Hot melting milling device and method for wind turbine blade surface material reduction operation

Abstract

The invention discloses a hot melting milling device for wind turbine blade surface material reduction operation, which comprises a shell, the bottom of the shell is connected with a forward milling cutter and a reverse milling cutter, the forward milling cutter and the reverse milling cutter are sequentially mounted in a staggered manner, the tops of the forward milling cutter and the reverse milling cutter are connected with a milling cutter support plate, and the upper end face of the milling cutter support plate is provided with a function plate; the forward milling cutter and the reverse milling cutter are connected with drill bit motors, the tops of the multiple drill bit motors are connected with a motor fixing plate through bolts, driving units are installed on the two symmetrical side walls of the shell, and the motor fixing plate, the function plate and the milling cutter supporting plate are all located in the shell. The invention further discloses a hot melting milling method for the wind turbine blade surface material reduction operation. According to the hot melting milling device and method for the wind turbine blade surface material reduction operation, the forward rotation cutting edge and the reverse rotation cutting edge are arranged in a staggered mode, the reverse torque generated by the forward rotation cutting edge and the torque generated by the reverse rotation cutting edge can be counteracted when the device works, and therefore the stability of the device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind turbine blade maintenance devices, and in particular relates to a hot melt milling device for wind turbine blade surface material reduction operations, and also relates to a hot melt milling method for wind turbine blade surface material reduction operations. Background Art

[0002] As the operation time of wind turbines accumulates and prolongs, the surface of the blades is damaged by severe weather such as heavy rain, lightning, snow, hail, etc., resulting in cracks, bulges, breakage, bumps, and corrosion and blackening on the surface. At present, the maintenance of wind turbine blades is carried out through the process of surface defect removal, material filling and solidification. Among them, the surface defect removal of materials mostly uses grinders or angle grinders to dig the damaged area until the cracks or bulges disappear on the surface, and then the excavated part is backfilled, solidified, and subsequently polished. The use of conventional grinding devices such as files, grinders, and angle grinders has the disadvantages of low work efficiency, heavy transportation weight and inconvenience in carrying due to the carrying of multiple tools. In addition, wind turbines are generally installed in places with strong winds. When cracks appear on the surface of the blades, they are large in size and deep in depth. The maintenance process relies on lifting ropes to lift the staff to the designated location for operation. Long-term grinding work increases the time that personnel are suspended, and the potential risk factor also doubles. In addition, equipment such as grinders and angle grinders will generate a large amount of fine dust particles during work, which can also cause great harm to the workers' bodies if inhaled into the nasal cavity. Summary of the invention

[0003] The first purpose of the present invention is to provide a hot melt milling device for wind turbine blade surface material reduction operations, so as to solve the problem of low efficiency caused by the large number of maintenance equipment required when cracks appear on the blade surface in the prior art.

[0004] A second object of the present invention is to provide a hot melt milling method for reducing material on the surface of a wind turbine blade.

[0005] The first technical solution adopted by the present invention is to include a shell, a plurality of forward milling cutters and reverse milling cutters are connected to the bottom of the shell, the forward milling cutters and the reverse milling cutters are installed in sequence, the tops of the forward milling cutters and the reverse milling cutters are commonly connected to a milling cutter support plate, a function plate is provided on the upper end surface of the milling cutter support plate, the forward milling cutters and the reverse milling cutters penetrate the milling cutter support plate and the function plate is connected to a drill motor, the tops of the plurality of drill motors are connected to a motor fixing plate by bolts, drive units are installed on the symmetrical two side walls of the shell, the motor fixing plate, the function plate and the milling cutter support plate are all located inside the shell.

[0006] The first technical solution of the present invention is also characterized in that: A motor slot is also provided on the motor fixing plate, a fan motor is installed in the motor slot, and a fan sheet is connected to the output shaft of the fan motor.

[0007] A ventilation hole is provided on the side wall of the shell close to the fan blade, and an oblique air outlet is provided on the milling cutter support plate.

