Three-dimensional low-cost nonlinear quasi-zero-stiffness cultural relic shock isolation device

Abstract

A three-dimensional low-cost nonlinear quasi-zero-stiffness cultural relic shock insulation device comprises an upper plate vertical shock insulation mechanism assembly, a lower plate horizontal shock insulation mechanism assembly, upper and lower plate locking bolts, a magnetic bead seat, a dust cover and a heavy corner pad. The upper plate vertical shock isolation mechanism assembly achieves quasi-zero stiffness vertical shock isolation through a main and auxiliary spring structure, and the lower plate horizontal shock isolation mechanism assembly achieves horizontal shock isolation through cooperation of a guide rail sliding block mechanism and a spring. The upper plate vertical shock isolation mechanism assembly and the lower plate horizontal shock isolation mechanism assembly are locked and fixed through upper and lower plate locking bolts. The magnetic bead seats are installed on the edges of the upper plate vertical shock isolation mechanism assembly and the lower plate horizontal shock isolation mechanism assembly, and the magnetic bead seats attract the dust cover through built-in magnets for dust prevention. And the heavy corner pads are mounted at four corners below the lower plate horizontal shock isolation mechanism assembly. The three-dimensional cultural relic shock insulation device is provided with an upper layer and a lower layer, the upper layer is composed of quasi-zero-stiffness main and auxiliary spring sets to achieve vertical shock insulation, and the lower layer is composed of guide rail sliding block mechanisms matched with springs to achieve horizontal shock insulation.

Description

Technical Field

[0001] The invention relates to a three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device, which is suitable for three-dimensional seismic isolation protection of collections and peripheral cultural relics. Background Art

[0002] The response of the cultural relics display cabinets and the exhibition hall floor under the action of earthquake will be related to the degree of damage to the cultural relics. Usually, the museum cultural relics display cabinets are made of steel and float on the ground surface. They have the characteristics of large length and width, large height and width, large deadweight, and high natural frequency. The ground where the museum is located is usually made of stone hard rock, which has a high modal natural frequency and transmits earthquakes violently. Therefore, it is very necessary to isolate the cultural relics display cabinets and the exhibition hall floor.

[0003] The article "Isolation protection and vibration table test of floating cultural relics" (Engineering Science and Technology, 2023, 55(5):31-40) introduces a two-dimensional modular cultural relic isolation support device, which consists of three layers: a panel, an intermediate plate, a sealing plate and a bottom plate. On the one hand, the guide rail slider mechanism serves as the shock absorption unit of the isolation table; on the other hand, the spring and friction damper realize the shock absorption function. This type of isolation device has a good isolation effect, but it will still decrease with the increase of the input acceleration of the table surface. Nevertheless, for cultural relics with poor anti-overturning ability, traditional seismic measures are more needed to assist. However, in actual use, this type of cultural relic isolation device should fully consider the shock absorption rate target, isolation displacement requirements, support deformation capacity limit and self-reset ability, etc. There is a need to make trade-offs between multiple goals, which are difficult to meet at the same time. At the same time, this isolation device is a two-dimensional isolation device that is only useful for seismic waves in the horizontal direction and cannot play a seismic isolation role for vertical seismic waves.

[0004] "A Seismic Isolation Device for Precious Cultural Relics" (Solid Rocket Technology, 2020, 43(6)837-838) and Chinese Patent (Application No. 201910477381.5) draw on the structural design of the solid rocket engine bead-bearing nozzle and adopt a structural design solution of ball + slide plate + return spring + damper. This type of seismic isolation device can achieve seismic isolation in two-dimensional directions. It has large bearing capacity, low friction, high seismic isolation efficiency, strong environmental resistance, and good anti-aging performance. However, in actual use, the cost of the ball slide plate design is high, and the lower plate needs to be chrome-plated to increase the hardness. The process is difficult to implement and difficult to maintain and replace. At the same time, this solution is only effective for seismic waves in the horizontal two-dimensional cultural relic isolation direction.

