Self-powered bridge magneto-rheological damper

Abstract

The invention discloses a self-powered bridge magneto-rheological damper, and relates to the technical field of energy dissipation and vibration reduction of engineering structures. The problems that the power generation efficiency of an existing spontaneous electromagnetic rheological damper is generally low, and the power requirements of equipment and other elements are difficult to meet are solved. The magneto-rheological damper specifically comprises a magneto-rheological damper body, a plurality of metal pipes are fixed to the outer wall of the magneto-rheological damper body, and a plurality of piezoelectric ceramic power generation pieces are connected to the inner walls of the metal pipes in a sliding mode. Low-frequency and small-amplitude vibration generated by a bridge structure can be effectively converted into medium-low-frequency and high-energy output electric energy, continuous power supply to the magneto-rheological damper body is achieved, dependence of the magneto-rheological damper body on the mains supply is avoided, under natural disasters such as typhoons, the magneto-rheological damper body can still have sufficient electric energy, and the energy-saving and environment-friendly effects are achieved. By detecting the power generation efficiency of the piezoelectric ceramic power generation sheet, the overall state of the bridge can be detected from the side.

Description

Technical Field

[0001] The invention relates to the technical field of energy dissipation and vibration reduction of engineering structures, and in particular to a self-powered magnetorheological damper for a bridge. Background Art

[0002] With the continuous advancement of science and technology, in order to meet practical needs, more and more long-span bridges are being built. The structures of long-span bridges may be damaged to varying degrees under wind loads.

[0003] At present, the research and engineering application of building bridge engineering structure vibration control are developing rapidly. Structural vibration control systems can be divided into four categories: passive control system, semi-active control system, active control system and hybrid control system. Among them, the semi-active control system combines the advantages of passive control system and active control system. It requires very little energy, the system structure is simpler than the active control system, has higher stability, and has the ability of active control system to controllably change the control force or damping. Among the semi-active control devices, magnetorheological dampers have the advantages of large damping force, adjustable damping force, fast response time, wide operating temperature range, and low power.

[0004] The use of existing magnetorheological dampers (MR dampers) in structures such as bridges requires continuous power support and traditionally relies on external power supplies. Although self-powered MR dampers have some development, their power generation efficiency is generally low and it is difficult to meet the power requirements of equipment and other components. Therefore, there is an urgent need for a self-powered bridge magnetorheological damper to reduce the magnetorheological damper's dependence on the mains and improve the stability of the magnetorheological damper during operation. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a self-powered bridge magnetorheological damper.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A self-powered bridge magnetorheological damper comprises a magnetorheological damper body, a plurality of metal tubes are fixed to the outer wall of the magnetorheological damper body, a plurality of piezoelectric ceramic power generation sheets are slidably connected to the inner wall of the metal tube, a copper foil sheet is arranged on the outer wall of the piezoelectric ceramic power generation sheet, a connecting plate is fixed to the outer wall of the bottom of the magnetorheological damper body, a helical gear is rotatably connected to the outer wall of the connecting plate, a plurality of arc-shaped protrusions are fixed to the outer wall of the top of the helical gear, a vibrator is slidably connected to the inner wall of the metal tube, a connecting groove is opened on the outer wall of the bottom of the vibrator, and a ball is arranged on the inner wall of the connecting groove;

[0008] A first connecting shaft is fixed to the outer wall of the metal tube, a curved rod is fixed to the outer wall of the first connecting shaft, an arc gear is fixed to the outer wall of the bottom of the curved rod, the arc gear and the helical gear are meshingly connected, a piston rod is arranged on the inner wall of the magnetorheological damper body, a fixed connecting sleeve is fixed to the outer wall of the piston rod, a push plate is fixed to the outer wall of one side of the fixed connecting sleeve, a push rod is fixed to the outer wall of the bottom of the push plate, and the outer wall of one side of the push rod is rotatably connected to the outer wall of one side of the curved rod.

