windmill

Abstract

The application provides a windmill, which comprises a rotating base, a rotating shaft vertically arranged on the rotating base as a power output shaft, a rotating frame fixedly arranged around the rotating shaft, and a wind blade plate hingedly arranged on the rotating frame. When the wind blade plate revolves around the rotating shaft, the wind blade plate rotates around the hinge shaft. The revolving direction of the wind blade plate is the same as or opposite to the rotating direction of the wind blade plate. A direction adjusting mechanism drives the rotating base to adjust the posture of the rotating base according to the wind direction. The posture adjustment rotation satisfies the following adaptive relationship: when the hinge shaft and the rotating shaft are perpendicular to the wind direction, the plate surface of one side of the wind blade plate is perpendicular to the wind direction, and when the wind blade plate revolves 180 degrees around the rotating shaft, the wind blade plate rotates 90 degrees to make the plate surface parallel to the wind direction. The plate surface of one wind blade plate on the windward surface of the windmill is perpendicular to the wind direction, so that the wind power can be used to the greatest extent to drive the whole windmill to rotate, and the windmill can still rotate under the slight wind.

Description

Technical Field

[0001] This invention relates to the technical field of wind energy utilization, and specifically to a windmill. Background Technology

[0002] With rapid economic development, energy consumption is also accelerating, and energy shortage has become an increasingly serious problem. Wind energy, as a renewable energy source, is receiving more and more attention. Currently, wind energy is mainly utilized by converting wind turbines into mechanical energy and then generators into electrical energy. Wind turbines can also be used directly as power sources for other devices.

[0003] Existing wind turbines typically rely on windmills to drive generator rotors to generate electricity. However, in natural environments, wind is often unpredictable, with constantly changing direction and strength. Because windmills are relatively large and their blades are narrow, in weak or light winds, the turbines lack sufficient power to rotate the generator rotors, thus limiting wind power generation and failing to meet the requirements for continuous power generation and supply. Furthermore, insufficient wind means the generators remain idle, resulting in wasted resources. Prolonged inactivity can also cause equipment rust and damage. Additionally, windmills need to maintain a consistent direction of rotation to prevent voltage instability. Summary of the Invention

[0004] The purpose of this invention is to provide a windmill that can maintain the same direction of rotation.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a windmill includes a rotating base, on which a rotating shaft serving as a power output shaft is vertically arranged. A rotating frame is fixedly installed around the rotating shaft, and a wind blade is hinged to the rotating frame. The direction of the hinge axis of the wind blade is parallel to the direction of the rotating shaft axis. At least two wind blades are evenly spaced around the rotating shaft axis. When the wind blade revolves around the rotating shaft axis, the wind blade rotates around its hinge axis axis. The direction of the revolution of the wind blade is the same as or opposite to the direction of rotation of the wind blade. A steering mechanism drives the rotating base to adjust its rotation according to the wind direction. The rotation of the posture adjustment satisfies the following adaptation relationship: when the plane containing the hinge axis axis and the rotating shaft axis axis is perpendicular to the wind direction, the surface of one side of the wind blade is perpendicular to the wind direction. When the wind blade revolves 180° with the rotating shaft, the wind blade rotates 90° so that its surface is parallel to the wind direction. A rotating support structure is provided between the rotating shaft and the frame for axial support of the rotating shaft and the connected wind blade.

[0006] In the above scheme, the wind turbine has a blade plate on its windward side that is perpendicular to the wind direction. This maximizes the use of wind power to drive the entire wind turbine to rotate. The wind turbine can still rotate even in a light breeze, further improving the utilization rate of wind energy. At the same time, the rotating seat in this invention can rotate with the wind direction, so the wind turbine in this invention can maintain stable rotation under any wind direction, and the wind turbine can maintain a constant direction of rotation with the wind force. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0008] Figure 2 , 3 This is a schematic diagram of the structure of the present invention;

[0009] Figure 4 , 5 Figure 10 shows a schematic diagram of the windmill base structure;

[0010] Figure 6 for Figure 5 Sectional view of plane AA;

[0011] Figure 7 , 11 This is a breakdown diagram of the windmill base;

[0012] Figure 8 , 9 This is a schematic diagram illustrating the working principle of the present invention. Detailed Implementation

