Multi-stage sliding friction damper

Abstract

The present invention relates to a multi-stage sliding friction damper, comprising: a first end plate for installation on a main structure; a plurality of clamping plates with friction plates attached and arranged oppositely, one end of some of the clamping plates symmetrically arranged in the plurality of clamping plates is vertically fixed to the first end plate, and the remaining clamping plates are connected to the first end plate in a manner with adjustable distance through a first limiting structure; a second end plate for installation on the main structure and arranged oppositely to the first end plate; a plurality of core plates arranged oppositely, the core plates are inserted between two corresponding adjacent clamping plates, one end of some of the core plates symmetrically arranged in the plurality of core plates is vertically fixed to the second end plate, and the remaining core plates are connected to the second end plate in a manner with adjustable distance through a second limiting structure. The present invention utilizes the primary friction force and the secondary friction force generated successively to respectively respond to different types of earthquakes with different vibration magnitudes and directions.

Description

Technical Field

[0001] The invention relates to the field of dampers, in particular to a multi-stage sliding friction damper. Background Art

[0002] Friction damping uses the principle of tribology to dissipate the energy input into the structure due to vibration. In building structures, the use of friction dampers for shock absorption can effectively reduce the damage to building structures caused by earthquakes. A general friction damper includes a middle steel plate and pads on both sides, and energy is dissipated through friction between the steel plate and the pads.

[0003] However, in actual applications, the vibration magnitudes and directions of different types of earthquakes are different. A single friction damper is difficult to meet the shock absorption requirements of different types of earthquakes and has poor shock absorption performance. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a multi-stage sliding friction damper to solve the problem that a single friction damper in the prior art is difficult to meet the shock absorption requirements of different types of earthquakes.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a multi-stage sliding friction damper, comprising:

[0007] A first end plate for mounting on the main structure;

[0008] A plurality of clamping plates provided with friction plates and arranged opposite to each other, one end of some of the clamping plates symmetrically arranged among the plurality of clamping plates being vertically fixed to the first end plate, and the remaining clamping plates being connected to the first end plate via a first limiting structure in a manner in which the distance can be adjusted;

[0009] a second end plate for installation on the main structure and arranged opposite to the first end plate; and

[0010] Multiple core plates are arranged relatively to each other, and the core plates are inserted between two corresponding adjacent clamping plates. One end of some of the core plates that are symmetrically arranged among the multiple core plates is vertically fixed to the second end plate, and the remaining core plates are connected to the second end plate through a second limiting structure in a distance-adjustable manner.

[0011] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0012] There are three clamping plates, the long sides of the two clamping plates located on the outside are vertically fixed to the first end plate, and the clamping plate located on the inside is connected to the first end plate through the first limiting structure in a manner in which the distance can be adjusted;

[0013] There are two core plates, and the long sides of the two core plates are vertically fixed to the second end plate;

[0014] When the first end plate and the second end plate are relatively displaced, the first end plate drives the two clamping plates located on the outside and the corresponding core plate to first generate sliding friction to form a primary friction force;

[0015] After the inner clamping plate is limited by the first limiting structure, the inner clamping plate and the corresponding core plate generate sliding friction to form a secondary friction force.

[0016] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0017] The two clamping plates located on the outer sides are provided with first through holes;

[0018] The inner clamping plate is provided with a first limiting groove corresponding to the first through hole along the length direction;

[0019] The first limiting structure comprises:

[0020] A first bolt is passed through the first limiting groove and the first through hole; and a first nut is screwed on the first bolt, thereby limiting the connection of the plurality of clamping plates.

[0021] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0022] The first through hole is close to the first end plate, and a distance is left between the first through hole and the friction plate;

[0023] The first limiting groove is close to the first end plate, and a distance is left between the first limiting groove and the friction plate.

