Square three-dimensional vibration isolator based on composite dot matrix structure

Abstract

The square three-dimensional vibration isolator based on composite dot matrix structure belongs to the field of three-dimensional vibration isolators; comprising an upper end cover, a base, an upper circular ring metal dot matrix structure, a lower circular ring metal dot matrix structure, a cuboid metal dot matrix structure, a cuboid fixing piece, a lower end cover, a fastening screw and a limiting ring, the upper circular ring metal dot matrix structure, the lower circular ring metal dot matrix structure and the cuboid metal dot matrix structure are all BCC-B dot matrix structures, and the BCC cell structure beam and the 1 / 8 ball unit spherical surface of the BCC-B dot matrix structure are coated with high-performance damping material; the application effectively improves the stress concentration effect of the BCC dot matrix structure, greatly improves the carrying capacity of the vibration isolator, realizes the functions of three-dimensional vibration isolation and impact resistance through structural design, and solves the problem that the prior art cannot meet the three-dimensional vibration isolation demand of light and compact, low stiffness and large carrying capacity in harsh environments such as radiation and high temperature aging.

Description

Technical Field

[0001] This invention belongs to the field of three-dimensional vibration isolators, and mainly relates to a square three-dimensional vibration isolator based on a composite lattice structure. Background Technology

[0002] The main challenges in vibration isolation for high-end equipment in aerospace, shipbuilding, and other industries lie in the following aspects: First, the complexity and high precision of these high-end equipment systems impose stringent requirements on environmental vibration; second, these high-end equipment often face extremely complex environmental conditions, such as impact, swaying, radiation, and high and low temperatures, requiring vibration isolators to have three-dimensional vibration isolation capabilities, and placing high demands on the radiation resistance and aging resistance of the vibration isolation system and its components; third, due to limitations in space and effective load, the vibration isolation components for these high-end equipment are required to be lightweight, compact, low stiffness, and have a high load-bearing capacity.

[0003] Metal-rubber vibration isolators possess the characteristics of being lightweight, having a high load-bearing capacity, low stiffness, high damping, and radiation resistance, and have been widely used in aerospace, shipbuilding, transportation, and automotive fields. However, because metal-rubber specimens are formed by stamping and pressing wound metal spiral wires, the internal metal wires are randomly interlocked, making it impossible to establish accurate theoretical and simulation models. Therefore, their performance is often obtained through experiments during design. Furthermore, during use, the internal friction of the metal wires severely affects the service life of metal-rubber vibration isolators. In addition, due to the special stamping process of metal-rubber, it can only function in the stamping direction, and cannot achieve three-dimensional vibration isolation. The patent with patent number 202011331683.0 proposes a high load-bearing metal-rubber composite vibration isolator with three-dimensional stiffness damping decoupling. It achieves three-dimensional vibration isolation capability through structural design. In addition to the problems of the metal rubber itself, the following problems still exist: (1) The transverse and longitudinal vibration isolation functions are realized by the transverse and longitudinally installed metal rubbers respectively. When the external vibration load is large, the volume of the vibration isolator has to be increased, which is not conducive to the compact design of the vibration isolator; (2) When the vibration isolator is subjected to tensile force, no limiting device design is carried out, which can easily lead to the damage of the first vertical metal rubber bearing the tensile force, thereby losing the vibration isolation function under tensile force.

[0004] Lattice structures are lightweight and high-strength, formed by a periodic array of cell structures. Compared to metal-rubber structures, they are easier to design and manufacture, and possess isotropic properties, making them a promising alternative to metal-rubber vibration isolation elements. However, their damping effect is relatively poor (damping ratio around 0.02). Patent application number 202310000470.7 proposes a high-damping variable-stiffness BCC lattice composite structure vibration damper. This damper consists of a lattice composite structure and a base. Damping is increased by filling the lattice structure with a viscoelastic material based on epoxy resin / polyurethane. The stiffness is freely adjustable within the range of 69kN / mm to 276kN / mm through effective control of the lattice structure's pore shape parameters and porosity. However, the following shortcomings exist in this scheme: (1) Although the damping is increased by filling with viscoelastic material, the mass of the lattice structure after filling with viscoelastic material is also greatly increased; (2) For ultra-precision high-end equipment in aerospace, shipbuilding and other fields, the vibration isolation performance of the vibration isolator is high, so its stiffness needs to be further reduced; (3) This scheme can only achieve vibration isolation effect in one direction, which cannot meet the three-dimensional vibration isolation requirements of high-end equipment in aerospace, shipbuilding and other fields; (4) Due to the stress concentration effect at its nodes, the load-bearing capacity of the BCC lattice structure is severely restricted.

