In-plane arbitrary direction quasi-zero stiffness vibration isolator

Abstract

The application relates to an in-plane arbitrary direction quasi-zero stiffness vibration isolator, belonging to the field of vibration isolators, which comprises 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 comprises a support base, a plurality of connecting arms are arranged on the outer side wall of the support base, the connecting arms are located in the same horizontal plane and are arranged in the direction away from the support base, the connecting arms are uniformly arranged around the support base, and a connecting base is hinged to the end of the connecting arm away from the support base; the vibration isolation mechanism further comprises a plurality of mounting bases which are one-to-one correspondingly arranged with the connecting bases, the mounting bases are located on the side, away from the connecting arms, of the connecting bases, and the mounting bases are hinged to the mounting frame; the connecting base is connected with the mounting base through a quasi-zero stiffness component, and the quasi-zero stiffness component is pre-compressed and in a quasi-zero stiffness state. The application can isolate the vibration in any direction in the horizontal direction from the isolated object, and has good bearing stiffness.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vibration isolators, in particular to an in-plane arbitrary direction quasi-zero stiffness vibration isolator. BACKGROUND

[0002] Vibration is an important physical phenomenon with wide application value and important influence in engineering field. The research and control of vibration play 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 communication, electronics, medicine and other fields.

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

[0004] Quasi-zero stiffness vibration isolation system has the characteristics of high static stiffness and low dynamic stiffness, and can perfectly overcome the inherent contradiction between softness and installation stability, which is an ideal way to realize low frequency vibration isolation. The current quasi-zero stiffness vibration isolation system still faces significant limitations: existing researches focus on single direction (such as vertical) vibration isolation, and the control ability of multi-degree-of-freedom and multi-direction coupled vibration is insufficient. Underwater submersible equipment and other equipment are subjected to low frequency (1-20Hz) and multi-direction (vertical, horizontal, longitudinal and torsional) composite vibration excitation in complex marine environment. Traditional single direction quasi-zero stiffness system is difficult to effectively cope with. For example, the interaction between the propeller of the submersible and the fluid will cause wideband multi-directional vibration, leading to signal distortion of precision sonar equipment, performance degradation of optical sensors, and even threatening the concealment. The existing quasi-zero stiffness mechanism is limited by structural symmetry, insufficient stiffness decoupling design, and other problems, and when multi-directional vibration isolation is performed, stiffness coupling and modal aliasing phenomena are easy to occur, and the vibration isolation efficiency is reduced by 30%-50% compared with single direction working condition. Under this background, the development of multi-degree-of-freedom quasi-zero stiffness system has become a breakthrough direction. SUMMARY

[0005] Based on this, it is necessary to provide an in-plane arbitrary direction quasi-zero stiffness vibration isolator, comprising a mounting frame, the inner side of the mounting frame is formed with a mounting space, and a vibration isolation mechanism is installed in the mounting space; the vibration isolation mechanism comprises a support seat, 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 away from the support seat, and the connecting arms are uniformly arranged around the support seat, and one end of the connecting arm away from the support seat is hinged with a connecting seat; the vibration isolation mechanism further comprises a plurality of mounting seats corresponding to the connecting seat, the mounting seat is located on the side of the connecting seat away from the connecting arm, and the mounting seat is hinged to the mounting frame; the connecting seat is connected with the mounting seat through a quasi-zero stiffness member, and the quasi-zero stiffness member is pre-compressed and in a quasi-zero stiffness state.

[0006] Further, the quasi-zero stiffness member is a multi-section beam, the multi-section beam is a plate-shaped structure arranged vertically and with equal thickness, and the cross section of the multi-section beam in the horizontal direction is in a bent shape, and the two ends of the multi-section beam are connected with the connecting seat and the mounting seat respectively.

[0007] Further, the hinge points of the connecting seat and the connecting arm and the hinge points of the mounting seat and the mounting frame are located on the axis of the connecting arm; the number of multi-section beams in the quasi-zero stiffness member is two, one end of the two multi-section beams is fixedly arranged on the same first mounting block and connected with the connecting seat through the first mounting block, the other end of the two multi-section beams is fixedly connected with a second mounting block respectively and connected with the mounting seat through the first mounting block, and the two multi-section beams are symmetrical about the vertical plane in which the axis of the connecting arm is located.

