In-plane quasi-zero stiffness vibration isolator in any direction

Abstract

The invention relates to an in-plane quasi-zero stiffness vibration isolator in any direction, and belongs to the field of vibration isolators, the in-plane quasi-zero stiffness vibration isolator comprises a mounting frame, a mounting space is formed on the inner side of the mounting frame, and a vibration isolation mechanism is mounted in the mounting space; the vibration isolation mechanism comprises a supporting seat, a plurality of connecting arms are arranged on the outer side wall of the supporting seat, the connecting arms are located in the same horizontal plane and arranged in the direction away from the supporting seat, the connecting arms are evenly arranged around the supporting seat, and a connecting seat is hinged to the ends, away from the supporting seat, of the connecting arms. The vibration isolation mechanism further comprises a plurality of mounting seats in one-to-one correspondence with the connecting seats, the mounting seats are located on the sides, away from the connecting arms, of the connecting seats, and the mounting seats are hinged to the mounting frame; the connecting base is connected with the mounting base through the quasi-zero-stiffness component, and the quasi-zero-stiffness component is pre-compressed and is in a quasi-zero-stiffness state. According to the vibration isolator, vibration which comes from an object to be subjected to vibration isolation and is in any direction in the horizontal direction can be isolated, and the vibration isolator has good bearing rigidity.

Description

Technical Field

[0001] The invention relates to the field of vibration isolators, and in particular to a quasi-zero stiffness vibration isolator in any direction within a plane. Background Art

[0002] Vibration is an important physical phenomenon with wide application value and important influence in the engineering field. The research and control of vibration plays an extremely important role in improving the performance and life of mechanical equipment and improving the working and living environment of human beings. For example, vibration analysis and testing technology can be used to evaluate the reliability and safety of mechanical equipment and improve its working efficiency and life; noise control technology can be used to reduce noise pollution in industrial production and transportation and improve the living environment. At the same time, vibration also plays an important role in the fields of communication, electronics, medicine, etc.

[0003] The most important way to reduce the transmission of mechanical vibration is vibration isolation. Conventional vibration isolation systems can effectively isolate medium and high frequency vibrations. However, for low frequency vibrations, traditional linear vibration isolation methods need to design the vibration isolation system to be very "soft" in order to obtain excellent low frequency vibration isolation performance. In this way, it cannot guarantee the installation stability of the isolated equipment.

[0004] The quasi-zero stiffness vibration isolation system has the characteristics of high static stiffness and low dynamic stiffness. It can perfectly overcome the inherent contradiction between soft characteristics and installation stability, and is an ideal way to achieve low-frequency vibration isolation. At present, the quasi-zero stiffness vibration isolation system still faces significant limitations: existing research focuses on single-direction (such as vertical) vibration isolation, but the control ability of multi-degree-of-freedom and multi-directional coupled vibration is insufficient. Underwater submersibles and other equipment are subjected to low-frequency (1-20Hz), multi-directional (vertical, lateral, longitudinal and torsion) composite vibration excitation in complex marine environments, and traditional single-direction quasi-zero stiffness systems are difficult to effectively cope with. For example, the interaction between the submersible propeller and the fluid will cause broadband multi-directional vibration, resulting in signal distortion of precision sonar equipment, degradation of optical sensor performance, and even threats to concealment. The existing quasi-zero stiffness mechanism is limited by structural symmetry and insufficient stiffness decoupling design. It is easy to experience stiffness coupling and modal aliasing in multi-directional vibration isolation, and the vibration isolation efficiency is reduced by 30%-50% compared with the single-direction working condition. In this context, the development of multi-degree-of-freedom quasi-zero stiffness systems has become a breakthrough direction. Summary of the invention

