A core wall deformation control system based on shape memory alloy

Abstract

The application relates to a shape memory alloy-based core tube deformation control system which combines displacement amplification, shape memory alloy energy dissipation and self-resetting features. Compared with the prior art, the shape memory alloy-based core tube deformation control system can amplify the tiny displacement generated by core tube deformation by tens of times through a transmission lever and a coaxial pulley, so that the energy dissipation component can effectively play a role, in addition, the shape memory alloy wire can be deformed through the coaxial pulley, so that the superelasticity of the shape memory alloy wire can be better utilized to generate damping to the external input energy, thereby playing a role in dissipating energy, in addition, the system can detect the deformation size through a probe installed on a guide rail, and after the deformed shape memory alloy wire is powered and heat-treated, the node can be self-reset, so that the cost of rectification after the structure is deformed under the influence of external force or its own gravity is reduced.

Description

Technical Field

[0001] This invention relates to the field of core tube deformation control technology, and in particular to a core tube deformation control system based on shape memory alloy. Background Technology

[0002] Frame-core tube structures are one of the most commonly used structural systems in high-rise and super high-rise buildings. In a frame-core tube structure, the core tube primarily bears lateral loads such as earthquakes and wind, ensuring that the structure does not undergo significant lateral deformation; the outrigger trusses of the core tube can adjust the stress and deformation of the core tube. In actual engineering, the core tube is usually located at the exact center of the floor plan to meet the requirement of building plan regularity.

[0003] However, some supertall buildings with special functional requirements now exist, necessitating special structural layouts and requiring offset core tubes. Unlike traditional core tubes placed at the center of the building plan, supertall buildings with offset core tube structures experience additional overturning moments under vertical loads because the point of application of the vertical load from the superstructure does not coincide with the neutral axis of the floor. This leads to increased axial forces in the columns and walls at corresponding locations, and the structure also undergoes overall bending deformation, resulting in differences in inter-story deformation. To reduce lateral deformation, the column cross-sections are commonly increased to improve lateral stiffness, which significantly increases the building cost. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a core tube deformation control system based on shape memory alloy. Shape memory alloy, as a novel engineering material, has properties such as superelasticity and extremely strong deformation recovery ability. Due to its superelasticity, shape memory alloy can provide large damping, thereby consuming a large amount of energy when external energy is input. This invention develops an offset core tube structure deformation control system based on shape memory alloy, which can reduce construction costs and improve construction efficiency and subsequent maintenance and replacement.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] The purpose of this invention is to provide a core tube deformation control system based on shape memory alloy, including a frame column, a core tube, an upper chord, a lower chord, a crossbar, a left vertical bar, a right vertical bar, a fulcrum, a transmission lever, a bottom anchor bolt, a bottom pulley assembly, a middle pulley assembly, a top pulley assembly, a top anchor bolt, an energy dissipation assembly, a guide rail, and a shape memory alloy stranded wire assembly. The frame column and the core tube are connected from top to bottom by the upper chord, the crossbar, and the lower chord, respectively. The upper chord, the crossbar, and the lower chord are connected by the left and right vertical bars. The fulcrum is provided on the lower chord, and the fulcrum is hinged to the transmission lever. The transmission lever can rotate in a plane around the fulcrum, and the deformation of the core tube can be controlled by the transmission lever. Interlayer displacement is amplified; the transmission lever is hinged to the crossbar, and the transmission lever can rotate around the hinge node; the bottom pulley assembly is fixed to the lower chord; the middle pulley assembly is fixed to the left and right vertical bars; the top pulley assembly is fixed to the upper chord; two bottom anchor bolts are provided, respectively located on the outside of the frame column and the inside of the core tube; both ends of the shape memory alloy stranded wire assembly are anchored in the bottom anchor bolt and the top anchor bolt, respectively; the top anchor bolt is connected to the energy dissipation assembly, the energy dissipation assembly is connected to the transmission lever, the top anchor bolt is connected to the guide rail, the top anchor bolt is restricted to move on the guide rail, and the movement of the energy dissipation assembly connected to the top anchor bolt is also restricted.

[0007] Furthermore, the core tube deformation control system based on shape memory alloy also includes tension nuts, two of which are respectively installed on the frame column and the core tube; the tension nuts are connected to the shape memory alloy stranded wire assembly, and the tension nuts can adjust the prestress value of the shape memory alloy stranded wire assembly, the prestress value being determined through actual engineering.

