Wind power blade multi-sequence UD forming method

Abstract

The invention provides a wind power blade multi-sequence UD forming method which comprises the following steps: S1, UD mold preparation: cleaning the surface of a UD mold, and coating the inner surface of the UD mold with a release agent; s2, first continuous felt and first demolding cloth are sequentially laid on the UD mold; s3, laying a sequence of UD cloth layers; s4, preparing a silica gel mold; s5, laying a second-sequence UD cloth layer; s6, the silica gel mold is connected to the first-sequence UD cloth layer and the second-sequence UD cloth layer; and S7, vacuum building, pressure maintaining, pouring and curing are conducted. According to the method, the silica gel mold is used and the silica gel mold is positioned after the first-sequence UD cloth layer is laid, one-time pouring forming of the multiple-sequence UD can be achieved, the side edge between the first-sequence UD and the second-sequence UD is smoother, then the matching performance of the multiple-sequence UD and shell core material forming is improved, and the shell forming efficiency and quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of non-metal composite material processing and forming, and in particular to a multi-sequence UD forming method for a wind turbine blade. Background Art

[0002] As a key component of a wind turbine generator set, the design and performance of wind turbine blades directly affect the wind capture capacity and power generation efficiency of the wind turbine generator set. The blades capture wind energy and convert it into mechanical energy, which in turn drives the generator to generate electricity. In the structure of the blade, the trailing edge UD plays a vital role, mainly in improving the structural strength and stiffness of the blade, thereby improving the stability and reliability of the entire unit operation, ensuring its safe operation under complex and changing environmental conditions.

[0003] Trailing edge UD positioning, that is, the laying method and position of the unidirectional cloth on the trailing edge of the blade, has a significant impact on the buckling stability of wind turbine blades. Buckling stability is an important indicator for evaluating the ability of blade structures to resist deformation, and is particularly important for wind turbine blades, which are structures that bear huge wind loads. With the large-scale development of wind turbines, more and more super-large blades use multi-sequence UD structures to meet the requirements of trailing edge anti-buckling strength. Some UDs use staggered structures, and some UDs use non-staggered block structures.

[0004] At present, for multi-sequence UD molding, a multi-shot infusion solution is generally used, which results in a long molding cycle, waste of auxiliary consumables, resin, etc., and there is no good solution to ensure the flatness of the leading edge side. After vacuum tightening, the leading edge side of the UD will produce an arc shape. After demolding, this area cannot match the shell core material well. Usually, it is necessary to fill the arc area with yarn, pad cloth, add pads, etc., which affects the on-site operation efficiency on the one hand, and improper treatment will cause wrinkles in the upper cloth layer on the other hand, affecting the bending 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 to solve the problems in the prior art of long cycle of multi-sequence UD injection molding of wind turbine blades, uneven sides, and inability to quickly match with shell core materials.

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

[0007] A multi-sequence UD molding method for a wind turbine blade comprises the following steps:

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

[0009] S2, laying a first continuous felt and a first release cloth on the UD mold in sequence;

[0010] S3, laying of a sequence of UD fabric layers;

[0011] S4, silicone mold preparation: positioning the silicone mold according to the first sequence UD cloth layer and the second sequence UD cloth layer;

[0012] S5, laying of second sequence UD fabric layers;

[0013] S6, connecting the silicone mold to the first sequence UD fabric layer and the second sequence UD fabric layer;

[0014] S7, vacuum establishment, pressure maintenance, infusion and curing.

[0015] The present invention uses a silicone mold and positions the silicone mold after a first-sequence UD cloth layer is laid, and fixes the silicone mold when a second-sequence UD cloth layer is laid, so that not only one-time injection molding of multiple-sequence UD is achieved, but also the side edges between the first-sequence UD and the second-sequence UD are smoother, thereby improving the matching of the multiple-sequence UD and the shell core material molding, and improving the shell molding efficiency and quality.

[0016] Furthermore, in step S6, the following steps are specifically included:

[0017] S61, removing the silicone mold from a sequence of UD fabric layers;

[0018] S62, laying a second release cloth and a perforated isolation film, wherein the perforated isolation film is laid on the second release cloth, the second release cloth covers the first sequence UD cloth layer and the second sequence UD cloth layer, and the perforated isolation film extends from the first sequence UD cloth layer to the second sequence UD cloth layer;

[0019] S63, positioning according to step S4, placing the second continuous felt, the silicone mold and the guide net, the guide net covers the first sequence UD cloth layer and the second sequence UD cloth layer, and at the same time, the guide net is connected and fixed to the second continuous felt at the lower side of the silicone mold.

