Method for forming thermoplastic composite spar cap, and spar cap of wind turbine blade

Abstract

Disclosed in the present application are a method for forming a thermoplastic composite spar cap, and a spar cap of a wind turbine blade. The forming method comprises: using a thermoplastic resin material to form pultruded panel finished products each having a surface covered with peel ply; stacking in a preset mode the pultruded panel finished products and interlayer bonding layers having a bonding function, so as to generate a spar cap intermediate body; and arranging an adhesive-absorbing layer on a surface of the spar cap intermediate body, and performing curing treatment on the spar cap intermediate body to form a spar cap. During manufacturing the spar cap, the interlayer bonding layers can undergo a first soak in a thermoplastic resin, and the thermoplastic resin in a solidified state is stored; and during the process of curing the spar cap intermediate body, the thermoplastic resin melts at a specified temperature, and fibers in the interlayer bonding layers undergo a second soak therein.

Description

Thermoplastic composite main beam forming method and wind turbine blade main beam

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application 202311450720.3, filed on November 2, 2023, entitled “Thermoplastic composite main beam forming method and wind turbine blade main beam”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of wind power technology, and in particular relates to a thermoplastic composite main beam forming method and a wind turbine blade main beam. Background Art

[0004] The main beam is the main load-bearing member or structural member in the wind turbine blade. At present, the main beams of mainstream products all use pultruded plates as the layer material. The pultruded plates have a specified cross-section and thickness. The pultruded plates can be made of glass fiber or carbon fiber materials. Its structural configuration is a multi-layer unidirectional laminate structure. For the main beam design form of fabrics such as glass fiber or carbon fiber, the manufacturing process adopts the vacuum infusion method. With the vigorous development of the wind power industry, the current blade length has developed from 40m to more than 100m, and the blade root diameter has also developed from 2m to more than 4m. The length of large wind turbine blades generally exceeds 80m, the main beam thickness generally exceeds 50mm, and the width is also 300mm-600mm.

[0005] In the related art, due to the forming process of the pultruded plate itself, it is currently difficult to directly produce an integral pultruded main beam that is consistent with the size and contour of a large wind turbine blade. When making the main beam, the overall infusion process is generally adopted, or pultruded plates with a certain thickness and width are stacked, and an intermediate cloth layer is set between the pultruded plate layers, and the entire main beam is formed by resin infusion of the intermediate cloth layer. In the stacked structure formed by each pultruded plate layer, the diversion effect parallel to the interface direction between the pultruded plate layers is strong. In order to ensure the strength and rigidity of the intermediate cloth layer, the intermediate cloth layer is generally made of carbon fiber. However, carbon fiber has the problems of poor permeability and poor wettability. In the related art, when making the main beam of the wind turbine blade, resin infusion is required on site, which is prone to local poor impregnation and even dry yarn defects. These infusion defects will seriously affect the quality of the main beam and have a significant adverse impact on the safety of the wind turbine blade.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a thermoplastic composite main beam forming method and a wind turbine blade main beam, which can solve the problems of poor local impregnation and dry yarn caused by resin infusion during the production of large wind turbine blade main beams.

[0008] In one aspect, an embodiment of the present application provides a method for forming a thermoplastic composite main beam, the method comprising the following steps: using a thermoplastic resin material to form a pultruded plate product having a surface covered with a release cloth;

[0009] The pultruded plate product and the interlayer bonding layer having an adhesive effect are stacked and arranged in a preset manner to form a main beam intermediate body;

[0010] A glue absorbing layer is arranged on the surface of the main beam intermediate body, and the main beam intermediate body is cured to form the main beam.

[0011] According to one aspect of an embodiment of the present application, the finished pultruded plate is an initial pultruded plate with a conventional structure; or, the finished pultruded plate is a special-shaped pultruded plate with a special structure, and the finished pultruded plate with a surface covered with a release cloth formed by using a thermoplastic resin material comprises: forming the initial pultruded plate with a surface covered with a release cloth by using a thermoplastic resin material; and performing a melt modification treatment on the initial pultruded plate to generate the finished pultruded plate.

[0012] According to one aspect of an embodiment of the present application, the initial pultruded board with a surface covered with a release cloth is formed using a thermoplastic resin material, including: using a traction device to pass the fiber yarn through an impregnation tank provided with a thermoplastic resin material to form impregnated fibers; guiding and curing the impregnated fibers to produce a pultruded board intermediate; covering the pultruded board intermediate with a release cloth and cutting it to form a plurality of initial pultruded boards with predetermined sizes.

[0013] According to one aspect of the embodiment of the present application, before the guiding and curing treatment of the impregnated fiber to produce the pultruded sheet intermediate, the method also includes: passing the impregnated fiber through a predetermined interval of a positioning roller group so that the thermoplastic resin material in the impregnated fiber of unit size is within a predetermined range.

[0014] According to one aspect of an embodiment of the present application, the initial pultruded plate has a deformation portion, and the initial pultruded plate is subjected to a melt-modification treatment to generate the pultruded plate finished product, comprising: transferring the initial pultruded plate to the interior of a first mold, the first mold being used to perform a melt-modification treatment on the initial pultruded plate and comprising a modification portion corresponding to the deformation portion; heating the interior of the first mold so that the initial pultruded plate is softened by the heat; and applying pressure to the first mold so that the modification portion squeezes the deformation portion to form the pultruded plate finished product.

[0015] According to one aspect of an embodiment of the present application, the pultruded plate product and the interlayer bonding layer with an adhesive effect are stacked and arranged in a preset manner to generate a main beam intermediate, including: based on the preset size of the main beam, processing multiple pultruded plate products to obtain standardized pultruded plate layers; laying the standardized pultruded plate layers and the interlayer bonding layer alternately at intervals to form the main beam intermediate, and the bottom and top layers of the main beam intermediate are both the standardized pultruded plate layers.

