Vibration isolator, vibration isolation device and method

Abstract

The invention relates to the technical field of vibration isolation, in particular to a vibration isolator, a vibration isolation device and a vibration isolation method. The vibration isolator comprises an end plate assembly, a first elastic piece and a second elastic piece, the end plate assembly comprises an upper end plate, a middle end plate and a lower end plate, the first elastic piece and the second elastic piece are each of a thin plate structure, the top end of the first elastic piece is fixedly installed on the upper end plate, and the bottom end of the second elastic piece is fixedly installed on the middle end plate. The top end of the first elastic piece is fixedly installed on the upper end face of the middle end plate, the bottom end of the second elastic piece is fixedly installed on the upper end face of the middle end plate, the top end of the second elastic piece is fixedly installed on the lower end face of the middle end plate, the bottom end of the second elastic piece is fixedly installed on the lower end plate, the first elastic piece is arranged in the vertical horizontal plane in the first direction, and the second elastic piece is arranged in the vertical plane in the second direction. The first direction is perpendicular to the second direction. The vibration isolator is simple and compact in structure, high in space utilization rate and capable of achieving vibration isolation in three directions.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration isolation, and particularly relates to a vibration isolator, a vibration isolation device and a method. Background Art

[0002] In the fields of aerospace equipment, mechanical equipment, and architecture, vibrations can affect the normal operation and lifespan of equipment, leading to problems such as reduced equipment accuracy, affected experimental results, and disrupted operation of medical equipment. For example, in aerospace equipment, engine vibrations and external environmental vibrations can affect the safe and stable operation of the equipment; vibrations in mechanical equipment result in decreased accuracy and increased wear of components; in the construction field, external vibrations affect the normal use of precision laboratories and optical equipment.

[0003] In the field of vibration isolation, the method of parallel connection of positive and negative stiffness is usually adopted to make the vibration isolation device reach quasi-zero stiffness, thereby achieving vibration isolation. However, the structure of the parallel mechanism of positive and negative stiffness is complex and the assembly difficulty is high. The parallel connection of positive and negative stiffness requires the simultaneous integration of positive stiffness elements (such as linear springs) and negative stiffness elements (such as buckling beams, magnetic force mechanisms, or preloaded rods), resulting in a complex mechanical structure. Precise control is required for the coordinated design, machining error compensation, and dynamic characteristic matching of multiple components, increasing the manufacturing and debugging costs. Therefore, the structure of the parallel mechanism of positive and negative stiffness is not compact enough and occupies a large space, which becomes an important factor restricting its use in application environments with strict space requirements (such as inside aerospace equipment).

[0004] In addition, negative stiffness elements are sensitive to loads, and the mechanical properties of negative stiffness mechanisms (such as buckling beams or magnetic repulsion structures) are easily affected by external load fluctuations. When the load exceeds the design range, the negative stiffness may fail (for example, the buckling beam is over-deformed or the magnetic force is unstable), resulting in a sharp increase in the dynamic stiffness of the system and the loss of the quasi-zero stiffness characteristic. Moreover, the load-bearing capacity of the parallel structure of positive and negative stiffness is limited. In the parallel structure, negative stiffness elements usually bear part of the static load, but their load-bearing capacity is much lower than that of positive stiffness elements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a vibration isolator, a vibration isolation device and a method for the above-mentioned deficiencies in the prior art. The vibration isolator has a simple and compact structure, high space utilization rate, and can achieve vibration isolation in three directions.

[0006] To solve the above problems, the present invention adopts the following technical solutions:

[0007] A vibration isolator includes an end plate assembly, a first elastic member, and a second elastic member. The end plate assembly includes an upper end plate, a middle end plate, and a lower end plate. Both the first elastic member and the second elastic member are thin plate structures. The top of the first elastic member is fixedly installed on the upper end plate, and the bottom is fixedly installed on the upper surface of the middle end plate. The top of the second elastic member is fixedly installed on the lower surface of the middle end plate, and the bottom is fixedly installed on the lower end plate. The first elastic member is arranged along a first direction in a vertical horizontal plane, and the second elastic member is arranged along a second direction in a vertical plane. The first direction and the second direction are perpendicular to each other.

[0008] Preferably, the first elastic member is two parallel first buckling plates arranged between the upper end plate and the middle end plate, and the second elastic member is two parallel second buckling plates arranged between the middle end plate and the lower end plate.

[0009] Preferably, the materials of the first buckling plate and the second buckling plate are both made of stainless steel or titanium alloy.

[0010] Preferably, the upper end plate, the middle end plate, and the lower end plate are all arranged along the horizontal direction, and their sizes are the same. The three are arranged at intervals along the vertical direction.

