A three-dimensional laser cutting machine and laser cutting method for a scooter tube

Abstract

This invention discloses a three-dimensional laser cutting machine and method for scooter tubing, specifically relating to the field of tubing laser cutting. The cutting machine includes a main body, on which a cutting unit, a moving unit, a clamping part, a flow guiding part, a support part, and a control unit are provided. The clamping part includes a first clamping assembly and a second clamping assembly for controlling the axial movement of the tubing; the flow guiding part includes a connecting box and a flow guiding assembly, the connecting box being able to deliver inert gas into the tubing; the support part includes a support block and multiple support plates, the support plates being able to internally support the tubing wall through gas driving within the tubing. During cutting, the control unit controls the support part to extend into the tubing, and inert gas is introduced to drive the support plates to expand and support the tubing wall, preventing the cut section from sagging or bending due to suspension; when cutting mounting holes, the flow guiding plate is used to direct airflow to the cutting point for cooling and to blow away debris, preventing debris from entering the tubing and forming wall adhesion, effectively ensuring processing quality.

Description

Technical Field

[0001] This invention relates to the field of laser cutting of pipes, and more specifically, to a three-dimensional laser cutting machine and laser cutting method for scooter pipes. Background Technology

[0002] As a core structural component of scooters, the manufacturing precision of the tubing directly affects the folding reliability, assembly accuracy, and riding safety of the entire scooter. With the trend towards lightweight and foldable portability in scooters, the tubing often adopts a thin-walled, irregularly shaped bent structure, requiring the machining of various functional features such as folding mechanism mounting holes, intersecting port lines, and weight-reduction holes. Three-dimensional laser cutting technology, due to its high precision, high flexibility, and moldless operation, has become the mainstream process for scooter tubing manufacturing. During the cutting process, the tubing is typically positioned and driven by clamping at one or both ends, while the laser cutting head completes the machining of various features along a programmed path.

[0003] In existing technologies, when cutting metal pipes, the section to be cut is suspended in mid-air, lacking effective internal or external support. As the cutting depth increases, the connection area between the cut pipe and the main pipe gradually decreases. When the strength of the connection is insufficient to support the weight of the cut section, the pipe section will sag, bend, or even break prematurely under gravity. This results in an uneven cut end face, chipping, or step defects, leading to a decrease in the quality of the cut surface and affecting subsequent assembly. Furthermore, when cutting local features such as folding device mounting holes, high-temperature metal debris and slag generated during cutting can easily enter the inner wall of the pipe through the cut. These high-temperature debris will fuse or adhere to the inner wall of the pipe upon contact, and after cooling, they will firmly adhere to the inner surface of the pipe cavity. Not only are they difficult to remove, but they will also affect the passage and assembly of internal conduits during subsequent use, posing a serious hidden danger to the electrical wiring of electric scooters. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a three-dimensional laser cutting machine and laser cutting method for scooter tubing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a three-dimensional laser cutting machine for scooter tubing, comprising a main body, wherein the main body is provided with a cutting unit and a moving unit, and further comprising: Clamping part: It includes a first clamping assembly and a second clamping assembly capable of controlling the axial movement of the pipe; The flow guiding section includes a connecting box and a flow guiding assembly. The connecting box can deliver gas into the pipe through a connecting pipe, and the flow guiding assembly can guide the gas in the pipe. Support section: It includes a support block, on which multiple support plates are provided, and the support plates can support the inner wall of the pipe by being driven by gas inside the pipe; Control Unit: The control unit is electrically connected to the moving unit, the cutting unit, and the clamping part respectively; when cutting the folding device mounting hole, the control unit controls the second clamping assembly to introduce inert gas into the pipe and uses the flow guiding assembly to guide the airflow to the cutting point; when cutting the pipe, the control unit controls the second clamping assembly to drive the pipe to move axially, so that the support part extends into the pipe, and after the pipe end cooperates with the flow guiding assembly, the control unit controls the introduction of inert gas to drive the support plate to expand and support the pipe wall, maintain positive pressure inside the pipe to prevent debris from being sucked back.

[0006] Preferably, the moving unit includes a first driving part for controlling the movement of the cutting unit and a second driving part for controlling the movement of the clamping part, the second driving part including a moving plate.

[0007] Preferably, the first clamping assembly is rotatably connected to the moving plate, the second clamping assembly includes an adjusting block, the adjusting block is slidably connected to the moving plate, the moving plate is provided with a drive motor, the output end of the drive motor is coaxially fixedly connected to a reciprocating screw rotatably connected to the moving plate, and the adjusting block is threadedly connected to the reciprocating screw.

[0008] Preferably, the support block has a sliding cavity, a frustum is slidably connected in the sliding cavity, and the support block has an air inlet with an opening facing the clamping part and communicating with the sliding cavity. The area of ​​the frustum near the air inlet is larger than the area of ​​the end away from the air inlet.

