Square section-magnetic negative stiffness coupling type low-frequency vibration isolation device simulating hippocampus exoskeleton

Abstract

The invention relates to a low-frequency bionic vibration isolation device, in particular to a novel hippocampus exoskeleton imitating square section-magnetic negative stiffness coupling type vibration isolation device. The invention aims to provide a novel hippocampus exoskeleton imitating square section-magnetic negative stiffness coupling type low-frequency vibration isolation device which has a vibration isolation function, can achieve a more stable vibration isolation effect in the aspect of low-frequency vibration and has the characteristic of more efficient energy absorption. The technical scheme is a novel hippocampus exoskeleton imitating square section-magnetic negative stiffness coupling type low-frequency vibration isolation device. The device is characterized by comprising a top plate, a bottom plate, a central rotating mechanism and vertical guide mechanisms, wherein the top plate and the bottom plate correspond up and down and are horizontally arranged respectively; the central rotating mechanism is arranged in the middle of the device and is positioned between the top plate and the bottom plate; the vertical guide mechanisms are positioned on the left and right sides of the central rotating mechanism and are connected with the top plate and the bottom plate respectively.

Description

Technical Field

[0001] The invention relates to a low-frequency bionic vibration isolation device, in particular to a novel hippocampus exoskeleton-imitation square cross-section-magnetic negative stiffness coupling type vibration isolation device. Background Art

[0002] As high-end equipment in aerospace and other fields gradually develops towards large-scale and lightweight, low-frequency vibrations induced by complex excitations seriously affect the reliability, stability, precision and other indicators of the equipment. Although traditional vibration isolators have simple configurations, high reliability and good stability, they cannot guarantee the load-bearing capacity during low-frequency vibration isolation, and there is a contradiction of "you can't have your cake and eat it too". Bionic vibration isolation is a new type of low-frequency nonlinear vibration isolation technology. It designs bionic vibration isolation structures by simulating the motion stability of organisms in nature and their buffering capacity under complex motion. For example, the bionic X-type vibration isolation structure can obtain beneficial equivalent negative stiffness, nonlinear stiffness, damping and mass through X-shaped or diamond geometric nonlinear design, thereby achieving more robust vibration isolation in the low-frequency region.

[0003] The square cross-section structure of the hippocampal exoskeleton can effectively buffer external impact and compression and protect the spine from damage due to its unique linear-torsion deformation characteristics. When subjected to external forces, this structure consumes energy through the torsion of muscles and the relative sliding movement of bone armor, showing excellent energy absorption capacity. Therefore, it is necessary to design a new type of vibration isolation device that imitates the square cross-section of the hippocampal exoskeleton-magnetic negative stiffness coupling by learning from the hippocampal exoskeleton structure. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology and provide a novel hippocampal exoskeleton-like square cross-section-magnetic negative stiffness coupled low-frequency vibration isolation device, which should have a vibration isolation function and be able to achieve a more robust vibration isolation effect in terms of low-frequency vibration and have more efficient energy absorption characteristics.

[0005] The technical solution of the present invention is:

[0006] A novel low-frequency vibration isolation device of a square cross-section and magnetic negative stiffness coupling type imitating a hippocampus exoskeleton is characterized in that the device comprises a top plate and a bottom plate which correspond to each other and are arranged horizontally, a central rotating mechanism which is arranged in the center of the device and is located between the top plate and the bottom plate, and vertical guiding mechanisms which are located on the left and right sides of the central rotating mechanism and are connected to the top plate and the bottom plate respectively.

[0007] The vertical guide mechanism includes a first guide rod vertically fixed on the left side of the base plate, the top plate slidingly matched with the first guide rod through an installed first top plate bearing, a first spring positioned on the first guide rod through two first spring supports, and a first guide member positioned on the first guide rod through a first linear guide bearing and located at the top end of the first spring, and includes a second guide rod vertically fixed on the right side of the base plate, the top plate slidingly matched with the second guide rod through an installed second top plate bearing, a second spring positioned on the second guide rod through two second spring supports, and a second guide member positioned on the second guide rod through a second linear guide bearing.

