TWI827399B - Automatic angle-adjustment generator - Google Patents

Abstract

An automatic angle-adjustment generator comprises a supporting mechanism, a two-degree-of-freedom magnetic coupling, an automatic angle-adjustment mechanism, a kinetic-energy-input component and an electrical-energy-generating module. The two-degree-of-freedom magnetic coupling is mounted in the supporting mechanism. An outer magnetic shaft of the two-degree-of-freedom magnetic coupling is disposed at an outer side of a spherical-surface supporting portion of the supporting mechanism. An inner magnetic shaft of the two-degree-of-freedom magnetic coupling is disposed at an inner side of the spherical-surface supporting portion. The outer magnetic shaft and the inner magnetic shaft are coupled by magnetic force and are able to spin together. The kinetic-energy-input component is disposed at an outer side of the supporting mechanism and is connected to the outer magnetic shaft. The automatic angle-adjustment mechanism is rotatably mounted inside the supporting mechanism and bears the electrical-energy-generating module connected to the inner magnetic shaft. Due to the aforementioned structure, when an input angle of kinetic energy exerted on the kinetic-energy-input component changes, by deflections of the two-degree-of-freedom magnetic coupling, the automatic angle-adjustment mechanism’s center of gravity is changed, therefore the automatic angle-adjustment mechanism adjusts its angle automatically, so that external kinetic energy is efficiently inputted to the electrical-energy-generating module to be converted to electrical energy.

Description

Power generation device with automatic angle adjustment function

The present invention relates to a power generation device that can convert fluid energy such as wind energy or other kinetic energy into electrical energy. In particular, it relates to a power generation device that can automatically adjust in response to changes in the angle of kinetic energy input to effectively convert kinetic energy into electrical energy.

Wind energy generates less pollution during the power generation process than other green energy sources, and can achieve almost zero carbon emissions, making it the "cleanest energy". Due to the rising awareness of environmental protection nowadays, in addition to large-scale offshore wind power generation, how to integrate wind power into people's lives is also an important issue for auxiliary power generation and economic development.

The current structure of a small wind energy power generation device includes a power generation module, a rotor, and a transmission mechanism connected between the rotor and the power generation module. The aforementioned wind energy power generation device has the advantages of simple structure, low cost, high mobility, and is suitable for Turbulent wind field...and many other advantages. However, existing small-scale wind energy power generation devices adopt a single axial input kinetic energy mechanism, which is more troublesome to install. If not installed correctly, the efficiency of capturing wind energy will be greatly reduced. Therefore, in actual use, it is difficult for existing small wind energy power generation devices to adjust to a better position in response to external wind energy input from different angles, resulting in poor conversion efficiency when existing wind energy power generation devices convert wind energy into electrical energy. problem.

Therefore, when studying the miniaturization of wind energy power generation devices, how to capture kinetic energy at different angles, and how to respond to changes in the angle between the rotor and the wind, and effectively store its electrical energy, provide a basis for the current development of wind energy power generation technology. one of the important research topics.

The purpose of the present invention is to provide a power generation device with an automatic angle adjustment function to solve the problem that the existing power generation device adopts a fixed single axial input kinetic energy and is difficult to adjust to a better position in response to external kinetic energy input from multiple directions at any angle, resulting in A technical problem caused by the inefficiency of power generation devices in converting external kinetic energy into electrical energy.

In order to achieve the aforementioned objectives, the power generation device with automatic angle adjustment function proposed by the present invention includes: A support mechanism, which includes a support body, the support body defines a central axis, and the support body includes a spherical curved surface support part; A dual-degree-of-freedom magnetic coupling mechanism is installed on the support body of the support mechanism. The dual-degree-of-freedom magnetic coupling mechanism includes an outer magnetic axis and an inner magnetic axis. The outer magnetic axis and the inner magnetic axis are respectively located at The outer and inner sides of the spherical curved surface support part of the support body, the outer magnetic axis and the inner magnetic axis can rotate together through the magnetic coupling of the spherical curved surface support part, and the two-degree-of-freedom magnetic coupling The mechanism can move on the spherical curved surface support part of the support mechanism to change its position; An automatic angle adjustment mechanism is rotatably installed in the support mechanism and connected to the inner magnetic axis. The automatic angle adjustment mechanism defines a first axial direction and a second axial direction that are orthogonal to each other, and includes a A movable ring and a movable carrier. The movable ring is pivoted in the support body along the first axial direction. The movable carrier is pivoted in the movable ring along the second axial direction. The movable carrier can be moved by The center of gravity automatically adjusts the angle in the support mechanism; A kinetic energy input component located outside the support body and connected to the external magnetic axis of the dual-degree-of-freedom magnetic coupling mechanism. The kinetic energy input component can receive an external kinetic energy and input the kinetic energy into the dual-degree-of-freedom magnetic coupling mechanism. ;as well as An electric energy generation module is installed in the movable carrier located in the support body. The electric energy generation module is connected to the inner magnetic axis and can receive the kinetic energy and convert it into electric energy.

