A laser cutting apparatus for pipe machining and method of use thereof

Abstract

The application relates to the technical field of laser cutting, in particular to a laser cutting equipment for pipe machining and a using method thereof, which comprises a base, a C-shaped gantry is fixedly arranged on the base, and sliding grooves are arranged on the upper and lower sides in the gantry. The laser cutting equipment for pipe machining and the using method thereof are characterized in that the compression spring of the ring frame is pushed to the end of the stroke, at this time, the one-way bearing makes the first gear idle, after the cutting is completed, the spring resets to drive the first gear to engage the first rack, drives the ring frame to rotate 180 DEG to switch the fixed mode, and the subsequent pipe is fixed by being reversely embedded into the inner wall of the pipe through the fixed spring sheet, the bidirectional fixing switching and the deformation compensation mechanism form the bidirectional fixed mode through positive and negative alternating force, not only the compatibility of the equipment for different pipe diameters is expanded, but more importantly, the fixed spring sheet bears the reverse stress under the two working conditions, the periodic load offsets the residual deformation, and the spring fatigue rate is significantly slowed down.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, specifically to a laser cutting device for pipe processing and its usage method. Background Technology

[0002] In the field of laser cutting of tubes, automated clamping and stress equalization control are key technical challenges. Existing technologies typically employ unidirectional external support or internal expansion mechanisms for fixing devices, such as using elastic jaws to clamp the outer wall of the tube or utilizing hydraulically driven curved plates to press against the tube surface. While these structures can achieve basic positioning, they suffer from the following drawbacks:

[0003] Stress concentration leads to fatigue failure: Long-term unidirectional stress on the fixed spring can easily lead to the accumulation of plastic deformation, and cutting vibration accelerates material creep, resulting in a clamping force attenuation rate of more than 0.5% / thousand cycles.

[0004] Limited compatibility: A single fixed mode cannot adapt to pipes of different diameters, especially thin-walled pipes, which are prone to deformation or cracking due to local overpressure;

[0005] Lack of dynamic compensation: Traditional clamping mechanisms lack a real-time deformation offsetting mechanism, and residual stress causes the spring to rebound and deviate, affecting cutting accuracy.

[0006] In view of this, we propose a laser cutting device for pipe processing and its usage method. Summary of the Invention

[0007] The purpose of this invention is to provide a laser cutting device for pipe processing and its usage method, to solve the problems of stress concentration leading to fatigue failure, limited compatibility, and lack of dynamic compensation mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: a laser cutting device for pipe processing, including a base, on which a C-shaped frame is fixedly mounted, and sliding grooves are provided on both the upper and lower sides inside the frame, with a floating platform slidably connected in the sliding grooves, and a spring elastically connected to the floating platform is provided in the sliding grooves.

[0008] The platform is equipped with a ring frame, and the upper and lower sides of the ring frame are fixedly connected to connecting shafts. The connecting shafts are rotatably inserted into the floating platform, and the end of the connecting shaft is rotatably connected to a first gear. A one-way bearing is provided between the first gear and the connecting shaft. A first rack that cooperates with the first gear is fixedly provided in the sliding groove.

[0009] The ring frame is provided with a pipe support, and the side surface of the pipe support has four connecting rods arranged in a ring. The ends of the connecting rods are fixed with fixing springs for clamping the pipe.

[0010] Preferably, the connecting shaft has a through hole through the ring frame along the axial direction, and an inner pin is rotatably connected in the through hole. The outer end of the inner pin is rotatably connected to a second gear, and a one-way bearing is also provided between the second gear and the inner pin. A second rack that meshes with the second gear is fixedly provided in the slide groove.

[0011] The tube support is rotatably connected along the ring frame, and the outer ring of the tube support is provided with an annular groove. The inner sidewall of the annular groove is provided with a toothed surface, and the inner end of the inner pin is provided with an annular tooth that meshes with the toothed surface.

[0012] Preferably, the tube support is configured as an annular structure, and the inner groove of the tube support has a notch, and a baffle is rotatably arranged in the notch, and the baffle is inclined relative to the fixing spring.

[0013] The surface of the baffle is provided with jaws that cooperate with the fixing spring.

[0014] Preferably, the base is provided with a movable pipe clamp, and the base is also provided with a laser cutter that cooperates with the pipe clamp.

[0015] Preferably, a shock absorber is fixedly provided on the top of the base.

[0016] Preferably, the inner ring of the tube support is fixedly provided with a limiting block that cooperates with the baffle.

[0017] Preferably, a torsion spring with a limit setting is provided at the connection between the baffle and the notch.

