Self-resetting inerter friction damper for vibration reduction of inhaul cable

Abstract

The invention discloses a self-resetting inerter friction damper for vibration reduction of an inhaul cable. The self-resetting inerter friction damper comprises a supporting mechanism and a friction resistance increasing mechanism. The supporting mechanism is directly and vertically connected with the inhaul cable, and the friction resistance increasing mechanism is arranged in the supporting mechanism, so that the situation that the stability of the friction damper is reduced possibly due to the fact that the friction resistance increasing mechanism makes contact with the inhaul cable is avoided; the resistance increasing mode that a traditional friction damper and a vibration reduction object move oppositely is converted into the rotating friction resistance increasing mode perpendicular to the amplitude direction of the two inhaul cables, the rotating friction torque is amplified, and the overall size of the friction damper is remarkably reduced when the vibration reduction effect is achieved; therefore, the overall size of the friction damper is effectively reduced, the difficulty that the friction damper is installed between the inhaul cables is reduced, and the practicability and the application scene of the friction damper are further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cable vibration reduction, and more specifically, relates to a self-resetting inertia friction damper for cable vibration reduction. Background Art

[0002] The cables of cable-stayed bridges are crucial force-transmitting elements in their structures, and they play a decisive role in the safety and stability of bridges during their service. Due to their light weight, low stiffness and low damping, cables are prone to vibration under the influence of wind and vehicle loads. This vibration may cause significant bending stress in the anchoring area of ​​the cables, and long-term accumulation may cause fatigue, eventually leading to the breakage of the cable wires, posing a serious threat to the safety of the bridge. Therefore, it is particularly urgent to conduct in-depth research on the mechanism of wind-induced vibration of cables and its control methods. Among the many control strategies, they can be mainly divided into three categories according to their working principles: adjusting the aerodynamic characteristics of the cables, changing the structural design of the cables, and introducing damping devices.

[0003] Damping devices are popular because of their high cost-effectiveness, easy installation and maintenance, and ability to effectively improve the damping ratio of cables. Friction dampers are one of them. According to their working principles, friction dampers can be divided into two types: translational and rotational. Translational friction dampers are mainly composed of constrained steel plates and friction materials. When relative sliding occurs between the steel plates and the friction materials, kinetic energy can be effectively converted into heat energy, thereby consuming vibration energy. Rotational friction dampers are mainly composed of rotating steel plates and friction rings. When the rotating steel plates and the friction rings rotate relative to each other, the vibration energy is dissipated through the friction between the steel plates and the friction rings. These traditional friction dampers have been widely used in engineering practice due to their simple structure, clear working principle, and stable energy dissipation effect. In the prior art, a Chinese patent with document number CN118601404A discloses a cable vibration reduction system installed at the end of a tower, which includes a damper, a support rod and a connecting rod; the top end of the connecting rod is connected to the middle part of the cable, and the other end is movably connected to the top end of the damper, and the bottom end of the damper is fixed to the tower through a support; the middle part of the connecting rod is connected to the bottom end of the support rod, and the top end of the support rod is fixed to the tower; the position where the support rod is connected to the tower is higher than the position where the damper is connected to the tower; when the cable vibrates in the vertical direction perpendicular to the cable string, the connecting rod allows the damper to deform along the axis of the connecting rod to dissipate energy and reduce consumption; when the cable vibrates in the horizontal direction perpendicular to the cable string, the connecting rod allows the damper to rotate around the position where it is connected to the support rod, pushing the damper to dissipate energy and reduce vibration.

