Multi-sequence UD molding method for wind turbine blade

Abstract

The present invention provides a multi-sequence UD molding method for a wind turbine blade, comprising the following steps: S1, preparing a UD mold: cleaning a surface of the UD mold, and applying a mold release agent to an inner surface of the UD mold; S2, sequentially laying a first continuous mat and a first release fabric on the UD mold; S3, laying a first sequence of UD plies; S4, preparing a silicone mold; S5, laying a second sequence of UD plies; S6, connecting the silicone mold to the first sequence of UD plies and the second sequence of UD plies; and S7, applying and holding a vacuum, and resin infusion and curing. In the present invention, using a silicone mold and then positioning the silicone mold after laying a first sequence of UD plies allows for a multi-sequence UD layup to be molded in a single resin infusion, and for better aligned side edges between a first sequence of UD plies and a second sequence of UD plies, thereby improving the fit between multi-sequence UD layup and shell / core materials during molding, and improving shell molding efficiency and quality.

Description

A method for multi-sequence UD forming of wind turbine blades Technical Field

[0001] This invention relates to the field of non-metallic composite material processing and molding technology, and more specifically, to a multi-sequence UD molding method for wind turbine blades. Background Technology

[0002] As a key component of wind turbine generators, the design and performance of wind turbine blades directly affect the wind capture capability and power generation efficiency of the generator. Blades capture wind energy and convert it into mechanical energy, which then drives the generator to produce electricity. In the blade structure, the trailing edge UD plays a crucial role, primarily in improving the blade's structural strength and stiffness, thereby enhancing the stability and reliability of the entire generator unit and ensuring its safe operation under complex and changing environmental conditions.

[0003] Trailing edge UD positioning, i.e., the unidirectional arrangement and location of the blade's trailing edge, has a significant impact on the buckling stability of wind turbine blades. Buckling stability is an important indicator for evaluating the blade structure's resistance to deformation, and it is particularly important for structures like wind turbine blades that bear enormous wind loads. With the increasing size of wind turbine units, more and more ultra-large blade profiles are adopting multi-sequence UD structures to meet the trailing edge buckling strength requirements. Some UDs use a staggered structure, while others use a non-staggered block structure.

[0004] Currently, multi-sequence UD molding generally employs a staged injection method. This results in long molding cycles, waste of auxiliary materials and resin, and a lack of effective solutions to ensure a smooth leading edge. After vacuum tightening, the leading edge of the UD will have an arc shape. After demolding, this area cannot be well matched with the shell core material. Usually, it is necessary to fill the arc area with yarn, pad with cloth, or add a backing plate. This not only affects the efficiency of on-site operations, but also, if not handled properly, can cause wrinkles in the upper fabric layer, affecting the buckling stability of the trailing edge of the blade. Summary of the Invention

[0005] In view of this, the present invention aims to propose a multi-sequence UD molding method for wind turbine blades. This addresses the problems of long cycle times, uneven sides, and inability to quickly match the core material of the multi-sequence UD injection molding process in existing wind turbine blade technologies.

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

[0007] A method for multi-sequence UD forming of wind turbine blades includes the following steps:

[0008] S1. UD mold preparation: Clean the surface of the UD mold and apply a release agent to the inner surface of the UD mold;

[0009] S2. Lay the first continuous felt and the first release cloth sequentially on the UD mold;

[0010] S3, a sequence of UD layers laid;

[0011] S4. Silicone mold preparation: Position the silicone mold according to the first and second UD fabric layers.

[0012] S5, two-sequence UD layer laying;

[0013] S6. Connect the silicone mold to the first and second UD fabric layers;

[0014] S7. Vacuum establishment, pressure holding, and pouring curing.

[0015] This invention utilizes a silicone mold and positions the silicone mold after the first sequence of UD fabric layers are laid, and fixes the silicone mold during the laying of the second sequence of UD fabric layers. This not only enables the one-time injection molding of multiple UD sequences, but also makes the sides between the first and second sequence UD sequences smoother, thereby improving the compatibility between the multiple sequence UD sequences and the shell core material molding, and improving the shell molding efficiency and quality.