[0011] Preferably, the lower surface of the upper end plate has two symmetrically arranged first installation grooves, the upper surface of the middle end plate has two symmetrically arranged second installation grooves. The length directions of the first installation groove and the second installation groove are both the first direction, and the first installation groove and the second installation groove are aligned in position. The lower surface of the middle end plate has two symmetrically arranged third installation grooves, and the upper surface of the lower end plate has two symmetrically arranged fourth installation grooves. The length directions of the third installation groove and the fourth installation groove are both the second direction, and the third installation groove and the fourth installation groove are aligned in position. The upper end of the first buckling plate is inserted into the first installation groove, the lower end of the first buckling plate is inserted into the second installation groove, the upper end of the second buckling plate is inserted into the third installation groove, and the lower end of the second buckling plate is inserted into the fourth installation groove.

[0012] Preferably, bolt holes communicating with the first installation groove are provided on the side wall of the upper end plate, and bolts are inserted into the bolt holes to fasten the first buckling plate in the first installation groove; bolt holes communicating with the second installation groove and the third installation groove are provided on the side wall of the middle end plate, and bolts are inserted into the bolt holes to fasten the first buckling plate in the second installation groove and the second buckling plate in the third installation groove; bolt holes communicating with the fourth installation groove are provided on the side wall of the lower end plate, and bolts are inserted into the bolt holes to fasten the second buckling plate in the fourth installation groove.

[0013] Preferably, the first mounting groove, the second mounting groove, the third mounting groove, and the fourth mounting groove have the same width; the first buckling plate and the second buckling plate have the same thickness; the range of the difference between the width of the first mounting groove and the thickness of the first buckling plate is 0.01 - 0.02 mm.

[0014] The present invention also provides a vibration isolation device, including a vibration isolation platform base, an upper cover plate, a fine-tuning elastic element, and further including the above-mentioned vibration isolator. The lower end plate of the vibration isolator is placed on the vibration isolation platform base, the upper cover plate is placed on the upper end plate of the vibration isolator, and the object to be vibration-isolated is placed on the upper end plate, driving the upper end plate to move downward to compress the vibration isolator, so that the first buckling plate and the second buckling plate enter the buckling state. The fine-tuning elastic element is arranged between the vibration isolation platform base and the upper cover plate and is used to generate deformation in the vertical direction, thereby jacking up the upper cover plate to separate the upper cover plate from the vibration isolation platform base.

[0015] Preferably, a plurality of vibration isolators are provided, and the plurality of vibration isolators are evenly distributed between the vibration isolation platform base and the upper cover plate.

[0016] The present invention also provides a vibration isolation method, using the above-mentioned vibration isolation device. The method is as follows: A plurality of vibration isolators are evenly distributed on the vibration isolation platform base, and the upper cover plate is placed on the vibration isolators, keeping the distance between the upper cover plate and the vibration isolation platform base in the range of 1 - 5 mm; The object to be vibration-isolated, which is greater than the sum of the load-bearing capacities of all vibration isolators, is placed on the upper end plate to drive the upper end plate to move downward to contact the vibration isolation platform base; Adjust the fine-tuning elastic element to jack up the upper cover plate, keeping the distance between the upper cover plate and the vibration isolation platform base in the range of 0.5 - 2 mm.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] (1) In the present invention, the first buckling plate and the second buckling plate adopt a longitudinal arrangement method, combined with a compact installation structure of the end plates (such as micron-level clearance fit and bolt fixation), greatly reducing the overall volume of the vibration isolator, solving the problems of large space occupation of traditional vibration isolators and difficulty in embedding in narrow equipment (such as satellite cabins, medical instruments), and is particularly suitable for the aerospace and miniaturized equipment fields that are sensitive to space.

[0019] (2) In the present invention, when the first buckling plate and the second buckling plate enter the buckling state, the vibration isolator has vibration isolation effects in three directions: along the vertical direction, along the direction perpendicular to the plane of the first buckling plate, and along the direction perpendicular to the plane of the second buckling plate.

[0020] (3) In the present invention, the first buckling plate and the second buckling plate are made of materials with high toughness such as high-strength metals (e.g., stainless steel, titanium alloy), etc. Combining with the non-linear energy dissipation characteristics during buckling deformation, it can effectively disperse stress concentration and inhibit fatigue damage. Cooperating with the hierarchical load-bearing design of the multi-layer structure, while maintaining high vibration isolation efficiency, it significantly extends the service life and reduces the maintenance frequency and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural view of the vibration isolator in Embodiment 1 of the present invention; Figure 2 is a schematic structural view of the lower end plate in Embodiment 1 of the present invention; Figure 3 is a schematic structural view of the vibration isolation device in Embodiment 2 of the present invention; Figure 4 is an exploded view of the vibration isolation device in Embodiment 2 of the present invention; Figure 5 is a schematic layout view of the vibration isolator in the vibration isolation device in Embodiment 2 of the present invention.

