A laser pipe cutting machine and method of use thereof

Abstract

This invention relates to the field of laser cutting machine technology, specifically a laser tube cutting machine, comprising a base, a movable chuck, a fixed chuck, and a laser cutting head. It also includes a main rack, a connecting mechanism, a dumbbell seat, a positioning seat, a guide wheel assembly, a diagonal rod, a drive mechanism, and a grinding disc. The connecting mechanism is connected to the main rack, the dumbbell seat and the positioning seat are both connected to the connecting mechanism, the diagonal rod is hinged to the positioning seat, the drive mechanism is connected to the diagonal rod, and the grinding disc is connected to the drive mechanism. When the movable chuck moves the tube towards the fixed chuck, the main rack controls the operation of the connecting mechanism and drives the guide wheel assembly away from the dumbbell seat via the positioning seat. After the guide wheel assembly is in contact with the inner wall of the tube, the diagonal rod, under pressure, drives the grinding disc outward through the drive mechanism to grind the cut. During tube cutting, the positioning seat and the guide wheel assembly support the inner wall of the tube and simultaneously cool and grind the cut, improving the tube cutting effect.

Description

Technical Field

[0001] This invention relates to the field of laser cutting machine technology, specifically to a laser tube cutting machine and its usage method. Background Technology

[0002] A laser tube cutting machine is a CNC laser processing device specifically designed for high-precision and high-efficiency cutting of tubes (such as round tubes, square tubes, rectangular tubes, elliptical tubes, etc.). It uses a high-energy-density laser beam as a heat source, which, after focusing, locally melts or vaporizes the material on the surface of the tube. With the help of auxiliary gases (such as nitrogen, oxygen, or compressed air), the molten slag is blown away, achieving a continuous and controllable cutting path.

[0003] When using a laser tube cutter to cut thin plastic hoses, the thin plastic has a low melting point, and the laser energy can easily cause it to overheat, resulting in local softening or shrinkage. This can lead to bending, twisting, or changes in the diameter of the hose. As a result, after the plastic hose is cut, the shrinking and deformed ends need to be trimmed, which undoubtedly increases the workload of the operator.

[0004] To address the aforementioned problems, existing technologies offer a solution. For example, patent publication number CN120619610B discloses a laser tube cutting machine for processing plastic hoses, including a base. A control cabinet is fixedly connected to the right side wall of the base, and a mounting frame is fixedly connected to the upper side wall of the base. A first lead screw linear module is fixedly connected to the upper inner wall of the mounting frame, and a small electric push rod is fixedly connected to the moving end of the first lead screw linear module. When using a laser cutting machine to cut thin plastic hoses, this invention can support the plastic hose from the inside and automatically absorb the cut edge, preventing the cut edge from twisting and deforming due to excessive heat after laser cutting. This ensures the cutting quality of thin plastic hoses. Existing devices do not provide support to the inner wall of the plastic pipe during cutting, which easily leads to deformation of the plastic pipe due to high temperatures during cutting. Simultaneously, the high temperature at the cut edge of the plastic pipe makes it prone to unevenness, thus affecting the pipe's sealing performance.

[0005] Therefore, a laser tube cutting machine and its usage method are proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a laser tube cutting machine and its usage method, thereby solving the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A laser tube cutting machine includes a base, a movable chuck, a fixed chuck, and a laser cutting head. It also includes a main rack, a connecting mechanism, a dumbbell seat, a positioning seat, a guide wheel assembly, a diagonal rod, a drive mechanism, and a grinding disc. The main rack is fixedly connected to the movable chuck, the connecting mechanism is connected to the main rack, the dumbbell seat and the positioning seat are both connected to the connecting mechanism, the guide wheel assembly is rotatably connected to the positioning seat, the diagonal rod is hinged to the positioning seat, the drive mechanism is connected to the diagonal rod, and the grinding disc is connected to the drive mechanism. When the movable chuck moves the tube towards the fixed chuck, the main rack controls the connecting mechanism to operate and, through the positioning seat, drives the guide wheel assembly away from the dumbbell seat. After the guide wheel assembly is in contact with the inner wall of the tube, the diagonal rod, under pressure, drives the grinding disc outward through the drive mechanism to grind the cut.