[0005] A low-cost linear guide lightweight seismic isolation device is designed in the Chinese patent (application number 201110395325.4). This type of seismic isolation device is small in size and has high seismic isolation efficiency. It can provide effective seismic isolation for lightweight cultural relics. The spring guide rod design can prevent instability. The universal shaft bearing is used to improve the seismic isolation efficiency. At the same time, the standard slider guide assembly that is easy to purchase on the market can greatly reduce the production cost, and can provide functional integration and customization services for the display cabinet. This solution achieves low cost based on the traditional two-dimensional seismic isolation technology solution, but still cannot achieve seismic isolation in three-dimensional directions. The Chinese patent CN209494870U is named a rolling bearing cultural relic display cabinet three-dimensional vibration isolation device, which consists of a seismic isolation plate, a buffer device, a roller, a sealing plate, a vertical seismic isolation device, etc. Since the rolling bearing device is used to achieve seismic isolation, it has a high cost, high maintenance cost, short life, and is difficult to replace. The above patents have great limitations in the field of cultural relic seismic isolation.

[0006] In summary, there are few cultural relics vibration isolation devices that can simultaneously meet the requirements of three-dimensional seismic isolation, easy disassembly and replacement, low cost, high reliability, and integrated customization. Summary of the invention

[0007] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device, which is a three-dimensional cultural relic seismic isolation device with two layers, the upper layer of which is composed of a quasi-zero stiffness main and auxiliary spring group to achieve vertical seismic isolation, and the lower layer is composed of a guide rail slider mechanism and a spring to achieve horizontal seismic isolation.

[0008] The technical solution of the present invention is:

[0009] A three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device, comprising an upper plate vertical seismic isolation mechanism assembly, a lower plate horizontal seismic isolation mechanism assembly, upper and lower plate locking bolts, a magnetic bead seat, a dust cover, and a heavy-duty ground corner pad;

[0010] The upper plate vertical isolation mechanism assembly realizes quasi-zero stiffness vertical isolation through the main and auxiliary spring structures, and the lower plate horizontal isolation mechanism assembly realizes horizontal isolation through the guide rail slider mechanism and the spring; the upper plate vertical isolation mechanism assembly and the lower plate horizontal isolation mechanism assembly are locked and fixed by the upper and lower plate locking bolts; the magnetic bead seat is installed at the edges of the upper plate vertical isolation mechanism assembly and the lower plate horizontal isolation mechanism assembly, and the magnetic bead seat absorbs the dust cover through the built-in magnet for dust prevention; heavy-duty corner pads are installed at the four corners below the lower plate horizontal isolation mechanism assembly.

[0011] Further, the upper plate vertical seismic isolation mechanism assembly includes an upper plate, a middle plate, a main spring, a second upper support ear, a second lower support ear, a spring guide sleeve mechanism, a secondary spring, a connecting pin and a hinge device;

[0012] Among them, a sleeve is arranged at the center of the lower side of the upper plate, and a sleeve is arranged at the center of the upper side of the middle plate. The upper plate and the middle plate are connected by the sleeve. When the cultural relics are placed on the seismic isolation platform, the relative distance between the upper plate and the middle plate becomes smaller due to the influence of the gravity of the cultural relics, and the sleeve and the sleeve slide relative to each other in the vertical direction. The sleeve is located outside the sleeve to realize the guiding effect of the spring in the vertical direction. The main spring is installed on the middle plate and located inside the sleeve.