[0008] A through hole is provided at the bottom of the milling cutter support plate. Both the forward milling cutter and the reverse milling cutter are provided with a tool handle rotating shaft. Concentric rings are provided on the outside of the tool handle rotating shaft. A hollow groove is formed between the tool handle rotating shaft and the inner ring. The outer diameter of the outer ring matches the outer diameter of the through hole at the bottom of the milling cutter support plate.

[0009] A fan hole and a coil hole are provided on the function board. Two hard wires are provided in the coil hole. A column wire connected to the hard wire is provided in the coil hole. The column wire is located on the lower end surface of the function board. An electromagnetic coil is wound around the end of the column wire. The electromagnetic coil passes through the tool handle rotating axis and is suspended inside the forward milling cutter and the reverse milling cutter.

[0010] The driving unit includes multiple support legs, each of which has two cylindrical holes. Support columns are inserted into the cylindrical holes. A round buckle is welded to one end of the support column close to the outer shell. The other ends of the multiple support columns are connected to a bracket. The bracket is provided with multiple circular shafts, each of which has a roller passing through a bearing opening, and rubber tracks are installed on the outer walls of the multiple rollers.

[0011] A through hole matching the outer diameter of the inner ring is provided on the functional plate.

[0012] The support column sleeve is provided with a support spring.

[0013] The upper end surface of the shell is connected with a handle.

[0014] The second technical solution adopted by the present invention is a hot melt milling method for reducing material on the surface of wind turbine blades. The specific steps are: first, clean and plan the path of the cracked areas on the surface of the wind turbine blades, then start the hot melt milling device switch, first let the alternating current flow through the electromagnetic coil, and heat the forward milling cutter and the reverse milling cutter through the eddy current effect. After heating, the milling cutter is driven to rotate through the rotating shaft of the handle, and the fan motor is turned on to fit the rubber track to the blade surface. The drill blade of the milling cutter head drills first, and the debris flows out along the blade's turning track and is blown away by the fan blade. Then the rubber track is slowly pushed forward. At this time, the milling cutter changes from drilling cutting to milling cutting of the side blade. After the crack surface needs to be eliminated according to the predetermined track, until there is no crack on the blade surface, the surface repair of the wind turbine blade is completed.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The hot melt milling device and method for reducing the material on the surface of a wind turbine blade provided by the present invention are provided with a fan blowing function, which can blow away the milling debris on the tool and cool the surface of the cut material.

[0016] (2) The hot melt milling device and method for reducing material on the surface of a wind turbine blade provided by the present invention are provided with stabilizing legs, which can make the device more stable during operation and the cutting trajectory more stable, thereby protecting the milling cutter.

[0017] (3) The hot melt milling device and method for reducing material on the surface of wind turbine blades provided by the present invention adopt a four-wheel crawler design. The surface of the fan blade is an arc-shaped structure. The four-wheel crawler allows the device to better fit the blade surface and move.

[0018] (4) The hot melt milling device and method for wind turbine blade surface material reduction provided by the present invention respectively adopts staggered arrangement of forward and reverse rotating blades. When the device is working, the reverse torque generated by the forward rotating blade can offset the torque generated by the reverse rotating blade, thereby improving the stability of the device. In addition, by staggered placement of the cutting tools, the cutting tools can operate simultaneously and cut separately, thereby achieving high-speed operation.

[0019] (5) The hot melt milling device and method for wind turbine blade surface material reduction provided by the present invention adopts an electromagnetic coil to heat the tool, which not only cleverly combines the advantages of hot melt cutting and milling processes, but also separates the tool from the power supply wire during operation, thereby reducing unnecessary friction of the tool, and utilizes the rotation of the tool to generate heat.