[0009] Preferably, an upper connecting frame is fixed to the outer wall of the top of the piston rod, and a lower connecting frame is fixed to the outer wall of the bottom of the connecting plate.

[0010] Further: a shielding sheet is provided on the inner wall of the metal tube.

[0011] Further preferably, a plurality of reinforcement rods are fixed to the inner wall of the fixed connection sleeve, and an outer wall on one side of the reinforcement rods is fixed to the outer wall of the piston rod.

[0012] As a preferred embodiment of the present invention: a battery block is fixed on the inner wall of the push plate, and a conductive connector is provided on the outer wall of the battery block.

[0013] As a further preferred embodiment of the present invention: a connecting rod is fixed to the outer wall of the curved rod, a shielding plate is fixed to the outer wall of the connecting rod, a supporting rod is fixed to the outer wall of the bottom of the shielding plate, the supporting rod is fixed to the outer wall of one side of the lower connecting frame, and a second shielding frame is fixed to the outer wall of the shielding plate.

[0014] As a further solution of the present invention: the outer wall of the second shielding frame is respectively fixed with an annular shielding sleeve and the first shielding frame, the inner wall of the first shielding frame is provided with a group of elastic shielding sheets, and the outer wall of the elastic shielding sheet is fixed on the outer wall of one side of the curved rod.

[0015] On the basis of the above-mentioned solution: an energy storage power supply circuit board is arranged on the outer wall of the shielding plate, and the energy storage power supply circuit board is electrically connected to the battery block.

[0016] Based on the above solution, preferably: a fixing plate is fixed to the outer wall of the metal tube, the fixing plate is fixed to the outer wall of the magnetorheological damper body by screws, and a buffer pad is arranged on the outer wall of the metal tube.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention can effectively convert the low-frequency, small-amplitude vibrations generated by the bridge structure into medium-to-low-frequency, high-energy output electrical energy, thereby achieving continuous power supply to the magnetorheological damper body, avoiding the magnetorheological damper body's dependence on city electricity, and allowing the magnetorheological damper body to still have sufficient electrical energy during natural disasters such as typhoons.

[0019] 2. When the bridge shakes under the action of wind, the piston rod on the inner wall of the magnetorheological damper body will move back and forth under the tension of the upper connecting frame and the lower connecting frame, thereby driving the fixed connecting sleeve to move back and forth as a whole. When the fixed connecting sleeve moves, it will pull the push rod downward or upward through the push plate on the outer wall. When the push rod moves up and down, it will push the curved rod on one side to swing back and forth under the support of the first connecting shaft, thereby driving the bevel gear to rotate left and right as a whole through the swinging arc gear. When the bevel gear rotates, it will drive the arc-shaped protrusion on the outer wall to rotate at the same time, thereby pushing the ball and the vibrator as a whole to move up and down on the inner wall of the metal tube through the continuously moving arc-shaped protrusion. The continuous up and down movement of the vibrator will stimulate the multiple piezoelectric ceramic generators inside the metal tube to generate electricity.

[0020] 3. Electric energy can be transmitted between each piezoelectric ceramic generator through copper foil. The copper foil can separate multiple piezoelectric ceramic generators while ensuring that the electric energy generated between the multiple piezoelectric ceramic generators can flow smoothly. At the same time, the staff can connect the copper foil to the magnetorheological damper body through a fixed transmission line, so as to continuously and stably transmit the electric energy generated by the piezoelectric ceramic generator to the magnetorheological damper body.

[0021] 4. The electric energy generated by continuously squeezing the piezoelectric ceramic generator can be stored through the battery block, so that the piezoelectric ceramic generator can provide electric energy for other components of the bridge; the shielding plate, together with the first shielding frame, the second shielding frame and the annular shielding sleeve, can shield and protect the curved rod, arc gear, bevel gear and arc protrusion to prevent these structures from being excessively affected by the external environment, thereby improving the service life of the overall external structure of the magnetorheological damper body.

