Wind power blade main beam manufacturing method and wind power blade

Abstract

The invention relates to a wind power blade main beam manufacturing method and a wind power blade. The wind power blade main beam manufacturing method comprises the steps that a pultrusion plate finished product is provided, the pultrusion plate finished product comprises a pultrusion plate and thermoplastic resin bodies, a plurality of flow guide grooves are formed in at least one surface of the pultrusion plate, a plurality of thermoplastic resin bodies are arranged on at least one surface of the pultrusion plate, and the pultrusion plate and the thermoplastic resin bodies form an integral structure; a main beam mold is provided, a main beam middle body formed by stacking a plurality of pultrusion plate finished products is arranged in the main beam mold, the main beam middle body comprises a plurality of layers of pultrusion plate finished products, and each layer of pultrusion plate finished products comprises a plurality of pultrusion plate finished products; a vacuum film is laid on the main beam middle body; vacuumizing equipment is used for exhausting air, so that negative pressure is formed in the vacuum film; and the thermoplastic resin body is heated, thermoplastic resin formed after the thermoplastic resin body is molten infiltrates the main beam intermediate, and thermoplastic resin curing treatment is carried out to form the main beam. According to the manufacturing method of the wind power blade main beam, the quality of the main beam is improved, and the safety of the wind power blade is improved.

Description

Technical Field

[0001] The present application relates to the field of wind power generation, and in particular to a method for manufacturing a main beam of a wind turbine blade and a wind turbine blade. Background Art

[0002] The main beam is the main load-bearing member or structural member in the wind turbine blade. The main beam uses multiple pultruded plates as the layer material. At present, the length of the wind turbine blade reaches 40 meters (m) to more than 100 meters, and the root diameter of the wind turbine blade reaches 2 meters to more than 4 meters. For example, the length of a large wind turbine blade is generally more than 80 meters. The thickness of the main beam of the wind turbine blade is generally more than 50 millimeters (mm), and the width is also 300 mm to 600 mm. In the manufacturing process of the main beam of the wind turbine blade, multiple pultruded plates with a certain thickness and width are first stacked in the thickness direction and spliced ​​in the width direction, and then the resin is infused and cured by the infusion molding process to form the entire main beam. However, since multiple pultruded plates are stacked to form a multi-layer structure, infusion defects such as poor wetting or dry yarn will occur between different pultruded plates, thereby affecting the quality of the main beam product and adversely affecting the safety of the wind turbine blade. Summary of the invention

[0003] The present application provides a method for manufacturing a main beam of a wind turbine blade and a wind turbine blade, which are beneficial to improving the quality of the main beam and improving the safety of the wind turbine blade.

[0004] The present application provides a method for manufacturing a wind turbine blade main beam, which includes:

[0005] A pultruded plate product is provided, the pultruded plate product comprises a pultruded plate and a thermoplastic resin body, a plurality of guide grooves are arranged on at least one surface of the pultruded plate, a plurality of thermoplastic resin bodies are arranged on at least one surface of the pultruded plate, and the pultruded plate and the thermoplastic resin body form an integral structure;

[0006] A main beam mold is provided, in which a main beam intermediate body formed by stacking a plurality of pultruded plate finished products is arranged, the main beam intermediate body includes a plurality of layers of pultruded plate finished products, and each layer of pultruded plate finished products includes a plurality of pultruded plate finished products;

[0007] Laying a vacuum membrane on the middle of the main beam;

[0008] Use vacuum equipment to extract air to create negative pressure inside the vacuum film;

[0009] The thermoplastic resin body is heated, and the thermoplastic resin formed after the thermoplastic resin body is melted infiltrates the main beam intermediate body, and the thermoplastic resin is cured to form the main beam.

[0010] The method for manufacturing the main beam of a wind turbine blade provided in an embodiment of the present application forms a finished pultruded plate by directly setting a thermoplastic resin body on a pultruded plate. Then, multiple finished pultruded plates are stacked to form a main beam intermediate. Multiple finished pultruded plates are stacked along the thickness direction and the width direction of the pultruded plate. The main beam intermediate is heated to melt the thermoplastic resin body in the main beam intermediate. The thermoplastic resin after the thermoplastic resin body is melted can infiltrate the pultruded plate. The guide groove can guide the gas between each pultruded plate finished product or guide the flow of the thermoplastic resin. The solidified thermoplastic resin can connect each pultruded plate, so that each pultruded plate and the solidified thermoplastic resin together form the main beam. The method for manufacturing the main beam of a wind turbine blade in an embodiment of the present application can replace the infusion molding process to make the main beam, and can simplify the main beam molding process, thereby eliminating the complex process of the infusion molding process, eliminating the laying of the infusion auxiliary materials, and eliminating the steps of resin mixing infusion. Therefore, the quality of the main beam formed by the method for manufacturing the main beam of a wind turbine blade in an embodiment of the present application is more stable and reliable, and the safety of the wind turbine blade is improved.

[0011] In some achievable embodiments, the guide groove and the thermoplastic resin body are simultaneously disposed on at least one surface of the pultruded plate; or, the guide groove and the thermoplastic resin body are respectively disposed on different surfaces of the pultruded plate.

[0012] In some achievable embodiments, among the multiple guide grooves disposed on at least one surface of the pultruded plate, the guide grooves are disposed at intervals; or, the multiple guide grooves disposed on at least one surface of the pultruded plate are intersected with each other to form a grid structure.

[0013] In some achievable embodiments, among the multiple guide grooves disposed on at least one surface of the pultruded plate, the guide grooves are disposed at intervals along the length direction of the pultruded plate.

[0014] In some achievable embodiments, the inner surface of the guide groove is an arc surface.

[0015] In some achievable embodiments, the depth of the guide groove ranges from 1.5 mm to 2.5 mm.

[0016] In some achievable embodiments, along the thickness direction of the pultruded plate, a plurality of thermoplastic resin bodies are disposed on the lower surface of the pultruded plate, and a plurality of guide grooves are disposed on the upper surface of the pultruded plate.

[0017] In some achievable embodiments, an air-conducting fiber layer is laid between any two adjacent layers of the pultruded board product; or, along the thickness direction of the pultruded board, any two adjacent layers of the pultruded board product are in direct contact with each other.

[0018] In some feasible embodiments, the cross-section of the pultruded plate is rectangular, and guide grooves are provided on the upper and lower surfaces of the pultruded plate along the thickness direction of the pultruded plate; or, the cross-section of the pultruded plate is rectangular, and in the middle body of the main beam, guide grooves are provided on the surfaces corresponding to each other in any two adjacent pultruded plates.

