A laser welding device for wind power tower cylinder processing and a welding method thereof

Abstract

The application relates to the technical field of laser welding, in particular to a laser welding device for wind power tower cylinder processing and a welding method thereof. The laser welding device comprises a laser emitter, a shifter for supporting the laser emitter, and a numerical control mechanical arm for controlling the spatial position movement of the shifter. An exhaust wind power tower cylinder is arranged below the laser emitter. Laser emitted by the laser emitter irradiates the outer ring joint of two wind power tower cylinders. The shifter drives the laser emitter to offset along with the wind power tower cylinder. The laser emitter emits laser to the outer ring joint of the two wind power tower cylinders. The outer ring joint rotates one circle to realize welding. If the wind power tower cylinder is offset, the laser emitter is synchronously offset to ensure that the laser can still stably irradiate the outer ring joint of the two wind power tower cylinders. If the two wind power tower cylinders are separated, the laser emitter stops emitting laser to realize safety control.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, specifically to a laser welding device and welding method for processing wind turbine towers. Background Technology

[0002] Wind turbine towers are the support structures in wind power generation. They primarily function as supports in wind turbine generator sets and absorb vibrations from the generator set. During the assembly and welding of wind turbine towers in the factory, the towers are placed on a drive base. After the edges of two towers are joined together, the drive base controls the rotation of the towers. The laser welding equipment then fires a laser at the outer circumferential seam where the two towers meet to achieve the welding.

[0003] The drive base continuously rotates the wind turbine tower, but numerous unforeseen hazards can cause the tower to shift. These include ground vibrations, inaccurate or malfunctioning drive base control leading to tower displacement, drive base issues causing one tower to gradually rotate away from the other, foreign objects falling between the tower and drive base, and impacts from external objects. All these factors can cause tower displacement. During the welding process of the outer circumference joint between the two towers, vibrations or displacements can occur. Although the laser welding equipment has a scanning and positioning mechanism to adjust and correct the laser emitter's position, momentary shifts and vibrations in the towers can prevent the laser emitter from moving synchronously. This causes the emitted laser beam to deviate from the outer circumference joint. Firstly, partial welding of the outer circumference joint is not achieved. Secondly, even after the continuously rotating towers return to their original positions, the laser beam still illuminates the outer circumference joint, creating a welding gap.

[0004] If small welding defects on the outer ring seam are not discovered, the two wind turbine towers will not be firmly welded, and the rigidity of the resulting tower will decrease, posing numerous safety hazards. If the gaps or defects at the outer ring seam where the two wind turbine towers meet are discovered and the welding is repaired, the new weld and the original cooling weld cannot fully bond, which will still lead to a decrease in the weld strength between the two wind turbine towers. In addition, the offset laser beam hitting the outer wall of the wind turbine tower will directly damage the physical structure of the wind turbine tower.

[0005] If the wind turbine towers shift unexpectedly, the laser emitter can shift synchronously. In this way, the laser emitted by the laser emitter can still accurately irradiate the outer ring seam where the two wind turbine towers are joined, thus avoiding welding defects and ensuring the smooth completion of the wind turbine tower welding. Summary of the Invention

[0006] The purpose of this invention is to provide a laser welding device and welding method for wind turbine tower processing, so as to solve the problem mentioned in the background art that the laser emitter cannot keep up with the wind turbine tower offset in time.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a laser welding device for processing wind turbine towers, comprising a laser emitter, an offset device supporting the laser emitter, and a CNC robotic arm controlling the spatial movement of the offset device. A row of wind turbine towers is arranged below the laser emitter. The laser emitted from the laser emitter irradiates the outer circumferential seam where two wind turbine towers are joined, and the offset device drives the laser emitter to shift along with the wind turbine towers. The offset device includes: The lowering cartridge has its top end hinged to a T-plate fixed on a CNC robotic arm to achieve horizontal rotation in response to the horizontal deflection of the outer annular seam. The lowering spring is hinged to the bottom end of the inclined plate, and the first circuit switch connects the lowering spring and the inclined plate. The inclined plate supports the laser emitter. The inclined plate swings longitudinally to cope with the breakage of the splice of two wind turbine towers of different heights, and causes the first circuit switch to control the disconnection of the power supply to the laser emitter. Two symmetrically arranged translational half-mounts on both sides of the inclined plane, and a second circuit switch between the two translational half-mounts. The two translational half-mounts cooperate to clamp the laser emitter, and the two translational half-mounts respectively contact the two wind turbine towers below. The horizontal displacement of the two wind turbine towers in the same direction will drive the translational half-mounts, and the horizontal separation of the two wind turbine towers will cause the second circuit switch to control the disconnection of the power supply to the laser emitter.

[0008] The pressing device includes a T-plate body hinged to the top and a T-plate seat, a vertical slide bar that slides through through holes on both sides of the bottom end of the T-plate body, a first spring sleeved on the outside of the vertical slide bar, and a T-block body fixedly connected between the bottom ends of the two vertical slide bars.

