Tandem type self-resetting friction damper

Abstract

The utility model provides a tandem type self-resetting friction damper which comprises a cover plate, two sections of connecting protrusions are arranged on the surface of the cover plate; the surfaces of the two sides of the end center clamping plate are each provided with a connecting recess. The surfaces of the two sides of the middle center clamping plate are each provided with two sections of connecting recesses; the end center clamping plate and the middle center clamping plate are connected end to end, are of a sandwich structure and are located between the two cover plates. The two sections of connecting recesses of the single-side cover plate are respectively embedded into the connecting recesses of the end central clamping plates and one section of connecting recess of the middle central clamping plate in a sliding manner; the connecting protrusions are provided with through holes, the connecting recesses are provided with through grooves, SMA bolts penetrate through the through grooves and the through holes in the two sides, and the elastic connecting cover plates, the end center clamping plates and the middle center clamping plates are connected. Through the multiple middle center clamping plates, the deformation capacity generated by relative movement of the center clamping plates and the cover plate is improved, due to the fact that the length and the deformation capacity of the damper are improved, displacement of the damper cannot exceed the limit, and the problem that energy cannot be consumed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of building vibration reduction and isolation, in particular to a series-connected self-resetting friction damper. Background Art

[0002] Energy dissipation and shock absorption technology is an anti-seismic technology that installs dampers at specific locations of the structure to dissipate the seismic energy input into the structure through the energy dissipation effect of the dampers. Compared with other dampers, friction dampers are widely used due to their simple structure, easy installation, and high initial stiffness. Traditional friction dampers dissipate energy by generating relative displacement and friction work, and lack self-reset function, which makes traditional dampers have large residual deformation. The current mainstream solution is to provide damper restoring force through an inclined structure, but a single inclined damper often has small displacement and insufficient self-reset ability, and cannot dissipate energy and cannot completely self-reset in rare and extremely rare earthquakes.

[0003] Among the existing patent technologies, the Chinese patent CN111962698A published on November 20, 2020, discloses a self-resetting sliding friction damper based on SMA. The two movable center clamps on both sides of the cover plate are connected by SMA bolts to achieve the reset of the damper after energy consumption.

[0004] However, this type of existing patent technology only records that the energy dissipation and deformation effects are achieved by connecting the two end center clamps with a single cover plate. In rare or extremely rare earthquakes, since the movable range of the center clamp is small, a single damper may fail to dissipate energy due to excessive displacement, that is, the energy dissipation capacity is insufficient. Utility Model Content

[0005] The purpose of the utility model is to provide a series self-resetting friction damper, which can increase the movable space of the central clamping plate between the end plate platforms, and solve the problem that a single arc self-resetting damper cannot dissipate energy in rare or extremely rare earthquakes due to excessive displacement;

[0006] The utility model provides a series self-resetting friction damper, comprising: a cover plate, on the surface of which two sections of connecting protrusions are arranged; an end center clamping plate, on the surfaces of both sides of which a section of connecting recess is respectively arranged; a middle center clamping plate, on the surfaces of both sides of which two sections of connecting recess are respectively arranged; the end center clamping plate and the middle center clamping plate are connected end to end, forming a sandwich structure and being located between the two cover plates; the two sections of connecting recesses of the cover plate on one side can be slidably embedded in the connecting recess of the end center clamping plate and the section of connecting recess of the middle center clamping plate respectively; the connecting protrusion is provided with a through hole, the connecting recess is provided with a through groove, and the SMA bolt passes through the through groove and the through holes on both sides to elastically connect the cover plate, the end center clamping plate and the middle center clamping plate.

[0007] Furthermore, there are multiple middle center splints; two adjacent middle center splints are connected end to end to form a sandwich structure between the two cover plates; the two connecting recesses of the cover plate on one side can be slidably embedded in the adjacent connecting recesses of the adjacent middle center splints; the SMA bolts pass through the through groove and the through holes on both sides to elastically connect the cover plate and the adjacent middle center splints.

[0008] Furthermore, there is a gap between the two connecting protrusions on the cover plate, a gap is left between the adjacent end center clamping plates and the middle center clamping plates, or a gap is left between two adjacent middle center clamping plates.

[0009] Further, the SMA bolt can move in the through slot along the connection direction of the end center clamping plate and the middle center clamping plate.

[0010] Furthermore, the connecting protrusion is an arc surface, which is arranged on one side surface of the cover plate; and the other side surface of the cover plate is a plane.

