Ultra-low frequency vibration damping device with three-way negative stiffness characteristics

Abstract

The present application discloses an ultra-low frequency vibration damping device with three-way negative stiffness characteristics, which includes a guide member, a sliding plate, a first mounting plate and a second mounting plate. The sliding plate is slidably arranged on the guide member. A pressure rod is installed between the first mounting plate and the sliding plate, a damping member is installed between the first mounting plate and the second mounting plate, and an elastic member is installed between the sliding plate and the second mounting plate. It also includes a first permanent magnet, a second permanent magnet and a third permanent magnet. Among them, the elastic member realizes the positive stiffness of the vibration damping device in the Z direction, the first permanent magnet, the second permanent magnet and the third permanent magnet realize the negative stiffness of the vibration damping device in the Z direction, and the pressure rod realizes the positive and negative stiffness of the vibration damping device in the X direction and the Y direction. Thus, the vibration damping device has three-way negative stiffness. By introducing three-way negative stiffness, the natural frequency of the vibration damping device can be effectively reduced, so that the vibration damping device has a total stiffness close to zero, further improving the vibration damping performance of the vibration damping device.

Description

Technical Field

[0001] This application relates to the technical field of shock absorption devices, and particularly to an ultra-low frequency shock absorption device with three-way negative stiffness characteristics. Background Art

[0002] Generally, in order to enable a shock absorber to have excellent shock absorption effect, when designing a shock absorber, the setting of stiffness will be reduced to obtain a lower natural frequency of the system, thereby improving the shock absorption performance of the shock absorber.

[0003] In the design ideas of some high-performance shock absorbers, a mechanism with negative stiffness is introduced into the shock absorber system. In this way, the natural frequency of the shock absorber can be effectively reduced, and even the effect of quasi-zero stiffness can be achieved.

[0004] However, most of the shock absorber products on the market currently are positive stiffness. Even if a negative stiffness mechanism is introduced, generally it only has negative stiffness in the vertical direction (single direction) and cannot achieve three-way (vertical, front-back, left-right) negative stiffness. Summary of the Invention

[0005] The purpose of this application is to overcome the deficiencies existing in the prior art and provide an ultra-low frequency shock absorption device with three-way negative stiffness characteristics.

[0006] To achieve the above technical objectives, this application provides an ultra-low frequency shock absorption device with three-way negative stiffness characteristics, including: a guide member extending along the Z direction; a sliding plate slidably arranged on the guide member; a first mounting plate and a second mounting plate, the first mounting plate and the second mounting plate are spaced along the Z direction, and the sliding plate is arranged between the first mounting plate and the second mounting plate; a pressure rod connecting the first mounting plate and the sliding plate; a damping member connecting the first mounting plate and the second mounting plate; an elastic member connecting the sliding plate and the second mounting plate; a first permanent magnet arranged on the sliding plate; a second permanent magnet and a third permanent magnet, the second permanent magnet and the third permanent magnet are spaced along the Z direction, the first permanent magnet is arranged between the second permanent magnet and the third permanent magnet, and the first permanent magnet can be attracted by both the second permanent magnet and the third permanent magnet; wherein, the first permanent magnet has an equilibrium position, and when the first permanent magnet is in the equilibrium position, the resultant force received by the first permanent magnet is 0.

[0007] Furthermore, the ultra-low frequency shock absorption device with three-way negative stiffness characteristics further includes: a first buffer member arranged between the first permanent magnet and the second permanent magnet; a second buffer member arranged between the first permanent magnet and the third permanent magnet.

[0008] Furthermore, the second permanent magnet is arranged on the second mounting plate, the third permanent magnet is arranged between the first mounting plate and the second mounting plate; the ultra-low frequency shock absorption device with three-way negative stiffness characteristics further includes a third buffer member arranged between the third permanent magnet and the first mounting plate.

[0009] Further, a limiting groove is provided on the side of the first mounting plate facing the second mounting plate, and at least a part of the third buffer member is located in the limiting groove.

[0010] Further, threaded holes are provided on the second mounting plate, and threaded sections are provided on the guiding members; the guiding members can be threadedly connected to the second mounting plate through the threaded sections and the threaded holes.

[0011] Further, the ultra-low frequency vibration damping device with three-way negative stiffness characteristics includes four guiding members, and the four guiding members are arranged in a cross direction; the sliding plate includes: a first mounting portion, and a first permanent magnet is arranged in the first mounting portion; four second mounting portions are arranged on the outside of the first mounting portion in the cross direction, and any one of the second mounting portions is sleeved on one of the guiding members.

[0012] Further, the ultra-low frequency vibration damping device with three-way negative stiffness characteristics includes: four pressure bars, and any one of the second mounting portions is connected to one of the pressure bars; and / or, four damping members, and any one of the damping members is located between two adjacent second mounting portions; and / or, four elastic members, and any one of the second mounting portions is connected to one of the elastic members.