[0022] In the figures: 100 - vibration isolator, 110 - upper end plate, 120 - intermediate end plate, 130 - lower end plate, 200 - first buckling plate, 210 - second buckling plate, 211 - fourth mounting groove, 212 - bolt hole, 213 - bolt, 300 - vibration isolation platform base, 310 - upper cover plate, 320 - fine-tuning elastic element. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0025] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "connection", "setting", "installation", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Embodiment 1

[0028] As Figure 1 - Figure 2 shown, this embodiment discloses a vibration isolator 100, which includes an end plate assembly, a first elastic member, and a second elastic member. The end plate assembly includes an upper end plate 110, an intermediate end plate 120, and a lower end plate 130. Both the first elastic member and the second elastic member are thin plate structures. The top end of the first elastic member is fixedly installed on the upper end plate 110, and the bottom end is fixedly installed on the upper surface of the intermediate end plate 120. The top end of the second elastic member is fixedly installed on the lower surface of the intermediate end plate 120, and the bottom end is fixedly installed on the lower end plate 130. The first elastic member is arranged along a first direction in the vertical horizontal plane, and the second elastic member is arranged along a second direction in the vertical plane, and the first direction and the second direction are perpendicular to each other.

[0029] As Figure 1 shown, specifically, the first elastic member is two parallel first buckling plates 200 arranged between the upper end plate 110 and the intermediate end plate 120, and the second elastic member is two parallel second buckling plates 210 arranged between the intermediate end plate 120 and the lower end plate 130. The upper end plate 110, the intermediate end plate 120, and the lower end plate 130 are all arranged along the horizontal direction, and the sizes of the three are the same, all being rectangular structures, and the three are arranged at intervals along the vertical direction. The two first buckling plates 200 are symmetrically arranged along the first symmetry axis of the upper end plate 110 and the intermediate end plate 120, wherein the length direction of the first symmetry axis is the first direction. The two second buckling plates 210 are symmetrically arranged along the second symmetry axis of the intermediate end plate 120 and the lower end plate 130, wherein the length direction of the second symmetry axis is the second direction.

[0030] Furthermore, high-toughness thin metal plates are used for both the first buckling plate 200 and the second buckling plate 210. In this embodiment, the first buckling plate 200 and the second buckling plate 210 are made of stainless steel, aluminum alloy or composite material plates. During the vibration process, especially when the first buckling plate 200 and the second buckling plate 210 undergo buckling deformation, complex stress distributions will occur inside the material. High-toughness metals can better disperse these stresses, reduce the phenomenon of local stress concentration, and thus reduce the risk of fatigue damage caused by stress concentration. Since the vibration isolator needs to bear repeated loadings for a long time, its material must have good fatigue resistance. High-toughness metals have good ductility and fracture toughness, can absorb a large amount of energy without brittle fracture, and effectively extend the service life of the vibration isolator. Buckling deformation is a non-linear deformation process, in which a large amount of vibration energy can be consumed. High-toughness metals or composite materials can effectively dissipate vibration energy through this non-linear deformation while ensuring the structural strength, improving the vibration isolation effect. The application environments in fields such as aerospace and precision instruments are usually very harsh, requiring the vibration isolator to maintain stable performance in a wide temperature range, high humidity or other extreme conditions. High-toughness metals and some composite materials have excellent environmental adaptability and can meet these strict requirements. In summary, choosing high-toughness metals as the material for the buckling plate is mainly to ensure that the vibration isolator can provide efficient vibration isolation effect while having a long service life and high reliability, especially suitable for application scenarios with extremely high requirements for material performance.

[0031] Quasi-zero Stiffness (QZS) refers to a special mechanical design through which the static stiffness of the system can be made close to zero. In the field of vibration isolation, this means that the system can support the load without consuming a large amount of energy and provide effective isolation for low-frequency vibrations. Traditional vibration isolators usually have difficulty achieving efficient vibration isolation in the low-frequency range because their stiffness is relatively high. Traditional quasi-zero stiffness vibration isolators can achieve effective low-frequency vibration isolation near a specific position by cleverly combining positive stiffness and negative stiffness mechanisms, while maintaining the stability and load-bearing capacity of the structure.

[0032] In the prior art, some vibration isolators cannot actively preset the quasi-zero state of the system. For example, some traditional quasi-zero stiffness vibration isolators cannot flexibly adjust the system state according to different vibration isolation requirements, resulting in a single vibration isolation object and difficulty in being widely applied to various complex actual scenarios. In addition, in terms of material selection and structural design of vibration isolators, although the prior art has covered them, there are still deficiencies in meeting the performance requirements under different working conditions. For example, the comprehensive consideration of the elastic modulus, yield strength, and toughness of materials is not comprehensive enough, resulting in the inability of the vibration isolator to efficiently absorb and dissipate vibration energy when facing a complex and changeable vibration environment, and it is difficult to achieve a stable and reliable vibration isolation effect.