[0013] A device for adjusting the following angle of a windmill blade includes a rotating base 10, on which a rotating shaft 30 serving as a power output shaft is vertically arranged. A rotating frame 40 is fixedly mounted circumferentially on the rotating shaft 30, and a windmill blade 50 is hinged to the rotating frame 40. The axis of the hinge shaft 51 of the windmill blade 50 is parallel to the axis of the rotating shaft 30. At least two windmill blades 50 are evenly spaced circumferentially around the rotating shaft 30. When a windmill blade 50 revolves around the axis of the rotating shaft 30 by a revolution α, the windmill blade 50 rotates around its hinge shaft 51 by a rotation β. The direction of the revolution α of the windmill blade 50 is... The direction adjustment mechanism drives the rotating seat 10 to adjust its posture according to the wind direction, which is the same as or opposite to the direction of the rotation β of the blade 50. The posture adjustment rotation satisfies the following adaptation relationship: when the plane where the core of the hinge shaft 51 and the core of the rotating shaft 30 are located is perpendicular to the wind direction, the surface of one side of the blade 50 is perpendicular to the wind direction. When the blade 50 revolves 180° with the rotating shaft 30, the blade 50 rotates 90° to make its surface parallel to the wind direction. A rotation support structure 34 is provided between the rotating shaft 30 and the frame 90 for axial support of the rotating shaft 30 and the connected blade 50.

[0014] In the above scheme, when the plane containing the core of the hinge shaft 51 and the core of the rotating shaft 30 is perpendicular to the wind direction, the blade surface of the wind vane 50 on one side of the wind direction is perpendicular to the wind direction and faces the wind, while the blade surface of the wind vane 50 on the other side is parallel to the wind direction and faces the wind. In this way, there is a huge difference in the windward area of ​​the two wind vanes 50 on the wind direction, thereby ensuring that the rotation direction of the rotating shaft 30 remains unchanged and the rotation torque is maximized, so as to maximize the wind power utilization. The essence of the present invention is that the windward area of ​​the wind vane 50 is different at different positions due to the rotation β of the wind vane 50. This will make the resultant torque of the rotating shaft 30 on one side of the wind direction greater than the resultant torque on the other side, thereby realizing the revolution α of the wind vane 50 around the core of the rotating shaft 30. As the wind turbine blade 50 revolves α, it also rotates β. When the wind turbine blade 50 revolves 180°, it rotates 90°. That is, the ratio of the angle of the wind turbine blade 50's revolution α to the angle of its rotation β is 2:1. Since the wind turbine blade 50 is a symmetrical plate structure, the angle between its plate surface and the wind direction is the same when its rotation β is 180° and 360°. This ensures that the windward area of ​​the wind turbine blade 50 is the same at each position when it revolves α, thus enabling the windmill to operate continuously and stably. The essence of the rotating seat 10 following the wind direction is: let the point where the rotating seat 10 faces the wind direction be position 0. When the wind direction changes, the adjusting mechanism drives the rotating seat 10 to rotate so that position 0 faces the wind direction. The rotating support structure 34 in this invention is an axial support bearing or a magnetic levitation mechanism. The wind turbine in this invention has a large windward surface, which can maximize the use of wind power to drive the entire wind turbine to rotate. The wind turbine can still rotate in a light breeze, further improving the utilization rate of wind energy. At the same time, the rotating seat 10 in this invention can rotate with the wind direction, so the wind turbine in this invention can maintain stable rotation in any wind direction, and the wind turbine can maintain a constant direction of rotation with the wind force.

[0015] A base gear 13, coaxial with the rotating shaft 30, is fixedly mounted on the rotating seat 10. The base gear 13 meshes with a number of transition gears 15 corresponding to the number of fan blades 50. A transition bevel gear 16 is coaxially mounted on the transition gear 15. A conical driven gear 52 is coaxially fixedly mounted on the hinge shaft 51 of the fan blade 50. Both ends of the transmission shaft 60, whose shaft center is located in the horizontal plane, are coaxially arranged with bevel gears 61. The two bevel gears 61 mesh with the transition bevel gear 16 and the conical driven gear 52, respectively. In the above scheme, the transmission shaft 60 and other linkage mechanisms can be arranged above or below the fan blades 50 along with the rotating seat 10. This scheme achieves the linkage of the fan blades 50's revolution α and rotation β through a mechanical structure, which is simple, convenient, and less prone to errors. Compared with electric control, it eliminates the need for complex wiring.

