Multi-stable-state disc-type friction generator

Abstract

The invention relates to the technical field of vibration energy collection, in particular to a multistable disc type friction generator. Comprising a cylindrical shell, and a rotating body is arranged in the cylindrical shell; the rotating body comprises a center shaft fixed in the cylindrical shell, the upper end of the center shaft is rotationally connected with an upper connecting disc, the lower end of the center shaft is rotationally connected with a lower connecting disc, and two supporting blocks are arranged between the upper connecting disc and the lower connecting disc; an eccentric block is arranged on one side of the two supporting blocks and the center shaft, a supporting shaft is arranged on the other side of the two supporting blocks and the center shaft, a radial spring is connected to the supporting shaft, the other end of the radial spring is fixed to the inner wall of the cylindrical shell, and a first magnet block is fixed to the side face, away from the center shaft, of one supporting block. A plurality of second magnet blocks are sequentially arranged on the inner wall face of the cylindrical shell. Low-frequency broadband efficient vibration energy harvesting can be achieved, mechanical energy of vibration of a freight train structure is converted into electric energy, and a feasible solution is provided for the power supply problem of a railway freight train vehicle-mounted sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration energy harvesting, and in particular to a multi-stable disc-shaped friction generator. Background Art

[0002] The railway vehicle operation safety monitoring system (5T system) is a key component in building a smart railway. It enables comprehensive, intelligent early warning and monitoring of trains. However, the 5T system's sole onboard safety monitoring system (TCDS) is primarily for passenger trains. Freight trains, due to frequent changes in train formation, lack a power supply system and are unable to power onboard sensors, making it difficult to obtain real-time status data on key components. Traditional battery power supply methods are unsustainable and have high replacement and maintenance costs, and cannot fundamentally solve the power supply problem for freight train onboard sensors. Utilizing vibration energy capture to convert the mechanical energy of freight train structural vibration into electrical energy has become an ideal solution to this sensor power supply problem.

[0003] The structural vibration of freight trains is characterized by low frequency, time-varying, and high dependence on vehicle speed. To achieve efficient vibration energy capture, the energy capture system needs to maintain high energy capture efficiency at low frequencies while also adapting to the wide-band vibration characteristics of the train. Therefore, a multi-stable disc-type friction generator is urgently needed to solve the above technical problems. Summary of the Invention

[0004] The present invention aims to solve the above problems and thus provide a multi-stable disc-type friction generator that can achieve low-frequency, broadband and efficient vibration energy capture, convert the mechanical energy of freight train structural vibration into electrical energy, and thus provide a feasible solution to the power supply problem of on-board sensors of railway freight trains.

[0005] The present invention solves the above problems by adopting the following technical solutions: A multi-stable disc-type friction generator includes a cylindrical shell with a hollow interior, and a rotating body is arranged in the cylindrical shell; the rotating body includes a central shaft fixed inside the cylindrical shell, the axis of the central shaft and the center of the cylindrical shell are on the same vertical line, an upper connecting disc is rotatably connected to the upper end of the central shaft, and a lower connecting disc is rotatably connected to the lower end of the central shaft, and two support blocks are arranged between the upper connecting disc and the lower connecting disc, and the two support blocks are symmetrically arranged with the central axis as the center, an eccentric block is arranged on one side of the two support blocks and the central shaft, and an eccentric block is arranged on the other side of the two support blocks and the central shaft. A support shaft is provided on one side, and the eccentric block and the support shaft are both arranged between the upper connecting disc and the lower connecting disc. A radial spring is connected to the support shaft, and the other end of the radial spring is fixed to the inner wall of the cylindrical shell. A first magnet block is fixed on the side of one of the support blocks away from the central axis, and a plurality of second magnet blocks are arranged in sequence on the inner wall surface of the cylindrical shell. By adjusting the magnetic pole direction between the first magnet block and the second magnet block, the number of the second magnet blocks, the axial center distance between the first magnet block and the central axis, and the spacing angle between adjacent second magnet blocks, different magnetic multi-stable configurations are constructed.