[0009] Preferably, the circular platform is provided with a plurality of T-shaped limiting grooves, and a support rod is slidably connected in the limiting groove. The support rod is slidably connected to the side wall of the support block, and the free end of the support rod passes through the side wall of the support block and is provided with an arc-shaped support plate.

[0010] Preferably, the end of the truncated cone away from the air inlet is connected to the side wall of the sliding cavity via an elastic element, and the side wall of the support block near the air inlet is provided with multiple exhaust grooves, one end of which is connected to the sliding cavity and the other end is connected to the outside.

[0011] Preferably, the flow guiding assembly includes a support shaft fixedly connected to the movable plate. The support shaft is coaxially arranged with the first clamping assembly and the second clamping assembly. A sealing plate is coaxially arranged on the support shaft, and a sealing strip that can cooperate with the end of the pipe is provided on the sealing plate.

[0012] Preferably, the connecting box has a connecting hole communicating with the second clamping assembly, and the connecting box and the adjusting block are provided with a displacement sensor on the support block. The displacement sensor is used to detect the distance between the pipe port and the support block.

[0013] Preferably, the support block is provided with a guide plate, the guide plate is fixedly connected to the support plate located on the upper side, the guide plate is provided with a guide groove, the upper end of the guide groove is connected to the outside, and the lower end of the guide groove can be connected to the exhaust groove at the upper end.

[0014] A laser cutting method for scooter tubing includes the following steps: S1: The pipe is centripetally clamped and positioned by the first clamping component and the second clamping component; the control unit drives the second driving part to move the pipe forward axially, and the displacement sensor completes the automatic edge finding of the pipe end face.

[0015] S2: The control unit drives the cutting unit to move to the position of the pipe to be processed and performs the cutting of the folder mounting hole; during the cutting process, the control unit opens the connecting box of the guide section and fills the pipe with inert gas through the inner hole of the second clamping component; under the guidance of the preset guide plate, the airflow is accurately blown towards the cutting area of ​​the mounting hole for cooling and blown out from the inside of the pipe to prevent cutting debris from sticking to the wall; after the mounting hole is cut, the inert gas is stopped.

[0016] S3: The control unit drives the moving unit and the second clamping assembly to align the focus of the cutting unit with the cutting position of the pipe; the support block extends into the pipe, and the pipe end and the sealing plate form an end face seal fit; the connection box is reopened and inert gas is introduced, and the air pressure drives the frustum in the sliding cavity to retract, and the inclined plane causes the support rod and support plate to open outward, providing flexible support to the pipe wall from the inside and eliminating the suspended state of the pipe cutting section.

[0017] S4: Positive pressure cutting and debris discharge. The control unit maintains the internal air pressure of the pipe and drives the cutting unit to perform the pipe cutting operation. At the moment the pipe is cut through, the internal high-pressure inert gas is sprayed outward from the newly cut to form a positive pressure barrier, preventing metal debris and slag from entering the pipe. At the same time, the support plate maintains the support state until the pipe is completely separated, preventing the cut section from bending or chipping due to gravity.

[0018] S5: After the pipe is cut and released, the control unit stops the supply of inert gas, the internal pressure of the sliding cavity is released, the truncated cone is reset under the action of the elastic element, and the support plate is driven to retract inward and separate from the pipe wall; then the clamping part is retracted, the cut pipe is released and taken out.

[0019] The technical effects and advantages of this invention are as follows: 1. This invention effectively solves the problem of sagging, bending, or premature breakage of the pipe section to be cut due to its suspended state under gravity by setting a pneumatic internal support system composed of a frustum, support rod, support plate, and elastic element inside the support block. It avoids chipping or step defects on the cut end face, significantly improves the flatness and processing quality of the cut surface. At the same time, at the moment of cutting, the positive pressure inert gas maintained inside the pipe is ejected outward from the new cut, forming a positive pressure barrier, which can prevent metal chips and slag generated during cutting from being sucked into the pipe through the cut, reducing the risk of chips sticking to the inner wall of the pipe cavity.

[0020] 2. This invention, by setting guide plates and guide grooves on the support block, precisely guides part of the inert gas introduced into the pipe to the cutting area of ​​the installation hole through the exhaust groove and guide groove, thereby achieving forced convection cooling of the cutting point. This helps to prevent the thin-walled pipe from deforming the hole or having an excessively large heat-affected zone due to excessive local heat input. In the subsequent cutting process, when the support part extends into the pipe and the support plate is opened by the gas, the arc surface formed by multiple support plates can cover and seal the inside of the cut installation hole area. Combined with the sealing plate and sealing strip to seal the end face of the pipe port, the gas introduced into the pipe will be reversed after encountering the blockage and discharged directionally from the cutting cut, further enhancing the reliability of positive pressure slag discharge. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the clamping part and the guide part in this invention.

