Wind power generator rotor welding device

Abstract

The invention discloses a wind power generator rotor welding device and relates to the technical field of submerged arc welding, the wind power generator rotor welding device comprises a welding frame and an assembly tool, a welding groove is formed in the middle of the welding frame in a penetrating mode, and a submerged arc welding machine is slidably installed in the welding groove. According to the wind power generator rotor welding device, the first workpiece is adjusted to be in the optimal ship-shaped state through the roller carrier to be welded, and after the first submerged arc welding is completed, the second submerged arc welding is continuously carried out, so that the preheating temperature of a welding seam is maintained, meanwhile, the tempering treatment is carried out on the first welding seam, and a submerged arc welding machine is matched, so that the welding efficiency is improved. The heat input of each welding seam can be balanced, the situation that the positioning welding seam cracks frequently is prevented, the welding quality is effectively improved, and the welding efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of submerged arc welding technology, and more specifically to a welding device for wind turbine rotors. Background Technology

[0002] In recent years, wind power generation technology has developed rapidly, and wind turbines have become increasingly larger, leading to a gradual increase in the power output of the matching generators. This has placed increasingly stringent requirements on the welding of generator rotors. A wind turbine rotor consists of a rotor shaft, with several ribs, typically six, mounted on the shaft body. With continuously improving technical requirements, the positional accuracy of the two ends of the six ribs on the wind turbine rotor has been improved from 2.5mm to 1.5mm. Previously, the positional accuracy of the rib ends was controlled by repeatedly measuring them during submerged arc welding to adjust the welding sequence and manage rib deformation. Even so, most rotors still required flame straightening or mechanical pressing after welding. Furthermore, the lack of efficient assembly fixtures during rib assembly resulted in repeated measurement and positioning, leading to low assembly efficiency, inconsistent preheating temperatures, frequent cracking of the positioning welds, and ultimately, poor weld quality.

[0003] Therefore, it is necessary to introduce a wind turbine rotor welding device to improve weld quality and welding efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a welding device for wind turbine rotors to solve the technical problems of low rib assembly efficiency and inability to guarantee welding quality.

[0005] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: a wind turbine rotor welding device, including a welding frame and assembly fixtures for assembling a second workpiece and several first workpieces, wherein the second workpiece is a wind turbine rotor shaft, and the first workpieces are ribs mounted on the body of the wind turbine rotor shaft; a movable submerged arc welding machine is mounted on the welding frame, a welding groove is formed through the middle of the welding frame, the welding torch of the submerged arc welding machine is located in the welding groove, and an upward-facing recovery box is provided below the welding frame, with support boxes and electric push rods at both ends of the recovery box, and a liftable roller frame is provided inside the support box. Both ends of the receiving box are fixedly installed with U-shaped frames. Each U-shaped frame can be slidably installed with a T-shaped frame. The output end of each electric push rod is fixedly connected to the T-shaped frame on the same side. Each T-shaped frame is fixedly connected to the roller frame at the same end. Each support box has a sliding groove on one side for the T-shaped frame to move up and down. A cooling plate and a preheating plate are slidably installed in the two T-shaped frames. The cooling plate and the preheating plate are symmetrically arranged about the central axis of the T-shaped frame. The cooling plate is equipped with a cooling device for cooling the welded area, and the preheating plate is equipped with a preheating device for heating the welded area. Each T-shaped frame is equipped with an adjustment component for adjusting the distance between the cooling plate and the preheating plate.

[0006] Furthermore, in the aforementioned wind turbine rotor welding device, the assembly fixture includes: a pair of assembly discs, each with a through hole in the center, and an assembly fitting connected to the through hole on the outer side of each disc, each fitting being coaxial with the corresponding through hole; several assembly slots on the inner side of each disc, all of which surround the through hole and are arranged radially along the disc; the pair of assembly discs respectively fitted and clamped at both ends of a second workpiece, the pair of fittings being coaxial with the second workpiece, the fittings being fixed to the body of the second workpiece with adjusting bolts; both ends of each first workpiece being clamped in the assembly slots of the pair of assembly discs; all first workpieces being evenly spaced around the circumference of the second workpiece, and the plate of each first workpiece being arranged radially along the second workpiece; and two roller frames supporting both ends of the second workpiece.