[0008] Furthermore, the shape memory alloy stranded wire assembly includes an upper shape memory alloy stranded wire, a middle shape memory alloy stranded wire, and a lower shape memory alloy stranded wire; one end of the lower shape memory alloy stranded wire is anchored in the bottom anchor bolt, the lower shape memory alloy stranded wire is connected to the bottom pulley assembly, and the other end of the lower shape memory alloy stranded wire is fixed to the middle pulley assembly; one end of the middle shape memory alloy stranded wire is fixed to the middle pulley assembly, and the other end is fixed to the top pulley assembly; one end of the upper shape memory alloy stranded wire is fixed to the top pulley assembly, and the other end is anchored in the top anchor bolt.

[0009] Furthermore, the lower section of the shape memory alloy stranded wire is wrapped with an insulating sleeve to prevent leakage of current from the stranded wire, which could affect the structure or personal safety.

[0010] Furthermore, holes are provided on the frame column for the lower section of shape memory alloy stranded wire to pass through.

[0011] Furthermore, the bottom pulley assembly includes two bottom pulley supports and two bottom pulleys; each bottom pulley support includes a bottom pulley rotation shaft, the center of which passes through the bottom pulley rotation shaft and is able to rotate freely around the bottom pulley rotation shaft; both bottom pulley supports are fixed to the lower chord.

[0012] Furthermore, the central pulley assembly includes two central pulleys, each comprising two coaxial pulleys with different radii. The specific ratio of the radii of the two coaxial pulleys can be determined according to the calculated magnification factor required. The two central pulleys are respectively fixed to the left vertical rod and the right vertical rod shown.

[0013] Furthermore, the top pulley assembly includes two top pulley supports and two top pulleys. Each top pulley comprises two coaxial pulleys with different radii, and the specific ratio of the radii of the two coaxial pulleys can be determined according to the calculated magnification factor required. Each top pulley support includes a top pulley rotation shaft, through which the center of the top pulley passes and can rotate freely around the top pulley rotation shaft. Both top pulley supports are fixed to the lower chord.

[0014] Furthermore, the core tube deformation control system based on shape memory alloy also includes an energizing device and a probe; the probe is located at one end of the transmission lever; the energizing device is connected to the shape memory alloy stranded wire assembly.

[0015] Furthermore, the core tube deformation control system based on shape memory alloy also includes a controller. The two ends of the controller are respectively connected to the power supply device and the probe. The probe can detect its own specific position coordinates on the guide rail and collect the relative deformation of the core tube and the frame column over time through data acquisition and signal analysis. After calculation by the controller, the signal to correct the deformation is transmitted to the power supply device. The power supply device heats the lower section of shape memory alloy stranded wire by energizing it, thereby utilizing the characteristics of shape memory alloy to control and eliminate deformation.

[0016] Furthermore, the communication connection includes a wireless connection or a connection via a wire.

[0017] Furthermore, one end of the connecting rod is connected to the outside, and the other end is connected to the central movable shaft. The connecting rod can contact the metal disc and the metal outer frame. The central movable shaft can contact the metal disc. The metal disc serves as a limiting element. The inner wall of the metal outer frame is provided with a cushioning material. The metal disc and the partition plate have appropriately sized holes in their centers. The central movable shaft passes through the holes through the metal disc and the partition plate. The partition plate can contact the central movable shaft and rub against the cushioning material. The shape memory alloy spring has multiple segments. All segments of the shape memory alloy spring are arranged around the central movable shaft. The two ends of the shape memory alloy springs on both sides are connected to the metal disc and the partition plate. The two ends of each segment of the shape memory alloy spring in the middle are connected to the partition plate.

[0018] Furthermore, one end of the connecting rod is fixedly connected to the transmission lever, and one end of the metal outer frame is fixedly connected to the top anchor bolt.

[0019] Furthermore, one end of the lower section shape memory alloy stranded wire is anchored in the bottom anchor bolt, passes through the hole on the frame column, goes around the bottom pulley on the lower chord, and the other end is fixed to the large radius pulley of the middle pulley.

