Intelligent cutting equipment and cutting method

Abstract

The intelligent cutting equipment comprises a supporting frame, a pipe conveying mechanism, a pipe rotating mechanism and a cutting mechanism, the side face of the cutting mechanism is provided with a flow adjusting mechanism and a self-adaptive spray head, the pipe conveying mechanism comprises a sliding table, a lead screw and a first motor, the sliding table is slidably connected with the supporting frame, and the lead screw penetrates through the sliding table to be in threaded connection with the sliding table; the pipe rotating mechanism comprises a rotating disc, a chuck and a second motor, the rotating disc is rotationally connected with the supporting frame, the second motor is rotationally connected with the rotating disc through the synchronous belt and the synchronous wheel, the chuck is fixedly installed on the rotating disc, and the cutting mechanism comprises a laser cutting head and a telescopic air cylinder. The cutting mechanism is installed on the top of the supporting frame, and a cooling flow channel is formed in the side wall of the laser cutting head. The problem that in the prior art, a laser cutting head cooling refrigerant cannot be adjusted in a self-adaptive mode according to the cutting head, so that resources are wasted or the cooling effect is poor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe cutting, and in particular to an intelligent cutting device and a cutting method. Background Art

[0002] During the metal tube cutting process, laser equipment is usually used for cutting. Traditional laser cutting equipment usually includes a laser source, a cutting head, a feeding device and a control system. These devices are widely used in industrial production for cutting various metal materials. However, existing laser cutting equipment has some shortcomings.

[0003] When working continuously for a long time, the laser cutting head is prone to overheating, affecting the cutting quality and equipment life, and needs to be cooled. At present, most equipment uses a simple cooling water circulation system, which cannot be dynamically adjusted according to the actual temperature of the cutting head. When the laser cutting head cuts thick-walled metal pipes, the power is large and the temperature is high. When cutting thin-walled metal pipes, the power is small and the temperature is low. Traditional cooling systems often use a fixed flow of refrigerant. Regardless of how the temperature of the cutting head changes, a constant gas flow rate is maintained. This not only wastes resources, but may also affect the cooling effect due to excessive or small flow rates. Therefore, an intelligent cutting device and cutting method are needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide an intelligent cutting device and a cutting method, which have the advantages of good cooling effect and resource saving, and solve the problem in the prior art that the cooling refrigerant of the laser cutting head cannot be adaptively adjusted according to the cutting head, resulting in resource waste or poor cooling effect.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an intelligent cutting device, comprising a support frame, a pipe delivery mechanism, a pipe rotation mechanism and a cutting mechanism, wherein a flow regulating mechanism and an adaptive nozzle are arranged on the side of the cutting mechanism; The tube delivery mechanism comprises a slide, a screw and a first motor, the slide is slidably connected to the support frame, the screw passes through the slide and is threadedly connected to the slide, and the first motor is connected to the screw through a synchronous belt and a synchronous wheel; The pipe rotating mechanism comprises a rotating disk, a chuck and a second motor, the rotating disk is rotatably connected to the support frame, the second motor is rotatably connected to the rotating disk through a synchronous belt and a synchronous wheel, and the chuck is fixedly mounted on the rotating disk; The cutting mechanism comprises a laser cutting head and a telescopic cylinder, and the cutting mechanism is installed on the top of the support frame; A cooling channel is arranged in the side wall of the laser cutting head, the flow regulating mechanism is installed at the upper end of the cooling channel, and the adaptive nozzle is installed at the end of the cooling channel.

[0006] As a preferred intelligent cutting device of the present invention, the cooling channel is a spiral channel, an air inlet is provided at the top of the cooling channel, an exhaust port is provided at the bottom of the cooling channel, a sliding hole is provided on the upper end surface of the air inlet, and the flow regulating mechanism is fixedly installed at the upper end of the sliding hole.

[0007] As a preferred intelligent cutting device of the present invention, the flow regulating mechanism includes a temperature sensing hood, a bimetallic temperature sensing reed and a flow regulating piston, the two ends of the bimetallic temperature sensing reed are fixedly installed in the temperature sensing hood, the top of the flow regulating piston is installed on the bimetallic temperature sensing reed, and the flow regulating piston is inserted into the sliding hole and slidably connected to the laser cutting head.

