Building high-damping magneto-rheological shock isolation device and method

Abstract

The invention relates to the technical field of seismic mitigation and isolation, and discloses a building high-damping magneto-rheological seismic isolation device which comprises a bottom plate, a vertical seat, a main plate and a reset column, through grooves are formed in the two sides of the upper surface of the bottom plate, and two sleeve blocks are slidably clamped in the through grooves. According to the high-damping magneto-rheological shock insulation device for the building, the rigidity and damping of the shock insulation support are controlled by changing the size of a magnetic field, the resonance phenomenon is effectively avoided, meanwhile, when a sliding block moves downwards, a third gear is driven to rotate, meanwhile, the third gear can drive a second gear to rotate, and therefore the shock insulation effect is improved. When a sliding block moves, a rack can carry a sleeve block to synchronously move, a reset spring is driven to stretch, the pulling force of the reset spring is applied to the sleeve block, the rack is driven to move, and a multi-buffering and damping mechanism and multi-stage buffering and damping are achieved. And the vibration can be counteracted through the reset spring and the first magneto-rheological damper, so that different types of vibration are adapted, and the vibration isolation effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction and isolation, and in particular to a high-damping magnetorheological vibration isolation device and method for a building. Background Art

[0002] In existing earthquake-resistant building facilities, an isolation device is set at the base or a certain position of the building to form an isolation layer, isolating the upper structure from the lower foundation, so as to consume earthquake energy and avoid or reduce the transmission of earthquake energy to the upper part, which can more effectively ensure the safety of the upper structure and internal personnel and equipment. High-damping laminated rubber is commonly used. The advantages of this technology are its simple design, long-lasting function, strong resistance to external pressure, and through the design of laminated rubber, it can effectively prevent its volume expansion when subjected to external pressure, thereby improving its stability.

[0003] Although rubber materials have the following problems: low vertical stiffness, inability to adjust damping force, insufficient stability under horizontal loads, high sensitivity to temperature changes, poor durability, and ineffective energy dissipation and vibration reduction for low-frequency civil structures. These problems may cause resonance in isolation facilities under the influence of long-term earthquakes, which in turn may cause their own destruction. Fortunately, magnetorheological dampers have good adjustable and energy dissipation and vibration reduction performance, and show good vibration reduction effects for high, medium, and low frequency structures. However, current magnetorheological dampers do not yet have multi-dimensional vibration reduction capabilities and do not have automatic reset functions. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a high-damping magnetorheological seismic isolation device and method for buildings, which has high vertical stiffness, adjustable damping force, high stability under horizontal load, low sensitivity to temperature changes, good durability, and has the advantages of multi-dimensional shock absorption and automatic reset, thereby solving the problems raised in the background technology.

[0005] The present invention provides the following technical solutions: a high-damping magnetorheological seismic isolation device and method for buildings, comprising: a base plate, a stand, a main board and a reset column, both sides of the upper surface of the base plate are provided with through grooves, the inner sliding clamp of the through grooves has two sleeves, the tops of the two sleeves are fixedly connected with racks, the stand is fixedly connected to the top of the base plate, the inner bottom of the stand is fixedly connected with a first magnetorheological damper, the top of the first magnetorheological damper is fixedly connected with a slider, the main board is arranged just above the base plate, and the number of the sliders is There are four of them, and they are fixedly connected at the four corners of the lower surface of the mainboard respectively; a displacement groove is opened on the upper surface of the mainboard; the reset column is arranged inside the displacement groove; the top of the reset column is fixedly connected with a central ball joint seat; the four sides of the central ball joint seat are provided with a second magnetorheological damper; the four side edges of the upper surface of the mainboard are fixedly connected with a ball joint support; the second magnetorheological damper is located between the ball joint support and the central ball joint seat; the top of the central ball joint seat is provided with a central ball joint cover; the top of the central ball joint cover is provided with a top plate.

[0006] Preferably, both side walls of the stand are provided with sliding grooves, and both side surfaces of the slide block are fixedly connected with clamping blocks, and the clamping blocks are slidably engaged with the sliding grooves.