[0018] A method for using a laser cutting device for pipe processing includes the following steps:

[0019] S1. After the pipe clamp fixes the pipe, push one end of it into the fixing spring, and then use a laser cutter to cut it.

[0020] S2. When the pipe is inserted into the fixing spring, the ring frame is pushed to the end of the stroke to compress the spring. At this time, the one-way bearing makes the first gear idle. After the cutting is completed, the spring returns to its original position and drives the first gear to mesh with the first rack, which drives the ring frame to rotate 180° to switch the fixing mode. The subsequent pipe is fixed by being embedded into the inner wall of the pipe in the opposite direction through the fixing spring.

[0021] S3. When fixed in the forward direction, the baffle acts as an inclined support surface to disperse the impact force of the pipe. When switched to reverse fixing, the pipe pushes the baffle to deflect around the torsion spring, so that the jaws can accurately engage the fixing spring to form a rigid fulcrum. At this time, the pressure on the outer wall of the pipe is converted into a radial restoring force on the spring through the jaw fulcrum. This force, together with the inherent elastic force of the spring, forms a superposition effect, which in real time offsets the amount of plastic deformation caused by the extrusion of the pipe.

[0022] S4. When the floating platform is reset, the second gear meshes with the second rack, and the inner pin drives the ring tooth to rotate the tube support. This movement causes the four sets of fixed springs to automatically switch working phases after each operation, ensuring that the upper and lower spring groups alternately bear the main load, avoiding non-uniform creep caused by stress concentration on one side, and making each spring uniformly participate in the fixing operation in the circumferential direction, eliminating long-term single-point deformation accumulation.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In this invention, the ring frame is pushed to compress the spring to the end of its stroke. At this time, the one-way bearing causes the first gear to idle. After the cutting is completed, the spring returns to its original position and drives the first gear to mesh with the first rack, causing the ring frame to rotate 180° to switch the fixing mode. Subsequently, the pipe is fixed by the fixing spring being embedded in the inner wall of the pipe in the opposite direction. This bidirectional fixing switching and deformation compensation mechanism forms a bidirectional fixing mode by applying force in both directions. This not only expands the compatibility of the equipment with different pipe diameters, but more importantly, it allows the fixing spring to bear reverse stress under two working conditions. The residual deformation is offset by periodic load, which significantly slows down the fatigue rate of the spring.

[0025] In this invention, when fixed in the forward direction, the baffle acts as an inclined support surface to disperse the impact force of the pipe. When switched to reverse fixing, the pipe pushes the baffle to deflect around the torsion spring, so that the jaws accurately engage with the fixing spring to form a rigid fulcrum. At this time, the pressure on the outer wall of the pipe is converted into a radial restoring force on the spring through the jaw fulcrum, which forms a superposition effect with the inherent elastic force of the spring, and offsets the amount of plastic deformation caused by the extrusion of the pipe in real time. This dynamic deformation collaborative compensation system achieves dynamic neutralization of deformation through the linkage of kinematic pairs, ensuring that the spring maintains the designed elastic modulus for a long time.

[0026] In this invention, when the floating platform is reset, the second gear meshes with the second rack, and the inner pin drives the ring tooth to rotate the tube support. This movement causes the four sets of fixed springs to automatically switch working phases after each operation, ensuring that the upper and lower spring groups alternately bear the main load, avoiding non-uniform creep caused by stress concentration on one side, and making each spring participate in the fixing operation evenly in the circumferential direction, eliminating long-term single-point deformation accumulation. This adaptive stress balancing structure realizes wear equalization through periodic position reconstruction, so that the multi-spring system always maintains the cooperative elastic threshold and improves the service stability of the fixing system. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the test stand and ring frame of the present invention;

[0029] Figure 3 Explosion of the test stand and ring frame of this invention Figure 1 ;

[0030] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 Explosion of the test stand and ring frame of this invention Figure 2 ;

[0032] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0033] Figure 7 This is an exploded view of the ring frame and pipe support of the present invention;

[0034] Figure 8 For the present invention Figure 7 Enlarged view of point C in the middle;

[0035] Figure 9 This is an exploded view of the floating platform and connecting shaft of the present invention;

[0036] Figure 10 This is a schematic diagram of the pipe support and baffle of the present invention.