[0013] The four auxiliary springs are evenly distributed around the main spring and the auxiliary springs face the main spring; the auxiliary spring is sleeved on a spring guide sleeve mechanism for directional traction, and the spring guide sleeve mechanism consists of a sleeve and a sleeve, which controls the extension and contraction of the spring along the guide direction to prevent the system from becoming unstable; one end of the spring guide sleeve mechanism is connected to the connecting pin at the lower end of the second upper support ear, so that the spring guide sleeve mechanism can vertically rotate around the connecting pin at the lower end of the second upper support ear, and the upper end of the second upper support ear is connected to the upper plate; the lower end of the second lower support ear is fixed on the middle plate, and the other end of the spring guide sleeve mechanism is connected to the connecting pin at the upper end of the second lower support ear, so that the spring guide sleeve mechanism can vertically rotate around the connecting pin at the upper end of the second lower support ear, and the upper end of the second lower support ear is connected to the middle plate; the four corners of the upper plate and the middle plate are connected by a hinge device to realize the adjustment of the angle and height of the vertical activity, and the four hinge devices are centrally symmetrically distributed.

[0014] Furthermore, the quasi-zero stiffness vertical seismic isolation effect of the upper plate vertical seismic isolation mechanism assembly is achieved through the cooperation of 1 main spring and 4 auxiliary springs.

[0015] Furthermore, after the sleeve is sleeve-connected, it serves as a vertical guide mechanism for the main spring.

[0016] Furthermore, the horizontal spring stiffness components of the four auxiliary springs are balanced with each other, and the vertical spring stiffness components are opposite to the main spring stiffness, so that the vertical spring stiffness components are balanced with the main spring stiffness.

[0017] Further, the hinge device includes a first upper support ear (connecting the upper hinge and the upper plate), a first lower support ear (connecting the lower hinge and the middle plate), an upper hinge, a lower hinge and a hinge connecting bolt;

[0018] The first upper support ear is fixed on the upper plate and connected to one end of the upper hinge through a pin shaft. The first lower support ear is fixed on the middle plate and connected to one end of the lower hinge through a pin shaft. The other end of the upper hinge is connected to the other end of the lower hinge through a hinge connecting bolt.

[0019] Furthermore,

[0020] The spring stiffness between the main spring and the auxiliary spring is matched to achieve a quasi-zero stiffness design. The force balance and the spatial quasi-zero stiffness balance of the main and auxiliary springs are obtained according to the following formulas (1) and (2):

[0021] M×9.8=K m (L M0 -L M ) (1)

[0022]

[0023] in,

[0024] M is the mass of the artifact on the vibration isolation device;

[0025] L M0 is the original length of the main spring;

[0026] L M is the assembly length of the main spring;

[0027] K m is the stiffness of the main spring;

[0028] K s is the stiffness of a single secondary spring;

[0029] L S0 is the original length of the secondary spring;

[0030] L s is the assembly length of the secondary spring;

[0031] ΔX is the compressed length of the main spring.

[0032] Furthermore, the lower plate horizontal seismic isolation assembly includes a lower plate, a well-shaped guide rail slider device, a guide rod fixed support, a guide rod, a tension and compression spring, a spring limit support, and a limit baffle mechanism;

[0033] The cross-shaped guide rail slider device includes four cross sliders, two upper guide rails and two lower guide rails. The upper guide rails are fixedly connected to the middle plate with bolts, the lower guide rails are fixedly connected to the lower plate with bolts, the upper and lower guide rails are connected by cross sliders, and the cross sliders are fixedly connected to the limit stopper mechanism with bolts.

[0034] The upper and lower guide rods are respectively fixed to the middle plate and the lower plate through guide rod connecting supports; a tension and compression spring is sleeved on the guide rod, one end of the tension and compression spring is connected to the guide rod connecting support, and the other end is connected to the spring limit support on the well-shaped guide rail slider device, and the spring limit support is fixed on the cross slider;

[0035] The translation of the tension and compression spring along the guide rail direction and the change of the spring length are achieved through the traction of the guide rod and the limiting of the spring limiting support on the cross-shaped guide rail slider device.

