Blade protective paint blade coating tool and blade coating method

Abstract

The invention provides a blade protective paint blade coating tool and method, the blade protective paint blade coating tool comprises a first thickness control strip and two edge thickness control strips, the first thickness control strip is used for being arranged in a paint coating area of a blade, and the two edge thickness control strips are used for being arranged on the edges of the two sides of the paint coating area of the blade; the painting tool comprises a handle, a supporting frame connected with the handle, a rolling assembly connected to the handle or the supporting frame and an elastic scraping plate connected to the supporting frame. The two ends, in the length direction, of the elastic scraping plate are installed on the two opposite sides of the supporting frame correspondingly, and the lower end face of the elastic scraping plate is self-adaptively deformed into a smooth transition arc face when abutting against the painting area. A roller of the rolling assembly is used for rolling in the painting area in the extending direction of the first thickness control strip. According to the blade protective paint blade coating tool and the blade coating method, the coating thickness of the protective paint is guaranteed, the effect that the molded surface of the blade is flat and smooth after the blade is painted is achieved, and the blade painting quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbine blades, and in particular to a blade protective paint scraping tool and a scraping method. Background Art

[0002] As wind turbine blades grow longer, the linear velocity in the blade tip increases, and the number of blades deployed in harsh wind farms increases, placing a greater strain on the blade's leading edge protection. Currently, the main approaches used to enhance blade leading edge protection are applying protective paint, film, or adhesively bonding protective covers to the blade tip.

[0003] There are two main methods for applying protective paint on the leading edge of the blade: roller coating and scraper coating. When the viscosity of the protective paint is relatively low, roller coating is used. The roller coating method requires many roller coating passes, the paint film thickness is not easy to meet the standard, and the painted surface is rough. When the viscosity of the protective paint is relatively high, scraper coating is laborious to operate, and requires high operator skills. The paint thickness of the protective paint is not easy to guarantee, and the surface of the blade after painting is prone to unevenness and roughness.

[0004] The method of applying film or gluing protective shells requires high operator skills, and defects such as cavities and bubbles are easily generated in the pasting area, and the transition with the blade surface is poor. The method of applying film is prone to wrinkles and has poor protection effect. The method of applying protective shells is heavy and affects the aerodynamic shape of the blade. Summary of the Invention

[0005] The present application provides a blade protective paint scraping tool and scraping method to solve the problems existing in the prior art, ensure the paint thickness of the protective paint, and achieve the effect of a flat and smooth surface after the blade is painted, thereby improving the quality of the blade painting.

[0006] The blade protective paint scraping tool provided in the present application includes: a first thickness control strip and two edge thickness control strips, the first thickness control strip is used to be set in the painting area of the blade and extends along the center line direction of the leading edge of the blade, and the two edge thickness control strips are used to be set at the two side edges of the painting area of the blade; a painting tool, the painting tool includes a handle, a support frame connected to the handle, a rolling assembly connected to the handle or the support frame, and an elastic scraper connected to the support frame; the two ends of the elastic scraper along the length direction are respectively installed on the two opposite sides of the support frame, the lower end face of the elastic scraper is a plane, and when it abuts against the painting area, it adaptively deforms into a smoothly transitioned arc surface, and the two side edges of the painting area along the width direction are located within the two ends of the elastic scraper along the length direction; the rolling assembly includes a roller, and the roller is used to roll in the painting area along the extension direction of the first thickness control strip.

[0007] Optionally, the support frame includes a top arm and two side arms respectively connected to both sides of the top arm in a hinged manner, the two side arms are bent, and the two ends of the elastic scraper are respectively provided on the two side arms.

[0008] Optionally, a first mounting portion and a second mounting portion are provided on the side arm, the first mounting portion is used to be connected to the end of the elastic scraper, and the second mounting portion is provided with an arm wheel, and the side surfaces of the two arm wheels are used to rotate and fit on both sides of the center line of the leading edge of the blade and be located outside the painting area when the elastic scraper is scraping the protective paint.

[0009] Optionally, the painting tool further includes a positioning member, which includes a vertically connected mounting rod and a positioning shaft, the mounting rod is installed on the second mounting portion, and the arm wheel is rotatably arranged on the positioning shaft.