[0005] Based on this, it is necessary to provide a quasi-zero stiffness vibration isolator in any direction within a plane, comprising a mounting frame, an installation space being formed on the inner side of the mounting frame, and a vibration isolation mechanism being installed in the installation space; the vibration isolation mechanism comprises a support seat, and a plurality of connecting arms are arranged on the outer side wall of the support seat, the connecting arms are located in the same horizontal plane and are arranged in a direction away from the support seat, and the connecting arms are evenly arranged around the support seat, and one end of the connecting arm away from the support seat is hinged to a connecting seat; the vibration isolation mechanism also comprises a plurality of mounting seats arranged one-to-one corresponding to the connecting seats, the mounting seats are located on the side of the connecting seat away from the connecting arm, and the mounting seats are hinged to the mounting frame; the connecting seat is connected to the mounting seat through a quasi-zero stiffness component, and the quasi-zero stiffness component is pre-compressed and is in a quasi-zero stiffness state.

[0006] Furthermore, the quasi-zero stiffness component is a multi-section beam, which is a vertically arranged plate-like structure of equal thickness, and the cross-section of the multi-section beam in the horizontal direction is bent, and the two ends of the multi-section beam are respectively connected to the connecting seat and the mounting seat.

[0007] Furthermore, the hinge point between the connecting seat and the connecting arm and the hinge point between the mounting seat and the mounting frame are both located on the axis of the connecting arm; the number of multi-section beams in the quasi-zero stiffness component is two, one end of the two multi-section beams is fixedly set on the same first mounting block, and connected to the connecting seat through the first mounting block, the other ends of the two multi-section beams are respectively fixedly connected to the second mounting blocks, and connected to the mounting seat through the first mounting block, and the two multi-section beams are symmetrical about the vertical plane where the axis of the connecting arm is located.

[0008] Furthermore, the connecting arm is arranged on the supporting seat in an adjustable manner along its axial direction.

[0009] Furthermore, the quasi-zero stiffness component is detachably arranged on the mounting seat and the connecting seat.

[0010] Furthermore, the support seat is in a circular ring shape, the connecting arm is arranged along the radial direction of the support seat, and a mounting hole is opened on the support seat corresponding to the connecting arm and passes through it. A threaded connecting rod is formed on one end of the connecting arm facing the support seat, and the threaded connecting rod passes through the mounting hole. Two nuts are also sleeved on the threaded connecting rod, and the two nuts are respectively abutted against the inner and outer sides of the support seat.

[0011] Furthermore, a first mounting portion is formed at one end of the connecting arm away from the support seat, and a first mounting shaft is rotatably provided on the first mounting portion through a bearing structure, the first mounting shaft is vertically arranged, and a first connecting block is provided on the connecting seat corresponding to the first mounting shaft, and the first connecting block is fixedly connected to the first mounting shaft.

[0012] Furthermore, a second mounting portion is provided on the inner wall of the mounting space corresponding to the mounting seat, a second mounting shaft is rotatably provided on the second mounting portion through a bearing structure, the second mounting shaft is vertically arranged, a second connecting block is provided on the mounting seat corresponding to the second mounting shaft, the second connecting block is fixedly arranged on the second mounting shaft; the second mounting shaft and the first mounting shaft are both located on the axis of the connecting arm.

[0013] Furthermore, the number of the connecting arms is even.

[0014] Furthermore, the mounting frame is cylindrical, and the inner wall of the mounting frame is arranged parallel to the outer wall of the support seat, the mounting space is formed between the inner walls of the mounting frame, the mounting seat is hinged to the inner wall of the mounting frame, and a flange is formed at the lower end of the outer wall of the mounting frame.

[0015] The principle and effect of the present invention are further described below in combination with the above technical solutions and the accompanying drawings: In the present invention, the mounting frame is used as the mounting structure of the vibration isolation mechanism, and is used to install the vibration isolation mechanism on the corresponding equipment; the support seat of the vibration isolation mechanism is used to install the object to be isolated, and the object to be isolated can be installed on the support seat by connecting structures such as bolt connection, welding, and clamping. After the object to be isolated is installed on the support seat, it can be supported by the vibration isolation mechanism. At the same time, the vibration isolation mechanism plays a vibration isolation role on the object to be isolated. Specifically, the vibration isolation mechanism is used to carry the object to be isolated in the vertical direction, and plays a vibration isolation role on the object to be isolated in the horizontal direction through the elastic deformation of the quasi-zero stiffness component. Among them, since the vibration isolation mechanism is provided with a quasi-zero stiffness component that is pre-compressed and in a quasi-zero stiffness state between the connecting seat and the mounting seat, the vibration isolation mechanism has a quasi-zero stiffness characteristic, and the initial vibration isolation frequency of the system is in a very low frequency range, which can achieve low-frequency vibration isolation for the object to be isolated.