Through the aforementioned invention of the power generation device with automatic angle adjustment function, it has at least the following technical effects: 1. It has the motion function of transmitting two degrees of freedom at the same time: the present invention uses a dual-degree-of-freedom magnetic coupling mechanism to connect between the kinetic energy input component and the electric energy generation module. The dual-degree-of-freedom magnetic coupling mechanism can transmit two degrees of freedom. The degree of freedom of movement makes it suitable for turbulent wind fields and can change in response to different kinetic energy input angles. 2. It has the function of automatically adjusting the installation angle: the present invention utilizes the automatic angle adjustment mechanism provided in the support mechanism to carry the electric energy generation module, and can combine the dual-degree-of-freedom magnetic coupling to connect the kinetic energy input component. Among them, the automatic angle is used The adjustment mechanism has two mutually orthogonal axial rotation mechanisms combined with the center of gravity principle, so that it can automatically adjust the angle by utilizing changes in the center of gravity, and then combines with the dual-degree-of-freedom magnetic coupling mechanism to transmit the motion function of the two degrees of freedom, making this system The power generation device of the invention can automatically adjust to a better position in response to external kinetic energy input from multiple directions at any angle, thereby improving the efficiency of the power generation device of the invention in converting external kinetic energy into electrical energy. 3. The modular mechanism is easy to disassemble, transport and replace different power input components: the present invention adopts a modular dual-degree-of-freedom magnetic coupling mechanism with an automatic angle adjustment mechanism to connect the power input components and the electric energy generation module. Between the groups, the combined structure of the modular mechanism and the dual-degree-of-freedom magnetic coupling mechanism utilize the characteristics of the magnetic coupling, which will make the installation method of the power input components not only easy to disassemble and carry, but also has the advantages of Convenience of replacing different power input modules. 4. The simplified mechanism is suitable for miniaturization: Based on the above, the present invention adopts a modular dual-degree-of-freedom magnetic coupling mechanism with an automatic angle adjustment mechanism, which is connected between the power input component and the electric energy generation module. The simplified combination structure of this modular mechanism makes the power generation device of the present invention suitable for miniaturization and can be applied in people's lives.

In the power generation device with automatic angle adjustment function of the present invention, the support body can be further used to form a sealed hollow body, so that the automatic angle adjustment mechanism equipped with the electric energy generation module and its connected internal magnetic shaft and other mechanisms can be sealed The assembly is installed inside the support body, using the support body to provide waterproof and dustproof functions, reducing the adhesion or interference of water vapor and dust that affects the normal operation of the electric energy generation module, and increasing the applicability and service life of the power generation device.

In the power generation device with automatic angle adjustment function of the present invention, the curved surface support member can further be used to include a support seat and a plurality of rolling elements. The support seat is located outside the spherical curved surface support part, and the outer magnetic axis is connected to the outer magnetic axis. The shaft part is combined with a bearing and is pivotally installed in the support seat. The plurality of rolling elements are installed on the support seat and ring around the periphery of the outer magnetic shaft. The plurality of rolling elements can rollingly contact the outer surface of the spherical curved surface support part. side, so as to reduce the frictional resistance between the curved surface support member and the spherical curved surface support part, and provide auxiliary support force to the external magnetic shaft through the curved surface support member, and make the external magnetic shaft and the outer surface of the spherical curved surface support part contact each other. There is a distance between them, and the outer magnetic axis does not contact the spherical curved surface support part. The two-degree-of-freedom magnetic coupling mechanism connected to the kinetic energy input component can reduce resistance and move smoothly when the spherical curved surface support part of the support mechanism moves and changes position.