[0010] Optionally, the rolling assembly further includes a support leg connected to the handle or the support frame, a support shaft mounted on the support leg, and two rollers located on the support shaft, wherein the support leg is located between the two rollers.

[0011] Optionally, the blade protective paint scraping tool further includes two second thickness control strips respectively located on both sides of the first thickness control strip, and the two rollers are respectively rollingly set on the two second thickness control strips.

[0012] Optionally, the painting tool further includes a tracing pointer, which is mounted on the support shaft or the support leg, and is parallel to the first thickness control strip or is located directly above the first thickness control strip and extends in the same direction as the first thickness control strip.

[0013] Optionally, a heating unit and a temperature sensor are provided in the elastic scraper, and the painting tool is provided with a temperature display connected to the temperature sensor for communication and a control switch for controlling the opening and closing of the heating unit.

[0014] Optionally, a flange extending toward the roller is provided on the top of the elastic scraper.

[0015] The present application also provides a method for scraping protective paint on wind turbine blades, which scrapes protective paint on the painted area using any of the blade protective paint scraping tools described above, including the following steps: S1: edge thickness control strips are set on both sides of the outer edges of the painted area of the blade to control and protect the thickness of the outer edges of the painted area on both sides; S2: a first thickness control strip is set in the painted area of the blade, and the first thickness control strip extends along the center line direction of the leading edge of the blade; S3: protective paint is applied to the painted area of the blade, and the protective paint is scraped using a painting tool, the middle part of the lower end face of the elastic scraper abuts on the first thickness control strip, and the two sides of the lower end face of the elastic scraper respectively abut on the two edge thickness control strips, and the roller rolls forward on the blade under the action of the handle; S4: the edge thickness control strip of the protective paint is removed after the scraping is completed.

[0016] The above technical solution has the following beneficial effects:

[0017] The blade protective paint scraping tool and scraping method provided in the present application have an elastic scraper that can produce a certain deformation after being subjected to force so as to be adaptive, and cooperate with the support frame to deform under the force of the handle to adapt to the shape of the leading edge of the blade, and the middle part of the lower end surface abuts against the top of the first thickness control strip, and the two sides of the lower end surface respectively abut against the top of the edge thickness control strip, so that the leading edge of the blade is coated with the thickness of the first thickness control strip as the center line of the leading edge, and the thickness of the edge thickness control strip is the coating thickness of the two sides of the coating area. Through its own deformation, the height difference of the coating thickness between the first thickness control strip and the edge thickness control strips on both sides is uniformly transitioned to ensure the required protective paint coating thickness, and the lower end surface of the elastic scraper forms a smoothly transitioned arc surface between the first thickness control strip and the edge thickness control strips on both sides under its own adaptive action. The protective paint is scraped through this arc surface, so that the surface of the blade after painting is flat and smooth, thereby improving the reliability of the blade product and reducing quality risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of the present application, wherein:

[0019] Figure 1 A color stereoscopic image of a blade protective paint coating tool provided in one embodiment of the present application coating protective glue on a blade.

[0020] Figure 2 This is a color stereoscopic image of the blade protective paint scraping tool provided in one embodiment of the present application when scraping protective paint on a blade.

[0021] Figure 3 A three-dimensional line drawing of a blade protective paint scraping tool provided in one embodiment of the present application scraping protective paint on a blade.

[0022] Figure 4 This is a first view of the blade protective paint scraping tool provided in one embodiment of the present application.

[0023] Figure 5 This is a second view of the blade protective paint scraping tool provided in one embodiment of the present application.

[0024] Figure 6 A third view of the blade protective paint scraping tool provided in one embodiment of the present application.

[0025] Figure 7 This is a flow chart of a blade protective paint scraping method provided in one embodiment of the present application.

[0026] Description of reference numerals:

[0027] 1- blade, 10- painting area, 11- edge thickness control strip;

[0028] 2- first thickness control strip;

[0029] 3- painting tool, 30- handle, 31- support frame, 310- top arm, 311- side arm, 32- rolling assembly, 320- support leg, 321- support shaft, 322- roller, 33- elastic scraper, 34- arm wheel, 35- positioning piece, 350- mounting rod, 36- tracer pointer;

[0030] 4- Second thickness control strip. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below through examples and in conjunction with the accompanying drawings. Directional terms such as "up," "down," "left," "right," "front," "back," "front," "back," "top," and "bottom" mentioned or potentially mentioned in this specification are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these and other directional terms should not be construed as restrictive.