[0009] The inclined device includes a swing frame set below the T-block, front and rear sliding rods fixed on the swing frame, two second springs sleeved on the front and rear sliding rods, and a crossbeam fixed on the laser emitter. The crossbeam slides through the square tube fixed on the swing frame. The two second springs cooperate to clamp the T-block. The front and rear sliding rods slide through the through holes opened on the T-block. The first circuit switch is connected between the T-block and the swing frame.

[0010] The translational semi-fixture includes an inclined plate frame, left and right sliding rods that slide through through holes in a vertical protrusion plate set on the inclined plate frame, two third springs fitted on the left and right sliding rods, and a roller mechanism set at the bottom of the inclined plate frame.

[0011] One end of each of the left and right sliding rods is fixed to the swing frame. A V-shaped plate on the inclined plate allows it to slide through a flat hole in the swing frame. The second circuit switch is connected between the two symmetrical inclined plates. Two third springs cooperate to clamp the vertical protrusions of the inclined plates. V-shaped posts on the inclined plates contact the laser emitter. The roller mechanism includes a row of rollers arranged in an arc along the outer wall of the wind turbine tower, a unit assembly for driving the extension and retraction of the roller assembly, a split shaft driven at one end of each roller assembly, an integrated shaft driven by a row of split shafts, a cam disk with a corresponding drive at one end of each unit assembly, a cutting shaft passing through a row of cam disks, and a spring device connected to one end of the cutting shaft. The cutting shaft and the integrated shaft are supported by a sub-frame on the inclined plate frame. The integrated shaft drives the spring device by rotating at a constant speed, and the spring device drives the cutting shaft to rotate intermittently.

[0012] The roller assembly includes a rubber wheel that contacts the outer wall of the wind turbine tower, a roller shaft fixed in the middle of the rubber wheel, a directional shaft for transmission between the roller shaft and the dividing shaft, and a wheel frame for supporting the directional shaft and the roller shaft. The wheel frame is slidably inserted into a cross plate groove opened on the inclined plate frame. The end of the directional shaft is equipped with a gear to mesh with a gear fixed at the end of the dividing shaft. The dividing shaft is supported by a convex plate on the inclined plate frame. The inclined plate frame and the wind turbine tower are moved synchronously by a row of rubber wheels arranged in an arc and contacting each other. The parts of the rubber wheels that are in contact with the wind turbine tower are compressed and deformed. The row of rubber wheels is restored to full shape by taking turns separating from the wind turbine tower.

[0013] The roller mechanism includes a left frame fixed on the inclined plate frame, and an extension shaft, an adjustment shaft, and an adjustment worm gear supported on the left frame. One end of the adjustment shaft meshes with a rack on the wheel frame through a fixed gear, and the other end of the adjustment shaft meshes with the adjustment worm gear through a fixed worm wheel. The adjustment worm gear and the extension shaft drive perpendicularly.

[0014] The roller mechanism also includes a right-side frame fixed on the inclined plate frame, a push-adjustment column with one end in contact with the edge of the cam plate, a range extender frame that drives the range extender shaft to rotate, a drive shaft that transmits power between the push-adjustment column and the range extender frame, and a compression spring that pushes the push-adjustment column to reset. The other end of the push-adjustment column is slidably sleeved on a partial square column on the right-side frame through a fixed square tube. The cam plate includes a plate body and an arc pad plate set on the edge of the plate body. A row of cam plates controls the alternating displacement of a row of contacting push-adjustment columns by pointing in different directions.

[0015] A laser welding method for processing wind turbine towers includes the following steps: Step 1: A row of wind turbine towers is laid out and spliced ​​together using a drive base. Then, the CNC robotic arm moves to the welding station and controls the offset device to descend, thereby lowering the laser emitter and aligning it with the outer ring seam between the two wind turbine towers. Step 2: All the wind turbine towers begin to rotate synchronously, and the laser emitter fires a laser at the outer circumferential seam between the two wind turbine towers; Step 3: If the two wind turbine towers being spliced ​​accidentally shift horizontally in the same direction, or if the entire splice rotates horizontally, the laser emitter will shift or rotate accordingly. The laser emitted by the laser emitter will continuously and accurately irradiate the outer ring seam of the splice between the two wind turbine towers. Once the outer ring seam rotates one full circle, the welding work is completed. If the horizontal shift of a single wind turbine tower causes the splice between the two wind turbine towers to break, the laser emitter will automatically stop emitting laser to prevent the laser from irradiating the outer wall of the wind turbine tower. Step 4: If the two wind turbine towers being spliced ​​together become tilted with one higher than the other, the laser emitter will automatically stop emitting lasers, regardless of whether the splice is broken or not, in response to the breakage of the splice between the two wind turbine towers or the imminent breakage due to gravity.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The laser emitter emits a laser beam towards the outer ring seam where the two wind turbine towers are joined. The outer ring seam rotates one full circle to achieve welding. If the wind turbine towers shift position, the laser emitter will shift synchronously to ensure that the laser can still stably irradiate the outer ring seam where the two wind turbine towers are joined. If the two wind turbine towers separate, the laser emitter stops emitting laser beams to achieve safety control.