[0019] In some feasible embodiments, the cross-section of the pultruded plate is rectangular, and a thermoplastic resin body is provided on both the upper and lower surfaces of the pultruded plate along the thickness direction of the pultruded plate; or, the cross-section of the pultruded plate is rectangular, and in the middle of the main beam, a thermoplastic resin body is provided on the surfaces corresponding to each other in any two adjacent pultruded plates.

[0020] In some achievable embodiments, the height of the thermoplastic resin body protruding from the surface of the pultruded plate ranges from 1.5 mm to 2.5 mm.

[0021] In some achievable embodiments, the thermoplastic resin body includes at least one of a thermoplastic resin block and a thermoplastic resin strip.

[0022] In some achievable embodiments, an interface protective layer is respectively provided on the thermoplastic resin body and the guide groove of the finished pultruded board product, and the interface protective layer is removed before the step of stacking the finished pultruded board product in a main beam mold to form a main beam intermediate.

[0023] In some achievable methods, a thermoplastic resin infusion material is provided and a thermoplastic resin body is heated, the thermoplastic resin infusion material is injected into a vacuum film, the thermoplastic resin infusion material and the thermoplastic resin body are melted to form a thermoplastic resin that infiltrates a main beam intermediate, and the thermoplastic resin is cured to form the main beam.

[0024] An embodiment of the present application provides a wind turbine blade, which includes a main beam manufactured by a wind turbine blade main beam manufacturing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram of the structure of a wind turbine generator set provided in some embodiments of the present application;

[0027] Figure 2 A schematic diagram of the structure of a blade provided in some embodiments of the present application;

[0028] Figure 3 A schematic diagram of a partial cross-sectional structure of a blade provided in some embodiments of the present application;

[0029] Figure 4 A schematic diagram of a process for manufacturing a wind turbine blade main beam provided in some embodiments of the present application;

[0030] Figure 5 A schematic diagram of the structural layout of a method for manufacturing a wind turbine blade main beam provided in some embodiments of the present application;

[0031] Figure 6 A schematic diagram of a manufacturing process of a pultruded plate product provided in some embodiments of the present application;

[0032] Figure 7 A schematic diagram of a partial structure of a pultruded plate product provided in some embodiments of the present application;

[0033] Figure 8 A schematic diagram of a partial structure of a pultruded plate product provided in some embodiments of the present application;

[0034] Fig. 9 A schematic diagram of a partial structure of a main beam intermediate body provided in some embodiments of the present application;

[0035] Fig.10 A schematic diagram of a partial structure of a pultruded plate product provided in some embodiments of the present application;

[0036] Fig.11 A schematic diagram of a partial structure of a pultruded plate product provided in some embodiments of the present application;

[0037] Fig.12 A schematic diagram of a partial structure of a pultruded plate product provided in some embodiments of the present application;

[0038] Fig.13 A schematic diagram of a partial structure of a main beam intermediate body provided in some embodiments of the present application;

[0039] Fig.14 A schematic diagram of a partial structure of a pultruded plate product provided in some embodiments of the present application;

[0040] Fig.15 A schematic diagram of a partial structure of a main beam intermediate body provided in some embodiments of the present application;

[0041] Fig.16 A schematic diagram of a partial structure of a connection state between an interface protection layer and a pultruded plate product provided in some embodiments of the present application;

[0042] Fig.17 A schematic diagram of the structural layout of a method for manufacturing a wind turbine blade main beam provided in some embodiments of the present application;

[0043] Fig.18 A schematic flow chart of a method for manufacturing a wind turbine blade main beam provided in some embodiments of the present application.

[0044] In the drawings, the drawings are not necessarily drawn to scale.

[0045] Description of reference numerals:

[0046] 10. pultruded plate; 10a. guide groove; 11. upper surface; 12. lower surface; 20. thermoplastic resin body; 30. pultruded plate finished product; 40. main beam mold; 50. main beam intermediate; 60. vacuum membrane; 70. air-conducting fiber layer; 80. interface protection layer;

[0047] 100, wind turbine generator set; 110, blade; 120, main beam; 130, shell; 140, web;

[0048] 200, fiber yarn; 210, dipping tank; 220, pultrusion device; 230, resin extrusion device; 240, traction device; 250, cutting device;

[0049] 300, isolation film; 310, first adhesive absorption layer; 320, second adhesive absorption layer; 330, air extraction pipe;

[0050] X, thickness direction;

[0051] Y, width direction;

[0052] Z, length direction. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0055] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0058] The term "plurality" used in the present application refers to two or more (including two).

[0059] Figure 1 The structure of the wind turbine generator set 100 is schematically shown. Figure 1 As shown, an embodiment of the present application provides a wind turbine generator set 100 .

[0060] The wind turbine generator set 100 includes a tower, a nacelle and a wind rotor. The nacelle is arranged at the top of the tower. The wind rotor includes a hub and blades 110. The blades 110 are connected to the hub. The hub is connected to the main shaft of the nacelle. The blades 110 can generate torque under the action of wind. The blades 110 and the hub drive the main shaft of the nacelle to rotate, thereby converting wind energy into mechanical energy. The main shaft of the nacelle can be connected to the rotor of the generator, thereby converting mechanical energy into electrical energy.

[0061] Figure 2 The structure of the blade 110 is schematically shown. Figure 3 The partial cross-sectional structure of the blade 110 is schematically shown. Figure 2 and Figure 3 As shown, the embodiment of the present application provides a blade 110. The blade 110 includes a main beam 120, a shell 130 and a web 140. The main beam 120 is connected to the shell 130. The web 140 is arranged between two main beams 120 arranged at intervals. The web 140 can support the main beam 120.

[0062] In the related art, pultruded plates are used as the layering material of the main beam 120. During the production of the pultruded plate, the continuous fiber yarn is impregnated with a thermosetting resin, and then the continuous fiber impregnated with the resin is passed through a pultrusion die of a predetermined shape. The pultrusion die pultrudes the continuous fiber impregnated with the resin to form a continuous pultruded plate. The continuous pultruded plate enters the traction machine and is led out. Subsequently, according to the size design requirements of the main beam 120, the continuous pultruded plate is cut to form a plurality of pultruded plates to constitute the main beam 120. During the manufacturing process of the main beam 120 of the wind turbine blade 110, a plurality of pultruded plates with a certain thickness and width are first stacked in the thickness direction of the pultruded plate, and spliced ​​in the width direction of the pultruded plate to form a multi-layer pultruded plate. An interlayer fabric is laid between any two adjacent layers of pultruded plates. The interlayer fabric includes carbon fiber cloth or carbon-glass blended fabric. Then, an infusion molding process is used to perform resin infusion and curing to form the entire main beam 120. However, due to the low permeability and poor wettability of the interlayer fabric, defects such as poor local wettability or even dry yarn often occur in the main beam 120 manufactured by the infusion molding process.

