Impact resistant damper

Abstract

The application provides an impact-resistant damper. The impact-resistant damper comprises an eddy current damping unit and a buffer damping unit. The eddy current damping unit comprises a ball screw drivingly connected with a controlled structure and a fixed outer sleeve arranged outside the ball screw. The buffer damping unit comprises a resilient stiffness member arranged close to a driving connection end of the ball screw. One end of the resilient stiffness member is sleeved outside a screw rod of the ball screw, and the other end of the resilient stiffness member is connected with the outer sleeve. When the controlled structure reaches a preset displacement value or a preset impact value, one end of the resilient stiffness member is deformed to start the buffer damping unit. The application has the advantages of guaranteeing the vibration reduction and impact resistance effect of the controlled structure under large displacement and impact, compact structure and the like.

Description

Technical Field

[0001] This invention relates to the field of structural vibration reduction, and more particularly to an impact damper. Background Technology

[0002] Eddy current dampers are commonly used in seismic resistance and vibration reduction applications such as long-span bridge structures and large building frameworks. Existing eddy current dampers consist of an energy-dissipating magnet and a conductor cylinder. When the conductor cylinder is placed in a changing magnetic field or moves within a magnetic field cutting magnetic lines of force, an induced current is generated inside the conductor cylinder, which in turn generates heat energy. In other words, the eddy current damper converts kinetic energy into electrical energy and then into heat energy through the eddy current effect, thereby producing a damping effect and achieving the purpose of seismic resistance and vibration reduction.

[0003] However, existing eddy current dampers, as a type of velocity damper, are limited by the size and specifications of the damper itself, resulting in a limited range of damping components that can be added. This means that in some extreme conditions, when additional damping force is required to achieve a wider vibration reduction range and reduce the impact on the equipment, existing eddy current dampers cannot meet the needs. Consequently, the vibration reduction effect and safety reliability of structures such as long-span bridges and large building structures are poor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an impact damper that ensures the vibration reduction and impact resistance effect of the controlled structure under large displacement and impact, and has a compact structure.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0006] An impact damper includes an eddy current damping unit and a buffer damping unit. The eddy current damping unit includes a ball screw driven and connected to a controlled structure, and a fixed outer sleeve. The outer sleeve is located outside the ball screw. The buffer damping unit includes an elastic stiffness member located near the drive connection end of the ball screw. One end of the elastic stiffness member is sleeved outside the lead screw of the ball screw, and the other end is connected to the outer sleeve. When the controlled structure reaches a preset displacement value or a preset impact value, one end of the elastic stiffness member deforms and activates the buffer damping unit.

[0007] As a further improvement to the above technical solution:

[0008] One end of the elastic stiffness member is movably sleeved outside the lead screw of the ball screw, and the other end is fixedly connected to the outer sleeve; the lead screw is provided with an energy-dissipating limiting part that limits the moving end of the elastic stiffness member, and the initial distance between the energy-dissipating limiting part and the moving end of the elastic stiffness member is the initial action distance for activating the buffer damping unit.

[0009] The energy-consuming limiting part includes a compression limiting part, which is located outside the elastic stiffness member and close to the drive connection end of the lead screw. The initial action distance is the compression action distance between the compression limiting part and the elastic stiffness member.

[0010] When the displacement of the controlled structure is less than or equal to the initial action distance, the output force of the impact damper is the eddy current damping force of the eddy current damping unit.

[0011] When the controlled structure moves toward the elastic stiffness member, and the displacement of the controlled structure is greater than the compression distance, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit, the deformation damping force generated by the buffer damping unit, and the anti-deformation elastic force.

[0012] When the controlled structure moves away from the elastic stiffness member and the displacement of the controlled structure is greater than the compression distance, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit and the anti-deformation elastic force generated by the buffer damping unit.

[0013] The energy-consuming limiting part further includes a tension limiting part, which is located inside the elastic stiffness member, and the initial action distance is the tension action distance between the tension limiting part and the elastic stiffness member.

[0014] When the controlled structure moves away from the elastic stiffness member and the displacement of the controlled structure is greater than the tension spacing, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit, the deformation damping force generated by the buffer damping unit, and the anti-deformation elastic force.

[0015] When the controlled structure moves toward the elastic stiffness member, and the displacement of the controlled structure is greater than the tensile action distance, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit and the anti-deformation elastic force generated by the buffer damping unit.

[0016] The output force of the impact damper, the damping force of the eddy current damping unit, and the damping force of the buffer damping unit satisfy the following relationship:

[0017]

[0018] in, To withstand the output force of the impact damper, is the damping coefficient of the eddy current damping element. For the deformation damping coefficient of the elastic stiffness component, The displacement of the controlled structure. For the speed of the controlled structure, The initial working distance between the energy-dissipating limiting part and the elastic stiffening part. This is the stiffness coefficient of an elastic stiffness component.