[0016] According to one aspect of an embodiment of the present application, the preset size of the main beam includes a preset length and a preset width, and based on the preset size of the main beam, multiple pieces of the pultruded plate finished products are processed to obtain a standardized pultruded plate layer, including: removing the demoulding cloth on the surface of the pultruded plate finished product to obtain a first pultruded plate; based on the preset length, multiple pieces of the first pultruded plate are cut and tensioned along the length direction of the first pultruded plate to obtain a second pultruded plate; based on the preset width, multiple pieces of the second pultruded plate are spliced ​​or cut along the width direction of the second pultruded plate to obtain the standardized pultruded plate layer consistent with the preset size of the main beam.

[0017] According to one aspect of an embodiment of the present application, along the width direction of the main beam intermediate body, both sides of the interlayer bonding layer and both sides of the standardized pultruded board layer have a glue spacing θ, and the glue spacing θ satisfies: 1mm≤θ≤5mm; the interlayer bonding layer includes at least one of a glue film, a prepreg and a semi-preg, an air guide felt and a fiber part.

[0018] According to one aspect of the embodiment of the present application, a glue-absorbing layer is provided on the surface of the main beam intermediate body, and the main beam intermediate body is cured to form the main beam, comprising: sequentially spreading an isolation film and a first glue-absorbing felt on the surface of a second mold, and the second mold is used to perform a curing treatment on the main beam intermediate body; transferring the main beam intermediate body to the interior of the second mold; spreading a second glue-absorbing felt on the surface of the main beam intermediate body, and the second glue-absorbing felt covers the vacuum port of the second mold; laying a vacuum tape along the edge of the second mold, and performing a vacuum treatment and a pressure-maintaining treatment on the second mold; after the second mold passes the pressure-maintaining treatment, performing a heating treatment and a heat-insulating treatment on the second mold to form the main beam.

[0019] On the other hand, an embodiment of the present application provides a wind turbine blade main beam, which is manufactured using the aforementioned thermoplastic composite main beam forming method.

[0020] The thermoplastic composite main beam forming method and wind turbine blade main beam provided in the embodiment of the present application use thermoplastic resin to impregnate fibers in the production of pultruded plates and the production of interlayer bonding layers between pultruded plates. The thermoplastic resin has the properties of softening when heated and hardening when cooled. The interlayer bonding layer in the present application can be impregnated with the thermoplastic resin for the first time and store the solidified thermoplastic resin. In the process of stacking the pultruded plates and the interlayer bonding layer and solidifying to form the main beam, the thermoplastic resin in the interlayer bonding layer can be melted again by heating and secondarily impregnated with the fibers in the interlayer bonding layer under pressure. The impregnation quality of the thermoplastic resin between the fibers can be fully guaranteed, and there is no need for a separate resin infusion operation. While ensuring the quality of the main beam forming, the use of auxiliary materials for infusion can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] FIG1 is a schematic diagram of a process for forming a thermoplastic composite main beam according to an embodiment of the present application;

[0023] FIG2 is a schematic diagram of a production process of an initial pultruded board according to an embodiment of the present application;

[0024] FIG3 is a schematic diagram of a manufacturing process for curing the main beam intermediate body according to an embodiment of the present application;

[0025] FIG4 is a schematic diagram of the production process of pultruded board according to an embodiment of the present application;

[0026] FIG5 is a schematic diagram of the layout of the initial pultruded plate melt modification according to an embodiment of the present application;

[0027] FIG6 is a schematic cross-sectional view of a finished pultruded plate according to an example of an embodiment of the present application;

[0028] FIG7 is a schematic cross-sectional view of an intermediate body of a main beam according to an example of an embodiment of the present application;

[0029] FIG8 is a schematic cross-sectional view of an intermediate body of a main beam of another example of an embodiment of the present application;

[0030] FIG9 is a schematic diagram of the curing layout of the main beam intermediate body according to an embodiment of the present application.

[0031] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0032] Figure numerals: fiber yarn 11; glue dipping tank 12; guide plate 13; curing device 14; traction device 15; cutting device 16; deformation part 17; initial pultruded board 1; first mold 2; modification part 21; pultruded board finished product 3; demolding cloth 31; interlayer bonding layer 4; isolation film 5; first glue suction felt 6; second glue suction felt 7; vacuum spiral tube 8. DETAILED DESCRIPTION

[0033] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0035] This application is based on the inventor's discovery and understanding of the following facts and problems:

[0036] Wind turbine blades are a crucial component of wind turbine generators. Materials used in their production primarily include glass / carbon fiber, structural adhesives, matrix resins, sandwich core materials, and antioxidant coatings. As components that directly face the wind to capture energy, the introduction of new composite materials into wind blade design and manufacturing has significantly changed the manufacturing process.

[0037] The main beam of the blade is generally made of materials with high specific strength or high specific stiffness, and its structural configuration is a multi-layer unidirectional laminate structure. For the main beam design form of fabrics such as glass fiber or carbon fiber, the manufacturing process adopts the vacuum infusion method, that is, the glass fiber layer is laid on the top of the main beam mold, and after the vacuum is sealed, the resin is infused and solidified into shape; with the widespread promotion of pultruded plates, pultruded plates with specified cross-sectional shapes are becoming the only choice for main beam layer laying materials. Pultruded plates are composite materials produced by passing continuous fibers or fabrics impregnated with resin through a mold of a specified shape under the action of traction equipment, and heating to solidify the resin. During the production process, the processed pultruded plates are stacked and placed, and cloth layers of certain specifications are laid between different layers and different stacks. Then they are bundled together and placed in the main beam mold or blade mold, and infused into shape, and finally become a main beam structure that meets the requirements.

[0038] With the booming wind power industry, blade lengths have grown from approximately 40 meters to over 100 meters, and blade root diameters have increased from 2 meters to over 4 meters. Currently, mainstream products use pultruded sheet metal as the paving material for the main beams, with a specified cross-section and thickness. Large wind turbine blades typically exceed 80 meters in length, are generally over 50 mm thick, and range in width from 300 to 600 mm. Due to limitations in the pultruded sheet metal forming process, it is currently difficult to directly produce pultruded main beams that match the dimensions of wind turbine blades. Consequently, pultruded sheets of a specific thickness and width are typically stacked in the thickness direction and spliced ​​in the width direction to create a main beam of a specified thickness and width. Because these main beams are multi-layered and stacked, existing blade infusion molding processes have a certain probability of infusion defects between the different layers, such as poor impregnation or dry yarn. Furthermore, pultruded main beams are generally made of carbon pultruded plates with excellent structural performance. Different carbon fiber cloths or carbon-glass blended fabrics are generally used as interlayer fabrics between pultruded plates to improve interface performance and conduct interlayer flow. However, carbon fiber has low permeability and poor wettability, often resulting in localized impregnation defects or even dry yarn defects. In order to solve the problem of difficult infusion molding of pultruded plate main beams for large wind turbine blades, in addition to studying the infusion process, research should also be conducted on interlayer fabric materials, making full use of existing materials and technical conditions to manufacture pultruded main beam molding methods with better quality and more stable processes, thereby reducing the incidence of defects in the manufacturing process.