[0063] The embodiment of the present application provides a method for manufacturing a main beam of a wind turbine blade, which can ensure that the quality of the main beam 120 is more stable and reliable, and improve the safety of the wind turbine blade 110.

[0064] Figure 4 The process of the method for manufacturing the main beam of a wind turbine blade is schematically shown. Figure 5 The structural layout of the wind turbine blade main beam manufacturing method is schematically shown. Figure 4 and Figure 5 As shown, the embodiment of the present application provides a method for manufacturing a main beam of a wind turbine blade, which comprises:

[0065] A pultruded plate product 30 is provided, the pultruded plate product 30 comprises a pultruded plate 10 and a thermoplastic resin body 20, a plurality of guide grooves 10a are provided on at least one surface of the pultruded plate 10, a plurality of thermoplastic resin bodies 20 are provided on at least one surface of the pultruded plate 10, and the pultruded plate 10 and the thermoplastic resin body 20 form an integral structure;

[0066] A main beam mold 40 is provided, in which a main beam intermediate body 50 formed by stacking a plurality of pultruded plate finished products 30 is arranged, the main beam intermediate body 50 includes a plurality of pultruded plate finished products 30, and each layer of pultruded plate finished products 30 includes a plurality of pultruded plate finished products 30;

[0067] Laying a vacuum membrane 60 on the main beam intermediate body 50;

[0068] Use a vacuum device to evacuate air so that the vacuum film 60 is under negative pressure;

[0069] The thermoplastic resin body 20 is heated, and the thermoplastic resin formed after the thermoplastic resin body 20 is melted infiltrates the main beam intermediate body 50, and the thermoplastic resin is cured to form the main beam 120.

[0070] The method for manufacturing the main beam of a wind turbine blade provided in an embodiment of the present application forms a pultruded plate product 30 by directly setting a thermoplastic resin body 20 on a pultruded plate 10. Then, a plurality of pultruded plate products 30 are stacked to form a main beam intermediate body 50. A plurality of pultruded plate products 30 are stacked along the thickness direction X and the width direction Y of the pultruded plate 10. The main beam intermediate body 50 is heated to melt the thermoplastic resin body 20 in the main beam intermediate body 50. The thermoplastic resin after the thermoplastic resin body 20 is melted can infiltrate the pultruded plate 10. The guide groove 10a can guide the gas existing between each pultruded plate product 30 or can guide the flow of the thermoplastic resin. The solidified thermoplastic resin can connect each pultruded plate 10, so that each pultruded plate 10 and the solidified thermoplastic resin together form a main beam 120. The wind turbine blade main beam manufacturing method of the embodiment of the present application can replace the infusion molding process to manufacture the main beam 120, and can simplify the main beam 120 molding process, thereby eliminating the complex process of the infusion molding process, eliminating the steps of laying out the infusion auxiliary materials, and eliminating the steps of resin mixing and infusion. Therefore, the quality of the main beam 120 molded by the wind turbine blade main beam manufacturing method of the embodiment of the present application is more stable and reliable, and the safety of the wind turbine blade is improved.

[0071] In some achievable ways, in the process of making the pultruded plate 10, the pultrusion die of the pultrusion device pultrudes the continuous fiber impregnated with resin to form a continuous pultruded plate 10. The pultruded plate 10 formed by the pultrusion die has a guide groove 10a. A thermoplastic resin body 20 is arranged on the continuous pultruded plate 10. The pultruded plate 10 with the guide groove 10a and the thermoplastic resin body 20 enters the traction machine and is led out. The pultruded plate 10 with the guide groove 10a and the thermoplastic resin body 20 is cut and wound to form a spare plate material roll. Subsequently, according to the size design requirements of the main beam 120, the plate material roll is unwound and cut to form a pultruded plate finished product 30 to constitute the main beam 120.

[0072] In some examples, an extrusion molding process is used to set the thermoplastic resin body 20 on at least one surface of the pultruded plate 10. The extrusion molding process can extrude a certain amount of resin to form the thermoplastic resin body 20, which is conducive to easily and accurately setting the thermoplastic resin body 20 formed by the pre-calculated certain amount of thermoplastic resin on the surface of the pultruded plate 10.

[0073] For example, Figure 6 The manufacturing process of the pultruded plate product 30 is schematically shown. Figure 6As shown, during the forming process of the pultruded board 10, the fiber yarn 200 passes through the resin dipping tank 210 to form a resin-impregnated fiber. The resin dipping tank 210 contains a thermosetting resin in a molten state. The melting point of the thermosetting resin in the embodiment of the present application is higher than that of the thermoplastic resin, so that when the thermoplastic resin is heated, the thermosetting resin will not melt. After passing through the guide plate, the impregnated fiber enters the pultrusion molding device 220 for pultrusion molding to form a continuous pultruded board 10. The thermoplastic resin is extruded using a resin extrusion molding device 230 to form a thermoplastic resin body 20. The thermoplastic resin body 20 is connected to the pultruded board 10. The traction device 240 pulls the pultruded board 10 with the thermoplastic resin body 20 and conveys the continuous pultruded board 10 to the cutting device 250. The cutting device 250 cuts the continuous pultruded board 10 to form a board section to be wound. The board section is then wound by a winder to form a board material roll. Subsequently, according to the size design requirements of the main beam 120 , the plate material roll is unrolled and cut for a second time to form a pultruded plate product 30 to constitute the main beam 120 .

[0074] In some achievable embodiments, thermosetting resins include, but are not limited to, unsaturated polyester resins, vinyl resins, and epoxy resins. Thermoplastic resins include, but are not limited to, polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polyethylene (PE), polyvinyl chloride (PVC), polystyrene (PS), polyamide (PA), polyoxymethylene (POM), polycarbonate (PC), and polyphenylene ether.

[0075] In some achievable ways, in the main beam mold 40, a plurality of pultruded plate products 30 are stacked to form the main beam intermediate body 50. Alternatively, after a plurality of pultruded plate products 30 are stacked to form the main beam intermediate body 50, the main beam intermediate body 50 is bound and fixed using a fiber mesh tape. Then, the main beam intermediate body 50 is hoisted as a whole into the main beam mold 40 using a hoisting tool.