[0020] This setup provides additional support for the UD fabric layer by laying a second release cloth and a guide net, which helps to maintain the flatness of the fabric layer during the infusion and curing process. The guide net extends from the first sequence UD fabric layer to the second sequence UD fabric layer, ensuring the uniform distribution of the resin during the infusion process, further reducing the side unevenness phenomenon, and by accurately connecting the silicone mold to the second continuous felt and the guide net, the shape and size of the UD fabric layer can be precisely controlled, avoiding the side unevenness problem caused by shape deviation.

[0021] Further, in step S6, the cross section of the silicone mold is a quadrilateral, the laying cross section of the first sequence of UD fabric layers is a triangle, and the laying cross section of the second sequence of UD fabric layers is a 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, the UD mold includes a flange surface and a bottom surface, the angle between the flange surface and the bottom surface is α1, and α1=α2.

[0023] This setting ensures the flatness of the front end side of the second-sequence UD, sets the height of the silicone mold and the height of the second-sequence UD cloth layer to a certain level, ensures that the top of the UD is flush with the silicone mold without warping after pouring, thereby achieving the overall flatness of the multi-sequence UD side, thereby improving the matching with the shell core material and improving the shell molding efficiency and quality.

[0024] Further, in step S4, when the silicone mold is positioned, a second continuous felt is placed on the lower end of the silicone mold, and the second surface is arranged on the second continuous felt.

[0025] This setting is precisely positioned through the silicone mold. On the one hand, it ensures that each sequence of UD cloth layers is laid accurately, avoiding repeated adjustments and corrections due to position deviations, thereby shortening the molding cycle. On the other hand, when the silicone mold is positioned, a second continuous felt is placed at the lower end of the silicone mold. This step provides additional support for the UD cloth layer, which helps to maintain the flatness of the cloth layer during the infusion and curing process. The flexibility and elasticity of the silicone mold can adapt to the shrinkage and deformation of the UD cloth layer during the curing process, thereby reducing the unevenness of the side edges.

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

[0027] This setting not only prevents the bag film from failing to stick to the silicone mold during vacuuming, and prevents the bag film from bursting and leaking, but also ensures the firmness of the silicone mold connection, making the side smoother during multi-sequence UD molding.

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

[0029] Furthermore, the first continuous felt and the second continuous felt have a gram weight of 200 to 300 g / m 2 .

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

[0031] Furthermore, in step S7, the vacuum degree during vacuum establishment is ≤-0.095 MPa, the pressure holding time is 5 to 15 minutes, and the vacuum degree decreases by ≤0.002 MPa.

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

[0033] 1) The present invention uses a silicone mold and positions the silicone mold after laying a first-sequence UD cloth layer, and fixes the silicone mold when laying a second-sequence UD cloth layer, so that not only multiple-sequence UD can be cast in one shot, but also the side between the first-sequence UD and the second-sequence UD is smoother, thereby improving the matching of the multiple-sequence UD and the shell core material molding, and improving the shell molding efficiency and quality;

[0034] 2) The angles of the flange surface and the bottom surface in the UD mold of the present invention are the same as the angles of the first surface and the second surface, so that the flatness of the front side of the second sequence UD is achieved. The height of the silicone mold and the height of the second sequence UD cloth layer are set to a certain level to ensure that the top of the UD is flush with the silicone mold without warping after pouring, thereby achieving the overall flatness of the side of the multi-sequence 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 surface where the second continuous felt is located and the surface where the third surface is located is α3, α3>90°. This setting not only avoids the bag film from failing to stick to the silicone mold during vacuuming and the bag film from bursting and leaking, but also ensures the firmness of the connection of the silicone mold and makes the side smoother during multi-sequence UD molding. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0038] 1-first exhaust pipe, 2-second demoulding cloth, 3-UD mold, 31-flange surface, 32-bottom surface, 4-second sequence UD cloth layer, 5-first sequence UD cloth layer, 6-first continuous felt, 7-flow 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 exhaust pipe, 12-shell core material, 13-first demoulding cloth. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0040] A multi-sequence UD forming method for a wind turbine blade, the forming method is used to form a first-sequence UD and a second-sequence UD, comprising the following steps:

[0041] S1. UD mold preparation: clean the surface of the UD mold 3 and apply a release agent on the inner surface of the mold;

[0042] Specifically, the UD mold 3 includes a flange surface 31 and a bottom surface 32 . The angle formed by 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, laying a first continuous felt 6 and a first release cloth 13 in sequence on the UD mold; the first continuous felt is laid on the bottom surface 32 .