[0008] Further, the connecting arm is adjustably arranged on the support seat along the axial direction thereof.

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

[0010] Further, the support seat is in a circular ring shape, the connecting arm is arranged along the radial direction of the support seat, the support seat is provided with a mounting hole penetrating therethrough corresponding to the connecting arm, one end of the connecting arm facing the support seat is formed into a threaded connecting rod, the threaded connecting rod penetrates through the mounting hole, and two nuts are further sleeved on the threaded connecting rod, and the two nuts abut against the inner and outer sides of the support seat respectively.

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

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

[0013] Further, the number of the connecting arms is double.

[0014] Further, the mounting frame is in a cylindrical shape, the inner side wall of the mounting frame is arranged in parallel with the outer side wall of the support seat, the mounting space is formed between the inner side walls of the mounting frame, the mounting seat is hingedly arranged on the inner side wall of the mounting frame, and a flange is formed on the lower end of the outer side wall of the mounting frame.

[0015] The principle and effects of the present application will be further described below in combination with the above technical solutions and the accompanying drawings:

[0016] In the present application, the mounting frame is used as a mounting structure of a vibration isolation mechanism and is used for mounting the vibration isolation mechanism on a corresponding device; the support seat of the vibration isolation mechanism is used for mounting a vibration-isolated object, and the vibration-isolated object can be mounted on the support seat through a bolt connection, welding, clamping or other connecting structures; after the vibration-isolated object is mounted on the support seat, the vibration-isolated object can be supported by the vibration isolation mechanism, and at the same time, the vibration isolation mechanism plays a role in isolating the vibration of the vibration-isolated object; specifically, the vibration isolation mechanism is used for bearing the vibration-isolated object in the vertical direction and plays a role in isolating the vibration of the vibration-isolated object in the horizontal direction through the elastic deformation of the quasi-zero stiffness member. Since the vibration isolation mechanism is provided with the quasi-zero stiffness member which is pre-compressed and in a quasi-zero stiffness state between the connecting seat and the mounting seat, the vibration isolation mechanism has the quasi-zero stiffness characteristic, the initial isolation frequency of the system is in a very low frequency range, and low-frequency vibration isolation of the vibration-isolated object can be achieved.

[0017] Meanwhile, in the present application, a plurality of connecting arms are distributed around the support seat, and when the vibration isolation mechanism appears displacement in the horizontal direction of the support seat, the quasi-zero stiffness characteristic of the quasi-zero stiffness member can be maintained through the following rotation of the connecting seat and the mounting seat, therefore, the plurality of connecting arms in combination with the corresponding hinged structure and the quasi-zero stiffness member can isolate the vibration in any direction in the horizontal direction from the vibration-isolated object. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic diagram of an in-plane arbitrary direction low-frequency vibration isolator according to an embodiment of the present application;

[0019] Figure 2 FIG. 2 is a partial enlarged view of FIG. 1; Figure 1 ​

[0020] Figure 3 The top view structural schematic diagram of the in-plane arbitrary direction low-frequency vibration isolator according to the embodiment of the present application is shown in the figure.

[0021] Figure 4 The horizontal direction cross-sectional structural schematic diagram of the multi-segment beam according to the embodiment of the present application is shown in the figure.

[0022] Figure 5 The restoring force / stiffness-displacement curve diagram of the multi-segment beam according to the embodiment of the present application is shown in the figure.

