Shock isolation device for museum collection cultural relic showcase and shock isolation method of shock isolation device

Abstract

The invention discloses a shock isolation device for a museum collection cultural relic showcase and a shock isolation method of the shock isolation device. The two horizontal shock isolation units which are perpendicular to each other are adopted, and multi-stage buffering shock isolation in the two horizontal directions is achieved; the upper horizontal shock isolation unit and the lower horizontal shock isolation unit are completely identical in structure part, the structure is simple, machining and assembling are convenient, and the buffering shock isolation function of the product can be achieved after the two identical horizontal shock isolation units are machined and completed to be in butt joint. According to the non-linear elastic device, variable stiffness can be achieved through the geometrical relationship by means of the linear springs, the manufacturing cost of the non-linear elastic device is reduced, and the shock isolation effect is greatly improved; the anti-seismic property of the showcase is optimized, so that the showcase can provide an efficient and stable anti-seismic protection scheme in various vibration environments, and the universality and adaptability of the showcase are improved while the safety of cultural relics is ensured; the horizontal two-way seismic isolation capacity is particularly suitable for coping with complex seismic fluctuations, especially the situation that the seismic intensity is large or multiple times of vibration are caused.

Description

Technical Field

[0001] The present invention relates to seismic isolation for display cabinets of cultural relics in a collection, and particularly to a seismic isolation device and a seismic isolation method for display cabinets of cultural relics in a collection. Background Art

[0002] As precious carriers of historical culture, cultural relics carry the civilization inheritance of a country and a nation, are important manifestations of historical accumulation and spiritual outlook, and have irreplaceable value in the construction of material civilization and spiritual civilization. Under the action of an earthquake, the seismic performance of a display cabinet for cultural relics directly affects the safety state of the cultural relics. Currently, steel display cabinets are commonly used in museums. Such display cabinets are usually directly placed on the ground and have characteristics such as a relatively large aspect ratio of length to width and height to width, a relatively high self-weight, and a significant natural frequency. When an earthquake occurs, the display cabinet is prone to overall overturning, sliding, high-frequency vibration, and structural torsional deformation and other damage phenomena. Therefore, there is an urgent engineering need to achieve effective seismic isolation for display cabinets of cultural relics.

[0003] Although various solutions have been formed in the field of cultural relics protection for current seismic isolation technologies, their application effectiveness still has significant limitations. The design and verification of existing devices are mostly based on specific categories or fixed forms of cultural relics, and it is difficult to cover the diverse needs of floating cultural relics such as bronzes, pottery, and porcelain in actual collections. Such cultural relics not only have significant morphological differences, but their size changes and center of gravity distribution characteristics will also have unknown effects on the seismic isolation system. Especially when the exhibit types are switched or combined for exhibition layout, whether the existing earthquake prevention measures can maintain stable earthquake prevention performance still has technical blind spots. Therefore, developing a general-purpose seismic isolation device with multiple adaptability capabilities to achieve compatible protection of cultural relics of multiple scales and forms has become a key topic in seismic protection of cultural relics in a collection. Summary of the Invention

[0004] Aiming at the problems existing in the above prior art, the present invention proposes a seismic isolation device and a seismic isolation method for display cabinets of cultural relics in a collection to enhance the applicability of the display cabinet to various cultural relics and meet the earthquake prevention requirements of various cultural relics.

[0005] An object of the present invention is to propose a seismic isolation device for display cabinets of cultural relics in a collection.

[0006] The seismic isolation device for display cabinets of cultural relics in the present invention includes: a first horizontal seismic isolation unit and a second horizontal seismic isolation unit; the first horizontal seismic isolation unit is installed on the second horizontal seismic isolation unit, and the display cabinet of cultural relics in a collection is placed on the first horizontal seismic isolation unit;

