A bicycle fork automatic welding device

Abstract

The application discloses a bicycle tripod automatic welding device and belongs to the technical field of bicycle production and manufacturing. The device comprises a rack, a first positioning mechanism and a second positioning mechanism which are arranged side by side and reversibly on the rack, a moving mechanism arranged on the rack, a multi-axis welding robot installed on the moving mechanism, a rotary driving mechanism and a control unit. A plurality of pipe positioning components are arranged on the first positioning mechanism. A supporting component is arranged on the second positioning mechanism. After the first side welding is completed by the first positioning mechanism, the rotary driving mechanism drives the two positioning mechanisms to synchronously reverse to a vertical state, the control unit controls the first positioning mechanism to release clamping and controls the second positioning mechanism to clamp, so that the automatic handover, transfer and surface turning of the tripod are realized, and then the multi-axis welding robot completes welding of the other side. The application realizes continuous welding of two sides of the tripod without disassembly, and guarantees welding precision and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of bicycle manufacturing technology, and specifically discloses an automatic welding equipment for bicycle frames. Background Technology

[0002] Bicycle frames (commonly known as triangle frames) are mainly welded from components such as the head tube, top tube, down tube, seat tube, and bottom bracket. Before welding, each component needs to be assembled and aligned using positioning fixtures, and then the welding equipment completes the weld connection. Currently, the automatic welding of bicycle triangle frames requires the use of clamping fixtures. The clamping fixtures typically have multiple clamping cylinders on a base, which clamp and fix each component in place. Then, a welding robot is used to weld the joints.

[0003] For example, invention application with application number 202511631618.2 discloses a welding equipment and welding method for bicycle production. The welding equipment includes an operating table, on which are provided a positioning pin for positioning the bottom bracket, a positioning component for positioning the head tube, and a locking mechanism for fixing the position of the riser, down tube, and top tube. The clamping fixtures used in the above-disclosed welding equipment can position the various tubes of the tripod to ensure welding accuracy.

[0004] However, the positioning fixture in this welding equipment can only achieve assembly, positioning, and welding of frame tubes with one side facing upwards (i.e., the frame is laid flat). When welding is required on the other side after welding one side of the frame, the entire frame still needs to be disassembled from the fixture, rotated 180°, and re-clamped and positioned. It cannot achieve automatic flipping of the frame during the welding process. Furthermore, the secondary clamping not only increases manual operation and reduces production efficiency, but also makes it difficult to ensure complete consistency with the positioning reference of the first clamping during repositioning. The resulting positioning error directly affects the symmetry of the welds on both sides of the frame and the overall dimensional accuracy. Based on this, this application proposes an automatic welding device for bicycle triangle frames that can effectively solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides an automatic welding device for bicycle frames, aiming to solve the technical problems of existing welding equipment that cannot automatically flip the frames and requires secondary clamping, resulting in low efficiency and reduced positioning accuracy. This invention uses two flip-up positioning mechanisms to complete the transfer of clamping power in a vertical state, enabling continuous double-sided welding of the frame without disassembly, ensuring both welding accuracy and production efficiency.

[0006] This invention is achieved through the following technical solution: An automated welding device for bicycle frames includes a frame and a multi-axis welding robot, and also includes: A first positioning mechanism and a second positioning mechanism are arranged side by side and can be flipped on the platform; the first positioning mechanism is provided with a pipe positioning assembly for assembling and positioning each pipe in the tripod; the second positioning mechanism is provided with a frame clamping and fixing assembly for clamping and fixing the entire tripod after welding on the first surface. A moving mechanism is mounted on the platform and located on one side of the first positioning mechanism and the second positioning mechanism; the multi-axis welding robot moves and switches between two workstations of the first positioning mechanism and the second positioning mechanism under the action of the moving mechanism. A rotary drive mechanism is mounted on the platform and acts simultaneously on the first positioning mechanism and the second positioning mechanism, so that the first positioning mechanism and the second positioning mechanism rotate in opposite directions synchronously. When the first positioning mechanism and the second positioning mechanism are flipped to a preset angle, the control unit controls the pipe positioning assembly on the first positioning mechanism to release the clamp on the tripod, and controls the frame clamping and fixing assembly on the second positioning mechanism to clamp and fix the tripod, so as to realize the transfer of the tripod between the first positioning mechanism and the second positioning mechanism.

