Large-negative-stiffness magnetic spring device for heavy-load low-frequency vibration suppression

Abstract

The invention relates to a large-negative-stiffness magnetic spring device for heavy-load low-frequency vibration suppression. The large-negative-stiffness magnetic spring device comprises an inner magnetic ring pile structure and an outer magnetic ring pile. The inner magnetic ring pile structure can reciprocate in the hollow part of the outer magnetic ring pile; the inner magnetic ring pile structure comprises an upper magnetic ring pile and a lower magnetic ring pile; the upper magnetic ring pile and the lower magnetic ring pile respectively comprise a plurality of inner magnetic rings which are coaxially arranged; the outer magnetic ring pile comprises a plurality of outer magnetic rings which are coaxially arranged; in the axial direction of the inner magnetic ring pile structure, the inner magnetic ring pile structure is provided with a first symmetry plane, and the magnetization directions of the inner magnetic rings of the upper magnetic ring pile and the lower magnetic ring pile are symmetrical about the first symmetry plane; in the axial direction of the outer magnetic ring pile, the outer magnetic ring pile is provided with a second symmetry plane, and the magnetization direction of outer magnetic rings in the outer magnetic ring pile is symmetrical about the second symmetry plane; when the first symmetry plane and the second symmetry plane coincide, the resultant magnetic force between the inner magnetic ring pile structure and the outer magnetic ring pile structure is zero, and the maximum negative stiffness is generated. According to the scheme, the low-frequency vibration is effectively suppressed.

Description

Technical Field

[0001] The present invention relates to the field of vibration control, and particularly to a large negative stiffness magnetic spring device for suppressing heavy-load low-frequency vibration. Background Art

[0002] During vehicle driving, the unevenness of the road surface inevitably inputs external excitation to the vehicle wheels and conducts it to the entire vehicle body to generate vibration. Such vibration not only increases additional energy consumption and causes damage to mechanical components, but also greatly affects comfort, driving feel, etc. In order to attenuate the vehicle body vibration and tire deformation caused by road unevenness, it is required that the vehicle has good vibration isolation characteristics for road unevenness. The main function of the vehicle suspension is to achieve the vibration damping function. It is one of the key components inside the vehicle structure and also bears the role of supporting the vehicle body. Its performance will directly affect the ride comfort, handling stability and safety of the vehicle. Currently, the commonly used vehicle suspension structure often uses viscous liquid or dry friction damper to convert the vibration energy into heat and dissipate it. Its vibration isolation mechanism is often linear.

[0003] According to the linear vibration isolation mechanism, the starting frequency of linear vibration isolation is about , where is the natural frequency of the suspension linear vibration isolation system and ( is the equivalent stiffness of the suspension, is the equivalent mass of the vehicle body). That is to say, only the vibration source with a frequency greater than can be well suppressed by the linear vibration isolator, while the vibration with a frequency lower than is difficult to be suppressed. For the vehicle suspension, value is fixed. In order to reduce the starting frequency of vibration isolation, the only way is to reduce the equivalent stiffness , but the smaller it is, the smaller the load-bearing capacity of the suspension and the worse the stability. Therefore, value cannot be too small. Thus, it can be seen that the current low-frequency vibration isolation performance of the vehicle suspension is poor. For the vehicle suspension, the vibration frequency generated by the road surface just concentrates in the low-frequency band, generally a few hertz, and it is urgent to design a non-linear vehicle suspension that can suppress low-frequency vibration.

[0004] Quasi-zero stiffness is a novel non-linear stiffness, which has a unique high static and low dynamic stiffness characteristic, that is, the stiffness is large at static time and very small at dynamic time, so as to effectively overcome the contradiction between high load-bearing capacity and low natural frequency. In engineering applications, quasi-zero stiffness often consists of a positive stiffness ( ) spring and a negative stiffness ( ) spring in parallel combination, where the static load-bearing capacity depends on the linear positive stiffness It can be seen that, in order to utilize the quasi-zero stiffness to solve the problem of low-frequency vibration of heavy loads in vehicle suspensions, the difficulty lies in designing a spring structure with a large negative stiffness and a relatively wide displacement range of the large negative stiffness. To address the above problems, the present invention discloses a large negative stiffness magnetic spring device for suppressing low-frequency vibration of vehicle suspensions. Summary of the Invention

[0005] The object of the present invention is to provide a large negative stiffness magnetic spring device for suppressing low-frequency vibration of heavy loads.

[0006] To achieve the above object of the invention, the present invention provides a large negative stiffness magnetic spring device for suppressing low-frequency vibration of heavy loads, comprising: an inner magnetic ring stack structure and an outer magnetic ring stack arranged coaxially; The inner magnetic ring stack structure is movably arranged, and the outer magnetic ring stack is fixedly arranged; Along the axial direction of the outer magnetic ring stack, the inner magnetic ring stack structure can reciprocally move in the hollow part of the outer magnetic ring stack; The inner magnetic ring stack structure includes an upper magnetic ring stack and a lower magnetic ring stack that are symmetrically and spaced apart; The upper magnetic ring stack and the lower magnetic ring stack each include a plurality of coaxially arranged inner magnetic rings; The outer magnetic ring stack includes a plurality of coaxially arranged outer magnetic rings; Along the axial direction of the inner magnetic ring stack structure, the inner magnetic ring stack structure has a first symmetry plane, wherein the magnetization directions of the inner magnetic rings of the upper magnetic ring stack and the lower magnetic ring stack are symmetric with respect to the first symmetry plane; Along the axial direction of the outer magnetic ring stack, the outer magnetic ring stack has a second symmetry plane, wherein the magnetization directions of the outer magnetic rings in the outer magnetic ring stack are symmetric with respect to the second symmetry plane; When the first symmetry plane coincides with the second symmetry plane, the resultant magnetic force between the inner magnetic ring stack structure and the outer magnetic ring stack is 0, and the maximum negative stiffness is generated.

[0007] According to one aspect of the present invention, all of the inner magnetic rings and the outer magnetic rings have the same axial thickness.

[0008] According to one aspect of the present invention, the magnetization directions of all the inner magnetic rings in the inner magnetic ring stack structure change counterclockwise by 90° from top to bottom; The magnetization directions of all the outer magnetic rings in the outer magnetic ring stack change clockwise by 90° from top to bottom.