[0011] Furthermore, the connecting recess is an arc surface matching the connecting protrusion; the connecting recess on the end center splint is arranged on both sides of one end of the end center splint; the connecting recess on the middle center splint is arranged on both sides of both ends of the middle center splint.

[0012] Furthermore, a connection structure is provided at one end of the end center clamping plate where no connection recess is provided.

[0013] Furthermore, a platform is provided between the two connecting recesses on the same surface of the middle center splint.

[0014] Furthermore, the height of the platform is equal to the height of the narrowest part of the groove.

[0015] Furthermore, a disc spring is provided between the SMA bolt and the cover plate plane.

[0016] The technical solution of the utility model increases the overall length of the damper and improves the deformation capacity caused by the relative movement of the center splint and the cover plate by connecting a plurality of middle center splints in series between the end center splints at both ends. In rare or extremely rare earthquakes, the damper will not be displaced beyond the limit due to the increase in the length and deformation capacity of the damper, thus avoiding the problem of being unable to consume energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 Exploded view of;

[0020] Figure 3 It is a structural schematic diagram of the SMA bolt containing a disc spring of the present invention;

[0021] Figure 4 It is a schematic diagram of the states of various parts of the damper of the present invention when it is under pressure;

[0022] Figure 5 It is a schematic diagram of the states of various parts of the damper of the present invention when it is reset;

[0023] Figure 6 It is a schematic diagram of the through slot and the SMA bolt when the damper of the present invention is under pressure;

[0024] Figure 7 It is a schematic diagram of the through slot and the SMA bolt when the damper of the present invention is reset;

[0025] Description of reference numerals:

[0026] 101-end center splint; 102-middle center splint; 103-connecting structure; 2-cover plate; 3-SMA bolt; 4-nut; 5-disc spring; 6-through slot; 7-through hole. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Example 1

[0031] like Figure 1-Figure 7 As shown, the utility model provides a series self-resetting friction damper, comprising: a cover plate 2, on the surface of which two sections of connecting protrusions are provided; an end center splint 101, on the surfaces of both sides of which a section of connecting recess is respectively provided; a middle center splint 102, on the surfaces of both sides of which two sections of connecting recess are respectively provided; the end center splint 101 and the middle center splint 102 are connected end to end, forming a sandwich structure and located between the two cover plates 2; the two sections of connecting recesses of the single-side cover plate 2 can be slidably embedded in the connecting recess of the end center splint 101 and a section of connecting recess of the middle center splint 102 respectively; a through hole 7 is provided on the connecting protrusion, and a through groove 6 is provided on the connecting recess, and the SMA bolt 3 passes through the through groove 6 and the through holes 7 on both sides to elastically connect the cover plate 2, the end center splint 101 and the middle center splint 102.

[0032] Specifically, the widths of the cover plate 2 , the end center clamping plate 101 , and the middle center clamping plate 102 are all equal, and are all cut and assembled from steel plates of equal thickness.

[0033] The end center clamping plate 101 is formed by cutting a connecting protrusion on each upper and lower surface of a flat plate to form a connecting recess, and the middle center clamping plate 102 is formed by cutting two connecting protrusions on each upper and lower surface of a flat plate to form a connecting recess, and a through groove 6 is processed in the connecting recess, and its width is equal to the screw diameter of the SMA bolt 3 containing the disc spring 5, and its length is determined according to the friction energy required in the actual installation area of ​​the damper.

[0034] The cover plate 2 is composed of two connecting protrusions and a rectangular parallelepiped, one side of which is flat and the other side is M-shaped; a pair of circular through holes 7 are respectively processed on the connecting protrusions on both sides, and their width is equal to the screw diameter of the SMA bolt 3 containing the disc spring 5; the SMA bolt 3 containing the disc spring 5 is screwed on the end through the circular through hole 7 and the through groove 6 and the nut 4, connecting the cover plate 2 with the end center clamping plate 101-the middle center clamping plate 102-the end center clamping plate 101, forming a single arc surface self-resetting friction damper with a sandwich structure.

[0035] No matter the damper is in a compression state or a tension state, the SMA bolt 3 is in a tension state and provides a restoring force to the damper.

[0036] During the deformation process of the series self-resetting friction damper, except for the SMA bolt 3, all other components are in the elastic stage, so that there will be no residual deformation of the damper during loading and unloading; the energy dissipation of the damper is composed of the friction energy between the arc surfaces and the deformation energy of the SMA bolt 3, and it has a higher energy dissipation capacity than traditional dampers.

