Bridge energy-harvesting sensing device based on omnidirectional array piezoelectric ceramic and system thereof

Abstract

The application relates to the technical field of highway bridge equipment, in particular to a bridge energy-capturing sensing device based on an omnidirectional array piezoelectric ceramic and a system thereof, which comprises a rubber support, stiffened steel plates and piezoelectric sheets, a plurality of stiffened steel plates are horizontally inserted into the rubber support, a plurality of piezoelectric sheets are arranged on the two end faces of the stiffened steel plates, the piezoelectric sheets on the end faces of the stiffened steel plates are circumferentially and equidistantly arranged, the plurality of piezoelectric sheets are connected in parallel through first wires and second wires, when the piezoelectric sheets are subjected to external force, electric current is generated in the piezoelectric sheets and is transmitted to an energy-capturing sensing system, so that the health state of the bridge can be monitored.

Description

Technical Field

[0001] This invention relates to the field of highway bridge equipment technology, and in particular to a bridge energy harvesting sensing device and system based on omnidirectional array piezoelectric ceramics. Background Technology

[0002] Vehicle loads and environmental fluctuations both cause bridge vibrations, and the load on the main girder is transferred to the substructure through the bearings. Rubber bearings, including plate and pot types, are widely used in highway and railway bridges. Their main function is to bear the weight of the bridge and allow it to undergo appropriate displacement and rotation under the influence of factors such as temperature changes and vehicle loads.

[0003] However, existing technologies still have shortcomings. For example, the intelligent power supply system and method for bridge vibration, patent number 201110021763.0, includes an energy conversion device, an energy storage device, and a power management device. The system converts bridge vibration pressure into electrical energy through a vibration transmission mechanism, connecting rod, crank, and generator. Although this system can effectively collect and convert the vibration energy generated by the bridge, its complex structure may not be suitable for widespread application.

[0004] The piezoelectric energy conversion and harvesting device utilizing bridge vibration, patent number 201210200874.2, employs a piezoelectric device composed of multiple piezoelectric elements connected in parallel to convert mechanical vibration into electrical energy. However, it focuses on harvesting energy from supports rather than addressing the health and safety of the supports and the bridge structure itself, making it unsuitable for highway bridges with dispersed supports and relatively small loads.

[0005] The self-harvesting triboelectric bridge bearing health monitoring system and method for adjusting the bearing, patent number 202011618855.2, includes: a triboelectric generator, with its first and second electrodes respectively disposed on the steel plate and the bearing; a power amplifier, with its input terminal connected to the output terminal of the triboelectric generator; a vibrator, with its input terminal connected to the output terminal of the power amplifier; and an energy harvesting device disposed on the vibrator. This system utilizes a nano-triboelectric generator to collect the vibration energy of the bearing, but it is expensive and not suitable for widespread application. Summary of the Invention

[0006] This invention provides a bridge energy harvesting sensing device and system based on omnidirectional array piezoelectric ceramics to address the issues raised in the background art.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics, comprising: a rubber support, stiffening steel plates, and piezoelectric sheets. Multiple stiffening steel plates are horizontally inserted into the rubber support. Multiple piezoelectric sheets are mounted on both ends of the stiffening steel plates. The piezoelectric sheets on the end faces of the stiffening steel plates are arranged circumferentially at equal intervals. The multiple piezoelectric sheets are connected in parallel through a first wire and a second wire.

[0008] Preferably, it further includes: an upper anchor seat, a lower anchor seat, a guide tube, and a positioning post. The rubber support is coaxially arranged inside the guide tube. The top end of the guide tube is connected to the bottom surface of the upper anchor seat. The upper circular groove on the bottom surface of the upper anchor seat is inserted into the top end of the rubber support. The bottom end of the rubber support is inserted into the circular groove. The circular groove is opened on the top surface of the positioning post. The bottom surface of the positioning post is connected to the top surface of the lower anchor seat. The bottom end of the guide tube is located below the top surface of the positioning post.

