A coating spraying device for wind turbine blades

Abstract

This invention discloses a coating spraying device for wind turbine blades, comprising a spray nozzle, a coating storage tank, a coating delivery main pipe, and several spraying mechanisms. The spray nozzles are radially distributed on the blade. The coating storage tank is disposed within the blade hub and is used to store the hydrophobic coating to be sprayed. The coating delivery main pipe is longitudinally inserted into the blade cavity and is used to transport the hydrophobic coating from the coating storage tank along the radial direction of the blade. The several spraying mechanisms are radially spaced and installed within the blade cavity, connected to the corresponding coating delivery main pipes via coating docking mechanisms. Each spraying mechanism is a telescopic spraying mechanism that extends through the spray nozzles on the blade to apply the waterproof coating to the outer surface of the blade. This invention enables the online spraying of waterproof coating onto the blade surface, forming a superhydrophobic coating that prevents water droplet accumulation on the blade surface and effectively prevents water droplets from freezing on the blade surface.

Description

Technical Field

[0001] This invention belongs to the technical field of wind power generation equipment, and relates to an auxiliary device for wind power generation equipment, specifically a coating spraying device for wind turbine blades. Background Technology

[0002] Currently, wind energy, as a clean energy source, is widely used in countries around the world. However, wind turbines in colder winter regions often face the problem of blade icing, preventing them from generating electricity and causing significant losses. Icing also severely impacts the safety, lifespan, and maintenance costs of wind turbines, while falling ice poses safety hazards to people, livestock, and equipment in the surrounding area.

[0003] Current methods for solving the problem of blade icing can be divided into active and passive approaches. Active approaches generally prevent ice buildup on wind turbines through certain methods, such as thermal anti-icing, anti-icing coatings, and air-based antifreeze technology. Thermal anti-icing uses heating devices to provide heat energy to heat the inner wall or surface of the object, raising the surface temperature and melting the ice layer, thereby achieving the effect of preventing and removing ice. Thermal anti-icing is highly efficient, but electric heating wires make the blades susceptible to lightning strikes during thunderstorms.

[0004] Anti-icing coatings are applied to the blade surface to form a superhydrophobic coating, which prevents icing by avoiding water accumulation on the blade surface. The main problem with existing anti-icing coatings is that they are difficult to apply, and the coatings are not effective for long and are easy to peel off, leading to anti-icing failure. Summary of the Invention

[0005] The purpose of this invention is to at least solve the technical problems existing in the prior art and provide a coating spraying device for wind turbine blades, which can automatically spray anti-icing coating on the surface of wind turbine blades to form a superhydrophobic coating on the blade surface, prevent water droplet accumulation, and improve anti-icing efficiency.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A coating spraying device for wind turbine blades, comprising:

[0008] Spray nozzles, several spray nozzles are radially distributed on the blade;

[0009] A paint storage tank, located inside the hub of the blades, is used to store hydrophobic paint to be sprayed.

[0010] A paint delivery main pipe, longitudinally integrated within the cavity of the blades, is used to transport hydrophobic paint from the paint storage tank along the radial direction of the blades; and

[0011] Several spraying mechanisms are radially spaced and installed inside the cavity of the blade. They are connected to the paint delivery main pipe at the corresponding position through the paint docking mechanism. The spraying mechanism is a telescopic spraying mechanism that extends through the spray nozzle on the blade to apply waterproof paint to the outer surface of the blade.

[0012] As a preferred technical solution, the spraying mechanism includes

[0013] The first telescopic mechanism is installed inside the blade cavity via a rotating assembly;

[0014] The spray protection tube is installed at the telescopic end of the telescopic component via a bending assembly;

[0015] The spray pipe is installed inside the spray protection pipe via a second telescopic mechanism, and has several spray holes distributed along its length.

[0016] A temporary storage tank, installed inside a spray protection pipe, includes at least an inlet and an outlet. The inlet is connected to the main paint delivery pipe at the corresponding location via a paint docking mechanism, and the outlet is connected to the spray pipe via a pressurizing mechanism.

[0017] As a preferred technical solution, the first telescopic mechanism includes a support tube and a hydraulic telescopic rod installed inside the support tube. The support tube is fixed on the inner wall of the cavity of the blade. The tail end of the hydraulic telescopic rod is installed inside the support tube through a bearing. The free telescopic end of the hydraulic telescopic rod is connected to the spray protection tube. The hydraulic telescopic rod is driven to rotate around its own axis through a rotating component to achieve rotary spraying.