[0076] In some achievable ways, Figure 7 The partial structure of the finished pultruded board 30 is schematically shown. Figure 7 As shown, at least one surface of the pultruded plate 10 is provided with a guide groove 10a and a thermoplastic resin body 20. The thermoplastic resin formed after the thermoplastic resin body 20 is heated and melted can easily flow into the adjacent guide groove 10a, and flow to different areas through the guide groove 10a to effectively infiltrate the pultruded plate 10 at different positions. The gas in the main beam intermediate body 50 can be quickly discharged to the external environment through the guide groove 10a under the extrusion of the thermoplastic resin, effectively reducing the possibility of bubbles appearing during the compression and curing process of the thermoplastic resin.

[0077] In some examples, the cross section of the pultruded plate 10 is rectangular. The pultruded plate 10 has four surfaces. The flow guide groove 10a and the thermoplastic resin body 20 are disposed on at least one of the four surfaces.

[0078] In some achievable ways, Figure 8 The partial structure of the finished pultruded board 30 is schematically shown. Figure 8 As shown, guide grooves 10a and thermoplastic resin bodies 20 are respectively arranged on different surfaces of the pultruded plate 10. The guide grooves 10a and the thermoplastic resin bodies 20 are dispersedly arranged at different positions of the pultruded plate 10. The thermoplastic resin formed after the thermoplastic resin body 20 is heated and melted and the thermoplastic resin guided to flow by the guide grooves 10a can simultaneously infiltrate the same pultruded plate 10 from different positions, which is conducive to improving the infiltration effect.

[0079] In some examples, the cross section of the pultruded plate 10 is rectangular. The pultruded plate 10 has four surfaces. Two opposite surfaces or two adjacent surfaces of the four surfaces are provided with guide grooves 10a and thermoplastic resin bodies 20, respectively.

[0080] In some achievable embodiments, the cross section of the pultruded plate 10 is rectangular. Along the thickness direction X of the pultruded plate 10 , guide grooves 10 a are provided on both the upper surface 11 and the lower surface 12 of the pultruded plate 10 .

[0081] Since the multi-layer pultruded plate product 30 is stacked along the thickness direction X of the pultruded plate 10, guide grooves 10a are provided on the upper surface 11 and the lower surface 12 of the pultruded plate 10, so that the gas can be quickly discharged to the external environment through the guide grooves 10a under the extrusion of the thermoplastic resin, effectively reducing the possibility of bubbles appearing during the compression and curing process of the thermoplastic resin.

[0082] In some achievable ways, Fig. 9 The partial structure of the main beam intermediate body 50 is schematically shown. Fig. 9 As shown, guide grooves 10a are provided on the upper and lower surfaces of the pultruded plate 10 along the thickness direction X of the pultruded plate 10. In other examples, in the main beam intermediate body 50, guide grooves 10a are provided on the surfaces corresponding to each other in any two adjacent pultruded plates 10.

[0083] In any two adjacent pultruded plates 10, guide grooves 10a are provided on the surfaces corresponding to each other, so that the guide grooves 10a at different positions can guide the flow of thermoplastic resin to ensure that the thermoplastic resin fully infiltrates each pultruded plate 10 and reduce the possibility of poor infiltration.

[0084] In some achievable embodiments, the thermoplastic resin body 20 includes at least one of a thermoplastic resin block and a thermoplastic resin strip. Fig.10 The partial structure of the finished pultruded board 30 is schematically shown. Fig.10 As shown, the thermoplastic resin body 20 includes a thermoplastic resin block. Exemplarily, the outer surface of the thermoplastic resin block can be a spherical surface or a cylindrical surface. Alternatively, Fig.11The partial structure of the finished pultruded board 30 is schematically shown. Fig.11 As shown, the thermoplastic resin body 20 includes a thermoplastic resin strip. Alternatively, the thermoplastic resin body 20 includes a thermoplastic resin block and a thermoplastic resin strip. Fig.10 As shown, the guide groove 10a can be a sink with one opening. Fig.11 As shown, the guide groove 10 a may be a through groove that penetrates two opposite surfaces of the pultruded plate 10 .

[0085] In some possible implementations, see Fig.11 As shown, among the multiple guide grooves 10a provided on at least one surface of the pultruded plate 10, each guide groove 10a is provided at intervals. Each guide groove 10a is dispersedly provided at different positions of the pultruded plate 10, so that on the one hand, each guide groove 10a can realize gas outlet at different positions of the pultruded plate 10, and quickly export the gas to the external environment through the guide groove 10a, effectively reducing the possibility of bubbles appearing during the compression and curing process of the thermoplastic resin; on the other hand, each guide groove 10a can realize resin drainage at different positions of the pultruded plate 10, which is beneficial to improve the infiltration effect and reduce the possibility of poor infiltration.

[0086] For some examples, see Fig.11 As shown, along the length direction Z of the pultruded plate 10, each guide groove 10a is arranged at intervals. The way of arranging the guide groove 10a along the length direction Z of the pultruded plate 10 makes the guide groove 10a have less influence on the rigidity of the main beam 120 after forming, which is conducive to reducing the possibility of deterioration of the mechanical properties of the main beam 120 due to the arrangement of multiple guide grooves 10a. Exemplarily, along the length direction Z of the pultruded plate 10, the spacing between two adjacent guide grooves 10a ranges from 500 millimeters (mm) to 1000 millimeters.

[0087] In some achievable ways, Fig.12 The partial structure of the finished pultruded board 30 is schematically shown. Fig.12 As shown, a plurality of guide grooves 10a arranged on at least one surface of the pultruded plate 10 are intersected to form a grid structure. The guide grooves 10a can be interconnected, so that the guide grooves 10a can be mutually connected to conduct gas to each other, so as to facilitate the rapid discharge of gas to the external environment, effectively reduce the possibility of bubbles appearing during the compression and curing process of the thermoplastic resin, and also facilitate the drainage of the resin to different positions, which is conducive to improving the infiltration effect and reducing the possibility of poor infiltration.

[0088] In some practicable embodiments, the inner surface of the guide groove 10a is an arc surface. The inner surface of the guide groove 10a has a smooth transition, so when the guide groove 10a is filled with thermoplastic resin, the thermoplastic resin can overcome the surface tension and easily fill the guide groove 10a, reducing the possibility of bubbles generated by poor filling of the thermoplastic resin in the guide groove 10a.

