Wind turbine tower welding aid
By designing an auxiliary device for welding wind turbine towers, which utilizes components such as electric push rods, rotating wheels, and clamping rods to achieve automatic alignment and fixation, the problems of low efficiency and safety hazards in existing technologies have been solved, thereby improving welding efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- MCC HEAVY IND (XINJIANG) CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-04-28
AI Technical Summary
Existing auxiliary welding devices for wind turbine towers require manual alignment and fixing, resulting in low efficiency and safety hazards.
A welding auxiliary device for wind turbine towers was designed, including a base, a clamping device, a rotating device, and a loading and unloading device. The device utilizes components such as electric push rods, rotating wheels, and clamping rods to achieve automatic alignment and fixation, thereby improving welding efficiency and safety.
Stable welding of wind turbine towers has been achieved, avoiding positional shifts and misalignments, and improving welding efficiency and safety.
Smart Images

Figure CN120772758B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of auxiliary equipment technology for wind turbine tower welding, specifically to auxiliary devices for wind turbine tower welding. Background Technology
[0002] The wind turbine tower is the core support structure of a wind turbine generator set. It primarily connects the foundation ring to the nacelle, bears the weight of the blades, generator, and other equipment, and elevates the turbine to the optimal wind energy capture height. It plays a crucial role in support, height adjustment, and vibration damping design.
[0003] Existing auxiliary welding devices for wind turbine towers typically require manual alignment for weld seam joining and clamping. This consumes a significant amount of manpower and time, reducing the efficiency of wind turbine tower welding. Furthermore, manual weld seam joining cannot guarantee worker safety, increasing the risk of accidents. Summary of the Invention
[0004] The purpose of this invention is to provide a welding auxiliary device for wind turbine towers to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:
[0006] The present invention is a welding auxiliary device for wind turbine towers, including a base, a support plate fixedly connected to the surface of the base, a clamping device provided on the top of the base, a rotating device provided on the surface of the base, and a loading and unloading device provided on the top of the base.
[0007] The clamping device includes a first electric push rod, the surface of which is fixedly connected to the inner wall of the support plate. A push rod is fixedly connected to the end of the first electric push rod, and a push plate is fixedly connected to the end of the push rod. A telescopic rod is fixedly connected to the surface of the base, and an outer wall of a slide rail is fixedly connected to the surface of the base. An inner wall of the slide rail is slidably connected to the inner wall of the slide rail. A support block is fixedly connected to the end of the inner wall of the slide rail away from the outer wall of the slide rail. A placement frame is fixedly connected to the end of the push plate away from the support block. A slide rail is fixedly connected to the top of the base, and a pulley is fixedly connected to the bottom of the placement frame. A groove is formed on the top of the placement frame.
[0008] Furthermore, the placement frame is located above the slide rail, the surface of the pulley is slidably connected to the inner wall of the slide rail, the surface of the pulley is adapted to the inner wall of the slide rail, the support block is located above the inner wall of the slide rail, and the push plate is located above the telescopic rod.
[0009] Furthermore, the telescopic rod is located above the outer wall of the slide rail, and there are two placement racks. The end of the telescopic rod away from the base is fixedly connected to the surface of the push plate, and the end of the push plate away from the placement rack is fixedly connected to the inner wall of the slide rail.
[0010] Furthermore, the rotating device includes a sliding plate, the end of which is slidably connected to the inner wall of the channel. A welding robot is mounted on the top of the sliding plate. A rotating rod is fixedly connected to the top of the placement frame. A rotating wheel is rotatably connected to the surface of the rotating rod. A rotating support rod is fixedly connected to the top of the placement frame. A friction wheel is rotatably connected to the surface of the rotating support rod. A circular tooth is fixedly connected to the surface of the friction wheel. A pull rod is fixedly connected to the surface of the push rod away from the first electric push rod. A rack is fixedly connected to the end of the pull rod. A wind turbine tower is mounted on the surface of the rotating wheel.
