Combined three-dimensional quasi-zero stiffness vibration isolation device

Abstract

The present application relates to the technical field of vibration isolation devices, and discloses a combined three-dimensional quasi-zero stiffness vibration isolation device, including a horizontal rolling vibration isolation platform and a plurality of vertical quasi-zero stiffness vibration isolators, wherein the horizontal rolling vibration isolation platform includes at least three non-collinear balls, an upper support plate and a lower support plate, wherein the upper support plate is provided with an upper concave surface having the same number as the balls on one side close to the lower support plate, and the lower support plate is provided with a lower concave surface corresponding to the upper concave surface on one side close to the upper support plate, and the balls are arranged between the upper concave surface and the lower concave surface; the vertical quasi-zero stiffness vibration isolator is arranged on the top of the upper support plate, and the vertical quasi-zero stiffness vibration isolator includes a base, an upper bellows and a lower bellows, wherein the upper bellows and the lower bellows are symmetrically arranged on the upper and lower sides of the base; damping fluid is arranged in both the upper bellows and the lower bellows. The present invention has the beneficial effects of good vibration isolation effect and strong applicability.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration isolation devices, and in particular relates to a combined three-dimensional quasi-zero stiffness vibration isolation device. Background Art

[0002] Vibration isolators are elastic elements that connect equipment and foundations to reduce and eliminate vibration forces transmitted from equipment to foundations and vibrations transmitted from foundations to equipment. Conventional passive vibration isolation devices cannot isolate low-frequency vibrations before the natural frequency due to the existence of natural frequencies, which affects the working accuracy of precision equipment.

[0003] At present, the research hotspot of passive vibration isolation is concentrated in the field of quasi-zero stiffness vibration isolation, that is, adopting reasonable structural design to make the natural frequency of the passive vibration isolation device close to 0, so as to effectively isolate the influence of low-frequency excitation on the working accuracy of precision equipment. However, in actual situations, the disturbance transmitted to the equipment by the ground environment is not in a single direction, but in both horizontal and vertical excitations. Therefore, the existing single-direction quasi-zero stiffness vibration isolation cannot meet the requirements of multi-dimensional vibration isolation.

[0004] Therefore, the existing technology needs to be improved and developed. Summary of the invention

[0005] The purpose of the present application is to provide a combined three-dimensional quasi-zero stiffness vibration isolation device that can simultaneously meet the quasi-zero stiffness requirements in the horizontal and vertical directions and improve the vibration isolation effect.

[0006] The present application provides a combined three-dimensional quasi-zero stiffness vibration isolation device, which includes a horizontal rolling vibration isolation platform and a plurality of vertical quasi-zero stiffness vibration isolators, wherein the horizontal rolling vibration isolation platform includes at least three non-all colinear ball bearings, an upper support plate and a lower support plate, a side of the upper support plate close to the lower support plate is provided with an upper concave surface with the same number as the ball bearings, a side of the lower support plate close to the upper support plate is provided with a lower concave surface corresponding to the upper concave surface one by one, and the ball bearings are arranged between the upper concave surface and the lower concave surface; the vertical quasi-zero stiffness vibration isolator is arranged on the top of the upper support plate.

[0007] The combined three-dimensional quasi-zero stiffness vibration isolation device provided in the present application can provide quasi-zero stiffness requirements in the horizontal and vertical directions by setting a horizontal rolling vibration isolation platform and a plurality of vertical quasi-zero stiffness vibration isolators, and can effectively isolate the influence of low-frequency excitation from the horizontal direction and low-frequency excitation from the vertical direction on the working accuracy of precision equipment, thereby meeting the requirements of multi-dimensional vibration isolation and improving the vibration isolation effect.

[0008] Furthermore, the combined three-dimensional quasi-zero stiffness vibration isolation device provided in the present application, the vertical quasi-zero stiffness vibration isolator includes a base, an upper bellows and a lower bellows, the upper bellows and the lower bellows are symmetrically arranged on the upper and lower sides of the base; damping fluid is arranged in the upper bellows and the lower bellows.

