Friction self-resetting SMA composite damper

Abstract

The utility model belongs to the technical field of civil engineering equipment, and particularly relates to a friction self-resetting SMA composite damper. The friction self-resetting SMA composite damper comprises a damper body and a friction energy dissipation assembly. The damper body comprises a first shell, a first self-resetting assembly, a second self-resetting assembly and a movable arm. The movable arm comprises a partition plate and a movable arm body, the partition plate is slidably mounted in the first shell, and one end of the movable arm body penetrates through the first shell and is connected with the partition plate. The first self-resetting assembly and the second self-resetting assembly are arranged on the two sides of the partition plate respectively. The friction energy dissipation assembly comprises a second shell, a friction block, a push plate and at least one fastener, the second shell is fixed to the first shell, the friction block and the push plate are both installed in the second shell, one end of the friction block abuts against the outer side of the movable arm body, and the friction block abuts against the movable arm body by pressing the push plate through the fastener. The damper provided by the utility model has good self-resetting capacity, energy-dissipating capacity and strong rigidity, and can meet the use requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering equipment, in particular to a friction self-resetting SMA composite damper. Background Art

[0002] With the recent frequent occurrence of earthquakes, new requirements have emerged for building seismic resistance in construction projects. Traditional building seismic structures dissipate earthquake energy through deformation of their components. This design can cause permanent damage to the building's structure and significantly impact its subsequent safety. To minimize earthquake damage, protect the main structure, reduce residual deformation, and mitigate structural damage to non-replaceable components, various types of self-resetting dampers have begun to be used in building structures. The self-resetting function of dampers plays an important role in improving the overall seismic performance of buildings. While current self-resetting dampers offer good reset performance, they are prone to bending during the reset process. Once bent, the damper generally cannot be reset or its reset performance is significantly reduced, rendering it unusable. Furthermore, existing self-resetting dampers have weak energy dissipation capacity and insufficient lateral support stiffness. This makes them incapable of absorbing the energy generated by larger earthquakes and unable to provide sufficient lateral stiffness to the structure, resulting in their limited practicality as seismic components. Utility Model Content

[0003] In order to solve the problem that the existing self-resetting damper has weak energy dissipation capacity and insufficient lateral support stiffness, resulting in poor practicality when used as an anti-seismic component, the utility model provides a friction self-resetting SMA composite damper.

[0004] The utility model is implemented by the following technical solutions: a friction self-resetting SMA composite damper, which includes a damper body and a friction energy dissipation component, the damper body includes a shell one, a self-resetting component one, a self-resetting component two and a movable arm; a cavity one is provided in the shell one, the movable arm includes a partition and a movable arm body, the partition is slidably installed in the cavity, one end of the movable arm body passes through the shell one and is connected to the partition in the cavity one; the self-resetting component one and the self-resetting component two are respectively arranged on both sides of the partition along the length direction of the shell one; one end of the self-resetting component one is fixed to the partition, and the other end is movably installed on the shell one; one end of the self-resetting component two is fixed to the partition, and the other end is movably installed on the other side of the shell one; the self-resetting component one and the self-resetting component two are used to reset the partition when the partition moves in the cavity one. The cam is secured to the chassis and has a locking mechanism which allows the cam to move along the chassis, and the cam is secured to the chassis on both sides of the chassis.

[0005] As a further improvement of the present invention, the self-resetting component 1 includes a plurality of self-resetting parts 1, and the plurality of self-resetting parts 1 are distributed at equal intervals around the central axis of the shell 1 in the longitudinal direction; the self-resetting component 2 includes a plurality of self-resetting parts 2, and the plurality of self-resetting parts 2 are distributed at equal intervals around the central axis of the shell 1 in the longitudinal direction; the number of the self-resetting parts 2 is the same as the number of the self-resetting parts 1, and the corresponding self-resetting parts 1 and the self-resetting parts 2 in the longitudinal direction of the shell are not on the same straight line.

[0006] As a further improvement of the present invention, the self-resetting member includes an SMA metal rod and a spring, one end of the spring is fixed to the shell, and the other end is fixed to the partition; one end of the SMA metal rod is fixed to the partition, and the other end passes through the shell and abuts against the outer side surface of the shell.

[0007] As a further improvement of the present invention, one end of the SMA metal rod is fixed to the partition by a thread, and the other end of the SMA metal rod is provided with a limit block, and the limit block is arranged on the outside of the shell one, and the shell one is provided with a through hole one, and the through hole one is connected to the cavity one, and the SMA metal rod passes through the through hole one and is connected to the limit block; the limit block is provided with a contact surface, and the contact surface is in contact with the shell one, and the area of ​​the contact surface is larger than the area of ​​the through hole one, and the limit block is used to limit the metal rod within the cavity one.

