A laser cutting device for metal tubes

Abstract

This invention relates to the field of laser cutting technology and discloses a metal tube laser cutting device, including a guide rail, an auxiliary support device on one side of the guide rail, a metal tube placed on the auxiliary support device, a clamping and rotating drive mechanism, and a laser cutting mechanism. The laser cutting mechanism includes height-adjustable mounting seats located on both sides of the metal tube. A laser cutting head for cutting the sidewalls of the metal tube and a grinding head for grinding the ends of the metal tube are respectively mounted on opposite sides of the two mounting seats. This invention, by incorporating a laser cutting mechanism with grinding heads between two clamping and rotating drive mechanisms, allows the metal tube to undergo immediate end deburring via the grinding heads after laser cutting, eliminating the need for repeated clamping, effectively reducing process steps and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, specifically a metal tube laser cutting device. Background Technology

[0002] In existing laser cutting technology, a high-power laser beam, after being focused by an optical path system, can form a micron-sized spot, heating the metal material to its melting or boiling point in an extremely short time, achieving instantaneous melting and vaporization. Combined with a multi-axis linkage control system, this technology can precisely complete various complex cutting tasks such as cutting, drilling, beveling, and intersecting line processing of metal pipes. Compared to traditional machining methods, laser cutting is a non-contact process, offering significant technical advantages such as a minimal heat-affected zone, high processing precision, and excellent cut quality.

[0003] However, currently widely used laser tube cutting equipment relies primarily on process parameter optimization to control burr formation during the cutting process, making it difficult for the equipment itself to effectively remove burrs. After cutting, if burrs remain at the cut edge, manual scraping or specialized deburring equipment is usually required for post-processing. This reliance on external methods for burr removal not only increases the number of steps in metal tube processing but also limits overall processing efficiency. Therefore, there is still room for improvement in the burr handling capabilities of existing laser tube cutting devices. Summary of the Invention

[0004] This invention provides a metal tube laser cutting device that solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A metal tube laser cutting device includes a guide rail, an auxiliary support device on one side of the guide rail, a metal tube placed on the auxiliary support device, and a clamping and rotating drive mechanism and a laser cutting mechanism.

[0007] Two clamping rotary drive mechanisms are provided, one in the middle of the guide rail and the other on the side away from the auxiliary support device. The two clamping rotary drive mechanisms are used to drive the clamped metal tube to rotate and feed axially.

[0008] The laser cutting mechanism is located on the side of the clamping and rotating drive mechanism located in the middle of the guide rail away from the center of the guide rail. It includes mounting seats that are respectively disposed on both sides of the metal tube and are height adjustable. On the opposite side of the two mounting seats, there are laser cutting heads for cutting the sidewalls of the metal tube and grinding heads for grinding the ends of the metal tube.

[0009] As a preferred embodiment of the present invention, the laser cutting mechanism includes a first base plate fixedly connected to a guide rail, a vertical plate provided on the side of the first base plate, a lifting frame provided on the side of the vertical plate near the metal tube, a lifting drive assembly for driving the lifting frame to move up and down provided in the middle of the vertical plate, the lifting frame being a U-shaped structure with its opening facing the metal tube, the metal tube passing through the interior of the lifting frame, and the two ends of the lifting frame being connected to the mounting base.

[0010] As a preferred embodiment of the present invention, a sliding rod is slidably connected to the end of the lifting frame, and the end of the sliding rod near the metal tube is fixedly connected to the mounting base. A buffer spring is provided between the mounting base and the lifting frame. A positioning roller is rotatably connected to the end of the mounting base near the metal tube feed. When the positioning roller, which is located on the same mounting base as the laser cutting head, abuts against the side wall of the metal tube, the distance between the laser cutting head and the side wall of the metal tube is a preset cutting distance. When the positioning roller, which is located on the same mounting base as the grinding head, abuts against the side wall of the metal tube, the grinding position of the grinding head is flush with the end of the metal tube.

[0011] As a preferred embodiment of the present invention, the lifting drive assembly includes a slide groove formed on the upright plate, a slider that is slidably connected to the lifting frame in the slide groove, a lifting screw that is threadedly connected to the slider on the side of the upright plate away from the metal tube, and a guide post that is slidably engaged with the slider on the side of the upright plate close to the metal tube.

[0012] As a preferred embodiment of the present invention, the clamping rotary drive mechanism includes a second base plate fixedly connected to the guide rail, a support frame is provided on the second base plate, and a rotating sleeve is rotatably connected to the side of the support frame away from the second base plate via a slewing bearing. A rotary drive device for driving the rotating sleeve to rotate is provided in the middle of the support frame. The axis of the rotating sleeve coincides with the center line of the metal tube. A feeding drive assembly for driving the axial feed of the metal tube is provided on the side of the two rotating sleeves that are far apart from each other, and a clamping assembly for clamping the metal tube is provided on the side of the two rotating sleeves that are close to each other.

