Self-resetting rotary friction type damper

Abstract

The utility model relates to a self-resetting rotary friction type damper, and belongs to the field of civil engineering structure damping. Axial displacement is converted into rotating motion of the rotor column through the ball screw mechanism, and friction energy consumption is achieved through a rotating friction pair of the rotor column and the fixed friction plate. And meanwhile, the annularly arranged SMA tows are subjected to tensile deformation when the screw rod displaces, secondary energy consumption is achieved through the hyperelastic hysteretic effect, and the screw rod is driven to reset after unloading. By combining a rotary friction and SMA superelasticity dual energy dissipation mechanism, the energy absorption efficiency and the anti-seismic property are remarkably improved; the self-resetting function is achieved through the hyperelastic effect of the SMA material, and residual deformation is eliminated; the modular design supports flexible adjustment of friction coefficients, strokes and reset force, and is suitable for manufacturing of large, medium and small dampers; and the ball screw and a standardized shell structure are convenient for batch production, and the maintenance cost is reduced. According to the scheme, an efficient, reliable and intelligent damping solution is provided for engineering structures such as bridges and buildings.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of civil engineering structure damping, and relates to a self-resetting rotary friction type damper. BACKGROUND

[0002] As a key damping device, the damper is widely used in the fields of buildings, bridges and mechanical equipment, and its core function is to absorb and dissipate vibration energy, thereby improving the seismic performance and stability of the structure. The traditional friction damper is favored for a long time due to its simple structure, low cost and other advantages, but with the increasing complexity of engineering requirements, its technical limitations gradually appear. First, the traditional friction damper usually adopts a linear friction form, and its stroke is limited by the physical size, which makes it difficult to meet the actual needs of large deformation or high energy input working conditions. In addition, the nonlinear relationship between its friction and speed complicates the tribology analysis, further limiting the design optimization and practical application.

[0003] More significantly, the traditional friction damper lacks self-resetting capability and usually relies on additional spring devices to achieve the resetting function. Such design not only increases the complexity and redundancy of the structure, but also may lead to insufficient resetting accuracy and reliability decline. For example, under extreme conditions such as earthquakes, the residual deformation of the structure after the earthquake makes the damper unable to return to the original position, directly affecting the subsequent damping efficiency. At the same time, the existing friction damper generally relies on a single friction energy dissipation mechanism, which is difficult to meet the energy absorption needs in high-frequency vibration or large amplitude scenarios, resulting in limited energy dissipation efficiency and comprehensive performance.

[0004] In recent years, the development of ball screw technology and shape memory alloy (SMA) materials has provided a new idea for damper design. Ball screw can efficiently convert linear motion into rotary motion, with high transmission efficiency and precise control characteristics; while SMA material has unique potential in self-resetting and energy dissipation fields due to its superelastic hysteresis effect and shape memory characteristics. However, the existing technology has not effectively combined the rotary friction advantages of ball screw and the composite energy dissipation mechanism of SMA material, resulting in significant defects in the stroke expansion, self-resetting function and multi-mode energy dissipation coordination of traditional dampers. SUMMARY

[0005] Therefore, the purpose of the utility model is to provide a self-resetting rotary friction type damper, which breaks through the bottleneck of existing dampers in engineering adaptability, resetting accuracy and comprehensive performance through structure optimization and multi-technology integration, to meet the dual needs of efficient damping and intelligent self-resetting in modern civil engineering.

[0006] To achieve the above purpose, the utility model provides the following technical scheme:

[0007] A self-resetting rotary friction type damper, comprising: a ball screw rod, one end of which is connected to a movable end connector; a ball screw nut, which is threadedly matched with the ball screw rod; a rotor column, which is fixedly connected to the ball screw nut and rotates synchronously therewith; a friction plate, which is fixed to a friction plate base, the friction plate base being fixed to a fixed end of a housing; a pre-tightening sleeve, which is sleeved outside the friction plate and is used for adjusting the contact pressure of a friction pair; an SMA wire bundle top pull head, which is fixed to the top end of the ball screw rod; an SMA wire bundle fixing frame, which is fixed to the friction plate base; and an SMA wire bundle, which is arranged in a ring shape and has two ends connected to the SMA wire bundle top pull head and the SMA wire bundle fixing frame respectively.