[0019] One end of the elastic stiffness member is fixedly connected to the lead screw, and the other end is connected to the outer sleeve through a sliding anti-impact unit. The sliding anti-impact unit includes a guide rail assembly and a non-Newtonian fluid. The guide rail assembly is located axially in the outer sleeve. The non-Newtonian fluid is located inside the guide rail assembly. When the damper is not impacted, the non-Newtonian fluid is in a liquid state. The elastic stiffness member moves through the guide rail assembly without deformation. When the damper is impacted, the non-Newtonian fluid hardens under stress. The guide rail pairs of the guide rail assembly are relatively stationary. The elastic stiffness member deforms under the action of the lead screw, activating the buffer damping unit.

[0020] The guide rail assembly includes a sliding connecting block that drives the fluid cavity, and a guide rail installed on the outer sleeve. The elastic stiffness member is connected to the sliding connecting block. The guide rail is provided with a limiting flow passage located in the middle of the fluid cavity. The limiting flow passage is provided with a flow passage hole. The non-Newtonian fluid is disposed in the fluid cavity and the flow passage hole.

[0021] The eddy current damping unit further includes an energy dissipation component, which includes an energy dissipation magnet and a conductor cylinder. The ball screw nut is axially limited, and the ball screw nut is connected to a magnet mounting bracket via a torque transmission key. The energy dissipation magnets are arranged in an array on the magnet mounting bracket. The conductor cylinder is arranged opposite to the energy dissipation magnets and is installed on the outer sleeve.

[0022] A bearing component is provided between the lead screw nut and the magnet mounting bracket and the outer sleeve to ensure stable rotation of the lead screw nut and the magnet mounting bracket. The bearing component includes roller bearings provided on the lead screw nut and the magnet mounting bracket. The lead screw nut of the ball screw is axially limited by a limiting end cap. The limiting end cap is provided at both ends of the outer sleeve and presses the roller bearing.

[0023] The ball screw is provided with an anti-rotation nut at one end inside the outer sleeve to prevent it from unscrewing when the ball screw moves axially. The anti-rotation nut engages with the ball screw nut for limiting the movement when the screw is stretched a certain distance.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] The impact damper of this invention includes an eddy current damping unit and a buffer damping unit. The eddy current damping unit comprises a ball screw and an outer sleeve. The ball screw is driven and connected to the controlled structure, and the outer sleeve is located outside the ball screw and fixedly installed. The eddy current damping unit generates eddy current damping through axial movement of the screw when the controlled structure vibrates, achieving vibration reduction and energy dissipation during small vibration displacements of the controlled structure. Its overall layout is compact, and the buffer damping unit can be installed in parallel on the existing damper structure, without increasing the installation space of the damper.

[0026] Meanwhile, this invention cleverly integrates a buffer damping unit into the stroke of the eddy current damping unit through a structural design, combining a velocity-type damper and a displacement-type damper to form a multi-segment damping force. Specifically, an elastic stiffness element is placed near the ball screw drive connection end of the lead screw. One end of the elastic stiffness element is fitted onto the outside of the ball screw, and the other end is connected to an outer sleeve. One end of the elastic stiffness element deforms when the controlled structure reaches a preset displacement or impact value, thus activating the buffer damping unit. At this time, the eddy current damping unit provides nonlinear damping, and both the eddy current damping unit and the buffer damping unit simultaneously provide damping, significantly absorbing the energy from large displacement impacts and ensuring effective vibration reduction of the controlled structure under extreme conditions. Furthermore, the elastic stiffness element provides both damping and damper stiffness, thereby buffering the impact load and giving the damper excellent impact resistance.

[0027] It is evident that the multi-segment damping force formed by the combination of the eddy current damping unit and the buffer damping unit of this invention enables the controlled structure to have excellent vibration reduction and impact resistance under large displacement and impact, and effectively solves the problem that the damper components themselves are easily damaged under large displacement and rapid impact, greatly improving the safety of controlled structures such as long-span bridge structures and large building structures, and the structure is compact and low in cost. Attached Figure Description

[0028] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the impact damper of Embodiment 1 of the present invention;

[0030] Figure 2 yes Figure 1 A sectional view of section AA;

[0031] Figure 3 This is a schematic diagram of the impact damper of Embodiment 1 of the present invention;

[0032] Figure 4 yes Figure 1 A sectional view of section BB;

[0033] Figure 5 This is a three-dimensional structural schematic diagram of the impact damper of Embodiment 2 of the present invention;

[0034] Figure 6 This is a front view of the impact damper of Embodiment 2 of the present invention;

[0035] Figure 7 yes Figure 6 A sectional view of the CC section;

[0036] Figure 8 This is a three-dimensional structural schematic diagram of the sliding impact-resistant unit of the present invention;

[0037] Figure 9 This is a front view of the sliding impact-resistant unit of the present invention;

[0038] Figure 10 yes Figure 9 A sectional view of the DD section;

[0039] Figure 11 yes Figure 9 A sectional view of the EE section.