[0008] As a further improvement of the present invention, a second through hole is provided on the second shell, the second through hole and the first through hole are concentric holes, and the area of ​​the second through hole is larger than the area of ​​the contact surface.

[0009] As a further improvement of the present invention, the shell body 1 includes an outer shell cover and a shell plate, the outer shell cover is provided with a through hole 3 and a through hole 4 along the length direction, the shell plate is installed on the side of the outer shell cover close to the through hole 4, the shell plate and the outer shell cover are used to enclose the cavity 1, the area of ​​the through hole 3 is greater than or equal to the area of ​​the cross section of the movable arm body along the length direction of the outer shell cover, so that the movable arm body can pass through the through hole 3 and out of the outer shell cover.

[0010] As a further improvement of the present invention, at least one mounting plate 1 is fixedly installed on the side of the shell plate away from the cavity 1, and at least one mounting plate 2 is fixedly installed on the end of the movable arm body away from the partition, and the friction self-resetting SMA composite damper is installed and fixed by the mounting plate 1 and the mounting plate 2.

[0011] As a further improvement of the present invention, there are multiple fasteners, and the multiple fasteners are distributed at equal intervals along the central axis of the push plate in the moving direction.

[0012] As a further improvement of the present invention, the fastener is a bolt.

[0013] As a further improvement of the present invention, the contact surface between the partition and the outer shell cover is coated with lubricating oil.

[0014] The technical solution provided by the utility model has the following beneficial effects:

[0015] (1) The present invention makes up for the problem of weak energy dissipation capacity of SMA and solves the defect that ordinary friction dampers cannot self-reset by coordinating the self-resetting component 1, the self-resetting component 2 and the friction energy dissipation component, so that the friction self-resetting SMA composite damper of the present invention has both good energy dissipation capacity and self-resetting ability.

[0016] (2) The utility model provides a plurality of self-resetting members 1 on one side of the partition and a plurality of self-resetting members 2 on the other side of the partition. The plurality of self-resetting members 1 and the plurality of self-resetting members 2 cooperate with each other, thereby improving the reset capability of the entire friction self-resetting SMA composite damper.

[0017] (3) The utility model provides a spring on the outside of each SMA metal rod. The spring can not only further enhance the self-resetting ability of the self-resetting member as a whole, but also provide lateral stiffness for the damper, thereby improving its stability.

[0018] (4) By detachably mounting the friction energy dissipation component on one side of the outer shell cover, and the friction energy dissipation component being arranged on one side of the movable arm body, the friction energy dissipation component can be disassembled and replaced even when the friction self-resetting SMA composite damper of the present invention is in use, thereby improving its practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a top view of the friction self-resetting SMA composite damper provided by the utility model.

[0020] Figure 2 For the utility model Figure 1 Cross-sectional view along AA.

[0021] Figure 3 For the utility model Figure 1 Cross-sectional view along BB.

[0022] Figure 4 For this utility model Figure 2 Enlarged schematic diagram of point C in the middle.

[0023] Figure 5 For this utility model Figure 3 Enlarged schematic diagram of point D in the middle.

[0024] Figure 6 This is a partial structural diagram of the SMA metal rod in the present invention when it passes through the through hole 1 and is connected to the limit block.

[0025] Markings in the figure are: 1. Shell 1; 11. Outer shell cover; 12. Shell plate; 121. Mounting plate 1; 13. Cavity 1; 2. Movable arm; 21. Partition; 22. Movable arm body; 221. Mounting plate 2; 31. Shell 2; 311. Baffle; 312. Through hole 2; 32. Friction block; 33. Push plate; 34. Fastener; 35. Cavity 2; 4. Self-resetting member 1; 5. Self-resetting member 2; 6. Spring; 7. SMA metal rod; 8. Limit block. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] This embodiment provides a friction self-resetting SMA composite damper, such as Figures 1 to 2 As shown, it includes a damper body and a friction energy dissipation component.