[0009] In practical applications, the upper bellows and the lower bellows are filled with viscous damping fluid. When the upper end surface of the upper bellows is under pressure, the viscous damping fluid squeezes from the upper bellows into the lower bellows, causing pressure loss, thereby dissipating part of the vibration energy.

[0010] Furthermore, in the combined three-dimensional quasi-zero stiffness vibration isolation device provided by the present application, the upper bellows and the lower bellows are connected to each other via a damping hole, and the damping fluid can flow between the upper bellows and the lower bellows through the damping hole.

[0011] Furthermore, in the combined three-dimensional quasi-zero stiffness vibration isolation device provided by the present application, a screw with a damping hole is provided at the center of the base, the upper bellows and the lower bellows are connected through the screw with the damping hole, and the damping fluid can flow between the upper bellows and the lower bellows through the screw with the damping hole.

[0012] In practical applications, the damping can be adjusted by changing the diameter and length of the damping hole by replacing screws with damping holes of different specifications, thereby changing the flow rate of the damping fluid.

[0013] Furthermore, the combined three-dimensional quasi-zero stiffness vibration isolation device provided by the present application, the vertical quasi-zero stiffness vibration isolator also includes an upper disc spring, a lower disc spring, a plurality of stiffness adjustment bolts and a plurality of adjustment nuts, the upper disc spring and the lower disc spring are symmetrically arranged on the upper and lower sides of the base, the upper bellows is arranged between the upper disc spring and the base, and the lower bellows is arranged between the lower disc spring and the base; the stiffness adjustment bolt is arranged between the upper disc spring and the lower disc spring, the adjustment nut is arranged on the side of the upper disc spring away from the lower disc spring, the adjustment nut is sleeved on the stiffness adjustment bolt, and the adjustment nut is used to cooperate with the stiffness adjustment bolt to adjust the axial compression of the upper disc spring and the lower disc spring.

[0014] With this setting, the axial compression of the upper disc spring and the lower disc spring can be adjusted by screwing in the adjustment nut, so as to adjust the stiffness of the vertical quasi-zero stiffness isolator to adapt to different application scenarios and vibration isolation requirements, thereby improving applicability. At the same time, the compression state of the upper and lower bellows can be adjusted by screwing in the adjustment nut to provide positive stiffness, and the axial compression of the upper and lower disc springs can be adjusted to provide negative stiffness, further realizing flexible adjustment of stiffness. In addition, the disc spring-bellows positive and negative stiffness parallel structure is used as the core component of vertical vibration isolation, which has the characteristics of compact size, strong damping dissipation and low natural frequency.

[0015] Furthermore, in the combined three-dimensional quasi-zero stiffness vibration isolation device provided in the present application, a through hole for positioning the stiffness adjustment bolt is provided on the base, the stiffness adjustment bolt passes through the through hole, and the diameter of the through hole is larger than the diameter of the stiffness adjustment bolt.

[0016] Furthermore, in the combined three-dimensional quasi-zero stiffness vibration isolation device provided by the present application, the surfaces of the upper concave surface and the lower concave surface are smooth.

[0017] Furthermore, in the combined three-dimensional quasi-zero stiffness vibration isolation device provided by the present application, the surfaces of the upper concave surface and the lower concave surface are coated with damping material.

[0018] Furthermore, in the combined three-dimensional quasi-zero stiffness vibration isolation device provided by the present application, the number of the balls is three.

[0019] Furthermore, in the combined three-dimensional quasi-zero stiffness vibration isolation device provided by the present application, a damping liquid injection port is provided at the center of the upper disc spring, and the damping liquid injection port is connected to the upper bellows.