[0005] In summary, three-dimensional vibration isolators for large, high-end equipment in aerospace, shipbuilding, and other fields cannot meet the requirements of lightweight, compact, low stiffness, high load-bearing capacity, three-dimensional vibration isolation, impact resistance, radiation resistance, and aging resistance. Therefore, it is urgent to propose three-dimensional vibration isolators that can meet the above requirements in order to satisfy the vibration isolation needs of high-end equipment in aerospace, shipbuilding, and other fields. Summary of the Invention

[0006] The purpose of this invention is to address the problem that existing technologies cannot meet the requirements of aerospace, shipbuilding and other fields for vibration isolators, which require lightweight and compact materials, high load-bearing capacity, low stiffness, radiation resistance, aging resistance and three-dimensional vibration isolation. The invention proposes a square three-dimensional vibration isolator based on a lattice structure that is lightweight and compact, has high load-bearing capacity, low stiffness, and strong radiation resistance and aging resistance. This invention aims to meet the needs of high-end equipment in aerospace, shipbuilding and other fields with harsh environmental conditions for high-load three-dimensional vibration isolators.

[0007] The objective of this invention is achieved as follows:

[0008] A square three-dimensional vibration isolator based on a composite lattice structure includes an upper end cover, a base, an upper annular metal lattice structure, a lower annular metal lattice structure, a cuboid metal lattice structure, cuboid fixing members, a lower end cover, fastening screws, and a limiting ring. The upper end cover has a cuboid cavity inside, and a cylindrical sleeve is contained within the cuboid cavity. The cylindrical sleeve is coaxial with the central axis of the cuboid cavity, and threaded holes of the same size are formed inside the cylindrical sleeve extending to the upper end face of the upper end cover. The four cuboid metal lattice structures are installed in four mounting slots on the base via corresponding cuboid fixing members. The lower bottom surface contacts the lower end face of the cuboid metal lattice structure; the upper annular metal lattice structure is installed in the circular groove A of the base, the thickness of the upper annular metal lattice structure is greater than the depth of the circular groove A, the lower end face of the upper annular metal lattice structure contacts the upper end face of the mounting plate, and the outer diameter of the upper annular metal lattice structure is equal to the diameter of the circular groove A; a limiting ring is installed below the mounting plate, the upper surface of the limiting ring is fixedly connected to the mounting plate, and the outer cylindrical surface of the limiting ring is fixedly connected to the side of the cylindrical cavity below the mounting plate of the base; the lower annular metal lattice structure is installed on the base. Below the mounting plate, the upper end face of the lower annular metal dot matrix structure contacts the lower end face of the mounting plate, and the outer cylindrical surface of the lower annular metal dot matrix structure contacts the inner surface of the limiting ring; the thickness of the lower annular metal dot matrix structure is greater than the thickness of the limiting ring; the outer diameter of the cylindrical sleeve is equal to the inner diameter of the upper annular metal dot matrix structure and the lower annular metal dot matrix structure; a lower end cover is installed below the lower annular metal dot matrix structure, and a circular groove B is formed on the lower end cover. The upper end face of the lower end cover contacts the lower end face of the lower annular metal dot matrix structure, and the upper end face of the circular groove B contacts the inner surface of the limiting ring. The lower end faces of the cylindrical sleeves are in contact; the diameter of the central hole of the mounting plate is larger than the outer diameter of the cylindrical sleeve; the cylindrical surface of the circular groove B leaves a certain gap with the outer wall of the cylindrical sleeve; the outer diameter of the lower end cover is smaller than the diameter of the cylindrical cavity below the mounting plate of the base; the diameter of the cylindrical cavity enclosed by the mounting plate is larger than the diameter of the cylindrical sleeve; the nut of the fastening screw presses on the lower end face of the lower end cover; the threaded hole of the cylindrical sleeve on the upper end cover cooperates with the fastening screw, thereby connecting the upper end cover with the upper annular metal lattice structure, the lower annular metal lattice structure and the four cuboid metal lattice structures.