[0039] The embodiments of the present application provide a thermoplastic composite main beam forming method and a wind turbine blade main beam. In this main beam forming method, the interlayer bonding layer 4 can be initially impregnated with a thermoplastic resin and store the solidified thermoplastic resin. During the stacking and solidification of the pultruded sheet and the interlayer bonding layer 4 to form the main beam, the thermoplastic resin in the interlayer bonding layer 4 can be re-melted by heating and, under pressure, a second time impregnates the fibers in the interlayer bonding layer 4. This ensures that the thermoplastic resin is fully impregnated between the fibers. The thermoplastic composite main beam forming method and the wind turbine blade main beam according to the embodiments of the present application are described in detail below with reference to Figures 1-9.

[0040] An embodiment of the present application provides a method for forming a thermoplastic composite main beam, as shown in FIG1 . The method for forming a thermoplastic composite main beam may include the following steps S110 - S130 .

[0041] S110 , using thermoplastic resin material to form a pultruded board product 3 , the surface of which is covered with a release cloth 31 .

[0042] In the present embodiment, it is understood that thermoplastic resin material refers to a class of organic polymer compounds with a linear or branched structure. Thermoplastic resin can harden at a specified temperature and soften upon heating without chemically reacting. The amount of resin can be determined by calculation. After the pultruded sheet product 3 is completely completed, the surface of the pultruded sheet product 3 is covered with a release cloth 31 to facilitate storage of the pultruded sheet product 3.

[0043] Based on this, the pultruded board product 3 made of thermoplastic resin material is not limited to the specific properties of a specific mold, and can be melted and shaped for the second time after heating, which can not only improve the forming efficiency of the pultruded board, but also reduce the use of a large number of other auxiliary materials in manufacturing.

[0044] S120, stacking and arranging the pultruded plate product 3 and the interlayer bonding layer 4 having an adhesive effect in a preset manner to generate a main beam intermediate.

[0045] In the embodiment of the present application, the main beam intermediate body is composed of multiple pultruded sheet products 3 and multiple interlayer bonding layers 4 alternately stacked together, with the interlayer bonding layers 4 connecting the multiple pultruded sheet products 3 into a whole. The interlayer bonding layers 4 have a bonding effect. Based on this, the main beam intermediate body is formed by connecting the pultruded sheet products 3 through the interlayer bonding layers 4. This replaces the process of pouring resin into the pultruded sheet products 3 to produce the main beam, eliminating the resin pouring process in the mold, simplifying the main beam forming process, and reducing the use of pouring auxiliary materials.

[0046] S130, setting a glue absorbing layer on the surface of the main beam intermediate body, and performing a curing treatment on the main beam intermediate body to form the main beam.

[0047] In the embodiment of the present application, the completed main beam intermediate body is transferred as a whole to a preset mold, and subjected to heating and pressurization treatment to solidify the main beam intermediate body. During the solidification and molding process of the main beam intermediate body, a glue-absorbing layer is coated on the outer surface of the main beam intermediate body to absorb the molten resin secreted by the prepreg / semi-preg in the interlayer bonding layer 4 during the heating and pressurization process, thereby ensuring that the prepreg material achieves zero glue retention during the curing process. Based on this, after the main beam is demolded, the operator does not need to separately polish the resin-rich and unqualified bonding surfaces on the edge of the main beam, and the quality control of the blade main beam processing and molding is excellent.

[0048] The above is a thermoplastic composite main beam forming method provided in an embodiment of the present application. First, a pultruded plate product 3 is produced, and the pultruded plate product 3 is stacked with an interlayer bonding layer 4. In the preparation of the pultruded plate product 3 and the interlayer bonding layer 4, thermoplastic resin is used as the matrix material to facilitate secondary modification of the pultruded plate product 3 and eliminate the pouring process in the traditional production of large wind turbine blade main beams.

[0049] In some embodiments, the finished pultruded sheet 3 is a conventionally structured initial pultruded sheet 1; alternatively, the finished pultruded sheet 3 is a special-shaped pultruded sheet with a special structure. As shown in FIG6 , the corners of the finished pultruded sheet 3 are arranged at right angles, and a layer of release cloth 31 is provided on both the upper and lower sides of the finished pultruded sheet 3.

[0050] An embodiment of the present application provides a method for manufacturing a special-shaped pultruded plate, which may include the following steps: (1) using a thermoplastic resin material to form an initial pultruded plate 1 whose surface is covered with a release cloth 31; (2) performing a melt-reforming treatment on the initial pultruded plate 1 to generate a pultruded plate finished product 3.

[0051] In some embodiments, the present application provides a method for forming an initial pultruded board with a surface covered with a release cloth using a thermoplastic resin material. During the pultruded board production process, as shown in Figure 4, fiber yarn 11 can be used as raw material, and multiple devices such as a dipping tank 12, a guide plate 13, a curing device 14, a traction device 15 and a cutting device 16 can be used to process the fiber yarn 11.

[0052] As shown in FIG2 , the method may include the following steps:

[0053] S210: Using the traction device 15, the fiber yarn 11 passes through the dipping tank 12 containing thermoplastic resin material to form dipped fiber.

[0054] In the embodiment of the present application, referring to Figure 4 , a thermoplastic resin is placed in a dipping tank 12. A positioning guide roller assembly is also provided within the dipping tank 12. The positioning guide roller assembly comprises a first roller assembly and a second roller assembly. The first roller assembly is positioned above the liquid level of the thermoplastic resin, while the second roller assembly is immersed within the thermoplastic resin. Consequently, the fiber yarn 11 is impregnated with the thermoplastic resin within the dipping tank 12. The thermoplastic resin gradually permeates the fiber yarn 11, forming a bonded, dipped fiber.

