A clamping tool for welding a rear axle of an electric tricycle

Abstract

The utility model discloses a kind of clamping tool for electric tricycle rear axle welding, belong to electric tricycle rear axle welding technical field.It includes clamping structure, base, connecting portion, fixed frame and arc support frame, wherein, clamping structure includes upper support frame and bottom support frame, the bridge pipe and bridge package of rear axle can be clamped together simultaneously, synchronous displacement is realized, base is set on base, fixed frame is fixedly connected with connecting portion front end, fixed frame has elevation, arc support frame passes through the inner frame mouth of fixed frame, and its two arc ends are connected to the rear end face of upper support frame and bottom support frame respectively.The utility model clamps the bridge pipe and bridge package of rear axle together simultaneously by clamping structure, so that bridge pipe and bridge package can rotate synchronously, avoid the damage caused by the relative displacement between bridge pipe and bridge package when switching welding to weld, improve the welding performance of electric tricycle rear axle.

Description

Technical Field

[0001] This utility model relates to the field of welding technology for the rear axle of electric tricycles, and specifically to a clamping fixture for welding the rear axle of electric tricycles. Background Technology

[0002] Electric tricycles are three-wheeled transportation vehicles powered by batteries and driven by motors, used for carrying goods or passengers. Their two rear wheels are typically connected by a rear axle to achieve both driving and load-bearing functions. The rear axle housing of an electric tricycle consists of two axle tubes and an axle housing located at the connection point between the two axle tubes. During manufacturing, these are usually connected by welding. Clamping fixtures are required during the welding process to ensure the axle tubes and axle housing remain stationary.

[0003] Existing clamping fixtures typically clamp and fix the axle tube and axle coil separately before welding. This clamping method has significant drawbacks: after the welder completes welding the axle tube and axle coil, the clamping fixture needs to be loosened and the position manually adjusted to improve welding efficiency. However, at this time, the heat-affected zone around the welded seam has undergone complex thermal cycles, altering its internal structure and properties, resulting in a decrease in its toughness and plasticity. During position adjustment, the incompletely welded rear axle is highly susceptible to uneven stress, such as relative displacement of the unwelded portions of the axle tube and axle coil, leading to defects such as cracks in the heat-affected zone, severely affecting the overall structural integrity.

[0004] Therefore, this utility model proposes a clamping fixture for welding the rear axle of an electric tricycle. Summary of the Invention

[0005] To address the aforementioned technical deficiencies, the purpose of this utility model is to provide a clamping fixture for welding the rear axle of an electric tricycle.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a clamping fixture for welding the rear axle of an electric tricycle, including a clamping structure, the clamping structure including an upper support frame and a bottom support frame, which can simultaneously clamp the axle tube and axle housing of the rear axle together to achieve synchronous displacement; a base and a connecting part disposed on the base, the front end of the connecting part being fixedly connected to a fixing frame, the fixing frame having an elevation angle; an arc-shaped support frame, the arc-shaped support frame passing through the inner frame opening of the fixing frame, its two arc ends being respectively connected to the rear end faces of the upper support frame and the bottom support frame.

[0007] Preferably, the clamping structure further includes several threaded portions, which pass through and are threadedly connected to the upper support frame. A screwing portion is fixedly connected to the end of each threaded portion away from the rear axle, and a pad is rotatably connected to the end of each threaded portion near the rear axle. The pad abuts against the bridge tube and bridge housing of the rear axle. A spring is sleeved on the outside of each threaded portion, with its two ends abutting against the upper support frame and the pad. The clamping structure further includes several threaded portions, which pass through and are threadedly connected to the upper support frame. A screwing portion is fixedly connected to the end of each threaded portion away from the rear axle, and a pad is rotatably connected to the end of each threaded portion near the rear axle. The pad can tightly abut against the bridge tube and bridge housing. A spring is sleeved on the outside of each threaded portion, with its two ends abutting against the upper support frame and the pad.

[0008] Preferably, the bottom support frame is provided with a second support part and a first support part on the middle and both sides of the side near the rear axle. The second support part and the first support part are each provided with a second pad at the end near the rear axle. The second pad can be pressed against the axle tube and the axle package respectively.

