Eddy current damper

Abstract

The invention relates to the technical field of bridge structure vibration control, in particular to an eddy current damper. Comprising a middle bearing supporting assembly, a damper barrel and at least one movable rack. Wherein the middle bearing supporting assembly is used for being connected with a main tower connecting piece; the damper barrel is connected with the middle bearing supporting assembly, the middle of the damper barrel is supported on the middle bearing supporting assembly, and at least one damping transmission assembly is arranged on the damper barrel; and the movable racks are movably arranged on the damper cylinder, one ends of the movable racks are meshed with the damping transmission assembly, and the other ends of the movable racks are used for being connected with a main beam. According to the embodiment of the invention, the supporting position of the damper is optimized to be a main middle support, so that the secondary stress of a structural member caused by overlarge self weight is greatly reduced, and the internal friction among the gear, the rack and other structural members caused by the self weight is reduced, thereby enhancing the reliability of the axial tension and compression energy consumption of the eddy current damper, and prolonging the service life of the eddy current damper. And the durability and the service life of the damper in long-term use are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge structure vibration control, and in particular to an eddy current damper. Background Art

[0002] With the vigorous development of my country's transportation industry, cable-stayed and suspension bridges, as the main structural forms of ultra-long-span bridges, are playing an increasingly important role. Improving the seismic and vibration suppression capabilities of long-span bridges has become a focus of great concern in the industry. Currently, viscous fluid dampers are widely used for longitudinal vibration reduction in the main beams of long-span bridges. However, viscous fluid dampers generally use seals to enclose fluids such as silicone oil within a steel cylinder. The relative motion of the piston and the steel cylinder compresses the silicone oil to provide damping force. Long-term use inevitably leads to a series of problems such as seal aging, cylinder oil leakage, piston assembly wear, and damper performance degradation. Against this backdrop, other forms of damping energy dissipation have emerged, the most representative of which is the eddy current damper based on electromagnetic theory.

[0003] In related technologies, eddy current dampers generally utilize the principle of electromagnetic induction. The relative motion of an electromagnet and a conductive plate generates eddy currents on the conductive plate. The magnetic field generated by these eddy currents reacts with the original magnetic field to form a damping force. However, since all components of an eddy current damper are essentially steel, their deadweight is much greater than that of a viscous damper for equivalent stroke and damping force. This results in a generally lower energy density (damping coefficient per unit volume). Furthermore, the excessive deadweight creates significant additional bending stress on transmission components, resulting in low damping efficiency. Summary of the Invention

[0004] In the related art, the excessive weight of the eddy current damper causes excessive bending stress to be added to the internal transmission components, thereby affecting the damping efficiency.

[0005] In a first aspect, an embodiment of the present application provides a large-tonnage eddy current damper, comprising: a center bearing support assembly, a damper cylinder, and at least one movable rack; wherein, A center bearing support assembly, which is used to connect with the main tower connector; A damper cylinder, which is connected to the center bearing support assembly, and the middle part of the damper cylinder is supported on the center bearing support assembly, and the damper cylinder is provided with at least one set of damping transmission components; At least one movable rack is movably arranged on the damper cylinder, one end of the movable rack is engaged with the damping transmission assembly, and the other end is used to be connected to the main beam connecting piece.

[0006] In combination with the first aspect, in one embodiment, at least two groups of the damping transmission components and at least two movable racks are provided on the damper cylinder, each of the movable racks is engaged with a group of the damping transmission components, and the two movable racks are symmetrically arranged with the central axis of the damper cylinder as the center line.

[0007] In combination with the first aspect, in one embodiment, at least one connecting ear plate is provided on the damper cylinder, and two movable racks are symmetrically provided on both sides of the connecting ear plate.

[0008] In combination with the first aspect, in one embodiment, two connecting ear plates are provided on the damper cylinder, and one of the movable racks is provided on each of the two connecting ear plates.

[0009] In combination with the first aspect, in one embodiment, a slideway is provided inside the damper cylinder, and the slideway is engaged with the movable rack.

