A laser cutting device for a bicycle frame tube

Abstract

The present application relates to a kind of bicycle frame pipe laser cutting device, belong to laser cutting device technical field.It includes body, the body is provided with profiled pipe fixed clamping assembly, the profiled pipe fixed clamping assembly clamps profiled pipe, the profiled pipe fixed clamping assembly is provided with follow-up rotating assembly, the body is provided with laser cutting structure, the laser cutting structure is provided with follow-up focusing assembly;The profiled pipe fixed clamping assembly is used to clamp and fix profiled pipe;The follow-up rotating assembly is used to drive profiled pipe to rotate around its own axis after clamping and fixing profiled pipe to cooperate with laser cutting operation.The present application can realize the deformationless clamping of elliptical profiled frame pipe, uniform speed rotation and synchronous focusing, strong anti-interference ability, cut section quality is stable, adapts to the batch laser cutting processing of bicycle profiled thin-walled pipe.

Description

Technical Field

[0001] This invention relates to the field of laser cutting equipment technology, and in particular to a laser cutting device for bicycle frame tubes. Background Technology

[0002] With the increasing demands for lightweight and aerodynamic performance in the bicycle industry, irregularly shaped thin-walled tubes such as elliptical cross-sections are widely used in core components such as the main beam and rear fork of the frame. Due to its high precision and non-contact characteristics, laser cutting has become the mainstream process for processing intersecting cuts at the ends of tubes and side wiring holes. Currently, conventional laser tube cutting equipment is mostly developed for standard round tubes, which has obvious shortcomings in the actual processing of irregularly shaped frame tubes.

[0003] Stable focus control during rotary cutting of elliptical tubes is challenging. As the tube rotates around its axis, the radial distance between the tube wall and the laser cutting head changes periodically with alternating major and minor axes. This can easily cause the focus to deviate from the optimal cutting plane of the tube wall, leading to problems such as excessive taper of the cut and significantly reducing the strength of the subsequent joint. Existing solutions often use capacitive sensors in conjunction with servo motors to achieve electronically controlled focusing. This not only results in high system costs but also causes the smoke and slag generated by laser cutting to easily contaminate the sensor probe. Under long-term operation, the detection accuracy drifts significantly, and the maintenance frequency is high, making it difficult to adapt to the complex working conditions of mass production in the workshop.

[0004] Therefore, this application provides a laser cutting device for bicycle frame tubes to meet the requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a laser cutting device for bicycle frame tubes, so as to solve the problem of difficulty in controlling the focus stability during the rotational cutting of elliptical tubes.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A laser cutting device for bicycle frame tubing includes a main body, on which a shaped tube fixing and clamping assembly is disposed, the shaped tube fixing and clamping assembly clamps the shaped tube, the shaped tube fixing and clamping assembly is disposed of a follow-up rotation assembly, the main body is disposed of a laser cutting structure, the laser cutting structure is disposed of a follow-up focusing assembly; the shaped tube fixing and clamping assembly is used to clamp and fix the shaped tube; the follow-up rotation assembly is used to drive the shaped tube to rotate around its own axis after the shaped tube is clamped and fixed to cooperate with the laser cutting operation; the follow-up focusing assembly is used to automatically focus the laser cutting structure in real time according to the change in distance between the outer wall of the shaped tube and the laser cutting structure during the rotation of the shaped tube.

[0007] Optionally, a cutting table is provided in the body, and an electric slide rail is provided on the table surface of the cutting table. A slider is slidably connected on the electric slide rail. The electric slide rail and the slider cooperate to drive the movable end of the irregular tube fixing clamping assembly to translate, thereby completing the clamping and fixing of the irregular tube.

[0008] Optionally, the irregular tube fixing and clamping assembly consists of two parts: a fixed clamping seat and a movable clamping seat. The fixed clamping seat is fixedly installed on the table surface of the cutting table, and the bottom of the movable clamping seat is fixedly installed on the slider. Both the fixed clamping seat and the movable clamping seat have a semi-circular structure. The electric slide rail drives the slider to move the movable clamping seat closer to or away from the fixed clamping seat, so that the fixed clamping seat and the movable clamping seat close or open.