[0009] Preferably, the support part one includes an outer rod and an inner rod. The outer rod is fixedly connected to the bottom support frame. The end of the inner rod near the outer rod has a thread. The inner rod is screwed into the inside of the outer rod through the thread. The end of the inner rod away from the outer rod is rotatably connected to the pad part two.

[0010] Preferably, an arc-shaped rack is fixedly connected to the outer arc surface of the arc-shaped support frame, and a gear meshing with the arc-shaped rack is provided behind it. The gear is driven by a drive assembly. Several evenly distributed through holes are opened on the side of the arc-shaped support frame, and the through holes and the fixed frame are connected by a limit structure.

[0011] Preferably, the limiting structure includes a pin with a handle, and a through groove is provided on the side of the fixing frame. The pin is used to connect the through groove and one of the through holes to complete the fixation. A second spring is sleeved on the outside of the pin. Both ends of the second spring are fixedly connected to limiting blocks. The limiting block on the side away from the pin handle is fixedly connected to the pin, and the limiting block on the side closer to the pin handle is fixedly connected to the through groove.

[0012] Preferably, the drive assembly includes a motor, the output shaft of the motor is fixedly connected to a gear, a motor base is fixedly connected to the bottom of the motor, and the motor base is fixedly connected to a base.

[0013] Preferably, the drive assembly includes a fixed disk and a rocker plate arranged sequentially on one side of the gear. A connecting shaft is fixedly connected to the gear, the connecting shaft passes through the fixed disk and is fixedly connected to the rocker plate, and the bottom of the fixed disk has an extension portion that extends downward and is fixedly connected to the base.

[0014] Preferably, a limiting pin is inserted through the rocker plate, and the limiting pin has a thread on the side near the fixed plate. The fixed plate has a threaded hole for matching the thread of the limiting pin. When the thread of the limiting pin is screwed into the threaded hole on the fixed plate, the gear is fixed.

[0015] Preferably, the bottom of the bottom support frame has a convex surface, and the base is provided with a concave surface that cooperates with the convex surface. When the convex surface is fully in contact with the concave surface, the clamping fixture returns to its initial state.

[0016] The beneficial effects of this utility model are as follows: This invention uses an upper support frame and a lower support frame to clamp the rear axle from above and below the axle tube and axle housing, respectively. The upper support frame and the lower support frame are then connected by an arc-shaped support frame, allowing the axle tube and axle housing to move synchronously during movement. This ensures that the unwelded parts of the axle housing and axle tube remain relatively stationary, avoiding damage to the weld caused by the relative displacement between the axle tube and axle housing when switching welding points, and improving the welding performance of the rear axle of the electric tricycle.

[0017] This invention allows the arc-shaped support frame to pass through the inner frame opening of the fixed frame, enabling the arc-shaped support frame and its connected clamping structure to rotate relative to the base after clamping the rear axle. This eliminates the need for welders to loosen the clamping fixture and then adjust it, thus improving welding efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional structural diagram of a clamping fixture for welding the rear axle of an electric tricycle, provided in an embodiment of this utility model. Figure 1 .

[0020] Figure 2 A three-dimensional structural diagram of a clamping fixture for welding the rear axle of an electric tricycle, provided in an embodiment of this utility model. Figure 2 .

[0021] Figure 3 This is a side view structural diagram of a clamping fixture for welding the rear axle of an electric tricycle, provided as an embodiment of the present invention.

[0022] Figure 4This utility model provides a clamping fixture for welding the rear axle of an electric tricycle. Figure 1 Enlarged view of point A in the middle.

[0023] Figure 5 This utility model provides a clamping fixture for welding the rear axle of an electric tricycle. Figure 2 Enlarged view of point B in the middle.

[0024] Figure 6 This is a top cross-sectional view of the limiting structure of a clamping fixture for welding the rear axle of an electric tricycle, provided in an embodiment of this utility model.

[0025] Figure 7 This is a perspective view of the drive assembly of a clamping fixture for welding the rear axle of an electric tricycle, provided as an embodiment of the present invention.

[0026] Figure 8 An exploded perspective view of the drive assembly of a clamping fixture for welding the rear axle of an electric tricycle, provided in an embodiment of this utility model.

