A displacement-amplified self-centering friction damper

Abstract

The present invention relates to a displacement amplification type self-resetting friction damper, which converts the axial deformation of the damper into the rotation of the friction disk through gear transmission. The friction device rubs on the edge of the friction disk, thereby realizing the amplification of displacement, so as to reduce the need for friction force and extend the service life of the friction parts. At the same time, through gear transmission, the friction force provided by the friction device can increase with the increase of relative displacement, and can provide appropriate energy dissipation capacity under different working conditions. In addition, the device can automatically return to the initial state through the disc spring, and provide a certain self-resetting ability for the structure, which is beneficial to reduce the residual deformation of the structure under large earthquakes. Compared with the prior art, the present invention has good energy dissipation effect and is suitable for vibration control of engineering structures; the structure is stable and reliable and is not affected by the environment; it saves materials and reduces the consumption of friction plates; it is easy to maintain without dismantling the entire device.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration control of civil engineering structures, and in particular to a displacement-amplified self-centering friction damper. Background Art

[0002] Earthquakes are extremely destructive and difficult-to-predict natural disasters. Therefore, earthquake resistance fortification is an important part of structural design. Traditional structural design methods utilize the ductility of the structure itself to achieve the goal of "not collapsing in major earthquakes". This will cause serious damage and deformation of the structure under major earthquakes, and further result in relatively high post-earthquake repair costs, and even the entire structure being forced to be demolished. With the continuous improvement of people's requirements for the service life of structures, the probability of structures encountering earthquakes during their service period also increases accordingly, and the above problems have gradually received more and more attention.

[0003] To solve the above problems, one current solution is to install dampers in the structure to dissipate seismic energy through the dampers, thereby reducing the damage to the structure. Currently, the commonly used damper forms in engineering include tuned mass dampers, viscous dampers, metallic dampers, friction dampers, etc. However, the existing technologies often have the following problems:

[0004] 1. The principle is relatively complex. For example, for a tuned mass damper, its seismic reduction performance is affected by the dynamic characteristics of the structure and fluctuates greatly. For a metallic damper, it relies on the plastic deformation of the metal to dissipate energy, and the energy dissipation mechanism is complex.

[0005] 2. The mechanical properties are unstable. For example, for a viscous damper, its mechanical properties are unstable and often fluctuate greatly under environmental influences such as temperature changes.

[0006] 3. The maintenance cost is high. For example, for a metallic damper, after energy dissipation occurs, the energy-dissipating metal often has a certain amount of plastic deformation, which then involves problems such as evaluation and replacement, and the replacement of such dampers in engineering structures is often relatively complex.

[0007] In contrast, friction dampers have the characteristics of simple principle, stable and reliable, etc. However, due to the small deformation of building structures, friction dampers often require a large frictional force to achieve sufficient energy dissipation capacity, which in turn causes serious material wear and often requires frequent replacement.

[0008] Therefore, there is an urgent need to design a friction damper that can achieve good friction energy dissipation effect and extend the service life of friction parts. Summary of the Invention

[0009] The object of the present invention is to overcome the defects of the above-mentioned existing technologies and provide a displacement-amplified self-centering friction damper. By means of gear transmission, the axial deformation of the damper is converted into the rotation of the friction disk, so that the friction device performs friction at the edge of the friction disk, thereby realizing the amplification of displacement to reduce the need for friction force. At the same time, through gear transmission, the friction force provided by the friction device can increase with the increase of the relative displacement, which is beneficial to reducing the wear of the friction plates under normal use conditions, and the structure provides a certain self-centering ability through the disc spring, which is beneficial to reducing the residual deformation of the structure under large earthquakes.

[0010] The object of the present invention can be achieved by the following technical solutions:

[0011] The present invention provides a displacement-amplified self-centering friction damper, which includes a sleeve, a casing, a transmission device, a friction device and a self-centering device;

[0012] The sleeve includes an inner sleeve and an outer sleeve, and the outer sleeve and the inner sleeve are in an inserted nested structure;

[0013] One end of the casing is vertically fixed to the outside of the outer sleeve for accommodating a first disc spring, and the other end is provided with a thread;

[0014] One end of the outer sleeve and one end of the inner sleeve are each provided with a pull ring for connecting with an external structure;

[0015] Two racks are provided at the bottom of the inner sleeve, and the racks are used for meshing with the transmission device;