[0009] Optionally, both the fixed clamping seat and the movable clamping seat are provided with a contoured fixing plate inside. Several elastic telescopic rods are fixedly connected inside the fixing plate, and a fixing clamp is installed at the end of each elastic telescopic rod.

[0010] Optionally, the side of the movable clamping seat is also provided with a limiting structure, which includes a limiting baffle and a ratchet. The ratchet is rotatably mounted on the limiting baffle and is used to engage unidirectionally with the teeth of the follow-up rotating component to limit its circumferential displacement in the non-working state.

[0011] Optionally, the follower rotation component includes a motor, the drive end of which is driven by a drive shaft, and a gear is fitted on the drive shaft.

[0012] Optionally, both the fixed clamping seat and the movable clamping seat are provided with rollers. A semi-annular rotating ring is slidably connected between the fixed clamping seat and the fixed plate through rollers. Another semi-annular rotating ring is slidably connected between the movable clamping seat and the fixed plate through rollers. Semi-annular racks are provided on the side end faces of both semi-annular rotating rings. The semi-annular rack on one side of the fixed clamping seat is meshed with a gear, and the semi-annular rack on one side of the movable clamping seat cooperates with a limiting structure to perform circumferential limiting.

[0013] Optionally, the laser cutting structure includes a telescopic cylinder mounted on the top of the main body. A cutting device is driven and connected to the bottom of the telescopic cylinder. A laser cutting head is provided at the bottom of the cutting device. A floating mechanism is provided between the cutting device and the laser cutting head. The floating mechanism includes an upper connecting plate and a lower connecting plate. The upper connecting plate is fixedly connected to the cutting device. A plurality of floating guide cylinders are provided at the bottom of the upper connecting plate. The lower connecting plate is fixedly connected to the laser cutting head. A plurality of floating guide rods are provided at the top of the lower connecting plate. Each of the floating guide rods is slidably connected inside a floating guide cylinder, so that the laser cutting head can float vertically.

[0014] Optionally, the follow-up focusing assembly includes a compensation cam sleeved on the drive shaft. The profile of the compensation cam has two protrusions symmetrically arranged. A movable plate is provided on one side of the compensation cam. One end of the movable plate abuts against the profile of the compensation cam. The other end of the movable plate is slidably connected inside the sliding seat. A transmission plate is fixedly connected to the movable plate. A transmission inclined surface is provided on the top surface of the transmission plate.

[0015] Optionally, the follow-up focusing assembly further includes a second transmission plate fixedly connected to the lower connecting plate. The second transmission plate is provided with a second transmission inclined surface. The first transmission inclined surface and the second transmission inclined surface are slidably connected. A transmission guide cylinder is fixedly connected to the table surface of the cutting table. The bottom end of the second transmission plate is slidably connected inside the transmission guide cylinder.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: In the above solution, by setting up a special-shaped tube fixing clamping component, a semi-circular seat body surrounds and clamps the tube. The inner side is equipped with multiple sets of elastic telescopic rods and fixing plates, which can adapt to the curvature difference of the major and minor axes of the elliptical tube. The force is uniform at each contact point, which avoids the problem of rigid claws clamping flat and thin-walled frame tubes, and also avoids the situation of slippage at the short axis position. With the electric slide rail driving the opening and closing, the loading and unloading operation is convenient. It can also adapt to special-shaped tubes of different specifications, and no additional tooling needs to be changed for production changeover.

[0017] By setting up a follow-up rotating component, the rotating ring is driven to rotate through direct meshing of gears with a semi-annular rack. The transmission angle is precise. Combined with the roller support rotating structure, the rotational resistance is small and the operation is smooth. It is not easy to vibrate during high-speed cutting. The symmetrical rotating rings at both ends jointly support the pipe, preventing the pipe from swinging or deflecting during rotation, ensuring a flatter cut surface, and also better cooperating with the focusing component to maintain a stable focal length, ensuring consistent processing.