[0023] Figure 3 This is a schematic diagram of the flow guide, support, and clamping parts in this invention.

[0024] Figure 4 This is a schematic diagram of the internal structure of the support portion in this invention.

[0025] Figure 5 This is a schematic diagram of the structure of the frustum, support rod, and support plate in this invention.

[0026] Figure 6 This is a schematic diagram of the structure of the connecting box and the second clamping assembly in this invention.

[0027] In the picture: 1. Main body; 11. Cutting unit; 12. Moving unit; 121. First driving unit; 122. Second driving unit; 1221. Moving plate; 2. Clamping part; 21. First clamping assembly; 22. Second clamping assembly; 221. Adjusting block; 222. Drive motor; 223. Reciprocating lead screw; 3. Flow guide section; 31. Connecting box; 32. Flow guide assembly; 321. Support shaft; 322. Sealing plate; 323. Sealing strip; 324. Flow guide plate; 325. Flow guide groove; 33. Connecting pipe; 34. Connecting hole; 35. Displacement sensor; 4. Support section; 41. Support block; 42. Support plate; 43. Sliding cavity; 44. Frustum; 45. Air inlet; 46. Limiting groove; 47. Support rod; 48. Elastic element; 49. Exhaust groove; 5. Control unit. Detailed Implementation

[0028] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1 When cutting metal pipes, the section of pipe to be cut is suspended in mid-air, lacking effective internal or external support. As the cutting depth increases, the connection area between the cut pipe and the main pipe gradually decreases. When the strength of the connection is insufficient to support the weight of the cut section, the pipe section will sag, bend, or even break prematurely under the influence of gravity. This results in an uneven cut end face, chipping, or step defects, reducing the processing quality of the cut surface and affecting subsequent assembly.

[0030] To resolve the above technical issues, please refer to Figures 1 to 6 As shown, the first embodiment of the present invention provides a three-dimensional laser cutting machine for scooter tubing, including a main body 1, on which a cutting unit 11 and a moving unit 12 are provided, and further includes: Clamping part 2: It includes a first clamping assembly 21 and a second clamping assembly 22 capable of controlling the axial movement of the pipe; The flow guide 3 includes a connecting box 31 and a flow guide assembly 32. The connecting box 31 can deliver gas into the pipe through the connecting pipe 33, wherein the connecting pipe 33 can be connected to the gas storage unit, and the control unit 5 can control the gas storage unit to deliver inert gas. Support part 4: It includes a support block 41, and a plurality of support plates 42 are provided on the support block 41. The support plates 42 can support the inner wall of the pipe by being driven by the gas inside the pipe. Control Unit 5: Control Unit 5 is electrically connected to Moving Unit 12, Cutting Unit 11 and Clamping Part 2 respectively; when cutting the pipe, it controls the second clamping assembly 22 to drive the pipe to move axially, so that the support part 4 extends into the pipe, and after the pipe end cooperates with the flow guiding assembly 32, it controls the introduction of inert gas to drive the support plate 42 to expand the support pipe wall.

[0031] The moving unit 12 includes a first driving part 121 for controlling the movement of the cutting unit 11 and a second driving part 122 for controlling the movement of the clamping part 2. The second driving part 122 includes a moving plate 1221.

[0032] The first clamping assembly 21 is rotatably connected to the moving plate 1221. The second clamping assembly 22 includes an adjusting block 221, which is slidably connected to the moving plate 1221. The moving plate 1221 is equipped with a drive motor 222. The output end of the drive motor 222 is coaxially fixedly connected to a reciprocating screw 223, which is rotatably connected to the moving plate 1221. The adjusting block 221 is threadedly connected to the reciprocating screw 223. The first clamping assembly 21 provides precise circumferential rotational motion during the cutting process, ensuring that the laser can complete the processing of spatial curves such as intersection lines and locking grooves. At the same time, through its centripetal clamping mechanism, it provides the main radial positioning reference for the pipe, resists the thermal stress and auxiliary gas impact force during the cutting process, and prevents the pipe from slipping circumferentially or moving radially. The specific structure of the first clamping assembly 21 is existing technology and will not be described in detail. The second clamping assembly 22 can be fixed to the end of the pipe and drive the pipe to move axially. The clamping structure and clamping method of the second clamping assembly 22 are also existing technology and will not be described in detail.

[0033] A sliding cavity 43 is provided inside the support block 41, and a frustum 44 is slidably connected inside the sliding cavity 43. An air inlet 45 is provided on the support block 41, with its opening facing the clamping part 2 and communicating with the sliding cavity 43. The area of ​​the end of the frustum 44 near the air inlet 45 is larger than the area of ​​its end away from the air inlet 45. The shape of the frustum 44 is as follows: Figure 4 As shown.

