Wind driven generator with blade self-adaptive variable angle function

Abstract

The invention discloses a wind driven generator with a blade self-adaptive variable angle function. The wind driven generator comprises a rack, a generator module and an impeller module. The impeller module comprises a frame body and a plurality of blades, the frame body is rotatably connected to the generator module, a plurality of rotating shafts are mounted on the frame body, the blades are rotatably connected to the rotating shafts, each blade is provided with a first stress surface and a second stress surface, and a stop block is arranged on the frame body; the symmetric line of the rack is taken as a boundary along the wind direction; when the blades are on the first side of the boundary, the blades are pressed on the stop blocks by wind power; when the blades are close to the top of the boundary, the blades turn around the rotating shaft under wind power and are parallel to the wind direction; when the blades are on the second side of the boundary, the blades are parallel to the wind direction; when the blades are close to the bottom of the boundary, the blades are pressed on the stop blocks by wind force. Through a pure mechanical structure, a power driving structure does not need to be additionally arranged, complex wind direction and wind speed calculation is not needed, the blades can adapt to airflow variable angles, and the airflow adapting capacity of the blades is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbines, and in particular to a wind turbine with a blade adaptive angle-changing function. Background Art

[0002] The working principle of a wind turbine is that the impeller module rotates under the impact of wind, which converts the kinetic energy of the wind into the mechanical energy of the impeller module. The wind turbine rotates and generates electricity under the drive of the impeller module.

[0003] However, the force-bearing surface of each blade in the existing wind turbine cannot automatically adapt to the flow direction of the airflow. In order to adapt to the incoming wind direction, complex wind direction and wind speed calculations and servo motor drive are required to adjust the blades to adapt to the wind direction. As a result, the production cost of the wind turbine is high and the impeller module has weak ability to adapt to airflow. Summary of the invention

[0004] The main purpose of the present invention is to provide a wind turbine with a blade adaptive angle-changing function, aiming to achieve the ability of the blades to adaptively rotate according to the wind direction and angle through a purely mechanical structure, thus having a strong ability to adapt to airflow and reducing production costs.

[0005] To achieve the above object, the present invention proposes a wind turbine with a blade adaptive angle-changing function, comprising: A frame, on which a generator module is installed; An impeller module, comprising a frame and a plurality of blades, wherein the frame is rotatably connected to the generator module, a plurality of rotating shafts are mounted on the frame, a plurality of blades are rotatably connected to the plurality of rotating shafts one by one, the blades have a first force-bearing surface and a second force-bearing surface, a stopper is arranged on the frame, and the stopper can block one side of the blade; Along the wind direction, the symmetry line of the frame is used as the dividing line; when the blade is on the first side of the dividing line, the first force-bearing surface faces the wind direction, and the blade is pressed on the block by the wind force; when the blade is close to the top of the dividing line, the force-bearing surface of the blade is switched from the first force-bearing surface to the second force-bearing surface, the blade is flipped around the rotation axis by the wind force, and the blade is parallel to the wind direction; when the blade is on the second side of the dividing line, the blade is parallel to the wind direction; when the blade is close to the bottom of the dividing line, the first force-bearing surface faces the wind direction, and the blade is pressed on the block by the wind force.

[0006] Preferably, the blade is divided into a first sub-blade and a second sub-blade with the axis of the rotating shaft as a dividing line, and the width of the first sub-blade is greater than the width of the second sub-blade.

[0007] Preferably, the block is telescopically arranged on the frame, so that the block has a blocking state and a releasing state. In the blocking state, the blade covers the block; when the block is subjected to excessive pressure from the blade, the block changes from the blocking state to the releasing state; in the releasing state, the blade is released by the block to a free state.

[0008] Preferably, in the blocking state, the distance between the block and the rotation axis is smaller than the width of the first sub-blade, and the distance between the block and the rotation axis is larger than the width of the second sub-blade; in the releasing state, the distance between the block and the rotation axis is larger than the width of the first sub-blade, and the distance between the block and the rotation axis is larger than the width of the second sub-blade.

[0009] Preferably, a fixing block is further provided on the frame, a receiving groove is provided in the fixing block, a spring is provided in the receiving groove, and the spring is provided between the stop block and an inner wall of the fixing block on a side away from the stop block.