[0007] Furthermore, in the aforementioned wind turbine rotor welding device, a first rack is fixedly installed on one side of each U-shaped frame; each adjusting component includes a rotating shaft, a first gear, a second gear, a second rack, and a third rack. The first gear is coaxially fixedly installed at one end of the rotating shaft, the second gear is coaxially fixedly installed at the other end of the rotating shaft, the second rack is fixedly installed on the upper part of the cooling plate, and the third rack is fixedly installed on the lower part of the preheating plate. The second rack and the third rack are located above and below the T-shaped frame, respectively. The rotating shaft is located on one side of the U-shaped frame, and the end of the rotating shaft with the second gear extends into the T-shaped frame. The first gear meshes with the first rack, and the second gear meshes with both the second rack and the third rack.

[0008] Furthermore, in the aforementioned wind turbine rotor welding device, the cooling device includes: a first screw rotatably connected inside the cooling plate; a first motor fixedly installed at one end of the cooling plate; the output end of the first motor passing through the cooling plate and coaxially fixedly connected to the first screw; a first slider threadedly connected to the first screw; and the first slider slidingly connected to the interior of the cooling plate; and a wind-cooling gun for releasing cold air to a second workpiece fixedly installed on the first slider.

[0009] Furthermore, in the aforementioned wind turbine rotor welding device, the air-cooling gun is equipped with a fan, and one end of the air-cooling gun is connected to an air source through a gas delivery pipe.

[0010] Furthermore, in the aforementioned wind turbine rotor welding device, the preheating device includes: a second screw rotatably connected inside the preheating plate; a second motor fixedly installed at one end of the preheating plate; the output end of the second motor passing through the preheating plate and coaxially fixedly connected to the second screw; a second slider threadedly connected to the second screw; and the second slider slidingly connected to the interior of the preheating plate; and a preheating gun for releasing flames onto the second workpiece fixedly installed on the second slider.

[0011] Furthermore, in the aforementioned wind turbine rotor welding device, the preheating gun is equipped with a welding torch for heating, and one end of the preheating gun is connected to a combustible gas source and an oxygen source through a gas delivery pipe.

[0012] Furthermore, in the aforementioned wind turbine rotor welding device, a filter screen is provided at the upper end of the recycling bin.

[0013] Furthermore, in the aforementioned wind turbine rotor welding device, a spring is provided between the roller frame and the support box.

[0014] Compared with the prior art, the present invention has the following advantages: The roller frame in the wind turbine rotor welding device of this invention greatly facilitates welding operations and welding position adjustments. The roller frame adjusts the first workpiece to an optimal "boat-shaped" state for welding. After the first submerged arc welding is completed, the second submerged arc welding is performed continuously, maintaining the preheating temperature of the weld while simultaneously tempering the first weld. Combined with the submerged arc welding machine, this ensures balanced heat input for each weld, significantly improving welding efficiency and quality, and preventing cracking in the locating welds. Throughout the welding process, the welding sequence can be easily adjusted to reduce welding stress and deformation, further enhancing welding quality and efficiency.

[0015] Second, the fixing function of the assembly fixture can not only improve the assembly efficiency between the first workpiece, i.e., the rib plate, and the second workpiece, i.e., the wind turbine rotor, but also achieve precise control of the position of the first workpiece, i.e., the rib plate, after welding, thereby greatly improving the welding quality.

[0016] Third, the cooperative structure of the first rack, the rotating shaft of the adjustment component, the first gear, the second gear, the second rack, and the third rack enables the synchronous adjustment of the distance between the cooling plate and the preheating plate and the support height of the second workpiece when the electric push rod is lifted and lowered. The structure is simple and ingenious, so as to realize the processing and manufacturing of wind turbine rotors of different sizes.

