A multi-mode energy harvesting and power generation device for underground coal mines

Abstract

The present invention discloses a multi-mode energy harvesting and power generation device for underground coal mines, which relates to the technical field of power generation equipment. It includes an upper end cover, an upper housing, a lower housing, a vibration power generation structure, a triboelectric power generation structure, and a percussion power generation structure. The triboelectric power generation structure includes a first triboelectric power generation component and a second triboelectric power generation component, and the percussion power generation structure includes a first percussion power generation component and a second percussion power generation component. Wind enters the lower housing from the air inlet, drives the rotating structure in the lower housing to rotate, so that the first triboelectric power generation component and the second triboelectric power generation component rotate relative to each other to achieve triboelectric power generation, and the first percussion power generation component and the second percussion power generation component strike to achieve percussion power generation. The vibration caused by the wind entering the upper housing from the lower housing and the vibration in the environment enable the vibration power generation structure to achieve vibration power generation. The present invention can simultaneously collect wind energy and vibration energy, improving the utilization rate of existing energy compared with the prior art. It is a green new energy power generation system and has a wide range of applicable scenarios.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and particularly to a multi-mode energy harvesting and power generation device for underground coal mines. Background Art

[0002] "Intelligentization", "less manpower", and "energy sustainability" in underground coal mines are the new trends in the current development of underground coal mines. With the improvement of the intelligent level of coal mines, the types and quantities of underground sensors have increased sharply. Therefore, the power supply problem of various sensors is an urgent problem to be solved in the development of coal mine intelligentization. Mature existing technologies such as solar power generation, hydraulic power generation, and biomass power generation are not suitable for underground engineering environments. There is a large amount of vibration energy generated when engineering equipment works underground and wind energy inside ventilation pipes. Currently, chemical batteries or single-mode piezoelectric energy harvesters are often used to supply power to sensor devices in underground coal mines. However, the existing chemical batteries or single-mode piezoelectric energy harvesters mainly have the following problems: First, chemical batteries are difficult to replace, costly, and discarded chemical batteries are prone to causing environmental pollution; Second, the existing single-mode piezoelectric energy harvesters have weak reliability and poor stability. The breakage of a single part will cause the entire power supply system to collapse, and it is difficult for the single mode of the energy harvester to collect various energies in the environment simultaneously, resulting in low energy collection efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a multi-mode energy harvesting and power generation device for underground coal mines to solve the problems existing in the above-mentioned prior art. By integrating three power generation modes into one and setting partition areas, the three power generation modes do not affect each other, improving the stability and service life of the energy harvester; the combination of multiple modes significantly enhances the power output compared to the single power generation mode of the prior art, reducing the number of manual operations and ensuring the safety of life and production.

[0004] To achieve the above object, the present invention provides the following solution:

[0005] The present invention provides a multi-mode energy harvesting and power generation device for underground coal mines, including an upper end cover, an upper housing, a lower housing, a vibration power generation structure, a triboelectric power generation structure, and a percussion power generation structure. The upper end cover, the upper housing, and the lower housing are connected in sequence. The vibration power generation structure is located inside the upper housing, and the triboelectric power generation structure and the percussion power generation structure are both located inside the lower housing. The triboelectric power generation structure includes a first triboelectric power generation component and a second triboelectric power generation component, and the percussion power generation structure includes a first percussion power generation component and a second percussion power generation component. An air inlet is provided on the side wall of the lower housing, and air enters the lower housing through the air inlet, driving a rotating structure in the lower housing to rotate, so that the first triboelectric power generation component and the second triboelectric power generation component rotate relative to each other to achieve triboelectric power generation, and the first percussion power generation component and the second percussion power generation component strike to achieve percussion power generation. The vibration caused by the air entering the upper housing from the lower housing and the vibration in the environment enable the vibration power generation structure to achieve vibration power generation.

[0006] Preferably, the vibration power generation structure includes a plurality of vibration power generation components. Each vibration power generation component includes a vibration cantilever beam, a power generation thin film, and two blunt bodies. The power generation thin film is used to connect to a wire. The lengths of the vibration cantilever beams in each vibration power generation component increase in sequence. The upper end of the vibration cantilever beam is connected to the upper end cover, and the two blunt bodies are symmetrically arranged on both sides of the lower end of the vibration cantilever beam. The power generation thin film is arranged on one side of the vibration cantilever beam, and one end of the power generation thin film contacts one of the blunt bodies.

