] Figure 4 The structure of the bending beam of the present invention is schematically shown in FIG. Figure 2 .

[0021] Figure numerals: 10, bending beam assembly; 11, bending beam; 111, horizontal beam; 112, vertical beam; 113, transition arc beam; 20, base; 21, bottom plate; 22, lower connecting seat; 30, upper supporting seat; 31, top plate; 32, upper connecting seat. DETAILED DESCRIPTION

[0022] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0023] like Figure 1-Figure 2 A bending beam quasi-zero stiffness isolator shown includes: at least two groups of stacked bending beam assemblies 10, and a base 20 and an upper support seat 30 respectively arranged at both ends of the bending beam assemblies 10, the base 20 and the upper support seat 30 are used to constrain the lateral movement of the ends of the bending beam assemblies 10; wherein each group of the bending beam assemblies 10 includes two symmetrically arranged bending beams 11, and the two ends of the two bending beams 11 are respectively connected to the base 20 and the upper support seat 30; at least two groups of bending beam assemblies 10 are arranged in an inside-outside stacking manner or in an up-and-down stacking manner.

[0024] The bending beam quasi-zero stiffness isolator of this embodiment is small in size and can provide a large supporting force, i.e., a bearing capacity, in a small space. By arranging at least two groups of bending beam assemblies 10 to be superimposed, the supporting force can be multiplied, thereby resolving the contradiction between the narrow installation space of the isolator and the wide-band vibration isolation. Specifically, in order to ensure that the structure can always move along the axial direction and prevent asymmetric deformation, the two identical bending beams 11 in each group of bending beam assemblies 10 are arranged symmetrically in this embodiment, and a base 20 and an upper support seat 30 connected thereto are provided at both ends of the bending beam assembly 10 to constrain the lateral movement of the ends of each bending beam 11, thereby forming a vibration isolator with quasi-zero stiffness. Moreover, in this embodiment, two or more groups of bending beam assemblies 10 can be arranged to be superimposed inside and outside or up and down, and each group of bending beam assemblies 10 shares the same base 20 and upper support seat 30, which not only occupies a small space, but also increases the supporting force exponentially after the bending beam assemblies 10 are superimposed.

[0025] like Figure 3-Figure 4 As shown, in this embodiment, the structure of each bending beam 11 is the same, and the bending beam 11 includes a horizontal beam 111 located in the middle, and two vertical beams 112 located at both ends of the horizontal beam 111 and arranged perpendicularly to the horizontal beam 111. The horizontal beam 111 serves as an elastic beam providing negative stiffness, and the two vertical beams 112 are respectively located at the upper and lower sides of both ends of the horizontal beam 111 and connected to the horizontal beam 111 at 90 degrees, and the vertical beam 112 serves as a beam providing positive stiffness, so that the vibration isolator has quasi-zero stiffness.

[0026] Specifically, the bending beam 11 of this embodiment further includes a transition radian beam 113 that smoothly connects the horizontal beam 111 and the vertical beam 112. The transition radian beam 113 is rounded and chamfered, that is, it is arranged in an arc shape, so that the right angle where the horizontal beam 111 and the vertical beam 112 are connected is curved, so as to adjust the positive stiffness provided by the vertical beam 112 to match the negative stiffness generated by the horizontal beam 111, so as to have quasi-zero stiffness. Therefore, the bending beam 11 of this embodiment is composed of five sections of standard beams, that is, one section of horizontal beam 111, two sections of vertical beams 112 and two sections of transition radian beams 113.

[0027] In this embodiment, the bending beam 11 is an elastic beam, and the base 20 and the upper support seat 30 are both rigid structures, so as to constrain the lateral movement of the end of each bending beam 11.

[0028] The bending beam quasi-zero stiffness vibration isolator described in this embodiment includes five groups of bending beam components 10 stacked inside and outside, that is, the symmetry axes of each group of bending beam components 10 coincide. In addition, the inner and outer spacing distances of each group of adjacent bending beam components 10 are the same in this embodiment to prevent asymmetric deformation.

[0029] In other embodiments, the number of groups of the bending beam assembly 10 can be increased or decreased according to actual conditions. For example, in other embodiments, it can be set to two groups, three groups, four groups or six groups.

[0030] The base 20 of this embodiment includes a bottom plate 21 and lower connecting seats 22 symmetrically arranged at both ends of the bottom plate 21, and the lower connecting seats 22 are connected to the first end of the curved beam 11, that is, the lower connecting seat 22 is connected to the bottom end of the curved beam 11. The symmetrically arranged lower connecting seats 22 enable the symmetrically arranged curved beam 11 to be better connected to the base 20.

[0031] Since the bending beam assembly 10 of this embodiment is at least two groups of superposition, and the size structure of each bending beam 11 is the same, in order to facilitate the connection between the lower connecting seat 22 and the bottom ends of different bending beams 11, the lower connecting seat 22 of this embodiment includes a first connecting step arranged in a ladder shape, the first connecting step is connected to the first end of the bending beam 11, and the number of steps of the first connecting step matches the number of groups of the bending beam assembly 10, that is, the same group of bending beam assemblies 10 are respectively connected to the same layer of steps on the lower connecting seat 22 located at both ends. Taking the five groups of bending beam assemblies 10 in this embodiment as an example, the first connecting step is provided with five steps. Of course, in other embodiments, the bottom plate 21 itself can also be used as a first step for connection. At this time, it can be understood that the bottommost step on the first connecting step is located in the same plane as the bottom plate 21, and the number of steps of the first connecting step still matches the number of groups of the bending beam assembly 10.