[0008] Optionally, when laser cutting pipes, the inner wall of the pipe can be supported or not. If the inner wall of the pipe is not supported, the cut edge of the pipe may become soft due to high temperature, which may cause deformation at the cut edge and affect the cutting effect. Supporting the inner wall of the pipe can prevent the pipe from shrinking due to high temperature and ensure the cutting effect. Therefore, the method of supporting the inner wall of the pipe is used for cutting.

[0009] Preferably, the connecting mechanism includes a connecting gear, a secondary rack, a mounting base, a rotating rod, a connecting rod, a connecting disc, a fixed base, a push rod, and a connecting seat. The connecting gear meshes with the main rack, the secondary rack meshes with the connecting gear, the mounting base is fixedly connected to the fixed chuck, the rotating rod is rotatably mounted on one end of the mounting base, the connecting rod is slidably connected to the rotating rod, the secondary rack is fixedly connected to the connecting rod, the connecting disc is threadedly connected to the rotating rod, the fixed base is fixedly mounted on one end of the connecting disc, the push rod is hinged to the fixed base, the connecting seat is hinged to the push rod, and the positioning seat is fixedly connected to the connecting seat.

[0010] Preferably, the main rack and the secondary rack are centrally symmetrical about the axis of the connecting gear, and the length of the main rack and the secondary rack is half the length of the base. Both the main rack and the secondary rack include a toothed portion and a straight portion, with the toothed portion located near the end of the connecting gear.

[0011] Preferably, the rotating rod has a spirally arranged limiting groove, and the rotating rod is slidably connected to the connecting rod and the connecting plate respectively through positioning beads. The limiting groove cooperates with the positioning beads, and two sets of limiting grooves are symmetrically arranged around the axis of the rotating rod.

[0012] Preferably, the dumbbell holder includes a wide portion and a narrow portion, the wide portion is disposed at both ends of the narrow portion, the two wide portions are symmetrically arranged with respect to the center line of the narrow portion, and a connecting groove is provided inside the wide portion, and multiple connecting grooves are arranged circumferentially.

[0013] Optionally, when cutting pipes, the cut end can be left untreated or processed. If the cut end is left untreated, burrs from the cutting process may remain, affecting the neatness of the cut and potentially causing leaks when connecting two pipes. However, cold treatment and grinding of the cut end not only accelerates the cooling efficiency but also keeps the cut end smooth, improving the seal when connecting two pipes. Therefore, the method of treating the cut end after pipe cutting is adopted.

[0014] Preferably, the driving mechanism includes an air blowing unit, a guide rod, a spring, a disc, a hinge rod, a rectangular seat, a telescopic rod, and a base. The air blowing unit is connected to the positioning seat, the guide rod is slidably connected to the connecting seat, the spring is fixedly installed between the connecting seat and the positioning seat, the disc is hinged to the inclined rod, the hinge rod is hinged to the disc, the rectangular seat is hinged to the hinge rod, the telescopic rod is fixedly installed at one end of the rectangular seat, the base is fixedly installed at the piston rod end of the telescopic rod, and the frosted disc is fixedly connected to the base.

[0015] Preferably, the air blowing unit includes a transmission belt, a rotating shaft, and fan blades. The transmission belt is fitted with a guide wheel assembly, the rotating shaft is fixedly connected to a guide wheel assembly, and the fan blades are fixedly connected to the rotating shaft.

[0016] Preferably, when the guide wheel assembly is not in contact with the inner wall of the pipe, the diameter of the abrasive disc is smaller than the diameter of the guide wheel assembly; when the guide wheel assembly is in contact with the inner wall of the pipe, the diameter of the abrasive disc is larger than the diameter of the guide wheel assembly.

[0017] Preferably, air guides are provided on both sides of the grinding disc, and the center point of the air guides coincides with the axis of the rotating shaft.