[0055] In one example, please refer to Figure 4, the first roller group can be composed of two guide rollers, and the second roller group is a positioning roller. Driven by the traction device 15, the fiber yarn 11 passes around the two guide rollers and one positioning roller, and is pre-impregnated with resin from the inside of the dipping tank 12 to form impregnated fiber.

[0056] In another example, the position of the positioning roller can be adjusted according to the needs of fiber impregnation. On the one hand, as the fiber yarn 11 continues to be impregnated, the content of the thermoplastic resin pre-placed in the impregnation tank 12 will gradually decrease, and the liquid level of the thermoplastic resin in the impregnation tank 12 will gradually decrease. When the position of the positioning roller is higher than the resin liquid level, the impregnation of the fiber yarn 11 will be affected. Therefore, in order to ensure that the fiber yarn 11 can be impregnated stably, the position of the positioning roller can be adjusted according to the resin content in the impregnation tank 12.

[0057] S220: Guide and solidify the impregnated fiber to produce a pultruded sheet intermediate.

[0058] In the embodiment of the present application, after the fiber yarn 11 is impregnated with resin, a guide plate 13 is used to guide the fiber yarn 11. After the fiber yarn 11 passes through the guide plate 13, the fiber yarn 11 impregnated with thermoplastic resin is cured and formed at a specified temperature provided by a curing device 14. Based on this, during the curing process of the impregnated fiber, the thermoplastic resin gradually solidifies and condenses into a whole after penetrating the fiber yarn 11. The solidified pultruded sheet intermediate can be stably stored and subsequently processed.

[0059] S230: Covering the pultruded sheet intermediate with a demoulding cloth and cutting it to form a plurality of initial pultruded sheets 1 with predetermined sizes.

[0060] In the embodiment of the present application, to ensure that the solidified pultruded sheet intermediate can be stored and transferred in a clean, stable, and integrated manner, a release cloth 31 can be applied to the surface of the pultruded sheet intermediate. The operator then cuts the formed pultruded sheet intermediate using a cutting device 16 to obtain multiple initial pultruded sheets 1. This allows the initial pultruded sheets 1 to be stably transferred and stored before the main beam intermediate is fabricated, and the thermoplastic resin in the initial pultruded sheets 1 can be preserved in a stable solid state.

[0061] In some embodiments, the present application provides a method for forming an initial pultruded board with a surface covered with a release cloth using a thermoplastic resin material. Before S220 (guiding and curing the impregnated fiber to produce a pultruded board intermediate), the method also includes: passing the impregnated fiber through a predetermined interval of a positioning roller group so that the thermoplastic resin material in the impregnated fiber of unit size is within a predetermined range.

[0062] Among them, since the predetermined interval of the positioning roller group is a fixed value, when the dipped fiber passes through the positioning roller group, the excess thermoplastic resin impregnated in the dipped fiber will be squeezed out, so that by adjusting the size of the predetermined interval, the content of the thermoplastic resin impregnated in the dipped fiber can be adjusted. Therefore, by adjusting the resin content impregnated in the fiber yarn 11, it is ensured that the thermoplastic resin material in the dipped fiber of unit size is within an appropriate range.

[0063] In some embodiments, the initial pultruded sheet 1 has a deformed portion, which can be a corner or other portion of the initial pultruded sheet 1. The corner can be a right angle. When manufacturing the initial pultruded sheet 1, the initial pultruded sheet 1 with a right angle is easier to shape. Since the initial pultruded sheet 1 uses a thermoplastic resin as a binder for connecting the fiber yarns 11, and the thermoplastic resin has the property of softening when heated and hardening when cooled, the initial pultruded sheet 1 can be melt-modified at a specified temperature to obtain a pultruded sheet product 3 with a special shape. Melting and modifying the initial pultruded sheet 1 to produce the pultruded sheet product 3 can include the following steps:

[0064] (1) The initial pultruded sheet 1 is transferred to the interior of the first die 2 . The first die 2 is used to perform a melt-reforming process on the initial pultruded sheet 1 and includes a reforming portion 21 corresponding to the deforming portion 17 .

[0065] (2) The interior of the first die 2 is heated to soften the initial pultruded sheet 1.

[0066] (3) Applying pressure to the first die 2 so that the reformed portion 21 squeezes the deformed portion 17 to form the pultruded plate product 3 .

[0067] As shown in FIG5 , when the initial pultruded sheet 1 is melt-modified, the initial pultruded sheet 1 is transferred to the interior of the first die 2, and the position of the deformed portion of the initial pultruded sheet 1 is checked to ensure that the deformed portion corresponds to the position of the deformed portion 21 of the first die 2. Based on this, after heating the first die 2, a pressure F is applied to squeeze the first die 2, so that the initial pultruded sheet 1 is compressed and deformed to form a pultruded sheet product 3.

[0068] In some embodiments, the interlayer bonding layer 4 can be composed of air guide felt, fiber parts, and at least one of adhesive film, prepreg and semi-preg. Therefore, by setting the air guide felt, the air permeability of the interlayer bonding layer 4 can be increased, avoiding the appearance of excessive bubbles in the interlayer bonding layer 4 during the pressure curing process.

[0069] It can be understood that the adhesive film is a viscous structural adhesive matrix bubble film. After the adhesive film is combined with the fiber part, it has cohesiveness and can form an intermediate layer connecting the upper and lower sides of the pultruded plate product 3. The prepreg is a fiber fabric that has been fully impregnated in the resin matrix in advance. The continuous fiber fabric in the semi-preg is only partially impregnated with the resin matrix, and there is a small amount of dry fiber yarn bundles that are not impregnated on one side. These dry fiber yarn bundles can complete the impregnation during the heating and curing process. Prepreg and semi-preg are pre-impregnated fibers / fabrics, and their resin content has been determined. The molding quality of the structure made of prepreg and semi-preg is relatively stable. In the solution of the present application, the resin matrix can be made of thermoplastic resin.