[0016] Furthermore, step S6 specifically includes the following steps:

[0017] S61. Remove the silicone mold from a series of UD fabric layers;

[0018] S62. Lay out a second release fabric and a perforated isolation film. The perforated isolation film is laid on the second release fabric. The second release fabric covers a first sequence of UD fabric layers and a second sequence of UD fabric layers. The perforated isolation film extends from the first sequence of UD fabric layers to the second sequence of UD fabric layers.

[0019] S63. According to the positioning in step S4, place the second continuous felt, the silicone mold and the guide net. The guide net covers the first sequence of UD fabric layers and the second sequence of UD fabric layers. At the same time, the guide net is connected and fixed to the second continuous felt on the lower side of the silicone mold.

[0020] This setup provides additional support to the UD fabric layers by laying a second release fabric and a flow guide net, helping to maintain the flatness of the fabric layers during the pouring and curing process. The flow guide net extends from the first-series UD fabric layers to the second-series UD fabric layers, ensuring uniform distribution of resin during pouring and further reducing side unevenness. By precisely connecting the silicone mold to the second continuous felt and the flow guide net, precise control over the shape and size of the UD fabric layers is achieved, avoiding side unevenness problems caused by shape deviations.

[0021] Furthermore, in step S6, the cross-section of the silicone mold is quadrilateral, the cross-section of the first sequence of UD fabric layers is triangular, and the cross-section of the second sequence of UD fabric layers is quadrilateral.

[0022] Further, in step S4, the silicone mold includes a first surface, a second surface, a third surface, and a fourth surface connected in sequence, the angle between the first surface and the second surface is α2, and the UD mold includes a flange surface and a bottom surface, the angle between the flange surface and the bottom surface is α1, α1=α2.

[0023] This setting ensures the flatness of the front side of the second-series UD by setting a certain height for the silicone mold and the second-series UD fabric layer, guaranteeing that the top of the UD is flush with the silicone mold without any warping after injection. This achieves overall flatness of the sides of the multi-series UD, thereby improving the compatibility with the shell core material and increasing the shell molding efficiency and quality.

[0024] Furthermore, in step S4, when positioning the silicone mold, a second continuous felt is placed at the lower end of the silicone mold, and the second side is set on the second continuous felt.

[0025] This setup uses a silicone mold for precise positioning. On one hand, it ensures that each sequence of UD fabric layers is laid accurately, avoiding repeated adjustments and corrections due to positional deviations, thus shortening the molding cycle. On the other hand, when positioning the silicone mold, a second continuous felt is placed at the bottom of the silicone mold. This step provides additional support for the UD fabric layers, helping to maintain the flatness of the fabric layers during the pouring and curing process. Furthermore, the flexibility and elasticity of the silicone mold can adapt to the shrinkage and deformation of the UD fabric layers during the curing process, thereby reducing unevenness on the sides.

[0026] Furthermore, the obtuse angle formed by the surface where the second continuous felt is located and the surface where the third surface is located is α3, where α3 > 90°.

[0027] This design not only prevents the film from failing to adhere properly to the silicone mold during vacuuming and avoids the film bursting and leaking air, but also ensures a smoother side surface during multi-sequence UD molding while maintaining a strong connection to the silicone mold.

[0028] Furthermore, the width of the first continuous felt and the second continuous felt is 100~300mm.

[0029] Furthermore, the basis weight of the first and second continuous felts is 200~300 g / m². 2 .

[0030] Furthermore, the first sequence of UD fabric layers consists of 17 to 21 layers, and the second sequence of UD fabric layers consists of 43 to 47 layers.

[0031] Furthermore, in step S7, the vacuum degree during vacuum establishment is ≤ -0.095MPa, the pressure holding time is 5~15min, and the vacuum degree decrease is ≤ 0.002MPa.

[0032] Compared with existing technologies, the multi-sequence UD forming method for wind turbine blades described in this invention has the following advantages:

[0033] 1) By using a silicone mold and positioning the silicone mold after laying the first sequence of UD fabric layers, and fixing the silicone mold when laying the second sequence of UD fabric layers, the present invention not only realizes the one-time injection molding of multiple sequences of UD, but also makes the side edges between the first sequence of UD and the second sequence of UD more flat, thereby improving the matching between the multiple sequence of UD and the shell core material molding, and improving the shell molding efficiency and quality.

