A hinge type TENG device based on raft type wave energy harvesting structure

Abstract

The present application belongs to the field of wave energy collection, and relates to a hinge type TENG device based on a raft type wave energy collection structure, which comprises at least two hinged wave rafts, the hinge of the wave rafts is provided with a first power generation device, the inside of at least one wave raft is provided with a second power generation device, the first power generation device is a TENG device, the first power generation device comprises oppositely arranged first and second rotating parts, different friction nano materials are respectively coated on the opposite surfaces of the first and second rotating parts, and the wave rafts drive the coaxial reverse rotation of the first and second rotating parts to generate electricity under the action of waves. The present application combines the wave raft with the TENG structure, on the one hand, can capture the marine blue energy with multiple degrees of freedom, has a high wave energy capture efficiency, on the other hand, has the self-adaptability of tidal level, can ensure the fixed draught depth of the wave raft according to the change of the tidal level, and realize the highest energy capture efficiency.

Description

Technical Field

[0001] This invention belongs to the field of wave energy harvesting and relates to a hinged TENG device based on a raft-type wave energy harvesting structure. Background Technology

[0002] Against the backdrop of the fossil fuel crisis and escalating environmental pollution, the energy industry is shifting towards cleaner and lower-carbon energy sources. Ocean wave energy holds promise as a significant energy source for alleviating the energy crisis and environmental pollution. Traditional raft-type wave energy harvesting devices connect wave rafts together via hinges to form a wave energy harvesting system. Because there is only angular displacement between the wave rafts, even in large waves, this displacement is not too large, resulting in good wind and wave resistance. However, traditional raft-type wave energy harvesting devices rely solely on the movement of the wave rafts to drive hydraulic devices to collect wave energy, leading to a low overall utilization rate of the system.

[0003] In recent years, triboelectric nanogenerator (TENG) technology has emerged as a promising new power generation technology due to its low cost, simple structure, and ease of manufacturing. Chinese literature CN116006383A proposes a buoy-shaped, double-layered wave energy triboelectric nanogenerator, comprising two power generation devices both housed within a spherical buoy. One power generation unit utilizes the aforementioned triboelectric nanogenerator technology, leveraging heave and pitch wave energy to drive both units. However, relying solely on a single buoy limits the utilization rate of wave energy. Summary of the Invention

[0004] The purpose of this invention is to provide a hinged TENG device based on a raft-type wave energy harvesting structure to solve the problem of limited wave energy utilization in existing wave energy power generation devices.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a hinged TENG device based on a raft-type wave energy harvesting structure, comprising at least two hinged wave rafts, a first power generation device provided at the hinge of the wave rafts, and a second power generation device provided inside at least one wave raft. The first power generation device is a TENG device, comprising a first rotating part and a second rotating part arranged opposite to each other, and different friction nanomaterials are coated on the opposite surfaces of the first rotating part and the second rotating part. Under the action of waves, the wave rafts rotate relative to each other around the hinge axis between the wave rafts, driving the first rotating part and the second rotating part to rotate coaxially and in opposite directions to generate electricity.

[0006] Furthermore, the two hinged wave rafts are a first wave raft and a second wave raft. The first rotating part is a first disk disposed on one side of the first wave raft, and the second rotating part is a second disk disposed on one side of the second wave raft. The first disk and the second disk are coaxial, and the rotation axes of the first disk and the second disk coincide with the hinge axis between the wave rafts. Thus, the first wave raft and the second wave raft form a double-rotating shaftless hinge structure, and the hinge axis is the virtual central axis of the double-rotating shaftless hinge structure.

[0007] Furthermore, it also includes a cylinder for limiting the double-rotating shaftless hinge structure between the first wave raft and the second wave raft. The cylinder has a first opening and a second opening on opposite sides. The first disc and the first wave raft are arranged on both sides of the first opening, and the second disc and the second wave raft are arranged on both sides of the second opening. There are multiple first discs and multiple second discs. The first discs and the second discs are arranged alternately inside the cylinder.

[0008] The angle between the first wave raft and the second wave raft is 120° to 240°.