[0006] Preferably, a further technical solution of the present invention is: Preferably, the cylindrical shell includes a connecting shell body, which is annular and hollow inside with upper and lower openings. An upper connecting cover plate is connected to the upper opening of the connecting shell body, and a lower connecting cover plate is connected to the lower opening of the connecting shell body; the upper connecting disc is located below the upper connecting cover plate, and the upper surface of the upper connecting disc is in contact with the lower surface of the lower connecting cover plate, and the lower connecting disc is located above the lower connecting cover plate, and the lower surface of the lower connecting disc is in contact with the upper surface of the upper connecting cover plate.

[0007] Preferably, a plurality of bolt holes are commonly provided on the upper connecting cover plate, the connecting shell body and the lower connecting cover plate, and the plurality of bolt holes pass through the upper connecting cover plate, the connecting shell body and the lower connecting cover plate from top to bottom, and are evenly arranged along the circumferential direction of the cylindrical shell, and a connecting bolt group connecting the upper connecting cover plate, the connecting shell body and the lower connecting cover plate together is installed in each bolt hole.

[0008] Preferably, a connecting groove with the same height as the radial spring is provided on the inner wall surface of the connecting shell body, the connecting groove opens toward the central axis and is connected to the bolt hole corresponding to the support shaft, and the connecting bolt group located in the bolt hole is connected to the radial spring.

[0009] Preferably, the upper surface of the upper connecting disk and the lower surface of the lower connecting disk are both covered with a conductive metal friction medium layer film with a circular array grid type structure, the lower surface of the upper connecting cover plate and the upper surface of the lower connecting cover plate are both covered with a conductive metal film with a circular array grid type structure, the conductive metal films of the upper connecting cover plate and the lower connecting cover plate are both covered with a polymer material film with a circular array grid type structure, the polymer material film on the upper connecting cover plate is in contact with the conductive metal friction medium layer film on the upper connecting disk, and the polymer material film on the lower connecting cover plate is in contact with the conductive metal friction medium layer film on the lower connecting disk.

[0010] Preferably, the outer diameters of the upper connecting disc and the lower connecting disc are both adapted to the inner diameter of the connecting shell body; two upper rectangular through holes are provided on the upper connecting disc, and two lower rectangular through holes are provided on the lower connecting disc, the two upper rectangular through holes and the two lower rectangular through holes correspond one to one, and the support blocks are installed in the corresponding upper rectangular through holes and lower rectangular through holes.

[0011] Preferably, an upper circular through hole is provided on the upper connecting disc, and a lower circular through hole is provided on the lower connecting disc, the upper circular through hole and the lower circular through hole are opposite to each other up and down, the eccentric block is cylindrical, the outer diameter of the eccentric block is adapted to the inner diameter of the upper circular through hole and the lower circular through hole, and the eccentric block is installed in the upper circular through hole and the lower circular through hole.

[0012] Preferably, two second magnet blocks are fixed on the inner wall surface of the cylindrical shell, and the first magnet block and the two second magnet blocks are attracted to each other by their opposite magnetic poles when they are close to each other, thereby constructing the monostable, bistable and tristable configuration I.

[0013] Preferably, two second magnet blocks are fixed on the inner wall surface of the cylindrical shell, and the two second magnet blocks are arranged from left to right, and the magnetic poles of the first magnet block and the two second magnet blocks that are close to each other repel each other with the same poles, thereby constructing the monostable, bistable and tristable configuration II.

[0014] Preferably, three second magnet blocks are fixed on the inner wall surface of the cylindrical shell, and the three second magnet blocks are arranged from left to right, and the magnetic poles of the first magnet block and the three second magnet blocks that are close to each other repel each other with the same poles, thereby constructing monostable, bistable and quadristable configuration III.