[0007] As a further provision of the above scheme, the rotary drive mechanism includes a drive cylinder, a U-shaped bar, and gears. The drive cylinder is fixed on the frame and located between the first positioning mechanism and the second positioning mechanism. The U-shaped bar is fixedly disposed at the telescopic end of the drive cylinder, and both ends of the U-shaped bar are provided with toothed surfaces. The first positioning mechanism and the second positioning mechanism are each fixed with a shaft on their respective sides, and each shaft is fixedly disposed with a gear at its end. The two gears respectively mesh with the toothed surfaces at both ends of the U-shaped bar.

[0008] As a further provision of the above scheme, the first positioning mechanism includes a first carrier plate, and the pipe positioning assembly includes a head tube bidirectional clamping assembly, a five-way pipe tensioning and fixing assembly, a seat tube pressing assembly, and an upper and lower tube synchronous clamping mechanism disposed on the first carrier plate.

[0009] As a further provision of the above scheme, the second positioning mechanism includes a second carrier plate, on which a five-way tube tensioning and fixing component and at least one frame clamping and fixing component are provided.

[0010] As a further provision of the above solution, the bidirectional clamping assembly for the head tube includes a transmission groove fixed to the upper surface of the first carrier plate, a bidirectional screw rotatably installed inside the transmission groove, and a clamping motor for driving the bidirectional screw to rotate. Each end of the transmission groove is provided with a sliding block that is threadedly engaged with the corresponding section of the bidirectional screw. Each of the two sliding blocks is provided with a clamping pressure block on the opposite side of its outer end extending out of the transmission groove.

[0011] As a further provision of the above solution, the synchronous clamping mechanism for the upper and lower tubes includes a trapezoidal block, a first limiting stop bar, a second limiting stop bar, a first clamping bar, a second clamping bar, and a wedge-shaped pushing block. The trapezoidal block is fixed on the upper surface of the first carrier plate at the position corresponding to the internal gap of the tripod. The hypotenuse of the trapezoidal block is parallel to the lower tube of the tripod, and the vertical side is parallel to the upper tube of the tripod. The first limiting stop bar is located on the opposite side of the hypotenuse, and the second limiting stop bar is located on the opposite side of the vertical side. Both ends of the trapezoidal block are provided with storage slots. The first clamping bar and the second clamping bar are respectively movably disposed in the corresponding storage slots. The first clamping bar and the second clamping bar are each provided with a pressure rod passing through the storage slot, and a spring for resetting is sleeved on the pressure rod. The end of the pressure rod that extends into the inner cavity of the trapezoidal block is rotatably provided with an abutment wheel. The wedge-shaped pushing block is disposed in the inner cavity of the trapezoidal block, and a pushing cylinder for pushing the wedge-shaped pushing block is provided on the trapezoidal block.

[0012] As a further provision of the above solution, the seat tube clamping assembly includes a clamping cylinder fixed on the first carrier plate, the clamping cylinder being arranged axially along the seat tube in the tripod and connected to a clamping end block.

[0013] As a further feature of the above solution, the five-way tube tensioning and fixing assembly includes a mechanical expansion shaft vertically disposed on the first carrier plate or the second carrier plate, and one end of the mechanical expansion shaft is connected to a driver.

[0014] As a further provision of the above solution, the moving mechanism includes two parallel slide rails and a screw rod disposed between the two slide rails, and one end of the screw rod is connected to a screw motor; the multi-axis welding robot includes a robot body, the bottom of the robot body is provided with a base that slides and engages with the two slide rails, and the base is provided with a screw hole block that interacts with the screw rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention sets up a first and second positioning mechanism that are side-by-side and can be flipped, and uses a rotary drive mechanism to drive them to flip synchronously to a vertical state. In the vertical state, the handover of the tripod clamping power is completed, so that the tripod can automatically flip over without disassembly or re-clamping. With the help of a multi-axis welding robot that moves back and forth between the two workstations under the drive of the moving mechanism, continuous welding operations on the first and second sides of the tripod are realized. This avoids the inefficiency and positioning error problems caused by manual disassembly, flipping and re-clamping in traditional solutions, and significantly improves welding production efficiency and product size consistency.

[0016] The first positioning mechanism of this invention integrates a head tube bidirectional clamping assembly, a bottom bracket tube tensioning and fixing assembly, a seat tube pressing assembly, and an upper and lower tube synchronous clamping mechanism. It can perform all-round precise assembly and positioning of each pipe component of the tripod, ensuring the relative positional accuracy between each pipe component before welding the first side. In particular, the upper and lower tube synchronous clamping mechanism simultaneously pushes two clamping bars outward through a wedge-shaped pushing block, and works with the limiting stop bar to achieve synchronous clamping of the upper and lower pipes. This avoids displacement of the pipe components during the sequential clamping process, ensures the parallelism of the upper and lower pipes and the docking accuracy with the head tube and bottom bracket, and provides a reliable guarantee for the subsequent welding quality.