[0007] Each horizontal seismic isolation unit includes: a base plate, slide rails, winged sliders, support tubes, first to Nth springs, and side plates; wherein, the base plate is located on a horizontal plane; side plates perpendicular to the base plate are provided at the edges of the base plate; multiple slide rails are fixedly installed on the surface of the base plate, and the multiple slide rails are parallel to each other and symmetric about the central axis; a winged slider is installed on each slide rail, and the winged slider can move along the direction of the slide rail; each winged slider includes an intermediate block and wing flanks connected as a whole, the intermediate block is installed on the slide rail, wing flanks are symmetrically arranged on both sides of the intermediate block respectively, and the surface of the wing flanks is perpendicular to the slide rail; N support tubes are symmetrically arranged on both sides of each slide rail respectively, the support tubes are parallel to the slide rail, N through holes are respectively formed on each wing flank corresponding to the support tubes, the diameter of the through holes is not less than the outer diameter of the support tubes, the support tubes pass through the wing flanks through the corresponding through holes, and both ends of the support tubes are respectively fixed on a pair of opposite side plates, and the intermediate block capable of moving along the slide rail drives the wing flanks on both sides to move along the support tubes; a spring is symmetrically arranged on each support tube and on both sides of the wing flank respectively, the spring is sleeved outside the support tube, one end of the spring close to the side plate is fixed on the side plate, and one end of the spring close to the wing flank is free; the first to Nth springs are arranged in sequence from the inside to the outside with the slide rail as the center, the lengths and stiffnesses of the first to Nth springs are different, the closer the spring is to the slide rail, the longer its length, that is, the first spring is the longest and the Nth spring is the shortest, the free length of the first spring is greater than 1 / 2 of the distance between two opposite side plates parallel to each other, at rest, the free end of the spring abuts against the surface of the wing flank, and the free length of the Nth spring is less than 1 / 2 of the distance between two opposite side plates parallel to each other, and there is a distance between the free end of the spring and the surface of the wing flank at rest; the closer the spring is to the slide rail, the greater its stiffness, that is, the first spring has the greatest stiffness and the Nth spring has the smallest stiffness;

[0008] The slide rails of the first horizontal seismic isolation unit are parallel to the first horizontal direction, the slide rails of the second horizontal seismic isolation unit are parallel to the second horizontal direction, both the first horizontal direction and the second horizontal direction are located in the horizontal plane and perpendicular to each other; the lower surface of the base plate of the first horizontal seismic isolation unit is fixedly installed on the slider of the second horizontal seismic isolation unit;

[0009] When subjected to earthquake action, the first horizontal-direction earthquake force in the earthquake action is buffered and isolated by the first horizontal-direction isolation unit. The slider in the first horizontal-direction isolation unit moves along the slide rail, causing the first horizontal-direction isolation unit to move in the first horizontal direction arranged along the slide rail. The first spring starts to compress, converting the earthquake force in the first horizontal direction into the elastic force of the longest spring, achieving the primary buffering and isolation of the earthquake force in the first horizontal direction for the display cabinet of cultural relics in the collection. When the first spring is compressed to the free length of the second spring, the second spring starts to compress, converting the earthquake force in the first horizontal direction into the elastic force of the spring to provide buffering and isolation. And so on, the springs are sequentially compressed level by level according to the length of the springs for multi-stage buffering. Moreover, the first spring has the largest stiffness, providing the strongest supporting force when the displacement of the isolation device increases, preventing excessive deformation of the system and ensuring stability. The second to the Nth springs sequentially provide gradually softer buffering, playing the role of multi-stage isolation, making the overall force of the system smoother, reducing the earthquake action on the cultural relics, and gradually absorbing the earthquake energy by springs with different stiffness levels to reduce the impact peak. The first to the Nth springs with different lengths and stiffnesses in the first horizontal-direction isolation unit achieve multi-stage buffering and isolation of the display cabinet of cultural relics in the collection in the first horizontal direction. Similarly, the second horizontal-direction earthquake force in the earthquake action is buffered and isolated by the second horizontal-direction isolation unit. The first to the Nth springs with different lengths and stiffnesses in the second horizontal-direction isolation unit achieve multi-stage buffering and isolation of the display cabinet of cultural relics in the collection in the second horizontal direction.

