Wind power blade tip damage maintenance method

Abstract

The invention discloses a wind power blade tip damage maintenance method. The method comprises the steps that S1, an inner lining plate and an outer lining plate are prefabricated; s2, detecting and marking a damaged area; s3, cutting and polishing a damaged area; s4, preprocessing the lightning protection system; s5, bonding the outer lining plate; s6, repairing the skin and the core material; s7, the aluminum blade tip and the lightning protection system are installed; s8, repairing the PS surface; and S9, repairing quality detection. According to the method, through standardized lining plate prefabrication, precise damage treatment, layered curing and bonding and strict quality verification, efficient and precise repair of blade tip damage is achieved, the repair precision, efficiency and reliability are improved, the blade safety is guaranteed, and the quality stability of the wind power blade is effectively enhanced.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a method for repairing tip damage of wind turbine blades. Background Technology

[0002] Wind turbine blade tips are constantly exposed to complex wind field environments, making them susceptible to damage from airflow impacts and foreign object collisions. Common problems include skin cracking, core material damage, aluminum tip detachment, and lightning protection system failure. Traditional repair methods have significant drawbacks: First, the liner fabrication has poor compatibility with the blade profile, and on-site cutting and processing can easily lead to loose bonding, affecting repair strength; second, the repair process lacks standardized staggered grinding and curing parameter control, which can easily lead to secondary failures such as stress concentration and weak adhesion; third, insufficient conductor protection during lightning protection system repair often results in excessive resistance due to improper operation, affecting the safe operation of the blade; and fourth, the repair cycle is long, the procedures are redundant, and the overall repair cost remains high.

[0003] Therefore, developing a blade tip damage repair technology that is highly adaptable, has high repair accuracy, and has a standardized process has become a technical bottleneck that urgently needs to be solved in the field of wind power operation and maintenance. Summary of the Invention

[0004] Therefore, it is necessary to provide a method for repairing tip damage of wind turbine blades to address the aforementioned technical problems.

[0005] A method for repairing tip damage of a wind turbine blade includes the following steps: S1: prefabrication of inner and outer liner plates; S2: detection and marking of damaged areas; S3: cutting and grinding of damaged areas; S4: pretreatment of lightning protection system; S5: bonding of outer liner plates; S6: repair of skin and core material; S7: installation of aluminum blade tip and lightning protection system; S8: repair of PS surface; S9: repair quality inspection.

[0006] Further, step S1 includes: during the same type of blade shell layup stage, sequentially lay up a release film, a release cloth, two layers of 800g / m²±45° biaxial fabric, a release cloth, and a release film on the PS surface corresponding to the inner liner plate area, and integrally cast and cured with the shell. After demolding, trim the leading and trailing edges to obtain the inner liner plate; select the same type of blank blade that has just been demolded, apply a release agent to the defect areas on the SS and PS surfaces, and after drying, sequentially lay up a release film and a release cloth, hand lay up two layers of 800g / m²±45° biaxial fabric, cover the outer layer with the release cloth, and trim after curing to obtain the outer liner plate.

[0007] Further, step S2 includes: sanding the surface paint and putty of the defective area, using a strong flashlight to detect the extent of cracking of the structural adhesive at the tip and front and rear edges of the web, and marking the damaged area at the blade tip.

[0008] Further, step S3 includes: using a cutting machine and an angle grinder in combination, cutting off the damaged area of ​​the PS surface along the axial direction according to the damaged area of ​​the blade tip, grinding and removing the damaged skin of the SS surface down to the leading edge connecting corner fabric layer, and removing the failed adhesive; according to the design delamination requirements, performing staggered grinding on the broken skin of the PS surface and SS surface, removing the leading edge connecting corner and cracked adhesive, extending the grinding range towards the blade root direction to a set length, and processing it into a rough surface.

[0009] Furthermore, step S4 includes: cutting and stripping the broken terminal block, checking the integrity of the lightning protection conductor, using a copper tube to press the damaged conductor, and replacing it with a product of the same specification and model.

[0010] Further, step S5 includes: using a fast structural adhesive to bond the SS surface outer liner to the corresponding area, and after curing, laying a release film and a release cloth sequentially on the inner surface of the outer liner.

