Motorcycle frame welding tool

Abstract

The utility model discloses a motorcycle frame welding tool, relates to the technical field of motorcycle frames, and aims to solve the problems that the inclination angle and the diameter of a motorcycle head tube of an existing motorcycle frame are changed due to different motorcycle types, and the motorcycle head tube is difficult to flexibly clamp and fix by the existing motorcycle frame welding tool. A motorcycle head pipe fixing frame is installed on one side of the upper portion of the base, a motorcycle head pipe positioning frame is installed at the upper end of the motorcycle head pipe fixing frame, a rotating frame is arranged at the lower end of the motorcycle head pipe fixing frame, a movable limiting mechanism is installed on the upper portion of the interior of the motorcycle head pipe positioning frame, and a fixed limiting mechanism is installed on the lower portion of the interior of the motorcycle head pipe positioning frame. A bicycle head pipe is arranged at one end of the bicycle frame and located between the fixed limiting mechanism and the movable limiting mechanism, and the other end of the bicycle frame is located in the bicycle frame middle clamping mechanism.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle frame technology, specifically a motorcycle frame welding fixture. Background Technology

[0002] Motorcycle frame welding fixtures are crucial equipment for ensuring the quality and precision of frame welding. These fixtures are flexible clamps for fixing, clamping, and positioning welding components. For motorcycle frames, welding fixtures ensure that the components being assembled meet the designed relative positional and geometric tolerances before and after welding, guaranteeing the final assembly accuracy. The fixture design emphasizes ease of operation; the clamping parts can rotate 360 ​​degrees for easy material loading and unloading. The angle gauge has a clear scale for precise adjustment of the welding position, ensuring consistent welding quality for the welder.

[0003] Chinese Patent Publication No. CN222095169U discloses a motorcycle frame welding fixture, belonging to the field of motorcycle frame technology. It includes a support base with two support plates on top. A drive motor is located outside the support base, and a positive and negative lead screw is fixedly connected to the output end of the drive motor. Two transmission lead screw seats are threadedly connected to the outer surface of the positive and negative lead screws. The upper surfaces of the two transmission lead screw seats are fixedly connected to the bottom surfaces of the two support plates, respectively. Support blocks are fixedly connected to the upper surfaces of both support plates. Fixing seats are fixedly installed on the opposite sides of the two support blocks. Electric push rods are fixedly installed on the opposite sides of the two sets of fixing seats. The adjacent ends of the two sets of electric push rods pass through the support blocks and extend above the support plates. This motorcycle frame welding fixture has an automatic positioning and clamping structure for the motorcycle frame, ensuring stability during welding and improving welding speed.

[0004] The existing technical solutions mentioned above have the following drawbacks: the tilt angle and diameter of the head tube of the existing motorcycle frame vary depending on the model, and the existing motorcycle frame welding fixtures are difficult to meet the requirements for flexible clamping and fixing of the head tube. Therefore, we propose a motorcycle frame welding fixture to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a motorcycle frame welding fixture to solve the problem mentioned in the background art that the tilt angle and diameter of the head tube of the existing motorcycle frame vary due to different models, and the existing motorcycle frame welding fixture is difficult to meet the problem of flexible clamping and fixing of the head tube.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a motorcycle frame welding fixture, comprising a base and a frame, a head tube fixing bracket installed on one side above the base, a head tube positioning frame installed at the upper end of the head tube fixing bracket, a rotating bracket provided at the lower end of the head tube fixing bracket, a movable limiting mechanism installed at the upper part of the head tube positioning frame, a fixed limiting mechanism installed at the lower part of the head tube positioning frame, a head tube provided at one end of the frame, the head tube being located between the fixed limiting mechanism and the movable limiting mechanism, and the other end of the frame being located inside the frame's intermediate clamping mechanism.

[0007] Preferably, a rear frame mounting bracket is installed on the other side above the base, a frame intermediate fixing mechanism is installed on one side above the rear frame mounting bracket, a rear clamping mechanism is installed on the other side above the rear frame mounting bracket, a frame intermediate fixing mechanism mounting bracket is provided at the lower end of the frame intermediate fixing mechanism, a fifth telescopic cylinder is installed at the upper end of the frame intermediate fixing mechanism, a frame intermediate clamping mechanism is provided at the middle position of the frame intermediate fixing mechanism, and the upper frame intermediate clamping mechanism is fixedly connected to the lower end of the fifth telescopic cylinder.