[0018] As a preferred technical solution, the rotating assembly includes a driven gear coaxially fixed to the tail end of the hydraulic telescopic rod, a drive gear meshing with the driven gear, and a power mechanism connected to the drive gear.

[0019] As a preferred technical solution, the bending component is a power joint used to drive the spray protection tube to bend in the same direction as the support tube or to the side, forming a rotary spray covering a certain area.

[0020] As a preferred technical solution, the tail end of the spraying pipe is connected to the pressurization mechanism via a flexible hose or a retractable corrugated pipe.

[0021] As a preferred technical solution, the second telescopic mechanism includes a rack disposed on the outer wall of the spray pipe, a gear meshing with the rack, and a motor driving the gear.

[0022] As a preferred technical solution, the coating docking mechanism includes a docking head and a translation mechanism. The docking head is connected to the coating replenishment pipeline via a hose. The translation mechanism is used to drive the docking head to translate and dock with the spraying structure housed in the blade cavity. The docking head is also equipped with a shut-off valve.

[0023] As a preferred technical solution, the paint spraying device also includes a camera and a laser rangefinder for monitoring the real-time conditions on the blade. The camera and laser rangefinder are both installed inside the hub of the blade and take pictures and measure distances through the shooting holes and ranging holes opened on the hub housing.

[0024] As a preferred technical solution, the paint spraying device further includes a data acquisition device, a wireless communication device, a wireless transmission device, a data processing workstation, and several terminals; the data acquisition device is used to collect image data captured by the camera and distance data measured by the laser rangefinder, and to judge the condition of the blade surface through manual or neural network learning to determine whether to start the paint spraying device for rotary spraying.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] This invention uses a coating spraying device to spray waterproof coating onto the surface of blades online, forming a superhydrophobic coating that can prevent water droplets from accumulating on the blade surface and effectively prevent water droplets from freezing on the blade surface. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a wind turbine in the existing technology.

[0028] Figure 2 This is a schematic diagram of the paint spraying device installed on the blade for online spraying in an embodiment of the present invention.

[0029] Figure 3 yes Figure 2 Partial schematic diagram on the right side of the middle section.

[0030] Figure 4 This is a schematic diagram of the spraying mechanism installed inside the blade cavity.

[0031] Figure 5 This is a schematic diagram of the coating docking mechanism inside the blade.

[0032] Figure 6 This is a schematic diagram of the first telescopic mechanism being installed inside the blade cavity via a rotating assembly.

[0033] Figure 7 This is a schematic diagram showing the spraying pipe installed inside the spraying protection pipe via a second telescopic mechanism.

[0034] Figure 8 This is a schematic diagram showing the coating mechanism extending from the cavity of the blade to perform the coating process.

[0035] 100-blade, 101-spray nozzle, 102-cavity, 200-hub, 300-tower, 400-nacelle, 410-chassis, 420-nacelle cover, 430-control unit, 500-foundation;

[0036] 600-Paint spraying device, 610-Paint storage tank, 620-Paint conveying main pipe, 630-Spraying mechanism, 631-First telescopic mechanism, 6311-Support pipe, 6312-Hydraulic telescopic rod, 6313-Bearing;

[0037] 632-Rotating component, 6321-Driven gear, 6322-Drive gear, 6323-Power mechanism;

[0038] 633-Spraying protection tube, 6331-Spray nozzle, 634-Bending component;

[0039] 635-Spray tube, 6351-Spray hole, 6352-Solenoid valve;

[0040] 636-Second telescopic mechanism, 6361-Rack, 6362-Gear, 6363-Motor;

[0041] 637-Temporary storage tank; 6371-Paint injection port; 638-Pressure boosting mechanism;

[0042] 640 - Coating docking mechanism, 6401 - Butt joint, 6402 - Translation mechanism;

[0043] 7-Camera, 8-Laser rangefinder, 9-Data acquisition device, 10-Wireless communication device, 11-Wireless transmission device, 12-Data processing workstation, 13-Terminal, 14-Pan-Tilt-Zone. Detailed Implementation

[0044] The technical solution of a coating spraying device for wind turbine blades provided by the present invention will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of the present invention will become clearer with the following description. It should be noted that the embodiments of the present invention have good implementability and are not intended to limit the present invention in any way. The accompanying drawings of the present invention are all in a very simplified form and use non-precise proportions, only for the purpose of conveniently and clearly illustrating the embodiments of the present invention, and are not intended to limit the conditions under which the present invention can be implemented.