[0007] Preferably, a slide rod is fixedly connected to the inner wall of the through slot, the sleeve block is slidably sleeved on the surface of the slide rod, a side groove is formed on the top edge of the through slot, and the rack is movably embedded in the side groove.

[0008] Preferably, the top of the base plate is fixedly connected with a stand, and the inner wall of the stand is rotatably connected with gear three, gear two and gear one from top to bottom in sequence, and gear three is meshed with gear two, and gear two is meshed with gear one.

[0009] Preferably, a side plate is provided on the side of the sliding block, the side plate is meshed with gear three, and the gear one is meshed with the rack.

[0010] Preferably, a return spring is movably sleeved on the surface of the slide rod, one end of the return spring is fixedly connected to the groove wall of the through groove, and the other end of the return spring is fixedly connected to the side surface of the sleeve block.

[0011] Preferably, a ball joint cover plate is provided at the top of the ball joint support, and a first threaded column is fixedly connected to the top of the ball joint support, and a first nut is threadedly sleeved on the surface of the first threaded column, one end of the second magnetorheological damper is movably embedded in the top of the ball joint support, and the other end of the second magnetorheological damper is movably embedded in the edge of the central ball joint seat, and threaded holes are opened at the four corners of the upper surface of the central ball joint seat, and the four corners of the central ball joint cover are threadedly connected with fastening bolts, and the bottom end of the fastening bolt is threadedly connected to the threaded hole.

[0012] Preferably, a second threaded column is fixedly connected to the top of the central ball hinge cover, and a second threaded column is movably inserted into the surface of the top plate. A second nut is threadedly connected to the surface of the second threaded column, and the bottom end of the second nut is in contact with the upper surface.

[0013] A high-damping magnetorheological seismic isolation method for a building comprises the following steps: Step 1: When the device receives longitudinal vibration, when the slider moves downward, the side plate meshes with gear 3, which will drive gear 3 to rotate, and gear 3 can drive gear 2 to rotate, and then the rotating gear 2 drives gear 1 to rotate, so that when the slider moves downward, the rack will move synchronously with the sleeve block and drive the reset spring to stretch, and the tension of the reset spring is applied to the sleeve block, driving the rack to move; Step 2: When the tension of the reset spring is applied to the sleeve block, the rack is driven to move. During the movement, the rack drives gear 1 to rotate, gear 1 will drive gear 2 to rotate, gear 2 will drive gear 3 to rotate, and gear 3 will drive the slider to move. The multiple buffer shock absorbing mechanisms and multi-stage buffer shock absorbing can be offset by the reset spring and the first magnetorheological damper. Step 3: When the top plate is subjected to lateral pressure, the second magnetorheological damper can make different judgments on the vibration level according to the magnitude of the force, and take different countermeasures according to different vibration levels, which can effectively improve the seismic isolation effect of coping with different levels of vibration, while reducing the damage to the device caused by vibration, and effectively prolonging the service life of the seismic isolation device; Step 4: The two second magnetorheological dampers in opposite directions cooperate with each other to achieve horizontal bidirectional shock absorption. While isolating external excitation, they can also dissipate vibration energy and protect the seismic isolation device from being damaged under large external excitation. The bottom end of the reset column coincides with the inner bottom of the displacement groove. Both ends of the four second magnetorheological dampers have good activity and automatically reset after the external excitation is reduced or disappears.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This kind of high-damping magnetorheological seismic isolation device for buildings is provided with a sleeve block and a stand. When receiving longitudinal vibration, a first magnetorheological damper is used to replace the high-damping laminated rubber. The stiffness and damping of the seismic isolation support can be controlled by changing the size of the magnetic field, which effectively avoids the occurrence of resonance. At the same time, when the slider moves downward, the side plate is engaged with gear three, which will drive gear three to rotate. At the same time, gear three can drive gear two to rotate, and then the rotating gear two drives gear one to rotate, so that when the slider moves downward, the rack will move synchronously with the sleeve block and drive the reset spring to stretch. The tension of the reset spring is applied to the sleeve block to drive the rack to move. Similarly, the rack will move during the movement. When the moving gear one rotates, gear one will drive gear two to rotate, gear two will drive gear three to rotate, and gear three will drive the slider to move. It has multiple buffer and shock-absorbing mechanisms and multi-level buffer and shock-absorbing mechanisms. It can offset the vibrations through the reset spring and the first magnetorheological damper. It is suitable for different types of vibrations and plays a role of seismic isolation. The reset spring and the first magnetorheological damper are provided to offset the impact and vibration. The first magnetorheological damper and the stand are provided to increase the support area, enhance the stability of the support, and extend its service life. In addition, the sleeve block, rack, gear one, gear two, gear three and side plate are provided, so that the impact force can be neutralized by compression and sliding of the reset spring when the sleeve block moves, thereby playing a stable seismic isolation effect.