[0009] Preferably, the upper annular metal lattice structure, the lower annular metal lattice structure, and the four cuboid metal lattice structures are all BCC-B lattice structures.

[0010] Preferably, the BCC-B lattice structure includes BCC cell structure beams, with 1 / 8 spherical units fixed at both ends of the BCC cell structure beams. The 1 / 8 spherical units at the inner ends of the eight BCC cell structure beams are fixed together to form an integral spherical node BCC-B cell structure. The BCC-B cell structure is periodically arrayed to form a BCC-B lattice structure.

[0011] Preferably, the relationship between the beam diameter d of the BCC cell structure and the external dimension L of the BCC-B cell structure should satisfy 0.075 ≤ d / L ≤ 0.15; the diameter b of the solid sphere at the node of the BCC-B cell structure should satisfy...

[0012] Preferably, the BCC cell structure beams and 1 / 8 spherical units of the BCC-B lattice structure are coated with high-performance damping material.

[0013] Preferably, the material of the BCC-B lattice structure is a 3D-printable metal material, including 304 stainless steel, 316L stainless steel, and Ti-6Al-4V.

[0014] The advantages of this invention are as follows:

[0015] (1) This invention solves the problem that existing technologies cannot meet the requirements of lightweight, compact, high load-bearing capacity, impact resistance, radiation resistance, aging resistance, and three-dimensional vibration isolation for vibration isolators in aerospace, shipbuilding, and other fields. This invention proposes a three-dimensional vibration isolator consisting of an upper end cover, a base, an upper circular annular metal lattice structure, a lower circular annular metal lattice structure, a cuboid metal lattice structure, a cuboid fixing component, a lower end cover, fastening screws, and a limiting ring. Through structural design, it achieves three-dimensional vibration isolation function and can cope with vibration isolation and protection during swaying and attitude transformation. At the same time, it can achieve limiting protection function under large impact. Its internal lattice structure is made of metal that can be 3D printed, achieving lightweight, compact, radiation-resistant, and aging-resistant capabilities.

[0016] (2) This invention improves the stress concentration effect of the BCC lattice structure, thereby greatly enhancing its load-bearing capacity and reducing the natural frequency of the isolator. By fixing 1 / 8 spherical units to both ends of the BCC cell structure beams of the BCC lattice vibration isolation structure, and by fixing the 1 / 8 spherical units at the inner ends of the eight BCC cell structure beams together to form an integral spherical node BCC-B cell structure, the stress concentration effect of the BCC lattice vibration isolation structure is effectively improved. At the same time, by coating the outer side of the cell structure beams and the spherical surface of the 1 / 8 spherical units with high-performance damping materials, the damping performance of the isolator is increased. Under the premise of the same cell structure dimensions, compared with the BCC lattice structure, the load-bearing capacity of the BCC-B lattice structure proposed in this invention can be increased by more than 30%. Compared with the vibration isolator composed of the BCC lattice structure, this solution can significantly reduce the size of the vibration isolator, reduce the natural frequency by more than 10%, and increase the damping ratio to more than 0.08. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a square three-dimensional vibration isolator based on a lattice structure.

[0018] Figure 2 This is a top view of a square three-dimensional vibration isolator based on a lattice structure.

[0019] Figure 3 This is a front view of a square three-dimensional vibration isolator based on a lattice structure.

[0020] Figure 4 for Figure 3 Schematic diagram of the AA section;

[0021] Figure 5 This is an isometric view of the upper end cap structure;

[0022] Figure 6 This is a schematic diagram of the internal structure of the upper end cap;

[0023] Figure 7 This is a schematic diagram of the base structure of a square three-dimensional vibration isolator based on a lattice structure.

[0024] Figure 8 This is a top view of the base structure of a square three-dimensional vibration isolator based on a lattice structure.

[0025] Figure 9 for Figure 8 Schematic diagram of the BB cross section;

[0026] Figure 10 This is a schematic diagram of the lower end cap;

[0027] Figure 11 A schematic diagram of a BCC cell structure beam with 1 / 8 sphere units fixed at both ends.