[0020] From the above, it can be seen that the combined three-dimensional quasi-zero stiffness vibration isolation device of the present invention can provide quasi-zero stiffness requirements in the horizontal and vertical directions by setting a horizontal rolling vibration isolation platform and a plurality of vertical quasi-zero stiffness vibration isolators, and can effectively isolate the influence of low-frequency excitation from the horizontal direction and low-frequency excitation from the vertical direction on the working accuracy of precision equipment, meet the requirements of multi-dimensional vibration isolation, and improve the vibration isolation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a combined three-dimensional quasi-zero stiffness vibration isolation device provided in this application.

[0022] Figure 2 A partial cross-sectional schematic diagram of a vertical quasi-zero stiffness vibration isolator provided in the present application.

[0023] Figure 3 A cross-sectional view of a vertical quasi-zero stiffness vibration isolator provided in the present application.

[0024] Figure 4 A schematic structural diagram of a lower support plate provided in this application.

[0025] Description of labels:

[0026] 100, horizontal rolling vibration isolation platform; 110, ball bearing; 120, upper support plate; 130, lower support plate; 131, lower concave surface; 200, vertical quasi-zero stiffness isolator; 210, base; 211, screw with damping hole; 212, through hole; 220, upper disc spring; 221, damping liquid injection port; 230, lower disc spring; 240, stiffness adjustment bolt; 250, adjustment nut; 260, upper bellows; 270, lower bellows. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0032] See also Figure 1 and Figure 4 The present invention discloses a combined three-dimensional quasi-zero stiffness vibration isolation device, which includes a horizontal rolling vibration isolation platform 100 and a plurality of vertical quasi-zero stiffness vibration isolators 200. The horizontal rolling vibration isolation platform 100 includes at least three non-collinear balls 110, an upper support plate 120 and a lower support plate 130. A side of the upper support plate 120 close to the lower support plate 130 is provided with an upper concave surface with the same number as the balls 110. A side of the lower support plate 130 close to the upper support plate 120 is provided with a lower concave surface 131 corresponding to the upper concave surface one by one. The balls 110 are arranged between the upper concave surface and the lower concave surface 131. The vertical quasi-zero stiffness vibration isolator 200 is arranged on the top of the upper support plate 120.

[0033] Among them, the contour shapes of the upper concave surface and the lower concave surface 131 can be flexibly designed and replaced according to different ground excitations, and this application does not make specific restrictions here. The middle part of the concave surface fits the surface of the ball 110, and the outer edge of the concave surface plays a buffering and limiting role for the ball 110. Through this setting method, the ball-concave motion pair is used as the core component of horizontal vibration isolation, which has the advantages of large stroke and low natural frequency. Among them, the upper concave surface and the lower concave surface (131) are both curved surfaces (whose curvature changes continuously). When subjected to lateral vibration, lateral relative movement will occur between the upper support plate 120 and the lower support plate 130. Since the upper concave surface and the lower concave surface 131 are both set as curved surfaces, under the action of gravity, the upper support plate 120 will eventually automatically return to the initial position.

[0034] The combined three-dimensional quasi-zero stiffness vibration isolation device provided in the present application can provide quasi-zero stiffness requirements in the horizontal and vertical directions by setting a horizontal rolling vibration isolation platform 100 and a plurality of vertical quasi-zero stiffness vibration isolators 200, and can effectively isolate the influence of low-frequency excitation from the horizontal direction and low-frequency excitation from the vertical direction on the working accuracy of precision equipment, thereby meeting the requirements of multi-dimensional vibration isolation and improving the vibration isolation effect.

[0035] In a further embodiment, the vertical quasi-zero stiffness vibration isolator 200 includes a base 210, an upper bellows 260 and a lower bellows 270, and the upper bellows 260 and the lower bellows 270 are symmetrically arranged on the upper and lower sides of the base 210; damping fluid is arranged in the upper bellows 260 and the lower bellows 270. In practical applications, the upper bellows 260 and the lower bellows 270 are filled with viscous damping fluid (which can be water, oil or other liquids). When the upper end surface of the upper bellows 260 is pressurized, the viscous damping fluid squeezes from the upper bellows 260 into the lower bellows 270, generating pressure loss, thereby dissipating part of the vibration energy and providing a certain amount of fluid damping.