[0027] Explanation of reference numerals in the attached figures: 1. Upper support frame; 2. Bottom support frame; 3. Base; 4. Connecting part; 5. Fixing frame; 6. Arc-shaped support frame; 7. Threaded part; 8. Tightening part; 9. Pad part one; 10. Spring one; 11. Support part two; 12. Support part one; 13. Pad part two; 14. Outer rod; 15. Inner rod; 16. Arc-shaped rack; 17. Gear; 18. Through hole; 19. Pin; 20. Through groove; 21. Spring two; 22. Limiting block; 23. Motor; 24. Motor base; 25. Fixing plate; 26. Rocking plate; 27. Connecting shaft; 28. Limiting pin; 29. ​​Convex surface; 30. Concave surface. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1: like Figure 1As shown, this utility model provides a clamping fixture for welding the rear axle of an electric tricycle. The clamping fixture includes a clamping structure, a base 3, a connecting part 4, a fixing frame 5, and an arc-shaped support frame 6. The clamping structure includes an upper support frame 1 and a lower support frame 2. The connecting part 4 is mounted on the base 3, and the front end of the connecting part 4 is fixedly connected to the fixing frame 5, which has an upward angle. The arc-shaped support frame 6 passes through the inner frame opening of the fixing frame 5, and its two arc-shaped ends are respectively connected to the rear end faces of the upper support frame 1 and the lower support frame 2.

[0030] Therefore, in the specific implementation process of this embodiment, the upper support frame 1 and the bottom support frame 2 clamp the rear axle from above and below the axle tube and axle housing, respectively. The upper support frame 1 and the bottom support frame 2 are then connected by the arc-shaped support frame 6, so that the axle tube and axle housing can achieve synchronous displacement during movement. This ensures that the unwelded parts of the axle housing and axle tube remain relatively stationary, avoiding damage to the weld caused by the relative displacement between the axle tube and axle housing when switching welding points, and improving the welding performance of the electric tricycle rear axle.

[0031] Meanwhile, this embodiment also allows the arc-shaped support frame 6 to pass through the inner frame opening of the fixed frame 5, so that the arc-shaped support frame 6 and its connected clamping structure can rotate relative to the base 3 after clamping the rear axle. This eliminates the need for welders to loosen the clamping fixture and then make adjustments, thus improving welding efficiency.

[0032] Example 2: To further clarify and fully explain the clamping structure in Embodiment 1 above, this utility model also provides Embodiment 2, such as... Figures 1 to 4 As shown, in this second embodiment, the clamping structure also includes several threaded portions 7, which pass through and are threadedly connected to the upper support frame 1, for example... Figure 1 As shown, the upper support frame 1 has a convex design. The threaded part 7 is located on both sides and in the middle of the upper support frame 1. The end away from the rear axle is fixedly connected to the screwing part 8, and the end near the rear axle is rotatably connected to the pad part 9. The pad part 9 can be tightly abutted against the bridge tube and the bridge package respectively. The threaded part 7 is fitted with a spring 10. The two ends of the spring 10 abut against the upper support frame 1 and the pad part 9 respectively.

[0033] Meanwhile, support part 2 11 and support part 1 12 are respectively provided in the middle and on both sides of the bottom support frame 2 near the rear axle. Support part 2 11 and support part 1 12 correspond to the threaded part 7 mentioned above to achieve stable clamping. Support part 2 11 and support part 1 12 are respectively provided with pad part 2 13 at the end near the rear axle. Pad part 2 13 can be tightly abutted against the axle tube and axle package respectively.

[0034] Support part 12 includes an outer rod 14 and an inner rod 15. The outer rod 14 is fixedly connected to the bottom support frame 2. The end of the inner rod 15 near the outer rod 14 has a thread. The inner rod 15 is screwed into the inside of the outer rod 14 by the thread. The end of the inner rod 15 away from the outer rod 14 is rotatably connected to pad part 2 13.

[0035] Therefore, in the specific implementation of this embodiment 2, the bottom support frame 2 should first be placed horizontally, that is, the support part 12 is vertically upward. Then, the axle housing of the rear axle is placed on the support part 2 11 and the pad part 2 13 on it. Then, the screwing part 8 on the threaded part 7 in the middle of the support frame 1 is screwed on, and the pad part 1 9 connected to it is screwed on until it is in close contact with the axle housing, thus completing the fixation of the axle housing.