[0017] 2. Two inclined plates are used to clamp the laser emitter. The synchronous movement between the inclined plates and the wind turbine tower requires sufficient adhesion between the rubber wheels and the wind turbine tower. This ensures that the laser emitted by the laser emitter is always aligned with the outer ring seam where the two wind turbine towers are joined. The rubber wheels are softened at the edges to enhance adhesion. At the same time, a row of rubber wheels is separated from the wind turbine tower in turn to prevent the shape of the rubber wheels from irreversibly recovering under long-term pressure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the location of the invention.

[0019] Figure 2 This is a schematic diagram of the offset position.

[0020] Figure 3 This is a schematic diagram showing the location of the laser emitter.

[0021] Figure 4 This is a schematic diagram showing the position of the pressing cartridge.

[0022] Figure 5 This is a schematic diagram of the downward-pressing cartridge structure.

[0023] Figure 6 A schematic diagram of the protective half-cover structure.

[0024] Figure 7This is a schematic diagram of the roller mechanism.

[0025] Figure 8 This is a schematic diagram of the inclined plane structure.

[0026] Figure 9 This is a schematic diagram of the first circuit switch structure.

[0027] Figure 10 This is a schematic diagram of an inclined plate frame structure.

[0028] Figure 11 This is a schematic diagram of the roller assembly structure.

[0029] Figure 12 This is a schematic diagram of the unit integrated structure.

[0030] Figure 13 This is a schematic diagram of the spring mechanism.

[0031] In the diagram: 1. Laser emitter; 2. Offsetter; 3. CNC robotic arm; 4. Wind turbine tower; 4. Drive base; 5. Pressing spring; 6. Inclined bracket; 7. First circuit switch; 7. Conductive plate; 701. Conductive spring; 702. T-plate base; 8. Translational half-bracket; 9. Second circuit switch; 10. Conductive half-bracket; 101. T-plate body; 11. Vertical slide bar; 12. First spring; 13. T-block body; 14. Swing frame; 15. Front and rear slide bars; 16. Second spring; 17. Crossbeam column; 18. Inclined plate frame; 19. Protective half-cover; 191. Sub-frame; 192. Left and right slide bars; 20. Third spring. 21. Spring, 22. Roller mechanism, 23. Roller group, 24. Unit integration, 25. Positioning shaft, 26. Integrated shaft, 27. Cam plate, 28. Positioning shaft, 29. Spring device, 291. Disc cover, 292. Ring spring, 293. Core cylinder, 294. Side worm gear, 295. Locking post, 296. U-shaped spring, 297. Tail frame, 30. Direction shaft, 31. Roller shaft, 32. Wheel frame, 33. Rubber wheel, 34. Push adjustment column, 35. Drive change shaft, 36. Right position frame, 37. Compression spring, 38. Extender frame, 39. Extender shaft, 40. Left position frame, 41. Adjustment shaft, 42. Adjustment worm gear. Detailed Implementation

[0032] 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 technical solutions 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.

[0033] Please see Figures 1 to 13This invention provides a technical solution: a laser welding device for processing wind turbine towers, comprising a laser emitter 1, an offset device 2 supporting the laser emitter 1, and a CNC robotic arm 3 controlling the spatial movement of the offset device 2. A row of wind turbine towers 4 is arranged below the laser emitter 1. The laser emitted from the laser emitter 1 irradiates the outer circumferential seam where two wind turbine towers 4 are joined, and the offset device 2 causes the laser emitter 1 to shift along with the wind turbine towers. The offset device 2 includes: The lowering device 5, the top of the lowering device 5 is hinged to the T-plate seat 8 fixed on the CNC robotic arm 3 to achieve horizontal rotation. In response to the horizontal deflection of the outer ring seam, the displacement of the two spliced ​​wind turbine towers 4 can be varied. If horizontal deflection is involved, then the laser emitter 1, the lowering device 5 and many mechanisms connected below the lowering device 5 will rotate accordingly. The bottom of the lowering spring 5 is hinged to the inclined bracket 6, and a first circuit switch 7 connects the lowering spring 5 and the inclined bracket 6. The inclined bracket 6 supports the laser emitter 1. The inclined bracket 6 swings longitudinally to cope with the breakage of the splice between two wind turbine towers 4 of different heights, and causes the first circuit switch 7 to control the disconnection of the power supply to the laser emitter 1. Each wind turbine tower 4 has a corresponding drive base 401 at its bottom for support. The drive base 401 is a prior art device that can drive the wind turbine tower 4 to lift and position, and can also drive the wind turbine tower 4 to rotate. If the drive base 401 fails unexpectedly and pushes the wind turbine tower 4 above to rise, or if an object falls between the drive base 401 and the wind turbine tower 4 and causes the wind turbine tower 4 to rise while the adjacent wind turbine tower 4 remains stationary, then the two spliced ​​wind turbine towers 4 will break directly, the welded outer ring seam will disappear, and the two wind turbine towers 4 will be at different heights, causing the inclined rod 6 to tilt longitudinally. The disappearance of the outer ring seam requires the laser emitter 1 to stop emitting laser in time. Therefore, the longitudinal tilt of the inclined rod 6 will simultaneously trigger the power supply interruption at the first circuit switch 7, and the laser emitter 1 will be de-energized and stop emitting laser. Two symmetrically arranged translational half-mounts 9 on both sides of the inclined plate 6, and a second circuit switch 10 between the two translational half-mounts 9. The two translational half-mounts 9 cooperate to clamp the laser emitter 1, and the two translational half-mounts 9 respectively contact the two wind turbine towers 4 below. The horizontal displacement of the two wind turbine towers 4 in the same direction will drive the translational half-mounts 9, and the horizontal separation of the two wind turbine towers 4 will cause the second circuit switch 10 to control the disconnection of the power supply to the laser emitter 1.