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

[0045] More specifically, both ends of the first continuous felt need to be thinned at R25m and R90m to prevent steps from being generated and causing wrinkles in the upper UD fabric layer.

[0046] More specifically, the first release cloth 13 is laid above the first continuous felt with a width of 750-850 mm, the leading edge of the first release cloth exceeds the leading edge of the molded product by 40-60 mm, and the excess portion of the trailing edge of the first release cloth is turned over to the flange surface. The release cloth is required to be laid flat without wrinkles.

[0047] S3, laying of a sequence of UD fabric layers 5;

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

[0049] S4, silicone mold preparation: positioning according to the first sequence UD cloth layer 5 and the second sequence UD cloth layer 4. Since the blades are all curved areas, the silicone mold is more suitable for the shape.

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

[0051] Specifically, the cross section of the silicone mold is a 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 which are connected in sequence. The angle between the first surface 91 and the second surface 92 is α2, and α1=α2, so as to ensure that after the second sequence UD cloth layer is laid, the flange surface and the silicone mold are completely adhered to avoid the problem of resin-rich side after vacuum infusion.

[0053] Specifically, the height of the silicone mold is determined according to the thickness of the second-sequence UD fabric layer, that is, the height of the second-sequence UD fabric layer is consistent with the height of the fourth surface. Therefore, if the silicone mold is too high, the bag film will not be firmly attached to the corner area where the second-sequence UD fabric layer contacts the silicone mold during vacuuming, and the fabric layer may easily warp after vacuum infusion. If the silicone mold is too low, the arc angle problem on the leading edge of the second-sequence UD fabric layer still exists during vacuuming.

[0054] Specifically, when the silicone mold is positioned, a second continuous felt 10 is placed on the lower side of the silicone mold, and the second surface 92 is arranged 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 leading edge of the second continuous felt extends beyond the connection between the first surface and the second surface by 10-20 mm to prevent a sequence of UD cloth layers at the lower end of the silicone mold from being wrapped during pouring.

[0055] Specifically, 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, α3>90°. This setting not only avoids the bag film from failing to stick to the silicone mold during vacuuming and the bag film from bursting and leaking, but also ensures the firmness of the connection of the silicone mold while making the side smoother during multi-sequence UD molding.

[0056] Specifically, the silicone mold needs to be pre-treated before positioning. The pre-treatment is to wrap a layer of non-porous isolation film on the outer surface of the silicone mold, and then use transparent tape to seal it. The seal must be tight to prevent resin from entering the silicone mold during vacuum infusion and reducing the service life of the silicone mold.

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

[0058] S5, laying of second sequence UD fabric layer 4;

[0059] Specifically, the second-sequence UD cloth layer 4 has a total of 43 to 47 layers, a width of 200 to 300 mm, and a fabric type of UDS-1250. The second-sequence UD cloth layer is laid between the flange surface, the silicone mold, and the first-sequence UD cloth layer at the starting and ending positions according to the process requirements. The cloth layer is required to be close to the flange surface, the silicone mold, and the second-sequence UD cloth layer, and the gap area is filled with yarn to avoid resin-rich sides after vacuum infusion.

[0060] Specifically, the first continuous felt and the second continuous felt have a gram weight of 200 to 300 g / m 2 .

[0061] S6, connecting the silicone mold to the first sequence UD fabric layer and the second sequence UD fabric layer; S6 specifically includes the following steps:

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

[0063] S62. Lay the second release cloth 2 and the perforated isolation membrane 8. The second release cloth contacts the first release cloth at the outer side of the multi-sequence UD. The perforated isolation membrane is laid on the second release cloth. The second release cloth covers the first-sequence UD cloth layer and the second-sequence UD cloth layer and extends to both ends of the first-sequence UD cloth layer and the second-sequence UD cloth layer. The perforated isolation membrane extends from the first-sequence UD cloth layer to the second-sequence UD cloth layer. The distance between the rear edge of the perforated isolation membrane and the flange surface is A, and the value of A is 80-150 mm.

[0064] S63, according to the positioning of step S4, place the second continuous felt, the silicone mold and the guide net 7, the silicone mold is placed on the second continuous felt, the second continuous felt is placed on the first sequence of UD cloth layers, the guide net covers the first sequence of UD cloth layers and the second sequence of UD cloth layers, and also covers the silicone mold, and the guide net is connected and fixed 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 film are fixed together by spraying glue.

