A low prestressed self-resetting asymmetric friction damping shock-absorbing device

Abstract

The present invention relates to a low-prestress, self-resetting asymmetric friction damping shock-absorbing device, comprising an outer tube, an asymmetric damping unit, and a self-resetting unit. The outer tube is sealed at one end and has an opening at the other. The asymmetric damping unit is connected in series with the self-resetting unit. Both the asymmetric damping unit and the self-resetting unit are movably fixed within the outer tube, with the asymmetric damping unit located at the sealed end of the outer tube and the self-resetting unit located at the open end. When the device is subjected to tension, the asymmetric damping unit generates friction damping, and the self-resetting unit generates an elastic restoring force. When the device is subjected to pressure, the asymmetric damping unit does not generate friction damping, and the self-resetting unit does not generate an elastic restoring force. Compared with the prior art, the present invention has the advantages of tensile and compressive asymmetric damping performance, low prestress, and self-resetting.

Description

Technical Field

[0001] The present invention relates to the technical field of earthquake-resistant structures, in particular to a low-prestressed self-resetting asymmetric friction damping shock-absorbing device. Background Art

[0002] Earthquakes can be devastating, damaging structures and incurring enormous repair costs. In rare or even extremely rare earthquakes, structures can experience significant plastic deformation or even collapse, leading to significant casualties and economic losses. The use of additional damping devices, particularly those with self-resetting capabilities, is an effective means of improving structural seismic resilience, ensuring the safety of people and property, and enabling rapid restoration of structural functionality after an earthquake.

[0003] Many damping devices and self-resetting damping devices are bidirectional damping devices, meaning they operate equally well in both the tensile and compressive directions. While these devices offer excellent bidirectional performance, they are also bulky and heavy due to the need to account for overall buckling in the compressive direction. Due to their size, bidirectional damping devices are difficult to apply to industrial structures and large-span structures. They can be used in some building reinforcement projects where space is limited. However, due to their weight, they are difficult to transport and install manually.

[0004] In recent years, the damping cable formed by connecting asymmetric damping devices in series with the cable only works when under tension, without considering the buckling problem; after symmetrical arrangement, it has the characteristics of beautiful appearance, clear mechanism, and convenient transportation and installation; self-resetting damping cable can also be formed by adding self-resetting modules.

[0005] Damping cables partially solve the limitations of bidirectional damping devices, but the following problems still exist:

[0006] (1) The damping cable formed by connecting traditional viscous and friction dampers in series with cables requires high prestress to maintain its unidirectional working capacity. High prestress weakens the energy dissipation capacity of the damping cable. At the same time, the danger of high prestress and the problem of working capacity failure after prestress loss limit its application.

[0007] (2) Damping cables made using the metal yield damping mechanism are subject to the strain accumulation effect of the metal during the increase of the working stroke, which may cause fracture and damage to the damping cable;

[0008] (3) A small number of existing low prestressed asymmetric friction dampers have performance defects, large size, heavy mass, complex structure, and free space, making them difficult to apply.

[0009] Therefore, there is an urgent need for a friction damping device with low prestress, simple structure, light weight and self-resetting capability. Summary of the Invention

[0010] The purpose of the present invention is to overcome the defect of the above-mentioned prior art that the damping cable formed by the traditional viscosity and friction damper in series with the cable requires additional high prestress to maintain its unidirectional working ability, and to provide a low prestress, simple and lightweight low prestress self-resetting asymmetric friction damping shock absorbing device.

[0011] The purpose of the present invention can be achieved by the following technical solutions:

[0012] A low prestressed, self-resetting, asymmetric friction damping shock-absorbing device comprises an outer tube, an asymmetric damping unit, and a self-resetting unit. One end of the outer tube is sealed, and the other end is provided with an opening. The asymmetric damping unit is connected in series with the self-resetting unit. Both the asymmetric damping unit and the self-resetting unit are slidably fixed inside the outer tube. The asymmetric damping unit is located at the sealed end of the outer tube, and the self-resetting unit is located at the open end of the outer tube.

[0013] When the device is subjected to tension, the asymmetric damping unit generates friction damping and the self-resetting unit generates elastic restoring force. After the tension applied to the device is removed, the asymmetric damping unit and the self-resetting unit are reset under the action of the elastic restoring force.