[0013] Further, the ultra-low frequency vibration damping device with three-way negative stiffness characteristics further includes: a fixed sleeve, which is arranged on the second mounting plate, and a second permanent magnet is arranged in the fixed sleeve; a threaded sleeve, and a third permanent magnet is arranged in the threaded sleeve; wherein, an external thread is provided on the outer wall of the threaded sleeve, and an internal thread is provided on the inner wall of the fixed sleeve, and the threaded sleeve and the fixed sleeve can be threadedly connected.

[0014] Further, a holding groove is formed on the side edge of the first mounting plate and / or the sliding plate, and a movable piece is arranged on the outside of the holding groove; by pressing the movable piece on the holding groove, the movable piece can fasten the pressure bar located in the holding groove.

[0015] Further, the damping member is a steel wire rope; the ultra-low frequency vibration damping device with three-way negative stiffness characteristics further includes at least a pair of clamping plates, and a pair of clamping plates is used to fix one steel wire rope; among a pair of clamping plates, one of the clamping plates is used to fix one end of the steel wire rope to the first mounting plate, and the other clamping plate is used to fix the other end of the steel wire rope to the second mounting plate.

[0016] The present application provides an ultra-low frequency vibration damping device with triaxial negative stiffness characteristics, including a guide member, a sliding plate, a first mounting plate and a second mounting plate. The sliding plate is slidably arranged on the guide member. A pressure rod is installed between the first mounting plate and the sliding plate, a damping member is installed between the first mounting plate and the second mounting plate, and an elastic member is installed between the sliding plate and the second mounting plate. It further includes a first permanent magnet, a second permanent magnet and a third permanent magnet. The first permanent magnet is arranged between the second permanent magnet and the third permanent magnet, and the first permanent magnet can be attracted by both the second permanent magnet and the third permanent magnet. Among them, the elastic member realizes the positive stiffness of the vibration damping device in the Z direction, and the first permanent magnet, the second permanent magnet and the third permanent magnet realize the negative stiffness of the vibration damping device in the Z direction. When the vibration damping device works near the equilibrium point, the acting force of the negative stiffness spring on the load is almost zero, and the bearing capacity of the system is determined by the linear positive stiffness spring. Once the load vibrates slightly and deviates from the equilibrium position due to the vibration transmission of the foundation, the negative stiffness characteristic of the negative stiffness spring will make the system have a lower dynamic stiffness, thereby improving the vibration isolation performance of the system. The negative stiffness permanent magnet also has a magnetic force with the negative stiffness characteristic based on non-contact magnetic force, which overcomes the mechanical friction defect existing in the mechanical negative stiffness spring and has the characteristics of compact structure and adjustable stiffness. In addition, the pressure rod realizes the positive and negative stiffness of the vibration damping device in the X direction and the Y direction; the damping member realizes the damping of the vibration damping device in the X direction, the Y direction and the Z direction. Thus, the vibration damping device has triaxial negative stiffness. By introducing triaxial negative stiffness, the natural frequency of the vibration damping device can be effectively reduced, making the vibration damping device have a total stiffness close to zero and further improving the vibration damping performance of the vibration damping device. Description of the Drawings

[0017] Figure 1 It is the stiffness curve of an elastic member provided by the present application;

[0018] Figure 2 It is the stiffness curve of a first permanent magnet provided by the present application;

[0019] Figure 3 It is the stiffness curve of a vibration damping device provided by the present application;

[0020] Figure 4 It is an inverted pendulum structure provided by the present application;

[0021] Figure 5 It is the structural schematic diagram of an ultra-low frequency vibration damping device with triaxial negative stiffness characteristics provided by the present application;

[0022] Figure 6 is Figure 5 the structural sectional view of the ultra-low frequency vibration damping device with triaxial negative stiffness characteristics in

[0023] Figure 7 is Figure 5Structural cross-sectional view of an ultra-low frequency vibration damping device with three-way negative stiffness characteristics when subjected to a horizontal force. Specific implementation manners

[0024] To make the above objects, features, and advantages of the present application more apparent and understandable, the specific implementation manners of the present application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0025] The present application provides an ultra-low frequency vibration damping device with three-way negative stiffness characteristics, including: a guide member 11 extending along the Z direction; a sliding plate 12 slidably disposed on the guide member 11; a first mounting plate 13 and a second mounting plate 14, the first mounting plate 13 and the second mounting plate 14 being spaced apart along the Z direction, and the sliding plate 12 being disposed between the first mounting plate 13 and the second mounting plate 14; a compression rod 15 connecting the first mounting plate 13 and the sliding plate 12; a damping member 16 connecting the first mounting plate 13 and the second mounting plate 14; an elastic member 17 connecting the sliding plate 12 and the second mounting plate 14; a first permanent magnet 1 disposed on the sliding plate 12; a second permanent magnet 2 and a third permanent magnet 3, the second permanent magnet 2 and the third permanent magnet 3 being spaced apart along the Z direction, and the first permanent magnet 1 being disposed between the second permanent magnet 2 and the third permanent magnet 3, and the first permanent magnet 1 being capable of being attracted by both the second permanent magnet 2 and the third permanent magnet 3.