[0033] The vibration isolator 100 in this embodiment is a quasi-zero stiffness vibration isolator realized by the buckling characteristics of thin plates. The plate surfaces of the first buckling plate 200 and the second buckling plate 210 are both arranged along the vertical direction. When a vertical force is applied to the vibration isolator 100 and when this force reaches the load that can cause the first buckling plate 200 and the second buckling plate 210 to buckle, the first buckling plate 200 and the second buckling plate 210 will undergo bending deformation, and during this process, a phenomenon of compression and rebound will occur, that is, the first buckling plate 200 and the second buckling plate 210 are in a quasi-zero stiffness state in the vertical direction. At this time, the stiffness of the first buckling plate 200 and the second buckling plate 210 in the vertical direction is close to zero. At this time, the vibration isolator 100 can effectively isolate vertical vibrations.

[0034] In this embodiment, since the first buckling plate 200 and the second buckling plate 210 are in a quasi-zero stiffness state under buckling in the vertical direction, the vibration isolator 100 can carry large loads in the vertical direction. Therefore, only by placing the vibration isolation platform on the vibration isolator 100 and placing the object to be vibration isolated on the vibration isolation platform, the object to be vibration isolated can be vibration isolated.

[0035] Since the thicknesses of the first buckling plate 200 and the second buckling plate 210 are thin, generally not exceeding 0.1 mm. Therefore, their bending stiffness is low, and in the state where the vibration isolator 100 is not compressed, its fundamental frequency is not high either. After the first buckling plate 200 and the second buckling plate 210 are subjected to compressive loads and enter the buckling state, the stiffnesses of the first buckling plate 200 and the second buckling plate 210 in the horizontal direction near the equilibrium position will also become zero. Since the plate surface directions of the first buckling plate 200 and the second buckling plate 210 are perpendicular to each other, after the first buckling plate 200 and the second buckling plate 210 enter the buckling state, they can achieve vibration isolation in two different directions in the horizontal direction.

[0036] Such as Figure 1As shown, specifically, the stiffness of the first buckling plate 200 in the horizontal plane along the direction perpendicular to its plate surface (the second direction) is zero, so that vibration isolation in the second direction can be achieved. The stiffness of the second buckling plate 210 in the horizontal plane along the direction perpendicular to its plate surface (the first direction) is zero, so that vibration isolation in the first direction can be achieved.

[0037] Therefore, the vibration isolator 100 in this embodiment has a bearing capacity in the vertical direction, and can achieve vibration isolation in the vertical direction and in the first and second directions in the horizontal plane, thereby isolating vibrations in three directions and greatly improving the vibration isolation effect of the vibration isolator 100.

[0038] In this embodiment, the lower surface of the upper end plate 110 has two symmetrically arranged first installation grooves, and the two first installation grooves are symmetrically distributed along the first symmetry axis of the upper end plate 110. The upper surface of the middle end plate 120 has two symmetrically arranged second installation grooves, and the two second installation grooves are symmetrically distributed along the first symmetry axis of the middle end plate 120. The length directions of the first installation groove and the second installation groove are both the first direction, and the first installation groove and the second installation groove are aligned in position. The lower surface of the middle end plate 120 has two symmetrically arranged third installation grooves, and the two third installation grooves are symmetrically distributed along the second symmetry axis of the middle end plate 120. The upper surface of the lower end plate 130 has two symmetrically arranged fourth installation grooves 211, and the two fourth installation grooves are symmetrically distributed along the second symmetry axis of the lower end plate 130. The length directions of the third installation groove and the fourth installation groove 211 are both the second direction, and the third installation groove and the fourth installation groove 211 are aligned in position.

[0039] During installation, the upper ends of the two first buckling plates 200 are respectively inserted into the two first installation grooves, and the lower ends of the two first buckling plates 200 are respectively inserted into the two second installation grooves. The upper ends of the two second buckling plates 210 are inserted into the third installation grooves, and the lower ends of the second buckling plates 210 are inserted into the fourth installation grooves 211.

[0040] In this embodiment, two bolt holes 212 communicating with the two first installation grooves on both sides of the upper end plate 110 are provided on the side walls on both sides of the upper end plate 110. Bolts 213 are inserted into the bolt holes 212 to fasten the upper ends of the first buckling plates 200 installed in the first installation grooves. Two bolt holes 212 respectively communicating with the second installation grooves are provided on the side walls on both sides of the middle end plate 120. Bolts 213 are inserted into the bolt holes 212 to fasten the lower ends of the first buckling plates 200 in the second installation grooves; two bolt holes 212 respectively communicating with the third installation grooves are provided on the other two side walls of the middle end plate 120. Bolts 213 are inserted into the bolt holes 212 to fasten the upper ends of the second buckling plates 210 in the third installation grooves.