As shown in Figures 1 to 3, a preferred embodiment of the power generation device with automatic angle adjustment function of the present invention is disclosed. It can be seen from the preferred embodiment disclosed in the drawings that the power generation device of the present invention includes a support Mechanism 10 , a dual-degree-of-freedom magnetic coupling mechanism 20 , an automatic angle adjustment mechanism 30 , a kinetic energy input component 40 and an electric energy generation module 50 .

As shown in FIGS. 1 to 3 , the support mechanism 10 includes a support body 11 . The support body 11 defines a central axis. The figures reveal that the central axis is longitudinal. The support body 11 has an accommodating space inside. space, and the support body 11 includes a spherical curved surface support part 12, and the spherical curved surface support part 12 is located at least at one central axial end of the support body 11.

As shown in Figures 1 to 3, in this preferred embodiment, the support body 11 includes a first shell part 111 and a second shell part 112. The first shell part 111 and the second shell part 112 can be the same or Different shapes, the first shell part 111 and the second shell part 112 can be butt combined to form a sealed hollow body, so that the support body 11 has the function of waterproof and dustproof, but the shape and structure of the support body 11 are not as mentioned above. Limited to spheres.

As shown in Figures 1 to 3, in the preferred embodiment shown, the first shell part 111 and the second shell part 112 are both semi-spherical shells, and the first shell part 111 and the second shell part 112 can move up and down. The butt combination forms a closed hollow spherical body, and the spherical curved surface support part 12 is provided at the top of the first shell part 111 located upward. The support mechanism 10 may further include a base 13 , which is provided at the bottom of the support body 11 . The base 13 serves as the support mechanism 10 to connect other components or fixed parts.

As shown in Figures 1 to 3, the two-degree-of-freedom magnetic coupling mechanism 20 is installed on the support body 11 of the support mechanism 10. The two-degree-of-freedom magnetic coupling mechanism 20 includes an outer magnetic shaft 21 and an inner magnetic force. The outer magnetic axis 21 is located outside the spherical curved support part 12 of the support mechanism 10 , and the inner magnetic axis 22 is located inside the spherical curved support part 12 of the support mechanism 10 . The outer magnetic axis 21 is connected to the spherical curved support part 12 of the support mechanism 10 . The inner magnetic shafts 22 can rotate together through the magnetic attraction coupling of the spherical curved surface support part 12. The double-degree-of-freedom magnetic coupling mechanism 20 can move and change when the spherical curved surface support part 12 of the support mechanism 10 moves. Location.

As shown in FIGS. 1 to 3 , the outer magnetic shaft 21 includes an outer shaft part 211 and an outer magnetic part 212 . The outer magnetic part 212 is disposed on the outer shaft part 211 facing the spherical curved surface support part 12 . At one end, the inner magnetic shaft 22 includes an inner shaft part 221 and an inner magnetic part 222. The inner magnetic part 222 is provided at one end of the inner shaft part 221 facing the spherical curved surface support part 12. The outer magnetic shaft 21 is connected to the inner magnetic part 222. The magnetic shaft 22 is coupled by magnetic attraction between the inner magnetic portion 222 and the outer magnetic portion 212 in the central axial direction. The outer magnetic part 212 of the outer magnetic shaft 21 and the inner magnetic part 222 of the inner magnetic shaft 22 may be a single magnet or a combination of multiple magnets. In this preferred embodiment, the outer magnetic part 212 of the outer magnetic shaft 21 and the inner magnetic part 222 of the inner magnetic shaft 22 are both a combination of a plurality of magnets.

As shown in FIGS. 1 to 3 , in the preferred embodiment shown, the dual-degree-of-freedom magnetic coupling mechanism 20 also includes a curved support member 23 , which includes a support seat 231 and a plurality of rolling elements. 232. The support seat 231 is located outside the spherical curved surface support part 12. The outer magnetic shaft 21 is pivoted in the support seat 231 by combining the outer shaft part 211 with a bearing. The plurality of rolling elements 232 are installed on the support. The seat 231 is arranged around the periphery of the outer magnetic shaft 21, and the plurality of rolling elements 232 can rollingly contact the outer side of the spherical curved surface support part 12, thereby reducing the friction between the curved surface support member 23 and the spherical curved surface support part 12. Friction resistance is provided, and the external magnetic shaft 21 is provided with auxiliary support force through the curved support member 23, and there is a distance between the external magnetic shaft 21 and the outer surface of the spherical curved support part 12, and the external magnetic shaft 21 is not in contact. The spherical curved surface support part 12.