[0015] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: The multi-stable disc-type friction generator of the present invention includes a cylindrical shell and a rotating body, which cooperate with the cylindrical shell and the rotating body to form a disc-type torsional vibration system. The disc-type torsional vibration system constructs a multi-stable disc-type friction generator based on the principle of friction power generation; the multi-stable disc-type friction generator is different from the traditional vibration energy harvesting device. It converts translational motion into rotation and can generate large torsional vibration in a limited space, which is conducive to structural miniaturization; the multi-stable disc-type friction generator introduces nonlinear magnetic force and constructs three different multi-stable configurations through the superposition of magnetic attraction and magnetic repulsion. By adjusting the number of magnets, the direction of the magnetic poles, the spacing distance and the spacing angle, the potential energy of the disc-type torsional vibration system can be flexibly adjusted, thereby regulating the disc-type torsional vibration. The steady-state characteristics of the system broaden the response bandwidth of the multi-stable disc-type friction generator, enable the multi-stable disc-type friction generator to adapt to the low-frequency and broadband vibration environment, and improve the power generation efficiency of the multi-stable disc-type friction generator; the multi-stable disc-type friction generator adopts a circumferential array grid-type conductive metal friction medium layer film, a conductive metal film and a polymer material film that cooperate with each other. Under torsional vibration, sliding occurs between the conductive metal friction medium layer film and the polymer material film along the circumferential direction and generates electrical energy; the multi-stable disc-type friction generator can achieve low-frequency and broadband efficient vibration energy capture, convert the mechanical energy of the freight train structure vibration into electrical energy, and thus provide a feasible solution to the power supply problem of on-board sensors of railway freight trains. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the explosion of the multi-stable disc-type triboelectric generator of the present invention; Figure 2 It is a structural schematic diagram of the rotating body of the present invention; Figure 3 It is a schematic diagram of the internal structure of the rotating body of the present invention; Figure 4 It is a structural schematic diagram of the connecting disc of the present invention; Figure 5 It is a structural schematic diagram of the lower connecting cover plate of the present invention; Figure 6 This is a schematic diagram of the structure of the shell body connected to the present invention; Figure 7 is a schematic diagram of the multi-stable configuration of the present invention; Figure 8 is a schematic diagram of the output voltage frequency response characteristics of the present invention; Figure 9 It is a schematic diagram of the friction power generation principle of the present invention; Figure 10 is a schematic diagram of two sub-motors and a rectifier circuit of the present invention; In the figure: 1. Central axis; 2. Upper connecting disc; 3. Lower connecting disc; 4. Support block; 5. Eccentric block; 6. Support shaft; 7. Radial spring; 8. First magnet block; 9. Second magnet block; 10. Connecting shell; 11. Upper connecting cover plate; 12. Lower connecting cover plate; 13. Bolt hole; 14. Connecting groove; 15. Conductive metal friction medium layer film; 16. Polymer material film; 17. Upper rectangular through hole; 18. Upper circular through hole; 19. Upper jack; 20. Sub-generator. DETAILED DESCRIPTION

[0017] The following description of the embodiments will help the public better understand the present invention, but the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solutions of the present invention. Any changes to the definitions of components or technical features and / or formal rather than substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solutions of the present invention.