[0089] In some examples, the radius of the circle corresponding to the inner surface of the guide groove 10a ranges from 3 mm to 6 mm. For example, the radius of the circle corresponding to the inner surface of the guide groove 10a ranges from 5 mm. The width of the opening of the guide groove 10a can range from 2 mm to 3 mm.

[0090] In some examples, the depth of the guide groove 10a ranges from 1.5 mm to 2.5 mm. When the depth of the guide groove 10a is less than 1.5 mm, in the main beam intermediate 50 formed by stacking the pultruded board finished product 30, the cross-sectional area of ​​the guide groove 10a is relatively small, which reduces the exhaust capacity of the guide groove 10a and the resin drainage capacity. There is a possibility that the guide groove 10a is poorly vented or the resin does not fully fill the guide groove 10a and bubbles appear. When the depth of the guide groove 10a is greater than 2.5 mm, the depth of the guide groove 10a is too large, and there is a possibility of adversely affecting the structural strength of the pultruded board 10 itself. The method of taking the depth of the guide groove 10a in the range of 1.5 mm to 2.5 mm is conducive to reducing the possibility of the above-mentioned problems.

[0091] In some achievable embodiments, along the thickness direction X of the pultruded plate 10 , a plurality of guide grooves 10 a are disposed on the upper surface 11 of the pultruded plate 10 , and a plurality of thermoplastic resin bodies 20 are disposed on the lower surface 12 of the pultruded plate 10 .

[0092] A plurality of pultruded plate products 30 are stacked along the thickness direction X and the width direction Y of the pultruded plate 10 to form a main beam intermediate body 50. The thermoplastic resin body 20 is arranged on the lower surface 12 of the pultruded plate 10, so that the thermoplastic resin body 20 is arranged between the upper and lower layers of the pultruded plate 10. After the thermoplastic resin body 20 is heated and melted, the pultruded plate 10 located on the upper layer can squeeze the thermoplastic resin with fluidity below under the action of its own gravity, so that the thermoplastic resin can easily flow in all directions, thereby facilitating the flowing thermoplastic resin to infiltrate the gaps between the pultruded plates 10, improving the infiltration effect of the thermoplastic resin, and reducing the possibility of poor infiltration.

[0093] After the thermoplastic resin body 20 disposed on the upper pultruded plate 10 is heated and melted, the fluid thermoplastic resin can relatively easily enter the guide groove 10a on the lower pultruded plate 10 under the extrusion action of the upper pultruded plate 10, which is beneficial to improve the infiltration rate of the thermoplastic resin.

[0094] In the width direction Y of the pultruded plate 10, there may be a gap between two adjacent pultruded plates 10, that is, there is a gap between the left side of one pultruded plate 10 and the right side of another pultruded plate 10. After the thermoplastic resin body 20 between the two adjacent pultruded plates 10 is heated and melted, the flowing thermoplastic resin can fill the gap between the two adjacent pultruded plates 10, so as to ensure that the thermoplastic resin fully infiltrates each pultruded plate 10 and reduce the possibility of poor infiltration.

[0095] In some achievable ways, Fig.13 The partial structure of the main beam intermediate body 50 is schematically shown. Fig.13 As shown, an air-conducting fiber layer 70 is laid between any two adjacent layers of pultruded plate products 30. In the main beam intermediate body 50, each layer of pultruded plate products 30 and each air-conducting fiber layer 70 are alternately stacked. The air-conducting fiber layer 70 has good air-conducting performance. The melted thermoplastic resin of the thermoplastic resin body 20 can squeeze the gas between the pultruded plates 10 and guide it to the external environment through the air-conducting fiber layer 70 and the guide groove 10a, effectively reducing the possibility of bubbles appearing during the compression and curing process of the thermoplastic resin.

[0096] In some examples, the material of the air-conducting fiber layer 70 may include at least one of glass fiber and carbon fiber. The air-conducting fiber layer 70 laid between two adjacent layers of pultruded board products 30 may be dry yarn, that is, no thermoplastic resin material is disposed on the air-conducting fiber layer 70 .

[0097] In some examples, the air-conducting fiber layer 70 may be an integral layer structure. Along the width direction Y of the pultruded board 10 , the width of the air-conducting fiber layer 70 may be greater than, equal to, or less than the width of the entire pultruded board product 30 .

[0098] In some examples, a plurality of air-conducting fiber layers 70 are laid between two adjacent layers of the pultruded board product 30. The plurality of air-conducting fiber layers 70 may be spliced ​​with each other.

[0099] In some examples, in the main beam intermediate body 50, the thermoplastic resin body 20 is disposed on the lower surface 12 of the pultruded plate 10. The thermoplastic resin body 20 is disposed between the pultruded plate 10 located above the air-conducting fiber layer 70 and the air-conducting fiber layer 70, so that after the thermoplastic resin body 20 above the air-conducting fiber layer 70 is heated and melted, the flowing thermoplastic resin can infiltrate the air-conducting fiber layer 70 from top to bottom and flow in the air-conducting fiber layer 70, thereby effectively ensuring that the air-conducting fiber layer 70 obtains a good infiltration effect and reducing the possibility of poor infiltration.

[0100] In some achievable embodiments, along the thickness direction X of the pultruded board 10 , any two adjacent layers of the pultruded board products 30 are in direct contact with each other.

[0101] The melted thermoplastic resin of the thermoplastic resin body 20 can be connected as a whole. The melted thermoplastic resin of the thermoplastic resin body 20 squeezes the gas between the pultruded plates 10 and guides it to the external environment through the guide groove 10a. Therefore, in the process of forming the main beam intermediate body 50, it is no longer necessary to lay the gas guide fiber layer 70, thereby simplifying the process and saving materials.

[0102] In some achievable embodiments, among the multiple thermoplastic resin bodies 20 disposed on at least one surface of the pultruded plate 10, each thermoplastic resin body 20 is disposed at intervals. A space to be filled may be formed between any two adjacent thermoplastic resin bodies 20. After the thermoplastic resin bodies 20 are heated and melted, the flowing thermoplastic resin fills the space to be filled between each thermoplastic resin body 20, and the pultruded plate 10 may be effectively infiltrated.

[0103] In some examples, the thermoplastic resin body 20 includes at least one of a thermoplastic resin block and a thermoplastic resin strip. The thermoplastic resin body 20 includes a thermoplastic resin block. Alternatively, the thermoplastic resin body 20 includes a thermoplastic resin strip. Alternatively, the thermoplastic resin body 20 includes a thermoplastic resin block and a thermoplastic resin strip.