[0014] Preferably, the asymmetric damping unit includes an upper wedge block, a lower wedge block and a wedge block sleeve, the upper end of the wedge block sleeve is provided with a wedge block mounting groove, the lower wedge block is located in the wedge block mounting groove, the lower wedge block includes a large end and a small end, the upper surface of the lower wedge block is provided with a wedge block mounting groove, the right end of the upper wedge block is located in the upper wedge block mounting groove, and one side is against the side wall of the upper wedge block mounting groove, the bottom surface of the wedge block mounting groove is a first inclined surface, which is inclined downward from the large end to the small end, and the large end is located at the sealing end of the outer cylinder, and the lower surface of the upper wedge block is provided with a second inclined surface matching the first inclined surface, and the first inclined surface is slidably connected to the second inclined surface.

[0015] Preferably, the asymmetric damping unit also includes an upper friction plate and a lower friction plate, the upper friction plate is fixed to the upper end of the upper wedge block, and the upper surface of the upper friction plate is against the upper side of the inner wall of the outer cylinder, and the lower friction plate is fixed to the lower end of the wedge block sleeve, and the lower surface of the lower friction plate is against the lower side of the inner wall of the outer cylinder.

[0016] Preferably, an upper friction plate mounting groove is provided at the upper end of the upper wedge block, and a lower friction plate mounting groove is provided at the lower end of the wedge block sleeve; the upper friction plate is located in the upper friction plate mounting groove, and the upper end surface of the upper friction plate is flush with the upper end surface of the upper wedge block; the lower friction plate is located in the lower friction plate mounting groove, and the lower end surface of the lower friction plate is flush with the lower end surface of the wedge block sleeve.

[0017] Preferably, a spring mounting groove is provided in the wedge block mounting groove, and the lower end of the lower wedge block is provided with a clamping end corresponding to the shape of the spring mounting groove; a preload spring is provided in the spring mounting groove, and the clamping end is located on the preload spring and compresses the preload spring.

[0018] Preferably, there are multiple spring installation slots, and there are multiple springs in each spring installation slot.

[0019] Preferably, the self-reset unit includes a reset spring and a stopper, and the asymmetric damping unit further includes a transmission rod and a cable connecting plate;

[0020] One end of the transmission rod is connected to the wedge sleeve, and the other end is connected to the cable connecting plate. The stop block is fixed on the transmission rod, and the return spring sleeve is arranged on the transmission rod. One end of the return spring abuts against the stop block, and the other end abuts against the inner side of the open end of the outer tube. The cable connecting plate is connected to external equipment.

[0021] Preferably, a connecting plate is provided on the outer side of the sealing end of the outer cylinder, and the outer cylinder is connected to an external device through the first connecting plate.

[0022] Preferably, the outer cylinder includes a first cylinder and a second cylinder connected to each other, the first cylinder and the second cylinder are coaxially fixed, the asymmetric damping unit is located inside the first cylinder, and the self-resetting unit is located inside the second cylinder.

[0023] Preferably, the connecting ends of the first cylinder and the second cylinder are provided with corresponding fixed ends and bolts, and the fixed ends are connected by bolts.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) This solution generates a large friction damping force by causing the asymmetric damping unit to rub against the outer cylinder when the device is subjected to tension, thereby absorbing the energy generated by the device's vibration and tension, thereby playing a shock-absorbing role. At the same time, the self-resetting unit generates an elastic restoring force under the action of the tension on the device. After the tension on the device is removed, the device resets under the action of the elastic restoring force. This avoids the problem that the damping cable formed by the traditional viscous and friction dampers connected in series with the cable requires high prestress to maintain its unidirectional working ability. It can work under low prestress, while improving the energy dissipation capacity of the damping cable and improving the safety and reliability of the device.

[0026] (2) In this solution, the asymmetric damping unit is assembled by an upper wedge, a lower wedge and a wedge sleeve, and a preload spring is set between the lower wedge and the wedge sleeve. The overall structure is simple and the installation and disassembly are convenient and quick. At the same time, the assembled structure allows the preload spring to be set to ensure the friction between the upper wedge and the wedge sleeve and the outer cylinder, thereby ensuring the ability of the asymmetric damping unit to provide additional damping, avoiding the problem of high precision requirements and low life of the parts in the overall setting, effectively extending the service life of the parts and reducing the cost of the device.

[0027] (3) This solution sets an outer cylinder on the outside of the asymmetric damping unit and the self-resetting unit. On the one hand, it provides support for the internal structure. On the other hand, it places the internal structure in a relatively closed space, ensuring the cleanliness and dust-freeness of the internal space, effectively reducing the influence of the external environment on the internal parts, and having greater adaptability.