[0037] The series self-resetting friction damper does not need to apply pre-tightening force. Once subjected to external force, the central clamping plate will be displaced, generating friction energy consumption and causing the SMA bolt 3 to be tensilely deformed and dissipate energy, thus preventing the cover plate 2 from being in a pre-tightened state for a long time.

[0038] Shape memory alloy (SMA) has shape memory effect and superelastic effect, and has the ability to self-reset after deformation and energy consumption. It has been mentioned a lot in the prior art and is common knowledge in the field, so its principle will not be described in detail.

[0039] Example 2

[0040] There are multiple middle center splints 102; two adjacent middle center splints 102 are connected end to end to form a sandwich structure between two cover plates 2; the two connecting recesses of the single-side cover plate 2 can be slidably embedded in the adjacent connecting recesses of the adjacent middle center splints 102; the SMA bolts 3 pass through the through grooves 6 and the through holes 7 on both sides to elastically connect the cover plates 2 and the adjacent middle center splints 102.

[0041] Specifically, during assembly, the adjacent end connection recesses of the end center clamping plate 101 and the middle center clamping plate 102 are connected to the two connection protrusions of a cover plate 2; the adjacent end connection recesses of the adjacent middle center clamping plates 102 are connected to the two connection protrusions of a cover plate 2; the middle center clamping plates 102 are repeatedly connected to the two end center clamping plates 101, so that multiple sandwich-shaped arc surface self-resetting friction dampers are connected in series. The number of the middle center clamping plates 102 connected in series is determined according to the friction energy required in the actual installation area of ​​the damper.

[0042] The series self-resetting friction damper increases the movable space of the center clamping plate between the end plate platforms by connecting multiple middle center clamping plates 102 in series, thereby solving the problem that a single curved surface self-resetting damper cannot dissipate energy in rare or extremely rare earthquakes due to excessive displacement.

[0043] Example 3

[0044] There is a gap between the two connecting protrusions on the cover plate 2, a gap between the adjacent end center clamping plates 101 and the middle center clamping plates 102, or a gap between two adjacent middle center clamping plates 102. The SMA bolt 3 can move in the through slot 6 along the connection direction of the end center clamping plates 101 and the middle center clamping plates 102.

[0045] Specifically, there is a gap between the two connecting protrusions on the cover plate 2. The gap is determined based on the friction energy required in the actual installation area of ​​the damper. The gap is mainly used to allow the length of two adjacent center plates to be close to each other, which is a factor that affects the deformation capacity of the damper.

[0046] The gap between the center clamping plates is actually affected by the distance between the two connecting protrusions on the cover plate 2 .

[0047] Example 3

[0048] The connecting protrusion is an arc surface, which is arranged on one side surface of the cover plate 2; the other side surface of the cover plate 2 is a plane. The connecting recess is an arc surface matching the connecting protrusion; the connecting recess on the end center splint 101 is arranged on both sides of one end of the end center splint 101; the connecting recess on the middle center splint 102 is arranged on both sides of both ends of the middle center splint 102. A connecting structure 103 is arranged at one end of the end center splint 101 where the connecting recess is not arranged. A platform is arranged between the two connecting recesses on the same surface of the middle center splint 102, and the height of the platform is equal to the height of the narrowest part of the groove.

[0049] Specifically, a platform is provided between the two connecting depressions on the same surface of the middle center plywood 102, and the platform affects the overall length of the damper. Since the platform connecting the depressions is the smallest thickness of the middle center plywood 102, setting them to the same height can prevent uneven force when under pressure, which causes damage first at the thinnest part. The cover plate 2 is a single-sided M-shaped structure, and its two peaks are connecting protrusions. One end of the end center plywood 101 is a connecting depression, and the other end is a connecting structure 103 such as a hook and loop, which is used as the two connecting ends of the damper to connect different locations of different buildings respectively. Both ends of the middle center plywood 102 are connecting depressions, which play a series role.

[0050] Example 4

[0051] A disc spring 5 is provided between the SMA bolt 3 and the plane of the cover plate 2 .

[0052] Specifically, a disc spring 5 is added to the contact surface between the SMA bolt 3 and the cover plate 2 so that the disc spring 5 squeezes the end plate, and the SMA bolt 3 including the disc spring 5 is reset to the middle position of the through groove 6, further enhancing the self-resetting function of the damper.

