Laser coil splicing device, coil splicing process

Abstract

The present invention discloses a laser coil splicing device and a coil splicing process. The laser coil splicing device of the present invention comprises: a movable slide, on which a rotatable cutter and a rotatable tape roll are arranged. Two lifting cylinders connected to the cutter fixing seat and the tape fixing seat are also respectively arranged on the bottom plate, and the push rods of the lifting cylinders pass through the through holes arranged on the top plate, and respectively drive the cutter and the tape to rise and fall. The laser coil splicing device of the present invention comprises a coil splicing mechanism, and a laser welding mechanism for welding the edges of two spliced ​​coils. The laser coil splicing device of the present invention can effectively improve the splicing efficiency of coils, and the coils after the coil splicing process have strong tensile strength, small step difference at the splicing edge, and longer service life.

Description

Technical Field

[0001] The invention relates to a laser coil splicing device and a coil material splicing process. Background Art

[0002] Lasers are characterized by high brightness, high directionality, and high monochromaticity, and are widely used in a variety of fields. By adjusting the energy power of the laser pulse, the wavelength range of the laser beam, the width of the laser beam and other parameters, the laser energy is converted into thermal energy, and then the workpiece is melted by heat conduction to form a specific molten pool, thereby forming a tight welding area. The pull-out strength of the weld zone produced by the laser welding process often exceeds the strength of the raw material itself. Compared with other welding processes, the laser welding process can greatly reduce the vibration stress and thermal stress of the workpiece, and has the advantages of high welding strength, small welding gap connection step difference, short welding time, and long workpiece welding life.

[0003] The mass production materials involved in manufacturing are often supplied in the form of rolls. Therefore, during processing and production, the rolls often need to be spliced. When splicing, it is usually necessary to cut the edges of the rolls and then splice them at an appropriate splicing angle. Currently, the most commonly used splicing method is to use ordinary adhesive tape for manual splicing. However, the manual splicing method has low splicing strength, large splicing gap connection section difference, and long splicing time, which affects the production yield and efficiency during the splicing process of the rolls, and is prone to breakage at the splicing. Summary of the invention

[0004] In order to overcome the above disadvantages, the purpose of the present invention is to provide a coil splicing mechanism and a laser coil splicing device including the same. The laser coil splicing device of the present invention can effectively improve the splicing efficiency of coils, and the coils after the coil splicing process have strong tensile strength, small coil edge step difference, and longer service life.

[0005] The coiled material splicing mechanism of the present invention is used for splicing the edges of coiled materials, and comprises: at least one cutter for cutting the edges of two coiled materials to be spliced;

[0006] Adhesive tape is used to connect the adjacent edges of two coils after cutting;

[0007] A movable slide, the cutter and the adhesive tape are arranged on the movable slide, the cutter and the adhesive tape can move relative to the movable slide, and the coil can be cut and the adhesive tape can be pasted when the movable slide moves;

[0008] The slide table is slidably connected with the movable slide seat, and the movable slide seat can slide on the slide table. The coiled material splicing mechanism of the present invention is provided with a cutter and an adhesive tape on the movable slide seat, so that the edges of the coiled materials can be cut and trimmed by moving the movable slide seat along the edges of the coiled materials to be spliced, and after the cutting is completed, the adhesive tape can be quickly spliced ​​between the edges of the two coiled materials to connect the coiled materials, thereby improving the splicing efficiency of the coiled materials.

[0009] Furthermore, the invention also comprises a coil fixing mechanism for fixing the position of the coil, wherein the coil fixing mechanism can fix the edges of the two coils to a position above the cutter. Thus, the position of the coil can be fixed by the coil fixing mechanism, which is convenient for cutting.

[0010] Furthermore, the coil fixing mechanism includes a moving part respectively arranged corresponding to the end of each coil, and the moving parts corresponding to the two coils can move in opposite directions, and the moving part includes a support plate and a fixed plate, and a coil accommodating gap for the coil to pass freely is arranged between the fixed plate and the support plate. Therefore, the moving part can drive the two coils to move in a direction close to each other, and the support plate and the fixed plate are arranged oppositely, and a gap for the coil output is left between the two, thereby guiding the coil output.