[0008] Preferably, a head tube fixing bracket fixing seat is fixedly installed below the rotating frame, an electric telescopic cylinder mounting seat is fixedly installed on one side of the upper end of the base, a third electric telescopic cylinder connecting plate is fixedly installed on one side above the head tube fixing bracket fixing seat, a third electric telescopic cylinder is fixedly installed between the third electric telescopic cylinder connecting plate and the electric telescopic cylinder mounting seat, and limit edges are symmetrically provided on the front and rear sides below the head tube fixing bracket fixing seat.

[0009] Preferably, a first clamping electric telescopic cylinder frame is fixedly installed above the head tube positioning frame, a first clamping electric telescopic cylinder is fixedly installed above the first clamping electric telescopic cylinder frame, and a first connecting rod is fixedly installed below the first clamping electric telescopic cylinder. The lower end of the first connecting rod passes through and extends into the interior of the head tube positioning frame and is fixedly connected to the movable limiting mechanism.

[0010] Preferably, the upper end of the rotating frame is provided with an upper connecting frame, which is fixedly connected to the head tube positioning frame. The lower end of the rotating frame is provided with a lower connecting frame. A rotating shaft is fixedly installed inside the lower end of the upper connecting frame, and a driven gear is fixedly fitted on the outside of the rotating shaft. A rotating motor is installed above the inside of the lower connecting frame, and a driving gear is driven and connected to the output end of the rotating motor. The driving gear and the driven gear are meshed and connected. A fourth electric telescopic cylinder is symmetrically installed inside the lower end of the lower connecting frame. A gear locking block mounting bracket is fixedly installed above the fourth electric telescopic cylinder, and a gear locking block is fixedly installed above the gear locking block mounting bracket. The gear locking block is meshed and connected to the driven gear.

[0011] Preferably, an installation tube is fixedly installed at the outer end of the fixed limiting mechanism and the movable limiting mechanism, a sixth electric telescopic cylinder is fixedly installed inside the installation tube, a push block is fixedly installed below the sixth electric telescopic cylinder, a limiting mechanism positioning frame is fixedly installed inside the lower part of the installation tube, the push block is located inside the limiting mechanism positioning frame, and six sets of clamping plates are arranged in a ring below the limiting mechanism positioning frame.

[0012] Preferably, six linkage limit blocks are fixedly installed in a ring at the outer end of the push block, a clamping plate groove is opened inside the upper end of the clamping plate, a clamping plate slider is fixedly installed at the upper end of the positioning frame of the limiting mechanism, the clamping plate slider is slidably connected to the clamping plate groove, two second linkage rods are provided between the push block and the clamping plate, the two ends of the second linkage rods are rotatably connected to the push block and the clamping plate respectively, and the clamping plate is in contact with the inner walls of the upper and lower ends of the head tube.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: When using this utility model, the head tube is fixed by the head tube fixing bracket, the middle position of the frame is fixed by the frame intermediate fixing mechanism, and the rear end of the frame is dragged and fixed by the rear clamping mechanism. When the frame intermediate fixing mechanism is fixed, the frame is placed inside the frame intermediate clamping mechanism. The fifth telescopic cylinder is extended so that the frame intermediate clamping mechanism clamps the middle position of the frame, placing the head tube between the fixed limiting mechanism and the movable limiting mechanism. The rotating motor is started, and the output end of the rotating motor drives the driving gear to rotate. The driving gear drives the driven gear to rotate through meshing connection. The driven gear drives the upper connecting frame with the rotating shaft to rotate, so that the connecting line between the fixed limiting mechanism and the movable limiting mechanism is parallel to the central axis of the head tube. At this time, the fourth electric telescopic cylinder is extended. The fourth electric telescopic cylinder tooth drives the gear locking block mounting bracket to move upward, thereby driving the gear locking block to mesh with the driven gear and locking the rotation angle of the driven gear. Then the third electric telescopic cylinder is extended. The telescopic cylinder has one end fixedly connected to the electric telescopic cylinder mounting base, and the other end pushes the head tube fixing bracket fixing seat, which is equipped with the third electric telescopic cylinder connecting plate, to slide horizontally on the base, so that the connecting line between the fixed limiting mechanism and the movable limiting mechanism coincides with the central axis of the head tube. At this time, the first clamping electric telescopic cylinder extends, and the first clamping electric telescopic cylinder drives the first connecting rod to move down. The first connecting rod pushes the movable limiting mechanism into the interior of the head tube. The two sixth electric telescopic cylinders extend, and the sixth electric telescopic cylinders drive the pushing block to move towards the center position of the head tube. The pushing block drives the second connecting rod to rotate around the pivot between the pushing block and the second connecting rod, thereby pushing the clamping plate towards the inner wall of the head tube, thereby locking the inner walls of the upper and lower ends of the head tube. The sliding clamping plate setting can realize the clamping of head tubes of multiple diameters, which solves the problem that the tilt angle and diameter of the head tube of the existing motorcycle frame vary due to different models, and the existing motorcycle frame welding fixtures cannot meet the problem of flexible clamping and fixing of the head tube. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the rotating frame in this utility model;

