Cutting apparatus for stainless steel pipe manufacturing line
Patent Information
- Application Number
- CN202522428055.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-17
AI Technical Summary
[0004]本实用新型的目的在于提供一种不锈钢管制造线用切割设备，以解决上述背景技术中提出的不锈钢管机械锯切易因摩擦高温导致切口变形并产生毛刺、激光切割易形成挂渣且导致周边材料硬度下降，二者均需二次加工，提高了成本的问题
1、夹块与管材外形匹配并内置铜制冷却管，通过冷却水循环降低切割区域温度，有效抑制切口处的热变形，转盘驱动切割头旋转切割的设计，相比传统线性移动的切割模式，效率得到提升，尤其适合大批量连续作业；
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Figure CN224855180U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of stainless steel pipe manufacturing technology, specifically to a cutting device for stainless steel pipe manufacturing lines. Background Technology
[0002] Stainless steel pipe manufacturing line cutting equipment is a precision cutting tool for pipes. It is used to cut stainless steel pipe blanks into fixed lengths according to process requirements, providing a good foundation for subsequent welding, assembly and other processes. The application of the equipment significantly improves the production efficiency and product quality of stainless steel pipe manufacturing, and is an indispensable core equipment in modern pipe production lines.
[0003] In existing technologies, stainless steel pipe cutting mainly relies on mechanical sawing and laser cutting. Mechanical sawing uses a high-speed rotating saw blade to physically cut the pipe. During the cutting process, the intense friction between the saw blade and the pipe generates local high temperatures, causing phase transformation of the grain structure in the cut area and inducing radial shrinkage deformation at the pipe end. Furthermore, the sawing action easily forms burrs on the cut surface, requiring an additional deburring process. Laser cutting uses a high-energy-density laser beam to melt the pipe. Under the influence of gravity, the molten metal easily forms 0.5-1.2m of slag at the lower edge of the cut. At the same time, heat conduction causes a decrease in the hardness of the material around the cut. Both processes require additional secondary processing steps, increasing manufacturing costs and time. Utility Model Content
[0004] The purpose of this utility model is to provide a cutting device for stainless steel pipe manufacturing lines, in order to solve the problems mentioned in the background art, such as the easy deformation of the cut and the generation of burrs due to friction and high temperature when mechanically sawing stainless steel pipes, and the easy formation of slag and the decrease in hardness of the surrounding material when laser cutting, both of which require secondary processing and increase costs.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a cutting device for stainless steel pipe manufacturing lines, comprising a frame, a three-jaw chuck for fixing stainless steel pipes mounted on the frame, a turntable rotatably connected to the frame, the turntable rotating via power supplied from the frame, a feeding component on the turntable, a support frame mounted on the output end of the feeding component, a swing component mounted on the support frame, a laser cutting head for cutting stainless steel pipes mounted on the output end of the swing component, the feeding component for adjusting the distance between the laser cutting head and the stainless steel pipe, the swing component for adjusting the angle between the laser cutting head and the stainless steel pipe, a cavity opened in the horizontal part of the frame, a rotary motor mounted on the outer wall of the horizontal part of the frame, an opening and closing component disposed within the cavity, the opening and closing component being driven by the rotary motor, a column fixedly connected to the output end of the opening and closing component, a clamping block fixedly connected to the upper end of the column, the clamping block for clamping the cutting part of the stainless steel pipe, a cooling pipe disposed within the clamping block, and both the inlet and outlet of the cooling pipe being connected to an external water supply source.
[0006] According to the preferred embodiment of this technical solution, the feed assembly includes a U-shaped frame fixedly connected to the turntable, a servo motor mounted on the outer wall of the U-shaped frame, a screw rotatably connected to the U-shaped frame, and a drive block threadedly connected to the screw. The surface of the drive block is fixedly connected to the surface of the support frame, and the output end of the servo motor is connected to one end of the screw. The servo motor is used to drive the screw to rotate.
[0007] In a preferred embodiment of this technical solution, a guide rail is fixedly connected to the turntable, and a slider is slidably connected to the guide rail, with the connecting surface of the slider being fixedly connected to the surface of the support frame.