[0041] As Figure 2As shown, two bolt holes 212 communicating with the fourth installation groove 211 are provided on the side walls on both sides of the lower end plate 130, and bolts 213 are inserted into the bolt holes 212 to fasten the lower end of the second buckling plate 210 of the fourth installation groove 211.

[0042] In this embodiment, the widths of the first installation groove, the second installation groove, the third installation groove, and the fourth installation groove 211 are the same; the thicknesses of the first buckling plate 200 and the second buckling plate 210 are the same; the range of the difference between the width of the first installation groove (the second installation groove, the third installation groove, the fourth installation groove 211) and the thickness of the first buckling plate 200 (the second buckling plate 210) is 0.01 - 0.02 mm. Such a micron-level clearance fit can tightly connect the first buckling plate 200 and the second buckling plate 210 with each end plate, and improve the structural compactness.

[0043] During operation, the vibration isolator 100 needs to have a pre-compression force to bring the first buckling plate 200 and the second buckling plate 210 into a buckling state. Specifically, this pre-compression force can be an object to be vibration-isolated that is slightly greater than the load-bearing capacity of the vibration isolator 100, or a pre-tightening bolt arranged vertically between the upper end plate 110 and the middle end plate 120 and between the middle end plate 120 and the lower end plate 130.

[0044] Within the working range, the longitudinal stiffness of the vibration isolator 100 is close to 0, being in a quasi-zero stiffness state. In the quasi-zero stiffness state, the fundamental frequency of the vibration isolator 100 is as low as 0.1 - 5 Hz, and the lower the stiffness of the buckling plate, the lower the fundamental frequency of the vibration isolator 100. External vibration excitations that are times higher than the fundamental frequency of the vibration isolator 100 can be isolated.

[0045] In this embodiment, the vibration isolator 100 arranges the first buckling plate 200 and the second buckling plate 210 longitudinally, combined with a compact installation structure of the end plates (such as micron-level clearance fit and bolt fixation), greatly reducing the overall volume of the vibration isolator 100, solving the problems of large space occupation of traditional vibration isolators 100 and difficulty in embedding in narrow equipment (such as satellite cabins, medical instruments), and is particularly suitable for aerospace and miniaturized equipment fields that are sensitive to space. When the first buckling plate 200 and the second buckling plate 210 enter the buckling state, the vibration isolator 100 has vibration isolation effects in three directions: along the vertical direction, along the direction perpendicular to the plate surface of the first buckling plate 200, and along the direction perpendicular to the plate surface of the second buckling plate 210. In addition, the first buckling plate 200 and the second buckling plate 210 are made of high-toughness metals (such as stainless steel, titanium alloy), etc., combined with the non-linear energy dissipation characteristics during buckling deformation, which can effectively disperse stress concentration and inhibit fatigue damage. With the hierarchical load-bearing design of the multi-layer structure, while maintaining high vibration isolation efficiency, the service life is significantly extended, and the maintenance frequency and cost are reduced.

[0046] In addition, the vibration isolator 100 in this embodiment has a quasi-zero stiffness that is precisely adjustable and stronger adaptability. Through the optimization of the structural parameters of the buckling plates (such as thickness, material, elastic modulus) and the multi-layer combination design, the quasi-zero stiffness state of the system can be actively preset to achieve efficient isolation of low-frequency vibrations. This design supports flexible adjustment of the stiffness characteristics according to the actual working conditions, expands the applicable range of the vibration isolator 100, and can adapt to the complex vibration isolation requirements of different scenarios such as aerospace and precision instruments.

[0047] Embodiment 2

[0048] This embodiment discloses a vibration isolation device, which includes a vibration isolation platform base 300, an upper cover plate 310, and a fine-tuning elastic element 320. It also includes the vibration isolator 100 in Embodiment 1. The lower end plate 130 of the vibration isolator 100 is placed on the vibration isolation platform base 300, and the upper cover plate 310 is placed on the upper end plate 110 of the vibration isolator 100. The object to be vibration-isolated is placed on the upper end plate 110, thereby providing a vertical pressure to drive the upper end plate 110 to move downward to compress the vibration isolator 100, so that the first buckling plate 200 and the second buckling plate 210 enter the buckling state. The fine-tuning elastic element 320 is arranged between the vibration isolation platform base 300 and the upper cover plate 310 and is used to generate a vertical deformation, thereby jacking up the upper cover plate 310 to separate the upper cover plate 310 from the vibration isolation platform base 300. Among them, the fine-tuning elastic element 320 can be an air spring, an electromagnetic spring, a mechanical spring or other elastic elements.