[0028] Please refer to Figure 2 and Figure 3 The damper body includes a shell 1, a self-resetting component 1, a self-resetting component 2 and a movable arm 2. The shell 1 includes an outer shell cover 11 and a shell plate 12. The outer shell cover 11 is provided with a through hole 3 and a through hole 4 along its length. The shell plate 12 is installed on the side of the outer shell cover 11 close to the through hole 4. The outer shell cover 11 and the shell plate 12 can be connected by threaded installation, and a cavity 13 is formed between the outer shell cover 11 and the shell plate 12. The movable arm 2 includes a partition 21 and a movable arm body 22. The partition 21 is installed in the cavity 13. The contact surface between the partition 21 and the outer shell cover 11 is coated with lubricating oil to reduce the friction between the partition 21 and the outer shell cover 11 and improve the smoothness of the movement of the partition 21. One end of the movable arm body 22 passes through the through hole 3 and is fixedly connected to the partition 21 in the cavity 13. The other end of the movable arm body 22 extends out of the outer shell cover 11. In this embodiment, the area of ​​the through hole three is slightly larger than the area of ​​the cross section of the movable arm body 22 along the length direction thereof.

[0029] Please refer to Figure 2 At least one mounting plate 121 is fixedly mounted on the side of the shell 12 away from the cavity 13. Each mounting plate 121 is provided with a first mounting hole. A second mounting plate 221 is fixedly mounted on the side of the movable arm body 22 away from the partition 21. Each mounting plate 221 is provided with a second mounting hole. In actual use, the side of the friction self-resetting SMA composite damper closest to the damper body can be connected to other external components through the first mounting hole, and the side of the friction self-resetting SMA composite damper closest to the movable arm body 22 can be connected to other external components through the second mounting hole. The friction self-resetting SMA composite damper is installed through the first and second mounting holes.

[0030] Both the self-resetting assembly 1 and the self-resetting assembly 2 are located within the cavity 13. By providing the self-resetting assembly 1 and the self-resetting assembly 2 on either side of the partition 21, the self-resetting assembly 1 and the self-resetting assembly 2 can be used to reset the partition 21 to its initial position when the movable arm body 22 drives the partition 21 to move within the cavity 13. The self-resetting assembly 1 and the self-resetting assembly 2 are provided on either side of the partition 21 along the length of the housing 1. The provision of the self-resetting assembly 1 and the self-resetting assembly 2 on either side of the partition 21 enhances the reset capability while also ensuring the stability of the partition 21's movement within the cavity 13. In this embodiment, when an earthquake occurs, due to the vibration generated, the movable arm body 22 will move back and forth along the length direction of the cavity 13 through the partition 21. At this time, the self-resetting component 1 and the self-resetting component 2 will reset the partition 21 to the initial position through the characteristics of their own structure, so as to achieve the purpose of protecting the building from shaking during the earthquake. The self-resetting component 1 and the self-resetting component 2 provide resistance to such shaking, consume kinetic energy, and thus reduce the vibration amplitude, thereby achieving the purpose of protecting the building and avoiding damage.

[0031] Please refer to Figures 2 to 4, the friction energy dissipation component is installed on the side of the outer shell cover 11 where the through hole three is provided. There are two friction energy dissipation components, and the two friction energy dissipation components are symmetrically arranged on both sides of the movable arm body 22. The utility model provides a friction energy dissipation component on the side of the outer shell cover 11 close to the movable arm body 22, which can realize the mutual cooperation of the friction energy dissipation component with the self-resetting component one and the self-resetting component two, and can combine the better energy dissipation capacity of the friction energy dissipation component to consume the seismic energy transmitted from the movable arm body 22, and then use the self-resetting component one and the self-resetting component two to realize the rapid reset of the movable arm 2, thereby reducing or even eliminating the residual deformation of the building after the earthquake, greatly improving the stability of the building, and reducing the cost of repairing the building after the earthquake. The friction energy dissipation component includes a shell two 31, a friction block 32, a push plate 33 and at least one fastener 34. In this embodiment, the second housing 31 can be fixed to the outer side of the outer cover 11 where the through hole 3 is provided by bolts. The second housing 31 can be a hollow rectangular parallelepiped with two open sides, one of which is connected to the outer cover 11, and the other is adjacent to the movable arm body 22. Two baffles 311 are provided inside the second housing 31 along the direction of movement of the movable arm body 22. The two baffles 311 are arranged parallel to each other, and a second cavity 35 is formed between the two baffles 311 and the second housing 31. The friction block 32 and the push plate 33 are both installed in the second cavity 35. The provision of the baffles 311 can limit the movement of the friction block 32 within the second cavity 35, so that it only moves in a direction perpendicular to the side in contact with the movable arm body 22, thereby improving the stability of the friction block 32 during movement. The friction block 32 may be a rectangular parallelepiped structure, with one end of the friction block 32 extending out of the second cavity 35 and abutting against the outer side of the movable arm body 22. The push plate 33 is slidably mounted within the housing and is located on a side of the friction block 32 opposite the movable arm body 22. One end of the fastener 34 extends into the second cavity 35 and abuts against the push plate 33. The fastener 34 pushes the push plate 33 to abut the friction block 32 against the movable arm body 22. In actual operation, the position of the push plate 33 within the second housing 31 can be adjusted by the fastener 34. When the push plate 33 is located at different positions within the second housing 31, the friction force between the friction block 32 and the movable arm body 22 is also different. Therefore, the fastener 34 and the push plate 33 can act together on the friction block 32 to adjust the friction force between the friction block 32 and the movable arm body 22. In this embodiment, friction blocks 32 are provided on both sides of the movable arm body 22 . The friction blocks 32 can absorb the seismic energy transmitted from the movable arm body 22 , thereby effectively absorbing the energy of the seismic servo to maintain the stability of the building.

