Hot melt milling device and method for wind turbine blade surface subtractive operations

Abstract

The hot melting milling device for the wind turbine blade surface subtractive operation disclosed by the application comprises a shell, a forward rotating milling cutter and a reverse rotating milling cutter are connected to the bottom of the shell, the forward rotating milling cutter and the reverse rotating milling cutter are sequentially and staggeredly installed, the top of the forward rotating milling cutter and the reverse rotating milling cutter is connected with a milling cutter support plate, a functional plate is arranged on the upper end surface of the milling cutter support plate, a drill bit motor is connected to the forward rotating milling cutter and the reverse rotating milling cutter, a plurality of drill bit motors are connected with a motor fixing plate through bolts on the top, drive units are installed on the two symmetrical side walls of the shell, and the motor fixing plate, the functional plate and the milling cutter support plate are all located inside the shell. The application further discloses a hot melting milling method for the wind turbine blade surface subtractive operation. The hot melting milling device and method for the wind turbine blade surface subtractive operation disclosed by the application adopt staggered arrangement of forward rotating and reverse rotating cutting edges, and the reverse torque generated by the forward rotating cutting edge and the torque generated by the reverse rotating cutting edge can be offset to each other when the device works, so that the stability of the device is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wind turbine blade maintenance device, and particularly relates to a hot melting milling device for wind turbine blade surface subtractive operation, and also relates to a hot melting milling method for wind turbine blade surface subtractive operation. BACKGROUND

[0002] With the accumulation of wind turbine operation time, the blade surface is damaged by heavy rain, lightning, snow, hail and other bad weather, resulting in phenomena such as surface cracks, bulges, damage, concave-convex and corrosion blackening. At present, the wind turbine blade maintenance is carried out by removing the surface defects, material filling and solidification process. The surface defect removal of the material is usually carried out by using a grinder or an angle grinder to dig the damaged part until the surface cracks or bulges disappear, and then the dug part is backfilled, solidified and subsequently ground. The use of conventional grinding devices such as a file, a grinder and an angle grinder has the disadvantages of low work efficiency, heavy transportation weight and inconvenience caused by carrying multiple tools. Moreover, the wind turbine is usually installed in a place with strong wind, and when the blade surface cracks, it has the characteristics of large size and deep cracks. The repair process relies on a lifting rope to lift the workers to the designated position for operation. Long-time grinding work increases the time of being lifted, and the potential risk coefficient is also multiplied. In addition, the grinder and the angle grinder generate a large amount of fine dust particles during work, which is also harmful to the workers when inhaled into the nasal cavity. SUMMARY

[0003] The first object of the present application is to provide a hot melting milling device for wind turbine blade surface subtractive operation, which solves the problem of low efficiency caused by the need for more maintenance equipment when the blade surface cracks in the prior art.

[0004] The second object of the present application is to provide a hot melting milling method for wind turbine blade surface subtractive operation.

[0005] The first technical solution adopted by the present application is a hot melting milling device for wind turbine blade surface subtractive operation, which comprises an outer shell, a plurality of forward milling cutters and reverse milling cutters connected to the bottom of the outer shell, the forward milling cutters and the reverse milling cutters being installed in sequence and staggered, a milling cutter support plate connected to the top of the forward milling cutters and the reverse milling cutters, a functional plate provided on the upper end surface of the milling cutter support plate, a drill motor connected to the milling cutter support plate and the functional plate through the milling cutter support plate, a motor fixing plate connected to the top of the plurality of drill motors through bolts, a driving unit installed on the two opposite side walls of the outer shell, and the motor fixing plate, the functional plate and the milling cutter support plate being located inside the outer shell.

[0006] The first technical solution of the present application is characterized in that

[0007] A motor groove is further formed in the motor fixing plate, a fan motor is installed in the motor groove, and a fan blade is connected to the output shaft of the fan motor.

[0008] The side wall of the shell near the fan blade is provided with a ventilation hole, and the milling cutter support plate is provided with an inclined air outlet.

[0009] The bottom of the milling cutter support plate is provided with a through hole, the positive milling cutter and the reverse milling cutter are both provided with a cutter handle rotating shaft, the outer side of the cutter handle rotating shaft is provided with a concentric ring, the cutter handle rotating shaft and the inner ring form a hollow groove, 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.