[0104] In some examples, the thermoplastic resin body 20 includes thermoplastic resin strips. The thermoplastic resin strips are arranged parallel to each other. Along the length direction Z of the pultruded board 10, the thermoplastic resin bodies 20 are arranged at intervals.

[0105] In some achievable ways, Fig.14 The partial structure of the finished pultruded board 30 is schematically shown. Fig.14 As shown, a plurality of thermoplastic resin bodies 20 disposed on at least one surface of the pultruded plate 10 are intersected with each other to form a grid-like structure.

[0106] The thermoplastic resin body 20 forms a grid-like structure so that after the thermoplastic resin body 20 is heated and melted, the flowing thermoplastic resin can flow in different directions and can be connected as a whole relatively quickly, which is beneficial to improving the infiltration rate.

[0107] In some examples, the thermoplastic resin body 20 includes a thermoplastic resin strip. Exemplarily, the angle between the thermoplastic resin strip and the length direction Z of the pultruded board 10 may be 45°.

[0108] In some achievable embodiments, the cross section of the pultruded plate 10 is rectangular, and the thermoplastic resin body 20 is disposed on both the upper surface 11 and the lower surface 12 of the pultruded plate 10 along the thickness direction X of the pultruded plate 10 .

[0109] Since the multi-layer pultruded plate product 30 is stacked along the thickness direction X of the pultruded plate 10, the thermoplastic resin body 20 is provided on both the upper surface 11 and the lower surface 12 of the pultruded plate 10, so that two layers of thermoplastic resin body 20 can be formed between the upper and lower layers of pultruded plates 10. After the thermoplastic resin body 20 is heated and melted, the pultruded plate 10 located on the upper layer can squeeze the thermoplastic resin with fluidity below under the action of its own gravity, so that the thermoplastic resin can easily flow in all directions, thereby facilitating the flowing thermoplastic resin to infiltrate the gaps between the pultruded plates 10, improving the infiltration effect of the thermoplastic resin, and reducing the possibility of poor infiltration.

[0110] In some achievable ways, Fig.15 The partial structure of the main beam intermediate body 50 is schematically shown. Fig.15 As shown, the cross section of the pultruded plate 10 is rectangular. In the main beam intermediate body 50, the thermoplastic resin body 20 is disposed on the surfaces corresponding to each other of any two adjacent pultruded plates 10.

[0111] In any two adjacent pultruded plates 10, the thermoplastic resin bodies 20 are arranged on the surfaces corresponding to each other, so that the thermoplastic resin bodies 20 at different positions can contact each other, so that after the thermoplastic resin bodies 20 at different positions are heated and melted, the flowing thermoplastic resins can be connected as a whole to ensure that the thermoplastic resin fully infiltrates each pultruded plate 10, thereby reducing the possibility of poor infiltration.

[0112] In some achievable methods, the height of the thermoplastic resin body 20 protruding from the surface of the pultruded board 10 ranges from 1.5 mm to 2.5 mm. When the height of the thermoplastic resin body 20 is less than 1.5 mm, in the main beam intermediate body 50 formed by stacking the pultruded board finished products 30, the gram weight of the thermoplastic resin body 20 is relatively small, so that the amount of thermoplastic resin formed after the thermoplastic resin body 20 is heated and melted is relatively small, and there is a possibility of poor infiltration of the pultruded board 10. When the height of the thermoplastic resin body 20 is greater than 2.5 mm, the height of the thermoplastic resin body 20 is relatively high, and there is a possibility that the gaps between the pultruded board finished products 30 after stacking are relatively large, resulting in poor infiltration of the pultruded board 10. The method in which the height of the thermoplastic resin body 20 ranges from 1.5 mm to 2.5 mm is conducive to reducing the possibility of the above-mentioned problems.

[0113] In some achievable ways, Fig.16 The local structure of the interface protection layer and the pultruded plate product 30 in the connected state is schematically shown. Fig.16 As shown, an interface protection layer 80 is respectively provided on the thermoplastic resin body 20 and the guide groove 10a of the pultruded plate product 30. The interface protection layer 80 is used to protect the thermoplastic resin body 20 or the guide groove 10a below. Before the pultruded plate product 30 is stacked and arranged in the main beam mold 40 to form the main beam intermediate body 50, the interface protection layer 80 is removed.

[0114] When the pultruded plate finished product 30 has not formed the main beam intermediate body 50, the pultruded plate finished product 30 needs to be transported and stacked for storage. When the pultruded plate finished product 30 is transported, the interface protection layer 80 can isolate the pultruded plate finished product 30 from the transport device, effectively reducing the possibility of friction or collision between the pultruded plate finished product 30 and the transport device, which may cause partial peeling of the thermoplastic resin body 20 or damage to the guide groove 10a. When the pultruded plate finished product 30 is stacked for storage, the interface protection layer 80 can isolate two adjacent pultruded plate finished products 30, effectively reducing the possibility of friction or collision between the two adjacent pultruded plate finished products 30, which may cause partial peeling of the thermoplastic resin body 20 or damage to the guide groove 10a.

[0115] If the thermoplastic resin body 20 or the guide groove 10a is contaminated, after the thermoplastic resin body 20 is melted, bubbles will be generated in the thermoplastic resin at the contaminant, or the contaminant will affect the fluidity of the thermoplastic resin and cause poor wetting. The interface protection layer 80 of the embodiment of the present application can protect the thermoplastic resin body 20 or the guide groove 10a below, effectively reducing the possibility of the thermoplastic resin body 20 or the guide groove 10a being contaminated with dust, fibers and other contaminants, so that the thermoplastic resin body 20 or the guide groove 10a can be kept clean, effectively solving the above technical problems.

[0116] In some examples, the interface protection layer 80 may be a release cloth or a plastic film.

[0117] In some achievable ways, Fig.17 The structural layout of the wind turbine blade main beam manufacturing method is schematically shown. Fig.17 As shown, an isolation film 300 and a first adhesive layer 310 are laid on the main beam mold 40. A main beam intermediate body 50 is formed on the first adhesive layer 310. A second adhesive layer 320 is laid on the main beam intermediate body 50. The first adhesive layer 310 and the second adhesive layer 320 cover the main beam intermediate body 50. A vacuum film 60 is laid on the second adhesive layer 320.

