Wrinkle-free forming method for rear edge bonding angle of wind power blade

Abstract

The invention relates to the field of wind power blade bonding die design, and discloses a wind power blade rear edge bonding angle wrinkle-free forming method which comprises the steps that a lining plate is prepared, and a lining plate molded surface is matched with the outer offset thickness of a theoretical model of a wind power blade rear edge bonding angle; engraving a diversion trench pre-forming track on the surface of the wood substitute model, pasting a glass fiber adhesive tape or a double-faced adhesive tape on the surface of the peripheral area, and pasting double-shaft cloth on the whole; the double-shaft cloth is sequentially covered with a porous membrane and a flow guide net, and a glue injection pipe is placed in the center of the flow guide net; the periphery is sealed and vacuum, a glue injection port is connected, and a cloth layer is poured and solidified in vacuum; the vacuum and auxiliary materials are torn off, edge shaping is conducted on the obtained lining plate blank with the glue injection pipe, and drilling is conducted on the surface of the lining plate blank; and forming a rear edge bonding angle, wherein the prepared lining plate and the suspended bonding angle are jointly poured or respectively poured and formed. The method is easy to operate, clear in manufacturing route, reliable in product quality and efficient in production and manufacturing.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade bonding mold design, specifically to a wrinkle-free molding method for the trailing edge bonding angle of wind turbine blades. Background Technology

[0002] To improve energy capture efficiency, wind turbines are becoming increasingly larger in capacity, with blade lengths exceeding 100 meters. These long, flexible wind turbine blades, often exceeding 100 meters in length, are highly sensitive to structural design; even minor damage or factors that degrade material or interface properties can lead to overall blade failure. The leading and trailing edge bonding angles of wind turbine blades are a critical structural area. The trailing edge bonding angle, in particular, often exhibits a drooping state, which can easily lead to resin accumulation or surface deviations, thus affecting the overall blade bonding quality. Therefore, optimizing the forming method for wind turbine blade bonding angles, ensuring the structural performance of wind turbine blades, and achieving high-quality, wrinkle-free forming of the trailing edge bonding angles of large blades are of significant importance for the normal operation of wind turbine blades and the turbine itself.

[0003] Large wind turbine blades, exceeding 100 meters in length, are extremely important for design safety, and the trailing edge bonding angle is a crucial component of the entire bonding structure. Operational cracking and even blade breakage caused by using spray adhesive for shaping and fixing are not uncommon, resulting in significant economic losses. To address the molding technology challenges of overhanging trailing edge bonding angles in large wind turbine blades, in addition to strengthening operational process management, it is essential to research corresponding technological methods and fully utilize existing materials and technologies to create molding methods with better manufacturing quality and more stable efficiency, thereby ensuring maintenance quality.

[0004] CN119871957A discloses a method for manufacturing a wind turbine blade, a wind turbine blade, and a wind turbine generator set. The method for manufacturing the wind turbine blade includes: providing a mold, the mold including a flanged truncated beam extending from its outer edge; laying a trailing edge bonding corner, the trailing edge bonding corner including an integral first bonding corner portion and a second bonding corner portion, the first bonding corner portion being laid against the inner surface of the mold, and the second bonding corner portion being laid on the flanged truncated beam; sequentially placing a mold-fitting component and an anti-movement prefabricated component on the first bonding corner portion, wherein the anti-movement prefabricated component includes a mating surface and a bonding corner adhesive surface, the mold-fitting component includes a mold-fitting component inclined surface, the mating surface abutting with the mold-fitting component inclined surface; folding the second bonding corner portion and bonding it to the bonding corner adhesive surface to form a mold-fitting component fixing structure. This application mainly addresses the problems of wrinkles and flatness in the transition area between the trailing edge bonding corner and the mold-fitting PVC, but there is currently no good method for controlling the bonding corner in a flat and vertical state.