[0008] The central rotating mechanism includes a rotating shaft arranged horizontally and connected to the first guide member and the second guide member at both ends, a first turntable and a second turntable rotatably positioned at both ends of the rotating shaft, a second rod member hinged at both ends to respectively connect the right edge of the end face of the first turntable facing the second turntable and the top plate, a third rod member hinged at both ends to respectively connect the left edge of the end face of the first turntable facing the second turntable and the bottom plate, a first rod member hinged at both ends to respectively connect the left edge of the end face of the second turntable facing the first turntable and the top plate, and a fourth rod member hinged at both ends to respectively connect the right edge of the end face of the second turntable facing the first turntable and the bottom plate; a plurality of outer ring permanent magnets arranged in an annular manner are provided on the first turntable, and a plurality of inner ring permanent magnets arranged in an annular manner are provided on the second turntable.

[0009] A plurality of mounting grooves are arranged in an annular manner on the inner end surface of the first turntable and are equipped with permanent magnet covers for covering the mounting grooves, and an outer ring permanent magnet is installed in each mounting groove; a disc-shaped axial mounting groove is coaxially arranged in the central part of the plurality of mounting grooves; one side end surface of the second turntable is connected to a disc-shaped mounting platform through a hollow shaft rod inserted into the rotating shaft, and a plurality of inner ring permanent magnets are arranged in an annular manner in the mounting platform; the mounting platform is inserted into the axial mounting groove, and the outer circumferential surface of the mounting platform corresponds to the inner circumferential surface of the axial mounting groove and maintains a motion gap.

[0010] The magnetic fields of two adjacent outer ring permanent magnets are in opposite directions and are perpendicular to the axis of the rotating shaft, and the magnetic fields of two adjacent inner ring permanent magnets are in opposite directions and are perpendicular to the axis of the rotating shaft.

[0011] The first rod, the second rod, the third rod and the fourth rod have the same rod length; the first turntable and the second turntable have the same radius; and the first rod has a rod length greater than the radius of the first turntable.

[0012] The first rod is parallel to the fourth rod; the second rod is parallel to the third rod.

[0013] The two first spring supports include a first spring lower support fixed to the base plate and a first spring upper support sleeved on the first guide rod, and the first guide rod is vertically inserted and fixed to the base plate through the first spring lower support; the two second spring supports include a second spring lower support fixed to the base plate and a second spring upper support sleeved on the second guide rod, and the second guide rod is vertically inserted and fixed to the base plate through the second spring lower support.

[0014] The beneficial effects of the present invention are:

[0015] 1. The hippocampus-like vibration isolation device consists of a top plate and a bottom plate to simulate the "L"-shaped exoskeleton of a hippocampus, and a turntable in the middle to simulate the central spine. When the top plate is subjected to external excitation, the linear vibration will be converted into torsional vibration, and the rotating turntable will produce beneficial nonlinear mass and damping characteristics, thereby being able to absorb energy more efficiently and improve the low-frequency vibration isolation effect.

[0016] 2. When the top plate of the device is subjected to vibration excitation, the top plate and the bottom plate produce relative linear motion, and at the same time, the rod will drive the two turntables to rotate relative to each other, thereby causing the outer ring permanent magnet embedded in the first turntable and the inner ring permanent magnet embedded in the second turntable to rotate relative to each other, and at the same time provide beneficial nonlinear negative stiffness to improve the overall vibration isolation performance.

[0017] 3. The structure of the device is flexible and adjustable. It can adapt to different load requirements by changing the number, gap, width and rod installation position of the permanent magnets. It can also adapt to different loads and working frequencies by adjusting the stiffness and length of the vertical spring.