[0016] Figure 3 This is a diagram showing the connection relationship between the fixed limiting mechanism, the movable limiting mechanism, and the head tube in this utility model;

[0017] Figure 4 This is a schematic diagram of the fixed limiting mechanism in this utility model;

[0018] Figure 5 This is a perspective view of the head tube fixing bracket fixing seat in this utility model.

[0019] In the diagram: 1. Base; 2. Head tube mounting bracket; 3. Rear frame mounting bracket; 4. Head tube mounting bracket seat; 5. Rotating frame; 6. Head tube positioning frame; 7. First clamping electric telescopic cylinder frame; 8. First clamping electric telescopic cylinder; 9. First connecting rod; 10. Fixed limit mechanism; 11. Movable limit mechanism; 12. Frame intermediate fixing mechanism; 13. Frame intermediate clamping mechanism; 14. Fifth telescopic cylinder; 15. Frame intermediate fixing mechanism mounting bracket; 16. Rear clamping mechanism; 17. Frame; 18. Head tube; 19. Electric telescopic cylinder mounting seat; 2 0. Third electric telescopic cylinder; 21. Driven gear; 22. Rotating shaft; 23. Upper connecting frame; 24. Lower connecting frame; 25. Fourth electric telescopic cylinder; 26. Gear locking block mounting frame; 27. Gear locking block; 28. Rotating motor; 29. ​​Driving gear; 30. Mounting tube; 31. Sixth electric telescopic cylinder; 32. Limiting mechanism positioning frame; 33. Push block; 34. Clamping plate; 35. Second connecting rod; 36. Clamping plate slide groove; 37. Clamping plate slider; 38. Connecting rod limiting block; 39. Third electric telescopic cylinder connecting plate; 40. Limiting edge. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Please see Figure 1-5 This utility model provides an embodiment of a motorcycle frame welding fixture, including a base 1 and a frame 17. A head tube fixing bracket 2 is installed on one side above the base 1. A head tube positioning frame 6 is installed on the upper end of the head tube fixing bracket 2. A rotating frame 5 is provided at the lower end of the head tube fixing bracket 2. A movable limiting mechanism 11 is installed at the upper part of the inside of the head tube positioning frame 6. A fixed limiting mechanism 10 is installed at the lower part of the inside of the head tube positioning frame 6. A head tube 18 is provided at one end of the frame 17. The head tube 18 is located between the fixed limiting mechanism 10 and the movable limiting mechanism 11. The other end of the frame 17 is located inside the frame middle clamping mechanism 13.