[0017] IV. Cooling and preheating devices are respectively installed on the cooling plate and the preheating plate, which can meet the temperature required during the welding process, thereby greatly improving the welding quality. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the wind turbine rotor welding device of the present invention without the recycling box; Figure 2 This is a schematic diagram of the structure of the recycling box in the wind turbine rotor welding device of the present invention; Figure 3 This is a schematic diagram of the support box in a wind turbine rotor welding device according to the present invention; Figure 4 This is a side view of a wind turbine rotor welding device according to the present invention; Figure 5 This is a schematic diagram of the adjustment component in a wind turbine rotor welding device according to the present invention; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the spiral frame structure in a wind turbine rotor welding device according to the present invention; Figure 8 for Figure 7 Enlarged view of point B in the middle; Figure 9 This is a schematic diagram of the overall structure of the first and second workpieces. Figure 10 This is a schematic diagram of the assembly plate in the wind turbine rotor welding device of the present invention.

[0020] The labels in the diagram represent the following: 1. First workpiece; 2. Second workpiece; 3. Welding frame; 4. Submerged arc welding machine; 5. Recycling box; 6. Support box; 7. Electric push rod; 8. Roller frame; 9. Spring; 10. U-shaped frame; 11. First rack; 12. T-shaped frame; 13. Assembly fixture; 131. Assembly plate; 132. Assembly kit; 133. Assembly slot; 134. Assembly plate through hole; 20. Adjustment component; 21. Rotating shaft; 22. First gear; 23. Second gear; 24. Second rack; 25. Third rack; 30. Cooling plate; 31. First screw; 32. First motor; 33. First slider; 34. Air-cooled gun; 40. Preheating plate; 41. Second screw; 42. Second motor; 43. Second slider; 44. Preheating gun; 51. Filter screen. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 10As shown, the present invention provides a wind turbine rotor welding device, including a welding frame 3 and an assembly fixture 13 for assembling a second workpiece 2 and a plurality of first workpieces 1. The second workpiece 2 is a wind turbine rotor shaft, and the first workpiece 1 is a rib plate installed on the body of the wind turbine rotor shaft.

[0024] A submerged arc welding machine 4, which can move on the welding frame 3, is mounted on the welding frame 3. A welding groove is opened through the middle of the welding frame 3, and the welding torch of the submerged arc welding machine 4 is located in the welding groove. A recycling bin 5 with its opening facing upward is set below the welding frame 3. Support boxes 6 and electric push rods 7 are set at both ends of the recycling bin 5. Roller frames 8 that can be raised and lowered are set inside the support boxes 6, and springs 9 are set between the roller frames 8 and the support boxes 6. A U-shaped frame 10 is fixedly installed at both ends of the recycling bin 5. A T-shaped frame 12 can be raised and lowered and slidably installed in each U-shaped frame 10. The output end of each electric push rod 7 is fixedly connected to a T-shaped frame 12 on the same side. One end of each T-shaped frame 12 is fixedly connected to a roller frame 8 on the same end. Each support box 6 has a sliding groove on one side for the T-shaped frame 12 to move up and down. A cooling plate 30 and a preheating plate 40 are slidably installed in both T-shaped frames 12. The cooling plate 30 and the preheating plate 40 are symmetrically arranged about the central axis of the T-shaped frame 12. The cooling plate 30 is equipped with a cooling device for cooling the weld joint, and the preheating plate 40 is equipped with a preheating device for heating the weld joint. Each T-shaped frame 12 is equipped with an adjustment component 20 for adjusting the distance between the cooling plate 30 and the preheating plate 40.