[0036] Subsequently, based on the specifications and size of the bridge tube, select one side of the support part 12, and screw the inner rod 15 relative to the outer rod 14 to adjust the height of the pad part 13 on the support part 12 to match the position of the bridge tube. After the weld seam of the bridge tube and the bridge housing is joined, screw the screw part 8 on the corresponding threaded part 7 on the support frame 1, so that the pad part 9 on that side is close to and tightly abuts against the bridge tube on that side, completing the fixation of the bridge tube on that side. The other side is the same. At this time, the bridge housing and the bridge tubes on both sides are fixed, and their weld joints remain relatively stationary. Welders can then operate the welding equipment to perform welding work on the rear axle of the electric tricycle.

[0037] Example 3: In the second embodiment described above, after the welding of some connection areas between the bridge tube and the bridge apron is completed, the position needs to be adjusted to complete the welding of the remaining connection areas. However, if the clamping of the bridge apron is loosened and its position adjusted at this time, it is very likely that the connection between the unwelded parts of the bridge tube and the bridge apron will be unstable, leading to weld cracks or even direct breakage, affecting the welding performance. To solve this problem, this utility model also proposes a third embodiment, such as... Figure 2 , Figure 3 As shown in Embodiment 3, in order to enable the arc-shaped support frame 6 to slide inside the fixed frame 5, an arc-shaped rack 16 is fixedly connected to the outer arc surface of the arc-shaped support frame 6. A gear 17 is provided behind the arc-shaped rack 16 and meshes with it. The gear 17 is fixed on a certain driving component, and the driving component provides driving force for the rotation of the gear 17. The arc-shaped rack 16 begins to displace relative to the gear 17 under the meshing action, thereby driving the arc-shaped support frame 6 to slide inside the fixed frame 5.

[0038] At this time, the angle of the arc-shaped support frame 6 relative to the base 3 changes. That is, the angle formed by the line connecting the upper support frame 1 and the bottom support frame 2 extending to the ground changes from the original right angle to an obtuse or acute angle. The bridge tube and bridge bundle held on it are rotated synchronously to facilitate the welder to adjust to the appropriate angle for the next welding work. Since the rotation of the bridge tube and bridge bundle is synchronous and there is no relative displacement between them, the force is uniform during the rotation. The unwelded parts remain firmly connected and will not cause uneven force during rotation as in the prior art.

[0039] Example 4: Based on Embodiment 3, when the aforementioned arc-shaped support frame 6 rotates to the designated position, it needs to be limited and fixed; otherwise, it is easy to cause stress during welding, thereby affecting the welding function. To achieve this, this utility model provides Embodiment 4. Figures 5 to 6 As shown, the side of the arc-shaped support frame 6 has several evenly distributed through holes 18, and the through holes 18 and the fixing frame 5 are connected by a limiting structure. In this embodiment, the limiting structure includes a pin 19 with a handle, and a through groove 20 is provided on the side of the fixing frame 5. The pin 19 is used to connect the through groove 20 and one of the through holes 18 to complete the fixation. Therefore, in the specific implementation of this embodiment, one of the through holes 18 on the arc-shaped support frame 6 needs to be rotated to coincide with the through groove 20 on the fixing frame 5 before the pin 19 can be inserted. At the same time, a second spring 21 is sleeved on the outside of the pin 19. Both ends of the second spring 21 are fixedly connected to limiting blocks 22. The limiting block 22 on the side away from the handle of the pin 19 is fixedly connected to the pin 19, and the limiting block 22 on the side closer to the handle of the pin 19 is fixedly connected to the through groove 20. Therefore, when the arc support frame 6 needs to be readjusted, the user only needs to pull the handle on the pin 19 to bring the two limit blocks 22 closer together and squeeze the spring 21. When the two limit blocks 22 are close to each other to the maximum, the pin 19 disengages from the through hole 18. At this time, the welder can adjust the rotation of the arc support frame 6 until the through hole 18 and the through groove 20 overlap at the target position. Then, release the handle. At this time, the pin 19 resets under the deformation of the spring 21 and re-engages.