[0010] The function plate is provided with a fan hole and a coil hole, two hard wires are arranged in the coil hole, the coil hole is provided with a stand column wire connected with the hard wires, the stand column wire is located at the lower end surface of the function plate, an electromagnetic coil is wound at the end of the stand column wire, and the electromagnetic coil is hung in the positive milling cutter and the reverse milling cutter through the cutter handle rotating shaft.

[0011] The driving unit comprises a plurality of supporting legs, two cylindrical holes are formed in the supporting legs, supporting columns are arranged in the cylindrical holes, a round buckle is welded at one end of the supporting column close to the shell, the other end of the plurality of supporting columns is connected with a support, a plurality of circular shafts are arranged on the support, a roller is penetrated through the bearing hole of each circular shaft, and rubber tracks are arranged on the outer walls of the plurality of rollers.

[0012] The function plate is provided with a through hole matching the outer diameter of the inner ring.

[0013] The supporting column is sleeved with a supporting spring.

[0014] The upper end surface of the shell is connected with a handle.

[0015] The second technical scheme of the present application is a hot melting milling method for the subtractive operation of the surface of a wind turbine blade, and the specific steps are as follows: firstly, the places where cracks appear on the surface of the wind turbine blade are cleaned and path planning is performed, then the hot melting milling device switch is started, the alternating current is first allowed to wander in the electromagnetic coil, the positive milling cutter and the reverse milling cutter are heated through the eddy current effect, the milling cutter is rotated through the cutter handle rotating shaft after heating, the rubber track is adhered to the surface of the blade by turning on the fan motor, the drill bit of the milling cutter head first drills, the chippings flow out along the turning track of the blade, and the chippings are 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, and after the cracks on the surface are eliminated according to the predetermined track, the surface of the blade is free of cracks, and the surface repair of the wind turbine blade is completed.

[0016] Compared with the prior art, the present application has the following advantages:

[0017] (1) The hot melting milling device and method for the subtractive operation of the surface of a wind turbine blade provided by the present application adds a fan blowing function, so that the chippings milled by the cutter can be blown away, and the surface of the material to be cut can be cooled.

[0018] (2) The hot melting milling device and method for the wind turbine blade surface subtractive operation provided by the application, the additional stabilizing support foot can make the device more stable during work and the cutting track more stable, thereby protecting the milling cutter.

[0019] (3) The hot melting milling device and method for the wind turbine blade surface subtractive operation provided by the application adopts the design of four-wheel caterpillar belts, the fan blade surface is an arc structure, and the four-wheel caterpillar belts can make the device better adhere to the blade surface and move.

[0020] (4) The hot melting milling device and method for the wind turbine blade surface subtractive operation provided by the application respectively adopt the staggered arrangement of the forward rotating and reverse rotating cutter edges, the reverse torque generated by the forward rotating cutter edge during the work of the device can be offset by the torque generated by the reverse rotating cutter edge, thereby improving the stability of the device. And through the staggered placement of the cutter, the cutter simultaneously operates and is cut respectively, thereby realizing high-speed operation.

[0021] (5) The hot melting milling device and method for the wind turbine blade surface subtractive operation provided by the application adopts the form of the electromagnetic coil to heat the cutter, which ingeniously combines the advantages of hot melting cutting and milling processes, separates the cutter from the power supply wire during operation, reduces unnecessary friction of the cutter, and utilizes the self-rotation of the cutter to generate heat.

[0022] (6) The hot melting milling device and method for the wind turbine blade surface subtractive operation provided by the application combines the rubber caterpillar belt and the supporting spring, the rubber caterpillar belt can increase the friction force between the device and the blade, the spring can provide relatively stable pressing force, and provides buffering when the blade vibrates. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the hot melting milling device for the wind turbine blade surface subtractive operation of the application;

[0024] Figure 2 is a side view schematic view of the hot melting milling device for the wind turbine blade surface subtractive operation of the application;

[0025] Figure 3 is a top view schematic view of the hot melting milling device for the wind turbine blade surface subtractive operation of the application;

[0026] Figure 4 is a structural schematic view of the support of the application;

[0027] Figure 5 is a structural schematic view of the roller of the application;

[0028] Figure 6 is an installation schematic view of the milling cutter and the fan motor of the application;

[0029] Figure 7 This is a schematic diagram of the installation of the wires and fan blades of the present invention.