[0034] The frustum 44 has multiple T-shaped limiting grooves 46, and a support rod 47 is slidably connected in the limiting groove 46. The support rod 47 is slidably connected to the side wall of the support block 41. The free end of the support rod 47 passes through the side wall of the support block 41 and is provided with an arc-shaped support plate 42. The limiting grooves 46 are opened on the inclined surface of the frustum 44. When the frustum 44 undergoes axial displacement, the inclined surface movement of the frustum 44 is converted into a precise linear movement of the support rod 47 radially outward along the pipe because the support rod 47 is radially guided and constrained by the side wall of the support block 41.

[0035] The end of the frustum 44 furthest from the air inlet 45 is connected to the side wall of the sliding cavity 43 via an elastic element 48. Multiple exhaust grooves 49 are provided on the side wall of the support block 41 near the air inlet 45. One end of each exhaust groove 49 communicates with the sliding cavity 43, and the other end communicates with the outside. After the pipe end is sealed with the sealing plate 322, the inert gas introduced through the inner hole of the second clamping assembly 22 flows through the inside of the pipe and first enters the sliding cavity 43 from the air inlet 45. Since the air inlet 45 is aligned with the larger end face of the frustum 44, the high-pressure gas here... An effective thrust area is formed, which pushes the frustum 44 to move backward against the resistance of the elastic element 48, providing initial power for the outward expansion of the support plate 42. During the cutting process, the continuously introduced gas continuously replenishes the pressure in the sliding cavity 43 through the air inlet 45, ensuring that the frustum 44 is always in the retracted position, so that the support plate 42 maintains a constant supporting force on the pipe wall, preventing the thin-walled pipe from deforming at the moment of cutting. The exhaust groove 49 provides a controlled leakage channel, so that the air intake and exhaust reach a dynamic balance and maintain a preset stable supporting air pressure.

[0036] The connecting box 31 has a connecting hole 34 that communicates with the second clamping assembly 22. The connecting box 31 is fixedly connected to the adjusting block 221. The support block 41 is provided with a displacement sensor 35. The displacement sensor 35 is located on the front end face of the support block 41 and emits a detection beam toward the pipe port. The displacement sensor 35 is used to detect the distance between the pipe port and the support block 41. Both the first clamping assembly 21 and the second clamping assembly 22 are annular and clamp the pipe in a centripetal clamping manner. When the second clamping assembly clamps the end of the pipe, the connecting hole 34 on the connecting box 31 communicates with the pipe, and the connecting pipe 33 can supply air to the inside of the pipe. The displacement sensor 35 can detect the distance between the support part 4 and the pipe port in real time. The control unit 5 drives the moving unit 12 and the second clamping assembly 22 to move according to this distance to perform the cutting of the folder mounting hole or the cutting of the pipe.

[0037] At the start of processing, the control unit 5 coordinates the process. The first clamping assembly 21 and the second clamping assembly 22 respectively perform centripetal clamping and positioning of the tube. The first clamping assembly 21 provides clamping for the main rotating shaft; the second clamping assembly 22 clamps the end of the tube. At this time, the connecting hole 34 on the connecting box 31, which is fixedly connected to the adjusting block 221, communicates with the inside of the tube.

[0038] After clamping is completed, the control unit 5 drives the second drive unit 122 of the moving unit 12 to start working. The drive motor 222 runs, which drives the adjusting block 221 to slide axially along the moving plate 1221 through the reciprocating screw 223, and then drives the pipe to move forward axially through the second clamping assembly 22. During this movement, the displacement sensor 35 installed on the support block 41 detects the distance between the pipe end and the support block 41 in real time and feeds the data back to the control unit 5. The control unit 5 determines whether the pipe has reached the preset axial position and completes automatic edge finding.

[0039] After edge finding is completed, the control unit 5 drives the moving unit 12 and the second clamping assembly 22 to move axially according to the program instructions, so that the focus of the cutting unit 11 is aligned with the predetermined cutting position on the pipe. At this time, since the second clamping assembly 22 has pushed the pipe to the corresponding position, the support block 41 extends into the pipe.

[0040] Subsequently, the control unit 5 controls the gas storage unit to deliver inert gas. The gas enters the connecting box 31 through the connecting pipe 33 and is filled into the pipe through the connecting hole 34. The high-pressure inert gas flows in the pipe cavity, enters the air inlet 45 opened on the support block 41 with the opening facing the clamping part 2, and then flows into the sliding cavity 43.

[0041] After the gas enters the sliding cavity 43, it acts on the area of ​​the frustum 44 near the air inlet 45. Driven by the gas pressure, the frustum 44 overcomes the resistance of the elastic element 48 at the end away from the air inlet 45 and slides linearly away from the air inlet 45.