[0034] refer to Figure 5Understandably, the pressing device 5 includes a T-plate 11 hinged to the top end and a T-plate seat 8, a vertical slide bar 12 that slides through through holes on both sides of the bottom end of the T-plate 11, a first spring 13 sleeved on the outside of the vertical slide bar 12, and a T-block 14 fixedly connected between the bottom ends of the two vertical slide bars 12. A shaft is provided on the T-plate seat 8 to be movably sleeved in the shaft hole opened at the top of the T-plate 11. A limiting disc is provided at the top end of the vertical slide bar 12 to limit the lifting range of the T-block 14.

[0035] refer to Figure 8 The inclined device 6 includes a swing frame 15 located below the T-block 14, front and rear sliding rods 16 fixed on the swing frame 15, two second springs 17 sleeved on the front and rear sliding rods 16, and a crossbeam 18 fixed on the laser emitter 1. The crossbeam 18 slides through the square tube fixed on the swing frame 15. The two second springs 17 cooperate to clamp the T-block 14. The front and rear sliding rods 16 slide through the through holes opened in the T-block 14. The first circuit switch 7 is connected between the T-block 14 and the swing frame 15. The front and rear sliding rods 16 can rotate and move axially in the T-block 14. An intercepting disk is set at the end of the front and rear sliding rods 16 away from the swing frame 15. The laser emitter 1 emits a laser downward to weld the outer circumferential seam below. If the two wind turbine towers 4 are horizontally and radially offset, the swing frame 15 will be driven by the translation half-device 9. The swing frame 15 drives the laser emitter 1 as it moves. The laser emitter 1 will move synchronously with the outer circumferential seam between the two wind turbine towers 4. Thus, the position of the laser irradiation on the outer ring seam remains unchanged; the first circuit switch 7 includes a conductive plate 701 and a conductive spring piece 702 in contact with the conductive plate 701. The conductive plate 701 is fixed on the support column set on the T block 14, and the conductive spring piece 702 is fixed on the protruding column set on the swing frame 15. Even if the horizontal distance between the T block 14 and the swing frame 15 changes, the conductive plate 701 and the conductive spring piece 702 can still contact and conduct electricity. Both the conductive plate 701 and the conductive spring piece 702 are connected to the transmission circuit through conductivity, which is the power transmission circuit that supplies power to the laser emitter 1. When a wind turbine tower 4 accidentally shifts and rises, it will cause the two spliced ​​wind turbine towers 4 to break apart. The two wind turbine towers 4, one high and one low, will affect the swing frame 15 through the translation half 9. The T block 14 is pressed and automatically adjusts and rises. At the same time, the swing frame 15 rotates relative to the T block 14. In this way, the swinging conductive spring piece 702 will separate from the conductive plate 701, so that the laser emitter 1 stops emitting laser.

[0036] refer to Figure 5 Understandably, the translational half-tool 9 includes an inclined plate frame 19, left and right sliding rods 20 that slide through through holes in a vertical protrusion plate set on the inclined plate frame 19, two third springs 21 sleeved on the left and right sliding rods 20, and a roller mechanism 22 set at the bottom of the inclined plate frame 19.