[0020] (6) The hot melt milling device and method for reducing the material on the surface of a wind turbine blade provided by the present invention can increase the friction between the device and the blade through the combination of a rubber track and a support spring. The spring can provide a relatively stable downward force and provide a buffer when the blade vibrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a hot melt milling device for reducing material on the surface of a wind turbine blade according to the present invention; Figure 2 It is a side view schematic diagram of a hot melt milling device for reducing material on the surface of a wind turbine blade according to the present invention; Figure 3 It is a top view schematic diagram of a hot melt milling device for reducing material on the surface of a wind turbine blade according to the present invention; Figure 4 It is a schematic diagram of the structure of the support of the present invention; Figure 5 It is a structural schematic diagram of the roller of the present invention; Figure 6 It is a schematic diagram of the installation of the milling cutter and the fan motor of the present invention; Figure 7 It is a schematic diagram of the installation of the conductor and the fan sheet of the present invention.

[0022] In the figure, 1. handle; 2. housing; 3. motor fixing plate; 4. bolt; 5. drill motor; 6. ventilation hole; 7. function board; 8. forward milling cutter; 9. reverse milling cutter; 10. rubber track; 11. bracket; 1101 round shaft; 12. roller; 1201. bearing mouth; 13. milling cutter support plate; 14. support column; 15. support spring; 16. round buckle; 17. support foot; 1701. cylindrical hole; 18. motor slot; 19. fan motor; 20. fan blade; 21. fan hole; 22. hard wire; 23. coil hole; 24. column wire; 25 electromagnetic coil; 26. hollow slot; 27. handle rotating axis; 28. air outlet. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 The hot melt milling device provided by the present invention for the surface reduction of wind turbine blades is as follows: Figure 1-3 As shown, it includes a shell 2, a plurality of forward milling cutters 8 and reverse milling cutters 9 are connected to the bottom of the shell 2, the forward milling cutters 8 and the reverse milling cutters 9 are installed in sequence, and the tops of the forward milling cutters 8 and the reverse milling cutters 9 are commonly connected to a milling cutter support plate 13, and the upper end surface of the milling cutter support plate 13 is provided with a functional plate 7, the forward milling cutters 8 and the reverse milling cutters 9 penetrate the milling cutter support plate 13 and are connected to the functional plate 7 with a drill motor 5, the tops of the plurality of drill motors 5 are connected to a motor fixing plate 3 by bolts 4, and drive units are installed on the symmetrical two side walls of the shell 2, and the motor fixing plate 3, the functional plate 7 and the milling cutter support plate 13 are all located inside the shell 2.

[0025] Example 2 The hot melt milling device provided in this embodiment for the surface reduction operation of a wind turbine blade is as follows: Figure 1-7 As shown, it includes a shell 2, a plurality of forward milling cutters 8 and reverse milling cutters 9 are connected to the bottom of the shell 2, the forward milling cutters 8 and the reverse milling cutters 9 are installed in sequence, and the tops of the forward milling cutters 8 and the reverse milling cutters 9 are commonly connected to a milling cutter support plate 13, and a function plate 7 is provided on the upper end surface of the milling cutter support plate 13. The forward milling cutters 8 and the reverse milling cutters 9 penetrate the milling cutter support plate 13 and are connected to a drill motor 5 on the function plate 7, and the tops of the plurality of drill motors 5 are connected to a motor fixing plate 3 by bolts 4, and drive units are installed on the symmetrical side walls of the shell 2, and the motor fixing plate 3, the function plate 7 and the milling cutter support plate 13 are all located inside the shell 2; a motor slot 18 is also provided on the motor fixing plate 3, a fan motor 19 is installed in the motor slot 18, and a fan blade 20 is connected to the output shaft of the fan motor 19; a ventilation hole 6 is provided on the side wall of the shell 2 close to the fan blade 20, and an oblique air outlet 28 is provided on the milling cutter support plate 13.