[0005] CN118769567A discloses a method for controlling cuts at the bonding corners of wind turbine blades, belonging to the field of wind turbine blade manufacturing technology. It solves the problem that wrinkles in the fabric layer easily occur during the manufacturing process of the bonding corners of wind turbine blades, leading to easy cuts in the bonding corner fabric layer during the removal of excess material. The invention includes the following steps: A) Fabric layer laying; B) Bonding corner tooling optimization: The bonding corner tooling is attached to the mold closing seam, and a 3-6mm sharp corner is made according to the mold surface; C) Auxiliary material arrangement in the bonding corner area: Continuous felt is laid inside the bonding corner and fixed using spray adhesive to ensure that the continuous felt adheres firmly to the bonding corner fabric layer; D) Positioning of the bonding corner tooling; E) Mold closing: The bonding corner is re-inspected and confirmed to ensure it does not extend beyond the mold closing seam; F) Excess material treatment: After the blade is demolded, the front and rear edges of the excess material are cut to verify that there is no risk of cuts at the bonding corner. This invention reduces or prevents damage caused by worker operation by using additional padding fabric, but it does not significantly improve the quality of the bonding corner molding.

[0006] CN220447251U discloses a trailing edge bonding angle mold for wind turbines, relating to the field of wind turbine blade manufacturing technology. The mold includes: a core having a conforming surface and a mating surface that fit the shape of the trailing edge bonding angle of the wind turbine blade shell mold; an inner core layer assembly fitted to the conforming surface of the core, also fitting the shape of the trailing edge bonding angle of the wind turbine blade shell mold; and an outer core layer assembly fitted to the mating surface of the core. This trailing edge bonding angle mold for wind turbines, with an inner core layer assembly and an outer core layer assembly respectively provided on the conforming surface and mating surface of the core, ensures that the trailing edge bonding angle subsequently manufactured using this mold fits the trailing edge of the wind turbine blade. The core is a single integral structure, extending the mold's lifespan. This invention mainly increases the rigidity of the bonding angle mold of wind turbine blades by using a sandwich structure, without improving the bonding angle forming method.

[0007] CN115027076A discloses a method for manufacturing a bonding angle mold for wind turbine blades. This method includes manufacturing a leading edge bonding angle mold, manufacturing a trailing edge bonding angle mold, installing the bonding angle mold positioning block, and manufacturing and bonding the leading and trailing edge bonding angles. The manufacturing of the leading and trailing edge bonding angle molds sequentially includes mold cleaning and preparation, laying structural layers, laying auxiliary materials, molding, bonding, and shaping. The manufacturing and bonding of the leading and trailing edge bonding angles includes the following steps: laying the blade structural layers, laying the bonding angle transition layers, laying the bonding angle layers, placing the bonding angle molds, molding the bonding angles, shaping the bonding angles, testing the bonding angle gaps, and bonding the bonding angles. This invention mainly provides a molding method for bonding angle mold tooling, but it does not improve the molding of special irregularly shaped bonding angles.

[0008] CN209141488U discloses a wind turbine blade trailing edge bonding angle forming device, comprising: a mold having a cavity for blade forming; a fiberglass cloth layer A; a fiberglass cloth layer B; a foam core block with a surface covered by a fiberglass cloth layer C; and a release cloth layer; the blade is housed in the cavity, the fiberglass cloth layer A is laid on the surface of the trailing edge region of the blade, the foam core block is disposed on the surface of the fiberglass cloth layer A located in the trailing edge region of the blade; the fiberglass cloth layer B is laid on the surface of the foam core block and covers the foam core block, and the release cloth layer is laid on the surface of the fiberglass cloth layer B. The core mold module in this method is height-limited and cannot be applied to wind turbine blades with blunt trailing edge structures.