[0008] Based on the preferred embodiment of this technical solution, the swing assembly includes a support plate one and a support plate two integrally fixedly connected to the surface of the support frame, an electric cylinder mounted on the support plate one, a guide shaft fixedly connected to the support plate two, a rack mounted on the output end of the electric cylinder, a rotating frame fixedly connected to the surface of the support frame, a rotating shaft rotatably connected to the rotating frame, and a flat gear fixedly connected to the outer wall of the rotating shaft. The rack meshes with the flat gear, the rack slides with the outer wall of the guide shaft, and the outer wall of the rotating shaft is fixedly connected to the laser cutting head.
[0009] In a preferred embodiment of this technical solution, a base is fixedly connected to the side wall of the laser cutting head's outer shell, a nitrogen nozzle is installed inside the base, a nitrogen tank is installed at the upper end of the laser cutting head's outer shell, and the nitrogen nozzle is connected to the nitrogen tank via a hose, with the nitrogen nozzle facing the cutting area.
[0010] According to the preferred embodiment of this technical solution, the opening and closing assembly includes a bidirectional lead screw rotatably connected in the cavity, a movable seat threadedly connected to the bidirectional lead screw, and a slot formed on the horizontal surface of the frame. The upper end of the movable seat is fixedly connected to the lower end of the column, and the column moves within the slot through the movable seat. One end of the bidirectional lead screw is connected to the output end of a rotary motor, which drives the bidirectional lead screw to rotate.
[0011] In the preferred embodiment of this technical solution, a convex rail is fixedly connected to the bottom of the cavity, and a concave block is slidably connected to the convex rail. The upper end of the concave block is fixedly connected to the lower end of the movable seat.
[0012] In the preferred embodiment of this technical solution, a frame is provided at the upper end of the frame, and a support roller is rotatably connected to the frame. A conical sleeve is fixedly connected to the outer wall of the support roller, and the support rollers are distributed along the long side of the frame.
[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. The clamping block matches the shape of the pipe and has a built-in copper cooling pipe. The temperature of the cutting area is reduced by cooling water circulation, which effectively suppresses thermal deformation at the cut. The design of the rotary table driving the cutting head to rotate and cut improves efficiency compared with the traditional linear movement cutting mode, and is especially suitable for large-volume continuous operation. 2. The feed assembly enables precise adjustment of the distance between the cutting head and the pipe, adapting to different pipe diameter requirements. The swing assembly adopts electric cylinder-gear rack and pinion transmission, combined with angle encoder feedback, to meet the requirements of complex processes such as oblique cutting and improve the flexibility of the equipment. 3. The laser cutting head integrates nitrogen protection and synchronous slag blowing functions. It monitors the focal point temperature in real time through a temperature sensor and, together with the inert gas environment controlled by a solenoid valve, reduces oxidation and slag buildup, thus improving the quality of the cut. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of one embodiment of a cutting device for a stainless steel pipe manufacturing line according to the present invention; Figure 2 This is a front view of the present utility model; Figure 3 This is a schematic diagram of the structure of the feed assembly of this utility model; Figure 4 This is a schematic diagram of the structure of the nitrogen nozzle of this utility model; Figure 5 This is a schematic diagram of the structure of the swing assembly of this utility model; Figure 6 This is a schematic diagram of the opening and closing component of this utility model.
