A self-resetting friction damper

Abstract

The present invention relates to a self-resetting friction damper, comprising a cylinder, one end of which is fixed with a first ear plate, and the other end of which is slidably connected with a second ear plate, and also comprising a friction elastic member and a limit assembly placed in the cylinder, wherein the friction elastic member is located between the inner wall of the cylinder and the limit assembly and is in close contact with the inner wall of the cylinder and the limit assembly, and the limit assembly comprises a first limit member and a second limit member, wherein the first limit member abuts against the first ear plate through the elastic force of the friction elastic member, and the second limit member moves with the second ear plate and applies force to the friction elastic member. Compared with the prior art, the space occupied by the damper can be significantly reduced while the energy consumption of the damper is enhanced, and the inner and outer buckling of the friction elastic member can be restrained at the same time, thereby preventing large deformation of the friction elastic member.

Description

Technical Field

[0001] The invention relates to the field of anti-vibration of building structures, and in particular to a self-resetting friction damper. Background Art

[0002] Earthquakes are one of the most widespread natural disasters, causing widespread impacts around the world, especially on building structures. Applying energy dissipation and shock absorption components to building structures will significantly increase the seismic performance of the structure. Common energy dissipation and shock absorption control methods include passive control, semi-active control and active control. Passive control methods are widely used due to their low manufacturing and maintenance costs. In recent years, the need for structures with recoverable functions has increased, and most of the existing passive control devices, whether friction dampers, metal dampers, viscous dampers or viscoelastic dampers, have no self-reset capability or low self-reset capability, poor durability, and high maintenance costs, which limit the use of passive control devices for structural vibration. The existing prestressed tendons have insufficient ultimate elastic deformation capacity or shape memory alloys are greatly affected by temperature.

[0003] In friction dampers with self-resetting capability, the current problems are: usually the self-resetting member and the friction member are installed separately, it is difficult to achieve the expected self-resetting result and energy consumption level within a limited space, and the buckling of the self-resetting member cannot be prevented well. Summary of the invention

[0004] The purpose of the present invention is to provide a self-resetting friction damper in order to overcome the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A self-resetting friction damper comprises a cylinder, one end of which is fixed with a first ear plate, and the other end of which is slidably connected with a second ear plate, and also comprises a friction elastic member and a limit assembly disposed in the cylinder, wherein the friction elastic member is located between the inner wall of the cylinder and the limit assembly and is in close contact with the inner wall of the cylinder and the limit assembly, wherein the limit assembly comprises a first limit member and a second limit member, wherein the first limit member supports the first ear plate through the elastic force of the friction elastic member, and the second limit member moves with the second ear plate and applies force to the friction elastic member.

[0007] The first limiting member is a U-section limiting member, and the second limiting member is a U-section limiting member. The open end of the U-section limiting member is folded outward to form a folding area. The folding area of ​​the first limiting member is supported against the first ear plate by one end of the friction elastic member, and the other end of the friction elastic member is supported against the folding area of ​​the second limiting member.

[0008] The first limit member is provided with a first through hole, the second limit member is provided with a second through hole, the second ear plate is fixed to the central axis, the central axis passes through the cylinder, the second through hole and the first through hole in sequence, and the cross-sectional area of ​​the end of the central axis is larger than the first through hole.

[0009] The second ear plate is connected to the central axis via threads, and the first ear plate is connected to the open end of the cylinder via threads.

[0010] The friction elastic member is a 60Si2Mn alloy friction elastic member, and the central axis is a 38CrMoAl alloy central axis.

[0011] The friction elastic member comprises two layers, namely an inner ring and an outer ring.

[0012] The surfaces of the friction elastic member, the limiting assembly and the second ear plate are coated with an anti-rust layer.

[0013] The cylinder body is a Q345 steel cylinder body, the first ear plate is a Q345 steel first ear plate, the second ear plate is a Q345 steel second ear plate, and the limiting assembly is a Q345 steel limiting assembly.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] (1) The friction elastic member is located between the inner wall of the cylinder and the limit assembly and is in close contact with the inner wall and the limit assembly. The friction elastic member acts as both a self-resetting member and a friction member and provides elastic damping. It has multiple effects in one and can significantly reduce the space occupied by the damper while enhancing the energy consumption of the damper. It also has self-resetting capability. A limit assembly is provided so that the two sides of the friction elastic member are respectively in close contact with the inner wall and the limit assembly, which can simultaneously constrain the inward and outward buckling of the friction elastic member, thereby preventing large deformation of the friction elastic member and giving it better self-resetting capability.

[0016] (2) The cross-sectional area of ​​the end of the central shaft is larger than that of the first through hole. This structure serves to limit the central shaft so that the sliding part composed of the central shaft and the second ear plate will not separate from the cylinder.

[0017] (3) The first ear plate is connected to the open end of the cylinder by a thread, and a preload force can be applied to the friction elastic member from one end. The second ear plate is connected to the central axis by a thread, and the second ear plate drives the second limit member to apply a preload force to the other end of the friction elastic member. The two parts have the function of applying a preload force at the same time, which can reduce the requirements for the preload force applying equipment and convert the preload force directly applied to the friction elastic member into a torsional force. The construction process is simple and the cost is low.