[0009] Preferably, the top surface of the positioning post has an annular groove, which is located around the groove. The inner wall of the annular groove away from the rubber support has an annular retaining groove. An annular oil bladder is provided in the annular groove. A retaining ring is provided on the side wall of the annular oil bladder. The retaining ring engages with the annular retaining groove. The top end of the annular oil bladder contacts the bottom end of the pressure ring. The top end of the pressure ring is connected to the top wall of the mounting groove through a sealing spring. The mounting groove is located on the bottom surface of the mounting tube. The top surface of the mounting tube is connected to the bottom surface of the upper anchor seat. The mounting tube is located inside the guide tube.

[0010] Preferably, the top surface of the positioning post has a circumferential array of multiple cooling holes, which are located between the circular groove and the annular groove. The bottom of the cooling holes is set towards the side wall of the annular oil bladder. A heat-conducting pipe is connected to the side wall of the annular oil bladder. The heat-conducting pipe is inserted into the cooling hole. The side wall of the heat-conducting pipe is connected to the side wall of the rubber support. A cooling mechanism is provided inside the positioning post to cool the annular oil bladder.

[0011] Preferably, the cooling mechanism includes: heat dissipation fins, the sidewall of the positioning post is equipped with multiple heat dissipation fins, the positioning post has an annular heat conduction cavity, the annular heat conduction cavity is filled with nitrogen, and the annular heat conduction cavity is disposed between the sidewall of the positioning post and the sidewall of the annular groove.

[0012] Preferably, the positioning post has an installation cavity, a rotating shaft is rotatably connected to the bottom wall of the installation cavity, the side wall of the mounting plate on the rotating shaft is hinged to the ends of multiple connecting rods, the bottom surface of the mounting plate is connected to the bottom wall of the installation cavity through a reset torsion spring, the connecting rods are connected to the drive mechanism, the drive mechanism is in contact with the annular oil bladder, and the other end of the connecting rod that passes through to the outside of the positioning post is in contact with the inner wall of the guide tube.

[0013] Preferably, the driving mechanism includes: a driving rack, a rotating gear, a driven rack, and a thrust arc. The driving rack is mounted on the connecting rod. The driving rack is meshed with one side of the rotating gear. The rotating gear is rotatably mounted on the bottom wall of the mounting cavity. The other side of the rotating gear is meshed with the driven rack. The driven rack is connected to one end of the thrust arc. One end of the inner wall of the mounting cavity has a guide groove. The other end of the guide groove is connected to an annular groove. The thrust arc is slidably connected to the guide groove. The other end of the thrust arc is in contact with an annular oil bladder.

[0014] Preferably, the guide tube sidewall is equipped with multiple drive blocks, both sidewalls of which are rounded, and the drive blocks are positioned above the connecting rod.

[0015] Preferably, the bridge energy harvesting sensing system based on omnidirectional array piezoelectric ceramics is applicable to the bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics described in any of the above claims, comprising: an AC / DC amplifier circuit module, a large-capacity capacitor, a power management chip, and a lithium battery. The first wire is connected to one end of the power supply line, and the second wire is connected to the other end of the power supply line. The power supply line is plugged into the wire hole on the top surface of the upper anchor base. The AC / DC amplifier circuit module, the large-capacity capacitor, the power management chip, and the lithium battery are connected in series on the power supply line.

[0016] Preferably, it also includes an edge computing module; the edge computing module includes a wireless acquisition unit, a transmission unit, and a cloud platform. One side of the lithium battery is connected to the wireless acquisition unit via a power line, and the other side of the lithium battery is connected to the transmission unit via a second power line. The wireless acquisition unit and the transmission unit are connected in series on a signal line. One end of the signal line is connected to a first conductor, and the other end of the signal line is connected to a second conductor. The transmission unit is connected to the cloud platform via a wireless network.

[0017] The beneficial effects of this invention are as follows:

[0018] In the solution of the present invention:

[0019] 1. When the piezoelectric element is subjected to external force, a current is generated inside the piezoelectric element and transmitted to the energy harvesting sensing system to monitor the health status of the bridge;

[0020] 2. By adding stiffening steel plates and piezoelectric sheets to the original rubber bearing, the structural characteristics of the existing bearing are not changed. The construction is simple and easy to manufacture on a large industrial scale.

[0021] 3. The electrical energy generated by the piezoelectric element can not only be collected, but also monitored for the health and safety of the bearings and bridge structure itself through connection with an energy harvesting sensing system. This is suitable for situations where highway bridge bearings are dispersed and the load is relatively small.