[0018] 4. The vertical guide mechanism of the device is symmetrically distributed on both sides of the central rotating mechanism, and has good overall stability.

[0019] 5. The device has a simple structure and is easy to install. It also has complex beneficial nonlinear characteristics and good low-frequency vibration isolation performance, making it suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0021] Figure 2 It is a main structural schematic diagram of the present invention.

[0022] Figure 3 It is a left-view structural schematic diagram of an embodiment of the present invention.

[0023] Figure 4 It is one of the three-dimensional structural schematic diagrams of the central rotating mechanism of an embodiment of the present invention (right front side view).

[0024] Figure 5This is the second schematic diagram of the three-dimensional structure of the central rotating mechanism of the embodiment of the present invention (right rear side view).

[0025] Figure 6 Schematic diagram of the magnetic force direction of the outer ring permanent magnet in an embodiment of the present invention.

[0026] Figure 7 Schematic diagram of the magnetic force direction of the inner ring permanent magnet in an embodiment of the present invention.

[0027] Figure 8 is an exploded view of the central rotating mechanism of an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1. Top plate; 2. Bottom plate; 3. Vertical guide mechanism; 3-1. First top plate bearing; 3-2. Second top plate bearing; 3-3. First guide rod; 3-4. Second guide rod; 3-5. First linear guide bearing; 3-6. Second linear guide bearing; 3-7. First guide member; 3-8. Second guide member; 3-9. First spring upper support; 3-10. Second spring upper support; 3-11. First spring; 3-12. Second spring; 3-13. First spring lower support; 3-14. Second spring Unsprung support; 4, central rotating mechanism; 4-1, top rod support seat; 4-2, first rod; 4-3, second rod; 4-4, first turntable; 4-5, permanent magnet cover; 4-6, second turntable; 4-7, rotating shaft; 4-8, third rod; 4-9, fourth rod; 4-10, bottom rod support seat; 4-11, first bearing; 4-12, second bearing, 4-13 mounting groove, 4-14 axial mounting groove, 4-15 mounting platform; 5, outer ring permanent magnet; 6, inner ring permanent magnet. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] like Figure 1 The novel hippocampus exoskeleton-like square cross-section-magnetic negative stiffness coupling low-frequency vibration isolation device shown comprises a top plate 1, a bottom plate 2, a vertical guide mechanism 3, and a central rotating mechanism 4. The top plate corresponds to the bottom plate in the upper and lower parts and is arranged horizontally. The left and right sides of the top plate are respectively provided with a plurality of screw holes and a through hole, and the middle part of the top plate is provided with two screw holes; the left and right sides of the bottom plate are provided with a plurality of screw holes, and the middle part of the bottom plate is provided with two screw holes.

[0032] like Figure 2 As shown, the central rotating mechanism is arranged in the center of the device and is disposed between the top and the bottom plate, and the vertical guiding mechanism is disposed on the left and right sides of the central rotating mechanism and the upper and lower ends are respectively connected to the top plate and the bottom plate.

[0033] The vertical guide mechanism includes a first top plate bearing 3-1, a first guide rod 3-3, a first linear guide bearing 3-5, a first guide member 3-7, a first spring upper support 3-9, a first spring 3-11, and a first spring lower support 3-13; a second top plate bearing 3-2, a second guide rod 3-4, a second linear guide bearing 3-6, a second guide member 3-8, a second spring upper support 3-10, a second spring 3-12, and a second spring lower support 3-14.

[0034] The first top plate bearing is fixed to the top plate by bolts, and the axis of the first top plate bearing coincides with the axis of the through hole on the left side of the top plate; the top of the first guide rod cooperates with the first top plate bearing and corresponds to the through hole on the left side of the top plate up and down; the first linear guide bearing, the first guide member, the first spring upper support, and the first spring are all positioned in the first guide rod from top to bottom and can be vertically slidable; and, a light hole is provided on the side of the first guide member, the first spring lower support is vertically fixed to the left side of the bottom plate, and the bottom end of the first guide rod is inserted and fixed to the first spring lower support by bolts; the upper and lower ends of the first spring respectively cooperate with the first spring upper support and the first spring lower support.