[0004] Although the cable vibration reduction system of the above-mentioned patent can solve the problem that the lower end of the cable is not suitable for installing a damper for vibration reduction, and work in conjunction with the damper installed at the lower end of the cable to improve the vibration reduction effect, it still does not solve some problems existing in the existing cable friction damper: (1) The translational friction damper increases the friction force by increasing the friction area, which often increases the size of the damper, limits the application scenarios, and is not suitable for cable vibration reduction; (2) Although the rotational friction damper is small in size and easy to install, its friction force is often small and the energy consumption effect is limited; (3) The traditional friction damper provides friction force through the relative movement of the steel plate and the friction material, and the relative movement direction is the same as the vibration direction of the vibration reduction object, so that in the process of achieving vibration reduction, in order to meet the vibration reduction effect, the overall length of the damper is significantly increased, thereby limiting its application in cable vibration reduction. Summary of the invention

[0005] In response to the above defects or improvement needs of the prior art, the present invention provides a self-resetting inertial friction damper for cable vibration reduction, which directly and vertically connects the cable through the support mechanism and places the friction resistance increasing mechanism inside the support mechanism to avoid the friction resistance increasing mechanism contacting the cable, which may cause the stability of the friction damper to be reduced. At the same time, by converting the resistance increasing mode of the traditional friction damper and the vibration reduction object moving towards each other into a rotational friction resistance increasing mode perpendicular to the amplitude direction of the two cables, and amplifying the rotational friction torque, the overall volume of the friction damper is significantly reduced when the vibration reduction effect is achieved, thereby effectively reducing the overall volume of the friction damper, reducing the difficulty of installing the friction damper between the cables, and further improving the practicability and application scenarios of the friction damper.

[0006] In order to achieve the above-mentioned object, the present invention provides a self-resetting inertia friction damper for cable vibration reduction, comprising: a support mechanism and a friction resistance increasing mechanism, wherein:

[0007] The support mechanism comprises: a first connecting member, a second connecting member, a first supporting member and a second supporting member; the first connecting member is arranged at one end of the first supporting member and is detachably connected to a cable in a vertical manner; a polygonal cavity is arranged inside the first supporting member, and a sleeve is arranged at the other end of the first supporting member; the second connecting member is arranged at one end of the second supporting member and is detachably connected to the cable in a vertical manner; a cavity is arranged inside the second supporting member, which is sleeved in the sleeve and is slidably connected to the sleeve;

[0008] The friction resistance increasing mechanism comprises: a wedge-shaped rotating plate, a wedge-shaped constraint steel plate, a pre-tightening bolt, a disc spring, a ball nut and a ball screw; the ball nut is arranged in the cavity of the second support member and is close to one side of the first support member; one end of the ball screw is rotatably connected to the first support member through a plurality of ball bearings, and the other end passes through the sleeve and falls into the cavity of the second support member and is rotatably connected to the ball nut; the wedge-shaped rotating plate is fixedly sleeved on the outside of the ball screw and arranged in the cavity of the first support member; a plurality of the wedge-shaped constraint steel plates are sleeved on the outside of the ball screw and are respectively arranged on both sides of the wedge-shaped rotating plate through the pre-tightening bolts; disc springs are arranged between the two ends of the pre-tightening bolt and the outsides of the two wedge-shaped constraint steel plates;

[0009] The cables are vertically connected through the support mechanism and the friction resistance increasing mechanism is placed inside the support mechanism. At the same time, the overall volume of the friction damper is reduced by increasing the friction resistance in a rotational manner perpendicular to the amplitude direction of the two cables and amplifying the rotational friction torque.

[0010] Furthermore, the friction resistance increasing mechanism comprises a limit plate, and the limit plate is arranged at the end of the ball screw;

[0011] The length of the ball screw enables the limit plate to fall into the sleeve.

[0012] Furthermore, a rib is provided at the end of the sleeve by means of bolts, and the inner length of the sleeve is such that when the second support member contacts the rib, the ball nut and the ball screw remain rotationally connected.

[0013] Furthermore, the contact area between the ball screw and the two ball bearings, and the outer side of the ball screw disposed inside the first support member are all smooth surfaces.

[0014] Furthermore, there is at least one wedge-shaped rotating plate and at least two wedge-shaped constraining steel plates.