[0018] By setting up a follow-up focusing component and adopting a mechanical structure in which the compensating cam and the drive shaft are linked coaxially, the cam completes one focusing cycle synchronously with the rotation of the tube. It keeps up with the change of distance during focusing in real time. The horizontal motion is converted into the vertical floating of the cutting head by relying on the inclined plane transmission. The structure is compact, has strong resistance to smoke and dust interference, can work stably in the workshop production environment, has low maintenance costs, and has high focus repeatability accuracy during batch processing. Attached Figure Description

[0019] Figure 1 A three-dimensional structural diagram of a laser cutting device for bicycle frame tubing; Figure 2 This is a schematic diagram of the three-dimensional structure of the cutting table; Figure 3 A three-dimensional structural diagram of the irregular tube fixing and clamping assembly; Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the diagram; Figure 5 Exploded view of the irregular tube fixing and clamping assembly; Figure 6 This is a schematic diagram of the three-dimensional structure of the laser-cut structure; Figure 7 for Figure 6 Enlarged schematic diagram of the structure at point B in the diagram; Figure 8 for Figure 6 Enlarged schematic diagram of the structure at point C; Figure 9 This is a schematic diagram of the three-dimensional structure of the follow-up focusing component; Figure 10 for Figure 9 A magnified schematic diagram of the structure at point D.

[0020] Figure label: 1. Body; 101. Cutting table; 102. Electric slide rail; 103. Slider; 2. Irregular tube fixing and clamping assembly; 201. Fixed clamping seat; 202. Moving clamping seat; 203. Fixing plate; 204. Elastic telescopic rod; 205. Fixed clamping plate; 206. Limiting structure; 207. Limiting baffle; 208. Ratchet; 3. Irregular tube fitting; 4. Follow-up rotating assembly; 401. Motor; 402. Drive shaft; 403. Gear; 404. Roller one; 405. Semi-circular rotating ring; 406. 5. Semi-circular rack; 6. Laser cutting structure; 7. Telescopic cylinder; 8. Cutting equipment; 9. Laser cutting head; 10. Floating mechanism; 11. Upper connecting plate; 12. Floating guide cylinder; 13. Lower connecting plate; 14. Floating guide rod; 15. Follow-up focusing assembly; 16. Compensating cam; 17. Moving plate; 18. Sliding seat; 19. Transmission plate one; 20. Transmission inclined plane one; 31. Transmission plate two; 42. Transmission inclined plane two; 53. Transmission guide cylinder. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0022] like Figures 1 to 10As shown, an embodiment of the present invention provides a laser cutting device for bicycle frame tubes, including a body 1, a shaped tube fixing and clamping assembly 2 on the body 1, the shaped tube fixing and clamping assembly 2 clamping the shaped tube 3, a follow-up rotation assembly 4 on the shaped tube fixing and clamping assembly 2, a laser cutting structure 5 on the body 1, and a follow-up focusing assembly 6 on the laser cutting structure 5. The shaped tube fixing and clamping assembly 2 is used to clamp and fix the shaped tube 3, the follow-up rotation assembly 4 is used to drive the shaped tube 3 to rotate around its own axis after the shaped tube 3 is clamped and fixed to cooperate with the laser cutting operation, and the follow-up focusing assembly 6 is used to automatically focus the laser cutting structure 5 in real time according to the change in distance between the outer wall of the shaped tube 3 and the laser cutting structure 5 when the shaped tube 3 rotates.

[0023] The laser cutting process for elliptical tubes of bicycle frames is specifically adapted to the use of the shaped tube fixing clamping component 2, the follow-up rotation component 4, and the follow-up focusing component 6. During the processing, the cutting head height does not need to be adjusted manually in the middle, and the optimal cutting focal length can be maintained throughout the process, reducing the adjustment workload of operators. At the same time, the cooperation of the follow-up rotation component 4 and the follow-up focusing component 6 improves the focusing accuracy during laser cutting, resulting in more uniform quality of the cut surface of batch processing and more stable fitting gap during subsequent frame welding.