[0018] (4) The friction elastic member includes an inner ring and an outer ring, which can increase elastic damping.

[0019] (5) The surfaces of the friction elastic member, the limit assembly and the second ear plate are coated with an anti-rust layer to prevent water and oxygen from corroding the inside of the damper during the use of the building, and to prevent the friction contact surface from sticking due to "cold welding" caused by long-term contact.

[0020] (6) Adjustable damping: The friction between the friction elastic member and the inner wall of the cylinder, as well as the friction between the friction elastic member and the limit assembly can be achieved by reasonably reducing the inner diameter of the cylinder and increasing the outer diameter of the limit assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention;

[0022] Figure 2 It is a front elevation view of the present invention;

[0023] Figure 3 is a side elevation view of the present invention;

[0024] Figure 4 A top view of the present invention;

[0025] Figure 5 It is the AA cross-sectional view of the present invention;

[0026] Figure 6 It is the BB cross-sectional view of the present invention;

[0027] Figure 7 It is a CC cross-sectional view of the present invention;

[0028] Figure 8 It is a DD cross-sectional view of the present invention;

[0029] Fig. 9 It is a schematic diagram of applying the preload force of the present invention;

[0030] Reference numerals:

[0031] 1 is a friction elastic member; 2 is a folding area; 3 is a second limiting member; 4 is a first limiting member; 5 is a central axis; 6 is a cylinder; 7 is a second ear plate; 8 is a first ear plate; and 9 is an end of the central axis. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0033] Example

[0034] This embodiment provides a self-resetting friction damper that can be used for earthquake and wind resistance in various structural types such as buildings, bridges, structures, etc. It includes a cylinder 6, one end of which is fixed with a first ear plate 8, and the other end of which is slidably connected with a second ear plate 7, and also includes a friction elastic member 1 and a limit assembly placed in the cylinder 6, the friction elastic member 1 is located between the inner wall of the cylinder 6 and the limit assembly and is close to the inner wall of the cylinder 6 and the limit assembly, the limit assembly includes a first limit member 4 and a second limit member 3, the first limit member 4 supports the first ear plate 8 through the elastic force of the friction elastic member 1, and the second limit member 3 moves with the second ear plate 7 and applies force to the friction elastic member 1; the inner wall of the cylinder constrains the outward bending deformation of the friction elastic member under the action of the external load, and the outer wall of the limit assembly constrains the inward bending deformation of the friction elastic member, thereby preventing a large deformation of the friction elastic member and giving it a better self-resetting ability; the friction elastic member acts as a self-resetting member and a friction member at the same time, and provides elastic damping, with multiple effects in one, which can significantly reduce the space occupied by the damper while enhancing the energy consumption of the damper.

[0035] Specifically:

[0036] The first limiting member 4 is a U-section limiting member, and the second limiting member 3 is a U-section limiting member. The open end of the U-section limiting member is folded outward to form a folding area 2. The folding area 2 of the first limiting member 4 is against the first ear plate 8 through one end of the friction elastic member 1, and the other end of the friction elastic member 1 is against the folding area 2 of the second limiting member 3.

[0037] The first limit member 4 is provided with a first through hole, the second limit member 3 is provided with a second through hole, the second ear plate 7 is fixed to the central axis 5, the central axis 5 passes through the cylinder 6, the second through hole and the first through hole in sequence, and the cross-sectional area of ​​the end 9 of the central axis is larger than that of the first through hole.

[0038] The first ear plate 8 is connected to the cylinder 6 by means of threads or welding after thread connection, the second ear plate 7 is connected to the central axis 5 by means of threads, both ends of the cylinder 6 are regular hexagonal ends, and a pre-tightening force is applied to the damper by tightening the first ear plate 8 and the second ear plate 7; the two parts having the function of applying pre-tightening force at the same time can reduce the requirements for the pre-tightening force applying equipment, and the construction process is simple and the cost is low.

[0039] The cross section of the end 9 of the central axis is a regular hexagon, the friction elastic member 1 is a friction spring, the friction elastic member 1 includes an inner ring and an outer ring, which can increase elastic damping, and the cylinder 6 is a cylinder 6 with a U-shaped cross section.

[0040] The recommended material for the center shaft 5 is 38CrMoAl alloy, the recommended material for the friction elastic member 1 is 60Si2Mn alloy, and the recommended material for other components is Q345 steel.

[0041] The cavity between the first limiting member 4 and the second limiting member 3 is the tensile stroke of the damper, which can be adjusted according to design requirements, and this space plays a limiting role to protect the structure from excessive deformation.

[0042] The distance between the second ear plate 7 and the cylinder 6 is the compression stroke, which can be adjusted according to design requirements, and this distance plays a limiting role to protect the structure from excessive deformation.

[0043] The self-resetting preload of the damper is achieved by applying external torsion force between the cylinder 6 and the first ear plate 8, the central axis 5 and the second ear plate 7, until the second ear plate 7 and the central axis 5 are twisted to a preset thread position, and the first ear plate 8 and the cylinder 6 reach a preset thread position. The traditional preload application method is to directly apply external force to the friction spring to achieve a preset displacement or load, which is inconvenient to construct and has low production efficiency. Compared with the traditional method, the damper construction process of this embodiment is simple.