[0007] Preferably, a bottom plate is provided at the bottom of the upper housing. The vibration power generation structure is located above the bottom plate. A ventilation opening is provided on the bottom plate, and a fluid blocking body is provided at the ventilation opening.

[0008] Preferably, an air outlet is provided on the side wall of the lower housing. The air inlet and the air outlet are centrosymmetric, and the air inlet and the air outlet are eccentrically arranged with respect to the center line of the wind-receiving surface. Broad air inlet and outlet members are provided at both the air inlet and the air outlet. The inner end of the broad air inlet and outlet member extends into the lower housing, and the inner end of the broad air inlet and outlet member has a curvature.

[0009] Preferably, the rotating structure includes a propeller and a rotating shaft assembly. The position of the propeller corresponds to the air inlet. A wind blocking plate is provided in the lower housing. The propeller is located above the wind blocking plate. One end of the rotating shaft of the propeller is connected to the rotating shaft of the rotating shaft assembly, and the other end of the rotating shaft passes through the first through hole on the wind blocking plate and is rotatably connected to the bottom of the lower housing. The second triboelectric power generation component and the first percussion power generation component are both arranged on the rotating shaft assembly.

[0010] Preferably, the first triboelectric power generation component includes an insulating substrate, a conductive plate, and a brush. The insulating substrate is connected to the wind blocking plate. A second through hole for the rotation shaft assembly to pass through is provided on the insulating substrate. The conductive plate is disposed on the insulating substrate and is used for connecting with a wire. A plurality of the brushes are uniformly arranged along the circumference of the conductive plate.

[0011] Preferably, the second triboelectric power generation component includes a second group of plates and a third group of plates. The second group of plates is made of an insulating material, and the third group of plates is made of a conductive material. A plurality of placement grooves are uniformly formed along the circumference of the upper surface of the second group of plates. A triboelectric film is disposed in each of the placement grooves. The triboelectric film can contact the brush. The lower surface of the second group of plates is connected to the upper surface of the third group of plates. One end of the triboelectric film extends to the third group of plates. The third group of plates is connected to the shaft platform at the lower end of the rotation shaft and is used for connecting with a wire.

[0012] Preferably, each of the first impact power generation components includes an impact cantilever beam and a piezoelectric ceramic. One end of the impact cantilever beam is connected to the lower housing, and the piezoelectric ceramic is disposed at the other end of the impact cantilever beam; each of the second impact power generation components includes an impact beam and a mass block. One end of the impact beam is connected to the rotating structure, and the mass block is disposed at the other end of the impact beam. The rotating structure rotates to drive the mass block to rotate and strike the piezoelectric ceramic.

[0013] Preferably, one end of each of the impact cantilever beams is connected to the lower housing through a cantilever beam base. The piezoelectric ceramics in each of the first impact power generation components are located on the same side of the corresponding impact cantilever beam; there are two second impact power generation components, and the orientations of the mass blocks in the two second impact power generation components are opposite.

[0014] Preferably, the shaft platform is provided with a weight reduction hole.

[0015] The present invention has achieved the following technical effects compared with the prior art:

[0016] The present invention combines three power generation modes into one and sets a partition area, and the three power generation modes do not affect each other, improving the stability and service life of the energy collector; the combination of multiple modes significantly enhances the power output compared with the single power generation mode in the prior art, reducing the number of manual operations and ensuring the safety of life and production; the present invention can collect wind energy and vibration energy at the same time, improving the utilization rate of existing energy compared with the prior art. It is a green new energy power generation system and has a wide range of applicable scenarios. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic cross-sectional view of the multi-mode energy harvesting and power generation device underground in a coal mine of the present invention;

[0019] Figure 2 It is a schematic structural view of the upper end cover in the present invention;

[0020] Figure 3 It is a schematic structural view of the connection between the upper end cover, the L-shaped connecting plate, and the vibrating cantilever beam in the vibration power generation area of the present invention;

[0021] Figure 4 It is a top view of the cross-section of the fluid resistance structure in the present invention;