[0045] like Figure 1 As shown, in the prior art, a wind turbine generator mainly includes, from bottom to top, a foundation 500, a tower 300, a nacelle 400, blades 100, a hub 200, and a control unit 430. The nacelle 400 is installed on top of the tower 300 and includes a chassis 410 and a nacelle cover 420. The nacelle 400 typically houses a control unit 430 consisting of a yaw system, a transmission system, a braking system, a generator, and a control system. The blades 100 are generally mounted on the nacelle cover 420 via the hub 200.

[0046] Reference Figure 2 The present invention provides a coating spraying device 600 for wind turbine blades, comprising:

[0047] Spray nozzle 101, a plurality of spray nozzles 101 are radially distributed on blade 100;

[0048] A paint storage tank 610 is disposed inside the hub 200 of the blade 100 and is used to store hydrophobic paint to be sprayed.

[0049] A paint delivery main pipe 620, longitudinally penetrating within the cavity 102 of the blade 100, is used to convey the hydrophobic paint from the paint storage tank 610 along the radial direction of the blade 100; and

[0050] Several spraying mechanisms 630 are radially spaced and installed in the cavity 102 of the blade 100. Each spraying mechanism 630 is connected to the corresponding paint delivery main pipe 620 through the paint docking mechanism 640. The spraying mechanism 630 is a telescopic spraying mechanism that extends through the spray nozzle 101 on the blade 100 to apply waterproof paint to the outer surface of the blade 100. Generally, the waterproof paint is a superhydrophobic paint.

[0051] In a specific embodiment, since the hub 200 rotates with the blade 100, the paint storage tank 610 can generally be fixed inside the nacelle cover 420 by a bracket; under normal circumstances, the spraying mechanism 630 retracts into the cavity 102 of the blade, such as Figure 4 As shown; when superhydrophobic coating needs to be sprayed on the blade 100, the corresponding coating docking mechanism 640 is activated, injecting the coating from the coating delivery main pipe 620 into the corresponding spraying mechanism 630. Then, the spraying mechanism 630 is activated, extending from the spray nozzle 101 on the blade 100, as shown. Figure 8 As shown, a waterproof coating is applied to the outer surface of the blade 100, thereby forming a superhydrophobic coating on the surface of the blade 100, preventing water droplets from accumulating on the surface of the blade 100, thus preventing the blade 100 from freezing, especially in environments with large daytime and nighttime temperature differences.

[0052] As one specific embodiment, the spraying mechanism 630 includes

[0053] The first telescopic mechanism 631 is installed in the cavity 102 of the blade 100 via the rotating component 632;

[0054] The spray protection tube 633 is installed on the telescopic end of the telescopic component via the bending component 634;

[0055] The spray pipe 635 is installed inside the spray protection pipe 633 via the second telescopic mechanism 636, and has a number of spray holes 6351 distributed along the length direction.

[0056] Temporary storage tank 637 is installed inside the spray protection pipe 633. It includes at least an inlet and an outlet. The inlet is connected to the paint delivery main pipe 620 at the corresponding position through the paint docking mechanism 640, and the outlet is connected to the spray pipe 635 through the pressurization mechanism 638.

[0057] When a certain spraying mechanism 630 needs to be activated, paint is received through the temporary storage tank 637 of the corresponding spraying mechanism 630, and the paint in the paint delivery main pipe 620 is injected into the temporary storage tank 637 of the corresponding spraying mechanism 630 through the paint docking mechanism 640. During spraying, the first telescopic mechanism 631 is activated to send the spray protection pipe 633 out from the spray nozzle 101 on the blade 100. When the spray protection pipe 633 reaches the outside of the blade 100, the bending component 634 is activated to adjust the spray protection pipe 633 to an angle with the first telescopic mechanism 631. Figure 8 As shown, the second telescopic mechanism 636 is then activated to extend the spray pipe 635 from the spray protection pipe 633. Next, the pressurization mechanism 638 is activated to spray the paint from the temporary storage tank 637 out of the spray pipe 635. Simultaneously, the rotating component 632 is activated, causing the spray protection pipe 633 to rotate around the axis of the first telescopic mechanism 631, thereby driving the spray pipe 635 to perform rotational spraying. The sprayed surface covers a circular area centered on the spray nozzle 101. The extension length of the spray pipe 635 is adjusted using the second telescopic mechanism 636 to adjust the coverage area. After spraying is complete, the pressurization mechanism 638 is stopped, and the spray pipe 635 is retracted into the spray protection pipe 633 using the second telescopic mechanism 636. The bending component 634 adjusts the spray protection pipe 633 to a parallel state with the first telescopic mechanism 631. The first telescopic mechanism 631 is then activated, causing the spray protection pipe 633 to retract into the cavity 102 of the blade 100, completing the sequential paint spraying process.