[0016] The ratio of the revolution α of the wind turbine blade 50 to its rotation β relative to the ground is 2:1. This ensures that the wind turbine blade 50 maintains the same angle with the wind direction when it rotates to the same position.

[0017] The revolution α direction of the wind turbine blade 50 is the same as the rotation β direction of the wind turbine blade 50 relative to the earth. This means that when viewed from above, both revolution α and rotation β of the wind turbine blade 50 rotate counterclockwise or clockwise. The direction of rotation β is relative to the earth. Since the wind turbine blade 50 rotates while revolving, its rotation β relative to the earth is equal to revolution α minus its rotation angle relative to its hinge axis 51. Its rotation direction relative to the hinge axis 51 is opposite to the revolution α direction.

[0018] When the plane containing the hinge shaft 51 and the rotating shaft 30 is parallel to the wind direction, the angle between the blade surface of the wind vane 50 and the wind direction is 45°. When the wind vane 50 is in this position, the angle between the blade surfaces of the forward and rear positions of the wind vane 50 is 90°. The wind vane 50 rotates 90° when it rotates from the forward position to the rear position. Using a wind direction tracking system, the driving device ensures that the angle between the foremost wind vane and the wind direction is always maintained at 45 degrees.

[0019] A braking device is provided on the transmission path between the wind vane 50 and the steering mechanism to limit the rotation of the rotating seat 10. When the wind direction does not change, the braking device is needed to limit the rotation of the rotating seat 10 to prevent it from deflecting under the action of external force.

[0020] The system also includes a frustum-shaped cylindrical base 70 mounted on a base plate 80. The rotating shaft 30 passes through the rotating seat 10, the base 70, and the base plate 80, forming a clearance fit with all three. A lower radial bearing 71, with its shaft core oriented vertically, is installed within the base 70 to radially support the rotating shaft 30. An axial bearing 12, with its shaft core oriented vertically, is coaxially arranged at the upper end of the base 70 to support the rotating seat 10. An upper radial bearing 11, with its shaft core oriented vertically, is installed within the rotating seat 10 to radially support the rotating seat 10. The shaft body of the rotating shaft 30 is placed within the upper and lower radial bearings 11 and 71, forming a small clearance dynamic fit with the inner rings of the bearings. The upper radial bearing 11 is located on the upper end face of the axial bearing 12. In this design, the clearance fit aims to prevent contact friction between the rotating shaft 30 and the rotating seat 10, base 70, and base plate 80 during rotation, which could cause equipment wear and energy loss. Simultaneously, it allows the base 70 to be adjusted within the clearance range to address the issue of the rotating shaft 30 being misaligned. The small clearance dynamic fit is to ensure that the upper and lower radial bearings 11 and 71 and the shaft body of the rotating shaft 30 are not transmitted axial force, and also to ensure that when the shaft core of the rotating shaft 30 is eccentric during rotation, the force on the radial bearings is within its bearing capacity. In addition, when the shaft core of the rotating shaft 30 is slightly misaligned, the upper and lower radial bearings 11 and 71 provide radial forces with a certain spacing and opposite direction, which act as bending moments on the transition shaft 32 to support and return it to its position. The base 70 and the lower radial bearing 71 inside it are used to provide radial support for the rotating shaft 30, so that the rotating shaft 30 can rotate freely on the base 70. Since the windmill is large in size, the corresponding rotating seat 10 is also large and heavy. The axial bearing 12 supports the rotating seat 10 while ensuring that it can rotate relative to the base 70.

[0021] A conical base gear 13, co-centric with the rotating shaft 30, is fixedly mounted on the rotating seat 10. A conical driven gear 52, co-centrically mounted on the hinge shaft 51 of the fan blade 50, is fixedly mounted on the fan blade 50. Conical gears 61 are co-centrically arranged at both ends of the transmission shaft 60, whose shaft core is located in the horizontal plane. The two conical gears 61 mesh with the conical base gear 13 and the conical driven gear 52, respectively. The transmission ratio between the conical base gear 13 and the conical driven gear 52 is 2:1. The cone bottoms of the conical base gear 13 and the conical driven gear 52 face the same direction. The meshing sides of the two conical gears 61 with the conical base gear 13 and the conical driven gear 52 are located on the side of the corresponding gear away from the rotating shaft 30. In the above-described scheme, the drive shaft 60 and other linkage mechanisms can be arranged either above or below the fan blade 50 along with the rotating seat 10. This scheme achieves the linkage between the fan blade 50's revolution α and rotation β through a mechanical structure, which is simple, convenient, and less prone to errors. Compared to electric control, it eliminates complex wiring, and shaft transmission is less prone to chain slippage and damage than chain transmission, making maintenance and management easier. The orientation of the cone base gear 13 and the cone driven gear 52 is designed to ensure that the directions of revolution α and rotation β are the same. In this invention, the cone base gear 13 and the cone driven gear 52 face upwards, so that the meshing surface of the cone gear is located below the cone base, which is less prone to dust accumulation and helps extend their service life.