[0009] According to one aspect of the present invention, the number of inner magnetic rings in the upper magnetic ring stack and the lower magnetic ring stack is respectively odd; The number of outer magnetic rings in the outer magnetic ring stack is odd; The number of outer magnetic rings in the outer magnetic ring stack is greater than the number of inner magnetic rings in the inner magnetic ring stack structure.

[0010] According to one aspect of the present invention, along the axial direction of the inner magnetic ring stack structure, the upper magnetic ring stack has an upper secondary symmetry plane, and the lower magnetic ring stack has a lower secondary symmetry plane; In the upper magnetic ring stack, the magnetization direction of the upper intermediate inner magnetic ring corresponding to the upper secondary symmetry plane is arranged along the axial direction; In the lower magnetic ring stack, the magnetization direction of the lower intermediate inner magnetic ring corresponding to the lower secondary symmetry plane is arranged along the axial direction; In the outer magnetic ring stack, the magnetization direction of the intermediate outer magnetic ring corresponding to the second symmetry plane is arranged along the radial direction.

[0011] According to one aspect of the present invention, the magnetization direction of the upper intermediate inner magnetic ring corresponding to the upper secondary symmetry plane is arranged in the upward direction along the axial direction; The magnetization direction of the lower intermediate inner magnetic ring corresponding to the lower secondary symmetry plane is arranged in the downward direction along the axial direction; The magnetization direction of the intermediate outer magnetic ring corresponding to the second symmetry plane is arranged in the radially outward direction.

[0012] According to one aspect of the present invention, it further includes: a push rod, an annular spacer, a linear spring, and a sealed housing; The push rod is fixedly connected coaxially with the inner magnetic ring stack structure; The outer magnetic ring stack is supported coaxially on the upper side of the annular spacer by the annular spacer; An upper connecting member is provided at the upper end of the push rod; A lower connecting member is provided at one end of the annular spacer away from the outer magnetic ring stack; The two opposite ends of the linear spring are respectively connected to the push rod and the annular spacer; The sealed housing encloses the inner magnetic ring stack structure and the outer magnetic ring stack therein; A sliding through hole for the push rod to extend and be slidably connected is provided at the upper end of the sealed housing, and the lower end of the sealed housing is connected to the annular spacer.

[0013] According to one aspect of the present invention, the linear spring is located in the hollow part surrounded by the outer magnetic ring stack and the annular spacer; The upper end of the linear spring is fixedly connected to the lower end of the push rod, and the lower end of the linear spring is fixedly connected to the annular spacer.

[0014] According to one aspect of the present invention, the linear spring is arranged outside the sealed housing; The upper end of the linear spring is fixedly connected to the upper end of the push rod extending out of the sealed housing, and the lower end of the linear spring is fixedly connected to the annular spacer.

[0015] According to one aspect of the present invention, the annular cushion block is a circular ring structure, and the outer diameter of the annular cushion block is greater than or equal to the outer diameter of the outer magnetic ring stack.

[0016] According to one solution of the present invention, the present invention has the following advantages: 1. The present invention can achieve non-contact vibration reduction, which can fully eliminate the wear caused by physical contact, making it have a better service life and reliability; 2. The radial resultant force of the present invention is zero, having better stability, making its working process more reliable; 3. The present invention can generate a large negative stiffness in a compact space, enabling it to be further integrated with other structures to greatly improve the flexibility of use of the present invention.

[0017] According to one solution of the present invention, the large negative stiffness magnetic spring device of the present invention can be further connected in parallel with a large positive stiffness helical spring, and thus can be conveniently used for the quasi-zero stiffness required for low-frequency vibration isolation of vehicle suspensions.

[0018] According to one solution of the present invention, the present invention has the advantage of a compact structure, enabling it to achieve a large load-bearing capacity in a compact space.

[0019] According to one solution of the present invention, when the first symmetry plane and the second symmetry plane coincide in the present invention, the negative stiffness amplitudes between the upper magnetic ring stack, the lower magnetic ring stack and the outer magnetic ring stack reach the maximum simultaneously, doubling the negative stiffness amplitude between the inner magnetic ring stack structure and the outer magnetic ring stack, thereby achieving a large negative stiffness in a small volume. Description of the Drawings

[0020] Figure 1 Structural diagram of the inner magnetic ring stack and the outer magnetic ring stack in the large negative stiffness magnetic spring device according to an embodiment of the present invention; Figure 2 Three-dimensional structural diagram of the inner magnetic ring / outer magnetic ring according to an embodiment of the present invention; Figure 3 Structural diagram of the large negative stiffness magnetic spring device according to an embodiment of the present invention; Figure 4 Structural diagram of the large negative stiffness magnetic spring device according to another embodiment of the present invention; Figure 5 Connection structural diagram of the ejector rod with the upper fixing structure and the lower fixing structure according to an embodiment of the present invention; Figure 6 Connection structural diagram of the ejector rod with the upper fixing structure, the lower fixing structure, the spring connecting piece and the movable guiding piece according to an embodiment of the present invention; Figure 7 Combined structural diagram of the upper fixing structure and the upper magnetic ring stack according to an embodiment of the present invention; Figure 8Combined structure diagram of the lower fixing structure and the lower magnetic ring stack of an embodiment of the present invention; Figure 9 Structure diagram of the balance support member of an embodiment of the present invention. Specific embodiments

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0022] When describing the embodiments of the present invention, the orientation or positional relationship expressed by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" is based on the orientation or positional relationship shown in the relevant drawings. It is 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. Therefore, the above terms should not be construed as limiting the present invention.

[0023] The present invention will be described in detail below in conjunction with the drawings and specific embodiments. The embodiments cannot be elaborated here one by one, but the embodiments of the present invention are not limited to the following embodiments.