[0026] Among them, the first permanent magnet 1 has an equilibrium position, and when the first permanent magnet 1 is in the equilibrium position, the resultant force received by the first permanent magnet 1 is 0.

[0027] First of all, it needs to be explained that stiffness is the ability of a component to resist deformation. Generally speaking, for the same displacement, the greater the load that needs to be applied, the greater the stiffness of the component. Generally, the greater the displacement and the greater the force that needs to be applied, it is positive stiffness; the greater the displacement and the smaller the force that needs to be applied, it is negative stiffness.

[0028] In the vibration damping device provided by the present application, the elastic member 17 is used to achieve positive stiffness in the Z direction.

[0029] With reference to Figure 1 , a positive stiffness curve of an elastic member 17 is illustrated; wherein, the abscissa is the deformation amount of the elastic member 17, the ordinate is the elastic force of the elastic member 17, and the slope of the oblique line is the stiffness of the elastic member 17.

[0030] Specifically, when the vibration damping device is subjected to a Z-direction force, the load is transmitted among the first mounting plate 13, the pressure bar 15, the sliding plate 12, the elastic member 17 and the second mounting plate 14; the elastic member 17 can resist external forces and stress deformation.

[0031] Meanwhile, in the vibration damping device provided by the present application, the magnetic system composed of the first permanent magnet 1, the second permanent magnet 2 and the third permanent magnet 3 is used to achieve negative stiffness in the Z direction.

[0032] Specifically, reference can be made to Figure 5 and Figure 6 , in the illustrated embodiment, the first permanent magnet 1, the second permanent magnet 2 and the third permanent magnet 3 are arranged along the Z direction, and the magnetic directions of the three permanent magnets are the same (as in the case shown in Figure 6 , the three permanent magnets are all set with the S pole on the top and the N pole on the bottom), therefore, the first permanent magnet 1 arranged in the middle can both attract the second permanent magnet 2 with opposite polarity and attract the third permanent magnet 3 with opposite polarity.

[0033] At this time, when the vibration damping device is subjected to a Z-direction force, the load is transmitted to the first permanent magnet 1 through the first mounting plate 13, the pressure bar 15 and the sliding plate 12. During the force transmission process, if the first permanent magnet 1 leaves the equilibrium position, the attractive force from the second permanent magnet 2 received by the first permanent magnet 1 will be greater than the attractive force from the third permanent magnet 3, or the attractive force from the third permanent magnet 3 received by the first permanent magnet 1 will be greater than the attractive force from the second permanent magnet 2; thus, the first permanent magnet 1 will exhibit negative stiffness characteristics, making the system have a lower dynamic stiffness.

[0034] With reference to Figure 2 , a negative stiffness curve of the first permanent magnet 1 is illustrated; wherein, the abscissa is the displacement of the first permanent magnet 1, the ordinate is the resultant force received by the first permanent magnet 1, and the slope of the curve is the magnetic negative stiffness of the first permanent magnet 1.

[0035] It should be added that the guiding member 11 is used to limit the movement direction of the sliding plate 12. When the force is transmitted to the sliding plate 12, the sliding plate 12 can only move in the Z direction along the guiding member 11, which makes the movement of the first permanent magnet 1 show negative stiffness characteristics in the Z direction, but show positive stiffness characteristics in the X direction and the Y direction.

[0036] With reference to Figure 3 , a stiffness curve of the vibration damping device provided by the present application is illustrated (the two dashed lines are respectively the stiffness curves of the elastic member 17 and the first permanent magnet 1, and the solid line is the total stiffness curve of the vibration damping device); wherein, the abscissa is the displacement of the vibration damping device, the ordinate is the resultant force received by the vibration damping device, and the slope of the solid line is the total stiffness of the vibration damping device.

[0037] By Figure 3It can be seen that by the mutual resistance or compensation of the positive and negative stiffnesses, the stiffness of the vibration damping device in the Z direction can be well reduced.

[0038] The vibration damping device provided by the present application realizes low dynamic stiffness near the working point by applying negative stiffness near the working position.

[0039] It should also be supplemented that the permanent magnet type negative stiffness is realized by adopting the first permanent magnet 1, the second permanent magnet 2 and the third permanent magnet 3. Although it has the stiffness non-linear characteristic, by optimizing the geometric parameters of the permanent magnet and reasonably selecting the spacing between the permanent magnets, under micro-amplitude vibration, this stiffness non-linearity is very weak and even negligible, which makes the permanent magnet type negative stiffness provided by the present application can be linearly processed.

[0040] Making the negative stiffness linear, near the working point, the vibration isolation system can be regarded as a linear system; thus, the adverse effects of non-linear dynamics brought by forming low stiffness at the working point by using the non-linear force-displacement characteristic are avoided.

