A two-stage friction damper

Abstract

The application discloses a double-stage friction damper and relates to the technical field of friction dampers. The double-stage friction damper comprises a constraint plate, main sliding plates are arranged on the two sides of the constraint plate, and main friction plates are fixed to the inner walls of the main sliding plates; a fastener is arranged and used for fastening and mounting the constraint plate and the main sliding plates; a sub-stage displacement track is sleeved to the left side of the constraint plate, sub sliding plates are arranged on the front and back sides of the sub-stage displacement track, the sub sliding plates are fixed to the inner wall cavities of the main sliding plates, and sub friction plates are fixed to the two sides of the sub sliding plates; and an inertia resistance component is arranged in the main sliding plate and used for resisting the sub friction plates. The double-stage friction damper is provided with double-stage friction, which is helpful to improve the anti-seismic damping effect and is suitable for different degrees of vibration.

Description

Technical Field

[0001] This invention relates to the field of friction damper technology, specifically a two-stage friction damper. Background Technology

[0002] The main working principle of current two-stage friction dampers on the market is to trigger a second-stage displacement through the displacement limiting hole of the sliding plate to generate a second-stage damping force. However, in reciprocating motion, this method only triggers the damping force in one direction. When returning to the single-stage working mode, the damping force immediately decreases. It does not actually reduce the damping force in stages according to the two-stage displacement. Similarly, there are also corresponding problems with friction dampers with different damping forces connected in series to achieve two-stage displacement. In fact, the above-mentioned solutions on the market do not truly achieve the output of graded damping force based on staged displacement. Summary of the Invention

[0003] The purpose of this invention is to provide a two-stage friction damper to solve the problems mentioned in the background. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a two-stage friction damper, comprising a constraint plate, wherein main sliding plates are installed on both sides of the constraint plate, and main friction plates are fixed on the inner wall of the main sliding plates; It also includes fasteners for securing the constraint plate and the main sliding plate. A stepped displacement track is fitted on the left side of the constraint plate. A secondary sliding plate is provided on both the front and rear sides of the stepped displacement track. The secondary sliding plate is fixed in the cavity of the inner wall of the main sliding plate. A secondary friction plate is fixed on both sides of the secondary sliding plate. An inertial contact assembly is disposed within the main sliding plate and is used to contact the secondary friction plate.

[0005] Preferably, the main friction plate is made of rubber material, and the main friction plate abuts against the front and rear sides of the constraint plate.

[0006] Preferably, the fastener includes a clamping bolt and a clamping disc spring. The clamping bolt is installed between the two main sliding plates and the constraint plate, and a clamping disc spring is provided between the clamping bolt and the main sliding plate.

[0007] Preferably, the clamping bolts are evenly distributed on the main sliding plate, and there is a space for the clamping bolts to move within the main sliding plate and the constraint plate.

[0008] Preferably, the stepped displacement track has a raised structure in the middle, and the raised part in the middle of the stepped displacement track abuts against the auxiliary sliding plate.

[0009] Preferably, the secondary friction plates are symmetrically distributed on both sides of the secondary sliding plate, and the secondary friction plates do not contact the central protrusion of the stepped displacement track in the initial state.

[0010] Preferably, the inertial contact assembly includes an inertial bar, which is slidably installed within the main sliding plate by means of a spring. An abutment bar is provided at the outer end of the inertial bar, and the abutment bar passes through the main sliding plate and is fixed to the secondary friction plate.

[0011] Preferably, the inertia bars are symmetrically arranged about the secondary sliding plate, and the outer ends of the inertia bars and the outer ends of the contact bars are designed as inclined structures.