[0035] The second top plate bearing is fixed to the top plate by bolts, and the axis of the second top plate bearing coincides with the axis of the through hole on the right side of the top plate; the top of the second guide rod cooperates with the second top plate bearing and corresponds to the through hole on the right side of the top plate from top to bottom; the second linear guide bearing, the second guide member, the second spring upper support, and the second spring are all positioned in the second guide rod from top to bottom and can be lifted vertically; and the side of the second guide member is provided with a light hole, the second spring lower support is vertically fixed to the right side of the bottom plate, and the bottom end of the second guide rod is inserted and fixed to the second spring lower support by bolts; the upper and lower ends of the second spring are respectively pressed against the second spring upper support and the second spring lower support. The top plate can be lifted and lowered on the first guide rod and the second guide rod at the same time through the first top plate bearing and the second top plate bearing.

[0036] like Figure 3 , Figure 4 , Figure 5 , Figure 8 As shown, the central rotating mechanism includes a top rod support seat 4-1, a first rod 4-2, a second rod 4-3, a first turntable 4-4, a permanent magnet cover 4-5, a second turntable 4-6, a rotating shaft 4-7, a third rod 4-8, a fourth rod 4-9, a bottom rod support 4-10, a first bearing 4-11, and a second bearing 4-12; an outer ring permanent magnet 5, and an inner ring permanent magnet 6.

[0037] The top rod support seat is installed on the lower end surface of the top plate and fixed to the top plate by bolts; the bottom rod support seat is installed on the upper end surface of the bottom plate and fixed to the bottom plate by bolts; the top rod support seat corresponds to the bottom rod support seat in the vertical direction.

[0038] See also Figure 8 The rotating shaft is arranged horizontally, and the two ends of the rotating shaft are respectively inserted into the light holes of the first guide member and the second guide member and connected by bolts; positioning shoulders are provided on the left and right sides of the rotating shaft, the first bearing is coaxially installed on the left shoulder of the rotating shaft, and the second bearing is coaxially installed on the right shoulder of the rotating shaft, and a rotating slot is provided on the rotating shaft outside the first bearing and the second bearing.

[0039] The first turntable is rotatably positioned on the left side of the rotating shaft through the first bearing; the inner end face of the first turntable is provided with a plurality of (the number of mounting grooves is preferably 10) mounting grooves 4-13 arranged in an annular manner, a disc-shaped axial mounting groove 4-14 is coaxially provided in the middle of the mounting groove, and an axial hole matching the outer ring of the first bearing is provided in the center of the axial mounting groove; an outer ring permanent magnet is installed in each mounting groove, and a permanent magnet cover is provided on the end face of the first turntable for matching the cover mounting groove notch to prevent the outer ring permanent magnet from falling out.

[0040] like Figure 5 , Figure 8 As shown, the second turntable is rotatably positioned on the right side of the rotating shaft through a second bearing, and the inner end surface of the second turntable is connected to a disc-shaped mounting platform through a hollow shaft rod inserted into the rotating shaft. The mounting platform is coaxially arranged with the second turntable, and the second bearing is cooperatively installed between the axial hole of the second turntable and the rotating shaft; a plurality of (preferably 10) inner ring permanent magnets are arranged in an annular manner on the mounting platform; the outer diameter of the mounting platform is smaller than the axial mounting groove of the first turntable, and the mounting platform is inserted into the axial mounting groove and fixed, so that the outer circumferential surface of the mounting platform corresponds to the inner circumferential surface of the axial mounting groove, but a suitable gap is maintained to prevent movement interference.