[0010] Furthermore, during the sliding process of the slider along the slide rail direction, it will be jointly affected by the frictional force in the slide rail direction and the frictional force between the spring and the support pipe. These two frictional forces play the role of absorbing earthquake energy. Among them, different springs have different stiffnesses, and at the same time play the function of variable stiffness, which is beneficial to the startup of the isolation device and better absorption of earthquake energy. The sequential spring stiffness distribution enhances the stability of the display cabinet of cultural relics in the collection, preventing the structure from shaking violently or losing stability under earthquake action and ensuring the safety of cultural relics. The hierarchical compression of springs with different stiffnesses can also improve the adaptability of the display cabinet of cultural relics in the collection to different types of seismic waves. The springs near the slide rail side effectively suppress high-frequency vibrations, and the springs far from the slide rail side buffer long-period vibrations, improving the overall seismic performance. Moreover, the multi-stage spring arrangement method enhances the self-resetting ability of the display cabinet of cultural relics in the collection. The springs near the slide rail side provide a strong restoring force, enabling the display cabinet of cultural relics in the collection to quickly return to a stable state, while the gradual restoration of the springs far from the slide rail side can reduce the post-earthquake adjustment time and avoid secondary impacts.

[0011] The base plate and the side plate need to meet sufficient stiffness requirements to ensure the stability of the display cabinet of cultural relics in the collection and the cultural relics during an earthquake. As the bottom support structure, it needs to have a high stiffness to bear the weight of the display cabinet of cultural relics in the collection and the cultural relics, and reduce excessive deformation under earthquake action. Its stiffness range is 10 6 ~10 8N / m, and the materials include stainless steel, carbon steel, aluminum alloy, engineering plastics or rubber; the thickness of the base plate is 3 - 10 mm, and the height of the side plate is 2 - 8 cm.

[0012] The materials of the slide rail, the winged slider and the support tube are stainless steel, bearing steel, aluminum alloy, copper alloy, polytetrafluoroethylene, polyoxymethylene or carbon fiber composite material. The cross-sectional shape of the support tube is circular.

[0013] The spring adopts a linear compression spring, and the stiffness is changed by the linear spring. The free length of the Nth spring is 1 / 4 - 4 / 5 of that of the first spring; N is a natural number greater than or equal to 2, and 2 ≤ N ≤ 5.

[0014] Another object of the present invention is to propose a seismic isolation method for a display cabinet of cultural relics in a collection.

[0015] The seismic isolation method for a display cabinet of cultural relics in the present invention includes the following steps:

[0016] 1) Setting of the seismic isolation device:

[0017] The slide rail of the first horizontal seismic isolation unit is parallel to the first horizontal direction, the slide rail of the second horizontal seismic isolation unit is parallel to the second horizontal direction, the first horizontal direction and the second horizontal direction are in the horizontal plane and perpendicular to each other; the lower surface of the base plate of the first horizontal seismic isolation unit is fixedly installed on the slider of the second horizontal seismic isolation unit;

[0018] 2) Multi-stage buffer seismic isolation:

[0019] When subjected to earthquake action, the first horizontal direction force in the earthquake action force is buffered and isolated by the first horizontal seismic isolation unit. The slider in the first horizontal seismic isolation unit moves along the slide rail, so that the first horizontal seismic isolation unit moves in the first horizontal direction arranged along the slide rail, and the first spring starts to compress, converting the earthquake action force in the first horizontal direction into the elastic force of the longest spring, realizing the primary buffer seismic isolation of the earthquake action force in the first horizontal direction of the display cabinet of cultural relics in the collection. When the first spring is compressed to the free length of the second spring, the second spring starts to compress, converting the earthquake action force in the first horizontal direction into the elastic force of the spring, providing buffer seismic isolation, and so on, successively compressing the springs step by step according to the length of the springs, for multi-stage buffering;

[0020] Moreover, the first spring has the largest stiffness, providing the strongest supporting force when the displacement of the seismic isolation device increases, preventing the system from undergoing excessive deformation and ensuring stability; the second to the Nth springs successively provide gradually softer buffering, playing the role of multiple seismic isolations, making the overall force of the system smoother, reducing the earthquake action received by the cultural relics, and the earthquake energy is gradually absorbed by springs with different stiffness levels in a hierarchical manner, reducing the impact peak value; the first to the Nth springs with different lengths and stiffnesses in the first horizontal seismic isolation unit realize the multi-stage buffer seismic isolation of the display cabinet of cultural relics in the collection in the first horizontal direction;

[0021] Similarly, the second horizontal direction force in the seismic force is buffered and isolated by the second horizontal isolation unit.

[0022] The first to Nth stage springs with different lengths and stiffnesses of the second horizontal isolation unit achieve multi-stage buffering and isolation of the second horizontal direction of the display cabinet for cultural relics in the collection.