[0118] Before laying the isolation film 300 on the main beam mold 40, the surface of the main beam mold 40 is cleaned to remove dust, glue residue and other dirt on the surface of the main beam mold 40. Then, the isolation film 300 is laid on the main beam mold 40. The isolation film 300 can isolate the surface of the main beam mold 40, thereby protecting the surface of the main beam mold 40.

[0119] A first adhesive absorbing layer 310 is laid on the isolation film 300. The melted thermoplastic resin of the thermoplastic resin body 20 can flow to the bottom of the main beam intermediate body 50, and the first adhesive absorbing layer 310 can be used to absorb the thermoplastic resin overflowing from the bottom of the main beam intermediate body 50, so as to reduce the possibility of the bottom surface of the main beam intermediate body 50 being enriched with thermoplastic resin or the thermoplastic resin overflowing to form an unqualified bonding surface.

[0120] In some examples, the width of the first adhesive absorbing layer 310 may be greater than the width of the main beam intermediate body 50 . Along the thickness direction X of the pultruded plate 10 , the orthographic projection of the main beam intermediate body 50 is located within the orthographic projection of the first adhesive absorbing layer 310 .

[0121] In some examples, the first adhesive absorbing layer 310 may be an adhesive absorbing felt.

[0122] The second adhesive absorbing layer 320 can cover the main beam intermediate body 50. The second adhesive absorbing layer 320 can cover the top, left side and right side of the main beam intermediate body 50. The thermoplastic resin after the thermoplastic resin body 20 is melted has the possibility of overflowing from the top, left side and right side of the main beam intermediate body 50. The second adhesive absorbing layer 320 can be used to absorb the thermoplastic resin overflowing from the top, left side and right side of the main beam intermediate body 50, so as to reduce the possibility of the top, left side and right side of the main beam intermediate body 50 being enriched with thermoplastic resin or the thermoplastic resin overflowing to form an unqualified bonding surface.

[0123] In some examples, the second adhesive absorbing layer 320 may be an adhesive absorbing felt.

[0124] In some examples, an exhaust pipe 330 is provided between the edges of the first adhesive layer 310 and the second adhesive layer 320. The first adhesive layer 310 and the second adhesive layer 320 cover the exhaust pipe 330. The exhaust pipe 330 is connected to the exhaust port on the main beam mold 40. The vacuum device exhausts air through the exhaust pipe 330. After the value displayed by the vacuum device remains stable, the exhaust is stopped and the pressure is maintained, so as to provide environmental conditions that meet the requirements for the main beam intermediate body 50 to form the main beam. After the pressure maintenance is completed, the main beam mold 40 is heated. When the outer surface temperature of the main beam mold 40 is lower than 170 degrees Celsius (℃), the outer surface of the main beam mold 40 is covered with insulation cotton. When the outer surface temperature of the main beam mold 40 is higher than 200 degrees Celsius (℃), the insulation cotton is removed. The thermoplastic resin body 20 in the main beam intermediate body 50 is melted by heating. The melted thermoplastic resin of the thermoplastic resin body 20 fully infiltrates under the negative pressure environment to fill the gaps between the pultruded plates 10. The solidified thermoplastic resin can connect the pultruded plates 10 to form the main beam 120.

[0125] Fig.18 The process of manufacturing the main beam of a wind turbine blade is schematically shown. Fig.18As shown, the embodiment of the present application provides a method for manufacturing a main beam of a wind turbine blade, which comprises:

[0126] A pultruded plate product 30 is provided, the pultruded plate product 30 comprises a pultruded plate 10 and a thermoplastic resin body 20, a plurality of guide grooves 10a are provided on at least one surface of the pultruded plate 10, a plurality of thermoplastic resin bodies 20 are provided on at least one surface of the pultruded plate 10, and the pultruded plate 10 and the thermoplastic resin body 20 form an integral structure;

[0127] A main beam mold 40 is provided, in which a main beam intermediate body 50 formed by stacking a plurality of pultruded plate finished products 30 is arranged, the main beam intermediate body 50 includes a plurality of pultruded plate finished products 30, and each layer of pultruded plate finished products 30 includes a plurality of pultruded plate finished products 30;

[0128] Laying a vacuum membrane 60 on the main beam intermediate body 50;

[0129] Use a vacuum device to evacuate air so that the vacuum film 60 is under negative pressure;

[0130] A thermoplastic resin infusion material is provided and a thermoplastic resin body 20 is prepared. The thermoplastic resin infusion material is injected into the vacuum film 60. The thermoplastic resin infusion material and the thermoplastic resin body 20 are melted to form a thermoplastic resin that infiltrates the main beam intermediate body 50. The thermoplastic resin is cured to form the main beam 120.

[0131] The method for manufacturing the main beam of a wind turbine blade provided in an embodiment of the present application forms a pultruded plate product 30 by directly setting a thermoplastic resin body 20 on a pultruded plate 10. Then, a plurality of pultruded plate products 30 are stacked to form a main beam intermediate body 50. A plurality of pultruded plate products 30 are stacked along the thickness direction X and the width direction Y of the pultruded plate 10. Thermoplastic resin infusion material is poured into the main beam intermediate body 50 from the outside, and the main beam intermediate body 50 is heated to melt the thermoplastic resin body 20 in the main beam intermediate body 50. The externally poured thermoplastic resin and the thermoplastic resin after the thermoplastic resin body 20 is melted can simultaneously infiltrate the pultruded plate 10 under a negative pressure environment. The guide groove 10a can guide the gas existing between each pultruded plate product 30 or can guide the flow of the thermoplastic resin. The cured thermoplastic resin can connect each pultruded plate 10, so that each pultruded plate 10 and the cured thermoplastic resin together form a main beam 120. The method for manufacturing the main beam of a wind turbine blade in the embodiment of the present application uses an injection molding process and a thermoplastic resin body 20 to form the main beam 120. The externally injected thermoplastic resin and the thermoplastic resin after the thermoplastic resin body 20 melts and simultaneously infiltrates the pultruded plate 10, which can effectively reduce the possibility of poor infiltration or dry yarn caused by the injection molding process alone. Therefore, the quality of the main beam 120 formed by the method for manufacturing the main beam of a wind turbine blade in the embodiment of the present application is more stable and reliable, and the safety of the wind turbine blade is improved.

[0132] In some achievable embodiments, at least one surface of the pultruded plate 10 is provided with a guide groove 10a and a thermoplastic resin body 20. The thermoplastic resin injected externally and the thermoplastic resin after the thermoplastic resin body 20 is melted can also flow into the guide groove 10a at the same time. The gas in the main beam intermediate body 50 can be quickly discharged to the external environment through the guide groove 10a under the extrusion of the thermoplastic resin, effectively reducing the possibility of bubbles appearing during the compression and curing process of the thermoplastic resin.