[0020] Furthermore, one end of the middle section shape memory alloy stranded wire is fixed to the small radius pulley of the middle pulley, and the other end is fixed to the large radius pulley of the top pulley on the upper chord.

[0021] Furthermore, one end of the upper shape memory alloy stranded wire is fixed to the small-radius pulley of the top pulley, and the other end is anchored in the top anchor bolt.

[0022] This invention combines features such as displacement amplification, shape memory alloy energy dissipation, and self-resetting to form a core tube deformation control system based on shape memory alloy for offset core tube structures. Under the influence of earthquakes, wind, and the structure's own gravity, the structure often undergoes significant lateral deformation. Through transmission levers and coaxial pulleys, this system can amplify the minute displacements generated by core tube deformation by tens of times, thereby enabling the energy dissipation components to function effectively. Furthermore, the increased deformation of the shape memory alloy strands through the coaxial pulleys allows for better utilization of their hyperelasticity to dampen externally input energy, thus dissipating energy. In addition, the system can detect the magnitude of deformation using probes mounted on guide rails. By applying an electric current to the deformed shape memory alloy strands for heat treatment, the nodes can self-reset, reducing the cost of corrective measures after the structure deforms under external forces or its own gravity.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The present invention provides a core tube deformation control system based on shape memory alloy, which amplifies the lateral deformation of the core tube structure through leverage, magnifying the small deformation by tens of times, thereby effectively enhancing the energy dissipation capacity of the energy dissipation component.

[0025] 2) The core tube deformation control system based on shape memory alloy provided by the present invention can adjust the prestress value of the shape memory alloy strand and set an appropriate size according to the actual engineering needs, thereby maximizing the energy consumption and deformation control capabilities of the system.

[0026] 3) The present invention provides a core tube deformation control system based on shape memory alloy. By detecting the deformation in real time, the structure can achieve self-reset by heating the shape memory alloy strands by applying electricity when the structure is deformed by external force.

[0027] 4) The present invention provides a core tube deformation control system based on shape memory alloy, which realizes the function of easy assembly and replacement of structure, reduces construction cost, and is conducive to improving construction efficiency and subsequent maintenance and replacement. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the core tube deformation control system based on shape memory alloy according to the present invention.

[0029] Figure 2 This is a cross-sectional view of the energy dissipation component of the present invention.

[0030] Figure 3 This is a schematic diagram illustrating the control function of a core tube deformation control system based on shape memory alloy according to the present invention.

[0031] The numbers in the diagram are as follows:

[0032] 1-Frame column; 2-Core tube; 3-Upper chord; 4-Lower chord; 5-Horizontal bar; 6-Left vertical bar; 7-Right vertical bar; 8-Fulcrum; 9-Transmission lever; 10-Tension nut; 11-Bottom anchor bolt; 12-Electrification device; 13-Bottom pulley support; 14-Bottom pulley; 15-Middle pulley; 16-Top pulley; 17-Top pulley support; 18-Top anchor bolt; 19-Energy dissipation component; 20-Guide rail; 21-Probe; 22-Insulating sleeve; 23-Upper section shape memory alloy stranded wire; 24-Middle section shape memory alloy stranded wire; 25-Lower section shape memory alloy stranded wire;

[0033] 1901 - Metal outer frame; 1902 - Connecting rod; 1903 - Metal disc; 1904 - Shape memory alloy spring; 1905 - Divider plate; 1906 - Buffer material; 1907 - Central movable shaft. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, control methods, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0035] Example

[0036] like Figure 1 As shown, this embodiment provides a core tube deformation control system based on shape memory alloy, including a frame column 1, a core tube 2, an upper chord 3, a lower chord 4, a horizontal bar 5, a left vertical bar 6, a right vertical bar 7, a fulcrum 8, a transmission lever 9, a tension nut 10, a bottom anchor bolt 11, a power supply device 12, a bottom pulley support 13, a bottom pulley 14, a middle pulley 15, a top pulley 16, a top pulley support 17, a top anchor bolt 18, an energy dissipation component 19, a guide rail 20, a probe 21, an insulating sleeve 22, an upper section shape memory alloy stranded wire 23, a middle section shape memory alloy stranded wire 24, a lower section shape memory alloy stranded wire 25, and a controller.