[0037] In the diagram: 1. Base; 2. Platform; 3. Slide groove; 4. Floating platform; 5. Spring; 6. Ring frame; 7. Connecting shaft; 8. First gear; 9. One-way bearing; 10. First rack; 11. Tube support; 12. Connecting rod; 13. Fixing spring; 14. Through hole; 15. Inner pin; 16. Second gear; 17. Second rack; 18. Ring groove; 19. Tooth surface; 20. Ring tooth; 21. Notch; 22. Baffle; 23. Jaw. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1 to 10 The present invention provides a technical solution: a laser cutting device for pipe processing, including a base 1, a C-shaped frame 2 fixedly mounted on the base 1, and sliding grooves 3 on both the upper and lower sides of the frame 2, with a floating platform 4 slidably connected in the sliding grooves 3. The floating platform 4 is made of high-damping alloy material, and its bottom contact surface with the sliding groove 3 is provided with anti-slip texture, so as to ensure that the floating platform 4 will only move when the pipe support 11 is pushed by the pipe, avoiding unnecessary movement of the floating platform 4. A spring 5 elastically connected to the floating platform 4 is provided in the sliding groove 3.

[0040] A ring frame 6 is provided inside the frame 2, and a connecting shaft 7 is fixedly connected to both the upper and lower sides of the ring frame 6. The connecting shaft 7 is rotatably inserted into the floating platform 4, and a first gear 8 is rotatably connected to the end of the connecting shaft 7. A one-way bearing 9 is provided between the first gear 8 and the connecting shaft 7. A first rack 10 that cooperates with the first gear 8 is fixedly provided in the slide groove 3. The first gear 8 and the connecting shaft 7 form a one-way transmission through the second one-way bearing 9.

[0041] The ring frame 6 is provided with a pipe support 11, and the side surface of the pipe support 11 has four connecting rods 12 arranged in a ring. The ends of the connecting rods 12 are fixed with fixed spring pieces 13 for clamping the pipe. The four inclined fixed spring pieces 13 form a conical clamping space, which can adapt to the clamping of pipes with different ellipticity.

[0042] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the connecting shaft 7 has a through hole 14 that passes through the ring frame 6 along the axial direction, and an inner pin 15 is rotatably connected in the through hole 14. A magnetic sealing ring is installed in the through hole 14 to ensure smooth rotation of the inner pin 15 and prevent cutting debris from entering. The outer end of the inner pin 15 is rotatably connected to a second gear 16, and a one-way bearing 9 is also provided between the second gear 16 and the inner pin 15. A second rack 17 that meshes with the second gear 16 is fixedly installed in the slide groove 3.

[0043] The tube support 11 is rotatably connected along the ring frame 6, and the outer ring of the tube support 11 is provided with an annular groove 18. The inner side wall of the annular groove 18 is provided with a toothed surface 19, and the inner pin 15 is provided with an annular tooth 20 that meshes with the toothed surface 19 at one end.

[0044] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the tube support 11 is designed as an annular structure, and the inner groove of the tube support 11 has a notch 21. A baffle 22 is rotatably arranged inside the notch 21, and the baffle 22 is inclined relative to the fixed spring piece 13. The initial tilt angle of the baffle 22 is 30°-45°.

[0045] The surface of the baffle 22 is provided with jaws 23 that cooperate with the fixed spring 13. When the baffle 22 deflects around the torsion spring, the jaws 23 can be precisely engaged with the fixed spring 13 to form a rigid fulcrum.

[0046] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10As shown, a movable pipe clamp is provided on the base 1, and a laser cutter that cooperates with the pipe clamp is also provided on the base 1. The pipe clamp includes a pneumatic quick-change module, which is compatible with V-shaped, flat and three-jaw clamps. The laser cutter is equipped with a vision positioning system, and its focusing lens has an adaptive focal length adjustment mechanism, which can compensate for the radial runout of the pipe in real time. The base 1 integrates a precision guide rail system driven by a linear motor, with a positioning repeatability of ±0.01mm, realizing multi-station continuous processing.

[0047] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, a collision shield is fixedly installed on the top of the base 1. The collision shield adopts a three-layer composite structure. The inner layer is high-temperature resistant ceramic fiber, the middle layer is an electromagnetic shielding mesh, and the outer layer is explosion-proof polycarbonate. An air curtain protection device is provided at the front of the shield. When working, it forms a directional airflow of 0.3m / s, which not only exhausts cutting fumes but also maintains a clear field of vision. A photoelectric sensor is provided at the bottom edge, which automatically triggers an emergency stop when a foreign object enters the working area.

[0048] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the inner ring of the tube support 11 is fixedly provided with a limiting block that cooperates with the baffle 22. The limiting block is fixed to the inner ring of the tube support 11 and limits the maximum opening and closing angle range of the baffle 22 by mechanical blocking. The contact surface is provided with a graphite self-lubricating layer to reduce the friction coefficient between the baffle 22 and the limiting block and ensure that the movement accuracy is maintained after 10,000 opening and closing cycles.