[0024] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0025] There are four clamping plates, the short sides of the two clamping plates located on the outside are vertically fixed to the first end plate, and the two clamping plates located on the inside are connected to the first end plate through the first limiting structure in a manner in which the distance can be adjusted;

[0026] There are three core plates, and the short sides of the three core plates are vertically fixed to the second end plate;

[0027] When the first end plate and the second end plate are relatively displaced, the first end plate drives the two clamping plates located on the outside and the corresponding core plate to first generate sliding friction to form a primary friction force;

[0028] After the inner clamping plate is limited by the first limiting structure, the two inner clamping plates and the corresponding core plates generate sliding friction to form a secondary friction force.

[0029] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0030] The two clamping plates located on the outer sides are provided with first through holes;

[0031] The inner clamping plate is provided with a first limiting groove corresponding to the first through hole along the length direction;

[0032] The first limiting structure comprises:

[0033] A first bolt is passed through the first limiting groove and the first through hole; and a first nut is screwed on the first bolt, thereby limiting and connecting the four clamping plates.

[0034] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0035] The first through hole is close to the first end plate, and a distance is left between the first through hole and the friction plate;

[0036] The first limiting groove is close to the first end plate, and a distance is left between the first limiting groove and the friction plate.

[0037] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0038] There are four clamping plates, and the short sides of the four clamping plates are vertically fixed to the first end plate;

[0039] There are three core plates, the short sides of the two core plates on the outside are vertically fixed to the second end plate, and the core plate on the inside is connected to the second end plate through the second limiting structure in a distance-adjustable manner;

[0040] When the first end plate and the second end plate are relatively displaced, the second end plate drives the two core plates and the corresponding clamping plates located on the outside to first generate sliding friction to form a primary friction force;

[0041] After the inner core plate is limited by the second limiting structure, the inner core plate and the corresponding clamping plate generate sliding friction to form a secondary friction force.

[0042] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0043] The two core plates located on the outer sides are provided with second through holes;

[0044] The core plate located on the inner side is provided with a second limiting groove corresponding to the second through hole along the length direction;

[0045] The second limiting structure comprises:

[0046] A second bolt is passed through the second limiting groove and the second through hole; and a second nut is screwed on the second bolt, thereby limiting the connection of the three core plates.

[0047] A further improvement of the multi-stage sliding friction damper of the present invention is that:

[0048] The length of the friction plates of the two outer clamping plates is shorter than the length of the friction plates of the inner clamping plates.

[0049] Beneficial effects of the multi-stage sliding friction damper of the present invention:

[0050] The present invention installs the damper in the main structure. When the first end plate and the second end plate are relatively displaced, the first end plate drives the outer splint to move, and the second end plate drives the corresponding core plate to move, so that the outer splint and the corresponding core plate first generate sliding friction to form a primary friction force; the inner splint slides with the core plate, and after the inner splint is limited by the first limiting structure, the inner splint and the corresponding core plate generate sliding friction to form a secondary friction force.

[0051] The present invention utilizes the first-order friction force and the second-order friction force generated successively to respectively respond to different types of earthquakes with different vibration magnitudes and directions, thereby solving the problem in the prior art that a single friction damper is difficult to meet the shock absorption requirements of different types of earthquakes. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a cross-sectional view of a first embodiment of the multi-stage sliding friction damper of the present invention.

[0053] Figure 2 This is a front view of the outer side clamping plate of the first embodiment of the multi-stage sliding friction damper of the present invention.

[0054] Figure 3 It is a front view of the inner clamping plate of the first embodiment of the multi-stage sliding friction damper of the present invention.

[0055] Figure 4 It is a front view of the core plate of the first embodiment of the multi-stage sliding friction damper of the present invention.

[0056] Figure 5 It is a cross-sectional view of a second embodiment of the multi-stage sliding friction damper of the present invention.

[0057] Figure 6 This is a front view of a clamping plate located on the outer side of a second embodiment of the multi-stage sliding friction damper of the present invention.

[0058] Figure 7 This is a front view of the inner clamping plate of the second embodiment of the multi-stage sliding friction damper of the present invention.

[0059] Figure 8It is a front view of the core plate of the second embodiment of the multi-stage sliding friction damper of the present invention.