[0133] In some achievable embodiments, an air-conducting fiber layer 70 is laid between any two adjacent layers of pultruded board products 30. The externally injected thermoplastic resin and the melted thermoplastic resin of the thermoplastic resin body 20 can simultaneously squeeze the gas between the pultruded boards 10 and guide the gas to the external environment through the air-conducting fiber layer 70 and the guide groove 10a.

[0134] In some achievable ways, along the thickness direction X of the pultruded plate 10, any two adjacent layers of the pultruded plate finished product 30 are in direct contact with each other. The externally injected thermoplastic resin and the thermoplastic resin after the thermoplastic resin body 20 is melted can be connected as a whole. The externally injected thermoplastic resin and the thermoplastic resin after the thermoplastic resin body 20 is melted squeeze the gas between the pultruded plates 10 and guide it to the external environment through the guide groove 10a. Therefore, in the process of forming the main beam intermediate body 50, it is no longer necessary to lay the gas guide fiber layer 70, so that the process can be simplified and materials can be saved.

[0135] The embodiment of the present application also provides a wind turbine blade, which includes a main beam 120 manufactured by the wind turbine blade main beam manufacturing method described above. The main beam 120 formed by the wind turbine blade main beam manufacturing method of the embodiment of the present application has more stable and reliable quality, thereby improving the safety of the wind turbine blade.

[0136] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for manufacturing a main beam of a wind turbine blade, characterized in that: include: A pultruded plate product is provided, wherein the pultruded plate product comprises a pultruded plate and a thermoplastic resin body, a plurality of guide grooves are arranged on at least one surface of the pultruded plate, a plurality of the thermoplastic resin bodies are arranged on at least one surface of the pultruded plate, and the pultruded plate and the thermoplastic resin body form an integral structure; Providing a main beam mold, in which a main beam intermediate body formed by stacking a plurality of the pultruded plate finished products is arranged, the main beam intermediate body comprises a plurality of layers of the pultruded plate finished products, and each layer of the pultruded plate finished products comprises a plurality of the pultruded plate finished products; Laying a vacuum film on the middle body of the main beam; Using a vacuum device to evacuate air so that the vacuum film has a negative pressure; The thermoplastic resin body is heated, and the thermoplastic resin formed after the thermoplastic resin body is melted infiltrates the main beam intermediate body, and the thermoplastic resin is cured to form the main beam.

2. The method for manufacturing a wind turbine blade main beam according to claim 1, characterized in that: The guide groove and the thermoplastic resin body are simultaneously disposed on at least one surface of the pultruded plate; or, the guide groove and the thermoplastic resin body are respectively disposed on different surfaces of the pultruded plate.

3. The method for manufacturing a wind turbine blade main beam according to claim 1, characterized in that: Among the multiple guide grooves arranged on at least one surface of the pultruded plate, the guide grooves are arranged at intervals; or, the multiple guide grooves arranged on at least one surface of the pultruded plate are crossed with each other to form a grid structure.

4. The method for manufacturing a wind turbine blade main beam according to claim 1, characterized in that: Among the plurality of guide grooves disposed on at least one surface of the pultruded plate, the guide grooves are disposed at intervals along the length direction of the pultruded plate.

5. The method for manufacturing a wind turbine blade main beam according to claim 1, characterized in that: The inner surface of the guide groove is an arc surface.

6. The method for manufacturing a wind turbine blade main beam according to claim 1, characterized in that: The depth of the guide groove ranges from 1.5 mm to 2.5 mm.

7. The method for manufacturing a wind turbine blade main beam according to claim 1, characterized in that: Along the thickness direction of the pultruded plate, a plurality of the thermoplastic resin bodies are arranged on the lower surface of the pultruded plate, and a plurality of the guide grooves are arranged on the upper surface of the pultruded plate.

8. The method for manufacturing a wind turbine blade main beam according to claim 1, characterized in that: An air-conducting fiber layer is laid between any two adjacent layers of the pultruded board product; or, along the thickness direction of the pultruded board, any two adjacent layers of the pultruded board product are in direct contact with each other.

9. The method for manufacturing a wind turbine blade main beam according to any one of claims 1 to 8, characterized in that: The cross-section of the pultruded plate is rectangular, and the guide grooves are provided on the upper and lower surfaces of the pultruded plate along the thickness direction of the pultruded plate; or, the cross-section of the pultruded plate is rectangular, and in the main beam intermediate body, the guide grooves are provided on the surfaces corresponding to each other in any two adjacent pultruded plates.

10. The method for manufacturing a wind turbine blade main beam according to any one of claims 1 to 8, characterized in that: The cross-section of the pultruded plate is rectangular, and the thermoplastic resin body is provided on both the upper surface and the lower surface of the pultruded plate along the thickness direction of the pultruded plate; or, the cross-section of the pultruded plate is rectangular, and in the main beam intermediate body, the thermoplastic resin body is provided on the surfaces corresponding to each other in any two adjacent pultruded plates.

11. The method for manufacturing a wind turbine blade main beam according to any one of claims 1 to 8, characterized in that: The height of the thermoplastic resin body protruding from the surface of the pultruded plate ranges from 1.5 mm to 2.5 mm.

12. The method for manufacturing a wind turbine blade main beam according to any one of claims 1 to 8, characterized in that: The thermoplastic resin body includes at least one of a thermoplastic resin block and a thermoplastic resin strip.

13. The method for manufacturing a wind turbine blade main beam according to any one of claims 1 to 8, characterized in that: An interface protective layer is respectively arranged on the thermoplastic resin body and the guide groove of the pultruded plate product, and the interface protective layer is removed before the pultruded plate product is stacked and arranged in the main beam mold to form the main beam intermediate.

14. The method for manufacturing a wind turbine blade main beam according to any one of claims 1 to 8, characterized in that: A thermoplastic resin infusion material is provided and the thermoplastic resin body is heated, the thermoplastic resin infusion material is injected into the vacuum film, the thermoplastic resin infusion material and the thermoplastic resin body are melted to form a thermoplastic resin that infiltrates the main beam intermediate body, and the thermoplastic resin is cured to form the main beam.

15. A wind turbine blade, characterized in that: It comprises a main beam manufactured by the method for manufacturing a main beam of a wind turbine blade as described in any one of claims 1 to 14.

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