[0018] See also Figures 1 to 10 As shown, the technical solution of the present invention is as follows: A multi-stable disc-shaped triboelectric generator includes a hollow cylindrical shell with a rotating body disposed within the cylindrical shell. The cylindrical shell and the rotating body cooperate to form a disc-shaped torsional vibration system. The disc-shaped torsional vibration system constructs a multi-stable disc-shaped triboelectric generator based on the principle of triboelectric power generation. The cylindrical shell includes a connecting shell body 10, which is annular and hollow inside with upper and lower openings. An upper connecting cover plate 11 is connected to the upper opening of the connecting shell body 10, and a lower connecting cover plate 12 is connected to the lower opening of the connecting shell body 10. Three bolt holes 13 are commonly provided on the upper connecting cover plate 11, the connecting shell body 10, and the lower connecting cover plate 12. The three bolt holes 13 all pass through the upper connecting cover plate 11, the connecting shell body 10, and the lower connecting cover plate 12 from top to bottom, and are evenly arranged along the circumferential direction of the cylindrical shell. A connecting bolt group that connects the upper connecting cover plate 11, the connecting shell body 10, and the lower connecting cover plate 12 together is installed in each of the three bolt holes 13; The rotating body includes a central shaft 1 fixed inside the cylindrical shell, the central shaft 1 is fixed between the upper connecting cover plate 11 and the lower connecting cover plate 12, the axis of the central shaft 1 and the center of the cylindrical shell are on the same vertical line, the upper connecting disc 2 is rotatably connected to the upper end of the central shaft 1, and the lower connecting disc 3 is rotatably connected to the lower end of the central shaft 1, the outer diameters of the upper connecting disc 2 and the lower connecting disc 3 are adapted to the inner diameter of the connecting shell body 10, the upper connecting disc 2 and the lower connecting disc 3 both rotate around the central shaft 1, the upper connecting disc 2 is located below the upper connecting cover plate 11, and the upper surface of the upper connecting disc 2 is in contact with the lower surface of the lower connecting cover plate 12, and the lower connecting disc 3 is located above the lower connecting cover plate 12, and the lower surface of the lower connecting disc 3 is in contact with the upper surface of the upper connecting cover plate 11. Two upper rectangular through holes 17 are processed on the upper connecting disc 2, and two lower rectangular through holes are processed on the lower connecting disc 3. The two upper rectangular through holes 17 correspond to the two lower rectangular through holes one by one. Support blocks 4 are installed in the upper and lower corresponding upper rectangular through holes 17 and lower rectangular through holes. The two support blocks 4 are symmetrically arranged with the central axis 1 as the center. An eccentric block 5 is provided on one side of the two support blocks 4 and the central axis 1, and a support shaft 6 is provided on the other side of the two support blocks 4 and the central axis 1. An upper portion is opened on the upper connecting disc 2. The circular through hole 18 is provided on the lower connecting disc 3, and the upper circular through hole 18 and the lower circular through hole are opposite to each other. The eccentric block 5 is cylindrical, and the outer diameter of the eccentric block 5 is adapted to the inner diameter of the upper circular through hole 18 and the lower circular through hole, and the eccentric block 5 is installed in the upper circular through hole 18 and the lower circular through hole. An upper plug hole 19 is provided on the upper connecting disc 2, and a lower plug hole is provided on the lower connecting disc 3. The upper plug hole 19 and the lower plug hole are opposite to each other, and the support shaft 6 is installed in the upper plug hole 19 and the lower plug hole. A radial spring 7 is connected to the support shaft 6, and a connecting groove 14 is processed on the inner wall surface of the connecting shell 10. The connecting groove 14 It is at the same height as the radial spring 7, and the connecting groove 14 opens toward the central axis 1. The connecting groove 14 is connected to the bolt hole 13 corresponding to the support shaft 6. The connecting bolt group located in the bolt hole 13 is connected to the other end of the radial spring 7. A first magnet block 8 is fixed on the side of one of the support blocks 4 away from the central axis 1, and a plurality of second magnet blocks 9 are arranged in sequence on the inner wall surface of the cylindrical shell. By adjusting the magnetic pole direction between the first magnet block 8 and the second magnet block 9, the number of the second magnet blocks 9, the axial distance between the first magnet block 8 and the central axis 1, and the spacing angle between adjacent second magnet blocks 9, different magnetic multi-stable configurations can be constructed.