[0049] As Figure 3 、 Figure 4 shown, a plurality of vibration isolators 100 are provided, and the plurality of vibration isolators 100 are evenly distributed between the vibration isolation platform base 300 and the upper cover plate 310. Correspondingly, a plurality of fine-tuning elastic elements 320 are provided, and the plurality of fine-tuning elastic elements 320 are evenly distributed between the vibration isolation platform base 300 and the upper cover plate 310.

[0050] It should be noted that the plurality of vibration isolators 100 are all the same. By evenly arranging the plurality of vibration isolators 100 on the vibration isolation platform base 300, the weight of the upper cover plate 310 can be evenly shared, and the deformation of the upper cover plate 310 caused by uneven force can be reduced. Specifically, the plurality of vibration isolators 100 can adopt a form of multi-row equidistant distribution.

[0051] As Figure 5As shown, in this embodiment, the vibration isolation platform base 300 is a rectangular structure with a length of a and a width of b. A total of 18 vibration isolators 100 are arranged on the vibration isolation platform base 300. Among them, 4 vibration isolators 100 are arranged in the first row, and the distance between two adjacent vibration isolators 100 is a / 4; 3 vibration isolators 100 are arranged in the second row, and the distance between two adjacent vibration isolators 100 is a / 4; 4 vibration isolators 100 are arranged in the third row, and the distance between two adjacent vibration isolators 100 is a / 4; 3 vibration isolators 100 are arranged in the fourth row, and the distance between two adjacent vibration isolators 100 is a / 4; 4 vibration isolators 100 are arranged in the fifth row, and the distance between two adjacent vibration isolators 100 is a / 4. Among them, the distance between two adjacent rows of vibration isolators 100 is b / 5, and the vibration isolators 100 between two adjacent rows are arranged staggeredly in the horizontal direction. The distance between the first row and one side edge of the vibration isolation platform base 300 is b / 10, and the distance between the fifth row and the other side edge of the vibration isolation platform base 300 is b / 10.

[0052] Further, the vibration isolators 100 in the first row, the third row, and the fifth row correspond to each other in position, and the vibration isolators 100 in the second row and the fourth row correspond to each other in position. The distance from the leftmost vibration isolator 100 in the first row, the third row, and the fifth row to the side edge of the vibration isolation platform base 300 is a / 8; the distance from the rightmost vibration isolator 100 in the first row, the third row, and the fifth row to the other side edge of the vibration isolation platform base 300 is a / 8.

[0053] Of course, this is only one arrangement method of the vibration isolators 100, and other uniform distribution methods can also be used to meet the requirements. In this embodiment, a total of four fine-tuning elastic elements 320 are provided, and the four fine-tuning elastic elements 320 are evenly distributed between the vibration isolation platform base 300 and the upper cover plate 310.

[0054] In this embodiment, each vibration isolator 100 has the same load-bearing capacity. The weight of the object to be vibration-isolated should be slightly greater than the sum of the load-bearing capacities of all the vibration isolators 100. Thus, when the object to be vibration-isolated is placed on the upper cover plate 310, a vertically downward pressing force can be provided to drive the upper cover plate 310 to move downward, thereby compressing the vibration isolators 100, and further enabling the first buckling plate 200 and the second buckling plate 210 of all the vibration isolators 100 to be in a buckled state, so as to achieve quasi-zero stiffness. The upper cover plate 310 can be slightly lifted by adjusting the multiple fine-tuning elastic elements 320, so that the upper cover plate 310 is in contact with the vibration isolators 100, and while keeping the first buckling plate 200 and the second buckling plate 210 of the vibration isolators 100 in a buckled state, the upper cover plate 310 is prevented from contacting the vibration isolation platform base 300.

[0055] In this embodiment, the vibration isolation device evenly arranges a plurality of vibration isolators 100 on the vibration isolation platform base 300 to evenly share the weight of the upper cover plate 310, and can have vibration isolation effects in three directions: along the vertical direction, along the direction perpendicular to the plate surface of the first buckling plate 200 (the second direction), and along the direction perpendicular to the plate surface of the second buckling plate 210 (the first direction). Thus, it is ensured that the vibration from the vibration isolation platform base 300 will not be transmitted to the upper cover plate 310 and the object to be vibration isolated, achieving a good vibration isolation effect for the object to be vibration isolated. The vibration isolation device in this embodiment is applicable to the vibration isolation of precision optical instruments, precision manufacturing equipment, etc.

[0056] In this embodiment, the vibration isolators 100 of the vibration isolation device arrange the first buckling plate 200 and the second buckling plate 210 in a longitudinal arrangement manner, combined with a compact installation structure of the end plates (such as micron-level clearance fit and bolt fixation), greatly reducing the overall volume of the vibration isolators 100, solving the problems of large space occupation and difficulty in embedding in narrow equipment (such as satellite cabins and medical instruments) of traditional vibration isolators 100, and is particularly suitable for the aerospace and miniaturized equipment fields that are sensitive to space.