[0024] like Figures 1 to 2 As shown, a cutting table 101 is provided inside the main body 1. An electric slide rail 102 is provided on the table surface of the cutting table 101. A slider 103 is slidably connected on the electric slide rail 102. The electric slide rail 102 and the slider 103 cooperate to drive the movable end of the special-shaped tube fixing clamping assembly 2 to translate, thereby completing the clamping and fixing of the special-shaped tube 3.

[0025] The electric slide rail 102 drives the clamping end to move horizontally. Both loading and unloading only require controlling the opening and closing of the slider 103, which is simple and direct to operate. Compared with the manually locked clamping structure, the electric slide rail 102 feeds more smoothly, and the clamping alignment accuracy is easier to control, making it less likely to cause the pipe fittings to be misaligned.

[0026] like Figures 3 to 5As shown, the irregular tube fixing and clamping assembly 2 consists of two parts: a fixed clamping seat 201 and a movable clamping seat 202. The fixed clamping seat 201 is fixedly installed on the table surface of the cutting table 101, and the bottom of the movable clamping seat 202 is fixedly installed on the slider 103. Both the fixed clamping seat 201 and the movable clamping seat 202 are semi-circular structures. The electric slide rail 102 drives the movable clamping seat 202 to move closer to or away from the fixed clamping seat 201 by driving the slider 103, so that the fixed clamping seat 201 and the movable clamping seat 202 close or open. Both the fixed clamping seat 201 and the movable clamping seat 202 are provided with a contour fixing plate 203. Several elastic telescopic rods 204 are fixedly connected inside the fixing plate 203, and a fixing clamping plate 205 is installed at the end of each elastic telescopic rod 204.

[0027] The tube is supported in all directions by using two semi-circular fixed clamping seats 201 and movable clamping seats 202 to clamp it. This provides better stability during rotational cutting and reduces the likelihood of it swinging. The structure of the inner elastic telescopic rod 204 and the fixed clamping plate 205 can adapt to the curvature difference of the major and minor axes of the elliptical tube. During clamping, each contact point can be evenly pressed against the tube wall. This prevents the thin-walled tube from being flattened due to excessive clamping at the major axis position or from slipping due to insufficient clamping at the minor axis position. This ensures clamping force while preventing damage to the thin-walled tube of the frame due to rigid clamping.

[0028] like Figure 5 As shown, the side of the movable clamping seat 202 is also provided with a limiting structure 206. The limiting structure 206 includes a limiting baffle 207 and a ratchet 208. The ratchet 208 is rotatably mounted on the limiting baffle 207. The ratchet 208 is used to engage with the teeth of the follower rotating component 4 in one direction to limit its circumferential displacement in the non-working state.

[0029] A ratchet 208 and a limiting structure 206 are provided on the side of the movable clamping seat 202 to limit the circumferential movement of the semi-annular rotating ring 405 in the non-working state. On the one hand, when the clamping seat is opened and closed, the rack on the movable side will not slide or misalign at will, and the two halves of the ring can be precisely aligned after they are closed, avoiding the problems of rack misalignment and transmission jamming. On the other hand, when the machine is stopped and materials are loaded, the pipe will not rotate at will due to external force, and the starting position of the cut is easier to align, reducing the initial alignment error.

[0030] like Figures 4 to 7As shown, the follower rotation assembly 4 includes a motor 401, and a drive shaft 402 is driven to the drive end of the motor 401. A gear 403 is sleeved on the drive shaft 402. Rollers 404 are provided inside both the fixed clamping seat 201 and the movable clamping seat 202. A semi-annular rotating ring 405 is slidably connected between the fixed clamping seat 201 and the fixed plate 203 through the rollers 404. Another semi-annular rotating ring 405 is slidably connected between the movable clamping seat 202 and the fixed plate 203 through the rollers 404. Semi-annular racks 406 are provided on the side end faces of both semi-annular rotating rings 405. The semi-annular rack 406 on one side of the fixed clamping seat 201 is meshed with the gear 403. The semi-annular rack 406 on one side of the movable clamping seat 202 cooperates with the limiting structure 206 to perform circumferential limiting.