[0034] In this invention, the angles of the flange face and bottom face in the UD mold are the same as the angles of the first face and the second face, which ensures the flatness of the front side of the second-series UD. The height of the silicone mold and the height of the second-series UD fabric layer are set to a certain value to ensure that the top of the UD is flush with the silicone mold without any warping after injection, thereby achieving the overall flatness of the side of the multi-series UD, thereby improving the matching with the shell core material and improving the shell molding efficiency and quality.

[0035] 3) The obtuse angle formed by the second continuous felt surface and the third surface surface of the present invention is α3, where α3 > 90°. This setting not only avoids the bag film from not being able to stick to the silicone mold properly during vacuuming and the bag film from bursting and leaking air, but also makes the sides flatter during multi-sequence UD molding while ensuring the strong connection of the silicone mold. Attached Figure Description

[0036] Figure 1 is a cross-sectional view of the multi-sequence UD forming of the wind turbine blade of the present invention;

[0037] Figure 2 is a schematic diagram of the matching between the UD and the core material of the present invention.

[0038] 1-First extraction pipe, 2-Second release cloth, 3-UD mold, 31-Flange face, 32-Bottom face, 4-Second sequence UD cloth layer, 5-First sequence UD cloth layer, 6-First continuous felt, 7-Guide net, 8-Perforated isolation membrane, 9-Silicone mold, 91-First surface, 92-Second surface, 93-Third surface, 94-Fourth surface, 10-Second continuous felt, 11-Second extraction pipe, 12-Shell core material, 13-First release cloth. Detailed Implementation

[0039] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0040] A method for forming multi-series UD (unique element) blades for wind turbine blades, the method being used to form a first-series UD and a second-series UD, includes the following steps:

[0041] S1. UD mold preparation: Clean the surface of UD mold 3 and apply release agent to the inner surface of the mold;

[0042] Specifically, the UD mold 3 includes a flange surface 31 and a bottom surface 32, the angle between the flange surface and the bottom surface is α1, and the connection point between the flange surface and the bottom surface is point a.

[0043] S2. Lay the first continuous felt 6 and the first release cloth 13 sequentially on the UD mold; the first continuous felt is laid on the bottom surface 32.

[0044] Specifically, the distance from point a at the end of the first continuous felt closest to the flange face is 130~170mm; the width of the first continuous felt 6 is 250~300mm; the first continuous felt is laid on the PS or SS surface at R25-90m, that is, the length of the first continuous felt is 65m, where R25-90m is the dimension in the length direction, which is the direction perpendicular to the cross-sectional view in the figure.

[0045] More specifically, the two ends of the first continuous felt need to be thinned at R25m and R90m to prevent steps from forming that would cause wrinkles in the upper UD fabric layer.

[0046] More specifically, the first release cloth 13 is laid on top of the first continuous felt with a width of 750~850mm. The front edge of the first release cloth extends 40~60mm beyond the front edge of the molded product. The excess part of the rear edge of the first release cloth is turned over to the flange surface. The release cloth is required to be laid flat and without wrinkles.

[0047] S3, a sequence of UD layers 5 are laid;

[0048] Specifically, a series of UD fabric layers 5 consists of 17 to 21 layers with a width of 200 to 300 mm. The layers are laid according to the start and end positions, first layer positioning data, and staggered layer requirements as required by the process. The staggered layer width of the UD fabric layers is measured every 5 layers to ensure that the staggered layer width meets the process requirements. The cross-section of the series of UD fabric layers is an obtuse triangle structure.

[0049] S4. Silicone mold preparation: Position the mold according to the first-series UD fabric layer 5 and the second-series UD fabric layer 4. Since the blades are curved areas, a silicone mold is more suitable for conforming to their shape.

[0050] Specifically, the position of the silicone mold is set according to the width of the second-series UD fabric layer 4. The width of the second-series UD fabric layer is 200~300mm. Positioning lines are drawn at intervals of about 0.9~1.1m along the length direction from the flange surface, and the silicone mold is placed according to the position of the drawn lines.

[0051] Specifically, the cross-section of the silicone mold is quadrilateral.

[0052] More specifically, the silicone mold 9 includes a first surface 91, a second surface 92, a third surface 93, and a fourth surface 94 connected in sequence. The angle between the first surface 91 and the second surface 92 is α2, and α1=α2, to ensure that after the two-series UD fabric layers are laid, they completely adhere to the flange surface and the silicone mold, avoiding the problem of resin richness on the sides after vacuum injection.