[0028] Figure 12 A schematic diagram of the BCC-B cell structure;

[0029] Figure 13 A schematic diagram of a BCC-B cell structure with high-performance damping material coated on the surface of a BCC cell structure beam and a 1 / 8 spherical unit.

[0030] Figure 14 for Figure 12 The diagram shows a BCC-B lattice structure formed by a periodic array of BCC-B cell structures.

[0031] Figure 15 This is a schematic diagram of the BCC-B cell structure dimensions.

[0032] Figure reference numerals:

[0033] 1. Upper end cap, 2. Base, 3. Upper circular metal dot matrix structure, 4. Lower circular metal dot matrix structure, 5. Cuboid metal dot matrix structure, 6. Cuboid fastener, 7. Lower end cap, 8. Fastening screw, 9. Limiting ring.

[0034] 101. Threaded hole; 102. Cylindrical sleeve; 103. Upper end face; 104. Bottom surface of upper end cap; 105. Inner side of upper end cap.

[0035] 201. Mounting hole; 202. Circular groove A; 203. Mounting slot; 204. Mounting plate; 205. Top surface; 206. Side surface;

[0036] 301, 1 / 8 sphere unit; 302, BCC cell structure beam; 303, high-performance damping material;

[0037] 701. Upper end face of the lower end cap; 702. Circular groove B;

[0038] 20301, bottom surface of the mounting groove; 70201, cylindrical surface of the circular groove B;

[0039] L represents the external dimensions of the BCC-B cell structure, and d represents the diameter of the beam in the BCC cell structure. Detailed Implementation

[0040] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, specific examples, and comparative examples.

[0041] Example 1

[0042] This invention provides a square three-dimensional vibration isolator based on a composite lattice structure, such as... Figures 1-15As shown, the system includes an upper end cap 1, a base 2, an upper annular metal dot matrix structure 3, a lower annular metal dot matrix structure 4, a cuboid metal dot matrix structure 5, a cuboid fixing member 6, a lower end cap 7, fastening screws 8, and a limiting ring 9. The upper end cap 1 has a cuboid cavity inside, and a cylindrical sleeve 102 is contained inside the cuboid cavity. The cylindrical sleeve 102 is coaxial with the central axis of the cuboid cavity, and threaded holes 101 of the same size are opened inside the cylindrical sleeve 102 to the upper end face 103 of the upper end cap 1. The four cuboid metal dot matrix structures 5 are installed on the base 2 through the corresponding cuboid fixing members 6. Within the groove 203, the lower bottom surface 20301 of the mounting groove 203 contacts the lower end surface of the cuboid metal lattice structure 5; the upper annular metal lattice structure 3 is installed within the circular groove A202 of the base 2, the thickness of the upper annular metal lattice structure 3 is greater than the depth of the circular groove A202, the lower end surface of the upper annular metal lattice structure 3 contacts the upper end surface of the mounting plate 204, and the outer diameter of the upper annular metal lattice structure 3 is equal to the diameter of the circular groove A202; a limiting ring 9 is installed below the mounting plate 204, the upper surface of the limiting ring 9 is fixedly connected to the mounting plate 204, and the outer cylindrical surface of the limiting ring 9... The lower annular metal lattice structure 4 is fixedly connected to the cylindrical cavity side of the mounting plate 204 below the base 2; the lower annular metal lattice structure 4 is installed below the mounting plate 204 of the base 2, the upper end face of the lower annular metal lattice structure 4 is in contact with the lower end face of the mounting plate 204, and the outer cylindrical surface of the lower annular metal lattice structure 4 is in contact with the inner surface of the limiting ring 9; the thickness of the lower annular metal lattice structure 4 is greater than the thickness of the limiting ring 9; the outer diameter of the cylindrical sleeve 102 is equal to the inner diameter of the upper annular metal lattice structure 3 and the lower annular metal lattice structure 4; a lower end is installed below the lower annular metal lattice structure 4. The lower end cover 7 has a circular groove B702. The upper end face 701 of the lower end cover 7 is in contact with the lower end face of the lower annular metal dot matrix structure 4. The upper end face of the circular groove B702 is in contact with the lower end face of the cylindrical sleeve 102. The diameter of the central hole of the mounting plate 204 is larger than the outer diameter of the cylindrical sleeve 102. The cylindrical surface 70201 of the circular groove B702 has a certain gap with the outer wall of the cylindrical sleeve 102. The outer diameter of the lower end cover 7 is smaller than the diameter of the cylindrical cavity below the mounting plate 204 of the base 2. The diameter of the cylindrical cavity enclosed by the mounting plate 204 is larger than the diameter of the cylindrical sleeve 102.The nut of the fastening screw 8 presses against the lower end face of the lower end cover 7, and the threaded hole 101 of the cylindrical sleeve 102 on the upper end cover 1 engages with the fastening screw 8, thereby connecting the upper end cover 1 with the upper annular metal lattice structure 3, the lower annular metal lattice structure 4, and the four cuboid metal lattice structures 5.