[0015] In the diagram: 1. Frame; 2. Three-jaw chuck; 3. Turntable; 4. Support frame; 5. Laser cutting head; 6. Rotary motor; 7. Column; 8. Clamping block; 9. Cooling pipe; 10. U-shaped frame; 11. Servo motor; 12. Screw; 13. Drive block; 14. Guide rail; 15. Slider; 16. Support plate one; 17. Support plate two; 18. Electric cylinder; 19. Rack; 20. Guide shaft; 21. Rotating frame; 22. Rotating shaft; 23. Flat gear; 24. Base; 25. Nitrogen nozzle; 26. Nitrogen tank; 27. Hose; 28. Two-way lead screw; 29. Moving seat; 30. Groove; 31. Convex rail; 32. Concave block; 33. Frame; 34. Support roller; 35. Conical sleeve. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Please see Figures 1-6This utility model provides an embodiment: a cutting device for stainless steel pipe manufacturing lines, including a frame 1, a three-jaw chuck 2 for fixing stainless steel pipes mounted on the frame 1, a turntable 3 rotatably connected to the frame 1, the turntable 3 being powered by the frame 1 to rotate, a feed assembly on the turntable 3, a support frame 4 mounted on the output end of the feed assembly, a swing assembly on the support frame 4, and a laser cutting head 5 for cutting the stainless steel pipes mounted on the output end of the swing assembly. The feed assembly is used to adjust the distance between the laser cutting head 5 and the stainless steel pipes, the swing assembly is used to adjust the angle between the laser cutting head 5 and the stainless steel pipes, and the horizontal part of the frame 1... The machine has a cavity. A rotary motor 6 is installed on the outer wall of the horizontal part of the frame 1. An opening and closing assembly is installed inside the cavity. The opening and closing assembly is driven by the rotary motor 6. A column 7 is fixedly connected to the output end of the opening and closing assembly. A clamping block 8 is fixedly connected to the upper end of the column 7. The clamping block 8 is used to clamp the cutting part of the stainless steel pipe. A cooling pipe 9 is installed inside the clamping block 8. The inlet and outlet of the cooling pipe 9 are both connected to an external water supply. The three-jaw chuck 2 is hydraulically driven, and the clamping force of a single jaw can reach 5000N. A pressure sensor is installed inside the three-jaw chuck 2 to monitor the clamping force in real time. The surface of the three-jaw chuck 2 is chrome-plated to improve wear resistance. The feed assembly drives the support frame. 4. Movement allows for precise adjustment of the distance between the laser cutting head 5 and the pipe, adapting to different pipe diameter cutting needs. The oscillating component adjusts the angle of the laser cutting head 5, and the PLC calculates the optimal cutting angle based on the pipe diameter to meet different cutting methods, such as beveling. The laser cutting head 5 uses a fiber optic transmission structure, and the focusing lens achieves dynamic focusing through pneumatic drive. A protective structure is installed on the laser cutting head 5 to blow away molten residue and prevent slag buildup. A built-in temperature sensor on the laser cutting head 5 monitors the focal point temperature in real time to prevent overheating damage. The opening and closing component opens and closes the clamping block 8, and a displacement sensor monitors the position of the clamping block 8 in real time to ensure uniform clamping force. The clamping block 8 matches the shape of the pipe to increase the contact area. The clamping block 8 is equipped with a cooling pipe 9 (made of copper) to reduce the temperature of the cutting area and prevent the pipe from thermally deforming. During operation, the stainless steel pipe enters the three-jaw chuck 2 through the traction device on the production line. The three-jaw chuck 2 clamps the pipe. The rotary motor 6 drives the opening and closing assembly. The clamping block 8 holds the cutting point. The feed assembly adjusts the position of the cutting head, the swing assembly adjusts the tilt angle of the cutting head, the turntable 3 rotates and drives the support frame to rotate. At the same time, the laser cutting head 5 emits a laser, the cooling pipe 9 is filled with cooling water, and the synchronous air blowing device blows away the residue. After the cutting is completed, all components are reset to prepare for the next batch of cutting.
[0018] Please see Figure 3A further solution based on this embodiment is as follows: The feed assembly includes a U-shaped frame 10 fixedly connected to the turntable 3, a servo motor 11 mounted on the outer wall of the U-shaped frame 10, a screw 12 rotatably connected to the U-shaped frame 10, and a drive block 13 threadedly connected to the screw 12. The surface of the drive block 13 is fixedly connected to the surface of the support frame 4. The output end of the servo motor 11 is connected to one end of the screw 12. The servo motor 11 is used to drive the screw 12 to rotate. The U-shaped frame 10 is fixed to the turntable 3 by bolts to form a stable support structure. The surface of the U-shaped frame 10 is sandblasted and then coated with anti-rust paint to improve corrosion resistance. The bottom of the U-shaped frame 10 is provided with reinforcing ribs to withstand vibration loads during the feeding process. The screw 12 is rotatably connected to the U-shaped frame 10 through a thrust ball bearing. The servo motor 11 drives the screw 12 to rotate through an elastic coupling, which drives the drive block 13 (made of aluminum alloy) to move along the axial direction of the screw 12. The surface of the screw 12 is treated with high-frequency quenching to improve wear resistance.