[0049] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, a limit torsion spring is provided at the connection between the baffle 22 and the notch 21. The torsion spring is made of fatigue-resistant spring steel and its surface is nitrided. An angle encoder is provided at the connection to monitor the opening and closing angle of the baffle 22 in real time and feed it back to the control system. A miniature temperature sensor is integrated into the shaft of the torsion spring to realize the overheat protection function.

[0050] A method for using a laser cutting device for pipe processing includes the following steps:

[0051] S1. After the pipe clamp fixes the pipe, push one end of it into the fixing spring 13, and then use a laser cutter to cut it.

[0052] S2. When the pipe is inserted into the fixing spring 13, the ring frame 6 is pushed to compress the spring 5 to the end of the stroke. At this time, the one-way bearing 9 causes the first gear 8 to rotate freely. After the cutting is completed, the spring 5 resets and drives the first gear 8 to mesh with the first rack 10, which drives the ring frame 6 to rotate 180° to switch the fixing mode. Subsequently, the pipe is fixed by being embedded in the inner wall of the pipe in the opposite direction through the fixing spring 13.

[0053] S3. When fixed in the forward direction, the baffle 22 acts as an inclined support surface to disperse the impact force of the pipe. When switched to reverse fixing, the pipe pushes the baffle 22 to deflect around the torsion spring, so that the jaws 23 are precisely engaged with the fixing spring 13 to form a rigid fulcrum. At this time, the pressure on the outer wall of the pipe is converted into a radial restoring force on the spring through the fulcrum of the jaws 23, which forms a superposition effect with the inherent elastic force of the spring, and offsets the amount of plastic deformation caused by the extrusion of the pipe in real time.

[0054] When S4 and floating platform 4 are reset, the second gear 16 meshes with the second rack 17, and drives the ring tooth 20 to rotate the tube support 11 through the inner pin 15. This movement causes the four sets of fixed spring pieces 13 to automatically switch working phases after each operation, ensuring that the upper and lower spring piece groups alternately bear the main load, avoiding non-uniform creep caused by stress concentration on one side, and making each spring piece participate in the fixing operation evenly in the circumferential direction, eliminating long-term single-point deformation accumulation.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser cutting device for pipe processing, comprising a base (1), characterized in that: A C-shaped frame (2) is fixedly installed on the base (1), and a sliding groove (3) is provided on both the upper and lower sides inside the frame (2), and a floating platform (4) is slidably connected in the sliding groove (3), and a spring (5) is elastically connected to the floating platform (4) in the sliding groove (3). The frame (2) is provided with a ring frame (6), and the upper and lower sides of the ring frame (6) are fixedly connected with connecting shafts (7). The connecting shafts (7) are rotatably inserted into the floating platform (4), and the end of the connecting shafts (7) is rotatably connected with a first gear (8). A one-way bearing (9) is provided between the first gear (8) and the connecting shaft (7). A first rack (10) that cooperates with the first gear (8) is fixedly provided in the slide groove (3). The ring frame (6) is provided with a pipe support (11), and the side surface of the pipe support (11) is arranged with four connecting rods (12) in a ring. The end of the connecting rod (12) is fixed with a fixing spring (13) for clamping the pipe. The connecting shaft (7) has a through hole (14) through the ring frame (6) along the axial direction, and an inner pin (15) is rotatably connected in the through hole (14). The inner pin (15) is rotatably connected to a second gear (16) at one end located on the outside, and a one-way bearing (9) is also provided between the second gear (16) and the inner pin (15). A second rack (17) that meshes with the second gear (16) is fixedly provided in the groove (3). The tube support (11) is rotatably connected along the ring frame (6), and the outer ring of the tube support (11) is provided with an annular groove (18), and the inner side wall of the annular groove (18) is provided with a toothed surface (19). The inner pin (15) is provided with a ring tooth (20) that meshes with the toothed surface (19) at one end inside. The tube support (11) is designed as an annular structure, and the inner groove of the tube support (11) is provided with a notch (21). A baffle (22) is rotatably arranged inside the notch (21), and the baffle (22) is designed to be inclined relative to the fixed spring piece (13). The surface of the baffle (22) is provided with jaws (23) that cooperate with the fixing spring (13); A torsion spring with a limit position is provided at the connection between the baffle (22) and the notch (21).

2. The laser cutting equipment for pipe processing according to claim 1, characterized in that: The base (1) is provided with a movable pipe clamp, and the base (1) is provided with a laser cutter that cooperates with the pipe clamp.

3. The laser cutting equipment for pipe processing according to claim 2, characterized in that: A crash shield is fixedly installed on the top of the base (1).

4. The laser cutting equipment for pipe processing according to claim 3, characterized in that: The inner ring of the tube support (11) is fixedly provided with a limiting block that cooperates with the baffle (22).

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