[0057] In addition, the first buckling plate 200 and the second buckling plate 210 are made of materials with high toughness (such as stainless steel and titanium alloy), etc. Combining with the non-linear energy dissipation characteristics during buckling deformation, stress concentration can be effectively dispersed and fatigue damage can be inhibited. With the hierarchical load-bearing design of the multi-layer structure, while maintaining high vibration isolation efficiency, the service life is significantly extended, and the maintenance frequency and cost are reduced.

[0058] In this embodiment, the vibration isolation device can make the system exhibit the characteristics of quasi-zero stiffness under the working state by optimizing the design parameters of the buckling plate (such as thickness and material selection), thereby effectively isolating low-frequency vibration and having the ability of dynamic adjustment. By optimizing the structural parameters of the buckling plate and adopting a multi-layer combined design, the stiffness characteristics of the vibration isolator can be flexibly adjusted according to the actual application scenario to meet different vibration isolation requirements.

[0059] Embodiment 3

[0060] This embodiment discloses a vibration isolation method, which uses the vibration isolation device in Embodiment 2. The method is as follows: Evenly distribute a plurality of vibration isolators 100 on the vibration isolation platform base 300, and place the upper cover plate 310 on the vibration isolators 100, keeping the distance between the upper cover plate 310 and the vibration isolation platform base 300 in the range of 1 - 5 mm; Place the object to be vibration isolated, which is greater than the sum of the load-bearing capacities of all the vibration isolators 100, on the upper end plate 110 to drive the upper end plate 110 to move downward and contact the vibration isolation platform base 300; Adjust the fine-tuning elastic element 320 to jack up the upper cover plate 310 upward, and keep the distance between the upper cover plate 310 and the vibration isolation platform base 300 within the range of 0.5 - 2 mm.

[0061] Specifically, first determine the weight of the object to be vibration-isolated, through the materials and dimensions of the first buckling plate 200 and the second buckling plate 210, and use finite element analysis to obtain the fundamental frequency of the vibration isolator 100 according to the above characteristics, so as to obtain the thicknesses of the first buckling plate 200 and the second buckling plate 210;

[0062] Select the parameters of the appropriate buckling plates (rated load, vibration fundamental frequency, and quantity) so that the sum of the rated loads of all the vibration isolators 100 is slightly less than the weight of the object to be vibration-isolated;

[0063] Distribute multiple vibration isolators 100 on the vibration isolation platform base 300 in multiple rows at equal intervals to evenly share the weight of the upper cover plate 310;

[0064] Select appropriate fine-tuning elastic elements 320 so that the total maximum rated load of the multiple fine-tuning elastic elements 320 is greater than the difference between the weight of the object to be vibration-isolated and the sum of the rated loads of the multiple vibration isolators 100, and evenly distribute the fine-tuning elastic elements 320 on the vibration isolation platform base 300;

[0065] Cover the upper cover plate 310 on multiple vibration isolators 100, and keep the gap between the upper cover plate 310 and the vibration isolation platform base 300 within the range of 1 - 5 mm (the gap can be customized according to the vibration amplitude of the vibration source);

[0066] Place the object to be vibration-isolated on the upper cover plate 310, and the center of gravity position of the object to be vibration-isolated is at the center of the upper cover plate 310;

[0067] In the non-working state (when the fine-tuning elastic element 320 has no supporting force), the weight of the object to be vibration-isolated is greater than the total rated load of the multiple vibration isolators 100, so the upper cover plate 310 will sink and contact the vibration isolation platform base 300 (the gap becomes 0). At this time, the vibration isolator 100 is in a buckled state under the external load, and its dynamic stiffness is close to 0;

[0068] During work, start the fine-tuning elastic element 320, adjust the magnitude of its output force to make the upper cover plate 310 float and keep a gap of 0.5 - 2 mm from the vibration isolation platform base 300. At this time, the vibration isolation device can fully bear the weight of the object to be vibration-isolated and maintain a quasi-zero stiffness, realizing efficient low-frequency vibration isolation and isolating the environmental vibrations in the vertical direction, the first direction, and the second direction;

[0069] This vibration isolation device can also be used to isolate the vibration of the object to be vibration-isolated on the upper cover plate 310 from being transmitted to the vibration isolation platform base 300.

[0070] It should be noted that this vibration isolation platform is applicable to the situation where the mass of the object to be vibration isolated does not change significantly during use.

[0071] The vibration isolation method in this embodiment can achieve large-load vibration isolation in the vertical direction and vibration isolation in the first and second directions within the horizontal plane, thereby achieving three-way vibration isolation, and further achieving a good load-bearing effect on the object to be vibration isolated through a simple structure. It can be widely applied to fields such as aerospace and precision instrument manufacturing, where the requirements for low-frequency vibration isolation are extremely high. In addition, the compact design of the vibration isolator also makes it an ideal choice in environments with limited space.