[0022] In use, the head tube 18 is fixed by the head tube fixing bracket 2, the middle position of the frame 17 is fixed by the frame intermediate fixing mechanism 12, and the rear end of the frame 17 is dragged and fixed by the rear clamping mechanism 16. When the frame intermediate fixing mechanism 12 is fixed, the frame 17 is placed inside the frame intermediate clamping mechanism 13, the fifth telescopic cylinder 14 is extended, so that the frame intermediate clamping mechanism 13 clamps the middle position of the frame 17, and the head tube 18 is placed between the fixed limiting mechanism 10 and the movable limiting mechanism 11. The rotating motor 28 is started, and its output drives the driving gear 29 to rotate. The driving gear 29, through meshing, drives the driven gear 21 to rotate. The driven gear 21 drives the upper connecting frame 23, which is equipped with a rotating shaft 22, to rotate, so that the connecting line between the fixed limiting mechanism 10 and the movable limiting mechanism 11 is parallel to the central axis of the head tube 18. At this time, the fourth electric telescopic cylinder 25 is extended. The teeth of the fourth electric telescopic cylinder 25 drive the gear locking block mounting bracket 26 to move upward, thereby causing the gear locking block 27 to mesh with the driven gear 21. The connection is made to lock the rotation angle of the driven gear 21, and then the third electric telescopic cylinder 20 is extended. One end of the third electric telescopic cylinder 20 is fixedly connected to the electric telescopic cylinder mounting base 19, and the other end of the third electric telescopic cylinder 20 pushes the head tube fixing bracket fixing seat 4, which is equipped with the third electric telescopic cylinder connecting plate 39, to slide horizontally on the base 1, so that the connecting line between the fixed limiting mechanism 10 and the movable limiting mechanism 11 coincides with the central axis of the head tube 18. At this time, the first clamping electric telescopic cylinder 8 is extended, and the first clamping electric telescopic cylinder 8 drives... The first linkage 9 moves downward, pushing the movable limiting mechanism 11 into the interior of the head tube 18, extending the two sixth electric telescopic cylinders 31. The sixth electric telescopic cylinders 31 drive the push block 33 to move towards the center position of the head tube 18. The push block 33 drives the second linkage 35 to rotate on the pivot between the push block 33 and the second linkage 35, thereby pushing the clamping plate 34 towards the inner wall of the head tube 18, thereby locking the inner walls of the upper and lower ends of the head tube 18. The sliding clamping plate 34 can be used to clamp head tubes 18 of multiple diameters.

[0023] Please see Figure 1 A rear frame fixing bracket 3 is installed on the other side above the base 1. A frame intermediate fixing mechanism 12 is installed on one side above the rear frame fixing bracket 3. A rear clamping mechanism 16 is installed on the other side above the rear frame fixing bracket 3. A frame intermediate fixing mechanism mounting bracket 15 is provided at the lower end of the frame intermediate fixing mechanism 12. A fifth telescopic cylinder 14 is installed at the upper end of the frame intermediate fixing mechanism 12. A frame intermediate clamping mechanism 13 is provided at the middle position of the frame intermediate fixing mechanism 12. The upper frame intermediate clamping mechanism 13 is fixedly connected to the lower end of the fifth telescopic cylinder 14.

[0024] Please see Figure 1 and Figure 5A head tube fixing bracket 4 is fixedly installed below the rotating frame 5. An electric telescopic cylinder mounting base 19 is fixedly installed on one side of the upper end of the base 1. A third electric telescopic cylinder connecting plate 39 is fixedly installed on one side above the head tube fixing bracket 4. A third electric telescopic cylinder 20 is fixedly installed between the third electric telescopic cylinder connecting plate 39 and the electric telescopic cylinder mounting base 19. Limiting edges 40 are symmetrically arranged on the front and rear sides below the head tube fixing bracket 4. A first clamping electric telescopic cylinder frame 7 is fixedly installed above the head tube positioning frame 6. A first clamping electric telescopic cylinder 8 is fixedly installed above the first clamping electric telescopic cylinder frame 7. A first connecting rod 9 is fixedly installed below the first clamping electric telescopic cylinder 8. The lower end of the first connecting rod 9 passes through and extends into the interior of the head tube positioning frame 6 and is fixedly connected to the movable limiting mechanism 11.

[0025] Please see Figure 2 The upper end of the rotating frame 5 is provided with an upper connecting frame 23, which is fixedly connected to the head tube positioning frame 6. The lower end of the rotating frame 5 is provided with a lower connecting frame 24. The lower end of the upper connecting frame 23 is fixedly installed with a rotating shaft 22, and the external side of the rotating shaft 22 is fixedly fitted with a driven gear 21. The upper part of the lower connecting frame 24 is installed with a rotating motor 28, and the output end of the rotating motor 28 is driven by a driving gear 29. The driving gear 29 and the driven gear 21 are meshed and connected. The lower end of the lower connecting frame 24 is symmetrically installed with a fourth electric telescopic cylinder 25. The gear locking block mounting bracket 26 is fixedly installed above the fourth electric telescopic cylinder 25, and the gear locking block 27 is fixedly installed above the gear locking block mounting bracket 26. The gear locking block 27 and the driven gear 21 are meshed and connected.