[0015] Furthermore, the wedge-shaped constraint steel plate is mainly composed of a support plate and a wedge-shaped plate, the size of the support plate is larger than the size of the wedge-shaped plate and the shape of the support plate is adapted to the polygonal inner cavity of the first support member.

[0016] Furthermore, the wedge-shaped rotating plate is a disk with wedge-shaped surfaces on both sides, and is compatible with the wedge-shaped plate of the wedge-shaped constraint steel plate;

[0017] The wedge-shaped areas on both sides of the wedge-shaped rotating plate are provided with friction materials including metal materials or composite materials.

[0018] Furthermore, there is at least one disc spring between the pre-tightening bolt and the outer side of the wedge-shaped constraint steel plate.

[0019] Furthermore, the first connecting member and the second connecting member are connected to the cable by a detachable connection method including: a clamp type joint, a screw buckle joint or a clasp joint;

[0020] There is at least one first connecting member and at least one second connecting member.

[0021] Furthermore, the first connecting member is higher than the second connecting member.

[0022] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0023] 1. The friction damper of the present invention directly vertically connects the cables through the support mechanism and places the friction resistance increasing mechanism inside the support mechanism, so as to avoid the situation where the friction resistance increasing mechanism contacts the cables and may cause the stability of the friction damper to be reduced. At the same time, by converting the resistance increasing mode of the traditional friction damper and the vibration reduction object moving towards each other into a rotational friction resistance increasing mode perpendicular to the amplitude direction of the two cables, and amplifying the rotational friction torque, the overall volume of the friction damper is significantly reduced when the vibration reduction effect is achieved, thereby effectively reducing the overall volume of the friction damper, reducing the difficulty of installing the friction damper between the cables, and further improving the practicality and application scenarios of the friction damper.

[0024] 2. The friction damper of the present invention is stably connected and adapted to the cables of different diameters through the first connecting member and the second connecting member, thereby ensuring the tightness and reliability of the connection, and allowing the second supporting member to slide in the sleeve of the first supporting member, thereby driving the friction resistance increasing mechanism to slow down the vibration of the two cables and reduce the negative impact of the large vibration of the cables on the stability of the cables, thereby improving the overall safety and service life of the bridge. Secondly, the two cables are respectively connected through the supporting mechanism to avoid the friction resistance increasing mechanism from being directly connected to the cables, which not only reduces the direct stress on the friction resistance increasing mechanism, but also reduces the risk of early damage to the friction damper caused by the vibration of the cables, thereby enabling the friction damper to play a role in a wider range of application scenarios, such as strong winds, earthquakes or traffic loads, and maintain its efficient vibration control performance.

[0025] 3. The friction damper of the present invention converts the vibration of the cable into relative sliding between the first support member and the second support member through the support mechanism, so that the second support member drives the ball nut to slide along the ball screw and drives the ball screw to rotate, thereby causing friction torque to be generated between the wedge-shaped rotating plate and the wedge-shaped constraint steel plate, thereby increasing the friction area without increasing the installation space in the same direction as the cable amplitude, effectively avoiding the problem of limited damping force of traditional cable-to-cable friction dampers due to insufficient installation space, and at the same time, the rotational friction torque is amplified by the ball nut and the ball screw and converted several times into damping The force is increased, which significantly improves the resistance-increasing effect and further hinders the relative movement of the first support member and the second support member, thereby reducing the vibration amplitude of the cable; secondly, when the wedge-shaped rotating plate rotates relative to the wedge-shaped constraint steel plate, the wedge surfaces of the two cooperate to produce horizontal relative displacement, so that the disc spring between the pre-tightening bolt and the outer side of the wedge-shaped constraint steel plate is compressed, thereby providing a restoring force, realizing a self-resetting function, reducing maintenance costs, and improving the reliability of the device; in addition, when the ball screw moves, the inertial mass of the wedge-shaped rotating component will be amplified, thereby producing a negative stiffness effect, further limiting the relative movement of the first support member and the second support member, and effectively improving the energy consumption effect.