[0010] In conjunction with the first aspect, in one embodiment, the center bearing support assembly includes: A bottom plate connecting plate, which is used to connect with the main tower connecting piece; Two side wall plates, the two side wall plates are spaced apart on the bottom plate connecting plate, and the two side wall plates are connected to the damper cylinder through a first pin shaft; A connecting frame is assembled between the two side wall plates. The connecting frame is provided with a through hole for the first pin to pass through. The connecting frame is connected to the damper cylinder through a second pin.

[0011] In combination with the first aspect, in one embodiment, the damping transmission assembly includes: a gear transmission part, which is assembled in the damper cylinder and meshes with the movable rack; A connecting shaft is arranged in the damper cylinder, the connecting shaft is engaged with the gear transmission part, two ends of the connecting shaft extend out of the damper cylinder, and eddy current disks are provided at both ends of the connecting shaft.

[0012] In combination with the first aspect, in one embodiment, a plurality of grooves are provided on the eddy current disk, and permanent magnets are provided in the grooves.

[0013] In combination with the first aspect, in one embodiment, four damping transmission assemblies and two movable racks are provided on the damper cylinder, each movable rack is engaged with two groups of damping transmission assemblies, the two movable racks are symmetrically arranged with the central axis of the damper cylinder as the center line, and the four damping transmission assemblies are symmetrically arranged in groups of two with the center of the damper cylinder.

[0014] The beneficial effects of the technical solutions provided in the embodiments of the present application include: The applicant's analysis revealed that the eddy current damper, while heavy, lacks support in the middle, leading to excessive internal friction between the gears, rack, and other structural components of the eddy current damper caused by its own weight. In the embodiments of this application, the damper's support position is changed through a center support assembly, optimizing the damper from conventional two-end support to a primary center support. This significantly reduces the secondary stress in the structural components caused by excessive deadweight, and reduces the internal friction between the gears, rack, and other structural components caused by deadweight, thereby enhancing the reliability of the eddy current damper's axial tensile and compressive energy dissipation, as well as the durability and service life of the damper over long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 This is a schematic structural diagram of an eddy current damper in an embodiment of the present application; Figure 2 This is a structural diagram of the bearing support assembly in an embodiment of the present application; Figure 3 This is a front view of the eddy current damper in the embodiment of the present application; Figure 4 is a cross-sectional view of an eddy current damper in an embodiment of the present application; Figure 5 This is a top view of the eddy current damper in an embodiment of the present application.

[0017] In the figure: 1. Center bearing support assembly; 11. Bottom plate connecting plate; 12. Side wall plate; 13. First pin shaft; 14. Connecting frame; 2. Damper cylinder; 3. Damping transmission assembly; 31. Gear; 32. Eddy current disk; 4. Movable rack; 5. Connecting ear plate; 6. Permanent magnet. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In the related art, the excessive weight of the eddy current damper causes excessive bending stress to be added to the internal transmission components, thereby affecting the damping efficiency.

[0020] First, as Figure 1 As shown, the present application provides a large-tonnage eddy current damper, which includes: a center bearing support assembly 1, a damper cylinder 2 and at least one movable rack 4; wherein, The middle bearing support assembly 1 is used to connect with the main tower connector; The damper cylinder 2 is connected to the middle bearing support assembly 1, and the middle part of the damper cylinder 2 is supported on the middle bearing support assembly 1. The damper cylinder 2 is provided with at least one set of damping transmission assembly 3; at least one movable rack 4 is movably arranged on the damper cylinder 2, one end of the movable rack 4 is engaged with the damping transmission assembly 3, and the other end is used to be connected to the main beam connecting piece.