[0016] At the same time, in the present invention, multiple connecting arms are distributed around the support seat, and when the support seat is displaced in the horizontal direction, the vibration isolation mechanism can maintain the quasi-zero stiffness characteristics of the quasi-zero stiffness component through the follow-up rotation of the connecting seat and the mounting seat. Therefore, multiple connecting arms combined with the corresponding hinged structure and the quasi-zero stiffness component can isolate vibrations from the isolated object in any direction in the horizontal direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the low-frequency vibration isolator in any direction within a plane according to an embodiment of the present invention; Figure 2 for Figure 1 A partial enlarged view of Figure 3It is a schematic diagram of the top view structure of the low-frequency vibration isolator in any direction in a plane according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure in the horizontal direction of the multi-section beam described in an embodiment of the present invention.

[0018] Figure 5 It is a restoring force / stiffness-displacement curve diagram of the multi-segment beam described in an embodiment of the present invention. Reference numerals

[0019] 1-mounting frame, 11-mounting space, 12-flange, 13-second mounting portion, 131-second mounting axis, 21-support seat, 22-connecting arm, 221-threaded connecting rod, 222-nut, 223-first mounting portion, 224-first mounting axis, 23-connecting seat, 24-mounting seat, 25-quasi-zero stiffness member, 251-multi-section beam, 252-first connecting block, 253-second connecting block. DETAILED DESCRIPTION

[0020] In order to facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments: like Figure 1-3 A quasi-zero stiffness vibration isolator in any direction in a plane comprises a mounting frame 1, an mounting space 11 is formed on the inner side of the mounting frame 1, and a vibration isolation mechanism is installed in the mounting space 11; the vibration isolation mechanism comprises a support seat 21, and a plurality of connecting arms 22 are arranged on the outer side wall of the support seat 21, the connecting arms 22 are located in the same horizontal plane and are arranged in a direction away from the support seat 21, and the connecting arms 22 are evenly arranged around the support seat 21, and one end of the connecting arm 22 away from the support seat 21 is hinged to a connecting seat 23; the vibration isolation mechanism also comprises a plurality of mounting seats 24 arranged in a one-to-one correspondence with the connecting seats 23, and the mounting seats 24 are hinged to the mounting frame 1; the connecting seat 23 is connected to the mounting seat 24 through a quasi-zero stiffness member 25, and the quasi-zero stiffness member 25 is pre-compressed and is in a quasi-zero stiffness state.

[0021] In the present invention, the connecting seat 23 is hinged on the connecting arm 22, and can rotate in the horizontal direction relative to the connecting arm 22. The mounting seat 24 is hinged on the mounting frame 1, and can rotate in the horizontal direction relative to the mounting frame 1. Therefore, when the support seat 21 is displaced in the horizontal plane, the vibration isolation mechanism can follow the rotation of the connecting seat 23 and the mounting seat 24, so that the direction of the force applied by the connecting arm 22 to the quasi-zero stiffness component 25 remains unchanged, thereby ensuring that the compression direction of the quasi-zero stiffness component 25 does not change, thereby maintaining the quasi-zero stiffness characteristics of the quasi-zero stiffness component 25.