[0011] Furthermore, the surface of the wind turbine tower is in contact with the surface of the rotating wheel, the surface of the rack meshes with the surface of the round tooth, there are several rotating wheels, the pull rod is located above the push rod, and the wind turbine tower is located above the placement frame.
[0012] Furthermore, the loading and unloading device includes a support plate, the bottom of which is fixedly connected to the top of a support block. A motor is fixedly connected to the inner wall of the support plate, and a rotating rod is fixedly connected to the output end of the motor. A support ring is fixedly connected to the surface of the rotating rod, and a support round seat is rotatably connected to the inner wall of the support ring. A cylinder is fixedly connected to the top of the support round seat, and an elongated plate is fixedly connected to the end of the cylinder away from the support round seat. A flexible rod is fixedly connected to the surface of the elongated plate, and a clamping rod is fixedly connected to the end of the flexible rod away from the elongated plate. A support ring block is fixedly connected to the surface of the clamping rod, and a rubber pad is fixedly connected to the surface of the clamping rod. A sliding groove is fixedly connected to the surface of the rotating rod, and a support plate is fixedly connected to the surface of the sliding groove. A second electric push rod is fixedly connected to the inner wall of the support plate, and a sliding pull rod is fixedly connected to the end of the second electric push rod. An inclined plate is hinged to the top of the sliding pull rod, and a pressure block is hinged to the end of the inclined plate away from the sliding pull rod. A retractable pull rod is fixedly connected to the bottom of the sliding pull rod.
[0013] Furthermore, the pressure block is located above the elongated plate, the end of the retracting rod away from the sliding rod is fixedly connected to the surface of the clamping rod, there are several rubber pads, and the sliding groove is located above the cylinder.
[0014] Furthermore, the flexible rod is located close to the two support ring blocks, the end of the support ring away from the rotating rod is fixedly connected to the surface of the push plate, the support plate is located above the support block, and the rotating rod passes through the support ring and extends to the outer end of the rotating rod.
[0015] The present invention has the following beneficial effects:
[0016] The present invention places the frame inside the slide rail for movement, which fixes the machine to wind turbine towers of different sizes, making it more stable during welding and avoiding positional displacement. When the push plates move away from each other, they will cause the inner wall of the slide rail to extend and retract outward, allowing it to move a greater distance and avoiding misalignment during movement that would affect the normal operation of the machine.
[0017] In this invention, the friction wheel rotates on the surface of the rotating support rod, causing the wind turbine tower located above the rotating rod to rotate. The rotation of the rotating wheel on the surface of the rotating rod makes the wind turbine tower on its surface more stable during rotation, preventing it from moving out of the machine and causing damage. At the same time, it makes welding the wind turbine tower more convenient, thereby improving the working efficiency of the machine.
[0018] When the second electric actuator is activated, the output end of this invention drives the sliding rod to slide inside the slide groove, allowing for better clamping of wind turbine towers of different sizes. The left and right movement of the clamping rod facilitates size adjustment, saving considerable time and improving machine efficiency. The movement of the clamping rod also stretches the flexible rod, ensuring stability and preventing misalignment due to uneven weight distribution. The support ring blocks support the flexible rod, preventing collapse and ensuring stability. The pressure block compresses the wind turbine tower, ensuring better adhesion between the inner wall and the rubber pad, making the machine safer and more stable during tower lifting and lowering operations. The support plate moves together with the inner wall of the slide rail, preventing jamming during operation.
[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;
[0022] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention;
[0023] Figure 3 This is a schematic diagram of the clamping device structure of the present invention;
[0024] Figure 4For the present invention Figure 3 Enlarged structural diagram of section A in the middle;
[0025] Figure 5 This is another structural schematic diagram of the clamping device of the present invention;
[0026] Figure 6 This is a schematic diagram of the rotating device structure of the present invention;
[0027] Figure 7 This is another structural schematic diagram of the rotating device of the present invention;
[0028] Figure 8 This is a schematic diagram of the loading and unloading device of the present invention;
[0029] Figure 9 This is another structural schematic diagram of the loading and unloading device of the present invention.