[0026] Please see Figure 3-4 An installation tube 30 is fixedly installed on the outer end of the fixed limiting mechanism 10 and the movable limiting mechanism 11. A sixth electric telescopic cylinder 31 is fixedly installed inside the installation tube 30. A push block 33 is fixedly installed below the sixth electric telescopic cylinder 31. A limiting mechanism positioning frame 32 is fixedly installed inside the lower part of the installation tube 30. The push block 33 is located inside the limiting mechanism positioning frame 32. Six sets of clamping plates 34 are arranged in a ring below the limiting mechanism positioning frame 32. Six linkage limit blocks 38 are fixedly installed in a ring at the outer end of the push block 33. A clamping plate groove 36 is opened inside the upper end of the clamping plate 34. A clamping plate slider 37 is fixedly installed at the upper end of the positioning frame 32 of the limiting mechanism. The clamping plate slider 37 is slidably connected to the clamping plate groove 36. Two second linkage rods 35 are provided between the push block 33 and the clamping plate 34. The two ends of the second linkage rods 35 are rotatably connected to the push block 33 and the clamping plate 34 respectively. The clamping plate 34 is in contact with the inner walls of the upper and lower ends of the head tube 18.

[0027] Working principle: In use, the head tube 18 is fixed by the head tube fixing bracket 2, the middle position of the frame 17 is fixed by the frame intermediate fixing mechanism 12, and the rear end of the frame 17 is dragged and fixed by the rear clamping mechanism 16. When the frame intermediate fixing mechanism 12 is fixed, the frame 17 is placed inside the frame intermediate clamping mechanism 13. The fifth telescopic cylinder 14 is extended, so that the frame intermediate clamping mechanism 13 clamps the middle position of the frame 17, placing the head tube 18 between the fixed limiting mechanism 10 and the movable limiting mechanism 1. Between points 1 and 2, the rotating motor 28 is started. The output end of the rotating motor 28 drives the driving gear 29 to rotate. The driving gear 29 drives the driven gear 21 to rotate through meshing connection. The driven gear 21 drives the upper connecting frame 23, which is equipped with a rotating shaft 22, to rotate, so that the connecting line between the fixed limiting mechanism 10 and the movable limiting mechanism 11 is parallel to the central axis of the head tube 18. At this time, the fourth electric telescopic cylinder 25 is extended. The teeth of the fourth electric telescopic cylinder 25 drive the gear locking block mounting bracket 26 to move upward, thereby driving the gear locking block 27 and the driven gear 21 to move upward. The meshing connection locks the rotation angle of the driven gear 21, and then the third electric telescopic cylinder 20 extends. One end of the third electric telescopic cylinder 20 is fixedly connected to the electric telescopic cylinder mounting base 19, and the other end of the third electric telescopic cylinder 20 pushes the head tube fixing bracket fixing seat 4, which is equipped with the third electric telescopic cylinder connecting plate 39, to slide horizontally on the base 1, so that the connecting line between the fixed limiting mechanism 10 and the movable limiting mechanism 11 coincides with the central axis of the head tube 18. At this time, the first clamping electric telescopic cylinder 8 extends, and the first clamping electric telescopic cylinder 8 carries... The first linkage rod 9 moves downward, pushing the movable limiting mechanism 11 into the interior of the head tube 18, extending the two sixth electric telescopic cylinders 31. The sixth electric telescopic cylinders 31 drive the push block 33 to move towards the center position of the head tube 18. The push block 33 drives the second linkage rod 35 to rotate on the pivot between the push block 33 and the second linkage rod 35, thereby pushing the clamping plate 34 towards the inner wall of the head tube 18, thereby locking the inner walls of the upper and lower ends of the head tube 18. The sliding clamping plate 34 can be used to clamp head tubes 18 of multiple diameters.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A motorcycle frame welding fixture comprising a base (1) and a frame (17), characterized in that: The side above the base (1) is provided with a head pipe fixing frame (2), the upper end of the head pipe fixing frame (2) is provided with a head pipe positioning frame (6), the lower end of the head pipe fixing frame (2) is provided with a rotating frame (5), the upper part inside the head pipe positioning frame (6) is provided with a movable limiting mechanism (11), the lower part inside the head pipe positioning frame (6) is provided with a fixed limiting mechanism (10), one end of the frame (17) is provided with a head pipe (18), the head pipe (18) is located between the fixed limiting mechanism (10) and the movable limiting mechanism (11), the other end of the frame (17) is located inside the frame middle clamping mechanism (13).