[0053] Specifically, the height of the silicone mold is determined based on the thickness of the second-series UD fabric layer, that is, the height of the second-series UD fabric layer is the same as the height of the fourth side. Therefore, if the silicone mold is too high, the bag film will not adhere properly during vacuuming, and the corner area where the second-series UD fabric layer contacts the silicone mold is prone to the problem of fabric layer curling after vacuum injection. If the silicone mold is too low, the problem of the arc corner of the leading edge of the second-series UD fabric layer still exists during vacuuming.

[0054] Specifically, when positioning the silicone mold, a second continuous felt 10 is placed on the lower side of the silicone mold, and the second surface 92 is set on the second continuous felt 10. The rear edge of the second continuous felt 10 is aligned with the rear edge of the second surface, and the front edge of the second continuous felt extends 10-20mm beyond the connection between the first surface and the second surface to prevent a series of UD cloth layers at the lower end of the silicone mold from being blocked during injection.

[0055] Specifically, the obtuse angle formed by the second continuous felt surface and the third surface is α3, where α3 > 90°. This setting not only prevents the bag film from failing to adhere to the silicone mold during vacuuming and avoids the bag film bursting and leaking air, but also ensures the strong connection of the silicone mold and makes the sides smoother during multi-sequence UD molding.

[0056] Specifically, before positioning the silicone mold, pretreatment is required. The pretreatment involves wrapping the outer surface of the silicone mold with a non-porous release film, and then sealing it with transparent tape. The seal must be tight to prevent resin from entering the silicone mold during vacuum injection and reducing the service life of the silicone mold.

[0057] Preferably, the non-porous separator is made of polypropylene or polyethylene.

[0058] S5, two-sequence UD layer 4 layup;

[0059] Specifically, the second-series UD fabric layer 4 consists of 43 to 47 layers with a width of 200 to 300 mm and a fabric type of UDS-1250. According to the process requirements, the second-series UD fabric layer is laid between the flange face, the silicone mold, and the first-series UD fabric layer at the start and end positions. The fabric layer is required to adhere firmly to the flange face, the silicone mold, and the second-series UD fabric layer. Any gaps should be filled with yarn to avoid resin enrichment on the sides after vacuum injection.

[0060] Specifically, the basis weight of the first continuous felt and the second continuous felt is 200~300g / m³. 2 .

[0061] S6. Connect the silicone mold to the first and second sequences of UD fabric layers; S6 specifically includes the following steps:

[0062] S61. Remove the silicone mold from a series of UD fabric layers; at this time, the second continuous felt is also removed accordingly.

[0063] S62. Lay the second release fabric 2 and the perforated isolation film 8. The second release fabric is in contact with the first release fabric on the outside of the multi-sequence UD. The perforated isolation film is laid on the second release fabric. The second release fabric covers the first sequence UD fabric layer and the second sequence UD fabric layer, and extends to both ends of the first sequence UD fabric layer and the second sequence UD fabric layer. The perforated isolation film extends from the first sequence UD fabric layer to the second sequence UD fabric layer, and the distance from the rear edge of the perforated isolation film to the flange surface is A, where A is 80~150mm.

[0064] S63. According to the positioning in step S4, place the second continuous felt, the silicone mold, and the flow guide net 7. The silicone mold is placed on the second continuous felt, which is placed on a first sequence of UD fabric layers. The flow guide net covers the first and second sequences of UD fabric layers, and also covers the silicone mold. The flow guide net is connected and fixed to the second continuous felt on the lower side of the silicone mold. Specifically, the second surface of the silicone mold, the second continuous felt, the first surface of the silicone mold, and the perforated isolation membrane are all fixed together by spraying adhesive.

[0065] Specifically, the distance A between the rear edge of the guide net and the flange face is 80~150mm. The guide net extends from the upper end of a series of UD fabric layers to the fourth, third, and third surfaces of the silicone mold, and then to another series of UD fabric layers. The position and edge distance of the guide net from the PS and SS surfaces are shown in Table 1. Position refers to the length direction, and edge distance refers to the distance from the flange face.