[0009] CN103395213A discloses a manufacturing process for a megawatt-level blade trailing edge bonding angle, comprising the following steps: (1) using PVC foam board to make a bonding angle male mold, the outer surface of which is the forming surface of the bonding angle inner cavity; (2) performing bonding angle layup, consisting of 4 layers of biaxial stitch-woven felt and 1 layer of triaxial stitch-woven felt; (3) laying the bonding angle layup directly on the male mold; (4) after laying the layup, laying the release cloth, guide net, and vacuum injection pipe on the layup surface in sequence, then covering it with a vacuum bag and sealing it; evacuating to a vacuum degree of -0.06 to -0.08 atm, and injecting 20 to 50 kg of epoxy resin for wind turbine blades through the vacuum injection pipe while evacuating; (5) after injecting epoxy resin, treating at 70 to 80°C for 3 to 5 hours, removing the vacuum bag, and thus obtaining the trailing edge bonding angle. This method increases the number of processes and labor by prefabricating the trailing edge bonding angle separately, thus reducing the molding efficiency.

[0010] In summary, the forming defects of the horizontal and vertical trailing edge bonding angle of ultra-large wind turbine blades have had a significant impact on the forming quality of the blades and the safety of product operation. Deviations in the profile and the application of special adhesive spraying will seriously affect the quality of the blades, and may even cause the blades to crack and break during operation. Summary of the Invention

[0011] To address the aforementioned technical shortcomings, the present invention aims to provide a wrinkle-free molding method for the trailing edge bonding angle of wind turbine blades. The method designs a high-quality, wrinkle-free, integral molding technique for the trailing edge bonding angle of ultra-large blades in a flat-suspended state, thereby achieving wrinkle-free molding, eliminating potential hazards, improving product quality and maintenance efficiency, and demonstrating promising prospects and good returns.

[0012] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a wrinkle-free forming method for the trailing edge bonding angle of a wind turbine blade, comprising: The liner is prepared such that the liner profile is matched with the theoretical model of the bonding angle of the trailing edge of the wind turbine blade by an external offset thickness, which is calculated by a thickness formula. Carve the pre-formed trajectory of the flow channel on the surface of the substitute wood model, and at the same time apply fiberglass tape or double-sided tape to the surface of the surrounding area of ​​the substitute wood model, and apply biaxial cloth to the whole. A porous membrane and a flow guide net are sequentially covered on top of the biaxial fabric, and an injection tube is placed in the center of the flow guide net. The surrounding area is sealed under vacuum, and an injection port is connected. The fabric layer is vacuum-injected and cured to obtain a liner blank with an injection tube. Remove the vacuum and auxiliary materials, and preliminarily obtain the blank of the liner with the glue injection tube. Trim the edges and drill holes on its surface as stitching fixing holes for fixing with the adhesive corner tooling. The trailing edge bonding corner is formed by casting the prepared liner and the suspended bonding corner together or separately.

[0013] Furthermore, the thickness formula is as follows: Outer offset thickness = Theoretical fabric thickness × Number of layers + Die pre-deformation × K + 2mm Wherein, K=1.05-1.12, which is automatically adjusted according to the blade length and surface curvature.

[0014] Furthermore, when laying biaxial fabric, a 45° oblique layup method is adopted, with the warp and weft directions of each layer of fabric forming a 45° angle with the direction of the principal stress of the bonding angle.

[0015] Furthermore, when preparing the liner, the guide net is 50mm from the edge of the fabric layer, the porous membrane is 30mm from the edge of the fabric layer, and the positioning tolerance is ±10mm; the glue injection tube is 50mm from the edge of the guide net.

[0016] Furthermore, the prepared liner and the suspended bonding angle are jointly injected with the following: 1) Place the prepared liner at the designated connection position, and then attach double-sided tape, flow guide mesh, porous membrane, release cloth and adhesive corner structure cloth layer to the surface of the liner in sequence; 2) Place and fix the adhesive corner fixture with fixing holes in the designated position, lift the liner with the adhesive corner fabric layer, and place it in the same position as the adhesive corner fixture. At the same time, use yarn to pass through the liner and the corresponding sewing fixing holes of the adhesive corner fixture to fix the liner to the adhesive corner fixture. 3) Overlap the guide net in the cavity with the guide net in the bonding corner area, seal and wrap with a vacuum film, evacuate to the qualified vacuum pressure drop, then perform vacuum infusion and heat curing; 4) After curing, remove the vacuum auxiliary material, cut the yarn, remove the liner, and check the molding quality.