[0060] Fig. 9 It is a cross-sectional view of a third embodiment of the multi-stage sliding friction damper of the present invention.

[0061] Fig.10 It is a front view of the core plate located on the outside of the third embodiment of the multi-stage sliding friction damper of the present invention.

[0062] Fig.11 It is a front view of the core plate located on the inner side of the third embodiment of the multi-stage sliding friction damper of the present invention.

[0063] Fig.12 It is a front view of a clamping plate of a third embodiment of the multi-stage sliding friction damper of the present invention. DETAILED DESCRIPTION

[0064] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0065] See also Figure 1 , showing Figure 1 It is a cross-sectional view of a first embodiment of the multi-stage sliding friction damper of the present invention. Figure 2 This is a front view of the outer side clamping plate of the first embodiment of the multi-stage sliding friction damper of the present invention. Figure 3 It is a front view of the inner clamping plate of the first embodiment of the multi-stage sliding friction damper of the present invention. Figure 4 This is a front view of the core plate of the first embodiment of the multi-stage sliding friction damper of the present invention. Figures 1 to 4 As shown, the multi-stage sliding friction damper of the present invention comprises:

[0066] A first end plate for mounting on the main structure;

[0067] A plurality of clamping plates are provided with friction plates and are arranged opposite to each other, one end of some of the clamping plates which are symmetrically arranged among the plurality of clamping plates is vertically fixed to the first end plate, and the remaining clamping plates are connected to the first end plate through a first limiting structure in a manner in which the distance can be adjusted;

[0068] a second end plate for mounting on the main structure and arranged opposite to the first end plate; and

[0069] Multiple core plates are arranged relatively to each other, and the core plates are inserted between two corresponding adjacent clamping plates. One end of some of the core plates that are symmetrically arranged among the multiple core plates is vertically fixed to the second end plate, and the remaining core plates are connected to the second end plate in a manner where the distance can be adjusted through the second limiting structure.

[0070] Combination Figures 1 to 4As shown, in the first embodiment, there are three splints (10, 11), the long sides of the two splints 10 located on the outside are vertically fixed to the first end plate 30, and the splint 11 located on the inside is connected to the first end plate 30 through the first limiting structure 50 in a distance-adjustable manner; the first limiting structure 50 makes the distance between the end of the splint 11 located on the inside and the first end plate 30 adjustable; there are two core plates 20, the long sides of the two core plates 20 are vertically fixed to the second end plate 40; when the first end plate 30 and the second end plate 40 are relatively displaced, the first end plate 30 drives the two splints 10 located on the outside and the corresponding core plate 20 to first generate sliding friction to form a primary friction force; after the splint 11 located on the inside is limited by the first limiting structure 50, the splint 11 located on the inside and the corresponding core plate 20 generate sliding friction to form a secondary friction force.

[0071] In the first embodiment, the combination Figure 2 and Figure 3 As shown, the two outer clamping plates 10 are provided with first through holes 100; the inner clamping plate 11 is provided with first limiting grooves 110 along the length direction; Figure 1 As shown, the first limiting structure 50 comprises: a first bolt passing through the first limiting groove 110 and the first through hole 100; and a first nut screwed on the first bolt, thereby limiting and connecting the plurality of clamping plates (10, 11).

[0072] In the first embodiment, the splint and the core plate are both rectangular parallelepiped plates, and the rectangular parallelepiped plates have long sides and short sides. The length direction of the splint is along the long side direction of the splint. The first end plate 30 is vertically fixed to the long side of the splint 10 located on the outside; the second end plate 40 is vertically fixed to the long side of the core plate 20.

[0073] Specifically, a plurality of first through holes 100 are spaced apart along the long side direction of the two outer clamps 10; the first limiting grooves 110 are oblong holes, and the oblong holes are spaced apart along the length direction of the inner clamp 11, so that adjacent clamps can move relative to each other along the length direction; a plurality of first limiting grooves 110 are spaced apart along the long side direction of the inner clamp 11.