[0028] (4) In this solution, the outer cylinder is formed by splicing the first cylinder and the second cylinder, which makes it easy to install the internal structure into the outer barrel, effectively improving the assembly efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of the friction damping device provided by the present invention;

[0030] Figure 2 Schematic diagram of an asymmetric friction damper that provides energy dissipation capability for the device provided by the present invention;

[0031] Figure 3 The hysteresis curve of the damping device provided by the present invention under the action of reciprocating load;

[0032] Figure 4 A schematic diagram of the application structure of the damping device provided by the present invention in a low-rise frame structure;

[0033] Figure 5 A schematic diagram of the application structure of the device provided by the present invention in a complex ultra-high-rise flexible structure;

[0034] Figure: 1. Outer cylinder, 2. Asymmetric damping unit, 3. Self-reset unit, 11. First connecting plate, 12. First cylinder, 13. Second cylinder, 21. Upper wedge, 22. Lower wedge, 23. Wedge sleeve, 24. Upper friction plate, 25. Lower friction plate, 26. Preload spring, 27. Transmission rod, 28. Cable connecting plate, 31. Return spring, 32. Stopper, 221. Large end, 222. Small end, 223. Pressing end, 231. Wedge mounting slot, 2311. Spring mounting slot, 4. Damping and shock absorbing device, 5. Flexible support, 6. Outrigger truss, 7. First friction surface, 8. Second friction surface, 9. Third friction surface. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0039] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0040] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0041] Example 1

[0042] This embodiment provides a low prestressed self-resetting asymmetric friction damping shock absorbing device, such as Figure 1As shown, it includes an outer tube 1, an asymmetric damping unit 2 and a self-resetting unit 3. One end of the outer tube 1 is sealed and the other end is provided with an opening. The asymmetric damping unit 2 is connected in series with the self-resetting unit 3. Both the asymmetric damping unit 2 and the self-resetting unit 3 can be slidably fixed inside the outer tube 1. The asymmetric damping unit 2 is located at the sealed end of the outer tube 1, and the self-resetting unit 3 is located at the open end of the outer tube 1.

[0043] When the device is subjected to tension, the asymmetric damping unit 2 generates friction damping and the self-resetting unit 3 generates elastic restoring force. After the tension applied to the device is removed, the asymmetric damping unit 2 and the self-resetting unit 3 are reset under the action of the elastic restoring force.

[0044] Working principle: When the device is subjected to tension, the asymmetric damping unit 2 rubs against the outer cylinder 1, thereby generating a large friction damping force, absorbing the energy generated by the vibration of the device under tension, and playing a shock-absorbing role; at the same time, the self-resetting unit 3 generates an elastic restoring force under the action of the tension on the device. After the tension on the device is removed, the device resets under the action of the elastic restoring force.

[0045] This solution generates a high friction damping force when the device is subjected to tension, through friction between the asymmetric damping unit 2 and the outer cylinder 1. This absorbs the energy generated by the device's vibration and tension, thus providing a shock-absorbing effect. Simultaneously, the self-resetting unit 3 generates an elastic restoring force under the tension applied to the device. Once the tension is removed, the device resets under the elastic restoring force. This avoids the problem of traditional damping cables, which require high prestress to maintain unidirectional working capacity, by connecting viscous and friction dampers in series. This solution can operate with low prestress, improving the energy dissipation and seismic resistance of the damping cable, and enhancing the safety and reliability of the device.

[0046] As a preferred embodiment, the asymmetric damping unit 2 includes an upper wedge block 21, a lower wedge block 22 and a wedge block sleeve 23. The upper end of the wedge block sleeve 23 is provided with a wedge block mounting groove 231. The lower wedge block 22 is located in the wedge block mounting groove 231. The two sides of the wedge block mounting groove 231 limit the axial displacement of the lower wedge block 22. The lower wedge block 22 includes a large end 221 and a small end 222. The upper surface of the lower wedge block 22 is provided with a wedge block mounting groove. The right end of the upper wedge block 21 is located in the upper wedge block mounting groove, and one side is against the side wall of the upper wedge block mounting groove. The bottom surface of the wedge block mounting groove is a first inclined surface, which is inclined downward from the large end 221 to the small end 222. The large end 221 is located at the sealing end of the outer tube 1. The lower surface of the upper wedge block 21 is provided with a second inclined surface matching the first inclined surface, and the first inclined surface is slidably connected to the second inclined surface.