[0022] Figure 5 It is a schematic view of the windward surface in the present invention;

[0023] Figure 6 It is a schematic structural view of the connection between the first friction power generation component, the second group of plates, and the third group of plates in the friction power generation area of the present invention;

[0024] Figure 7 It is a schematic structural view of the first friction power generation component in the present invention;

[0025] Figure 8 It is a schematic structural view of the brush in the present invention;

[0026] Figure 9 It is a schematic structural view of the distribution and arrangement mode of the friction film on the second group of plates, as well as the connection structure between the second friction power generation group of plates and the third group of plates in the present invention;

[0027] Figure 10 It is a schematic structural view of the connection between the impact cantilever beam, the cantilever beam base, the vibration ceramic, and the impact beam in the impact power generation area of the present invention;

[0028] Figure 11 It is a schematic structural view of the impact power generation part in the present invention;

[0029] Figure 12 It is a schematic structural view of the rotating shaft in the present invention;

[0030] Figure 13 It is a schematic structural view of the bearing in the present invention;

[0031] Figure 14 It is a schematic structural view of the cantilever beam base in the present invention;

[0032] Figure 15 It is a schematic structural diagram of the wide air outlet component in the present invention;

[0033] Figure 16 It is a schematic block diagram of the energy harvesting circuit in the present invention;

[0034] Figure 17 It is a system working flow chart of the present invention.

[0035] Wherein: 1 - upper end cover; 2 - vibration power generation area; 3 - fluid resistor; 4 - wide air outlet component; 5 - wind blocking plate; 6 - triboelectric power generation area; 7 - impact power generation area; 8 - lower housing; 9 - bearing; 10 - shaft platform; 11 - rotating shaft; 12 - first connection thread; 13 - propeller; 14 - upper housing; 15 - second connection thread; 16 - first fixing screw; 17 - circuit wire hole; 18 - external thread; 19 - fixing screw hole; 20 - wall structure; 21 - second fixing screw; 22 - power generation film; 23 - blunt body; 24 - vibrating cantilever beam; 25 - L-shaped connecting plate; 26 - bottom plate; 27 - cross-section center line; 28 - third fixing screw; 29 - fourth fixing screw; 30 - fifth fixing screw; 31 - first triboelectric power generation component; 32 - second group of plates; 33 - third group of plates; 34 - insulating substrate; 35 - brush; 36 - conductive plate; 37 - triboelectric power generation film; 39 - impact type cantilever beam; 40 - mass block; 41 - impact beam; 42 - piezoelectric ceramic; 43 - cantilever beam base; 44 - shaft platform groove; 45 - shaft platform key; 46 - weight reduction hole; 47 - impact beam fixing hole; 48 - keyway; 49 - cantilever beam fixing hole; 50 - base fixing hole; 51 - wide air outlet connection hole. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] The object of the present invention is to provide a multi-mode energy harvesting and power generation device for underground coal mines to solve the problems existing in the above-mentioned prior art. By integrating three power generation modes and setting partition areas, the three power generation modes do not affect each other, improving the stability and service life of the energy collector; the combination of multiple modes significantly enhances the power output compared with the single power generation mode in the prior art, reducing the number of manual operations and ensuring the safety of life and production.

[0038] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] As Figures 1 - 17 shown: This embodiment provides a multi-mode energy harvesting and power generation device for underground coal mines, including an upper end cover 1, an upper housing 14, a lower housing 8, a vibration power generation structure, a triboelectric power generation structure, and a percussion power generation structure. The upper end cover 1, the upper housing 14, and the lower housing 8 are sequentially connected by threads. The vibration power generation structure is located in the vibration power generation area 2 inside the upper housing 14, and the triboelectric power generation structure and the percussion power generation structure are respectively located in the triboelectric power generation area 6 and the percussion power generation area 7 inside the lower housing 8. The triboelectric power generation structure includes a first triboelectric power generation component 31 and a second triboelectric power generation component, and the percussion power generation structure includes a first percussion power generation component and a second percussion power generation component. An air inlet is provided on the side wall of the lower housing 8, and air enters the lower housing 8 from the air inlet, driving the rotation structure in the lower housing 8 to rotate, so that the first triboelectric power generation component 31 and the second triboelectric power generation component rotate relative to each other to achieve triboelectric power generation, and the first percussion power generation component and the second percussion power generation component strike to achieve percussion power generation. The vibration caused by the air entering the upper housing 14 from the lower housing 8 and the vibration in the environment enable the vibration power generation structure to achieve vibration power generation.