[0011] Furthermore, the edges of the two fixing plates arranged corresponding to the ends of the two rolls of coils can abut against each other. When the edges of the two fixing plates abut against each other, an operating gap is formed between the two support plates for the cutter and the tape to enter.

[0012] Furthermore, the fixing plate is rotatably connected to the supporting plate, and the fixing plate can be pressed onto the upper surface of the supporting plate.

[0013] Furthermore, it also includes a pressure strip that can move toward or away from the support plate, and the pressure strip can be pressed onto the upper surface of the support plate.

[0014] Furthermore, the cutter is arranged on a liftable cutter fixing seat, the cutter fixing seat comprises a fixed plate and a movable plate arranged opposite to each other, and also comprises a rotating shaft arranged perpendicular to the fixed plate and the movable plate, the cutter is arranged on the rotating shaft, and the movable plate is detachably connected to the body of the cutter fixing seat. Therefore, when the cutter needs to be repaired or replaced, the movable plate can be detached from the body of the cutter fixing seat.

[0015] The present invention also provides a laser coil splicing device, which includes the aforementioned coil splicing mechanism, the movable slide can be slidably arranged on the machine table, the tape is a laser tape, and also includes a laser welding mechanism, the laser welding mechanism includes a laser head that can move along the edge of the coil to be spliced. The laser coil splicing device of the present invention can realize the cutting of the coil and the sticking of the tape by moving the movable slide, and then the laser head moves along the length direction of the cutting part to realize the rapid welding and splicing of the coil, and the laser tape is pasted on the edge of the coil to be spliced ​​by using the movable slide, and the laser tape is irradiated by using the laser head, so that a tight welding area is formed between the edges of the two coils, and the welding effect is good.

[0016] The present invention also provides a coiled material splicing process, which comprises the following steps:

[0017] After the edges of the two rolls of material are overlapped, the position of the rolls is fixed;

[0018] In the overlapping area of ​​the coils, cutting is performed along the edges of the coils to be glued. After cutting, the distance between the edges of the two coils is a;

[0019] The edges of the two cut coils are connected to each other using laser tape, wherein the width of the laser tape is b, and b>a; the laser tape can be set on any one side or both sides of the coil;

[0020] The area between the edges of the two webs is irradiated with a moving laser beam.

[0021] Furthermore, the laser tape is provided on at least one side of the coil, and the ratio of b to a is 5:1-25:1. The coiling process of the present invention can effectively reduce the step difference of the coiling edge, and the surface of the connection is flat, and the firmness and service life of the connected coil are higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the connection relationship between the cutter and the cutter fixing seat according to the first embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the coil fixing mechanism according to the first embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the position relationship of the coil fixing mechanism before coil cutting according to the first embodiment of the present invention;

[0026] Figure 5It is a three-dimensional structural schematic diagram of another implementation manner of the coil fixing mechanism of the first embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the connection relationship of the pressure strips of another implementation manner of the coil fixing mechanism of the first embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the position relationship of the coil fixing mechanism before the coil cutting according to another implementation of the coil fixing mechanism of the first embodiment of the present invention;

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of Example 2 of the present invention.

[0030] In the figure:

[0031] 1. Moving slide; 11. Bottom plate; 12. Top plate; 2. Cutter; 21. Cutter fixing seat; 211. Fixing plate; 212. Moving plate; 22. Annular blade; 3. Tape roll; 31. Tape fixing seat; 41. Screw rod; 42. Driving motor; 43. Machine table; 431. Slide rail; 5. Lifting cylinder; 61. First clamping plate; 62. Second clamping plate; 71. Fiber laser; 72. Fiber laser source; 73. Focusing lens; 81. First translation cylinder; 82. Second translation cylinder; 9. Vertical plate; 91. Slide; 10. Conveying roller; 13. Coil fixing mechanism; 131. Support plate; 132. Fixing plate; 133. Pressure strip; 134. Connecting rod; 135. Clamping block; 136. Fixed edge. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0033] Embodiment 1:

[0034] This embodiment is a coiled material splicing mechanism, which is used to splice two coiled materials, and includes:

[0035] A movable slide 1 is provided with a rotatable cutter 2 and a rotatable tape roll 3. An internal threaded sleeve is provided on the movable slide 1, and the movable slide 1 also includes a screw 41 matched with the internal threaded sleeve, a driving motor 42 for driving the screw 41 to rotate, and a machine table 43 slidably connected with the movable slide 1. In some embodiments of the present invention, a slider can be provided at the bottom of the movable slide 1, and a slide rail 431 matched with the slider can be provided on the machine table 43.