[0022] The directional adjustment mechanism includes a directional sprocket or gear 14 fixedly mounted concentrically on the rotating base 10. The drive mechanism receives the position signal from the wind vane 20 and drives the sprocket or gear 14 to rotate following the wind vane 20. That is, the power transmission method of the directional adjustment mechanism is chain drive or gear drive, or it can be a worm gear structure. The worm gear structure has both driving and braking positioning functions, thus achieving synchronous rotation of the rotating base 10 and the wind vane 20. Furthermore, the drive mechanism provides a certain rotation limit to the rotating base 10 to prevent the rotation of the shaft 30 from driving the rotating base 10. The rotating base 10 can be arranged below the shaft 30, facilitating maintenance and wiring. This scheme ensures the realization of power transmission for the directional adjustment mechanism while avoiding mutual interference due to the misalignment of the rotation with the rotating frame 40.

[0023] The base plate 80 on the outer side of the base 70 is provided with adjusting bolts 81 for adjusting the position of the shaft core of the base 70. This allows for adjustment of the concentricity of the upper and lower bases 70 during installation, and adjustment of the position of the shaft core of the rotating shaft 30, ensuring that the shaft cores at the upper and lower ends of the rotating shaft 30 are aligned and do not produce large offsets, thus avoiding damage to components caused by misalignment.

[0024] The rotating shaft 30 includes an upper connecting shaft 31 connected to the rotating frame 40 and a transition shaft 32 passing through the rotating seat 10, the base 70, and the bottom plate 80. The upper connecting shaft 31 and the transition shaft 32 are connected by a flange. The outer wall of the transition shaft 32 is a stepped shaft shape with a larger upper part and a smaller lower part. Its stepped surface is spaced apart from the upper end surface of the upper radial bearing 11. The lower connecting shaft 33 and the transition shaft 32 are hollow tubular shafts and are connected by insertion and axial and circumferential limiting connection. The lower end of the lower connecting shaft 33 is provided with a flange for connecting the power receiving mechanism. Due to the large size of the wind turbine, the multi-segment structure of the shaft 30 facilitates transportation, assembly, and processing. The inclusion of a transition shaft 32, connected to the upper and lower radial bearings 11 and 71, ensures the machining accuracy of the transition shaft 32 and facilitates installation. Otherwise, machining a long shaft 30 to the required precision would be extremely difficult, and the assembly process with the upper and lower radial bearings 11 and 71 would be challenging due to its excessive length. For a transition shaft 32 approximately one meter long, machining is very convenient, and installation is not difficult. The stepped shaft shape of the transition shaft 32 allows the radial bearings to temporarily bear the weight of the transition shaft 32 before the rotation support structure 34 is fully installed, preventing damage to the bearings from the weight of a single transition shaft. Furthermore, the shaft 30 is tubular, ensuring sufficient space on its perimeter for installing the rotating frame 40 while minimizing its weight. The lower end of the lower connecting shaft 33 serves as the power output end, allowing it to be connected to a generator to generate electricity using wind power.

[0025] The main body of the wind turbine is axially arranged on a multi-layer platform 91 along the rotating shaft 30 on the frame 90. The base plate 80 is set on the upper surface of the platform 91, and the upper end of the upper connecting shaft 31 is provided with a flange that connects to the transition shaft 32 of the upper wind turbine main body. In this way, the windward area of ​​the wind turbine can be increased by arranging multiple wind turbines in the same area, thereby increasing the power generation. At the same time, the power of the multiple wind turbines is integrated on a single shaft by connecting the upper and lower rotating shafts 30 through the flange, which is convenient for disassembly and assembly and only requires the number of wind turbine layers to be arranged according to the load-bearing capacity.