[0040] The labels in the diagram represent:

[0041] 1. Eddy current damping unit; 11. Ball screw; 111. Screw; 1111. Outer tube of screw joint; 112. Screw nut; 12. Outer sleeve; 121. Sleeve body; 122. Inner sleeve end tube; 1221. Outer tube of sleeve joint; 1222. Extension tube; 13. Energy dissipating magnet; 14. Conductor cylinder; 15. Torque transmission key; 16. Magnet mounting bracket; 17. Bearing components; 171. Deep groove ball bearing; 172. Roller bearing; 173. Shaft elastic retaining ring; 18. Anti-rotation nut; 2. Buffer damping unit; 21. Elastic stiffness component ; 211. Wire rope; 22. Energy-consuming limiting part; 221. Compression limiting part; 222. Tension limiting part; 23. Initial action distance; 231. Compression action distance; 232. Tension action distance; 24. Annular fixed end cap; 25. Annular movable end cap; 3. Sliding impact-resistant unit; 31. Guide rail assembly; 311. Sliding connecting block; 3111. Fluid cavity; 3112. Wire rope connecting hole; 312. Guide rail; 313. Limiting flow passage part; 314. Flow passage hole; 32. Non-Newtonian fluid; 33. Liquid injection plug; 34. Seal. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection of the present invention.

[0043] Example 1

[0044] like Figures 1 to 4As shown, the impact damper of this embodiment includes an eddy current damping unit 1 and a buffer damping unit 2. The eddy current damping unit 1 includes a ball screw 11 and an outer sleeve 12. The ball screw 11 is driven and connected to the controlled structure; the outer sleeve 12 is located outside the ball screw 11 and is fixedly installed. The buffer damping unit 2 includes an elastic stiffness member 21, which is located near the drive connection end of the ball screw 11. One end of the elastic stiffness member 21 is sleeved outside the lead screw 111 of the ball screw 11, and the other end is connected to the outer sleeve 12. One end of the elastic stiffness member 21 deforms when the controlled structure reaches a preset displacement value or a preset impact value, thereby activating the buffer damping unit 2. The eddy current damping unit 1 can generate eddy current damping by axially moving the lead screw 111 when the controlled structure vibrates, achieving vibration reduction and energy dissipation during small vibrations of the controlled structure. Its overall layout is compact, and the buffer damping unit 2 can be installed in parallel on the basis of the existing damper structure, without increasing the installation space of the damper.

[0045] Meanwhile, this invention cleverly integrates the buffer damping unit 2 into the stroke of the eddy current damping unit 1 through a structural design, combining a velocity-type damper and a displacement-type damper to form a multi-segment damping force. Specifically, an elastic stiffness element 21 is installed near the drive connection end of the ball screw 111. One end of the elastic stiffness element 21 is sleeved outside the ball screw 111, and the other end is connected to the outer sleeve 12. One end of the elastic stiffness element 21 deforms when the controlled structure reaches a preset displacement or impact value, thereby activating the buffer damping unit 2. At this time, the eddy current damping unit 1 provides nonlinear damping, and both the eddy current damping unit 1 and the buffer damping unit 2 simultaneously provide damping, significantly absorbing the energy from large displacement impacts and ensuring effective vibration reduction of the controlled structure under extreme conditions. Furthermore, the elastic stiffness element 21 provides damping while simultaneously providing damping, thus buffering the impact load and giving the damper excellent impact resistance.

[0046] It can be seen that the multi-segment damping force formed by the combination of the eddy current damping unit 1 and the buffer damping unit 2 of the present invention enables the controlled structure to have excellent vibration reduction and impact resistance under large displacement and impact, and effectively solves the problem that the damper components themselves are easily damaged under large displacement and rapid impact, greatly improving the safety of controlled structures such as long-span bridge structures and large building structures, and the structure is compact and low in cost.

[0047] like Figures 1 to 3As shown, one end of the elastic stiffness member 21 is fixedly connected to the outer sleeve 12, and the other end of the elastic stiffness member 21 is movably sleeved on the outside of the lead screw 111 of the ball screw 11. The lead screw 111 is provided with an energy dissipation limiting part 22. The initial distance between the energy dissipation limiting part 22 and the moving end of the elastic stiffness member 21 is the initial action distance 23 for activating the buffer damping unit 2. When the controlled structure experiences large displacement vibration and the initial action distance 23 is zero, the energy dissipation limiting part 22 and the moving end of the elastic stiffness member 21 are limited. This invention allows the upper end of the elastic stiffness member 21 to slide freely, so as to provide damping of the buffer damping unit 2 under the action of the energy dissipation limiting part 22.

[0048] By setting an energy-dissipating limiting part 22 on the lead screw 111 and setting an initial action distance 23 between the energy-dissipating limiting part 22 and the elastic stiffness member 21, the opening of the buffer damping unit 2 can be controlled by adjusting the initial action distance 23. When the initial action distance 23 is reduced to zero during a large displacement impact on the controlled structure, the energy-dissipating limiting part 22 contacts the moving end of the elastic stiffness member 21 and is axially limited. The elastic stiffness member 21 undergoes tensile and compressive deformation, activating the buffer damping unit 2. The eddy current damping unit 1 provides nonlinear damping. The eddy current damping unit 1 and the buffer damping unit 2 provide damping simultaneously to absorb the energy brought by the large displacement impact, ensuring effective vibration reduction of the controlled structure under extreme working conditions, and giving the damper excellent impact resistance.