[0037] refer to Figure 10Understanding: One end of the left and right sliding rods 20 is fixed to the swing frame 15. The inclined plate frame 19 slides through the flat plate hole opened on the swing frame 15 by setting a V-shaped plate. The second circuit switch 10 is connected between the two symmetrical inclined plate frames 19. Two third springs 21 cooperate to clamp the vertical protrusion of the inclined plate frame 19. The inclined plate frame 19 is connected to the laser emitter 1 by setting a V-shaped column. The other end of the inclined plate frame 19 is equipped with an intercepting disk. A protective half-cover 191 is fixed on the side of the inclined plate frame 19 opposite to the roller mechanism 22. The two protective half-covers 191 cooperate to cover the scattered material and fumes during laser welding. The bottom of the laser emitter 1 passes through the notch opened on the protective half-cover 191. The fumes and scattered material will be discharged through the exhaust pipe fixedly connected to the protective half-cover 191. The exhaust pipe is connected to the existing fume treatment mechanism. If the two spliced ​​wind turbine towers 4 move axially in the same direction, the roller mechanism 22 will drive the inclined plate frame 19 to move axially. The two inclined plates 19 will translate in the same direction, and the distance between the two inclined plates 19 will remain unchanged. The laser emitter 1 held between the two inclined plates 19 will translate synchronously. In this way, the laser emitted by the laser emitter 1 will always irradiate the outer ring seam between the two wind turbine towers 4. If one wind turbine tower 4 shifts axially while the other wind turbine tower 4 remains unchanged, then the two wind turbine towers 4 will break apart, and the laser emitter 1 will need to stop emitting laser. Specifically, the wind turbine tower 4 drives the inclined plates 19, and the two inclined plates 19 will separate relative to each other. The second circuit switch 10 includes two sliding contact conductive halves 101. Both conductive halves 101 are externally connected to the transmission circuit of the laser emitter 1 through wires. Each conductive half 101 is fixed on one inclined plate 19. The separation of the two inclined plates 19 will cause the two conductive halves 101 to separate, thus disconnecting the transmission circuit of the laser emitter 1 and stopping the laser emitter 1 from emitting laser.

[0038] The first spring 13, the second spring 17, and the third spring 21 are all used for later reset. After welding stops, the CNC robotic arm 3 drives the offset device 2 to rise, and under the push of the first spring 13, the second spring 17, and the third spring 21, each structure will automatically reset.

[0039] refer to Figure 7 The roller mechanism 22 includes a row of roller sets 23 arranged in an arc along the outer wall of the wind turbine tower 4, a unit integration 24 for driving the extension and retraction of the roller sets 23, a split shaft 25 for one end of each roller set 23, an integrated shaft 26 for the row of split shafts 25, a cam disk 27 for one end of each unit integration 24, a cutting shaft 28 passing through the row of cam disks 27, and a spring device 29 connected to one end of the cutting shaft 28. The cutting shaft 28 and the integrated shaft 26 are supported on the inclined plate frame 19 by a sub-frame 192. The integrated shaft 26 drives the spring device 29 by rotating at a constant speed, and the spring device 29 drives the cutting shaft 28 to rotate intermittently.

[0040] The spring mechanism 29 includes a disc cover 291 fixedly sleeved on one end of the cutting shaft 28, a core cylinder 293 rotating at a constant speed at the end of the disc cover 291, an annular spring 292 connected between the disc cover 291 and the core cylinder 293, a side worm 294 driven by an annular worm gear fixed to the outside of the core cylinder 293, a tailstock 297 supporting the side worm 294, a locking pin 295 locking the disc cover 291, and a U-shaped spring 296 pushing the locking pin 295. The integrated shaft 26 and the cutting shaft 28 are respectively movably sleeved in different through holes opened on the sub-frame 192. One end of the integrated shaft 26 is driven by a fixed bevel gear to change direction with the bevel gear fixed at the bottom of the side worm 294. The disc cover 291 is fixed on the sub-frame 192, and the side worm 294 is movably sleeved in the through hole opened on the tail frame 297. In this way, the integrated shaft 26 drives the side worm 294, and the side worm 294 drives the core cylinder 293 to rotate slowly and uniformly. The end of the cutting shaft 28 is locked into the annular groove opened on the inner wall of the core cylinder 293 through the fixed disc body. The annular spring 292 is fixedly sleeved on the core cylinder 293, and the outer end of the annular spring 292 is fixed on the annular cylinder set on the disc cover 291. The rotation of the core cylinder 293 will cause the annular spring 292 to gradually contract and store force. When the stored force is sufficient, it will break the locking position of the locking post 295. Five V-shaped grooves are evenly arranged around the outer edge of the cover 291 to accommodate the drive switching of five cam discs 27 in a row, so that each cam disc 27 alternately presses and drives the corresponding roller mechanism 22. (Refer to the attached instruction manual.) Figure 13 The locking post 295 slides through the square hole in the tailstock 297, and one end of the U-shaped spring clip 296 is fixed to the tailstock 297. Figure 13 The demonstration shows the switching phase. After the switching is complete, the tip on the locking post 295 will re-engage in the next V-groove on the cover body 291. As mentioned before, sufficient power will break the locking state, the locking post 295 will disengage from one V-groove, the annular spring 292 will release the pressure, the cover body 291 will rotate one-fifth of a turn, and the locking post 295 will engage in the next V-groove. This process continues, and the cover body 291 drives the cutting shaft 28 to rotate once every certain period of time, thus controlling the intermittent rotation of a row of cam discs 27.