[0030] In the diagram: 1. Handle; 2. Housing; 3. Motor mounting plate; 4. Bolt; 5. Drill motor; 6. Ventilation hole; 7. Functional plate; 8. Forward milling cutter; 9. Reverse milling cutter; 10. Rubber track; 11. Bracket; 1101 Round shaft; 12. Roller; 1201 Bearing opening; 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. Tool holder rotation shaft; 28. Air outlet. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] The hot melt milling apparatus for subtractive processing of wind turbine blade surfaces provided by this invention, such as... Figures 1-3 As shown, the device includes a housing 2. Multiple forward milling cutters 8 and reverse milling cutters 9 are connected to the bottom of the housing 2. The forward milling cutters 8 and reverse milling cutters 9 are installed in a staggered manner. The top of the forward milling cutters 8 and reverse milling cutters 9 is connected to a milling cutter support plate 13. A functional plate 7 is provided on the upper surface of the milling cutter support plate 13. The forward milling cutters 8 and reverse milling cutters 9 are connected to drill motors 5 through the milling cutter support plate 13 and the functional plate 7. The tops of the multiple drill motors 5 are connected to motor fixing plates 3 by bolts 4. Drive units are installed on the symmetrical side walls of the housing 2. The motor fixing plate 3, the functional plate 7 and the milling cutter support plate 13 are all located inside the housing 2.

[0034] Example 2

[0035] The hot melt milling apparatus for subtractive processing of wind turbine blade surfaces provided in this embodiment, such as Figures 1-7As shown, including the shell 2, the shell 2 bottom connected with a plurality of positive milling cutter 8 and reverse milling cutter 9, positive milling cutter 8 and reverse milling cutter 9 in turn staggered installation, positive milling cutter 8 and reverse milling cutter 9 top joint milling cutter support plate 13, milling cutter support plate 13 upper surface is equipped with function board 7, positive milling cutter 8 and reverse milling cutter 9 through milling cutter support plate 13 and function board 7 are connected with drill bit motor 5, a plurality of drill bit motor 5 top through bolt 4 is connected with motor fixed plate 3, the shell 2 relative symmetry both sides wall is equipped with drive unit, motor fixed plate 3, function board 7 and milling cutter support plate 13 are all located in the shell 2 inside;Motor fixed plate 3 is also provided with motor groove 18, motor groove 18 is installed with fan motor 19, fan motor 19 output shaft is connected with fan blade 20;The shell 2 is close to the side wall of fan blade 20 and is provided with ventilation hole 6, and the milling cutter support plate 13 is provided with inclined outlet 28.

[0036] Example 3

[0037] The hot melting milling device for the wind turbine blade surface subtractive operation provided in the embodiment, as shown in Figures 1-7 As shown, including the shell 2, the shell 2 bottom connected with a plurality of positive milling cutter 8 and reverse milling cutter 9, positive milling cutter 8 and reverse milling cutter 9 in turn staggered installation, positive milling cutter 8 and reverse milling cutter 9 top joint milling cutter support plate 13, milling cutter support plate 13 upper surface is equipped with function board 7, positive milling cutter 8 and reverse milling cutter 9 through milling cutter support plate 13 and function board 7 are connected with drill bit motor 5, a plurality of drill bit motor 5 top through bolt 4 is connected with motor fixed plate 3, the shell 2 relative symmetry both sides wall is equipped with drive unit, motor fixed plate 3, function board 7 and milling cutter support plate 13 are all located in the shell 2 inside;Motor fixed plate 3 is also provided with motor groove 18, motor groove 18 is installed with fan motor 19, fan motor 19 output shaft is connected with fan blade 20;The shell 2 is close to the side wall of fan blade 20 and is provided with ventilation hole 6, and the milling cutter support plate 13 is provided with inclined outlet 28, the milling cutter support plate 13 bottom is provided with through hole, positive milling cutter 8 and reverse milling cutter 9 are all equipped with handle rotating shaft 27, the outer side of handle rotating shaft 27 is equipped with concentric circle ring, handle rotating shaft 27 and inner circle ring form hollow groove 26, the outer diameter of outer circle ring matches the outer diameter of the through hole at the bottom of milling cutter support plate 13, and the function board 7 is provided with a through hole matched with the outer diameter of the inner circle ring.