[0053] Working mode and principle of this utility model:

[0054] like Figure 4-7 As shown, taking the damper under pressure as an example:

[0055] Initially, the M-shaped connection protrusions of the end plates are exactly matched with the connection depressions at both ends of the center clamping plate, and the SMA bolt 3 containing the disc spring 5 has no deformation and is located in the middle of the through slot 6;

[0056] When subjected to pressure, the center clamp at the outermost end slides inward, and the M-shaped connecting protrusion of the end plate and the connecting depression at both ends of the center clamp are displaced, generating friction energy consumption. At this time, the end plate does not move in the horizontal position, but opens outward in the vertical direction, thereby causing the SMA bolt 3 containing the disc spring 5 to be pulled, generating deformation energy consumption and providing restoring force for the damper. The pressure is transmitted inward through the center clamps at both ends, driving the series-connected multiple arc-surface self-resetting friction dampers to generate displacement and energy consumption; at the same time, the SMA bolt 3 containing the disc spring 5 begins to move toward the edge of the through groove 6; as the center clamp continues to move, the SMA bolt 3 containing the disc spring 5 hits the through groove 6, and the SMA bolt 3 containing the disc spring 5 stops moving; during this period, the tensile deformation of the SMA bolt 3 containing the disc spring 5 in the vertical direction increases, and the restoring force provided to the damper continues to increase, and the restoring force provided to the damper reaches the maximum value, and the squeezing of the disc spring 5 on the end plate will cause the SMA bolt 3 containing the disc spring 5 to reset to the middle position of the through groove 6.

[0057] When the damper is in tension, the center plate is stretched outward, the end plates are opened, and the SMA bolt 3 containing the disc spring 5 is stretched and elongated. After the tension disappears, the SMA bolt 3 is reset, and the process is not repeated here.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A series self-resetting friction damper, characterized in that: include: A cover plate, with two connecting protrusions on the surface; The end center splint has a connecting recess on both sides of the surface; The central splint in the middle has two connecting recesses on the surfaces of both sides; The end center splint and the middle center splint are connected end to end, forming a sandwich structure and located between the two cover plates; the two connecting recesses of the cover plate on one side can be slidably embedded in the connecting recess of the end center splint and the connecting recess of the middle center splint respectively; The connecting protrusion is provided with a through hole, the connecting recess is provided with a through slot, and the SMA bolt passes through the through slot and the through holes on both sides to elastically connect the cover plate, the end center clamping plate and the middle center clamping plate.

2. The series self-resetting friction damper according to claim 1 is characterized in that: The number of the middle center splints is multiple; Two adjacent middle center clamps are connected end to end to form a sandwich structure between the two cover plates; the two connecting recesses of the cover plate on one side can be slidably embedded in the adjacent connecting recesses of the adjacent middle center clamps; The SMA bolt passes through the through slot and the through holes on both sides to elastically connect the cover plate and the adjacent middle center clamping plate.

3. The series self-resetting friction damper according to claim 2 is characterized in that: There is a gap between the two connecting protrusions on the cover plate, a gap is left between the adjacent end center clamping plates and the middle center clamping plates, or a gap is left between two adjacent middle center clamping plates.

4. The series self-resetting friction damper according to claim 2, characterized in that: The SMA bolt can move in the through slot along a connection direction of the end center clamping plate and the middle center clamping plate.

5. The series self-resetting friction damper according to claim 1, characterized in that: The connecting protrusion is an arc surface, and is arranged on one side surface of the cover plate; the other side surface of the cover plate is a plane.

6. The series self-resetting friction damper according to claim 5, characterized in that: The connecting depression is an arc surface matching the connecting protrusion; The connecting recess on the end center splint is arranged on both sides of one end of the end center splint; The connection recesses on the middle center splint are arranged on both ends and both sides of the middle center splint.

7. The series self-resetting friction damper according to claim 6, characterized in that: The end of the end center clamping plate where the connection recess is not provided is provided with a connection structure.

8. The series self-resetting friction damper according to claim 6, characterized in that: A platform is provided between the two connecting recesses on the same surface of the middle center splint.

9. The series self-resetting friction damper according to claim 8, characterized in that: The platform height is equal to the height of the narrowest part of the groove.

10. The series self-resetting friction damper according to claim 1, characterized in that: A disc spring is arranged between the SMA bolt and the cover plate plane.

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