[0032] In other embodiments, a sloped surface may be used instead of a step to facilitate the connection of each group of bending beam assemblies 10, that is, the lower connecting seat 22 may be configured to include a first connecting sloped surface arranged in an inclined surface, and the first connecting slope is connected to the first end portion of the bending beam 11.

[0033] The upper support seat 30 of this embodiment includes a top plate 31 and two upper connecting seats 32 symmetrically arranged on the top plate 31, and the upper connecting seats 32 are connected to the second end of the bending beam 11. The second end of the bending beam 11 is an end opposite to the first end of the bending beam 11, that is, the upper connecting seat 32 is connected to the top of the bending beam 11. Through the symmetrically arranged lower connecting seats 22, the symmetrically arranged bending beam 11 can be better connected to the upper support seat 30.

[0034] The upper connecting seat 32 of this embodiment is arranged on the side of the upper supporting seat 30 facing the base 20, so as to facilitate the connection of the bending beam 11 and make rational use of the space, minimize the space size of the bending beam quasi-zero stiffness isolator of this embodiment, and better adapt to the narrow space.

[0035] Similar to the lower connecting seat 22, the upper connecting seat 32 described in this embodiment includes a second connecting step arranged in a stepped manner, the second connecting step is connected to the second end portion of the bending beam 11, and the number of steps of the second connecting step matches the number of groups of the bending beam assembly 10; that is, the same group of bending beam assemblies 10 are respectively connected to the same layer of steps on the upper connecting seat 32 located at both ends. Taking the five groups of bending beam assemblies 10 in this embodiment as an example, the second connecting step is provided with five steps. Of course, the top plate 31 itself can also be used as a first-level step for connection. At this time, it can be understood that the topmost step on the second connecting step is located in the same plane as the top plate 31, and the number of steps of the second connecting step still matches the number of groups of the bending beam assembly 10.

[0036] In other embodiments, a sloped surface may be used instead of a step to facilitate the connection of each group of bending beam assemblies 10 , that is, the upper connecting seat 32 includes a second connecting sloped surface arranged in an inclined surface, and the second connecting slope is connected to the second end portion of the bending beam 11 .

[0037] The bending beam 11 vibration isolator of this embodiment is not only simple in structure and easy to process, but also can be integrally formed, thereby reducing assembly errors and further ensuring the vibration isolation effect.

[0038] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A bending beam quasi-zero stiffness vibration isolator, characterized in that: include: At least two groups of superimposed bending beam assemblies, and a base and an upper support seat respectively arranged at both ends of the bending beam assemblies, the base and the upper support seat are used to restrict the lateral movement of the end of the bending beam assembly; wherein each group of the bending beam assemblies includes two symmetrically arranged bending beams, and the two ends of the two bending beams are respectively connected to the base and the upper support seat; at least two groups of bending beam assemblies are arranged in an inside-outside superimposed manner or in an up-and-down superimposed manner.

2. The bending beam quasi-zero stiffness vibration isolator according to claim 1, characterized in that: Each of the curved beams includes a horizontal beam located in the middle, and two vertical beams located at both ends of the horizontal beam and arranged perpendicularly to the horizontal beam.

3. The bending beam quasi-zero stiffness vibration isolator according to claim 2, characterized in that: The curved beam further includes a transition camber beam smoothly connecting the horizontal beam and the vertical beam.

4. The bending beam quasi-zero stiffness vibration isolator according to claim 1, characterized in that: The bending beam is an elastic beam; and / or the base and the upper support seat are both rigid structures.

5. The bending beam quasi-zero stiffness vibration isolator according to claim 1, characterized in that: The bending beam quasi-zero stiffness vibration isolator comprises five groups of bending beam components which are stacked inside and outside, and the inside and outside spacing distances of each group of adjacent bending beam components are the same.

6. The bending beam quasi-zero stiffness vibration isolator according to any one of claims 1 to 5, characterized in that: The base comprises a bottom plate and lower connecting seats symmetrically arranged at two ends of the bottom plate, and the lower connecting seats are connected to the first end portion of the curved beam.

7. The bending beam quasi-zero stiffness vibration isolator according to claim 6, characterized in that: The lower connecting seat includes a first connecting step arranged in a stepped manner, the first connecting step is connected to the first end portion of the bending beam, and the number of steps of the first connecting step matches the number of groups of the bending beam assembly; or, the lower connecting seat includes a first connecting inclined surface arranged in an inclined surface, the first connecting inclined surface is connected to the first end portion of the bending beam.

8. The bending beam quasi-zero stiffness isolator according to any one of claims 1 to 5, characterized in that: The upper support seat includes a top plate and two upper connecting seats symmetrically arranged on the top plate, and the upper connecting seat is connected to the second end portion of the bending beam, and the second end portion of the bending beam is an end opposite to the first end portion of the bending beam.

9. The bending beam quasi-zero stiffness vibration isolator according to claim 8, characterized in that: The upper connecting seat is arranged on a side of the upper supporting seat facing the base.

10. The bending beam quasi-zero stiffness vibration isolator according to claim 8, characterized in that: The upper connecting seat includes a second connecting step arranged in a stepped manner, the second connecting step is connected to the second end portion of the bending beam, and the number of steps of the second connecting step matches the number of groups of the bending beam assembly; or, the upper connecting seat includes a second connecting inclined surface arranged in an inclined surface, the second connecting inclined surface is connected to the second end portion of the bending beam.

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