[0011] Further, step S6 includes: hand lay-up the outer skin on the SS surface outer liner according to the staggered dimensions, impregnate the core material with hand lay-up resin and fill the damaged area so that the core material gap is less than or equal to the gap threshold, cover with release cloth and surface dry, then heat-cur at a set temperature; after the core material is cured, remove the release cloth and sand it according to the shape, hand lay-up the inner skin according to the delamination requirements, cover with release cloth and surface dry, then heat-cur at a set temperature, and make its Shore hardness greater than or equal to the hardness threshold.

[0012] Further, step S7 includes: removing the release cloth from the SS surface, connecting the lightning protection wire terminal to the aluminum blade tip using hexagonal bolts and flat washers, applying a thick adhesive within a set thickness range to the bonding area of ​​the aluminum blade tip, placing the aluminum tip, and then pressing and fixing it with F clamps; completing the fastening of the lightning protection assembly, and testing the resistance between the aluminum blade tip and the blade root tip to ensure that the resistance value is less than or equal to the resistance threshold.

[0013] Further, step S8 includes: cutting the PS inner liner into three pieces, corresponding to the front edge, rear edge, and middle area respectively; applying structural adhesive of a set thickness and width to the front and rear edge surfaces of the SS inner skin, bonding the inner liner to the front and rear edges of the PS, squeezing out excess adhesive, and heating to cure at a set temperature; removing and bonding the release cloth from the PS middle inner liner, hand-laying back the inner skin according to the delamination size, filling the core material, making the gap less than or equal to the gap threshold, covering with release cloth, and heating to cure at a set temperature after surface drying; sanding the PS surface core material and shaping it, hand-laying back the outer skin, overlapping it on the SS side according to the set size, covering with release cloth to remove air bubbles, and heating to cure at a set temperature after the outer liner passes inspection, making its Shore hardness greater than or equal to the hardness threshold.

[0014] Furthermore, step S9 includes: after the repair is completed, a resistance test is performed to check the performance of the lightning protection system; if the performance of the lightning protection system is qualified, coating repair is carried out to complete the overall repair of the blade.

[0015] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: by prefabricating inner and outer lining plates, detecting and marking damaged areas, cutting and grinding damaged areas, pre-treating the lightning protection system, bonding the outer lining plate, repairing the skin and core material, installing the aluminum blade tip and lightning protection system, repairing the PS surface, and finally conducting repair quality inspection, the present invention achieves efficient and precise repair of blade tip damage through standardized lining plate prefabrication, precise damage treatment, layered curing and bonding, and strict quality verification, thereby improving repair accuracy, efficiency and reliability, ensuring blade safety, and effectively enhancing the quality stability of wind turbine blades. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating a method for repairing tip damage of a wind turbine blade in one embodiment. Figure 2 Here is a schematic diagram of the grinding of the SS surface and the PS surface in one embodiment, wherein (1) is a schematic diagram of the front and rear edges of the wind turbine blade, and (2) is a cross-sectional view of Figure (1) along the AA direction; Figure 3 This is a schematic diagram of the bonding of aluminum blade tips in one embodiment; Figure 4 This is a schematic diagram of the bonding of the PS surface inner lining plate in one embodiment; Figure 5 Here is a schematic diagram of the bonding of the front and rear edge inner lining plates of the PS in one embodiment, wherein (1) is a schematic diagram of applying structural adhesive to the front and rear edge surfaces, (2) is a cross-sectional view of Figure (1) along the BB direction, and (3) is a schematic diagram of the bonding of the front and rear edge inner lining plates of the PS. Figure 6 This is a schematic diagram illustrating the repair of the PS surface in one embodiment. Detailed Implementation

[0017] To make the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, a method for repairing tip damage of a wind turbine blade is provided, including the following steps: Step S1: Prefabricate the inner lining plate and the outer lining plate.

[0019] Step S1 includes: during the same type of blade shell layup stage, a release film, a release cloth, two layers of 800g / m±45° biaxial fabric, a release cloth, and a release film are sequentially laid on the PS surface corresponding to the inner liner area. The release film is integrally poured and cured with the shell. After demolding, the leading and trailing edges are trimmed to obtain the inner liner. Select the same type of blank blade that has just been demolded, apply a release agent to the defect areas on the SS and PS surfaces, and after drying, lay the release film and release cloth sequentially. Hand lay up two layers of 800g / m±45° biaxial fabric, cover the outer layer with the release cloth, and trim after curing to obtain the outer liner.