[0025] In this embodiment, the assembly fixture 13 includes: a pair of assembly discs 131, each assembly disc 131 having an assembly disc through hole 134 in the center, and each assembly disc 131 having an assembly fitting 132 communicating with the assembly disc through hole 134 on its outer side. Each assembly fitting 132 is coaxial with the corresponding assembly disc through hole 134. Each assembly disc 131 has a plurality of assembly slots 133 on its inner side, and all the assembly slots 133 on each assembly disc 131 are arranged around the assembly disc through hole 134, and each assembly slot 133 is along the assembly disc. The radial arrangement of 131; a pair of assembly discs 131 are respectively fitted and clamped at both ends of the second workpiece 2, and a pair of assembly parts 132 are coaxial with the second workpiece 2. The assembly parts 132 and the body of the second workpiece 2 are fixed by adjusting bolts. Both ends of each first workpiece 1 are clamped in the assembly slots 133 of the pair of assembly discs 131. All first workpieces 1 are evenly spaced around the circumference of the second workpiece 2, and the plate of each first workpiece 1 is arranged along the radial direction of the second workpiece 2. Two roller frames 8 are respectively supported at both ends of the second workpiece 2.

[0026] Before welding, the second workpiece 2 is placed on two roller frames 8, and several first workpieces 1 are evenly arranged along the circumference of the second workpiece 2 using assembly fixture 13. Adjusting bolts ensure that the assembly fixture 13 and the second workpiece 2 are coaxially aligned. The spacing between a pair of assembly discs 131 meets the length requirements of the first workpiece 1. The assembly fixture 13 has high rigidity, effectively controlling the position of both ends of the first workpiece 1 during the assembly stage. During submerged arc welding, the second workpiece 2 can rotate on the roller frames 8, greatly facilitating the adjustment of the welding position. Figure 4 As shown, the first workpiece 1 is adjusted to the optimal "boat-shaped" state, that is, the two adjacent first workpieces 1 are symmetrically located on both sides of the welding gun of the submerged arc welding machine 4, and the two first workpieces 1 and the second workpiece 2 form an outward-opening "U"-shaped structure in the cross-section. Welding is carried out in this state.

[0027] Specifically, in the process of gas metal arc welding and submerged arc welding of structures such as rotor shafts, circular tubes, or other similar structures, the structural and positional relationship between the first workpiece 1 and the second workpiece 2 to be welded can be referred to in conjunction with the following: Figure 1 and Figure 4 For example: The first workpiece 1 is made of 50mm thick Q355D material. Q355D is a low-alloy high-strength structural steel, which belongs to the steel grade specified in the Chinese national standard GB / T1591-2018. The second workpiece 2 has a shaft-like weld with a diameter of approximately 530mm. The end of the first workpiece 1 is machined with a 10*45° bevel structure, so that the first workpiece 1 and the second workpiece 2 together form an arc end face, and then corner welded. Lincoln V-71 carbon dioxide gas shielded flux-cored welding wire is used, which is made of carbon steel and has a wire diameter of 1. 0mm, Lincoln V-71 conforms to the specifications for arc welding electrodes using flux-cored carbon steel, used for welding medium-strength steel. The shielding gas is 99.95% pure carbon dioxide gas, and a centralized gas supply is used. The preheating temperature before welding is >70℃, the welding current is set to 270A (actually 267A), and the voltage is set to 28V. The length of the tack weld should be ≥75mm. The spacing between tack welds should be approximately 250mm. Then, tack welds are performed on the first workpiece at one point, and the weld points are connected to form the root weld. This results in a better welding effect and no surface cracks.

[0028] The weld between the first workpiece 1 and the second workpiece 2 typically requires two passes. After using the assembly fixture 13, each first workpiece 1 and second workpiece 2 undergoes a second submerged arc welding pass continuously after the first pass, maintaining the preheating temperature of the weld while simultaneously tempering the first weld. The submerged arc welding machine 4 uses digital signal control parameters, minimizing human error and ensuring balanced heat input for each weld pass, preventing cracking during locating welds. During welding, supported by the roller frame 8, the second workpiece 2 is rotated so that each first workpiece 1 to be welded is positioned on one side of the welding torch of the submerged arc welding machine 4 in a "boat-shaped" position, and then welding is performed. Next, the second workpiece 2 is rotated to move another first workpiece 1 in the diameter direction of the welded first workpiece 1 to one side of the welding torch of the submerged arc welding machine 4 in a "boat-shaped" position, and then welding is performed on that first workpiece 1. This effectively reduces residual welding stress. The pair of assembly discs 131 enable precise control of the welding position of the first workpiece 1.