[0058] like Figure 4 As shown, in order to avoid the impact of opening the spray nozzle 101 on the blade 100 on the blade aerodynamics, when both the first telescopic mechanism 631 and the second telescopic mechanism 636 are in the retracted state, the outer end of the spray pipe 635 is flush with the outer end of the spray protection pipe 633, and is also flush with the blade surface at the spray nozzle 101. Since the outer end of the spray pipe 635 is a closed end, it can just block the spray nozzle 101, which will not affect the aerodynamics of the blade 100, nor will it cause dust and other impurities to enter the cavity 102 of the blade 100.

[0059] For example, such as Figures 4 to 6As shown, the first telescopic mechanism 631 includes a support tube 6311 and a hydraulic telescopic rod 6312 installed in the support tube 6311. The support tube 6311 is fixed on the inner wall of the cavity 102 of the blade 100. The tail end of the hydraulic telescopic rod 6312 is installed in the support tube 6311 through a bearing 6313. The free telescopic end of the hydraulic telescopic rod 6312 is connected to the spray protection tube 633 through a bending assembly 634. The hydraulic telescopic rod 6312 is driven to rotate around its own axis by a rotating assembly 632 to achieve rotary spraying.

[0060] For example, such as Figure 6 As shown, the rotating assembly 632 includes a driven gear 6321 coaxially fixed to the tail end of the hydraulic telescopic rod 6312, a drive gear 6322 meshing with the driven gear 6321, and a power mechanism 6323 connected to the drive gear 6322. The power mechanism 6323 is generally an electric motor.

[0061] For example, the bending component 634 is a power joint, such as a servo motor or other power mechanism 6323, used to drive the spray protection tube 633 to bend coaxially with the support tube 6311 or laterally. Figure 8 As shown, a rotary spray coating is formed, covering a certain area.

[0062] To further explain the spraying mechanism 630 of the present invention, as follows: Figure 7 As shown, the tail end of the spraying pipe 635 is connected to the pressurization mechanism 638 via a flexible hose or a telescopic corrugated pipe. The front end of the spraying pipe 635 is closed, and the pipe body is provided with spraying holes 6351 distributed along its length. Paint is sprayed out from the spraying holes 6351 for spraying. When the spraying protection pipe 633 and its inner spraying pipe 635 are perpendicular to or at an angle to the first telescopic mechanism 631, the inner spraying pipe 635 of the spraying protection pipe 633 is extended through the second telescopic mechanism 636, which can adjust the spraying area or spraying zone to achieve precise spraying.

[0063] As an improved embodiment, such as Figure 7 As shown, each spray hole 6351 of the spray pipe 635 can also be equipped with a solenoid valve 6352 to control the size of the spray area.

[0064] like Figure 7 As shown, in order to further expand the spraying range and prevent blind spots around the nozzle, the spraying protection tube 633 can also be provided with a spray hole 6331 corresponding to the position of the spraying hole 6351. When the positions are exactly corresponding, the paint sprayed from the spray hole 6351 on the spraying tube 635 can be sprayed out from the spray hole 6331.

[0065] As a common knowledge, such as Figure 7As shown, the inlet of the temporary storage tank 637 is a paint injection port 6371. The paint injection port 6371 is provided with a rubber plug or similar docking structure that can puncture and inject paint, so that the paint docking mechanism 640 can inject paint into the temporary storage tank 637.

[0066] As is common knowledge, a transfer pump (not shown in the attached diagram) is also provided between the paint storage tank 610 and the paint transfer main pipe 620. When the superhydrophobic coating is a two-component coating, there are two paint storage tanks 610 and two paint transfer main pipes 620. After the two components are mixed, they are injected into the corresponding spraying mechanism 630 for spraying through the paint docking mechanism 640.