[0040] Specifically, in this embodiment, the upper end cover 1 is provided with a circuit wire hole 17 for wires to pass through and connect to the management circuit. The lower part of the upper end cover 1 is provided with an external thread 18 for connecting to the second connection thread 15 at the upper end of the upper housing 14. The upper end cover 1 extends upward with a wall structure 20, so that an external circuit board or the like can be placed on the top of the upper end cover 1. The bottom of the upper housing 14 is provided with a bottom plate 26, and the vibration power generation structure is located above the bottom plate 26. A rectangular ventilation opening is provided at the center position of the bottom plate 26, and a fluid resistor 3 is provided at the ventilation opening. Both ends of the fluid resistor 3 are connected to the upper housing 14 by fifth fixing screws 30. The fluid resistor 3 is located at the center position of the ventilation opening, and air enters the vibration power generation area 2 from both sides of the fluid resistor 3 through the ventilation opening. The upper housing 14 is connected to the lower housing 8 by a first connection thread 12. An air outlet is provided on the side wall of the lower housing 8. The air inlet and the air outlet are centrosymmetric, and the cross-sectional center line 27 of the air inlet and the air outlet relative to the windward surface is eccentrically arranged. Under the drive of wind force, the rotation of the propeller 13 of the rotation structure does not require a large starting force, and Figure 4 from the perspective of, the propeller 13 always rotates clockwise; broad air inlet and outlet members 4 are provided at both the air inlet and the air outlet. The broad air inlet and outlet members 4 are connected to the lower housing 8 by pins through broad air inlet and outlet connection holes 51. The inner end of the broad air inlet and outlet member 4 extends into the lower housing 8, and the inner end of the broad air inlet and outlet member 4 has a curvature, which can enable the maximum positive wind force to enter the structure. The outer end of the broad air inlet and outlet member 4 extends to the center of the windward surface, which can increase the air volume in and out.

[0041] In this embodiment, the vibration power generation structure includes a plurality of vibration power generation components. Each vibration power generation component includes a vibrating cantilever beam 24, a power generation thin film 22, and two blunt bodies 23. The power generation thin film 22 is preferably an MFC power generation thin film and is used to connect to a wire. Each vibration power generation component is sequentially arrayed on the lower surface of the upper end cover 1. The lengths of the vibrating cantilever beams 24 in each vibration power generation component increase in sequence, and the length difference between adjacent vibrating cantilever beams 24 is 3 mm. The upper end of the vibrating cantilever beam 24 is connected to the L-shaped connecting plate 25 through the second fixing screw 21. The L-shaped connecting plate 25 is connected to the upper end cover 1 through the first fixing screw 16 passing through the fixing screw hole 19. The two blunt bodies 23 are respectively symmetrically arranged on both sides of the lower end of the vibrating cantilever beam 24 to keep the vibrating cantilever beam 24 symmetric during vibration. The power generation thin film 22 is arranged on one side of the vibrating cantilever beam 24, and one end of the power generation thin film 22 is in contact with the upper end of one of the blunt bodies 23. One end of the wire is connected to the power generation thin film 22, and the other end of the wire is output through the circuit wire hole 17 of the upper end cover 1 and connected to the management circuit.

[0042] In this embodiment, the rotating structure includes a propeller 13 and a rotating shaft 11 assembly. The propeller 13 is threadedly connected to the top of the rotating shaft 11 of the rotating shaft 11 assembly. The position of the propeller 13 corresponds to the air inlet. A wind blocking plate 5 is arranged in the lower housing 8. The wind blocking plate 5 is fixedly connected to the lower housing 8 through the third fixing screw 28. The wind blocking plate 5 can prevent the wind from damaging the friction power generation area 6 and the impact power generation area 7. The propeller 13 is located above the wind blocking plate 5. One end of the rotating shaft 11 of the propeller 13 and the rotating shaft 11 assembly is connected. The other end of the rotating shaft 11 passes through the first through hole on the wind blocking plate 5 and is rotatably connected to the lower housing 8 through a bearing 9 installed in the bottom groove of the lower housing 8. Specifically, the rotating shaft 11 is installed in cooperation with the keyway 48 of the bearing 9 through a shaft table key 45. The second friction power generation component and the first impact power generation component are both arranged on the rotating shaft 11 assembly.