[0040] Example 5: Based on Embodiment 3, in order to drive gear 17 to rotate smoothly, this utility model provides Embodiment 5, such as... Figure 2 , Figure 5 As shown, in embodiment five, the drive assembly includes a motor 23, the output shaft of the motor 23 is fixedly connected to a gear 17, and a motor base 24 is fixedly connected to the bottom of the motor 23, which is fixedly connected to the base 3.

[0041] In this embodiment, by controlling the motor 23 to rotate, the gear 17 can be rotated, thereby completing the adjustment of the arc-shaped support frame 6 in Embodiment 3.

[0042] Example 6: Based on Embodiment 3, compared to Embodiment 5, the rotation of motor 23 is more difficult to control when energized. Adding a controller or additional control structure may incur additional costs. Therefore, to reduce production costs, this utility model also provides Embodiment 6, such as... Figures 7 to 8 As shown, in Embodiment Six, the drive assembly includes a fixed disk 25 and a rocker disk 26 sequentially arranged on one side of the gear 17. A connecting shaft 27 is fixedly connected to the gear 17. The connecting shaft 27 passes through the fixed disk 25 (the connecting shaft 27 and the fixed disk 25 are rotatably connected) and is fixedly connected to the rocker disk 26. The bottom of the fixed disk 25 has an extension portion that extends downward and is fixedly connected to the base 3. A limiting pin 28 is inserted into the rocker disk 26. The limiting pin 28 has threads on the side near the fixed disk 25 and passes through the rocker disk 26. The fixed disk 25 has a threaded hole that matches the thread of the limiting pin 28.

[0043] Therefore, in the specific implementation of this sixth embodiment, when it is necessary to rotate gear 17, the welder should first unscrew the threaded part of the limiting pin 28 from the threaded hole on the fixed plate 25. Then, the welder should hold the limiting pin 28 by hand and shake the rocker 26 to rotate it. Driven by the connecting shaft 27, gear 17 rotates synchronously and engages with the adjustment rotation of the arc-shaped support frame 6. After rotating to the designated position, the limiting pin 28 is screwed back into the threaded hole on the fixed plate 25. At this time, gear 17 is fixed. Combined with the limiting structure in embodiment four, it can better provide support for the fixing of the arc-shaped support frame 6.

[0044] Finally, the bottom of the bottom support frame 2 has a convex surface 29, and the base 3 is provided with a concave surface 30 that cooperates with the convex surface 29. When the convex surface 29 is fully in contact with the concave surface 30, the clamping fixture returns to its initial state. That is, the line connecting the upper support frame 1 and the bottom support frame 2 is perpendicular to the bottom surface.

[0045] In summary, the clamping fixture for welding the rear axle of an electric tricycle provided by this utility model has at least the following advantages: Through the clamping structure, the linkage bridge tube and bridge package achieve synchronous displacement during movement, ensuring the relative stillness of the unwelded parts of the bridge package and bridge tube. This avoids damage to the weld caused by the relative displacement between the bridge tube and bridge package when switching welding points, and improves the welding performance of the rear axle of the electric tricycle.

[0046] By adjusting the threaded part 7, the second support part 11, and the first support part 12, the clamping structure of this utility model can be equipped with the ability to clamp bridge tubes and bridge packages of different specifications.

[0047] The designed limiting structure allows the arc-shaped support frame 6 to be stably fixed after adjustment and is easy to adjust, increasing the stability of the clamping structure during the welding process.

[0048] By designing different drive components, in conjunction with gear 17 and arc rack 16, the arc support frame 6 can be driven to rotate inside the fixed frame 5, thereby adjusting the position of the clamping structure and changing the position of the bridge tube or bridge package it clamps, so as to facilitate welding by the welder.

[0049] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A clamping fixture for welding the rear axle of an electric tricycle, characterized in that, include: The clamping structure includes an upper support frame (1) and a bottom support frame (2), which can simultaneously clamp the axle tube and axle package of the rear axle together to achieve synchronous displacement. The base (3) and its connecting part (4) are provided on the base (3), and a fixing frame (5) is fixedly connected to the front end of the connecting part (4), and the fixing frame (5) has an upward angle; An arc-shaped support frame (6) passes through the inner frame opening of the fixed frame (5), and its two arc ends are respectively connected to the rear end faces of the upper support frame (1) and the bottom support frame (2).