[0041] The roller assembly 23 includes a rubber wheel 33 that contacts the outer wall of the wind turbine tower 4, a roller shaft 31 fixed in the middle of the rubber wheel 33, a directional shaft 30 that drives the roller shaft 31 and the dividing shaft 25, and a wheel frame 32 for supporting the directional shaft 30 and the roller shaft 31. The wheel frame 32 is slidably inserted into a cross plate groove opened on the inclined plate frame 19. The end of the directional shaft 30 is provided with a gear to mesh with the gear fixed at the end of the dividing shaft 25. The dividing shaft 25 is supported by a protrusion on the inclined plate frame 19. The inclined plate frame 19 and the wind turbine tower 4 are moved synchronously by a row of rubber wheels 33 arranged in an arc and contacting each other. The parts of the rubber wheels 33 that are in contact with the wind turbine tower 4 are compressed and deformed. The row of rubber wheels 33 is restored to fullness by taking turns separating from the wind turbine tower 4.

[0042] The laser emitter 1 can move synchronously with the outer ring gap between the two wind turbine towers 4. The inclined plate frame 19 from the limit can move synchronously with the wind turbine tower 4, that is, the rubber wheel 33 at the end moves synchronously with the wind turbine tower 4. There needs to be sufficient adhesion between the rubber wheel 33 and the wind turbine tower 4. The outer edge of the rubber wheel 33 is relatively soft. During the contact process between the rubber wheel 33 and the wind turbine tower 4, the rubber wheel 33 is subjected to pressure from the first spring 13. The contact part on the rubber wheel 33 is flattened by the reverse pressure of the wind turbine tower 4. As the wind turbine tower 4 rotates, it drives the rubber wheel 33 to rotate continuously. From the analysis of the local outer edge of the rubber wheel 33, the local area is repeatedly compressed and deformed, that is, the local area is not fully saturated and is compressed again. Therefore, the rubber wheel 33 needs a sufficient recovery time. Therefore, a row of rubber wheels 33 is set at the bottom of the inclined plate frame 19. Each rubber wheel 33 is lifted in turn and the rubber wheel 33 is in a suspended state. This gives the rubber wheel 33 enough recovery time and avoids irreversible elastic recovery caused by excessive pressure.

[0043] The roller mechanism 22 includes a left frame 40 fixed on the inclined plate frame 19, and an extension shaft 39, an adjustment shaft 41 and an adjustment worm gear 42 supported on the left frame 40. One end of the adjustment shaft 41 meshes with a rack on the wheel frame 32 through a fixed gear, and the other end of the adjustment shaft 41 meshes with the adjustment worm gear 42 through a fixed worm wheel. The adjustment worm gear 42 and the extension shaft 39 are driven perpendicularly.

[0044] The roller mechanism 22 also includes a right frame 36 fixed on the inclined plate frame 19, a push adjustment column 34 with one end in contact with the edge of the cam plate 27, a range extender frame 38 that drives the range extender shaft 39 to rotate, a drive shaft 35 that transmits power between the push adjustment column 34 and the range extender frame 38, and a compression spring 37 that pushes the push adjustment column 34 to reset. The other end of the push adjustment column 34 is slidably sleeved on a partial square column on the right frame 36 through a fixed square tube. The cam plate 27 includes a plate body and an arc pad plate set on the edge of the plate body. A row of cam plates 27 controls the row of contacting push adjustment columns 34 to move in turn by pointing in different directions.

[0045] Reference Appendix Figure 12The rightward movement of the push-adjustment column 34 causes the drive shaft 35 to rotate. The drive shaft 35 is movably sleeved in a through hole on the right-side bracket 36. One end of the drive shaft 35 engages with a rack at one end of the push-adjustment column 34 via a fixed gear. The other end of the drive shaft 35 is fixed to the range extender bracket 38. The movement of the push-adjustment column 34 causes the range extender bracket 38 to swing. A compression spring 37 is sleeved on a cylinder on the right-side bracket 36 and is used to push the push-adjustment column 34 to reset. The range extender bracket 38 drives the range extender shaft 39 to rotate via an arc-shaped rack, extending the range... Shaft 39, adjusting shaft 41 and adjusting worm 42 are respectively movably sleeved in different through holes opened on the left frame 40. One end of the range extender shaft 39 meshes with the arc rack on the range extender frame 38 through a fixed gear, and the other end of the range extender shaft 39 meshes with the bevel gear fixed at the end of the adjusting worm 42 through a fixed bevel gear. The rotation of the range extender shaft 39 will drive the adjusting worm 42, which in turn drives the adjusting shaft 41 to rotate, thereby causing the wheel frame 32 to move, the roller assembly 23 to move as a whole, and the rubber wheel 33 to separate from the wind turbine tower 4.