[0070] Based on this, prepregs and semi-pregs used in the blade main beam forming process undergo two impregnation processes. During the pre-impregnation of the fibers / fabric, the thermoplastic resin is first impregnated into the fibers and preserved in a solidified state. During the heating and curing process, the thermoplastic resin melts again and, under pressure, impregnates the fibers in the interlayer bonding layer 4 for a second time. The quality of the thermoplastic resin impregnation between the fibers is fully guaranteed, avoiding problems such as local impregnation defects and dry yarn caused by resin infusion. The prepregs and semi-pregs can be made using the dipping tank 12 in Figure 4.

[0071] In one example, the prepreg is a double-sided impregnated fiber fabric. During the impregnation process, a positioning roller is located at the bottom of the dipping tank 12. Alternatively, when the resin content is about to decrease to the position of the positioning roller, the operator promptly replenishes the resin inside the dipping tank 12. Alternatively, the position of the positioning roller is adjusted in real time as needed to ensure that the positioning roller is always immersed in the resin, ensuring that both sides of the fiber yarn 11 are immersed in the thermoplastic resin, thereby ensuring the impregnation quality of the prepreg.

[0072] In another example, the semi-preg is a fiber fabric that is impregnated on one side. During the impregnation process, the position of the positioning roller is adjusted in real time to ensure that the positioning roller is always at the critical liquid level of the resin. During the impregnation process, the fiber yarn 11 is not completely immersed in the resin, and one side of the fiber fabric is impregnated with resin to a certain extent, forming a semi-preg.

[0073] It is understandable that since thermoplastic resins can be stored in a more stable solidified state at low temperatures, prepregs and semi-pregs generally need to be stored in a cold storage (cold storage conditions: below 5°C) from the time they are produced until they are put into use, to ensure the stability of the prepregs and semi-pregs during long-term storage.

[0074] In some embodiments, the pultruded plate product 3 and the interlayer bonding layer 4 having an adhesive effect are stacked and arranged in a preset manner to form a main beam intermediate, which may include the following steps:

[0075] (1) Based on the preset size of the main beam, multiple pultruded plate products 3 are processed to obtain standardized pultruded plate layers. Each pultruded plate product 3 can be rolled and stored after production. In the process of using the pultruded plate product 3 to produce the main beam intermediate, the pultruded plate product 3 stored in a roll needs to be unfolded and cut into standardized pultruded plate layers according to the size of the main beam intermediate to be produced.

[0076] (2) Alternately laying standardized pultruded board layers and interlayer bonding layers 4 to form a main beam intermediate body, wherein the bottom and top layers of the main beam intermediate body are both standardized pultruded board layers. The pultruded board product 3 is processed according to the preset size of the main beam, and a standardized pultruded board layer is used as the bottom layer. Then, interlayer bonding layers 4 and standardized pultruded board layers are laid alternately from bottom to top to form the main beam intermediate body. Thus, under the connecting effect of the interlayer bonding layer 4, the main beam intermediate body is produced by stacking multiple standardized pultruded board layers, which can eliminate the process of pouring resin between multiple standardized pultruded board layers.

[0077] In one example, during the laying process of standardized pultruded board layers, the standardized pultruded board layers are fed forward by the traction unit of the board conveying platform. The board conveying platform is equipped with rollers that are flush with the platform surface and have low friction, so that the standardized pultruded board layers can move along the conveying platform. At the same time, the board conveying platform is equipped with guide devices and side baffles to prevent the standardized pultruded board layers from falling off the platform. According to the starting and ending points of the layer, the conveying platform transports the standardized pultruded board layers to the corresponding axial positions, and then the conveying platform stops feeding and waits for lifting and transfer. After the standardized pultruded board layers are transported to the designated position, the vacuum suction cup tooling of the conveying platform lifts the standardized pultruded board layers and turns them to the layer laying platform for positioning and placement.

[0078] In another example, after each layer of standardized pultruded board is laid, the standardized pultruded board is laterally squeezed from the center of the blade toward the root and tip of the blade using the laying platform's lateral limiting device, so that the standardized pultruded board is firmly attached to the main beam sidewall of the laying platform.

[0079] In some embodiments, the preset dimensions of the main beam include a preset length and a preset width. Based on the preset dimensions of the main beam, processing a plurality of pultruded sheet products 3 to obtain a standardized pultruded sheet layer may include the following steps:

[0080] (1) The release cloth 31 on the surface of the pultruded plate product 3 is removed to obtain a first pultruded plate.

[0081] (2) Based on a preset length, multiple first pultruded plates are cut and tensioned along the length direction of the first pultruded plate to obtain a second pultruded plate.

[0082] (3) Based on the preset width, multiple second pultruded plates are spliced ​​or cut along the width direction of the second pultruded plate to obtain a standardized pultruded plate layer consistent with the preset size of the main beam.

[0083] In one example, removing the release cloth 31 from the surface of the pultruded board product 3 may include the following steps:

[0084] (1) Check and confirm that the unwinder, stripping cloth tearing equipment, chamfering grinding head, conveying stacking platform and lifting and locking tooling equipment are operating normally and free of dust residue. Use a flat sling to pass under the flat pultruded plate finished product 3 coil and use a crane to lift the coil to a height of less than 1.5m.

[0085] (2) Remove the limit rib of the unwinder and adjust the movable support of the unwinder so that the movable support is set upward, and then adjust the outer diameter of the movable support of the unwinder to the minimum. After lifting the coil of the pultruded plate product 3, adjust the coil direction of the pultruded plate product 3 to be clockwise, operate the crane to move the coil of the pultruded plate product 3 to the feeding side of the unwinder, and then fine-tune the unwinder so that the packaging strapping tape of the coil of the pultruded plate product 3 does not interfere with the unwinder support, and then place the inner diameter of the coil of the pultruded plate product 3 on the fixed support of the unwinder, and slowly lower the crane until the strap is no longer tight.

