A displacement-amplified cam-type rotational damper

Abstract

This invention relates to the field of building vibration reduction, specifically to a displacement-amplified cam-type rotational damper, comprising a box-shaped support plate for fixing to the lower steel beam of a frame structure. A cam-type displacement-amplified energy-dissipating plate is disposed within the box-shaped support plate. The lower two sides of the cam-type displacement-amplified energy-dissipating plate are welded to the inner wall of the box-shaped support plate, and the upper part of the cam-type displacement-amplified energy-dissipating plate is hinged to the box-shaped support plate, with the upper end extending beyond the box-shaped support plate. A horizontal displacement conversion plate is disposed above the cam-type displacement-amplified energy-dissipating plate for fixing to a reinforced concrete beam in the frame structure. A gear and rack engagement is established between the horizontal displacement conversion plate and the cam-type displacement-amplified energy-dissipating plate. This damper achieves energy dissipation through displacement amplification without deforming due to tension caused by horizontal displacement during earthquakes.

Description

Technical Field

[0001] This invention relates to the field of building vibration reduction, specifically to a displacement-amplified cam-type rotational damper. Background Technology

[0002] A reasonable and effective earthquake resistance approach is to add energy-dissipating and damping devices to the structure. These devices, along with the structure itself, store and dissipate seismic energy, representing a proactive earthquake resistance concept. Increasing the number of seismic isolation and damping devices in buildings plays a crucial role in reducing building damage during earthquakes. By concentrating and dissipating the energy input from a seismic event through dampers, the structural response to an earthquake can be reduced, thus achieving the purpose of vibration reduction. The working principle of energy-dissipating and damping devices is to install them at specific locations on the building structure. Under earthquake or strong wind loads, the relative displacement between two points on the structure drives the energy-dissipating and damping devices to dissipate the energy generated by structural vibration. However, for structures with relatively small lateral deformation, such as shear walls and braced frames, using dampers with displacement amplification capabilities can amplify the relative horizontal displacement of the structure, absorb more seismic energy, and more effectively improve the structure's seismic performance.

[0003] However, most existing displacement-amplified dampers do not consider the slight deformation of the damper itself due to rotational stretching after horizontal displacement under seismic loading, which ultimately leads to poor energy dissipation and vibration reduction performance of displacement-amplified dampers; and dampers with specific displacement amplification mechanisms are rarely proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a displacement-amplified cam-type rotary damper that can achieve energy dissipation through displacement amplification and avoid deformation of the damper itself due to stretching caused by horizontal displacement caused by earthquake.

[0005] The technical solution of the present invention is as follows: a displacement-amplified cam-type rotational damper, comprising a box-shaped support plate for fixing on the lower steel beam of a frame structure, a cam-type displacement-amplified energy-dissipating plate disposed inside the box-shaped support plate, the lower two sides of the cam-type displacement-amplified energy-dissipating plate being welded to the inner wall of the box-shaped support plate, the upper part of the cam-type displacement-amplified energy-dissipating plate being hinged to the box-shaped support plate, and the upper end of the cam-type displacement-amplified energy-dissipating plate extending out of the box-shaped support plate, and a horizontal displacement conversion plate for fixing on the reinforced concrete beam of the frame structure is disposed on the upper side of the cam-type displacement-amplified energy-dissipating plate, wherein the horizontal displacement conversion plate and the cam-type displacement-amplified energy-dissipating plate are engaged by a gear and rack mechanism.

[0006] Furthermore, the box-shaped support plate includes a pair of L-shaped steel plates, and constraint plates are fixed on both sides between the pair of L-shaped steel plates. The lower ends of the cam-type displacement amplification energy-consuming plate are welded to the constraint plates on both sides respectively.

[0007] Furthermore, bolt holes are spaced apart on the bottom folded edge of the L-shaped steel plate, and a seat plate is provided on the lower side of a pair of L-shaped steel plates. The L-shaped steel plates are connected to the seat plate by bolts passing through the bolt holes.

[0008] Furthermore, the cam-type displacement amplification energy-consuming plate includes a cam-type displacement conversion plate hinged to a box-type support plate via a pivot shaft. The upper end of the cam-type displacement conversion plate is provided with a protruding tooth that engages with a rack disposed on the lower side of the horizontal displacement conversion plate. An energy-consuming steel plate is fixed to the lower end of the cam-type displacement conversion plate, and an arc-shaped plate is fixed to the lower end of the energy-consuming steel plate. The two ends of the arc-shaped plate are welded to the inner wall of the box-type support plate.