[0036] Furthermore, the upper and lower layers of guide rods are also arranged in a tic-tac-toe shape, the tension provided by the two tension and compression springs on the upper layer are in opposite directions, and the tension provided by the two tension and compression springs on the lower layer are in opposite directions, thereby achieving horizontal seismic isolation.

[0037] Furthermore, it also includes a buffer rubber pad, which is respectively installed on the middle plate and the lower plate. When the cross slider moves along the guide rail, the limit baffle mechanism collides with the buffer rubber pad to prevent it from falling off the guide rail, thereby ensuring safety.

[0038] The beneficial effects of the present invention compared with the prior art are:

[0039] (1) The present invention adopts a mature guide rail slider mechanism and a spring group sleeve sleeve mechanism to respectively achieve horizontal and vertical seismic isolation. Compared with the existing multi-ball bearing solution, standard parts are easy to purchase, the process cost is lower, and it is easy to replace and maintain.

[0040] (2) The present invention adopts a main and auxiliary spring group structure similar to an automobile suspension mechanism in combination with a hinge mechanism to achieve vertical seismic isolation. The axial connection moving height can be flexibly selected between +20mm and -20mm. Compared with the prior art solution of a sleeve and a vertical spring, the three-dimensional seismic isolation effect is better.

[0041] (3) The present invention adopts four symmetrical hinge mechanisms in conjunction with the main and auxiliary spring mechanisms, so that the structure has good stability and torsion resistance, and adopts a quasi-zero stiffness main and auxiliary spring group structural design to increase the flexibility of the system, and its modal frequency approaches zero, so that the vibration isolation rate and seismic isolation effect of the system will be more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is an overall side view of the load-bearing weight of the seismic isolation device of the present invention;

[0043] Figure 2 It is a side view of the upper vertical isolation layer of the isolation device of the present invention;

[0044] Figure 3 This is a structural diagram of the upper quasi-zero stiffness spring group of the seismic isolation device of the present invention;

[0045] Figure 4 This is the quasi-zero stiffness equilibrium diagram of the upper spring group of the seismic isolation device of the present invention;

[0046] Figure 5 It is a top view of the lower horizontal isolation layer of the isolation device of the present invention;

[0047] Figure 6 It is a partial enlarged view of the lower limit support of the seismic isolation device of the present invention;

[0048] Figure 7 This is a diagram showing the relative positions of the lower block limit device and the buffer rubber pad of the seismic isolation device of the present invention. DETAILED DESCRIPTION

[0049] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0050] like Figure 1 As shown, the present invention proposes a three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device, which can be divided into two layers, an upper plate vertical seismic isolation mechanism assembly 1, a lower plate horizontal seismic isolation mechanism assembly 2, upper and lower plate locking bolts 3, a magnetic bead seat 4, a dust cover 5, and a heavy-duty corner pad 6.

[0051] Among them, the upper plate vertical seismic isolation mechanism assembly 1 realizes quasi-zero stiffness vertical seismic isolation through the main and auxiliary spring structures, and the lower plate horizontal seismic isolation mechanism assembly 2 realizes horizontal seismic isolation through the guide rail slider mechanism and the spring; the upper plate vertical seismic isolation mechanism assembly 1 and the lower plate horizontal seismic isolation mechanism assembly 2 are locked and fixed by the upper and lower plate locking bolts 3; the magnetic bead seat 4 is installed at the edges of the upper plate vertical seismic isolation mechanism assembly 1 and the lower plate horizontal seismic isolation mechanism assembly 2, and the magnetic bead seat 4 absorbs the dust cover 5 through the built-in magnet for dust prevention; the heavy-duty corner pads 6 are installed at the four corners below the lower plate horizontal seismic isolation mechanism assembly 2.

[0052] Compared with the previous two-dimensional seismic isolation solutions, the above-mentioned solution of the present invention has lower cost.

[0053] The upper plate vertical seismic isolation assembly 1 and the lower plate horizontal seismic isolation assembly 2 share a middle plate.