[0017] The second positioning mechanism in this invention only requires a five-way pipe tensioning and fixing component and a frame clamping and fixing component to provide stable support for the welded triangular frame, which simplifies the equipment structure and reduces manufacturing costs. At the same time, the rotary drive mechanism adopts a linkage structure in which a drive cylinder drives a U-shaped bar and synchronously drives the two positioning mechanisms to rotate through tooth surface meshing. The entire transmission structure is reliable and has high synchronization accuracy. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a three-dimensional structural diagram of the first state of the present invention; Figure 2 This is a three-dimensional structural diagram of the second state of the present invention; Figure 3 This is a three-dimensional structural diagram of the moving mechanism and multi-axis welding robot in this invention; Figure 4 This is a three-dimensional structural diagram of the first positioning mechanism and the tripod when they are in conjunction in this invention; Figure 5 This is a three-dimensional structural diagram of the first positioning mechanism after it has released its clamping and positioning function in this invention. Figure 6 This is a schematic diagram of the internal three-dimensional structure of the upper and lower tube synchronous clamping mechanism in this invention; Figure 7 This is a three-dimensional structural diagram of the first positioning mechanism in this invention; Figure 8 For the present invention Figure 1 A magnified structural diagram of point A in the middle. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-8 This application will be described in detail with reference to the embodiments. Example 1

[0022] Example 1 discloses an automatic welding device for bicycle frames, such as... Figure 1 and Figure 2 As shown, the device includes a movable platform 10, with a control box 20 for controlling the entire device located on the side of the platform 10. A first positioning mechanism 30 and a second positioning mechanism 40 are rotatably mounted on the front end of the upper surface of the platform 10, arranged in a mirror-symmetrical manner. When switched to a vertical position, they can transfer the tripod 100. A moving mechanism 50 is located at the rear end of the upper surface of the platform 10, and a multi-axis welding robot 60 is mounted on the moving mechanism 50. The multi-axis welding robot 60 can switch positions under the action of the moving mechanism 50 to perform welding processing on the tripod 100 fixed on the first positioning mechanism 30 and the second positioning mechanism 40.

[0023] like Figure 3 As shown, the moving mechanism 50 includes two side end plates 51, with two parallel slide rails 52 arranged between them. A screw 53 is rotatably mounted between the two slide rails 52, and one end of the screw 53 is connected to a screw motor 54 fixed to one of the side end plates 51. The multi-axis welding robot 60 includes a robot body 61. The bottom of the robot body 61 is provided with a base 62 that slides with the two slide rails 52, and a screw hole block 63 that interacts with the screw 53 is provided on the base 62. A welding torch head 64 is also provided at the output end of the robot body 61.

[0024] like Figures 4-6 As shown, the first positioning mechanism 30 includes a first carrier plate 31. A head tube bidirectional clamping assembly 32 is provided at one end of the upper surface of the first carrier plate 31 near the moving mechanism 50. A five-way tube tensioning and fixing assembly 33 and a seat tube pressing assembly 34 are respectively provided at both ends of the upper surface of the first carrier plate 31 away from the moving mechanism 50. Then, an upper and lower tube synchronous clamping mechanism 35 is also provided on the upper surface of the first carrier plate 31 at the position corresponding to the internal gap of the tripod 100.

[0025] The head tube bidirectional clamping assembly 32 includes a transmission groove 321 fixed to the upper surface of the first carrier plate 31. A bidirectional screw 322 is rotatably mounted inside the transmission groove 321, and one end of the bidirectional screw 322 is connected to a clamping motor 323. At both ends of the transmission groove 321, a sliding block 324 is provided, which engages with the corresponding external thread of the bidirectional screw 322. A clamping pressure block 325 is provided on the opposite side of the two sliding blocks 324 extending outward from the transmission groove 321. When the clamping motor 323 is started, the two sliding blocks 324 can approach each other under the meshing transmission of the bidirectional screw 322, thereby using their respective clamping pressure blocks 325 to clamp and fix the two ends of the head tube on the tripod 100 from both ends.