[0074] Specifically, the first through hole 100 is a circular hole, and the inner diameter of the circular hole is adapted to the outer diameter of the first bolt; the first limiting groove 110 is an oblong hole, and the length of the oblong hole is much larger than the outer diameter of the first bolt. The first bolt can move relatively in the first limiting groove 110 of the inner clamping plate 11, and the first bolt and the outer clamping plate 10 move synchronously, so that the inner clamping plate 11 and the outer clamping plate 10 can move relatively.

[0075] The working principle of the first embodiment of the present invention is as follows: the invented damper is installed in the main structure, and when the first end plate 30 and the second end plate 40 are relatively displaced, the first end plate 30 drives the outer splint 10 to move, and the second end plate 40 drives the corresponding core plate 20 to move, so that the friction plate of the outer splint 10 and the corresponding core plate 20 first generate sliding friction to form a primary friction force; the inner splint slides with the core plate until the first bolt moves to the edge of the first limiting groove 110 and stops moving; after the inner splint 11 is limited by the first limiting structure 50, the friction plate of the inner splint 11 and the corresponding core plate 20 generate sliding friction to form a secondary friction force.

[0076] Furthermore, the present invention also includes a loading structure 70 connected to the clamping plates (10, 11) and the core plate 20, and the loading structure 70 corresponds to the position range of the friction plate, and a preload force is applied to the damper as a whole through the loading structure 70.

[0077] Specifically, the loading structure 70 includes: a high-strength bolt 71 vertically passing through the clamping plates (10, 11) and the core plate, a butterfly spring 72 and a gasket 73 sleeved on the high-strength bolt 71 and attached to the two clamping plates 10 located on the outside.

[0078] Combination Figure 2 and Figure 3 As shown, the first through hole 100 is close to the first end plate 30, and a gap is left between the first through hole 100 and the friction plate 60; the first limiting groove 110 is close to the first end plate 30, and a gap is left between the first limiting groove 110 and the friction plate 60. Multiple friction plates 60 are arranged at intervals along the long side and the short side of the clamping plate.

[0079] Furthermore, in order to avoid the appearance of cavities in the friction plate area after the inner splint moves during the first level of friction, within the range corresponding to the loading structure, the friction plate of the inner splint can be lengthened to avoid the appearance of cavities in the overlapping area of ​​the friction plates and uneven force on the friction plates.

[0080] The present invention also provides a second embodiment. Figure 5 It is a cross-sectional view of a second embodiment of the multi-stage sliding friction damper of the present invention. Figure 6 This is a front view of a clamping plate located on the outer side of a second embodiment of the multi-stage sliding friction damper of the present invention. Figure 7 This is a front view of the inner clamping plate of the second embodiment of the multi-stage sliding friction damper of the present invention. Figure 8 This is a front view of the core plate of the second embodiment of the multi-stage sliding friction damper of the present invention. Figures 5 to 8As shown, in the second embodiment, there are four clamping plates (10a, 11a), the short sides of the two clamping plates 10a located on the outside are vertically fixed to the first end plate 30a, and the two clamping plates 11a located on the inside are connected to the first end plate 30a through the first limiting structure 50a in a manner that the distance can be adjusted;

[0081] There are three core plates 20a, and the short sides of the three core plates 20a are vertically fixed to the second end plate 40a;

[0082] When the first end plate 30a and the second end plate 40a are displaced relative to each other, the first end plate 30a drives the two clamping plates 10a and the corresponding core plate 20a located on the outside to generate sliding friction to form a primary friction force;

[0083] After the inner clamping plate 11 a is limited by the first limiting structure 50 a , the two inner clamping plates 11 a and the corresponding core plate 20 a generate sliding friction to form a secondary friction force.

[0084] In the second embodiment, the two clamping plates 10a located on the outer side are provided with a first through hole 100a; the two clamping plates 11a located on the inner side are provided with a first limiting groove 110a along the length direction (short side); the first limiting structure 50a includes: a first bolt passing through the first limiting groove 110a and the first through hole 100a; and a first nut screwed on the first bolt, thereby limiting the connection of the four clamping plates (10a, 11a).