[0042] When the frustum 44 slides, the multiple T-shaped limiting grooves 46 on its inclined surface push the end of the support rod 47. Because the support rod 47 is radially guided and constrained by the sidewall of the support block 41, the inclined surface movement of the frustum 44 is converted into a precise linear movement of the support rod 47 radially outward along the pipe. The free end of the support rod 47 penetrates the sidewall of the support block 41, causing the arc-shaped support plate 42 to open outward synchronously until the support plate 42 is tightly fitted against the inner wall of the pipe, thus providing flexible support to the pipe from the inside. At this time, the venting groove 49 on the sidewall of the sliding cavity 43 vents air, maintaining the internal air pressure in a dynamic balance, ensuring sufficient support force while preventing excessive pressure from damaging the pipe wall.

[0043] After the support is established, the control unit 5 maintains the internal air pressure of the pipe and drives the cutting unit 11 to cut the pipe. During the cutting process, the first clamping assembly 21 provides precise circumferential rotational motion to ensure the continuity of the cut; while the supporting force of the support plate 42 counteracts the gravity of the cut section, preventing it from sagging or bending.

[0044] During the laser cutting of the tube wall, the support plate 42 remains in a supporting state until the tube is completely separated, preventing edge chipping or step defects caused by gravity at the moment of separation. After the tube is completely cut, the control unit 5 issues a command to stop the gas storage unit from supplying inert gas. As the gas supply stops, the air pressure in the sliding cavity 43 is quickly discharged to the outside through the exhaust groove 49. With the pressure gone, the compressed elastic element 48 begins to release its elastic potential energy, pushing the frustum 44 to reset towards the air inlet 45. During the reset of the frustum 44, the inclined surface of the limiting groove 46 actively pulls the support rod 47 back towards the center, causing the support plate 42 to retract radially inward, completely separating from the cut tube wall. Finally, the control unit 5 can drive the second clamping assembly 22 and other components to return to their initial positions, allowing the operator or automated device to remove the cut tube, thus completing the entire processing.

[0045] Example 2 As can be seen from the above embodiments, when cutting local features such as mounting holes for folding devices, the high-temperature metal debris and slag generated during cutting can easily enter the inner wall of the pipe through the cut. These high-temperature debris will fuse or adhere to the inner wall of the pipe upon contact, and after cooling, they will firmly adhere to the inner surface of the pipe cavity. This not only makes them difficult to remove but also affects the passage and assembly of internal conduits during subsequent use, posing a serious hidden danger to the electrical wiring of the electric scooter. Simultaneously, during the cutting of mounting holes, the local temperature rises rapidly in the cutting area due to concentrated laser heat input. Thin-walled pipes are prone to hole deformation or excessively large heat-affected zones in this area. If the airflow inside the pipe lacks effective guidance, it is difficult to effectively cool the cutting area, making it difficult to guarantee processing quality.

[0046] To resolve the above technical issues, please refer to Figures 1 to 6 As shown, the flow guiding section 3 includes a flow guiding component 32, which can guide the gas inside the pipe. Control unit 5: When cutting the folder mounting hole, control the second clamping assembly 22 to introduce inert gas into the pipe and use the flow guide assembly 32 to guide the airflow to the cutting point. When cutting the pipe, control the second clamping assembly 22 to drive the pipe to move axially, so that the support part 4 extends into the pipe. After the pipe end cooperates with the flow guide assembly 32, control the introduction of inert gas to drive the support plate 42 to expand and support the pipe wall, maintain positive pressure inside the pipe to prevent debris from being sucked back.

[0047] The flow guiding assembly 32 includes a support shaft 321 fixedly connected to the moving plate 1221. The support shaft 321 is coaxially arranged with the first clamping assembly 21 and the second clamping assembly 22. A sealing plate 322 is coaxially arranged on the support shaft 321. A sealing strip 323 that can cooperate with the end of the pipe is provided on the sealing plate 322. When the second clamping assembly 22 pushes the pipe to move axially, so that the pipe end hits the sealing plate 322, the sealing strip 323 is squeezed and deformed, filling the micro gap between the pipe end face and the sealing plate 322, forming a reliable end face seal.

[0048] A guide plate 324 is provided on the support block 41, and the guide plate 324 is fixedly connected to the support plate on the upper side of the support plate 42. A guide groove 325 is opened on the guide plate 324. The upper end of the guide groove 325 is connected to the outside, and the lower end of the guide groove 325 can be connected to the exhaust groove 49 at the upper end. When the folder mounting hole is cut, the inert gas introduced into the pipe does not flow randomly. When the airflow passes through the area of ​​the support block 41, part of it will enter the exhaust groove 49, and the lower end of the guide groove 325 can be connected to the exhaust groove 49 at the upper end, thereby drawing part of the gas out from the exhaust groove 49. The guide plate 324 is fixedly connected to the upper support plate 42, and the guide groove 325 opened on its surface provides a clear flow path for the gas. The gas flows upward along the guide groove 325 and finally exits from the upper end of the guide groove 325. The position where the upper end of the guide groove 325 is connected to the outside is close to the cutting area of ​​the mounting hole. The low-temperature inert gas that was originally flowing inside the pipe is precisely directed to the cutting point to force convection cooling of the cutting area, which helps to prevent the thin-walled pipe from deforming the hole or having an excessively large heat-affected zone due to excessive local heat input.

