Laser cutting equipment for pipe machining and using method thereof

Abstract

The invention relates to the technical field of laser cutting, in particular to laser cutting equipment for pipe machining and a using method thereof.The laser cutting equipment comprises a base, a rack of a C-shaped structure is fixedly arranged on the base, and sliding grooves are formed in the upper side and the lower side of the interior of the rack. According to the laser cutting equipment for pipe machining and the using method thereof, an annular frame is pushed to compress a spring to the tail end of the stroke, at the moment, a one-way bearing enables a first gear to idle, after cutting is completed, the spring resets to drive the first gear to be engaged with a first rack, and the annular frame is driven to rotate by 180 degrees to switch a fixed mode; the follow-up pipe is reversely embedded into the inner wall of the pipe through the fixing elastic piece to be fixed, a two-way fixing mode is formed through positive and negative alternate force application of the two-way fixing switching and deformation compensation mechanism, the compatibility of equipment to different pipe diameters is expanded, more importantly, the fixing elastic piece bears reverse stress under the two working conditions, and the service life of the equipment is prolonged. Residual deformation is counteracted through periodic loads, and the fatigue rate of the elastic piece is obviously delayed.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting, and particularly to a laser cutting device for pipe processing and its usage method. Background Art

[0002] In the field of laser cutting of pipes, automatic clamping and stress balance control are key technical difficulties. In the prior art, conventional fixing devices mostly adopt single-sided outward support or internal expansion modes. For example, the outer wall of the pipe is clamped by elastic claws, or the surface of the pipe is pressed by a hydraulic-driven arc plate. Although such structures can achieve basic positioning, they have the following defects:

[0003] Stress concentration leads to fatigue failure: The fixing spring pieces are prone to cumulative plastic deformation under long-term unidirectional stress, and the cutting vibration accelerates the creep of the material, resulting in a clamping force attenuation rate exceeding 0.5% per thousand operations;

[0004] Limited compatibility: A single fixing mode cannot adapt to pipes with different diameters. In particular, thin-walled pipe fittings are prone to deformation or cracks due to local overpressure;

[0005] Lack of dynamic compensation: The traditional clamping mechanism lacks a real-time deformation cancellation mechanism, and the residual stress causes the spring piece to rebound deviate, affecting the 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 the present 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 above background art. To achieve the above purpose, the present invention provides the following technical solution: A laser cutting device for pipe processing, including a base, on which a C-shaped frame is fixedly arranged, and sliding grooves are opened on both the upper and lower sides inside the frame, and a floating table is slidably connected in the sliding grooves, and springs elastically connected to the floating table are arranged in the sliding grooves.

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

[0009] A pipe support is arranged inside the ring frame, and four connecting rods are annularly arranged on the side surface of the pipe support, and fixing spring pieces for clamping the pipe are obliquely fixed at the ends of the connecting rods.

[0010] Preferably, a through hole penetrating the ring frame is axially formed in the connecting shaft, and an inner pin is rotatably connected in the through hole. One end of the inner pin located outside is rotatably connected with a second gear, and a one-way bearing is also arranged between the second gear and the inner pin. A second rack meshing with the second gear is fixedly arranged in the sliding groove.

[0011] The pipe support is rotatably connected along the ring frame, and a ring groove is formed in the outer circle of the pipe support. A tooth surface is formed on the inner side wall of the ring groove, and a ring gear meshing with the tooth surface is arranged at one end of the inner pin located inside.

[0012] Preferably, the pipe support is of a ring structure, and a notch is formed in the inner groove of the pipe support. A baffle is rotatably arranged in the notch, and the baffle is inclined relative to the fixed elastic piece.

[0013] A clamping jaw cooperating with the fixed elastic piece is formed on the surface of the baffle.

[0014] Preferably, a movable pipe clamp is arranged on the base, and a laser cutter cooperating with the pipe clamp is arranged on the base.

[0015] Preferably, a collision-proof cover is fixedly arranged on the top of the base.