[0009] Furthermore, it also includes a battery installed inside the wave raft. The wave raft has a first through hole. At least two first wires are provided between the battery and the first power generation device. One end of the two first wires is connected to the battery, and the other end of the two first wires passes through the first through hole and is connected to the first rotating part and the second rotating part respectively. The two first wires are in contact with the friction nanomaterial to transmit the electricity generated by the first power generation device to the battery.

[0010] Furthermore, the first power generation device is provided with a waterproof device, which includes a first support member, a second support member, and a waterproof cloth. One side of the first support member is fixedly connected to the first wave raft, and the other side protrudes from the first wave raft. One side of the second support member is fixedly connected to the second wave raft, and the other side protrudes from the second wave raft. The waterproof cloth covers the first support member and the second support member, and the edge of the waterproof cloth is sealed to the wave raft to prevent water from entering the first power generation device.

[0011] Furthermore, the second power generation device is a TENG device, which includes a guide rail and a sliding member. The sliding member is slidably connected to the guide rail, and different friction nanomaterials are coated on the opposing surfaces of the sliding member and the guide rail. When the wave raft moves under the action of waves, the sliding member slides on the guide rail under the action of gravity, thereby generating electricity from the second power generation device.

[0012] Furthermore, the guide rail is provided with at least one first sliding part, the slider is provided with at least one second sliding part, the first sliding part and the second sliding part are arranged opposite to each other, and different friction nanomaterials are respectively coated on the opposite surfaces of the first sliding part and the second sliding part.

[0013] Furthermore, the guide rail is provided with a groove, and the sliding member is provided with a roller. The roller rolls in the groove, causing the first sliding part and the second sliding part to slide relative to each other to generate electricity.

[0014] Furthermore, it also includes a battery installed inside the wave raft, a guide rail with a second wire hole located on the side of the first sliding part, a second wire between the battery and the first sliding part, one end of the second wire being connected to the battery, and the other end passing through the second wire hole and being connected to the first sliding part, and the second wire contacting the friction nanomaterial on the surface of the first sliding part, the second wire being used to transmit the electricity generated by the second power generation device to the battery.

[0015] Furthermore, the wave raft has two or more, which are arranged and connected in the transverse and / or longitudinal direction, with adjacent wave rafts hinged to each other; it also includes a third power generation device, which includes a hydraulic cylinder. One end of the hydraulic cylinder is connected to one of the two adjacent wave rafts, and the other end of the hydraulic cylinder is connected to the other of the two adjacent wave rafts. When the wave rafts rotate relative to each other around the hinge axis between the wave rafts under the action of waves, the hydraulic cylinder is extended and retracted, and the generator connected to the hydraulic cylinder is driven to generate electricity.

[0016] The beneficial effects of this invention are:

[0017] This invention hinges the wave raft to form a hinge structure, and combines the first and second power generation devices using TENG technology with the wave raft to convert wave energy into mechanical energy and then into electrical energy. It also uses a third power generation device to convert wave energy into hydraulic energy and then into electrical energy. The wave energy is generated by the push of the waves.

[0018] Furthermore, the TENG structure can collect irregular, low-frequency (<2Hz) ocean energy with high power density. Combining the wave raft with the TENG structure allows for multi-degree-of-freedom capture of ocean energy with high wave energy capture efficiency. It also features tidal adaptability, ensuring a fixed draft for the wave raft based on tidal changes, thus achieving maximum energy capture efficiency. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the second wave raft structure according to an embodiment of the present invention.

[0021] Figure 3 This is a structural schematic diagram of the second wave raft from another perspective in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the cylindrical structure according to an embodiment of the present invention.

[0023] Figure 5 This is the front view of an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the electrical connections of the second power generation device according to an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the electrical connections of the first power generation device according to an embodiment of the present invention.

[0026] Figure 8 This is a schematic diagram of a structure consisting of two or more wave rafts arranged horizontally and vertically.