[0008] As a preferred intelligent cutting device of the present invention, the bimetallic temperature-sensing reed includes a manganese-copper layer and a stainless steel layer, the manganese-copper layer is located at the upper end of the stainless steel layer, the bimetallic temperature-sensing reed is a downward-bent arc structure at 25 degrees Celsius, the flow regulating piston sleeve is arranged on the bimetallic temperature-sensing reed and is slidably connected to it, and the flow regulating piston is a hollow structure.

[0009] As a preferred intelligent cutting device of the present invention, a guide groove is provided on the top of the side end face of the laser cutting head, a guide rod matching with the temperature sensing cover is provided at the bottom, a fixing screw hole is provided at the bottom of the guide groove, and a bolt passes through the guide rod and is inserted into the fixing screw hole to fix the temperature sensing cover to the laser cutting head.

[0010] As a preferred intelligent cutting device of the present invention, the adaptive nozzle includes a nozzle, an elastic nozzle, a support spring and an adjusting threaded column, the top of the elastic nozzle is fixedly mounted on the inner wall of the nozzle, the support ring spring is fixedly mounted on the outside of the elastic nozzle, the side end face of the nozzle is provided with a screw hole, and the adjusting threaded column passes through the screw hole and is threadedly connected to the nozzle.

[0011] As a preferred intelligent cutting device of the present invention, the bottom of the elastic nozzle is a conical structure, the elastic nozzle is made of a rubber film or a silicone film, the supporting spring is a rectangular beryllium copper sheet, and a bending portion is provided on the supporting spring.

[0012] As a preferred intelligent cutting device of the present invention, the number of the adjusting threaded columns is the same as the number of the supporting springs and their positions correspond, and the front end of the adjusting threaded column is provided with a sliding rod elastically slidably connected by a spring, and the front end of the sliding rod is a ball top structure.

[0013] An intelligent cutting device and a cutting method, comprising the following steps: Step 1, fix the end of the metal tube on the slide, and fix the metal tube by clamping it with a chuck; Step 2: The first motor drives the screw to rotate, thereby driving the slide table to slide and feed the steel pipe, and the second motor drives the turntable to rotate to adjust the cutting angle; Step 3: Cut the metal tube by a laser welding head. During the welding process, the laser cutting head is cooled by introducing low-temperature nitrogen or low-temperature carbon dioxide into the cooling channel on the side wall of the laser welding head.

[0014] An intelligent cutting device and cutting method, in the process of step 3, the flow rate of low-temperature nitrogen can be adaptively adjusted according to the temperature of the laser cutting head, so as to avoid the waste of cooling gas or the temperature of the laser cutting head being too high, and the low-temperature nitrogen is finally sprayed near the cutting point through the adaptive nozzle, so as to cool the pipe fitting and isolate oxygen, reduce the generation of welding slag, and improve the incision quality. The adaptive nozzle can adaptively adjust the nozzle diameter according to the gas flow rate to keep the gas flow at a high flow rate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a cooling channel on the side wall of the laser cutting head. This design increases the contact area between the cooling medium and the laser cutting head and improves the cooling efficiency. The low-temperature gas in the cooling channel can not only effectively cool the laser cutting head, but also can be directly sprayed to the cutting point after cutting is completed to play a protective role. Through effective cooling measures, the performance of the laser cutting head can be prevented from being degraded due to overheating, thereby maintaining its long-term stable working state. The low-temperature gas forms a protective layer at the cutting point to isolate oxygen, reduce the occurrence of oxidation reaction, and further reduce the generation of welding slag, thereby improving the cutting quality.

[0016] 2. The present invention sets a flow regulating mechanism at the upper end of the cooling flow channel. The bimetallic temperature-sensitive reed in the flow regulating mechanism can automatically adjust the flow of the cooling gas according to the temperature change of the laser cutting head. This means that under high temperature conditions, the flow rate will automatically increase to enhance the cooling effect; while at lower temperatures, the flow rate will be reduced to avoid waste of resources. This adaptive adjustment mechanism can ensure that the most suitable cooling conditions can be provided under any working conditions, which not only saves resources, but also ensures efficient cooling effect and improves the intelligence level of the equipment.

