Curved beam quasi-zero stiffness vibration isolator

Abstract

This invention discloses a quasi-zero stiffness vibration isolator with bending beams, comprising: at least two sets of stacked bending beam assemblies, and bases and upper supports respectively disposed at both ends of the bending beam assemblies. The bases and upper supports are used to constrain the lateral movement of the ends of the bending beam assemblies. Each set of bending beam assemblies includes two symmetrically arranged bending beams, with both ends of the two bending beams connected to the base and upper support respectively. The at least two sets of bending beam assemblies are arranged in an inner-outer stacked manner or in a top-bottom stacked manner. The quasi-zero stiffness vibration isolator with bending beams of this invention is small in size and can provide a large supporting force (i.e., load-bearing capacity) in a confined space. By setting at least two sets of stacked bending beam assemblies, the supporting force can be multiplied, resolving the contradiction between limited installation space and wide-frequency isolation.

Description

Technical Field

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

[0002] Precision measuring instruments are commonly used high-precision, large-size measuring instruments in industrial measurement systems. During actual use, the testing accuracy of precision instruments is affected by many factors, including the external environment, instrument support, and equipment operation, leading to reduced accuracy or test results that fail to meet requirements. Quasi-zero stiffness vibration isolators are a type of nonlinear vibration isolator. Due to their high static and low dynamic stiffness characteristics, they have attracted widespread attention. The high static stiffness of quasi-zero stiffness isolators gives them a large load-bearing capacity, while their low dynamic stiffness provides good vibration isolation for low and ultra-low frequencies. However, existing vibration isolators often cannot resolve the contradiction between limited installation space and wide-frequency isolation requirements to meet the higher precision and dynamic characteristic requirements of optical precision instruments. Summary of the Invention

[0003] The present invention aims to overcome at least one of the defects of the prior art and provide a quasi-zero stiffness vibration isolator for bending beams, which solves the contradiction between the limited installation space and wide frequency range vibration isolation of existing vibration isolators.

[0004] The technical solution adopted in this invention is as follows:

[0005] A quasi-zero stiffness vibration isolator for bending beams includes: at least two sets of superimposed bending beam assemblies, and a base and an upper support respectively disposed at both ends of the bending beam assemblies, wherein the base and the upper support are used to constrain the lateral movement of the ends of the bending beam assemblies; wherein each set of bending beam assemblies includes two symmetrically arranged bending beams, and both ends of the two bending beams are respectively connected to the base and the upper support; the at least two sets of bending beam assemblies are arranged in an inner-outer superposition manner or in a top-bottom superposition manner.

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

[0007] In one embodiment, the curved beam further includes a transitional arc 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 are both rigid structures.

[0009] In one embodiment, the quasi-zero stiffness vibration isolator of the bending beam includes five sets of bending beam components stacked inside and outside, and the spacing between adjacent bending beam components in each set is the same.

[0010] In one embodiment, the base includes a base plate and lower connecting seats symmetrically disposed at both ends of the base plate, the lower connecting seats being connected to the first end 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 being connected to a first end of the curved beam, and the number of steps of the first connecting step matching the number of sets of the curved beam assembly; or, the lower connecting seat includes a first connecting ramp arranged in an inclined manner, the first connecting ramp being connected to a first end of the curved beam.

[0012] In one embodiment, the upper support includes a top plate and two upper connecting seats symmetrically disposed on the top plate. The upper connecting seats are connected to the second end of the curved beam, and the second end of the curved beam is the end opposite to the first end of the curved beam.

[0013] In one embodiment, the upper connecting seat is located on the side of the upper support 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 being connected to the second end of the curved beam, and the number of steps of the second connecting step matching the number of sets of the curved beam assembly; or, the upper connecting seat includes a second connecting ramp arranged in an inclined manner, the second connecting ramp being connected to the second end of the curved beam.

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

[0016] This technical solution utilizes a quasi-zero stiffness bending beam isolator, which is small in size and can provide significant support force (i.e., load-bearing capacity) in confined spaces. By stacking at least two sets of bending beam assemblies, the support force can be multiplied, resolving the contradiction between limited installation space and wide-frequency isolation. Specifically, to ensure the structure always moves along the axial direction and prevent asymmetrical deformation, each set of bending beam assemblies consists of two identical bending beams arranged symmetrically. Each bending beam assembly has a base and an upper support connected to both ends to constrain the lateral movement of the ends of the bending beams, thus forming a basic isolator with quasi-zero stiffness. Furthermore, this technical solution allows for the stacking of two or more sets of bending beam assemblies, either internally or externally, with each set sharing the same base and upper support. This not only minimizes space requirements but also multiplies the support force after stacking the bending beam assemblies. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the quasi-zero stiffness vibration isolator for bending beams according to the present invention. Figure 1 .