[0043] The upper annular metal lattice structure 3, the lower annular metal lattice structure 4, and the four cuboid metal lattice structures 5 are all BCC-B lattice structures.

[0044] The BCC-B lattice structure includes BCC cell structure beams 302, with 1 / 8 spherical units 301 fixed at both ends of the BCC cell structure beams 302. The 1 / 8 spherical units 301 on the inner ends of the eight BCC cell structure beams 302 are fixed together to form an integral spherical node BCC-B cell structure. The BCC-B cell structure is periodically arrayed to form a BCC-B lattice structure.

[0045] The relationship between the diameter d of the BCC cell structure beam 302 and the external dimension L of the BCC-B cell structure should satisfy 0.075 ≤ d / L ≤ 0.15; the diameter b of the solid sphere at the node of the BCC-B cell structure should satisfy...

[0046] The BCC-B lattice structure BCC cell structure beam 302 and 1 / 8 sphere unit 301 are coated with high-performance damping material 303 on their spherical surfaces.

[0047] The BCC-B lattice structure is made of 3D-printable metal materials, including 304 stainless steel, 316L stainless steel, and Ti-6Al-4V.

[0048] In use, the vibration isolator proposed in this invention is installed between the foundation and the equipment to be isolated. Specifically, it is connected to the foundation through the mounting holes 201 on the base 2, and connected to the equipment to be isolated through the threaded holes 101 on the upper end cover 1 using screws. As a preferred embodiment, the high-performance damping material 303 coated on the BCC cell structure beam 302 and the 1 / 8 spherical unit sphere 301 of the BCC-B lattice structure is a high-performance damping polyurea material. As a preferred embodiment, the material selected for the BCC-B lattice structure is Ti-6Al-4V.

[0049] When the external vibration is low-amplitude, and the isolator is subjected to pressure, the upper end cover 1 compresses the upper annular metal lattice structure 3, at which time the upper annular metal lattice structure 3 plays the main vibration isolation role. When the isolator is subjected to tension, the upper end cover 1, through the cylindrical sleeve 102 installed on the upper end cover 1, drives the fastening screw 8 that cooperates with the cylindrical sleeve 102 to move upward. The fastening screw 8, through its nut, drives the lower end cover 7 to move upward, thereby generating pressure on the lower annular metal lattice structure 4. At this time, the lower annular metal lattice structure 4 plays the main vibration isolation role. When the isolator is subjected to lateral pressure, the cylindrical sleeve 102 located on the upper end cover 101 compresses the upper annular metal lattice structure 3 and the lower annular metal lattice structure 4. At the same time, the upper end cover 1 compresses the corresponding cuboid shape. The metal lattice structure 5, consisting of a cuboid metal lattice structure 5, an upper annular metal lattice structure 3, and a lower annular metal lattice structure 4, collectively achieves vibration isolation. The presence of the cuboid metal lattice structure 5 allows for flexible adjustment of the dimensions of the proposed three-dimensional vibration isolator based on the available installation space. Specifically, when the installation space is limited, a larger load-bearing capacity can be achieved by increasing the load-bearing area of ​​the upper and lower annular metal lattice structures 3 and 4. However, due to the limited installation space, the height of the upper and lower annular metal lattice structures 3 and 4 is restricted, resulting in limited ability to suppress horizontal interference forces. In this case, the ability to suppress horizontal interference forces can be increased by designing and adjusting the structural parameters of the cuboid metal lattice structure 5, achieving isotropic vibration isolation performance. Compared to a BCC lattice structure of the same material and size, the load-bearing capacity of the proposed BCC-B lattice structure can be increased by more than 30%, and the natural frequency can be reduced by more than 10%. Meanwhile, after coating the BCC cell structure beam 302 and the 1 / 8 sphere unit sphere 301 of the BCC-B lattice structure with high-performance damping polyurea material, the damping ratio can reach more than 0.08.