[0017] 3. The present invention can automatically adjust the size of the nozzle according to the incoming gas flow rate through the adaptive nozzle to maintain a high gas flow rate. In this way, even under different flow conditions, it can ensure that the gas can be sprayed to the cutting point at a sufficiently high speed to provide the best cooling effect. The design of the adjustable threaded column allows the user to adjust the spray angle as needed, which enables the cooling gas to cover the cutting point more accurately, further improving the cooling effect and cutting quality, and further enhancing the intelligence of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention from a first viewing angle; Figure 2 It is a schematic diagram of the overall structure of the second viewing angle of the present invention; Figure 3 It is a schematic diagram of the cooperation state of the laser cutting head, the flow regulating mechanism and the adaptive nozzle of the present invention; Figure 4 It is a schematic diagram of the laser cutting head mechanism of the present invention; Figure 5 It is a cross-sectional view of the laser cutting head, the flow regulating mechanism and the adaptive nozzle in the present invention in a coordinated state; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 8 is a cross-sectional view of the flow regulating mechanism of the present invention; Fig. 9 It is a front view of the bimetallic temperature-sensing reed of the present invention; Fig.10 An exploded view of the adaptive sprinkler head of the present invention; Fig.11 It is a schematic diagram of the matching state of the elastic nozzle and the supporting spring of the present invention.

[0019] In the figure: 1, support frame; 2, pipe feeding mechanism; 201, slide; 202, screw rod; 203, first motor; 3, pipe rotating mechanism; 301, turntable; 302, chuck; 303, second motor; 4, cutting mechanism; 401, telescopic cylinder; 402, laser cutting head; 4021, cooling channel; 4022, air inlet; 4023, exhaust port; 4024, slide hole; 4025, guide groove; 5, Flow regulating mechanism; 501, temperature sensing cover; 5011, guide rod; 502, bimetallic temperature sensing spring; 5021, manganese copper layer; 5022, stainless steel layer; 503, flow regulating piston; 6, adaptive nozzle; 601, nozzle; 6011, screw hole; 602, elastic nozzle; 603, supporting spring; 6031, bending part; 604, adjusting threaded column; 6041, spring; 6042, sliding rod. DETAILED DESCRIPTION

[0020] See also Figure 1-Figure 11 , an intelligent cutting device, comprising a support frame 1, a tube feeding mechanism 2, a tube rotating mechanism 3 and a cutting mechanism 4, a flow regulating mechanism 5 and an adaptive nozzle 6 are arranged on the side of the cutting mechanism 4; The tube delivery mechanism 2 includes a slide 201, a screw rod 202 and a first motor 203. The slide 201 is slidably connected to the support frame 1, the screw rod 202 passes through the slide 201 and is threadedly connected thereto, and the first motor 203 is transmission-connected to the screw rod 202 through a synchronous belt and a synchronous wheel. The pipe rotating mechanism 3 includes a rotating disk 301, a chuck 302 and a second motor 303. The rotating disk 301 is rotatably connected to the support frame 1. The second motor 303 is rotatably connected to the rotating disk 301 through a synchronous belt and a synchronous wheel. The chuck 302 is fixedly mounted on the rotating disk 301. The cutting mechanism 4 includes a laser cutting head 402 and a telescopic cylinder 401, and the cutting mechanism 4 is installed on the top of the support frame 1; A cooling channel 4021 is provided in the side wall of the laser cutting head 402 , a flow regulating mechanism 5 is installed at the upper end of the cooling channel 4021 , and an adaptive nozzle 6 is installed at the end of the cooling channel 4021 .

[0021] Furthermore, the cooling channel 4021 is a spiral channel, an air inlet 4022 is provided at the top of the cooling channel 4021, an exhaust port 4023 is provided at the bottom of the cooling channel 4021, a sliding hole 4024 is provided on the upper end surface of the air inlet 4022, and the flow regulating mechanism 5 is fixedly installed at the upper end of the sliding hole 4024.

[0022] The spiral cooling channel 4021 increases the contact area between the cooling airflow and the laser cutting head 402, thereby improving the cooling effect. By setting a flow regulating mechanism 5 at the upper end of the slide hole 4024, the flow regulating mechanism 5 adaptively adjusts the opening of the slide hole 4024 according to the temperature of the laser cutting head 402, thereby adjusting the air intake flow rate to avoid the flow rate being too small to meet the cooling demand when the temperature is high, or the gas flow rate being too large to cause waste when the temperature is too low.