[0086] (3) Install the limit retaining edge of the unwinder, adjust the movable support to fit tightly with the inner diameter of the pultruded plate product 3 coil, adjust the outer diameter pressure roller of the unwinder to fit tightly with the outer diameter of the pultruded plate product 3 coil, slowly rotate the unwinder for one circle, visually check that the pultruded plate product 3 coil does not shake, then remove the sling and the overhead crane, use scissors to cut the packing tape of the pultruded plate product 3 coil one by one, and remove the packing tape and coil protective gasket. Use a wallpaper knife to pick up the release cloth 31 on the upper and lower sides of the plate from the end of the pultruded plate product 3, tear the release cloth 31 to a specified length in the opposite direction of the unwinding direction, fix the plate end after tearing off the release cloth to the traction roller of the unwinder, and wind the release cloth 31 on the upper and lower sides of the plate onto the winding rollers of the winding machine on the upper and lower sides of the plate, and wind the release cloth 31 on the winding rollers at least once, while ensuring that the release cloth 31 is in a taut state.

[0087] Optionally, the unwinder's initial unwinding speed is 0.5 m / s, and the maximum unwinding speed during subsequent operation is ≤ 1 m / s. Check the stability of the fixed pultruded sheet product 3 coil. After the end of the stripper cloth 31 is fixed and the end of the pultruded sheet product 3 is between the traction rollers, start the unwinder to unwind. When a roll of pultruded sheet material is processed, remove the stripper cloth 31 from the winder, clean the dust and debris on the winding rollers and the pultruded sheet product 3, and continue with the next end-fixing operation of the stripper cloth 31.

[0088] In another example, the release cloth 31 at the bottom of the pultruded board product 3 corresponding to the first layer of standardized pultruded board layer and the release cloth 31 at the top of the pultruded board product 3 corresponding to the last layer of standardized pultruded board layer can be retained in stages according to the molding timing.

[0089] In another example, cutting and tensioning a plurality of first pultruded sheets along a length direction of the first pultruded sheet may include the following steps:

[0090] (1) According to the input plate length setting parameters, the linear speed meter of the unwinding machine traction unit is used to automatically measure the length of the unwinding first pultruded plate, and the feedback signal is fed back according to the fixed length requirement. After the plate cutting equipment receives the fixed length signal, the cutting saw head is started to cut the first pultruded plate. In order to ensure the continuous operation of the production line, the cutting saw head should not only move horizontally perpendicular to the length direction of the first pultruded plate, but also move in the longitudinal direction of the first pultruded plate, and the longitudinal movement speed should be consistent with the unwinding speed to ensure that the cut end surface of the first pultruded plate is flush.

[0091] (2) The end of the first pultruded sheet is chamfered and ground from the blade tip to the blade root using a chamfering grinder. After the first pultruded sheet is chamfered and ground, it is conveyed through a sheet cleaning unit, which removes all dust generated during the previous grinding operation. The cut and cleaned first pultruded sheet is flattened and tensioned to form a second pultruded sheet.

[0092] In some embodiments, the standardized pultruded sheet layers can be butted together after being stacked in multiple layers. Thus, the standardized pultruded sheet layers can be full width or can be butted together in multiple widths. When manufacturing the standardized pultruded sheet layers, multiple second pultruded sheets can be spliced ​​or cut along the width of the second pultruded sheet according to actual size requirements.

[0093] In one example, as shown in FIG7 , the standardized pultruded plate layers in the middle of the main beam are butt-jointed with multiple widths in the width direction, and the interlayer bonding layer 4 is sandwiched between adjacent standardized pultruded plate layers. The interlayer bonding layer 4 is arranged corresponding to the standardized pultruded plate layers, and is butt-jointed with multiple widths in the width direction.

[0094] In another example, as shown in Figure 8, the standardized pultruded plate layer in the middle of the main beam is full width in the width direction, and the interlayer bonding layer 4 is sandwiched between adjacent standardized pultruded plate layers. The interlayer bonding layer 4 is arranged corresponding to the standardized pultruded plate layer and is full width in the width direction.

[0095] In one example, referring to Figures 7 and 8, the interlayer bonding layer 4 is composed of an air guide felt, a fiber cloth layer, and a prepreg, wherein the prepreg is arranged at the bottom, and the air guide felt can be sandwiched between the fiber cloth layer and the prepreg. In addition, the prepreg can be a carbon fiber prepreg. Laying the interlayer bonding layer 4 can include the following steps:

[0096] (1) Transfer the carbon fiber prepreg stored in the cold storage to a hot room for preheating and thawing, and record the preheating start date and preheating end time. The thawing conditions are generally: place it at 25℃ for 24 hours. If the temperature is low, use a hot air blower, air conditioner or other heating equipment to heat the environment so that the surface temperature of the carbon fiber prepreg is controlled at around 25℃. During the preheating and thawing process of the carbon fiber prepreg, the operator needs to regularly measure the temperature around the carbon fiber prepreg. If the temperature exceeds the allowable range, the air outlet temperature of the heating equipment needs to be adjusted.

[0097] (2) After the carbon fiber prepreg is thawed, the protective film of the carbon fiber prepreg is torn off, the cloth-mounting bracket on the cloth-laying vehicle is removed, and the cloth-mounting bracket is inserted from one side of the carbon fiber prepreg. Then, the hook is passed through the cloth-mounting bracket, and the carbon fiber prepreg is lifted by a crane and transferred to the chordal position on the bracket of the cloth-laying vehicle for installing and fixing the carbon fiber prepreg, and then the pre-adjusted tension is set. It is understandable that due to the large size of large wind turbine blades, a cloth-laying vehicle can be used to lay the interlayer bonding layer 4. Optionally, the pre-adjusted tension is 260N.

[0098] (3) Insert the carbon fiber prepreg along the upper part of the transmission rod and pass it out from the lower part, and pull out the fiber cloth layer from the root position of the wind turbine blade. (When pulling the fiber cloth layer, the operator should hold the middle position and cannot directly hold the two sides to pull it up to prevent the fiber cloth layer from loosening.) Align the end points of the fiber cloth layer with the corresponding marked position of the mold and put it down. Press the fiber cloth layer with both hands. Stick a layer of paper tape on the upper and lower sides of the air guide felt end face prepared in advance. An operator is assigned to each side of the air guide felt to hold the paper tape and gently pull the paper tape out a distance until the carbon fiber prepreg is aligned. After adjusting the two sides to exceed the carbon fiber prepreg by 20mm, stick the air guide felt and the carbon fiber prepreg together and pull it out together with the carbon fiber prepreg, and then proceed to the next step of the laying operation; cut the paper tape used to fix the air guide felt together with part of the air guide felt, align the end points of the fiber cloth layer with the corresponding marked position of the mold and put it down. Press the cloth layer with both hands.