[0022] In the present invention, the mounting frame 1 is used as the mounting structure of the vibration isolation mechanism, and is used to install the vibration isolation mechanism on the corresponding equipment; the support seat 21 of the vibration isolation mechanism is used to install the object to be isolated, and the object to be isolated can be installed on the support seat 21 through connection structures such as bolt connection, welding, and clamping. After the object to be isolated is installed on the support seat 21, it can be supported by the vibration isolation mechanism. At the same time, the vibration isolation mechanism plays a vibration isolation role on the object to be isolated. Specifically, the vibration isolation mechanism is used to carry the object to be isolated in the vertical direction, and plays a vibration isolation role on the object to be isolated in the horizontal direction through the elastic deformation of the quasi-zero stiffness member 25. Among them, since the vibration isolation mechanism is provided with a quasi-zero stiffness member 25 that is pre-compressed and in a quasi-zero stiffness state between the connecting seat 23 and the mounting seat 24, the vibration isolation mechanism has a quasi-zero stiffness characteristic, and the initial vibration isolation frequency of the system is in a very low frequency range, which can achieve low-frequency vibration isolation for the object to be isolated.

[0023] At the same time, in the present invention, multiple connecting arms 22 are distributed around the support seat 21, and when the support seat 21 is displaced in the horizontal direction, the vibration isolation mechanism can maintain the quasi-zero stiffness characteristics of the quasi-zero stiffness component 25 through the follow-up rotation of the connecting seat 23 and the mounting seat 24. Therefore, multiple connecting arms 22 combined with the corresponding hinge structure and the quasi-zero stiffness component 25 can isolate vibrations from the isolated object in any direction in the horizontal direction.

[0024] In one embodiment, the quasi-zero stiffness component 25 is a multi-section beam 251, which is a vertically arranged plate-like structure of equal thickness, and the cross-section of the multi-section beam 251 in the horizontal direction is bent, and the two ends of the multi-section beam 251 are respectively connected to the connecting seat 23 and the mounting seat 24.

[0025] In this embodiment, the vibration isolation mechanism uses an integrated multi-section beam 251 as a quasi-zero stiffness component 25 (the multi-section beam 251 is pre-compressed to reach a quasi-zero stiffness state). Compared with the quasi-zero stiffness mechanism obtained by connecting positive stiffness elements and negative stiffness elements in parallel, its volume can be made smaller, which can effectively save the installation space 11 of the quasi-zero stiffness mechanism and solve the problem that the traditional combined quasi-zero stiffness vibration isolator occupies too much space. Among them, the multi-section beam can be integrally formed by 3D printing, injection molding and other processes.

[0026] In addition, in this embodiment, the multi-section beam 251 carries the object to be isolated in the vertical direction. In this direction, the multi-section beam 251 with a plate-like structure has a large rigidity. It can be seen that the vibration isolation mechanism of the present invention can provide good low-frequency vibration isolation performance while having a large load-bearing rigidity to ensure the stability of the object to be isolated.

[0027] In this embodiment, the material of the multi-segment beam 251 is polylactic acid, which is made by 3D printing, and its elastic modulus E=3.15GPa, and the allowable stress σ y=49.5MPa; the multi-segment beam 251 is bent into a three-segment structure, and its cross section in the horizontal direction is in the shape of a multi-segment curve, such as Figure 4 As shown, it includes L1 segment, L2 segment and L3 segment connected in sequence, wherein the coordinates of the end point of L1 segment, the intersection point of L1 segment and L2 segment, the intersection point of L2 segment and L3 segment, and the end point of L3 segment in the XY axis coordinate system are respectively: n1 (40mm, 0mm), n2 (36.6mm, 22.0mm), n3 (7.8mm, 23.4mm), n4 (0mm, 32mm), the thickness of the multi-segment beam 251 is h=0.7mm, the height in the vertical direction is w=40mm, and the shapes of L1 segment, L2 segment and L3 segment respectively satisfy the formula: , , .