[0021] It is worth noting that the eddy current damper has a large deadweight and lacks support in the middle, resulting in excessive internal friction between the gears, racks, and other structural components of the eddy current damper caused by its own weight. In the above-mentioned embodiment of the present application, the support position of the damper is changed by using a center-support assembly, and the damper is optimized from conventional two-end support to a main center support. This greatly reduces the secondary stress of the structural components caused by excessive deadweight and reduces the internal friction between the gears, racks, and other structural components caused by deadweight, thereby enhancing the reliability of the axial tensile and compressive energy consumption of the eddy current damper, as well as the durability and service life of the damper in long-term use.

[0022] In some preferred embodiments, Figure 3 and Figure 5 As shown, at least two groups of the damping transmission components 3 and at least two movable racks 4 are provided on the damper cylinder 2, each of the movable racks 4 is engaged with a group of the damping transmission components 3, and the two movable racks 4 are symmetrically arranged with the central axis of the damper cylinder 2 as the center line.

[0023] It is understandable that the displacement of the main beam will drive the movable rack 4 to telescopically move in the damper cylinder 2, thereby driving the damping transmission assembly 3 to move and generate damping and feedback to the movable rack 4. The mid-support large-tonnage eddy current damper described in the above embodiment adopts a telescopic mechanism with a double movable rack 4, which increases the rack's load-bearing capacity and provides a possibility and safety reserve for achieving a large tonnage of the damper. The double rack structure allows the entire structure to be symmetrical about the center line. Compared with a single rack, the gear rack is more evenly stressed, reducing the internal stress and internal friction caused by the eccentric load, and improving the energy efficiency of the damper.

[0024] Furthermore, the damping transmission assembly 3 includes a gear meshing with the movable rack 4, and a multi-stage gear subsequently mated with the gear. The main gear and multiple secondary gears are symmetrically distributed on both sides of the rack, and the secondary gears are fixedly connected to the wall of the eddy current damper cylinder.

[0025] In a first optional embodiment of the present application, at least one connecting ear plate 5 is provided on the damper cylinder 2 , and two movable racks 4 are symmetrically provided on both sides of the connecting ear plate 5 .

[0026] In a second optional implementation manner of the present application, two connecting ear plates 5 are provided on the damper cylinder 2 , and each of the two connecting ear plates 5 is provided with a movable rack 4 .

[0027] It is worth noting that, optionally, the connecting lug plate 5 is connected to the main beam connector by a pin. The connecting lug plate 5 is used to be connected to the main beam connector, and the connecting lug plate 5 moves with the main beam connector to drive the rack to move telescopically in the damper cylinder 2.

[0028] Furthermore, a slideway is provided inside the damper cylinder 2 , and the slideway is engaged with the movable rack 4 .

[0029] It can be understood that the movable rack 4 can move along the slideway.

[0030] In some specific embodiments, Figure 2 As shown, the center support assembly 1 includes: a bottom plate connecting plate 11, two side wall plates 12 and a connecting frame 14; wherein, A base plate connecting plate 11, which is used to be connected to the main tower connecting piece; two side wall plates 12, the two side wall plates 12 are arranged at intervals on the base plate connecting plate 11, and the two side wall plates 12 are connected to the damper cylinder 2 through a first pin shaft 13; a connecting frame 14, which is assembled between the two side wall plates 12, and the connecting frame 14 is provided with a through hole for the first pin shaft 13 to pass through, and the connecting frame 14 is connected to the damper cylinder 2 through a second pin shaft.

[0031] Optionally, the base plate connecting plate 11 and the main tower connecting piece are connected by pre-buried anchor bolts or welding.

[0032] Furthermore, bearings are provided on the tops of the two sidewall plates 12 and the connecting frame 14, and the first pin 13 passes through the sidewall plates 12 and the connecting frame 14 via the bearings and is connected to the damper cylinder 2. The second pin passes through the bearing on the top of the connecting frame 14 and is connected to the damper cylinder 2, connecting the connecting frame 14 and the damper cylinder 2 as a whole.

[0033] It's worth noting that in the above-mentioned embodiment, the damper cylinder and the center-through assembly are connected using bearings and pins. The left and right pins ensure vertical rotation of the damper, while the upper and lower pins ensure horizontal rotation. These four sets of bearings and pins ensure wide-angle rotation of the damper at any spatial angle. While ensuring longitudinal bridge expansion and contraction energy dissipation, the damper can also accommodate large lateral displacements of the main girder relative to the main tower under various loads.

