A self-centering variable stiffness viscous damper

Abstract

The application discloses a self-resetting variable stiffness viscous damper and relates to the technical field of bridge anti-seismic dampers, wherein the variable stiffness viscous damper comprises a cylinder body, a piston assembly and a supporting assembly, the cylinder body is provided with through holes at two ends, respectively, and the inside of the cylinder body is filled with damping medium; the piston assembly is slidably sleeved in the inside of the cylinder body; the two ends of the piston assembly extend out of the cylinder body through the through holes, respectively; a reset spring is fixed between one end of the piston assembly and the outer wall of the cylinder body; a plurality of hinged seats are fixed on the outer side wall of the cylinder body; the number of supporting rods corresponds to the number of the hinged seats; one end of each supporting rod is rotatably connected with a hinged seat; the other end of each supporting rod is fixedly connected with one end of the piston assembly extending out of the cylinder body; and the initial stiffness of the damper is provided through the supporting rods. In the application, the connection and disconnection between the supporting rods and the piston assembly can realize the variable stiffness of the damper, and the damper can be repaired after being broken, so that the damper can be repeatedly used.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge seismic dampers, in particular to a self-resetting variable stiffness viscous damper. BACKGROUND

[0002] Earthquakes and strong winds are extremely destructive natural disasters, which are extremely destructive to large bridges and high-rise buildings, causing serious safety hazards and economic losses. Therefore, how to minimize the threat of earthquakes and wind disasters to human safety and the destruction of the economy has become a very serious problem.

[0003] In recent years, by arranging energy dissipation devices on the structure, using the relative displacement and relative velocity generated by the structure during vibration, the energy dissipation device consumes the vibration energy of the structure, reduces the vibration response of the structure, and thus achieves the purpose of shock absorption and energy dissipation. Common shock absorption and energy dissipation devices are divided into velocity type and displacement type, metal dampers and friction dampers belong to displacement type dampers, their energy consumption and damping force provided are related to the relative displacement during structure vibration, the greater the relative displacement, the better the energy dissipation effect; viscoelastic dampers and viscous dampers belong to velocity type dampers, the greater the relative velocity during structure vibration, the greater the damping force provided by the two dampers.

[0004] But different levels of earthquakes have different requirements for energy dissipation and shock absorption devices. In the face of small earthquakes or wind loads, energy dissipation and shock absorption devices are needed to provide an initial stiffness to the structure to resist earthquake loads and wind loads; under medium and high intensity earthquakes, a larger damping is needed to provide to the structure to consume the energy brought by the earthquake and reduce the damage of the earthquake to the structure. But the viscous damper itself has no stiffness, and it is difficult to realize variable stiffness. At the same time, the viscous damper does not have a self-resetting function, and the structure will produce a large residual displacement, affecting post-earthquake traffic.

[0005] Therefore, how to provide a self-resetting variable stiffness viscous damper that can provide initial stiffness and subsequent damping, has a self-resetting function, and can be repeatedly used is a problem that those skilled in the art need to solve. SUMMARY

[0006] Therefore, the present application provides a self-resetting variable stiffness viscous damper, which aims to solve the above technical problems.

[0007] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0008] The present application provides a self-resetting variable stiffness viscous damper, comprising: a cylinder body, a piston assembly and a support assembly.

[0009] Both ends of the cylinder are provided with through holes, and the cylinder is filled with damping medium; the piston assembly is coaxially sleeved in the cylinder and is in sliding connection with the cylinder;

[0010] One end of the piston assembly extends out of the cylinder through the through hole, and a return spring is fixed between the other end of the piston assembly and the outer wall of the cylinder;

[0011] The support assembly comprises a plurality of hinged seats fixed on the outer side wall of the cylinder and a plurality of support rods corresponding to the hinged seats, one end of each support rod being in rotational connection with a hinged seat and the other end of each support rod being fixedly connected with one end of the piston assembly extending out of the cylinder.

[0012] Compared with the prior art, the self-resetting variable stiffness viscous damper provided by the technical solution has the cylinder filled with damping medium, the piston assembly is in sliding connection with the cylinder, and the piston assembly and the outer wall of the cylinder are connected by a return spring; in addition, the hinged seats are fixed on the outer side wall of the cylinder, the support rods are hinged to the hinged seats, and the other ends of the support rods are fixed to the piston assembly; when the viscous damper faces small earthquakes and wind loads, the support rods and the piston assembly are relatively fixed, thus providing initial stiffness for the device; when the viscous damper faces large earthquakes and wind loads, the fixed connection between the support rods and the piston assembly is broken, the viscous damper starts to work, thus providing damping for the structure and dissipating energy.