[0036] In some embodiments of the present invention, the movable slide 1 has a bottom plate 11 and a top plate 12, the cutter 2 is arranged on the cutter fixing seat 21, and the tape is arranged on the tape fixing seat 31, the cutter fixing seat 21 and the tape fixing seat 31 are located above the top plate 12 of the movable slide 1, and two lifting cylinders 5 connected to the cutter fixing seat 21 and the tape fixing seat 31 are respectively arranged on the bottom plate 11, and the push rod of the lifting cylinder 5 passes through the through hole set on the top plate 12, and drives the cutter 2 and the tape to rise and fall respectively.

[0037] The working process of the coil splicing mechanism of this embodiment is: the edges of the two coils to be spliced ​​are overlapped and placed above the cutter 2, the lifting cylinder 5 connected to the cutter fixing seat 21 is raised, and the cutter 2 is pushed to abut against the coils, then the movable slide 1 starts to move and cuts the edges of the two coils to be spliced, thereby cutting at the edges of the two coils, and there is a gap in the middle of the edges of the two coils after cutting; then, the cylinder rod connected to the cutter fixing seat 21 is retracted; the push rod of the lifting cylinder 5 connected to the tape fixing seat 31 is raised until the tape abuts against the coil, then, the movable slide 1 moves in the opposite direction and adheres the edges of the two coils, thereby forming a splicing of the two coils.

[0038] In some possible implementations of the present invention, only one cutter 2 and one roll of adhesive tape are provided; obviously, the number of the cutters 2 or the adhesive tapes may also be two or more.

[0039] In some embodiments of the present invention, the cutter fixing seat 21 includes a fixed plate 211 and a movable plate 212 arranged opposite to each other, and also includes a rotating shaft arranged perpendicular to the fixed plate 211 and the movable plate 212, the cutter 2 is arranged on the rotating shaft, at least one internal threaded hole is arranged on the movable plate 212, and an internal threaded blind hole is arranged on the body of the cutter fixing seat 21 corresponding to the internal threaded hole on the movable plate 212, so that the movable plate 212 and the cutter fixing seat 21 can be detachably connected by bolts, so that the disassembly and assembly of the rotating shaft is facilitated, thereby realizing the replacement and disassembly of the cutter 2. Correspondingly, the tape fixing seat 31 can also adopt a structure similar to the cutter fixing seat 21 or other structures, which will not be described in detail here.

[0040] In some embodiments of the present invention, the cutter 2 has two annular blades 22 protruding from the outer surface of the cutter 2. The two annular blades 22 are arranged parallel to each other, so that the cutting width when cutting the coil is formed between the two annular blades 22. Obviously, the cutter 2 can also adopt other structures, as long as it is ensured that a neat cutting edge can be formed in the middle of the edges of the two coils after cutting.

[0041] In some embodiments of the present invention, a coil fixing mechanism 13 is also included for fixing the coil to prevent the coil from moving when cutting.

[0042] See attached Figure 3 As shown, in some possible embodiments of the present invention, the coil fixing mechanism 13 includes a moving part respectively arranged corresponding to the end of each coil, and the moving part can drive the edges of the two coils to move in a direction close to each other, thereby preparing for the subsequent splicing of the two coils. The moving part includes a support plate 131 and a fixed plate 132, and the coil can pass through the gap between the fixed plate 132 and the support plate 131. At the same time, the fixed plate 132 can move toward the support plate 131 and fix the end of the coil on the moving part. Before the coil needs to be cut, the coil is first passed through the gap between the fixed plate 132 and the support plate 131, and an edge is reserved to pass through the fixed plate 132 and the support plate 131; after the edges of the two coils are overlapped, the fixed plate 132 is pressed against the support plate 131 to fix the position of the coil, thereby facilitating the subsequent cutting of the coil.