[0041] In order to prevent the first rotating disk and the second rotating disk from escaping from the rotating shaft, spring retaining rings are inserted into the rotating grooves at the left and right ends of the rotating shaft to limit the first rotating disk and the second rotating disk.

[0042] like Figure 4As shown: the two ends of the second rod 4-3 are respectively hinged to the right edge of the end face of the top rod support seat and the first turntable side (facing the second turntable side), and the two ends of the third rod 4-8 are respectively hinged to the left edge of the bottom rod support seat and the end face on the same side of the first turntable; similarly: the first rod 4-2 is respectively hinged to the left edge of the end face of the top rod support seat and the second turntable side (facing the first turntable side), and the fourth rod is respectively hinged to the right edge of the end face of the bottom rod support seat and the second turntable side; the rod lengths of the first rod, the second rod, the third rod and the fourth rod are equal, and the rod length of the first rod is greater than the radius of the first turntable; the radius of the first turntable and the second turntable are equal; the first rod is parallel to the fourth rod, and the second rod is parallel to the third rod.

[0043] like Figure 6 , Figure 7 As shown, the magnetic fields of two adjacent inner ring permanent magnets in the annular arrangement are opposite in direction, i.e. one is perpendicular to the axis of the rotating shaft and inward (toward the inner diameter direction), and the other is perpendicular to the axis of the rotating shaft and outward (toward the outer diameter direction); correspondingly, the magnetic fields of two adjacent outer ring permanent magnets in the annular arrangement are opposite in direction, i.e. one is perpendicular to the axis of the rotating shaft and inward, and the other is perpendicular to the axis of the rotating shaft and outward. When the first turntable and the second turntable rotate relative to each other, the outer ring permanent magnet and the inner ring permanent magnet can provide a nonlinear negative stiffness, and the first turntable and the second turntable can provide nonlinear mass and nonlinear damping.

[0044] Working principle:

[0045] When the present invention is applied, the top plate is used to withstand external excitation. When the external excitation causes vibration, the top plate is constrained by the two guide rods to vibrate up and down, and the first turntable and the second turntable are driven to rotate relative to each other and move up and down through four rods, while driving the rotating shaft to move up and down, thereby driving the guide member and its bottom spring to deform, and nonlinear damping and nonlinear mass are generated during the movement to consume the energy generated by the vibration, so that the entire device has good low-frequency vibration isolation performance; the relative rotation of the two turntables drives the relative rotation and up and down vibration of the outer ring permanent magnet and the inner ring permanent magnet, thereby generating nonlinear negative stiffness, which can effectively reduce the resonance frequency, widen the vibration isolation bandwidth, and improve the bearing capacity and vibration isolation performance of the structure; at the same time, by changing the width, gap, turntable mass or spring stiffness of the magnet, the load bearing range of the device can be changed and it can adapt to various vibration excitations.

Claims

1. A low-frequency vibration isolation device of square cross-section and magnetic negative stiffness coupling type imitating a hippocampus exoskeleton, characterized in that: The device comprises a top plate (1) and a bottom plate (2) which are arranged horizontally and correspond to each other up and down, a central rotating mechanism (4) arranged in the center of the device and located between the top plate and the bottom plate, and a vertical guiding mechanism (3) which is located on the left and right sides of the central rotating mechanism and connects the top plate and the bottom plate up and down respectively.

2. The hippocampus exoskeleton-like square cross-section-magnetic negative stiffness coupling low-frequency vibration isolation device according to claim 1 is characterized in that: The vertical guide mechanism comprises a first guide rod (3-3) vertically fixed on the left side of the base plate, the top plate slidingly matched with the first guide rod through the installed first top plate bearing (3-1), a first spring (3-11) sleeved and positioned on the first guide rod through two first spring supports, and a first guide member (3-1) sleeved and positioned on the first guide rod through a first linear guide bearing (3-5) and located at the top end of the first spring, and comprises a second guide rod (3-4) vertically fixed on the right side of the base plate, the top plate slidingly matched with the second guide rod through the installed second top plate bearing (3-2), a second spring (3-12) sleeved and positioned on the second guide rod through two second spring supports, and a second guide member (3-8) sleeved and positioned on the second guide rod through a second linear guide bearing (3-6).