[0022] 4. Because piezoelectric elements are made of piezoelectric ceramic materials that are resistant to high temperatures and corrosion, they are suitable for high-temperature and high-pressure production environments. Furthermore, piezoelectric ceramics are inexpensive and suitable for widespread adoption.

[0023] 5. The piezoelectric elements are arranged in an array and redundant wiring is used to prevent the entire support sensor system from failing due to damage to local wires, thereby improving the robustness of the sensing system. Attached image description:

[0024] Figure 1 This is a schematic diagram of the rubber support structure of the present invention;

[0025] Figure 2 This is a top view of the rubber support of the present invention;

[0026] Figure 3 This is a cross-sectional view of the piezoelectric element of the present invention;

[0027] Figure 4 This is a schematic diagram of the installation position of the upper anchorage of the present invention;

[0028] Figure 5 This is a partial sectional view of the upper anchorage of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged view of a portion of point A in the middle;

[0030] Figure 7 This is a schematic diagram of the installation position of the heat pipe of the present invention;

[0031] Figure 8 This is a cross-sectional view of the cooling mechanism of the present invention;

[0032] Figure 9 This is a schematic diagram of the shaft mounting position of this invention;

[0033] Figure 10 For the present invention Figure 9 A magnified view of a section at point B in the middle;

[0034] Figure 11 This is a schematic diagram of the installation position of the driven rack of the present invention.

[0035] The components include: rubber support 1, stiffening steel plate 2, piezoelectric sheet 3, upper anchor seat 4, lower anchor seat 5, guide tube 6, positioning column 7, annular oil bladder 8, retaining ring 9, pressure ring 10, mounting tube 11, heat conduction pipe 12, cooling mechanism 13, heat dissipation fins 14, annular heat conduction cavity 15, rotating shaft 16, connecting rod 17, drive mechanism 18, drive rack 19, central rotating gear 20, driven rack 23, drive block 24, second through hole 25, annular power cavity 26, power ring 27, drive rod 28, compression ring 29, hollow spring 30, balance hole 31, and thrust arc 32. Detailed Implementation

[0036] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0037] Example: Reference Figures 1-11 A bridge energy harvesting sensing device and system based on omnidirectional array piezoelectric ceramics includes: a rubber support 1, a stiffening steel plate 2, and piezoelectric sheets 3. Multiple stiffening steel plates 2 are horizontally inserted into the rubber support 1. Multiple piezoelectric sheets 3 are mounted on both ends of the stiffening steel plate 2. The piezoelectric sheets 3 on the end faces of the stiffening steel plate 2 are arranged equidistantly in a circle. The multiple piezoelectric sheets 3 are connected in parallel through a first wire and a second wire.

[0038] The principles and beneficial effects of the above scheme are as follows:

[0039] Multiple stiffening steel plates 2 are inserted into the rubber bearing 1. Multiple piezoelectric sheets 3 are bonded to both the upper and lower end faces of the stiffening steel plates 2, arranged in a circumferential array. The adhesive used for bonding can be one or more of high-performance epoxy resin, modified acrylic adhesive, special silicone rubber adhesive, polyurethane adhesive, and conductive adhesive. Each piezoelectric sheet 3 is connected in parallel with a first wire and a second wire. When the rubber bearing 1 is subjected to axial, horizontal, or torsional forces, it undergoes compression, horizontal displacement, or torsion. The corresponding piezoelectric sheet 3 is compressed or subjected to horizontal friction. When the piezoelectric sheet 3 is subjected to external force, a current is generated within it, which is transmitted to the energy harvesting sensing system to monitor the health status of the bridge. Based on the original rubber bearing 1, a stiffening steel plate 2 and a piezoelectric element 3 are added without changing the existing bearing structural characteristics. The construction is simple and easy to manufacture on a large industrial scale. The electrical energy generated by the piezoelectric element 3 can not only be collected, but also monitored for the health and safety status of the bearing and the bridge structure itself through connection with the energy harvesting sensing system. This is suitable for situations where highway bridge bearings are dispersed and have relatively small loads. Since the piezoelectric element 3 is made of piezoelectric ceramic material that is resistant to high temperature and corrosion, it is suitable for the high temperature and high pressure production environment of the bearing. Moreover, piezoelectric ceramic is inexpensive and suitable for widespread application. The piezoelectric element 3 is arranged in an array and redundant wiring is used to prevent the failure of the entire bearing sensor system due to damage to local wires, thereby improving the robustness of the sensing system.