[0008] Optionally, the friction plate base is fixed to the fixed end of the housing by means of bolts.

[0009] Optionally, the ball screw nut and the housing are connected by means of thrust bearings to bear axial pressure and allow free rotation; wherein a first thrust bearing is arranged between the ball screw nut and the friction plate; a second thrust bearing is arranged between the ball screw nut and a movable end wall of the housing; and a rotating bearing is arranged between the ball screw nut and a side wall of the housing.

[0010] Optionally, the damper further comprises a housing, which comprises a fixed end cover plate and a movable end cover plate, and the fixed end cover plate is connected to the fixed end connector.

[0011] Optionally, the contact surface between the rotor column and the friction plate is an annular friction surface, and the material of the friction surface is a copper-based alloy or a ceramic composite material.

[0012] Optionally, the pre-tension of the SMA wire bundle is realized by adjusting the installation position of the SMA wire bundle top pull head.

[0013] Optionally, the inner wall of the cylindrical shell of the housing is provided with a guide groove for limiting the radial displacement of the rotor column.

[0014] Optionally, the movable end connector and the fixed end connector are respectively provided with flanges for bolt connection with a controlled structure.

[0015] The self-resetting rotary friction type damper has the following beneficial effects:

[0016] The self-resetting rotary friction type damper has the following beneficial effects:

[0017] Firstly, the scheme introduces a ball screw mechanism to upgrade the traditional linear friction mode to rotary friction energy dissipation, effectively breaking through the travel limit of traditional dampers. The precise fit of the ball screw screw and nut can efficiently convert the axial displacement of the controlled structure into rotary motion of the rotor column, greatly expanding the friction contact area and relative motion stroke through the annular friction pair between the rotor column and the fixed friction plate. Compared with the limited linear stroke of traditional linear friction dampers, the rotary friction form can achieve a longer friction path under the same axial displacement, thereby significantly improving the energy dissipation capacity of a single cycle. In addition, the high transmission efficiency and low wear characteristics of the ball screw further enhance the durability of the damper, especially suitable for extreme conditions such as earthquakes, strong winds, and large deformations with high energy input.

[0018] Secondly, the scheme creatively integrates shape memory alloy (SMA) wire bundles with the ball screw mechanism, realizing dual mechanisms of friction energy dissipation and super-elastic hysteresis energy dissipation. The SMA wire bundles are fixed in an annular arrangement between the friction plate base and the ball screw screw. When the screw reciprocates, the SMA wire bundles produce a super-elastic hysteresis effect through tensile deformation, forming a second energy dissipation path. This design not only significantly improves energy absorption efficiency through composite energy dissipation mechanisms, but also fully utilizes the super-elastic properties of SMA materials, giving the damper a self-resetting function. After the external load is removed, the SMA wire bundles are driven by the phase change restoring force to reset the ball screw screw to the initial position, eliminating the need for external springs or additional power devices, and solving the reset failure problem caused by residual deformation in traditional dampers. Most importantly, the SMA wire bundles remain in a tensile state under both tensile and compressive conditions, avoiding performance degradation caused by compression, greatly improving material utilization and system reliability.

[0019] Further, the scheme realizes flexible adjustment of damper parameters through modular design, enhancing engineering applicability. The introduction of the pre-tightening sleeve allows the adjustment of the contact pressure between the friction plate and the rotor column, precisely controlling the friction coefficient of the friction pair to match the energy dissipation requirements under different vibration intensities. At the same time, key parameters such as the thread pitch of the ball screw, the pre-tension of the SMA wire bundle, and the cross-sectional area can be customized and adjusted according to actual working conditions. For example, increasing the thread pitch can expand the working stroke of the damper, while increasing the pre-tension of the SMA wire bundle can strengthen the self-resetting driving force. This high adjustability allows the same structural design to adapt to the manufacturing needs of large, medium, and small dampers, significantly reducing the cost and cycle of customized development.