[0018] Figure 2 This is a schematic diagram of the quasi-zero stiffness vibration isolator for bending beams according to the present invention. Figure 2 .

[0019] Figure 3 This is a schematic diagram of the structure of the bending beam of the present invention. Figure 1 .

[0020] Figure 4 This is a schematic diagram of the structure of the bending beam of the present invention. Figure 2 .

[0021] Reference numerals: 10, Bending beam assembly; 11, Bending beam; 111, Horizontal beam; 112, Vertical beam; 113, Transition arc beam; 20, Base; 21, Base plate; 22, Lower connecting seat; 30, Upper support seat; 31, Top plate; 32, Upper connecting seat. Detailed Implementation

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

[0023] like Figures 1-2 The bending beam quasi-zero stiffness vibration isolator shown includes: at least two sets of stacked bending beam assemblies 10, and bases 20 and upper supports 30 respectively disposed at both ends of the bending beam assemblies 10. The bases 20 and upper supports 30 are used to constrain the lateral movement of the ends of the bending beam assemblies 10. Each set of bending beam assemblies 10 includes two symmetrically arranged bending beams 11, and both ends of the two bending beams 11 are respectively connected to the bases 20 and upper supports 30. The at least two sets of bending beam assemblies 10 are arranged in an inner-outer stacking manner or in a top-bottom stacking manner.

[0024] The quasi-zero stiffness vibration isolator of the bending beam in this embodiment is small in size and can provide a large supporting force (i.e., load-bearing capacity) in a confined space. By setting at least two sets of bending beam assemblies 10 stacked together, the supporting force can be multiplied, resolving the contradiction between the limited installation space and wide-frequency isolation of the vibration isolator. Specifically, in order to ensure that the structure can always move along the axial direction and prevent asymmetrical deformation, two identical bending beams 11 in each set of bending beam assemblies 10 are arranged symmetrically. Each end of the bending beam assembly 10 is provided with a base 20 and an upper support 30 connected to it to constrain the lateral movement of the ends of each bending beam 11, thereby forming a vibration isolator with quasi-zero stiffness. Furthermore, in this embodiment, two or more sets of bending beam assemblies 10 can be stacked inside and outside or top and bottom. Each set of bending beam assemblies 10 shares the same base 20 and upper support 30, which not only occupies little space but also multiplies the supporting force after stacking the bending beam assemblies 10.

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

[0026] Specifically, the bending beam 11 in this embodiment further includes a transition arc beam 113 that smoothly connects the horizontal beam 111 and the vertical beam 112. The transition arc beam 113 has rounded corners, i.e., it is arc-shaped, so that the right angle at the connection between the horizontal beam 111 and the vertical beam 112 is arc-shaped, thereby adjusting the positive stiffness provided by the vertical beam 112 to match the negative stiffness generated by the horizontal beam 111, thus achieving near-zero stiffness. Therefore, the bending beam 11 in this embodiment is composed of five standard beam segments: one horizontal beam 111, two vertical beams 112, and two transition arc beams 113.

[0027] The bending beam 11 described in this embodiment is an elastic beam, and the base 20 and the upper support 30 are both rigid structures, thereby constraining the lateral movement of the ends of each bending beam 11.

[0028] The quasi-zero stiffness vibration isolator of the bending beam described in this embodiment includes five sets of bending beam assemblies 10 stacked inside and outside, that is, the axes of symmetry of each set of bending beam assemblies 10 coincide. Furthermore, in this embodiment, the inner and outer spacing of each adjacent set of bending beam assemblies 10 is the same to prevent asymmetrical deformation.