[0029] Specifically, a first rack 11 is fixedly installed on one side of each loop frame 10. Each adjustment assembly 20 includes a rotating shaft 21, a first gear 22, a second gear 23, a second rack 24, and a third rack 25. The first gear 22 is coaxially fixedly installed at one end of the rotating shaft 21, and the second gear 23 is coaxially fixedly installed at the other end of the rotating shaft 21. The second rack 24 is fixedly installed on the upper part of the cooling plate 30, and the third rack 25 is fixedly installed on the lower part of the preheating plate 40. The second rack 24 and the third rack 25 are located above and below the T-shaped frame 12, respectively. The rotating shaft 21 is located on one side of the loop frame 10, and the end of the rotating shaft 21 with the second gear 23 extends into the T-shaped frame 12. The first gear 22 meshes with the first rack 11, and the second gear 23 meshes with both the second rack 24 and the third rack 25.

[0030] Specifically, a first screw 31 is rotatably connected inside the cooling plate 30, a first motor 32 is fixedly installed at one end of the cooling plate 30, the output end of the first motor 32 passes through the cooling plate 30 and is coaxially fixedly connected to the first screw 31, a first slider 33 is threadedly connected to the first screw 31, and the first slider 33 is slidably connected to the inside of the cooling plate 30.

[0031] More specifically, a cooling gun 34 for releasing cold air to the second workpiece 2 is fixedly mounted on the first slider 33.

[0032] Specifically, a second screw 41 is rotatably connected inside the preheating plate 40, a second motor 42 is fixedly installed at one end of the preheating plate 40, the output end of the second motor 42 passes through the preheating plate 40 and is coaxially fixedly connected to the second screw 41, a second slider 43 is threadedly connected to the second screw 41, and the second slider 43 is slidably connected to the inside of the preheating plate 40.

[0033] More specifically, a preheating gun 44 for releasing flames to the second workpiece 2 is fixedly mounted on the second slider 43.

[0034] More specifically, the air-cooling gun 34 is equipped with a fan, and one end of the air-cooling gun 34 is connected to an air source through a gas delivery pipe.

[0035] More specifically, the preheating gun 44 is equipped with a welding torch for heating, and one end of the preheating gun 44 is connected to a combustible gas source (such as propane or acetylene) and an oxygen source (such as compressed air) through a gas delivery pipe.

[0036] Specifically, a filter screen 51 is installed at the top of the recycling bin 5. The recycling bin 5 is used to collect welding flux that falls during submerged arc welding. The welding flux contains reusable components (such as mineral particles and alloying agents). After being collected through the filter screen 51, it can be reused after screening, drying, and other treatments. Furthermore, the falling welding flux easily forms dust or debris, which can be collected centrally by the recycling bin 5, reducing cleaning time. If unrecovered welding flux mixes into subsequent welding areas, it may cause slag inclusions or affect the protection of the molten pool, leading to defects such as porosity and cracks. The recycling bin 5 ensures the cleanliness of the welding area and guarantees weld quality. In automated submerged arc welding, the recycling bin 5 can be linked with the flux delivery device on the submerged arc welding machine 4 to achieve closed-loop control and improve welding consistency.