[0027] Among them: 1 first wave raft, 2 second wave raft, 100 first power generation device, 110 first disc, 111 first connecting part, 120 second disc, 121 second connecting part, 130 cylinder, 131 first opening, 132 second opening, 140 sealing cover, 200 second power generation device, 210 guide rail, 211 first sliding part, 212 slide groove, 220 sliding member, 221 second sliding part, 230 roller, 300 third power generation device, 310 hydraulic cylinder, 320 hydraulic controller, 400 waterproof device, 410 first support member, 420 second support member, 430 waterproof cloth, 440 brush, 500 storage battery, 510 first wire hole, 520 second wire hole. Detailed Implementation

[0028] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0029] See Figure 1 As shown, this invention discloses a hinged TENG device based on a raft-type wave energy harvesting structure, comprising two hinged wave rafts, namely a first wave raft 1 and a second wave raft 2. A first power generation device 100 is provided at the hinge of the first wave raft 1 and the second wave raft 2. A second power generation device 200 is provided inside one of the wave rafts. In this example, the second power generation device is located on the second wave raft 2. Both the first power generation device 100 and the second power generation device 200 are TENG devices, that is, they generate electricity through TENG technology. A third power generation device 300 is also provided between the first wave raft 1 and the second wave raft 2. The third power generation device 300 generates electricity using hydraulic drive.

[0030] See Figures 1 to 4As shown, the first power generation device 100 includes a first rotating part and a second rotating part arranged opposite to each other. Different friction nanomaterials are coated on the opposing surfaces of the first rotating part and the second rotating part. Driven by wave energy, the two wave rafts rotate relative to each other around the hinge axis between the first wave raft 1 and the second wave raft 2, causing the first rotating part and the second rotating part to rotate coaxially and in opposite directions to generate electricity. Specifically, the first rotating part is a first disk 110 disposed on one side of the first wave raft 1, and the second rotating part is a second disk 120 disposed on one side of the second wave raft 2. The first disk 110 and the second disk 120 are coaxial, and the rotation axes of the first disk 110 and the second disk 120 coincide with the hinge axis between the wave rafts. A cylinder 130 is fitted over the first disk 110 and the second disk 120, and the cylinder 130 is used to restrict the direction of movement of the first wave raft 1 and the second wave raft 2. The cylinder 130 has opposing first openings 131 and second openings 132 on its side. A first disk 110 and a first wave raft 1 are positioned on either side of the first opening 131, and a second disk 120 and a second wave raft 2 are positioned on either side of the second opening 132. The opposing surfaces of the first disk 110 and the second disk 120 are coated with triboelectric nanomaterials for triboelectric power generation. The relative movement of the first disk 110 and the second disk 120 causes the nanomaterials coated on their opposing surfaces to generate electricity through triboelectricity. However, it should be noted that the nanomaterials coated on the two opposing surfaces are different; for example, one side may be coated with aluminum, and the other with polyethylene, to form positive and negative electrodes. (See reference...) Figure 4 As shown, two friction materials are distributed at 30° intervals. When the first disk 110 and the second disk 120 move under the drive of the wave raft, the two materials generate electrical energy through periodic rotation and friction. A first disk 110 and a second disk 120 rubbing against each other form a complete power generation assembly. To fully utilize wave energy and increase power generation efficiency, multiple first disks 110 and second disks 120 are provided, and they are staggered within the cylinder 130. For the same disk, the two opposing surfaces can be coated with the same power generation material or different power generation materials, as long as the materials coated on the two opposing surfaces of the same power generation assembly with relative friction are different. In this example, different materials are coated on the two surfaces of each disk.

[0031] A first connecting portion 111 is provided on one side of the first disc 110 to connect to the first wave raft 1, and a second connecting portion 121 is provided on one side of the second disc 120 to connect to the second wave raft 2. The first connecting portion 111 passes through the first opening 131, and the second connecting portion 121 passes through the second opening 132. The gap between the first opening 131 and the first connecting portion 111 is the movement space of the first wave raft 1, and the gap between the second opening 132 and the second connecting portion 121 is the movement space of the second wave raft 2. The included angle between the first wave raft 1 and the second wave raft 2 is between 120° and 240°, that is, both the first wave raft 1 and the second wave raft 2 have a vertical movement space of 60°. In this example, the central angle formed by the first opening 131 with respect to the central axis of the cylinder is no greater than 120°, and the central angle formed by the second opening 132 with respect to the central axis of the cylinder is no greater than 120°.