As shown in FIGS. 1 to 3 , there is a distance between the inner magnetic axis 22 and the inner surface of the spherical curved support part 12 , and neither the outer magnetic axis 21 nor the inner magnetic axis 22 contacts the spherical curved support. Department 12.

As shown in FIGS. 1 to 3 , the automatic angle adjustment mechanism 30 is freely rotatable and installed in the accommodation space of the support mechanism 10 . The automatic angle adjustment mechanism 30 is connected to the inner magnetic shaft 22 and can rotate through the inner magnetic shaft 22 . The center of gravity automatically adjusts its angle to adapt to the installation environment of the support mechanism 10 to achieve the best installation angle. Preferably, through the automatic angle adjustment mechanism 30, there is a distance between the inner magnetic shaft 22 and the inner surface of the spherical curved support part 12, that is, the inner magnetic shaft 22 does not contact the spherical curved support part 12. , reduce frictional resistance.

In the preferred embodiment shown in Figures 1 to 5, the automatic angle adjustment mechanism 30 includes a movable ring 31 and a movable carrier 32. The movable ring 31 is combined with two first pivot elements 311 in a first The movable carrier 32 is axially coaxially pivoted in the support mechanism 10 . The movable carrier 32 is combined with two second pivoting elements 321 in a second axially coaxially pivoted movable ring 31 . The second axial direction is connected to the first movable ring 32 . The axial direction is orthogonal, and the first axial direction is orthogonal to the central axial direction. In this preferred embodiment, a transverse support ring 33 is disposed transversely in the second shell portion 112 of the support body 11 , and the movable ring 31 is pivoted in the transverse support ring 33 in conjunction with the two first pivot elements 311 .

As shown in Figures 1 to 5, a counterweight component 34 can be added to the bottom of the movable carrier 32. By placing the counterweight component 34 at the bottom of the movable carrier 32 to increase the weight, the center of gravity can be lowered so that the counterweight component 34 Combined with the automatic angle adjustment mechanism 30, it has better automatic angle adjustment performance.

As shown in Figures 1 to 3, the kinetic energy input component 40 is located outside the support body 11 and connected to the external magnetic shaft 21. The kinetic energy input component 40 can receive wind energy, water flow energy and other fluid energy, mechanical kinetic energy or other Kinetic energy, etc., and can transfer kinetic energy and input it into the dual-degree-of-freedom magnetic coupling mechanism 20 . In this preferred embodiment, the kinetic energy input component 40 is a component driven by wind energy. The kinetic energy input component 40 is a rotor with a plurality of blades 42 . The kinetic energy input component 40 includes a bracket 41 and a rotor surrounding the bracket 41 A plurality of blades 42 are connected to the outer magnetic shaft 21 through the bracket 41, so that the kinetic energy input component 40 can be driven by wind energy and input rotational kinetic energy to the dual-degree-of-freedom magnetic coupling mechanism 20.

As shown in Figures 1 to 5, the electrical energy generation module 50 is located in the support body 11 and installed in the automatic angle adjustment mechanism 30. The electrical energy generation module 50 is a mechanism that can convert mechanical energy into electrical energy. And can transmit electric energy to the outside world. The electric energy generation module 50 includes a driven shaft 51 connected to the inner magnetic axis 22 of the dual-degree-of-freedom magnetic coupling mechanism 20 . In this preferred embodiment, the electric energy generation module 50 is installed in the movable carrier 32 of the automatic angle adjustment mechanism 30 .

As shown in FIGS. 1 to 5 , the movable carrier 32 can further be provided with a power storage element 52 , which is electrically connected to the power generation module 50 and can store the power generated by the power generation module 50 , the power storage component 52 can be a rechargeable and dischargeable lithium battery or other components with a power storage function. An electrical connection component 53 can also be added to the base 13 of the support mechanism 10. The electrical connection component 53 is electrically connected to the power generation module 50 or the power storage component 52, so that the power generation module 50 generates power or stores power. The electrical energy stored in the element 52 is output through the electrical connection element 53 . The electrical connection component 53 may be a Universal Serial Bus (USB) type component or other types of electrical connection component 53 .