[0032] The blade protective paint scraping tool provided in this application includes: a first thickness control strip 2 and a painting tool 3.

[0033] Among them, such as Figures 1 to 3As shown, the first thickness control strip 2 is used to be set in the painting area 10 of the blade 1 and extends along the center line direction of the leading edge of the blade 1. The center line of the leading edge of the blade 1 is located in the middle of the leading edge of the blade 1 along the length direction of the blade 1, and the painting area of the leading edge of the blade 1 is symmetrical with the center line of the leading edge. The thickness of the first thickness control strip 2 is prepared according to the required paint thickness. For example, if the thickness h1 of the paint required at the center line of the leading edge of the blade 1 is 5 mm, the thickness of the first thickness control strip 2 is set to 5 mm. The material of the first thickness control strip 2 can be the same as the material of the prefabricated protective paint, such as fluoropolymer material; or a material with better weather resistance than the protective paint, such as aliphatic polyurethane material. The first thickness control strip 2 is set on the blade 1 by bonding.

[0034] Among them, the two side edges of the painting area 10 of the leading edge of the blade 1 are flexibly set according to the required paint thickness. For example, if the paint thickness h2 of the two side edges of the painting area 10 is required to be 5 mm, 5 mm thick masking tape is set along the two side edges; if the paint thickness h2 of the two side edges of the painting area 10 is required to be 2 mm, 2 mm thick masking tape is set along the two side edges.

[0035] The painting tool 3 includes a handle 30, a support frame 31 connected to the handle 30, a rolling assembly 32 connected to the handle 30 or the support frame 31, and an elastic scraper 33 connected to the support frame 31; the two ends of the elastic scraper 33 along the length direction are respectively installed on two opposite sides of the support frame 31, and the lower end face of the elastic scraper 33 is a plane, and when it abuts against the painting area 10, it adaptively deforms into a smoothly transitioned arc surface, and the two side edges of the painting area 10 along the width direction are located within the two ends of the elastic scraper 33 along the length direction.

[0036] Optionally, the elastic scraper 33 is a rectangular strip structure, and the edge thickness control strip 11 can also protect the edge of the painting area 10 along the length direction. The edge thickness control strip 11 can be made of masking paper.

[0037] like Figures 1 to 2 As shown, the two orange lines are edge thickness control strips 11, which are respectively arranged on both sides of the painting area 10 along the length direction. The elastic scraper 33 extends along the length direction to the area where the two orange lines are located, and can cover the painting area 10 along the width direction of the painting area 10. When painting, first add protective paint to the painting area 10, and the handle 30 pushes the elastic scraper 33 to move along the length direction of the painting area 10, thereby achieving the effect of scraping the protective paint of the painting area 10 in the width direction and the length direction. The protective paint dropped from the painting area 10 by the elastic scraper 33 can be gathered in the area where the edge thickness control strip 11 is located under its own flow and the guidance of the elastic scraper 33, and then collected uniformly.

[0038] The rolling assembly 32 includes a roller 322 , and the roller 322 is used to roll along the extending direction of the first thickness control strip 2 in the painting area 10 .

[0039] The handle 30 is used as a hand-holding position for the operator to apply pressure to the painting tool 3 in the direction of the blade 1 to protect the thrust in the paint scraping direction and push the painting tool 3 forward in the scraping direction.

[0040] The support frame 31 supports the elastic scraper 33 and transmits the pressure applied by the handle 30 to the elastic scraper 33 .