[0016] The transmission device includes a friction disk transmission gear, a winch transmission gear, a friction disk, a winch, a steel wire rope, a wire drum and a first end cap. The winch transmission gear, the friction disk transmission gear and the winch are all arranged inside the outer sleeve. The winch transmission gear and the winch are coaxially fixed, and the friction disk transmission gear and the friction disk are coaxially fixed;

[0017] One end of the first end cap is connected to the casing by a thread, and the other end is connected to the wire drum;

[0018] One end of the steel wire rope is connected to the winch, and the other end passes through the first hole on the outer sleeve into the casing, then into the first end cap and the wire drum, and the other end of the steel wire rope passing through the wire drum is connected to the friction device;

[0019] The friction device is fixed to the outside of the outer sleeve and close to the edge of the friction disk. The friction device includes a clamp arm, a friction plate, a connecting rod and a second disc spring. The friction plate and the second disc spring are both fixed on the clamp arm, and the clamp arm is connected to the connecting rod;

[0020] The self - resetting device includes a first disc spring, a first disc, and a first anchor. The steel strand passes through the centers of the first disc spring and the first disc, and the first disc is fixed on the steel strand by the first anchor after applying a certain pressure to the first disc spring;

[0021] When the inner sleeve and the outer sleeve move relative to each other in any direction, through the transmission device, driven by the rack, the friction disc rotates. At the same time, the relative displacement between the steel strand and the bobbin drives the friction device to press the friction plate against the edge of the friction disc, thereby realizing friction energy dissipation. Meanwhile, through the transmission ratio between the friction disc and the friction disc transmission gear, the relative displacement between the friction plate and the friction disc is greater than the relative displacement between the inner sleeve and the outer sleeve, realizing the amplification of displacement;

[0022] When the external force is removed, under the action of the first disc spring of the self - resetting device, the whole device can automatically return to the initial state, providing self - resetting ability.

[0023] Further, there are two clamping arm s in total. The two clamping arms are respectively arranged on both sides of the friction disc. There is a second hole in the center of the two clamping arms for the steel strand to pass through. The two clamping arms are respectively connected to the third bolt through two parallel connecting rods.

[0024] Further, the second disc spring consists of two identical disc springs, which are respectively arranged on one side of the clamping arm and in the center of the two clamping arms;

[0025] One end of the bobbin close to the friction device is connected to the second end cap. After the steel strand inside the bobbin passes through the second end cap, it successively passes through a second disc spring, one side of the clamping arm, another second disc spring, the other side of the clamping arm, a second disc, and a second anchor, and is fixed on the second disc.

[0026] Further, the connecting rod includes an upper connecting rod and a lower connecting rod. One end of the connecting rod is connected to the clamping arm through a rivet, and the other end is connected to the third bolt;

[0027] The upper connecting rod and the lower connecting rod are respectively fixedly connected to the outer sleeve through the third bolt;

[0028] The third bolt successively passes through the upper connecting rod, the steel sleeve, and the lower connecting rod, and is fixed to the outside of the outer sleeve through a third nut.

[0029] Further, on both sides of the outer sleeve, and at positions corresponding to the winch transmission gear, there are third holes for the first bolt to pass through;

[0030] There are two winch transmission gears arranged in series. There is a winch between the two winch transmission gears. The outer sleeve, the winch transmission gears, and the winch are fixedly connected through a first bolt group;

[0031] The first bolt group includes a first bolt and a first nut.

[0032] Further, elongated holes are provided on both the upper surface and the lower surface of the outer sleeve for the friction disc to pass through, and a fourth hole is provided at a position corresponding to the friction disc transmission gear on the outer sleeve for a second bolt to pass through;

[0033] There are two friction disc transmission gears, a friction disc is provided between the two friction disc transmission gears, and gaskets are provided on both sides of the friction disc;

[0034] The outer sleeve, the friction disc transmission gear, the friction disc and the gasket are fixedly connected by a second bolt group;

[0035] The second bolt group includes a second bolt and a second nut.

[0036] Further, direct meshing or multi-stage gears are used for transmission between the rack and the friction disc transmission gear to improve the displacement amplification effect and reduce the diameter of the friction disc.