[0024] Combined with Figure 1 and Figure 2As shown, according to an embodiment of the present invention, a large negative stiffness magnetic spring device for suppressing heavy load low-frequency vibration of the present invention includes: an inner magnetic ring stack structure 1 and an outer magnetic ring stack 2 arranged coaxially; wherein, the inner magnetic ring stack structure 1 is movably arranged, and the outer magnetic ring stack 2 is fixedly arranged. Specifically, the inner magnetic ring stack structure 1 is used to be connected to the movable structure of the vehicle, while the outer magnetic ring stack 2 is connected to the main body structure of the vehicle. In this embodiment, along the axial direction of the outer magnetic ring stack 2, the inner magnetic ring stack structure 1 can reciprocate in the hollow part of the outer magnetic ring stack 2; wherein, the inner magnetic ring stack structure 1 includes an upper magnetic ring stack 1a and a lower magnetic ring stack 1b that are symmetrically and spaced apart; and the upper magnetic ring stack 1a and the lower magnetic ring stack 1b respectively include a plurality of coaxially arranged inner magnetic rings; wherein, since the upper magnetic ring stack 1a and the lower magnetic ring stack 1b are symmetrically distributed, thus, the number of inner magnetic rings arranged in the upper magnetic ring stack 1a is the same as the number of inner magnetic rings arranged in the lower magnetic ring stack 1b, so as to ensure the symmetry of the entire inner magnetic ring stack structure 1. Further, the outer magnetic ring stack 2 includes a plurality of coaxially arranged outer magnetic rings; in this embodiment, along the axial direction of the inner magnetic ring stack structure 1, the inner magnetic ring stack structure 1 has a first symmetry plane, wherein, the magnetization directions of the inner magnetic rings of the upper magnetic ring stack 1a and the lower magnetic ring stack 1b are symmetric about the first symmetry plane; further, along the axial direction of the outer magnetic ring stack 2, the outer magnetic ring stack 2 has a second symmetry plane, wherein, the magnetization directions of the outer magnetic rings in the outer magnetic ring stack 2 are symmetric about the second symmetry plane; in this embodiment, according to the symmetry of the magnetization directions and structures of the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2, when the first symmetry plane coincides with the second symmetry plane (i.e., the movement displacement ), the resultant magnetic force between the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2 is 0. Therefore, the position of the second symmetry plane of the fixed outer magnetic ring stack 2 is the force balance position of the large negative stiffness magnetic spring device of this solution, that is, there is . Correspondingly, the range of the offset distance between the first symmetry plane and the second symmetry plane is the movement displacement of the inner magnetic ring stack structure 1 relative to the outer magnetic ring stack 2. Among them, due to the circumferential symmetry of the inner and outer magnetic ring stacks, the radial resultant magnetic force between the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2 is 0, and there is only an axial magnetic force, and the magnitude of the axial magnetic force is related to the movement displacement of the inner magnetic ring stack structure 1, denoted as ; wherein, when the distance between the upper sub-symmetry plane of the upper magnetic ring stack 1a or the lower sub-symmetry plane of the lower magnetic ring stack 1b and the second symmetry plane of the outer magnetic ring stack 2 is H , that is, the first symmetry plane coincides with the second symmetry plane. At this time, the negative stiffness amplitude between the magnetic ring stack structure 1 and the outer magnetic ring stack 2 reaches the maximum.

[0025] In this embodiment, the large negative stiffness magnetic spring device of the present invention generates the maximum negative stiffness at the equilibrium position. Among them, the stiffness calculation formula of the large negative stiffness magnetic spring device of the present invention is , from which it can be seen that it has the largest negative stiffness near the equilibrium point.

[0026] Combined with Figure 1 and Figure 2 As shown, according to an embodiment of the present invention, all the inner magnetic rings and outer magnetic rings have the same axial thickness.

[0027] Through the above settings, the inner magnetic rings and outer magnetic rings having the same axial thickness make the magnetic pole distribution of the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2 more accurately maintain their symmetry, making the arrangement of the magnetization direction easier to accurately maintain, effectively reducing the risk of lateral torque or radial offset caused by the asymmetric magnetic field, and improving the stability of the axial stiffness of the present invention.

[0028] In addition, the inner magnetic rings and outer magnetic rings having the same axial thickness make the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2 have excellent negative stiffness characteristics, and, facilitate the simplification of the manufacturing process of the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2, uniformize the stress distribution, and make the structure more compact, comprehensively improving the amplitude of the negative stiffness and the reliability and economy of the structure.

[0029] As Figure 1 shown, according to an embodiment of the present invention, the magnetization directions of all the inner magnetic rings in the inner magnetic ring stack structure 1 change counterclockwise by 90° from top to bottom; correspondingly, the magnetization directions of all the outer magnetic rings in the outer magnetic ring stack 2 change clockwise by 90° from top to bottom.

[0030] Through the above settings, the present solution creatively optimizes the distribution of the magnetization directions in the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2 in the present solution, making it easier to ensure the use performance of the present solution, enabling it to fully generate the largest negative stiffness at the position where the magnetic force resultant is 0, and making it easier to match the corresponding compression spring with a large positive stiffness, thereby improving the low-frequency vibration isolation performance of the automotive suspension.

[0031] As Figure 1As shown, according to an embodiment of the present invention, the number of inner magnetic rings in the upper magnetic ring stack 1a is odd, and the number of inner magnetic rings in the lower magnetic ring stack 1b is odd; the number of outer magnetic rings in the outer magnetic ring stack 2 is odd. In this embodiment, the number of inner magnetic rings included in the upper magnetic ring stack 1a is at least three. For example, there are three inner magnetic rings in the upper magnetic ring stack 1a. The number of inner magnetic rings included in the lower magnetic ring stack 1b is at least three. For example, there are three inner magnetic rings in the lower magnetic ring stack 1b. Correspondingly, the number of outer magnetic rings included in the outer magnetic ring stack 2 is at least three. For example, the number of outer magnetic rings in the outer magnetic ring stack 2 is set to three, five, etc. In this embodiment, the number of outer magnetic rings in the outer magnetic ring stack 2 is greater than the number of inner magnetic rings in the inner magnetic ring stack structure 1. Through the above settings, it is ensured that the outer magnetic ring stack 2 installed on the fixed structure in the large negative stiffness magnetic spring device of the present invention has sufficient supporting capacity, so as to fully ensure that the present solution can flexibly achieve the flexible adjustment of negative stiffness under the requirement of small volume, greatly improving the flexibility and applicability of the present invention.

[0032] In this embodiment, along the axial direction of the inner magnetic ring stack structure 1, the upper magnetic ring stack 1a has an upper sub-symmetry plane. Among them, in the upper magnetic ring stack 1a, the upper sub-symmetry plane is in the symmetric position of the upper middle inner magnetic ring. Thus, the upper magnetic ring stack 1a realizes the symmetry of the structure at the position of the upper sub-symmetry plane. Correspondingly, the lower magnetic ring stack 1b has a lower sub-symmetry plane; thus, the lower magnetic ring stack 1b realizes the symmetry of the structure at the position of the lower sub-symmetry plane.