[0041] Furthermore, since the negative stiffness permanent magnet has an unstable equilibrium point, when the vibration damping device simultaneously adopts a linear positive stiffness spring (such as the elastic member 17) and such a negative stiffness spring (such as the negative stiffness system composed of the first permanent magnet 1, the second permanent magnet 2 and the third permanent magnet 3), the vibration damping device works near this equilibrium point, and the acting force of the negative stiffness spring on the load is almost zero, and the load-bearing capacity of the system is determined by the linear positive stiffness spring. Once the load vibrates slightly and deviates from the equilibrium position due to the vibration transmission of the foundation, the negative stiffness characteristic of the negative stiffness spring will make the system have a lower dynamic stiffness, thereby improving the vibration isolation performance of the system.

[0042] In addition, the negative stiffness permanent magnet provided by the present application has a magnetic force with a negative stiffness characteristic based on non-contact magnetic force, which overcomes the mechanical friction defect existing in the mechanical type negative stiffness spring and has the characteristics of compact structure and adjustable stiffness.

[0043] In summary, the elastic member 17 and the magnetic system realize the positive and negative stiffnesses of the vibration damping device provided by the present application in the Z direction.

[0044] In addition, in the vibration damping device provided by the present application, the pressure bar 15 is used to realize the positive and negative stiffnesses in the X direction and the Y direction.

[0045] Specifically, the pressure bar 15 is arranged in an inverted pendulum structure. For the convenience of explanation, first refer to Figure 4, which illustrates a similar inverted pendulum structure. One end of the pendulum rod is fixedly arranged, and the other end is restricted by a load and always remains horizontal (only able to move on a horizontal plane). When the inverted pendulum is in an undisturbed natural state, the pendulum rod is in a stable state; once a disturbance acts horizontally on the load, the load will have a negative stiffness characteristic in the horizontal direction; under small-amplitude vibration, according to the knowledge of engineering material mechanics, the expression of the total horizontal stiffness of this inverted pendulum is: . It can be seen that the expression of the total horizontal stiffness of this inverted pendulum consists of a positive stiffness part and a negative stiffness part. When the load mass exceeds a certain value, this inverted pendulum has a negative stiffness characteristic, otherwise this inverted pendulum is a positive stiffness system.

[0046] In this application, by reasonably selecting the parameters of the pendulum rod and the mass of the load, an extremely low natural frequency in the horizontal direction can be achieved.

[0047] More specifically, in the damping device provided by this application, one end of the pressure rod 15 is connected to the sliding plate 12, and the other end is connected to the first mounting plate 13. Since the sliding plate 12 is restricted by the guide member 11 and can only displace along the Z direction, therefore, the end of the pressure rod 15 connected to the sliding plate 12 cannot displace in the X direction and the Y direction; while the other end of the pressure rod 15 connected to the first mounting plate 13 can displace in the X direction and the Y direction along with the first mounting plate 13.

[0048] With reference to Figures 5 to 7 , in the illustrated embodiment, when an external force acts on the first mounting plate 13 and causes the first mounting plate 13 to displace horizontally relative to the second mounting plate 14, the other end of the pressure rod 15 connected to the first mounting plate 13 will displace accordingly, and the pressure rod 15 deforms; after the external force is removed, the pressure rod 15 can recover.

[0049] In this application, the pressure rod 15 is arranged as an inverted pendulum structure. The pressure rod 15 bears the load force and realizes a negative stiffness characteristic by using the Euler's buckling theory of columns, and is used as a negative stiffness system in the horizontal direction.

[0050] In summary, the connection method of the pressure rod 15 with the first mounting plate 13 and the second mounting plate 14 realizes the positive and negative stiffness of the damping device provided by this application in the X direction and the Y direction.

[0051] In the damping device provided by this application, the damping member 16 connecting the first mounting plate 13 and the second mounting plate 14 is used to realize the damping of the damping device in the X direction, the Y direction and the Z direction. Among them, the damping member 16 can be prepared from flexible materials (such as rubber, plastic, etc.), can also adopt elastic structures such as springs and spring plates, and can also adopt mechanisms such as hydraulic pressure and air pressure. When the damping device vibrates under force, the damping member 16 can hinder the vibration and reduce the amplitude, which is beneficial to the damping effect and can also ensure the structural stability of the damping device.

[0052] In summary, for the vibration damping device provided in this application, the permanent magnet system composed of the first permanent magnet 1, the second permanent magnet 2, and the third permanent magnet 3 can achieve negative stiffness in the Z direction; the inverted pendulum structure composed of the strut 15 can achieve negative stiffness in the X direction and the Y direction; thus, the vibration damping device has triaxial negative stiffness; by introducing triaxial negative stiffness, the natural frequency of the vibration damping device can be effectively reduced, enabling the vibration damping device to have a total stiffness close to zero, and further improving the vibration damping performance of the vibration damping device.