[0037] Further, disc-shaped protrusions are provided on the inner sides of the first bolt group or the second bolt group to apply pressure to the parts, prevent relative sliding when the parts rotate, and at the same time ensure that the parts can freely rotate around the bolts.

[0038] Further, the height of the steel sleeve is the same as the distance between the upper connecting rod and the lower connecting rod;

[0039] A turning portion is provided at one end of the connecting rod close to the third bolt, and the turning portion is used to stagger the connection between the connecting rod and the third bolt.

[0040] Further, the friction plate is fixed to the inner side of the clamp arm and close to the edge of the friction disc, and the material of the friction plate is carbon fiber.

[0041] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0042] 1. Good energy consumption effect. By amplifying the displacement in the present invention, the frictional force can do work over a longer distance, so the energy consumption effect is better, and it is suitable for vibration control of engineering structures.

[0043] 2. Stable and reliable. The present invention dissipates energy through friction and is reset by a disc spring. The principle is simple and reliable, and the performance of the present invention is not affected by the environment, without relying on external factors, and has strong reliability.

[0044] 3. Material saving. The friction device in the present invention can provide appropriate energy consumption capacity under different working conditions, thereby reducing the loss of friction plates under normal use conditions.

[0045] 4. Easy to maintain. The friction plates and friction discs in the present invention can be directly replaced without removing the entire device, which is convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a top view of a displacement-amplified self-resetting friction damper;

[0047] Figure 2 It is a sectional view taken along line A-A of a displacement-amplified self-resetting friction damper;

[0048] Figure 3 It is a sectional view taken along line B-B of a displacement-amplified self-resetting friction damper;

[0049] Figure 4 It is a top view of the friction device in Embodiment 1;

[0050] Figure 5 It is a sectional view taken along line C-C of the friction device in Embodiment 1;

[0051] Figure 6 It is a side elevation view of the friction device in Embodiment 1;

[0052] Figure 7 It is a three-dimensional view of the connecting rod in Embodiment 1;

[0053] Figure 8 It is a partial enlarged view of the sleeve on the outer sleeve in Embodiment 1;

[0054] Figure 9 It is a sectional view at position D of the wire barrel in Embodiment 1;

[0055] Figure 10 It is a schematic structural view of the friction disc transmission gear of a displacement-amplified self-resetting friction damper using a multi-stage gear in Embodiment 1.

[0056] Figure 1 Description of the marks:

[0057] 1 - Outer sleeve, 2 - Inner sleeve, 2' - Rack, 5 - Steel strand, 9 - First end cap, 10 - Wire barrel, 11 - Friction device, 14 - First nut, 15 - First bolt, 16 - Second nut, 17 - Second bolt;

[0058] Figure 2 Description of the marks:

[0059] 1 - Outer sleeve, 2 - Inner sleeve, 2' - Rack, 3 - Winch, 4 - Winch drive gear, 5 - Steel strand, 6 - First disc spring, 7 - First disc, 8 - First anchor, 9 - First end cap, 10 - Bobbin, 11 - Friction device, 12 - Friction disc, 13 - Friction disc drive gear;

[0060] Figure 3 Marking description:

[0061] 1 - Outer sleeve, 2 - Inner sleeve, 2' - Rack, 3 - Winch, 4 - Winch drive gear, 12 - Friction disc, 13 - Friction disc drive gear; 14 - First nut, 15 - First bolt, 16 - Second nut, 17 - Second bolt, 18 - Gasket;

[0062] Figure 4 Marking description:

[0063] 5 - Steel strand, 10 - Bobbin, 12 - Friction disc, 1101 - Clamping arm, 1102 - Connecting rod, 1103 - Third bolt, 1105 - Second end cap, 1106 - Second disc spring, 1107 - Second disc, 1108 - Second anchor, 1109 - Friction plate, 1110 - Rivet;

[0064] Figure 5 Marking description:

[0065] 5 - Steel strand, 10 - Bobbin, 12 - Friction disc, 1101 - Clamping arm, 1102 - Connecting rod, 1103 - Third bolt, 1104 - Steel sleeve, 1105 - Second end cap, 1106 - Second disc spring, 1107 - Second disc, 1108 - Second anchor, 1109 - Friction plate;

[0066] Figure 6 Marking description:

[0067] 5 - Steel strand, 10 - Bobbin, 1101 - Clamping arm, 1102 - Connecting rod, 1103 - Third bolt, 1104 - Steel sleeve, 1105 - Second end cap, 1106 - Second disc spring, 1107 - Second disc, 1108 - Second anchor, 1110 - Rivet;

[0068] Figure 7 Marking description:

[0069] 1102 - Connecting rod;

[0070] Figure 8 Marking description:

[0071] 1 - Outer sleeve, 5 - Steel strand, 6 - First disc spring, 7 - First disc, 8 - First anchor, 9 - First end cap, 10 - Bobbin;

[0072] Figure 9 Marking description:

[0073] 5 - Steel strand, 10 - Bobbin;

[0074] Figure 10 Marking description:

[0075] 1 - Outer sleeve, 2' - Rack, 11 - Friction device, 12 - Friction disc, 13 - Friction disc drive gear, 17 - Second bolt, 19 - First - stage gear, 20 - Second - stage gear. Specific embodiments

[0076] The following describes the specific embodiments of the present invention in detail through examples. These examples are implemented on the premise of the solution described in the present invention, and the detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following examples.

[0077] The present invention will be further described below in conjunction with the drawings and specific embodiments. For the component models, material names, connection structures and other features not clearly described in this technical solution, they are all regarded as common technical features disclosed in the prior art. Embodiment 1

[0078] This embodiment provides a displacement - amplified self - reset friction damper, as Figure 1 and Figure 2 shown, including a sleeve, a casing, a transmission device, a friction device and a self - reset device.

[0079] The sleeve includes an outer sleeve 1 and an inner sleeve 2. The inner sleeve 2 and the outer sleeve 1 are in an insertion - type nested structure. One end of the outer sleeve 1 and one end of the inner sleeve 2 are respectively provided with pull rings for connecting with an external structure to reduce the adverse effect of the bending moment. The outer sleeve 1 is square, and long - strip holes are provided on the upper surface and the lower surface to accommodate the friction disc 12 to pass through. The inner sleeve 2 is square and can just be sleeved inside the outer sleeve 1. Two racks 2' are provided at the bottom of the inner sleeve 2, and a certain distance is spaced between the two racks 2' to accommodate the friction disc 12 to pass through. Third holes are provided on both sides of the outer sleeve 1 and at the position corresponding to the winch drive gear 4 for passing through the first bolt 15. Multiple - stage gears can be added between the rack 2' and the friction disc drive gear 13 for transmission to improve the displacement amplification effect and reduce the diameter of the friction disc 12, but it will increase the complexity of the device. As Figure 10 shown, a first - stage gear 19 and a second - stage gear 20 are added.

[0080] As Figure 2As shown, the sleeve is disposed outside the outer sleeve 1 and directly above the winch 3, and can accommodate the first disc spring 6. The top of the sleeve is threaded, and a fifth hole is provided at the center of its bottom for passing the steel strand 5. A chamfer is provided at the bottom of the fifth hole to reduce wear of the steel strand 5. As Figure 8 shown, the steel strand 5 starts from the winch 3, passes through the first hole on the outer sleeve 1, the first disc spring 6 and the first disc 7 inside the sleeve in sequence, and then is fixed to the first disc 7 by the first anchor 8, and a certain pre-pressure is applied to the first disc spring 6, and then passes through the first end cap 9 and the bobbin 10 fixed thereon. The first end cap 9 is fixed to the sleeve outside the outer sleeve 1 by threads, and a hexagonal protrusion is also provided on the sleeve for tightening the end cap. The steel strand 5 passes through the inside of the bobbin 10. As Figure 9 shown, the two can slide relative to each other. The other ends of the steel strand 5 and the bobbin 10 are connected to the friction device 11.

[0081] Figure 3 It is a B-B sectional view of a displacement-amplified self-resetting friction damper. As shown in the figure, the transmission device includes a friction disc transmission gear 13, a winch transmission gear 4, a friction disc 12, a winch 3, a steel strand 5, a bobbin 10 and a first end cap 9. The winch transmission gear 4, the friction disc transmission gear 13 and the winch 3 are all disposed inside the outer sleeve 1. The winch transmission gear 4 and the winch 3 are coaxially fixed, and the friction disc transmission gear 13 and the friction disc 12 are coaxially fixed.