[0031] The gear 403 directly drives the semi-annular rack 406 to rotate the rotating ring, which has a precise transmission angle. The rotating ring is supported by rollers and rotates inside the clamping seat. The rotational resistance is small, the operation is smoother, and it is not easy to vibrate during high-speed cutting. The symmetrical rotating rings at both ends jointly support the pipe fitting circumferentially. When the irregular pipe fitting 3 rotates, it is still firmly clamped and fixed to prevent it from swinging and ensure the flatness of the cut surface.

[0032] like Figures 6 to 10 As shown, the laser cutting structure 5 includes a telescopic cylinder 501 mounted on the top of the main body 1. The bottom of the telescopic cylinder 501 is driven and connected to a cutting device 502. A laser cutting head 503 is provided at the bottom of the cutting device 502. A floating mechanism 504 is provided between the cutting device 502 and the laser cutting head 503. The floating mechanism 504 includes an upper connecting plate 505 and a lower connecting plate 507. The upper connecting plate 505 is fixedly connected to the cutting device 502. Several floating guide cylinders 506 are provided at the bottom of the upper connecting plate 505. The lower connecting plate 507 is fixedly connected to the laser cutting head 503. Several floating guide rods 508 are provided at the top of the lower connecting plate. Each floating guide rod 508 is correspondingly slidably connected inside the floating guide cylinder 506, so that the laser cutting head 503 can float vertically.

[0033] The telescopic cylinder 501 drives the cutting equipment 502 to rise and fall as a whole, allowing it to quickly fall into place during processing and to lift and avoid obstacles when changing materials. This provides more space for loading and unloading, making operation safer. A floating mechanism 504 is added between the cutting head and the main body of the equipment, leaving vertical movement margin for the follow-up focusing component 6. During focusing, the cutting head can rise and fall smoothly along the transmission force without hard-top jamming. The cooperation between the floating guide rod 508 and the guide cylinder ensures that the cutting head always remains vertical and does not wobble, resulting in better verticality of the cut surface and no obvious taper of the cut.

[0034] like Figures 6 to 10As shown, the follow-up focusing assembly 6 includes a compensation cam 601 sleeved on the drive shaft 402. The contour surface of the compensation cam 601 is symmetrically provided with two protrusions. A movable plate 602 is provided on one side of the compensation cam 601. One end of the movable plate 602 abuts against the contour surface of the compensation cam 601. The other end of the movable plate 602 is slidably connected to the inside of the sliding seat 603. A transmission plate 604 is fixedly connected to the movable plate 602. A transmission inclined surface 605 is provided on the top surface of the transmission plate 604.

[0035] The compensation cam 601 and drive shaft 402 are coaxially installed. The cam rotates synchronously while the pipe rotates. Through mechanical linkage, it keeps up with the changes in distance during focusing in real time. The smoke and slag generated by laser cutting will not affect its working stability. It has strong anti-interference ability, is more suitable for workshop production environment, and is easier to maintain. The cam profile is symmetrically set with two protrusions, which correspond to the two distance changes of the major and minor axes of the elliptical pipe. The compensation amount and the pipe profile have a high degree of matching, and the focusing is more accurate.

[0036] like Figures 8 to 10 As shown, the follow-up focusing assembly 6 also includes a second transmission plate 606 fixedly connected to the lower connecting plate 507. The second transmission plate 606 is provided with a second transmission inclined surface 607. The first transmission inclined surface 605 is slidably connected to the second transmission inclined surface 607. A transmission guide cylinder 608 is fixedly connected to the table surface of the cutting table 101. The bottom end of the second transmission plate 606 is slidably connected inside the transmission guide cylinder 608.

[0037] Through the cooperation of the first transmission inclined surface 605 and the second transmission inclined surface 607, the horizontal reciprocating motion brought by the cam is directly converted into the vertical lifting motion of the cutting head. The transmission guide cylinder 608 restricts the movement direction of the second transmission plate 606, ensuring that it can only move in the vertical direction and will not wobble to the left or right. The lifting process of focusing is more stable and the repeatability of the focal point position is higher.