[0013] As a preferred embodiment of the present invention, the feeding drive assembly includes sliding sleeves symmetrically arranged on both sides of the inner wall of the rotating sleeve. The sliding sleeves are slidably connected to a sliding rod. A first mounting frame is fixedly connected to one end of the sliding rod near the center of the rotating sleeve. A feeding roller is rotatably connected to the first mounting frame. The axis of the feeding roller is perpendicular to the axis of the rotating sleeve. A spring is provided inside the sliding sleeve to drive the sliding rod to move towards the center of the rotating sleeve. A separation device is provided on the inner wall of the rotating sleeve to drive the two first mounting frames to separate from each other.

[0014] As a preferred embodiment of the present invention, the separation device includes a connecting rod rotatably connected to the end of the first mounting frame, and the ends of the two connecting rods away from the first mounting frame are respectively rotatably connected to the two ends of the push plate. The inner wall of the rotating sleeve is provided with a separation cylinder, and the piston rod of the separation cylinder is connected to an L-shaped support rod that cooperates with the push plate.

[0015] As a preferred embodiment of the present invention, the clamping assembly includes four fixing plates disposed at the ends of the rotating sleeve. A clamping top rod is slidably connected to the end of the fixing plate. A second mounting frame is fixedly connected to one end of the clamping top rod near the center of the rotating sleeve. A clamping roller is rotatably connected to the second mounting frame. The axis of the clamping roller is perpendicular to the axis of the rotating sleeve. The four clamping rollers are distributed at equal angular intervals along the circumference of the rotating sleeve, and adjacent clamping rollers are perpendicular to each other. Two pairs of opposing clamping rollers are staggered from each other in the axial direction of the rotating sleeve. A clamping drive device is disposed on the outer side of the rotating sleeve to drive the clamping rollers to move towards the center of the rotating sleeve.

[0016] As a preferred embodiment of the present invention, the clamping drive device includes a stop rod sleeved on the end of the clamping top rod away from the center of the rotating sleeve. A return spring is provided between the stop rod and the fixed plate to drive the clamping top rod to move away from the center of the rotating sleeve. A synchronizing ring is provided on the outer side of the rotating sleeve, and an inclined top block is provided on the inner side of the synchronizing ring. When the synchronizing ring moves axially, the inclined top block drives the stop rod to move closer to the center of the rotating sleeve. An ejector cylinder is provided on the inner wall of the rotating sleeve to drive the synchronizing ring to move axially. The clamping top rod includes an adjusting rod slidably connected to the fixed plate. An adjusting sleeve is threadedly connected to the side of the adjusting rod near the center of the rotating sleeve. An adjusting nut that cooperates with the adjusting sleeve is threadedly connected to the outer side of the adjusting rod. The second mounting frame is fixedly connected to the end of the adjusting sleeve near the center of the rotating sleeve.

[0017] As a preferred embodiment of the present invention, both the outer wall of the feeding roller and the outer wall of the clamping roller are provided with anti-slip knurling. The anti-slip knurling on the outer wall of the clamping roller is arranged along the circumference of the clamping roller and distributed in an array along its axial direction. The anti-slip knurling on the outer wall of the feeding roller is arranged along the axial direction of the feeding roller and distributed around its central circumference.

[0018] The present invention has the following advantages:

[0019] 1. By integrating the cutting mechanism and the grinding mechanism into the same processing station, the end deburring process can be carried out immediately after the metal tube is cut, without the need for additional workpiece transfer or repeated clamping. This effectively shortens the process flow time, eliminates the positioning error caused by secondary positioning, and significantly improves processing efficiency and processing accuracy.

[0020] 2. Two clamping and rotating drive mechanisms are respectively set on both sides of the cutting station, which can clamp both ends of the metal tube at the same time during the cutting process. Especially for long tubes, it can effectively avoid bending deformation of the free end due to gravity or cutting thermal stress, ensure the perpendicularity of the cutting section to the tube axis and the accuracy of the intersection line contour, and improve the cutting quality.

[0021] 3. Through the coordinated operation of the lifting drive assembly and the positioning roller, the laser cutting head and the grinding head can adaptively adjust their heights according to process requirements, and utilize buffer springs to achieve elastic contact with the pipe wall, ensuring a constant cutting spacing and grinding position. Combined with the differentiated design of the anti-slip knurling on the surfaces of the feeding roller and clamping roller, the axial feed and circumferential rotation movements do not interfere with each other, achieving precise control of the pipe's movement during cutting and grinding. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a metal tube laser cutting device.

[0024] Figure 2 This is a schematic diagram of the laser cutting mechanism in a metal tube laser cutting device.

[0025] Figure 3 This is a right view of the laser cutting mechanism in a metal tube laser cutting device.

[0026] Figure 4 This is a schematic diagram of the clamping and rotating drive mechanism in a metal tube laser cutting device.