[0020] In addition, the structural design of the scheme takes into account the standardization of production and the convenience of maintenance. As a mature standardized mechanical transmission component, the ball screw has a perfect manufacturing process and quality control system, which is conducive to the batch production and quality stability of the damper. The shell adopts a split design, including a movable end cover plate and a fixed end cover plate, which facilitates the installation, maintenance and replacement of internal components. The thrust bearing provided between the rotor column and the friction plate not only reduces the rotational friction resistance, but also effectively prevents the rotor from tilting through radial constraint design, ensuring the stability of long-term operation. The movable end and the fixed end connector adopt a flange structure, which can be directly connected with the controlled structure by bolts, greatly simplifying the on-site installation process.

[0021] In summary, the scheme improves the energy dissipation efficiency, self-resetting accuracy, working condition adaptability and economy of the damper through the synergistic effect of rotational friction and SMA super-elastic energy dissipation, parameter-adjustable modular design and standardized manufacturing process, and provides an efficient, reliable and intelligent vibration reduction solution for bridge, high-rise building and other civil engineering structures.

[0022] The other advantages, objects and features of the present application will be explained in the following description, and to some extent, will be obvious to those skilled in the art based on the study of the following, or can be taught from the practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to make the objects, technical solutions and advantages of the present application more clear, the preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, in which:

[0024] Figure 1 is a sectional view of the present scheme;

[0025] Figure 2 is another perspective sectional view of the present scheme;

[0026] Figure 3 is an axonometric view of the present scheme;

[0027] Figure 4 is Figure 3 is an axonometric view without the shell;

[0028] Figure 5 is Figure 4 is an axonometric view without the friction plate base;

[0029] Figure 6 is Figure 5 is an axonometric view without the friction plate;

[0030] Figure 7 is Figure 6 is an axonometric view without the rotor column;

[0031] Figure 8 For Figure 7 Axonometric view of the friction plate base.

[0032] Reference numerals: 1 ball screw rod, 2 ball screw nut, 3 rotor column, 4 friction plate, 5 pre-tightening sleeve, 6 SMA filament top pull head, 7 SMA filament fixing frame, 8 SMA filament, 9 rotating bearing, 10 first thrust bearing, 11 second thrust bearing, 12 friction plate base, 13 housing, 14 movable end connecting piece, 15 fixed end connecting piece. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail with specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure. The present application can also be implemented or applied in other different embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application. It should be noted that the drawings provided in the following examples only schematically illustrate the basic concept of the present application, and the features in the following examples and embodiments can be combined with each other without conflict.

[0034] Wherein, the drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the present application; in order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation of the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] Please refer to Figures 1-8The core structure of the self-centering rotary friction damper includes an outer shell 13, which is composed of a cylindrical shell, a movable end cover plate and a fixed end cover plate. The fixed end cover plate of the outer shell 13 is connected to the fixed end connector 15 through a bolt, which is used to connect with the fixed part of the controlled structure; the movable end cover plate is fixed with the movable end connector 14, which is connected with the movable part of the controlled structure through a flange plate and a bolt. A ball screw rod 1 is arranged axially inside the outer shell 13, which extends to the movable end connector 14 at one end, and is used to transmit the axial displacement of the controlled structure. The ball screw rod 1 and the ball screw nut 2 are matched through a precise thread, which converts the axial linear motion of the screw rod into the rotary motion of the nut. The ball screw nut 2 is fixed to the lower end of the rotor column 3 through a key, so that the rotor column 3 rotates synchronously with the nut.