[0023] Furthermore, the flow regulating mechanism 5 includes a temperature sensing cover 501, a bimetallic temperature sensing reed 502 and a flow regulating piston 503. The two ends of the bimetallic temperature sensing reed 502 are fixedly installed in the temperature sensing cover 501, and the top of the flow regulating piston 503 is installed on the bimetallic temperature sensing reed 502. The flow regulating piston 503 is inserted into the sliding hole 4024 and is slidably connected to the laser cutting head 402.

[0024] The heat of the laser welding head is conducted to the inside through the temperature sensing cover 501. As the temperature rises, the bimetallic temperature sensing reed 502 undergoes elastic deformation, driving the flow regulating piston 503 to slide upward, thereby gradually increasing the opening of the air inlet 4022, increasing the air intake flow, and improving the cooling effect on the laser cutting head 402.

[0025] Furthermore, the bimetallic temperature-sensing reed 502 includes a manganese-copper layer 5021 and a stainless steel layer 5022. The manganese-copper layer 5021 is located at the upper end of the stainless steel layer 5022. The bimetallic temperature-sensing reed 502 is a downward-bent arc structure at 25 degrees Celsius. The flow regulating piston 503 is sleeved on the bimetallic temperature-sensing reed 502 and is slidably connected thereto. The flow regulating piston 503 is a hollow structure.

[0026] The thermal expansion coefficient of manganese bronze is much higher than that of stainless steel. When the temperature gradually rises, the deformation of manganese bronze is much greater than that of stainless steel, so that the temperature-sensitive bimetallic reed gradually bends upward, lifting the flow regulating piston 503. The hollow structure of the flow regulating piston 503 greatly reduces its weight, thereby reducing the load on the temperature-sensitive bimetallic reed.

[0027] Furthermore, a guide groove 4025 is provided at the top of the side end surface of the laser cutting head 402, and a guide rod 5011 matching with the temperature sensing cover 501 is provided at the bottom, and a fixing screw hole is provided at the bottom of the guide groove 4025. The bolt passes through the guide rod 5011 and is inserted into the fixing screw hole to fix the temperature sensing cover 501 and the laser cutting head 402.

[0028] Through the cooperation of the guide groove 4025 and the guide rod 5011, the temperature sensing cover 501 is guided vertically downward to cooperate with the laser cutting head 402, so that the flow regulating piston 503 can be accurately matched with the sliding hole 4024, reducing the difficulty of installation. The bolt-type installation structure ensures the tightness of the connection between the temperature sensing cover 501 and the laser cutting head 402.

[0029] Furthermore, the adaptive nozzle 6 includes a nozzle 601, an elastic nozzle 602, a support spring 603 and an adjusting threaded column 604. The top of the elastic nozzle 602 is fixedly mounted on the inner wall of the nozzle 601, the support ring spring is fixedly mounted on the outer side of the elastic nozzle 602, and a screw hole 6011 is provided on the side end face of the nozzle 601. The adjusting threaded column 604 passes through the screw hole 6011 and is threadedly connected to the nozzle 601.

[0030] By supporting the spring 603 and the elastic nozzle 602, the nozzle can maintain a smaller air outlet without being affected by external forces, thereby maintaining the injection pressure of the nozzle to meet the injection speed of the airflow, so that the cooling gas can reach the cutting point, cool the cutting point, and improve the cutting effect. By rotating the adjusting threaded column 604, the length of the spiral threaded column is changed, thereby changing the expansion angle of the supporting spring 603, limiting the shape of the elastic nozzle 602, and adjusting the injection angle of the elastic nozzle 602.

[0031] Furthermore, the bottom of the elastic nozzle 602 is a conical structure, the elastic nozzle 602 is made of a rubber film or a silicone film, the supporting spring 603 is a rectangular beryllium copper sheet, and a bending portion 6031 is provided on the supporting spring 603 .

[0032] The conical elastic nozzle 602 keeps contraction in a natural state. When the internal airflow pressure is too large, it can open to increase the airflow rate. The stability of the elastic nozzle 602 is improved by supporting the spring 603 to prevent it from swinging repeatedly under the action of the airflow. The design of the bending portion 6031 allows the supporting spring 603 to undergo elastic deformation along the bending portion 6031, thereby keeping the bending positions of each supporting spring 603 uniform and improving the stability of the nozzle.