[0099] (4) Start the trolley at an appropriate speed to move toward the blade tip. The trolley should not be too fast and should not stop during the driving process to prevent the roller from pressing chordal wrinkles on the fiber cloth layer. The operators on both sides of the mold smooth and compact the fiber cloth layer axially from the root to the tip. The distance between the trolley and the person smoothing the fiber cloth layer should not exceed 2m. When the fiber cloth layer is laid to the end position of the blade tip, use a tape measure to straighten and align the position lines on both sides of the mold, draw a line on the film of the fiber cloth layer along the edge of the tape measure, and place the aluminum tooling under the cloth layer in the direction perpendicular to the axis of the mold. Then put down the fiber cloth layer, align the middle seam of the fiber cloth layer with the marked line, and use a wallpaper knife to cut the fiber cloth layer along the middle seam.

[0100] The above steps illustrate a method for laying the interlayer bonding layer 4 between pultruded plates of a wind turbine blade.

[0101] In some embodiments, along the width direction of the middle body of the main beam, both sides of the interlayer bonding layer 4 and both sides of the standardized pultruded plate layer have a glue interval θ, and the glue interval θ satisfies: 1mm≤θ≤5mm.

[0102] In the embodiment of the present application, the prepreg in the interlayer bonding layer 4 has been impregnated with a certain amount of resin, and its width can be a certain size narrower than the width of the standardized pultruded board layer (generally 3 mm). In this way, it can be ensured that after the prepreg is heated and cured, the resin can flow to the edge of the standardized pultruded board layer and achieve complete filling.

[0103] In some embodiments, the present application provides a method for forming a main beam by providing a glue absorbing layer on the surface of a main beam intermediate body and curing the main beam intermediate body. As shown in FIG3 , the method may include the following steps:

[0104] S310, the isolation film 5 and the first adhesive-absorbing felt 6 are sequentially spread on the surface of the second mold, and the second mold is used to perform a curing process on the main beam intermediate body.

[0105] In the embodiment of the present application, before laying the isolation film 5, the second mold is first cleaned of all pollution sources such as dust and glue residue on the surface. Then, the isolation film 5 is laid, and a layer of first adhesive-absorbing felt 6 is fully laid on top of the isolation film 5. Based on this, the laying of the isolation film 5 protects the surface of the second mold, and the first adhesive-absorbing felt 6 can absorb resin overflowing from the bottom of the main beam intermediate body to a certain extent.

[0106] S320, transferring the main beam intermediate body to the interior of the second mold.

[0107] In this embodiment, the laying of standardized pultruded panels and interlayer bonding layers 4 is repeated until completion. After the standardized pultruded panels and interlayer bonding layers 4 are laid, the resulting main beam intermediate is secured using fiber mesh tape of a specified specification. The secured main beam intermediate is then transferred to the interior of a second mold. This allows the main beam intermediate to undergo further curing and molding within the pre-set second mold.

[0108] S330. Fully spread the second adhesive-absorbing felt 7 on the surface of the middle body of the main beam, and the second adhesive-absorbing felt 7 covers the vacuum port of the second mold.

[0109] In the embodiment of the present application, the second adhesive felt 7 covers the entire middle body of the main beam. If the length of the second adhesive felt 7 is insufficient, the second adhesive felt 7 can be overlapped. The spiral tube is wrapped with 10 cm wide adhesive felt and placed on the laid adhesive felt, and the whole is placed above the vacuum port. Based on this, the vacuum port of the second mold can absorb excess resin due to the provision of the second adhesive felt 7, thereby ensuring that the internal channel of the vacuum port is not occupied by resin.

[0110] S340: Lay vacuum tape along the edge of the second mold, and perform vacuum treatment and pressure holding treatment on the second mold.

[0111] In this embodiment, two vacuum tapes are laid along the edges of the second mold, extending beyond the vacuum evacuation port. After the tapes are removed, a vacuum pump is activated to evacuate the mold. Pressure maintenance begins when the vacuum pump display remains stable for 5 minutes. This process, by evacuating the interior of the second mold and maintaining the pressure, provides the necessary external conditions for the curing and forming of the main beam intermediate body.

[0112] S350: After the second mold passes the pressure maintenance test, the second mold is subjected to heating and heat preservation treatment to form the main beam.

[0113] In the embodiment of the present application, after the second mold passes the pressure-holding test, it is heated. A mold heater can be set based on the required heating temperature. When the surface temperature of the second mold is below 100°C, insulation cotton is placed on the surface of the second mold. When the surface temperature of the second mold exceeds 110°C, the insulation cotton is removed. Operators measure and record the temperature at specified intervals. Based on this, heating melts the thermoplastic resin in the middle of the main beam and fully impregnates the fibers under pressure.

[0114] In one example, as shown in Figure 9, it is a schematic diagram of the curing layout of a main beam intermediate body, in which the pultruded plate finished product 3 and the interlayer bonding layer 4 of the main beam intermediate body are arranged in the full width direction, and the outer side of the main beam intermediate body is provided with a first adhesive felt 6 and a second adhesive felt 7, and the lower side of the first adhesive felt 6 is provided with an isolation film 5, and two groups of exhaust spiral tubes 8 are provided between the first adhesive felt 6 and the second adhesive felt 7. The two groups of exhaust spiral tubes 8 are symmetrically arranged, and the exhaust spiral tubes 8 can be used as exhaust channels when the second mold is vacuumed.