[0018] A method of using a laser tube cutting machine includes the following steps: S1: When the moving chuck moves the pipe toward the fixed chuck, the dumbbell seat, the positioning seat, and the guide wheel assembly enter the pipe. As the secondary rack meshes with the connecting gear, the connecting rod moves horizontally. When the connecting rod moves, it drives the rotating rod to rotate through the main groove and the positioning ball. When the rotating rod rotates, it drives the two connecting discs to move toward each other through the secondary groove and the positioning ball. When the connecting discs move, they drive the fixed seat to move synchronously and push the connecting seat, the positioning seat, and the guide wheel assembly to move synchronously through the push rod, and control the guide wheel assembly to expand outward to fit against the inner wall of the pipe. S2: When the guide wheel assembly is in contact with the inner wall of the pipe, the continuous movement of the connecting disc generates pressure between the guide wheel assembly and the inner wall of the pipe. Under the action of pressure, the positioning seat is controlled to move towards the connecting seat, and at the same time, the spring is squeezed. When the positioning seat moves, it pushes the disc to move horizontally through the inclined rod. When the disc moves, it controls the hinge rod to close, thereby pushing the rectangular seat and the base to move synchronously. When the base is pushed, it drives the grinding disc to move synchronously. When the grinding disc is in contact with the pipe, the telescopic rod is in a compressed state. When the grinding disc coincides with the cut, the telescopic rod drives the grinding disc into the cut under its own elastic force. As the pipe rotates, the grinding disc rubs against the cut. S3: When the pipe rotates, it drives the guide wheel to rotate. When the guide wheel rotates, it drives the shaft to rotate through the transmission belt. When the shaft rotates, it drives the fan blade to rotate to generate air. The air blows into the air guide and then into the cut to cool the cut.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When cutting the pipe, control the dumbbell seat to enter the pipe. As the dumbbell seat goes deeper, the rotating rod rotates and squeezes the connecting plate, thereby controlling the two connecting plates to move towards each other. The push rod controls the positioning seat and guide wheel assembly to expand outward to achieve contact with the inner wall of the pipe, thereby supporting the inner wall of the pipe and ensuring that the pipe is cut in a stable state. At the same time, it avoids the pipe shrinking due to high temperature during cutting.

[0020] 2. When the pipe is being cut, it rotates. At the same time, the guide wheel rotates, which drives the fan blades to rotate and blow air onto the grinding disc. Under the action of the air guide, the air is directed to the cut of the plastic pipe, thereby cooling the cut and preventing deformation of the pipe cut due to high temperature, thus improving the cutting effect of the plastic pipe.

[0021] 3. When cutting plastic pipes, cutting and grinding are carried out sequentially. The grinding disc grinds the cooled cut to keep the pipe cut neat, avoid gaps between two pipes, and improve the sealing of the pipe connection. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the fixed chuck and connecting mechanism of the present invention; Figure 3 This is a three-dimensional structural diagram of the dumbbell holder of the present invention; Figure 4 This is a cross-sectional three-dimensional structural diagram of the dumbbell holder and connecting mechanism of the present invention; Figure 5 This is a three-dimensional cross-sectional structural diagram of the positioning seat of the present invention; Figure 6This is a schematic diagram of the main structure of the dumbbell holder and drive mechanism of the present invention.

[0023] In the diagram: 1. Base; 2. Moving chuck; 3. Fixed chuck; 4. Laser cutting head; 5. Main rack; 6. Connecting mechanism; 61. Connecting gear; 62. Secondary rack; 63. Mounting seat; 64. Rotating rod; 65. Connecting rod; 66. Connecting plate; 67. Fixed seat; 68. Push rod; 69. Connecting seat; 610. Limiting groove; 7. Dumbbell seat; 71. Wide section; 72. Narrow section; 73. Connecting groove; 8. Positioning seat; 9. Guide wheel assembly; 10. Diagonal rod; 11. Drive mechanism; 111. Air blowing unit; 1111. Transmission belt; 1112. Rotating shaft; 1113. Fan blade; 1114. Air guide section; 112. Guide rod; 113. Spring; 114. Disc; 115. Hinge rod; 116. Rectangular seat; 117. Telescopic rod; 118. Base; 12. Grinding disc. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. However, the embodiments described below are only some embodiments of the present invention, and not all of them. If other embodiments are obtained by those skilled in the art without creative effort, they shall fall within the protection scope of the present invention.