[0054] like Figure 2 , 3 As shown, the upper plate vertical seismic isolation mechanism assembly 1 includes an upper plate 7, a middle plate 8, a main spring 9, a second upper support ear 15, a second lower support ear 16, a spring guide sleeve mechanism 17, an auxiliary spring 18, a connecting pin 19 and a hinge device.

[0055] A sleeve is provided at the center of the lower side of the upper plate 7, and a sleeve is provided at the center of the upper side of the middle plate 8. The upper plate 7 and the middle plate 8 are connected by the sleeve and the sleeve. When the cultural relics are placed on the seismic isolation platform, the relative distance between the upper plate and the middle plate becomes smaller due to the gravity of the cultural relics, and the sleeve and the sleeve slide relative to each other in the vertical direction. The sleeve is located outside the sleeve, so as to realize the guiding effect of the spring in the vertical direction. The main spring 9 is installed on the middle plate and located inside the sleeve.

[0056] Four auxiliary springs 18 are evenly distributed around the main spring 9 and the auxiliary springs 18 face the main spring 9; the auxiliary spring 18 is sleeved on a spring guide sleeve mechanism 17 for directional traction, and the spring guide sleeve mechanism 17 is composed of a sleeve and a sleeve, which controls the spring to expand and contract along the guide direction to prevent the system from becoming unstable; one end of the spring guide sleeve mechanism 17 is connected to a connecting pin 19 at the lower end of the second upper support ear 15, so that the spring guide sleeve mechanism 17 can rotate vertically around the connecting pin 19 at the lower end of the second upper support ear 15, and the upper end of the second upper support ear 15 is connected to the upper plate 7; the lower end of the second lower support ear 16 is fixed on the middle plate 8, and the other end of the spring guide sleeve mechanism 17 is connected to the connecting pin 19 at the upper end of the second lower support ear 15, so that the spring guide sleeve mechanism 17 can rotate vertically around the connecting pin 19 at the upper end of the second lower support ear 16, and the upper end of the second lower support ear 16 is connected to the middle plate 8; the four corners of the upper plate 7 and the middle plate 8 are connected by hinge devices to realize the adjustment of the angle and height of the vertical activity, and the four hinge devices are centrally symmetrically distributed.

[0057] Further, the hinge device includes a first upper lug 10, a first lower lug 11, an upper hinge 12, a lower hinge 13 and a hinge connecting bolt 14;

[0058] The first upper support ear 10 is fixed on the upper plate 7 and connected to one end of the upper hinge 12 through a pin shaft. The first lower support ear 11 is fixed on the middle plate 8 and connected to one end of the lower hinge 13 through a pin shaft. The other end of the upper hinge 12 is connected to the other end of the lower hinge 13 through a hinge connecting bolt 14.

[0059] like Figure 4 As shown, the quasi-zero stiffness vertical seismic isolation effect of the upper plate vertical seismic isolation mechanism assembly 1 is achieved through the cooperation of 1 main spring and 4 auxiliary springs.

[0060] After the sleeve is sleeve-connected, it serves as a vertical guide mechanism for the main spring 9.

[0061] The horizontal spring stiffness components of the four auxiliary springs are mutually balanced, and the vertical spring stiffness components are opposite to the main spring stiffness, so that the vertical spring stiffness components are mutually balanced with the main spring stiffness.

[0062] The hinge device realizes the adjustment of the vertical movable angle and height.

[0063] The spring stiffness between the main spring and the auxiliary spring is matched to achieve a quasi-zero stiffness design, such as Figure 4 As shown in Figure 2, the force balance and quasi-zero stiffness balance can be obtained according to the following formulas (1) and (2):

[0064] M×9.8=K m (L M0 -L M ) (1)

[0065]

[0066] In formula (1):

[0067] M is the mass of the weight on the vibration isolation platform;

[0068] L m0 is the original length of the main spring;

[0069] L m is the assembly length of the main spring;

[0070] K m is the stiffness of the main spring;

[0071] In formula (2):

[0072] K s is the stiffness of a single secondary spring;

[0073] L S0 is the original length of the secondary spring;

[0074] L s is the assembly length of the secondary spring;

[0075] ΔX is the compressed length of the main spring.