[0023] Reference signs

[0024] 1 - mounting frame, 11 - mounting space, 12 - flange, 13 - second mounting part, 131 - second mounting shaft, 21 - support seat, 22 - connecting arm, 221 - threaded connecting rod, 222 - nut, 223 - first mounting part, 224 - first mounting shaft, 23 - connecting seat, 24 - mounting seat, 25 - quasi-zero stiffness component, 251 - multi-segment beam, 252 - first connecting block, 253 - second connecting block. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of those skilled in the art, the present application will be further described in detail below in combination with the drawings and embodiments:

[0026] As Figures 1-3 An in-plane arbitrary direction quasi-zero stiffness vibration isolator, comprising a mounting frame 1, an inner side of the mounting frame 1 is formed with a mounting space 11, and a vibration isolation mechanism is mounted in the mounting space 11; the vibration isolation mechanism comprises a support seat 21, 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 uniformly arranged around the support seat 21, and a connecting seat 23 is hinged to one end of the connecting arm 22 away from the support seat 21; the vibration isolation mechanism further comprises a plurality of mounting seats 24 corresponding to the connecting seats 23 one by one, and the mounting seats 24 are hinged to the mounting frame 1; the connecting seat 23 is connected with the mounting seat 24 through a quasi-zero stiffness component 25, and the quasi-zero stiffness component 25 is pre-compressed and in a quasi-zero stiffness state.

[0027] In the present application, the connecting seat 23 is hinged on the connecting arm 22 and can rotate in the horizontal direction relative to the connecting arm 22, and the mounting seat 24 is hinged on the mounting rack 1 and can rotate in the horizontal direction relative to the mounting rack 1. Therefore, when the support seat 21 moves in the horizontal plane, the vibration isolation mechanism can keep the direction of the force applied by the connecting arm 22 on the quasi-zero stiffness component 25 unchanged through the following rotation of the connecting seat 23 and the mounting seat 24, so as to ensure that the compressed direction of the quasi-zero stiffness component 25 does not change, and the quasi-zero stiffness characteristic of the quasi-zero stiffness component 25 is maintained.

[0028] In the present application, the mounting rack 1 is used as a mounting structure of the vibration isolation mechanism for mounting the vibration isolation mechanism on the corresponding device; the support seat 21 of the vibration isolation mechanism is used for mounting the isolated object, and the isolated object can be mounted on the support seat 21 through bolt connection, welding, clamping or other connection structures. After the isolated object is mounted on the support seat 21, it can be supported by the vibration isolation mechanism, and at the same time, the vibration isolation mechanism plays a role in isolating the vibration of the isolated object. Specifically, the vibration isolation mechanism is used to bear the isolated object in the vertical direction and plays a role in isolating the vibration of the isolated object in the horizontal direction through the elastic deformation of the quasi-zero stiffness component 25. Since the vibration isolation mechanism is provided with the quasi-zero stiffness component 25 which 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 the quasi-zero stiffness characteristic, and the initial isolation frequency of the system is in a very low frequency range, so that low-frequency vibration isolation of the isolated object can be achieved.

[0029] Meanwhile, in the present application, a plurality of connecting arms 22 are distributed around the support seat 21, and the vibration isolation mechanism can keep the quasi-zero stiffness characteristic of the quasi-zero stiffness component 25 through the following rotation of the connecting seat 23 and the mounting seat 24 when the support seat 21 moves in the horizontal direction. Therefore, the plurality of connecting arms 22 in combination with the corresponding hinged structures and quasi-zero stiffness components 25 can isolate the vibration in any direction in the horizontal direction from the isolated object.

[0030] In one embodiment, the quasi-zero stiffness component 25 is a multi-segment beam 251, which is a vertically arranged and equal-thickness plate-shaped structure, and the cross section of the multi-segment beam 251 in the horizontal direction is in a bent shape, and the two ends of the multi-segment beam 251 are connected with the connecting seat 23 and the mounting seat 24, respectively.

[0031] In the present embodiment, the vibration isolation mechanism uses an integrally formed multi-segment beam 251 as the quasi-zero stiffness component 25 (the multi-segment beam 251 is pre-compressed to a quasi-zero stiffness state), which can be smaller in size than the quasi-zero stiffness mechanism obtained by connecting the positive stiffness element and the negative stiffness element in parallel, and can effectively save the installation space 11 of the quasi-zero stiffness mechanism, solving the problem of excessive space occupation of the traditional combined quasi-zero stiffness vibration isolator. The multi-segment beam can be integrally formed by 3D printing, injection molding or other processes.