[0026] 4. The friction damper of the present invention is configured by setting a rib at the end of the sleeve by means of bolts, and the internal length of the sleeve is such that when the second support member contacts the rib, the ball nut and the ball screw maintain a rotational connection, thereby preventing the second support member from sliding out of the sleeve and the ball nut from hitting the limit plate, causing the stability of the friction resistance increasing mechanism to be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of a friction damper according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the assembly of the wedge-shaped rotating plate and the wedge-shaped restraining steel plate according to an embodiment of the present invention;

[0029] Figure 3 A cross-sectional view of a friction damper provided with a rib according to an embodiment of the present invention.

[0030] In all the drawings, the same figure marks represent the same technical features, specifically: 1-first connecting member, 2-second connecting member, 3-first supporting member, 31-sleeve, 311-guard, 4-second supporting member, 5-cable, 6-wedge-shaped rotating plate, 7-wedge-shaped constraint steel plate, 8-pre-tightening bolt, 9-disc spring, 10-ball nut, 11-ball screw, 12-limiting plate, 13-ball bearing. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] like Figures 1 to 3 As shown, an embodiment of the present invention provides a self-resetting inertia friction damper for cable vibration reduction, comprising: a support mechanism and a friction resistance increasing mechanism; two cables 5 are vertically connected at both ends of the support mechanism; and the friction resistance increasing mechanism is arranged inside the support mechanism. In actual use, the cables 5 are directly vertically connected by the support mechanism and the friction resistance increasing mechanism is placed inside the support mechanism to avoid the friction resistance increasing mechanism contacting the cables 5, which may cause the stability of the friction damper to be reduced. At the same time, by converting the resistance increasing mode of the traditional friction damper and the vibration reduction object moving toward each other into a rotational friction resistance increasing mode perpendicular to the amplitude direction of the two cables 5, and amplifying the rotational friction torque, the overall volume of the friction damper is significantly reduced when the vibration reduction effect is achieved, thereby effectively reducing the overall volume of the friction damper, reducing the difficulty of installing the friction damper between the cables 5, and further improving the practicality and application scenarios of the friction damper.

[0033] Specifically, Figure 1As shown, two cables are vertically connected at both ends of the support mechanism, which are used to stably connect the two cables 5 and support the friction resistance increasing mechanism, so as to ensure the stable operation of the entire friction damper. The support mechanism includes: a first connecting member 1, a second connecting member 2, a first supporting member 3 and a second supporting member 4; the first connecting member 1 is arranged at one end of the first supporting member 3 and is detachably vertically connected to one of the cables 5; a polygonal cavity is provided inside the first supporting member 3, and a sleeve 31 is provided at the other end of the first supporting member 3; the second connecting member 2 is arranged at one end of the second supporting member 4 and is detachably vertically connected to one of the cables 5; a cavity is provided inside the second supporting member 4, which is sleeved in the sleeve 31 and is slidably connected to the sleeve 31. During actual use, the first connecting member 1 and the second connecting member 2 are used to stably connect and adapt the cables 5 of different diameters to ensure the tightness and reliability of the connection, and enable the second supporting member 4 to slide in the sleeve 31 of the first supporting member 3, thereby driving the friction resistance increasing mechanism to slow down the vibration of the two cables 5 and reduce the negative impact of the large vibration of the cables 5 on the stability of the cables, thereby improving the overall safety and service life of the bridge. Secondly, the two cables 5 are connected separately through the supporting mechanism to avoid the friction resistance increasing mechanism from being directly connected to the cables 5, which not only reduces the direct stress on the friction resistance increasing mechanism, but also reduces the risk of early damage to the friction damper caused by the vibration of the cables 5, so that the friction damper can play a role in a wider range of application scenarios, such as strong winds, earthquakes or traffic loads, and maintain its efficient vibration control performance.

[0034] Preferably, the first connecting member 1 and the second connecting member 2 are vertically connected to the cable 5 through a detachable connection method including: a clamp-type joint, a screw joint or a clasp joint.