[0028] The multi-segment beam 251 is compressed along the Y-axis direction of the coordinate system where the multi-segment beam 251 is located, and the static characteristics of the multi-segment beam 251 are measured as follows: Figure 5 As shown, it can be seen that the force-displacement curve of the multi-segment beam 251 of this embodiment in the displacement range [8mm, 18mm] is relatively flat. In this range, the maximum restoring force of the multi-segment beam 251 is 4.38 N, and the minimum restoring force is 3.94 N, and the ratio of the two is 90%. The change amplitude of the restoring force of the multi-segment beam 251 in this range is very small, and constant force output is approximately achieved. In this displacement range, the stiffness value of the multi-segment beam 251 is within a very small range. When the displacement compression is 8 mm, the maximum stiffness is only 0.144 N / mm. Therefore, this range can be set as the quasi-zero range of the multi-segment beam 251, and the multi-segment beam 251 has a quasi-zero stiffness characteristic in this displacement range.

[0029] It can be seen that in this embodiment, the multi-section beam 251 installed in the vibration isolator can be compressed to the displacement range [8mm, 18mm] along the Y-axis direction of the coordinate system where the multi-section beam 251 is located, so that it can be in a quasi-zero stiffness state. Accordingly, when the multi-section beam 251 is installed on the vibration isolator, it needs to be compressed along the Y-axis direction of the coordinate system where it is located.

[0030] In one embodiment, the hinge point between the connecting seat 23 and the connecting arm 22 and the hinge point between the mounting seat 24 and the mounting frame 1 are both located on the axis of the connecting arm 22; the number of the multi-section beams 251 in the quasi-zero stiffness member 25 is two, one end of the two multi-section beams 251 is fixedly set on the same first mounting block, and connected to the connecting seat 23 through the first mounting block, the other ends of the two multi-section beams 251 are respectively fixedly connected to the second mounting block, and connected to the mounting seat 24 through the first mounting block, and the two multi-section beams 251 are symmetrical about the vertical plane where the axis of the connecting arm 22 is located.

[0031] In this embodiment, the quasi-zero stiffness member 25 located between the connecting seat 23 and the mounting seat 24 is composed of two multi-section beams 251, and the two multi-section beams 251 are symmetrical about the vertical plane where the axis of the connecting arm 22 is located. In this way, the structural uniformity of the vibration isolator can be effectively improved, and thus its bearing capacity and structural stability can be effectively improved.

[0032] At the same time, in this embodiment, the two multi-section beams 251 installed in the vibration isolator are compressed in the horizontal direction of their symmetry plane. Therefore, the Y-axis of the coordinate system where the two multi-section beams 251 are located needs to coincide with the symmetry axis plane of the two multi-section beams 251, so that the direction of displacement of the multi-section beam 251 installed in the vibration isolator is the Y-axis direction of its coordinate system, so as to maintain the quasi-zero stiffness characteristics of the multi-section beam 251.

[0033] In one embodiment, the connecting arm 22 is disposed on the supporting seat 21 in an adjustable manner along its axial direction.

[0034] In this embodiment, the position of the connecting arm 22 can be adjusted along its axial direction. Therefore, during the installation of the vibration isolator, the compression amount of the quasi-zero stiffness component 25 can be adjusted by adjusting the position of the connecting arm 22, so that the quasi-zero stiffness component 25 can easily reach a quasi-zero stiffness state.

[0035] In one embodiment, the quasi-zero stiffness component 25 is detachably disposed on the mounting seat 24 and the connecting seat 23 .

[0036] In this embodiment, the quasi-zero stiffness component 25 is detachably arranged on the mounting seat 24 and the connecting seat 23. Therefore, according to different use requirements of the vibration isolator, different specifications of the quasi-zero stiffness component 25 can be replaced accordingly, so that the vibration isolator can have a wider range of uses. After replacing the quasi-zero stiffness component 25 of different specifications, the compression amount of the quasi-zero stiffness component 25 can be adjusted by adjusting the position of the connecting arm 22 to ensure that the installed quasi-zero stiffness component 25 can be in a quasi-zero stiffness state.