[0050] When the external vibration is a large impact, the vibration isolator proposed in this invention, while fulfilling the above functions, also has a limiting protection function. Specifically, when the vibration isolator is subjected to a large impact pressure, the upper end cover 1 compresses the upper annular metal lattice structure 3. When it approaches the maximum design deformation of the upper annular metal lattice structure 3, the inner top surface of the upper end cover 1 contacts the upper end surface 205 of the base 2. At this time, the limiting effect is generated by the base 2, protecting the upper annular metal lattice structure 3 from damage. When the vibration isolator is subjected to a large impact tensile force, the upper end cover 1 drives the fastening screw 8 that cooperates with the cylindrical sleeve 102 installed on the upper end cover 1 to move upward. The fastening screw 8 drives the lower end cover 7 to move upward through its nut, thereby generating pressure on the lower annular metal lattice structure 4 by the lower end cover 7. When it approaches the maximum design deformation of the lower annular metal lattice structure 4, the upper end surface 701 of the lower end cover 7 contacts the lower end surface of the limiting ring 9. The limiting effect is generated by the limiting ring 9 fixed on the base 2, protecting the lower annular metal lattice structure 4 from damage; when the vibration isolator is subjected to a large impact pressure from the side, the inner surface 105 of the upper end cover 1 compresses the corresponding cuboid metal lattice structure 5, while the cylindrical sleeve 102 located on the upper end cover 1 compresses the upper annular metal lattice structure 3 and the lower annular metal lattice structure 4. This is achieved by reasonably setting the distance between the side surface 206 of the base 2 and the inner surface 105 of the upper end cover. The size of the cylindrical surface 70201 of the circular groove B702 of the lower end cover 7 and the outer wall of the cylindrical sleeve 102, the outer diameter of the lower end cover 7 and the diameter of the cylindrical cavity below the mounting plate 204 of the base 2, as well as the diameter of the cylindrical cavity enclosed by the mounting plate 204 and the diameter of the cylindrical sleeve 102, ensure that the upper annular metal lattice structure 3, the lower annular metal lattice structure 4 and the four cuboid metal lattice structures 5 will not be damaged by large displacement.

[0051] In summary, this invention solves the problem that existing technologies cannot meet the requirements of lightweight, compact, high load-bearing capacity, impact resistance, radiation resistance, aging resistance, and three-dimensional vibration isolation for vibration isolators in aerospace, shipbuilding, and other fields; at the same time, it improves the stress concentration effect of the BCC lattice structure, which increases the load-bearing capacity of this invention by more than 30%, reduces the natural frequency by more than 10%, and increases the damping ratio to more than 0.08.