[0115] It is understandable that, since both sides of the interlayer bonding layer 4 and both sides of the standardized pultruded board layer have a glue gap θ, when the main beam intermediate body is heated and pressurized for solidification and molding, the excess portion of the molten thermoplastic resin can be filled into the cavity corresponding to the glue gap θ when it secondarily infiltrates the fibers in the interlayer bonding layer 4. In addition, by providing the first glue-absorbing felt 6 and the second glue-absorbing felt 7, when the molten thermoplastic resin still remains after infiltrating the main beam intermediate body, the remaining portion can also be absorbed by the first glue-absorbing felt 6 and the second glue-absorbing felt 7, thereby achieving zero glue retention during the curing process of the main beam intermediate body, and after the product is demoulded, it is no longer necessary to separately polish the resin-rich and unqualified bonding surfaces at the edges.

[0116] In some embodiments, the present application provides a wind turbine blade main beam, which is processed and manufactured using the aforementioned main beam forming method.

[0117] During the manufacture of the wind turbine blade main beam in this application, the interlayer bonding layer 4 is initially impregnated with thermoplastic resin and stores the solidified thermoplastic resin. During the solidification process of the main beam intermediate, the thermoplastic resin melts and secondary impregnates the fibers in the interlayer bonding layer 4. The impregnation quality of the thermoplastic resin between the fibers is fully guaranteed, eliminating the need for a separate resin infusion operation, and fully ensuring the quality of the wind turbine blade main beam.

[0118] It should be understood that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated. Those skilled in the art can make various changes, modifications, and additions, or change the order of the steps after understanding the spirit of the present application.

[0119] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps. In other words, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0120] The above is only a specific implementation method of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited to this. Any technician familiar with this technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the scope of protection of this application.

Claims

1. A method for forming a thermoplastic composite main beam, comprising: A thermoplastic resin material is used to form a pultruded board product whose surface is covered with a release cloth; The pultruded plate product and the interlayer bonding layer with bonding effect are stacked and arranged in a preset manner to form a main beam intermediate; A glue absorbing layer is arranged on the surface of the main beam intermediate body, and the main beam intermediate body is cured to form the main beam.

2. The thermoplastic composite main beam forming method according to claim 1, wherein: The finished pultruded board is an initial pultruded board with a conventional structure; or The pultruded plate product is a special-shaped pultruded plate with a special structure, and the pultruded plate product is formed by using a thermoplastic resin material and covered with a release cloth on the surface, and comprises: Using thermoplastic resin material to form the initial pultruded plate with the surface covered with a release cloth; The initial pultruded sheet is subjected to a melt-modification process to generate the pultruded sheet product.

3. The thermoplastic composite main beam forming method according to claim 2, wherein: The method of using thermoplastic resin material to form the initial pultruded plate with the surface covered with a release cloth comprises: Using a traction device, the fiber yarn passes through a dipping tank provided with a thermoplastic resin material to form a dipped fiber; The dipped fibers are guided and cured to produce a pultruded sheet intermediate; The pultruded sheet intermediate is covered with a demoulding cloth and cut to form a plurality of initial pultruded sheets with predetermined sizes.

4. The method for forming a thermoplastic composite main beam according to claim 3, wherein: Before the dipped fibers are guided and cured to produce a pultruded sheet intermediate, the method further comprises: The dipped fibers are passed through a predetermined interval of a positioning roller set so that the thermoplastic resin material in the dipped fibers of a unit size is within a predetermined interval.

5. The method for forming a thermoplastic composite main beam according to claim 2, wherein: The initial pultruded plate has a deformed portion, and the initial pultruded plate is subjected to a melt-reforming process to generate the pultruded plate finished product, comprising: Transferring the initial pultruded sheet to the interior of a first mold, wherein the first mold is used to perform a melt-modification process on the initial pultruded sheet and comprises a modification portion corresponding to the deformation portion; Heating the interior of the first mold to soften the initial pultruded sheet; Applying pressure to the first die so that the modified portion squeezes the deformed portion to form the pultruded plate product.

6. The method for forming a thermoplastic composite main beam according to claim 1, wherein: The method of stacking the pultruded plate product and the interlayer bonding layer with bonding effect in a preset manner to generate a main beam intermediate comprises: Based on the preset size of the main beam, a plurality of the pultruded plate products are processed to obtain a standardized pultruded plate layer; The standardized pultruded board layers and the interlayer bonding layers are laid alternately and at intervals to form the main beam intermediate body, and the bottom layer and the top layer of the main beam intermediate body are both the standardized pultruded board layers.

7. The method for forming a thermoplastic composite main beam according to claim 6, wherein: The preset size of the main beam includes a preset length and a preset width. Based on the preset size of the main beam, a plurality of pultruded plate products are processed to obtain a standardized pultruded plate layer, including: Removing the demoulding cloth on the surface of the finished pultruded board to obtain a first pultruded board; Based on the preset length, cutting and tensioning a plurality of the first pultruded plates along the length direction of the first pultruded plates to obtain a second pultruded plate; Based on the preset width, a plurality of the second pultruded plates are spliced ​​or cut along the width direction of the second pultruded plates to obtain the standardized pultruded plate layer consistent with the preset size of the main beam.

8. The method for forming a thermoplastic composite main beam according to claim 6, wherein: Along the width direction of the middle body of the main beam, both sides of the interlayer bonding layer and both sides of the standardized pultruded plate layer have a glue interval θ, and the glue interval θ satisfies: 1mm≤θ≤5mm; The interlayer bonding layer includes at least one of an adhesive film, a prepreg and a semi-preg, an air guide felt and a fiber piece.

9. The method for forming a thermoplastic composite main beam according to claim 1, wherein: The method of providing a glue absorbing layer on the surface of the main beam intermediate body and curing the main beam intermediate body to form the main beam comprises: The isolation film and the first adhesive-absorbing felt are sequentially spread on the surface of the second mold, and the second mold is used to perform a curing treatment on the main beam intermediate body; Transferring the main beam intermediate body to the interior of the second mold; The second adhesive-absorbing felt is fully spread on the surface of the intermediate body of the main beam, and the second adhesive-absorbing felt covers the vacuum port of the second mold; Laying a vacuum tape along the edge of the second mold, and performing vacuum treatment and pressure holding treatment on the second mold; After the second mold passes the pressure maintenance test, the second mold is subjected to heating and heat preservation treatment to form the main beam.

10. A wind turbine blade main beam, manufactured by using the thermoplastic composite main beam forming method according to any one of claims 1 to 9.

Images