[0020] Specifically, during the prefabrication of the inner liner, in the same type of blade shell layering stage in the factory, the isolation film, release cloth, 2 layers of 800g / m²±45° biaxial cloth, release cloth, and isolation film are sequentially laid in the corresponding area of ​​the PS surface, and integrally poured and cured with the shell; after tearing the mold, its leading edge and trailing edge are trimmed to ensure the conformability of the inner liner.

[0021] When prefabricating the outer liner, select the same type of blank blade that has just been demolded, apply release agent to the defect areas on the SS and PS surfaces, and after drying, lay out the release film and release cloth in sequence, hand lay up two layers of 800g / m²±45° biaxial cloth, cover the outer layer with release cloth, and trim after curing to ensure the conformity of the outer liner.

[0022] Through the above steps, the inner and outer liners are prefabricated in the same factory and integrally formed with the blade, ensuring a precise fit with the blade profile. In addition, the prefabricated inner and outer liners can save on-site cutting and debugging time and improve maintenance efficiency.

[0023] Step S2: Damage area detection and marking.

[0024] Step S2 includes: sanding the surface paint and putty of the defective area, using a strong flashlight to detect the extent of cracking of the structural adhesive at the tip of the web and the front and rear edges, and marking the damaged area at the blade tip.

[0025] Specifically, the surface paint and putty of the defective area are sanded, and a strong flashlight is used to detect the extent of cracking of the structural adhesive at the tip and front and rear edges of the blade. The damaged area at the blade tip is marked, and the boundary of the area to be repaired at the blade tip is clearly defined to facilitate subsequent maintenance operations.

[0026] Step S3: Cutting and grinding the damaged area.

[0027] Step S3 includes: using a cutting machine and an angle grinder together, cutting off the damaged area of ​​the PS surface along the axial direction according to the damaged area of ​​the blade tip, grinding and removing the damaged skin of the SS surface up to the leading edge connecting corner fabric layer, and removing the failed adhesive; according to the design delamination requirements, performing staggered grinding on the broken skin of the PS surface and SS surface, removing the leading edge connecting corner and cracked adhesive, extending the grinding range towards the blade root direction to a set length, and processing it into a rough surface.

[0028] Specifically, a cutting machine and an angle grinder are used together to cut off the damaged area of ​​the PS surface along the axis based on the marked blade tip damage area, grind and remove the damaged skin of the SS surface up to the leading edge connecting angle cloth layer, remove the failed adhesive, and avoid damage to the lightning protection conductor, web plate and main beam throughout the process.

[0029] like Figure 2 As shown, according to the delamination requirements of the blade design, the skin at the fracture points of the PS and SS surfaces is subjected to staggered grinding. The delamination requirements for uniaxial and biaxial fabrics are different. When grinding biaxial fabric, the axial-chordal delamination requirement can be set to 50mm. When grinding uniaxial fabric, the axial delamination requirement can be set to 100mm and the chordal delamination requirement can be set to 10mm. Step-like progressive grinding ensures a smooth transition between the repaired area and the original structure, avoiding stress concentration. After grinding, the leading edge connection corner and cracked adhesive are removed, and the grinding range is extended towards the blade root by a set length, such as 200mm, and then processed into a rough surface.

[0030] Step S4, lightning protection system preprocessing.

[0031] Step S4 includes: cutting and stripping the broken terminal block, checking the integrity of the lightning protection conductor, using a copper tube to press the damaged conductor, and replacing it with a product of the same specification and model.

[0032] Specifically, cut open and strip the broken terminals, check the integrity of the lightning protection conductors, verify the component connection status, protection coverage, and system aging level; crimp the damaged conductors with copper pipes and replace them with products of the same specifications and models to ensure that the lightning protection system can safely discharge lightning current and prevent blade damage.

[0033] Step S5: Bonding the outer lining plate.

[0034] Step S5 includes: using a fast structural adhesive to bond the outer lining plate of the SS surface to the corresponding area, and after curing, laying a release film and a release cloth on the inner surface of the outer lining plate in sequence.

[0035] Specifically, the outer lining plate of the SS surface is bonded to the corresponding SS surface area using quick structural adhesive. After the structural adhesive has cured, a release film and a release cloth are laid sequentially on the inner surface of the outer lining plate.