[0035] Preferably, there are at least one first connecting member 1 and at least one second connecting member 2 , respectively, for enhancing the connection stability between the first connecting member 1 and the second connecting member 2 and the cable 5 .

[0036] Preferably, the first connecting member 1 is higher than the second connecting member 2, so as to reduce the possibility of debris entering the sleeve 31, enhance the stability of the friction damper, and extend the service life.

[0037] Preferably, the outer shapes of the first support member 3 and the sleeve 31 include a circle or an ellipse, so as to reduce wind resistance and subsequent cleaning and maintenance costs.

[0038] Preferably, the exterior of the second support member 4 and the interior of the sleeve 31 are cylindrical, so as to ensure the stability of the sliding connection therebetween.

[0039] Preferably, the outer dimension of the second support member 4 is matched with the inner dimension of the sleeve 31 to avoid collision damage between the second support member 4 and the sleeve 31 and ensure stable sliding.

[0040] Specifically, Figures 1 to 3 As shown, the friction resistance increasing mechanism is arranged inside the supporting mechanism, and is used to reduce the vibration amplitude of the cable 5 through rotational friction. The friction resistance increasing mechanism includes: a wedge-shaped rotating plate 6, a wedge-shaped constraint steel plate 7, a pre-tightening bolt 8, a disc spring 9, a ball nut 10, a ball screw 11 and a limit plate 12; the ball nut 10 is arranged in the cavity of the second support member 4 and close to the side of the first support member 3; one end of the ball screw 11 is rotatably connected to the first support member 3 through a plurality of ball bearings 13, and the other end passes through the sleeve 31 and falls into the cavity of the second support member 4 and is rotatably connected to the ball nut 10; the limit plate 12 is arranged at the end of the ball screw 11; the wedge-shaped rotating plate 6 is fixedly sleeved on the outside of the ball screw 11 and arranged in the cavity of the first support member 3; a plurality of the wedge-shaped constraint steel plates 7 are sleeved on the outside of the ball screw 11, and are respectively arranged on both sides of the wedge-shaped rotating plate 6 through the pre-tightening bolts 8; a disc spring 9 is arranged between the two ends of the pre-tightening bolt 8 and the outsides of the two wedge-shaped constraint steel plates 7. In actual use, the vibration of the cable 5 is converted into relative sliding between the first support member 3 and the second support member 4 through the support mechanism, so that the second support member 4 drives the ball nut 10 to slide along the ball screw 11 and drives the ball screw 11 to rotate, so that friction torque is generated between the wedge-shaped rotating plate 6 and the wedge-shaped constraint steel plate 7, thereby increasing the friction area without increasing the installation space in the same amplitude direction as the cable 5, effectively avoiding the problem of limited damping force of the traditional cable-to-cable friction damper due to insufficient installation space. At the same time, the rotational friction torque is amplified and converted several times through the ball nut 10 and the ball screw 11. The damping force significantly improves the resistance-increasing effect, further hinders the relative movement of the first support member 3 and the second support member 4, thereby reducing the vibration amplitude of the cable 5; secondly, when the wedge-shaped rotating plate 6 rotates relative to the wedge-shaped constraint steel plate 7, the horizontal relative displacement is generated due to the cooperation of the wedge surfaces of the two, so that the disc spring 9 between the pre-tightening bolt 8 and the outer side of the wedge-shaped constraint steel plate 7 is compressed, thereby providing a restoring force, realizing a self-resetting function, reducing maintenance costs, and improving the reliability of the device; in addition, when the ball screw 11 moves, the inertial mass of the wedge-shaped rotating component will be amplified, thereby producing a negative stiffness effect, further limiting the relative movement of the first support member 3 and the second support member 4, and effectively improving the energy consumption effect.