[0037] The rotor column 3 is a rotary component of the damper, and its outer surface forms an annular rotary friction pair with the fixed friction plate 4. The friction plate 4 is fixed to the fixed end of the outer shell 13 through the friction plate base 12, which is connected with the fixed end cover plate of the outer shell 13 through a high-strength bolt to ensure the rigidity of the overall structure. The friction plate base 12 is provided with an annular groove for accurately installing the friction plate 4, and a pre-tightening sleeve 5 is sleeved outside the friction plate 4. The pre-tightening sleeve 5 adopts a screw adjustment structure, which changes the contact pressure between the friction plate 4 and the rotor column 3 by tightening or loosening, so as to accurately control the friction coefficient. The upper end of the rotor column 3 is connected with the fixed end cover plate of the outer shell 13 through a rotating bearing 9, which allows the rotor column 3 to rotate freely while restricting its radial displacement to avoid deflection. The ball screw nut 2 and the outer shell 13 are connected through a thrust bearing to bear the axial pressure and allow free rotation; wherein the first thrust bearing 10 is arranged between the ball screw nut 2 and the friction plate 4; the second thrust bearing 11 is arranged between the ball screw nut 2 and the movable end wall of the outer shell 13; the rotating bearing 9 is arranged between the ball screw nut 2 and the side wall of the outer shell 4.

[0038] The SMA wire bundle 8 is integrated in the damper in an annular arrangement. The SMA wire bundle fixing frame 7 is fixed to the friction plate base 12 through a bolt, and one end of the SMA wire bundle 8 is fixed in the annular groove of the SMA wire bundle fixing frame 7; the other end of the SMA wire bundle 8 is connected to the SMA wire bundle top pull head 6, which is fixed to the top end of the ball screw rod 1 through a threaded structure. When the ball screw rod 1 is axially displaced under the action of external load, the top pull head 6 moves synchronously with the screw rod, causing the SMA wire bundle 8 to stretch and deform. The super-elastic hysteresis effect of the SMA wire bundle 8 dissipates energy in this process, and its super-elasticity drives the screw rod to reset after unloading. The pre-tension of the SMA wire bundle 8 can be set by adjusting the installation position of the top pull head 6 to adapt to different reset force requirements.

[0039] The cylindrical shell inner wall of the shell 13 is provided with a guide groove for limiting the radial displacement of the rotor column 3 and ensuring the concentricity of the rotating friction pair. The flange design of the movable end connecting piece 14 and the fixed end connecting piece 15 simplifies the installation process with the external structure, and the bolt holes are distributed at standard intervals, facilitating quick docking. The friction plate base 12 is made of high-rigidity alloy material, and its connection with the fixed end of the shell 13 adopts double-row bolt fastening to ensure that it does not loosen under long-term vibration load. The annular groove of the base 12 is embedded with wear-resistant gaskets for reducing the installation error of the friction plate 4 and achieving initial gap calibration of the friction pair by adjusting the gasket thickness. In addition, the connection between the friction plate base 12 and the SMA wire bundle fixing bracket 7 adopts a detachable design, facilitating the replacement or maintenance of the SMA wire bundle 8 in the later stage.

[0040] In this scheme, the damper can be assembled according to the following steps:

[0041] Pass the ball screw rod 1 through the movable end connecting piece 14 and pre-assemble it with the ball screw nut 2; fix the rotor column 3 to the ball screw nut 2 and install the first thrust bearing 10 and the second thrust bearing 11; embed the friction plate 4 into the groove of the friction plate base 12, set the pre-tightening sleeve 5 and adjust it to the initial pre-tightening force; fix the two ends of the SMA wire bundle 8 to the SMA wire bundle fixing bracket 7 and the top pull head 6 respectively, and apply a preset pre-tension; assemble the fixed end cover plate of the shell 13 with the friction plate base 12 and the fixed end connecting piece 15, and finally package the movable end cover plate.