[0072] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A vibration isolator, characterized in that, It includes an end plate assembly, a first elastic member, and a second elastic member. The end plate assembly includes an upper end plate, a middle end plate, and a lower end plate. Both the first elastic member and the second elastic member are thin plate structures. The top end of the first elastic member is fixedly installed on the upper end plate, and the bottom end is fixedly installed on the upper surface of the middle end plate. The top end of the second elastic member is fixedly installed on the lower surface of the middle end plate, and the bottom end is fixedly installed on the lower end plate. The first elastic member is arranged along a first direction in a vertical horizontal plane, and the second elastic member is arranged along a second direction in a vertical plane. The first direction and the second direction are perpendicular to each other.

2. The vibration isolator according to claim 1, wherein, The first elastic member is two parallel first buckling plates arranged between the upper end plate and the middle end plate, and the second elastic member is two parallel second buckling plates arranged between the middle end plate and the lower end plate.

3. The vibration isolator according to claim 2, wherein The materials of the first buckling plate and the second buckling plate are both made of stainless steel or titanium alloy.

4. The vibration isolator according to claim 3, wherein The upper end plate, the middle end plate, and the lower end plate are all arranged along the horizontal direction, and the sizes of the three are the same. The three are arranged at intervals along the vertical direction.

5. The vibration isolator according to claim 2, characterized in that, The lower surface of the upper end plate has two symmetrically arranged first installation grooves. The upper surface of the middle end plate has two symmetrically arranged second installation grooves. The length directions of the first installation grooves and the second installation grooves are both the first direction, and the first installation grooves and the second installation grooves are aligned in position. The lower surface of the middle end plate has two symmetrically arranged third installation grooves. The upper surface of the lower end plate has two symmetrically arranged fourth installation grooves. The length directions of the third installation grooves and the fourth installation grooves are both the second direction, and the third installation grooves and the fourth installation grooves are aligned in position. The upper end of the first buckling plate is inserted into the first installation groove, the lower end of the first buckling plate is inserted into the second installation groove, the upper end of the second buckling plate is inserted into the third installation groove, and the lower end of the second buckling plate is inserted into the fourth installation groove.

6. The vibration isolator according to claim 5, characterized in that, A bolt hole communicating with the first installation groove is provided on the side wall of the upper end plate, and a bolt is inserted into the bolt hole to fasten the first buckling plate in the first installation groove. Bolt holes communicating with the second installation groove and the third installation groove are provided on the side wall of the middle end plate, and bolts are inserted into the bolt holes to fasten the first buckling plate in the second installation groove and the second buckling plate in the third installation groove. A bolt hole communicating with the fourth installation groove is provided on the side wall of the lower end plate, and a bolt is inserted into the bolt hole to fasten the second buckling plate in the fourth installation groove.

7. The vibration isolator according to claim 6, wherein The widths of the first installation groove, the second installation groove, the third installation groove, and the fourth installation groove are the same. The thicknesses of the first buckling plate and the second buckling plate are the same. The range of the difference between the width of the first installation groove and the thickness of the first buckling plate is 0.01 - 0.02 mm.

8. A vibration isolation device, comprising a vibration isolation platform base, an upper cover plate, and a fine-tuning elastic element, characterized in that, It further includes the vibration isolator according to any one of claims 2-7. The lower end plate of the vibration isolator is placed on the vibration isolation platform base, and the upper cover plate is placed on the upper end plate of the vibration isolator. The object to be vibration-isolated is placed on the upper end plate, driving the upper end plate to move downward to compress the vibration isolator, so that the first buckling plate and the second buckling plate enter the buckling state. The fine-tuning elastic element is arranged between the vibration isolation platform base and the upper cover plate, and is used to generate deformation in the vertical direction, thereby jacking up the upper cover plate so that the upper cover plate is separated from the vibration isolation platform base.

9. The vibration isolation device according to claim 8, wherein, There are multiple vibration isolators, and the multiple vibration isolators are evenly distributed between the vibration isolation platform base and the upper cover plate.

10. A vibration isolation method, characterized in that, Using the vibration isolation device according to claim 9, the method is as follows: Evenly distribute multiple vibration isolators on the vibration isolation platform base, and place the upper cover plate on the vibration isolators, keeping the distance between the upper cover plate and the vibration isolation platform base in the range of 1-5 mm; Place the object to be vibration-isolated, whose weight is greater than the sum of the load-bearing capacities of all vibration isolators, on the upper end plate to drive the upper end plate to move downward to contact the vibration isolation platform base; Adjust the fine-tuning elastic element to jack up the upper cover plate, keeping the distance between the upper cover plate and the vibration isolation platform base in the range of 0.5-2 mm.

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