[0019] Please see Figure 3 A further solution based on this embodiment is as follows: a guide rail 14 is fixedly connected to the turntable 3, and a slider 15 is slidably connected to the guide rail 14. The connecting surface of the slider 15 is fixedly connected to the surface of the support frame 4. The guide rail 14 is locked to the turntable 3 by bolts. The slider 15 and the guide rail 14 form a sliding fit. Its connecting surface is fixed to the support frame 4 by bolts. When the drive block 13 moves, the slider 15 slides along the guide rail 14, constraining the support frame 4 to retain only the horizontal degree of freedom and preventing skewing.
[0020] Please see Figure 5 A further embodiment of this solution is as follows: the swing assembly includes a first support plate 16 and a second support plate 17 integrally fixedly connected to the surface of the support frame 4, an electric cylinder 18 mounted on the first support plate 16, a guide shaft 20 fixedly connected to the second support plate 17, a rack 19 mounted on the output end of the electric cylinder 18, a rotating frame 21 fixedly connected to the surface of the support frame 4, a rotating shaft 22 rotatably connected to the rotating frame 21, and a spur gear 23 fixedly connected to the outer wall of the rotating shaft 22. The rack 19 meshes with the spur gear 23, and the rack 19 slides with the outer wall of the guide shaft 20. The outer wall of the rotating shaft 22 is fixedly connected to the laser cutting head 5. The first support plate 16 and the second support plate 17 are connected by welding. The integrated support frame 4 forms a stable support. The electric cylinder 18 is installed on the support plate 16, and its output end is connected to the rack 19. The rack 19 is slidably connected to the guide shaft 20 through a linear bearing. The guide shaft 20 is fixed to the support plate 17. The rack 19 meshes with the spur gear 23 for transmission. When the electric cylinder 18 extends or retracts, the rack 19 drives the spur gear 23 to rotate, which drives the rotating shaft 22 to rotate, thereby realizing the angle adjustment of the laser cutting head 5. The rotating frame 21 (made of aluminum alloy) is welded to the support frame 4. The rotating shaft 22 is connected to the rotating frame 21 through a bearing. An angle encoder is set on the surface of the rotating frame 21 to provide real-time feedback on the cutting head tilt angle. The PLC calculates the optimal cutting angle based on the pipe diameter.
[0021] Please see Figure 4 A further embodiment of this solution is as follows: A base 24 is fixedly connected to the side wall of the outer shell of the laser cutting head 5. A nitrogen nozzle 25 is provided inside the base 24. A nitrogen tank 26 is installed on the upper end of the outer shell of the laser cutting head 5. The nitrogen nozzle 25 and the nitrogen tank 26 are connected through a hose 27. The nitrogen nozzle 25 faces the cutting area. The nitrogen tank 26 is installed on the upper end of the outer shell of the laser cutting head 5 and connected to the nitrogen nozzle 25 inside the base 24 through the hose 27. The nitrogen nozzle 25 faces the cutting area, forming a local inert gas environment to prevent the pipe from oxidizing during the cutting process. At the same time, it can also blow away molten residue and prevent slag from sticking. The nitrogen flow rate is precisely controlled by a solenoid valve.
[0022] Please see Figure 6 A further solution based on this embodiment is as follows: the opening and closing assembly includes a bidirectional lead screw 28 rotatably connected in the cavity, a movable seat 29 threadedly connected to the bidirectional lead screw 28, and a slot 30 opened on the horizontal surface of the frame 1. The upper end of the movable seat 29 is fixedly connected to the lower end of the column 7. The column 7 moves within the slot 30 via the movable seat 29. One end of the bidirectional lead screw 28 is connected to the output end of the rotary motor 6. The rotary motor 6 is used to drive the bidirectional lead screw 28 to rotate. The bidirectional lead screw 28 is rotatably connected in the cavity via a thrust ball bearing. The rotary motor 6 drives the bidirectional lead screw 28 to rotate via a coupling, causing the two movable seats 29 to move in opposite directions along the lead screw. The surface of the bidirectional lead screw 28 is nitrided to improve its wear resistance. When the movable seats 29 move in opposite directions, the clamping block 8 clamps the pipe.