[0043] In this embodiment, the first friction power generation component 31 includes an insulating substrate 34, a conductive plate 36, and a brush 35. The number of brushes 35 is preferably four, and the conductive plate 36 is preferably a copper plate. The upper surface of the insulating substrate 34 is bonded to the lower surface of the wind blocking plate 5. A second through hole for the rotating shaft 11 assembly to pass through is provided on the insulating substrate 34. The conductive plate 36 is bonded to the middle position of the insulating substrate 34. A plurality of brushes 35 are evenly arranged along the circumference of the conductive plate 36.

[0044] In this embodiment, the second triboelectric power generation component rotates with the rotating structure. The second triboelectric power generation component includes a second group of plates 32 and a third group of plates 33. The second group of plates 32 is made of an insulating material, preferably rubber. The third group of plates 33 is made of a conductive material. A plurality of fan-shaped placement grooves are uniformly formed on the upper surface of the second group of plates 32 along the circumferential direction of the second group of plates 32. A triboelectric thin film 37 is adhered in each placement groove. The triboelectric thin film 37 is preferably a triboelectric thin film 37 made of polytetrafluoroethylene. The upper surface of the triboelectric thin film 37 and the position of the second group of plates 32 where no placement groove is provided are located or substantially located in the same plane. The triboelectric thin film 37 can contact the brush 35. The lower surface of the second group of plates 32 is adhered to the upper surface of the third group of plates 33. One end of the triboelectric thin film 37 extends to contact the upper surface of the third group of plates 33. The lower surface of the third group of plates 33 is connected to the upper surface of the shaft platform 10 at the lower end of the rotating shaft 11 with insulating glue. The shaft platform 10 is provided with a weight reduction hole 46.

[0045] In this embodiment, during the rotation process, the four brushes 35 will simultaneously sweep across the upper surface of the triboelectric thin film 37 or the upper surface of the second group of plates 32, continuously realizing the gain and loss of electrons. One wire is connected to the conductive plate 36, and the other wire is connected to the third group of plates 33, and finally connected to the management circuit.

[0046] In this embodiment, it further includes a cantilever beam base 43. The cantilever beam base 43 is in a circular ring shape. Threaded holes are circumferentially arranged on the cantilever beam base 43. Eight connecting small plates protrude circumferentially inside the cantilever beam base 43. The cantilever beam base 43 is connected and fixed to the lower housing 8 with the fourth fixing screw 29 through the base fixing hole 50. Each first impact power generation component includes an impact cantilever beam 39 and a piezoelectric ceramic 42. One end of the impact cantilever beam 39 is connected to a connecting small plate through a fixing screw passing through the cantilever beam fixing hole 49. The piezoelectric ceramic 42 is adhered to the other end of the impact cantilever beam 39. The piezoelectric ceramics 42 in each first impact power generation component are all located on the same side of the corresponding impact cantilever beam 39. Each second impact power generation component includes an impact beam 41 and a mass block 40. One end of the impact beam 41 is located in the shaft platform groove 44 of the shaft platform 10 of the rotating structure and is connected to the shaft platform 10 through a fixing screw passing through the impact beam fixing hole 47. The mass block 40 is adhered to the other end of the impact beam 41. The rotation of the rotating structure drives the mass block 40 to rotate and strike the piezoelectric ceramic 42.

[0047] In this embodiment, the second impact power generation component is preferably two. Shaft platform grooves 44 are arranged on both sides of the shaft platform 10. The two impact beams 41 are respectively installed in the shaft platform grooves 44 on both sides. The mass blocks 40 in the two second impact power generation components face in opposite directions.

[0048] This embodiment also includes an electric energy collection circuit module. The electric energy collection circuit module is a prior art. The electric energy collection circuit module converts and integrates the electric energy output by the striking power generation area 7, the friction power generation area 6 and the vibration power generation area 2, stores the energy, and finally supplies power to the required sensors.