[0067] As an improved embodiment, such as Figure 7 As shown, the second telescopic mechanism 636 includes a rack 6361 disposed on the outer wall of the spray pipe 635, a gear 6362 meshing with the rack 6361, and a motor 6363 driving the gear 6362. The spray pipe 635 is driven to move axially relative to the spray protection pipe 633 through the gear 6362 and rack 6361 mechanism, thereby realizing the adjustment of the spraying range.

[0068] As is common knowledge, the pressurization mechanism 638 is generally a booster pump. The inlet of the booster pump is connected to the temporary storage tank 637, and the outlet is connected to the spray pipe 635 through a hose or telescopic pipe.

[0069] As an improved embodiment, such as Figure 4 and Figure 5 As shown, the paint docking mechanism 640 includes a docking connector 6401 and a translation mechanism 6402. The docking connector 6401 is connected to the paint replenishment pipeline via a hose. The translation mechanism 6402 is used to drive the docking connector 6401 to translate and dock with the spraying structure housed in the cavity 102 of the blade 100. The docking connector 6401 is also equipped with a shut-off valve. The specific structure and shape of the docking connector 6401 in this invention are designed according to the structure and shape of the paint injection port 6371 on the temporary storage tank 637. For example, when the paint injection port 6371 is equipped with a rubber stopper, the docking connector 6401 can be set as a puncture needle type. After puncturing the rubber stopper, the paint is injected by driving the translation mechanism 6402, similar to a medical syringe.

[0070] It should be noted that the type of translation mechanism 6402 is not limited; anything capable of translational movement is acceptable, such as cylinders, electric push rods, etc.

[0071] It should be noted that in order to automate the start and stop of the above-mentioned structures, a controller and sensors are generally required. This is common knowledge and is not a necessary technical feature for solving the technical problem of this invention. Therefore, this invention will not elaborate on it in detail.

[0072] The paint spraying device 600 of the present invention can spray the fan blades 100 before installation or during operation. During online spraying, for example... Figure 2 and Figure 3 As shown, a camera 7 and a laser rangefinder 8 should generally be installed to monitor the real-time condition of the blade 100. Both the camera 7 and the laser rangefinder 8 are installed inside the hub 200 of the blade 100, and capture and measure distances through shooting holes and ranging holes opened on the hub 200 housing. The camera 7 can be a high-definition camera 7 to capture high-definition photos of the blade 100. Ideally, the high-definition camera 7 is mounted on the gimbal 14, thus covering the entire blade 100. Generally, the spraying of this invention targets the windward side of the blade 100, so the high-definition camera 7 is correspondingly positioned to capture the windward side of the blade 100. Alternatively, multiple high-definition cameras 7 mounted on the gimbal 14 can be installed to take photos of the blade 100 from all angles. The photos are used to determine whether the waterproof coating is intact, and whether to restart the paint spraying device 600 for online spraying. Generally, online spraying should be carried out during the day when temperatures are high to avoid the waterproof coating failing to form due to dew or other impurities on the blade 100 itself.

[0073] As a preferred embodiment, such as Figure 3 As shown, the laser ranging device 8 can be installed on the gimbal 14. The location of coating damage is determined by measuring distance with the laser ranging device 8. The images captured by the high-definition camera 7 are often similar and it is difficult to determine the specific location. After synchronous distance measurement by the laser ranging device 8, the location of coating damage can be quickly determined to be radially operated on the blade 100, thereby enabling the corresponding spraying mechanism 630 to be quickly started for spraying.

[0074] Since the blade 100 is rotating during online spraying, the gimbal 14 of the HD camera 7 can be fixed to the hub 200 of the blade 100 and rotate with it.