[0043] See attached Figure 4 As shown, when the two moving parts corresponding to the ends of the two coils move toward each other, the edges of the fixed plates 132 can abut against each other, and when the edges of the two fixed plates 132 abut against each other, an operating gap for the cutter and the tape to enter is formed between the two support plates 131. Therefore, when the coil is cut, the abutting edges of the fixed plates 132 provide support for the cutting action.

[0044] The fixing plate 132 of the coil fixing mechanism 13 is hinged on the support plate 131. A gap for the coil to pass through is provided at the hinged portion between the fixing plate 132 and the support plate 131. The fixing plate 132 is made of a plate with a certain weight. When the fixing plate 132 is turned over to be nearly parallel to the support plate 131, the fixing plate 132 can press and fix the coil on the support plate 131. When splicing the coils, two coils are passed through one coil fixing mechanism 13 respectively. When the fixing plate 132 is pressed against the support plate 131, the edge of the fixing plate 132 protrudes from the edge of the support plate 131, so when the coil fixing mechanisms 13 of the two coils are close to each other, the two fixing plates 132 abut against each other, and a gap is provided between the two support plates 131, so that the fixing plates 132 abutting against each other provide support force for the subsequent cutting of the coil, and the reserved gap between the two support plates 131 can be used for the tape or the cutter to perform corresponding sticking or cutting actions on the coil. In the present invention, an elastic clamping block 135 can also be provided on the support plate, and the clamping block 135 can be interference fit with the fixing plate 132, and when the fixing plate 132 is covered on the support plate 131, it ensures that the coil is firmly clamped between the fixing plate 132 and the support plate 131.

[0045] See attached Figure 5-7 As shown, in some other possible embodiments of the present invention, the fixed plate 132 and the support plate 131 are arranged opposite to each other up and down, and at least one pressure strip 133 that can move toward or away from the support plate 131 is also arranged between the fixed plate 132 and the support plate 131, and the pressure strip 133 can be pressed onto the upper surface of the support plate 131 and fix the position of the coil. The pressure strip 133 can be made of soft materials such as silicone or rubber, so as to avoid crushing the coil. The pressure strip 133 can be arranged along the entire length direction of the fixed plate 132, or it can be arranged as independent small units of shorter length. This embodiment also includes a connecting rod 134 that vertically passes through the fixed plate 132 and is connected to the pressure strip 133, the outer surface of the connecting rod 134 is provided with an external thread, and an internal thread hole is provided through the fixed plate 132, and the connecting rod 134 is an external threaded rod, the upper end of which passes through the fixed plate 132 and is connected to the adjusting nut. Before the coils need to be spliced, first adjust the pressure strip 133 to the highest position, then pass the coil through between the fixed plate 132 and the support plate 131, and after the end of the coil is pulled out of the fixed plate 132 and the support plate 131 to a sufficient length, rotate the connecting rod 134 so that the pressure strip 133 clamps the coil to the upper surface of the support plate 131, thereby fixing the coil.

[0046] The outer edges of the fixing plates 132 corresponding to the two coils of material are also provided with fixing edges 136 extending toward each other. When the coils are cut, the two fixing edges 136 abut against each other and form a basis for providing support during cutting.

[0047] Embodiment 2:

[0048] See attached Figure 8 As shown, this embodiment is a laser coil splicing device, which includes the coil splicing mechanism of the first embodiment, the movable slide 1 is slidably arranged on the machine table 43, and also includes a first clamping plate 61 and a second clamping plate 62 for clamping the edge of the coil (that is, equivalent to the movable part corresponding to the two coils of the first embodiment) and a laser welding mechanism for welding the edges of the two spliced ​​coils. The laser welding mechanism includes a fiber laser 71 arranged on the gantry, a fiber laser source 72 connected to the fiber laser 71, and a focusing lens 73 connected to the fiber laser source 72. In some embodiments of the present invention, the tape is a laser tape, so the coil can be welded under the movement of the laser welding mechanism.

[0049] In some embodiments of the present invention, the laser tape includes a substrate layer and a coating adhesive layer. The laser tape substrate layer is made of polyethylene terephthalate (PET) with a thickness of 25-250 μm. The coating adhesive layer contains an infrared absorbing coating and an epoxy resin adhesive. The infrared absorbing coating material includes but is not limited to tungsten trioxide, tin oxide, etc. The coating adhesive layer has a thickness of 1-50 μm.