[0049] When in use, the bottom of the multi-mode energy collection and power generation device in the coal mine of this embodiment is installed on the coal wall, the air inlet and the air outlet are extended into the ventilation duct at the required power supply location, and the wide air outlet component 4 is aligned with the direction of the wind. On the one hand, after the wind enters the lower shell 8, a part of the wind enters the vibration power generation area 2 through the bluff body 3, blows the blunt body 23 to drive the vibration cantilever beam 24 to vibrate, so that the power generation film 22 on the vibration cantilever beam 24 generates electricity; another part of the wind blows the propeller 13 to rotate, and then the shaft 11 rotates, in the friction power generation area 6, the brush 35 rubs the friction power generation film 37 to generate electricity; in the striking power generation area 7, the rotation of the shaft 11 drives the pillow block 10 to rotate, so that the striking beam 41 strikes the piezoelectric ceramic 42 bonded to the end of the striking cantilever beam 39, thereby generating electricity. On the other hand, the vibration energy generated by the large equipment in the coal mine is transmitted to the vibration cantilever beam 24 through the coal wall, so that the array of vibration cantilever beams 24 in the vibration power generation area 2 starts to work, and the power generation film 22 generates electricity.

[0050] The present embodiment is easy to use. Even if the air inlet and the air outlet are swapped during installation, the rotating shaft 11 always rotates clockwise when viewed from above, and the propeller 13 is directly blown to rotate when driven by wind, without the need for a large starting inertia force. The outer end of the wide air outlet component 4 extends to the center of the wind receiving surface, which increases the wind force and guides the wind direction. Compared with some existing single piezoelectric modes, the length of the vibrating cantilever beam 24 in the vibration power generation area 2 is arranged in descending order of 3 mm, which broadens the resonant frequency and allows it to maintain the most efficient output efficiency when vibrated by the outside world. The distance between the blunt body 23 at the end of the vibrating cantilever beam 24 and the resistant body 3 is inconsistent, so that when the wind is Under vibration, wind forces of different intensities can all achieve a greater utilization rate; the friction power generation structure adopts four brushes 35, which increases the frequency of gaining and losing electrons during rotation and improves the output efficiency of this part; the eight friction power generation films 37 and the eight insulating parts are arranged at intervals on the circumference, which increases the rate of gaining and losing electrons and improves the output efficiency; in the striking power generation area 7, two striking beams 41 are installed on the shaft table 10, which are distributed at 180 degrees, so that while the striking efficiency is improved, the piezoelectric ceramics 42 for power generation will not be affected; the shaft table 10 is integrated with the rotating shaft 11, which is easy to install, and the shaft table 10 is provided with weight reduction holes 46 to reduce losses during operation.

[0051] This embodiment combines three power generation modes into one, sets a segmentation area, and the three power generation modes do not affect each other, improving the stability and lifespan of the energy collector; the combination of multiple modes significantly enhances the power output compared to the single power generation mode in the prior art, reduces the number of manual operations, and ensures the safety of life and production; this embodiment can collect wind energy and vibration energy simultaneously, improving the utilization rate of existing energy compared to the prior art, is a green new energy power generation system, and has a wide range of applicable scenarios.