[0033] Furthermore, the number of adjusting threaded columns 604 is the same as the number of supporting springs 603 and their positions correspond. The front end of the adjusting threaded column 604 is provided with a sliding rod 6042 elastically slidably connected by a spring 6041, and the front end of the sliding rod 6042 is a ball-top structure.

[0034] The multi-adjustable threaded column 604 structure makes the adjustment direction of the elastic nozzle 602 more variable, and the elastically connected sliding rod 6042 structure makes the end curve of the elastic nozzle 602 smoother. The ball-top sliding rod 6042 structure reduces the friction resistance between the sliding rod 6042 and the supporting spring 603, thereby improving the smoothness of the equipment.

[0035] See also Figure 1-Figure 11 , an intelligent cutting device and a cutting method, comprising the following steps: Step 1: fix the end of the metal tube on the slide 201, and fix the other end of the metal tube by clamping the metal tube with the chuck 302 to complete the installation of the raw material; Step 2: The first motor 203 drives the screw rod 202 to rotate, thereby driving the slide 201 to slide under the action of the screw rod 202, and the slide 201 drives the steel pipe to be fed, and the point to be cut is moved to the bottom of the laser cutting head 402. The second motor 303 drives the turntable 301 to rotate, thereby driving the metal pipe to rotate to adjust the cutting angle, and the telescopic cylinder 401 adjusts the height of the laser cutting head 402 to prepare for cutting.

[0036] Step 3: Cut the metal pipe through the laser welding head. During the welding process, low-temperature nitrogen or low-temperature carbon dioxide is continuously introduced into the air inlet 4022 of the cooling channel 4021 on the side wall of the laser welding head to cool the laser cutting head 402. The cooled nitrogen or carbon dioxide is sprayed around the cutting point to isolate the air around the cutting point and cool the pipe at the same time to improve the cutting effect.

[0037] During step 3, when the temperature of the laser cutting head 402 rises, the bimetallic temperature-sensitive reed 502 bends upward due to the different thermal expansion coefficients of the manganese-copper layer 5021 and the stainless steel layer 5022, thereby driving the flow regulating piston 503 to move upward and increasing the nitrogen flow. The flow of low-temperature nitrogen can be adaptively adjusted according to the temperature of the laser cutting head 402, thereby avoiding the waste of cooling gas or the excessive temperature of the laser cutting head 402. The low-temperature nitrogen is finally sprayed near the cutting point through the adaptive nozzle 6 to cool the pipe fittings, isolate oxygen, reduce the generation of welding slag, and improve the incision quality. The adaptive nozzle 6 can adaptively adjust the nozzle diameter according to the gas flow to keep the gas flow at a high flow rate. The adaptive nozzle 6 can expand elastically according to the nitrogen flow rate, so that the airflow ejected by the adaptive nozzle 6 maintains a high flow rate, avoiding insufficient flow rate and failure to cover the welding point, or too small aperture, which limits the gas flow and affects heat dissipation. The threaded adjustment column 604 structure can limit the shape of the elastic nozzle 602, thereby changing the injection angle of the elastic nozzle 602 so that the gas ejected by it can accurately reach the welding point.

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

Claims

1. An intelligent cutting device, comprising a support frame (1), a tube feeding mechanism (2), a tube rotating mechanism (3) and a cutting mechanism (4), characterized in that: A flow regulating mechanism (5) and an adaptive nozzle (6) are provided on the side of the cutting mechanism (4); The tube delivery mechanism (2) comprises a slide (201), a screw rod (202) and a first motor (203); the slide (201) is slidably connected to the support frame (1); the screw rod (202) passes through the slide (201) and is threadedly connected thereto; and the first motor (203) and the screw rod (202) are transmission-connected via a synchronous belt and a synchronous wheel. The pipe rotating mechanism (3) comprises a rotating disk (301), a chuck (302) and a second motor (303); the rotating disk (301) is rotationally connected to the support frame (1); the second motor (303) is rotationally connected to the rotating disk (301) via a synchronous belt and a synchronous wheel; and the chuck (302) is fixedly mounted on the rotating disk (301); The cutting mechanism (4) comprises a laser cutting head (402) and a telescopic cylinder (401), and the cutting mechanism (4) is installed on the top of the support frame (1); A cooling channel (4021) is provided in the side wall of the laser cutting head (402), the flow regulating mechanism (5) is installed at the upper end of the cooling channel (4021), and the adaptive nozzle (6) is installed at the end of the cooling channel (4021).