[0032] The first wave raft 1 and the second wave raft 2 are hinged to form a hinge structure. The first disk 110 of the first power generation device 100 is fixed relative to the first wave raft 1, and the second disk 120 is fixed relative to the second wave raft 2. That is, the first power generation device 100 utilizes the hinged first wave raft 1 and the second wave raft 2 to form a hinge structure, making full use of the relative rotation between the first wave raft 1 and the second wave raft 2, resulting in a large power generation.

[0033] See Figure 5 As shown, since the first power generation device 100 is located between the first wave raft 1 and the second wave raft 2, it will be in direct contact with seawater. To prevent water from entering the first power generation device 100, a waterproof device 400 is provided on its exterior. The waterproof device 400 includes a first support member 410, a second support member 420, and a waterproof cloth 430. One side of the first support member 410 is fixedly connected to the first wave raft 1, and the other side protrudes from the first wave raft 1. One side of the second support member 420 is fixedly connected to the second wave raft 2, and the other side protrudes from the second wave raft 2. The waterproof cloth 430 covers the first support member 410 and the second support member 420, and the edge of the waterproof cloth 430 is sealed to the wave raft to prevent water from entering the first power generation device 100. Figure 5In the illustrated embodiment, both the first support member 410 and the second support member 420 are arc-shaped plates, and the central angles of both the first support member 410 and the second support member 420 are greater than 90°, thus forming a semi-circular support outside the first power generation device 100, separating the waterproof cloth 430 from the first power generation device 100, and preventing the waterproof cloth 430 from getting stuck in the gap between the first disc 110, the second disc 120, and the cylinder 130 when the first power generation device 100 moves, thus affecting the operation of the first power generation device 100. However, there is also a gap between the first support member 410 and the second support member 420. When the first wave raft 1 and the second wave raft 2 move, they will drive the first support member 410 and the second support member 420 to move relative to each other. To prevent the waterproof cloth 430 from being rolled into the gap between the first support member 410 and the second support member 420, a brush 440 is provided between the first support member 410 and the second support member 420. The brush 440 is connected to the second support member 420 and moves with the second support member 420. In other embodiments, the first support member 410 and the second support member 420 can also be straight plates, with the two straight plates always maintaining a considerable distance to prevent the waterproof cloth 430 from getting stuck between the straight plates. However, it should be noted that, whether the plates are curved or straight, their dimensions should ensure that they do not affect the movement of the first wave raft 1 and the second wave raft 2 and always isolate the waterproof cloth 430 and the first power generation device 100.

[0034] The cylinder 130 is composed of two halves connected by threads. Therefore, sealing rings 140 are provided at both ends of the cylinder 130. The sealing rings 140 cover the outer circumferential surface of the end of the cylinder 130, preventing water from entering at the connection between the outer circumferential surfaces of the upper and lower halves of the cylinder. In addition, sealing plates are also provided at the connection surfaces of the upper and lower halves of the cylinder 130 to prevent water from entering at the connection between the end faces of the upper and lower halves of the cylinder 130. In other embodiments, the sealing rings and sealing plates at both ends of the cylinder 130 can be replaced by sealing caps, thereby completely covering the end face of the cylinder 130 to prevent water from entering.

[0035] It should be noted that the waterproof cloth 430 installed outside the first power generation device 100 can wrap around the upper and lower surfaces of the first power generation device 100 along the hinge axis of the two wave rafts, thereby also wrapping both ends of the cylinder 130 inside the waterproof cloth 430. Alternatively, the upper and lower surfaces of the first power generation device 100 can be wrapped separately, in which case at least part of both ends of the cylinder 130 will be exposed to seawater. In this case, a sealing cap should be provided at the end of the cylinder 130.