[0017] Furthermore, the process of separately injecting the prepared liner and the suspended bonding angle includes: 1) Place the prepared liner at the designated connection position, and then attach double-sided tape, flow guide mesh, porous membrane, release cloth and adhesive corner structure cloth layer to the surface of the liner in sequence; 2) Use a non-porous membrane to completely wrap and securely fix the lining plate; 3) Place and fix the bonding corner fixture with fixing holes in the designated position, lift the liner with the bonding corner structure fabric layer, and place it in the same position as the bonding corner fixture. At the same time, set a breathable membrane between the liner and the bonding corner fabric layer so that the two vacuum systems are independent yet connected. 4) Use yarn to pass through the lining and the corresponding sewing and fixing holes of the bonding corner fixture to fix the lining to the bonding corner fixture; 5) Overlap the guide net in the cavity with the guide net in the bonding corner area, seal and wrap with a vacuum film, evacuate to the qualified vacuum pressure drop, then perform vacuum infusion and heat curing; 6) After curing, remove the vacuum auxiliary material, cut the yarn, remove the liner, and check the molding quality.

[0018] Furthermore, when the prepared liner and the suspended bonding corner are poured separately, the liner and the bonding corner tooling are connected by positioning pins and quick clamps through the quick mold change interface, so as to realize the rapid switching of the liner between different molds.

[0019] Furthermore, the cavity guide mesh overlaps with the bonding corner guide mesh by 10~20mm, a sealing strip is applied and a vacuum film is wrapped, two layers of vacuum are wrapped, and the vacuum pressure drop value is tested. After passing the test, vacuum infusion is performed and then heated for curing.

[0020] Furthermore, the yarn is made of alkali-free / aramid fiber material with a breaking strength ≥3000MPa and a stitching spacing of 50~80mm, forming a mesh-like fixing system.

[0021] Furthermore, the suture holes on the liner used for fixing with the adhesive corner fixture have a diameter of φ3~8mm, a hole spacing of 30~100mm, and a hole edge distance of 10mm.

[0022] The beneficial effects of this invention are as follows: 1. This invention presents a novel process and method for achieving large-size overhanging trailing edge bonding angles without adjusting the layup state or using adhesive spraying. This method has the advantages of strong designability, simple operation, reliable effect, and excellent quality. It can greatly improve the efficiency and quality performance of wind turbine blade trailing edge bonding angles, eliminate problems such as reduced interfacial bonding strength and affected layup effect caused by excessive adhesive spraying when large blades are suspended without trailing edge bonding angles, and improve the blade forming quality. Its application in wind turbine blades has broad application prospects.

[0023] 2. The molding process of this invention is simpler, the quality is more stable and reliable, the cost is low, the production efficiency is high, and the manufacturability is high. Due to the use of relevant technologies, the operation time for multiple rework adjustments is reduced, the problem of decreased interface strength caused by excessive use of spray adhesive is eliminated, the technical difficulty of high-quality molding of large blade bonding angles is reduced, the product molding cycle is shortened, and the technical route for blade molding is optimized. The manufacturing method is more flexible and efficient, the molding quality is more stable and reliable, the use of manual labor is reduced, and the technical complexity is lowered, making it highly valuable and economically feasible. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a specially designed liner connection structure for a wrinkle-free molding method of the trailing edge bonding angle of a wind turbine blade, provided in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. Adhesive corner fixture; 2. Adhesive corner structural fabric layer; 3. Liner; 4. Main mold. Detailed Implementation

[0028] 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.