[0027] Figure 5 This is a schematic diagram of the structure of a metal tube laser cutting device after the protective cover is removed from the clamping and rotating drive mechanism.

[0028] Figure 6 This is a schematic diagram of the feeding drive component in a metal tube laser cutting device.

[0029] Figure 7 This is a left view of a feeding drive assembly in a metal tube laser cutting device.

[0030] Figure 8 This is a schematic diagram of the clamping component in a metal tube laser cutting device.

[0031] Figure 9 This is a schematic diagram of the structure of a metal tube laser cutting device with four clamping rollers staggered.

[0032] Figure 10 This is a schematic diagram of the structure of a clamping roller pressing against a metal tube in a metal tube laser cutting device.

[0033] Figure 11 This is a schematic diagram of the auxiliary support device in a metal tube laser cutting device.

[0034] In the diagram: 1. Guide rail; 2. Auxiliary support device; 3. Metal tube; 4. Clamping and rotating drive mechanism; 5. Laser cutting mechanism; 6. First base plate; 7. Vertical plate; 8. Lifting frame; 9. Mounting base; 10. Grinding head; 11. Positioning roller; 12. Laser cutting head; 13. Slide groove; 14. Slider; 15. Lifting screw; 16. Guide column; 17. Lifting drive assembly; 18. Sliding rod; 19. Buffer spring; 20. Clearance through hole; 21. Second base plate; 22. Protective cover; 23. Support frame; 24. Rotary bearing; 25. Rotating drive device; 26. Rotating sleeve; 27. Feeding drive assembly; 28. Clamping assembly; 29. ​​Sliding sleeve; 30. 31. Slide rod; 32. First mounting frame; 33. Separation device; 34. Feeding roller; 35. Anti-slip knurling; 36. Separation cylinder; 37. L-shaped support rod; 38. Push plate; 39. Connecting rod; 40. Synchronous ring; 41. Inclined top block; 42. Stop rod; 43. Return spring; 44. Support plate; 45. Ejection cylinder; 46. Positioning rod; 47. Clamping drive device; 48. Fixing plate; 49. Clamping top rod; 50. Second mounting frame; 51. Clamping roller; 52. Adjusting sleeve; 53. Adjusting nut; 54. Adjusting rod; 55. Third base plate; 56. Tension spring; 57. Column; 58. Slip ring; 59. Top rod; 60. Deflection arm; 51. Lifting roller. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In one embodiment, see Figure 1 and Figure 2A metal tube laser cutting device includes a guide rail 1, which is composed of two parallel channel steels extending horizontally. To improve the stability of the overall structure, the channel steels can be directly buried in the ground and fixed by concrete pouring. Multiple auxiliary support devices 2 are evenly distributed on the left side of the upper surface of the guide rail 1 to support the metal tube 3. The metal tube 3 is placed above the auxiliary support devices 2 along the length of the guide rail 1. This device is suitable for various tubes with circular, rectangular, or square cross-sections. The auxiliary support devices 2 ensure that the metal tube 3 remains straight during processing. The device also includes a clamping and rotating drive mechanism 4 and a laser cutting mechanism 5.

[0037] Two clamping rotary drive mechanisms 4 are provided. One is installed in the middle or slightly to the right of the guide rail 1, and the other is installed at the right end of the guide rail 1. The specific positions can be adjusted according to actual processing requirements, as long as both clamping rotary drive mechanisms 4 are located in the middle and right side areas of the guide rail 1. Both clamping rotary drive mechanisms 4 can clamp the metal tube 3 and drive it to move axially.

[0038] The laser cutting mechanism 5 is positioned between two clamping and rotating drive mechanisms 4, and is relatively close to the left clamping and rotating drive mechanism 4, thereby enabling the metal tube 3 extending from the left clamping and rotating drive mechanism 4 to be effectively cut. The laser cutting mechanism 5 includes mounting seats 9 located on the upper and lower sides of the metal tube 3. The upper mounting seat 9 is equipped with a laser cutting head 12 for laser cutting the sidewall of the metal tube 3, and the lower mounting seat 9 is equipped with a grinding head 10 for grinding the end of the metal tube 3. The height of both mounting seats 9 is adjustable. When the laser cutting head 12 descends for cutting, the grinding head 10 descends synchronously to avoid interfering with the metal tube 3; conversely, when the grinding head 10 rises for grinding, the laser cutting head 12 rises synchronously.

[0039] In one instance of this embodiment, please refer to Figure 1 , Figure 2 and Figure 3 The laser cutting mechanism 5 includes a first base plate 6 arranged perpendicular to the guide rail 1, which is fixed to the guide rail 1 by bolts or welding. A vertical support plate 7 is vertically arranged at the rear end of the first base plate 6, and a lifting frame 8 is mounted on the front side of the support plate 7. The lifting frame 8 has a U-shaped structure with its opening facing forward, and a metal tube 3 passes horizontally through the middle of the lifting frame 8. A lifting drive assembly 17 for driving the lifting frame 8 to move up and down is provided on the support plate 7. The upper and lower ends of the lifting frame 8 are respectively connected to corresponding mounting seats 9, thereby driving the mounting seats 9 to rise and fall synchronously.