[0030] The attached diagram lists the components represented by each number as follows:
[0031] In the diagram: 1. Base; 2. Support plate; 3. Clamping device; 4. Rotating device; 5. Loading / unloading device; 20. First electric push rod; 21. Push rod; 22. Push plate; 23. Outer wall of slide rail; 24. Telescopic rod; 25. Placement rack; 26. Channel; 27. Inner wall of slide rail; 28. Support block; 29. Slide rail; 30. Pulley; 40. Sliding plate; 41. Welding robot; 42. Wind turbine tower; 43. Rotating rod; 44. Rotating wheel; 45. Pulling rod. 46. Rack; 47. Friction wheel; 48. Circular tooth; 49. Rotating strut; 50. Support plate; 51. Motor; 52. Rotating rod; 53. Support ring; 54. Support round seat; 55. Cylinder; 56. Long plate; 57. Slide groove; 58. Support plate; 59. Second electric push rod; 60. Sliding pull rod; 61. Inclined plate; 62. Pressure block; 63. Retractable pull rod; 64. Clamping rod; 65. Rubber pad; 66. Flexible rod; 67. Support ring block. Detailed Implementation
[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0033] Please see Figures 1-9 As shown, the present invention is a welding auxiliary device for wind turbine towers, including a base 1, a support plate 2 fixedly connected to the surface of the base 1, a clamping device 3 provided on the top of the base 1, a rotating device 4 provided on the surface of the base 1, and a loading and unloading device 5 provided on the top of the base 1.
[0034] The clamping device 3 includes a first electric push rod 20. When the first electric push rod 20 is activated, its output end drives the push plate 22 to move left and right via the push rod 21. At this time, the push plate 22 will push the placement frame 25 to move inside the slide rail 29 by squeezing, so that the machine can fix wind turbine towers of different sizes, making them more stable during welding and avoiding positional displacement. The surface of the first electric push rod 20 is fixedly connected to the inner wall of the support plate 2, and the end of the first electric push rod 20 is fixedly connected to the push rod 21. The end of the push rod 21 is fixedly connected to the push plate 22. When the push plates 22 move away from each other, they will drive the inner wall 27 of the slide rail to extend and retract outward, so that the movement distance is greater. At the same time, the telescopic rod 24 limits its position to prevent excessive movement. To prevent misalignment during the process that could affect the normal operation of the machine, a telescopic rod 24 is fixedly connected to the surface of the base 1, and an outer wall 23 of the slide rail is fixedly connected to the surface of the base 1. An inner wall 27 of the slide rail is slidably connected to the inner wall 23 of the slide rail. A support block 28 is fixedly connected to the end of the inner wall 27 of the slide rail away from the outer wall 23 of the slide rail. A placement frame 25 is fixedly connected to the end of the push plate 22 away from the support block 28. A groove 26 is provided on the top of the placement frame 25 so that the welding robot 41 can move inside it through the sliding plate 40, making it more convenient to weld the wind turbine tower. A slide rail 29 is fixedly connected to the top of the base 1, and a pulley 30 is fixedly connected to the bottom of the placement frame 25. A groove 26 is provided on the top of the placement frame 25.
[0035] The placement rack 25 is located above the slide rail 29. The surface of the pulley 30 is slidably connected to the inner wall of the slide rail 29. The surface of the pulley 30 is adapted to the inner wall of the slide rail 29. The support block 28 is located above the inner wall 27 of the slide rail. The push plate 22 is located above the telescopic rod 24.
[0036] The telescopic rod 24 is located above the outer wall 23 of the slide rail. There are two placement racks 25. The end of the telescopic rod 24 away from the base 1 is fixedly connected to the surface of the push plate 22. The end of the push plate 22 away from the placement rack 25 is fixedly connected to the inner wall of the inner wall 27 of the slide rail.