[0029] like Figure 1 As shown, this embodiment provides a wrinkle-free forming method for the trailing edge bonding angle of a wind turbine blade, including: Using parametric modeling, a dynamic compensation coefficient K (K=1.05-1.12, automatically adjusted according to blade length and surface curvature) is introduced into the offset thickness calculation outside the theoretical bonding angle model to form a precise thickness formula of "theoretical layer thickness × number of layers + mold pre-deformation amount × K + 2mm". Through five-axis linkage machining in a machining center, a 0.3mm deep guide groove pre-forming trajectory is engraved on the surface of the substitute wood model, i.e. the bonding angle model, to provide a precise mold reference for the subsequent liner 3 glue injection groove, so that the conformity between the glue injection groove and the surface streamline is improved to more than 98%.

[0030] Within a 200±10mm area around the bonding angle model, apply fiberglass tape or double-sided adhesive to the surface of this area at 30mm intervals, and then apply 2-3 layers of BX800 biaxial fabric. When laying the biaxial fabric, use a 45° diagonal layering method, with each layer's warp and weft directions forming a 45° angle with the principal stress direction of the bonding angle. This increases the bending strength of the liner plate 3 by 30%, effectively supporting the suspended weight (approximately 25-35kg) of the bonding angle at the trailing edge of a 100m-class blade.

[0031] A porous membrane and a flow guide net are sequentially covered on top of the biaxial fabric. The flow guide net is 50 mm from the edge of the fabric layer, and the porous membrane is 30 mm from the edge of the fabric layer. The positioning tolerance is ±10 mm. An injection tube is placed in the center of the flow guide net, 50 mm from the edge of the flow guide net.

[0032] The surrounding area is sealed under vacuum and connected to the injection port for vacuum injection and curing of the fabric layer.

[0033] Remove the vacuum and auxiliary materials, and use a cutting machine or scissors to trim the edges of the liner blank 3 with the flow channel tube.

[0034] Use a drill bit to drill holes on the surface of the liner plate 3. The hole diameter is φ3~8mm, the hole spacing is 30~100mm, and the hole edge distance is 10mm.

[0035] The rear edge bonding corner is formed by casting the prepared liner 3 together with the suspended bonding corner or casting them separately.

[0036] Preferably, the process of jointly injecting the prepared liner 3 and the suspended bonding angle is as follows: 1) Place the adhesive corner liner 3 according to the specified connection position. After cleaning the surface, attach double-sided tape, flow guide mesh, porous membrane, release cloth and adhesive corner structure cloth layer 2 to its surface in sequence.

[0037] 2) Place the adhesive corner fixture 1 with fixing holes in the designated position and fix it securely with clamps or other materials. Lift the lining plate 3 with the adhesive corner structure fabric layer laid on it and lay it in the same position as the adhesive corner fixture 1. Do not use glue throughout the process. At the same time, use yarn to pass through the corresponding sewing and fixing holes of the lining plate 3 and the adhesive corner fixture 1 to fix the lining plate 3 to the adhesive corner fixture 1.

[0038] Specifically, using a crochet hook and yarn, the yarn is inserted through the holes punched in the lining plate 3 and exited through the holes punched in the adhesive corner fixture 1. The entire structure is fixed with yarn. The yarn is made of alkali-free / aramid fiber with a breaking strength ≥3000MPa. The stitching spacing is controlled at 50~80mm to form a grid-like fixing system. According to mechanical testing, the fabric layer fixing force reaches 15N / cm², completely replacing the 6~8N / cm² fixing effect of traditional spray glue.

[0039] 3) The inner cavity guide mesh overlaps with the adhesive corner guide mesh by 10~20mm, seal with adhesive strips, and wrap with a vacuum film. Wrap with two layers of vacuum, and check the vacuum pressure drop value. After passing the test, perform vacuum infusion and heat curing.

[0040] 4) After curing is qualified, remove the surface auxiliary material, cut the yarn, remove the lining plate 3, and check the surface repair quality. Record the corresponding results after passing the inspection.