[0023] Please see Figure 6 A further solution based on this embodiment is as follows: a convex rail 31 is fixedly connected to the bottom of the cavity, and a concave block 32 is slidably connected to the convex rail 31. The upper end of the concave block 32 is fixedly connected to the lower end of the movable seat 29, and the concave block 32 and the convex rail 31 form a sliding fit. The upper end of the concave block 32 is fixed to the movable seat 29 by bolts. When the bidirectional lead screw 28 rotates, the concave block 32 slides along the convex rail 31, constraining the movable seat 29 to retain only the horizontal degree of freedom and preventing deviation.
[0024] Please see Figure 1 A further solution based on this embodiment is as follows: A frame 33 is provided at the upper end of the frame 1, and a support roller 34 is rotatably connected to the frame 33. A conical sleeve 35 is fixedly connected to the outer wall of the support roller 34. The support roller 34 is distributed along the long side of the frame 33. The frame 33 is fixed to the frame 1 by bolts. The surface of the frame 33 is painted to improve its corrosion resistance. The support roller 34 is rotatably connected to the frame 33 by a deep groove ball bearing. When the pipe falls into the conical sleeve 35, it rolls into the next process by gravity.
[0025] Working principle: The traction device on the production line transports the stainless steel pipe to be cut to the area of the frame 1 and enters the position of the three-jaw chuck 2. At this time, the hydraulically driven three-jaw chuck 2 starts to clamp the pipe. The built-in pressure sensor monitors the clamping force in real time to ensure stability. At the same time, the rotary motor 6 on the outer wall of the horizontal part of the frame 1 drives the bidirectional lead screw 28 in the cavity to rotate through the coupling. The bidirectional lead screw 28 drives the threaded moving seat 29 to move towards each other along the convex rail 31. The moving seat 29 drives the clamping block 8 (with copper cooling pipe 9 inside) to close synchronously through the column 7 constrained by the slot 30. The displacement sensor provides real-time feedback on the position of the clamping block 8 to ensure that the cutting part is evenly clamped. The cooling pipe 9 is simultaneously circulated with cooling water to reduce the temperature. The U-shaped frame 10 drives the screw 12 to rotate via the servo motor 11. The screw 12 (high-frequency quenched) drives the threaded drive block 13 to move horizontally along the guide rail 14. The support frame 4 connected to the drive block 13 maintains a stable displacement under the constraint of the slider 15 and the guide rail 14. The support plate 16 and support plate 17 welded to the surface of the support frame 4 form a stable support structure. The electric cylinder 18 on the support plate 16 drives the rack 19 to slide along the guide shaft 20. The rack 19 meshes with the flat gear 23 to drive the rotating shaft 22 to rotate. The angle encoder on the rotating frame 21 provides real-time feedback of the tilt angle data. After the PLC calculates the optimal cutting angle based on the pipe diameter, it drives the laser cutting head 5 to adjust to the preset oblique cutting angle. The turntable 3 starts to rotate under the drive of the frame 1, and the laser cutting head 5 with fiber optic transmission structure starts to emit a high-energy laser beam. The synchronous nitrogen tank 26 controls the nitrogen nozzle 25 to spray inert gas into the cutting area through the solenoid valve, which prevents oxidation and blows away molten residue. During the cutting process, the cooling pipe 9 inside the clamping block 8 and the nitrogen purging form a dual temperature control system, which effectively suppresses the generation of the heat-affected zone. After the cutting is completed, the rotary motor 6 drives the bidirectional lead screw 28 in the reverse direction to release the clamping block 8, the turntable 3 stops rotating, and each moving component is reset to its initial position.