[0042] In this scheme, the operation control method of the damper is as follows:

[0043] When the controlled structure undergoes axial displacement, the ball screw rod 1 drives the nut 2 and the rotor column 3 to rotate, and energy is consumed through the rotating friction pair of the friction plate 4 and the rotor column 3; at the same time, the SMA wire bundle 8 is stretched due to the displacement of the screw rod, and secondary energy is consumed through the super-elastic hysteresis effect; after the external load is eliminated, the shape restoring force of the SMA wire bundle 8 drives the screw rod 1 to move in the opposite direction, bringing the rotor column 3 back to its original position; by periodically detecting the tightness of the pre-tightening sleeve 5 and the pre-tension of the SMA wire bundle 8, the energy consumption and reset performance of the damper can be adjusted.

[0044] In this scheme, the maintenance and debugging of the damper can be carried out according to the following method:

[0045] Periodically disassemble the movable end cover plate of the shell 13 to check the wear of the thrust bearings 10 and 11 and supplement the lubricating grease; adjust the friction pair pressure by rotating the pre-tightening sleeve 5, and if the friction plate 4 is severely worn, replace the wear-resistant gasket in the groove; adjust the threaded position of the top pull head 6 to reset the pre-tension of the SMA wire bundle 8, ensuring the stability of the self-resetting function.

[0046] The high-efficiency transmission of the ball screw, the multi-path energy consumption of the rotary friction, the intelligent self-resetting characteristics of the SMA material are organically combined through the above-mentioned structural and method design, and meanwhile, the wide adaptability of the damper performance is realized with the aid of the modular adjusting components (such as the pre-tightening sleeve hoop 5 and the SMA wire bundle pre-tension adjusting), and the damper is suitable for the vibration reduction requirements in the fields of bridges, buildings and the like.

[0047] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A self-centering rotational friction-type damper, characterized by, The utility model relates to a kind of friction drive mechanism, including: Ball screw rod (1), one end is connected with movable end connecting piece (14); Ball screw nut (2) is screwed with the ball screw rod (1); Rotor column (3) is fixedly connected to the ball screw nut (2), and rotates synchronously with it; Friction plate (4) is fixed in friction plate base (12), and the friction plate base (12) is fixed in the fixed end of shell (13); Pre-tightening sleeve (5) is sleeved outside the friction plate (4), for adjusting the contact pressure of friction pair; SMA filament top puller (6) is fixed in the top end of the ball screw rod (1); SMA filament fixing frame (7) is fixed in the friction plate base (12); SMA filament (8) is annularly arranged, and two ends are connected with the SMA filament top puller (6) and the SMA filament fixing frame (7) respectively.

2. The self-centering rotational friction-type damper according to claim 1, characterized in that, The friction plate base (12) is fixed in the fixed end of shell (13) by bolt.

3. The self-centering rotational friction-type damper according to claim 1, wherein The ball screw nut (2) and shell (13) are connected by thrust bearing to bear axial pressure and allow free rotation;Wherein, first thrust bearing (10) is arranged between ball screw nut (2) and friction plate (4);Second thrust bearing (11) is arranged between ball screw nut (2) and movable end wall of shell (13);Rotary bearing (9) is arranged between ball screw nut (2) and side wall of shell (13).

4. The self-centering rotational friction-type damper according to claim 1, wherein It also includes shell (13), including fixed end cover plate and movable end cover plate, and the fixed end cover plate is connected with fixed end connecting piece (15).

5. The self-centering rotational friction-type damper according to claim 1, wherein The contact surface of the rotor column (3) and the friction plate (4) is an annular friction surface, and the friction surface material is copper-based alloy or ceramic composite material.

6. The self-centering rotational friction-type damper according to claim 1, wherein The pre-tension of the SMA filament (8) is realized by adjusting the installation position of the SMA filament top puller (6).

7. The self-centering rotational friction-type damper according to claim 1, wherein The cylindrical shell inner wall of the shell (13) is provided with a guide groove for limiting the radial displacement of the rotor column (3).

8. The self-centering rotational friction-type damper according to claim 1, wherein The movable end connecting piece (14) and the fixed end connecting piece (15) are respectively provided with flanges for bolt connection with the controlled structure.

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