[0019] The upper surface of the upper connecting disc 2 and the lower surface of the lower connecting disc 3 are both covered with a conductive metal friction medium layer film 15 with a circumferential array grid structure. The lower surface of the upper connecting cover plate 11 and the upper surface of the lower connecting cover plate 12 are both covered with a conductive metal film with a circumferential array grid structure. The conductive metal films of the upper connecting cover plate 11 and the lower connecting cover plate 12 are both covered with a polymer material film 16 with a circumferential array grid structure. The polymer material film 16 on the upper connecting cover plate 11 and the conductive metal film on the upper connecting disc 2 are both covered with a conductive metal film 15 with a circumferential array grid structure. The conductive metal friction medium layer film 15 is in contact with each other, and the polymer material film 16 on the lower connecting cover plate 12 is in contact with the conductive metal friction medium layer film 15 on the lower connecting disc 3. Under external vibration excitation, the rotating body torsional vibrates around the central axis 1, and the polymer material film 16 on the upper connecting cover plate 11 and the lower connecting cover plate 12 and the conductive metal friction medium layer film 15 on the upper connecting disc 2 and the lower connecting disc 3 generate circumferential relative sliding. Due to the frictional electrification effect, electrical energy is generated. The specific working principle is as follows: Figure 9 As shown; In the initial state, when the polymer material film 16 on the upper connecting cover plate 11 and the lower connecting cover plate 12 contacts the conductive metal friction medium layer film 15 on the upper connecting disc 2 and the lower connecting disc 3, due to the different abilities of the polymer material film 16 and the conductive metal friction medium layer film 15 to gain or lose electrons, charge transfer occurs on the contact surface, and electrons are transferred from the conductive metal friction medium layer film 15 on the upper connecting disc 2 and the lower connecting disc 3 to the polymer material film 16 on the upper connecting cover plate 11 and the lower connecting cover plate 12, resulting in the polymer material film 16 on the upper connecting cover plate 11 and the lower connecting cover plate 12 having a net negative charge, and the conductive metal friction medium layer film 15 on the upper connecting disc 2 and the lower connecting disc 3 having a net positive charge; When the rotating body rotates, the polymer material film 16 with a circumferential array grid structure on the upper connecting cover plate 11 and the lower connecting cover plate 12 will be staggered at a certain angle with the conductive metal friction medium layer film 15 with a circumferential array grid structure on the upper connecting disc 2 and the lower connecting disc 3, resulting in a potential difference between the conductive metal friction medium layer film 15 on the upper connecting disc 2 and the lower connecting disc 3 and the polymer material film 16 on the upper connecting cover plate 11 and the lower connecting cover plate 12. The potential difference drives electrons from the upper connecting cover plate 11 to the lower connecting disc 3. The conductive metal film on the lower connecting cover plate 12 flows through the external circuit to the conductive metal friction medium layer film 15 on the upper connecting disk 2 and the lower connecting disk 3, and the current flows from the conductive metal friction medium layer film 15 on the upper connecting disk 2 and the lower connecting disk 3 to the conductive metal film on the upper connecting cover plate 11 and the lower connecting cover plate 12; similarly, when the rotating body rotates in the opposite direction, a current in the opposite direction is generated; therefore, under the external vibration excitation, the rotating body of the multi-stable disc-type friction generator generates torsional vibration, thereby generating alternating current in the external circuit; The conductive metal friction medium layer film 15 and the conductive metal film are both made of aluminum or copper as an integral part, and the polymer material film 16 is made of polytetrafluoroethylene or polyperfluoroethylene propylene as an integral part. The conductive metal film and polymer material film 16 on the upper connecting cover plate 11 and the conductive metal friction medium layer film 15 on the upper connecting disc, as well as the conductive metal film and polymer material film 16 on the lower connecting cover plate 12 and the conductive metal friction medium layer film 15 on the lower connecting disc, respectively constitute two sub-generators 20. In each sub-generator 20, the conductive metal film and the conductive metal friction medium layer film 15 act as electrodes, and the conductive metal film and the conductive metal friction medium layer film 15 are connected to wires, and the output end of the wire is connected to the rectifier circuit and then connected to the supercapacitor, that is, the electrical energy is stored in the supercapacitor, as shown in FIG. Figure 10 shown.

[0020] Two second magnet blocks 9 are fixed on the inner wall surface of the cylindrical shell, and the first magnet block 8 and the two second magnet blocks 9 are attracted by the opposite magnetic poles close to each other. By adjusting the axial distance rm between the first magnet block 8 and the central axis 1, and the spacing angle α between adjacent second magnet blocks 9, the potential energy of the disk-type torsional vibration system can be controlled, thereby constructing the monostable, bistable and tristable configurations I.

[0021] Two second magnet blocks 9 are fixed on the inner wall surface of the cylindrical shell. The two second magnet blocks 9 are arranged from left to right, and the magnetic poles of the first magnet block 8 and the two second magnet blocks 9 are close to each other and repel each other. By adjusting the axial distance rm between the first magnet block 8 and the central axis 1, and the spacing angle α between adjacent second magnet blocks 9, the potential energy of the disk-type torsional vibration system can be controlled, thereby constructing the monostable, bistable and tristable configuration II.