[0022] 5. The buffer pad can buffer multiple metal tubes close together, improve the stability of multiple metal tubes wrapped around the outer wall of the magnetorheological damper body, and at the same time, the staff can easily install and disassemble the metal tube through the fixing plate, so as to facilitate the maintenance and replacement of the metal tube and the piezoelectric ceramic generator inside the metal tube.

[0023] 6. By testing the power generation efficiency of the piezoelectric ceramic generator, the vibration of the bridge cable can be calculated. The higher the power generation efficiency, the more frequent the vibration of the bridge cable, thus enabling the overall state of the bridge to be tested from the side. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main structure of a self-powered bridge magnetorheological damper proposed by the present invention;

[0025] Figure 2 A schematic diagram of the piston rod of a self-powered bridge magnetorheological damper proposed by the present invention moving downward;

[0026] Figure 3 A schematic diagram of the helical gear structure of a self-powered bridge magnetorheological damper proposed by the present invention;

[0027] Figure 4 A schematic diagram of the internal structure of a metal tube of a self-powered bridge magnetorheological damper proposed by the present invention;

[0028] Figure 5 A schematic diagram of the oscillator structure of a self-powered bridge magnetorheological damper proposed by the present invention;

[0029] Figure 6 This is a structural schematic diagram of Example 2 of a self-powered bridge magnetorheological damper proposed by the present invention;

[0030] Figure 7 This is a schematic diagram of the fixing plate structure of a self-powered bridge magnetorheological damper proposed by the present invention.

[0031] In the figure: 1 magnetorheological damper body, 2 piston rod, 3 fixed connecting sleeve, 4 upper connecting frame, 5 push plate, 6 push rod, 7 metal tube, 8 bevel gear, 9 arc-shaped protrusion, 10 lower connecting frame, 11 arc-shaped gear, 12 curved rod, 13 first connecting shaft, 14 shielding sheet, 15 reinforcement rod, 16 ball, 17 copper foil, 18 piezoelectric ceramic power generation sheet, 19 vibrator, 20 connecting plate, 21 connecting groove, 22 support rod, 23 elastic shielding sheet, 24 first shielding frame, 25 energy storage power supply circuit board, 26 shielding plate, 27 battery block, 28 conductive joint, 29 annular shielding sleeve, 30 second shielding frame, 31 fixed sheet, 32 connecting rod, 33 buffer pad. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiment 1:

[0037] A self-powered bridge magnetorheological damper, such as Figure 1-5 As shown, it includes a magnetorheological damper body 1, a plurality of metal tubes 7 are fixed on the outer wall of the magnetorheological damper body 1, a plurality of piezoelectric ceramic power generation sheets 18 are slidably connected to the inner wall of the metal tube 7, a copper foil sheet 17 is arranged on the outer wall of the piezoelectric ceramic power generation sheet 18, a connecting plate 20 is fixed on the outer wall of the bottom of the magnetorheological damper body 1, a helical gear 8 is rotatably connected to the outer wall of the connecting plate 20, a plurality of arc-shaped protrusions 9 are fixed on the top outer wall of the helical gear 8, a vibrator 19 is slidably connected to the inner wall of the metal tube 7, a connecting groove 21 is opened on the outer wall of the bottom of the vibrator 19, and a ball 16 is arranged on the inner wall of the connecting groove 21;

[0038] The outer wall of the metal tube 7 is fixed with a first connecting shaft 13, the outer wall of the first connecting shaft 13 is fixed with a bent rod 12, the outer wall of the bottom of the bent rod 12 is fixed with an arc gear 11, the arc gear 11 is meshingly connected with the helical gear 8, the inner wall of the magnetorheological damper body 1 is provided with a piston rod 2, the outer wall of the piston rod 2 is fixed with a fixed connecting sleeve 3, the outer wall of one side of the fixed connecting sleeve 3 is fixed with a push plate 5, the outer wall of the bottom of the push plate 5 is fixed with a push rod 6, and the outer wall of one side of the push rod 6 is rotatably connected to the outer wall of one side of the bent rod 12;

[0039] An upper connecting frame 4 is fixed to the top outer wall of the piston rod 2 , and a lower connecting frame 10 is fixed to the bottom outer wall of the connecting plate 20 .