[0026] Example 3 The hot melt milling device provided in this embodiment for the surface reduction operation of a wind turbine blade is as follows: Figure 1-7 As shown, it includes a shell 2, a plurality of forward milling cutters 8 and reverse milling cutters 9 are connected to the bottom of the shell 2, the forward milling cutters 8 and the reverse milling cutters 9 are installed in sequence, and the tops of the forward milling cutters 8 and the reverse milling cutters 9 are commonly connected to a milling cutter support plate 13, and a function plate 7 is provided on the upper end surface of the milling cutter support plate 13. The forward milling cutters 8 and the reverse milling cutters 9 penetrate the milling cutter support plate 13 and are connected to a drill motor 5 on the function plate 7. The tops of the plurality of drill motors 5 are connected to a motor fixing plate 3 by bolts 4. Drive units are installed on the symmetrical two side walls of the shell 2, and the motor fixing plate 3, the function plate 7 and the milling cutter support plate 13 are all located inside the shell 2; the motor fixing plate 3 is also provided with a function plate 7. A motor slot 18 is provided, in which a fan motor 19 is installed, and a fan sheet 20 is connected to the output shaft of the fan motor 19; a ventilation hole 6 is provided on the side wall of the outer casing 2 near the fan sheet 20, an inclined air outlet 28 is provided on the milling cutter support plate 13, and a through hole is provided at the bottom of the milling cutter support plate 13; a handle rotating shaft 27 is provided in both the forward milling cutter 8 and the reverse milling cutter 9, and concentric rings are provided on the outside of the handle rotating shaft 27, and a hollow groove 26 is formed between the handle rotating shaft 27 and the inner ring, and the outer diameter of the outer ring matches the outer diameter of the through hole at the bottom of the milling cutter support plate 13, and a through hole matching the outer diameter of the inner ring is provided on the function plate 7.

[0027] Example 4 The hot melt milling device provided in this embodiment for the surface reduction operation of a wind turbine blade is as follows: Figure 1-7As shown, it includes a shell 2, a plurality of forward milling cutters 8 and reverse milling cutters 9 are connected to the bottom of the shell 2, the forward milling cutters 8 and the reverse milling cutters 9 are installed in sequence, and the tops of the forward milling cutters 8 and the reverse milling cutters 9 are commonly connected to a milling cutter support plate 13, and a function plate 7 is provided on the upper end surface of the milling cutter support plate 13. The forward milling cutters 8 and the reverse milling cutters 9 penetrate the milling cutter support plate 13 and are connected to a drill motor 5 on the function plate 7. The tops of the plurality of drill motors 5 are connected to a motor fixing plate 3 by bolts 4. The driving units are installed on the symmetrical side walls of the shell 2, and the motor fixing plate 3, the function plate 7 and the milling cutter support plate 13 are all located inside the shell 2; a motor slot 18 is also provided on the motor fixing plate 3, a fan motor 19 is installed in the motor slot 18, and a fan sheet 20 is connected to the output shaft of the fan motor 19; a ventilation hole 6 is provided on the side wall of the shell 2 close to the fan sheet 20, and the milling cutter support plate 1 3 is provided with an oblique vertical air outlet 28, a through hole is provided at the bottom of the milling cutter support plate 13, a handle rotating shaft 27 is provided in both the forward milling cutter 8 and the reverse milling cutter 9, a concentric ring is provided on the outer side of the handle rotating shaft 27, a hollow groove 26 is formed between the handle rotating shaft 27 and the inner ring, the outer diameter of the outer ring matches the outer diameter of the through hole at the bottom of the milling cutter support plate 13, and a through hole matching the outer diameter of the inner ring is provided on the function board 7; a fan hole 21 and a coil hole 23 are provided on the function board 7, two hard wires 22 are provided in the coil hole 23, a column wire 24 connected to the hard wire 22 is provided in the coil hole 23, the column wire 24 is located at the lower end surface of the function board 7, an electromagnetic coil 25 is wound at the end of the column wire 24, and the electromagnetic coil 25 passes through the handle rotating shaft 27 and is suspended inside the forward milling cutter 8 and the reverse milling cutter 9; a handle 1 is connected to the upper end surface of the housing 2.