[0065] Specifically, the distance between the trailing edge of the guide net and the flange surface is A, and the value of A is 80-150 mm. The guide net extends from the upper end of a sequence of UD cloth layers to the fourth surface, the third surface, and a sequence of UD cloth layers of the silicone mold. The position and distance from the edge of the guide net to the PS surface and the SS surface are shown in Table 1, where the position refers to the length direction and the distance from the edge refers to the distance from the flange surface.

[0066] Table 1

[0067]

[0068] Specifically, step S63 also includes laying a first exhaust pipe 1, a second exhaust pipe 11, a glue injection pipe (not shown in the figure), and a vacuum bag film (not shown in the figure); the first exhaust pipe and the second exhaust pipe are located on the two ends of the first release cloth and the second release cloth. The laying of the first exhaust pipe, the second exhaust 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 maintenance, infusion and curing. After all fabric layers and auxiliary materials are laid, a vacuum system is established, requiring the vacuum degree ≤-0.095MPa, and after closing the exhaust system, the pressure is maintained for 7 to 12 minutes, and the vacuum degree is required to drop by ≤0.002MPa. The ambient temperature needs to be controlled between 15℃-35℃, and infusion and curing are carried out after pressure maintenance. First, the curing temperature is heated at 45 to 55℃ for 1.5 to 2.5h, and then the curing temperature is heated at 75 to 85℃ for 3.5 to 4.5h. Within the low-temperature curing temperature and time range, the resin is allowed to pass the exothermic peak to avoid the resin from releasing heat violently and causing wrinkles in the UD product. Heat within the high-temperature curing temperature and time range to make the product meet the Tg and hardness requirements. After the product is cured, remove the surface auxiliary materials to obtain a multi-sequence UD product with smooth sides, improve the UD molding efficiency and the matching of UD and the shell core material 12, thereby improving the shell molding efficiency and quality.

[0070] Example 1

[0071] A multi-sequence UD molding method for a wind turbine blade adopts an upper and lower diversion scheme to integrally cast the multi-sequence UD. During the laying process, a silicone mold purchased or manufactured in advance is used. After the first sequence UD cloth layer is laid, the silicone mold is positioned and placed according to the width of the second sequence UD Block cloth layer above. After the silicone mold is placed, the second sequence UD cloth layer is continued to be laid between the flange surface and the silicone mold. After all the UD cloth layers are laid, the silicone mold is fixed, and then cast together. Specifically, the following steps are included:

[0072] Step 1: UD mold preparation: clean the surface of the UD mold and apply a release agent on the mold surface according to the process requirements;

[0073] Specifically, the UD mold 3 includes a flange surface and a bottom surface. The angle formed by the flange surface and the bottom surface is α1, and the connection point between the flange surface and the bottom surface is point a.

[0074] Step 2: Lay a first continuous felt and a first demoulding cloth on the UD mold in sequence; the first continuous felt is laid on the bottom surface.

[0075] Specifically, the distance between one end of the first continuous felt close to the flange surface and point a is 150 mm; the width of the first continuous felt is 300 mm; the first continuous felt is laid on the PS surface or SS surface at R25-90m, that is, the length of the first continuous felt is 65m, R25-90m is the dimension in the length direction, and the length direction is the direction perpendicular to the cross-sectional view in the figure.

[0076] More specifically, both ends of the first continuous felt need to be thinned at R25m and R90m to prevent steps from being generated and causing wrinkles in the upper UD fabric layer.

[0077] More specifically, the first release cloth is laid on top of the first continuous felt with a width of 800 mm. The leading edge of the first release cloth exceeds the leading edge of the formed product by 50 mm, and the excess portion of the trailing edge of the first release cloth is turned over to the flange surface. The release cloth is required to be laid flat without wrinkles.

[0078] Step 3: Laying down a sequence of UD fabric layers;

[0079] Specifically, a sequence of UD fabric layers totals 19 layers, with a width of 250mm and a gram weight of 300g / m 2， Fabric type is UDS-1250, weight is 300g / m 2 ; Lay according to the starting and ending positions, first layer positioning data, staggered layer requirements, etc. of the process requirements, measure the staggered layer width of the UD cloth layer every 5 layers to ensure that the staggered layer width meets the process requirements. The cross-section of a sequence of UD cloth layers forms an obtuse triangle structure.