[0049] Based on the above embodiments, at the start of processing, the first clamping assembly 21 and the second clamping assembly 22 respectively perform centripetal clamping and positioning of the pipe. The first clamping assembly 21 is responsible for providing rotational drive, and the second clamping assembly 22 clamps the end of the pipe. At this time, the connecting hole 34 on the connecting box 31, which is fixedly connected to the adjusting block 221, communicates with the inside of the pipe. Subsequently, the control unit 5 drives the second driving unit 122 to work, which drives the adjusting block 221 to slide along the moving plate 1221 through the reciprocating screw 223, and then drives the pipe to move forward axially through the second clamping assembly 22. During this process, the displacement sensor 35 set on the support block 41 detects the distance between the pipe end and the support block 41 in real time. The control unit 5 determines the axial position of the pipe based on this distance data and completes automatic edge finding.

[0050] After edge finding is completed, the control unit 5 drives the cutting unit 11 to move to the processing position on the pipe near the pipe port. At this time, the distance between the pipe port and the support block 41 is controlled within a preset range, so that the support block 41 is close to the pipe port, but the pipe port has not yet come into contact with and been pressed against the sealing plate 322.

[0051] Control unit 5 starts the gas storage unit, and inert gas enters the connecting box 31 through connecting pipe 33 and is introduced into the pipe through connecting hole 34. The gas flows in the pipe cavity and enters the air inlet 45 of support block 41, and then flows into sliding cavity 43. Under the action of air pressure, frustum 44 undergoes a certain degree of axial displacement, causing support rod 47 and support plate 42 to open slightly outward in the radial direction. Since guide plate 324 is fixedly connected to the upper support plate 42, the outward movement of support plate 42 will cause guide plate 324 to rise synchronously.

[0052] As the guide plate 324 moves upward, the lower end of the guide groove 325 on it connects with the exhaust groove 49 at the upper end of the support block 41. At this time, part of the gas entering the sliding cavity 43 enters the guide groove 325 through the exhaust groove 49 and flows upward along the guide groove 325, eventually being discharged from the upper end of the guide groove 325. Since the position where the upper end of the guide groove 325 connects to the outside is exactly close to the cutting area of ​​the folder mounting hole, the discharged low-temperature inert gas is precisely guided to the cutting point, performing forced convection cooling on the cutting area.

[0053] Meanwhile, the airflow discharged from the guide groove 325 blows outward from the inside of the pipe. This airflow can blow away the metal debris and slag generated when cutting the mounting hole, reducing the risk of debris entering the inside of the pipe through the mounting hole and sticking to the inner wall. After the cutting unit 11 completes the cutting of the mounting hole according to the program, the control unit 5 controls the gas storage unit to stop supplying inert gas, the gas pressure in the sliding cavity 43 is released, the elastic element 48 pushes the frustum 44 to reset, and drives the support plate 42 and the guide plate 324 to retract.

[0054] After the mounting hole is cut, the control unit 5 drives the moving unit 12 and the second clamping assembly 22 according to the program instructions, so that the focus of the cutting unit 11 is aligned with the predetermined cutting position on the pipe. The second clamping assembly 22 pushes the pipe to move axially, so that the support block 41 extends deeper into the pipe until the pipe end contacts and presses against the sealing strip 323 on the sealing plate 322 in the flow guiding assembly 32, forming an end face seal.

[0055] At this time, the control unit 5 again controls the gas storage unit to deliver inert gas. The gas enters the pipe through the connecting box 31 and the connecting hole 34. Since the pipe port is blocked by the sealing plate 322, the gas entering the pipe is reversed after encountering the sealing plate 322, and pressure is built up inside the pipe cavity.

[0056] High-pressure gas flows into the sliding cavity 43 through the air inlet 45, pushing the frustum 44 to move backward against the resistance of the elastic element 48. Through the cooperation of the limiting groove 46 and the support rod 47, it drives the support plate 42 to open outward. At this time, the arc surface formed by multiple support plates 42 is close to the inner wall of the pipe, which just covers and seals the inner side of the previously cut mounting hole area. At the same time, the support plate 42 also provides internal support for the pipe wall near the cut area.