[0026] The five-way tube tensioning and fixing assembly 33 includes a mechanical expansion shaft vertically disposed on the upper surface of the first carrier plate 31, and a driver (not shown in the figure) for driving the mechanical expansion shaft is disposed on the lower surface of the first carrier plate 31. When the five-way tube on the tripod 100 is inserted into the mechanical expansion shaft, it can be tensioned and fixed by the mechanical expansion shaft.

[0027] The seat tube clamping assembly 34 includes a clamping cylinder 341 fixedly disposed on the upper surface of the first carrier plate 31. The extension and retraction direction of the clamping cylinder 341 is arranged along the axial direction of the seat tube on the tripod 100, and a clamping end block 342 is connected to its extension and retraction end.

[0028] The upper and lower tube synchronous clamping mechanism 35 includes a trapezoidal block 351 fixed to the upper surface of the first carrier plate 31 and located at the center of the tripod 100. The hypotenuse of the trapezoidal block 351 is parallel to the lower tube on the tripod 100, and the vertical side of the trapezoidal block 351 is parallel to the upper tube on the tripod 100. The upper and lower tube synchronous clamping mechanism 35 also includes a first limiting stop 352 and a second limiting stop 353. The first limiting stop 352 is located on the opposite side of the hypotenuse of the trapezoidal block 351, and the second limiting stop 353 is located on the opposite side of the vertical side of the trapezoidal block 351.

[0029] A receiving groove 354 is provided at both ends of the trapezoidal block 351 facing the first limiting stop 352 and the second limiting stop 353. A first clamping bar 355 aligned with the first limiting stop 352 and a second clamping bar 356 aligned with the second limiting stop 353 are respectively provided in the two receiving grooves 354. Arc-shaped mating grooves are provided on the outward-facing sides of the first clamping bar 355 and the second clamping bar 356. A pressure rod 357 passing through the inner wall of the receiving groove 354 is provided on the first clamping bar 355 and the second clamping bar 356. A spring 358 for resetting the first clamping bar 355 or the second clamping bar 356 is sleeved on the pressure rod 357. An abutment wheel 359 is rotatably provided at the end of the pressure rod 357 that extends into the inner cavity of the trapezoidal block 351. A push cylinder 360 is provided at the side end of the trapezoidal block 351. The end of the push cylinder 360 extending into the inner cavity of the trapezoidal block 351 is connected to a wedge-shaped pressing block 361 that simultaneously acts with two abutting wheels 359. When the push cylinder 360 extends, it pushes the wedge-shaped pressing block 361 to move. Then, the two inclined surfaces on the wedge-shaped pressing block 361 abut against the two abutting wheels 359 respectively. The first clamping bar 355 and the second clamping bar 356 both overcome the elastic force of the spring 358 and move outward synchronously. With the cooperation of the first limiting stop bar 352 and the second limiting stop bar 35, the upper tube and the lower tube in the tripod 100 can be clamped and fixed respectively.

[0030] like Figure 7 As shown, the second positioning mechanism 40 includes a second carrier plate 41. A five-way tube tensioning and fixing assembly 33 is provided on the second carrier plate 41 at the same position. At least one set of frame clamping and fixing assemblies 42 is also provided on the second carrier plate 41. Two frame clamping and fixing assemblies 42 are provided in this figure, corresponding to the positions of the upper and lower tubes in the tripod 100, respectively, and avoiding the position of the upper and lower tube synchronous clamping mechanism 35. Specifically, the frame clamping and fixing assembly 42 includes a clamping cylinder 421 located on the lower surface of the second carrier plate 41. A closed clamping block 422 is fixedly connected to each of the two jaws of the clamping cylinder 421. The two closed clamping blocks 422 can move closer or further apart under the driving action of the clamping cylinder 421, and clamping arc grooves adapted to the outer circular surface of the tubes on the tripod 100 are opened on their opposite sides.

[0031] like Figure 4 , Figure 7 and Figure 8As shown, the automatic welding equipment for bicycle frames also includes a rotary drive mechanism 70 for driving the first positioning mechanism 30 and the second positioning mechanism 40 to rotate synchronously and erect the frame, thus completing the frame transfer. The rotary drive mechanism 70 includes a drive cylinder 71 positioned between the first positioning mechanism 30 and the second positioning mechanism 40 and fixed to the platform 10. The telescopic end of the drive cylinder 71 is connected to a U-shaped bar 72 that can move up and down, and both ends of the U-shaped bar 72 are provided with toothed surfaces. A shaft 73 is fixed to the adjacent sides of the first carrier plate 31 and the second carrier plate 41, and each shaft 73 has a gear 74 fixedly provided at its end that meshes with the toothed surface of the corresponding side of the U-shaped bar 72. Furthermore, a bearing seat 75 is fixedly provided on the platform 10, and the shafts 73 on the first carrier plate 31 and the second carrier plate 41 are rotatably connected to the corresponding bearing seats 75. Finally, vibration damping pads 76 are provided at both ends of the upper surface of the platform 10. When the first carrier plate 31 and the second carrier plate 41 are in a horizontal state, they can be supported by the vibration damping pads 76.