[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A cutting device for a stainless steel pipe manufacturing line, comprising a frame (1); characterized in that: A three-jaw chuck (2) for fixing stainless steel pipes is installed on the frame (1). A turntable (3) is also rotatably connected to the frame (1). The turntable (3) is powered by the frame (1) and rotates. A feed assembly is provided on the turntable (3). A support frame (4) is installed at the output end of the feed assembly. A swing assembly is provided on the support frame (4). A laser cutting head (5) for cutting stainless steel pipes is provided at the output end of the swing assembly. The feed assembly is used to adjust the distance between the laser cutting head (5) and the stainless steel pipe. The swing assembly is used to adjust the distance between the laser cutting head (5) and the stainless steel pipe. The angle between the cutting head (5) and the stainless steel pipe, the horizontal part of the frame (1) is provided with a cavity, the outer wall of the horizontal part of the frame (1) is equipped with a rotary motor (6), the cavity is provided with an opening and closing assembly, the opening and closing assembly is driven by the rotary motor (6), the output end of the opening and closing assembly is fixedly connected to a column (7), the upper end of the column (7) is fixedly connected to a clamp (8), the clamp (8) is used to clamp the cutting part of the stainless steel pipe, the clamp (8) is provided with a cooling pipe (9), the inlet and outlet of the cooling pipe (9) are both connected to an external water supply source.
2. The cutting equipment for a stainless steel pipe manufacturing line according to claim 1, characterized in that: The feed assembly includes a U-shaped frame (10) fixedly connected to the turntable (3), a servo motor (11) mounted on the outer wall of the U-shaped frame (10), a screw (12) rotatably connected to the U-shaped frame (10), and a drive block (13) threadedly connected to the screw (12). The surface of the drive block (13) is fixedly connected to the surface of the support frame (4). The output end of the servo motor (11) is connected to one end of the screw (12). The servo motor (11) is used to drive the screw (12) to rotate.
3. The cutting equipment for a stainless steel pipe manufacturing line according to claim 2, characterized in that: A guide rail (14) is fixedly connected to the turntable (3), and a slider (15) is slidably connected to the guide rail (14). The connecting surface of the slider (15) is fixedly connected to the surface of the support frame (4).
4. The cutting equipment for stainless steel pipe manufacturing line according to claim 1, characterized in that: The swing assembly includes a support plate one (16) and a support plate two (17) integrally fixedly connected to the surface of the support frame (4), an electric cylinder (18) mounted on the support plate one (16), a guide shaft (20) fixedly connected to the support plate two (17), a rack (19) mounted on the output end of the electric cylinder (18), a rotating frame (21) fixedly connected to the surface of the support frame (4), a rotating shaft (22) rotatably connected to the rotating frame (21), and a flat gear (23) fixedly connected to the outer wall of the rotating shaft (22). The rack (19) meshes with the flat gear (23), the rack (19) slides with the outer wall of the guide shaft (20), and the outer wall of the rotating shaft (22) is fixedly connected to the laser cutting head (5).
5. The cutting equipment for a stainless steel pipe manufacturing line according to claim 1, characterized in that: A base (24) is fixedly connected to the side wall of the outer shell of the laser cutting head (5). A nitrogen nozzle (25) is installed inside the base (24). A nitrogen tank (26) is installed on the upper end of the outer shell of the laser cutting head (5). The nitrogen nozzle (25) is connected to the nitrogen tank (26) through a hose (27). The nitrogen nozzle (25) faces the cutting area.
6. The cutting equipment for a stainless steel pipe manufacturing line according to claim 1, characterized in that: The opening and closing assembly includes a bidirectional lead screw (28) rotatably connected in the cavity, a movable seat (29) threadedly connected to the bidirectional lead screw (28), and a slot (30) opened on the horizontal surface of the frame (1). The upper end of the movable seat (29) is fixedly connected to the lower end of the column (7), and the column (7) moves in the slot (30) through the movable seat (29). One end of the bidirectional lead screw (28) is connected to the output end of the rotary motor (6), and the rotary motor (6) is used to drive the bidirectional lead screw (28) to rotate.
7. A cutting device for a stainless steel pipe manufacturing line according to claim 6, characterized in that: A convex rail (31) is fixedly connected to the bottom of the cavity, and a concave block (32) is slidably connected on the convex rail (31). The upper end of the concave block (32) is fixedly connected to the lower end of the movable seat (29).
8. A cutting device for a stainless steel pipe manufacturing line according to claim 1, characterized in that: A frame (33) is provided at the upper end of the frame (1), and a support roller (34) is rotatably connected to the frame (33). A conical sleeve (35) is fixedly connected to the outer wall of the support roller (34), and the support roller (34) is distributed along the long side of the frame (33).