[0085] Specifically, the first through hole 100a is close to the first end plate 30a, and a distance is left between the first through hole 100a and the friction plate; the first limiting groove 110a is close to the first end plate 30a, and a distance is left between the first limiting groove 110a and the friction plate.

[0086] Specifically, the first through hole 100a is a circular hole, and the inner diameter of the circular hole is adapted to the outer diameter of the first bolt; the first limiting groove 110a is an oblong hole, and the length of the oblong hole is much larger than the outer diameter of the first bolt. The first bolt can move relatively in the first limiting groove 110a of the inner clamping plate 11a, and the first bolt and the outer clamping plate 10a move synchronously, so that the inner clamping plate 11a and the outer clamping plate 10a can move relatively.

[0087] In the second embodiment, the present invention further comprises a loading structure 70a connected to the clamping plate (10a, 11a) and the core plate 20a, wherein the loading structure 70a corresponds to the position range of the friction plate, and a preload force is applied to the damper as a whole through the loading structure 70a.

[0088] Specifically, the loading structure 70a includes: high-strength bolts 71a vertically passing through the clamping plates (10a, 11a) and the core plate, and butterfly springs 72a and gaskets 73a sleeved on the high-strength bolts 71a and attached to the two clamping plates located on the outside.

[0089] The second end plate 40a is fixedly connected to two core plates 20a located on the same plane, and the two core plates 20a are located on both sides of the high-strength bolt 71a. The two core plates 20a correspond to the friction plates arranged on the clamping plate respectively.

[0090] Furthermore, the length of the friction plate 60a of the outer clamping plate 10a is shorter than the length of the friction plate of the inner clamping plate 11a.

[0091] The working principle of the second embodiment of the present invention is as follows: the damper of the second embodiment is installed in the main structure, and when the first end plate 30a and the second end plate 40a are relatively displaced, the first end plate 30a drives the outer splint 10a to move, and the second end plate 40a drives the corresponding core plate 20a to move, so that the friction plate of the outer splint 10a and the corresponding core plate 20a first generate sliding friction to form a primary friction force; the inner splint slides with the core plate until the first bolt moves to the edge of the first limiting groove 110a and stops moving; after the inner splint 11a is limited by the first limiting structure 50a, the friction plate of the inner splint 11a and the corresponding core plate 20a generate sliding friction to form a secondary friction force.

[0092] The present invention also provides a third embodiment. Fig. 9 It is a cross-sectional view of a third embodiment of the multi-stage sliding friction damper of the present invention. Fig.10 It is a front view of the core plate located on the outside of the third embodiment of the multi-stage sliding friction damper of the present invention. Fig.11 It is a front view of the core plate located on the inner side of the third embodiment of the multi-stage sliding friction damper of the present invention. Fig.12 This is a front view of a clamping plate of a third embodiment of the multi-stage sliding friction damper of the present invention. Figures 9 to 12 As shown, there are four splints 10b, and the short sides of the four splints 10b are vertically fixed to the first end plate 30b; there are three core plates (20b, 21b), and the short sides of the two core plates 20b located on the outside are vertically fixed to the second end plate 40b, and the core plate 21b located on the inside is connected to the second end plate 40b in an adjustable distance manner through the second limiting structure 50b; when the first end plate 30b and the second end plate 40b are relatively displaced, the second end plate 40b drives the two core plates 20b located on the outside and the corresponding splints to first generate sliding friction to form a primary friction force; after the core plate located on the inside is limited by the second limiting structure 50b, the core plate 21b located on the inside and the corresponding splint 10b generate sliding friction to form a secondary friction force.

[0093] Furthermore, the two core plates 20b located on the outside are provided with a second through hole 200b; the core plate 21b located on the inside is provided with a second limiting groove 210b along the length direction; the second limiting structure 50b includes: a second bolt passing through the second limiting groove 210b and the second through hole 200b; and a second nut screwed on the second bolt, thereby limiting the connection of the three core plates.