[0050] The fiber laser 71 can move along the length direction of the gap of the spliced ​​coils, thereby achieving the effect of welding the spliced ​​coils. The near-infrared laser focused light spot emitted by the fiber laser 71 is incident through the upper surface of the pressing gap and irradiates the coating adhesive layer of the laser tape located at the cutting gap, so that the infrared absorption coating of the coating adhesive layer absorbs the near-infrared laser light energy and converts it into heat energy instantly. The heat conduction energy penetrates into the cutting edge of the coil to be spliced ​​through the cutting gap, so that the polymer at the cutting edge of the coil melts, the polymer molecular chain expands, and the chain entanglement is formed, which evenly fills the cutting gap to form a tight welding area.

[0051] In some embodiments of the present invention, the first clamping plate 61 is connected to the first translation cylinder 81, and the second clamping plate 62 is connected to the second translation cylinder 82. The first clamping plate 61 and the second clamping plate 62 can move closer to or farther from each other under the drive of the first translation cylinder 81 and the second translation cylinder 82. When the first clamping plate 61 and the second clamping plate 62 are close to each other, the edges of the two coils can be pressed together. In some embodiments of the present invention, it also includes a vertical plate 9 connected to the machine table 43 and arranged opposite to each other. A slide groove 91 is arranged on the vertical plate 9. The two ends of the first clamping plate 61 and the second clamping plate 62 are respectively located in the slide groove 91 of the vertical plate 9, thereby ensuring that the first clamping plate 61 and the second clamping plate 62 remain stable during the movement.

[0052] In some embodiments of the present invention, the laser coil splicing device further includes a coil feeding mechanism. Accordingly, a coil feeding mechanism for feeding the coil to the middle of the first clamping plate 61 and the second clamping plate 62 is respectively provided on the outer side of the first clamping plate 61 and the second clamping plate 62. The coil feeding mechanism can adopt any existing coil conveying mechanism, which may include a conveying roller 10 located on the outer side of the first clamping plate 61 and (or) the second clamping plate 62, and the coil is conveyed by tensioning the coil and the conveying roller 10. When the coil feeding mechanism is provided, the height of the first translation cylinder 81 and the second translation cylinder 82 are both lower than the height of the first clamping plate 61 and the second clamping plate 62.

[0053] In some embodiments of the present invention, the crossbeam of the gantry for setting the fiber laser 71 is set along the length direction of the gap of the cut coil. When the laser tape needs to be laser welded, the outward speed of the fiber laser can be set faster than the return speed, thereby ensuring both the rapid welding of the laser tape and the splicing efficiency of the coil. For example, the outward speed can be set to 100-200cm / min, and the return speed can be set to 20-100cm / min. The fiber laser 71 can be driven and moved by a variable frequency drive motor.

[0054] In some embodiments of the present invention, the width of the laser tape is 5-20 mm, and the seam width at the joint of the coil material after cutting by the cutter (that is, the width of the cutter cutting area) does not exceed 1 mm. Therefore, the weld width can be minimized and the weld can be ensured to be fully welded and complete.

[0055] Embodiment three:

[0056] This embodiment is a coil splicing process, which includes the following steps:

[0057] ① After overlapping the edges of the two coils, fix the position of the coils; in this step, when overlapping the edges of the coils, ensure the mutual parallelism between the two coils, and the width of the overlapping edges does not need to be too wide, just slightly wider than the width of the subsequent cutter.

[0058] ② In the overlapping area of ​​the coils, cut along the edge of the coil to be pasted. After cutting, the distance between the edges of the two coils is a. In some embodiments of the present invention, the value range of a is 500-1000μm. Of course, the value of a is not limited to this numerical range. The setting direction of the overlapping coils can be parallel to the horizontal plane or inclined to the horizontal plane by no more than 60 degrees, so that it is convenient for the transportation of the coils and the cutting action. When cutting, the cutter can be at a perpendicular angle to the coil, and the cutter can be slid or rolled over the surface of the coil, thereby forming a certain seam width.