[0037] In this embodiment, the quasi-zero stiffness member 25 can be detachably arranged on the mounting seat 24 and the connecting seat 23 through a threaded connection structure, a plug-in structure, etc. For example, mounting grooves for the first connecting block 252 and the second connecting block 253 to be embedded can be respectively provided on the connecting seat 23 and the mounting seat 24, and the detachable connection structure between the first connecting block 252 and the second connecting block 253 and the mounting grooves can realize the detachable connection between the quasi-zero stiffness member 25 and the connecting seat 23 and the mounting seat 24.

[0038] In one embodiment, the support seat 21 is in a circular ring shape, and the connecting arm 22 is arranged along the radial direction of the support seat 21. A mounting hole is opened on the support seat 21 corresponding to the connecting arm 22 and passes through it. A threaded connecting rod 221 is formed at one end of the connecting arm 22 facing the support seat 21, and the threaded connecting rod 221 passes through the mounting hole. Two nuts 222 are also sleeved on the threaded connecting rod 221, and the two nuts 222 are respectively abutted against the inner and outer sides of the support seat 21.

[0039] In this embodiment, the connecting arm 22 is fixedly connected to the support seat 21 by tightening the two nuts 222 thereon against the inner and outer sides of the support seat 21. At the same time, by adjusting the relative positions of the threaded connecting rod 221 and the two nuts 222, the position of the connecting arm 22 relative to the support seat 21 can be adjusted, thereby realizing the position adjustment of the connecting arm 22 in its length direction.

[0040] In one embodiment, a first mounting portion 223 is formed at one end of the connecting arm 22 away from the support seat 21, and a first mounting shaft 224 is rotatably provided on the first mounting portion 223 through a bearing structure, and the first mounting shaft 224 is vertically arranged, and a first connecting block 252 is provided on the connecting seat 23 corresponding to the first mounting shaft 224, and the first connecting block 252 is fixedly connected to the first mounting shaft 224.

[0041] In this embodiment, the first connecting block 252 of the connecting seat 23 is hinged to the first mounting portion 223 of the connecting arm 22 through the first mounting shaft 224, and the connecting seat 23 can rotate freely around the axis of the first mounting shaft 224, that is, it can rotate freely in a horizontal plane relative to the connecting arm 22.

[0042] In one embodiment, a second mounting portion 13 is provided on the inner wall of the mounting space 11 corresponding to the mounting seat 24, a second mounting shaft 131 is rotatably provided on the second mounting portion 13 through a bearing structure, the second mounting shaft 131 is vertically arranged, a second connecting block 253 is provided on the mounting seat 24 corresponding to the second mounting shaft 131, the second connecting block 253 is fixedly arranged on the second mounting shaft 131; the second mounting shaft 131 and the first mounting shaft 224 are both located on the axis of the connecting arm 22.

[0043] In this embodiment, the second connecting block 253 of the mounting seat 24 is hinged to the second mounting portion 13 on the inner wall of the mounting space 11 through the second mounting shaft 131, and the mounting seat 24 can rotate freely around the axis of the second mounting shaft 131, that is, it can rotate freely in a horizontal plane relative to the mounting space 11.

[0044] In one embodiment, the number of the connecting arms 22 is even.

[0045] In this embodiment, the number of connecting arms 22 is even, and they are evenly arranged along the radial direction of the support seat 21 and around the support seat 21. Therefore, the support arms are located in groups of two on the same straight line, which can make the structure of the vibration isolator evenly arranged and effectively improve the bearing capacity and vibration isolation effect of the vibration isolator.

[0046] In one embodiment, the mounting frame 1 is cylindrical, and the inner wall of the mounting frame 1 is arranged parallel to the outer wall of the support seat 21, the mounting space 11 is formed between the inner walls of the mounting frame 1, the mounting seat 24 is hinged to the inner wall of the mounting frame 1, and a flange 12 is formed at the lower end of the outer wall of the mounting frame 1.