[0066] Table 1

[0067]

[0068] Specifically, step S63 also includes laying a first suction pipe 1, a second suction pipe 11, a glue injection pipe (not shown in the figure), and a vacuum bag film (not shown in the figure); the first suction pipe and the second suction pipe are located on the two ends of the first release fabric and the second release fabric. The laying of the first suction pipe, the second suction pipe, the vacuum bag film, and the glue injection pipe are all existing technologies and will not be described in detail here.

[0069] S7. Vacuum Establishment, Pressure Holding, and Injection Curing. After all layers and auxiliary materials are laid, establish a vacuum system, requiring a vacuum degree ≤ -0.095MPa. After shutting off the vacuum system, maintain pressure for 7~12 minutes, requiring a vacuum degree drop ≤ 0.002MPa. The ambient temperature must be controlled between 15℃ and 35℃. After pressure holding, perform injection curing. First, cure at 45~55℃ for 1.5~2.5 hours, then cure at 75~85℃ for 3.5~4.5 hours. Within the low-temperature curing temperature and time range, allow the resin to pass through its exothermic peak to avoid wrinkles in the UD product caused by violent resin exothermics. Within the high-temperature curing temperature and time range, heat to ensure the product reaches the required Tg and hardness. After the product has cured, remove the surface auxiliary materials to obtain a multi-sequence UD product with smooth sides, improving UD molding efficiency and the compatibility between the UD and the shell core material 12, thereby improving shell molding efficiency and quality. Example 1

[0070] A method for molding multi-series UD (Underlying Device) blades for wind turbine blades employs an upper and lower flow guiding scheme to integrally cast multiple sequences of UD. During installation, a pre-purchased or manufactured silicone mold is used. After the first sequence of UD layers is laid, the silicone mold is positioned according to the width of the upper second sequence of UD Block layers. After the silicone mold is placed, the second sequence of UD layers is laid between the flange face and the silicone mold. After all UD layers are laid, the silicone mold is fixed, and then the entire process is cast together. The method includes the following steps:

[0071] Step 1: UD mold preparation: Clean the surface of the UD mold and apply a release agent to the mold surface according to the process requirements;

[0072] Specifically, the UD mold 3 includes a flange face and a bottom face, the angle between the flange face and the bottom face is α1, and the connection point between the flange face and the bottom face is point a.

[0073] Step 2: Lay the first continuous felt and the first release cloth sequentially on the UD mold; the first continuous felt is laid on the bottom surface.

[0074] Specifically, the distance from point a to the end of the first continuous felt near the flange face is 150mm; the width of the first continuous felt is 300mm; the first continuous felt is laid on the PS or SS surface at R25-90m, that is, the length of the first continuous felt is 65m, where R25-90m is the dimension in the length direction, which is the direction perpendicular to the cross-sectional view in the figure.

[0075] More specifically, the two ends of the first continuous felt need to be thinned at R25m and R90m to prevent steps from forming that would cause wrinkles in the upper UD fabric layer.

[0076] More specifically, the first release cloth is laid on top of the first continuous felt, with a width of 800mm. The front edge of the first release cloth extends 50mm beyond the front edge of the molded product, and the excess part of the rear edge of the first release cloth is turned up to the flange surface. The release cloth is required to be laid flat and without wrinkles.

[0077] Step 3: Lay out a series of UD layers;

[0078] Specifically, the first-series UD fabric has a total of 19 layers, a width of 250mm, and a weight of 300g / m². 2， The fabric type is UDS-1250, and the weight is 300g / m². 2 Laying is carried out according to the start and end positions, first layer positioning data, staggered layer requirements, etc. of the process requirements. The staggered layer width of UD fabric is measured every 5 layers to ensure that the staggered layer width meets the process requirements. The cross section of a series of UD fabric layers is an obtuse triangle structure.

[0079] Step 4: Silicone Mold Preparation: Position the blades according to the first and second UD fabric layers. Since the blades are curved areas, a silicone mold is more suitable for conforming to their shape.

[0080] Specifically, the position of the silicone mold is set according to the width of the fabric layer laid in the second-series UD. The width of the second-series UD fabric layer is 250mm. Positioning lines are drawn at intervals of about 0.9~1.1m along the length direction from the flange surface, and the silicone mold is placed according to the position of the drawn lines.

[0081] Specifically, the cross-section of the silicone mold is quadrilateral.