[0041] The elastic scraper 33 can produce a certain deformation after being subjected to force to have adaptability, and cooperate with the support frame 31 to deform under the action of the handle 30. The lower end surface fits on the first thickness control strip 2 and the two edge thickness control strips 11 to adapt to the shape of the leading edge of the blade 1. Specifically, the middle part of the lower end surface of the elastic scraper 33 abuts against the top of the first thickness control strip 2, and the two sides of the lower end surface respectively abut against the top of the edge thickness control strip 11, so that the leading edge of the blade 1 uses the thickness of the first thickness control strip 2 as the glue thickness of the leading edge center line, and uses the thickness of the edge thickness control strip 11 as the glue thickness of the two side edges of the painting area 10. Through its own deformation, the height difference of the glue thickness between the first thickness control strip 2 and the edge thickness control strips 11 on both sides is uniformly transitioned to ensure the required protective paint thickness. Moreover, the lower end surface of the elastic scraper 33 forms a smoothly transitioned arc surface between the first thickness control strip 2 and the edge thickness control strips 11 on both sides under its own adaptive action, and the protective paint is scraped through the arc surface to achieve a flat and smooth surface on the blade 1 after painting, thereby improving the reliability of the blade product and reducing quality risks.

[0042] In an optional real-time method, the support frame 31 includes a top arm 310 and two side arms 311 connected to both sides of the top arm 310 by hinged connection. The two side arms 311 are bent and the two ends of the elastic scraper 33 are respectively provided on the two side arms 311. Figure 2 As shown, the two side arms 311 can be rotatably connected to the top arm 310 via a rotating shaft, so that when the elastic scraper 33 deforms and the width of the adaptive painting area 10 changes, the angle with the top arm 310 can be rotated and adjusted under the push of the elastic scraper 33 to maintain the state of automatically clamping the two sides outside the painting area 10 of the leading edge of the blade 1. The bending structure of the side arm 311 can buffer part of the force on the side arm 311 and increase the structural stability of the side arm 311.

[0043] In an optional real-time method, the side arm 311 is provided with a first mounting portion and a second mounting portion, the first mounting portion is used to connect with the end of the elastic scraper 33, and the second mounting portion is provided with an arm wheel 34. The side surfaces of the two arm wheels 34 are used to rotate and fit on both sides of the center line of the leading edge of the blade 1 and be located outside the painting area 10 when the elastic scraper 33 is scraping the protective paint, so as to reduce the friction generated by the direct contact between the side arm 311 and the leading edge of the blade 1, thereby ensuring the smooth advancement of the painting tool 3. Among them, the first mounting portion and the second mounting portion can both be mounting points, such as Figures 4 to 6 As shown, the first mounting portion can optionally be a mounting hole. The end of the elastic scraper 33 is provided with a flange, and a positioning hole is opened in the flange. After the positioning hole and the mounting hole are aligned, they are detachably connected by bolts. Optionally, the second mounting portion can be a mounting surface connected to the rotating support structure of the arm wheel 34.

[0044] In an optional real-time mode, the painting tool 3 further includes a positioning member 35, the positioning member 35 includes a vertically connected mounting rod 350 and a positioning shaft, the mounting rod 350 is mounted on the second mounting portion, and the arm wheel 34 is rotatably arranged on the positioning shaft. Figure 6 As described above, the mounting rod 350 can be fixed to the second mounting portion of the side arm 311 by bolt connection or welding, and the arm wheel 34 is rotatably mounted on the positioning shaft through the wheel hole opened therein. Through the "L"-shaped structure formed by the mounting rod 350 and the positioning shaft, when the painting tool 3 is pushed forward, the sides of the two arm wheels 34 roll along the sides of the blade 1 to assist in moving forward, thereby reducing the friction exerted on the painting tool 3.

[0045] In an optional real-time mode, the rolling assembly 32 further includes a support leg 320 connected to the handle 30 or the support frame 31, a support shaft 321 mounted on the support leg 320, and two rollers 322 located on the support shaft 321, wherein the support leg 320 is located between the two rollers 322. Figures 1 to 6 As shown, the support leg 320 can be welded or integrally formed on the support frame 31, or it can be first integrally formed with the handle 30 and then fixed together on the support frame 31. The support leg 320 is connected between the support frame 31 and the two rollers 322, or between the handle 30 and the two rollers 322, to transmit the thrust and pressure of the handle 30 to the rollers 322, ensuring that the rollers 322 move stably on the blade 1.