[0033] As Figure 1 shown, according to an embodiment of the present invention, the magnetization directions of all the inner magnetic rings in the inner magnetic ring stack structure 1 change counterclockwise by 90° from top to bottom; the magnetization directions of all the outer magnetic rings in the outer magnetic ring stack 2 change clockwise by 90° from top to bottom.

[0034] Furthermore, in the upper magnetic ring stack 1a, the magnetization direction of the upper middle inner magnetic ring corresponding to the upper sub-symmetry plane is set along the axial direction; in the lower magnetic ring stack 1b, the magnetization direction of the lower middle inner magnetic ring corresponding to the lower sub-symmetry plane is set along the axial direction; in the outer magnetic ring stack 2, the magnetization direction of the middle outer magnetic ring corresponding to the second symmetry plane is set along the radial direction. Thus, it is ensured that the magnetization directions of the inner magnetic rings and the outer magnetic rings arranged at the symmetry plane positions are perpendicular to each other.

[0035] In this embodiment, taking the example that 3 inner magnetic rings are arranged in the upper magnetic ring stack 1a, 3 inner magnetic rings are arranged in the lower magnetic ring stack 1b, and 5 outer magnetic rings are arranged in the outer magnetic ring stack 2; among them, the magnetization directions of the 5 layers of outer magnetic rings in the outer magnetic ring stack 2 from top to bottom are radially inward, vertically upward, radially outward, vertically downward, and radially inward in sequence; the magnetization directions of the 3 layers of inner magnetic rings in the upper magnetic ring stack 1a from top to bottom are radially outward, vertically upward, and radially inward in sequence; the magnetization directions of the 3 layers of inner magnetic rings in the lower magnetic ring stack 1b from top to bottom are radially inward, vertically downward, and radially outward in sequence; through this arrangement, the inner magnetic field of the outer magnetic ring stack 2 is enhanced, while the outer magnetic field is weakened; at the same time, the outer magnetic field of the inner magnetic ring stack structure 1 is enhanced, while the inner magnetic field is weakened, thereby greatly enhancing the magnetic force between the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2. At the same time, the upper magnetic ring stack 1a and the lower magnetic ring stack 1b achieve duality on both sides of the first symmetry plane, so that the upper magnetic ring stack 1a and the lower magnetic ring stack 1b generate the same stiffness as the outer magnetic ring stack 2, thereby doubling the negative stiffness of the structure at the equilibrium position and achieving a large negative stiffness in a compact space.

[0036] In addition, when the distance between the upper sub-symmetry plane and the second symmetry plane is H the upper magnetic ring stack 1a and the outer magnetic ring stack 2 generate the maximum negative stiffness, and have a large negative stiffness at positions near H above and below; when the distance between the lower sub-symmetry plane and the second symmetry plane is H the lower magnetic ring stack 1b and the outer magnetic ring stack 2 generate the maximum negative stiffness, and have a large negative stiffness at positions near H above and below.

[0037] Combined with Figure 1 and Figure 3 shown, according to an embodiment of the present invention, the large negative stiffness magnetic spring device of the present invention further includes: a push rod 3, an annular cushion block 4, a linear spring 5 and a sealing housing 6; wherein, the push rod 3 is fixedly connected coaxially with the inner magnetic ring stack structure 1; specifically, the inner magnetic ring stack structure 1 can be sleeved on the push rod 3 to achieve fixed connection with the push rod 3.

[0038] In this embodiment, the outer magnetic ring stack 2 is supported coaxially with the annular cushion block 4 on the upper side of the annular cushion block 4; among them, the outer magnetic ring stack 2 can be fixed on the upper side of the annular cushion block 4 by means of threaded connection or bonding to achieve reliable installation.

[0039] In this embodiment, an upper connector 31 is provided at one end of the ejector rod 3 away from the inner magnetic ring stack structure 1; among them, the upper connector 31 is installed on the ejector rod 3 by means of welding, threaded connection, etc.; further, a lower connector 41 is provided at one end of the annular spacer 4 away from the outer magnetic ring stack 2; among them, a support plate for connecting the lower connector 41 can be provided on the annular spacer 4, and thus, fixation can be achieved by means of welding, threaded connection, etc. between the lower connector 41 and the support plate.

[0040] In this embodiment, opposite ends of the linear spring 5 are respectively connected to the ejector rod 3 and the annular spacer 4; thus, the provided linear spring 5 provides positive stiffness to the large negative stiffness magnetic spring device, so as to achieve a combination of positive and negative stiffness to achieve a better vibration damping effect.

[0041] In this embodiment, the sealing housing 6 is integrally in a hollow cylindrical structure, and thus, the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2 can be surrounded therein; among them, a sliding through hole for the ejector rod 3 to extend out and be slidably connected is provided at the upper end of the sealing housing 6, and the lower end of the sealing housing 6 is connected to the annular spacer 4. In this embodiment, a sealing ring made of wear-resistant material can be provided between the ejector rod 3 and the sliding through hole at the upper end of the sealing housing 6, which is more beneficial to maintaining the cleanliness inside during long-term operation to ensure its long-term stable and reliable operation. In this embodiment, the cross-sectional shape of the ejector rod 3 can be set to be circular, prismatic, elliptical, etc., especially by setting it to be non-circular, so as to fully suppress its circumferential rotation to ensure the reliable and stable operation thereof. Of course, the corresponding anti-rotation effect can also be achieved by setting a tangent plane on its side surface, which will not be elaborated here.

[0042] In this embodiment, a circular baffle can be further provided at one end of the ejector rod 3 where the upper connector 31 is connected, and thus, the area of the upper end of the ejector rod 3 can be fully increased, so as to effectively achieve the shielding of the lower part, which is more beneficial to avoiding the accumulation of dust with an outer diameter, etc. at the sliding position, and effectively improves the operation stability of the present invention.

[0043] As Figure 3 shown, according to an embodiment of the present invention, the linear spring 5 is located in the hollow part surrounded by the outer magnetic ring stack 2 and the annular spacer 4; among them, the upper end of the linear spring 5 is fixedly connected to the lower end of the ejector rod 3, and the lower end of the linear spring 5 is fixedly connected to the annular spacer 4. Thus, the corresponding elastic support effect can be achieved during the operation of the inner magnetic ring stack structure 1 relative to the outer magnetic ring stack 2.