[0036] In some embodiments, the upper bellows 260 and the lower bellows 270 are connected to each other through a damping hole, and the damping fluid can flow between the upper bellows 260 and the lower bellows 270 through the damping hole. With this arrangement, the flow stroke of the damping fluid can be increased, resulting in greater energy loss and providing greater fluid damping.

[0037] The damping hole may be directly opened on the base 210 .

[0038] In other preferred embodiments, a screw 211 with a damping hole is provided at the center of the base 210, and the upper bellows 260 and the lower bellows 270 are connected through the screw 211 with the damping hole, and the damping fluid can flow between the upper bellows 260 and the lower bellows 270 through the screw 211 with the damping hole. In practical applications, since the upper bellows 260 and the lower bellows 270 are filled with viscous damping fluid, when the upper end surface of the upper bellows 260 is compressed, the upper bellows 260 is compressed and the lower bellows 270 is stretched, thereby squeezing the damping fluid to flow through the screw 211 with the damping hole, generating energy loss and providing a certain amount of fluid damping. In addition, by replacing the screws 211 with damping holes of different specifications, the diameter and length of the damping hole can be changed, thereby changing the flow rate of the damping fluid, achieving damping adjustment, and improving applicability.

[0039] In practical applications, commonly used negative stiffness mechanisms include inclined springs, butterfly springs (disc springs for short), diaphragm springs, Euler pressure rods, electromagnetic negative stiffness, etc. The disc spring has the advantages of small structure and large load-bearing capacity. When the ratio of the disc spring height to the disc spring thickness is greater than the square root of two and is compressed to a certain value, it exhibits the properties of negative stiffness.

[0040] See also Figure 2-Figure 3In some preferred embodiments, the vertical quasi-zero stiffness isolator 200 also includes an upper disc spring 220, a lower disc spring 230, a plurality of stiffness adjustment bolts 240 and a plurality of adjustment nuts 250. The upper disc spring 220 and the lower disc spring 230 are symmetrically arranged on the upper and lower sides of the base 210. The upper bellows 260 is arranged between the upper disc spring 220 and the base 210, and the lower bellows 270 is arranged between the lower disc spring 230 and the base 210. The stiffness adjustment bolt 240 is arranged between the upper disc spring 220 and the lower disc spring 230, and the adjustment nut 250 is arranged on the side of the upper disc spring 220 away from the lower disc spring 230. The adjustment nut 250 is sleeved on the stiffness adjustment bolt 240, and the adjustment nut 250 is used to cooperate with the stiffness adjustment bolt 240 to adjust the axial compression of the upper disc spring 220 and the lower disc spring 230. Among them, one end of the stiffness adjustment bolt 240 is connected to the lower connection part of the lower disc spring 230, and the other end of the stiffness adjustment bolt 240 passes through the upper connection part of the upper disc spring 220, and the end is exposed outside the upper disc spring 220, and the adjustment nut 250 is sleeved on the exposed end of the stiffness adjustment bolt 240. Through this setting, the axial compression of the upper disc spring 220 and the lower disc spring 230 can be adjusted by screwing the adjustment nut 250, so as to adjust the stiffness of the vertical quasi-zero stiffness isolator 200 to adapt to different application scenarios and vibration isolation requirements, thereby improving applicability. In addition, among them, the upper connection part of the upper disc spring 220 is connected to the top of the upper bellows 260, and the lower connection part of the lower disc spring 230 is connected to the bottom of the lower bellows 270. Through this setting, when the adjustment nut 250 is screwed, the upper bellows 260 and the lower bellows 270 will also be compressed or extended. In practical applications, although the stiffness between the upper bellows 260 and the lower bellows 270 is relatively small, there is still positive stiffness. The axial compression of the upper disc spring 220 and the lower disc spring 230 can be adjusted by screwing the adjustment nut 250 so that the upper disc spring 220 and the lower disc spring 230 reach negative stiffness. The positive stiffness between the upper bellows 260 and the lower bellows 270 and the negative stiffness of the upper disc spring 220 and the lower disc spring 230 offset each other, making the stiffness of the vertical quasi-zero stiffness isolator 200 close to zero, which can effectively isolate low-frequency vibrations. In addition, the disc spring-bellows positive and negative stiffness parallel structure is used as the core component of vertical vibration isolation, which has the characteristics of compact size, strong damping dissipation and low natural frequency.