[0082] More specifically, the silicone mold includes a first surface, a second surface, a third surface, and a fourth surface connected in sequence. The angle between the first surface and the second surface is α2, α1=α2=100°, to ensure that after the two-series UD fabric layers are laid, they completely adhere to the flange surface and the silicone mold, avoiding the problem of resin richness on the sides after vacuum injection.

[0083] Specifically, the height of the silicone mold is determined based on the thickness of the second-series UD fabric layer, that is, the height of the second-series UD fabric layer is the same as the height of the fourth side. Therefore, if the silicone mold is too high, the bag film will not adhere properly during vacuuming, and the corner area where the second-series UD fabric layer contacts the silicone mold is prone to the problem of fabric layer curling after vacuum injection. If the silicone mold is too low, the problem of the arc corner of the leading edge of the second-series UD fabric layer still exists during vacuuming.

[0084] Specifically, when positioning the silicone mold, a second continuous felt is placed at the lower end of the silicone mold, and the second surface is set on the second continuous felt. The rear edge of the second continuous felt is aligned with the rear edge of the second surface, and the front edge of the second continuous felt extends 15mm beyond the connection between the first surface and the second surface to prevent a series of UD cloth layers at the lower end of the silicone mold from being blocked during injection.

[0085] Specifically, the obtuse angle formed by the surface of the second continuous felt and the surface of the third felt is α3, where α3 is 120°.

[0086] Specifically, before positioning the silicone mold, pretreatment is required. The pretreatment involves wrapping the outer surface of the silicone mold with a non-porous release film, and then sealing it with transparent tape. The seal must be tight to prevent resin from entering the silicone mold during vacuum injection and reducing the service life of the silicone mold.

[0087] Preferably, the non-porous separator is made of polypropylene or polyethylene.

[0088] Step 5: Lay out the second-sequence UD layer;

[0089] Specifically, the second-series UD fabric has a total of 45 layers, a width of 250mm, and a basis weight of 300g / m². 2 The fabric type is UDS-1250. According to the process requirements, the second sequence of UD fabric layers is laid between the flange face, the silicone mold, and the first sequence of UD fabric layers at the start and end positions. The fabric layers are required to adhere firmly to the flange face, the silicone mold, and the second sequence of UD fabric layers. Any gaps are filled with yarn to avoid resin enrichment on the sides after vacuum injection.

[0090] Step Six: Attach the silicone mold to the first and second UD fabric layers; Step Six specifically includes the following steps:

[0091] a. Remove the silicone mold from a series of UD fabric layers; at this time, the second continuous felt is also removed accordingly;

[0092] b. Lay a second release fabric and a perforated release membrane 8. The second release fabric is in contact with the first release fabric on the outside of the multi-sequence UD. The perforated release membrane 8 is laid on the second release fabric. The second release fabric covers the first-sequence UD fabric layer and the second-sequence UD fabric layer, and extends to both ends of the first-sequence UD fabric layer and the second-sequence UD fabric layer. The perforated release membrane extends from the first-sequence UD fabric layer to the second-sequence UD fabric layer, and the distance from the rear edge of the perforated release membrane to the flange surface is A, where A is 100mm.

[0093] c. According to the positioning in step four, place the second continuous felt, the silicone mold, and the flow guide net. The silicone mold is placed on the second continuous felt, and the second continuous felt is placed on the first sequence of UD fabric layers. The flow guide net covers the first sequence of UD fabric layers and the second sequence of UD fabric layers, and also covers the silicone mold. Connect and fix the flow guide net to the second continuous felt on the lower side of the silicone mold. Specifically, the second side of the silicone mold and the second continuous felt, the first side of the silicone mold and the perforated isolation membrane are all fixed together by spraying adhesive.

[0094] Specifically, the distance between the rear edge of the flow guide net and the flange surface is A, where A is 100mm. The flow guide net extends from the upper end of a series of UD fabric layers to the fourth, third, and a series of UD fabric layers of the silicone mold.

[0095] Specifically, step c also includes laying a first suction pipe 1, a second suction pipe 11, a glue injection pipe (not shown in the figure), and a vacuum bag film (not shown in the figure); wherein, the first suction pipe and the second suction pipe are located on the two ends of the first release fabric and the second release fabric, and the laying of the first suction pipe, the second suction pipe, the vacuum bag film, and the glue injection pipe are all existing technologies and will not be described in detail here.