[0009] Furthermore, the upper and lower ends of the cam-type displacement conversion plate are respectively provided with an upper arc and a lower arc. The radius of the upper arc is smaller than that of the lower arc. The protruding teeth are provided on the upper arc. The lower arc is welded to the concave surface of the upper arc of the energy-consuming steel plate. The convex surface of the lower arc of the energy-consuming steel plate is welded to the arc plate.

[0010] Furthermore, the centers of the upper arc, lower arc, concave arc, convex arc, and arc plate are all concentric with the center of the pin shaft.

[0011] Furthermore, the energy-consuming steel plate is provided with energy-consuming circular holes spaced apart.

[0012] Furthermore, the horizontal displacement conversion plate is T-shaped, and the lower side of the horizontal displacement conversion plate is provided with toothed grooves at intervals along the lateral direction to form a toothed rack. Bolt holes for passing bolts are provided at intervals on the horizontal displacement conversion plate.

[0013] Compared with the prior art, the present invention has the following advantages: 1. This damper can achieve energy dissipation through displacement amplification, and it can also prevent the damper itself from deforming due to tension caused by horizontal displacement caused by earthquakes, thus affecting the displacement amplification effect and reducing the degree of building structure response in earthquakes.

[0014] 2. This damper dissipates seismic energy by machining circular holes in the energy-dissipating steel plate, causing the steel plate to yield and fail before other parts under seismic loads.

[0015] 3. The damper is welded to the lower arc plate, which connects the box-shaped support plate to the cam-type displacement amplification energy dissipation plate to prevent the damper from becoming unstable when subjected to out-of-plane forces, and at the same time effectively improves the overall stiffness of the structure.

[0016] 4. The energy dissipation mechanism of this damper involves welding and fixing the arc-shaped plate to the box-type support plate around its perimeter. A cam-type displacement amplification energy dissipation plate is hinged to the box-type support plate via a pin. The box-type support plate provides support for the cam-type displacement amplification energy dissipation plate, ensuring that the lower part does not rotate when the upper part of the cam-type displacement conversion plate moves horizontally with the frame structure. The horizontal displacement generated under seismic action is amplified into a circular displacement of the same multiple by the gears on the cam-type displacement conversion plate and the tooth grooves of the horizontal displacement conversion plate, according to the ratio of the radii of the two concentric arcs in the cam-type displacement conversion plate. The torque transmitted by the relative rotation is borne by the energy dissipation plate weakened by the open circular hole. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the displacement-amplified cam-type rotational damper of the present invention; Figure 2 This is an exploded view of the displacement-amplified cam-type rotational damper of the present invention. Figure 3 This is a schematic diagram of the front structure of the horizontal displacement conversion plate of the present invention; Figure 4 This is a schematic diagram of the side structure of the horizontal displacement conversion plate of the present invention; Figure 5 This is a schematic diagram of the structure of the cam-type displacement amplification energy dissipation board of the present invention; Figure 6 This is a schematic diagram of the fit between the constraint plate and the L-shaped steel plate of the present invention; Figure 7 This is a schematic diagram showing the connection between the box-type support steel plate of the present invention and the cam-type displacement conversion plate via a pin shaft; Figure 8 This is a schematic diagram showing the conjugate of the gear and the tooth groove of the horizontal displacement conversion plate in the cam-type displacement conversion plate of the present invention; Figure 9 This is a schematic diagram of the deformation of the cam-type displacement amplification energy-consuming plate under stress according to the present invention. Figure 10 This is a schematic diagram illustrating the practical application of the present invention; In the diagram: 1-Lower steel beam, 2-Reinforced concrete beam, 10-Box-type support plate, 11-L-shaped steel plate, 12-Constraint plate, 13-Bolt hole, 14-Seat plate, 15-Bolt, 20-Cam-type displacement amplification energy-consuming plate, 21-Cam-type displacement conversion plate, 22-Protruding tooth, 23-Energy-consuming steel plate, 24-Arc-shaped plate, 25-Pin, 26-Pin nut, 30-Horizontal displacement conversion plate, 31-Rack, 32-Bolt. Detailed Implementation