2. The intelligent cutting device according to claim 1, characterized in that: The cooling channel (4021) is a spiral channel, an air inlet (4022) is provided at the top of the cooling channel (4021), an exhaust port (4023) is provided at the bottom of the cooling channel (4021), a sliding hole (4024) is provided on the upper end surface of the air inlet (4022), and the flow regulating mechanism (5) is fixedly mounted on the upper end of the sliding hole (4024).

3. The intelligent cutting device according to claim 2, characterized in that: The flow regulating mechanism (5) comprises a temperature sensing cover (501), a bimetallic temperature sensing reed (502) and a flow regulating piston (503); both ends of the bimetallic temperature sensing reed (502) are fixedly mounted in the temperature sensing cover (501); the top of the flow regulating piston (503) is mounted on the bimetallic temperature sensing reed (502); and the flow regulating piston (503) is inserted into a sliding hole (4024) and is slidably connected to the laser cutting head (402).

4. The intelligent cutting device according to claim 3, characterized in that: The bimetallic temperature-sensing reed (502) comprises a manganese-copper layer (5021) and a stainless steel layer (5022), the manganese-copper layer (5021) being located at the upper end of the stainless steel layer (5022), the flow regulating piston (503) being sleeved on the bimetallic temperature-sensing reed (502) and slidably connected thereto, and the flow regulating piston (503) is a hollow structure.

5. The intelligent cutting device according to claim 4, characterized in that: A guide groove (4025) is provided at the top of the side end surface of the laser cutting head (402), and a guide rod (5011) cooperating therewith is provided at the bottom of the temperature sensing cover (501).

6. The intelligent cutting device according to claim 1, characterized in that: The adaptive nozzle (6) comprises a nozzle (601), an elastic nozzle (602), a support spring (603) and an adjusting threaded column (604); the top of the elastic nozzle (602) is fixedly mounted on the inner wall of the nozzle (601); the support ring spring is fixedly mounted on the outer side of the elastic nozzle (602); a screw hole (6011) is provided on the side end surface of the nozzle (601); and the adjusting threaded column (604) passes through the screw hole (6011) and is threadedly connected to the nozzle (601).

7. An intelligent cutting device as claimed in claim 6, characterized in that: The bottom of the elastic nozzle (602) is a conical structure. The elastic nozzle (602) is made of a rubber film or a silicone film. The supporting spring sheet (603) is a rectangular beryllium copper sheet. A bending portion (6031) is provided on the supporting spring sheet (603).

8. The intelligent cutting device according to claim 7, characterized in that: The number of the adjusting threaded columns (604) is the same as the number of the supporting spring sheets (603) and their positions correspond. The front end of the adjusting threaded column (604) is provided with a sliding rod (6042) elastically slidably connected via a spring (6041), and the front end of the sliding rod (6042) is a ball-top structure.

9. A cutting method of an intelligent cutting device, applicable to an intelligent cutting device as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, fix the end of the metal tube on the slide (201), and clamp the metal tube with a chuck (302) to fix it; Step 2: The first motor (203) drives the screw rod (202) to rotate, thereby driving the slide table (201) to slide and feed the steel pipe, and the second motor (303) drives the turntable (301) to rotate to adjust the cutting angle; Step 3: Cut the metal tube using a laser welding head. During the welding process, the laser cutting head (402) is cooled by introducing low-temperature nitrogen or low-temperature carbon dioxide into the cooling channel (4021) on the side wall of the laser welding head.

10. A cutting method for an intelligent cutting device as claimed in claim 9, characterized in that: During step 3, the flow rate of the low-temperature nitrogen can be adaptively adjusted according to the temperature of the laser cutting head (402), thereby avoiding waste of cooling gas or excessive temperature of the laser cutting head (402), and the low-temperature nitrogen is finally sprayed near the cutting point through the adaptive nozzle (6), thereby cooling the pipe and isolating oxygen, reducing the generation of welding slag, and improving the quality of the incision. The adaptive nozzle (6) can adaptively adjust the nozzle diameter according to the gas flow rate to keep the gas flow at a high flow rate.

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