[0044] As Figure 4 shown, according to another embodiment of the present invention, the linear spring 5 is provided outside the sealing housing 6; among them, the upper end of the linear spring 5 is fixedly connected to the upper end of the ejector rod 3 extending out of the sealing housing 6, and the lower end of the linear spring 5 is fixedly connected to the annular spacer 4.

[0045] With the above settings, the linear spring 5 can be arranged outside the whole, so that the maintenance and replacement of the linear spring 5 can be facilitated, which is more beneficial to improving the maintenance convenience of the present invention.

[0046] According to an embodiment of the present invention, the annular spacer 4 is a circular ring structure, and the outer diameter of the annular spacer 4 is equal to the outer diameter of the outer magnetic ring stack 2. Refer to Figure 3 , thus, the consistency of the outer shapes of the outer magnetic ring stack 2 and the annular spacer 4 can be conveniently maintained, so that the nested installation of the sealing housing 6 and the annular spacer 4 can be conveniently realized, which is more beneficial to ensuring the internal structural sealing performance.

[0047] According to another embodiment of the present invention, the annular spacer 4 is a circular ring structure, and the outer diameter of the annular spacer 4 is larger than the outer diameter of the outer magnetic ring stack 2. Refer to Figure 4 , thus, a stepped structure can be formed at the connection position between the annular spacer 4 and the outer magnetic ring stack 2. Further, the sealing housing 6 can be installed in abutment with the annular spacer 4. Correspondingly, the fixed connection of the lower end of the linear spring 5 can be facilitated, effectively improving the installation convenience.

[0048] As Figure 5 shown, according to an embodiment of the present invention, in order to accurately fix the position of the inner magnetic ring stack structure 1, an upper fixing structure 1a1 and a lower fixing structure 1b1 can be further provided; wherein, the upper fixing structure 1a1 connects the upper magnetic ring stack 1a to the ejector rod 3, and the lower fixing structure 1b1 connects the lower magnetic ring stack 1b. Refer to Figure 3 , when the linear spring 5 is installed at the lower end of the ejector rod 3, the ejector rod 3 is integrally in a stepped shaft structure, which includes: a first shaft body part 3a1, a second shaft body part 3a2 and a third shaft body part 3a3 arranged coaxially; wherein, the first shaft body part 3a1 is a threaded shaft with threads provided on its outer surface. Thus, the threaded connection of the upper fixing structure 1a1 and the lower fixing structure 1b1 is realized based on the provided threads. Since the first shaft body part 3a1 needs to be slidably connected to the upper end of the sealing housing 6 by a linear bearing, a corresponding smooth part needs to be provided on the first shaft body part 3a1 for sliding cooperation with the linear bearing to ensure sufficient sliding range.

[0049] Refer to Figure 4 , when the linear spring 5 is installed outside the sealing housing 6, the ejector rod 3 can be integrally set as a smooth shaft. Thus, only the first shaft body part 3a1 needs to be provided, and the setting manner of the first shaft body part 3a1 is the same as the foregoing manner and will not be elaborated herein. Of course, the ejector rod 3 can also be integrally set as a stepped shaft. Thus, the first shaft body part 3a1 and the second shaft body part 3a2 can be provided, and the setting manner of the first shaft body part 3a1 is the same as the foregoing manner and will not be elaborated herein.

[0050] Further, in combination with Figure 5 and Figure 6 As shown, the second shaft body portion 3a2 is a smooth optical shaft to achieve a sliding connection with other structures, so as to accurately limit the sliding direction of the ejector rod 3, avoid its swing during the up and down movement, and fully ensure the operation accuracy and reliability of the present invention. It should be noted that the second shaft body portion 3a2 is an optional setting, that is, when the sliding fit with other structures is not required, the second shaft body portion 3a2 can be cancelled.

[0051] Further, when the third shaft body portion 3a3 needs to be set, the third shaft body portion 3a3 can be set as a threaded shaft with threads on its surface. Thus, a spring connecting member 3a4 for the linear spring 5 can be provided on the third shaft body portion 3a3, so as to ensure the accurate connection of the end of the linear spring 5 and ensure the coaxiality of the linear spring 5 and the ejector rod 3, and further reliably ensure the consistency of the vibration direction of the whole device, improving the operation accuracy and reliability of the present invention.

[0052] In combination with Figure 5 and Figure 6 and Figure 7 As shown, according to an embodiment of the present invention, the upper fixing structure 1a1 includes: an upper support member 1a11 and an upper limiting member 1a12; in this embodiment, the upper support member 1a11 is connected to the first shaft body portion 3a1 by a threaded connection method. Since the first shaft body portion 3a1 is provided with a sufficiently long thread, thus, while realizing the reliable connection between the upper support member 1a11 and the first shaft body portion 3a1 through the threaded connection method, it can also flexibly and accurately adjust the position of the upper support member 1a11 on the first shaft body portion 3a1, so as to ensure the assembly and adjustment accuracy and flexibility of the solution. Correspondingly, the upper magnetic ring stack 1a is coaxially arranged with the first shaft body portion 3a1 by a sleeving method, so that the upper magnetic ring stack 1a can be conveniently brought into abutting contact with the upper support member 1a11, thereby accurately limiting the position of the upper magnetic ring stack 1a. In this embodiment, the upper limiting member 1a12 is also installed on the first shaft body portion 3a1 by a threaded connection method. Among them, the upper support member 1a11 and the upper limiting member 1a12 can be respectively set as annular plate-shaped members, so that the upper support member 1a11 and the upper limiting member 1a12 can accurately and reliably limit the position of the upper magnetic ring stack 1a.

[0053] In another embodiment, the upper limiting member 1a12 is connected to the first shaft body portion 3a1 by means of a threaded connection, and the upper supporting member 1a11 is connected to the upper limiting member 1a12 by means of a threaded connection; wherein, the upper limiting member 1a12 includes: an annular limiting portion and an insertion sleeve coaxially arranged with the annular limiting portion, wherein, the upper magnetic ring stack 1a and the insertion sleeve can be coaxially sleeved to achieve coaxial arrangement therebetween; in addition, since the hollow portion of the insertion sleeve and the annular limiting portion are in communication with each other, thus, a threaded connection between the upper limiting member 1a12 and the first shaft body portion 3a1 can be achieved by providing threads in the hollow portion, correspondingly, threads are provided on the inner ring surface of the upper supporting member 1a11, and threads are provided on the outer side surface of the end of the insertion sleeve away from the annular limiting portion, so as to achieve the threaded connection between the upper supporting member 1a11 and the upper limiting member 1a12, thereby tightly clamping the upper magnetic ring stack 1a to ensure reliable and stable connection.