2. The clamping fixture for welding the rear axle of an electric tricycle as described in claim 1, characterized in that, The clamping structure also includes several threaded parts (7), which pass through and are threaded to the upper support frame (1). The end of the threaded part (7) away from the rear axle is fixedly connected to a screwing part (8), and the end of the threaded part (7) near the rear axle is rotatably connected to a pad part (9). The pad part (9) is in close contact with the bridge tube and the bridge package respectively. A spring (10) is sleeved on the outside of the threaded part (7), and the two ends of the spring (10) are in contact with the upper support frame (1) and the pad part (9) respectively.

3. The clamping fixture for welding the rear axle of an electric tricycle as described in claim 1, characterized in that, The bottom support frame (2) is provided with a support part two (11) and a support part one (12) on the middle and both sides of the side near the rear axle. The support part two (11) and the support part one (12) are provided with a pad part two (13) at the end near the rear axle. The pad part two (13) abuts against the bridge tube and the bridge package respectively.

4. The clamping fixture for welding the rear axle of an electric tricycle as described in claim 3, characterized in that, The support part one (12) includes an outer rod (14) and an inner rod (15). The outer rod (14) is fixedly connected to the bottom support frame (2). The inner rod (15) has a thread at one end near the outer rod (14). The inner rod (15) is screwed into the inside of the outer rod (14) by the thread. The end of the inner rod (15) away from the outer rod (14) is rotatably connected to the pad part two (13).

5. The clamping fixture for welding the rear axle of an electric tricycle as described in claim 1, characterized in that, An arc-shaped rack (16) is fixedly connected to the outer arc surface of the arc-shaped support frame (6). A gear (17) meshes with the arc-shaped rack (16) at the rear. The gear (17) is driven by a drive assembly. Several evenly distributed through holes (18) are opened on the side of the arc-shaped support frame (6). The through holes (18) and the fixed frame (5) are connected by a limit structure.

6. The clamping fixture for welding the rear axle of an electric tricycle as described in claim 5, characterized in that, The limiting structure includes a pin (19) with a handle. A through slot (20) is provided on the side of the fixing frame (5). The pin (19) is used to connect the through slot (20) and one of the through holes (18) to complete the fixation. A spring (21) is sleeved on the outside of the pin (19). Both ends of the spring (21) are fixedly connected to limiting blocks (22). The limiting block (22) on the side away from the handle of the pin (19) is fixedly connected to the pin (19), and the limiting block (22) on the side close to the handle of the pin (19) is fixedly connected to the through slot (20).

7. A clamping fixture for welding the rear axle of an electric tricycle as described in claim 5, characterized in that, The drive assembly includes a motor (23), the output shaft of the motor (23) and a gear (17) are fixedly connected, and a motor base (24) is fixedly connected to the bottom of the motor (23), and the motor base (24) is fixedly connected to the base (3).

8. The clamping fixture for welding the rear axle of an electric tricycle as described in claim 5, characterized in that, The drive assembly includes a fixed disk (25) and a rocker plate (26) arranged sequentially on one side of the gear (17). A connecting shaft (27) is fixedly connected to the gear (17). The connecting shaft (27) passes through the fixed disk (25) and is fixedly connected to the rocker plate (26). The bottom of the fixed disk (25) has an extension portion that extends downward and is fixedly connected to the base (3).

9. The clamping fixture for welding the rear axle of an electric tricycle as described in claim 8, characterized in that, A limiting pin (28) is inserted through the rocker plate (26). The limiting pin (28) has a thread on the side near the fixed plate (25). The fixed plate (25) has a threaded hole for matching the thread of the limiting pin (28). When the thread of the limiting pin (28) is screwed into the threaded hole on the fixed plate (25), the gear (17) is fixed.

10. The clamping fixture for welding the rear axle of an electric tricycle as described in claim 1, characterized in that, The bottom of the bottom support frame (2) has a convex surface (29), and the base (3) is provided with a concave surface (30) that cooperates with the convex surface (29). When the convex surface (29) is fully attached to the concave surface (30), the clamping fixture returns to its initial state.

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