[0023] 3) Energy absorption:

[0024] During the process of the slider sliding along the direction of the slide rail, it will be jointly affected by the frictional force in the direction of the slide rail and the frictional force between the spring and the support tube. These two frictional forces play a role in absorbing seismic energy. Among them, different springs have different stiffnesses, and at the same time play a variable stiffness function, which is beneficial to the start-up of the isolation device and better absorption of seismic energy; the step-by-step spring stiffness distribution enhances the stability of the display cabinet for cultural relics in the collection, prevents the structure from shaking violently or losing stability under seismic action, and ensures the safety of cultural relics; the hierarchical compression of springs with different stiffnesses can also improve the adaptability of the display cabinet for cultural relics in the collection to different types of seismic waves. The springs near the slide rail side effectively suppress high-frequency vibrations, and the springs far from the slide rail side buffer long-period vibrations, improving the overall seismic resistance performance.

[0025] 4) Self-resetting:

[0026] The multi-stage spring arrangement method enhances the self-resetting ability of the display cabinet for cultural relics in the collection. The springs near the slide rail side provide a strong restoring force, enabling the display cabinet for cultural relics in the collection to quickly return to a stable state, while the gradual restoration of the springs far from the slide rail side can reduce the post-earthquake adjustment time and avoid secondary impacts.

[0027] Among them, in step 3), for the vibrations in the horizontal direction, they first act on the second horizontal isolation unit. The slider of the second horizontal isolation unit will be driven by the seismic force and generate a relative movement along the second horizontal direction; the horizontal displacement of the second horizontal slider will drive the first horizontal isolation unit to move together along the second horizontal direction; through this coupling effect, the first horizontal isolation unit can respond to the displacement of the second horizontal isolation unit, further reducing the propagation of earthquakes; under the combined action of these horizontal two-way isolation units, the linkage response of the first horizontal isolation unit and the second horizontal isolation unit effectively slows down the direct impact of seismic waves on cultural relics; the first horizontal isolation unit can make an adaptive displacement according to the movement of the second horizontal isolation unit, the seismic energy is effectively dispersed and alleviated, reducing the impact of seismic waves on cultural relics and lowering the risk of cultural relic damage caused by earthquakes; by playing an isolation role simultaneously in two horizontal directions, the vibrations caused by seismic action in different horizontal directions will be respectively alleviated through the coupling effect of the two units, thus achieving comprehensive isolation and buffering of horizontal ground motion.

[0028] Advantages of the present invention:

[0029] In the seismic isolation device of the present invention, the upper and lower horizontal seismic isolation unit structures are completely the same, which reduces the processing difficulty. Only two identical horizontal seismic isolation units need to be processed and completed, and the buffer and seismic isolation function of the product can be realized after docking; the structure of the present invention is simple, convenient for processing and assembly, can realize variable stiffness through geometric relations by using linear springs, reduces the manufacturing cost of non-linear elastic devices, and greatly improves the seismic isolation effect; the present invention optimizes the seismic characteristics of the display cabinet, enables it to provide an efficient and stable earthquake protection solution in a variety of vibration environments, and improves the versatility and adaptability of the display cabinet while ensuring the safety of cultural relics; the horizontal bi-directional seismic isolation ability of the present invention is particularly suitable for dealing with complex seismic waves, especially in the case of large earthquake intensity or multiple vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a sectional view along the first direction of an embodiment of the seismic isolation device for a display cabinet of cultural relics in the collection of the present invention;

[0031] Figure 2 It is a sectional view along the second direction of an embodiment of the seismic isolation device for a display cabinet of cultural relics in the collection of the present invention;

[0032] Figure 3 It is a three-dimensional schematic diagram of an embodiment of the seismic isolation device for a display cabinet of cultural relics in the collection of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present invention will be further described below with reference to the drawings and specific embodiments.