[0013] Preferably, the other end of the support rod away from the hinged seat is welded to the end of the piston assembly extending out of the cylinder, so that the damper provides initial stiffness by fixing the support rods and the piston assembly when facing small earthquakes and wind loads.

[0014] Preferably, one end of the cylinder is connected with a chamber, a plurality of disc springs are sequentially stacked on the bottom surface in the chamber, the top end of each disc spring is fixedly connected with a sliding plate, the sliding plate is located below the bottom end of the piston assembly, and the sliding plate is in sliding connection with the inner side wall of the chamber; when the energy dissipation of the damper reaches a limit, the piston assembly compresses the sliding plate, the sliding plate slides downward to compress the plurality of stacked disc springs, thus achieving variable stiffness; after the earthquake ends, the disc springs reset, increase the restoring force of the damper, help the piston return to the initial position, and reduce residual displacement.

[0015] Preferably, the inner side wall of the chamber is fixed with a plurality of stop blocks above the sliding plate and abutting against the top surface of the sliding plate; the movement range of the sliding plate is limited by the plurality of stop blocks fixed on the inner side wall of the chamber, so that the stiffness of the damper can be adjusted.

[0016] Preferably, the piston assembly comprises a piston head and a piston rod, the piston head is sleeved in the cylinder body, a gap is left between the piston head and the inner side wall of the cylinder body, and the piston rod penetrates through the piston head and is fixedly connected with the piston head; the larger the gap between the piston head and the inner side wall of the cylinder body is, the smaller the damping force is, and vice versa, so the gap is set to be infinitesimal, but the damping liquid needs to circulate in the cylinder body, so that the damper achieves the purpose of energy consumption.

[0017] Preferably, one end of the piston rod is fixedly connected with a head connecting ring, and the other end of the piston rod is a T-shaped structure, and the T-shaped structure is located in the chamber; the piston rod is arranged in a T-shaped structure, which can avoid retracting into the cylinder body during the resetting process of the damper, and can increase the contact area with the sliding plate during the working of the damper, so that the force is correspondingly applied to the disc spring, avoiding the stress generated by the earthquake from being skewed and then causing impact damage to other devices.

[0018] Preferably, the chamber is fixedly connected with a tail connecting ring away from the cylinder body.

[0019] According to the above technical solution, compared with the prior art, the self-resetting variable stiffness viscous damper has the following beneficial effects:

[0020] 1、The damper is provided with a support assembly, one end of the support rod is hinged to the cylinder body, the other end is fixedly connected with the piston assembly, and the device provides initial stiffness to resist small earthquakes and wind loads; when facing large earthquakes and wind loads, the fixed end of the support assembly breaks, and the damper starts to provide damping and further energy consumption.

[0021] 2、The damper is provided with a disc spring, which is compressed by the piston rod after the support assembly breaks, and then the disc spring is compressed to provide stiffness for the damper, so that the stiffness can be changed, and the restoring force of the damper can also be increased when the disc spring returns after the earthquake. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute a part of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on the provided drawings.

[0023] Fig. 1 The drawing is a structural schematic diagram of the damper in an initial state provided by the present application.

[0024] Fig. 2 The drawing is a schematic diagram of the support arm in a broken state provided by the present application.

[0025] Fig. 3 The drawing is a structural schematic diagram of the disc spring in a compressed state provided by the present application.

[0026] Wherein:

[0027] 1-cylinder, 2-piston assembly, 3-return spring, 4-support assembly, 5-hinge seat, 6-support rod, 7-chamber, 8-disc spring, 9-slide plate, 10-stop block, 11-piston head, 12-piston rod, 13-head connection, 14-tail connection. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Referring to the drawings, Figs. 1-3 The embodiment of the present application discloses a self-resetting variable stiffness viscous damper, comprising: a cylinder 1, a piston assembly 2 and a support assembly 4.