[0015] 2. This type of high-damping magnetorheological seismic isolation device for buildings is provided with a reset column and a second magnetorheological damper. When the top plate is subjected to lateral pressure, the second magnetorheological damper can make different judgments on the vibration level according to the magnitude of the force, and take different countermeasures according to different vibration levels, which can effectively improve the seismic isolation effect of coping with different levels of vibration, while reducing the damage to the device caused by vibration, and effectively improve the service life of the seismic isolation device. The two second magnetorheological dampers in relative directions cooperate with each other to achieve horizontal bidirectional shock absorption, and can dissipate vibration energy while isolating external excitation, protecting the seismic isolation device from being damaged under large external excitation. The bottom end of the reset column coincides with the inner bottom of the displacement groove, and both ends of the four second magnetorheological dampers have good activity and automatically reset after the external excitation is reduced or disappears. It has a simple structure, strong energy consumption capacity, low energy consumption, high reliability, and continuously adjustable damping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a schematic diagram of the bottom plate structure of the present invention; Figure 3 This is a schematic diagram of the stand structure of the present invention; Figure 4 This is a schematic diagram of the cover plate structure of the present invention; Figure 5It is a schematic diagram of the top plate structure of the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 100, bottom plate; 101, through slot; 102, slide bar; 103, return spring; 104, side slot; 200, sleeve block; 201, rack; 202, stand; 203, gear 1; 204, gear 2; 205, gear 3; 300, stand; 301, first magnetorheological damper; 302, slide groove; 303, slider; 304, side plate; 305, block; 400, main board; 401, ball joint support; 402, first threaded column; 403, first nut; 404, ball joint cover plate; 405, displacement groove; 500, reset column; 501, central ball joint seat; 502, threaded hole; 503, second magnetorheological damper; 504, central ball joint cover; 505, fastening bolt; 506, second threaded column; 507, second nut; 600, top plate; 601, limiting hole. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-5A high-damping magnetorheological seismic isolation device and method for buildings, comprising: a base plate 100, a stand 300, a main board 400 and a reset column 500, through grooves 101 are provided on both sides of the upper surface of the base plate 100, two sleeves 200 are slidably clamped inside the through grooves 101, the tops of the two sleeves 200 are fixedly connected with racks 201, the stand 300 is fixedly connected to the top of the base plate 100, the inner bottom of the stand 300 is fixedly connected with a first magnetorheological damper 301, the top of the first magnetorheological damper 301 is fixedly connected with a slider 303, the main board 400 is arranged directly above the base plate 100, and the number of the sliders 303 is four, And they are respectively fixedly connected at the four corners of the lower surface of the main board 400, a displacement groove 405 is opened on the upper surface of the main board 400, the reset column 500 is arranged inside the displacement groove 405, the top of the reset column 500 is fixedly connected with a central ball joint seat 501, and the four sides of the central ball joint seat 501 are provided with a second magnetorheological damper 503, the four side edges of the upper surface of the main board 400 are fixedly connected with a ball joint support 401, the second magnetorheological damper 503 is located between the ball joint support 401 and the central ball joint seat 501, the top of the central ball joint seat 501 is provided with a central ball joint cover 504, and the top of the central ball joint cover 504 is provided with a top plate 600.