[0034] As Figures 1 to 3 shown, the seismic isolation device for a display cabinet of cultural relics in this embodiment includes: a first horizontal seismic isolation unit and a second horizontal seismic isolation unit; the first horizontal seismic isolation unit is installed on the second horizontal seismic isolation unit, and the display cabinet of cultural relics in the collection is placed on the first horizontal seismic isolation unit;

[0035] Each horizontal seismic isolation unit includes: a base plate 11, slide rails 12, winged sliders 13, support tubes 14, first springs 15, second springs 16, and side plates 17; among them, the base plate 11 is located on the horizontal plane; side plates 17 perpendicular to the base plate 11 are provided at the edges of the base plate 11; multiple slide rails 12 are fixedly installed on the surface of the base plate 11, and the multiple slide rails 12 are parallel to each other and symmetric about the central axis; a winged slider 13 is installed on each slide rail 12, and the winged slider 13 can move along the direction of the slide rail 12; each winged slider 13 includes an intermediate block and side wings connected as a whole, the intermediate block is installed on the slide rail 12, side wings are symmetrically arranged on both sides of the intermediate block respectively, and the surface of the side wings is perpendicular to the slide rail 12; two support tubes 14 are symmetrically arranged on both sides of each slide rail 12 respectively, the support tubes 14 are parallel to the slide rail 12, two through holes are respectively formed on each side wing corresponding to the support tubes 14, the diameter of the through holes is not less than the outer diameter of the support tubes 14, the support tubes 14 pass through the side wings through the corresponding through holes, and both ends of the support tubes 14 are respectively fixed on a pair of opposite side plates 17, and the intermediate block capable of moving along the slide rail 12 drives the side wings on both sides to move along the support tubes 14; a spring is symmetrically arranged on each support tube 14 and on both sides of the side wing, the spring is sleeved outside the support tube 14, one end of the spring close to the side plate 17 is fixed on the side plate 17, and one end of the spring close to the side wing is free; the first and second springs 16 are arranged in sequence from the inside to the outside with the slide rail 12 as the center, the lengths and stiffnesses of the first and second springs 16 are different, the first spring 15 is longer than the second spring 16, the free length of the first spring 15 is greater than 1 / 2 of the distance between two opposite side plates 17 that are parallel to each other, the free end of the spring abuts against the surface of the side wing when at rest, and the free length of the second spring 16 is less than 1 / 2 of the distance between two opposite side plates 17 that are parallel to each other, and there is a distance between the free end of the spring and the surface of the side wing when at rest; the free length of the second spring 16 is 2 / 3 of that of the first spring 15.

[0036] The slide rails 12 of the first horizontal seismic isolation unit are parallel to the first horizontal direction, the slide rails 12 of the second horizontal seismic isolation unit are parallel to the second horizontal direction, the first horizontal direction and the second horizontal direction are located in the horizontal plane and perpendicular to each other; the lower surface of the base plate 11 of the first horizontal seismic isolation unit is fixedly installed on the slider of the second horizontal seismic isolation unit;

[0037] When subjected to earthquake action, the first horizontal direction force in the earthquake action force is buffered and isolated by the first horizontal isolation unit. The slider in the first horizontal isolation unit moves along the slide rail 12, causing the first horizontal isolation unit to move in the first horizontal direction arranged along the slide rail 12. The first spring 15 starts to compress, converting the earthquake action force in the first horizontal direction into the elastic force of the longest spring, realizing the primary buffering and isolation of the earthquake action force in the first horizontal direction of the cultural relic display cabinet. When the first spring 15 is compressed to the free length of the second spring 16, the second spring 16 starts to compress, converting the earthquake action force in the first horizontal direction into the elastic force of the spring to provide buffering and isolation. The springs are compressed step by step in sequence according to the length of the springs for multi-stage buffering. Moreover, the first spring 15 has the largest stiffness, providing the strongest supporting force when the displacement of the isolation device increases, preventing the system from undergoing excessive deformation and ensuring stability. The second spring 16 provides a gradually gentle buffer, playing the role of multiple isolations, making the overall force of the system smoother, reducing the earthquake action received by the cultural relics, and gradually absorbing the earthquake energy by springs with different stiffness levels in a hierarchical manner to reduce the impact peak. The first and second stage springs with different lengths and stiffnesses in the first horizontal isolation unit realize the multi-stage buffering and isolation of the cultural relic display cabinet in the first horizontal direction. Similarly, the second horizontal direction force in the earthquake action force is buffered and isolated by the second horizontal isolation unit. The first and second stage springs with different lengths and stiffnesses in the second horizontal isolation unit realize the multi-stage buffering and isolation of the cultural relic display cabinet in the second horizontal direction.