[0036] In this example, the first wave raft 1 and the second wave raft 2 form a double-rotating shaftless hinge structure via the first disk 110 and the second disk 120. The first wave raft 1 and the second wave raft 2 rotate relative to each other around the hinge point, and the hinge axis of the first wave raft 1 and the second wave raft 2 is the virtual central axis of the double-rotating shaftless hinge structure. In other embodiments, a solid rotating shaft can be inserted at the center of the first disk 110 and the second disk 120, in which case the hinge axis is a solid axis. The bidirectional rotating shaftless hinge structure described in this invention is a mechanical device used to connect two hinge pieces (in this invention, the hinge refers to a wave raft) and allow relative rotation between them. One of its features is the absence of a physical hinge shaft. Coaxial discs are machined on the side where the two hinges are connected. The discs of the two hinges are placed in an alternating manner and are fixed by an external cylinder, so that the coaxial discs can rotate bidirectionally around a virtual central axis and prevent them from shifting in other directions. Another feature is that the limiting cylinder has an opening, which allows the two hinge pieces of this bidirectional rotating shaftless hinge structure to rotate bidirectionally within a set angle.

[0037] See Figure 2 and Figure 3 As shown, the second power generation device 200 includes a guide rail 210 and a slider 220. The slider 220 is slidably connected to the guide rail 210. Different friction nanomaterials are coated on the opposing surfaces of the slider 220 and the guide rail 210. The wave raft moves under the drive of wave energy, causing the slider 220 to slide on the guide rail 210 to generate electricity. The guide rail 210 is provided with at least two first sliding portions 211, and the slider 220 is provided with at least one second sliding portion 221. The first sliding portions 211 and the second sliding portions 221 are arranged opposite to each other, and different friction nanomaterials are coated on the opposing surfaces of the first sliding portions 211 and the second sliding portions 221. The second power generation device 200 can be set in the first wave raft 1, or it can be set in the second wave raft 2, or one second power generation device 200 can be set in both the first wave raft 1 and the second wave raft 2. In this example, the second power generation device 200 is set only in the second wave raft 2.

[0038] The second wave raft 2 tilts under the action of the waves, causing the guide rail 210 to tilt as well. The sliding member 220 slides along the tilted guide rail 210 under gravity. The guide rail 210 has a groove 212, and a roller 230 is located below the sliding member 220. The roller 230 rolls in the groove 212, causing the first sliding part 211 and the second sliding part 221 to slide relative to each other, thus generating electricity. The roller creates rolling friction between the sliding member 220 and the guide rail 210, facilitating the movement of the sliding member 220 and improving power generation efficiency. Only one roller 230 and one groove 212 can be provided, or two can be provided respectively, but the number of rollers cooperating with each groove 212 should be the same. In this example, a groove 212 is provided on each side of the first sliding part 211, and a roller 230 is provided on each side of the second sliding part 221 to maintain the balance on both sides of the sliding member 220, ensuring that the surfaces of the first sliding part 211 and the second sliding part 222 maintain facing each other, thus guaranteeing power generation efficiency. During the sliding process of the slider 220, each second sliding part 222 sequentially passes through the first sliding part 211, forming a complete power generation circuit with the first sliding part 211 it has passed through. The friction nanomaterials coated on the surfaces of the first sliding part 211 and the second sliding part 221 are different. For example, the first sliding part 211 is coated with aluminum, and the second sliding part 221 is coated with polyethylene, or the first sliding part 211 is coated with polyethylene, and the second sliding part 221 is coated with aluminum.