Claims

1. A square three-dimensional vibration isolator based on a composite lattice structure, characterized in that: It includes an upper end cap (1), a base (2), an upper annular metal dot matrix structure (3), a lower annular metal dot matrix structure (4), a cuboid metal dot matrix structure (5), a cuboid fixing component (6), a lower end cap (7), fastening screws (8), and a limiting ring (9); the interior of the upper end cap (1) is a cuboid cavity, and a cylindrical sleeve (102) is contained inside the cuboid cavity. The cylindrical sleeve (102) is coaxial with the central axis of the cuboid cavity, and threaded holes (101) of the same size are opened inside the cylindrical sleeve (102) to the upper end face (103) of the upper end cap (1); 4 of the cuboid shapes The metal dot matrix structure (5) is installed in the four mounting slots (203) of the base (2) by the corresponding cuboid fasteners (6). The bottom surface (20301) of the mounting slot (203) is in contact with the bottom surface of the cuboid metal dot matrix structure (5). The upper annular metal dot matrix structure (3) is installed in the circular groove A (202) of the base (2). The thickness of the upper annular metal dot matrix structure (3) is greater than the depth of the circular groove A (202). The bottom surface of the upper annular metal dot matrix structure (3) is in contact with the top surface of the mounting plate (204). The outer diameter of the upper annular metal dot matrix structure (3) is... The diameter of the circular groove A (202) is equal to that of the circular groove A (202); the limiting ring (9) is installed below the mounting plate (204), the upper surface of the limiting ring (9) is fixedly connected to the mounting plate (204), and the outer cylindrical surface of the limiting ring (9) is fixedly connected to the cylindrical cavity side of the mounting plate (204) of the base (2); the lower annular metal lattice structure (4) is installed below the mounting plate (204) of the base (2), the upper end face of the lower annular metal lattice structure (4) is in contact with the lower end face of the mounting plate (204), and the outer cylindrical surface of the lower annular metal lattice structure (4 ... fixedly connected to the cylindrical cavity side of the mounting plate (204) of the base (2); the lower annular metal lattice structure (4) is fixedly connected to the cylindrical cavity side of the mounting plate (204) of the base (2); the lower annular metal lattice structure (4) is fixedly connected to the cylindrical cavity side of the mounting plate (204) of the base (2); the lower annular metal lattice structure (4) is fixedly connected to the cylindrical cavity side of the mounting plate (204) of the base (2); the lower annular metal lattice structure (4) is fixedly connected to the cylindrical cavity side of the mounting plate (204) of the base The inner surfaces are in contact; the thickness of the lower annular metal dot matrix structure (4) is greater than the thickness of the limiting ring (9); the outer diameter of the cylindrical sleeve (102) is equal to the inner diameter of the upper annular metal dot matrix structure (3) and the lower annular metal dot matrix structure (4); a lower end cover (7) is installed below the lower annular metal dot matrix structure (4), and a circular groove B (702) is opened on the lower end cover (7). The upper end face (701) of the lower end cover (7) is in contact with the lower end face of the lower annular metal dot matrix structure (4), and the upper end face of the circular groove B (702) is in contact with the lower end face of the cylindrical sleeve (102).The diameter of the central hole of the mounting plate (204) is larger than the outer diameter of the cylindrical sleeve (102). The cylindrical surface (70201) of the circular groove B (702) has a certain gap with the outer wall of the cylindrical sleeve (102). The outer diameter of the lower end cover (7) is smaller than the diameter of the cylindrical cavity below the mounting plate (204) of the base (2). The diameter of the cylindrical cavity enclosed by the mounting plate (204) is larger than the diameter of the cylindrical sleeve (102). The nut of the fastening screw (8) presses on the lower end surface of the lower end cover (7). The threaded hole (101) of the cylindrical sleeve (102) on the upper end cover (1) cooperates with the fastening screw (8), thereby connecting the upper end cover (1) with the upper annular metal lattice structure (3), the lower annular metal lattice structure (4), and the four cuboid metal lattice structures (5).

2. The square three-dimensional vibration isolator based on a composite lattice structure according to claim 1, characterized in that: The upper annular metal lattice structure (3), the lower annular metal lattice structure (4), and the four rectangular metal lattice structures (5) are all BCC-B lattice structures.

3. The square three-dimensional vibration isolator based on a composite lattice structure according to claim 2, characterized in that: The BCC-B lattice structure includes BCC cell structure beams (302), with 1 / 8 spherical units (301) fixed at both ends of the BCC cell structure beams (302). The 1 / 8 spherical units (301) on the inner ends of the eight BCC cell structure beams (302) are fixed together to form an integral spherical node BCC-B cell structure. The BCC-B cell structure is periodically arrayed to form a BCC-B lattice structure.

4. The square three-dimensional vibration isolator based on a composite lattice structure according to claim 3, characterized in that: The diameter of the BCC cell structure beam (302) is... d Compared with the external dimensions of BCC-B cell structure L The relationship should satisfy The diameter of the solid sphere at the BCC-B cell structure node. b Should meet .

5. The square three-dimensional vibration isolator based on a composite lattice structure according to claim 3, characterized in that: The BCC-B lattice structure BCC cell structure beam (302) and 1 / 8 sphere unit (301) are coated with high-performance damping material (303) on their spherical surfaces.

6. The square three-dimensional vibration isolator based on a composite lattice structure according to claim 2, characterized in that: The material of the BCC-B lattice structure is a 3D-printable metal material, including but not limited to 304 stainless steel, 316L stainless steel and Ti-6Al-4V.

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