[0036] Step S6, skin and core material repair.

[0037] Step S6 includes: hand lay-up the outer skin on the outer liner plate of the SS surface according to the delamination size, impregnate the core material with hand lay-up resin and fill the damaged position so that the core material gap is less than or equal to the gap threshold, cover with release cloth and surface dry, and heat-cur at a set temperature; after the core material is cured, remove the release cloth and sand it according to the shape, hand lay-up the inner skin according to the delamination requirements, cover with release cloth and surface dry, heat-cur at a set temperature, and make its Shore hardness greater than or equal to the hardness threshold.

[0038] Specifically, the outer skin is restored by hand lay-up on the outer lining plate of the SS surface according to the delamination size (so that it is consistent with the original fabric layer specifications). The core material is impregnated with hand lay-up resin and filled to the damaged position, ensuring that the core material gap is ≤ the gap threshold. The gap threshold can be set to 2mm. After covering with release cloth, it is surface dried. The temperature is set, for example, 70℃, and heated for 6 hours for curing.

[0039] After the core material has cured, remove the release cloth and sand it to conform to the shape. Hand lay up the inner skin according to the staggered layer requirements. After the surface is dried by covering with the release cloth, heat and cure at a set temperature, such as 70°C, for 6 hours to ensure that the Shore hardness is ≥ the hardness threshold. The hardness threshold can be set to 60HD.

[0040] Step S7: Install aluminum blade tip and lightning protection system.

[0041] Step S7 includes: removing the release cloth from the SS surface, connecting the lightning protection conductor terminal to the aluminum blade tip using hexagonal bolts and flat washers, applying a thick adhesive within a set thickness range to the bonding area of ​​the aluminum blade tip, placing the aluminum tip, and then pressing and fixing it with F clamps; completing the fastening of the lightning protection assembly, and testing the resistance between the aluminum blade tip and the blade root tip to ensure that the resistance value is less than or equal to the resistance threshold.

[0042] Specifically, remove the release cloth from the SS surface, connect the lightning protection conductor terminal to the aluminum blade tip using hexagonal bolts and flat washers, apply a 10±2mm thick layer of adhesive to the bonding area of ​​the aluminum blade tip, place the aluminum blade tip, and then press it firmly with F-clamps. After bonding, the aluminum blade tip should appear as follows: Figure 3 As shown.

[0043] After securing the lightning arrester assembly, if a broken wire is detected, a copper tube can be used for connection. Test the resistance between the aluminum tip and the blade root to ensure that the resistance value is less than or equal to the resistance threshold, which can be set to 50mΩ.

[0044] The above steps complete the installation of the lightning protection system, preventing damage to blades, insulation breakdown of equipment, and other malfunctions caused by lightning strikes.

[0045] Step S8, PS surface repair.

[0046] Step S8 includes: cutting the PS inner liner into three pieces, corresponding to the front edge, rear edge, and middle area respectively; applying structural adhesive of a set thickness and width to the front and rear edge surfaces of the SS inner skin, bonding the inner liner to the front and rear edges of the PS, squeezing out excess adhesive, and heating to cure at a set temperature; removing and bonding the release cloth from the PS middle inner liner, hand-laying back the inner skin according to the delamination size, filling the core material, making the gap less than or equal to the gap threshold, covering with release cloth, and heating to cure at a set temperature after surface drying; sanding the PS surface core material and shaping it, hand-laying back the outer skin, overlapping it on the SS side according to the set size, covering with release cloth and rolling out air bubbles, and heating to cure at a set temperature after the outer liner passes inspection, making its Shore hardness greater than or equal to the hardness threshold.

[0047] Specifically, the PS lining board is cut into 3 pieces (the width of the front and rear edges can be set to 100-150mm), corresponding to the front edge area, rear edge area, and middle area respectively. The three lining boards are then glued to the corresponding areas of the PS surface, as shown below. Figure 4 As shown in the figure, ① represents the rear edge inner lining plate of the PS surface, ② represents the middle inner lining plate of the PS surface, and ③ represents the front edge inner lining plate of the PS surface.

[0048] When bonding the PS inner lining panel, such as Figure 5 As shown, apply structural adhesive (adhesive) of a set thickness, such as 3-5 mm, and a set width, such as 80 mm, to the front and rear edge surfaces of the SS inner skin. Attach the inner lining plates of the front and rear edges of the PS, squeeze out excess adhesive, and heat to a set temperature, such as 70°C, for 6 hours to cure.