2. A motorcycle frame welding fixture according to claim 1, characterized in that: The other side above the base (1) is provided with a rear frame fixing frame (3), the upper side of the rear frame fixing frame (3) is provided with a frame middle fixing mechanism (12), the other side above the rear frame fixing frame (3) is provided with a rear clamping mechanism (16), the lower end of the frame middle fixing mechanism (12) is provided with a frame middle fixing mechanism mounting frame (15), the upper end of the frame middle fixing mechanism (12) is provided with a fifth telescopic cylinder (14), the middle position of the frame middle fixing mechanism (12) is provided with a frame middle clamping mechanism (13), the upper frame middle clamping mechanism (13) is fixedly connected with the lower end of the fifth telescopic cylinder (14).

3. A motorcycle frame welding fixture as claimed in claim 1, wherein: The lower part of the rotating frame (5) is fixedly provided with a head pipe fixing frame fixing seat (4), one side of the upper end of the base (1) is fixedly provided with an electric telescopic cylinder mounting seat (19), one side above the head pipe fixing frame fixing seat (4) is fixedly provided with a third electric telescopic cylinder connecting plate (39), the third electric telescopic cylinder connecting plate (39) and the electric telescopic cylinder mounting seat (19) are fixedly provided with a third electric telescopic cylinder (20), the front and rear sides below the head pipe fixing frame fixing seat (4) are symmetrically provided with limiting edges (40).

4. A motorcycle frame welding fixture as claimed in claim 1, wherein: The upper part of the head pipe positioning frame (6) is fixedly provided with a first clamping electric telescopic cylinder frame (7), the upper part of the first clamping electric telescopic cylinder frame (7) is fixedly provided with a first clamping electric telescopic cylinder (8), the lower part of the first clamping electric telescopic cylinder (8) is fixedly provided with a first connecting rod (9), the lower end of the first connecting rod (9) penetrates and extends to the inside of the head pipe positioning frame (6) and is fixedly connected with the movable limiting mechanism (11).

5. A motorcycle frame welding fixture as claimed in claim 1, wherein: The upper end of the rotating frame (5) is provided with an upper connecting frame (23), the upper connecting frame (23) is fixedly connected with the head pipe positioning frame (6), the lower end of the rotating frame (5) is provided with a lower connecting frame (24), the inside of the lower end of the upper connecting frame (23) is fixedly installed with a rotating shaft (22), the outside of the rotating shaft (22) is fixedly installed with a driven gear (21), the upper inside of the lower connecting frame (24) is installed with a rotating motor (28), the output end of the rotating motor (28) is drivingly installed with a driving gear (29), the driving gear (29) is meshingly connected with the driven gear (21), the inside of the lower end of the lower connecting frame (24) is symmetrically installed with a fourth electric telescopic cylinder (25), the upper side of the fourth electric telescopic cylinder (25) is fixedly installed with a gear locking block mounting frame (26), the upper side of the gear locking block mounting frame (26) is fixedly installed with a gear locking block (27), the gear locking block (27) is meshingly connected with the driven gear (21).

6. A motorcycle frame welding fixture as claimed in claim 1, wherein: The outer end of the fixed limiting mechanism (10) and the movable limiting mechanism (11) is fixedly installed with a mounting pipe (30), the inside of the mounting pipe (30) is fixedly installed with a sixth electric telescopic cylinder (31), the lower side of the sixth electric telescopic cylinder (31) is fixedly installed with a pushing block (33), the inside of the lower side of the mounting pipe (30) is fixedly installed with a limiting mechanism positioning frame (32), the pushing block (33) is located in the inside of the limiting mechanism positioning frame (32), the lower side of the limiting mechanism positioning frame (32) is annularly provided with six clamping plates (34).

7. A motorcycle frame welding fixture as claimed in claim 6, wherein: The outer end of the pushing block (33) is annularly fixedly installed with six linkage rod limiting blocks (38), the inside of the upper end of the clamping plate (34) is provided with a clamping plate sliding groove (36), the upper end of the limiting mechanism positioning frame (32) is fixedly installed with a clamping plate sliding block (37), the clamping plate sliding block (37) is slidingly connected with the clamping plate sliding groove (36), two second linkage rods (35) are arranged between the pushing block (33) and the clamping plate (34), the two ends of the second linkage rod (35) are respectively rotationally connected with the pushing block (33) and the clamping plate (34), the clamping plate (34) is attached to the inner walls of the upper and lower ends of the head pipe (18).

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