[0041] Preferably, the length of the ball screw 11 enables the limit plate 12 to fall into the sleeve 31, so as to prevent the second support member 4 from sliding out of the sleeve 31, thereby enhancing the stability of the friction damper.

[0042] Preferably, the contact areas between the ball screw 11 and the two ball bearings 13, and the outer side of the ball screw 11 disposed inside the first support member 3 are all smooth surfaces, so as to enhance the degree of fit between the ball screw 11 and other components and improve the stability of the friction damper.

[0043] In an optional embodiment, a rib 311 is provided at the end of the sleeve 31 by means of bolts, and the internal length of the sleeve 31 is such that when the second support member 4 contacts the rib 311, the ball nut 10 maintains a rotational connection with the ball screw 11, thereby preventing the second support member 4 from sliding out of the sleeve 31 and the ball nut 10 from hitting the limit plate 12, causing the stability of the friction resistance increasing mechanism to be reduced, and at the same time, facilitating the adjustment of the initial state of the support mechanism.

[0044] Preferably, there is at least one wedge-shaped rotating plate 6 and at least two wedge-shaped restraining steel plates 7, which are used to increase friction resistance.

[0045] Preferably, the wedge-shaped constraint steel plate 7 is mainly composed of a support plate and a wedge plate. The size of the support plate is larger than that of the wedge plate and the shape of the support plate is adapted to the polygonal inner cavity of the first support member 3, so as to limit the rotation of the wedge-shaped constraint steel plate 7 in the first support member 3 and enable it to slide only along the ball screw 11.

[0046] Preferably, the wedge-shaped rotating plate 6 is a disk with wedge-shaped surfaces on both sides, and is matched with the wedge-shaped plate of the wedge-shaped constraint steel plate 7 to stably form friction resistance.

[0047] Preferably, the wedge-shaped areas on both sides of the wedge-shaped rotating plate 6 are provided with friction materials including metal materials or composite materials, so as to ensure the rotational friction stability with the wedge-shaped constraint steel plate 7 and improve the service life of the friction damper.

[0048] Preferably, there is at least one disc spring 9 between the pre-tightening bolt 8 and the outer side of the wedge-shaped constraint steel plate 7, which is used to enhance the self-recovery ability of the friction resistance increasing mechanism.

[0049] The working principle of the friction damper of the present invention is as follows: the initial state of the ball nut 10 and the ball screw 11 is adjusted by the distance between the two cables 5, that is, the position of the second support member 4 in the sleeve 31, so that the friction damper can adapt to the cables with different spacings. After that, the first connecting member 1 and the second connecting member 2 are respectively vertically connected to the cables 5, so that the friction damper is vertically arranged between the two cables 5 as a whole; when the two cables 5 vibrate, the cables 5 drive the second support member 4 to slide in the sleeve 31, so that the ball nut 10 drives the ball screw 11 to rotate, and the wedge-shaped rotating plate 6 synchronously follows the rotation of the ball screw 11 , thereby causing relative rotation with the wedge-shaped constraint steel plate 7 that does not rotate in the first support member 3 to generate a friction torque, and then the friction torque is amplified by the ball nut 10 and the ball screw 11, and the sliding of the second support member 4 in the sleeve 31 is restricted, thereby effectively reducing the vibration amplitude between the two cables 5. At the same time, by increasing the size of the wedge-shaped rotating plate 6 and the wedge-shaped constraint steel plate 7 to increase the friction area, the vibration reduction effect of the friction damper can be further improved; and when a plurality of the friction dampers are installed between a plurality of adjacent cables 5, the vibration amplitude of all the cables 5 can be further reduced, the bridge maintenance cost can be reduced, and the service life of the bridge can be increased.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Those skilled in the art will readily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A self-resetting inertia friction damper for cable vibration reduction, characterized in that: include: Support mechanism and friction resistance increasing mechanism, wherein: The support mechanism comprises: a first connecting member (1), a second connecting member (2), a first supporting member (3) and a second supporting member (4); the first connecting member (1) is arranged at one end of the first supporting member (3) and is detachably connected vertically to a cable (5); a polygonal cavity is arranged inside the first supporting member (3), and a sleeve (31) is arranged at the other end of the first supporting member (3); the second connecting member (2) is arranged at one end of the second supporting member (4) and is detachably connected vertically to the cable (5); a cavity is arranged inside the second supporting member (4), which is sleeved in the sleeve (31) and is slidably connected to the sleeve (31); The friction resistance increasing mechanism comprises: a wedge-shaped rotating plate (6), a wedge-shaped restraining steel plate (7), a pre-tightening bolt (8), a disc spring (9), a ball nut (10) and a ball screw (11); the ball nut (10) is arranged in the cavity of the second support member (4) and close to the first support member (3); one end of the ball screw (11) is rotatably connected to the first support member (3) through a plurality of ball bearings (13), and the other end passes through the sleeve (31) and falls into the second support member (4). The wedge-shaped rotating plate (6) is fixedly sleeved on the outside of the ball screw (11) and arranged in the cavity of the first supporting member (3); a plurality of wedge-shaped restraining steel plates (7) are sleeved on the outside of the ball screw (11) and are respectively arranged on both sides of the wedge-shaped rotating plate (6) through the pre-tightening bolts (8); disc springs (9) are arranged between the two ends of the pre-tightening bolts (8) and the outsides of the two wedge-shaped restraining steel plates (7); The cables (5) are vertically connected via the support mechanism and the friction resistance increasing mechanism is placed inside the support mechanism. At the same time, the overall volume of the friction damper is reduced by increasing the friction resistance in a rotational manner perpendicular to the amplitude direction of the two cables (5) and amplifying the rotational friction torque.