[0032] The working process of the automatic bicycle frame welding equipment in this embodiment is as follows: In the first step, in the initial state, both the first positioning mechanism 30 and the second positioning mechanism 40 are in a horizontal position. The operator places the various components of the tripod 100 (including the head tube, seat tube, bottom bracket tube, upper tube, and lower tube) onto the first positioning mechanism 30 in sequence. Subsequently, the head tube bidirectional clamping assembly 32 clamps the head tube from both ends, the bottom bracket tube tensioning and fixing assembly 33 tensions and fixes the bottom bracket tube, the seat tube pressing assembly 34 presses it along the axial direction of the seat tube, and the upper and lower tube synchronous clamping mechanism 35 simultaneously pushes the first clamping bar 355 and the second clamping bar 356 through the wedge-shaped pushing block 361, cooperating with the first limiting stop bar 352 and the second limiting stop bar 353 to simultaneously clamp the upper and lower tubes. At this point, all the components of the tripod 100 are precisely assembled and positioned on the first positioning mechanism 30.

[0033] In the second step, the moving mechanism 50 drives the multi-axis welding robot 60 to move to the workstation corresponding to the first positioning mechanism 30, and the welding gun head 64 welds the weld seam on the upper surface of the tripod 100 to connect the pipes into an integral structure.

[0034] Thirdly, after the first side is welded, the rotary drive mechanism 70 is activated, and the drive cylinder 71 moves the U-shaped bar 72 upward. Through the meshing transmission of the gear 74 and the tooth surface, the first positioning mechanism 30 and the second positioning mechanism 40 are driven to rotate 90° around the shaft 73 to a vertical position. Subsequently, the control system issues a command, and the head tube bidirectional clamping assembly 32, the bottom tube tensioning and fixing assembly 33, the seat tube pressing assembly 34, and the upper and lower tube synchronous clamping mechanism 35 on the first positioning mechanism 30 are all released from clamping. At the same time, the bottom tube tensioning and fixing assembly 33 on the second positioning mechanism 40 is activated to tension and fix the bottom tube of the tripod 100. Then, the frame clamping and fixing assembly 42 is activated, and its clamping cylinder 421 drives the two closed clamping blocks 422 to move closer to each other, clamping the upper or lower tube of the tripod 100, so that the tripod 100 is stably supported by the second positioning mechanism 40. At this point, the tripod 100 has completed the transfer from the first positioning mechanism 30 to the second positioning mechanism 40, thus exposing its lower surface completely.

[0035] Fourth, the rotary drive mechanism 70 reverses its movement, driving the first positioning mechanism 30 and the second positioning mechanism 40 to simultaneously flip back to the horizontal state. Then, the moving mechanism 50 drives the multi-axis welding robot 60 to move to the workstation corresponding to the second positioning mechanism 40 to weld the weld seam on the lower surface of the tripod 100.

[0036] Fifth step: After the second side of the entire tripod 100 is welded, the five-way tube tensioning and fixing component 33 and the frame clamping and fixing component 42 on the second positioning mechanism 40 are released in sequence. The operator will then remove the finished tripod 100 with double-sided welding completed, thus completing one work cycle.

[0037] Throughout the process described above, the first positioning mechanism 30 and the second positioning mechanism 40 alternately clamp the carrying tripod 100, and the welding robot 60 moves back and forth between the two workstations under the drive of the moving mechanism 50, thus realizing the automated continuous operation of double-sided welding of the tripod.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic welding equipment for bicycle frames, comprising a frame and a multi-axis welding robot, characterized in that, Also includes: A first positioning mechanism and a second positioning mechanism are arranged side by side and can be flipped on the platform; the first positioning mechanism is provided with a pipe positioning assembly for assembling and positioning each pipe in the tripod; the second positioning mechanism is provided with a frame clamping and fixing assembly for clamping and fixing the entire tripod after welding on the first surface. A moving mechanism is mounted on the platform and located on one side of the first positioning mechanism and the second positioning mechanism; the multi-axis welding robot moves and switches between two workstations of the first positioning mechanism and the second positioning mechanism under the action of the moving mechanism. A rotary drive mechanism is mounted on the platform and acts simultaneously on the first positioning mechanism and the second positioning mechanism, so that the first positioning mechanism and the second positioning mechanism rotate in opposite directions synchronously. When the first positioning mechanism and the second positioning mechanism are flipped to a preset angle, the control unit controls the pipe positioning assembly on the first positioning mechanism to release the clamp on the tripod, and controls the frame clamping and fixing assembly on the second positioning mechanism to clamp and fix the tripod, so as to realize the transfer of the tripod between the first positioning mechanism and the second positioning mechanism.