[0038] The lower surface of the substrate 11 of the first horizontal seismic isolation unit is fixedly installed on the slider of the second horizontal seismic isolation unit, forming a horizontal two-way seismic isolation system; under the action of an earthquake, the slider of the second horizontal seismic isolation unit generates relative movement in the horizontal direction, and this movement drives the entire first horizontal seismic isolation unit to move along the second direction; the result of this combined action is that it can effectively isolate and buffer seismic vibrations in the horizontal direction, thereby reducing the transmission of seismic energy to the cultural relics and achieving the protection purpose; when seismic waves propagate to a building or a display cabinet, especially the vibrations in the horizontal direction, they will first act on the second horizontal seismic isolation unit, and the slider of the second horizontal seismic isolation unit will be driven by the seismic force and generate relative movement along the second horizontal direction; since the lower surface of the substrate 11 of the first horizontal seismic isolation unit is connected to the slider of the second horizontal seismic isolation unit, the horizontal displacement of the second horizontal slider will drive the first horizontal seismic isolation unit to move together along the second horizontal direction; through this coupling effect, the first horizontal seismic isolation unit can respond to the displacement of the second horizontal seismic isolation unit and further reduce the propagation of the earthquake; under the combined action of this horizontal two-way seismic isolation unit, the linkage response between the first horizontal seismic isolation unit and the second horizontal seismic isolation unit effectively reduces the direct impact of seismic waves on the cultural relics; since the first horizontal seismic isolation unit can adaptively displace according to the movement of the second horizontal seismic isolation unit, seismic energy is effectively dispersed and alleviated, reducing the impact of seismic waves on the cultural relics and lowering the risk of damage to the cultural relics caused by the earthquake; this system can play a seismic isolation role in both horizontal directions simultaneously; the vibrations induced by the earthquake in different horizontal directions will be alleviated respectively through the coupling effect of the two horizontal seismic isolation units, thereby achieving comprehensive isolation and buffering of the horizontal ground motion; this horizontal two-way seismic isolation ability is particularly suitable for dealing with complex seismic waves, especially in the case of a large earthquake intensity or multiple vibrations.

[0039] Furthermore, during the sliding process of the slider along the direction of the slide rail 12, it will be jointly affected by the frictional force in the direction of the slide rail 12 and the frictional force between the spring and the support tube 14. These two frictional forces play a role in absorbing seismic energy. Among them, different springs have different stiffnesses, and at the same time, they play a variable stiffness function, which is beneficial to the startup of the seismic isolation device and better absorption of seismic energy; the gradual spring stiffness distribution enhances the stability of the display cabinet, preventing the structure from shaking violently or losing stability under the action of an earthquake and ensuring the safety of the cultural relics; the graded compression of springs with different stiffnesses can also improve the adaptability of the display cabinet to different types of seismic waves. The first spring 15 near the slide rail 12 effectively suppresses high-frequency vibrations, and the second spring 16 far from the slide rail 12 buffers long-period vibrations, improving the overall seismic performance; moreover, the multi-stage spring arrangement can also enhance the self-resetting ability of the display cabinet. The first spring 15 near the slide rail 12 provides a strong restoring force, enabling the display cabinet to quickly return to a stable state, while the gradual restoration of the second spring 16 far from the slide rail 12 can reduce the post-earthquake adjustment time and avoid secondary impacts.

[0040] In this embodiment, the dimensions and material models of each structure are shown in the following table:

[0041]

[0042] Finally, it should be noted that the purpose of disclosing the embodiments is to help further understand the present invention. However, those skilled in the art can understand that various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the content disclosed in the embodiments, and the scope of protection claimed by the present invention shall be subject to the scope defined by the claims.