3. The hippocampus exoskeleton-like square cross-section-magnetic negative stiffness coupling low-frequency vibration isolation device according to claim 2, characterized in that: The central rotating mechanism comprises a rotating shaft (4-7) arranged horizontally and connected at both ends to the first guide member and the second guide member, a first rotating disk (4-4) and a second rotating disk (4-6) rotatably positioned at both ends of the rotating shaft, a second rod (4-3) respectively hinged at both ends to connect the right edge of the end face of the first rotating disk facing the second rotating disk and the top plate, a third rod (4-8) respectively hinged at both ends to connect the left edge of the end face of the first rotating disk facing the second rotating disk and the bottom plate, a first rod (4-2) respectively hinged at both ends to connect the left edge of the end face of the second rotating disk facing the first rotating disk and the top plate, and a fourth rod (4-9) respectively hinged at both ends to connect the right edge of the end face of the second rotating disk facing the first rotating disk and the bottom plate; a plurality of outer ring permanent magnets (5) arranged in an annular manner are provided on the first rotating disk, and a plurality of inner ring permanent magnets arranged in an annular manner are provided on the second rotating disk.

4. The hippocampus exoskeleton-like square cross-section-magnetic negative stiffness coupling low-frequency vibration isolation device according to claim 3, characterized in that: The inner end surface of the first turntable is provided with a plurality of mounting grooves (4-13) arranged in an annular manner and a permanent magnet cover (4-5) for covering the mounting grooves, and each mounting groove is provided with an outer ring permanent magnet; a disc-shaped axial mounting groove (4-14) is coaxially arranged in the central part of the plurality of mounting grooves; one side end surface of the second turntable is connected to a disc-shaped mounting platform (4-15) through a hollow shaft rod sleeved on the rotating shaft, and the plurality of inner ring permanent magnets are arranged in an annular manner in the mounting platform; the mounting platform is inserted into the axial mounting groove, and the outer circumferential surface of the mounting platform corresponds to the inner circumferential surface of the axial mounting groove and a movement gap is maintained.

5. The hippocampus exoskeleton-like square cross-section-magnetic negative stiffness coupling low-frequency vibration isolation device according to claim 4, characterized in that: The magnetic fields of two adjacent outer ring permanent magnets are in opposite directions and are perpendicular to the axis of the rotating shaft, and the magnetic fields of two adjacent inner ring permanent magnets are in opposite directions and are perpendicular to the axis of the rotating shaft.

6. The hippocampus exoskeleton-like square cross-section-magnetic negative stiffness coupling low-frequency vibration isolation device according to claim 5, characterized in that: The first rod, the second rod, the third rod and the fourth rod have the same rod length; the first turntable and the second turntable have the same radius; and the first rod has a rod length greater than the radius of the first turntable.

7. The hippocampus exoskeleton-like square cross-section-magnetic negative stiffness coupling low-frequency vibration isolation device according to claim 6, characterized in that: The first rod is parallel to the fourth rod; the second rod is parallel to the third rod.

8. The hippocampus exoskeleton-like square cross-section-magnetic negative stiffness coupling low-frequency vibration isolation device according to claim 7, characterized in that: The two first spring supports include a first spring lower support (3-13) fixed to the bottom plate and a first spring upper support (3-9) sleeved on the first guide rod, and the first guide rod is vertically inserted and fixed on the bottom plate through the first spring lower support; the two second spring supports include a second spring lower support (3-14) fixed to the bottom plate and a second spring upper support (3-10) sleeved on the second guide rod, and the second guide rod is vertically inserted and fixed on the bottom plate through the second spring lower support.

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