[0038] The working principle of the technical solution provided by this invention is as follows: In the initial processing state, the movable clamping seat 202 stops at the far end of the electric slide rail 102 along with the slider 103, fully opening with the fixed clamping seat 201, leaving sufficient space for loading. The elliptical irregular tube 3 to be processed is placed into the semi-annular inner cavity of the fixed clamping seat 201 by manual or robotic arm. The outer wall of the tube initially rests against the inner fixed clamping plate 205 to complete the initial positioning. Then the electric slide rail 102 is started, driving the slider 103 to move the movable clamping seat 202 smoothly to one side of the fixed clamping seat 201 until the two seats are closed to form a complete annular clamping cavity.

[0039] During the encirclement process, multiple sets of elastic telescopic rods 204 on the inner contoured fixing plate 203 of the fixed clamping seat 201 and the movable clamping seat 202 are synchronously compressed by force. The fixing plate 205 at the end of each telescopic rod will adaptively adjust the amount of extension and contraction according to the curvature of the elliptical tube wall. The telescopic rod at the position corresponding to the long axis has a larger compression stroke, and the position corresponding to the short axis has a smaller compression stroke. Relying on the elastic reaction force, each contact point is pressed tightly against the tube wall with uniform pressure, which not only ensures sufficient clamping force and avoids slippage and displacement during rotation, but also avoids excessive local stress like rigid claws, effectively protecting the thin-walled tube from being crushed and deformed.

[0040] As the fixed clamping seat 201 and the movable clamping seat 202 close together, the two semi-annular rotating rings 405 inside them also simultaneously assemble into a complete rotating ring. The semi-annular rack 406 on the fixed side meshes with the drive gear 403, while the semi-annular rack 406 on the movable side engages with the ratchet 208 of the limiting structure 206. The ratchet 208 adopts a one-way meshing design, which allows the pipe to swing with the tooth shape when the pipe rotates in the forward direction without hindering normal rotation. Only in non-working states such as when the machine is stopped or when loading materials, the reverse movement of the rack is restricted, ensuring that the teeth are accurately aligned after the two semi-annular racks are closed, and there will be no problems of misalignment, offset, or jamming.

[0041] After clamping, the telescopic cylinder 501 at the top of the main body 1 extends, driving the cutting device 502 to descend as a whole, so that the laser cutting head 503 falls to the initial working height above the pipe. At this time, the floating mechanism 504 is in a natural hanging state, and the floating guide rod 508 is at the bottom of the floating guide cylinder 506 under its own gravity. The bottom end of the transmission plate 606 is inserted into the transmission guide cylinder 608. The transmission inclined surface 607 on the transmission plate 606 moves down from above the transmission inclined surface 605 until it is in close contact with the transmission inclined surface 605 on the top surface of the transmission plate 604.

[0042] After the preparation is completed, start the motor 401. The motor 401 drives the gear 403 to rotate at a constant speed through the drive shaft 402. The gear 403 meshes with the semi-annular rack 406 to drive the semi-annular rotating ring 405 to rotate smoothly under the support of the roller 404. The rotating ring holds the pipe through the inner elastic telescopic rod 204 and the fixed clamp 205, and finally drives the elliptical special-shaped pipe 3 to rotate at a constant speed around its own axis. The rotating rings arranged symmetrically at both ends jointly support the pipe, preventing the special-shaped pipe 3 from swinging and deflecting, and ensuring the consistency of the cut section.

[0043] As the pipe rotates, the compensation cam 601, which is fixedly sleeved on the drive shaft 402, rotates in complete synchronization with the drive shaft 402. For every one rotation of the pipe, the cam also rotates one revolution in sync, ensuring that the focusing action and the distance change of the pipe cross section are consistent from the transmission source.