[0076] like Figure 5 , 6 As shown in , 7, the lower plate horizontal seismic isolation assembly 2 includes a lower plate 20, a well-shaped guide rail slider device 21, a guide rod fixed support 22, a guide rod 23, a tension and compression spring 24, a spring limit support 25, a limit baffle mechanism 26, and a buffer rubber pad 27;

[0077] The cross-shaped guide rail slider device 21 includes four cross sliders, two upper guide rails and two lower guide rails. The upper guide rails are fixedly connected to the middle plate 8 by bolts, and the lower guide rails are fixedly connected to the lower plate 20 by bolts. The upper and lower guide rails are connected by cross sliders, and the cross sliders are fixedly connected to the limit block mechanism 26 by bolts.

[0078] The tic-tac-toe guide rail slider device is an integral system that can be purchased directly, and the model is TRC30.

[0079] The upper and lower guide rods 23 are fixed to the middle plate 8 and the lower plate 20 respectively through the guide rod connecting support 22; a tension spring 24 is sleeved on the guide rod 23, one end of the tension spring 24 is connected to the guide rod connecting support 22, and the other end is connected to the spring limit support 25 on the cross-shaped guide rail slider device 21, and the spring limit support 25 is fixed on the cross slider;

[0080] The pulling of the guide rod 23 and the limiting of the spring limiting support 25 on the cross-shaped guide rail slider device 21 can realize the translation of the tension and compression spring 24 along the guide rail direction and the change of the spring length.

[0081] The upper and lower layers of guide rods 23 are also arranged in a tic-tac-toe shape. The pulling forces provided by the two tension-compression springs 24 of the upper layer are in opposite directions, and the pulling forces provided by the two tension-compression springs 24 of the lower layer are in opposite directions, thereby realizing horizontal seismic isolation.

[0082] like Figure 7 As shown, the buffer rubber pad 27 is respectively installed on the middle plate 8 and the lower plate 20. When the cross slider moves along the guide rail, the limit block mechanism 26 collides with the buffer rubber pad 27 to prevent it from being disengaged from the guide rail, thereby ensuring safety. The action stroke of the limit block mechanism 26 is less than the free stroke of the cross-shaped guide rail slider device 21, thereby ensuring the safety of the system and preventing derailment.

[0083] The design of the present invention has the following advantages:

[0084] In the device of the present invention, the upper plate and the middle plate are connected by a central vertical main spring and four diagonal oblique auxiliary springs. The main spring is connected to the guide tube on the middle plate through the guide tube on the central upper plate to achieve the guiding and stabilizing effect. The stiffness direction of the central main spring and the diagonal auxiliary spring is opposite, realizing the three-dimensional quasi-zero stiffness structural design, increasing the flexibility of the system, and its modal natural frequency approaches 0, achieving good nonlinear seismic isolation capability, while enhancing the vibration isolation rate in any direction of the vertical and its tangent.

[0085] At the same time, the four corners between the upper plate and the middle plate of the present invention adopt a hinge structure design that opens and closes up and down, which increases the torsional rigidity and vertical guidance. At the same time, it has strong vertical compression and pull-out resistance, reducing the possibility of damage to the upper system.

[0086] The middle plate and the lower plate of the present invention are connected by two layers of guide rail slider mechanisms in orthogonal directions, which play a role in horizontal guidance and preventing instability. The sliders slide back and forth along the guide rails to achieve translational movement in any horizontal direction. The upper and lower layers of four groups of spring mechanism units are connected to the guide rail slider mechanism to isolate vibrations in any horizontal direction.