[0028] Example 5 The hot melt milling device provided in this embodiment for the surface reduction operation of a wind turbine blade is as follows: Figure 1-7As shown, it includes a shell 2, a plurality of forward milling cutters 8 and reverse milling cutters 9 are connected to the bottom of the shell 2, the forward milling cutters 8 and the reverse milling cutters 9 are installed in sequence, the tops of the forward milling cutters 8 and the reverse milling cutters 9 are commonly connected to a milling cutter support plate 13, the upper end surface of the milling cutter support plate 13 is provided with a function plate 7, the forward milling cutters 8 and the reverse milling cutters 9 penetrate the milling cutter support plate 13 and the function plate 7 are connected to a drill motor 5, the tops of the plurality of drill motors 5 are connected to a motor fixing plate 3 by bolts 4, the symmetrical two side walls of the shell 2 are installed with drive units, the motor fixing plate 3, the function plate 7, the motor fixing plate 3 ... The plate 7 and the milling cutter support plate 13 are both located inside the housing 2; a motor slot 18 is also provided on the motor fixing plate 3, a fan motor 19 is installed in the motor slot 18, and a fan sheet 20 is connected to the output shaft of the fan motor 19; a ventilation hole 6 is provided on the side wall of the housing 2 near the fan sheet 20, an oblique vertical air outlet 28 is provided on the milling cutter support plate 13, a through hole is provided at the bottom of the milling cutter support plate 13, a tool handle rotating shaft 27 is provided in both the forward milling cutter 8 and the reverse milling cutter 9, a concentric ring is provided on the outer side of the tool handle rotating shaft 27, and the tool handle rotating shaft 27 and the inner ring are connected. A hollow groove 26 is formed, the outer diameter of the outer ring matches the outer diameter of the through hole at the bottom of the milling cutter support plate 13, and a through hole matching the outer diameter of the inner ring is opened on the function plate 7; a fan hole 21 and a coil hole 23 are opened on the function plate 7, two hard wires 22 are arranged in the coil hole 23, and a column wire 24 connected to the hard wire 22 is arranged in the coil hole 23, and the column wire 24 is located at the lower end surface of the function plate 7, and an electromagnetic coil 25 is wound at the end of the column wire 24, and the electromagnetic coil 25 passes through the tool handle rotating shaft 27 and is suspended on the forward milling cutter 8 and the reverse milling cutter 9 interior; the handle 1 is connected to the upper end surface of the shell 2; the driving unit includes a plurality of legs 17, the legs 17 are provided with two cylindrical holes 1701, a support column 14 is passed through the cylindrical hole 1701, a round buckle 16 is welded to one end of the support column 14 close to the shell 2, and the other ends of the plurality of support columns 14 are connected to a bracket 11, the bracket 11 is provided with a plurality of circular shafts 1101, each circular shaft 1101 is penetrated by a roller 12 through a bearing opening 1201, and a plurality of rollers 12 are installed with rubber tracks 10 on their outer walls; the support column 14 is sleeved with a support spring 15.

[0029] Example 6 This embodiment provides a hot melt milling method for wind turbine blade surface reduction operation, using the hot melt milling device for wind turbine blade surface reduction operation provided by the above embodiment, the specific steps are: the staff first cleans and plans the path of the cracked area on the wind turbine blade surface, and then starts the hot melt milling device switch, first allows the alternating current to flow through the coil, heats the milling cutter through the eddy current effect, starts the milling cutter to rotate, turns on the fan motor, and then presses the device to the place where grinding is required. The crawler is attached to the blade surface, the drill blade of the cutter head drills first, the debris flows out along the blade's turn track, is blown away by the fan, and then slowly pushes the device forward, the crawler continues to adhere to the blade surface to provide stable grinding conditions for the device, at this time the tool changes from drilling cutting to milling cutting of the side blade, after walking along the predetermined track to eliminate the cracked surface, observe whether the blade still has cracks, if so, repeat the above steps until no cracks can be seen on the blade surface, perform raw material filling, solidification and grinding operations, and finally complete the wind turbine blade surface repair. Example 7 This embodiment provides a hot melt milling device and method for wind turbine blade surface reduction operation, such as Figure 1-7 As shown, multiple milling cutters can be started synchronously, and the milling cutters are staggered in the repeated order of forward milling cutter and reverse milling cutter. During operation, after the first milling cutter cuts, it is continuously cut by the second milling cutter, and so on, so that the purpose of multi-faceted milling cutters can work simultaneously is achieved, thereby improving work efficiency, and the reverse torques generated by the forward and reverse rotation of the cutters can offset each other, thereby achieving stable operation of the mechanism; at the same time, the milling cutter head is similar to the drill head and can be used for drilling. The middle end of the shank is connected to the milling cutter support plate 13 through a groove to provide a fixed rotation point, and the end of the shank cooperates with the through hole on the function plate 7 to provide a second rotation fixed The electromagnetic coil 25 is energized at a fixed point, and two hard wires 22 are embedded in the coil hole 23 of the middle functional board 7. The hard wire 22 can not only energize the electromagnetic coil 25, but also firmly fix the coil through the column wire 24. The center of the milling cutter has a deep annular groove called a hollow groove 26. The function of the hollow groove 26 is to allow the electromagnetic coil 25 to hang inside the milling cutter. The handle rotating shaft 27 is in the middle of the handle ring, which is connected to the end of the rotating shaft of the drill motor 5 to provide power for the rotation of the tool. When the tool is running, the electromagnetic coil is passed through an alternating current, which can generate eddy currents inside the blade and quickly generate heat, thereby reaching the required cutting temperature.