[0012] Compared with the prior art, the beneficial effects of the present invention are: In this invention, under the first-order displacement condition, the motion contact state between the secondary sliding plate and the stepped displacement track always keeps the secondary friction plate isolated from the constraint plate, that is, there is no friction with the constraint plate and no additional damping force is generated. At the same time, the main friction plate always rubs against the constraint plate throughout the entire working displacement state, that is, there is always frictional damping force generated. When the product displacement reaches the second working condition, the motion contact state between the secondary sliding plate and the stepped displacement track is transformed into the second stage, so that the secondary friction plate comes into contact with the constraint plate. At the same time, under the preload of the clamping disc spring, the secondary friction plate begins to generate frictional damping force, that is, the additional frictional damping force under the second-order displacement. During the second-order displacement stroke of the auxiliary sliding plate, when it begins to move back to the midpoint position, due to the bidirectional stepped design of the stepped displacement track, the auxiliary friction plate continues to generate damping force through contact friction with the constraint plate until the auxiliary sliding plate enters the first-order displacement design stroke of the stepped displacement track. Only then does the auxiliary friction plate separate from the constraint plate, the additional friction damping force becomes zero, and the working condition returns to the first-order state. An inertial damping component is set up to generate different inertial forces according to the magnitude of the vibration. When the main sliding plate moves, the inertial force keeps the inertial bar temporarily in place. The inertial bar pushes the damping bar to move, which in turn abuts the secondary friction plate, increasing the friction between the secondary friction plate and the stepped displacement track in the second stage, thereby increasing the damping force. The damping friction force of the secondary friction plate is adjusted in real time according to the vibration amplitude and inertial force to improve the friction effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view cross-sectional structural diagram of the present invention; Figure 3 This is a top view schematic diagram of the stepped displacement track structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B.

[0014] In the diagram: 1. Constraint plate; 2. Main sliding plate; 3. Main friction plate; 4. Clamping bolt; 5. Clamping disc spring; 6. Stepped displacement track; 7. Secondary sliding plate; 8. Secondary friction plate; 9. Inertial contact assembly; 91. Inertial bar; 92. Spring; 93. Contact bar. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Please see Figures 1-5 The present invention provides a technical solution: a two-stage friction damper, including a constraint plate 1, with main sliding plates 2 installed on both sides of the constraint plate 1, and a main friction plate 3 fixed on the inner wall of the main sliding plate 2; the main friction plate 3 is made of rubber material, and the main friction plate 3 abuts against the front and rear sides of the constraint plate 1; When vibration occurs, the main sliding plate 2 moves according to the direction of vibration, generating long-term frictional damping between the main friction plate 3 and the constraint plate 1.

[0017] As a specific embodiment of the present invention, fasteners are used to fasten the constraint plate 1 and the main sliding plate 2; a stepped displacement track 6 is sleeved on the left side of the constraint plate 1, and auxiliary sliding plates 7 are provided on the front and rear sides of the stepped displacement track 6. The auxiliary sliding plates 7 are fixed in the cavity of the inner wall of the main sliding plate 2, and auxiliary friction plates 8 are fixed on both sides of the auxiliary sliding plates 7. Fasteners include clamping bolts 4 and clamping disc springs 5. The clamping bolts 4 are installed between the two main sliding plates 2 and the constraint plate 1. The clamping disc springs 5 ​​are provided between the clamping bolts 4 and the main sliding plates 2. The clamping bolts 4 are evenly distributed on the main sliding plates 2, and there is a space for the clamping bolts 4 to move within the main sliding plates 2 and the constraint plate 1. A protruding structure is provided in the middle of the stepped displacement track 6, and the protrusion in the middle of the stepped displacement track 6 abuts against the secondary sliding plate 7. The secondary friction plates 8 are symmetrically distributed on both sides of the secondary sliding plate 7. In the initial state, the secondary friction plates 8 do not contact the protrusion in the middle of the stepped displacement track 6. By contacting the raised position of the secondary sliding plate 7 with the stepped displacement track 6, further frictional damping is provided, achieving the first stage of operation. Then, the secondary sliding plate 7 drives the secondary friction plate 8 to move, so that the secondary friction plate 8 moves to the raised position of the stepped displacement track 6. The motion contact state between the secondary sliding plate 7 and the stepped displacement track 6 is transformed into the second stage, so that the secondary friction plate 8 contacts the stepped displacement track 6. At the same time, under the preload of the pressing disc spring 5, the secondary friction plate 8 begins to generate frictional damping force, that is, the additional frictional damping force under the second displacement. Then, the main sliding plate 2 resets, so that the secondary friction plate 8 follows the secondary sliding plate 7 to reset. The secondary friction plate 8 separates from the stepped displacement track 6 and returns to the initial state.

[0018] An inertial contact assembly 9 is disposed within the main sliding plate 2 and is used to contact the secondary friction plate 8. The inertial contact assembly 9 includes an inertial bar 91, which is slidably installed within the main sliding plate 2 via a spring 92. An abutment bar 93 is provided at the outer end of the inertial bar 91, and the abutment bar 93 passes through the main sliding plate 2 and is fixed to the secondary friction plate 8. The inertial bar 91 is symmetrically arranged about the secondary sliding plate 7, and the outer ends of the inertial bar 91 and the outer ends of the abutment bar 93 are designed as inclined structures. Depending on the amplitude, the generated inertial force is different. When the main sliding plate 2 moves, the inertial bar 91 contacts the inclined surface of the contact bar 93 under inertia, pushing the contact bar 93 to move towards the secondary friction plate 8, and pushing the secondary friction plate 8 to contact the protrusion of the stepped displacement track 6 more tightly.