[0034] In some specific implementations, such as Figure 4 As shown, the damping transmission assembly 3 includes: A gear transmission part is assembled in the damper cylinder 2, and the gear transmission part is engaged with the movable rack 4; a connecting shaft is arranged in the damper cylinder 2, and the connecting shaft is engaged with the gear transmission part, and both ends of the connecting shaft extend out of the damper cylinder 2, and vortex disks 32 are provided at both ends of the connecting shaft.

[0035] It should be noted that the large diameter gear 31 of the first stage meshes with the small diameter gear 31 of the second stage, in a reciprocating pattern, until the large gear of the penultimate gear 31 meshes with the small gear of the vortex disc. The large diameter and small diameter gears of each stage 31 are coaxially fixed to one another; the vortex disc and its small gear are coaxially fixed to one another, with the vortex disc located outside the damper cylinder 2 and the small gear inside.

[0036] Furthermore, the two vortex discs 32 are connected by a connecting shaft, and the two vortex discs 32 are respectively arranged on the upper and lower sides of the damper cylinder. The two vortex discs 32 are axially symmetrically arranged with respect to the damper cylinder 2, and the connecting shaft is engaged with the gear transmission part.

[0037] It is worth noting that a gear is provided on the connecting shaft, namely, the eddy current disc 32 is coaxially fixedly connected to the final gear of the gear transmission. The final gear and the eddy current disc 32 are located on the inner and outer sides of the eddy current damper cylinder wall. Specifically, the final gear is located on the inner side of the eddy current damper cylinder wall, and the eddy current disc 32 is located on the outer side of the eddy current damper cylinder wall.

[0038] In some optional embodiments, a plurality of grooves are formed on the eddy current disk 32 , and permanent magnets 6 are disposed in the grooves.

[0039] It should be noted that the eddy current disk 32 has an even number of grooves uniformly arranged along the circumference of one side near the damper cylinder wall. Each groove houses a permanent magnet. The magnetic poles of the permanent magnets are staggered, meaning that if one permanent magnet has its N pole facing the damper cylinder wall, the adjacent permanent magnet has its S pole facing the damper cylinder wall.

[0040] In some preferred embodiments, the damper cylinder 2 includes an aluminum plate and a steel plate, and the aluminum plate and the steel plate are stacked.

[0041] Specifically, a gap of 1 mm to 3 mm is provided between the permanent magnet 6 and the damper wall. The damper wall opposite the permanent magnet is constructed from two laminated plates. The outer plate adjacent to the permanent magnet 6 is aluminum, while the inner plate beneath it is steel. The aluminum plate is 2 to 10 mm thick, while the steel plate is 20 to 50 mm thick.

[0042] The working principle of the above-mentioned embodiment of the eddy current damper includes: When the main beam and main tower undergo longitudinal displacement relative to each other, the two movable racks 4 of the damper undergo longitudinal expansion and contraction relative to the damper cylinder 2. The axial linear motion of the movable racks 4 rotates the gears 31 connected to them, which in turn rotates the gears 31 of the following stages. Furthermore, due to the multi-stage gear transmission, the last gear in the final stage rotates the vortex disc 32. The vortex disc 32 is coaxially fixed to the damper cylinder wall as is the last gear. The vortex disc 32 is located outside the damper cylinder, while the gears 31 are displaced inside.

[0043] Since the eddy current disk is close to the inner edge of the damper cylinder, it has an even number of grooves, and each groove is embedded with a permanent magnet, and the N-level and S-level permanent magnets are staggered. Therefore, during the rotation of the eddy current disk 32, the staggered magnets generate a changing magnetic field, and the changing magnetic field forms eddy currents on the outside of the damper cylinder 2 and on the eddy current disk 32. The magnetic field formed by the eddy current reacts on the magnet, forming a damping force. The damping force exerted on the magnet is amplified by multiple gears 31 in multiple stages, transmitted to the rack, forming the final damping force, and transmitted to the main beam through the pin shaft on the connecting ear plate 5. The comprehensive damping force on the connecting ear plate 5 is the resultant force formed by the electromagnetic force conducted on the four eddy current disks 32.