[0039] See Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in order to recover and store the electrical energy generated by the first power generation device 100 and the second power generation device 200, a storage battery 500 is installed inside the second wave raft 2. A first wiring hole 510 is provided on the side of the second wave raft 2. At least two first wires are provided between the storage battery 500 and the first power generation device 100. One end of each first wire is connected to the storage battery 500, and the other ends of the two first wires pass through the first wiring hole 510 and are respectively connected to the first rotating part (i.e., the first disk 110) and the second rotating part (i.e., the second disk 120). The two first wires are in contact with the triboelectric nanomaterial to transmit the electricity generated by the first power generation device 100 to the storage battery. More specifically, the triboelectric generators on the opposing disk surfaces form positive and negative electrodes, respectively. One first wire is fixedly connected to the surface of the first disk 110, and the other first wire is fixedly connected to the surface of the second disk 120 opposite to the first disk 110, thereby forming a complete electrical circuit: first disk 110 surface - first wire - storage battery - other first wire - second disk 120 surface.

[0040] The guide rail 210 has a second wire hole 520, which is located on the side of the first sliding part 211. A second wire is provided between the battery 500 and the first sliding part 211. One end of the second wire is connected to the battery 500, and the other end passes through the second wire hole 520 and connects to the first sliding part 211. The second wire is in contact with the friction nanomaterial on the surface of the first sliding part 211. Each pair of adjacent first sliding parts 211 forms a complete electrical circuit, and the second wire transmits the electricity generated by the second power generation device 200 to the battery 500. It should be noted that in this example, there are three guide rails 210 and three sliders 220. The second wire hole 520 is shown only on one of the guide rails 210. Although the other guide rails 210 are not shown, they also have corresponding second wire holes 520, and the positions of the second wire holes 520 on the other guide rails 210 are consistent with the second wire hole 520 on the guide rail 210 shown in the figure.

[0041] See Figure 1 As shown, the third power generation device 300 includes a hydraulic cylinder 310 and a hydraulic controller 320. The two ends of the hydraulic cylinder 310 are connected to the first wave raft 1 and the second wave raft 2, respectively, and the connection between the hydraulic cylinder 310 and the wave rafts is rotatable. The hydraulic controller 320 includes a hydraulic motor and a generator connected to the hydraulic motor. When the wave rafts rotate relative to each other around the hinge axis between the wave rafts under the action of waves, the hydraulic cylinder 310 extends and retracts, driving the hydraulic motor to rotate, thereby generating electricity.

[0042] The preferred application scenario for this invention is at sea, but it can also be applied to rivers and lakes with rapid currents that can drive wave rafts.

[0043] In this example, there are two wave rafts. In other embodiments, the number of wave rafts may be three or more, see [reference needed]. Figure 8 As shown (this figure only shows the wave raft and the first power generation device 100). In Figure 8 In this system, all wave rafts are arranged horizontally and vertically, and the connections between adjacent wave rafts are all hinged. Each hinged joint is equipped with a first power generation device 100. In addition, all wave rafts are paired up, with a second power generation device 200 installed inside one wave raft and a hydraulic controller for a third power generation device 300 installed inside the other wave raft. The hydraulic cylinder 310 of the third power generation device 300 is located between the two wave rafts.

[0044] The present invention uses a wave raft with articulated joints to collect wave energy, and sets up a first power generation device 100, a second power generation device 200 and a third power generation device 300 to convert wave energy into electrical energy, thereby improving the utilization rate of wave energy and power generation efficiency.

[0045] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that all changes in form and detail made to the invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the protection scope of the invention.

Claims

1. A hinge-type triboelectric nanogenerator based on a raft-type wave energy harvesting structure, characterized in that, The device comprises at least two articulated wave rafts. A first power generation device is located at the articulation point of each wave raft, and a second power generation device is located inside at least one wave raft. The first power generation device is a triboelectric nano-power generation device, comprising a first rotating part and a second rotating part arranged opposite to each other. Different triboelectric nanomaterials are coated on the opposing surfaces of the first and second rotating parts. Under the action of waves, the wave rafts rotate relative to each other around the articulation axis between them, causing the first and second rotating parts to rotate coaxially and in opposite directions, thus generating electricity. The two articulated wave rafts are a first wave raft and a second wave raft. The first rotating part is a first disc located on one side of the first wave raft, and the second rotating part is a disc located on the second wave raft. The second disc on one side of the raft is coaxial with the first and second discs, and the rotation axes of the first and second discs coincide with the hinge axis between the wave rafts, thus forming a double-rotating shaftless hinge structure between the first and second wave rafts. The hinge axis is the virtual central axis of the double-rotating shaftless hinge structure. It also includes a cylinder for limiting the double-rotating shaftless hinge structure between the first and second wave rafts. The cylinder has a first opening and a second opening on its side. The first disc and the first wave raft are set on both sides of the first opening, and the second disc and the second wave raft are set on both sides of the second opening. There are multiple first discs and multiple second discs. The first discs and the second discs are arranged alternately inside the cylinder.