[0082] One end of the first end cap 9 is connected to the sleeve by threads, and the other end is connected to the bobbin 10; one end of the steel strand 5 is connected to the winch 3, and the other end penetrates into the sleeve from the first hole on the outer sleeve 1, then penetrates into the first end cap 9 and the bobbin 10, and the other end of the steel strand 5 penetrating into the bobbin 10 is connected to the friction device 11.

[0083] There are two winch drive gears 4 in series. A winch 3 is provided between the two winch drive gears 4. The first bolt 15 passes through the outer sleeve 1, the winch drive gear 4 and the winch 3 and is tightened and fixed with the first nut 14. There are two friction disk drive gears 13. A friction disk 12 is provided between the two friction disk drive gears 13. Gaskets 18 are provided on both sides of the friction disk 12. The second bolt 17 passes through the outer sleeve 1, the friction disk drive gear 13, the friction disk 12 and the gasket 18 and is tightened and fixed with the second nut 16. Disk-shaped protrusions are provided on the inner sides of the second bolt 17, the second nut 16, the first bolt 15 and the first nut. The height of the protrusions is slightly greater than the wall thickness of the outer sleeve 1. The protrusions can apply an extrusion force to the internal parts to prevent relative sliding when the parts rotate, and at the same time can also ensure that the parts rotate around the bolt as the axis. The friction disk drive gear 13 and the winch drive gear 4 are engaged with the rack 2' of the inner sleeve 2. A steel wire rope 5 is fixed on the winch 3. In the initial state, the steel wire rope 5 passes through the center of the winch 3. After the device is installed, the first bolt 15 is tightened. When the winch 3 rotates in any direction, the steel wire rope 5 will be wound around the winch 3, thereby pulling the steel wire rope 5.

[0084] Figure 4 It is a top view of the friction device 11. Figure 6 It is a side elevation view of the friction device 11, as Figure 4 and 6 shown. The friction device 11 is fixed to the outside of the outer sleeve 1 and is close to the edge of the friction disk 12. The friction device 11 includes clamp arms 1101, friction plates 1109, connecting rods 1102 and second disc springs 1106. The friction plates 1109 and the second disc springs 1106 are both fixed on the clamp arms 1101. There are two clamp arms 1101 in total. The two clamp arms 1101 are respectively arranged on both sides of the friction disk 12. A second hole is provided in the center of the two clamp arms 1101 for the steel wire rope 5 to pass through, and they are respectively connected to the third bolt 1103 through two parallel connecting rods 1102.

[0085] As Figure 5 shown, the connecting rod 1102 includes an upper connecting rod and a lower connecting rod. One end of the connecting rod 1102 is connected to the clamp arm 1101 through a rivet 1110, and the other end is connected to the third bolt 1103. The upper connecting rod and the lower connecting rod are respectively fixedly connected to the outer sleeve 1 through the third bolt 1103. The third bolt 1103 passes through the upper connecting rod, the steel sleeve 1104 and the lower connecting rod in sequence and is fixed to the outside of the outer sleeve 1 through the third nut. The height of the steel sleeve 1104 is the same as the distance between the upper connecting rod and the lower connecting rod. One end of the connecting rod 1102 close to the third bolt 1103 is provided with a turning part, as Figure 7 shown. The turning part is used to stagger the connection part of the connecting rod 1102 and the third bolt 1103. The friction plate 1109 is fixed to the inner side of the clamp arm 1101 and is close to the edge of the friction disk 12. The material of the friction plate 1109 is carbon fiber.

[0086] The second disc spring 1106 consists of two identical disc springs, which are respectively arranged on one side of the clamp arm 1101 and at the center of the two clamp arms 1101; one end of the wire barrel 10 close to the friction device 11 is connected to the second end cap 1105. After the steel strand 5 inside the wire barrel 10 passes through the second end cap 1105, it successively passes through a second disc spring 1106, one side of the clamp arm 1101, the other second disc spring 1106, the other side of the clamp arm 1101, the second disc 1107 and the second anchor 1108 and is fixed on the second disc 1107. By tensioning the steel strand 5, relative inward movement occurs between the second end cap 1105 and the second disc 1107, thereby applying a pre-pressure to the two second disc springs 1106.