[0053] Among them, the guide member 11 can adopt guiding components such as guide rods and guide rails. This application does not limit the installation position, specific configuration, and specific quantity of the guide member 11.

[0054] In one embodiment, referring to Figure 5 , the guide member 11 adopts a guide post, the guide post extends along the Z direction, and the guide post is fixedly arranged on the second mounting plate 14.

[0055] To facilitate the connection between the guide member 11 and the second mounting plate 14, the second mounting plate 14 is provided with threaded holes, and the guide member 11 is provided with threaded sections; the guide member 11 can be threadedly connected to the second mounting plate 14 through the threaded sections and the threaded holes.

[0056] Combined with referring to Figure 6 , the end of the guide member 11 has a section of thread; during installation, the threaded section is screwed into the threaded hole, and the internal and external threads cooperate to install the guide member 11 onto the second mounting plate 14. By providing the threaded sections and the threaded holes, it not only facilitates the installation of the guide member 11 (no longer requiring steps such as welding for fixation), but also makes the guide member 11 have the characteristic of being detachable, facilitating subsequent operations such as inspection, maintenance, and replacement by users.

[0057] Among them, the slide plate 12 is used to connect the guide member 11 and the first permanent magnet 3, so that the first permanent magnet 3 is located between the second permanent magnet 2 and the third permanent magnet 3 and is restricted by the guide member 11 to move only in the Z direction.

[0058] This application does not limit the specific configuration of the slide plate 12. Among them, at least part of the slide plate 12 is arranged between the first mounting plate 13 and the second mounting plate 14 to facilitate the installation of the strut 15 and the elastic member 17.

[0059] In some embodiments, the guide member 11, the first permanent magnet 3, the second permanent magnet 2, and / or the third permanent magnet 3 are arranged outside the first mounting plate 13 and the second mounting plate 14.

[0060] To protect the permanent magnet system, in another embodiment, the second permanent magnet 2 is arranged on the second mounting plate 14, and the first permanent magnet 3 and the third permanent magnet 3 are arranged between the first mounting plate 13 and the second mounting plate 14.

[0061] Specifically, refer toFigure 5 and Figure 6 In the illustrated embodiment, other structures constituting the vibration damping device are all located between the first mounting plate 13 and the second mounting plate 14. Thus, the first mounting plate 13 and the second mounting plate 14 can protect other structures. Especially during the vibration damping process, it can prevent other structures from interfering with the outside world. At the same time, each structure is tightly connected and supports each other, which is beneficial to the structural stability and vibration damping effect of the vibration damping device.

[0062] This application does not limit the specific configurations and specific quantities of the pressure rod 15, the damping member 16, and the elastic member 17 either.

[0063] In a specific embodiment, the pressure rod 15 is made of a metal material; the damping member 16 is a steel wire rope; the elastic member 17 is a spring.

[0064] To improve the structural stability of the vibration damping device, in one embodiment, the vibration damping device includes four guiding members 11, and the four guiding members 11 are arranged in a cross direction. At the same time, the sliding plate 12 includes: a first mounting portion 12a, and a first permanent magnet 1 is arranged in the first mounting portion 12a; four second mounting portions 12b are arranged on the outside of the first mounting portion 12a in a cross direction, and any one of the second mounting portions 12b is sleeved on one of the guiding members 11.

[0065] Specifically, refer to Figure 5 In the illustrated embodiment, the sliding plate 12 has a cross-symmetrical structure, the first mounting portion 12a is at the center of symmetry, the four second mounting portions 12b are arranged around the first mounting portion 12a at equal intervals, and any two adjacent second mounting portions 12b are perpendicular to each other; the four guiding members 11 are also arranged around the first mounting portion 12a at equal intervals.

[0066] Continue to refer to Figure 5 In, the first mounting portion 12a is in a circular ring shape, and the first permanent magnet 1 is arranged in the circular ring; the four second mounting portions 12b and the four guiding members 11 are arranged around the first permanent magnet 1. A guiding hole is provided on any one of the second mounting portions 12b, and the second mounting portion 12b is sleeved on the corresponding guiding member 11 through the guiding hole; the four groups of guiding systems (the guiding members 11 and the second mounting portions 12b) cooperate to not only ensure the guiding accuracy, but also when an external force acts on the vibration damping device, multiple directions cooperate to resist vibration, and also improve the vibration damping performance.

[0067] To improve the guiding accuracy, the vibration damping device further includes a linear bearing; Figure 6 In the illustrated embodiment, a linear bearing is fixed in a guiding hole by two retaining rings, and the sliding plate 12 is slidably connected to the guiding column through the linear bearing.