[0049] like Figure 2 As shown, the energy-consuming limiting part 22 further includes a compression limiting part 221. The compression limiting part 221 is located outside the elastic stiffness member 21 and close to the drive connection end of the lead screw 111, and the initial action distance 23 is the compression action distance 231 between the compression limiting part 221 and the elastic stiffness member 21.

[0050] When the controlled structure moves toward the elastic stiffness member 21, the velocity of the controlled structure is negative, and the displacement of the controlled structure is less than or equal to the compression action distance 231, the output force of the impact damper is the eddy current damping force of the eddy current damping unit 1.

[0051] When the controlled structure moves toward the elastic stiffness member 21, the velocity of the controlled structure is negative, and the displacement of the controlled structure is greater than the compression action distance 231, at this time, the compression limiting part 221 contacts the moving end of the elastic stiffness member 21 and is axially limited, and the elastic stiffness member 21 generates compression deformation. At this time, the elastic stiffness member 21 provides friction damping force and elastic restoring force. The output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit 1, the deformation damping force generated by the buffer damping unit 2, and the anti-deformation elastic force.

[0052] When the controlled structure moves away from the elastic stiffness member 21, the velocity of the controlled structure is positive, and the displacement of the controlled structure is greater than the compression distance 231, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit 1 and the anti-deformation elastic force generated by the buffer damping unit 2.

[0053] Furthermore, the energy-dissipating limiting part 22 also includes a tension limiting part 222, which is located inside the elastic stiffness member 21. The initial action distance 23 is the tension action distance 232 between the tension limiting part 222 and the elastic stiffness member 21. At this time, when the controlled structure moves away from the elastic stiffness member 21, the velocity of the controlled structure is positive, and the displacement of the controlled structure is greater than the tension action distance 232, the tension limiting part 222 contacts the moving end of the elastic stiffness member 21 and is axially limited. The elastic stiffness member 21 undergoes tensile deformation. At this time, the elastic stiffness member 21 provides frictional damping force and elastic restoring force. The output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit 1, the deformation damping force generated by the buffer damping unit 2, and the anti-deformation elastic force. When the controlled structure moves toward the elastic stiffness member 21, and the displacement of the controlled structure is greater than the tensile action distance 232, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit 1 and the anti-deformation elastic force generated by the buffer damping unit 2.

[0054] This allows the damper to provide excellent buffering and vibration reduction even when the controlled structure is stretched beyond the tension spacing of 232.

[0055] As can be seen, when the controlled structure experiences a small displacement impact, the present invention utilizes the eddy current damping unit 1 combined with the ball screw 11 as a transmission component to convert the axial vibration of the controlled structure into accelerated rotational motion, and dissipates the energy through the eddy current damping unit 1. Simultaneously, when the vibration displacement of the controlled structure exceeds a certain range, an additional damping force provided by the buffer damping unit 2 is added to the original eddy current damping force to further absorb the energy generated by large displacement impacts, and to a large extent avoids damage to the damper itself from the impact.

[0056] Furthermore, such as Figure 3 As shown, the damper of the present invention is a buffer damping unit 2 ( , ) and eddy current damping unit 1 ( Parallel structure of ). Figure 3 ① in the figure represents the moving end of the elastic stiffness member 21, corresponding to Figure 2 The annular movable end cap 25 is in the middle; ② is the fixed end of the damper, corresponding to Figure 2 The inner end tube 122 of the outer sleeve 12, ③ is the moving end of the damper, corresponding to Figure 2 The tension limiting part 222, ④ is the moving end of the damper, corresponding to Figure 2Compression limiting part 221. Here is the damping coefficient of eddy current damping element 1. The deformation damping coefficient of the elastic stiffness component 21 is given. The stiffness coefficient of the elastic stiffness component 21 is... The displacement of the controlled structure can represent the displacement of the compression limiting part 221 or the tension limiting part 222 under the action of the controlled structure. This indicates the displacement of the inner sleeve end tube 122. In actual use, the inner sleeve end tube 122 is generally fixed to the foundation of the controlled structure. The displacement of the controlled structure due to deformation under force is negligible, that is... =0; The initial action distance 23 between the energy dissipation limiting part 22 and the elastic stiffness member 21, wherein the energy dissipation limiting part 222 includes a compression limiting part 221 and a tension limiting part 222; the initial action distance 23 includes a tension action distance 232 between the tension limiting part 222 and the annular movable end cap 25, and a compression action distance 231 between the compression limiting part 221 and the annular movable end cap 25. At this time, the output force of the impact damper, the damping force of the eddy current damping unit 1, and the damping force of the buffer damping unit 2 satisfy the following relationship:

[0057] (1)

[0058] in, To withstand the output force of the impact damper, Here is the damping coefficient of eddy current damping element 1. The deformation damping coefficient of the elastic stiffness component 21 is given. The displacement of the controlled structure. For the speed of the controlled structure, The initial working distance 23 between the energy-dissipating limiting part 22 and the elastic stiffness member 21. is the stiffness coefficient of the elastic stiffness component 21.