[0087] When relative movement occurs between the inner sleeve 2 and the outer sleeve 1 in any direction, driven by the rack 2' of the inner sleeve 2, the friction disc transmission gear 13 and the winch transmission gear 4 rotate. The friction disc transmission gear 13 drives the friction disc 12 to rotate, and the winch transmission gear 4 drives the winch 3 to pull the steel strand 5. The steel strand 5 drives the first disc 7 to compress the first disc spring 6. At the same time, the relative movement between the steel strand 5 and the wire barrel 10 causes the two second disc springs 1106 on the friction device 11 to be compressed tightly, and the friction plate 1109 is squeezed to the edge of the friction disc 12 through the clamp arm 1101 and a certain pressure is provided, and then frictional energy dissipation can occur.

[0088] Since the diameter of the friction disc 12 is larger than that of the friction disc transmission gear 13, through the transmission device, the relative displacement between the friction plate 1109 and the friction disc 12 is larger than the relative displacement between the inner sleeve 2 and the outer sleeve 1, so displacement amplification can be achieved. Since the frictional force has a longer displacement to do work, the effect of frictional energy dissipation of the device is better, and at the same time the need for frictional force is reduced, so the loss of the friction plate can be reduced. At the same time, as the relative displacement between the inner sleeve 2 and the outer sleeve 1 increases, the pre-pressure of the second disc spring 1106 also increases, and the pressure applied by the clamp arm 1101 to the friction plate 1109 also increases. Furthermore, the frictional force and energy dissipation capacity of the friction device are also greater. Thus, appropriate energy dissipation capacity can be provided under different working conditions, and excessive loss of friction materials under normal use can be reduced to a great extent. After the external force is removed, under the action of the first disc spring 6, the device can automatically return to the initial state, and this structure provides a certain self-resetting ability for the device under large earthquakes.

[0089] Since the friction plate 1109 is relatively easy to replace, the cost is reduced, and the friction is sufficient. The friction plate 1109 is made of a material with good friction performance, such as carbon fiber, while the friction disc 12 is made of a more wear-resistant material, such as alloy steel, to reduce the replacement frequency and achieve the full utilization of materials. When the friction disc 12 needs to be replaced, only the second bolt 17 and the second nut 16 need to be loosened, and the replacement can be completed without removing the entire device.

[0090] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A displacement-amplified self-centering friction damper, characterized in that It includes a sleeve, a casing, a transmission device, a friction device (11) and a self-resetting device; The sleeve includes an inner sleeve (2) and an outer sleeve (1), and the outer sleeve (1) and the inner sleeve (2) are in an inserted and nested structure; One end of the casing is vertically fixed to the outside of the outer sleeve (1) for accommodating a first disc spring (6), and the other end is provided with a thread; One end of the outer sleeve (1) and one end of the inner sleeve (2) are each provided with a pull ring for connecting with an external structure; Two racks (2') are provided at the bottom of the inner sleeve (2), and the racks (2') are used for meshing with the transmission device; The transmission device includes a friction disc transmission gear (13), a winch transmission gear (4), a friction disc (12), a winch (3), a steel wire rope (5), a wire drum (10) and a first end cap (9). The winch transmission gear (4), the friction disc transmission gear (13) and the winch (3) are all arranged inside the outer sleeve (1). The winch transmission gear (4) and the winch (3) are coaxially fixed, and the friction disc transmission gear (13) and the friction disc (12) are coaxially fixed; One end of the first end cap (9) is connected to the casing by a thread, and the other end is connected to the wire drum (10); One end of the steel wire rope (5) is connected to the winch (3), and the other end passes through a first hole on the outer sleeve (1) into the casing, then into the first end cap (9) and the wire drum (10). The other end of the steel wire rope (5) passing through the wire drum (10) is connected to the friction device (11); The friction device (11) is fixed to the outside of the outer sleeve (1) and near the edge of the friction disc (12). The friction device (11) includes a clamp arm (1101), a friction plate (1109), a connecting rod (1102) and a second disc spring (1106). The friction plate (1109) and the second disc spring (1106) are both fixed on the clamp arm (1101), and the clamp arm (1101) is connected to the connecting rod (1102); The self-resetting device includes a first disc spring (6), a first disc (7) and a first anchor (8). The steel wire rope (5) passes through the centers of the first disc spring (6) and the first disc (7). After applying a certain pressure to the first disc spring (6), the first disc (7) is fixed on the steel wire rope (5) by the first anchor (8); When the inner sleeve (2) and the outer sleeve (1) move relative to each other in any direction, through the transmission device, driven by the rack (2'), the friction disc (12) rotates. At the same time, the relative displacement between the steel wire rope (5) and the wire drum (10) drives the friction device (11) to press the friction plate (1109) against the edge of the friction disc (12), thereby realizing friction energy dissipation. At the same time, through the transmission ratio between the friction disc (12) and the friction disc transmission gear (13), the relative displacement between the friction plate (1109) and the friction disc (12) is greater than the relative displacement between the inner sleeve (2) and the outer sleeve (1), realizing the amplification of displacement; On both sides of the outer sleeve (1), and at positions corresponding to the winch drive gear (4), there are third holes for passing through the first bolt (15); Two winch drive gears (4) are arranged in series. A winch (3) is arranged between the two winch drive gears (4). The outer sleeve (1), the winch drive gear (4) and the winch (3) are fixedly connected by a first bolt group; Long strip holes are provided on both the upper surface and the lower surface of the outer sleeve (1) for the friction disc (12) to pass through. At a position corresponding to the friction disc drive gear (13) on the outer sleeve (1), there is a fourth hole for passing through the second bolt (17); Two friction disc drive gears (13) are provided. A friction disc (12) is arranged between the two friction disc drive gears (13). Gaskets (18) are provided on both sides of the friction disc (12); The outer sleeve (1), the friction disc drive gear (13), the friction disc (12) and the gasket (18) are fixedly connected by a second bolt group; Direct meshing or multi-stage gears are used for transmission between the rack (2') and the friction disc drive gear (13) to improve the displacement amplification effect and reduce the diameter of the friction disc (12).