[0037] Holes are provided on the frame column 1 to allow the lower section of shape memory alloy stranded wire 25 to pass through.

[0038] The frame column 1 and the core tube 2 are connected from top to bottom by the upper chord 3, the crossbar 5 and the lower chord 4 respectively; the upper chord 3, the crossbar 5 and the lower chord 4 are connected by the left vertical bar 6 and the right vertical bar 7; the lower chord 4 is provided with a fulcrum 8, which is hinged to the transmission lever 9. The transmission lever can rotate in the plane around the fulcrum, and the inter-story displacement of the core tube can be amplified through the transmission lever; the transmission lever 9 is hinged to the crossbar 5, and the transmission lever 9 can rotate around the hinge node.

[0039] Two tension nuts 10 are provided, one on the frame column 1 and the other on the core tube 2. The tension nuts 10 are connected to the lower section shape memory alloy stranded wire 25. The tension nuts 10 can adjust the prestress value of the lower section shape memory alloy stranded wire 25. The prestress value is determined through actual engineering.

[0040] Two bottom anchor bolts 11 are provided, one on the outside of the frame column 1 and the other on the inside of the core tube 2.

[0041] The bottom pulley support 13 includes a bottom pulley rotation shaft, and the center of the bottom pulley 14 passes through the bottom pulley rotation shaft and can rotate freely around the bottom pulley rotation shaft; there are two bottom pulley supports 13 and two bottom pulleys 14, and the two bottom pulley supports 13 are fixed on the lower chord 4, and the two bottom pulleys 14 are respectively connected to the two bottom pulley supports 13.

[0042] The middle pulley 15 includes two coaxial pulleys with different radii. The specific ratio of the radii of the two coaxial pulleys can be determined according to the calculated magnification factor. There are two middle pulleys 15, which are fixed to the left vertical rod 6 and the right vertical rod 7 as shown, respectively.

[0043] The top pulley 16 includes two coaxial pulleys with different radii. The specific ratio of the radii of the two coaxial pulleys can be determined according to the calculated magnification factor. The top pulley support 17 includes a top pulley rotation shaft. The center of the top pulley 16 passes through the top pulley rotation shaft and can rotate freely around the top pulley rotation shaft. There are two top pulley supports 17 and two top pulleys 16. Both top pulley supports 17 are fixed on the lower chord 4, and the two top pulleys 16 are connected to the two top pulley supports 17 respectively.

[0044] Two bottom pulley supports 13 are arranged on the left and right sides of the lower chord 4, and two top pulley supports 17 are arranged on the left and right sides of the lower chord 4.

[0045] The two ends of the shape memory alloy stranded wire assembly are anchored in the bottom anchor bolt 11 and the top anchor bolt 18, respectively.

[0046] The top anchor bolt 18 is connected to the energy dissipation component 19, the energy dissipation component 19 is connected to the transmission lever 9, the top anchor bolt 18 is connected to the guide rail 20, the top anchor bolt 18 is restricted to move on the guide rail, and the movement of the energy dissipation component 19 connected to the top anchor bolt 18 is also restricted.

[0047] One end of the lower shape memory alloy stranded wire 25 is anchored in the bottom anchor bolt 11, passes through the hole on the frame column 1, goes around the bottom pulley 14 on the lower chord 4, and the other end is fixed to the large radius pulley of the middle pulley 15.

[0048] The lower section of shape memory alloy stranded wire 25 is wrapped with an insulating sleeve 22 to prevent leakage of electricity from the stranded wire, which could affect the structure or personal safety.

[0049] One end of the mid-section shape memory alloy stranded wire 24 is fixed to the small-radius pulley of the middle pulley 15, and the other end is fixed to the large-radius pulley of the top pulley 16 on the upper chord 3.

[0050] One end of the upper shape memory alloy stranded wire 23 is fixed to the small radius pulley of the top pulley 16, and the other end is anchored in the top anchor bolt 18.

[0051] The probe 21 is located at one end of the transmission lever 9.

[0052] The energizing device 12 is connected to the lower section of shape memory alloy stranded wire 25.