[0026] The rotating frame 40 includes cantilever 41s arranged corresponding to the upper and lower ends of the fan blades. The inner end of the cantilever 41 has a half-shaped structure. The outer ends of the upper and lower cantilever 41 are provided with bearing seats and radial bearings for supporting the hinge shaft 51. An axial support structure is provided at the hinge shaft 51 at the outer end of the cantilever 41 to counteract the gravity of the fan blades 50. When there are two fan blades, it is a half-shaped structure. The axial angle occupied by the inner end structure of a single cantilever 41 is 360° divided by the number of fan blades. Thus, only a single cantilever 41 needs to be manufactured for manufacturing and transportation. The half-shaped structure is also relatively easy to assemble and disassemble. The axial support structure is an axial support bearing or a magnetic levitation structure.

[0027] A tie rod 42 is provided between the lower cantilever 41 and the rotating shaft 30. The cantilever 41, rotating shaft 30, and tie rod 42 together form a triangular structure in the vertical plane. The lower part of the blade 50 is trapezoidal to avoid the location of the tie rod 42. Due to the large size of the wind turbine, the lower cantilever 41 is subjected to a large force. Therefore, the tie rod 42 is provided to improve its load-bearing capacity. When the space below the lower cantilever 41 is limited and it is not convenient to arrange the tie rod 42, the tie rod 42 can be arranged above the lower cantilever 41, and the lower part of the blade 50 is designed to avoid the tie rod 42.

[0028] A shaft brake is installed between the shaft 30 and the frame 90 to limit the wind turbine's revolution α. ​​The function of the shaft brake is to stop the wind turbine when maintenance is required, and also to prevent the wind turbine's rotation from causing safety hazards during disassembly and assembly.

[0029] A blade brake is provided between the hinge shaft 51 and the rotating frame 40 to limit the rotation β of the fan blade 50. The function of the blade brake is to prevent the fan blade 50 from interfering with the disassembly and assembly operation when it is not linked to the rotating shaft 30 and can rotate freely. At this time, the fan blade is provided to prevent its rotation β from interfering with the disassembly and assembly operation, and also to avoid the safety hazards caused by the rotation of the fan blade 50 during the disassembly and assembly process.

Claims

1. A pinwheel, characterized by: The windmill comprises a rotating base (10), a rotating shaft (30) vertically arranged on the rotating base (10) as a power output shaft, a rotating frame (40) fixedly arranged on the rotating shaft (30) in the circumferential direction, and a wind blade plate (50) hingedly connected to the rotating frame (40), wherein the hinging shaft (51) of the wind blade plate (50) is parallel to the axis of the rotating shaft (30), the wind blade plate (50) is arranged at least two on the rotating shaft (30) in the circumferential direction and uniformly spaced, the wind blade plate (50) revolves (α) around the axis of the rotating shaft (30) and simultaneously rotates (β) around the hinging shaft (51) of the wind blade plate (50), the revolving direction (α) of the wind blade plate (50) is the same as or opposite to the rotating direction (β) of the wind blade plate (50), a direction adjusting mechanism drives the rotating base (10) to adjust the posture of the rotating base (10) according to the wind direction, the posture adjustment satisfies the following adaptive relationship: when the hinging shaft (51) is perpendicular to the plane in which the axis of the rotating shaft (30) is located, the surface of the wind blade plate (50) on one side is perpendicular to the wind direction, the wind blade plate (50) rotates 90° around the hinging shaft (51) when the wind blade plate (50) revolves 180° around the rotating shaft (30) to make the surface of the wind blade plate (50) parallel to the wind direction, and a rotating support structure (34) is arranged between the rotating shaft (30) and a frame (90) to axially support the rotating shaft (30) and the wind blade plate (50) connected thereto. The rotating shaft (30) comprises an upper connecting shaft (31) connected to the rotating frame (40) and a transition connecting shaft (32) penetrating the rotating base (10), a base (70) and a bottom plate (80), the upper connecting shaft (31) and the transition connecting shaft (32) are connected by flanges, the outer wall of the transition connecting shaft (32) is in the shape of a stepped shaft with a large upper part and a small lower part, the stepped surface of the transition connecting shaft (32) is arranged at a distance from the upper end surface of the upper radial bearing (11), and the lower connecting shaft (33) and the transition connecting shaft (32) are hollow tubular shafts and are axially and circumferentially limited and connected after being inserted and connected. The windmill body is arranged on the platform (91) in the axial direction of the rotating shaft (30) on the frame (90), the bottom plate (80) is arranged on the upper surface of the platform (91), and the windmill further comprises a cylindrical base (70) arranged on the bottom plate (80), the rotating shaft (30) penetrates the rotating base (10), the base (70) and the bottom plate (80) and is in clearance fit with the three, the base (70) is internally provided with a lower radial bearing (71) with the axis in the vertical direction for radially supporting the rotating shaft (30), the upper end of the base (70) is coaxially provided with an axial bearing (12) with the axis in the vertical direction for supporting the rotating base (10), the rotating base (10) is internally provided with an upper radial bearing (11) with the axis in the vertical direction for radially supporting the rotating base (10), the shaft body of the rotating shaft (30) is arranged in the upper and lower radial bearings (11, 71) and is in small clearance fit with the inner ring of the bearings, and the upper radial bearing (11) is arranged on the upper end surface of the axial bearing (12).