[0047] The asymmetric damping unit 2 also includes an upper friction plate 24 and a lower friction plate 25. The upper friction plate 24 is fixed to the upper end of the upper wedge block 21, and the upper surface of the upper friction plate 24 is against the upper side of the inner wall of the outer cylinder 1. The lower friction plate 25 is fixed to the lower end of the wedge block sleeve 23, and the lower surface of the lower friction plate 25 is against the lower side of the inner wall of the outer cylinder 1.

[0048] An upper friction plate mounting groove is provided at the upper end of the upper wedge block 21, and a lower friction plate mounting groove is provided at the lower end of the wedge block sleeve 23; the upper friction plate 24 is located in the upper friction plate mounting groove, and the upper end surface of the upper friction plate 24 is flush with the upper end surface of the upper wedge block 21; the lower friction plate 25 is located in the lower friction plate mounting groove, and the lower end surface of the lower friction plate 25 is flush with the lower end surface of the wedge block sleeve 23.

[0049] A spring mounting groove 2311 is provided in the wedge block mounting groove 231, and a clamping end 223 corresponding to the shape of the spring mounting groove 2311 is provided at the lower end of the lower wedge block 22; a preload spring 26 is provided in the spring mounting groove 2311, and the clamping end 223 is located on the preload spring 26 and clamps the preload spring 26.

[0050] There are multiple spring mounting slots 2311, and each spring mounting slot 2311 contains multiple springs. Providing multiple spring mounting slots 2311 allows for more preload springs 26 to be installed, thereby increasing the positive pressure between the asymmetric damping unit 2 and the interior of the outer cylinder 1, thereby improving the frictional damping provided by the asymmetric damping unit 2.

[0051] The asymmetric damping unit is assembled by an upper wedge, a lower wedge and a wedge sleeve, and a preload spring is arranged between the lower wedge and the wedge sleeve. The overall structure is simple, and installation and disassembly are convenient and quick. At the same time, the assembled structure enables the preload spring to be arranged thereon to ensure the friction between the upper wedge and the wedge sleeve and the outer cylinder, thereby ensuring the ability of the asymmetric damping unit to provide additional damping, avoiding the problem of high precision requirements and low life of parts for the overall setting, effectively extending the service life of parts and reducing the cost of the device.

[0052] As a preferred embodiment, the self-reset unit 3 includes a reset spring 31 and a stopper 32, and the asymmetric damping unit 2 also includes a transmission rod 27 and a cable connecting plate 28;

[0053] One end of the transmission rod 27 is connected to the wedge sleeve 23, and the other end is connected to the cable connecting plate 28. The stopper 32 is fixed on the transmission rod 27. The return spring 31 is sleeved on the transmission rod 27. One end of the return spring 31 abuts against the stopper 32, and the other end abuts against the inner side of the open end of the outer tube 1. The cable connecting plate 28 is connected to external equipment.

[0054] When the device is subjected to tension through the first connecting plate 11 and the cable connecting plate 28, the stopper 32 approaches the inner side of the open end and squeezes the return spring 31, causing it to produce elastic deformation. When the tension is removed, the device is reset by the return spring 31.

[0055] A first connecting plate 11 is provided on the outer side of the sealing end of the outer cylinder 1 , and the outer cylinder 1 is connected to external equipment via the first connecting plate.

[0056] An outer cylinder is set on the outside of the asymmetric damping unit and the self-resetting unit. On the one hand, it provides support for the internal structure. On the other hand, it places the internal structure in a relatively closed space, ensuring the cleanliness and dust-freeness of the internal space, effectively reducing the influence of the external environment on internal parts, and having greater adaptability.

[0057] As a preferred embodiment, the outer cylinder 1 includes a first cylinder 12 and a second cylinder 13 connected to each other, the first cylinder 12 and the second cylinder 13 are coaxially fixed, the asymmetric damping unit 2 is located inside the first cylinder 12, and the self-resetting unit 3 is located inside the second cylinder 13.

[0058] The connecting ends of the first barrel 12 and the second barrel 13 are provided with corresponding fixed ends and bolts, and the fixed ends are connected by bolts. The outer barrel is formed by splicing the first barrel 12 and the second barrel 13, which facilitates the installation of the internal structure into the inner part of the outer barrel, effectively improving the assembly efficiency of the device.

[0059] In this embodiment, if Figure 2 As shown, an upper wedge block mounting groove is provided on the lower wedge block 22. The upper wedge block 21 is formed by fitting the second inclined surface to the first inclined surface so that its larger end is located in the upper wedge block mounting groove and one side is against the side wall of the upper wedge block mounting groove. At the same time, the first inclined surface and the second inclined surface are stepped inclined surfaces with corresponding shapes, which in turn ensure the stable fit of the upper wedge block 21 and the lower wedge block 22.