[0010] Preferably, the stopper is provided with a guide groove, the fixing block is provided with a convex strip in the receiving groove, and the stopper can slide in the receiving groove by adapting the convex strip to the guide groove.

[0011] Preferably, the blade is in the shape of a rectangular plate.

[0012] Preferably, the first sub-blade is a 1 / 3 blade, and the second sub-blade is a 2 / 3 blade.

[0013] Preferably, the number of the blades is 3 or 4.

[0014] Preferably, the frame includes an impeller shaft and a plurality of rotating arms fixedly connected to the side walls of the impeller shaft, the impeller shaft is rotatably connected to the generator module, the plurality of rotating arms are evenly arranged along the circumference of the impeller shaft, and the rotating shaft is mounted on each rotating arm.

[0015] Compared with the prior art, in the wind turbine of the technical solution of the present invention, during the clockwise rotation of the impeller module, when the blades are on the left side of the dividing line, the blades on the left side are blocked by the block, thereby providing assistance for the clockwise rotation of the impeller module. As the impeller module continues to rotate clockwise, the blades are always pressed on the block, and the angle between the blades and the incoming wind direction gradually increases. The blades have a good wind receiving area, thereby providing assistance for the clockwise rotation of the impeller module. When the blades rotate to the top of the dividing line, the force-bearing surface of the blades is converted from the first force-bearing surface to the second force-bearing surface, the force-bearing surface of the blades changes, and the blades are reversed by the action of wind force. The positions of the two side edges of the blades are interchanged, so that the blades are parallel to the wind direction. Subsequently, during the clockwise rotation of the impeller module, the blades are always parallel to the wind direction when they rotate to the right side of the dividing line, thereby reducing resistance and automatically adapting to the airflow. As the impeller module continues to rotate clockwise, when the blades reach the bottom of the dividing line, the blades are again pressed on the block by the wind force, thereby providing assistance for the rotation of the blades again. With such an arrangement, the wind turbine of the present invention rationally utilizes wind power through its own purely mechanical structure, and does not require the setting of an additional power drive structure, nor does it require complicated wind direction and wind speed calculations and servo motor drive, so that each blade can automatically adjust its own angle under the drive of wind power, and the power angle adapts to changes in wind direction, so that the blades have large thrust with the wind and small resistance against the wind during the rotation of the impeller module, large thrust on one side and small resistance on the other side, thereby maximizing the utilization of mechanical energy, better adapting to airflow, improving wind energy utilization, and reducing the production cost of wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the wind turbine of the present invention; Figure 2 It is a structural schematic diagram of the impeller module in the wind turbine generator of the present invention; Figure 3 A top view of the wind turbine of the present invention in a first rotation state; Figure 4 A top view of the wind turbine of the present invention in a second rotation state; Figure 5 A top view of the wind turbine of the present invention in a third rotation state; Figure 6 A top view of the wind turbine of the present invention in a fourth rotation state; Figure 7 A schematic diagram of the rotation of the wind turbine of the present invention; Figure 8 It is a structural schematic diagram of a fixing block of a wind turbine generator of the present invention; Fig. 9 It is a schematic structural diagram of a stopper and a spring of a wind turbine generator according to the present invention.

[0017] Explanation of the accompanying drawings: 100, frame; 200, generator module; 110, frame; 120, blade; 130, rotating shaft; 101, dividing line; 121, first sub-blade; 122, second sub-blade; 140, stopper; 123, first force-bearing surface; 124, second force-bearing surface; 111, impeller shaft; 112, rotating arm; 113, first reinforcement strip; 114, second reinforcement strip; 101, first blade; 102, second blade; 103, third blade; 300, fixing block; 311, receiving groove; 320, spring; 141, guide groove; 330, convex strip. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 9 The present invention provides a wind turbine with a blade 120 having an adaptive angle-changing function.