[0080] Step 4: Silicone mold preparation: Position according to the first and second UD fabric layers. Since the blades are all curved areas, it is more convenient to choose a silicone mold.

[0081] Specifically, the position of the silicone mold is set according to the width of the second-sequence UD cloth layer. The width of the second-sequence UD cloth layer is 250 mm. Positioning lines are drawn at intervals of about 0.9 to 1.1 m from the flange surface in the length direction, and the silicone mold is placed according to the drawn line position.

[0082] Specifically, the cross section of the silicone mold is a quadrilateral.

[0083] More specifically, the silicone mold includes a first surface, a second surface, a third surface, and a fourth surface which are connected in sequence. The angle between the first surface and the second surface is α2, and α1=α2=100°, so as to ensure that after the second sequence UD cloth layer is laid, the flange surface and the silicone mold are completely adhered to avoid the problem of resin-rich side after vacuum infusion.

[0084] Specifically, the height of the silicone mold is determined according to the thickness of the second-sequence UD fabric layer, that is, the height of the second-sequence UD fabric layer is consistent with the height of the fourth surface. Therefore, if the silicone mold is too high, the bag film will not be firmly attached to the corner area where the second-sequence UD fabric layer contacts the silicone mold during vacuuming, and the fabric layer may easily warp after vacuum infusion. If the silicone mold is too low, the arc angle problem of the side edge of the front edge of the second-sequence UD fabric layer still exists during vacuuming.

[0085] Specifically, when the silicone mold is positioned, a second continuous felt is placed at the lower end of the silicone mold, 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 leading edge of the second continuous felt exceeds the connection between the first surface and the second surface by 15 mm to prevent a sequence of UD cloth layers at the lower end of the silicone mold from being wrapped during pouring.

[0086] Specifically, the obtuse angle formed by the plane where the second continuous felt is located and the plane where the third plane is located is α3, and α3 is 120°.

[0087] Specifically, the silicone mold needs to be pre-treated before positioning. The pre-treatment is to wrap a layer of non-porous isolation film on the outer surface of the silicone mold, and then use transparent tape to seal it. The seal must be tight to prevent resin from entering the silicone mold during vacuum infusion and reducing the service life of the silicone mold.

[0088] Preferably, the non-porous isolation membrane is made of polypropylene or polyethylene.

[0089] Step 5: Laying down the second sequence of UD fabric layers;

[0090] Specifically, the second sequence UD fabric has a total of 45 layers, a width of 250mm, and a weight of 300g / m 2 The fabric type is UDS-1250. According to the process requirements, the second sequence UD cloth layer is laid between the flange surface, the silicone mold, and the first sequence UD cloth layer at the starting and ending positions. The cloth layer is required to be close to the flange surface, the silicone mold, and the second sequence UD cloth layer. The gap area is filled with yarn to avoid resin-rich sides after vacuum infusion.

[0091] Step 6: Connect the silicone mold to the first sequence UD fabric layer and the second sequence UD fabric layer; Step 6 specifically includes the following steps:

[0092] a. Remove the silicone mold from a sequence of UD fabric layers; at this time, the second continuous felt is also removed accordingly;

[0093] b. Lay a second release cloth and a perforated isolation film 8, wherein the second release cloth contacts the first release cloth at the outer side of the multi-sequence UD cloth, and the perforated isolation film 8 is laid on the second release cloth. The second release cloth covers the first-sequence UD cloth layer and the second-sequence UD cloth layer, and extends to both ends of the first-sequence UD cloth layer and the second-sequence UD cloth layer. The perforated isolation film extends from the first-sequence UD cloth layer to the second-sequence UD cloth layer, and the distance between the rear edge of the perforated isolation film and the flange surface is A, and the value of A is 100 mm.

[0094] c. Position according to step 4, place the second continuous felt, the silicone mold, and the guide net. The silicone mold is placed on the second continuous felt, and the second continuous felt is placed on a first-sequence UD cloth layer. The guide net covers the first-sequence UD cloth layer and the second-sequence UD cloth layer, and also covers the silicone mold. The guide net is connected and fixed 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 fixed together by spraying glue.

[0095] Specifically, the distance between the trailing edge of the guide net and the flange surface is A, and the value of A is 100 mm. The guide net extends from the upper end of a sequence of UD cloth layers to the fourth surface, the third surface, and a sequence of UD cloth layers of the silicone mold.