[0016] Preferably, a limiting block cooperating with the baffle is fixedly arranged on the inner circle of the pipe support.

[0017] Preferably, a limiting torsion spring is arranged 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 the pipe into the fixed elastic piece, and then use the laser cutter for cutting.

[0020] S2. When the pipe is inserted into the fixed elastic piece, push the ring frame to compress the spring to the end of the stroke. At this time, the one-way bearing makes the first gear rotate idly. After cutting is completed, the spring resets to drive the first gear to engage with the first rack, driving the ring frame to rotate 180° to switch to the fixed mode. Subsequently, the subsequent pipe is reversely embedded into the inner wall of the pipe through the fixed elastic piece to complete the fixation.

[0021] S3. During forward fixation, the baffle serves as an inclined supporting surface to disperse the impact force of the pipe. When switching to reverse fixation, the pipe pushes the baffle to deflect around the torsion spring, so that the clamping jaw accurately clamps into the fixed elastic piece to form a rigid fulcrum. At this time, the pressure on the outer wall of the pipe is converted into a radial reset force on the elastic piece through the clamping jaw fulcrum, forming a superposition effect with the inherent resilience of the elastic piece, and offsetting the plastic deformation amount caused by pipe extrusion in real time.

[0022] S4. When the floating platform resets, the second gear engages with the second rack, and drives the ring gear through the inner pin to drive the pipe support to rotate self - sufficiently. This movement enables the four groups of fixed elastic pieces to automatically switch their working phases after each operation, ensuring that the upper and lower elastic piece groups alternately bear the main load, avoiding non - uniform creep caused by unilateral stress concentration, and enabling each elastic piece to uniformly participate in the fixing operation circumferentially, eliminating the accumulation of long - term single - point deformation.

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

[0024] In the present invention, when the pushing ring frame compresses the spring to the end of the stroke, the one - way bearing makes the first gear idle. After cutting is completed, the spring resets to drive the first gear to engage with the first rack, driving the ring frame to rotate 180° to switch the fixing mode. Subsequently, the pipe is fixed by the fixed elastic pieces reversely embedded into the inner wall of the pipe. This two - way fixing switching and deformation compensation mechanism forms a two - way fixing mode by applying forces alternately in the positive and negative directions. It not only expands the compatibility of the equipment with different pipe diameters, but more importantly, enables the fixed elastic pieces to bear reverse stresses under two working conditions, offsetting residual deformation through periodic loads, and significantly delaying the fatigue rate of the elastic pieces.

[0025] In the present invention, during positive fixing, the baffle serves as an inclined supporting surface to disperse the impact force of the pipe. When switching to reverse fixing, the pipe pushes the baffle to deflect around the torsion spring, enabling the jaws to precisely engage with the fixed elastic pieces 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 elastic piece through the fulcrum of the jaws, forming a superimposed effect with the inherent resilience of the elastic piece, and dynamically offsetting the plastic deformation caused by pipe extrusion in real - time. This dynamic deformation collaborative compensation system realizes dynamic neutralization of deformation through the linkage of kinematic pairs, ensuring that the elastic pieces always maintain the designed elastic modulus for a long time.

[0026] In the present invention, when the floating platform resets, the second gear engages with the second rack, and drives the ring gear through the inner pin to drive the pipe support to rotate self - sufficiently. This movement enables the four groups of fixed elastic pieces to automatically switch their working phases after each operation, ensuring that the upper and lower elastic piece groups alternately bear the main load, avoiding non - uniform creep caused by unilateral stress concentration, and enabling each elastic piece to uniformly participate in the fixing operation circumferentially, eliminating the accumulation of long - term single - point deformation. This self - adaptive stress - balancing structure realizes wear equalization for periodic position reconstruction, enabling the multi - elastic - piece system to always maintain a collaborative elastic threshold and enhancing the service stability of the fixing system. Brief Description of the Drawings