[0044] As the apex of the major axis of the elliptical tube gradually rotates to the position directly opposite the laser cutting head 503, the distance between the tube wall and the cutting nozzle gradually decreases. At this time, the protruding profile of the compensating cam 601 rotates synchronously to one side of the moving plate 602, pushing the moving plate 602 to move horizontally towards the sliding seat 603. The transmission plate 604 moves synchronously with the moving plate 602, and the transmission inclined surface 605 on it slides relative to the transmission inclined surface 607. The transmission inclined surface 607 moves from the bottom of the transmission inclined surface 605 to the top, converting the horizontal thrust into a vertical upward lifting force, pushing the transmission plate 606 to rise vertically along the transmission guide cylinder 608, thereby causing the lower connecting plate 507 and the laser cutting head 503 to float upward as a whole. During the floating process, the floating guide rod 508 slides upward along the floating guide cylinder 506, always limiting the movement direction of the cutting head to the vertical direction, preventing left and right swaying, and ensuring the perpendicularity of the cut section.

[0045] As the pipe continues to rotate, the apex of the long axis gradually deviates from the cutting position, while the position of the short axis gradually moves to face the cutting head. The distance between the pipe wall and the nozzle gradually increases. At this time, the convex contour of the compensation cam 601 gradually rotates, and the thrust on the moving plate 602 continuously weakens. The moving plate 602 moves horizontally in the direction of the compensation cam 601. The transmission plate 604 moves synchronously with the moving plate 602. The transmission inclined plane 607 returns to the bottom from the top of the transmission inclined plane 605. The transmission plate 606 descends vertically along the transmission guide cylinder 608, thereby causing the lower connecting plate 507 and the laser cutting head 503 to float downward as a whole. Through this purely mechanical linkage compensation, the distance fluctuation caused by the elliptical cross section is offset in real time as the pipe rotates. Throughout the cutting process, the laser focus is stably placed on the optimal cutting plane of the pipe wall, cutting out a qualified cross section.

[0046] After the laser cutting structure 5 completes its work, the motor 401 stops running, the irregular tube 3 stops rotating, the laser cutting head 503 shuts off its light output, and the telescopic cylinder 501 drives the cutting equipment 502 to move upward and reset, raising it to a safe height to leave operating space for unloading. Then, the electric slide rail 102 reverses the drive of the slider 103, causing the moving clamping seat 202 to move away from the fixed clamping seat 201, the clamping cavity opens, and the elastic telescopic rod 204 resets and releases the tube, allowing the processed frame tube to be taken out, and then the next piece of the loading and processing cycle begins.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A laser cutting device for bicycle frame tubes, characterized in that, Includes a body (1), on which a special-shaped tube fixing clamping assembly (2) is provided, the special-shaped tube fixing clamping assembly (2) clamps a special-shaped tube (3), the special-shaped tube fixing clamping assembly (2) is provided with a follow-up rotation assembly (4), the body (1) is provided with a laser cutting structure (5), the laser cutting structure (5) is provided with a follow-up focusing assembly (6); The irregular tube fixing clamping assembly (2) is used to clamp and fix the irregular tube fitting (3); The following rotation component (4) is used to drive the irregular tube (3) to rotate around its own axis after the irregular tube (3) is clamped and fixed to cooperate with the laser cutting operation; The follow-up focusing component (6) is used to automatically focus the laser cutting structure (5) in real time according to the change in distance between the outer wall of the irregular tube (3) and the laser cutting structure (5) when the tube rotates.

2. The laser cutting device for bicycle frame tubes according to claim 1, characterized in that, The main body (1) is provided with a cutting table (101), and an electric slide rail (102) is provided on the table surface of the cutting table (101). A slider (103) is slidably connected on the electric slide rail (102). The electric slide rail (102) and the slider (103) cooperate to drive the movable end of the special-shaped tube fixing clamping assembly (2) to translate, thereby completing the clamping and fixing of the special-shaped tube (3).

3. The laser cutting device for bicycle frame tubes according to claim 2, characterized in that, The irregular tube fixing clamping assembly (2) consists of two parts: a fixed clamping seat (201) and a movable clamping seat (202). The fixed clamping seat (201) is fixedly installed on the table surface of the cutting table (101), and the bottom of the movable clamping seat (202) is fixedly installed on the slider (103). Both the fixed clamping seat (201) and the movable clamping seat (202) are semi-circular structures. The electric slide rail (102) drives the movable clamping seat (202) to move closer to or away from the fixed clamping seat (201) by driving the slider (103), so that the fixed clamping seat (201) and the movable clamping seat (202) close or open.