[0044] As can be understood, due to the structural symmetry, the damping force generated by the upper and lower eddy current discs 32 on one side of the damper's axial centerline is amplified by the gear 31 in multiple stages before being transmitted to the movable rack 4 on that side. Similarly, the damping force generated by the upper and lower eddy current discs 32 on the other side of the centerline is amplified by the gear 31 in multiple stages before being transmitted to the movable rack 4 on that side. Furthermore, the forces acting on both racks are equal in magnitude and direction. This embodiment achieves the high-tonnage damping force required for main beam vibration reduction by amplifying the electromagnetic damping force generated by the four eddy current discs 32 in multiple stages and transmitting it to the main beam via the dual movable racks 4.

[0045] The present application provides two specific embodiments, in which four damping transmission assemblies 3 and two movable racks 4 are provided on the damper cylinder 2, each movable rack 4 is engaged with two groups of damping transmission assemblies 3, the two movable racks 4 are symmetrically arranged with the central axis of the damper cylinder 2 as the center line, and the four damping transmission assemblies 3 are symmetrically arranged in groups of two with respect to the center of the damper cylinder 2.

[0046] It can be understood that the four damping transmission assemblies 3 can be provided with eight eddy current disks 32 .

[0047] It is worth noting that due to the mid-support structure, the eddy current damper can be set up as two or more groups of eddy current disks, which will slightly increase the dead weight without affecting the energy consumption efficiency, thus providing technical support for the realization of eddy current dampers with a tonnage of 400t and above.

[0048] The working principle of the second specific embodiment of the eddy current damper includes: As the dual racks reciprocate and extend along the axial direction, the two sets of gears 31 and eddy current plates 32 on either side of the center support assembly rotate synchronously, and the eight eddy current plates 32 in both sets simultaneously generate damping forces. Due to the structural symmetry, the damping force generated by the four upper and lower eddy current plates 32 on one side of the damper's axial centerline (two on each side of the center support assembly 1) is amplified by the gears 31 in multiple stages before being transmitted to the movable rack 4 on that side. The damping force generated by the four upper and lower eddy current plates 32 on the other side of the centerline (two on each side of the center support assembly) is amplified by the gears 31 in multiple stages before being transmitted to the movable rack 4 on that side. Furthermore, the forces acting on both racks are equal in magnitude and direction.

[0049] It can be understood that this embodiment forms the large-tonnage damping force required for main beam shock absorption by amplifying the electromagnetic damping force on the eight eddy current disks through multiple stages and transmitting it to the main beam through the double racks.

[0050] In summary, the mid-span, large-tonnage eddy current damper described in the present invention changes the damper's support position through a mid-span assembly, optimizing the damper from conventional two-end support to a primary center support. This significantly reduces the secondary stresses in structural components caused by excessive deadweight and the internal friction between gears, racks, and other structural components caused by deadweight, thereby enhancing the reliability of the eddy current damper's axial tensile and compressive energy dissipation, as well as the damper's long-term durability and service life. Furthermore, the mid-span, large-tonnage eddy current damper described in the present invention utilizes a double-rack telescopic mechanism, increasing the rack's load-bearing capacity and providing both the possibility and safety margin for achieving large damper tonnage. On the one hand, the double-rack structure allows the entire structure to be symmetrical about the centerline. Compared with a single rack, the gear rack is more evenly stressed, reducing the internal stress and internal friction caused by the offset load, and improving the energy efficiency of the damper. On the other hand, due to the mid-support structure, the eddy current damper can be set up as two or more groups of eddy current disks. While slightly increasing the deadweight, it does not affect the energy efficiency, thus providing technical support for the realization of eddy current dampers of 400t and above. In addition, the mid-support large-tonnage eddy current damper described in the present invention uses bearings and pins to connect the damper cylinder and the mid-support assembly. The left and right pins ensure the rotation of the damper in the vertical plane, and the upper and lower pins ensure the rotation of the damper in the horizontal plane. The four groups of bearings and pins ensure the large-angle rotation of the damper at any angle in space. While ensuring the longitudinal expansion and contraction energy consumption of the bridge, the damper can adapt to the large lateral displacement deflection of the main beam relative to the main tower under various loads.