[0040] It also includes: an upper anchor 4, a lower anchor 5, a guide tube 6, and a positioning post 7. The rubber support 1 is coaxially arranged inside the guide tube 6. The top end of the guide tube 6 is connected to the bottom surface of the upper anchor 4. The upper circular groove on the bottom surface of the upper anchor 4 is inserted into the top end of the rubber support 1. The bottom end of the rubber support 1 is inserted into the circular groove. The circular groove is opened on the top surface of the positioning post 7. The bottom surface of the positioning post 7 is connected to the top surface of the lower anchor 5. The bottom end of the guide tube 6 is located below the top surface of the positioning post 7.

[0041] The principles and beneficial effects of the above scheme are as follows:

[0042] Before installing the rubber bearing 1 between the bridge and the foundation, the operator inserts the bottom end of the rubber bearing 1 into the circular groove on the top surface of the positioning column 7, moves the upper anchor 4 so that the upper circular groove and the top end of the rubber bearing 1 are engaged, and the foundation and bridge are fixed by bolts on the upper anchor 4 and the lower anchor 5. By installing the rubber bearing 1 in the upper anchor 4 and the lower anchor 5, the wear of the rubber bearing 1 by the foundation and the bridge can be reduced. By placing the bottom end of the guide tube 6 below the top surface of the positioning column 7, the guide tube 6 can be used to protect the rubber bearing 1 from direct sunlight or weathering caused by direct contact between the rubber bearing 1 and the airflow.

[0043] The top surface of the positioning post 7 has an annular groove, which is located around the groove. The inner wall of the annular groove away from the rubber support 1 has an annular groove. An annular oil bladder 8 is provided in the annular groove. A retaining ring 9 is provided on the side wall of the annular oil bladder 8. The retaining ring 9 engages with the annular groove. The top of the annular oil bladder 8 contacts the bottom of the pressure ring 10. The top of the pressure ring 10 is connected to the top wall of the mounting groove through a sealing spring. The mounting groove is located on the bottom surface of the mounting tube 11. The top surface of the mounting tube 11 is connected to the bottom surface of the upper anchor seat 4. The mounting tube 11 is located inside the guide tube 6.

[0044] The principles and beneficial effects of the above scheme are as follows:

[0045] The retaining ring 9 engages with the annular groove, and the annular oil bladder 8 is positioned within the annular groove, improving the stability of the annular oil bladder 8 installation. The top of the annular oil bladder 8 contacts the bottom of the pressure ring 10, and the top of the pressure ring 10 is connected to the top wall of the mounting groove via a sealing spring. The mounting groove is located on the bottom surface of the mounting tube 11, and the top surface of the mounting tube 11 is connected to the bottom surface of the upper anchor seat 4. By setting the annular oil bladder 8 to contact the bottom of the pressure ring 10, the protective effect of the upper anchor seat 4 and the lower anchor seat 5 on the rubber support 1 is further improved, and when the rubber support 1 is subjected to... When subjected to axial, horizontal, or torsional forces, the annular oil bladder 8, filled with oil, can buffer the relative movement between the guide tube 6 and the positioning column 7, preventing collisions between the mechanisms after sudden force application and improving the stability of the device. When the ambient temperature is low, the volume of oil in the annular oil bladder 8 shrinks, causing the sealing spring to release its elasticity, ensuring that the pressure ring 10 is always in contact with the top of the annular oil bladder 8, thus guaranteeing that the rubber support 1 in the device is well sealed under various temperatures.

[0046] The top surface of the positioning post 7 has a circumferential array of multiple cooling holes, which are located between the circular groove and the annular groove. The bottom of the cooling holes is set towards the side wall of the annular oil bladder 8. A heat conduction pipe 12 is connected to the side wall of the annular oil bladder 8. The heat conduction pipe 12 is inserted into the cooling hole. The side wall of the heat conduction pipe 12 is connected to the side wall of the rubber support 1. A cooling mechanism 13 is provided inside the positioning post 7 to cool the annular oil bladder 8.