[0068] Continue to refer to Figure 5 and Figure 6, in the illustrated embodiment, the vibration damping device includes four compression rods 15, and any one of the second mounting portions 12b is connected to one compression rod 15. One end of any compression rod 15 is connected to the second mounting portion 12b, and the other end is connected to the first mounting plate 13. The four compression rods 15 cooperate to form a more stable inverted pendulum structure; the four compression rods 15 can also jointly resist loads and adapt to deformations, which is beneficial to the structural rigidity.

[0069] Continue to refer to Figure 5 and Figure 6 , in the illustrated embodiment, the vibration damping device includes four damping members 16, and any one of the damping members 16 is located between two adjacent second mounting portions 12b. In this way, the gap between the structures can be well utilized, and the damping performance in all directions can be ensured.

[0070] Continue to refer to Figure 5 and Figure 6 , in the illustrated embodiment, the vibration damping device includes four elastic members 17, and any one of the second mounting portions 12b is connected to an elastic member 17. The elastic member 17 can support the second mounting portion 12b and prevent the second mounting portion 12b from actively moving along the guide member 11; at the same time, the elastic member 17 also provides a stable and reliable positive stiffness in the Z direction for the vibration damping device.

[0071] Furthermore, Figure 5 in the illustrated embodiment, the elastic member 17 is sleeved on the guide member 11. At this time, the guide member 11 can also limit the deformation direction of the elastic member 17 to ensure that the elastic member 17 realizes elastic positive stiffness in the Z direction.

[0072] To facilitate the installation of the third permanent magnet 3, the vibration damping device further includes a fixing sleeve 31, the fixing sleeve 31 is provided on the second mounting plate 14, and the second permanent magnet 2 and the third permanent magnet 3 are provided in the fixing sleeve 31.

[0073] Among them, the second permanent magnet 2 can be fixed on the inner wall of the fixing sleeve 31 or on the second mounting plate 14. The second permanent magnet 2 and the third permanent magnet 3 are relatively fixed in the Z direction.

[0074] The fixing sleeve 31 can not only provide an installation position for the third permanent magnet 3, but also hide and protect the three permanent magnets, and can also limit the movement direction of the first permanent magnet 1 to a certain extent.

[0075] Figure 5 in the illustrated embodiment, the fixing sleeve 31 is provided on the second mounting plate 14 and is located between the four guide members 11; four avoidance holes are provided on the fixing sleeve 31, and any one of the second mounting portions 12b extends out from one avoidance hole.

[0076] Furthermore, the vibration reduction device also includes a threaded sleeve 32, and the third permanent magnet 3 is arranged in the threaded sleeve 32; the outer wall of the threaded sleeve 32 is provided with an external thread, and the inner wall of the fixed sleeve 31 is provided with an internal thread; the threaded sleeve 32 and the fixed sleeve 31 can be threadedly connected through internal and external threads.

[0077] By means of threaded connection, the third permanent magnet 3 can be quickly installed and removed relative to the fixed sleeve 31; by adjusting the depth of the threaded connection, the distance between the second permanent magnet 2 and the third permanent magnet 3 can also be adjusted, thereby adjusting the stiffness.

[0078] Optionally, the first permanent magnet 1 is glued to the slide plate 12 .

[0079] Optionally, the second permanent magnet 2 is glued to the fixing sleeve 31 or the second mounting plate 14 .

[0080] Optionally, the third permanent magnet 3 is glued into the fixing sleeve 31 or the threaded sleeve 32 .

[0081] Optionally, the vibration reduction device provided in the present application further includes a first buffer member 21 , which is disposed between the first permanent magnet 1 and the second permanent magnet 2 .

[0082] Optionally, the vibration reduction device provided in the present application further includes a second buffer member 22 disposed between the first permanent magnet 1 and the third permanent magnet 3 .

[0083] Optionally, the vibration reduction device provided in the present application further includes a third buffer member 23 , and the third buffer member 23 is disposed between the third permanent magnet 3 and the first mounting plate 13 .

[0084] The buffer (the first buffer 21 , the second buffer 22 or the third buffer 23 ) is made of a flexible material, such as rubber, plastic, etc. The buffer has a certain elasticity and can be deformed when subjected to force.

[0085] By providing a buffer between two adjacent permanent magnets, it is possible to prevent the two adjacent permanent magnets from colliding with each other when they are close to each other. In some embodiments, the buffer can also prevent the two adjacent permanent magnets from contacting each other, especially in special cases, it can prevent the two adjacent permanent magnets from being closely adsorbed due to excessive mutual attraction, which is conducive to the recovery and stable operation of the vibration reduction device.

[0086] Figure 6 In the illustrated embodiment, the first buffer 21 is disposed on the side of the second permanent magnet 2 facing the first permanent magnet 1, and the first buffer 21 is configured as a circular ring that wraps around the step of the second permanent magnet 2. The second buffer 22 is disposed on the side of the third permanent magnet 3 facing the first permanent magnet 1, and the second buffer 22 is configured as a circular ring that wraps around the step of the third permanent magnet 3.

[0087] Optionally, the buffer is glued to the permanent magnet.