[0087] When a rare strong earthquake occurs, the horizontal and vertical spring units work simultaneously, which can achieve broadband seismic isolation of the entire system in a three-dimensional vibration impact environment.

[0088] Parts of the present invention that are not described in detail belong to common knowledge among those skilled in the art.

Claims

1. A three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic isolation device, characterized by: It comprises an upper plate vertical seismic isolation mechanism assembly (1), a lower plate horizontal seismic isolation mechanism assembly (2), upper and lower plate locking bolts (3), a magnetic bead seat (4), a dust cover (5), and a heavy-duty floor corner pad (6); The upper plate vertical seismic isolation mechanism assembly (1) realizes quasi-zero stiffness vertical seismic isolation through a main and auxiliary spring structure, and the lower plate horizontal seismic isolation mechanism assembly (2) realizes horizontal seismic isolation through a guide rail slider mechanism in cooperation with a spring; the upper plate vertical seismic isolation mechanism assembly (1) and the lower plate horizontal seismic isolation mechanism assembly (2) are locked and fixed by upper and lower plate locking bolts (3); a magnetic bead seat (4) is installed at the edges of the upper plate vertical seismic isolation mechanism assembly (1) and the lower plate horizontal seismic isolation mechanism assembly (2), and the magnetic bead seat (4) absorbs the dust cover (5) through a built-in magnet for dust prevention; heavy-duty corner pads (6) are installed at the four corners below the lower plate horizontal seismic isolation mechanism assembly (2).

2. A three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to claim 1, characterized in that: The upper plate vertical seismic isolation mechanism assembly (1) comprises an upper plate (7), a middle plate (8), a main spring (9), a second upper support ear (15), a second lower support ear (16), a spring guide sleeve mechanism (17), an auxiliary spring (18), a connecting pin (19) and a hinge device; The central part of the lower side of the upper plate (7) is provided with a sleeve, the central part of the upper side of the middle plate (8) is provided with a sleeve, the upper plate (7) and the middle plate (8) are connected by the sleeve and the sleeve, when the cultural relic is placed on the seismic isolation platform, the relative distance between the upper plate and the middle plate becomes smaller due to the influence of the gravity of the cultural relic, and the sleeve and the sleeve slide relative to each other in the vertical direction, the sleeve is located outside the sleeve, and the spring guides in the vertical direction; the main spring (9) is installed on the middle plate and is located inside the sleeve; Four auxiliary springs (18) are evenly distributed around the main spring (9) and the auxiliary springs (18) face the main spring (9); the auxiliary spring (18) is sleeved on a spring guide sleeve mechanism (17) for directional traction, the spring guide sleeve mechanism (17) is composed of a sleeve and a sleeve, and controls the spring to expand and contract along the guide direction to prevent the system from becoming unstable; one end of the spring guide sleeve mechanism (17) is connected to a connecting pin (19) at the lower end of the second upper support ear (15), so that the spring guide sleeve mechanism (17) can rotate vertically around the connecting pin (19) at the lower end of the second upper support ear (15), and the second upper support ear (15) can rotate vertically. The upper end of the ear (15) is connected to the upper plate (7); the lower end of the second lower ear (16) is fixed on the middle plate (8); the other end of the spring guide sleeve mechanism (17) is connected to the connecting pin (19) at the upper end of the second lower ear (15), so that the spring guide sleeve mechanism (17) can rotate vertically around the connecting pin (19) at the upper end of the second lower ear (16); the upper end of the second lower ear (16) is connected to the middle plate (8); the four corners of the upper plate (7) and the middle plate (8) are connected by hinge devices to achieve the adjustment of the angle and height of the vertical activity, and the four hinge devices are distributed symmetrically around the center.

3. A three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to claim 2, characterized in that: The quasi-zero stiffness vertical seismic isolation effect of the upper plate vertical seismic isolation mechanism component (1) is achieved through the cooperation of one main spring and four auxiliary springs.