[0047] The principles and beneficial effects of the above scheme are as follows:

[0048] When the rubber bearing 1 is subjected to axial compression, the top surface of the pressure ring 10 contacts the top surface of the annular oil bladder 8, and the annular oil bladder 8 is compressed downwards. The oil that dissipates heat through the cooling mechanism 13 is forced into the heat conduction pipe 12. The oil absorbs the heat generated by the axial compression of the rubber bearing 1. After the horizontal pressure on the rubber bearing 1 disappears, the oil that has absorbed heat in the heat conduction pipe 12 re-enters the annular oil bladder 8 and is cooled by the cooling mechanism 13. The oil in the heat conduction pipe 12 absorbs the heat generated by the axial pressure of the rubber bearing 1, preventing the rubber bearing 1 from being in a high-temperature state for a long time. The rubber undergoes denaturation due to the operation, and the decrease in temperature reduces the rubber's fluidity. Because the fluid rubber deforms upon cooling, it causes a change in the stress on it. This change in stress leads to inaccurate voltage output from the piezoelectric element 3. Therefore, cooling the rubber support 1 with the oil inside the heat pipe 12 can prevent deformation of the rubber support 1, thereby ensuring that the energy harvesting sensing system can always obtain accurate monitoring values. The heat pipe 12 is made of silicone material, and the pipe itself has high thermal conductivity. At the same time, it can move synchronously with the rubber support 1 in all directions without being damaged.

[0049] The cooling mechanism 13 includes: heat dissipation fins 14, multiple heat dissipation fins 14 are mounted on the side wall of the positioning post 7, an annular heat conduction cavity 15 is opened in the positioning post 7, the annular heat conduction cavity 15 is filled with nitrogen gas, and the annular heat conduction cavity 15 is disposed between the side wall of the positioning post 7 and the side wall of the annular groove.

[0050] The top wall of the annular heat-conducting cavity 15 has multiple second through holes 25. The top of the second through holes 25 is connected to the annular power cavity 26. A power ring 27 is slidably connected inside the annular power cavity 26. A drive rod 28 is connected to the bottom surface of the power ring 27. The drive rod 28 is slidably sealed with the second through holes 25. The bottom end of the drive rod 28, which is placed inside the annular heat-conducting cavity 15, is connected to a compression ring 29. The power ring 27 and the bottom wall of the annular power cavity 26 are connected by a hollow spring 30. A balance hole 31 is opened in the inner wall of the annular power cavity 26. The other end of the balance hole 31 is opened on the side wall of the positioning post 7.

[0051] The principles and beneficial effects of the above scheme are as follows:

[0052] The annular heat-conducting cavity 15 is filled with nitrogen gas. Nitrogen is readily available and has high thermal conductivity, making it the preferred heat transfer medium. When the oil temperature in the annular oil bladder 8 is high, the annular heat-conducting cavity 15 absorbs the heat from the oil through nitrogen gas and dissipates it through the heat dissipation fins 14, simplifying the design of the heat dissipation device and reducing the need for a power unit. When the ambient temperature is too low, cold air enters the annular power cavity 26 through the balance hole 31. Due to the low ambient temperature, the hollow spring 30 contracts, reducing its height. The hollow spring 30 drives the power ring 27 downwards, which in turn drives the drive rod 28 and the compression ring 29 downwards. As the temperature drops, the nitrogen gas pressure decreases, facilitating compression to some extent, but it still fills the entire annular heat-conducting cavity 15. Therefore, when the compression ring 29 moves downwards, it transfers the nitrogen gas from the annular heat-conducting cavity 15 to the annular heat-conducting cavity 26. The lower part of the spring pushes the nitrogen gas, which in turn changes the relative position of the nitrogen gas with the heat dissipation fins 14 and the annular oil bladder 8. This reduces the heat dissipated by the rubber support 1 when nitrogen gas is used as a heat transfer medium, preventing the rubber of the rubber support 1 from hardening or cracking in low-temperature environments. At the same time, the heat generated by the deformation of the rubber support 1 is used to neutralize the low temperature of the outside environment, keeping the rubber support 1 working within the allowable range of the material. When the ambient temperature rises, the hollow spring 30 expands due to heat, pushing the power ring 27 upward. The power ring 27 drives the drive rod 28 to move upward, and the compression ring 29 moves upward synchronously, preventing the pressure in the annular heat conduction cavity 15 from being too high. At the same time, it increases the amount of nitrogen gas used as a heat transfer medium to dissipate the heat of the rubber support 1. The balance hole 31 can also provide a pressure relief channel for the power ring 27 in the inner annular power cavity 26, preventing the nitrogen gas in the annular heat conduction cavity 15 from failing to fill the entire annular heat conduction cavity 15 after expansion, which would lead to a decrease in cooling efficiency.