[0059] From the relation in equation (1), it can be clearly obtained that:

[0060] When the controlled structure moves away from the elastic stiffness member 21, the velocity of the controlled structure is positive, and the displacement of the controlled structure is greater than the tension action distance 232, that is, when the tension limiting part 222 contacts and triggers the annular movable end cap 25, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit 1, the deformation damping force generated by the buffer damping unit 2, and the anti-deformation elastic force. Simultaneously, when the tension limiting part 222 and the annular movable end cap 25 are still in contact triggering state, and the controlled structure moves towards the elastic stiffness member 21 with a negative velocity, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit 1 and the anti-deformation elastic force generated by the buffer damping unit 2.

[0061] When the displacement of the controlled structure is less than the initial action distance 23 between the limiting part and the elastic stiffness member 21, the output force of the impact damper is the eddy current damping force of the eddy current damping unit 1.

[0062] When the controlled structure moves toward the elastic stiffness member 21, the controlled structure has a negative velocity, and the displacement of the controlled structure is greater than the compression action distance 231, that is, when the compression limiting part 221 contacts and triggers the annular movable end cap 25, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit 1, the deformation damping force generated by the buffer damping unit 2, and the anti-deformation elastic force. Simultaneously, when the compression limiting part 221 and the annular movable end cap 25 are still in contact triggering state, and the controlled structure moves away from the elastic stiffness member 21 with a positive velocity, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit 1 and the anti-deformation elastic force generated by the buffer damping unit 2.

[0063] As can be seen from equation (1) above, the eddy current damping unit 1 participates in the entire working process of the damper, while the buffer damping unit 2 needs to contact ① and ③, or ① and ④ before it can participate in the working process. Moreover, during the return process, the internal damping of the elastic stiffness component 21 does not produce a reaction force on the controlled structure. The output force of the impact damper can be obtained quickly and accurately through the formula. Furthermore, the specific configuration of the impact damper components can also be obtained by setting the output force of the impact damper in advance, such as the specific configuration of parameters such as the compression action distance 231, the tension action distance 232, and the stiffness coefficient of the elastic stiffness component 21.

[0064] Preferably, the compression limiting part 221 is an upper limiting ring, and the tension limiting part 222 is a lower limiting ring. Both the upper and lower limiting rings are threadedly connected to the lead screw 111 of the ball screw 11. The compression action distance 231 is the initial distance from the lower surface of the upper limiting ring to the upper surface of the moving end of the elastic stiffness member 21, and the tension action distance 232 is the initial distance from the upper surface of the lower limiting ring to the lower surface of the moving end of the elastic stiffness member 21. This allows the axial position of the energy dissipation limiting part 22 on the lead screw 111 to be adjustable, thereby adjusting the action distance to meet the vibration reduction requirements of different controlled structures and different vibration conditions, and it is also easy to disassemble and replace.

[0065] In this embodiment, the elastic stiffness element 21 includes multiple steel wire ropes 211 arranged along the outer periphery of the lead screw. One end of each steel wire rope 211 is connected to the outer sleeve 12 through an annular fixed end cap 24, and the other end of the steel wire rope 211 is axially movable and sleeved on the lead screw 111 through an annular movable end cap 25. This allows one end of the steel wire rope 211 to slide freely relative to the lead screw under the action of the energy-dissipating limiting part 22, thereby compressing or stretching the steel wire rope 211, generating deformation damping force and anti-deformation elastic force, and activating the buffer damping unit 2. The present invention adjusts the stiffness of the damper by adjusting the length of the steel wire rope 211. For example, increasing the length of the steel wire rope 211 can decrease the stiffness of the damper; conversely, decreasing the length increases the stiffness of the damper. In other embodiments, the elastic stiffness element 21 can also be a helical compression spring or other types of springs, but the steel wire rope 211 has a better vibration reduction and energy dissipation effect than the spring because it consumes more additional energy during deformation (generating frictional damping force).

[0066] In this embodiment, the fixed end of the elastic stiffness member 21 is welded to the annular fixed end cap 24, and the movable end of the elastic stiffness member 21 is threaded to the annular movable end cap 25 to facilitate adjustment of the length of the elastic stiffness member 21.

[0067] like Figure 2 and Figure 4 As shown, the eddy current damping unit 1 also includes an energy-dissipating component, which includes an energy-dissipating magnet 13 and a conductor cylinder 14. The ball screw nut 112 is axially limited, and the energy-dissipating magnet 13 and conductor cylinder 14 are arranged opposite to each other and respectively disposed on the ball screw nut 112 and outer sleeve 12 of the ball screw 11. When the controlled structure vibrates, the ball screw nut 112 rotates, and the energy-dissipating magnet 13 disposed on the ball screw nut 112 moves relative to the conductor cylinder 14. At this time, the magnetic field lines generated by the cutting are converted into kinetic energy, which is dissipated through natural heat dissipation. In this embodiment, the conductor cylinder 14 is an aluminum conductor cylinder.