[0025] Reference Figures 1 to 6 A laser tube cutting machine includes a base 1, a movable chuck 2, a fixed chuck 3, and a laser cutting head 4. It also includes a main rack 5, a connecting mechanism 6, a dumbbell seat 7, a positioning seat 8, a guide wheel assembly 9, a diagonal rod 10, a drive mechanism 11, and a grinding disc 12. The main rack 5 is fixedly connected to the movable chuck 2. The connecting mechanism 6 is connected to the main rack 5. The dumbbell seat 7 and the positioning seat 8 are both connected to the connecting mechanism 6. The guide wheel assembly 9 is rotatably connected to the positioning seat 8. The diagonal rod 10 is hinged to the positioning seat 8. The drive mechanism 11 is connected to the diagonal rod 10. The grinding disc 12 is connected to... The drive mechanism 11 is connected, and the angle between the grinding disc 12 and the laser cutting head 4 is 45 degrees. With the above settings, sufficient time can be provided for the initial cooling of the pipe cut, and the cutting and grinding can be carried out sequentially. When the moving chuck 2 moves the pipe towards the fixed chuck 3, the main rack 5 controls the operation of the connecting mechanism 6 and drives the guide wheel group 9 away from the dumbbell seat 7 through the positioning seat 8. After the guide wheel group 9 is in contact with the inner wall of the pipe, the inclined rod 10 drives the grinding disc 12 to expand outward and enter the cutting gap to grind the cut under the action of pressure through the drive mechanism 11.

[0026] As one embodiment of the present invention, refer to Figures 2 to 4The connecting mechanism 6 includes a connecting gear 61, a secondary rack 62, a mounting base 63, a rotating rod 64, a connecting rod 65, a connecting plate 66, a fixed base 67, a push rod 68, and a connecting seat 69. The connecting gear 61 meshes with the main rack 5, the secondary rack 62 meshes with the connecting gear 61, the mounting base 63 is fixedly connected to the fixed chuck 3, the rotating rod 64 is rotatably mounted on one end of the mounting base 63, the connecting rod 65 is slidably connected to the rotating rod 64, the secondary rack 62 is fixedly connected to the connecting rod 65, the connecting plate 66 is threadedly connected to the rotating rod 64, the fixed base 67 is fixedly mounted on one end of the connecting plate 66, the push rod 68 is hinged to the fixed base 67, the connecting seat 69 is hinged to the push rod 68, and the positioning base 8... The connecting seat 69 is fixedly connected. The main rack 5 and the secondary rack 62 are centrally symmetrical about the axis of the connecting gear 61. The length of the main rack 5 and the secondary rack 62 is half the length of the base 1. With the above arrangement, the pipe can be cut to its maximum length. When the pipe is being cut, if the cutting length is greater than half the length of the pipe, only a small distance needs to be controlled to move the pipe to cut off the excess part. Both the main rack 5 and the secondary rack 62 include teeth and straight parts. The teeth are located at the end near the connecting gear 61. With the above arrangement, the meshing distance between the connecting gear 61 and the main rack 5 and the secondary rack 62 can be limited, and the meshing distance can be controlled. During the process, the connecting seat 69 and the guide wheel group 9 are expanded outward to achieve a fit with the inner wall of the pipe. The rotating rod 64 is provided with a spirally arranged limiting groove 610. The rotating rod 64 is slidably connected to the connecting plate 66, the connecting rod 65, and the connecting plate 66 through positioning beads. The limiting groove 610 cooperates with the positioning beads. Two sets of limiting grooves 610 are symmetrically arranged around the axis of the rotating rod 64. Through the above arrangement, when the secondary rack 62 meshes with the connecting gear 61, it can drive the connecting rod 65 to move synchronously. Due to the special arrangement of the limiting groove 610 and the positioning beads, the rotating rod 64 can be squeezed, thereby controlling the rotating rod 64 to rotate, and thus controlling the two connecting plates 66 to face each other. The dumbbell seat 7 has symmetrically arranged limiting grooves 610 inside. This arrangement allows the two connecting plates 66 to move towards each other when the rotating rod 64 rotates. The dumbbell seat 7 includes a wide part 71 and a narrow part 72. The wide part 71 is located at both ends of the narrow part 72. The two wide parts 71 are symmetrically arranged with respect to the center line of the narrow part 72. The wide part 71 has multiple connecting grooves 73 arranged circumferentially. The connecting grooves 73 provide space for the movement of the connecting seat 69 and limit the movement of the connecting seat 69, so that the connecting seat 69 can only move within the connecting grooves 73, thus preventing the connecting seat 69 from tilting during movement.