[0040] The lifting frame 8 has vertically arranged sliding rods 18 slidably connected to both its upper and lower ends. The end of the sliding rod 18 near the metal tube 3 is fixedly connected to the mounting base 9. To improve movement stability, each mounting base 9 has a sliding rod 18 on its front and rear sides, which slides in cooperation with the lifting frame 8. A buffer spring 19 is provided between the lifting frame 8 and the mounting base 9, and the buffer spring 19 is sleeved on the outside of the sliding rod 18. A positioning roller 11 is rotatably connected to the left side of each mounting base 9, near the metal tube 3. When the upper mounting base 9 moves downward, the positioning roller 11 abuts against the upper surface of the metal tube 3. At this time, the distance between the laser cutting head 12 and the upper surface of the metal tube 3 is exactly equal to the preset cutting distance, ensuring cutting accuracy. During the rotation of the metal tube 3, the positioning roller 11 can adaptively float up and down with the undulation of the tube wall, and the buffer spring 19 will deform accordingly, keeping the distance between the laser cutting head 12 and the metal tube 3 constant. Similarly, when the lower mounting base 9 moves upward, the lower positioning roller 11 abuts against the lower surface of the metal tube 3. The grinding head 10 is a rotating cylindrical structure with a concave center, and its concave part fits precisely with the end of the metal tube 3. A drive motor can be installed at the lower part of the mounting base 9 to make the grinding head 10 rotate at high speed, thereby grinding the end of the metal tube 3, removing burrs and rounding it.

[0041] The lifting drive assembly 17 includes a vertical groove 13 formed in the middle of the upright plate 7, and a slider 14 slidably disposed within the groove 13. A vertically arranged lifting screw 15 is rotatably connected to the rear side of the upright plate 7, and the rear end of the slider 14 is threadedly engaged with the lifting screw 15. When the lifting screw 15 rotates, it drives the slider 14 to move up and down along the groove 13. A drive motor can be installed on the lower part of the rear side of the upright plate 7 to drive the lifting screw 15 to rotate. To further improve lifting stability, a guide post 16 is vertically arranged on the front side of the upright plate 7. The upper and lower ends of the guide post 16 are fixedly connected to the upright plate 7, and the middle part is slidably engaged with the front side of the slider 14.

[0042] In one instance of this embodiment, please refer to Figure 1 , Figure 4 and Figure 5The clamping and rotating drive mechanism 4 includes a second base plate 21 fixedly connected to the guide rail 1. The second base plate 21 is arranged perpendicular to the guide rail 1 and fixed to the guide rail 1 by bolts or welding. Support frames 23 are provided on both the front and rear sides of the upper surface of the second base plate 21, and reinforcing ribs are provided between the two support frames 23 to improve structural strength. The upper end of the support frame 23 is fixedly connected to the outer ring of the slewing bearing 24, and the inner ring of the slewing bearing 24 is fixedly connected to the outer wall of the rotating sleeve 26, thereby enabling the rotating sleeve 26 to rotate freely around its own axis. A rotating drive device 25 is provided in the middle of the support frame 23. This device includes a gear ring sleeved on the outer wall of the rotating sleeve 26 and a drive motor installed in the middle of the support frame 23. The drive motor drives the gear ring to rotate through gear transmission, thereby driving the rotating sleeve 26 to rotate. Given the high accuracy requirement of the rotation angle of the metal tube 3, the motor is preferably a servo motor or a stepper motor. The axis of the rotating sleeve 26 coincides with the centerline of the metal tube 3, allowing the metal tube 3 to pass through the center of the rotating sleeve 26. Each of the two clamping rotating drive mechanisms 4 has a feeding drive assembly 27 for driving the axial feed of the metal tube 3 on the side of the rotating sleeve 26 furthest from each other, and a clamping assembly 28 for clamping the metal tube 3 on the side of the two rotating sleeves 26 closest to each other. To prevent waste generated during cutting or grinding from flying into the mechanism and causing damage, a protective cover 22 can be installed on the outside of the clamping rotating drive mechanism 4. The protective cover 22 has a clearance through hole 20 for the metal tube 3 to pass through.