[0096] Specifically, step c also includes laying a first exhaust pipe 1, a second exhaust pipe 11, a glue injection pipe (not shown in the figure), and a vacuum bag film (not shown in the figure); wherein, the first exhaust pipe and the second exhaust pipe are located on the two ends of the first release cloth and the second release cloth, and the laying of the first exhaust pipe, the second exhaust pipe, the vacuum bag film, and the glue injection pipe are all existing technologies and will not be described in detail here.

[0097] Specifically, the first sequence of UD cloth layers, the first sequence of UD cloth layers, the first release cloth, the second release cloth, the first continuous felt, and the second continuous felt are made of conventional materials, wherein the first release cloth and the second release cloth are made of nylon 6.

[0098] Step 7: Establish vacuum, maintain pressure, and perform infusion and curing. After all fabric layers and auxiliary materials are laid, establish a vacuum system with a vacuum degree of ≤-0.095MPa, and after closing the exhaust system, maintain pressure for 10 minutes, requiring the vacuum degree to drop by ≤0.002MPa. The ambient temperature must be controlled at 25°C, and perform infusion and curing after maintaining pressure. First, heat at 50°C for 2h, and then heat at 80°C for 4h. After the product is cured, remove the surface auxiliary materials to obtain a multi-sequence UD product with smooth sides, thereby improving the UD molding efficiency and the matching of UD and shell core materials, thereby improving the shell molding efficiency and quality.

[0099] Specifically, the resin used for the infusion is 190 / 195 resin produced by Daosheng Tianhe.

[0100] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A multi-sequence UD molding method for wind turbine blades, characterized in that: The following steps are involved: S1. UD mold preparation: clean the surface of the UD mold and apply a release agent on the inner surface of the UD mold; S2, laying a first continuous felt and a first release cloth on the UD mold in sequence; S3, laying of a sequence of UD fabric layers; S4, silicone mold preparation: positioning the silicone mold according to the first sequence UD cloth layer and the second sequence UD cloth layer; S5, laying of second sequence UD fabric layers; S6, connecting the silicone mold to the first sequence UD fabric layer and the second sequence UD fabric layer; S7, vacuum establishment, pressure maintenance, infusion and curing.

2. A multi-sequence UD molding method for wind turbine blades according to claim 1, characterized in that: In step S6, the following steps are specifically included: S61, removing the silicone mold from a sequence of UD fabric layers; S62, laying a second release cloth and a perforated isolation film, wherein the perforated isolation film is laid on the second release cloth, the second release cloth covers the first sequence UD cloth layer and the second sequence UD cloth layer, and the perforated isolation film extends from the first sequence UD cloth layer to the second sequence UD cloth layer; S63, positioning according to step S4, placing the second continuous felt, the silicone mold and the guide net, the guide net covers the first sequence UD cloth layer and the second sequence UD cloth layer, and at the same time, the guide net is connected and fixed to the second continuous felt at the lower side of the silicone mold.

3. The multi-sequence UD molding method for wind turbine blades according to claim 1, characterized in that: In step S6, the cross section of the silicone mold is a quadrilateral, the laying cross section of the first sequence of UD fabric layers is a triangle, and the laying cross section of the second sequence of UD fabric layers is a quadrilateral.

4. A multi-sequence UD molding method for wind turbine blades 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, the angle between the first surface and the second surface is α2, 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.

5. A multi-sequence UD molding method for wind turbine blades according to claim 4, characterized in that: In step S4, when the silicone mold is positioned, a second continuous felt is placed on the lower end of the silicone mold, and the second surface is arranged on the second continuous felt.

6. A multi-sequence UD molding method for wind turbine blades according to claim 5, characterized in that: An obtuse angle formed by the surface where the second continuous felt is located and the surface where the third surface is located is α3, and α3>90°.

7. The multi-sequence UD molding method for wind turbine blades according to claim 1, characterized in that: The width of the first continuous felt and the second continuous felt is 100-300 mm.

8. The multi-sequence UD molding method for wind turbine blades according to claim 1, characterized in that: The first continuous felt and the second continuous felt have a gram weight of 200 to 300 g / m 2 .

9. The multi-sequence UD molding method for wind turbine blades according to claim 1, characterized in that: The first sequence of UD fabric layers is laid in 17 to 21 layers, and the second sequence of UD fabric layers is laid in 43 to 47 layers.

10. The multi-sequence UD molding method for wind turbine blades according to claim 1, characterized in that: In step S7, the vacuum degree during vacuum establishment is ≤-0.095 MPa, the pressure holding time is 5 to 15 minutes, and the vacuum degree decreases by ≤0.002 MPa.

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