[0037] Meanwhile, this welding device can also adjust the support height of generator rotors of different sizes by adjusting the height of the roller frame 8, so that generator rotors of different sizes can be at the optimal welding height during welding. The specific operation steps are as follows: when the diameter of the second workpiece 2 increases, the T-shaped frame 12 is driven to descend by the electric push rods 7 on both sides of the recovery box 5. At this time, the two T-shaped frames 12 can simultaneously drive the two roller frames 8 to move downward in the support box 6. The spring 9 under the roller frame 8 provides auxiliary support for the roller frame 8. The second workpiece 2 on the roller frame 8 moves downward a certain distance with the roller frame 8 to ensure that the welding distance between it and the welding torch of the submerged arc welding machine 4 is consistent. At the same time, because the first gear 22 on the T-shaped frame 12 on both sides of the recovery box 5 and the... The first rack 11 on the corresponding position of the loop frame 10 is engaged. During the descent of the T-shaped frame 12, the first gear 22 will rotate and drive the second gear 23 to rotate through the rotating shaft 21. The rotation of the second gear 23 will drive the second rack 24 and the third rack 25 to move away from each other, that is, the cooling plate 30 and the preheating plate 40 will move away from each other to match the diameter of the second workpiece 2. Conversely, when the diameter of the second workpiece 2 decreases, the electric push rods 7 on both sides of the recycling box 5 will drive the T-shaped frame 12 to rise. During the rise of the T-shaped frame 12, the first gear 22 will rotate in the opposite direction and drive the second gear 23 to rotate through the rotating shaft 21. The rotation of the second gear 23 will drive the second rack 24 and the third rack 25 to move closer to each other, that is, the cooling plate 30 and the preheating plate 40 will move closer to each other.

[0038] When the cooling plate 30 is required to work, the first motor 32 reciprocates to drive the first screw 31 to reciprocate, and drives the first slider 33 to reciprocate on the cooling plate 30, so that the air-cooling gun 34 on the first slider 33 can cool the welded joint. The fan in the air-cooling gun 34 forces airflow to accelerate heat dissipation and ensure weld quality and material properties.

[0039] When the preheating plate 40 needs to work, the second motor 42 reciprocates to drive the second screw 41 to reciprocate, and drives the second slider 43 to reciprocate on the preheating plate 40. This allows the preheating gun 44 on the second slider 43 to preheat the joint before welding. The use of gas (such as propane or acetylene) mixed with compressed air to directly heat the surface of the second workpiece 2 through the welding torch in the preheating gun 44 is an important process to ensure welding quality, prevent cracks, and reduce deformation.

[0040] It should be noted that the cooling and preheating processes are not performed simultaneously. This device mainly adjusts the height of the roller frame 8 in advance and the distance between the cooling plate 30 and the preheating plate 40 by adjusting component 20. This is to match the second workpiece 2 of different sizes and facilitate the subsequent preheating and cooling processes. Usually, the preheating process is carried out before the welding process, while the cooling process is carried out after the welding process.

[0041] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0042] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A welding device for a wind turbine rotor, comprising a welding frame (3), characterized in that: It also includes an assembly fixture (13) for assembling a second workpiece (2) and several first workpieces (1), wherein the second workpiece (2) is a wind turbine rotor shaft and the first workpiece (1) is a rib plate installed on the body of the wind turbine rotor shaft; a movable submerged arc welding machine (4) is installed on the welding frame (3), a welding groove is opened through the middle of the welding frame (3), the welding gun of the submerged arc welding machine (4) is located in the welding groove, a recycling box (5) with an upward opening is provided below the welding frame (3), a support box (6) and an electric push rod (7) are provided at both ends of the recycling box (5), a roller frame (8) that can be lifted and lowered is provided in the support box (6), and a loop frame (10) is fixedly installed at both ends of the recycling box (5), and each loop frame (10) can be lifted and lowered and slidably installed. The T-shaped frame (12) is equipped with a fixed connection between the output end of each electric push rod (7) and the T-shaped frame (12) on the same side. Each T-shaped frame (12) is fixedly connected to the roller frame (8) at the same end. Each support box (6) has a sliding groove on one side for the T-shaped frame (12) to move up and down. A cooling plate (30) and a preheating plate (40) are slidably installed in the two T-shaped frames (12). The cooling plate (30) and the preheating plate (40) are symmetrically arranged about the central axis of the T-shaped frame (12). A cooling device for cooling the weld is provided on the cooling plate (30), and a preheating device for heating the weld is provided on the preheating plate (40). Each T-shaped frame (12) is equipped with an adjustment component (20) for adjusting the distance between the cooling plate (30) and the preheating plate (40).