[0041] in, Figure 2 The two relative arrows in the middle indicate the compression direction of the upper disc spring 220 and the lower disc spring 230 , and the arrow close to the adjusting nut 250 indicates tightening or loosening the adjusting nut 250 .

[0042] In a further embodiment, the stiffness adjustment bolts 240 are generally set to three, and the three stiffness adjustment bolts 240 are rotationally symmetrically distributed around the center of the upper disc spring 220. Through this arrangement, the upper connecting part of the upper disc spring 220 and the lower connecting part of the lower disc spring 230 can be kept flat during adjustment, so that the axial compression of the upper disc spring 220 and the lower disc spring 230 is more accurate, thereby improving the adjustment accuracy.

[0043] In a further embodiment, a through hole 212 for positioning a stiffness adjustment bolt 240 is provided on the base 210, and the stiffness adjustment bolt 240 passes through the through hole 212, and the diameter of the through hole 212 is larger than the diameter of the stiffness adjustment bolt 240. This arrangement can prevent friction between the stiffness adjustment bolt 240 and the through hole 212 from affecting the vibration isolation effect when the vibration isolation device moves up and down.

[0044] In a further embodiment, the upper concave surface and the lower concave surface 131 have smooth surfaces. With this arrangement, the vibration isolation frequency can be reduced.

[0045] In some preferred embodiments, the surfaces of the upper concave surface and the lower concave surface 131 are coated with damping materials. In practical applications, the damping materials can be selected from existing rubber damping, asphalt damping, plastic damping, resin damping, composite damping, intelligent damping piezorheological damping, magnetorheological fluid damping, and high damping alloys. Through this arrangement, the friction between the ball 110 and the concave surface can be increased, thereby increasing the damping of the horizontal movement of the ball 110 and improving the vibration isolation effect.

[0046] In some preferred embodiments, there are three balls 110. In practical applications, the balls 110 and the concave profile can form a three-point support structure, which has the characteristics of large vertical rigidity and small horizontal rigidity.

[0047] In some embodiments, a damping liquid injection port 221 is provided at the center of the upper disc spring 220, and the damping liquid injection port 221 is connected to the upper bellows 260. In practical applications, the viscous damping liquid can be poured into the bellows container formed by the upper bellows 260 and the lower bellows 270 through the damping liquid injection port 221, and the damping liquid injection port 221 is also provided with a flange end cover, which can close the damping liquid injection port 221. Through this arrangement, the amount of damping liquid can be adjusted as needed.

[0048] Therefore, the combined three-dimensional quasi-zero stiffness vibration isolation device of the present application has the following advantages:

[0049] 1. With respect to the design of the vertical quasi-zero stiffness vibration isolator 200, a stiffness adjustable function is achieved by adopting a vertically symmetrical configuration to adjust the preload of the disc spring.

[0050] 2. The introduction of the bellows container increases the damping and energy dissipation effect of the vibration isolation structure, solves the problem of insufficient damping of conventional metal vibration isolators, and can effectively suppress the vibration amplitude at the resonance point.

[0051] 3. For the horizontal rolling vibration isolation platform 100, by setting damping material on the surface of the concave surface, the friction between the ball 110 and the concave surface is increased, thereby increasing the damping of the horizontal movement of the ball 110 and improving the vibration isolation effect.