[0027] As one embodiment of the present invention, refer to Figure 5 and Figure 6The drive mechanism 11 includes an air blowing unit 111, a guide rod 112, a spring 113, a disc 114, a hinge rod 115, a rectangular seat 116, a telescopic rod 117, and a base 118. The air blowing unit 111 is connected to the positioning seat 8. The guide rod 112 is slidably connected to the connecting seat 69. The spring 113 is fixedly installed between the connecting seat 69 and the positioning seat 8. The disc 114 is hinged to the inclined rod 10. The hinge rod 115 is hinged to the disc 114. The rectangular seat 116 is hinged to the hinge rod 115. The telescopic rod 117 is fixedly installed at one end of the rectangular seat 116. The base 118 is fixedly installed at the piston rod end of the telescopic rod 117. The telescopic rod 117... The abrasive disc 12 can maintain a squeezing state before entering the pipe cut, and can release after entering the cut. This allows the diameter of the abrasive disc 12 to be greater than the diameter of the guide wheel assembly 9 while maintaining coaxiality. At this time, the difference between the diameters of the abrasive disc 12 and the guide wheel assembly 9 is greater than the thickness of most pipes on the market. With this setting, the abrasive disc 12 can completely rub the pipe cut, thus ensuring the flatness of the entire pipe cut. The abrasive disc 12 is fixedly connected to the base 118, and the thickness of the abrasive disc 12 gradually decreases from the center to the edge. With the above settings, the abrasive disc 12 can easily enter the pipe cut smoothly.

[0028] As one embodiment of the present invention, refer to Figure 5 The air blowing unit 111 includes a transmission belt 1111, a rotating shaft 1112, and a fan blade 1113. The transmission belt 1111 is fitted with a guide wheel assembly 9. The rotating shaft 1112 is fixedly connected to a guide wheel assembly 9. The fan blade 1113 is fixedly connected to the rotating shaft 1112. When the guide wheel assembly 9 is not fitted with the inner wall of the pipe, the diameter of the abrasive disc 12 is smaller than the diameter of the guide wheel assembly 9. When the guide wheel assembly 9 is fitted with the inner wall of the pipe, the diameter of the abrasive disc 12 is larger than the diameter of the guide wheel assembly 9. Air guides 1114 are provided on both sides of the abrasive disc 12. The center point of the air guide 1114 coincides with the axis of the rotating shaft 1112. Through the above arrangement, the air generated by the rotation of the fan blade 1113 can be guided to the cut of the pipe, thereby achieving cooling of the cut of the pipe.

[0029] A stamping method for a laser tube cutting machine includes the following steps: S1: When the moving chuck 2 moves the pipe toward the fixed chuck 3, the dumbbell seat 7, the positioning seat 8, and the guide wheel assembly 9 enter the pipe. As the secondary rack 62 meshes with the connecting gear 61, the connecting rod 65 moves horizontally. When the connecting rod 65 moves, it drives the rotating rod 64 to rotate through the main groove and the positioning ball. When the rotating rod 64 rotates, it drives the two connecting discs 66 to move toward each other through the secondary groove and the positioning ball. When the connecting discs 66 move, they drive the fixed seat 67 to move synchronously and push the connecting seat 69, the positioning seat 8, and the guide wheel assembly 9 to move synchronously through the push rod 68, thereby controlling the guide wheel assembly 9 to expand outward to fit against the inner wall of the pipe. S2: When the guide wheel assembly 9 is in contact with the inner wall of the pipe, pressure is generated between the guide wheel assembly 9 and the inner wall of the pipe as the connecting disc 66 continues to move. Under the action of pressure, the positioning seat 8 is controlled to move towards the connecting seat 69, while the spring 113 is squeezed. When the positioning seat 8 moves, the disc 114 is pushed to move horizontally through the inclined rod 10. When the disc 114 moves, the hinge rod 115 is controlled to close, thereby pushing the rectangular seat 116 and the base 118 to move synchronously. When the base 118 is pushed, it drives the abrasive disc 12 to move synchronously. When the abrasive disc 12 is in contact with the pipe, the telescopic rod 117 is in a compressed state. When the abrasive disc 12 coincides with the cut, the telescopic rod 117 drives the abrasive disc 12 into the cut under the action of its own elasticity. As the pipe rotates, the abrasive disc 12 rubs the cut. S3: When the pipe rotates, it drives the guide wheel to rotate. When the guide wheel rotates, it drives the rotating shaft 1112 to rotate through the transmission belt 1111. When the rotating shaft 1112 rotates, it drives the fan blade 1113 to rotate to generate wind. The wind blows to the air guide 1114 and then blows to the cut to cool the cut.