[0020] The wind turbine generator comprises a frame 100 and an impeller module, wherein a generator module 200 is mounted on the frame 100; the impeller module comprises a frame body 110 and a plurality of blades 120, wherein the frame body 110 is rotatably connected to the generator module 200, a plurality of rotating shafts 130 are mounted on the frame body 110, and the plurality of blades 120 are rotatably connected to the plurality of rotating shafts 130 one by one, wherein the blades 120 have a first force-bearing surface 123 and a second force-bearing surface 124, and a stopper 140 is arranged on the frame body 110, wherein the stopper 140 can block one side of the blade 120; along the wind direction, the symmetry line of the frame 100 is used as the dividing line 1 01; when the blade 120 is on the first side of the dividing line 101, the first force-bearing surface 123 faces the wind direction, and the blade 120 is pressed on the block 140 by the wind force; when the blade 120 is close to the top of the dividing line 101, the force-bearing surface of the blade 120 is switched from the first force-bearing surface 123 to the second force-bearing surface 124, and the blade 120 is flipped around the rotation axis 130 by the wind force, and the blade 120 is parallel to the wind direction; when the blade 120 is on the second side of the dividing line 101, the blade 120 is parallel to the wind direction; when the blade 120 is close to the bottom of the dividing line 101, the first force-bearing surface 123 faces the wind direction, and the blade 120 is pressed on the block 140 by the wind force.

[0021] Specifically, driven by wind, the blades 120 drive the entire impeller module to rotate around the central axis of the generator module 200, and the generator module 200 can generate electricity through the rotation of the impeller module and the internal structure of the generator module 200. Of course, the impeller module can also be disassembled and used separately, and used in other power transmission mechanisms to transmit the mechanical energy of the impeller module rotated by wind to the outside, all of which are within the protection scope of the present invention.

[0022] The wind turbine of the present invention can realize the adaptive angle change of the blade 120, improve the ability of the blade 120 to adapt to the airflow, and improve the utilization rate of wind energy. Figure 7 As shown, the first side of the dividing line 101 is defined as the left side, and the second side of the dividing line 101 is defined as the right side. Figure 7 The wind direction is indicated by two triangles from front to back. From left to right are schematic diagrams of the four different rotation states of the impeller module during clockwise rotation, and are respectively Figure 3 , Figure 4 , Figure 5 , Figure 6 Schematic diagram of the rotation state, where 101 is the first blade, 102 is the second blade, and 103 is the third blade. During the clockwise rotation of the impeller module, when the blade 120 is on the left side of the dividing line 101, the blade 120 on the left side is blocked by the block 140, which provides assistance for the clockwise rotation of the impeller module. As the impeller module continues to rotate clockwise, the blade 120 is always pressed on the block 140, and the angle between the blade 120 and the incoming wind direction gradually increases. The blade 120 has a good wind receiving area, which provides assistance for the clockwise rotation of the impeller module; when the blade 120 rotates to the top of the dividing line 101, the force surface of the blade 120 is converted from the first force surface 123 to the third force surface 140. When it reaches the second force-bearing surface 124, the force-bearing surface of the blade 120 changes, and the blade 120 is reversed by the wind force. The positions of the two sides of the blade 120 are interchanged, so that the blade 120 is parallel to the wind direction. Subsequently, during the clockwise rotation of the impeller module, the blade 120 is always parallel to the wind direction when it rotates to the right side of the dividing line 101, reducing resistance and automatically adapting to the airflow. As the impeller module continues to rotate clockwise, when the blade 120 reaches the bottom of the dividing line 101, the blade 120 is again pressed on the block 140 by the wind force, which again provides assistance for the rotation of the blade 120. With such an arrangement, the wind turbine of the present invention rationally utilizes wind power through its own purely mechanical structure, and does not require the setting of an additional power drive structure, nor does it require complicated wind direction and wind speed calculations and servo motor drive, so that each blade 120 can automatically adjust its own angle under the drive of wind power, and the power angle adapts to changes in wind direction, so that the blade 120 has a large thrust with the wind and a small resistance against the wind during the rotation of the impeller module, and has a large thrust on one side and a small resistance on the other side, thereby maximizing the utilization of mechanical energy, better adapting to airflow, improving wind energy utilization, and reducing the wind turbine.