[0046] In an optional real-time mode, the blade protective paint scraping tool further includes two second thickness control strips 4 located on both sides of the first thickness control strip 2, and the two rollers 322 are respectively rolled on the two second thickness control strips 4. Figures 1 to 3As shown, the two second thickness control strips 4 provide an additional thickness control structure between the first thickness control strip 2 and the edge thickness control strip 11, assisting in controlling the thickness of the protective paint. When the elastic scraper 33 is scraping the glue, its lower end simultaneously abuts the first thickness control strip 2, the two second thickness control strips 4, and the two edge thickness control strips 11, increasing the accuracy of thickness control in the paint zone 10. Simultaneously, the two rollers 322 can move along the two second thickness control strips 4, preventing the rollers 322 from stagnation and affecting the protective paint.

[0047] In an alternative real-time approach, such as Figures 1 to 3 As shown, the painting tool 3 also includes a tracer pointer 36, which is installed on the support shaft 321 or the support leg 320. The tracer pointer 36 is parallel to the first thickness control strip 2 or located directly above the first thickness control strip 2 and extends in the same direction as the first thickness control strip 2. The tracer pointer 36 is used to indicate whether the painting tool 3 deviates from the scraping trajectory. During the paint scraping operation, the operator can judge whether the painting tool 3 deviates from the scraping trajectory by observing whether the tracer pointer 36 is parallel to the first thickness control strip 2 (when the tracer pointer 36 is parallel to the first thickness control strip 2) or whether it remains directly above the first thickness control strip 2 (when the tracer pointer 36 is directly above the first thickness control strip 2 and extends in the same direction as the first thickness control strip 2), and make timely adjustments if deviated.

[0048] In an optional real-time method, a heating unit and a temperature sensor are provided within the elastic scraper 33, and the painting tool 3 is provided with a temperature display in communication with the temperature sensor and a control switch for turning the heating unit on and off. The heating unit may be a heating wire embedded within the elastic scraper 33, the temperature sensor also embedded within the elastic scraper 33, and the temperature display may include a temperature display screen provided on the handle 30 or support frame 31. The heat source of the heating unit, such as a battery, may be mounted to the handle 30 or support frame 31 via bolts or other means. The control switch controls the opening and closing of the circuit formed by the heating unit and the heat source.

[0049] The operator obtains the temperature data of the elastic scraper 33 from the temperature display screen, and turns on the control switch when the temperature is lower than the minimum temperature required for painting (such as 10°C). The heating unit starts to heat the elastic scraper 33, improves the leveling of the paint by increasing the temperature, and solves the problem of uneven protective paint coating in low temperature environment.

[0050] In an optional embodiment, the top of the elastic scraper 33 is provided with a flange extending toward the roller 322. The flange can block the protective paint flowing to the top of the elastic scraper 33, preventing the protective paint from overflowing over the top of the elastic scraper 33 to the position in the painting area where the paint has been scraped by the scraping tool 3, thereby protecting the already scraped surface. The flange can be provided on the fixed edge of the elastic scraper 33 and can be provided with a plurality of strip-shaped holes arranged along the length of the elastic scraper 33. The length direction of the strip-shaped holes is parallel to the length direction of the first thickness control strip 2 or the second thickness control strip 4, so as to provide space for the elastic scraper 33 to undergo adaptive deformation.

[0051] In an optional real-time method, the elastic scraper 33 has a guide groove along its length on the side facing the roller 322. The two ends of the guide groove extend to the areas where the two edge thickness control strips 11 are located. During paint scraping, the side of the elastic scraper 33 facing the roller 322 is the side coated with protective paint to be scraped, while the side of the elastic scraper 33 facing away from the roller 322 is the side that has been painted. The guide groove can guide the protective paint scraped from the elastic scraper 33 from the middle of the elastic scraper 33 along its length to the sides, preventing the protective paint from accumulating on the elastic scraper 33.

[0052] The present application also provides a method for scraping protective paint on a wind turbine blade, wherein the protective paint is scraped on the paint area 10 by using the blade protective paint scraping tool described in any of the above embodiments, such as 1 to Figure 7 As shown, the method comprises the following steps: S1: providing edge thickness control strips 11 on both sides of the outer edges of the painting area 10 of the blade 1 to perform subsequent control and protection on both sides of the outer edges of the painting area 10; S2: providing a first thickness control strip 2 in the painting area 10 of the blade 1, wherein the first thickness control strip 2 extends along the center line direction of the leading edge of the blade 1;