[0060] In combination with the above preferred implementations, this embodiment further provides an optimal implementation, specifically:

[0061] In a qualitative embodiment of the present invention, as shown in Figure 1, this embodiment discloses a low prestressed self-resetting asymmetric friction damping device, which includes: an outer cylinder, an asymmetric damping unit, a self-resetting unit, and an asymmetric friction damping unit, wherein the asymmetric damping unit includes a transmission rod, a block and a cable connecting plate; the self-resetting unit includes a group of axial springs; the asymmetric friction damping unit includes an upper wedge block, a lower wedge block, a wedge block sleeve, a radial preload spring, an upper friction plate and a lower friction plate.

[0062] Furthermore, when the device is subjected to tension, its axial spring is compressed to generate elastic restoring force, and the asymmetric friction damping unit generates damping force, and the output of the device is very large; when the device is subjected to pressure, its axial spring does not generate elastic restoring force, and the asymmetric friction damping unit does not generate damping force, and at this time the output of the device is almost 0.

[0063] As shown in Figure 2, the schematic diagram of the asymmetric friction damping unit, the upper boundary and the lower boundary represent the outer cylinder of the device, the upper wedge represents the upper wedge and upper friction plate of the device, the lower wedge represents the lower wedge, wedge sleeve and lower friction plate of the device, and the radial preload spring represents the radial preload spring or disc spring.

[0064] Among them, the friction surface of the upper wedge block and the lower wedge block of the device corresponds to the first friction surface 7, and the friction coefficient is The friction surface of the outer cylinder of the device and the upper friction plate corresponds to the second friction surface 8, and the friction coefficient is The friction surface of the outer cylinder and the lower friction plate of the device corresponds to the third friction surface 9, and the friction coefficient is ; The stiffness of the radial preload spring is ; The inclination angles of the upper and lower wedges are ; The horizontal length of the gap between the upper wedge and the lower wedge is .

[0065] Far greater than and . 、 、 for 、 、 The corresponding friction angle is 、 、 .and 、 、 Should meet the following requirements:

[0066]

[0067] The stiffness of the axial spring in this embodiment is .

[0068] Specifically, the hysteresis curve of the low prestressed self-resetting asymmetric friction damping device under the action of low cyclic reciprocating load of ±100mm is as follows: Figure 3 shown. is the displacement of the device, is the output of the device. In a hysteresis, the output of the device includes arrive , a total of 8 feature points.

[0069] The calculation expression of is:

[0070]

[0071] The calculation expression of is:

[0072]

[0073] The calculation expression of is:

[0074]

[0075] in, .

[0076] The calculation expression of is:

[0077]

[0078] The calculation expression of is:

[0079]

[0080] The calculation expression of is:

[0081]

[0082] The calculation expression of is:

[0083]

[0084] The calculation expression of is:

[0085]

[0086] The application of low prestressed self-resetting asymmetric friction damping devices in low-rise frame structures, such as Figure 4 As shown, the damping and vibration reduction device 4 is connected in series with the cable (flexible support 5) and applied to the structure. Compared with traditional support forms, this application can improve structural performance without affecting the aesthetics of the building facade. It has a clear mechanical mechanism and no out-of-plane performance. It is also simple and quick to transport and install.

[0087] The application of low prestressed self-resetting asymmetric friction damping devices in complex super-high-rise structural systems, such as Figure 5As shown, the damping and shock-absorbing device 4 can be connected in series with the cable (flexible support 5) and installed on the outermost side of the outrigger truss 6. This amplifies the structural deformation by taking advantage of the long cantilever and high rigidity of the outrigger truss, maximizing the bending deformation of the super-high-rise structure and improving the structural performance.