2. The automatic welding equipment for bicycle frames according to claim 1, characterized in that, The rotary drive mechanism includes a drive cylinder, a U-shaped bar, and gears. The drive cylinder is fixed on the frame and located between the first positioning mechanism and the second positioning mechanism. The U-shaped bar is fixedly disposed at the telescopic end of the drive cylinder, and both ends of the U-shaped bar are provided with toothed surfaces. The first positioning mechanism and the second positioning mechanism are each fixed with a shaft on their respective sides, and each shaft is fixedly disposed with a gear at its end. The two gears mesh with the toothed surfaces at both ends of the U-shaped bar.

3. The automatic welding equipment for bicycle frames according to claim 1, characterized in that, The first positioning mechanism includes a first carrier plate, and the pipe positioning assembly includes a head pipe bidirectional clamping assembly, a five-way pipe tensioning and fixing assembly, a seat pipe pressing assembly, and an upper and lower pipe synchronous clamping mechanism disposed on the first carrier plate.

4. The automatic welding equipment for bicycle frames according to claim 3, characterized in that, The second positioning mechanism includes a second carrier plate, on which a five-way tube tensioning and fixing component and at least one frame clamping and fixing component are provided.

5. The automatic welding equipment for bicycle frames according to claim 3, characterized in that, The bidirectional clamping assembly for the head tube includes a transmission groove fixed to the upper surface of the first carrier plate, a bidirectional screw rotatably installed inside the transmission groove, and a clamping motor that drives the bidirectional screw to rotate. Each end of the transmission groove is provided with a sliding block that is threadedly engaged with the corresponding section of the bidirectional screw. Each of the two sliding blocks is provided with a clamping pressure block on the opposite side of its outer end extending out of the transmission groove.

6. The automatic welding equipment for bicycle frames according to claim 3, characterized in that, The upper and lower tube synchronous clamping mechanism includes a trapezoidal block, a first limiting stop, a second limiting stop, a first clamping bar, a second clamping bar, and a wedge-shaped pushing block. The trapezoidal block is fixed on the upper surface of the first carrier plate at the position corresponding to the internal gap of the tripod. The hypotenuse of the trapezoidal block is parallel to the lower tube of the tripod, and the vertical side is parallel to the upper tube of the tripod. The first limiting stop is located on the opposite side of the hypotenuse, and the second limiting stop is located on the opposite side of the vertical side. Both ends of the trapezoidal block are provided with storage slots. The first clamping bar and the second clamping bar are respectively movably disposed in the corresponding storage slots. The first clamping bar and the second clamping bar are each provided with a pressure rod passing through the storage slot, and a spring for resetting is sleeved on the pressure rod. The end of the pressure rod that extends into the inner cavity of the trapezoidal block is rotatably provided with an abutment wheel. The wedge-shaped pushing block is disposed in the inner cavity of the trapezoidal block, and a pushing cylinder for pushing the wedge-shaped pushing block is provided on the trapezoidal block.

7. The automatic welding equipment for bicycle frames according to claim 3, characterized in that, The seat tube clamping assembly includes a clamping cylinder fixed on a first carrier plate. The clamping cylinder is axially arranged along the seat tube in the tripod and is connected to a clamping end block.

8. The automatic welding equipment for bicycle frames according to claim 4, characterized in that, The five-way tube tensioning and fixing assembly includes a mechanical expansion shaft vertically disposed on the first or second carrier plate, and one end of the mechanical expansion shaft is connected to a driver.

9. The automatic welding equipment for bicycle frames according to claim 1, characterized in that, The moving mechanism includes two parallel slide rails and a screw rod disposed between the two slide rails, with one end of the screw rod connected to a screw motor; the multi-axis welding robot includes a robot body, the bottom of which is provided with a base that slides and engages with the two slide rails, and the base is provided with a screw hole block that interacts with the screw rod.

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