2. The wind turbine rotor welding device according to claim 1, characterized in that: The assembly fixture (13) includes: a pair of assembly plates (131), each assembly plate (131) having an assembly plate through hole (134) in the center, and an assembly fitting (132) connected to the assembly plate through hole (134) on the outer side of each assembly plate (131). Each assembly fitting (132) is coaxial with the corresponding assembly plate through hole (134). Each assembly plate (131) has several assembly slots (133) on its inner side. All the assembly slots (133) on each assembly plate (131) are arranged around the assembly plate through hole (134), and each assembly slot (133) is along the assembly plate (131). 1) Radial arrangement; a pair of assembly discs (131) are respectively fitted and blocked at both ends of the second workpiece (2), and a pair of assembly parts (132) are coaxial with the second workpiece (2). The assembly parts (132) and the body of the second workpiece (2) are fixed by adjusting bolts. Both ends of each first workpiece (1) are locked in the assembly slots (133) of the pair of assembly discs (131). All first workpieces (1) are evenly spaced around the circumference of the second workpiece (2), and the plate of each first workpiece (1) is arranged along the radial direction of the second workpiece (2). Two roller frames (8) are respectively supported at both ends of the second workpiece (2).

3. The wind turbine rotor welding device according to claim 1, characterized in that: Each ring (10) has a first rack (11) fixedly mounted on one side; each adjusting assembly (20) includes a rotating shaft (21), a first gear (22), a second gear (23), a second rack (24), and a third rack (25). The first gear (22) is coaxially fixedly mounted on one end of the rotating shaft (21), the second gear (23) is coaxially fixedly mounted on the other end of the rotating shaft (21), and the second rack (24) is fixedly mounted on the upper part of the cooling plate (30). The rack (25) is fixedly installed on the lower part of the preheating plate (40). The second rack (24) and the third rack (25) are located above and below the T-shaped frame (12) respectively. The rotating shaft (21) is located on one side of the U-shaped frame (10). One end of the rotating shaft (21) with the second gear (23) extends into the T-shaped frame (12). The first gear (22) meshes with the first rack (11), and the second gear (23) meshes with both the second rack (24) and the third rack (25).

4. The wind turbine rotor welding device according to claim 1, characterized in that: The cooling device includes: a first screw (31) rotatably connected inside the cooling plate (30); a first motor (32) fixedly installed at one end of the cooling plate (30); the output end of the first motor (32) passes through the cooling plate (30) and is coaxially fixedly connected to the first screw (31); a first slider (33) is threadedly connected to the first screw (31); and the first slider (33) is slidably connected to the interior of the cooling plate (30); and an air-cooling gun (34) for releasing cold air to the second workpiece (2) is fixedly installed on the first slider (33).

5. The wind turbine rotor welding device according to claim 4, characterized in that, The air-cooled gun (34) is equipped with a fan, and one end of the air-cooled gun (34) is connected to an air source through a gas delivery pipe.

6. The wind turbine rotor welding device according to claim 1, characterized in that: The preheating device includes: a second screw (41) rotatably connected inside the preheating plate (40); a second motor (42) fixedly installed at one end of the preheating plate (40); the output end of the second motor (42) passes through the preheating plate (40) and is coaxially fixedly connected to the second screw (41); a second slider (43) is threadedly connected to the second screw (41); and the second slider (43) is slidably connected to the inside of the preheating plate (40); a preheating gun (44) for releasing flames to the second workpiece (2) is fixedly installed on the second slider (43).

7. The wind turbine rotor welding device according to claim 6, characterized in that: The preheating gun (44) is equipped with a welding torch for heating, and one end of the preheating gun (44) is connected to a combustible gas source and an oxygen source through a gas delivery pipe.

8. The wind turbine rotor welding device according to claim 1, characterized in that: A filter screen (51) is provided at the upper end of the recycling bin (5).

9. The wind turbine rotor welding device according to claim 1, characterized in that: A spring (9) is provided between the roller frame (8) and the support box (6).

Images