[0043] In one instance of this embodiment, please refer to Figure 5 , Figure 6 and Figure 7 Taking the clamping and rotating drive mechanism 4 on the left as a directional reference, the feeding drive assembly 27 includes a sliding sleeve 29 disposed on the inner wall of the rotating sleeve 26. The sliding sleeves 29 are symmetrically arranged inside the rotating sleeve 26, and to improve stability, two sliding sleeves 29 are disposed on the same side of the rotating sleeve 26. A sliding rod 30 is slidably connected inside the sliding sleeve 29, and a spring is provided inside the sliding sleeve 29. The spring always applies a thrust to the sliding rod 30 toward the center of the rotating sleeve 26. A first mounting frame 31 is fixedly connected to the end of the sliding rod 30 away from the sliding sleeve 29, and a feeding roller 33 is rotatably connected inside the first mounting frame 31. The axis of the feeding roller 33 is perpendicular to the axis of the rotating sleeve 26. A drive motor can be disposed at the front end of one of the first mounting frames 31. The motor drives the feeding roller 33 to rotate, thereby realizing the axial feeding of the metal tube 3. The motor is preferably a servo motor or a stepper motor, or motors can be disposed at the ends of the first mounting frames 31 on the upper and lower sides respectively. The inner wall of the rotating sleeve 26 is also provided with a separation device 32, which is used to simultaneously drive the two feeding rollers 33 to separate from each other, so as to facilitate the insertion of the metal tube 3.

[0044] The separation device 32 includes a separation cylinder 35 fixed to the inner wall of the rotating sleeve 26. An L-shaped support rod 36 is fixedly connected to the piston rod end of the separation cylinder 35. A connecting rod 38 is rotatably connected to the rear end of the first mounting frame 31 (i.e., the side away from the motor). The other ends of the two connecting rods 38 located on the same side of the rotating sleeve 26 are respectively rotatably connected to the two ends of the push plate 37. The L-shaped support rod 36 has an L-shaped structure, with its right end fixedly connected to the piston rod of the separation cylinder 35 and its left end located on the side of the push plate 37 away from the center of the rotating sleeve 26. When the piston rod of the separation cylinder 35 extends, the L-shaped support rod 36 abuts against the side of the push plate 37 and pushes the push plate 37 to move. The push plate 37 drives the two first mounting frames 31 to separate from each other through the connecting rod 38, thereby separating the feeding roller 33. When the piston rod of the separating cylinder 35 retracts, the L-shaped support rod 36 disengages from the push plate 37. Under the action of the spring inside the sliding sleeve 29, the feeding roller 33 moves towards the center of the rotating sleeve 26 and abuts against both sides of the metal tube 3. The rotation of the feeding roller 33 drives the metal tube 3 to move axially.

[0045] In one instance of this embodiment, please refer to Figure 5 , Figure 8 , Figure 9 and Figure 10 Taking the left-side clamping rotation drive mechanism 4 as a directional reference, the clamping assembly 28 includes four fixed plates 47 disposed at the right end of the rotating sleeve 26. Each fixed plate 47 has a clamping rod 48 slidably connected to its end, and the clamping rod 48 is arranged radially along the rotating sleeve 26. A second mounting frame 49 is fixedly connected to one end of the clamping rod 48 near the center of the rotating sleeve 26, and a clamping roller 50 is rotatably connected within the second mounting frame 49. The axis of the clamping roller 50 is perpendicular to the axis of the rotating sleeve 26. The four clamping rollers 50 are distributed at equal angular intervals along the circumference of the rotating sleeve 26, and adjacent clamping rollers 50 are perpendicular to each other. Two pairs of opposing clamping rollers 50 are staggered in the axial direction of the rotating sleeve 26; that is, the two clamping rollers 50 on the left are arranged vertically opposite each other, and the two clamping rollers 50 on the right are arranged front-to-back opposite each other. Viewed from the end, the four clamping rollers 50 are located on the four sides of a rectangle. This arrangement avoids interference between adjacent clamping rollers 50 during clamping, ensuring that all four clamping rollers 50 can effectively abut against the outer wall of the metal tube 3. A clamping drive device 46 is provided on the outer side of the rotating sleeve 26. This device can simultaneously drive the four clamping rollers 50 to move synchronously towards the center of the rotating sleeve 26 to achieve clamping, or to move synchronously away from the center to release the metal tube 3.

[0046] The clamping drive device 46 includes a stop rod 41 located at the end of the clamping top rod 48 away from the center of the rotating sleeve 26. A return spring 42 is provided between the stop rod 41 and the fixed plate 47. The return spring 42 always applies a pushing force to the clamping top rod 48 away from the center of the rotating sleeve 26. A synchronization ring 39 is sleeved on the outer side of the rotating sleeve 26. An inclined top block 40 is provided on the inner ring of the synchronization ring 39. The four inclined top blocks 40 are in different axial positions and correspond to the four stop rods 41 respectively. When the synchronization ring 39 moves to the right, the inclined top block 40 pushes the stop rod 41 to move towards the center of the rotating sleeve 26, thereby causing the four clamping rollers 50 to clamp synchronously. When the synchronization ring 39 moves to the left, the inclined top block 40 disengages from the stop rod 41, and the stop rod 41 drives the clamping rollers 50 to move away from the center under the action of the return spring 42. An ejector cylinder 44 is provided on the inner wall of the rotating sleeve 26. The piston rod of the ejector cylinder 44 is fixedly connected to a support plate 43, and the support plate 43 is fixedly connected to a synchronizing ring 39. To improve driving stability, ejector cylinders 44 are symmetrically arranged on both sides of the inner wall of the rotating sleeve 26. At the same time, positioning rods 45, which are fixedly connected to the support plate 43, are also slidably connected to the inner wall of the rotating sleeve 26. The two positioning rods 45 and the two ejector cylinders 44 are alternately arranged and distributed circumferentially along the inner wall of the rotating sleeve 26.