[0023] See also Figure 1 to Figure 2 Preferably, the blade 120 is divided into a first sub-blade 121 and a second sub-blade 122 with the axis of the rotating shaft 130 as a dividing line, and the width of the first sub-blade 121 is greater than the width of the second sub-blade 122. In this way, under wind force, the force on the first sub-blade 121 is greater than the force on the second sub-blade 122, so that the blade 120 can rotate around the rotating shaft 130 to change the angle to adapt to the wind direction. At the same time, when the impeller module rotates clockwise to the top of the dividing line 101, the second force-bearing surface 124 of the blade 120 is acted upon by the wind force, and the force on the first sub-blade 121 is greater than the force on the second sub-blade 122. The blade 120 can rotate clockwise around the rotating shaft 130 to a position parallel to the wind direction, thereby reducing resistance.

[0024] It should be noted that in severe weather with strong winds and very high wind speeds, wind turbines may suffer various degrees of damage. The stability and safety of the equipment should be ensured during the installation, maintenance and operation of wind turbines.

[0025] See also Figure 1 , Figure 8 as well as Fig. 9 In order to improve the safety of the wind turbine in strong wind weather, preferably, the block 140 is retractably arranged on the frame 110, so that the block 140 has a blocking state and a releasing state. In the blocking state, the blade 120 covers the block 140; when the block 140 is subjected to excessive pressure from the blade 120, the block 140 changes from the blocking state to the releasing state; in the releasing state, the blade 120 is released by the block 140 to a free state. Specifically, the block 140 can serve as an automatic protection device for the wind turbine of the present invention. In severe weather with strong winds, the blades 120 can be squeezed by the strong wind pressure to squeeze the block 140, so that the block 140 changes from a blocking state to a released state, so that the block 140 unloads the force on the blades 120, and the blades 120 are in a free state and swing along the wind direction or are parallel to the wind direction, so that the block 140 cannot provide resistance to the blades 120, and the thrust of the wind on the blades 120 is instantly reduced, and the rotation speed of the impeller module gradually stops, thereby preventing the impeller module from rotating too fast to cause damage to the parts of the generator module 200, thereby improving the safety of the wind turbine.

[0026] See also Figure 1 , Figure 8 as well as Fig. 9Preferably, in the blocking state, the distance between the block 140 and the rotating shaft 130 is less than the width of the first sub-blade 121, and the distance between the block 140 and the rotating shaft 130 is greater than the width of the second sub-blade 122; in the releasing state, the distance between the block 140 and the rotating shaft 130 is greater than the width of the first sub-blade 121, and the distance between the block 140 and the rotating shaft 130 is greater than the width of the second sub-blade 122. In this way, when the block 140 is in the blocking position, the block 140 can avoid the rotation of the second sub-blade 122 in the blade 120 and can block the continued rotation of the first sub-blade 121, ensuring that the blade 120 can utilize the impact of the airflow to adaptively change the angle to the optimal angle at different positions as the impeller module rotates, thereby improving the utilization rate of wind energy. When the block 140 is in the releasing position, the block 140 can release the rotation of the first sub-blade 121 and the second sub-blade 122, so that the wind turbine automatically starts the protection mechanism in strong wind weather.

[0027] See also Figure 1 , Figure 8 as well as Fig. 9 Preferably, a fixing block 300 is further provided on the frame 110 , a receiving groove 311 is provided in the fixing block 300 , a spring 320 is provided in the receiving groove 311 , and the spring 320 is provided between the stopper 140 and the inner wall of the fixing block 300 away from the stopper 140 . Specifically, the elastic force of the spring 320 is set according to the local wind force and the bearing capacity of the internal parts of the wind turbine. When the block 140 is in the blocking state, the spring 320 is in the initial state without elastic force; when the strong wind force exceeds the pre-calculated limit value, the wind turbine automatically starts the protection mechanism through the block 140, the block 140 is squeezed by the blade 120, the spring 320 is compressed and deformed, the block 140 is turned to the released state and retracted into the accommodating groove 311, the blade 120 is released to a free state, and the blade 120 swings with the wind at this time, so that the thrust provided by the blade 120 to the rotation of the impeller module is reduced, and the rotation of the impeller module approaches to stop, and finally the spring 320 rebounds to drive the block 140 to return to the blocking state. When the impeller module rotates again, as long as the strong wind force is less than the pre-calculated limit value, the blade 120 can still cover the block 140 to provide thrust when it is downwind, without manual maintenance. In this way, the wind turbine can automatically start the protection mechanism under strong wind, improve the wind resistance of the wind turbine, and increase the service life. Of course, the block 140 can also be set to be retracted into the receiving groove 311 at one time, for example: a plastic strip or steel bar with greater strength is set in the receiving groove 311 and connected to the block 140. When the pressure of the blade 120 on the block 140 exceeds the pre-calculated limit value, the plastic strip or steel bar directly breaks, so that the block 140 directly releases the blade 120, and loses the effect of causing resistance to the blade 120, so that the blade 120 swings freely with the wind and is converted into a free state.