[0053] The positioning post 7 has an installation cavity. A rotating shaft 16 is rotatably connected to the bottom wall of the installation cavity. The side wall of the mounting plate on the rotating shaft 16 is hinged to the ends of multiple connecting rods 17. The bottom surface of the mounting plate is connected to the bottom wall of the installation cavity through a reset torsion spring. The connecting rods 17 are connected to the drive mechanism 18. The drive mechanism 18 is in contact with the annular oil bladder 8. The other end of the connecting rod 17 that passes through the positioning post 7 is in contact with the inner wall of the guide tube 6.

[0054] The principles and beneficial effects of the above scheme are as follows:

[0055] When the rubber support 1 is subjected to a horizontal force, the inner wall of the guide tube 6 contacts the end of a connecting rod 17. Since the other ends of multiple connecting rods 17 are hinged to the mounting plate, the multiple connecting rods 17 synchronously drive the mounting plate, which is hinged to them, to rotate counterclockwise. The reset torsion spring stores energy. When the horizontal force received by the rubber support 1 disappears, the inner wall of the guide tube 6 disengages from the end of a connecting rod 17, the mounting plate rotates clockwise, and the reset torsion spring resets. By setting a mounting plate on the rotating shaft 16, the bottom end of the mounting plate is connected to the bottom wall of the mounting cavity through the reset torsion spring. Multiple connecting rods 17 are hinged to the mounting plate. When a connecting rod 17 is pushed by the inner wall of the guide tube 6, all the connecting rods 17 move synchronously towards the center of the mounting cavity, which improves the synchronous movement capability of the device.

[0056] The drive mechanism 18 includes a drive rack 19, a central rotating gear 20, a driven rack 23, and a thrust arc 32. The drive rack 19 is mounted on the connecting rod 17. The drive rack 19 is meshed with one side of the central rotating gear 20. The central rotating gear 20 is rotatably mounted on the bottom wall of the mounting cavity. The other side of the central rotating gear 20 is meshed with the driven rack 23. The driven rack 23 is connected to one end of the thrust arc 32. One end of the inner wall of the mounting cavity has a guide groove. The other end of the guide groove is connected to an annular groove. The thrust arc 32 is slidably connected to the guide groove. The other end of the thrust arc 32 is in contact with the annular oil bladder 8.

[0057] The principles and beneficial effects of the above scheme are as follows:

[0058] When connecting rod 17 moves toward the center of the mounting cavity, it drives the drive rack 19 to move, which in turn drives the rotating gear 20 to rotate counterclockwise. The driven rack 23, which meshes with the rotating gear 20, drives the thrust arc 32 to apply pressure to the annular oil bladder 8. When connecting rod 17 moves toward the outside of the mounting cavity, it drives the drive rack 19 to rotate the rotating gear 20 clockwise, which in turn drives the driven rack 23 to move toward the center of the mounting cavity. The driven rack 23 then drives the thrust arc 32 to release the pressure on the annular oil bladder 8. When the rubber support 1 is subjected to horizontal... When the force is applied in the horizontal direction, only one side of the inner wall of the pressure ring 10 contacts the side wall at the top of the annular oil bladder 8. The mounting plate hinged to it is rotated by the connecting rod 17. The connecting rod 17 is equipped with a drive rack 19. The drive rack 19 drives the driven rack 23 to move through the central rotating gear 20. The movement of the driven rack 23 drives the thrust arc 32 to squeeze the annular oil bladder 8. When the device is subjected to a horizontal force, the annular oil bladder 8 can also supply oil to all the heat conduction pipes 12 to absorb the heat generated by the horizontal deformation of the rubber support 1, thereby improving the applicability of the device.