[0018] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0019] refer to Figures 1 to 10 A displacement-amplified cam-type rotational damper includes a box-shaped support plate 10 fixed to a lower steel beam 1 in a frame structure. A cam-type displacement-amplified energy-dissipating plate 20 is disposed within the box-shaped support plate. The lower sides of the cam-type displacement-amplified energy-dissipating plate are welded to the inner wall of the box-shaped support plate, and the upper part of the cam-type displacement-amplified energy-dissipating plate is hinged to the box-shaped support plate, with the upper end extending beyond the box-shaped support plate. A horizontal displacement conversion plate 30 is disposed above the cam-type displacement-amplified energy-dissipating plate for fixing to a reinforced concrete beam 2 in the frame structure. A gear and rack mechanism is used between the horizontal displacement conversion plate and the cam-type displacement-amplified energy-dissipating plate to ensure continuous gear meshing, facilitating the conversion of horizontal motion into circular motion. This device plays a crucial role in reducing building damage during earthquakes by incorporating seismic mitigation measures, thereby lowering the building structure's response to earthquakes.

[0020] In this embodiment, the box-shaped support plate includes a pair of L-shaped steel plates 11, and vertically arranged constraint plates 12 are welded and fixed on both sides between the pair of L-shaped steel plates, thereby forming a box-shaped support plate. The lower ends of the cam-type displacement amplification energy-consuming plate are welded to the constraint plates on both sides respectively.

[0021] In this embodiment, bolt holes 13 are spaced apart on the bottom folded edge of the L-shaped steel plate, and a base plate 14 is provided on the lower side of a pair of L-shaped steel plates. The L-shaped steel plates are connected to the base plate by bolts 15 passing through the bolt holes. Thus, the base plate connects and fixes the L-shaped steel plates to the lower steel beam.

[0022] In this embodiment, the cam-type displacement amplified energy-consuming plate includes a cam-type displacement conversion plate 21 hinged to a box-shaped support plate via a pin shaft 25. The upper end of the cam-type displacement conversion plate has protruding teeth 22 that engage with a rack 31 located on the lower side of the horizontal displacement conversion plate. An energy-consuming steel plate 23 is fixed to the lower end of the cam-type displacement conversion plate, and an arc-shaped plate 24 is fixed to the lower end of the energy-consuming steel plate. The two ends of the arc-shaped plate are welded to the inner wall of the constraint plate of the box-shaped support plate. By welding the box-shaped support plate to the arc-shaped plate and connecting it to the cam-type displacement amplified energy-consuming plate via a pin shaft, the lower welded portion of the cam-type displacement amplified energy-consuming plate remains fixed during rotation after an earthquake, preventing it from rotating with the load.

[0023] In this embodiment, the upper and lower ends of the cam-type displacement conversion plate are respectively provided with an upper arc and a lower arc. The radius of the upper arc is smaller than the radius of the lower arc. The displacement amplification factor is adjusted by adjusting the ratio of the radius of the lower arc to the upper arc in the cam-type displacement conversion plate. The greater the displacement amplification, the better the energy consumption effect.

[0024] In this embodiment, the upper arc has a groove forming a convex tooth, the lower arc is welded to the upper concave surface of the energy-consuming steel plate, and the lower convex surface of the energy-consuming steel plate is welded to the arc-shaped plate. The centers of the upper arc, lower arc, concave surface, convex surface, and arc-shaped plate are all concentric with the pin shaft axis.

[0025] In this embodiment, the energy-consuming steel plate is provided with energy-consuming circular holes spaced apart. The circular holes in the middle of the energy-consuming steel plate weaken the load. When the cam-type displacement conversion plate starts to rotate under the action of an earthquake, it helps the energy-consuming steel plate to yield and fail first when subjected to a force in the opposite direction to the lower part of the cam-type displacement conversion plate.

[0026] In this embodiment, the horizontal displacement conversion plate is T-shaped, and the lower side of the horizontal displacement conversion plate is provided with toothed grooves to form a toothed rack 31 at intervals along the lateral direction. Bolt holes for passing through bolts 32 are provided at intervals on the horizontal displacement conversion plate.