[0053] The controller is a microcontroller or a processor based on x86, ARM, or RISC-V architecture. The two ends of the controller are connected wirelessly to the power supply device 12 and the probe 21, or connected via wires. The probe 21 can detect its own position coordinates on the guide rail 20 and collect the relative deformation of the core tube 2 and the frame column 1 over time through data acquisition and signal analysis. After calculation by the controller, the signal to correct the deformation is transmitted to the power supply device 12. The power supply device 12 heats the lower section of the shape memory alloy stranded wire 25 by energizing it, thereby utilizing the characteristics of the shape memory alloy to control and eliminate the deformation.

[0054] like Figure 2 As shown, one end of the connecting rod 1902 is connected to the outside, and the other end is connected to the central movable shaft 1907. The connecting rod 1902 can contact the metal disc 1903 and the metal outer frame 1901. The central movable shaft 1907 can contact the metal disc 1903. The metal disc 1903 plays a limiting role. The inner wall of the metal outer frame 1901 is provided with a cushioning material 1906. The metal disc 1903 and the partition plate 1905 have holes of appropriate size in their centers. The metal disc 1903 and the partition plate 1905 are controlled by the central... The movable shaft 1907 passes through the hole, and the partition plate 1905 can contact the central movable shaft 1907. The partition plate 1905 contacts and rubs against the buffer material 1906. The shape memory alloy spring 1904 has multiple segments, and the multiple segments of the shape memory alloy spring 1904 are all arranged around the central movable shaft 1907. The two ends of the shape memory alloy springs 1904 on both sides are connected to the metal disc 1903 and the partition plate 1905, and the two ends of each segment of the shape memory alloy spring 1904 in the middle are connected to the partition plate 1905.

[0055] One end of the connecting rod 1902 is fixedly connected to the transmission lever 9, and one end of the metal outer frame 1901 is fixedly connected to the top anchor bolt 18.

[0056] like Figure 3As shown, when the core tube 1 undergoes significant lateral deformation under external force or its own gravity, the lower chord 4 and the crossbar 5 first become misaligned. The relative displacement formed by this misalignment is amplified by the transmission lever 9, which pulls the upper section shape memory alloy strand 23 connected to it, causing the top pulley 16 to rotate. The top pulley 16 then pulls the middle section shape memory alloy strand 24, causing the middle pulley 15 to rotate. The middle pulley 15 ultimately pulls the lower section shape memory alloy strand 25, causing it to stretch significantly, resulting in a deformation equivalent to amplifying the original small deformation of the core tube by tens of times. Through the multiple amplification of displacement by the transmission lever 9, the top pulley 16, and the middle pulley 15, the above-mentioned core tube deformation control system based on shape memory alloy can amplify the small displacement generated by the deformation of the core tube 1 by tens of times, enabling the shape memory alloy to better utilize its superelasticity to dampen the energy input from the outside, thereby improving the energy dissipation effect of the energy dissipation component. In addition, after the core tube 1 deforms, the system can monitor the magnitude of the deformation of the core tube 1 through the probe 21 installed on the guide rail 20. After the energizing device 12 heats the deformed lower section shape memory alloy stranded wire 25 by energizing it, its restoring force can make the deformed node self-reset.

[0057] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A core tube deformation control system based on shape memory alloy, characterized in that, Includes frame column (1), core tube (2), upper chord (3), lower chord (4), crossbar (5), left vertical bar (6), right vertical bar (7), fulcrum (8), transmission lever (9), bottom anchor bolt (11), bottom pulley assembly, middle pulley assembly, top pulley assembly, top anchor bolt (18), energy dissipation assembly (19), guide rail (20), and shape memory alloy stranded wire assembly; The frame column (1) and the core tube (2) are connected from top to bottom by the upper chord (3), the crossbar (5) and the lower chord (4), respectively. The upper chord (3), the horizontal bar (5), and the lower chord (4) are connected by the left vertical bar (6) and the right vertical bar (7); The lower chord (4) is provided with the fulcrum (8), and the fulcrum (8) is hinged to the transmission lever (9); The transmission lever (9) is hinged to the crossbar (5); The bottom pulley assembly is fixed to the lower chord (4); The middle pulley assembly is fixed to the left vertical rod (6) and the right vertical rod (7); The top pulley assembly is fixed to the upper chord (3); Two bottom anchor bolts (11) are provided, respectively on the frame column (1) and the core tube (2); The two ends of the shape memory alloy stranded wire assembly are respectively anchored in the bottom anchor bolt (11) and the top anchor bolt (18); The top anchor bolt (18) is connected to the energy dissipation component (19), the energy dissipation component (19) is connected to the transmission lever (9), and the top anchor bolt (18) is connected to the guide rail (20). It also includes tension nuts (10), two tension nuts (10) are provided, one on the frame column (1) and the other on the core tube (2); The tension nut (10) is connected to the shape memory alloy stranded wire assembly, and the tension nut (10) can adjust the prestress value of the shape memory alloy stranded wire assembly.