[0047] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A quasi-zero stiffness vibration isolator in any direction in a plane, characterized in that: It includes a mounting frame, an installation space is formed on the inner side of the mounting frame, and a vibration isolation mechanism is installed in the installation space; the vibration isolation mechanism includes a support seat, and a plurality of connecting arms are arranged on the outer side wall of the support seat, the connecting arms are located in the same horizontal plane and are arranged in a direction away from the support seat, and the connecting arms are evenly arranged around the support seat, and one end of the connecting arm away from the support seat is hinged to the connecting seat; the vibration isolation mechanism also includes a plurality of mounting seats arranged in a one-to-one correspondence with the connecting seats, the mounting seats are located on the side of the connecting seat away from the connecting arm, and the mounting seats are hinged to the mounting frame; the connecting seat is connected to the mounting seat through a quasi-zero stiffness component, and the quasi-zero stiffness component is pre-compressed and is in a quasi-zero stiffness state.

2. The quasi-zero stiffness vibration isolator in any direction in a plane according to claim 1, characterized in that: The quasi-zero stiffness component is a multi-section beam, which is a vertically arranged plate-like structure with equal thickness, and the cross-section of the multi-section beam in the horizontal direction is bent, and the two ends of the multi-section beam are respectively connected to the connecting seat and the mounting seat.

3. The quasi-zero stiffness vibration isolator in any direction in a plane according to claim 2, characterized in that: The hinge point between the connecting seat and the connecting arm and the hinge point between the mounting seat and the mounting frame are both located on the axis of the connecting arm; the number of multi-section beams in the quasi-zero stiffness component is two, one end of the two multi-section beams is fixedly set on the same first mounting block and connected to the connecting seat through the first mounting block, the other ends of the two multi-section beams are respectively fixedly connected to the second mounting blocks, and connected to the mounting seat through the first mounting block, and the two multi-section beams are symmetrical about the vertical plane where the axis of the connecting arm is located.

4. A quasi-zero stiffness vibration isolator in any direction in a plane according to any one of claims 1 to 3, characterized in that: The connecting arm is arranged on the supporting seat in an adjustable manner along the axial direction thereof.

5. The quasi-zero stiffness vibration isolator in any direction in a plane according to claim 4, characterized in that: The quasi-zero stiffness component is detachably arranged on the mounting seat and the connecting seat.

6. The quasi-zero stiffness vibration isolator in any direction in a plane according to claim 4, characterized in that: The support seat is in the shape of a circular ring, and the connecting arm is arranged along the radial direction of the support seat. A mounting hole is provided on the support seat corresponding to the connecting arm and passes through it. A threaded connecting rod is formed on one end of the connecting arm facing the support seat, and the threaded connecting rod passes through the mounting hole. Two nuts are also sleeved on the threaded connecting rod, and the two nuts are respectively abutted against the inner and outer sides of the support seat.

7. The quasi-zero stiffness vibration isolator in any direction in a plane according to claim 6, characterized in that: A first mounting portion is formed at one end of the connecting arm away from the support seat, and a first mounting shaft is rotatably provided on the first mounting portion through a bearing structure, and the first mounting shaft is vertically arranged. A first connecting block is provided on the connecting seat corresponding to the first mounting shaft, and the first connecting block is fixedly connected to the first mounting shaft.

8. The quasi-zero stiffness vibration isolator in any direction in a plane according to claim 7, characterized in that: A second mounting portion is provided on the inner wall of the mounting space corresponding to the mounting seat, a second mounting shaft is rotatably provided on the second mounting portion through a bearing structure, the second mounting shaft is vertically provided, a second connecting block is provided on the mounting seat corresponding to the second mounting shaft, the second connecting block is fixedly provided on the second mounting shaft; the second mounting shaft and the first mounting shaft are both located on the axis of the connecting arm.

9. The quasi-zero stiffness vibration isolator in any direction in a plane according to claim 8, characterized in that: The number of the connecting arms is even.

10. The quasi-zero stiffness vibration isolator in any direction in a plane according to claim 9, characterized in that: The mounting frame is cylindrical, and the inner wall of the mounting frame is arranged parallel to the outer wall of the support seat, the mounting space is formed between the inner walls of the mounting frame, the mounting seat is hinged to the inner wall of the mounting frame, and a flange is formed at the lower end of the outer wall of the mounting frame.

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