[0022] Three second magnet blocks 9 are fixed on the inner wall surface of the cylindrical shell. The three second magnet blocks 9 are arranged from left to right, and the magnetic poles of the first magnet block 8 and the three second magnet blocks 9 are close to each other and repel each other. By adjusting the axial distance rm between the first magnet block 8 and the central axis 1, and the spacing angle α between adjacent second magnet blocks 9, the potential energy of the disk-type torsional vibration system can be controlled, thereby constructing monostable, bistable and quadristable configurations III.

[0023] It should be noted that the multi-stable characteristics caused by the superposition of nonlinear magnetic forces can effectively broaden the bandwidth of vibration energy collection, such as Figure 8As shown in the figure, through reasonable parameter control, the multi-stable disc-type friction generator can achieve a voltage output higher than the average value in the frequency range of 6.5-9.5 Hz. Compared with the linear system that only produces high voltage output at its resonant frequency, the nonlinear disc-type torsional vibration system has significant advantages.

[0024] The multi-stable disc-type friction generator of the present invention includes a cylindrical shell and a rotating body, which cooperate with the cylindrical shell and the rotating body to form a disc-type torsional vibration system. The disc-type torsional vibration system constructs a multi-stable disc-type friction generator based on the principle of friction power generation; the multi-stable disc-type friction generator is different from the traditional vibration energy harvesting device, which converts translation into rotation and can generate large torsional vibration in a limited space, which is conducive to structural miniaturization; the multi-stable disc-type friction generator introduces nonlinear magnetic force and constructs three different multi-stable configurations through the superposition of magnetic attraction and magnetic repulsion. By adjusting the number of magnets, the direction of the magnetic poles, the spacing distance and the spacing angle, the potential energy of the disc-type torsional vibration system can be flexibly adjusted, thereby regulating the stability of the disc-type torsional vibration system. state characteristics, thereby broadening the response bandwidth of the multi-stable disc-type friction generator, making the multi-stable disc-type friction generator adapt to the low-frequency and broadband vibration environment, and improving the power generation efficiency of the multi-stable disc-type friction generator; the multi-stable disc-type friction generator adopts a circumferential array grid-type conductive metal friction medium layer film 15, a conductive metal film and a polymer material film 16 that cooperate with each other. Under torsional vibration, sliding occurs between the conductive metal friction medium layer film 15 and the polymer material film 16 along the circumferential direction and generates electrical energy; the multi-stable disc-type friction generator can achieve low-frequency and broadband efficient vibration energy capture, convert the mechanical energy of the freight train structure vibration into electrical energy, and thus provide a feasible solution to the power supply problem of on-board sensors of railway freight trains.

[0025] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of the present invention.

Claims

1. A multi-stable disc-type triboelectric generator, characterized by: The invention comprises a cylindrical shell with a hollow interior, in which a rotating body is arranged; the rotating body comprises a central shaft fixed inside the cylindrical shell, the axis of the central shaft and the center of the cylindrical shell are on the same vertical line, an upper connecting disc is rotatably connected to the upper end of the central shaft, and a lower connecting disc is rotatably connected to the lower end of the central shaft, two supporting blocks are arranged between the upper connecting disc and the lower connecting disc, and the two supporting blocks are symmetrically arranged with the central shaft as the center, an eccentric block is arranged on one side of the two supporting blocks and the central shaft, and a supporting block is arranged on the other side of the two supporting blocks and the central shaft. The shaft, eccentric block and support shaft are all arranged between the upper connecting disc and the lower connecting disc. A radial spring is connected to the support shaft, and the other end of the radial spring is fixed to the inner wall of the cylindrical shell. A first magnet block is fixed on the side of one of the support blocks away from the central axis, and a plurality of second magnet blocks are arranged in sequence on the inner wall surface of the cylindrical shell. By adjusting the magnetic pole direction between the first magnet block and the second magnet block, the number of the second magnet blocks, the axial center distance between the first magnet block and the central axis, and the spacing angle between adjacent second magnet blocks, different magnetic multi-stable configurations are constructed.