[0094] Furthermore, the length of the friction plates of the two outer clamping plates 10 b is shorter than the length of the friction plates of the inner clamping plates 10 b.

[0095] Furthermore, the second through hole 200b is close to the second end plate 40b; and the second limiting groove 210b is close to the second end plate 40b.

[0096] In the third embodiment, the present invention further comprises a loading structure 70b connected to the clamping plate 10b and the core plate 20b, the loading structure 70b corresponds to the position range of the friction plate 60b, and a preload force is applied to the damper as a whole through the loading structure 70b.

[0097] Specifically, the loading structure 70b includes: a high-strength bolt 71b vertically passing through the clamping plate 10b and the core plate (20b, 21b), a butterfly spring 72b and a gasket 73b sleeved on the high-strength bolt 71b and attached to the two clamping plates 10b located on the outside.

[0098] The second end plate 40b is fixedly connected to two core plates 20b located in the same plane, and the two core plates 20b are located on both sides of the high-strength bolt 71b. The two core plates 20b correspond to the friction plates arranged on the clamping plate respectively.

[0099] Furthermore, the length of the friction plate 60b of the outer clamping plate 10b is shorter than the length of the friction plate of the inner clamping plate.

[0100] The working principle of the third embodiment of the present invention is as follows: the damper of the third embodiment is installed in the main structure, and when the first end plate 30b and the second end plate 40b are relatively displaced, the first end plate 30b drives the clamping plate 10b to move, and the second end plate 40b drives the core plate 20b located on the outside to move, so that the friction plate of the core plate 20b located on the outside and the corresponding clamping plate 10b first generate sliding friction to form a primary friction force; the core plate 21b located on the inside slides with the clamping plate until the second bolt moves to the edge of the second limiting groove 210b and stops moving; after the core plate 21b located on the inside is limited by the second limiting structure 50b, the friction plate of the core plate 21b located on the inside and the corresponding clamping plate generate sliding friction to form a secondary friction force.

[0101] The beneficial effects of the multi-stage sliding friction damper of the present invention are:

[0102] The present invention installs the damper in the main structure. When the first end plate and the second end plate are relatively displaced, the first end plate drives the outer clamping plate to move, and the second end plate drives the corresponding core plate to move, so that the outer clamping plate and the corresponding core plate first generate sliding friction to form a primary friction force; the inner clamping plate slides with the core plate, and after the inner clamping plate is limited by the first limiting structure, the inner clamping plate and the corresponding core plate generate sliding friction to form a secondary friction force. The present invention utilizes the primary friction force and the secondary friction force generated successively to respectively respond to different types of earthquakes with different vibration magnitudes and directions, thereby solving the problem that a single friction damper in the prior art is difficult to meet the shock absorption requirements of different types of earthquakes.

[0103] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A multi-stage sliding friction damper, characterized in that: include: A first end plate for mounting on the main structure; A plurality of clamping plates provided with friction plates and arranged opposite to each other, one end of some of the clamping plates symmetrically arranged among the plurality of clamping plates being vertically fixed to the first end plate, and the remaining clamping plates being connected to the first end plate via a first limiting structure in a manner in which the distance can be adjusted; A second end plate installed on the main structure and arranged opposite to the first end plate; and a plurality of core plates arranged opposite to each other, the core plates being inserted between two corresponding adjacent clamping plates, one end of some of the core plates arranged symmetrically among the plurality of core plates being vertically fixed to the second end plate, and the remaining core plates being connected to the second end plate in a manner of adjustable distance through a second limiting structure; wherein, When the first end plate and the second end plate are relatively displaced, the first end plate drives the clamping plate vertically fixed thereto to move, and the second end plate drives the core plate vertically fixed thereto to move, so that the clamping plate moving with the first end plate and the corresponding core plate first generate sliding friction to form a primary friction force; the clamping plate / core plate connected to the first end plate / second end plate in an adjustable distance manner slides with the core plate / clamping plate, and after being limited by the first limiting structure / second limiting structure, it generates sliding friction with the corresponding core plate / clamping plate to form a secondary friction force.