[0052] In this specification, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, based on the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A multi-mode energy harvesting and power generation device for underground coal mines, characterized in that: It includes an upper end cover, an upper housing, a lower housing, a vibration power generation structure, a triboelectric power generation structure, and a percussion power generation structure. The upper end cover, the upper housing, and the lower housing are connected in sequence. The vibration power generation structure is located inside the upper housing. The triboelectric power generation structure and the percussion power generation structure are both located inside the lower housing. The triboelectric power generation structure includes a first triboelectric power generation component and a second triboelectric power generation component. The percussion power generation structure includes a first percussion power generation component and a second percussion power generation component. An air inlet is provided on the side wall of the lower housing. Wind enters the lower housing through the air inlet, drives the rotating structure in the lower housing to rotate, enables the first triboelectric power generation component and the second triboelectric power generation component to rotate relative to each other to achieve triboelectric power generation, enables the first percussion power generation component and the second percussion power generation component to strike to achieve percussion power generation, and the vibration caused by the wind entering the upper housing from the lower housing and the vibration in the environment enable the vibration power generation structure to achieve vibration power generation; The vibration power generation structure includes a number of vibration power generation components. Each vibration power generation component includes a vibration cantilever beam, a power generation thin film, and two blunt bodies. The power generation thin film is used to be connected to a wire. The lengths of the vibration cantilever beams in each vibration power generation component increase in sequence. The upper end of the vibration cantilever beam is connected to the upper end cover. The two blunt bodies are symmetrically arranged on both sides of the lower end of the vibration cantilever beam respectively. The power generation thin film is arranged on one side of the vibration cantilever beam, and one end of the power generation thin film is in contact with one of the blunt bodies; A bottom plate is provided at the bottom of the upper housing. The vibration power generation structure is located above the bottom plate. A ventilation opening is provided on the bottom plate, and a fluid resistance body is provided at the ventilation opening; The rotating structure includes a propeller and a rotating shaft assembly. The position of the propeller corresponds to the air inlet. A wind blocking plate is provided in the lower housing. The propeller is located above the wind blocking plate. One end of the rotating shaft of the propeller is connected to the rotating shaft of the rotating shaft assembly. The other end of the rotating shaft passes through the first through hole on the wind blocking plate and is rotatably connected to the bottom of the lower housing. The second triboelectric power generation component and the first percussion power generation component are both arranged on the rotating shaft assembly.

2. The multi-mode energy harvesting and power generation device for underground coal mines according to claim 1, characterized in that: An air outlet is provided on the side wall of the lower housing. The air inlet and the air outlet are centrosymmetric, and the air inlet and the air outlet are eccentrically arranged with respect to the center line of the windward surface. Broad air inlet and outlet members are provided at both the air inlet and the air outlet. The inner end of the broad air inlet and outlet member extends into the lower housing, and the inner end of the broad air inlet and outlet member has a curvature.

3. The multi-mode energy harvesting and power generation device for underground coal mines according to claim 1, wherein: The first triboelectric power generation component includes an insulating substrate, a conductive plate, and a brush. The insulating substrate is connected to the wind blocking plate. A second through hole for the rotating shaft assembly to pass through is provided on the insulating substrate. The conductive plate is arranged on the insulating substrate. The conductive plate is used to be connected to a wire. A number of brushes are evenly arranged along the circumference of the conductive plate.

4. The multi-mode energy harvesting and power generation device for underground coal mines according to claim 3, characterized in that: The second triboelectric power generation component includes a second group of plates and a third group of plates. The second group of plates is made of an insulating material, and the third group of plates is made of a conductive material. A plurality of placement grooves are uniformly formed on the upper surface of the second group of plates along the circumferential direction of the second group of plates. A triboelectric film is disposed in each of the placement grooves. The triboelectric film can contact the brush. The lower surface of the second group of plates is connected to the upper surface of the third group of plates. One end of the triboelectric film extends to the third group of plates. The third group of plates is connected to the shaft platform at the lower end of the rotating shaft. The third group of plates is used to be connected to a wire.

5. The multi-mode energy harvesting and power generation device for underground coal mines according to claim 1, wherein: Each of the first impact power generation components includes an impact cantilever beam and a piezoelectric ceramic. One end of the impact cantilever beam is connected to the lower housing, and the piezoelectric ceramic is disposed at the other end of the impact cantilever beam. Each of the second impact power generation components includes an impact beam and a mass block. One end of the impact beam is connected to the rotating structure, and the mass block is disposed at the other end of the impact beam. The rotating structure rotates to drive the mass block to rotate and impact the piezoelectric ceramic.

6. The multi-mode energy harvesting and power generation device for underground coal mines according to claim 5, characterized in that: One end of each of the impact cantilever beams is connected to the lower housing through a cantilever beam base. The piezoelectric ceramics in each of the first impact power generation components are located on the same side of the corresponding impact cantilever beam. There are two second impact power generation components, and the masses in the two second impact power generation components face in opposite directions.

7. The multi-mode energy harvesting and power generation device for underground coal mines according to claim 4, wherein: The shaft platform is provided with a weight reduction hole.

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