4. The laser cutting device for bicycle frame tubes according to claim 3, characterized in that, Both the fixed clamping seat (201) and the movable clamping seat (202) are provided with a contoured fixing plate (203). Several elastic telescopic rods (204) are fixedly connected inside the fixing plate (203), and a fixing clamp (205) is installed at the end of each elastic telescopic rod (204).

5. The laser cutting device for bicycle frame tubes according to claim 4, characterized in that, The movable clamping seat (202) is also provided with a limiting structure (206) on its side. The limiting structure (206) includes a limiting baffle (207) and a ratchet (208). The ratchet (208) is rotatably mounted on the limiting baffle (207). The ratchet (208) is used to engage unidirectionally with the teeth of the follow-up rotating assembly (4) to limit its circumferential displacement in the non-working state.

6. The laser cutting device for bicycle frame tubes according to claim 5, characterized in that, The follow-up rotating component (4) includes a motor (401), the drive end of which is connected to a drive shaft (402), and a gear (403) is fitted on the drive shaft (402).

7. The laser cutting device for bicycle frame tubes according to claim 6, characterized in that, Both the fixed clamping seat (201) and the movable clamping seat (202) are equipped with rollers (404). A semi-annular rotating ring (405) is slidably connected between the fixed clamping seat (201) and the fixed plate (203) through rollers (404). Another semi-annular rotating ring (405) is slidably connected between the movable clamping seat (202) and the fixed plate (203) through rollers (404). A semi-annular rack (406) is provided on the side end face of both semi-annular rotating rings (405). The semi-annular rack (406) on one side of the fixed clamping seat (201) is meshed with the gear (403). The semi-annular rack (406) on one side of the movable clamping seat (202) cooperates with the limiting structure (206) to perform circumferential limiting.

8. The laser cutting device for bicycle frame tubes according to claim 7, characterized in that, The laser cutting structure (5) includes a telescopic cylinder (501) installed on the top of the main body (1). The bottom of the telescopic cylinder (501) is connected to a cutting device (502). The bottom of the cutting device (502) is provided with a laser cutting head (503). A floating mechanism (504) is provided between the cutting device (502) and the laser cutting head (503). The floating mechanism (504) includes an upper connecting plate (505) and a lower connecting plate (507). The upper connecting plate (505) is fixedly connected to the cutting device (502). The bottom of the upper connecting plate (505) is provided with a plurality of floating guide cylinders (506). The lower connecting plate is fixedly connected to the laser cutting head (503). The top of the lower connecting plate is provided with a plurality of floating guide rods (508). Each of the floating guide rods (508) is slidably connected inside the floating guide cylinder (506) so that the laser cutting head (503) can float vertically.

9. The laser cutting device for bicycle frame tubes according to claim 8, characterized in that, The follow-up focusing assembly (6) includes a compensation cam (601) sleeved on the drive shaft (402). The contour surface of the compensation cam (601) is symmetrically provided with two protrusions. A movable plate (602) is provided on one side of the compensation cam (601). One end of the movable plate (602) abuts against the contour surface of the compensation cam (601). The other end of the movable plate (602) is slidably connected inside the sliding seat (603). A transmission plate (604) is fixedly connected to the movable plate (602). A transmission inclined surface (605) is provided on the top surface of the transmission plate (604).

10. The laser cutting device for bicycle frame tubes according to claim 9, characterized in that, The follow-up focusing assembly (6) also includes a second transmission plate (606) fixedly connected to the lower connecting plate (507). The second transmission plate (606) is provided with a second transmission inclined surface (607). The first transmission inclined surface (605) is slidably connected to the second transmission inclined surface (607). A transmission guide cylinder (608) is fixedly connected to the table surface of the cutting table (101). The bottom end of the second transmission plate (606) is slidably connected inside the transmission guide cylinder (608).

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