[0049] Remove the release cloth from the PS inner liner and bond it. Hand lay up the inner skin according to the delamination size, fill the core material, make the gap ≤2mm, cover with release cloth, and after surface drying, heat at 70℃ for 6 hours to cure.

[0050] Sand the PS core material and shape it accordingly. Hand lay up the outer skin and overlap it with the SS side according to the set size, such as 50mm. Cover it with release cloth and roll out the air bubbles. After the outer liner plate is inspected and approved, heat it at 70℃ for 6 hours to ensure that the Shore hardness is ≥60HD.

[0051] After repairing the PS surface using the above steps, the repaired PS surface looks like this. Figure 6 As shown in the figure, ① represents the trailing edge inner liner of the PS surface, ② represents the middle inner liner of the PS surface, and ③ represents the front edge inner liner of the PS surface. The quality stability of the blade is improved by repairing the tip damage.

[0052] Step S9, Repair Quality Inspection.

[0053] Step S9 includes: after the repair is completed, a resistance test is performed to check the performance of the lightning protection system; if the performance of the lightning protection system is qualified, the coating repair is carried out to complete the overall repair of the blade.

[0054] Specifically, after the repair is completed, a resistance test is required to confirm that the lightning protection system is up to standard. After confirmation, coating repair is carried out to complete the overall blade repair operation, resulting in a wind turbine blade with high reliability and strong quality stability.

[0055] In this embodiment, by prefabricating inner and outer liner plates, the damaged area is detected and marked, the damaged area is cut and polished, the lightning protection system is pre-treated, the outer liner plate is bonded, the skin and core material are repaired, the aluminum blade tip and lightning protection system are installed, the PS surface is repaired, and finally the repair quality is inspected. Through standardized liner plate prefabrication, precise damage treatment, layered curing and bonding, and strict quality verification, efficient and precise repair of blade tip damage is achieved, improving repair accuracy, efficiency and reliability, ensuring blade safety, and effectively enhancing the quality stability of wind turbine blades.

[0056] Compared with the prior art, the present invention has the following beneficial effects: First, the repair precision and reliability are improved. By using a prefabricated liner integrally formed with the blade in the factory, precise fit with the blade profile is ensured. Combined with standardized staggered grinding and curing processes, stress concentration is avoided, and the bonding strength is highly consistent with the original structure, significantly reducing the risk of secondary failures.

[0057] Second, ensuring the safety of the lightning protection system. During maintenance, conductor protection and resistance testing are strengthened, and standardized connection methods such as copper pipe crimping and bolt tightening are adopted to ensure that the lightning protection system resistance is ≤50mΩ, meeting the requirements for safe operation.

[0058] Third, maintenance efficiency is improved. Precast lining plates eliminate on-site cutting and debugging time, and standardized processes reduce redundancy in procedures, shortening the maintenance cycle by more than 40% compared to traditional methods, thus improving the response speed of wind power equipment operation and maintenance.

[0059] Fourth, optimized adaptability and economy. No modification to existing maintenance equipment is required; it can be adapted to blades of the same model but with varying degrees of damage, reducing material waste and labor input, and significantly lowering overall maintenance costs.

[0060] Fifth, enhanced quality stability. Key parameters such as curing temperature (70℃), time (6h), and core material gap (≤2mm) are clearly defined, and quality standards such as Shore hardness (≥60HD) are standardized to ensure consistent repairs under different repair scenarios.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0062] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for repairing tip damage of a wind turbine blade, characterized in that, Includes the following steps: S1: Precast inner and outer lining panels; S2: Damage area detection and marking; S3: Cutting and grinding of the damaged area; S4: Lightning protection system preprocessing; S5: Outer lining panel bonding; S6: Skin and core material repair; S7: Installation of aluminum blade tips and lightning protection system; S8: PS surface repair; S9: Repair quality inspection.