4. The three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to claim 2, characterized in that: After the sleeve is sleeve-connected, it serves as a vertical guide mechanism for the main spring (9).

5. The three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to claim 2, characterized in that: The horizontal spring stiffness components of the four auxiliary springs are mutually balanced, and the vertical spring stiffness components are opposite to the main spring stiffness, so that the vertical spring stiffness components are mutually balanced with the main spring stiffness.

6. The three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to claim 2, characterized in that: The hinge device comprises a first upper support ear (10) (connecting the upper hinge and the upper plate), a first lower support ear (11) (connecting the lower hinge and the middle plate), an upper hinge (12), a lower hinge (13) and a hinge connecting bolt (14); The first upper support ear (10) is fixed on the upper plate (7) and connected to one end of the upper hinge (12) through a pin shaft. The first lower support ear (11) is fixed on the middle plate (8) and connected to one end of the lower hinge (13) through a pin shaft. The other end of the upper hinge (12) is connected to the other end of the lower hinge (13) through a hinge connecting bolt (14).

7. A three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to any one of claims 2 to 6, characterized in that: The spring stiffness between the main spring and the auxiliary spring is matched to achieve a quasi-zero stiffness design. The force balance and the spatial quasi-zero stiffness balance of the main and auxiliary springs are obtained according to the following formulas (1) and (2): M×9.8=K m (L M0 -L M ) (1) in, M is the mass of the artifact on the vibration isolation device; L M0 is the original length of the main spring; L M is the assembly length of the main spring; K m is the stiffness of the main spring; K s is the stiffness of a single secondary spring; L S0 is the original length of the secondary spring; L s is the assembly length of the secondary spring; ΔX is the compressed length of the main spring.

8. The three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to claim 2, characterized in that: The lower plate horizontal seismic isolation assembly (2) comprises a lower plate (20), a well-shaped guide rail slider device (21), a guide rod fixing support (22), a guide rod (23), a tension and compression spring (24), a spring limit support (25), and a limit baffle mechanism (26); The cross-shaped guide rail slider device (21) comprises four cross sliders, two upper guide rails and two lower guide rails, the upper guide rails are fixedly connected to the middle plate (8) by bolts, the lower guide rails are fixedly connected to the lower plate (20) by bolts, the upper and lower guide rails are connected by cross sliders, and the cross sliders are fixedly connected to the limit stopper mechanism (26) by bolts; The upper and lower layers of guide rods (23) are respectively fixed on the middle plate (8) and the lower plate (20) through guide rod connecting supports (22); a tension and compression spring (24) is sleeved on the guide rod (23); one end of the tension and compression spring (24) is connected to the guide rod connecting support (22), and the other end is connected to a spring limit support (25) on the cross-shaped guide rail slider device (21); the spring limit support (25) is fixed on the cross slider; The pulling of the guide rod (23) and the limiting of the spring limiting support (25) on the cross-shaped guide rail slider device (21) can realize the translation of the tension and compression spring (24) along the guide rail direction and the change of the spring length.

9. The three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to claim 8, characterized in that: The upper and lower layers of guide rods (23) are also arranged in a tic-tac-toe shape. The pulling forces provided by the two tension and compression springs (24) of the upper layer are in opposite directions, and the pulling forces provided by the two tension and compression springs (24) of the lower layer are in opposite directions, thereby realizing horizontal vibration isolation.

10. The three-dimensional low-cost nonlinear quasi-zero stiffness cultural relic seismic isolation device according to claim 8, characterized in that: It also includes a buffer rubber pad (27) which is respectively mounted on the middle plate (8) and the lower plate (20). When the cross slide moves in a direction along the guide rail, the limit stopper mechanism (26) collides with the buffer rubber pad (27) to prevent it from falling off the guide rail, thereby ensuring safety.

Images