2. The multi-stage sliding friction damper according to claim 1, characterized in that: There are three clamping plates, the long sides of the two clamping plates located on the outside are vertically fixed to the first end plate, and the clamping plate located on the inside is connected to the first end plate through the first limiting structure in a manner in which the distance can be adjusted; There are two core plates, and the long sides of the two core plates are vertically fixed to the second end plate; When the first end plate and the second end plate are relatively displaced, the first end plate drives the two clamping plates located on the outside and the corresponding core plate to first generate sliding friction to form a primary friction force; After the inner clamping plate is limited by the first limiting structure, the inner clamping plate and the corresponding core plate generate sliding friction to form a secondary friction force.

3. The multi-stage sliding friction damper according to claim 2, characterized in that: The two clamping plates located on the outer sides are provided with first through holes; The inner clamping plate is provided with a first limiting groove corresponding to the first through hole along the length direction; The first limiting structure comprises: A first bolt is passed through the first limiting groove and the first through hole; and a first nut is screwed on the first bolt, thereby limiting the connection of the plurality of clamping plates.

4. The multi-stage sliding friction damper according to claim 3, characterized in that: The first through hole is close to the first end plate, and a distance is left between the first through hole and the friction plate; The first limiting groove is close to the first end plate, and a distance is left between the first limiting groove and the friction plate.

5. The multi-stage sliding friction damper according to claim 1, characterized in that: There are four clamping plates, the short sides of the two clamping plates located on the outside are vertically fixed to the first end plate, and the two clamping plates located on the inside are connected to the first end plate through the first limiting structure in a manner in which the distance can be adjusted; There are three core plates, and the short sides of the three core plates are vertically fixed to the second end plate; When the first end plate and the second end plate are relatively displaced, the first end plate drives the two clamping plates located on the outside and the corresponding core plate to first generate sliding friction to form a primary friction force; After the inner clamping plate is limited by the first limiting structure, the two inner clamping plates and the corresponding core plates generate sliding friction to form a secondary friction force.

6. The multi-stage sliding friction damper according to claim 5, characterized in that: The two clamping plates located on the outer sides are provided with first through holes; The inner clamping plate is provided with a first limiting groove corresponding to the first through hole along the length direction; The first limiting structure comprises: A first bolt is passed through the first limiting groove and the first through hole; and a first nut is screwed on the first bolt, thereby limiting and connecting the four clamping plates.

7. The multi-stage sliding friction damper according to claim 6, characterized in that: The first through hole is close to the first end plate, and a distance is left between the first through hole and the friction plate; The first limiting groove is close to the first end plate, and a distance is left between the first limiting groove and the friction plate.

8. The multi-stage sliding friction damper according to claim 1, characterized in that: There are four clamping plates, and the short sides of the four clamping plates are vertically fixed to the first end plate; There are three core plates, the short sides of the two core plates on the outside are vertically fixed to the second end plate, and the core plate on the inside is connected to the second end plate through the second limiting structure in a distance-adjustable manner; When the first end plate and the second end plate are relatively displaced, the second end plate drives the two core plates and the corresponding clamping plates located on the outside to first generate sliding friction to form a primary friction force; After the inner core plate is limited by the second limiting structure, the inner core plate and the corresponding clamping plate generate sliding friction to form a secondary friction force.

9. The multi-stage sliding friction damper according to claim 8, characterized in that: The two core plates located on the outer sides are provided with second through holes; The core plate located on the inner side is provided with a second limiting groove corresponding to the second through hole along the length direction; The second limiting structure comprises: A second bolt is passed through the second limiting groove and the second through hole; and a second nut is screwed on the second bolt, thereby limiting the connection of the three core plates.

10. The multi-stage sliding friction damper according to claim 1, characterized in that: The length of the friction plates of the two outer clamping plates is shorter than the length of the friction plates of the inner clamping plates.

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