[0059] The guide tube 6 is equipped with a plurality of drive blocks 24 on its side wall. Both sides of the drive blocks 24 are provided with rounded corners. The drive blocks 24 are positioned above the connecting rod 17.

[0060] The principles and beneficial effects of the above scheme are as follows:

[0061] When the rubber support 1 is compressed and twisted, the drive block 24 moves downward and rotates at the same time. After contacting the connecting rod 17, it pushes the connecting rod 17 into the mounting cavity and makes the annular oil bladder 8 uniformly compressed, which further improves the device's self-adjustment capability under different working conditions.

[0062] The bridge energy harvesting sensing system based on omnidirectional array piezoelectric ceramics is applicable to the bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics described above, comprising: an AC / DC amplifier circuit module, a large-capacity capacitor, a power management chip, and a lithium battery. The first wire is connected to one end of the power supply line, and the second wire is connected to the other end of the power supply line. The power supply line is inserted into the wire hole on the top surface of the upper anchor 4. The AC / DC amplifier circuit module, the large-capacity capacitor, the power management chip, and the lithium battery are connected in series on the power supply line.

[0063] The principles and beneficial effects of the above scheme are as follows:

[0064] When the piezoelectric element 3 inside the rubber support 1 is subjected to vertical, horizontal, or torsional forces, the piezoelectric element 3 generates voltage due to deformation. At this time, the voltage is unstable. Therefore, an AC / DC amplifier circuit module is connected to the power supply line to rectify, filter, and amplify the voltage and current from the piezoelectric element 3, and stably deliver the current to the large-capacity capacitor. When the voltage on the large-capacity capacitor reaches the operating voltage of the power management chip, the power management chip starts to work. The charge in the large-capacity capacitor is charged into the lithium battery through the chip for storage. The bridge energy harvesting sensing device makes full use of the bridge's vibration, converting the vibration into electrical energy and storing it.

[0065] It also includes an edge computing module; the edge computing module includes a wireless acquisition unit, a transmission unit and a cloud platform. One side of the lithium battery is connected to the wireless acquisition unit via a power line, and the other side of the lithium battery is connected to the transmission unit via a second power line. The wireless acquisition unit and the transmission unit are connected in series on a signal line. One end of the signal line is connected to a first conductor, and the other end of the signal line is connected to a second conductor. The transmission unit is connected to the cloud platform via a wireless network.

[0066] The principles and beneficial effects of the above scheme are as follows:

[0067] The stored electrical energy is input to the wireless acquisition unit and the transmission unit through the power line and the second power line, respectively. The wireless acquisition unit collects the voltage of the piezoelectric element 3, converts it into an electrical signal and transmits it to the transmission unit. The transmission unit sends the electrical signal to the cloud platform through the wireless network. The cloud platform obtains the current status of the bridge through real-time comparison with the database, effectively utilizing the electrical energy in the system. At the same time, the health status of various parts of the bridge can be monitored in real time through the cloud platform.

[0068] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics, characterized in that, include: Rubber support (1), stiffening steel plate (2) and piezoelectric sheet (3) are provided. Multiple stiffening steel plates (2) are horizontally inserted into the rubber support (1). Multiple piezoelectric sheets (3) are installed on both ends of the stiffening steel plate (2). The piezoelectric sheets (3) on the end face of the stiffening steel plate (2) are arranged equidistantly in a circle. Multiple piezoelectric sheets (3) are connected in parallel through a first wire and a second wire. It also includes: an upper anchor (4), a lower anchor (5), a guide tube (6) and a positioning column (7). The rubber support (1) is coaxially arranged inside the guide tube (6). The top end of the guide tube (6) is connected to the bottom surface of the upper anchor (4). The upper circular groove on the bottom surface of the upper anchor (4) is inserted into the top end of the rubber support (1). The bottom end of the rubber support (1) is inserted into the circular groove. The circular groove is opened on the top surface of the positioning column (7). The bottom surface of the positioning column (7) is connected to the top surface of the lower anchor (5). The bottom end of the guide tube (6) is located below the top surface of the positioning column (7). The top surface of the positioning column (7) has an annular groove, which is located around the groove. The inner wall of the annular groove away from the rubber support (1) has an annular slot. An annular oil bladder (8) is provided in the annular groove. A retaining ring (9) is provided on the side wall of the annular oil bladder (8). The retaining ring (9) engages with the annular slot. The top of the annular oil bladder (8) contacts the bottom of the pressure ring (10). The top of the pressure ring (10) is connected to the top wall of the mounting groove through a sealing spring. The mounting groove is located on the bottom surface of the mounting tube (11). The top surface of the mounting tube (11) is connected to the bottom surface of the upper anchor (4). The mounting tube (11) is located inside the guide tube (6). The top surface of the positioning column (7) has a circumferential array of multiple cooling holes. The cooling holes are located between the circular groove and the annular groove. The bottom of the cooling holes is set towards the side wall of the annular oil bladder (8). The side wall of the annular oil bladder (8) is connected to a heat-conducting pipe (12). The heat-conducting pipe (12) is inserted into the cooling hole. The side wall of the heat-conducting pipe (12) is connected to the side wall of the rubber support (1). The positioning column (7) is equipped with a cooling mechanism (13) to cool the annular oil bladder (8).