[0047] The clamping rod 48 includes an adjusting rod 53 slidably connected to the fixed plate 47. An adjusting sleeve 51 is threadedly connected to the side of the adjusting rod 53 near the center of the rotating sleeve 26. An adjusting nut 52, which mates with the adjusting sleeve 51, is threadedly connected to the outer side of the adjusting rod 53. The end of the adjusting sleeve 51 near the center of the rotating sleeve 26 is fixedly connected to the second mounting frame 49. The total length of the clamping rod 48 can be changed by rotating the adjusting sleeve 51. When the cross-section of the metal tube 3 is a rectangle with unequal length and width, the two vertically opposite clamping rods 48 and the two front-to-back opposite clamping rods 48 can be adjusted to different lengths to ensure that the four clamping rollers 50 can simultaneously abut against the four surfaces of the metal tube 3 when moving synchronously. After the length adjustment is completed, the adjusting nut 52 can abut against the adjusting sleeve 51 to lock the length.

[0048] In one embodiment, please refer to the figure. Figure 6 and Figure 10Both the outer walls of the feeding roller 33 and the clamping roller 50 are provided with anti-slip knurling 34. The anti-slip knurling 34 on the outer wall of the feeding roller 33 is arranged axially and distributed around its central circumference, forming elongated strip-shaped knurling extending along the axial direction. When the feeding roller 33 rotates and drives the metal tube 3 to move axially, the anti-slip knurling 34 increases axial friction, improving feeding efficiency. When the metal tube 3 rotates with the rotating sleeve 26, the metal tube 3 slides relative to the anti-slip knurling 34 along its length, resulting in low friction and not affecting rotational movement. The anti-slip knurling 34 on the outer wall of the clamping roller 50 is arranged circumferentially and arrayed along its axial direction, forming annular knurling. When the metal tube 3 moves axially, its surface slides tangentially along the annular anti-slip knurling 34, resulting in low friction. When the clamping roller 50 rotates with the rotating sleeve 26 and drives the metal tube 3 to rotate, the side of the annular anti-slip knurling 34 contacts the surface of the metal tube 3, effectively transmitting torque. Through the above-mentioned anti-slip knurling 34 structural design, the feeding and rotation motion modes are independent of each other and do not interfere with each other.

[0049] In one instance of this embodiment, please refer to Figure 1 and Figure 11 The auxiliary support device 2 includes a third base plate 54 fixedly connected to the guide rail 1. A column 56 is provided in the middle of the third base plate 54. The upper end of the column 56 is rotatably connected to the middle of a horizontally oriented deflection arm 59. The deflection arm 59 extends obliquely upward to the right, and its right end is rotatably connected to a lifting roller 60 oriented perpendicular to the guide rail 1. The metal tube 3 is supported on the lifting roller 60. A slip ring 57 is slidably connected to the middle of the column 56. The lower end of a top rod 58 is rotatably connected to the left side of the slip ring 57, and the upper end of the top rod 58 is rotatably connected to the left end of the deflection arm 59. A tension spring 55 is provided between the slip ring 57 and the third base plate 54. The tension spring 55 applies a downward pulling force to the slip ring 57, so that the deflection arm 59 always maintains a counterclockwise rotation trend, thereby the lifting roller 60 always provides an upward support force to the metal tube 3. When the metal tube 3 rotates, the lifting roller 60 can adaptively float up and down with the undulation of the tube wall.

[0050] The working process of this device is as follows:

[0051] 1. Feeding steps

[0052] Adjust the distance between the two clamping rotary drive mechanisms 4 according to the length of the metal tube 3 to be processed, ensuring that the distance between the right clamping rotary drive mechanism 4 and the laser cutting mechanism 5 is less than the required length of the metal tube 3 after cutting, so as to ensure that the right tube segment can be effectively clamped after cutting. The metal tube 3 is conveyed by the feeding device to the left side of the guide rail 1 and placed on the auxiliary support device 2.

[0053] 2. Clamping steps

[0054] The ejector cylinder 44 is activated, driving the synchronizing ring 39 to move and causing the clamping rollers 50 in the two clamping rotary drive mechanisms 4 to separate from each other; simultaneously, the separation cylinder 35 is activated, causing the feeding rollers 33 on both sides to separate from each other. The metal tube 3 on the auxiliary support device 2 is pushed to the right until the right end of the metal tube 3 enters the interior of the right clamping rotary drive mechanism 4. The ejector cylinder 44 and the separation cylinder 35 are activated in reverse, causing the clamping rollers 50 and the feeding rollers 33 to move respectively, clamping and fixing the metal tube 3.