2. The multistable disc-type triboelectric generator according to claim 1, characterized in that: The cylindrical shell includes a connecting shell body, which is annular and hollow inside with upper and lower openings. The upper opening of the connecting shell body is connected to an upper connecting cover plate, and the lower opening of the connecting shell body is connected to a lower connecting cover plate; the upper connecting disc is located below the upper connecting cover plate, and the upper surface of the upper connecting disc is in contact with the lower surface of the lower connecting cover plate; the lower connecting disc is located above the lower connecting cover plate, and the lower surface of the lower connecting disc is in contact with the upper surface of the upper connecting cover plate.

3. The multi-stable disc-type triboelectric generator according to claim 2, characterized in that: A plurality of bolt holes are commonly provided on the upper connecting cover plate, the connecting shell body and the lower connecting cover plate. The plurality of bolt holes pass through the upper connecting cover plate, the connecting shell body and the lower connecting cover plate from top to bottom and are evenly arranged along the circumferential direction of the cylindrical shell. A connecting bolt group connecting the upper connecting cover plate, the connecting shell body and the lower connecting cover plate is installed in each bolt hole.

4. The multi-stable disc-type triboelectric generator according to claim 3, characterized in that: A connecting groove with the same height as the radial spring is provided on the inner wall surface of the connecting shell body. The connecting groove opens toward the central axis and is connected to the bolt hole corresponding to the support shaft. The connecting bolt group located in the bolt hole is connected to the radial spring.

5. The multi-stable disc-type triboelectric generator according to claim 4, characterized in that: The upper surface of the upper connecting disc and the lower surface of the lower connecting disc are both covered with a conductive metal friction medium layer film with a circular array grid structure, the lower surface of the upper connecting cover plate and the upper surface of the lower connecting cover plate are both covered with a conductive metal film with a circular array grid structure, the conductive metal films of the upper connecting cover plate and the lower connecting cover plate are both covered with a polymer material film with a circular array grid structure, the polymer material film on the upper connecting cover plate is in contact with the conductive metal friction medium layer film on the upper connecting disc, and the polymer material film on the lower connecting cover plate is in contact with the conductive metal friction medium layer film on the lower connecting disc.

6. The multi-stable disc-type triboelectric generator according to claim 5, characterized in that: The outer diameters of the upper connecting disc and the lower connecting disc are both adapted to the inner diameter of the connecting shell body; two upper rectangular through holes are provided on the upper connecting disc, and two lower rectangular through holes are provided on the lower connecting disc, and the two upper rectangular through holes and the two lower rectangular through holes correspond one to one, and the support blocks are installed in the corresponding upper rectangular through holes and lower rectangular through holes.

7. The multi-stable disc-type triboelectric generator according to claim 6, characterized in that: An upper circular through hole is provided on the upper connecting disc, and a lower circular through hole is provided on the lower connecting disc. The upper circular through hole and the lower circular through hole are opposite to each other up and down. The eccentric block is cylindrical. The outer diameter of the eccentric block is adapted to the inner diameter of the upper circular through hole and the lower circular through hole, and the eccentric block is installed in the upper circular through hole and the lower circular through hole.

8. The multi-stable disc-type triboelectric generator according to claim 7, characterized in that: Two second magnet blocks are fixed on the inner wall surface of the cylindrical shell, and the first magnet block and the two second magnet blocks are attracted to each other by their opposite magnetic poles when they are close to each other, thereby constructing the monostable, bistable and tristable configuration I.

9. The multi-stable disc-type triboelectric generator according to claim 7, characterized in that: Two second magnet blocks are fixed on the inner wall surface of the cylindrical shell. The two second magnet blocks are arranged from left to right, and the magnetic poles of the first magnet block and the two second magnet blocks that are close to each other repel each other with the same polarity, thereby constructing the monostable, bistable and tristable configuration II.

10. The multi-stable disc-type triboelectric generator according to claim 7, characterized in that: Three second magnet blocks are fixed on the inner wall surface of the cylindrical shell. The three second magnet blocks are arranged from left to right, and the magnetic poles of the first magnet block and the three second magnet blocks that are close to each other repel each other with the same polarity, thereby constructing the monostable, bistable and quadristable configuration III.

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