[0037] The rotating device 4 includes a sliding plate 40, the end of which is slidably connected to the inner wall of the channel 26. A welding robot 41 is mounted on the top of the sliding plate 40. A rotating rod 43 is fixedly connected to the top of the placement frame 25. A rotating wheel 44 is rotatably connected to the surface of the rotating rod 43. The rotating wheel 44 rotates on the surface of the rotating rod 43, making the wind turbine tower on its surface more stable during rotation and preventing it from being moved out of the machine and causing damage. A rotating support rod 49 is fixedly connected to the top of the placement frame 25. A friction wheel 47 is rotatably connected to the surface of the rotating support rod 49. A circular tooth 48 is fixedly connected to the surface of the friction wheel 47. A pull rod 45 is fixedly connected to the surface of the push rod 21 away from the first electric push rod 20. The pull rod 45 drives the rack 46 to drive the circular tooth 48 to rotate. The circular tooth 48 causes the friction wheel 47 to rotate on the surface of the rotating support rod 49, causing the wind turbine tower located above the rotating rod 43 to rotate. A rack 46 is fixedly connected to the end of the pull rod 45. A wind turbine tower 42 is mounted on the surface of the rotating wheel 44.
[0038] The surface of the wind turbine tower 42 contacts the surface of the rotating wheel 44, the surface of the rack 46 meshes with the surface of the round tooth 48, there are several rotating wheels 44, the pull rod 45 is located above the push rod 21, and the wind turbine tower 42 is located above the placement frame 25.
[0039] The loading and unloading device 5 includes a support plate 50, which moves together with the inner wall 27 of the slide rail to avoid jamming during machine operation. The bottom of the support plate 50 is fixedly connected to the top of the support block 28. A motor 51 is fixedly connected to the inner wall of the support plate 50. When the motor 51 is turned on, its output end drives the support round seat 54 to rotate inside the support ring 53 through the rotating rod 52. The output end of the motor 51 is fixedly connected to the rotating rod 52, which drives the slide groove 57 to rotate. When the second electric push rod 59 is turned on, its output end drives the sliding pull rod 60 to rotate. The groove 57 slides inside, allowing for better clamping of wind turbine towers of different sizes. A support ring 53 is fixedly connected to the surface of the rotating rod 52. A support round seat 54 is rotatably connected to the inner wall of the support ring 53. A cylinder 55 is fixedly connected to the top of the support round seat 54. An elongated plate 56 is fixedly connected to the end of the cylinder 55 away from the support round seat 54. A flexible rod 66 is fixedly connected to the surface of the elongated plate 56. A clamping rod 64 is fixedly connected to the end of the flexible rod 66 away from the elongated plate 56. When the clamping rod 64 moves, it stretches the flexible rod 66. It is more stable during movement, avoiding misalignment caused by uneven weight distribution. A support ring block 67 is fixedly connected to the surface of the clamping rod 64, which supports the flexible rod 66 to prevent it from collapsing and thus losing its stability. A rubber pad 65 is fixedly connected to the surface of the clamping rod 64. A sliding groove 57 is fixedly connected to the surface of the rotating rod 52. A support plate 58 is fixedly connected to the surface of the sliding groove 57. A second electric push rod 59 is fixedly connected to the inner wall of the support plate 58. A sliding pull rod 60 is fixedly connected to the end of the second electric push rod 59. When the rod 60 moves, it drives the clamping rod 64 to move left and right through the retracting rod 63, making the size adjustment more convenient and saving a lot of time, thereby improving the working efficiency of the machine. The top of the sliding rod 60 is hinged with an inclined plate 61. Pressing the inclined plate 61 causes the pressure block 62 to press against the wind turbine tower, making its inner wall more fully adhered to the rubber pad 65, making the machine safer and more stable when working up and down on the wind turbine tower. The end of the inclined plate 61 away from the sliding rod 60 is hinged with a pressure block 62, and the bottom of the sliding rod 60 is fixedly connected with the retracting rod 63.
[0040] The pressure block 62 is located above the elongated plate 56. The end of the retractable rod 63 away from the sliding rod 60 is fixedly connected to the surface of the clamping rod 64. There are several rubber pads 65. The slide groove 57 is located above the cylinder 55.