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

[0028] Figure 2 is a structural schematic diagram of the bench and the ring frame of the present invention;

[0029] Figure 3 is the explosion of the bench and the ring frame of the present invention Figure 1 ;

[0030] Figure 4 For the present invention Figure 3 An enlarged view of location A in the present invention;

[0031] Figure 5 An exploded view of the bench and ring frame of the present invention Figure 2 ;

[0032] Figure 6 For the present invention Figure 5 An enlarged view of location B in the present invention;

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

[0034] Figure 8 For the present invention Figure 7 An enlarged view of location C in the present invention;

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

[0036] Figure 10 A schematic structural view of the pipe support and baffle of the present invention.

[0037] In the figure: 1, base; 2, bench; 3, sliding groove; 4, floating platform; 5, spring; 6, ring frame; 7, connecting shaft; 8, first gear; 9, one-way bearing; 10, first rack; 11, pipe support; 12, connecting rod; 13, fixed elastic piece; 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 manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to 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 bench 2 is fixedly arranged on the base 1, and sliding grooves 3 are respectively opened on the upper and lower sides inside the bench 2, and a floating platform 4 is slidably connected in the sliding grooves 3. The floating platform 4 is made of a high-damping alloy material, and an anti-slip pattern is provided on the contact surface between its bottom and the sliding groove 3, so as to ensure that the floating platform 4 will only move when the pipe support 11 is pushed by the pipe, and avoid unnecessary movement of the floating platform 4. A spring 5 elastically connected to the floating platform 4 is arranged in the sliding groove 3.

[0040] A ring frame 6 is arranged inside the bench 2, and connecting shafts 7 are fixedly connected to both the upper and lower sides of the ring frame 6. The connecting shafts 7 are rotatably inserted into the floating platform 4, and the ends of the connecting shafts 7 are rotatably connected to first gears 8. A one-way bearing 9 is arranged between the first gears 8 and the connecting shafts 7. A first rack 10 that cooperates with the first gears 8 is fixedly arranged in the chute 3, and the first gears 8 and the connecting shafts 7 form a one-way drive through the second one-way bearing 9.

[0041] A pipe support 11 is arranged inside the ring frame 6, and four connecting rods 12 are annularly arrayed on the side surface of the pipe support 11. Fixing elastic pieces 13 for clamping pipes are obliquely fixed at the ends of the connecting rods 12. The four obliquely fixed elastic pieces 13 form a conical clamping space, which can adaptively clamp pipes with different ovalities.

[0042] In this embodiment, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 shown, a through hole 14 penetrating the ring frame 6 is axially formed in the connecting shaft 7, and an inner pin 15 is rotatably connected in the through hole 14. A magnetic sealing ring is arranged in the through hole 14, which can not only ensure the smooth rotation of the inner pin 15 but also prevent cutting debris from invading. One end of the inner pin 15 located outside is rotatably connected to a second gear 16, and a one-way bearing 9 is also arranged between the second gear 16 and the inner pin 15. A second rack 17 that meshes with the second gear 16 is fixedly arranged in the chute 3.

[0043] The pipe support 11 is rotatably connected along the ring frame 6, and an annular groove 18 is formed in the outer ring of the pipe support 11. A tooth surface 19 is formed on the inner side wall of the annular groove 18, and an annular tooth 20 that meshes with the tooth surface 19 is arranged at one end of the inner pin 15 located inside.

[0044] In this embodiment, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 shown, the pipe support 11 is set as an annular structure, and a notch 21 is formed in the inner groove of the pipe support 11. A baffle 22 is rotatably arranged in the notch 21, and the baffle 22 is obliquely arranged opposite to the fixing elastic piece 13. The initial inclination angle of the baffle 22 is 30° - 45°.