[0046] All rubber wheels 33 are connected to the integrated shaft 26 for transmission. Even when a single rubber wheel 33 is lifted, the integrated shaft 26 still rotates stably. The rotation of the rubber wheel 33 drives the roller shaft 31. The end of the roller shaft 31 is connected to the bevel gear fixed at the end of the directional shaft 30 via a fixed bevel gear, which drives the directional shaft 30 to the positioning shaft 25. The end of the positioning shaft 25 is connected to the annular bevel gear fixed on the integrated shaft 26 via a fixed bevel gear, which drives the integrated shaft 26 in a different direction. In this way, the integrated shaft 26 rotates stably. In addition, the directional shaft 30 moves axially, and the gear meshing between the directional shaft 30 and the positioning shaft 25 is not broken, so stable transmission is still possible. The positioning shaft 28 and the integrated shaft 26 are in a straight line state, and a row of rubber wheels 33 are arranged in an arc shape, creating a distance difference in the middle. This invention adapts and addresses this by using a row of positioning shafts 25 of different lengths and a row of push-adjusting columns 34 of different lengths.

[0047] A laser welding method for processing wind turbine towers includes the following steps: Step 1: A row of wind turbine towers 4 are laid out and spliced ​​together by using a drive base. Then, the CNC robotic arm 3 moves to the welding station and controls the offset device 2 to descend, so that the laser emitter 1 descends and aligns with the outer ring seam between the two wind turbine towers 4. Step 2: All the wind turbine towers 4 begin to rotate synchronously, and the laser emitter 1 emits a laser towards the outer ring seam between the two wind turbine towers 4; Step 3: If the two wind turbine towers 4 are accidentally offset horizontally in the same direction, or if the entire splice is deflected horizontally, the laser emitter 1 will offset or deflect accordingly. The laser emitted by the laser emitter 1 will continuously and accurately irradiate the outer ring seam of the splice of the two wind turbine towers 4. Once the outer ring seam rotates one full circle, the welding work is completed. If the horizontal offset of a single wind turbine tower 4 causes the splice of the two wind turbine towers 4 to break, the laser emitter 1 will automatically stop emitting laser to prevent the laser from irradiating the outer wall of the wind turbine tower 4. Step 4: If the two spliced ​​wind turbine towers 4 tilt to one side and the other side, regardless of whether the splice is broken, the laser emitter 1 will automatically stop emitting lasers to deal with the splice break between the two wind turbine towers 4, or the imminent breakage due to gravity.

[0048] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser welding device for processing wind turbine towers, characterized in that: The system includes a laser emitter, an offset device supporting the laser emitter, and a CNC robotic arm controlling the spatial movement of the offset device. A row of wind turbine towers is positioned below the laser emitter. The laser emitted from the laser emitter illuminates the outer circumferential seam where two wind turbine towers meet. The offset device causes the laser emitter to shift along with the wind turbine towers. The offset device includes: The lowering cartridge has its top end hinged to a T-plate fixed on a CNC robotic arm to achieve horizontal rotation in response to the horizontal deflection of the outer annular seam. The lowering spring is hinged to the bottom end of the inclined plate, and the first circuit switch connects the lowering spring and the inclined plate. The inclined plate supports the laser emitter. The inclined plate swings longitudinally to cope with the breakage of the splice of two wind turbine towers of different heights, and causes the first circuit switch to control the disconnection of the power supply to the laser emitter. Two symmetrically arranged translational half-mounts on both sides of the inclined plane, and a second circuit switch between the two translational half-mounts. The two translational half-mounts cooperate to clamp the laser emitter, and the two translational half-mounts respectively contact the two wind turbine towers below. The horizontal displacement of the two wind turbine towers in the same direction will drive the translational half-mounts, and the horizontal separation of the two wind turbine towers will cause the second circuit switch to control the disconnection of the power supply to the laser emitter.

2. The laser welding equipment for wind turbine tower processing according to claim 1, characterized in that: The pressing device includes a T-plate body hinged to the top and a T-plate seat, a vertical slide bar that slides through through holes on both sides of the bottom end of the T-plate body, a first spring sleeved on the outside of the vertical slide bar, and a T-block body fixedly connected between the bottom ends of the two vertical slide bars.

3. The laser welding equipment for wind turbine tower processing according to claim 2, characterized in that: The inclined device includes a swing frame set below the T-block, front and rear sliding rods fixed on the swing frame, two second springs sleeved on the front and rear sliding rods, and a crossbeam fixed on the laser emitter. The crossbeam slides through the square tube fixed on the swing frame. The two second springs cooperate to clamp the T-block. The front and rear sliding rods slide through the through holes opened on the T-block. The first circuit switch is connected between the T-block and the swing frame.