[0020] For further preference, see Figure 1 , Figure 3 The two side walls of the stand 300 are provided with slide grooves 302, and the two side surfaces of the slider 303 are fixedly connected with clamping blocks 305, which are slidably engaged with the slide grooves 302. The moving path of the slider 303 is limited to ensure that the slider 303 can slide at a specified position.

[0021] For further preference, see Figure 1 , Figure 2 , Figure 3 The inner wall of the through slot 101 is fixedly connected with a slide bar 102, the sleeve block 200 is slidably sleeved on the surface of the slide bar 102, the top edge of the through slot 101 is provided with a side slot 104, and the rack 201 is movably embedded in the side slot 104. The sleeve block 200 can slide in the side slot 104 without affecting other structures, and the rack 201 and the sleeve block 200 are integrated.

[0022] For further preference, see Figure 1 , Figure 3 The top of the bottom plate 100 is fixedly connected to a stand 202, and the inner wall of the stand 202 is connected to gear 3 205, gear 2 204 and gear 1 203 in a rotational manner from top to bottom. Gear 3 205 meshes with gear 2 204, and gear 2 204 meshes with gear 1 203. Figure 1 , Figure 2The side of the slider 303 is provided with a side plate 304, the side plate 304 meshes with the gear 3 205, and the gear 1 203 meshes with the rack 201. When the slider 303 moves downward, the side plate 304 meshes with the gear 3 205, which will drive the gear 3 205 to rotate, and the gear 3 205 can drive the gear 2 204 to rotate, and then the rotating gear 2 204 drives the gear 1 203 to rotate, so that when the slider 303 moves downward, the rack 201 will move synchronously with the sleeve 200.

[0023] For further preference, see Figure 1 , Figure 2 , Figure 3 The surface of the slide bar 102 is movably sleeved with a return spring 103, one end of which is fixedly connected to the groove wall of the through groove 101, and the other end of which is fixedly connected to the side of the sleeve block 200. The tension of the return spring 103 is applied to the sleeve block 200, driving the rack 201 to move. Similarly, the rack 201 drives the gear 1 203 to rotate during the movement, and the gear 1 203 will drive the gear 2 204 to rotate, and the gear 2 204 drives the gear 3 205 to rotate, and the gear 3 205 will drive the slider 303 to move. The multiple buffering and shock absorbing mechanisms and multi-stage buffering and shock absorbing can be offset by the return spring 103 and the first magnetorheological damper 301, adapting to different types of vibrations and playing a role of seismic isolation.

[0024] For further preference, see Figure 1 , Figure 4 A ball joint cover plate 404 is provided at the top of the ball joint support 401, and a first threaded column 402 is fixedly connected to the top of the ball joint support 401. A first nut 403 is threadedly sleeved on the surface of the first threaded column 402. One end of the second magnetorheological damper 503 is movably embedded in the top of the ball joint support 401, and the other end of the second magnetorheological damper 503 is movably embedded in the edge of the central ball joint seat 501. Threaded holes 502 are provided at the four corners of the upper surface of the central ball joint seat 501, and fastening bolts 505 are threadedly connected to the four corners of the central ball joint cover 504, and the bottom end of the fastening bolt 505 is threadedly connected to the threaded hole 502. The second magnetorheological damper 503 can be installed between the ball joint support 401 and the central ball joint support 501. The two second magnetorheological dampers 503 in opposite directions cooperate with each other to achieve horizontal bidirectional shock absorption. While isolating external excitation, they can also dissipate vibration energy and protect the seismic isolation device from being damaged under large external excitation. The bottom end of the reset column 500 is consistent with the inner bottom of the displacement groove 405. Both ends of the four second magnetorheological dampers 503 have good activity and automatically reset after the external excitation is reduced or disappears.

[0025] For further preference, see Figure 1 , Figure 5The top of the central ball joint cover 504 is fixedly connected with a second threaded column 506, the surface of the top plate 600 is provided with a 601, the second threaded column 506 is movably inserted into the inside of the 601, the surface of the second threaded column 506 is threadedly connected with a second nut 507, and the bottom end of the second nut 507 is in contact with the upper surface of the 601. It is convenient to fix and install the top plate 600.