2. The friction damper according to claim 1, characterized in that: The friction resistance increasing mechanism comprises a limit plate (12), and the limit plate (12) is arranged at the end of the ball screw (11); The length of the ball screw (11) enables the limiting plate (12) to fall into the sleeve (31).

3. The friction damper according to claim 1, characterized in that: The end of the sleeve (31) is provided with a retaining edge (311) by means of bolts, and the internal length of the sleeve (31) is such that when the second support member (4) contacts the retaining edge (311), the ball nut (10) and the ball screw (11) maintain a rotational connection.

4. The friction damper according to any one of claims 1 to 3, characterized in that: The contact area between the ball screw (11) and the two ball bearings (13), as well as the outer side of the ball screw (11) arranged inside the first support member (3) are all smooth surfaces.

5. The friction damper according to any one of claims 1 to 3, characterized in that: There is at least one wedge-shaped rotating plate (6) and at least two wedge-shaped restraining steel plates (7).

6. The friction damper according to any one of claims 1 to 3, characterized in that: The wedge-shaped restraining steel plate (7) is mainly composed of a support plate and a wedge-shaped plate. The size of the support plate is larger than that of the wedge-shaped plate and the shape of the support plate is compatible with the polygonal inner cavity of the first support member (3).

7. The friction damper according to claim 5, characterized in that: The wedge-shaped rotating plate (6) is a disk with wedge-shaped surfaces on both sides, and is compatible with the wedge-shaped plate of the wedge-shaped restraining steel plate (7); The wedge-shaped areas on both sides of the wedge-shaped rotating plate (6) are provided with friction materials including metal materials or composite materials.

8. The friction damper according to any one of claims 1 to 3, characterized in that: There is at least one disc spring (9) between the pre-tightening bolt (8) and the outer side of the wedge-shaped restraining steel plate (7).

9. The friction damper according to any one of claims 1 to 3, characterized in that: The first connecting member (1) and the second connecting member (2) are connected to the cable (5) by a detachable connection method including: a clamp-type joint, a screw-type joint or a snap-ring joint; There is at least one first connecting member (1) and at least one second connecting member (2).

10. The friction damper according to any one of claims 1 to 3, characterized in that: The first connecting member (1) is higher than the second connecting member (2).

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