Regarding the use of the power generation device with automatic angle adjustment function of the present invention, take the application of the present invention in wind energy power generation as an example. The power generation device is connected between the kinetic energy input component and the electric energy generation module using a dual-degree-of-freedom magnetic coupling mechanism. , the dual-degree-of-freedom magnetic coupling mechanism can transmit two degrees of freedom of motion, making it suitable for turbulent wind fields and capable of changing in response to different kinetic energy input angles; on the other hand, the power generation device is configured using The automatic angle adjustment mechanism in the support mechanism carries the electric energy generation module and is combined with a dual-degree-of-freedom magnetic coupling to connect the kinetic energy input component. Among them, the automatic angle adjustment mechanism has two mutually orthogonal axial rotation mechanisms with the center of gravity principle. It can automatically adjust the angle by utilizing changes in the center of gravity, and then combines the dual-degree-of-freedom magnetic coupling mechanism to transmit the motion function of the two degrees of freedom, making the power generation device of the present invention more capable of responding to external kinetic energy input from multiple directions at any angle. The automatic adjustment to a better position further improves the efficiency of the power generation device of the present invention in converting external kinetic energy into electrical energy.

As can be seen from the foregoing description, the present invention adopts a modular dual-degree-of-freedom magnetic coupling mechanism with an automatic angle adjustment mechanism, connected between the power input component and the electric energy generation module. Through this combined structure of the modular mechanism, and the dual The degree of freedom magnetic coupling mechanism utilizes the characteristics of magnetic couplings to enable the installation of power input components that is not only easy to disassemble and carry, but also has the convenience of replacing different power input modules. Furthermore, the present invention can also utilize the streamlined combination structure of the modular mechanism to make the power generation device of the present invention suitable for miniaturization. For example, it is particularly suitable for outdoor camping, mountaineering activities, emergency situations, and where wind energy is relatively unstable. Applications such as places, etc. enable the present invention to be applied in people's lives.

10:Support mechanism 11:Support 111:First Shell Department 112:Second shell part 12:Spherical curved surface support part 13: Base 20:Double degrees of freedom magnetic coupling mechanism 21:External magnetic axis 211:Outer shaft part 212:External Magnetic Department 22:Inner magnetic axis 221:Inner shaft part 222:Inner magnetic department 23: Curved surface support components 231: Support base 232:Rolling element 30: Automatic angle adjustment mechanism 31:Activity ring 311: First pivot element 32: Activity carrier 321: Second pivot element 33: Lateral support ring 34: Counterweight components 40:Kinetic energy input component 41: Bracket 42: blade 50: Electric energy generation module 51: driven shaft 52:Electric storage components 53: Electrical connection components

Figure 1 is a schematic three-dimensional view of a preferred embodiment of the power generation device with automatic angle adjustment function of the present invention. FIG. 2 is an exploded perspective view of the preferred embodiment of the power generation device shown in FIG. 1 . FIG. 3 is a schematic side cross-sectional view of the preferred embodiment of the power generation device shown in FIG. 1 . FIG. 4 is a schematic perspective view of the automatic angle adjustment mechanism in the preferred embodiment of the power generation device shown in FIGS. 1 to 3 . FIG. 5 is a schematic top plan view of the automatic angle adjustment mechanism in the preferred embodiment of the power generation device shown in FIGS. 1 to 3 . Figure 6 is a schematic side plan view of the preferred embodiment of the power generation device shown in Figures 1 to 3 when the kinetic energy input component is in a deflected state.

10:Support mechanism

11:Support

111:First Shell Department

112:Second shell part

20:Double degrees of freedom magnetic coupling mechanism

21:External magnetic axis

211:Outer shaft part

212:External Magnetic Department

22:Inner magnetic axis

221:Inner shaft part

222:Inner magnetic department

23: Curved surface support components

231: Support base

232:Rolling element

30: Automatic angle adjustment mechanism

40:Kinetic energy input component

41: Bracket

42: blade

50: Electric energy generation module

51: driven shaft

52:Electric storage components

Claims (7)