[0026] A high-damping magnetorheological seismic isolation method for a building comprises the following steps: Step 1: When the device receives longitudinal vibration, when the slider 303 moves downward, the side plate 304 meshes with the gear 3 205, which will drive the gear 3 205 to rotate, and the gear 3 205 can drive the gear 2 204 to rotate, and then the rotating gear 204 drives the gear 1 203 to rotate, so that when the slider 303 moves downward, the rack 201 will move synchronously with the sleeve 200, and drive the reset spring 103 to stretch, and the tension of the reset spring 103 is applied to the sleeve 200, driving the rack 201 to move; Step 2: When the tension of the return spring 103 is applied to the sleeve block 200, the rack 201 is driven to move. During the movement, the rack 201 drives the gear 1 203 to rotate. The gear 1 203 will drive the gear 2 204 to rotate. The gear 2 204 drives the gear 3 205 to rotate. The gear 3 205 will drive the slider 303 to move. The multiple buffering and shock absorbing mechanisms and the multi-stage buffering and shock absorbing can be offset by the return spring 103 and the first magnetorheological damper 301. Step 3: When the top plate 600 is subjected to lateral pressure, the second magnetorheological damper 503 can make different judgments on the vibration level according to the magnitude of the force, and take different countermeasures according to different vibration levels, which can effectively improve the seismic isolation effect of coping with different levels of vibration, while reducing the damage to the device caused by vibration, and effectively prolonging the service life of the seismic isolation device; Step 4: The two second magnetorheological dampers 503 in opposite directions cooperate with each other to achieve horizontal bidirectional shock absorption. While isolating external excitation, they can also dissipate vibration energy and protect the seismic isolation device from being damaged under large external excitation. The bottom end of the reset column 500 is consistent with the inner bottom of the displacement groove 405. Both ends of the four second magnetorheological dampers 503 have good activity and automatically reset after the external excitation is reduced or disappears.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high damping magnetorheological seismic isolation device for buildings, characterized in that: include: A bottom plate (100), a stand (300), a main plate (400) and a reset column (500), wherein both sides of the upper surface of the bottom plate (100) are provided with through grooves (101), two sleeves (200) are slidably clamped inside the through grooves (101), the tops of the two sleeves (200) are fixedly connected to racks (201), the stand (300) is fixedly connected to the top of the bottom plate (100), the inner bottom of the stand (300) is fixedly connected to a first magnetorheological damper (301), the top of the first magnetorheological damper (301) is fixedly connected to a slider (303), the main plate (400) is arranged directly above the bottom plate (100), and the number of the sliders (303) is four, and they are respectively fixedly connected to the main plate (100). At the four corners of the lower surface of the main board (400), the upper surface of the main board (400) is provided with displacement grooves (405), the reset column (500) is arranged inside the displacement groove (405), the top of the reset column (500) is fixedly connected to a central ball joint seat (501), and the four sides of the central ball joint seat (501) are provided with a second magnetorheological damper (503), the four side edges of the upper surface of the main board (400) are fixedly connected to a ball joint support (401), the second magnetorheological damper (503) is located between the ball joint support (401) and the central ball joint seat (501), the top of the central ball joint seat (501) is provided with a central ball joint cover (504), and the top of the central ball joint cover (504) is provided with a top plate (600).

2. A high damping magnetorheological seismic isolation device for buildings according to claim 1, characterized in that: Both side walls of the stand (300) are provided with sliding grooves (302), and both side surfaces of the sliding block (303) are fixedly connected with clamping blocks (305), and the clamping blocks (305) are slidably clamped with the sliding grooves (302).

3. The high damping magnetorheological seismic isolation device for buildings according to claim 1 is characterized in that: The inner wall of the through slot (101) is fixedly connected to a slide bar (102), the sleeve block (200) is slidably sleeved on the surface of the slide bar (102), a side slot (104) is provided on the top edge of the through slot (101), and the rack (201) is movably embedded in the side slot (104).