[0075] Because wind turbines are generally located in the field with poor communication conditions, in order to improve the level of automation, such as Figure 2As shown, the paint spraying device 600 also includes a data acquisition device 9, a wireless communication device 10, a wireless transmission device 11, a data processing workstation 12, and several terminals 13. The data acquisition device 9 is used to acquire image data captured by the camera 7 and distance data measured by the laser rangefinder 8. The acquired data is transmitted through the wireless communication device 10 and sent to the remote data processing workstation 12 through the wireless transmission device 11. The data acquisition device 9 generally includes a data acquisition card and a matching controller (such as an industrial control computer) for data conversion. The wireless communication device 10 can be a WIFI module, and the wireless transmission device 11 can be a WIFI receiver and a base station for remote data transmission. After the image data and distance data are transmitted to the data processing workstation 12, they can be displayed on the screen of the data processing workstation 12. The surface condition of the blade 100 is judged manually or by neural network learning to determine whether to start the paint spraying device 600 for rotational spraying. The terminals 13 can be mobile phones, tablets, and personal computers, which are connected to the data processing workstation 12 via a network to view data and perform control, such as controlling a specific spraying mechanism 630 for precise point spraying.

[0076] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the invention in any way. Any changes or modifications made by those skilled in the art based on the above-disclosed technical content should be considered as equivalent and valid embodiments, and all fall within the scope of protection of the present invention.

Claims

1. A coating spraying device for wind turbine blades, characterized in that, include Spray nozzles, several spray nozzles are radially distributed on the blade; A paint storage tank, located inside the hub of the blades, is used to store hydrophobic paint to be sprayed. A paint delivery main pipe, longitudinally integrated within the cavity of the blades, is used to transport hydrophobic paint from the paint storage tank along the radial direction of the blades; and Several spraying mechanisms are radially spaced and installed in the cavity of the blade. They are connected to the paint delivery main pipe at the corresponding position through the paint docking mechanism. The spraying mechanism is a telescopic spraying mechanism that extends through the spray nozzle on the blade to apply waterproof paint to the outer surface of the blade to form a superhydrophobic coating. The spraying mechanism includes The first telescopic mechanism is installed inside the blade cavity via a rotating assembly; The spray protection tube is installed at the telescopic end of the telescopic component via a bending assembly; The spray pipe is installed inside the spray protection pipe via a second telescopic mechanism, and has several spray holes distributed along its length. A temporary storage tank, installed inside a spray protection pipe, includes at least an inlet and an outlet. The inlet is connected to the main paint delivery pipe at the corresponding location via a paint docking mechanism, and the outlet is connected to the spray pipe via a pressurizing mechanism. The first telescopic mechanism includes a support tube and a hydraulic telescopic rod installed inside the support tube. The support tube is fixed to the inner wall of the cavity of the blade. The hydraulic telescopic rod is installed inside the support tube through a bearing. The free telescopic end of the hydraulic telescopic rod is connected to the spray protection tube. The hydraulic telescopic rod is driven to rotate around its own axis through a rotating component to achieve rotary spraying.

2. The paint spraying device according to claim 1, characterized in that, The rotating assembly includes a driven gear coaxially fixed to the tail end of the hydraulic telescopic rod, a drive gear meshing with the driven gear, and a power mechanism connected to the drive gear.

3. The paint spraying device according to claim 1, characterized in that, The bending component is a power joint used to drive the spray protection tube to bend in the same direction as the support tube or to the side, forming a rotary spray covering a certain area.

4. The paint spraying device according to claim 3, characterized in that, The end of the spray nozzle is connected to the pressurization mechanism via a flexible hose or a retractable corrugated pipe.

5. The paint spraying device according to claim 4, characterized in that, The second telescopic mechanism includes a rack disposed on the outer wall of the spray pipe, a gear meshing with the rack, and a motor driving the gear.

6. The paint spraying apparatus according to any one of claims 1-5, characterized in that, The coating docking mechanism includes a docking head and a translation mechanism. The docking head is connected to the coating replenishment pipeline via a hose. The translation mechanism is used to drive the docking head to translate and dock with the spraying structure housed in the blade cavity. The docking head is also equipped with a shut-off valve.

7. The paint spraying device according to claim 6, characterized in that, It also includes a camera and a laser rangefinder for monitoring the real-time conditions on the blade. The camera and laser rangefinder are both installed inside the hub of the blade and take pictures and measure distances through the shooting holes and ranging holes opened on the hub housing.

8. The paint spraying apparatus according to claim 7, characterized in that, It also includes a data acquisition device, a wireless communication device, a wireless transmission device, a data processing workstation, and several terminals; the data acquisition device is used to collect image data captured by the camera and distance data measured by the laser rangefinder, and to judge the condition of the blade surface through manual or neural network learning to determine whether to start the paint spraying device for rotary spraying.

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