[0057] During the cutting operation, control unit 5 maintains the internal gas pressure of the pipe. The instant the laser cuts through the pipe wall, high-pressure inert gas inside the pipe is ejected outward from the newly cut opening, forming a positive pressure barrier to prevent metal debris and slag from entering the pipe through the cut opening.

[0058] After the pipe is completely cut, the control unit 5 stops the gas storage unit from supplying gas. The gas pressure in the sliding cavity 43 is discharged to the outside through the exhaust groove 49, and the elastic element 48 pushes the frustum 44 to reset, causing the support plate 42 to retract radially inward and separate from the cut pipe wall. Afterward, the clamping part 2 returns to its initial position, and the cut pipe can be removed, thus ending the entire processing.

[0059] Example 3 Please see Figures 1 to 6 As shown, the third embodiment of the present invention provides a laser cutting method for scooter tubing, comprising the following steps: S1: The pipe is centripetally clamped and positioned by the first clamping component 21 and the second clamping component 22; the control unit 5 drives the second drive unit 122 to move the pipe forward axially, and the displacement sensor 35 completes the automatic edge finding of the pipe end face.

[0060] S2: Control unit 5 drives cutting unit 11 to move to the position of the pipe to be processed and performs cutting of the folder mounting hole; during the cutting process, control unit 5 opens the connecting box 31 of the guide section 3 and fills the pipe with inert gas through the inner hole of the second clamping component 22; under the guidance of the preset guide plate 324, the airflow is precisely blown to the cutting area of ​​the mounting hole for cooling and blown out from the inside of the pipe to prevent cutting debris from sticking to the wall; after the mounting hole is cut, the inert gas is stopped.

[0061] S3: Control unit 5 drives moving unit 12 and second clamping assembly 22 to align the focus of cutting unit 11 with the cutting position of pipe; at this time, support block 41 extends into the pipe and the pipe end forms an end face seal with sealing plate 322; the connection box 31 is reopened and inert gas is introduced, and the pneumatic pressure drives the frustum 44 in sliding cavity 43 to move backward, and the inclined plane causes support rod 47 and support plate 42 to open outward, providing flexible support to the pipe wall from the inside and eliminating the suspended state of the pipe cutting section.

[0062] S4: Positive pressure cutting and debris discharge. Control unit 5 maintains the internal air pressure of the pipe and drives cutting unit 11 to perform pipe cutting operation. At the moment the pipe is cut through, the internal high-pressure inert gas is sprayed outward from the new cut to form a positive pressure barrier, preventing metal debris and slag from entering the pipe. At the same time, support plate 42 maintains the support state until the pipe is completely separated, preventing the cut section from bending or chipping due to gravity.

[0063] S5: After the pipe is cut and released, the control unit 5 stops the supply of inert gas, the air pressure inside the sliding cavity 43 is released, the frustum 44 is reset under the action of the elastic element 48, and the support plate 42 is driven to retract inward and separate from the pipe wall; then the clamping part 2 is retracted, the cut pipe is released and taken out.

[0064] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A three-dimensional laser cutting machine for scooter tubes, comprising a main body (1) provided with a cutting unit (11) and a moving unit (12), characterized in that, Also includes: Clamping part (2): It includes a first clamping assembly (21) and a second clamping assembly (22) capable of controlling the axial movement of the pipe; The flow guiding section (3) includes a connecting box (31) and a flow guiding component (32). The connecting box (31) can deliver gas into the pipe through the connecting pipe (33), and the flow guiding component (32) can guide the gas in the pipe. Support part (4): It includes a support block (41), on which a plurality of support plates (42) are provided, and the support plates (42) can support the inner wall of the pipe by gas driving in the pipe; Control Unit (5): The control unit (5) is electrically connected to the moving unit (12), the cutting unit (11) and the clamping part (2) respectively; when cutting the folder mounting hole, the second clamping component (22) is controlled to introduce inert gas into the pipe and the airflow is directed to the cutting point by the flow guiding component (32); when cutting the pipe, the second clamping component (22) is controlled to drive the pipe to move axially, so that the support part (4) extends into the pipe, and after the pipe end cooperates with the flow guiding component (32), the inert gas is controlled to drive the support plate (42) to expand the support pipe wall and maintain positive pressure inside the pipe to prevent debris from being sucked back.

2. The three-dimensional laser cutting machine according to claim 1, characterized in that, The moving unit (12) includes a first driving part (121) for controlling the movement of the cutting unit (11) and a second driving part (122) for controlling the movement of the clamping part (2). The second driving part (122) includes a moving plate (1221).

3. The three-dimensional laser cutting machine according to claim 2, characterized in that, The movable plate (1221) is rotatably connected to the first clamping assembly (21). The second clamping assembly (22) includes an adjusting block (221). The adjusting block (221) is slidably connected to the movable plate (1221). The movable plate (1221) is provided with a drive motor (222). The output end of the drive motor (222) is coaxially fixedly connected to a reciprocating screw (223) that is rotatably connected to the movable plate (1221). The adjusting block (221) is threadedly connected to the reciprocating screw (223).