[0040] The staff connects the magnetorheological damper body 1 as a whole to the corresponding position of the bridge through the upper connecting frame 4 and the lower connecting frame 10. When the bridge shakes under the action of wind, the piston rod 2 on the inner wall of the magnetorheological damper body 1 will move forward and backward under the tension of the upper connecting frame 4 and the lower connecting frame 10, thereby driving the fixed connecting sleeve 3 to move forward and backward as a whole. When the fixed connecting sleeve 3 moves, it will pull the push rod 6 downward or upward through the push plate 5 on the outer wall. When the push rod 6 moves up and down, it will push the curved rod 12 on one side to swing back and forth under the support of the first connecting shaft 13, thereby driving the bevel gear 8 to rotate left and right as a whole through the swinging arc gear 11. When the bevel gear 8 rotates, the arc-shaped protrusion 9 on the outer wall will be driven to rotate at the same time, thereby pushing the ball 16 and the vibrator 19 to move up and down on the inner wall of the metal tube 7 as a whole through the continuously moving arc-shaped protrusion 9. The continuous up and down movement of the vibrator 19 will stimulate the multiple piezoelectric ceramic power generation sheets 18 inside the metal tube 7 to generate electricity, thereby effectively converting the low-frequency and small-amplitude vibration generated by the bridge structure into medium-low frequency and high-energy output electrical energy, realizing continuous power supply to the magnetorheological damper body 1, avoiding the magnetorheological damper body 1 from relying on the mains electricity, and allowing the magnetorheological damper body 1 to still have sufficient electricity in natural disasters such as typhoons.

[0041] Electric energy can be transmitted between each piezoelectric ceramic generator 18 through the copper foil 17. The copper foil 17 can separate multiple piezoelectric ceramic generators 18 while ensuring that the electric energy generated between the multiple piezoelectric ceramic generators 18 can flow smoothly. At the same time, the staff can connect the copper foil 17 to the magnetorheological damper body 1 through a fixed transmission line, so as to continuously and stably transmit the electric energy generated by the piezoelectric ceramic generator 18 to the magnetorheological damper body 1.

[0042] At the same time, compared with the prior art, the present invention can significantly improve the self-power generation efficiency of the magnetorheological damper body 1, solve the problem of insufficient self-power supply capacity of the magnetorheological damper body 1, and comply with the national policy orientation on environmental protection and sustainable energy development.

[0043] At the same time, by detecting the power generation efficiency of the piezoelectric ceramic power generation sheet 18, the vibration of the bridge cable can be calculated. The higher the power generation efficiency, the more frequent the vibration of the bridge cable, so that the overall state of the bridge can be detected from the side.

[0044] like Figure 1 As shown, a shielding sheet 14 is provided on the inner wall of the metal tube 7 ; the shielding sheet 14 can shield and seal the top opening of the metal tube 7 .

[0045] like Figure 2 As shown, a plurality of reinforcing rods 15 are fixed to the inner wall of the fixed connection sleeve 3 , and the outer wall of one side of the reinforcing rod 15 is fixed to the outer wall of the piston rod 2 ; the reinforcing rod 15 can improve the stability of the connection between the fixed connection sleeve 3 and the piston rod 2 .