4. The high damping magnetorheological seismic isolation device for buildings according to claim 1, characterized in that: The top of the bottom plate (100) is fixedly connected to a stand (202), and the inner wall of the stand (202) is rotatably connected to gear three (205), gear two (204) and gear one (203) in sequence from top to bottom, wherein gear three (205) meshes with gear two (204), and gear two (204) meshes with gear one (203).

5. A high damping magnetorheological seismic isolation device for buildings according to claim 4, characterized in that: A side plate (304) is provided on the side of the slider (303), the side plate (304) is meshed with gear three (205), and the gear one (203) is meshed with the rack (201).

6. The high damping magnetorheological seismic isolation device for buildings according to claim 3 is characterized by: A return spring (103) is movably sleeved on the surface of the slide rod (102), one end of the return spring (103) is fixedly connected to the groove wall of the through groove (101), and the other end of the return spring (103) is fixedly connected to the side surface of the sleeve block (200).

7. The high damping magnetorheological seismic isolation device for buildings according to claim 1, characterized in that: A ball joint cover plate (404) is arranged at the top of the ball joint support (401), a first threaded column (402) is fixedly connected to the top of the ball joint support (401), a first nut (403) is threadedly sleeved on the surface of the first threaded column (402), one end of the second magnetorheological damper (503) is movably embedded in the top of the ball joint support (401), and the other end of the second magnetorheological damper (503) is movably embedded in the edge of the central ball joint seat (501), threaded holes (502) are provided at the four corners of the upper surface of the central ball joint seat (501), and fastening bolts (505) are threadedly connected to the four corners of the central ball joint cover (504), and the bottom ends of the fastening bolts (505) are threadedly connected to the threaded holes (502).

8. The high damping magnetorheological seismic isolation device for buildings according to claim 1, characterized in that: A second threaded column (506) is fixedly connected to the top of the central ball joint cover (504), a surface of the top plate (600) is provided with (601), the second threaded column (506) is movably inserted into the interior of (601), a second nut (507) is threadedly connected to the surface of the second threaded column (506), and the bottom end of the second nut (507) is in contact with the upper surface of (601).

9. A high damping magnetorheological seismic isolation method for buildings according to claims 1 to 8, characterized in that: The following steps are involved: Step 1: When the device receives longitudinal vibration, the slider (303) moves downward. Since the side plate (304) is meshed with the gear three (205), the gear three (205) will be driven to rotate. At the same time, the gear three (205) can drive the gear two (204) to rotate, and then the rotating gear two (204) drives the gear one (203) to rotate. When the slider (303) moves downward, the rack (201) will move synchronously with the sleeve (200) and drive the reset spring (103) to stretch. The tension of the reset spring (103) is applied to the sleeve (200), driving the rack (201) to move; Step 2: When the tension of the return spring (103) is applied to the sleeve (200), the rack (201) is driven to move. During the movement, the rack (201) drives the gear 1 (203) to rotate. The gear 1 (203) will drive the gear 2 (204) to rotate. The gear 2 (204) drives the gear 3 (205) to rotate. The gear 3 (205) will drive the slider (303) to move. The multiple buffering and shock absorbing mechanisms and the multi-level buffering and shock absorbing can be offset by the return spring (103) and the first magnetorheological damper (301); Step 3: When the top plate (600) is subjected to lateral pressure, the second magnetorheological damper (503) can make different judgments on the vibration level according to the magnitude of the force, and take different response measures according to the different vibration levels, which can effectively improve the seismic isolation effect of coping with vibrations of different levels, while reducing the damage to the device caused by the vibration, and effectively increasing the service life of the seismic isolation device; Step 4: The two second magnetorheological dampers (503) in opposite directions cooperate with each other to achieve horizontal bidirectional shock absorption, which can dissipate vibration energy while isolating external excitation, and protect the seismic isolation device from being damaged under large external excitation. The bottom end of the reset column (500) is consistent with the inner bottom of the displacement groove (405), and both ends of the four second magnetorheological dampers (503) have good mobility and automatically reset after the external excitation is reduced or disappears.

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