[0032] The fasteners 34 may be bolts.

[0033] In this embodiment, the friction between the friction block 32 and the movable arm body 22 can be adjusted using a bolt and push plate 33. When greater friction is required between the friction block 32 and the movable arm body 22, this can be achieved by tightening the bolt. When the bolt is tightened, it pushes the push plate 33, which in turn pushes the friction block 32, causing the friction block 32 to fit more tightly against the outside of the movable arm body 22, thereby increasing the friction between the friction block 32 and the movable arm body 22. Conversely, to reduce the friction between the friction block 32 and the movable arm body 22, simply loosen the bolt.

[0034] The friction block 32 can be made of a carbon fiber composite material with a ceramic spray coating on the surface. This material can improve the wear resistance and strength of the friction block 32 and extend its service life. The push plate 33 can be a steel plate, which can be sprayed with some wear-resistant material before use to improve its wear resistance.

[0035] In this embodiment, the friction dissipation assembly is connected to the outer housing 11 via a threaded connection. This connection facilitates disassembly and replacement of the friction dissipation assembly, allowing for replacement of individual components during use, thereby enhancing its practicality. Furthermore, the combination of the bolts and push plate 33 allows the friction force of the friction self-resetting SMA composite damper to be adjusted according to actual needs during use.

[0036] Please refer to Figure 2 and Figure 3 , the self-resetting component 1 includes a plurality of self-resetting parts 14, and the plurality of self-resetting parts 14 are evenly spaced around the central axis of the outer shell cover 11 in the longitudinal direction. The self-resetting component 2 includes a plurality of self-resetting parts 25, and the plurality of self-resetting parts are evenly spaced around the central axis of the outer shell cover 11 in the longitudinal direction. The number of self-resetting parts 14 and self-resetting parts 25 is the same. In this embodiment, the corresponding self-resetting parts 14 and self-resetting parts 25 in the longitudinal direction of the outer shell cover 11 are not on the same straight line. By making the positions of the self-resetting parts 14 and self-resetting parts 25 on the partition 21 dispersed and non-overlapping, the stability of the partition 21 sliding in the cavity can be further improved by using the plurality of self-resetting parts 14 and the plurality of self-resetting parts 25.

[0037] It can be understood that in this embodiment, the number of self-resetting parts 4 can be four, and the four self-resetting parts 4 are evenly distributed around the central axis of the outer shell cover 11 in the longitudinal direction. By setting four self-resetting parts 4, the damping effect of the self-resetting component 1 can be effectively improved.

[0038] Please refer to Figure 2 and Figure 6The self-resetting member 4 includes a spring 6 and an SMA metal rod 7. One end of the spring 6 is fixed to the shell plate 12, and the other end of the spring 6 is fixed to the partition plate 21. A through hole 1 is provided on the shell plate 12, and the through hole 1 is connected to the cavity. One end of the SMA metal rod 7 is fixed to the threaded hole of the partition plate 21 by a built-in bolt, and the other end of the SMA metal rod 7 is provided with a limit block 8, which is detachably connected to the SMA metal rod 7. The other end of the SMA metal rod 7 passes through the through hole 1 and is connected to the limit block 8. The limit block 8 is provided with a contact surface, which contacts the shell plate 12. The area of ​​the contact surface is larger than the area of ​​the through hole 1, so that the limit block 8 can limit the metal rod in the cavity. During actual operation, the SMA metal rod 7 can be limited in the cavity by the bolts and the limit blocks 8 provided by the SMA metal rod 7. At the same time, when the SMA metal rod 7 in this embodiment is pushed by the partition 21, it can extend out of the outside of the shell plate 12 through the through hole 1, so that the self-resetting part 14 will not bend when squeezed by the partition 21, thereby extending the service life of the SMA metal rod 7.