[0096] Specifically, the sequence of UD fabric layers, the first release fabric, the second release fabric, the first continuous felt, and the second continuous felt are made of conventional materials, wherein the first release fabric and the second release fabric are nylon 6.

[0097] Step 7: Vacuum Establishment, Pressure Holding, and Injection Curing. After all layers and auxiliary materials are laid, establish a vacuum system with a vacuum degree ≤ -0.095MPa. After shutting off the vacuum system, maintain pressure for 10 minutes, requiring a vacuum degree drop ≤ 0.002MPa. The ambient temperature must be controlled at 25℃. After pressure holding, perform injection curing. The initial curing temperature is 50℃ for 2 hours, followed by a final curing temperature of 80℃ for 4 hours. After the product has cured, remove the surface auxiliary materials to obtain a multi-sequence UD product with flat sides. This improves UD molding efficiency and the compatibility between the UD and the shell core material, thereby improving shell molding efficiency and quality.

[0098] Specifically, the resin used for the infusion is Daosheng Tianhe 190 / 195 resin.

[0099] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A wind turbine blade multi-sequence UD forming method, characterized by, Includes the following steps: S1. UD mold preparation: Clean the surface of the UD mold and apply a release agent to the inner surface of the UD mold; S2. Lay the first continuous felt and the first release cloth sequentially on the UD mold; S3, a sequence of UD layers laid; S4. Silicone mold preparation: Position the silicone mold according to the first and second UD fabric layers. S5, two-sequence UD layer laying; S6. Connect the silicone mold to the first and second UD fabric layers; S7. Vacuum establishment, pressure holding, and pouring curing.

2. The method for multi-sequence UD forming of wind turbine blades according to claim 1, characterized in that... Therefore, step S6 specifically includes the following steps: S61. Remove the silicone mold from a series of UD fabric layers; S62. Lay out a second release fabric and a perforated isolation film. The perforated isolation film is laid on the second release fabric. The second release fabric covers a first sequence of UD fabric layers and a second sequence of UD fabric layers. The perforated isolation film extends from the first sequence of UD fabric layers to the second sequence of UD fabric layers. S63. According to the positioning in step S4, place the second continuous felt, the silicone mold and the guide net. The guide net covers the first sequence of UD fabric layers and the second sequence of UD fabric layers. At the same time, the guide net is connected and fixed to the second continuous felt on the lower side of the silicone mold.

3. A wind turbine blade multi-sequence UD forming method according to claim 1, characterized in that, In step S6, the cross-section of the silicone mold is quadrilateral, the cross-section of the first sequence of UD fabric layers is triangular, and the cross-section of the second sequence of UD fabric layers is quadrilateral.

4. A wind turbine blade multi-sequence UD forming method according to claim 1, characterized in that, In step S4, the silicone mold includes a first surface, a second surface, a third surface, and a fourth surface connected in sequence, with the angle between the first surface and the second surface being α2. The UD mold includes a flange surface and a bottom surface, with the angle between the flange surface and the bottom surface being α1, where α1 = α2.

5. A wind turbine blade multi-sequence UD forming method according to claim 4, characterized in that, In step S4, when positioning the silicone mold, a second continuous felt is placed at the lower end of the silicone mold, and the second side is set on the second continuous felt.

6. A wind turbine blade multi-sequence UD forming method according to claim 5, wherein, The obtuse angle formed by the surface of the second continuous felt and the surface of the third felt is α3, where α3 > 90°.

7. A wind turbine blade multi-sequence UD forming method according to claim 1, characterized in that, The width of the first continuous felt and the second continuous felt is 100~300mm.

8. A wind turbine blade multi-sequence UD forming method according to claim 1, characterized in that, The first continuous felt and the second continuous felt have a grammage of 200-300 g / m 2 .

9. A wind turbine blade multi-sequence UD forming method according to claim 1, characterized in that, The first sequence of UD fabric layers consists of 17 to 21 layers, and the second sequence of UD fabric layers consists of 43 to 47 layers.

10. A wind turbine blade multi-sequence UD forming method according to claim 1, characterized in that, In step S7, the vacuum level during vacuum establishment is ≤ -0.095MPa, the pressure holding time is 5~15min and the vacuum level decrease is ≤ 0.002MPa.

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