[0030] The cylinder 1 is provided with through holes at both ends, and the inside of the cylinder 1 is filled with damping medium; the piston assembly 2 is coaxially sleeved in the inside of the cylinder 1 and is in sliding connection with the cylinder 1; both ends of the piston assembly 2 extend out of the cylinder 1 through the through holes, and a return spring 3 is fixed between one end of the piston assembly 2 and the outer wall of the cylinder 1; the support assembly 4 comprises: a hinge seat 5 and a support rod 6, the number of the hinge seats 5 is multiple, the multiple hinge seats 5 are fixed on the outer side wall of the cylinder 1, the number of the support rods 6 corresponds to that of the hinge seats 5, one end of the support rod 6 is in rotary connection with the hinge seat 5, and the other end of the support rod 6 is in fixed connection with one end of the piston assembly 2 extending out of the cylinder 1.

[0031] In order to further optimize the above technical scheme, the end of the support rod 6 away from the hinge seat 5 is welded with the end of the piston assembly 2 extending out of the cylinder body 1, so that the damper provides initial stiffness by fixing the support rod 4 and the piston assembly 2 when facing small earthquakes and wind loads.

[0032] In order to further optimize the above technical scheme, one end of the cylinder body 1 is extended and connected with a chamber 7, a plurality of disc springs 8 are sequentially stacked on the bottom surface inside the chamber 7, the top end of the disc spring 8 is fixedly connected with a sliding plate 9, the sliding plate 9 is located below the bottom end of the piston assembly 2, and the sliding plate 9 is slidingly connected with the inner side wall of the chamber 7; when the energy consumption of the damper reaches the maximum limit, the piston assembly 2 compresses the sliding plate 9, the sliding plate 9 slides downward to compress the plurality of stacked disc springs 8 to realize variable stiffness, and after the earthquake ends, the disc springs 8 reset, increase the restoring force of the damper, help the piston assembly 2 return to the initial position, and reduce residual displacement.

[0033] In order to further optimize the above technical scheme, a plurality of stop blocks 10 are fixed on the inner side wall of the chamber 7, the stop blocks 10 are located above the sliding plate 9 and abut against the top surface of the sliding plate 9; by fixing a plurality of stop blocks 10 on the inner side wall of the chamber 7, the movement range of the sliding plate 9 is limited, and the adjustable variable stiffness of the damper is realized.

[0034] In order to further optimize the above technical scheme, the piston assembly 2 comprises a piston head 11 and a piston rod 12, the piston head 11 is slidingly sleeved inside the cylinder body 1, a gap is left between the piston head 11 and the inner side wall of the cylinder body 1, and the piston rod 12 penetrates through the piston head 11 and is fixedly connected with the piston head 11; by setting a gap between the piston head 11 and the inner side wall of the cylinder body 1, the larger the gap, the smaller the damping force, and vice versa, so the gap is set to be infinitesimal, but the damping liquid needs to circulate inside the cylinder body, so that the damper achieves the purpose of energy consumption.

[0035] In order to further optimize the above technical scheme, one end of the piston rod 12 is fixedly connected with a head connecting ring 13, the other end of the piston rod 12 is a “T” type structure, and the “T” type structure is located inside the chamber 7; by setting the piston rod 12 as a “T” type structure, the damper can be prevented from retracting into the cylinder body during the resetting process, and the contact area between the damper and the sliding plate 9 can be increased during operation, so that the stress generated by the earthquake is avoided from being skewed and then causing impact damage to other devices.

[0036] In order to further optimize the above technical scheme, the tail connecting ring 14 is fixedly connected to one end of the chamber 7 away from the cylinder body 1; the head connecting ring 13 and the tail connecting ring 14 are connected to the pier and the bridge respectively, and the relative displacement between the pier and the bridge is generated when the earthquake occurs, so that the relative displacement between the head connecting ring 13 and the tail connecting ring 14 is generated, so that the relative displacement of the damper caused by the earthquake is more accurate; when resetting after the earthquake, the reset spring 3 can be used to assist the reset, so that the piston rod 12 and the piston head 11 can be smoothly reset.