[0044] The surfaces of the central shaft 5, the friction elastic member 1, the limit assembly and the second ear plate 7 are coated with an anti-rust layer, which is a rust-proof high friction coefficient liquid or semi-solid paste material to prevent water and oxygen from rusting the inside of the damper during the use of the building, and the friction contact surface from sticking due to "cold welding" caused by long-term contact.

[0045] By reasonably reducing the inner diameter of the cylinder 6 and increasing the outer diameter of the limiting assembly, the friction between the friction elastic member 1 and the inner wall of the cylinder 6 and the friction between the friction elastic member 1 and the limiting assembly can be adjusted, thereby achieving adjustable damping.

[0046] The present embodiment provides a method for assembling a self-resetting friction damper:

[0047] according to Figure 1-Figure 8 The cylinder 6 is made in the shape shown in the figure. The central shaft 5, the friction spring, the limit assembly and the second ear plate 7 are all coated with rust-proof high friction coefficient liquid or semi-solid paste material. The second limit piece 3 is placed, and the number of friction springs is determined according to the damper stiffness required by the design. The outer ring and the inner ring of the friction spring are placed alternately, and the first limit piece 4 is placed on it. The central shaft 5 is placed, and the central shaft 5 passes through the first through hole of the first limit piece 4, the second through hole of the second limit piece 3 and the cylinder 6 in sequence, and then extends out of the cylinder 6. The first ear plate 8 is screwed on one end of the first limit piece 4 of the cylinder 6, and the second ear plate 7 of the damper is screwed on one end of the second limit piece 3 of the central shaft 5. At this time, the first ear plate 8 and the cylinder 6, and the second ear plate 7 and the central shaft 5 are not completely tightened. Here, they only serve to connect the whole and achieve reliable contact connection. When all the assembly parts are assembled, use a wrench to reversely screw the first ear plate 8 and the second ear plate 7 to achieve the purpose of applying preload, as shown in FIG. Fig. 9 shown.

Claims

1. A self-resetting friction damper, comprising a cylinder (6), one end of the cylinder (6) being fixed with a first ear plate (8), and the other end of the cylinder (6) being slidably connected with a second ear plate (7), characterized in that: It also includes a friction elastic member (1) and a limit assembly disposed in the cylinder (6), the friction elastic member (1) being located between the inner wall of the cylinder (6) and the limit assembly and being in close contact with the inner wall of the cylinder (6) and the limit assembly, the limit assembly comprising a first limit member (4) and a second limit member (3), the first limit member (4) being against the first ear plate (8) by the elastic force of the friction elastic member (1), the second limit member (3) moving with the second ear plate (7) and exerting force on the friction elastic member (1); the first limit member (4) being a U-shaped limit member, the second limit member (3) being a U-shaped limit member, The open end of the U-shaped cross-section stopper is folded outward to form a folding area (2); the folding area (2) of the first stopper (4) abuts against the first ear plate (8) through one end of the friction elastic member (1); the other end of the friction elastic member (1) abuts against the folding area (2) of the second stopper (3); the first stopper (4) is provided with a first through hole, the second stopper (3) is provided with a second through hole, the second ear plate (7) is fixed to the central axis (5), the central axis (5) passes through the cylinder (6), the second through hole and the first through hole in sequence, and the cross-sectional area of ​​the end (9) of the central axis is larger than that of the first through hole; Both ends of the cylinder (6) are regular hexagonal ends, and the cross-section of the end (9) of the central shaft is a regular hexagon; the self-resetting preload force of the damper is applied by applying an external torsional force between the cylinder (6) and the first ear plate (8), and between the central shaft (5) and the second ear plate (7), until the second ear plate (7) and the central shaft (5) are twisted to a preset thread position, and at the same time, the first ear plate (8) and the cylinder (6) reach a preset thread position; The second ear plate (7) is connected to the central shaft (5) via a threaded connection, and the first ear plate (8) is connected to the open end of the cylinder (6) via a threaded connection; The cavity between the first limiting member (4) and the second limiting member (3) is the tensile stroke of the damper, and the distance between the second ear plate (7) and the cylinder (6) is the compressive stroke.

2. A self-resetting friction damper according to claim 1, characterized in that: The friction elastic member (1) is a 60Si2Mn alloy friction elastic member, and the central axis (5) is a 38CrMoAl alloy central axis.

3. A self-resetting friction damper according to claim 1, characterized in that: The friction elastic member (1) comprises two layers, namely an inner ring and an outer ring.

4. A self-resetting friction damper according to claim 1, characterized in that: The surfaces of the friction elastic member (1), the limiting assembly and the second ear plate (7) are coated with an anti-rust layer.

5. A self-resetting friction damper according to claim 1, characterized in that: The cylinder (6) is a Q345 steel cylinder, the first ear plate (8) is a Q345 steel first ear plate, the second ear plate (7) is a Q345 steel second ear plate, and the limit assembly is a Q345 steel limit assembly.

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