Claims

1. An anti-seismic device for a display cabinet of a museum collection, characterized in that, The seismic isolation device for the display cabinet of cultural relics in the collection includes: a first horizontal seismic isolation unit and a second horizontal seismic isolation unit; the first horizontal seismic isolation unit is installed on the second horizontal seismic isolation unit, and the display cabinet of cultural relics in the collection is placed on the first horizontal seismic isolation unit; Each horizontal seismic isolation unit includes: a base plate, a slide rail, a slider with wings, a support tube, the first to the Nth springs, and side plates; wherein, the base plate is located in the horizontal plane; side plates perpendicular to the base plate are provided at the edges of the base plate; a plurality of slide rails are fixedly installed on the surface of the base plate, and the plurality of slide rails are parallel to each other and symmetrical about the center axis; a slider with wings is installed on each slide rail, and the slider with wings can move along the direction of the slide rail; each slider with wings includes a middle block and side wings connected as a whole, the middle block is installed on the slide rail, side wings are symmetrically arranged on both sides of the middle block respectively, and the surface of the side wings is perpendicular to the slide rail; N support tubes are symmetrically arranged on both sides of each slide rail respectively, the support tubes are parallel to the slide rail, and N through holes are respectively opened on each side wing corresponding to the support tubes, the diameter of the through holes is not less than the outer diameter of the support tubes, the support tubes pass through the side wings through the corresponding through holes, and both ends of the support tubes are fixedly connected to a pair of opposite side plates, and the middle block that can move along the slide rail drives the side wings on both sides to move along the support tubes; a spring is symmetrically arranged on each support tube and on both sides of the side wing respectively, the spring is sleeved outside the support tube, the end of the spring close to the side plate is fixed on the side plate, and the end of the spring close to the side wing is free; the first to the Nth springs are arranged in sequence from the inside to the outside with the slide rail as the center, the lengths and stiffnesses of the first to the Nth springs are different, the closer to the slide rail, the longer the spring is, that is, the first spring is the longest and the Nth spring is the shortest, the free length of the first spring is greater than 1 / 2 of the distance between two opposite side plates parallel to each other, when at rest, the free end of the spring abuts against the surface of the side wing, and the free length of the Nth spring is less than 1 / 2 of the distance between two opposite side plates parallel to each other, when at rest, there is a distance between the free end of the spring and the surface of the side wing; the closer to the slide rail, the greater the stiffness of the spring is, that is, the first spring has the greatest stiffness and the Nth spring has the smallest stiffness; The slide rails of the first horizontal seismic isolation unit are parallel to the first horizontal direction, the slide rails of the second horizontal seismic isolation unit are parallel to the second horizontal direction, the first horizontal direction and the second horizontal direction are both located in the horizontal plane and perpendicular to each other; the lower surface of the base plate of the first horizontal seismic isolation unit is fixedly installed on the slider of the second horizontal seismic isolation unit.

2. The shock isolation device for the display cabinet of the collection of cultural relics according to claim 1, characterized in that, The stiffness range of the substrate and the side plate is 10 6 to 10 8 N / m.

3. The shock isolation device for the display cabinet of the collection of cultural relics according to claim 1, characterized in that, The materials of the base plate and the side plates include stainless steel, carbon steel, aluminum alloy, engineering plastic or rubber.

4. The shock isolation device for the display cabinet of the collection of cultural relics according to claim 1, wherein, The thickness of the base plate is 3 to 10 mm, and the height of the side plates is 2 to 8 cm.

5. The shock isolation device for the display cabinet of the museum collection cultural relics according to claim 1, characterized in that, The materials of the slide rails, the sliders with wings and the support tubes are made of stainless steel, bearing steel, aluminum alloy, copper alloy, polytetrafluoroethylene, polyoxymethylene or carbon fiber composite material.

6. The shock isolation device for the display cabinet of the collection of cultural relics according to claim 1, characterized in that, The cross-sectional shape of the support tube is circular.

7. The seismic isolation device for the display cabinet of the museum collection as described in claim 1, characterized in that, The spring adopts a linear compression spring.

8. The seismic isolation device for the display cabinet of the museum collection as described in claim 1, characterized in that, The free length of the Nth spring is 1 / 4 to 4 / 5 of that of the first spring.