[0030] Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, those skilled in the art can make changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of the present invention. The appended claims and their equivalents define the scope of the present invention.

Claims

1. A laser tube cutting machine, comprising a base (1), a moving chuck (2), a fixed chuck (3), and a laser cutting head (4), characterized in that: It also includes a main rack (5), a connecting mechanism (6), a dumbbell seat (7), a positioning seat (8), a guide wheel assembly (9), a slant bar (10), a drive mechanism (11), and a grinding disc (12). The main rack (5) is fixedly connected to the movable chuck (2). The connecting mechanism (6) is connected to the main rack (5). The dumbbell seat (7) and the positioning seat (8) are both connected to the connecting mechanism (6). The guide wheel assembly (9) is rotatably connected to the positioning seat (8). The slant bar (10) is hinged to the positioning seat (8). The drive mechanism (11) is connected to the inclined rod (10), and the grinding disc (12) is connected to the drive mechanism (11). When the moving chuck (2) drives the pipe to move towards the fixed chuck (3), the main rack (5) controls the connection mechanism (6) to run and drives the guide wheel group (9) away from the dumbbell seat (7) through the positioning seat (8). After the guide wheel group (9) is in contact with the inner wall of the pipe, the inclined rod (10) drives the grinding disc (12) to expand outward into the cutting gap to grind the cut under the action of pressure through the drive mechanism (11).

2. The laser tube cutting machine according to claim 1, characterized in that: The connecting mechanism (6) includes a connecting gear (61), a secondary rack (62), a mounting base (63), a rotating rod (64), a connecting rod (65), a connecting plate (66), a fixed base (67), a push rod (68), and a connecting base (69). The connecting gear (61) meshes with the main rack (5), the secondary rack (62) meshes with the connecting gear (61), the mounting base (63) is fixedly connected to the fixed chuck (3), and the rotating rod (64) is rotatably mounted. At one end of the mounting base (63), the connecting rod (65) is slidably connected to the rotating rod (64), the secondary rack (62) is fixedly connected to the connecting rod (65), the connecting plate (66) is threadedly connected to the rotating rod (64), the fixed base (67) is fixedly installed at one end of the connecting plate (66), the push rod (68) is hinged to the fixed base (67), the connecting base (69) is hinged to the push rod (68), and the positioning base (8) is fixedly connected to the connecting base (69).

3. A laser tube cutting machine according to claim 2, characterized in that: The main rack (5) and the secondary rack (62) are centrally symmetrical about the axis of the connecting gear (61). The length of the main rack (5) and the secondary rack (62) is half the length of the base (1). Both the main rack (5) and the secondary rack (62) include a toothed portion and a straight portion. The toothed portion is located at one end near the connecting gear (61).

4. A laser tube cutting machine according to claim 3, characterized in that: The rotating rod (64) is provided with a spirally arranged limiting groove (610). The rotating rod (64) is slidably connected to the connecting rod (65) and the connecting plate (66) respectively through positioning beads. The limiting groove (610) cooperates with the positioning beads. Two sets of limiting grooves (610) are symmetrically arranged around the axis of the rotating rod (64).

5. A laser tube cutting machine according to claim 1, characterized in that: The dumbbell holder (7) includes a wide part (71) and a narrow part (72). The wide part (71) is located at both ends of the narrow part (72). The two wide parts (71) are symmetrically arranged with respect to the center line of the narrow part (72). A connecting groove (73) is provided inside the wide part (71). Multiple connecting grooves (73) are arranged circumferentially.