[0055] 3. Cutting steps

[0056] The feeding roller 33 is activated, driving the metal tube 3 to move axially, bringing the part to be cut directly below the laser cutting head 12. The lifting screw 15 is activated, driving the laser cutting head 12 downwards to the preset cutting position for laser cutting of the metal tube 3. Simultaneously, the rotary drive device 25 is activated, driving the rotary sleeve 26 to rotate the metal tube 3, allowing the laser cutting head 12 to cut the entire circumference of the metal tube 3. For processing curved trajectories, the feeding roller 33 can be synchronously controlled to move the metal tube 3 axially during rotation, achieving curved cutting. During the rotation of the rectangular cross-section metal tube 3, the distance between the laser cutting head 12 and the metal tube 3 will change slightly. Cutting quality is ensured by controlling the power and focal position of the laser cutting head 12.

[0057] 4. Polishing steps

[0058] After cutting, the laser cutting head 12 is raised, and the two sections of metal tube 3 are separated by the feeding rollers 33 on both sides. The grinding head 10 is raised and its drive motor is started, causing the grinding head 10 to rotate at high speed. The feeding rollers 33 are started in reverse, causing the two sections of metal tube 3 to move closer to each other, with the opposite ends of the two metal tubes 3 abutting against the outside of the grinding head 10, where the grinding head 10 grinds their ends. At the same time, the rotary drive device 25 is started again, causing the metal tube 3 to rotate, ensuring that the entire circumference of the end is evenly ground. If the end has an arc-shaped contour, the axial movement of the metal tube 3 needs to be controlled in conjunction with the feeding rollers 33 during the grinding process, so that its end always keeps in contact with the surface of the grinding head 10. Before the formal cutting, the right end of the metal tube 3 can also be pre-ground in the same way, so that both ends of the tube segment separated on the right side after cutting are ground. During the rotation of the rectangular metal tube 3, a slight vertical displacement will occur between the grinding head 10 and the end of the metal tube 3. Since the grinding head 10 is a columnar structure, a certain height area in the middle of the grinding head 10 can be ground without affecting the final grinding effect.

[0059] 5. Unloading process

[0060] After grinding, the grinding head 10 is lowered. The feeding roller 33 of the right-side clamping rotary drive mechanism 4 is activated, driving the cut metal tube 3 on the right side to move to the right. When the left end of the metal tube 3 contacts the feeding roller 33, the separation cylinder 35 is activated in reverse, causing the feeding roller 33 to separate. The metal tube 3 then slides to the right under gravity, completing the unloading. Subsequently, the feeding roller 33 on the left side continues to drive the metal tube 3 to move to the right, entering the next cycle of cutting.

[0061] This invention provides a laser cutting device for metal tubes. By setting a laser cutting mechanism 5 with a grinding head 10 between two clamping and rotating drive mechanisms 4, the metal tube 3 can be immediately deburred at the end by the grinding head 10 after laser cutting, eliminating the need for repeated clamping, effectively reducing process steps and improving production efficiency. The two clamping and rotating drive mechanisms 4 fix the two sides of the metal tube 3 respectively, preventing bending deformation of the free end due to lack of support when cutting long tubes, thus ensuring cutting accuracy. The overall device has a high degree of automation. After loading, the cutting and grinding processes can be automatically completed by the respective actuators without manual intervention, improving the continuity and stability of the processing.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the 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 the present invention.

Claims

1. A metal tube laser cutting device, comprising a guide rail, an auxiliary support device disposed on one side of the guide rail, and a metal tube placed on the auxiliary support device, characterized in that, It also includes a clamping rotation drive mechanism and a laser cutting mechanism; Two clamping rotary drive mechanisms are provided, one in the middle of the guide rail and the other on the side away from the auxiliary support device. The two clamping rotary drive mechanisms are used to drive the clamped metal tube to rotate and feed axially. The laser cutting mechanism is located on the side of the clamping and rotating drive mechanism located in the middle of the guide rail away from the center of the guide rail. It includes mounting seats that are respectively disposed on both sides of the metal tube and are height adjustable. On the opposite side of the two mounting seats, there are laser cutting heads for cutting the sidewalls of the metal tube and grinding heads for grinding the ends of the metal tube.

2. The metal tube laser cutting device according to claim 1, characterized in that, The laser cutting mechanism includes a first base plate fixedly connected to a guide rail, a vertical plate on the side of the first base plate, a lifting frame on the side of the vertical plate near the metal tube, a lifting drive assembly for driving the lifting frame to move up and down in the middle of the vertical plate, the lifting frame being a U-shaped structure with its opening facing the metal tube, the metal tube passing through the interior of the lifting frame, and the two ends of the lifting frame being connected to the mounting base.