[0019] Working principle: When vibration occurs, the main sliding plate 2 moves according to the vibration direction, generating long-term frictional damping between the main friction plate 3 and the constraint plate 1. At the same time, the auxiliary sliding plate 7 contacts the protruding position of the stepped displacement track 6, further providing frictional damping and realizing the first stage of working state. Then, the auxiliary sliding plate 7 drives the auxiliary friction plate 8 to move, so that the auxiliary friction plate 8 moves to the protruding position of the stepped displacement track 6. The motion contact state between the auxiliary sliding plate 7 and the stepped displacement track 6 is transformed into the second stage, so that the auxiliary friction plate 8 contacts the stepped displacement track 6. At the same time, under the preload of the pressing disc spring 5, the auxiliary friction plate 8 begins to generate frictional damping force, that is, the additional frictional damping force under the second displacement. Then, the main sliding plate 2 resets, so that the auxiliary friction plate 8 follows the auxiliary sliding plate 7 to reset. The auxiliary friction plate 8 separates from the stepped displacement track 6 and returns to the initial state. Depending on the amplitude, different inertial forces are generated. When the main sliding plate 2 moves, the inertial strip 91 contacts the inclined surface of the contact strip 93 under inertia, pushing the contact strip 93 towards the secondary friction plate 8. This pushes the secondary friction plate 8 to contact the protrusion of the stepped displacement track 6 more tightly, increasing the frictional resistance. That is, the greater the inertial force, the greater the distance that the contact strip 93 pushes the secondary friction plate 8, and the higher the frictional resistance it provides. The force is output in stages according to the displacement stroke, achieving precise output of frictional damping force.

[0020] Contents not described in detail in this specification are prior art known to those skilled in the art. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate orientations or positional relationships based on the accompanying drawings, and are used only for ease of description and simplification, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-stage friction damper, comprising a constraint plate (1), wherein main sliding plates (2) are installed on both sides of the constraint plate (1), and a main friction plate (3) is fixed on the inner wall of the main sliding plate (2); Its features are: It also includes fasteners for securing the constraint plate (1) and the main sliding plate (2); A stepped displacement track (6) is fitted on the left side of the constraint plate (1). A secondary sliding plate (7) is provided on the front and rear sides of the stepped displacement track (6). The secondary sliding plate (7) is fixed in the cavity of the inner wall of the main sliding plate (2). A secondary friction plate (8) is fixed on both sides of the secondary sliding plate (7). An inertial contact assembly (9) is disposed within the main sliding plate (2) and is used to contact the secondary friction plate (8). The stepped displacement track (6) is provided with a protruding structure in the middle, and the protrusion in the middle of the stepped displacement track (6) abuts against the secondary sliding plate (7); The secondary friction plates (8) are symmetrically distributed on both sides of the secondary sliding plate (7). In the initial state, the secondary friction plates (8) do not contact the central protrusion of the stepped displacement track (6). The inertial contact assembly (9) includes an inertial bar (91), which is slidably installed in the main sliding plate (2) by a spring (92). The outer end of the inertial bar (91) is provided with a contact bar (93), which passes through the main sliding plate (2) and is fixed to the secondary friction plate (8). The inertia bar (91) is symmetrically arranged about the auxiliary sliding plate (7), and the outer ends of the inertia bar (91) and the outer ends of the contact bar (93) are designed as inclined structures.

2. The two-stage friction damper according to claim 1, characterized in that: The main friction plate (3) is made of rubber material, and the main friction plate (3) abuts against the front and rear sides of the constraint plate (1).

3. A two-stage friction damper according to claim 2, characterized in that: The fasteners include a clamping bolt (4) and a clamping disc spring (5). The clamping bolt (4) is installed between the two main sliding plates (2) and the constraint plate (1). The clamping disc spring (5) is provided between the clamping bolt (4) and the main sliding plate (2).

4. A two-stage friction damper according to claim 3, characterized in that: The clamping bolts (4) are evenly distributed on the main sliding plate (2), and there is a space for the clamping bolts (4) to move within the main sliding plate (2) and the constraint plate (1).

Images