[0046] When the present embodiment is in use, the staff connects the magnetorheological damper body 1 as a whole to the corresponding position of the bridge through the upper connecting frame 4 and the lower connecting frame 10. When the bridge shakes under the action of wind, the piston rod 2 on the inner wall of the magnetorheological damper body 1 will move forward and backward under the tension of the upper connecting frame 4 and the lower connecting frame 10, thereby driving the fixed connecting sleeve 3 to move forward and backward as a whole. When the fixed connecting sleeve 3 moves, it will pull the push rod 6 downward or upward through the push plate 5 on the outer wall. When the push rod 6 moves up and down, it will push the curved rod 12 on one side on the first connecting axis. The arc gear 11 swings back and forth under the support of the metal tube 7, thereby driving the bevel gear 8 to rotate left and right as a whole through the swinging arc gear 11. When the bevel gear 8 rotates, the arc protrusion 9 on the outer wall will be driven to rotate at the same time, thereby pushing the ball 16 and the vibrator 19 to move up and down on the inner wall of the metal tube 7 as a whole through the continuously moving arc protrusion 9. The continuous up and down movement of the vibrator 19 will stimulate the multiple piezoelectric ceramic power generation sheets 18 inside the metal tube 7 to generate electricity, thereby effectively converting the low-frequency and small-amplitude vibration generated by the bridge structure into medium-low frequency and high-energy output electrical energy.

[0047] Embodiment 2:

[0048] A self-powered bridge magnetorheological damper, such as Figure 6-7 As shown, this embodiment makes the following improvements on the basis of embodiment 1: a battery block 27 is fixed to the inner wall of the push plate 5, and a conductive connector 28 is provided on the outer wall of the battery block 27; the electric energy generated by continuously squeezing the piezoelectric ceramic power generation sheet 18 can be stored through the battery block 27, so that the piezoelectric ceramic power generation sheet 18 can provide electric energy for other components of the bridge.

[0049] A connecting rod 32 is fixed to the outer wall of the curved rod 12, a baffle plate 26 is fixed to the outer wall of the connecting rod 32, a support rod 22 is fixed to the outer wall of the bottom of the baffle plate 26, the support rod 22 is fixed to the outer wall of one side of the lower connecting frame 10, a second baffle frame 30 is fixed to the outer wall of the baffle plate 26, an annular baffle sleeve 29 and a first baffle frame 24 are respectively fixed to the outer walls of the second baffle frame 30, a group of elastic baffle sheets 23 are arranged on the inner wall of the first baffle frame 24, and the outer wall of the elastic baffle sheet 23 is fixed to the outer wall of one side of the curved rod 12; the baffle plate 26 cooperates with the first baffle frame 24, the second baffle frame 30 and the annular baffle sleeve 29 to shield and protect the curved rod 12, the arc gear 11, the bevel gear 8 and the arc protrusion 9, so as to prevent these structures from being excessively affected by the external environment, thereby improving the service life of the overall external structure of the magnetorheological damper body 1.

[0050] The outer wall of the baffle plate 26 is provided with an energy storage power supply circuit board 25, and the energy storage power supply circuit board 25 is electrically connected to the battery block 27; by providing the energy storage power supply circuit board 25, the energy storage power supply circuit board 25 can store and supply the electric energy generated by the piezoelectric ceramic power generation sheet 18 and the outer wall photovoltaic power generation equipment, thereby ensuring that the magnetorheological damper body 1 always has sufficient power supply.

[0051] A fixing plate 31 is fixed to the outer wall of the metal tube 7, and the fixing plate 31 is fixed to the outer wall of the magnetorheological damper body 1 by screws. A buffer pad 33 is arranged on the outer wall of the metal tube 7; the buffer pad 33 can buffer between multiple metal tubes 7 close together, thereby improving the stability of the multiple metal tubes 7 wound around the outer wall of the magnetorheological damper body 1. At the same time, the staff can conveniently install and disassemble the metal tube 7 through the fixing plate 31, thereby facilitating the maintenance and replacement of the metal tube 7 and the piezoelectric ceramic generator 18 inside the metal tube 7.