3. The metal tube laser cutting device according to claim 2, characterized in that, A sliding rod is slidably connected to the end of the lifting frame. The end of the sliding rod near the metal tube is fixedly connected to the mounting base. A buffer spring is provided between the mounting base and the lifting frame. A positioning roller is rotatably connected to the end of the mounting base near the metal tube feed. When the positioning roller, which is located on the same mounting base as the laser cutting head, abuts against the side wall of the metal tube, the distance between the laser cutting head and the side wall of the metal tube is a preset cutting distance. When the positioning roller, which is located on the same mounting base as the grinding head, abuts against the side wall of the metal tube, the grinding position of the grinding head is flush with the end of the metal tube.

4. The metal tube laser cutting device according to claim 2, characterized in that, The lifting drive assembly includes a slide groove on the upright plate, a slider that is fixedly connected to the lifting frame is slidably connected in the slide groove, a lifting screw that is threadedly connected to the slider is rotatably connected to the side of the upright plate away from the metal tube, and a guide column that slides with the slider is fixedly connected to the side of the upright plate close to the metal tube.

5. The metal tube laser cutting device according to claim 1, characterized in that, The clamping rotary drive mechanism includes a second base plate fixedly connected to the guide rail, a support frame on the second base plate, a rotating sleeve rotatably connected to the side of the support frame away from the second base plate via a slewing bearing, a rotary drive device for driving the rotating sleeve to rotate in the middle of the support frame, the axis of the rotating sleeve coinciding with the center line of the metal tube, a feeding drive assembly for driving the axial feed of the metal tube on the side of the two rotating sleeves away from each other, and a clamping assembly for clamping the metal tube on the side of the two rotating sleeves close to each other.

6. The metal tube laser cutting device according to claim 5, characterized in that, The feeding drive assembly includes sliding sleeves symmetrically arranged on both sides of the inner wall of the rotating sleeve. The sliding sleeves are slidably connected to sliding rods. A first mounting frame is fixedly connected to one end of the sliding rod near the center of the rotating sleeve. A feeding roller is rotatably connected to the first mounting frame. The axis of the feeding roller is perpendicular to the axis of the rotating sleeve. A spring is provided inside the sliding sleeve to drive the sliding rod to move towards the center of the rotating sleeve. A separation device is provided on the inner wall of the rotating sleeve to drive the two first mounting frames to separate from each other.

7. A metal tube laser cutting device according to claim 6, characterized in that, The separation device includes a connecting rod rotatably connected to the end of the first mounting frame, and the ends of the two connecting rods away from the first mounting frame are respectively rotatably connected to the two ends of the push plate. The inner wall of the rotating sleeve is provided with a separation cylinder, and the piston rod of the separation cylinder is connected to an L-shaped support rod that cooperates with the push plate.

8. The metal tube laser cutting device according to claim 5, characterized in that, The clamping assembly includes four fixed plates disposed at the ends of the rotating sleeve. A clamping top rod is slidably connected to the end of the fixed plate. A second mounting frame is fixedly connected to one end of the clamping top rod near the center of the rotating sleeve. A clamping roller is rotatably connected to the second mounting frame. The axis of the clamping roller is perpendicular to the axis of the rotating sleeve. The four clamping rollers are distributed at equal angular intervals along the circumference of the rotating sleeve, and adjacent clamping rollers are perpendicular to each other. Two pairs of opposing clamping rollers are staggered from each other in the axial direction of the rotating sleeve. A clamping drive device is disposed on the outer side of the rotating sleeve to drive the clamping rollers to move towards the center of the rotating sleeve.

9. A metal tube laser cutting device according to claim 8, characterized in that, The clamping drive device includes a stop rod sleeved on the end of the clamping top rod away from the center of the rotating sleeve. A return spring is provided between the stop rod and the fixed plate to drive the clamping top rod to move away from the center of the rotating sleeve. A synchronizing ring is provided on the outer side of the rotating sleeve, and an inclined top block is provided on the inner side of the synchronizing ring. When the synchronizing ring moves axially, the inclined top block drives the stop rod to move closer to the center of the rotating sleeve. An ejector cylinder is provided on the inner wall of the rotating sleeve to drive the synchronizing ring to move axially. The clamping top rod includes an adjusting rod slidably connected to the fixed plate. An adjusting sleeve is threadedly connected to the side of the adjusting rod near the center of the rotating sleeve. An adjusting nut that cooperates with the adjusting sleeve is threadedly connected to the outer side of the adjusting rod. The second mounting frame is fixedly connected to the end of the adjusting sleeve near the center of the rotating sleeve.

10. A metal tube laser cutting apparatus according to claims 6 and 8, characterized in that, The outer walls of the feeding roller and the clamping roller are both provided with anti-slip knurling. The anti-slip knurling on the outer wall of the clamping roller is arranged along the circumference of the clamping roller and distributed in an array along its axial direction. The anti-slip knurling on the outer wall of the feeding roller is arranged along the axial direction of the feeding roller and distributed around its central circumference.

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