[0088] Installing a buffer between the third permanent magnet 3 and the first mounting plate 13 can prevent the first mounting plate 13 from hitting the third permanent magnet 3, and can also define the lower limit of the movement of the first mounting plate 13 in the Z direction and prevent the first mounting plate 13 from approaching the second mounting plate 14 too closely.

[0089] Referring to Figure 6 , in the illustrated embodiment, the damping device includes a fixed sleeve 31 and a threaded sleeve 32. The third permanent magnet 3 and the third buffer 23 are both disposed in the threaded sleeve 32. The third buffer 23 is generally convex-shaped. The large bottom frustum of the third buffer 23 is disposed in the threaded sleeve 32, and the small top frustum protrudes from the threaded sleeve 32 and faces the first mounting plate 13.

[0090] Further, a limiting groove 13a is provided on one side of the first mounting plate 13 facing the second mounting plate 14, and at least a part of the third buffer 23 is located in the limiting groove 13a.

[0091] Continuing to refer to Figure 6 , in the illustrated embodiment, a cylindrical limiting groove 13a is provided on the lower surface of the first mounting plate 13. The small frustum of the third buffer 23 protruding from the threaded sleeve 32 extends into the limiting groove 13a. It is easy to understand that when the first mounting plate 13 continuously approaches the second mounting plate 14 in the Z direction, it will abut against the third buffer 23, and the third buffer 23 can hinder the approaching movement of the first mounting plate 13. When the first mounting plate 13 moves in the X direction and the Y direction, the groove wall of the limiting groove 13a will contact the third buffer 23, and the third buffer 23 can also prevent the horizontal movement of the first mounting plate 13. Thus, the arrangement of the limiting groove 13a and the third buffer 23 limits the movement range of the first mounting plate 13. Through the flexible design of the third buffer 23, it can also play a role in offsetting vibration.

[0092] Optionally, holding grooves are formed on the sides of the first mounting plate 13 and the slide plate 12, and a movable piece 12c is provided outside the holding grooves. By pressing the movable piece 12c against the holding groove, the movable piece 12c can fasten the pressure rod 15 located in the holding groove.

[0093] Specifically, referring to Figure 5 , in the illustrated embodiment, a holding groove is provided on each of the four sides of the first mounting plate 13, and a holding groove is also provided at the edge of each second mounting portion 12b. One end of the holding groove is open to facilitate the formation of the movable piece 12c, and a round hole is provided at the other end of the holding groove for accommodating the cylindrical pressure rod 15.

[0094] When installing the pressure rod 15, pull the movable piece 12c outwards to enlarge the round hole for the pressure rod 15 to extend in. After the pressure rod 15 is in place, push the movable piece 12c inwards to make the movable piece 12c press against the pressure rod 15, thereby fixing the pressure rod 15.

[0095] To ensure the fastening force of the movable piece 12c on the pressure rod 15, in one embodiment, mounting holes are provided on the groove wall of the holding groove and the movable piece 12c, and at least the mounting hole on the groove wall of the holding groove is a threaded hole, so that the two mounting holes face each other, and screws are inserted into the two mounting holes, and the movable piece 12c can press the pressure rod 15 in the holding groove.

[0096] Alternatively, a slot and a plug are respectively provided on the groove wall of the holding groove and the movable piece 12c, so that the plug is inserted into the slot, and the movable piece 12c and the holding groove can be fastened.

[0097] Or, a spring presser and a positioning hole are respectively provided on the groove wall of the holding groove and the movable piece 12c; pressing the spring presser so that its pin part is inserted into the positioning hole can fasten the movable piece 12c and the holding groove.

[0098] This application does not limit the fastening and moving manners of the movable piece 12c relative to the holding groove.

[0099] In one embodiment, the damping member 16 is a steel wire rope; to facilitate the installation of the steel wire rope, the vibration damping device provided in this application further includes at least a pair of clamping plates 33, and a pair of clamping plates 33 are used to fix a steel wire rope.

[0100] Among a pair of clamping plates 33, one of the clamping plates 33 is used to fix one end of the steel wire rope to the first mounting plate 13, and the other clamping plate 33 is used to fix the other end of the steel wire rope to the second mounting plate 14.

[0101] For details, reference may be made to Figure 5 , in the illustrated embodiment, a groove is provided on one side surface of the clamping plate 33 for accommodating the steel wire rope; through mounting holes are provided on the clamping plate 33, and threaded holes are provided on the first mounting plate 13 and the second mounting plate 14; so that the mounting holes on the clamping plate 33 face the threaded holes on the first mounting plate 13 or the second mounting plate 14, and screws are inserted to fix the clamping plate 33 on the first mounting plate 13 or the second mounting plate 14.

[0102] The above embodiments only represent several implementation manners of this application, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application patent shall be subject to the appended claims.