2. The bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics according to claim 1, characterized in that, The cooling mechanism (13) includes: heat dissipation fins (14), the side wall of the positioning post (7) is equipped with multiple heat dissipation fins (14), the positioning post (7) has an annular heat conduction cavity (15) inside, the annular heat conduction cavity (15) is filled with nitrogen gas, and the annular heat conduction cavity (15) is located between the side wall of the positioning post (7) and the side wall of the annular groove.

3. The bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics according to claim 2, characterized in that, The positioning post (7) has an installation cavity. A rotating shaft (16) is rotatably connected to the bottom wall of the installation cavity. The side wall of the mounting plate on the rotating shaft (16) is hinged to the ends of multiple connecting rods (17). The bottom surface of the mounting plate is connected to the bottom wall of the installation cavity through a reset torsion spring. The connecting rods (17) are connected to the drive mechanism (18). The drive mechanism (18) is in contact with the annular oil bladder (8). The other end of the connecting rod (17) that passes through the positioning post (7) is in contact with the inner wall of the guide tube (6).

4. The bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics according to claim 3, characterized in that, The drive mechanism (18) includes: a drive rack (19), a central rotating gear (20), a driven rack (23), and a thrust arc (32). The drive rack (19) is mounted on the connecting rod (17). The drive rack (19) is meshed with one side of the central rotating gear (20). The central rotating gear (20) is rotatably mounted on the bottom wall of the mounting cavity. The other side of the central rotating gear (20) is meshed with the driven rack (23). The driven rack (23) is connected to one end of the thrust arc (32). One end of the inner wall of the mounting cavity has a guide groove. The other end of the guide groove is connected to the annular groove. The thrust arc (32) is slidably connected to the guide groove. The other end of the thrust arc (32) is in contact with the annular oil bladder (8).

5. The bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics according to claim 4, characterized in that, The guide tube (6) is equipped with multiple drive blocks (24) on its side wall. Both sides of the drive blocks (24) are provided with rounded corners. The drive blocks (24) are located above the connecting rod (17).

6. A bridge energy harvesting sensing system based on omnidirectional array piezoelectric ceramics, applicable to the bridge energy harvesting sensing device based on omnidirectional array piezoelectric ceramics as described in claim 1, characterized in that, include: The AC / DC amplifier circuit module, large-capacity capacitor, power management chip and lithium battery are connected in series. The first wire is connected to one end of the power supply line, and the second wire is connected to the other end of the power supply line. The power supply line is inserted into the wire hole on the top surface of the upper anchor (4). The AC / DC amplifier circuit module, large-capacity capacitor, power management chip and lithium battery are connected in series on the power supply line.

7. The bridge energy harvesting sensing system based on omnidirectional array piezoelectric ceramics according to claim 6, characterized in that, Also includes: Edge computing module; The edge computing module includes a wireless acquisition unit, a transmission unit, and a cloud platform. One side of the lithium battery is connected to the wireless acquisition unit via a power line, and the other side of the lithium battery is connected to the transmission unit via a second power line. The wireless acquisition unit and the transmission unit are connected in series on a signal line. One end of the signal line is connected to a first conductor, and the other end of the signal line is connected to a second conductor. The transmission unit is connected to the cloud platform via a wireless network.

Images