[0054] In another embodiment, the upper supporting member 1a11 is connected to the first shaft body portion 3a1 by means of a threaded connection, and the upper limiting member 1a12 is connected to the upper supporting member 1a11 by means of a threaded connection. In this embodiment, the upper limiting member 1a12 can be set as a cylindrical structure, an annular abutting portion is provided at its upper end, and connecting threads are provided on the inner side surface of its lower end, correspondingly, threads are provided on the outer side surface of the upper supporting member 1a11, and further, by means of the threaded connection between the upper limiting member 1a12 and the upper supporting member 1a11, the upper magnetic ring stack 1a can be restricted between the upper limiting member 1a12 and the upper supporting member 1a11, wherein, the inner diameter of the cylindrical portion of the upper limiting member 1a12 is set to match the outer diameter of the upper magnetic ring stack 1a, thereby effectively ensuring the coaxiality of the upper magnetic ring stack 1a and the first shaft body portion 3a1. In this embodiment, the upper limiting member 1a12 can be set as a hollow structure, thereby reducing the structural mass of the entire upper limiting member 1a12.

[0055] Combined with Figure 5 and Figure 6 and Figure 8As shown, according to an embodiment of the present invention, the lower fixing structure 1b1 includes: a lower support member 1b11 and a lower limiting member 1b12; in this embodiment, the lower support member 1b11 is connected to the first shaft body portion 3a1 by a threaded connection method. Since the first shaft body portion 3a1 is provided with a sufficiently long thread, thus, while the reliable connection between the lower support member 1b11 and the first shaft body portion 3a1 can be achieved by the threaded connection method, the accurate adjustment of the position of the lower support member 1b11 on the first shaft body portion 3a1 can also be flexibly realized, so as to ensure the assembly and adjustment accuracy and flexibility of the solution. Correspondingly, the lower magnetic ring stack 1b is coaxially arranged with the first shaft body portion 3a1 by a sleeving method. Thus, the abutting contact between the lower magnetic ring stack 1b and the lower support member 1b11 can be conveniently realized, so as to accurately limit the position of the lower magnetic ring stack 1b. In this embodiment, the lower limiting member 1b12 is also installed on the first shaft body portion 3a1 by a threaded connection method. Among them, the lower support member 1b11 and the lower limiting member 1b12 can be respectively set as annular plate-shaped members. Thus, the lower support member 1b11 and the lower limiting member 1b12 can accurately and reliably limit the position of the lower magnetic ring stack 1b.

[0056] In another embodiment, the lower limiting member 1b12 is connected to the first shaft body portion 3a1 by a threaded connection method, and the lower support member 1b11 is connected to the lower limiting member 1b12 by a threaded connection method; among them, the lower limiting member 1b12 includes: an annular limiting portion and an embedded sleeve coaxially arranged with the annular limiting portion. Among them, the coaxial setting between them can be realized by coaxially sleeving the lower magnetic ring stack 1b with the embedded sleeve; in addition, since the hollow portion of the embedded sleeve and the annular limiting portion are in communication with each other, thus, the threaded connection between the lower limiting member 1b12 and the first shaft body portion 3a1 can be realized by setting a thread in the hollow portion. Correspondingly, a thread is provided on the inner ring surface of the lower support member 1b11, and a thread is provided on the outer side surface of the end of the embedded sleeve away from the annular limiting portion, so as to realize the threaded connection between the lower support member 1b11 and the lower limiting member 1b12, so as to achieve the tight clamping of the lower magnetic ring stack 1b and ensure the reliable and stable connection.

[0057] In another embodiment, the lower support member 1b11 is connected to the first shaft body portion 3a1 by means of a threaded connection, and the lower limiting member 1b12 is connected to the lower support member 1b11 by means of a threaded connection. In this embodiment, the lower limiting member 1b12 can be arranged in a cylindrical structure, with an annular abutting portion provided at its lower end and a connecting thread provided on the inner side surface of its upper end. Correspondingly, a thread is provided on the outer side surface of the lower support member 1b11. Thus, through the threaded connection between the lower limiting member 1b12 and the lower support member 1b11, the lower magnetic ring stack 1b can be restricted between the lower limiting member 1b12 and the lower support member 1b11. Among them, the inner diameter of the cylindrical portion of the lower limiting member 1b12 is set to match the outer diameter of the lower magnetic ring stack 1b, thereby effectively ensuring the coaxiality of the lower magnetic ring stack 1b and the first shaft body portion 3a1. In this embodiment, the lower limiting member 1b12 can be arranged in a hollow structure, thereby reducing the structural mass of the entire lower limiting member 1b12.

[0058] According to an embodiment of the present invention, the upper support member 1a11, the upper limiting member 1a12, the lower limiting member 1b12 and the lower support member 1b11 can be made of non-metallic materials (such as nylon materials), or can also be made of non-ferromagnetic metals (such as aluminum alloy, copper alloy, titanium alloy, austenitic stainless steel, etc.) that do not affect the magnetic fields of the upper magnetic ring stack 1a and the lower magnetic ring stack 1b. Thus, while fully ensuring the reliability of its structure, it effectively avoids the accuracy and stability of the operation reliability of this solution.

[0059] According to an embodiment of the present invention, the upper support member 1a11 and the lower support member 1b11 are arranged opposite to each other. Among them, a plurality of threaded holes are arranged at equal intervals in the circumferential direction of the upper support member 1a11, and a plurality of threaded holes are arranged at equal intervals in the circumferential direction of the lower support member 1b11. Moreover, the threaded holes on the upper support member 1a11 and the lower support member 1b11 are coaxially arranged in one-to-one correspondence. Thus, it is convenient to connect the balance support member A between the upper support member 1a11 and the lower support member 1b11. By arranging a plurality of balance support members A at equal intervals in the circumferential direction, the relatively arranged upper magnetic ring stack 1a and the lower magnetic ring stack 1b can fully ensure the accuracy of their relative positions, which is more beneficial for ensuring the optimized fine adjustment of this solution, especially for ensuring the lasting symmetry between the upper sub-symmetry plane and the lower sub-symmetry plane. In addition, the relative positions of the upper magnetic ring stack 1a and the lower magnetic ring stack 1b can also be stably ensured by the arranged balance support member A, so that based on the balance support member A, it can stably restrict the upper magnetic ring stack 1a and the lower magnetic ring stack 1b to still maintain their reliable positions on the first shaft body portion 3a1 after long-term operation.