[0039] When the movable arm body 22 is vibrated, the movable arm body 22 will drive the partition 21 to move back and forth in the cavity. Figure 2 As shown, when diaphragm 21 moves leftward, spring 6 in self-reset assembly 1 compresses, pushing SMA rod 7 out of the plate through through-hole 1 due to the force of diaphragm 21. In self-reset assembly 2, spring 6 stretches, and SMA rod 7 deforms and lengthens under the pull of diaphragm 21. At this point, the combined elastic potential energy of spring 6 in both self-reset assemblies 1 and 2 and the shape memory effect of SMA rod 7 push diaphragm 21 rightward to its initial position, thereby damping the movement of movable arm 2.

[0040] The SMA metal rod 7 is made of a shape memory alloy SMA, which has ultra-high elasticity and shape memory effect, and can therefore be used as a good self-resetting material in the field of earthquake resistance. In this embodiment, a spring 6 is provided on the outside of the SMA metal rod 7. The spring 6 also has elasticity. The cooperation between the spring 6 and the SMA metal rod 7 can further enhance the reset capability of the entire friction self-resetting SMA composite damper. At the same time, the spring 6 can also provide lateral stiffness for the friction self-resetting SMA composite damper, so that the self-resetting component can maintain good self-resetting performance while also improving its overall stability. In addition, in this embodiment, by providing the spring 6 on the outside of the SMA metal rod 7, the spring 6 can also limit the SMA metal rod 7, thereby protecting the SMA metal rod 7. The coordinated provision of through-hole 1 ensures that even when push plate 33 exerts a significant thrust on self-resetting element 1 4 , SMA metal rod 7 can counteract this by extending the end of the stop plate outside shell 12 . This protects SMA metal rod 7 and effectively addresses the prior art issue of SMA metal rod 7 bending due to excessive force, resulting in its inability to reset. Furthermore, the dual effects of the elastic force of spring 6 and the exceptionally high shape memory effect of SMA metal rod 7 ensure that self-resetting element 1 4 exhibits excellent self-resetting properties, thereby rapidly pushing partition 21 to its initial position and damping the movement of movable arm body 22 .

[0041] Understandably, please refer to Figure 3 and Figure 5 The structure of self-resetting component 2 5 is identical to that of self-resetting component 1 4 , except that self-resetting component 2 5 is mounted on the other side of the partition 21, and one movable end of the SMA metal rod 7 in self-resetting component 2 5 extends out of the outer housing 11. Shell 2 31 is provided with a second through-hole 312, which is concentric with the first through-hole. The contact surface of the stopper 8 in self-resetting component 2 5 contacts the outer housing 11, with the area of ​​the contact surface being larger than the area of ​​the first through-hole and smaller than the area of ​​the second through-hole 312. This allows the SMA metal rod 7 in self-resetting component 2 located on the right side of the partition 21 to move along the outer side of the outer housing 11 toward the second through-hole 312. If the partition 21 is subjected to a large force from the movable arm body 22, the stopper 8 on the SMA metal rod 7 in self-resetting component 2 located on the right side of the partition 21 can extend out of the shell 31 through the second through-hole 312, thereby preventing the SMA metal rod 7 from bending.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A friction self-resetting SMA composite damper, characterized in that: It includes: The damper body comprises a shell (1), a self-resetting component (1), a self-resetting component (2) and a movable arm (2), wherein a cavity (13) is provided in the shell (1), and the movable arm (2) comprises a partition (21) and a movable arm body (22), wherein the partition (21) is slidably installed in the cavity, and one end of the movable arm body (22) passes through the shell (1) and is connected to the partition (21) in the cavity (13); the self-resetting component (1) and the self-resetting component (2) are arranged along the The length direction of the shell (1) is divided into two sides of the partition (21); one end of the self-resetting component (1) is fixed on the partition (21), and the other end is movably installed on the shell (1); one end of the self-resetting component (2) is fixed on the partition (21), and the other end is movably installed on the other side of the shell (1); the self-resetting component (1) and the self-resetting component (2) are used to reset the partition (21) to an initial position when the partition (21) moves in the cavity (13); and two friction energy consuming components, the two friction energy consuming components are symmetrically arranged on both sides of the movable arm body (22); the friction energy consuming components include a second shell (31), a friction block (32), a push plate (33) and at least one fastener (34), the second shell (31) is fixed to the side of the movable arm body (22) extending from the first shell (1), the second shell (31) is an open structure facing the movable arm body (22), the interior of the second shell (31) is provided with two baffles (311) in parallel along the moving direction of the movable arm body (22), and the two baffles (311) are in contact with the second shell (31). (31) to form a cavity 2 (35), the friction block (32) and the push plate (33) are both installed in the cavity 2 (35), one end of the friction block (32) extends out of the cavity 2 (35) and abuts against the outer side of the movable arm body (22), the push plate (33) is slidably installed in the cavity 2 (35) and is located on the side of the friction block (32) opposite to the movable arm body (22), one end of the fastener (34) extends into the cavity 2 (35) and abuts against the push plate (33), and the friction block (32) is abutted against the movable arm body (22) through the push plate (33).