[0088] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A low prestressed self-resetting asymmetric friction damping shock absorbing device, characterized in that: The invention comprises an outer cylinder (1), an asymmetric damping unit (2) and a self-resetting unit (3); one end of the outer cylinder (1) is sealed and the other end is provided with an opening; the asymmetric damping unit (2) is connected in series with the self-resetting unit (3); both the asymmetric damping unit (2) and the self-resetting unit (3) are movably fixed inside the outer cylinder (1); the asymmetric damping unit (2) is located at the sealed end of the outer cylinder (1), and the self-resetting unit (3) is located at the open end of the outer cylinder (1); When the device is subjected to tension, the asymmetric damping unit (2) generates friction damping, and the self-resetting unit (3) generates elastic restoring force; when the device is subjected to pressure, the asymmetric damping unit does not generate friction damping, and the self-resetting unit does not generate elastic restoring force; The asymmetric damping unit (2) includes an upper wedge (21), a lower wedge (22) and a wedge sleeve (23), the upper end of the wedge sleeve (23) is provided with a wedge mounting groove (231), the lower wedge (22) is located in the wedge mounting groove (231), the lower wedge (22) includes a large end (221) and a small end (222), the upper surface of the lower wedge (22) is provided with a wedge mounting groove, the right end of the upper wedge (21) is located in the upper wedge mounting groove, and one side abuts against the side wall of the upper wedge mounting groove, the bottom surface of the wedge mounting groove is a first inclined surface, the first inclined surface is inclined downward from the large end (221) to the small end (222), the large end (221) is located at the sealing end of the outer cylinder (1), the lower surface of the upper wedge (21) is provided with a second inclined surface matched with the first inclined surface, and the first inclined surface is slidably connected to the second inclined surface; The asymmetric damping unit (2) further comprises an upper friction plate (24) and a lower friction plate (25), wherein the upper friction plate (24) is fixed to the upper end of the upper wedge block (21), and the upper surface of the upper friction plate (24) abuts against the upper side of the inner wall of the outer cylinder (1); and the lower friction plate (25) is fixed to the lower end of the wedge block sleeve (23), and the lower surface of the lower friction plate (25) abuts against the lower side of the inner wall of the outer cylinder (1).

2. A low prestressed self-resetting asymmetric friction damping shock absorbing device according to claim 1, characterized in that: The upper end of the upper wedge block (21) is provided with an upper friction plate mounting groove, and the lower end of the wedge block sleeve (23) is provided with a lower friction plate mounting groove; the upper friction plate (24) is located in the upper friction plate mounting groove, and the upper end surface of the upper friction plate (24) is flush with the upper end surface of the upper wedge block (21); the lower friction plate (25) is located in the lower friction plate mounting groove, and the lower end surface of the lower friction plate (25) is flush with the lower end surface of the wedge block sleeve (23).

3. The low prestressed self-resetting asymmetric friction damping shock absorbing device according to claim 1, characterized in that: A spring mounting groove (2311) is provided in the wedge block mounting groove (231), and a pressing end head (223) having a shape corresponding to the spring mounting groove (2311) is provided at the lower end of the lower wedge block (22); a preload spring (26) is provided in the spring mounting groove (2311), and the pressing end head (223) is located on the preload spring (26) and presses the preload spring (26).

4. A low prestressed self-resetting asymmetric friction damping shock absorbing device according to claim 3, characterized in that: There are multiple spring installation slots (2311), and there are multiple springs in each spring installation slot (2311).

5. The low prestressed self-resetting asymmetric friction damping shock absorbing device according to claim 1, characterized in that: The self-resetting unit (3) includes a reset spring (31) and a stopper (32); the asymmetric damping unit (2) also includes a transmission rod (27) and a cable connecting plate (28); One end of the transmission rod (27) is connected to the wedge sleeve (23), and the other end is connected to the cable connecting plate (28). The stopper (32) is fixed on the transmission rod (27). The return spring (31) is sleeved on the transmission rod (27). One end of the return spring (31) abuts against the stopper (32), and the other end abuts against the inner side of the open end of the outer cylinder (1). The cable connecting plate (28) is connected to an external device.

6. The low prestressed self-resetting asymmetric friction damping shock absorbing device according to claim 1, characterized in that: A first connecting plate (11) is provided on the outer side of the sealing end of the outer cylinder (1), and the outer cylinder (1) is connected to external equipment via the first connecting plate (11).

7. The low prestressed self-resetting asymmetric friction damping shock absorbing device according to claim 1, characterized in that: The outer cylinder (1) comprises a first cylinder (12) and a second cylinder (13) connected to each other, wherein the first cylinder (12) and the second cylinder (13) are coaxially fixed, the asymmetric damping unit (2) is located inside the first cylinder (12), and the self-resetting unit (3) is located inside the second cylinder (13).

8. The low prestressed self-resetting asymmetric friction damping shock absorbing device according to claim 7, characterized in that: The connecting ends of the first cylinder (12) and the second cylinder (13) are provided with corresponding fixed ends and bolts, and the fixed ends are connected by bolts.

Images