[0038] Example 4

[0039] The hot melting milling device for the wind turbine blade surface subtractive operation provided in the embodiment, as shown in Figures 1-7As shown, including the shell 2, the shell 2 bottom connected with a plurality of positive milling cutter 8 and reverse milling cutter 9, positive milling cutter 8 and reverse milling cutter 9 in turn staggered installation, positive milling cutter 8 and reverse milling cutter 9 top joint milling cutter support plate 13, milling cutter support plate 13 upper end surface is equipped with function plate 7, positive milling cutter 8 and reverse milling cutter 9 through milling cutter support plate 13 and function plate 7 connected with drill bit motor 5, a plurality of drill bit motor 5 top through bolt 4 connected with motor fixed plate 3, the shell 2 relative symmetry two side wall is installed with drive unit, motor fixed plate 3, function plate 7 and milling cutter support plate 13 are located in the shell 2 inside;Motor fixed plate 3 is also provided with motor groove 18, the motor groove 18 is installed with fan motor 19, the fan motor 19 output shaft is connected with fan blade 20;The shell 2 is close to the side wall of fan blade 20 and is provided with ventilation hole 6, the milling cutter support plate 13 is provided with inclined outlet 28, the milling cutter support plate 13 bottom is provided with through hole, positive milling cutter 8 and reverse milling cutter 9 are equipped with handle rotating shaft 27, the handle rotating shaft 27 outside is equipped with concentric circle ring, the handle rotating shaft 27 and inner ring form hollow groove 26, the outer diameter of outer ring and the outer diameter of the through hole at the bottom of the milling cutter support plate 13 match, the function plate 7 is provided with the through hole matched with the outer diameter of the inner ring;Function plate 7 is provided with fan hole 21 and coil hole 23, two hard wires 22 are arranged in the coil hole 23, the coil hole 23 is provided with a stand column wire 24 connected with the hard wire 22, the stand column wire 24 is located at the lower end surface of the function plate 7, the stand column wire 24 is wound with an electromagnetic coil 25 at the end, the electromagnetic coil 25 is suspended in the positive milling cutter 8 and the reverse milling cutter 9 through the handle rotating shaft 27;The shell 2 upper end surface is connected with handle 1.

[0040] Example 5

[0041] The hot melting milling device for wind turbine blade surface subtractive operation provided in the embodiment, like Figures 1-7As shown, including the shell 2, the shell 2 bottom connected with a plurality of positive milling cutter 8 and reverse milling cutter 9, positive milling cutter 8 and reverse milling cutter 9 in turn staggered installation, positive milling cutter 8 and reverse milling cutter 9 top joint milling cutter support plate 13, milling cutter support plate 13 upper end surface is equipped with function plate 7, positive milling cutter 8 and reverse milling cutter 9 through milling cutter support plate 13 and function plate 7 connected with drill bit motor 5, a plurality of drill bit motor 5 top through bolt 4 connected with motor fixed plate 3, the shell 2 relative symmetry two side wall is installed with drive unit, motor fixed plate 3, function plate 7 and milling cutter support plate 13 are located in the shell 2 inside;Motor fixed plate 3 is also provided with motor groove 18, motor groove 18 is installed with fan motor 19, fan motor 19 output shaft is connected with fan blade 20;The shell 2 is close to the side wall of fan blade 20 and is provided with ventilation hole 6, the milling cutter support plate 13 is provided with inclined outlet 28, the milling cutter support plate 13 bottom is provided with through hole, positive milling cutter 8 and reverse milling cutter 9 are equipped with handle rotating shaft 27, the outer side of handle rotating shaft 27 is equipped with concentric circle ring, handle rotating shaft 27 and inner ring form hollow groove 26, the outer diameter of outer ring matches with the outer diameter of the through hole at the bottom of milling cutter support plate 13, the function plate 7 is provided with a through hole matched with the outer diameter of inner ring;Function plate 7 is provided with fan hole 21 and coil hole 23, two hard wires 22 are arranged in coil hole 23, coil hole 23 is provided with a stand column wire 24 connected with hard wire 22, stand column wire 24 is located at the lower end surface of function plate 7, the end of stand column wire 24 is wound with electromagnetic coil 25, electromagnetic coil 25 passes through handle rotating shaft 27 and is suspended in the inside of positive milling cutter 8 and reverse milling cutter 9;The upper end surface of shell 2 is connected with handle 1;The drive unit comprises a plurality of supporting legs 17, the supporting leg 17 is provided with two cylindrical holes 1701, the cylindrical hole 1701 is provided with a supporting column 14, the end of supporting column 14 close to the shell 2 is welded with a round buckle 16, the other end of a plurality of supporting columns 14 is connected with a support 11, the support 11 is provided with a plurality of circular shafts 1101, each circular shaft 1101 is provided with a roller 12 through bearing hole 1201, a plurality of rollers 12 are provided with rubber track 10 on the outer wall;Supporting column 14 is provided with supporting spring 15.