[0052] In summary, the combined three-dimensional quasi-zero stiffness vibration isolation device, by setting a horizontal rolling vibration isolation platform 100 and a plurality of vertical quasi-zero stiffness vibration isolators 200, can provide quasi-zero stiffness requirements in the horizontal and vertical directions, and can effectively isolate the influence of low-frequency excitation from the horizontal direction and low-frequency excitation from the vertical direction on the working accuracy of precision equipment, meet the requirements of multi-dimensional vibration isolation, and improve the vibration isolation effect.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0054] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A combined three-dimensional quasi-zero stiffness vibration isolation device, characterized in that: The invention comprises a horizontal rolling vibration isolation platform (100) and a plurality of vertical quasi-zero stiffness vibration isolators (200), wherein the horizontal rolling vibration isolation platform (100) comprises at least three non-collinear balls (110), an upper support plate (120) and a lower support plate (130), wherein a surface of the upper support plate (120) close to the lower support plate (130) is provided with an upper concave surface having the same number as the balls (110), and a surface of the lower support plate (130) close to the upper support plate (120) is provided with a lower concave surface (131) corresponding to the upper concave surface one by one, and the balls (110) are arranged between the upper concave surface and the lower concave surface (131); and the vertical quasi-zero stiffness vibration isolator (200) is arranged on the top of the upper support plate (120); The vertical quasi-zero stiffness vibration isolator (200) comprises a base (210), an upper bellows (260) and a lower bellows (270); the upper bellows (260) and the lower bellows (270) are symmetrically arranged on upper and lower sides of the base (210); damping fluid is arranged in both the upper bellows (260) and the lower bellows (270); The upper bellows (260) and the lower bellows (270) are connected to each other via a damping hole, and the damping fluid can flow between the upper bellows (260) and the lower bellows (270) through the damping hole; A screw (211) with a damping hole is provided at the center of the base (210); the upper bellows (260) and the lower bellows (270) are connected via the screw (211) with the damping hole; and damping fluid can flow between the upper bellows (260) and the lower bellows (270) via the screw (211) with the damping hole; The vertical quasi-zero stiffness vibration isolator (200) further comprises an upper disc spring (220), a lower disc spring (230), a plurality of stiffness adjustment bolts (240) and a plurality of adjustment nuts (250), wherein the upper disc spring (220) and the lower disc spring (230) are symmetrically arranged on the upper and lower sides of the base (210), the upper bellows (260) is arranged between the upper disc spring (220) and the base (210), and the lower bellows (270) is arranged between the lower disc spring (230) and the base (210). 10); the stiffness adjustment bolt (240) is arranged between the upper disc spring (220) and the lower disc spring (230); the adjustment nut (250) is arranged on a side of the upper disc spring (220) away from the lower disc spring (230); the adjustment nut (250) is sleeved on the stiffness adjustment bolt (240); the adjustment nut (250) is used to cooperate with the stiffness adjustment bolt (240) to adjust the axial compression of the upper disc spring (220) and the lower disc spring (230).

2. The combined three-dimensional quasi-zero stiffness vibration isolation device according to claim 1 is characterized in that: The base (210) is provided with a through hole (212) for positioning the stiffness adjustment bolt (240); the stiffness adjustment bolt (240) passes through the through hole (212); and the diameter of the through hole (212) is greater than the diameter of the stiffness adjustment bolt (240).

3. The combined three-dimensional quasi-zero stiffness vibration isolation device according to claim 1 is characterized in that: The upper concave surface and the lower concave surface (131) have smooth surfaces.

4. The combined three-dimensional quasi-zero stiffness vibration isolation device according to claim 1 is characterized in that: The surfaces of the upper concave surface and the lower concave surface (131) are coated with damping material.

5. The combined three-dimensional quasi-zero stiffness vibration isolation device according to claim 1 is characterized in that: The number of the balls (110) is three.

6. The combined three-dimensional quasi-zero stiffness vibration isolation device according to claim 1 is characterized in that: A damping liquid injection port (221) is provided at the center of the upper disc spring (220), and the damping liquid injection port (221) is in communication with the upper bellows (260).

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