[0068] Furthermore, the lead screw nut 112 is connected to the magnet mounting bracket 16 via the torque transmission key 15. The energy-dissipating magnets 13 are arranged in an array on the magnet mounting bracket 16, making the energy-dissipating magnets 13 compact and effective. A bearing component 17 is provided between the lead screw nut 112, the magnet mounting bracket 16, and the outer sleeve 12 to ensure stable rotation of the lead screw nut 112 and the magnet mounting bracket 16, guaranteeing the stable and reliable operation of the damper. In this embodiment, the energy-dissipating magnets 13 and the magnet mounting bracket 16 are detachably connected by fasteners, and the torque transmission key 15 is a stepped key.

[0069] The reciprocating rotation of the lead screw nut 112 in this invention drives the synchronous reciprocating rotation of the magnet mounting bracket 16 through the torque transmission action of the torque transmission key 15. The energy-dissipating magnet 13 mounted on the magnet mounting bracket 16 reciprocates within the outer sleeve 12, generating electromagnetic induction and producing eddy currents within the conductor cylinder 14. Mechanical energy is converted into electrical energy, and then into heat energy dissipation. Under the same number of magnets and equal air gap (the distance between the energy-dissipating magnet 13 and the conductor cylinder 14), the transmission ratio of the ball screw 11 directly affects the damping coefficient of the eddy current damper.

[0070] Preferably, the outer sleeve 12 is provided with limiting end caps at both ends. The bearing component 17 includes a roller bearing 172 disposed on the lead screw nut 112 and the magnet mounting bracket 16. The roller bearing 172 is interference-fitted with the lead screw nut 112 and the magnet mounting bracket 16. The lead screw nut 112 of the ball screw 11 is axially limited by the limiting end cap. The limiting end cap is threadedly connected to the outer sleeve 12 and presses the roller bearing 172. Due to the axial limiting effect of the limiting end cap, the lead screw nut 112 cannot move up and down with the lead screw 111. With the help of the special mechanical structure of the ball screw 11, the reciprocating linear motion of the lead screw 111 will drive the lead screw nut 112 to perform reciprocating rotational motion. The lead screw 111 with different leads will cause the lead screw nut 112 to rotate at different speeds (and different transmission ratios) under the same lead screw linear speed.

[0071] Furthermore, the bearing component 17 also includes a deep groove ball bearing 171, which is disposed outside the magnet mounting bracket 16 and limited by a shaft elastic retaining ring 173 to provide radial support for the magnet mounting bracket 16, thereby ensuring stable rotation of the magnet mounting bracket 16. In this embodiment, a sealing ring is provided between the limiting end cap and the outer sleeve 12 to ensure the sealing performance of the damper.

[0072] Preferably, the end of the ball screw 11 located inside the outer sleeve 12 is provided with an anti-rotation nut 18. When the ball screw 11 is stretched to a certain distance, the anti-rotation nut 18 engages with the screw nut 112 of the ball screw 11 to limit its movement, so as to prevent the ball screw 11 from rotating out when it moves axially, thus ensuring the reliable and safe operation of the damper.

[0073] like Figure 2 As shown, the outer sleeve 12 includes a sleeve body 121 and an inner sleeve end tube 122. The sleeve body 121 and the inner sleeve end tube 122 are connected by a limiting end cap. The lead screw nut 112 and the magnet mounting bracket 16 are mounted on the sleeve body 121 by roller bearings 172. The inner sleeve end tube 122 is fixedly connected to the controlled structure. Preferably, the outer sleeve 12 is a steel sleeve.

[0074] In this embodiment, the inner sleeve end tube 122 includes a sleeve joint outer tube 1221 and an extension tube 1222, which are fixedly connected. The sleeve joint outer tube 1221 is connected to the controlled structure. Meanwhile, the ball screw 11 is driven to the controlled structure through its end, which includes a screw joint outer tube 1111, which is welded and fixedly connected to the upper limit ring.

[0075] In this embodiment, the working process of the impact damper is as follows: When the controlled structure (cable, sling, beam, etc.) vibrates under the action of external load, it drives the movable end of the ball screw 11 to reciprocate. When the controlled structure moves towards the wire rope 211, and the compression limiting part 221 moves downward and contacts the annular movable end cap 25 of the moving end of the wire rope 211, the annular movable end cap 25 moves along with the compression limiting part 221 and compresses the wire rope 211. The wire rope 211 generates a frictional damping force that restricts the compression limiting part 221 from continuing to move downward. At the same time, due to its compression deformation, some of the elastic potential energy is converted into heat energy and consumed. When the compression limiting part 221 returns, the annular movable end cap 25 pushes the compression limiting part 221 back under the action of elastic force until the annular movable end cap 25 returns to the initial position and disengages from the compression limiting part 221. During the return process, the wire rope 211 returns to the point where it no longer provides stiffness and damping.