2. The hinge-type triboelectric nanogenerator based on a raft-type wave energy harvesting structure according to claim 1, characterized in that, The angle between the first wave raft and the second wave raft is 120° to 240°.

3. The hinge-type triboelectric nanogenerator based on a raft-type wave energy harvesting structure according to claim 1, characterized in that, It also includes a battery installed inside the wave raft. The wave raft has a first wire hole. At least two first wires are provided between the battery and the first power generation device. One end of the two first wires is connected to the battery. The other end of the two first wires passes through the first wire hole and is connected to the first rotating part and the second rotating part respectively. The two first wires are in contact with the friction nanomaterial to transmit the electricity generated by the first power generation device to the battery.

4. The hinge-type triboelectric nanogenerator based on a raft-type wave energy harvesting structure according to claim 1, characterized in that, The first power generation device is equipped with a waterproof device, which includes a first support member, a second support member, and a waterproof cloth. One side of the first support member is fixedly connected to the first wave raft, and the other side protrudes from the first wave raft. One side of the second support member is fixedly connected to the second wave raft, and the other side protrudes from the second wave raft. The waterproof cloth covers the first and second support members, and the edge of the waterproof cloth is sealed to the wave raft to prevent water from entering the first power generation device.

5. A hinged triboelectric nanogenerator based on a raft-type wave energy harvesting structure according to claim 1, characterized in that, The second power generation device is a triboelectric nano-power generation device. The second power generation device includes a guide rail and a sliding member. The sliding member is slidably connected to the guide rail. Different triboelectric nanomaterials are coated on the opposing surfaces of the sliding member and the guide rail. When the wave raft moves under the action of waves, the sliding member slides on the guide rail under the action of gravity, thereby generating electricity.

6. A hinged triboelectric nanogenerator based on a raft-type wave energy harvesting structure according to claim 5, characterized in that, The guide rail is provided with at least one first sliding part, and the slider is provided with at least one second sliding part. The first sliding part and the second sliding part are arranged opposite to each other, and different friction nanomaterials are respectively coated on the opposite surfaces of the first sliding part and the second sliding part.

7. A hinged triboelectric nanogenerator based on a raft-type wave energy harvesting structure according to claim 6, characterized in that, The guide rail is provided with a groove, and the sliding member is provided with a roller. The roller rolls in the groove, causing the first sliding part and the second sliding part to slide relative to each other to generate electricity.

8. A hinged triboelectric nanogenerator based on a raft-type wave energy harvesting structure according to claim 6, characterized in that, It also includes a battery installed inside the wave raft, a guide rail with a second wire hole located on the side of the first sliding part, a second wire between the battery and the first sliding part, one end of the second wire being connected to the battery, and the other end passing through the second wire hole and being connected to the first sliding part, and the second wire contacting the friction nanomaterial on the surface of the first sliding part, the second wire being used to transmit the electricity generated by the second power generation device to the battery.

9. A hinged triboelectric nanogenerator based on a raft-type wave energy harvesting structure according to claim 1, characterized in that, The wave rafts are two or more, arranged and connected in the transverse and / or longitudinal direction, with adjacent wave rafts hinged to each other; it also includes a third power generation device, which includes a hydraulic cylinder, one end of which is connected to one of the two adjacent wave rafts, and the other end of which is connected to the other of the two adjacent wave rafts. When the wave rafts rotate relative to each other around the hinge axis between the wave rafts under the action of waves, the hydraulic cylinder is extended and retracted, and the generator connected to the hydraulic cylinder is driven to generate electricity.

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