[0045] Jaws 23 that cooperate with the fixing elastic pieces 13 are formed on the surface of the baffle 22. When the baffle 22 deflects around the torsion spring, the jaws 23 can accurately be inserted into the fixing elastic pieces 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 cooperating with the pipe clamp is provided on the base 1. The pipe clamp includes a pneumatic quick-change module, which can be compatible with three chuck forms: V-shaped, flat, and three-jaw. The laser cutter is equipped with a vision positioning system, and its focusing lens is provided with an adaptive focal length adjustment mechanism, which can compensate for the radial runout of the pipe in real time. A precision guide rail system driven by a linear motor is integrated on the base 1, and the positioning repeat accuracy reaches ±0.01 mm, 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-proof cover is fixedly provided on the top of the base 1. The collision-proof cover adopts a three-layer composite structure. The inner layer is made of high-temperature resistant ceramic fiber, the middle layer is an electromagnetic shielding net, and the outer layer is explosion-proof polycarbonate. An air curtain protection device is provided at the front of the cover body, forming a directional air flow of 0.3 m / s during operation, which not only discharges cutting dust but also keeps the observation field of view clear. A photoelectric induction device is provided at the bottom edge, automatically triggering 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, a limit block cooperating with the baffle 22 is fixedly provided on the inner circle of the pipe support 11. The limit block is fixed on the inner circle of the pipe support 11, and the maximum opening and closing angle range of the baffle 22 is limited by a mechanical blocking method. A graphite self-lubricating layer is provided on the contact surface to reduce the friction coefficient between the baffle 22 and the limit block, ensuring that the movement accuracy is still maintained after ten thousand times of opening and closing.

[0049] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, a limiting torsion spring is provided at the connection between the baffle 22 and the notch 21. The torsion spring is made of fatigue-resistant spring 5 steel and is nitrided on the surface. An angle encoder is provided at the connection to monitor the opening and closing angle of the baffle 22 in real time and feedback it to the control system. A micro temperature sensor is integrated on the axis of the torsion spring to achieve 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 fixed elastic piece 13, and then use the laser cutter for cutting.

[0052] S2. When the pipe is inserted into the fixed spring piece 13, the pushing ring frame 6 compresses the spring 5 to the end of the stroke. At this time, the one-way bearing 9 makes the first gear 8 rotate idly. After cutting is completed, the spring 5 resets to drive the first gear 8 to engage with the first rack 10, driving the ring frame 6 to rotate 180° to switch to the fixed mode. Subsequently, the pipe is reversely embedded into the inner wall of the pipe through the fixed spring piece 13 to complete the fixation.

[0053] S3. During forward fixation, the baffle 22 serves as an inclined supporting surface to disperse the impact force of the pipe. When switching to reverse fixation, the pipe pushes the baffle 22 to deflect around the torsion spring, enabling the jaws 23 to accurately engage with the fixed spring piece 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 piece through the fulcrum of the jaws 23, forming a superposition effect with the inherent restoring force of the spring piece to offset the plastic deformation caused by pipe extrusion in real time.

[0054] S4. When the floating platform 4 resets, the second gear 16 engages with the second rack 17, driving the ring gear 20 through the inner pin 15 to drive the pipe support 11 to rotate self - sufficiently. This movement enables the four groups of fixed spring pieces 13 to automatically switch the working phase after each operation, ensuring that the upper and lower spring piece groups alternately bear the main load, avoiding non - uniform creep caused by unilateral stress concentration, and enabling each spring piece to uniformly participate in the fixation operation in the circumferential direction to eliminate the accumulation of long - term single - point deformation.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above - mentioned embodiments. The above - mentioned embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by 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 arranged on the base (1). Both the upper and lower sides inside the frame (2) are provided with sliding grooves (3), and a floating platform (4) is slidably connected in the sliding grooves (3). A spring (5) elastically connected to the floating platform (4) is arranged in the sliding grooves (3). A ring frame (6) is arranged inside the frame (2). Both 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). A first gear (8) is rotatably connected to the end of the connecting shaft (7). A one-way bearing (9) is arranged between the first gear (8) and the connecting shaft (7). A first rack (10) matched with the first gear (8) is fixedly arranged in the sliding groove (3). A pipe support (11) is arranged inside the ring frame (6). Four connecting rods (12) are annularly arrayed on the side surface of the pipe support (11). A fixing elastic sheet (13) for clamping a pipe is obliquely fixed at the end of the connecting rod (12).