[0059] ③ Use laser tape to connect the edges of the two cut coils, the width of the laser tape is b, and b>a; the laser tape can be set on any one side or both sides of the coil, and the ratio of b to a is 5:1-25:1.

[0060] ④ Using a moving laser beam to irradiate the area between the edges of the two rolls of the coiled material. In some embodiments of the present invention, the power of the laser is 30-90W.

[0061] Obviously, the coil splicing process of this embodiment can also be implemented by using the coil splicing equipment in the second embodiment.

[0062] The coiling process using the coiling device of the present invention is compared with the coiling method in the conventional technology. For example, the coiled material to be coiled is a PET coil, and its specification is 250μm*950mm*1000m. The coiling method in the conventional technology is to splice two coils with adhesive tape and then manually squeeze and stick them together. The welding strength-pulling force is tested using a 50KG breaking tensile machine.

[0063] Table 1 Performance comparison of coil splicing process of the present invention and prior art

[0064]

[0065] It can be seen from the above embodiments and comparative examples that when the coil material is spliced, the spliced ​​coil material obtained by laser welding using the process of the present invention has a higher splicing strength - pull-out force, a smaller splicing edge step difference and a longer service life, and the splicing process takes less time.

[0066] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser coil splicing device, comprising a coil splicing mechanism for splicing the edges of coils, characterized in that: include: At least one cutter, used for cutting the edges of two rolls of material to be spliced; Adhesive tape is used to connect the adjacent edges of two coils after cutting; A movable slide, the cutter and the adhesive tape are arranged on the movable slide, the cutter and the adhesive tape can move relative to the movable slide, and the coil can be cut and the adhesive tape can be pasted when the movable slide moves; The slide table is slidably connected with the movable slide seat, and the movable slide seat can slide on the slide table. The tape is a laser tape, It also includes a laser welding mechanism, which includes a laser head that can move along the edge of the coil to be spliced, After cutting, the distance between the edges of the two coils is a, the width of the laser tape is b, and the ratio of b to a is 5:1-25:

1.

2. The laser coiling device according to claim 1, characterized in that: The invention also comprises a coil fixing mechanism for fixing the position of the coil, wherein the coil fixing mechanism can fix the edges of the two coils to a position above the cutter.

3. The laser coiling device according to claim 2, characterized in that: The coil fixing mechanism includes a moving part respectively arranged corresponding to the end of each coil, and the moving parts corresponding to the two coils can move in opposite directions. The moving part includes a support plate and a fixed plate, and a coil accommodating gap is arranged between the fixed plate and the support plate for the coil to pass freely.

4. The laser coiling device according to claim 3, characterized in that: The edges of the two fixing plates arranged corresponding to the ends of the two coils can abut against each other. When the edges of the two fixing plates abut against each other, an operating gap for the cutter and the tape to enter is formed between the two support plates.

5. The laser coiling device according to claim 4, characterized in that: The fixing plate is rotatably connected to the supporting plate, and the fixing plate can be pressed onto the upper surface of the supporting plate.

6. The laser coiling device according to claim 4, characterized in that: It also includes a pressing bar which can move toward or away from the support plate, and the pressing bar can be pressed onto the upper surface of the support plate.

7. The laser coiling device according to claim 2, characterized in that: The cutter is arranged on a liftable cutter fixing seat, the cutter fixing seat includes a fixed plate and a movable plate arranged opposite to each other, and also includes a rotating shaft arranged perpendicular to the fixed plate and the movable plate, the cutter is arranged on the rotating shaft, and the movable plate is detachably connected to the body of the cutter fixing seat.

8. A coil splicing process applied to the laser coil splicing device according to any one of claims 1 to 7, characterized in that: The steps include: After the edges of the two rolls of material are overlapped, the position of the rolls is fixed; In the overlapping area of ​​the coils, cutting is performed along the edges of the coils to be glued. After cutting, the distance between the edges of the two coils is a; Move the laser head of the laser welding mechanism along the edge of the coil to be spliced, and connect the edges of the two cut coils with each other using a laser tape, wherein the width of the laser tape is b, and b>a; The area between the edges of the two webs is irradiated with a moving laser beam.

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