[0052] When this embodiment is in use, the shielding plate 26 cooperates with the first shielding frame 24, the second shielding frame 30 and the annular shielding sleeve 29 to shield and protect the curved rod 12, the arc gear 11, the bevel gear 8 and the arc protrusion 9. At the same time, the staff can easily install and disassemble the metal tube 7 through the fixing plate 31.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-powered bridge magnetorheological damper, comprising a magnetorheological damper body (1), characterized in that: The outer wall of the magnetorheological damper body (1) is fixed with a plurality of metal tubes (7), the inner wall of the metal tube (7) is slidably connected with a plurality of piezoelectric ceramic power generation sheets (18), the outer wall of the piezoelectric ceramic power generation sheet (18) is provided with a copper foil sheet (17), the bottom outer wall of the magnetorheological damper body (1) is fixed with a connecting plate (20), the outer wall of the connecting plate (20) is rotatably connected with a bevel gear (8), the top outer wall of the bevel gear (8) is fixed with a plurality of arc-shaped protrusions (9), the inner wall of the metal tube (7) is slidably connected with a vibrator (19), the bottom outer wall of the vibrator (19) is provided with a connecting groove (21), and the inner wall of the connecting groove (21) is provided with a ball (16); A first connecting shaft (13) is fixed to the outer wall of the metal tube (7), a bent rod (12) is fixed to the outer wall of the first connecting shaft (13), an arc gear (11) is fixed to the outer wall at the bottom of the bent rod (12), the arc gear (11) is meshingly connected to the helical gear (8), a piston rod (2) is arranged on the inner wall of the magnetorheological damper body (1), a fixed connecting sleeve (3) is fixed to the outer wall of the piston rod (2), a push plate (5) is fixed to the outer wall of one side of the fixed connecting sleeve (3), a push rod (6) is fixed to the outer wall at the bottom of the push plate (5), and the outer wall of one side of the push rod (6) is rotatably connected to the outer wall of one side of the bent rod (12).

2. A self-powered bridge magnetorheological damper according to claim 1, characterized in that: An upper connecting frame (4) is fixed to the top outer wall of the piston rod (2), and a lower connecting frame (10) is fixed to the bottom outer wall of the connecting plate (20).

3. A self-powered bridge magnetorheological damper according to claim 1, characterized in that: The inner wall of the metal tube (7) is provided with a shielding sheet (14).

4. A self-powered bridge magnetorheological damper according to claim 1, characterized in that: A plurality of reinforcement rods (15) are fixed to the inner wall of the fixed connection sleeve (3), and the outer wall of one side of the reinforcement rod (15) is fixed to the outer wall of the piston rod (2).

5. A self-powered bridge magnetorheological damper according to claim 1, characterized in that: A battery block (27) is fixed on the inner wall of the push plate (5), and a conductive connector (28) is provided on the outer wall of the battery block (27).

6. A self-powered bridge magnetorheological damper according to claim 1, characterized in that: A connecting rod (32) is fixed to the outer wall of the curved rod (12), a shielding plate (26) is fixed to the outer wall of the connecting rod (32), a supporting rod (22) is fixed to the bottom outer wall of the shielding plate (26), the supporting rod (22) is fixed to the outer wall of one side of the lower connecting frame (10), and a second shielding frame (30) is fixed to the outer wall of the shielding plate (26).

7. A self-powered bridge magnetorheological damper according to claim 6, characterized in that: The outer wall of the second shielding frame (30) is respectively fixed with an annular shielding sleeve (29) and the first shielding frame (24), the inner wall of the first shielding frame (24) is provided with a group of elastic shielding sheets (23), and the outer wall of the elastic shielding sheet (23) is fixed to the outer wall of one side of the curved rod (12).

8. A self-powered bridge magnetorheological damper according to claim 6, characterized in that: An energy storage power supply circuit board (25) is disposed on the outer wall of the shielding plate (26), and the energy storage power supply circuit board (25) is electrically connected to the battery block (27).

9. A self-powered bridge magnetorheological damper according to claim 3, characterized in that: A fixing plate (31) is fixed on the outer wall of the metal tube (7), and the fixing plate (31) is fixed to the outer wall of the magnetorheological damper body (1) by means of screws. A buffer pad (33) is provided on the outer wall of the metal tube (7).

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