[0027] Working principle: The L-shaped steel plate and the cam-type displacement amplification energy dissipation plate are hinged together by a pin, while the lower arc-shaped plate is welded and fixed to the box-shaped support steel plate on all four sides. The box-shaped support steel plate, formed by welding the L-shaped steel plate and the constraint plate, provides support for the cam-type displacement amplification energy dissipation plate, and the constraint plates welded to both sides increase the stiffness of the overall damper. This ensures that under seismic loading, the lower part of the cam-type displacement amplification energy dissipation steel plate remains fixed and will not undergo horizontal displacement.

[0028] When the upper horizontal displacement conversion plate moves horizontally along with the frame structure due to seismic forces, the upper part of the cam-type displacement amplification energy-dissipating plate rotates accordingly due to the continuous meshing of the gears, converting the horizontal displacement into a circular displacement. The displacement is amplified by the same factor according to the ratio of the radii of the two concentric arcs. At this time, the rigidity provided by the box-type support plate prevents the lower part of the cam-type displacement conversion plate from rotating at the connection point with the energy-dissipating steel plate. The energy-dissipating steel plate, weakened by the open circular holes, bears the torque transmitted from the cam-type displacement conversion plate, thus dissipating seismic energy propagation and reducing energy transmission during an earthquake, significantly reducing the building structure's response to earthquakes. Figure 9 As shown.

[0029] Meanwhile, since the cam-type displacement amplification energy dissipation plate is arc-shaped, the steel plate itself will not suffer from poor displacement amplification due to stretching after rotation during the process of horizontal motion being converted into circular motion, thus affecting the energy dissipation effect.

[0030] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of displacement-amplifying cam-type rotational dampers based on the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions, and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. A displacement-amplifying cam-type rotational damper, comprising a box-shaped support plate for fixing to the lower steel beam of a frame structure, characterized in that, A cam-type displacement amplification energy-consuming plate is installed inside the box-shaped support plate. The lower sides of the cam-type displacement amplification energy-consuming plate are welded to the inner wall of the box-shaped support plate. The upper part of the cam-type displacement amplification energy-consuming plate is hinged to the box-shaped support plate, and the upper end of the cam-type displacement amplification energy-consuming plate extends out of the box-shaped support plate. A horizontal displacement conversion plate for fixing to the reinforced concrete beam in the frame structure is installed on the upper side of the cam-type displacement amplification energy-consuming plate. The horizontal displacement conversion plate and the cam-type displacement amplification energy-consuming plate are engaged by a gear and rack. The cam-type displacement amplification energy-consuming plate includes a cam-type displacement conversion plate hinged to the box-shaped support plate via a pivot shaft. The upper end of the cam-type displacement conversion plate has protruding teeth that engage with a rack located on the lower side of the horizontal displacement conversion plate. An energy-consuming steel plate is fixed to the lower end of the cam-type displacement conversion plate, and an arc-shaped plate is fixed to the lower end of the energy-consuming steel plate. The arc-shaped plate has protruding teeth on both sides... The upper end is welded to the inner wall of the box-type support plate; the upper and lower ends of the cam-type displacement conversion plate are respectively provided with an upper arc and a lower arc, the radius of the upper arc is smaller than the radius of the lower arc, and the convex teeth are provided on the upper arc. The lower arc is welded to the concave surface of the upper arc of the energy-consuming steel plate, and the convex surface of the lower arc of the energy-consuming steel plate is welded to the arc plate; the center of the upper arc, the lower arc, the concave surface of the arc, the convex surface of the arc and the arc plate are all concentric with the center of the pin shaft; the energy-consuming steel plate is provided with energy-consuming circular holes at intervals; the horizontal displacement conversion plate is T-shaped, and the lower side of the horizontal displacement conversion plate is provided with toothed grooves at intervals to form a toothed rack. The horizontal displacement conversion plate is provided with bolt holes for bolts to pass through at intervals; the box-type support plate includes a pair of L-shaped steel plates, and constraint plates are fixed on both sides between the pair of L-shaped steel plates. The lower ends of the cam-type displacement amplification energy-consuming plate are respectively welded to the constraint plates on both sides.

2. The displacement-amplifying cam-type rotational damper according to claim 1, characterized in that, Bolt holes are spaced apart on the bottom folded edge of the L-shaped steel plate, and a base plate is provided on the lower side of a pair of L-shaped steel plates. The L-shaped steel plates are connected to the base plate by bolts passing through the bolt holes.

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