2. The core tube deformation control system based on shape memory alloy according to claim 1, characterized in that, The shape memory alloy stranded wire assembly includes an upper section shape memory alloy stranded wire (23), a middle section shape memory alloy stranded wire (24), and a lower section shape memory alloy stranded wire (25). One end of the lower shape memory alloy stranded wire (25) is anchored in the bottom anchor bolt (11), the lower shape memory alloy stranded wire (25) is connected to the bottom pulley assembly, and the other end of the lower shape memory alloy stranded wire (25) is fixed to the middle pulley assembly. One end of the middle section shape memory alloy stranded wire (24) is fixed to the middle pulley assembly, and the other end is fixed to the top pulley assembly; One end of the upper shape memory alloy stranded wire (23) is fixed to the top pulley assembly, and the other end is anchored in the top anchor bolt (18).

3. The core tube deformation control system based on shape memory alloy according to claim 2, characterized in that, The lower section of the shape memory alloy stranded wire (25) is wrapped with an insulating sleeve (22).

4. The core tube deformation control system based on shape memory alloy according to claim 1, characterized in that, The bottom pulley assembly includes two bottom pulley supports (13) and two bottom pulleys (14). The bottom pulley support (13) includes a bottom pulley rotation shaft, and the center of the bottom pulley (14) passes through the bottom pulley rotation shaft and can rotate freely around the bottom pulley rotation shaft; Both bottom pulley supports (13) are fixed to the lower chord (4).

5. The core tube deformation control system based on shape memory alloy according to claim 1, characterized in that, The central pulley assembly includes two central pulleys (15), each of which comprises two coaxial pulleys with different radii. Two central pulleys (15) are fixed to the left vertical rod (6) and the right vertical rod (7), respectively.

6. The core tube deformation control system based on shape memory alloy according to claim 1, characterized in that, The top pulley assembly includes two top pulley supports (17) and two top pulleys (16), the top pulleys (16) including two coaxial pulleys with different radii; The top pulley support (17) includes a top pulley rotation shaft, the center of the top pulley (16) passes through the top pulley rotation shaft, and is able to rotate freely around the top pulley rotation shaft; Both top pulley supports (17) are fixed to the lower chord (4).

7. The core tube deformation control system based on shape memory alloy according to claim 1, characterized in that, It also includes a power supply device (12) and a probe (21). The probe (21) is located at one end of the transmission lever (9); The energizing device (12) is connected to the shape memory alloy stranded wire assembly.

8. The core tube deformation control system based on shape memory alloy according to claim 7, characterized in that, It also includes a controller, which is communicatively connected at both ends to the power supply device (12) and the probe (21).

9. The core tube deformation control system based on shape memory alloy according to claim 1, characterized in that, The energy dissipation component (19) includes a metal outer frame (1901), a connecting rod (1902), a metal disc (1903), a shape memory alloy spring (1904), a partition plate (1905), a cushioning material (1906), and a central movable shaft (1907). One end of the connecting rod (1902) is connected to the outside, and the other end is connected to the central movable shaft (1907). The metal disc (1903) serves as a limit, and the inner wall of the metal outer frame (1901) is provided with cushioning material (1906). The metal disc (1903) and the partition plate (1905) are provided with holes in the center. The metal disc (1903) and the partition plate (1905) are passed through the holes by the central movable shaft (1907). The partition plate (1905) contacts and rubs against the cushioning material (1906). The shape memory alloy spring (1904) has multiple segments, and the multiple segments of shape memory alloy spring (1904) are all arranged around the central movable shaft (1907). The two ends of the shape memory alloy spring (1904) on both sides are connected to the metal disc (1903) and the partition plate (1905), and the two ends of each segment of shape memory alloy spring (1904) in the middle are connected to the partition plate (1905).

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