[0053] S3: Apply protective paint to the painting area 10 of the blade 1, and use the painting tool 3 to scrape the protective paint. The middle part of the lower end surface of the elastic scraper 33 abuts on the first thickness control strip 2, and the two sides of the lower end surface of the elastic scraper 33 respectively abut on the two edge thickness control strips 11. Under the action of the handle 30, the roller 322 rolls forward on the blade 1; S4: After the scraping is completed, the edge thickness control strip 11 of the protective paint is removed.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A blade protective paint scraping tool, characterized in that: include: a first thickness control strip and two edge thickness control strips, wherein the first thickness control strip is used to be arranged in the painting area of the blade and extends along the centerline direction of the leading edge of the blade, and the two edge thickness control strips are used to be arranged on both side edges of the painting area of the blade; A painting tool, which includes a handle, a support frame connected to the handle, a rolling assembly connected to the handle or the support frame, and an elastic scraper connected to the support frame; the two ends of the elastic scraper along the length direction are respectively installed on two opposite sides of the support frame, and the lower end face of the elastic scraper is a plane, and when it abuts against the painting area, it adaptively deforms into a smoothly transitioned arc surface, and the two side edges of the painting area along the width direction are located within the two ends of the elastic scraper along the length direction; the rolling assembly includes a roller, and the roller is used to roll in the painting area along the extension direction of the first thickness control strip.

2. The blade protective paint scraping tool according to claim 1 is characterized in that: The support frame includes a top arm and two side arms respectively connected to both sides of the top arm in a hinged manner. The two side arms are both bent, and the two ends of the elastic scraper are respectively arranged on the two side arms.

3. The blade protective paint scraping tool according to claim 2 is characterized in that: The side arm is provided with a first mounting portion and a second mounting portion, the first mounting portion is used to be connected to the end of the elastic scraper, and the second mounting portion is provided with an arm wheel, and the side surfaces of the two arm wheels are used to rotate and fit on both sides of the center line of the leading edge of the blade and be located outside the painting area when the elastic scraper is scraping the protective paint.

4. The blade protective paint scraping tool according to claim 3 is characterized in that: The painting tool further includes a positioning member, which includes a vertically connected mounting rod and a positioning shaft. The mounting rod is mounted on the second mounting portion, and the arm wheel is rotatably arranged on the positioning shaft.

5. The blade protective paint scraping tool according to claim 1, characterized in that: The rolling assembly further includes a support leg connected to the handle or the support frame, a support shaft mounted on the support leg, and two rollers located on the support shaft, wherein the support leg is located between the two rollers.

6. The blade protective paint scraping tool according to claim 5, characterized in that: The blade protective paint scraping tool further includes two second thickness control strips respectively located on both sides of the first thickness control strip, and the two rollers are respectively rollingly arranged on the two second thickness control strips.

7. The blade protective paint scraping tool according to claim 5, characterized in that: The painting tool also includes a tracing pointer, which is installed on the support shaft or the support leg. The tracing pointer is parallel to the first thickness control strip or is located directly above the first thickness control strip and extends in the same direction as the first thickness control strip.

8. The blade protective paint scraping tool according to any one of claims 1 to 7, characterized in that: A heating unit and a temperature sensor are provided in the elastic scraper, and a temperature display connected to the temperature sensor and a control switch for controlling the opening and closing of the heating unit are provided on the painting tool.

9. The blade protective paint scraping tool according to any one of claims 5 to 7, characterized in that: The top of the elastic scraper is provided with a flange extending toward the roller.

10. A method for scraping protective paint on a wind turbine blade, comprising scraping protective paint on a painted area using the blade protective paint scraping tool according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Edge thickness control strips are provided on both sides of the outer edges of the painting area of the blade to control and protect the thickness of the outer edges of the painting area; S2: providing a first thickness control strip in the painting area of the blade, wherein the first thickness control strip extends along the center line of the leading edge of the blade; S3: Apply protective paint to the painting area of the blade, and use a painting tool to scrape the protective paint. The middle of the lower end surface of the elastic scraper abuts against the first thickness control strip, and both sides of the lower end surface of the elastic scraper abut against the two edge thickness control strips respectively. Under the action of the handle, the roller rolls forward on the blade; S4: After the scraping is completed, remove the edge thickness control strip of the protective paint.

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