[0030] Furthermore, the drill motor 5 is fixed to the motor fixing plate 3 by means of bolts. The motor slot 18 provided on the motor fixing plate 3 is used to install the fan motor 19. The end of the shaft of the fan motor 19 is connected to the fan sheet 20. The fan sheet 20 cooperates with the fan hole 21 on the function plate 7 to form a closed blowing channel. The air enters from the ventilation hole 6 of the outer shell, is blown out from the inclined air outlet 28 on the milling cutter support plate 13, and finally blows onto the blade of the milling cutter and the surface of the material, which not only blows away the debris remaining on the blade, but also cools the surface of the material so that the next tool will not be stuck when cutting.

[0031] Furthermore, the motor fixing plate 3, the function plate 7 and the milling cutter support plate 13 are fixed to the middle inner part of the shell by welding. The upper end of the shell 2 is provided with a handle 1 for the staff to grasp and control the machine. The two sides near the fan in the middle are designed with ventilation holes 6. The two horizontal sides of the lower end are welded with support legs 17. The cylindrical hole 1701 on the support leg 17 is used to install the support column 14. A round buckle 16 is welded at the upper end of the support column 14 to clamp the support column to prevent it from being separated from the support leg 17. The lower end is connected to the bracket 11. The support column 14 is mainly used to withstand the force generated laterally by the device, and between the bracket 11 and the support leg 17, there is a support spring 15 as a vertical force-bearing member; Furthermore, a circular shaft 1101 is provided laterally on the bracket 11, passing through the bearing opening 1201 and penetrating the roller 12. A rubber track 10 is provided on the outer side of the roller 12. The high friction coefficient of the rubber track 10 cooperates with parts such as the support foot 17 to form a stabilizing member, which is respectively assembled at four positions of the outer shell to improve the overall operation stability.

[0032] Furthermore, the ventilation holes 6 are located between the motor fixing plate 3 and the upper end surface of the inner part of the housing, and between the motor fixing plate 3 and the functional plate 7 .

Claims

1. A hot melt milling device for reducing the material on the surface of a wind turbine blade, characterized in that: The invention comprises a shell (2), wherein a plurality of forward-rotating milling cutters (8) and reverse-rotating milling cutters (9) are connected to the bottom of the shell (2), wherein the forward-rotating milling cutters (8) and reverse-rotating milling cutters (9) are installed in a staggered manner in sequence, wherein the tops of the forward-rotating milling cutters (8) and reverse-rotating milling cutters (9) are connected to a milling cutter support plate (13), wherein a function plate (7) is provided on the upper end surface of the milling cutter support plate (13), wherein the forward-rotating milling cutters (8) and reverse-rotating milling cutters (9) penetrate the milling cutter support plate (13) and the function plate (7), and are connected to a drill motor (5), wherein the tops of the plurality of drill motors (5) are connected to a motor fixing plate (3) via bolts (4), wherein drive units are installed on two symmetrical side walls of the shell (2), and wherein the motor fixing plate (3), the function plate (7) and the milling cutter support plate (13) are all located inside the shell (2).