9. A seismic isolation method for the seismic isolation device of the display cabinet for cultural relics in the collection as described in claim 1, characterized in that, The seismic isolation method includes the following steps: 1) Seismic isolation device setting: The slide rails of the first horizontal seismic isolation unit are parallel to the first horizontal direction, and the slide rails of the second horizontal seismic isolation unit are parallel to the second horizontal direction. The first horizontal direction and the second horizontal direction are located in the horizontal plane and perpendicular to each other. The lower surface of the base plate of the first horizontal seismic isolation unit is fixedly installed on the slider of the second horizontal seismic isolation unit. 2) Multi-stage buffer seismic isolation: When an earthquake occurs, the first horizontal direction force in the earthquake force is buffered and isolated by the first horizontal seismic isolation unit. The slider in the first horizontal seismic isolation unit moves along the slide rail, causing the first horizontal seismic isolation unit to move in the first horizontal direction arranged along the slide rail. The first spring starts to compress, converting the earthquake force in the first horizontal direction into the elastic force of the longest spring, achieving the primary buffer seismic isolation of the earthquake force in the first horizontal direction for the display cabinet of cultural relics in the collection. When the first spring is compressed to the free length of the second spring, the second spring starts to compress, converting the earthquake force in the first horizontal direction into the elastic force of the spring, providing buffer seismic isolation, and so on, compressing the springs successively in order of the spring length, for multi-stage buffering; Moreover, the first spring has the largest stiffness, providing the strongest supporting force when the displacement of the seismic isolation device increases, preventing excessive deformation of the system and ensuring stability; the second to the Nth springs provide gradually softer buffering in turn, playing the role of multiple seismic isolations, making the overall force of the system smoother, reducing the earthquake action on the cultural relics, and gradually absorbing the earthquake energy by springs with different stiffness levels in a graded manner, reducing the impact peak; the first to the Nth springs with different lengths and stiffnesses in the first horizontal seismic isolation unit achieve multi-stage buffer seismic isolation of the display cabinet of cultural relics in the collection in the first horizontal direction; Similarly, the second horizontal direction force in the earthquake force is buffered and isolated by the second horizontal seismic isolation unit. The first to the Nth springs with different lengths and stiffnesses in the second horizontal seismic isolation unit achieve multi-stage buffer seismic isolation of the display cabinet of cultural relics in the collection in the second horizontal direction; 3) Energy absorption: During the process of the slider sliding along the slide rail direction, it is jointly affected by the frictional force in the slide rail direction and the frictional force between the spring and the support tube. These two frictional forces play the role of absorbing earthquake energy. Among them, different springs have different stiffnesses, and at the same time play the function of variable stiffness, which is beneficial to the startup of the seismic isolation device and better absorption of earthquake energy; the graded spring stiffness distribution enhances the stability of the display cabinet of cultural relics in the collection, preventing the structure from shaking violently or losing stability under earthquake action and ensuring the safety of cultural relics; the graded compression of springs with different stiffnesses can also improve the adaptability of the display cabinet of cultural relics in the collection to different types of seismic waves. The springs close to the slide rail side effectively suppress high-frequency vibrations, and the springs far from the slide rail side buffer long-period vibrations, improving the overall seismic performance; 4) Self-resetting: The multi-stage spring arrangement method enhances the self-resetting ability of the display cabinet of cultural relics in the collection. The springs close to the slide rail side provide a strong restoring force, enabling the display cabinet of cultural relics in the collection to quickly return to a stable state, while the gradual restoration of the springs far from the slide rail side can reduce the post-earthquake adjustment time and avoid secondary impacts.

10. The seismic isolation method according to claim 9, characterized in that, In step 3), for the vibration in the horizontal direction, it first acts on the second horizontal isolation unit. The slider of the second horizontal isolation unit will be driven by the seismic force and generate relative movement along the second horizontal direction. The horizontal displacement of the second horizontal slider will drive the first horizontal isolation unit to move together along the second horizontal direction. Through this coupling effect, the first horizontal isolation unit can respond to the displacement of the second horizontal isolation unit, further reducing the propagation of the earthquake. Under the combined action of these horizontal two-way isolation units, the linkage response between the first horizontal isolation unit and the second horizontal isolation unit effectively reduces the direct impact of seismic waves on the cultural relics. The first horizontal isolation unit can make adaptive displacement according to the movement of the second horizontal isolation unit, and the seismic energy is effectively dispersed and alleviated, reducing the impact of seismic waves on the cultural relics and lowering the risk of damage to cultural relics caused by earthquakes. By playing the isolation role simultaneously in two horizontal directions, the vibrations caused by the earthquake in different horizontal directions will be alleviated respectively through the coupling effect of the two horizontal isolation units, thus achieving the comprehensive isolation and buffering of the ground motion in the horizontal direction.

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