6. A laser tube cutting machine according to claim 1, characterized in that: The drive mechanism (11) includes an air blowing unit (111), a guide rod (112), a spring (113), a disc (114), a hinge rod (115), a rectangular seat (116), a telescopic rod (117), and a base (118). The air blowing unit (111) is connected to the positioning seat (8), the guide rod (112) is slidably connected to the connecting seat (69), and the spring (113) is fixedly installed on the connecting seat (69). Between the positioning seat (8), the disc (114) is hinged to the inclined rod (10), the hinge rod (115) is hinged to the disc (114), the rectangular seat (116) is hinged to the hinge rod (115), the telescopic rod (117) is fixedly installed at one end of the rectangular seat (116), the base (118) is fixedly installed at the piston rod end of the telescopic rod (117), and the frosting disc (12) is fixedly connected to the base (118).

7. A laser tube cutting machine according to claim 6, characterized in that: The air blowing unit (111) includes a transmission belt (1111), a rotating shaft (1112), and a fan blade (1113). The transmission belt (1111) is fitted with a guide wheel assembly (9). The rotating shaft (1112) is fixedly connected to a guide wheel assembly (9). The fan blade (1113) is fixedly connected to the rotating shaft (1112).

8. A laser tube cutting machine according to claim 7, characterized in that: When the guide wheel assembly (9) is not in contact with the inner wall of the pipe, the diameter of the abrasive disc (12) is smaller than the diameter of the guide wheel assembly (9). When the guide wheel assembly (9) is in contact with the inner wall of the pipe, the diameter of the abrasive disc (12) is larger than the diameter of the guide wheel assembly (9).

9. A laser tube cutting machine according to claim 8, characterized in that: The grinding disc (12) is provided with air guides (1114) on both sides, and the center point of the air guides (1114) coincides with the axis of the rotating shaft (1112).

10. A method of using a laser tube cutting machine according to any one of claims 1-9, characterized in that, Includes the following steps: S1: When the moving chuck (2) drives the pipe to move towards the fixed chuck (3), the dumbbell seat (7), the positioning seat (8) and the guide wheel group (9) enter the pipe. As the secondary rack (62) meshes with the connecting gear (61), the control link (65) moves horizontally. When the link (65) moves, it drives the rotating rod (64) to rotate through the main groove (641) and the positioning ball. When the rotating rod (64) rotates, it drives the two connecting discs (66) to move towards each other through the secondary groove (642) and the positioning ball. When the connecting discs (66) move, they drive the fixed seat (67) to move synchronously and push the connecting seat (69), the positioning seat (8) and the guide wheel group (9) to move synchronously through the push rod (68), and control the guide wheel group (9) to expand outward to fit against the inner wall of the pipe. S2: When the guide wheel assembly (9) is in contact with the inner wall of the pipe, the guide wheel assembly (9) generates pressure with the inner wall of the pipe as the connecting disc (66) continues to move. Under the action of pressure, the positioning seat (8) is controlled to move towards the connecting seat (69), and the spring (113) is squeezed at the same time. When the positioning seat (8) moves, the disc (114) is pushed to move horizontally through the inclined rod (10). When the disc (114) moves, the hinge rod (115) is controlled to close, thereby pushing the rectangular seat (116) and the base (118) to move synchronously. When the base (118) is pushed, it drives the sanding disc (12) to move synchronously. When the sanding disc (12) is in contact with the pipe, the telescopic rod (117) is in a compressed state. When the sanding disc (12) coincides with the cut, the telescopic rod (117) drives the sanding disc (12) into the cut under its own elastic force. As the pipe rotates, the sanding disc (12) rubs against the cut. S3: When the pipe rotates, it drives the guide wheel to rotate. When the guide wheel rotates, it drives the rotating shaft (1112) to rotate through the transmission belt (1111). When the rotating shaft (1112) rotates, it drives the fan blade (1113) to rotate to generate wind. The wind blows to the air guide (1114) and through the air guide (1114) blows to the cut to cool the cut.

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