[0041] Preferably, the process of separately grouting the prepared liner 3 and the suspended bonding angle is as follows: 1) Place the corner bonding plate 3 and corner bonding fixture 1 in the designated connection position. After cleaning the surface, attach double-sided tape, corner bonding structure cloth layer 2, release cloth, porous membrane and flow guide mesh to the surface of corner bonding fixture 1 in sequence.

[0042] 2) Use a non-porous membrane to completely wrap and securely fix the liner 3.

[0043] 3) Place the bonding corner fixture 1 with fixing holes in the designated position and fix it securely with clamps or other materials. Lift the inner liner 3 with the bonding corner structure fabric layer 2 laid on it and place it in line with the bonding corner fixture 1. No glue is used throughout the process. A 0.5mm thick breathable membrane is set between the liner 3 and the bonding corner fabric layer to make the two vacuum systems independent yet connected. When the vacuum degree is maintained at -0.095MPa, the resin filling time is shortened from 12 minutes in the traditional process to 8 minutes, and the resin flow front speed difference is ≤10%.

[0044] Among them, a quick mold change interface is designed. The liner 3 is connected to the tooling through a positioning pin (positioning accuracy ±0.5mm) and a quick clamp (clamping force 50~80N), which realizes the quick switching of the liner 3 between different molds, reducing the mold change time from 4 hours to 1.5 hours.

[0045] 4) Using a crochet hook and yarn, thread the yarn and the punched holes in the corner adhesive tool 1 through the yarn. Fix the whole structure with yarn. The yarn is made of alkali-free / aramid fiber with a breaking strength ≥3000MPa. The stitching spacing is controlled at 50~80mm to form a grid-like fixing system. According to mechanical testing, the fabric layer fixing force reaches 15N / cm², which completely replaces the fixing effect of traditional spray adhesive of 6~8N / cm².

[0046] 5) The cavity guide mesh overlaps with the adhesive corner guide mesh by 10~20mm, seal with adhesive strips and wrap with vacuum film, wrap with two layers of vacuum, and test the vacuum pressure drop value. After passing the test, vacuum injection and heat curing are performed.

[0047] 6) After curing is qualified, remove the surface auxiliary material, cut the yarn, remove the lining plate 3, and check the surface repair quality. Record the corresponding results after passing the inspection.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A wrinkle-free forming method for the trailing edge bonding angle of a wind turbine blade, characterized in that, include: The liner is prepared such that the liner profile is matched with the theoretical model of the bonding angle of the trailing edge of the wind turbine blade by an external offset thickness, which is calculated by a thickness formula. Carve the pre-formed trajectory of the flow channel on the surface of the substitute wood model, and at the same time apply fiberglass tape or double-sided tape to the surface of the surrounding area of ​​the substitute wood model, and apply biaxial cloth to the whole. A porous membrane and a flow guide net are sequentially covered on top of the biaxial fabric, and an injection tube is placed in the center of the flow guide net. The surrounding area is sealed under vacuum, and an injection port is connected. The fabric layer is vacuum-injected and cured to obtain a liner blank with an injection tube. Remove the vacuum and auxiliary materials, and preliminarily obtain the blank of the liner with the glue injection tube. Trim the edges and drill holes on its surface as stitching fixing holes for fixing with the adhesive corner tooling. The trailing edge bonding corner is formed by casting the prepared liner and the suspended bonding corner together or separately.

2. The wrinkle-free forming method for the trailing edge bonding angle of wind turbine blades as described in claim 1, characterized in that, The thickness formula is as follows: Outer offset thickness = Theoretical fabric thickness × Number of layers + Die pre-deformation × K + 2mm Wherein, K=1.05-1.12, which is automatically adjusted according to the blade length and surface curvature.

3. The wrinkle-free forming method for the trailing edge bonding angle of wind turbine blades as described in claim 1, characterized in that, When laying biaxial fabric, a 45° diagonal layering method is adopted, with the warp and weft directions of each layer of fabric forming a 45° angle with the direction of the principal stress of the bonding angle.