4. The laser welding equipment for wind turbine tower processing according to claim 3, characterized in that: The translational semi-fixture includes an inclined plate frame, left and right sliding rods that slide through through holes in a vertical protrusion plate set on the inclined plate frame, two third springs fitted on the left and right sliding rods, and a roller mechanism set at the bottom of the inclined plate frame.

5. The laser welding equipment for wind turbine tower processing according to claim 4, characterized in that: One end of the left and right sliding rods is fixed to the swing frame. The inclined plate frame slides through the flat plate hole opened on the swing frame by setting a V-shaped plate. The second circuit switch is connected between the two symmetrical inclined plates. Two third springs cooperate to clamp the vertical protrusion of the inclined plate frame. The inclined plate frame is in contact with the laser emitter by setting a V-shaped column.

6. The laser welding equipment for wind turbine tower processing according to claim 4, characterized in that: The roller mechanism includes a row of rollers arranged in an arc along the outer wall of the wind turbine tower, a unit assembly for driving the extension and retraction of the roller assembly, a split shaft driven at one end of each roller assembly, an integrated shaft driven by a row of split shafts, a cam disk with a corresponding drive at one end of each unit assembly, a cutting shaft passing through a row of cam disks, and a spring device connected to one end of the cutting shaft. The cutting shaft and the integrated shaft are supported by a sub-frame on the inclined plate frame. The integrated shaft drives the spring device by rotating at a constant speed, and the spring device drives the cutting shaft to rotate intermittently.

7. The laser welding equipment for wind turbine tower processing according to claim 6, characterized in that: The roller assembly includes a rubber wheel that contacts the outer wall of the wind turbine tower, a roller shaft fixed in the middle of the rubber wheel, a directional shaft for transmission between the roller shaft and the dividing shaft, and a wheel frame for supporting the directional shaft and the roller shaft. The wheel frame is slidably inserted into a cross plate groove opened on the inclined plate frame. The end of the directional shaft is equipped with a gear to mesh with a gear fixed at the end of the dividing shaft. The dividing shaft is supported by a convex plate on the inclined plate frame. The inclined plate frame and the wind turbine tower are moved synchronously by a row of rubber wheels arranged in an arc and contacting each other. The parts of the rubber wheels that are in contact with the wind turbine tower are compressed and deformed. The row of rubber wheels is restored to full shape by taking turns separating from the wind turbine tower.

8. The laser welding equipment for wind turbine tower processing according to claim 7, characterized in that: The roller mechanism includes a left frame fixed on the inclined plate frame, and an extension shaft, an adjustment shaft, and an adjustment worm gear supported on the left frame. One end of the adjustment shaft meshes with a rack on the wheel frame through a fixed gear, and the other end of the adjustment shaft meshes with the adjustment worm gear through a fixed worm wheel. The adjustment worm gear and the extension shaft drive perpendicularly.

9. A laser welding device for processing wind turbine towers according to claim 8, characterized in that: The roller mechanism also includes a right-side frame fixed on the inclined plate frame, a push-adjustment column with one end in contact with the edge of the cam plate, a range extender frame that drives the range extender shaft to rotate, a drive shaft that transmits power between the push-adjustment column and the range extender frame, and a compression spring that pushes the push-adjustment column to reset. The other end of the push-adjustment column is slidably sleeved on a partial square column on the right-side frame through a fixed square tube. The cam plate includes a plate body and an arc pad plate set on the edge of the plate body. A row of cam plates controls the alternating displacement of a row of contacting push-adjustment columns by pointing in different directions.

10. A laser welding method for processing wind turbine towers, using the laser welding equipment for processing wind turbine towers as described in claim 1, characterized in that, Includes the following steps: Step 1: A row of wind turbine towers is laid out and spliced ​​together using a drive base. Then, the CNC robotic arm moves to the welding station and controls the offset device to descend, thereby lowering the laser emitter and aligning it with the outer ring seam between the two wind turbine towers. Step 2: All the wind turbine towers begin to rotate synchronously, and the laser emitter fires a laser at the outer circumferential seam between the two wind turbine towers; Step 3: If the two wind turbine towers being spliced ​​accidentally shift horizontally in the same direction, or if the entire splice rotates horizontally, the laser emitter will shift or rotate accordingly. The laser emitted by the laser emitter will continuously and accurately irradiate the outer ring seam of the splice between the two wind turbine towers. Once the outer ring seam rotates one full circle, the welding work is completed. If the horizontal shift of a single wind turbine tower causes the splice between the two wind turbine towers to break, the laser emitter will automatically stop emitting laser to prevent the laser from irradiating the outer wall of the wind turbine tower. Step 4: If the two wind turbine towers being spliced ​​together become tilted with one higher than the other, the laser emitter will automatically stop emitting lasers, regardless of whether the splice is broken or not, in response to the breakage of the splice between the two wind turbine towers or the imminent breakage due to gravity.

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