[0051] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0053] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A large-tonnage eddy current damper, characterized in that: include: A center bearing support assembly (1), which is used to be connected to the main tower connecting member; A damper cylinder (2) is connected to the middle bearing support assembly (1), and the middle portion of the damper cylinder (2) is supported on the middle bearing support assembly (1), and at least one set of damping transmission assemblies (3) is provided on the damper cylinder (2); At least one movable rack (4) is movably arranged on the damper cylinder (2); one end of the movable rack (4) is engaged with the damping transmission assembly (3), and the other end is used to be connected to the main beam connecting member.

2. The large-tonnage eddy current damper according to claim 1, characterized in that: The damper cylinder (2) is provided with at least two groups of the damping transmission components (3) and at least two movable racks (4), each of the movable racks (4) is engaged with one group of the damping transmission components (3), and the two movable racks (4) are symmetrically arranged with the central axis of the damper cylinder (2) as the center line.

3. The large-tonnage eddy current damper according to claim 2, characterized in that: At least one connecting lug (5) is provided on the damper cylinder (2), and two movable racks (4) are symmetrically provided on both sides of the connecting lug (5).

4. The large-tonnage eddy current damper according to claim 2, characterized in that: Two connecting lugs (5) are provided on the damper cylinder (2), and each of the two connecting lugs (5) is provided with a movable rack (4).

5. The large-tonnage eddy current damper according to claim 1, characterized in that: A slideway is provided on the inner side of the damper cylinder (2), and the slideway is engaged with the movable rack (4).

6. The large-tonnage eddy current damper according to claim 1, characterized in that: The center bearing support assembly (1) comprises: A bottom plate connecting plate (11) for connecting to the main tower connecting piece; Two side wall plates (12), the two side wall plates (12) are spaced apart on the bottom plate connecting plate (11), and the two side wall plates (12) are connected to the damper cylinder (2) via a first pin shaft (13); A connecting frame (14) is arranged between the two side wall plates (12); a through hole is provided on the connecting frame (14) for the first pin shaft (13) to pass through; and the connecting frame (14) is connected to the damper cylinder (2) via a second pin shaft.

7. The large-tonnage eddy current damper according to claim 1, characterized in that: The damping transmission assembly (3) comprises: A gear transmission part is arranged in the damper cylinder (2), and the gear transmission part is engaged with the movable rack (4); A connecting shaft is disposed in the damper cylinder (2), the connecting shaft meshing with the gear transmission portion, both ends of the connecting shaft extending out of the damper cylinder (2), and both ends of the connecting shaft are provided with vortex disks (32).

8. The large-tonnage eddy current damper according to claim 7, characterized in that: The eddy current disk (32) is provided with a plurality of grooves, and permanent magnets (6) are provided in the grooves.

9. The large-tonnage eddy current damper according to claim 1, characterized in that: The damper cylinder (2) is provided with four damping transmission assemblies (3) and two movable racks (4), each movable rack (4) is engaged with two groups of damping transmission assemblies (3), the two movable racks (4) are symmetrically arranged with the central axis of the damper cylinder (2) as the center line, and the four damping transmission assemblies (3) are arranged in groups of two symmetrically with the center of the damper cylinder (2).

10. The large-tonnage eddy current damper according to claim 1, characterized in that: The damper cylinder (2) comprises an aluminum plate and a steel plate, and the aluminum plate and the steel plate are stacked.

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