[0041] The flexible rod 66 is located close to the two support ring blocks 67. The end of the support ring 53 away from the rotating rod 52 is fixedly connected to the surface of the push plate 22. The support plate 50 is located above the support block 28. The rotating rod 52 passes through the support ring 53 and extends to the outer end of the rotating rod 52.
[0042] In operation, when the first electric actuator 20 is activated, the output end drives the push plate 22 to move left and right via the push rod 21. At this time, the push plate 22, through compression, drives the placement frame 25 to move inside the slide rail 29, thus fixing the wind turbine towers of different sizes and making them more stable during welding, preventing positional displacement. When the push plates 22 move away from each other, they cause the inner wall 27 of the slide rail to extend and retract outward, increasing the moving distance. Simultaneously, the telescopic rod 24 limits its position, preventing misalignment during movement and ensuring normal machine operation. When the first electric actuator 20 drives the push plate 22 to move left and right... When rod 21 moves, push rod 21 drives rack 46 to rotate circular gear 48 via pull rod 45. Circular gear 48 causes friction wheel 47 to rotate on the surface of rotating support rod 49, causing the wind turbine tower located above rotating rod 43 to rotate. At this time, rotating wheel 44 rotates on the surface of rotating rod 43, making the wind turbine tower on its surface more stable during rotation, preventing it from moving outside the machine and causing damage. This also makes welding the wind turbine tower more convenient, thus improving the machine's working efficiency. The top of the placement frame 25 has a groove 26, allowing the welding robot 41 to pass through the sliding plate 40 within it. The movement of the part makes welding wind turbine towers more convenient. When the motor 51 is turned on, the output end drives the support round seat 54 to rotate inside the support ring 53 via the rotating rod 52. At the same time, the rotating rod 52 drives the slide groove 57 to rotate. When the second electric push rod 59 is turned on, the output end drives the sliding pull rod 60 to slide inside the slide groove 57, which allows for better clamping of wind turbine towers of different sizes. When the sliding pull rod 60 moves, it drives the clamping rod 64 to move left and right via the retracting rod 63, making size adjustment more convenient and saving a lot of time, thereby improving the machine's working efficiency. Efficiency is ensured by the following: when the clamping rod 64 moves, it stretches the flexible rod 66 to make it more stable during movement, avoiding misalignment caused by uneven weight distribution. The support ring block 67 supports the flexible rod 66 to prevent it from collapsing and thus achieving stability. When the sliding rods 60 approach each other, they compress the inclined plate 61 to make the pressure block 62 compress the wind turbine tower, making its inner wall adhere more fully to the rubber pad 65, making the machine safer and more stable when working up and down on the wind turbine tower. The support plate 50 moves together with the inner wall 27 of the slide rail to avoid jamming problems during machine operation.
[0043] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims
1. A welding auxiliary device for wind turbine towers, comprising a base (1), characterized in that: The base (1) is fixedly connected to a support plate (2), the top of the base (1) is provided with a clamping device (3), the surface of the base (1) is provided with a rotating device (4), and the top of the base (1) is provided with a loading and unloading device (5). The clamping device (3) includes a first electric push rod (20), the surface of the first electric push rod (20) is fixedly connected to the inner wall of the support plate (2), the end of the first electric push rod (20) is fixedly connected to a push rod (21), the end of the push rod (21) is fixedly connected to a push plate (22), the surface of the base (1) is fixedly connected to a telescopic rod (24), the surface of the base (1) is fixedly connected to a slide rail outer wall (23), the inner wall of the slide rail outer wall (23) is slidably connected to a slide rail inner wall (27), the end of the slide rail inner wall (27) away from the slide rail outer wall (23) is fixedly connected to a support block (28), the end of the push plate (22) away from the support block (28) is fixedly connected to a placement frame (25), the top of the base (1) is fixedly connected to a slide rail (29), the bottom of the placement frame (25) is fixedly connected to a pulley (30), and the top of the placement frame (25) is provided with a groove (26). The rotating device (4) includes a sliding plate (40), the end of which is slidably connected to the inner wall of the channel (26), a welding robot (41) is provided on the top of the sliding plate (40), a rotating rod (43) is fixedly connected to the top of the placement frame (25), a rotating wheel (44) is rotatably connected to the surface of the rotating rod (43), a rotating support rod (49) is fixedly connected to the top of the placement frame (25), a friction wheel (47) is rotatably connected to the surface of the rotating support rod (49), a circular tooth (48) is fixedly connected to the surface of the friction wheel (47), a pull rod (45) is fixedly connected to the surface of the push rod (21) away from the first electric push rod (20), a rack (46) is fixedly connected to the end of the pull rod (45), and a wind turbine tower (42) is provided on the surface of the rotating wheel (44). The loading and unloading device (5) includes a support plate (50), the bottom of which is fixedly connected to the top of a support block (28). A motor (51) is fixedly connected to the inner wall of the support plate (50). A rotating rod (52) is fixedly connected to the output end of the motor (51). A support ring (53) is fixedly connected to the surface of the rotating rod (52). A support round seat (54) is rotatably connected to the inner wall of the support ring (53). A cylinder (55) is fixedly connected to the top of the support round seat (54). An elongated plate (56) is fixedly connected to the end of the cylinder (55) away from the support round seat (54). A flexible rod (66) is fixedly connected to the surface of the elongated plate (56). The flexible rod (66) is located away from the elongated plate (56). A clamping rod (64) is fixedly connected to the end of the clamping rod (64), a support ring block (67) is fixedly connected to the surface of the clamping rod (64), a rubber pad (65) is fixedly connected to the surface of the clamping rod (64), a sliding groove (57) is fixedly connected to the surface of the rotating rod (52), a support plate (58) is fixedly connected to the surface of the sliding groove (57), a second electric push rod (59) is fixedly connected to the inner wall of the support plate (58), a sliding pull rod (60) is fixedly connected to the end of the second electric push rod (59), an inclined plate (61) is hinged to the top of the sliding pull rod (60), a pressure block (62) is hinged to the end of the inclined plate (61) away from the sliding pull rod (60), and a retracting rod (63) is fixedly connected to the bottom of the sliding pull rod (60).
2. The wind turbine tower welding auxiliary device according to claim 1, characterized in that: The placement rack (25) is located above the slide rail (29), the surface of the pulley (30) is slidably connected to the inner wall of the slide rail (29), the surface of the pulley (30) is adapted to the inner wall of the slide rail (29), the support block (28) is located above the inner wall (27) of the slide rail, and the push plate (22) is located above the telescopic rod (24).
3. The wind turbine tower welding auxiliary device according to claim 2, characterized in that: The telescopic rod (24) is located above the outer wall (23) of the slide rail. There are two placement racks (25). The end of the telescopic rod (24) away from the base (1) is fixedly connected to the surface of the push plate (22). The end of the push plate (22) away from the placement rack (25) is fixedly connected to the inner wall (27) of the slide rail.
4. The wind turbine tower welding auxiliary device according to claim 3, characterized in that: The surface of the wind turbine tower (42) is in contact with the surface of the rotating wheel (44), the surface of the rack (46) meshes with the surface of the round tooth (48), there are several rotating wheels (44), the pull rod (45) is located above the push rod (21), and the wind turbine tower (42) is located above the placement frame (25).
5. The wind turbine tower welding auxiliary device according to claim 4, characterized in that: The pressure block (62) is located above the elongated plate (56), the end of the retractable rod (63) away from the sliding rod (60) is fixedly connected to the surface of the clamping rod (64), there are several rubber pads (65), and the slide groove (57) is located above the cylinder (55).
6. The wind turbine tower welding auxiliary device according to claim 5, characterized in that: The flexible rod (66) is located close to the two support ring blocks (67), the end of the support ring (53) away from the rotating rod (52) is fixedly connected to the surface of the push plate (22), the support plate (50) is located above the support block (28), and the rotating rod (52) passes through the support ring (53) and extends to the outer end of the rotating rod (52).
Citation Information
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