2. The hot melt milling device for wind turbine blade surface reduction operation according to claim 1 is characterized in that: The motor fixing plate (3) is also provided with a motor slot (18), a fan motor (19) is installed in the motor slot (18), and a fan sheet (20) is connected to the output shaft of the fan motor (19).

3. The hot melt milling device for wind turbine blade surface reduction operation according to claim 2 is characterized in that: A ventilation hole (6) is provided on the side wall of the housing (2) close to the fan blade (20), and an oblique air outlet (28) is provided on the milling cutter support plate (13).

4. The hot melt milling device for wind turbine blade surface reduction operation according to claim 3 is characterized in that: A through hole is provided at the bottom of the milling cutter support plate (13); a tool handle rotating shaft (27) is provided inside the forward-rotating milling cutter (8) and the reverse-rotating milling cutter (9); a concentric ring is provided outside the tool handle rotating shaft (27); a hollow groove (26) is formed between the tool handle rotating shaft (27) and the inner ring; and the outer diameter of the outer ring matches the outer diameter of the through hole at the bottom of the milling cutter support plate (13).

5. The hot melt milling device for reducing the material on the surface of a wind turbine blade according to claim 4 is characterized in that: The function board (7) is provided with a fan hole (21) and a coil hole (23), two hard wires (22) are arranged in the coil hole (23), and the coil hole (23) is provided with a column wire (24) connected to the hard wire (22), the column wire (24) is located at the lower end surface of the function board (7), and an electromagnetic coil (25) is wound around the end of the column wire (24), and the electromagnetic coil (25) passes through the tool handle rotating shaft (27) and is suspended inside the forward milling cutter (8) and the reverse milling cutter (9).

6. The hot melt milling device for reducing the material on the surface of a wind turbine blade according to claim 5 is characterized in that: The driving unit comprises a plurality of support legs (17), the support legs (17) being provided with two cylindrical holes (1701), a support column (14) being inserted into the cylindrical hole (1701), a round buckle (16) being welded to one end of the support column (14) close to the housing (2), the other ends of the plurality of support columns (14) being connected to a bracket (11), the bracket (11) being provided with a plurality of circular shafts (1101), each of the circular shafts (1101) being passed through a roller (12) via a bearing opening (1201), and the outer walls of the plurality of rollers (12) being provided with rubber tracks (10).

7. The hot melt milling device for wind turbine blade surface reduction operation according to claim 6 is characterized in that: The functional plate (7) is provided with a through hole matching the outer diameter of the inner ring.

8. The hot melt milling device for wind turbine blade surface reduction operation according to claim 6 is characterized in that: The support column (14) is sleeved with a support spring (15).

9. The hot melt milling device for wind turbine blade surface reduction operation according to claim 1, characterized in that: The upper end surface of the housing (2) is connected to a handle (1).

10. A hot melt milling method for reducing the material on the surface of a wind turbine blade, characterized in that: The hot melt milling device for wind turbine blade surface reduction operation as claimed in claim 6 is used, and the specific steps are as follows: first, the cracked area on the wind turbine blade surface is cleaned and the path is planned, and then the hot melt milling device switch is turned on, and the alternating current is first allowed to flow through the electromagnetic coil (25), and the forward milling cutter (8) and the reverse milling cutter (9) are heated by the eddy current effect. After heating, the milling cutter is driven to rotate by the handle rotating shaft (27), and the fan motor (19) is turned on to fit the rubber track (10) to the blade surface. The drill blade of the milling cutter head drills first, and the debris flows out along the blade's turning track and is blown away by the fan blade (20), and then the rubber track (10) is slowly pushed forward. At this time, the milling cutter changes from drilling cutting to milling cutting of the side blade, and the crack surface that needs to be eliminated according to the predetermined track is eliminated until there is no crack on the blade surface, and the wind turbine blade surface repair is completed.

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