2. The method for repairing tip damage of a wind turbine blade according to claim 1, characterized in that, Step S1 includes: During the same type of blade shell layup stage, the isolation film, release cloth, two layers of 800g / m²±45° biaxial cloth, release cloth and isolation film are sequentially laid on the PS face corresponding to the inner liner plate area. They are integrally poured and cured with the shell. After demolding, the leading edge and trailing edge are trimmed to obtain the inner liner plate. Select the same type of blank blade that has just been demolded, apply the release agent to the defect areas on the SS and PS surfaces, and after drying, lay the release film and release cloth in sequence. Hand lay up two layers of 800g / m²±45° biaxial cloth, cover the outer layer with release cloth, and trim after curing to obtain the outer liner.

3. The method for repairing tip damage of a wind turbine blade according to claim 1, characterized in that, Step S2 includes: The surface paint and putty of the defective area were sanded off, and a strong flashlight was used to detect the extent of cracking of the structural adhesive at the tip and front and rear edges of the blade, marking the damaged area at the blade tip.

4. The method for repairing tip damage of a wind turbine blade according to claim 3, characterized in that, Step S3 includes: Using a cutting machine and an angle grinder, the PS surface blade tip damage area is cut off along the axial direction according to the blade tip damage area. The damaged skin on the SS surface is ground and removed up to the leading edge connecting angle cloth layer, and the failed adhesive is removed. According to the design delamination requirements, the skin at the fracture points of the PS and SS surfaces is sanded in a staggered manner to remove the leading edge connection corners and cracked adhesive. The sanding range is extended to a set length towards the leaf root and processed into a rough surface.

5. A method for repairing tip damage of a wind turbine blade according to claim 1, characterized in that, Step S4 includes: Cut open and strip the broken terminal block, check the integrity of the lightning protection conductor, use copper tubing to press the damaged conductor, and replace it with a product of the same specification and model.

6. The method for repairing tip damage of a wind turbine blade according to claim 1, characterized in that, Step S5 includes: Using a fast structural adhesive, the outer lining plate of the SS surface is bonded to the corresponding area. After curing, a release film and a release cloth are sequentially laid on the inner surface of the outer lining plate.

7. The method for repairing tip damage of a wind turbine blade according to claim 1, characterized in that, Step S6 includes: On the outer liner of the SS surface, the outer skin is restored by hand lay-up according to the staggered layer size. The core material is impregnated with hand lay-up resin and filled to the damaged position so that the core material gap is less than or equal to the gap threshold. After covering with release cloth and surface drying, it is heated and cured at the set temperature. After the core material has cured, remove the release cloth and sand it according to the shape. Hand lay up the inner skin according to the delamination requirements, cover it with the release cloth and let it dry on the surface. Then heat it at the set temperature to cure it and make its Shore hardness greater than or equal to the hardness threshold.

8. A method for repairing tip damage of a wind turbine blade according to claim 1, characterized in that, Step S7 includes: Remove the release cloth from the SS surface, connect the lightning protection wire terminal to the aluminum blade tip using hexagonal bolts and flat washers, apply thick adhesive within the set thickness range to the bonding area of ​​the aluminum blade tip, and then use F-clamps to press and fix it after placing the aluminum tip. After securing the lightning arrester assembly, test the resistance between the aluminum blade tip and the blade root tip, ensuring the resistance value is less than or equal to the resistance threshold.

9. A method for repairing tip damage of a wind turbine blade according to claim 1, characterized in that, Step S8 includes: The PS lining panel is cut into three pieces, corresponding to the front edge, rear edge, and middle area respectively; Apply structural adhesive of a set thickness and width to the front and rear edges of the SS inner skin, bond the inner lining plates of the front and rear edges of the PS, squeeze out excess adhesive, and heat to cure at a set temperature; Remove the release cloth from the PS middle inner liner and bond it. Hand lay up the inner skin according to the delamination size, fill the core material, and make the gap less than or equal to the gap threshold. Then cover with the release cloth and heat to cure at the set temperature after surface drying. The PS core material is sanded and molded, and the outer skin is restored by hand lay-up. It is then overlapped on the SS side according to the set dimensions. The release cloth is covered and the air bubbles are rolled out. After the outer liner plate passes inspection, it is heated and cured at the set temperature so that its Shore hardness is greater than or equal to the hardness threshold.

10. A method for repairing tip damage of a wind turbine blade according to claim 1, characterized in that, Step S9 includes: After the repair is completed, a resistance test is performed to check the performance of the lightning protection system; If the lightning protection system performs well, then coating repair will be carried out to complete the overall repair of the blades.

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