[0042] Example 6

[0043] This embodiment provides a hot melt milling method for subtractive processing of wind turbine blade surfaces. Using the hot melt milling device provided in the above embodiment, the specific steps are as follows: First, the operator cleans and plans the path for the cracked areas on the wind turbine blade surface. Then, the hot melt milling device is switched on, allowing alternating current to flow through the coil, heating the milling cutter through the eddy current effect, starting the cutter's rotation, and turning on the fan motor. The device is then pressed onto the area to be milled. The track adheres to the blade surface, and the drill bit of the cutter drills first, with debris flowing out along the cutter's rotation path and being blown away by the fan. The device is then slowly pushed forward, with the track continuously adhering to the blade surface to provide stable milling conditions. At this point, the cutter transitions from drilling and cutting to milling with the side cutting edge. After traversing the predetermined path to the cracked surface to be eliminated, the blade is observed for any remaining cracks. If any are found, the above steps are repeated until no cracks are visible on the blade surface. Then, material filling, solidification, and grinding are performed, ultimately completing the repair of the wind turbine blade surface.

[0044] Example 7

[0045] This embodiment provides a hot melt milling apparatus and method for subtractive machining of wind turbine blade surfaces, such as... Figures 1-7 As shown, multiple milling cutters can be started simultaneously, and the cutters are staggered and installed in a repeating sequence of forward and reverse rotation. During operation, after the first cutter cuts, it is continuously cut by the second cutter, and so on, achieving the purpose of multiple milling cutters working simultaneously, thereby improving work efficiency. The reverse torque generated by the forward and reverse rotation of the cutters can cancel each other out, achieving stable operation of the mechanism. At the same time, the milling cutter head is similar to the drill bit head and can perform drilling. The middle end of the cutter shank is connected to the milling cutter support plate 13 through a groove, providing a fixed rotation point. The end of the cutter shank cooperates with the through hole on the functional plate 7, providing a second rotation point. Two rigid wires 22 are embedded in the coil hole 23 of the middle functional plate 7. The rigid wires 22 can both energize the electromagnetic coil 25 and fix the coil firmly through the column wire 24. The center of the milling cutter has a circular deep groove called a hollow groove 26. The function of the hollow groove 26 is to suspend the electromagnetic coil 25 inside the milling cutter. The center of the shank ring is the shank rotation shaft 27, which is connected to the end of the rotation shaft of the drill motor 5 to provide power for the rotation of the tool. When the tool is running, the electromagnetic coil is energized with alternating current, which can generate eddy currents inside the cutting edge and generate heat rapidly, thereby reaching the temperature required for cutting.

[0046] Further, the drill bit motor 5 is fixed to the motor fixing plate 3 by screw connection, the motor slot 18 is opened on the motor fixing plate 3, and the fan motor 19 is installed in the motor slot 18, the shaft end of the fan motor 19 is connected to the fan blade 20, the fan blade 20 is matched with the fan hole 21 on the function plate 7, and a closed air blowing channel can be formed, the air circulation enters from the air vent 6 of the shell, is blown out from the inclined air outlet 28 on the milling cutter support plate 13, and finally is blown to the cutting edge of the milling cutter and the material surface, so that the remaining debris on the cutting edge is blown away, the material surface is cooled, and the next cutter cutting is not stuck.

[0047] Further, the motor fixing plate 3, the function plate 7 and the milling cutter support plate 13 are fixed in the middle of the shell by welding, the upper end of the shell 2 has the handle 1 for the staff to hold and control the machine, the two sides near the fan in the middle are designed with the air vent 6, the lower end of the two horizontal sides is welded with the support leg 17, the cylindrical hole 1701 on the support leg 17 is used for installing the support column 14, the round buckle 16 is welded on the upper end of the support column 14, and the support column is clamped to prevent the support column from being separated from the support leg 17, the lower end is connected to the support 11, and the support column 14 is mainly used for bearing the force generated in the transverse direction of the device, and the support spring 15 is used as a vertical force bearing between the support 11 and the support leg 17.

[0048] Further, the round shaft 1101 of the support 11 penetrates the roller 12 through the bearing opening 1201 in the transverse direction, the rubber track 10 is arranged on the outer side of the roller 12, the rubber track 10 and the support leg 17 and other parts are matched to form a stabilizing element, and the rubber track 10 is arranged in four directions of the shell to improve the stability of the overall operation.