4. The wrinkle-free forming method for the trailing edge bonding angle of wind turbine blades as described in claim 1, characterized in that, When preparing the liner, the flow guide net is 50mm from the edge of the fabric layer, the porous membrane is 30mm from the edge of the fabric layer, and the positioning tolerance is ±10mm; the glue injection tube is 50mm from the edge of the flow guide net.

5. The wrinkle-free forming method for the trailing edge bonding angle of wind turbine blades as described in claim 1, characterized in that, The prepared liner and the suspended bonding corner are jointly injected, including: 1) Place the prepared liner at the designated connection position, and then attach double-sided tape, flow guide mesh, porous membrane, release cloth and adhesive corner structure cloth layer to the surface of the liner in sequence; 2) Place and fix the adhesive corner fixture with fixing holes in the designated position, lift the liner with the adhesive corner fabric layer, and place it in the same position as the adhesive corner fixture. At the same time, use yarn to pass through the liner and the corresponding sewing fixing holes of the adhesive corner fixture to fix the liner to the adhesive corner fixture. 3) Overlap the guide net in the cavity with the guide net in the bonding corner area, seal and wrap with a vacuum film, evacuate to the qualified vacuum pressure drop, then perform vacuum infusion and heat curing; 4) After curing, remove the vacuum auxiliary material, cut the yarn, remove the liner, and check the molding quality.

6. The wrinkle-free forming method for the trailing edge bonding angle of wind turbine blades as described in claim 1, characterized in that, The process of separately grouting the prepared liner and the suspended bonding corner includes: 1) Place the prepared liner at the designated connection position, and then attach double-sided tape, flow guide mesh, porous membrane, release cloth and adhesive corner structure cloth layer to the surface of the liner in sequence; 2) Use a non-porous membrane to completely wrap and securely fix the lining plate; 3) Place and fix the bonding corner fixture with fixing holes in the designated position, lift the liner with the bonding corner structure fabric layer, and place it in the same position as the bonding corner fixture. At the same time, set a breathable membrane between the liner and the bonding corner fabric layer so that the two vacuum systems are independent yet connected. 4) Use yarn to pass through the lining and the corresponding sewing and fixing holes of the bonding corner fixture to fix the lining to the bonding corner fixture; 5) Overlap the guide net in the cavity with the guide net in the bonding corner area, seal and wrap with a vacuum film, evacuate to the qualified vacuum pressure drop, then perform vacuum infusion and heat curing; 6) After curing, remove the vacuum auxiliary material, cut the yarn, remove the liner, and check the molding quality.

7. The wrinkle-free forming method for the trailing edge bonding angle of wind turbine blades as described in claim 6, characterized in that, When the prepared liner and the suspended bonding corner are poured separately, the liner and the bonding corner fixture are connected by positioning pins and quick clamps through the quick mold change interface, so as to realize the quick switching of the liner between different molds.

8. The wrinkle-free forming method for the trailing edge bonding angle of wind turbine blades as described in claim 1 or 2, characterized in that, The cavity guide mesh overlaps with the adhesive corner guide mesh by 10~20mm, a sealing strip is applied and a vacuum film is wrapped, two layers of vacuum are wrapped, and the vacuum pressure drop value is tested. After passing the test, vacuum injection is performed and then heated to cure.

9. The wrinkle-free forming method for the trailing edge bonding angle of a wind turbine blade as described in claim 1 or 2, characterized in that, The yarn is made of alkali-free / aramid fiber with a breaking strength ≥3000MPa and a stitching spacing of 50~80mm, forming a mesh-like fixing system.

10. The wrinkle-free forming method for the trailing edge bonding angle of a wind turbine blade as described in claim 1 or 2, characterized in that, The suture holes on the liner, used for fixing to the adhesive corner fixture, have a diameter of φ3~8mm, a hole spacing of 30~100mm, and a hole edge distance of 10mm.

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