[0076] When the controlled structure moves away from the direction of the wire rope 211, and the tension limiting part 222 moves upward and contacts the annular movable end cap 25 at the moving end of the wire rope 211, the annular movable end cap 25 moves along with the tension limiting part 222 and stretches the wire rope 211. The wire rope 211 generates a frictional damping force that restricts the compression limiting part 221 from continuing to move upward. At the same time, due to its stretching deformation, some of the elastic potential energy is converted into heat energy and dissipated. When the tension limiting part 222 returns, the annular movable end cap 25 pushes the tension limiting part 222 back under the action of elastic force until the annular movable end cap 25 returns to its initial position and disengages from the compression limiting part 222. During the return process, the wire rope 211 returns to the point where it no longer provides stiffness and damping.

[0077] Under small displacement impacts on the controlled structure, this invention utilizes an eddy current damping unit 1 combined with a ball screw 11 to convert axial vibration into accelerated rotational motion, dissipating energy through the eddy current damping components. When the vibration displacement exceeds a certain range, a frictional damping force and an elastic restoring force provided by a buffer damping unit 2 are added to the original eddy current damping force, effectively further absorbing the energy generated by large displacement impacts and largely preventing damage to the damper itself from the impact.

[0078] Example 2

[0079] Figures 5 to 9Another embodiment of the impact damper of the present invention is shown. This embodiment is basically the same as the previous embodiment, except that one end of the elastic stiffness member 21 is fixedly connected to the lead screw 111, and the other end of the elastic stiffness member 21 is connected to the outer sleeve 12 through the sliding impact-resistant unit 3. In this embodiment, the sliding impact-resistant unit 3 includes a guide rail assembly 31 and a non-Newtonian fluid 32. The guide rail assembly 31 is slidably disposed in the axial direction of the outer sleeve 12. The non-Newtonian fluid 32 is disposed inside the guide rail assembly 31. When the damper is not impacted, the non-Newtonian fluid 32 is in a liquid state. The elastic stiffness member 21 can move through the guide rail assembly 31. At this time, the elastic stiffness member 21 moves as a whole with the force of the controlled structure, and the elastic stiffness member 21 itself does not deform. When the non-Newtonian fluid 32 is impacted, the force increases and hardens. The guide rail pair of the guide rail assembly 31 is relatively stationary and does not slide relative to each other. The end of the elastic stiffness member 21 connected to the controlled structure moves, while the end connected to the sliding anti-impact unit 3 is stationary. The elastic stiffness member 21 deforms under the action of the lead screw 111, which activates the buffer damping unit, thereby generating resistance and effectively resisting impact, effectively protecting the damper and preventing the damper from being damaged by impact.

[0080] Furthermore, such as Figures 8 to 11 As shown, the guide rail assembly 31 includes a sliding connecting block 311 and a guide rail 312. The sliding connecting block 311 has a fluid cavity 3111 inside. An elastic stiffener 21 is connected to the sliding connecting block 311 via a wire rope connection hole 3112. The sliding connecting block 311 slides on the guide rail 312. When the damper is subjected to impact and the non-Newtonian fluid 32 hardens, the sliding connecting block 311 and the guide rail 312 are rigidly connected and remain relatively stationary. When the damper is operating normally and the non-Newtonian fluid 32 is in a liquid state, the sliding connecting block 311 slides relative to the guide rail 312. One end of the elastic stiffener 21 moves with the controlled structure, and the other end moves with the sliding connecting block 311 on the guide rail 312. At this time, the elastic stiffener 21 does not function. Meanwhile, the guide rail 312 is installed axially on the outer sleeve 12. The guide rail 312 is provided with a limiting flow passage 313 located in the middle of the fluid cavity 3111. The limiting flow passage 313 is provided with a flow passage hole 314. The non-Newtonian fluid 32 is disposed in the fluid cavity 3111 and the flow passage hole 314. The setting of the flow passage hole 314 allows the sliding connecting block 311 to move reliably relative to the guide rail 312 when the damper is operating normally and the non-Newtonian fluid 32 is in a liquid state, without producing a damping effect. Through ingenious structural design, this invention ensures both the impact damping function and the reliable and safe operation of the damper during normal operation. Moreover, its overall structure is simple, compact, and occupies little space.

[0081] Preferably, the upper surface of the sliding connecting block 311 is provided with a liquid injection plug 33 to facilitate the injection and replacement of non-Newtonian fluid 32 into the fluid cavity 3111. Sealing elements 34 are provided at both ends of the fluid cavity 3111 to prevent leakage of the non-Newtonian fluid 32 and ensure reliable and safe operation of the damper under different operating conditions.