[0049] Further, the air vent 6 is located between the motor fixing plate 3 and the upper end surface of the shell inside, and between the motor fixing plate 3 and the function plate 7.

Claims

1. A hot melt milling device for subtractive processing of wind turbine blade surfaces, characterized in that, Includes an outer casing (2), the bottom of which is connected to multiple forward milling cutters (8) and reverse milling cutters (9). The forward milling cutters (8) and reverse milling cutters (9) are installed in a staggered manner. The top of the forward milling cutters (8) and reverse milling cutters (9) is connected to a milling cutter support plate (13). The upper surface of the milling cutter support plate (13) is provided with a functional plate (7). The forward milling cutters (8) and reverse milling cutters (9) are connected to drill motors (5) through the milling cutter support plate (13) and the functional plate (7). The tops of the multiple drill motors (5) are connected to motor fixing plates (3) by bolts (4). The two symmetrical side walls of the outer casing (2) are equipped with The drive unit, the motor fixing plate (3), the function plate (7) and the milling cutter support plate (13) are all located inside the outer shell (2); the function plate (7) is provided with a fan hole (21) and a coil hole (23), the coil hole (23) is provided with two hard wires (22), the coil hole (23) is provided with a column wire (24) connected to the hard wires (22), the column wire (24) is located on the lower end face of the function plate (7), the end of the column wire (24) is wound with an electromagnetic coil (25), the electromagnetic coil (25) passes through the tool holder rotation shaft (27) and is suspended inside the forward milling cutter (8) and the reverse milling cutter (9).

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

3. The hot melt milling apparatus for subtractive processing of wind turbine blade surface according to claim 2, characterized in that, The outer casing (2) has ventilation holes (6) on its side wall near the fan blade (20), and the milling cutter support plate (13) has an inclined air outlet (28).

4. The hot melt milling apparatus for subtractive processing of wind turbine blade surface according to claim 3, characterized in that, The end mill support plate (13) has a through hole at the bottom. Both the forward end mill (8) and the reverse end mill (9) are provided with a tool holder rotation shaft (27). A concentric ring is provided on the outside of the tool holder rotation shaft (27). The tool holder rotation shaft (27) and the inner ring form a hollow groove (26). The outer diameter of the outer ring matches the outer diameter of the through hole at the bottom of the end mill support plate (13).

5. The hot melt milling apparatus for subtractive processing of wind turbine blade surface according to claim 4, characterized in that, The drive unit includes multiple support legs (17), each support leg (17) has two cylindrical holes (1701), and a support column (14) is inserted through the cylindrical hole (1701). A round buckle (16) is welded to one end of the support column (14) near the outer shell (2). The other end of the multiple support columns (14) is connected to a bracket (11). The bracket (11) is provided with multiple round shafts (1101). Each round shaft (1101) has a roller (12) passing through a bearing port (1201). Rubber tracks (10) are installed on the outer wall of the multiple rollers (12).

6. The hot melt milling apparatus for subtractive machining of wind turbine blade surfaces according to claim 5, characterized in that, The functional plate (7) has through holes that match the outer diameter of the inner ring.

7. The hot melt milling apparatus for subtractive processing of wind turbine blade surface according to claim 6, characterized in that, The support column (14) is fitted with a support spring (15).

8. The hot melt milling apparatus for subtractive processing of wind turbine blade surface according to claim 7, characterized in that, The upper surface of the outer shell (2) is connected to a handle (1).

9. A hot melt milling method for subtractive machining of wind turbine blade surfaces, characterized in that, Using the hot melt milling device for subtractive processing of wind turbine blade surface as described in claim 5, the specific steps are as follows: First, clean and plan the path for the cracks on the surface of the wind turbine blade. Then, turn on the hot melt milling device switch and let the alternating current flow through the electromagnetic coil (25). 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 tool holder rotating shaft (27). The fan motor (19) is turned on and the rubber track (10) is attached to the blade surface. The drill bit of the milling cutter first drills, and the debris flows out along the rotation track of the cutting edge and is blown away by the fan blade (20). Then, the rubber track (10) is slowly pushed forward. At this time, the milling cutter changes from drilling and cutting to milling and cutting by the side cutting edge. After the cracked surface needs to be eliminated according to the predetermined track, until there are no cracks on the blade surface, the repair of the wind turbine blade surface is completed.

Images