2. The laser cutting device for pipe processing according to claim 1, characterized in that: A through hole (14) penetrating the ring frame (6) is axially opened in the connecting shaft (7). An inner pin (15) is rotatably connected in the through hole (14). A second gear (16) is rotatably connected to the end of the inner pin (15) located outside. A one-way bearing (9) is also arranged between the second gear (16) and the inner pin (15). A second rack (17) meshed with the second gear (16) is fixedly arranged in the sliding groove (3). The pipe support (11) is rotatably connected along the ring frame (6). A ring groove (18) is opened on the outer ring of the pipe support (11). A tooth surface (19) is opened on the inner side wall of the ring groove (18). A ring tooth (20) meshed with the tooth surface (19) is arranged at the end of the inner pin (15) located inside.

3. A laser cutting device for pipe processing according to claim 2, characterized in that: The pipe support (11) is of a ring structure. A notch (21) is opened in the inner groove of the pipe support (11). A baffle (22) is rotatably arranged in the notch (21). The baffle (22) is obliquely arranged opposite to the fixing elastic sheet (13). A clamping jaw (23) matched with the fixing elastic sheet (13) is opened on the surface of the baffle (22).

4. A laser cutting device for pipe processing according to claim 1, characterized in that: A movable pipe clamp is arranged on the base (1), and a laser cutter matched with the pipe clamp is arranged on the base (1).

5. A laser cutting device for pipe processing according to claim 2, characterized in that: A collision-proof cover is fixedly arranged on the top of the base (1).

6. The laser cutting device for pipe processing according to claim 3, characterized in that: A limit block matched with the baffle (22) is fixedly arranged on the inner ring of the pipe support (11).

7. A laser cutting device for pipe processing according to claim 3, characterized in that: A torsion spring for limiting is arranged at the connection between the baffle (22) and the notch (21).

8. A method of using a laser cutting device for pipe processing, which uses a laser cutting device for pipe processing as described in claim 3, characterized in that, It includes the following steps: S1. After the pipe clamp fixes the pipe, one end of the pipe is pushed and inserted into the fixing elastic sheet (13), and then it is cut by the laser cutter. S2. When the pipe is inserted into the fixing elastic sheet (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) makes the first gear (8) rotate idly. After cutting is completed, the spring (5) resets to drive the first gear (8) to engage with the first rack (10), driving the ring frame (6) to rotate 180° to switch the fixing mode. Subsequently, the pipe is reversely embedded into the inner wall of the pipe through the fixing elastic sheet (13) to complete the fixing. S3. When fixed in the forward direction, the baffle (22) serves as an inclined supporting surface to disperse the impact force of the pipe. When switched to reverse fixation, the pipe pushes the baffle (22) to deflect around the torsion spring, causing the jaw (23) to precisely engage with the fixed spring plate (13) to form a rigid fulcrum. At this time, the external wall pressure of the pipe is converted into a radial restoring force on the spring plate through the fulcrum of the jaw (23), forming a superposition effect with the inherent resilience of the spring plate to offset the plastic deformation caused by pipe extrusion in real time; S4. When the floating platform (4) resets, the second gear (16) meshes with the second rack (17), driving the ring gear (20) through the inner pin (15) to drive the pipe support (11) to rotate. This movement enables the four groups of fixed spring plates (13) to automatically switch the working phase after each operation, ensuring that the upper and lower spring plate groups alternately bear the main load, avoiding non-uniform creep caused by unilateral stress concentration, and enabling each spring plate to uniformly participate in the fixation operation circumferentially to eliminate the accumulation of long-term single-point deformation.

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