[0082] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An impact damper, characterized in that, The system includes an eddy current damping unit and a buffer damping unit. The eddy current damping unit includes a ball screw driven and connected to the controlled structure, and a fixed outer sleeve. The outer sleeve is located outside the ball screw. The buffer damping unit includes an elastic stiffness member located near the drive connection end of the ball screw. One end of the elastic stiffness member is sleeved outside the lead screw of the ball screw, and the other end is connected to the outer sleeve. One end of the elastic stiffness member deforms and activates the buffer damping unit when the controlled structure reaches a preset displacement value or a preset impact value. One end of the elastic stiffness member is movably sleeved outside the lead screw of the ball screw, and the other end is fixedly connected to the outer sleeve. The lead screw has an energy-dissipating limiting part that limits the moving end of the elastic stiffness member. The initial distance between the energy-dissipating limiting part and the moving end of the elastic stiffness member is the initial operating distance for activating the buffer damping unit. The energy-consuming limiting part includes a compression limiting part, which is located outside the elastic stiffness member and close to the drive connection end of the lead screw. The initial action distance is the compression action distance between the compression limiting part and the elastic stiffness member. When the displacement of the controlled structure is less than or equal to the initial action distance, the output force of the impact damper is the eddy current damping force of the eddy current damping unit. When the controlled structure moves toward the elastic stiffness member, and the displacement of the controlled structure is greater than the compression distance, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit, the deformation damping force generated by the buffer damping unit, and the anti-deformation elastic force. When the controlled structure moves away from the elastic stiffness member and the displacement of the controlled structure is greater than the compression distance, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit and the anti-deformation elastic force generated by the buffer damping unit.

2. The impact damper according to claim 1, characterized in that, The energy-consuming limiting part further includes a tension limiting part, which is located inside the elastic stiffness member, and the initial action distance is the tension action distance between the tension limiting part and the elastic stiffness member. When the controlled structure moves away from the elastic stiffness member and the displacement of the controlled structure is greater than the tension spacing, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit, the deformation damping force generated by the buffer damping unit, and the anti-deformation elastic force. When the controlled structure moves toward the elastic stiffness member, and the displacement of the controlled structure is greater than the tension spacing, the output force of the impact damper is the sum of the eddy current damping force of the eddy current damping unit and the anti-deformation elastic force generated by the buffer damping unit.

3. The impact damper according to claim 2, characterized in that, The output force of the impact damper, the damping force of the eddy current damping unit, and the damping force of the buffer damping unit satisfy the following relationship: ， in, To withstand the output force of the impact damper, is the damping coefficient of the eddy current damping element. For the deformation damping coefficient of the elastic stiffness component, The displacement of the controlled structure, For the speed of the controlled structure, The initial working distance between the energy-dissipating limiting part and the elastic stiffening part. This is the stiffness coefficient of an elastic stiffness component.

4. An impact damper, characterized in that, The system includes an eddy current damping unit and a buffer damping unit. The eddy current damping unit includes a ball screw driven and connected to the controlled structure, and a fixed outer sleeve, which is located outside the ball screw. The buffer damping unit includes an elastic stiffness member located near the drive connection end of the ball screw. One end of the elastic stiffness member is sleeved outside the lead screw of the ball screw, and the other end is connected to the outer sleeve. One end of the elastic stiffness member deforms and activates the buffer damping unit when the controlled structure reaches a preset displacement value or a preset impact value. One end of the elastic stiffness member is fixedly connected to the lead screw, and the other end is connected to the outer sleeve through a sliding anti-impact unit. The sliding anti-impact unit includes a guide rail assembly and a non-Newtonian fluid. The guide rail assembly is... The non-Newtonian fluid is disposed within the guide rail assembly along the axial direction of the outer sleeve. When the damper is not impacted, the non-Newtonian fluid is in a liquid state. The elastic stiffness element moves through the guide rail assembly without deformation. When the damper is impacted, the non-Newtonian fluid hardens under stress. The guide rail pairs of the guide rail assembly remain relatively stationary. The elastic stiffness element deforms under the action of the lead screw, activating the buffer damping unit. The guide rail assembly includes a sliding connecting block that drives the fluid cavity, and a guide rail installed on the outer sleeve. The elastic stiffness element is connected to the sliding connecting block. The guide rail has a limiting flow passage located in the middle of the fluid cavity, and the limiting flow passage has a flow-through hole. The non-Newtonian fluid is disposed within the fluid cavity and the flow-through hole.

5. The shock damper according to any one of claims 1 to 4, characterized in that, The eddy current damping unit further includes an energy dissipation component, which includes an energy dissipation magnet and a conductor cylinder. The ball screw nut is axially limited, and the ball screw nut is connected to a magnet mounting bracket via a torque transmission key. The energy dissipation magnets are arranged in an array on the magnet mounting bracket. The conductor cylinder is arranged opposite to the energy dissipation magnets and is installed on the outer sleeve.

6. The shock damper according to claim 5, characterized in that, A bearing component is provided between the lead screw nut and the magnet mounting bracket and the outer sleeve to ensure stable rotation of the lead screw nut and the magnet mounting bracket. The bearing component includes roller bearings provided on the lead screw nut and the magnet mounting bracket. The lead screw nut of the ball screw is axially limited by a limiting end cap. The limiting end cap is provided at both ends of the outer sleeve and presses the roller bearing.

7. The shock damper according to any one of claims 1 to 4, characterized in that, The ball screw is provided with an anti-rotation nut at one end inside the outer sleeve to prevent it from unscrewing when the ball screw moves axially. The anti-rotation nut engages with the ball screw nut for limiting the movement when the screw is stretched a certain distance.

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