[0032] In addition, in this embodiment, the multi-segment beam 251 carries the vibration-isolated object in the vertical direction. In this direction, the plate-like multi-segment beam 251 has a large stiffness. It can be seen that the vibration isolation mechanism of the present invention can provide good low-frequency vibration isolation performance while also having a large load-bearing stiffness, ensuring the stability of the vibration-isolated object.

[0033] In this embodiment, the multi-segment beam 251 is made of polylactic acid (PLA) and manufactured by 3D printing. Its elastic modulus E = 3.15 GPa and allowable stress σ y =49.5MPa; the multi-segment beam 251 is bent into a three-segment structure, and its horizontal cross-section has a multi-segment curved shape, such as Figure 4 As shown, the beam includes segments L1, L2, and L3 connected sequentially. The coordinates of the endpoints of segment L1, the intersection of segments L1 and L2, the intersection of segments L2 and L3, and the endpoint of segment L3 in the XY coordinate system are: n1 (40mm, 0mm), n2 (36.6mm, 22.0mm), n3 (7.8mm, 23.4mm), and n4 (0mm, 32mm), respectively. The thickness of the multi-segment beam 251 is h = 0.7mm, and its vertical height is w = 40mm. The shapes of segments L1, L2, and L3 satisfy the following formulas: , , .

[0034] The multi-segment beam 251 was compressed along the Y-axis of the coordinate system containing the multi-segment beam 251, and the static properties of the multi-segment beam 251 were measured as follows: Figure 5 As shown, the force-displacement curve of the multi-segment beam 251 in this embodiment is relatively flat within the displacement range [8mm, 18mm]. Within 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, with a ratio of 90%. The variation of the restoring force of the multi-segment beam 251 within this range is very small, approximately achieving constant force output. Furthermore, within 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, which exhibits quasi-zero stiffness characteristics within this displacement range.

[0035] As can be seen, in this embodiment, the multi-segment 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-segment beam 251 is located, so that it can be in a quasi-zero stiffness state. Accordingly, when the multi-segment beam 251 is installed in the vibration isolator, it needs to be compressed along the Y-axis direction of its coordinate system.

[0036] In one embodiment, the connecting seat 23 and the connecting arm 22 are connected at the axis of the connecting arm 22, and the mounting seat 24 and the mounting frame 1 are connected at the axis of the connecting arm 22; the quasi-zero stiffness component 25 is composed of two multi-section beams 251, one end of the two multi-section beams 251 is fixedly arranged on the same first mounting block, and the other end of the two multi-section beams 251 is fixedly connected with the second mounting block, and the two multi-section beams 251 are symmetric about the vertical plane in which the axis of the connecting arm 22 is located.

[0037] In this embodiment, the quasi-zero stiffness component 25 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 symmetric about the vertical plane in which the axis of the connecting arm 22 is located, so that the structural uniformity of the vibration isolator can be effectively improved, and the carrying capacity and structural stability of the vibration isolator can be effectively improved.

[0038] Meanwhile, in this embodiment, the two multi-section beams 251 installed in the vibration isolator are compressed in the horizontal direction of the symmetry plane, so the Y-axis of the coordinate system in which 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 in which the multi-section beam 251 installed in the vibration isolator is displaced is the Y-axis direction of the coordinate system in which the multi-section beam 251 is located, so as to maintain the quasi-zero stiffness characteristic of the multi-section beam 251.

[0039] In one embodiment, the connecting arm 22 is adjustably arranged along the axis direction of the support seat 21.

[0040] In this embodiment, the position of the connecting arm 22 can be adjusted along the axis direction, so that the compression amount of the quasi-zero stiffness component 25 can be adjusted by adjusting the position of the connecting arm 22 during the installation of the vibration isolator, and the quasi-zero stiffness component 25 can be easily brought to the quasi-zero stiffness state.

[0041] In one embodiment, the quasi-zero stiffness component 25 is detachably arranged on the mounting seat 24 and the connecting seat 23.