[0060] In this embodiment, to ensure reliable and flexible adjustment of the support for the upper support member 1a11 and the lower support member 1b11, the threaded holes on the upper support member 1a11 are arranged along the radial direction of the upper support member 1a11 close to the outer edge of the upper support member 1a11, so that the threaded holes are farther from the center, which is more beneficial for accurately maintaining the position of the outer edge of the upper support member 1a11; correspondingly, the threaded holes on the lower support member 1b11 are also arranged along the radial direction of the lower support member 1b11 close to the outer edge of the lower support member 1b11 to match the arrangement position of the threaded holes on the upper support member 1a11.

[0061] As Figure 9 shown, according to an embodiment of the present invention, the balance support member A includes: a first connecting member A1, a second connecting member A2, and a locking cap A3; wherein, the first connecting member A1 is a hollow circular tube structure with internal threaded engagement, and the second connecting member A2 is a cylindrical structure with external threaded engagement on its outer surface. Thus, the first connecting member A1 and the second connecting member A2 are screwed together based on the provided threaded engagement, and then their telescopic function can be achieved by rotating relative to each other; wherein, the outer side of the end of the first connecting member A1 facing away from the second connecting member A2 is provided with threaded engagement to achieve threaded engagement with the threaded hole on the upper support member 1a11; wherein, to facilitate the threaded engagement of the first connecting member A1, a cutting surface for clamping by a clamping tool can be provided on the outer surface of the first connecting member A1 to facilitate its rotation.

[0062] Furthermore, a circular boss with a gradually increasing diameter in the radial direction is provided at the end of the second connecting member A2 facing away from the first connecting member A1. The locking cap A3 is arranged as an annular member, which is rotatably sleeved on the circular boss of the second connecting member A2, and the outer surface of the locking cap A3 has threaded engagement to achieve threaded engagement with the threaded hole on the lower support member 1b11. Then, after the second connecting member A2 is adjusted in place, it can be fixed to the lower support member 1b11 through the locking cap A3. In this embodiment, to facilitate the threaded engagement of the locking cap A3, a cutting surface for clamping by a clamping tool can also be provided on the outer surface of the locking cap A3. Of course, to facilitate the adjustment of the second connecting member A2, a cutting surface for clamping by a clamping tool can also be provided on the outer side of the second connecting member A2, which is also used for the flexible adjustment of the second connecting member A2.

[0063] In this embodiment, for the convenience of the cooperation with the circular boss, the upper end of the locking cap A3 is provided with a through hole for the rod body part of the second connecting member A2 to pass through, and correspondingly, a receiving cavity that can be freely rotatably matched with the circular boss is also provided, so that the free screwing of the locking cap A3 can be conveniently realized. Among them, in order to facilitate its flexible rotation, the locking cap A3 and the circular boss are connected by means of clearance fit. In addition, the depth of the receiving cavity can be less than or equal to the height of the circular boss, so that after the locking cap A3 is screwed into the corresponding threaded hole, it reaches the bottom of the circular boss and presses against the corresponding structure to ensure the reliable and stable connection.

[0064] In this embodiment, the balance support member A can be made of a non-metallic material (such as nylon material), or can also be made of a non-ferromagnetic metal (such as aluminum alloy, copper alloy, titanium alloy, austenitic stainless steel, etc.) that does not affect the magnetic fields of the upper magnetic ring stack 1a and the lower magnetic ring stack 1b. Thus, while fully ensuring the reliability of its structure, the accuracy and stability of the operation reliability of this solution are effectively avoided.

[0065] As Figure 6 shown, according to an embodiment of the present invention, the ejector rod 3 can also be selectively provided with a movable guide member 3a5, wherein the movable guide member 3a5 is of an annular plate-like structure. In this embodiment, a linear bearing is provided on the inner side surface of the movable guide member 3a5 to realize the sliding with the second shaft body part 3a2, and the length of the second shaft body part 3a2 is the length of the sliding.

[0066] In one embodiment, the outer ring surface of the movable guide member 3a5 can be slidably connected to the inner ring surface of the annular pad 4 in a matching manner. Among them, in order to ensure the flexibility of the sliding and reduce the sliding friction, the outer ring surface of the movable guide member 3a5 and the inner ring surface of the annular pad 4 are respectively set as smooth mirror surfaces. Further, the outer ring surface of the movable guide member 3a5 can be provided with grooves communicating with the opposite sides of the movable guide member 3a5. Thus, not only can the sliding contact area be effectively reduced to further reduce the sliding friction between each other, but also lubricating oil or solid lubricating parts (such as graphite) can be filled in the grooves to more fully reduce the sliding friction between each other. Further, an annular groove extending along the circumferential direction of the outer ring surface can also be provided on the outer ring surface of the movable guide member 3a5 to realize the cross-communication with the remaining grooves. Thus, lubricating oil or solid lubricating parts (such as graphite) can be further filled in the annular groove, so that the sliding of this solution is smoother, and the influence on the vibration damping performance between the inner magnetic ring stack structure 1 and the outer magnetic ring stack 2 can be extremely effectively reduced. Of course, in another embodiment, threads can also be provided on the outer ring surface of the movable guide member 3a5, and threads can be provided on the inner ring surface of the annular pad 4. Then, the movable guide member 3a5 can be coaxially connected to the annular pad 4, so that the movable guide member 3a5 can be adjustably installed in the annular pad 4, so that the ejector rod 3 also has sufficient operation reliability and accuracy.

[0067] In this embodiment, elastic buffer members can be provided on the second shaft body portion 3a2 or on the opposite sides of the movable guide member 3a5 to fully avoid possible rigid contact during the sliding of the second shaft body portion 3a2 relative to the movable guide member 3a5, further ensuring the stable use of the present invention.

[0068] In this embodiment, the movable guide member 3a5 can be made of a metal material, such as a non-ferromagnetic metal (such as copper alloy, titanium alloy, austenitic stainless steel, etc.). To effectively reduce its mass, a weight-reducing structure (such as a groove structure) can be further provided on the movable guide member 3a5.