[0028] See also Figures 8 to 9 To ensure that the stopper 140 can slide smoothly, preferably, a guide groove 141 is provided on the stopper 140, and a convex strip 330 is provided in the receiving groove 311 of the fixing block 300, and the stopper 140 can slide in the receiving groove 311 through the convex strip 330 and the guide groove 141. In this way, the stopper 140 can slide in the guide groove 141 through the convex strip 330, ensuring the stability of the stopper 140 when sliding from the blocking state to the releasing state. At the same time, in order to facilitate the blade 120 to push the stopper 140 to slide, the stopper 140 can be set with a round head, and the cross section of the stopper 140 is preferably set to be fan-shaped.

[0029] The blade 120 can be in various shapes, such as a rectangular plate or a square plate. Figure 1 , the blade 120 is in the shape of a rectangular plate. In this way, when the impeller module rotates clockwise, the blade 120 on the right side of the dividing line 101 is completely parallel to the direction of the external force to reduce resistance, and the blade 120 on the left side of the dividing line 101 ensures the driving force of the wind on the blade 120, so that the wind drives the blade 120 to drive the entire impeller module to rotate and generate electricity.

[0030] To ensure that the force on the first sub-blade 121 is greater than the force on the second sub-blade 122, preferably, refer to Figure 1 , the first sub-blade 121 is 1 / 3 of the blade 120, and the second sub-blade 122 is 2 / 3 of the blade 120. In this way, under wind force, in each blade 120, the first sub-blade 121 bears 1 / 3 of the force, and the second sub-blade 122 bears 2 / 3 of the force, so that the force on the blade 120 on both sides of the rotation axis 130 is uneven, and the blade 120 can be well adaptively rotated at a variable angle. Of course, in other embodiments, the first sub-blade 121 can also be a 1 / 4 blade 120, and the second sub-blade 122 can be a 3 / 4 blade 120, and it is only necessary to ensure the adaptive variable angle rotation of the blade 120. In this solution, the first sub-blade 121 and the second sub-blade 122 are both in the shape of a rectangular plate.

[0031] The number of blades 120 is not limited. To increase the thrust of the impeller module and reduce resistance, preferably, the number of blades 120 is 3 or 4. In this solution, the number of blades 120 is 3.

[0032] See also Figure 1 to Figure 2Preferably, the frame 110 includes an impeller shaft 111 and a plurality of rotating arms 112 fixedly connected to the side wall of the impeller shaft 111, the impeller shaft 111 is rotatably connected to the generator module 200, and the plurality of rotating arms 112 are evenly arranged along the circumferential direction of the impeller shaft 111, and a rotating shaft 130 is installed on each rotating arm 112. Specifically, under the impetus of wind, the blades 120 drive the rotating arms 112 and the impeller shaft 111 to rotate relative to the generator module 200, so that the generator module 200 generates electricity. In this embodiment, the angle formed between each rotating arm 112 is 120 degrees. In this way, each rotating arm 112 is evenly arranged at intervals, maintaining a suitable density of each rotating arm 112, and preventing the rotating arms 112 from being densely arranged to weaken the force of the fluid flow during the rotation of the rotating arms 112. The angle between each rotating arm 112 depends on the number of rotating arms 112. For example, when the number of rotating arms 112 is four, the angle between each rotating arm 112 is 90 degrees. In order to ensure the structural strength between the rotating arms 112, preferably, a first reinforcing bar 113 is connected between each rotating arm 112, and a second reinforcing bar 114 is connected between each rotating arm 112 and the impeller shaft 111. Using the principle of triangle stability, the first reinforcing bar 113 is used to reinforce the structural strength of the horizontal connection between the rotating arms 112, and the second reinforcing bar 114 is used to reinforce the structural strength of the vertical connection between the rotating arm 112 and the impeller shaft 111, so as to ensure overall stability. Both the first reinforcing bar 113 and the second reinforcing bar 114 can be arranged in a long strip shape to reinforce the connection strength between the rotating arm 112 and the impeller shaft 111.