[0042] In this embodiment, the quasi-zero stiffness component 25 is detachably arranged on the mounting seat 24 and the connecting seat 23, so that different specifications of the quasi-zero stiffness component 25 can be replaced according to different use requirements of the vibration isolator, so that the vibration isolator has a wider range of use. 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, so as to ensure that the installed quasi-zero stiffness component 25 is in the quasi-zero stiffness state.

[0043] In the embodiment, the quasi-zero stiffness component 25 can be detachably arranged on the mounting seat 24 and the connecting seat 23 through a threaded connection structure, a plug-in structure or the like. For example, mounting grooves for embedding the first connecting block 252 and the second connecting block 253 can be formed on the connecting seat 23 and the mounting seat 24, respectively, and the quasi-zero stiffness component 25 can be detachably connected with the connecting seat 23 and the mounting seat 24 through the detachable connection structure of the first connecting block 252 and the second connecting block 253 with the mounting grooves.

[0044] In one of the embodiments, the support seat 21 is in a circular ring shape, the connecting arm 22 is arranged along the radial direction of the support seat 21, the support seat 21 is provided with a mounting hole penetrating therethrough corresponding to the connecting arm 22, one end of the connecting arm 22 towards the support seat 21 is formed with a threaded connecting rod 221, the threaded connecting rod 221 penetrates through the mounting hole, and two nuts 222 are further sleeved on the threaded connecting rod 221, and the two nuts 222 abut against the inner and outer sides of the support seat 21, respectively.

[0045] In the embodiment, the connecting arm 22 is fixedly connected with the support seat 21 through the abutment of the two nuts 222 on the connecting arm 22 with the inner and outer sides of the support seat 21, and meanwhile, the position of the connecting arm 22 relative to the support seat 21 can be adjusted by adjusting the relative positions of the threaded connecting rod 221 and the two nuts 222, so as to realize the position adjustment of the connecting arm 22 in the length direction thereof.

[0046] In one of the embodiments, one end of the connecting arm 22 away from the support seat 21 is formed with a first mounting portion 223, the first mounting portion 223 is rotatably provided with a first mounting shaft 224 through a bearing structure, the first mounting shaft 224 is vertically arranged, the connecting seat 23 is provided with a first connecting block 252 corresponding to the first mounting shaft 224, and the first connecting block 252 is fixedly connected with the first mounting shaft 224.

[0047] In the embodiment, the first connecting block 252 of the connecting seat 23 is hinged with the first mounting portion 223 of the connecting arm 22 through the first mounting shaft 224, and the connecting seat 23 can freely rotate around the axis line of the first mounting shaft 224, that is, can freely rotate in the horizontal plane relative to the connecting arm 22.

[0048] In one of the embodiments, the inner side wall of the mounting space 11 is provided with a second mounting portion 13 corresponding to the mounting seat 24, the second mounting portion 13 is rotatably provided with a second mounting shaft 131 through a bearing structure, the second mounting shaft 131 is vertically arranged, the mounting seat 24 is provided with a second connecting block 253 corresponding to the second mounting shaft 131, the second connecting block 253 is fixedly arranged on the second mounting shaft 131, and the second mounting shaft 131 and the first mounting shaft 224 are both located on the axis line of the connecting arm 22.

[0049] In the embodiment, the second connecting block 253 of the mounting seat 24 is hinged with the second mounting part 13 on the inner side wall of the mounting space 11 through the second mounting shaft 131, and the mounting seat 24 can freely rotate around the axis of the second mounting shaft 131, that is, can freely rotate in the horizontal plane relative to the mounting space 11.

[0050] In one embodiment, the number of the connecting arms 22 is double.

[0051] In the embodiment, the number of the connecting arms 22 is double, and the connecting arms 22 are uniformly arranged along the radial direction of the support seat 21 and around the support seat 21, so that the support arms are arranged in pairs on the same line, which can make the structure of the vibration isolator uniformly arranged, and effectively improve the carrying capacity and vibration isolation effect of the vibration isolator.

[0052] In one embodiment, the mounting frame 1 is in a cylindrical shape, the inner side wall of the mounting frame 1 is parallel to the outer side wall of the support seat 21, the mounting space 11 is formed between the inner side wall of the mounting frame 1, the mounting seat 24 is hinged to the inner side wall of the mounting frame 1, and the lower end of the outer side wall of the mounting frame 1 is formed with the flange 12.