A power generation device with automatic angle adjustment function, which includes: a support mechanism, which includes a support body, the support body defines a central axis, the support body includes a spherical curved surface support part; a double-degree-of-freedom magnetic coupling mechanism , which is installed on the support body of the support mechanism. The double-degree-of-freedom magnetic coupling mechanism includes an outer magnetic axis and an inner magnetic axis. The outer magnetic axis and the inner magnetic axis are respectively located on the spherical curved surface support of the support body. On the outside and inside of the part, the outer magnetic axis and the inner magnetic axis can rotate together through the magnetic coupling of the spherical curved surface support part, and the double-degree-of-freedom magnetic coupling mechanism can rotate in the circle of the support mechanism. The spherical surface support part moves to change the position; an automatic angle adjustment mechanism is rotatably installed in the support mechanism and connected to the inner magnetic axis. The automatic angle adjustment mechanism defines a first axial direction and a mutually orthogonal a second axial direction, and includes a movable ring and a movable carrier. The movable ring is pivoted in the support body along the first axial direction. The movable carrier is pivoted on the movable ring along the second axial direction. inside, and the movable carrier can automatically adjust its angle in the support mechanism through the center of gravity; a kinetic energy input component is located outside the support body and connected to the external magnetic axis of the dual-degree-of-freedom magnetic coupling mechanism, and the kinetic energy input component The component can receive an external kinetic energy and input the kinetic energy into the two-degree-of-freedom magnetic coupling mechanism; and an electric energy generation module installed in the movable carrier located in the support body, and the electric energy generation module is connected to the inner The magnetic shaft can receive the kinetic energy and convert it into electrical energy. The power generation device with automatic angle adjustment function as claimed in claim 1, wherein the two-degree-of-freedom magnetic coupling mechanism includes a curved support member, the curved support member includes a support seat and a plurality of rolling elements, the support seat is located On the outside of the spherical curved surface support part, the external magnetic axis is pivoted in the support seat with the external magnetic axis. There is a distance between the external magnetic axis and the outer surface of the spherical curved surface support part. The plurality of rolling elements Installed on the support base and surrounding the periphery of the outer magnetic shaft, the The plurality of rolling elements can rollingly contact the outer surface of the spherical curved surface support part, and there is a distance between the inner magnetic axis and the inner surface of the spherical curved surface support part. The power generation device with automatic angle adjustment function as claimed in claim 2, wherein the outer magnetic shaft includes an outer shaft part and an outer magnetic part, and the outer magnetic part is disposed on the outer shaft part facing the spherical curved surface support part. At one end, the inner magnetic shaft includes an inner shaft part and an inner magnetic part. The inner magnetic part is provided at one end of the inner shaft part facing the spherical curved surface support part. The outer magnetic axis and the inner magnetic axis pass through the inner magnetic part. The outer magnetic part is axially opposite to the center of the outer magnetic part and is magnetically coupled. The outer shaft part is pivoted in the support seat and connected to the kinetic energy input component, and the inner shaft part is connected to the automatic angle adjustment mechanism. The power generation device with automatic angle adjustment function as claimed in claim 1, wherein the support body includes a first shell part and a second shell part, and the first shell part and the second shell part are both hemispherical. The first shell part and the second shell part are butt-jointed and combined to form a closed hollow spherical body. The spherical curved surface support part is provided on the first shell part, and the automatic angle adjustment mechanism is provided on the second shell part. within the ministry. The power generation device with automatic angle adjustment function as described in claim 4, wherein a transverse support ring is fixed in the second shell part of the support body, and the movable ring is combined with two first pivot elements in the first axial direction. The axis is pivoted in the transverse support ring. The movable carrier system is combined with two second pivot elements and is coaxially pivoted in the second axial direction in the movable ring. The bottom of the movable carrier is provided with a counterweight component. The power generation device with automatic angle adjustment function as described in any one of claims 1 to 5, wherein the kinetic energy input component includes a bracket and a plurality of blades arranged in a ring on the bracket, and the bracket is used to connect the On the outer magnetic axis, the plurality of blades are located around the outer periphery of the support body. The power generation device with automatic angle adjustment function as described in any one of claims 1 to 5, wherein the movable carrier is provided with an electricity storage element, and the electricity storage element is electrically connected to the electric energy generation module; the support mechanism It includes a base, the base is located at the bottom of the support body, and an electrical connection element is provided in the base, and the electrical connection element is electrically connected to the electric energy generation module or the electricity storage element.

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