2. A displacement-amplified self-resetting friction damper according to claim 1, wherein There are two clamp arms (1101) in total. The two clamp arms (1101) are respectively arranged on both sides of the friction disc (12). A second hole is provided in the center of the two clamp arms (1101) for the steel strand (5) to pass through. The two clamp arms (1101) are respectively connected to the third bolt (1103) through two parallel connecting rods (1102).

3. A displacement-amplified self-resetting friction damper according to claim 1, wherein The second disc springs (1106) are two identical disc springs, which are respectively arranged on one side of the clamp arm (1101) and in the center of the two clamp arms (1101); One end of the wire drum (10) close to the friction device (11) is connected to the second end cap (1105). After the steel strand (5) inside the wire drum (10) passes through the second end cap (1105), it sequentially passes through a second disc spring (1106), one side of the clamp arm (1101), another second disc spring (1106), the other side of the clamp arm (1101), the second disc (1107) and the second anchor (1108) and is fixed on the second disc (1107).

4. A displacement-amplified self-resetting friction damper according to claim 1, characterized in that, The connecting rod (1102) includes an upper connecting rod and a lower connecting rod. One end of the connecting rod (1102) is connected to the clamp arm (1101) through a rivet (1110), and the other end is connected to the third bolt (1103); The upper connecting rod and the lower connecting rod are respectively fixedly connected to the outer sleeve (1) through the third bolt (1103); The third bolt (1103) sequentially passes through the upper connecting rod, the steel sleeve (1104) and the lower connecting rod, and is fixed to the outside of the outer sleeve (1) through a third nut.

5. A displacement-amplified self-centering friction damper according to claim 4, characterized in that, The height of the steel sleeve (1104) is the same as the distance between the upper connecting rod and the lower connecting rod; One end of the connecting rod (1102) close to the third bolt (1103) is provided with a turning portion for staggering the connection between the connecting rod (1102) and the third bolt (1103).

6. The displacement amplification type self - reset friction damper according to claim 1, characterized in that, The friction plate (1109) is fixed to the inner side of the clamp arm (1101) and near the edge of the friction disc (12). The material of the friction plate (1109) is carbon fiber.

7. A displacement-amplified self-resetting friction damper according to claim 1, characterized in that, The first bolt group includes a first bolt (15) and a first nut (14); The second bolt group includes a second bolt (17) and a second nut (16).

8. A displacement-amplified self-resetting friction damper according to claim 1, characterized in that A disc-shaped protrusion is provided inside the first bolt group or the second bolt group for applying pressure to the parts to prevent relative sliding when the parts rotate, and at the same time ensuring that the parts can rotate freely around the bolt as the axis.

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