2. The friction self-resetting SMA composite damper according to claim 1, characterized in that: The self-resetting component 1 includes a plurality of self-resetting parts 1 (4), and the plurality of self-resetting parts 1 (4) are distributed at equal intervals along the central axis of the shell 1 (1) in the longitudinal direction; the self-resetting component 2 includes a plurality of self-resetting parts 2 (5), and the plurality of self-resetting parts 2 (5) are distributed at equal intervals along the central axis of the shell 1 (1) in the longitudinal direction; the number of the self-resetting parts 2 (5) is the same as the number of the self-resetting parts 1 (4), and the corresponding self-resetting parts 1 (4) and the self-resetting parts 2 (5) in the longitudinal direction of the shell 1 (1) are not on the same straight line.

3. The friction self-resetting SMA composite damper according to claim 2, characterized in that: The self-resetting member (4) comprises an SMA metal rod (7) and a spring (6), one end of the spring (6) is fixed to the shell, and the other end is fixed to the partition (21); one end of the SMA metal rod (7) is fixed to the partition (21), and the other end passes through the shell (1) and abuts against the outer side surface of the shell (1).

4. The friction self-resetting SMA composite damper according to claim 3, characterized in that: One end of the SMA metal rod (7) is fixed to the partition (21) by a thread, and the other end of the SMA metal rod (7) is provided with a limit block (8), and the limit block (8) is arranged on the outside of the shell (1), and the shell (1) is provided with a through hole (1), and the through hole (1) is connected to the cavity (13), and the SMA metal rod (7) passes through the through hole (1) and is connected to the limit block (8); the limit block (8) is provided with a contact surface, and the contact surface is in contact with the shell (1), and the area of ​​the contact surface is larger than the area of ​​the through hole (1), and the limit block (8) is used to limit the SMA metal rod (7) in the cavity (13).

5. The friction self-resetting SMA composite damper according to claim 4, characterized in that: The second shell (31) is provided with a second through hole (312), the second through hole (312) and the first through hole are concentric holes, and the area of ​​the second through hole (312) is larger than the area of ​​the contact surface.

6. The friction self-resetting SMA composite damper according to claim 1, characterized in that: The shell body (1) includes an outer shell cover (11) and a shell plate (12), the outer shell cover (11) is provided with a through hole three and a through hole four along the length direction, the shell plate (12) is installed on the side of the outer shell cover (11) close to the through hole four, and the shell plate (12) and the outer shell cover (11) are surrounded by the cavity (13), and the area of ​​the through hole three is greater than or equal to the area of ​​the cross section of the movable arm body (22) along the length direction of the outer shell cover (11), so that the movable arm body (22) can pass through the through hole three and out of the outer shell cover (11).

7. The friction self-resetting SMA composite damper according to claim 6, characterized in that: At least one mounting plate 1 (121) is fixedly mounted on a side of the shell plate (12) away from the cavity 1 (13), and at least one mounting plate 2 (221) is fixedly mounted on an end of the movable arm body (22) away from the partition (21), and the friction self-resetting SMA composite damper is installed and fixed by the mounting plate 1 (121) and the mounting plate 2 (221).

8. The friction self-resetting SMA composite damper according to claim 1, characterized in that: There are multiple fasteners (34), and the multiple fasteners (34) are distributed at equal intervals along the central axis of the push plate (33) in the moving direction.

9. The friction self-resetting SMA composite damper according to claim 1, characterized in that: The fastener (34) is a bolt.

10. The friction self-resetting SMA composite damper according to claim 6, characterized in that: The contact surface between the partition plate (21) and the outer shell cover (11) is coated with lubricating oil.

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