[0037] The working process of the embodiment is as follows:

[0038] Firstly, the inside of the cylinder body 1 is filled with damping medium, and then the piston assembly 2 is slidably connected in the inside of the cylinder body 1, at this time, the two ends of the piston assembly 2 extend out of the cylinder body, and the piston assembly 2 and the outer wall of the cylinder body 1 are connected by the reset spring 3; the reset spring 3 is compressed or stretched accordingly with the movement of the piston rod 12, and the reset spring 3 can provide a restoring force to make the piston assembly 2 return to the pre-earthquake position, thereby reducing the residual displacement between the pier and the bridge. Since the volume of the part of the piston rod 12 entering the cylinder body 1 is constant, the pressure of the liquid in the cylinder body 1 will not be affected, and the phenomenon of vacuum in the cylinder body 1 will not occur, and the piston rod 12 will not be pushed and cannot move freely due to excessive pressure in the cylinder body 1. In addition, the hinge seat 5 is fixed on the outer side wall of the cylinder body 1, the support rod 6 is hingedly connected to the hinge seat 5, and the other end of the support rod 6 is fixed with the piston assembly 2. When the viscous damper faces a small earthquake and wind load, the support rod 6 and the piston assembly 2 are relatively fixed, providing initial stiffness for the device. When the viscous damper faces a large earthquake and wind load, the fixed connection between the support rod 6 and the piston assembly 2 is broken, and the viscous damper starts to work, providing damping to the structure and dissipating energy. At the same time, the chamber 7 extends from the bottom of the cylinder body 1, and the disc spring 8 is stacked in the chamber 7. When the earthquake is large, after the connection between the piston rod 12 and the support rod 6 is broken, the "T" structure at the lower end of the piston rod 12 is pressed down, pushing the sliding plate 9 to compress the disc spring 8, thereby providing stiffness for the damper and realizing variable stiffness. At the same time, when the disc spring 8 returns after the earthquake, the restoring force of the damper can also be increased. During the post-earthquake reconstruction process, the support rod 6 and the piston rod 12 in the damper only need to be re-welded, and the damper can be reused, saving production costs.

[0039] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0040] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the appended claims are intended to cover all such modifications that do not depart from the true spirit and scope of the application. Therefore, the application is not limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-resetting variable stiffness viscous damper, characterized in that, include: The cylinder (1) has through holes at both ends and is filled with a damping medium. Piston assembly (2), the piston assembly (2) is coaxially sleeved inside the cylinder body (1) and slidably connected to the cylinder body (1); both ends of the piston assembly (2) extend out of the cylinder body (1) through the through hole respectively, and a return spring (3) is fixed between one end of the piston assembly (2) and the outer wall of the cylinder body (1). The cylinder (1) extends a chamber (7) at the end away from the return spring (3). Multiple disc springs (8) are stacked sequentially on the bottom surface of the chamber (7) away from the cylinder (1). A sliding plate (9) is fixedly connected to the top of the disc springs (8). The sliding plate (9) is located below the bottom end of the piston assembly (2). The sliding plate (9) is slidably connected to the inner wall of the chamber (7). Multiple stops (10) are fixed on the inner wall of the chamber (7). The stops (10) are located above the sliding plate (9) and abut against the top surface of the sliding plate (9). The support assembly (4) includes: a hinge seat (5) and a support rod (6). There are multiple hinge seats (5), which are fixed on the outer side wall of the cylinder (1). The number of support rods (6) corresponds to the number of hinge seats (5). One end of the support rod (6) is rotatably connected to the hinge seat (5), and the other end of the support rod (6) is fixedly connected to one end of the piston assembly (2) extending out of the cylinder (1). The end of the support rod (6) away from the hinge seat (5) is welded to the end of the piston assembly (2) extending out of the cylinder (1). The piston assembly (2) includes a piston head (11) and a piston rod (12). The piston head (11) is slidably sleeved inside the cylinder (1). A gap is left between the piston head (11) and the inner side wall of the cylinder (1). The piston rod (12) passes through the piston head (11) and is fixedly connected to the piston head (11). When the viscous damper is subjected to small earthquake and wind loads, the support rod (60) and piston assembly (2) are relatively fixed in position, providing initial stiffness for the device; when the viscous damper is subjected to large earthquake and wind loads, the fixed connection between the support rod (60) and piston assembly (2) breaks, the viscous damper starts to operate, provides damping for the structure, and dissipates energy; during the post-earthquake reconstruction process, the damper can be reused simply by re-welding the support rod (6) and piston rod (12) in the damper.

2. The self-resetting variable stiffness viscous damper according to claim 1, characterized in that, One end of the piston rod (12) is fixedly connected to a head connecting ring (13), and the other end of the piston rod (12) is a "T" shaped structure, which is located in the chamber (7).

3. The self-resetting variable stiffness viscous damper according to claim 1, characterized in that, A tail connecting ring (14) is fixedly connected to the outer side of the end of the chamber (7) away from the cylinder (1).

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