[0033] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A wind turbine with blade adaptive angle-changing function, characterized in that: include: A frame, on which a generator module is installed; An impeller module, comprising a frame and a plurality of blades, wherein the frame is rotatably connected to the generator module, a plurality of rotating shafts are mounted on the frame, a plurality of blades are rotatably connected to the plurality of rotating shafts one by one, the blades have a first force-bearing surface and a second force-bearing surface, a stopper is arranged on the frame, and the stopper can block one side of the blade; Along the wind direction, the symmetry line of the rack is used as the dividing line; When the blade is on the first side of the dividing line, the first force-bearing surface faces the wind direction, and the blade is pressed against the block by the wind force; when the blade is close to the top of the dividing line, the force-bearing surface of the blade is switched from the first force-bearing surface to the second force-bearing surface, the blade is flipped around the rotation axis by the wind force, and the blade is parallel to the wind direction; when the blade is on the second side of the dividing line, the blade is parallel to the wind direction; when the blade is close to the bottom of the dividing line, the first force-bearing surface faces the wind direction, and the blade is pressed against the block by the wind force.

2. The wind turbine with blade adaptive angle-changing function according to claim 1, characterized in that: The blade is divided into a first sub-blade and a second sub-blade with the axis of the rotating shaft as a dividing line, and the width of the first sub-blade is greater than the width of the second sub-blade.

3. The wind turbine with blade adaptive angle-changing function as claimed in claim 2, characterized in that: The block is telescopically arranged on the frame, so that the block has a blocking state and a releasing state. In the blocking state, the blade covers the block; when the block is subjected to excessive pressure from the blade, the block changes from the blocking state to the releasing state; in the releasing state, the blade is released by the block to a free state.

4. The wind turbine with blade adaptive angle-changing function as claimed in claim 3, characterized in that: In the blocking state, the distance between the block and the rotation axis is smaller than the width of the first sub-blade, and the distance between the block and the rotation axis is larger than the width of the second sub-blade; in the releasing state, the distance between the block and the rotation axis is larger than the width of the first sub-blade, and the distance between the block and the rotation axis is larger than the width of the second sub-blade.

5. The wind turbine with blade adaptive angle-changing function as claimed in claim 4, characterized in that: The frame is also provided with a fixing block, a receiving groove is provided in the fixing block, a spring is provided in the receiving groove, and the spring is provided between the stop block and an inner wall of the fixing block on a side away from the stop block.

6. The wind turbine with blade adaptive angle-changing function as claimed in claim 5, characterized in that: The stopper is provided with a guide groove, and the fixing block is provided with a convex strip in the receiving groove. The stopper can slide in the receiving groove by adapting the convex strip to the guide groove.

7. The wind turbine with blade adaptive angle changing function according to any one of claims 2 to 6, characterized in that: The blade is in the shape of a rectangular plate.

8. The wind turbine with blade adaptive angle-changing function as claimed in claim 7, characterized in that: The first sub-leaf is a 1 / 3 blade, and the second sub-leaf is a 2 / 3 blade.

9. The wind turbine with blade adaptive angle-changing function as claimed in claim 8, characterized in that: The number of the blades is 3 or 4.

10. The wind turbine with blade adaptive angle-changing function as claimed in claim 9, characterized in that: The frame includes an impeller shaft and a plurality of rotating arms fixedly connected to the side wall of the impeller shaft. The impeller shaft is rotatably connected to the generator module. The plurality of rotating arms are evenly arranged along the circumference of the impeller shaft, and the rotating shaft is mounted on each rotating arm.

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