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

[0030] The base 20 described in this embodiment includes a base plate 21 and lower connecting seats 22 symmetrically arranged at both ends of the base plate 21. The lower connecting seats 22 are connected to the first end of the curved beam 11, that is, the lower connecting seats 22 are 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 in this embodiment consists of at least two stacked sets, and each bending beam 11 has the same size and structure, the lower connecting seat 22 in this embodiment includes a first connecting step arranged in a stepped manner to facilitate the connection between the lower connecting seat 22 and the bottom ends of different bending beams 11. 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 sets of bending beam assemblies 10. That is, the same set of bending beam assemblies 10 is connected to the same layer of steps on the lower connecting seats 22 located at both ends. Taking five sets of bending beam assemblies 10 in this embodiment as an example, the first connecting step has five steps. Of course, in other embodiments, the base plate 21 itself can also be used as a first-level step for connection. In this case, it can be understood that the bottommost step of the first connecting step is located on the same plane as the base plate 21, still satisfying the requirement that the number of steps of the first connecting step matches the number of sets of bending beam assemblies 10.

[0032] In other embodiments, a ramp can be used instead of a step to facilitate the connection of each set of curved beam assemblies 10. That is, the lower connecting seat 22 can be configured to include a first connecting ramp with a ramp shape, and the first connecting ramp is connected to the first end of the curved beam 11.

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

[0034] In this embodiment, the upper connecting seat 32 is located on the side of the upper support seat 30 facing the base 20, which facilitates the connection of the bending beam 11. At the same time, it makes reasonable use of space, minimizes the size of the bending beam quasi-zero stiffness vibration isolator in this embodiment, and better adapts to narrow spaces.

[0035] Similar to the lower connecting seat 22, the upper connecting seat 32 in this embodiment includes a second connecting step arranged in a stepped manner. The second connecting step is connected to the second end of the curved beam 11, and the number of steps of the second connecting step matches the number of sets of curved beam assemblies 10; that is, the same set of curved beam assemblies 10 is connected to the same layer of steps on the upper connecting seats 32 located at both ends. Taking five sets of curved beam assemblies 10 in this embodiment as an example, the second connecting step has five steps. Of course, the top plate 31 itself can also be used as a first-level step for connection. In this case, it can be understood that the topmost step on the second connecting step is located on the same plane as the top plate 31, still satisfying the requirement that the number of steps of the second connecting step matches the number of sets of curved beam assemblies 10.

[0036] In other embodiments, a ramp can be used instead of a step to facilitate the connection of each set of curved beam assemblies 10. That is, the upper connecting seat 32 includes a second connecting ramp that is set at an angle, and the second connecting ramp is connected to the second end of the curved beam 11.

[0037] The bending beam 11 vibration isolator of this embodiment is not only simple in structure and easy to process, but can also be integrally molded, 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 of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. A quasi-zero stiffness vibration isolator for a bending beam, characterized in that, include: At least two sets of stacked bending beam assemblies, and bases and upper supports respectively located at both ends of the bending beam assemblies, the bases and upper supports constraining the lateral movement of the ends of the bending beam assemblies; wherein each set of bending beam assemblies includes two symmetrically arranged bending beams, the ends of the two bending beams being connected to the base and upper support respectively; the at least two sets of bending beam assemblies are arranged in an inner-outer stacking manner or in a top-bottom stacking manner, the base includes a base plate and lower connecting seats symmetrically located at both ends of the base plate, the lower connecting seats being connected to the first end of the bending beams, the lower connecting seats including a first connecting step arranged in a stepped manner, the first connecting step being connected to the first end of the bending beams, and the number of steps of the first connecting step being the same as that of the bending beam assemblies. The number of sets is matched; each of the curved beams includes a horizontal beam located in the middle, two vertical beams located at both ends of the horizontal beam and perpendicular to the horizontal beam, and the curved beam also includes a transition arc beam that smoothly connects the horizontal beam and the vertical beam; the upper support includes a top plate and two upper connecting seats symmetrically arranged on the top plate, the upper connecting seats are connected to the second end of the curved beam, the second end of the curved beam is the end opposite to the first end of the curved beam; the upper connecting seats are located on the side of the upper support facing the base; the upper connecting seats include a second connecting step arranged in a stepped manner, the second connecting step is connected to the second end of the curved beam, and the number of steps of the second connecting step matches the number of sets of the curved beam assembly.

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

3. The quasi-zero stiffness vibration isolator for bending beams according to claim 1, characterized in that, The quasi-zero stiffness vibration isolator of the bending beam includes five sets of bending beam components stacked inside and outside, and the spacing between adjacent bending beam components in each set is the same.

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