4. The three-dimensional laser cutting machine according to claim 1, characterized in that, The support block (41) has a sliding cavity (43) inside, and a frustum (44) is slidably connected inside the sliding cavity (43). The support block (41) has an air inlet (45) with its opening facing the clamping part (2) and communicating with the sliding cavity (43). The area of ​​the frustum (44) near the air inlet (45) is larger than the area of ​​its end away from the air inlet (45).

5. The three-dimensional laser cutting machine according to claim 4, characterized in that, The truncated cone (44) has multiple T-shaped limiting grooves (46), and a support rod (47) is slidably connected in the limiting groove (46). The support rod (47) is slidably connected to the side wall of the support block (41), and the free end of the support rod (47) passes through the side wall of the support block (41) and is provided with an arc-shaped support plate (42).

6. The three-dimensional laser cutting machine according to claim 5, characterized in that, The end of the truncated cone (44) away from the air inlet (45) is connected to the side wall of the sliding cavity (43) via an elastic element (48). The support block (41) has multiple exhaust grooves (49) on its side wall near the air inlet (45). One end of the exhaust groove (49) is connected to the sliding cavity (43) and the other end is connected to the outside.

7. The three-dimensional laser cutting machine according to claim 6, characterized in that, The flow guiding assembly (32) includes a support shaft (321) fixedly connected to the moving plate (1221). The support shaft (321) is coaxially arranged with the first clamping assembly (21) and the second clamping assembly (22). A sealing plate (322) is coaxially arranged on the support shaft (321). A sealing strip (323) that can cooperate with the end of the pipe is provided on the sealing plate (322).

8. The three-dimensional laser cutting machine according to claim 3, characterized in that, The connecting box (31) has a connecting hole (34) that communicates with the second clamping assembly (22). The connecting box (31) is fixedly connected to the adjusting block (221). The support block (41) is provided with a displacement sensor (35). The displacement sensor (35) is used to detect the distance between the pipe port and the support block (41).

9. The three-dimensional laser cutting machine according to claim 1, characterized in that, The support block (41) is provided with a guide plate (324), which is fixedly connected to the support plate (42) located on the upper side. The guide plate (324) is provided with a guide groove (325), the upper end of the guide groove (325) is connected to the outside, and the lower end of the guide groove (325) can be connected to the exhaust groove (49) at the upper end.

10. A cutting method for cutting scooter tubing using a three-dimensional laser cutting machine according to any one of claims 1-9, characterized in that, The cutting method includes the following steps: S1: The pipe is centripetally clamped and positioned by the first clamping component (21) and the second clamping component (22); the control unit (5) drives the second driving part (122) to move the pipe forward axially, and the displacement sensor (35) completes the automatic edge finding of the pipe end face; S2: The control unit (5) drives the cutting unit (11) to move to the pipe to be processed position and performs the cutting of the folder mounting hole; during the cutting process, the control unit (5) opens the connecting box (31) of the guide part (3) and fills the pipe with inert gas through the inner hole of the second clamping component (22); under the guidance of the preset guide plate (324), the airflow is precisely blown to the cutting area of ​​the mounting hole for cooling and blown out from the inside of the pipe to prevent cutting debris from sticking to the wall; after the mounting hole is cut, the inert gas is stopped. S3: The control unit (5) drives the moving unit (12) and the second clamping assembly (22) to align the focus of the cutting unit (11) with the cutting position of the pipe; the support block (41) extends into the pipe and the pipe end forms an end face seal with the sealing plate (322); the connecting box (31) is reopened and inert gas is introduced, and the frustum (44) in the sliding cavity (43) is driven to retreat by the air pressure, and the support rod (47) and support plate (42) are forced to open outward by the inclined plane, so as to provide flexible support to the pipe wall from the inside and eliminate the suspended state of the pipe cutting section; S4: Positive pressure cutting and debris discharge. The control unit (5) maintains the internal air pressure of the pipe and drives the cutting unit (11) to perform the pipe cutting operation. At the moment the pipe is cut through, the internal high-pressure inert gas is sprayed outward from the new cut to form a positive pressure barrier, preventing metal debris and slag from entering the pipe. At the same time, the support plate (42) maintains the support state until the pipe is completely separated, preventing the cut section from bending or chipping due to gravity. S5: After the pipe is cut, the control unit (5) stops the inert gas supply, the internal pressure of the sliding cavity (43) is released, the truncated cone (44) is reset under the action of the elastic element (48), and the support plate (42) is driven to contract inward and separate from the pipe wall; then the clamping part (2) is retracted, the cut pipe is released and taken out.

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