2. The pinwheel of claim 1, wherein: The revolving speed ratio (α) of the wind blade plate (50) to the rotating speed (β) of the wind blade plate (50) relative to the earth is 2:

1.

3. The pinwheel of claim 1, wherein: The revolution (α) direction of the wind blade plate (50) is the same as the rotation (β) direction of the wind blade plate (50) relative to the earth.

4. The pinwheel of claim 1, wherein: When the axis core of the hinge shaft (51) and the axis core of the rotating shaft (30) are parallel to the wind direction, the angle between the surface of the wind blade plate (50) and the wind direction is 45°.

5. The pinwheel of claim 1, wherein: A brake device is arranged on the transmission path between the wind blade plate (50) and the direction adjusting mechanism to limit the rotation of the rotating seat (10).

6. The pinwheel of claim 1 or 2 or 3 or 4 or 5, wherein: A conical base gear (13) is fixedly arranged on the rotating shaft (30), and a conical driven gear (52) is fixedly arranged on the hinge shaft (51) of the wind blade plate (50). The two ends of a transmission shaft (60) with the axis core direction in the horizontal plane are arranged with bevel gears (61). The two bevel gears (61) are respectively engaged with the conical base gear (13) and the conical driven gear (52). The transmission ratio between the conical base gear (13) and the conical driven gear (52) is 2:

1. The orientations of the cone bottoms of the conical base gear (13) and the conical driven gear (52) are the same. The engagement sides of the two bevel gears (61) and the conical base gear (13) and the conical driven gear (52) are located on the sides of the corresponding gears away from the rotating shaft (30).

7. The pinwheel of claim 1 or 2 or 3 or 4 or 5, wherein: The direction adjusting mechanism includes a direction adjusting sprocket or gear (14) fixedly arranged on the rotating seat (10). The driving mechanism receives the position signal of the wind vane (20) to drive the direction adjusting sprocket or gear (14) to rotate with the wind vane (20).

8. The pinwheel of claim 1, wherein: A core adjusting bolt (81) is arranged on the bottom plate (80) outside the base (70) to adjust the axis core position of the base (70).

9. The pinwheel of claim 1, wherein: The upper end of the upper connecting shaft (31) is provided with a flange plate connected with the transition adapter shaft (32) of the upper windmill body.

10. The pinwheel of claim 1, wherein: The rotating frame (40) includes cantilevers (41) arranged corresponding to the upper and lower ends of the wind blade plate. The inner end of the cantilever (41) is a half structure. The outer ends of the upper and lower cantilevers (41) are provided with bearing seats and radial bearings for supporting the hinge shaft (51). The hinge shaft (51) at the outer end of the cantilever (41) is provided with an axial support structure for offsetting the gravity of the wind blade plate (50).

11. The pinwheel of claim 10, wherein: The lower cantilever (41) and the rotating shaft (30) are provided with a diagonal pull rod (42). The cantilever (41), the rotating shaft (30), and the diagonal pull rod (42) form a triangular structure in the vertical plane. The lower part of the wind blade plate (50) is trapezoidal to avoid the position of the diagonal pull rod (42).

12. The pinwheel of claim 1, wherein: The rotating shaft (30) and the rack (90) are provided with a rotating shaft brake to limit the revolution (α) of the windmill.

13. The pinwheel of claim 1, wherein: The hinge shaft (51) and the rotating frame (40) are provided with a wind blade brake to limit the rotation (β) of the wind blade plate (50).

Images