[0053] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An in-plane arbitrary direction quasi-zero stiffness vibration isolator, characterized by, The mounting frame is internally formed with a mounting space in which a vibration isolation mechanism is mounted; the vibration isolation mechanism comprises a support base, the outer side wall of which is provided with a plurality of connecting arms, which are located in the same horizontal plane and are arranged away from the support base, and are uniformly arranged around the support base, and the ends of the connecting arms away from the support base are hingedly connected with connecting seats; the vibration isolation mechanism further comprises a plurality of mounting seats corresponding to the connecting seats one by one, which are located on the side of the connecting seats away from the connecting arms, and are hingedly connected with the mounting frame; the connecting seats are connected with the mounting seats through quasi-zero stiffness members, and the quasi-zero stiffness members are pre-compressed and in a quasi-zero stiffness state; the quasi-zero stiffness members are multi-segment beams, which are bent from plate-shaped structures arranged vertically and with equal thickness, and the two ends of the multi-segment beams are connected with the connecting seats and the mounting seats respectively; the hinging points of the connecting seats and the connecting arms and the hinging points of the mounting seats and the mounting frame are located on the axis of the connecting arms; the number of the multi-segment beams in the quasi-zero stiffness members is two, one end of the two multi-segment beams is fixedly arranged on a same first mounting block, and is connected with the connecting seats through the first mounting block, the other end of the two multi-segment beams is fixedly connected with second mounting blocks respectively, and is connected with the mounting seats through the first mounting block, and the two multi-segment beams are symmetrical about the vertical plane in which the axis of the connecting arms is located; the end of the connecting arm away from the support base is formed with a first mounting portion, a first mounting shaft is rotatably arranged on the first mounting portion through a bearing structure, and the first mounting shaft is arranged vertically; a second mounting portion is arranged on the inner side wall of the mounting space corresponding to the mounting seat, a second mounting shaft is rotatably arranged on the second mounting portion through a bearing structure, and the second mounting shaft is arranged vertically.

2. A quasi-zero stiffness vibration isolator for arbitrary in-plane directions according to claim 1, characterized in that, The connecting arms are arranged in the axial direction of the connecting arms and are adjustably arranged on the support base.

3. A quasi-zero stiffness isolator for arbitrary in-plane directions according to claim 2, characterized in that, The quasi-zero stiffness members are detachably arranged on the mounting seats and the connecting seats.

4. A quasi-zero stiffness isolator for arbitrary in-plane directions according to claim 2, characterized in that, The support base is in the shape of a circular ring, the connecting arms are arranged along the radial direction of the support base, the support base is provided with mounting holes penetrating the support base corresponding to the connecting arms, the end of the connecting arm facing the support base is formed with a threaded connecting rod, the threaded connecting rod penetrates the mounting hole, and two nuts are further arranged on the threaded connecting rod and abut against the inner and outer sides of the support base.

5. A quasi-zero stiffness isolator for arbitrary in-plane directions according to claim 4, characterized in that, A first connecting block is arranged on the connecting seat corresponding to the first mounting shaft, and the first connecting block is fixedly connected with the first mounting shaft.

6. A quasi-zero stiffness isolator for arbitrary in-plane directions according to claim 5, characterized in that, A second connecting block is arranged on the mounting seat corresponding to the second mounting shaft, and the second connecting block is fixedly arranged on the second mounting shaft; the second mounting shaft and the first mounting shaft are located on the axis of the connecting arm.

7. A quasi-zero stiffness isolator for arbitrary in-plane directions according to claim 6, characterized in that, The number of the connecting arms is an even number.

8. A quasi-zero stiffness isolator for arbitrary in-plane directions according to claim 7, characterized in that, The mounting frame is cylindrical, and the inner side walls of the mounting frame are arranged in parallel to the outer side walls of the support base, the mounting space is formed between the inner side walls of the mounting frame, the mounting seat is hinged to the inner side walls of the mounting frame, and the lower end of the outer side wall of the mounting frame is formed with a flange.

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