Claims

1. An ultra-low frequency vibration damping device with three-way negative stiffness characteristics, characterized in that, Comprising: A guide member (11) extending along the Z direction; A slide plate (12) slidably disposed on the guide member (11); A first mounting plate (13) and a second mounting plate (14), the first mounting plate (13) and the second mounting plate (14) being spaced apart along the Z direction, and the slide plate (12) being disposed between the first mounting plate (13) and the second mounting plate (14); A pressure rod (15) connecting the first mounting plate (13) and the slide plate (12), the pressure rod (15) being arranged in an inverted pendulum structure, and realizing the positive and negative stiffness of the vibration damping device in the X direction and the Y direction by using the Euler pressure rod principle; A damping member (16) connecting the first mounting plate (13) and the second mounting plate (14); An elastic member (17) connecting the slide plate (12) and the second mounting plate (14); A first permanent magnet (1) disposed on the slide plate (12); A second permanent magnet (2) and a third permanent magnet (3), the second permanent magnet (2) and the third permanent magnet (3) being spaced apart along the Z direction, the first permanent magnet (1) being disposed between the second permanent magnet (2) and the third permanent magnet (3), and the first permanent magnet (1) being able to be attracted by both the second permanent magnet (2) and the third permanent magnet (3); Wherein, the first permanent magnet (1) has an equilibrium position, and when the first permanent magnet (1) is in the equilibrium position, the resultant force received by the first permanent magnet (1) is 0; The ultra-low frequency vibration damping device with three-way negative stiffness characteristics includes four guide members (11), and the four guide members (11) are arranged in a cross direction; The slide plate (12) includes: A first mounting portion (12a), and the first permanent magnet (1) is disposed in the first mounting portion (12a); Four second mounting portions (12b), the four second mounting portions (12b) being disposed outside the first mounting portion (12a) in a cross direction, and any one of the second mounting portions (12b) being sleeved on one of the guide members (11): Four pressure rods (15), and any one of the second mounting portions (12b) is connected to one of the pressure rods (15); Four damping members (16), and any one of the damping members (16) is located between two adjacent second mounting portions (12b); Four elastic members (17), and any one of the second mounting portions (12b) is connected to one of the elastic members (17).

2. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 1, characterized in that, Further comprising: A first buffer member (21) disposed between the first permanent magnet (1) and the second permanent magnet (2); A second buffer member (22) disposed between the first permanent magnet (1) and the third permanent magnet (3).

3. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 2, characterized in that The second permanent magnet (2) is disposed on the second mounting plate (14), and the third permanent magnet (3) is disposed between the first mounting plate (13) and the second mounting plate (14); The ultra-low frequency vibration damping device with three-way negative stiffness characteristics further includes a third buffer member (23), and the third buffer member (23) is disposed between the third permanent magnet (3) and the first mounting plate (13).

4. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 3, characterized in that, A limiting groove (13a) is provided on one side of the first mounting plate (13) facing the second mounting plate (14), and at least a part of the third buffer member (23) is located in the limiting groove (13a).

5. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 3, characterized in that, The first buffer member (21), the second buffer member (22), and the third buffer member (23) are made of a flexible material, have a certain elasticity, and can deform under force.

6. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 3, characterized in that, The first buffer member (21), the second buffer member (22), and the third buffer member (23) are adhesively bonded to the permanent magnet.

7. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 1, characterized in that, Threaded holes are provided on the second mounting plate (14), and threaded sections are provided on the guiding member (11); The guiding member (11) can be threadedly connected to the second mounting plate (14) through the threaded section and the threaded hole.

8. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 1, characterized in that, The ultra-low frequency vibration damping device with three-way negative stiffness characteristics further includes: A fixed sleeve (31) is disposed on the second mounting plate (14), and the second permanent magnet (2) is disposed in the fixed sleeve (31); A threaded sleeve (32), and the third permanent magnet (3) is disposed in the threaded sleeve (32); Wherein, an external thread is provided on the outer wall of the threaded sleeve (32), an internal thread is provided on the inner wall of the fixed sleeve (31), and the threaded sleeve (32) and the fixed sleeve (31) can be threadedly connected.

9. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 1, characterized in that A holding groove is formed on the side of the first mounting plate (13) and / or the sliding plate (12), and a movable piece (12c) is provided outside the holding groove; By pressing the movable piece (12c) against the holding groove, the movable piece (12c) can fasten the pressure rod (15) located in the holding groove.

10. The ultra-low frequency vibration damping device with three-way negative stiffness characteristics according to claim 1, characterized in that, The damping member (16) is a steel wire rope; The ultra-low frequency vibration damping device with three-way negative stiffness characteristics further includes at least a pair of clamping plates (33), and a pair of clamping plates (33) are used to fix one steel wire rope; Among a pair of clamping plates (33), one of the clamping plates (33) is used to fix one end of the steel wire rope to the first mounting plate (13), and the other clamping plate (33) is used to fix the other end of the steel wire rope to the second mounting plate (14).

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