[0069] Through the above settings, based on the provided movable guide member 3a5, it can fully restrict the lower end of the ejector rod 3, effectively ensuring the accuracy and precision of the axial movement of the ejector rod 3. In addition, if the movable guide member 3a5 is set to be slidable relative to both the ejector rod 3 and the annular cushion block 4, thereby, a self-positioning effect can be generated between the movable guide member 3a5 and the ejector rod 3 and the annular cushion block 4, which can fully avoid adaptation to different vibration amplitudes. It can not only effectively shorten the length of the second shaft body portion 3a2, but also fully improve the applicability of the present invention. If the movable guide member 3a5 is set to be threadedly connected to the annular cushion block 4, its position can be accurately arranged, making it applicable to different working states.

[0070] The above content is only an example of the specific solution of the present invention. For the equipment and structures not described in detail therein, it should be understood that the existing general equipment and general methods in the art are adopted for implementation.

[0071] The above is only one solution of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large negative stiffness magnetic spring device for suppressing low-frequency vibration of heavy loads, characterized in that: include: An inner magnetic ring stack structure (1) and an outer magnetic ring stack (2) arranged coaxially; The inner magnetic ring stack structure (1) is movably arranged, and the outer magnetic ring stack (2) is fixedly arranged; Along the axial direction of the outer magnetic ring stack (2), the inner magnetic ring stack structure (1) can reciprocate in the hollow part of the outer magnetic ring stack (2); The inner magnetic ring stack structure (1) comprises an upper magnetic ring stack (1a) and a lower magnetic ring stack (1b) which are symmetrically and spaced apart. The upper magnetic ring stack (1a) and the lower magnetic ring stack (1b) respectively comprise a plurality of coaxially arranged inner magnetic rings; The outer magnetic ring stack (2) comprises a plurality of coaxially arranged outer magnetic rings; Along the axial direction of the inner magnetic ring stack structure (1), the inner magnetic ring stack structure (1) has a first symmetry plane, wherein the magnetization directions of the inner magnetic rings of the upper magnetic ring stack (1a) and the lower magnetic ring stack (1b) are symmetrical about the first symmetry plane; Along the axial direction of the outer magnetic ring stack (2), the outer magnetic ring stack (2) has a second symmetry plane, wherein the magnetization directions of the outer magnetic rings in the outer magnetic ring stack (2) are symmetrical about the second symmetry plane; When the first symmetry plane coincides with the second symmetry plane, the resultant magnetic force between the inner magnetic ring stack structure (1) and the outer magnetic ring stack (2) is 0, and a maximum negative stiffness is generated.

2. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 1, characterized in that: All of the inner magnetic rings and the outer magnetic rings have the same axial thickness.

3. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 2, characterized in that: The magnetization directions of all the inner magnetic rings in the inner magnetic ring stack structure (1) change counterclockwise by 90° from top to bottom; The magnetization directions of all the outer magnetic rings in the outer magnetic ring stack (2) change clockwise by 90° from top to bottom.

4. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 3, characterized in that: The numbers of inner magnetic rings of the upper magnetic ring stack (1a) and the lower magnetic ring stack (1b) are respectively odd numbers; The number of outer magnetic rings in the outer magnetic ring stack (2) is an odd number; The number of outer magnetic rings in the outer magnetic ring stack (2) is greater than the number of inner magnetic rings in the inner magnetic ring stack structure (1).

5. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 4, characterized in that: Along the axial direction of the inner magnetic ring stack structure (1), the upper magnetic ring stack (1a) has an upper sub-symmetric plane, and the lower magnetic ring stack (1b) has a lower sub-symmetric plane; In the upper magnetic ring stack (1a), the magnetization direction of the upper middle inner magnetic ring corresponding to the upper sub-symmetric plane is arranged along the axial direction; In the lower magnetic ring stack (1b), the magnetization direction of the lower middle inner magnetic ring corresponding to the lower sub-symmetric plane is arranged along the axial direction; In the outer magnetic ring stack (2), the magnetization direction of the middle outer magnetic ring corresponding to the second symmetry plane is arranged in the radial direction.

6. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 5, characterized in that: The magnetization direction of the upper middle inner magnetic ring corresponding to the upper secondary symmetry plane is arranged in an axially upward direction; The magnetization direction of the lower middle inner magnetic ring corresponding to the lower secondary symmetry plane is set in an axially downward direction; The magnetization direction of the middle outer magnetic ring corresponding to the second symmetry plane is arranged radially outward.

7. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 6, characterized in that: Also includes: A push rod (3), an annular spacer (4), a linear spring (5) and a sealing housing (6); The top rod (3) is coaxially fixedly connected to the inner magnetic ring stack structure (1); The outer magnetic ring stack (2) is coaxially supported with the annular spacer (4) on the upper side of the annular spacer (4); An upper connecting piece (31) is provided at the upper end of the top rod (3); A lower connecting piece (41) is provided at one end of the annular spacer (4) away from the outer magnetic ring stack (2); The opposite ends of the linear spring (5) are respectively connected to the push rod (3) and the annular cushion block (4); The sealed housing (6) encloses the inner magnetic ring stack structure (1) and the outer magnetic ring stack (2); The upper end of the sealing shell (6) is provided with a sliding through hole for the push rod (3) to extend out and be slidably connected, and the lower end of the sealing shell (6) is connected to the annular gasket (4).

8. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 7, characterized in that: The linear spring (5) is located in a hollow portion surrounded by the outer magnetic ring stack (2) and the annular spacer (4); The upper end of the linear spring (5) is fixedly connected to the lower end of the push rod (3), and the lower end of the linear spring (5) is fixedly connected to the annular cushion block (4).

9. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 7, characterized in that: The linear spring (5) is arranged outside the sealing housing (6); The upper end of the linear spring (5) is fixedly connected to the upper end of the push rod (3) extending out of the sealing housing (6), and the lower end of the linear spring (5) is fixedly connected to the annular gasket (4).

10. The large negative stiffness magnetic spring device for heavy load low frequency vibration suppression according to claim 8 or 9, characterized in that: The annular gasket (4) is a circular ring structure, and the outer diameter of the annular gasket (4) is greater than or equal to the outer diameter of the outer magnetic ring stack (2).

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