A wind turbine blade web structure, method of manufacture and wind turbine blade

Abstract

The application provides a wind blade web structure, a manufacturing method and a wind blade. The wind blade web structure comprises a web support part and two web connecting parts. The web support part is arranged between the two web connecting parts and fixedly connected with the two web connecting parts. The web support part comprises a core material layer and a plurality of fiber tape layers covering opposite sides of the core material layer. The fiber tape layer comprises a first fiber tape composed of unidirectional fibers and thermoplastic resin or a second fiber tape composed of biaxial warp knitted fabric and thermoplastic resin. The wind blade web structure in the application can realize weight reduction of the web. The fiber tape layer adopts thermoplastic resin, which is recyclable, free of waste gas and solid waste emission, and green and environmentally friendly. The web structure is mainly formed by rolling, which is simple in process, does not need pouring, does not need a vacuum pouring mold, is low in investment cost, can be prefabricated in a factory, assembled on site, is high in flexibility, and is small in factory space occupation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, in particular to a wind blade web structure, a manufacturing method and a wind blade. BACKGROUND

[0002] Wind power is experiencing rapid development as a sustainable and green energy source, and wind blades are also developing towards large-scale, lightweight and high-power, with the update speed of wind blade airfoils becoming faster and faster and the iteration cycle of airfoils becoming shorter. At present, a web is usually arranged inside the wind blade to improve the structural strength and shear resistance of the wind blade. The web is usually made of glass steel material by laying double-axial glass fiber fabric and PVC core material on a web mold and then vacuum pouring with epoxy resin, vinyl resin or polyurethane.

[0003] The glass steel material web in the prior art is not recyclable, difficult to dispose after the expiration of the service life, heavy in weight and unable to meet the weight reduction requirement of the wind blade. Moreover, the web in the prior art needs to be produced by vacuum pouring, involving sealing, glue injection and demolding processes, which will generate solid waste such as demolding cloth, vacuum bag, sealing glue and glue injection pipe, and a vacuum pouring mold needs to be prepared, resulting in high investment cost and large factory space occupation. SUMMARY

[0004] To solve the above problems, a wind blade web structure, a manufacturing method and a wind blade are provided.

[0005] In a first aspect, the present application provides a wind blade web structure arranged inside a cavity of a wind blade, comprising a web support part and two web connecting parts; the web support part is arranged between the two web connecting parts and fixedly connected with the two web connecting parts respectively, and the web connecting part is used for connecting with a beam of the wind blade.

[0006] The web support part comprises a core material layer and a plurality of fiber tape layers covering opposite sides of the core material layer; the fiber tape layer comprises a first fiber tape composed of unidirectional fiber and thermoplastic resin or a second fiber tape composed of biaxial warp knitted fabric and thermoplastic resin.

[0007] The web support part comprises a plurality of support modules, and the plurality of support modules are connected by riveting or welding.

[0008] The web support part comprises a thermoplastic fiber reinforcing block arranged between adjacent two support modules, and the adjacent two support modules are fixedly connected with the thermoplastic fiber reinforcing block by welding or riveting process.

[0009] The web connecting part comprises a T-shaped structure or a π-shaped structure, and the material of the web connecting part is a unidirectional fiber or a combination of a unidirectional fiber and a biaxial warp fabric.

[0010] The web connecting part comprises a T-shaped structure or a π-shaped structure, and the material of the web connecting part is a combination of a short-cut fiber and a thermoplastic resin, and the web supporting part and the web connecting part are fixedly connected by one or more of structural adhesive bonding, rivet riveting, ultrasonic welding, and insertion;

[0011] The short-cut fiber comprises one or more of glass fiber, basalt fiber, aramid fiber, carbon fiber, and synthetic fiber, and the length of the short-cut fiber is 10mm-70mm.

[0012] The wind blade web structure further comprises a sleeve part, the sleeve part is embedded in both ends of the web supporting part, the web connecting part is provided with a buckle, the web supporting part and the two web connecting parts are fixedly connected by the buckle and the sleeve part.

[0013] The web connecting part comprises a multi-layer thermoplastic solid plate structure, and the thermoplastic solid plate structure is formed by rolling and pressing unidirectional fiber and thermoplastic resin strip material or biaxial warp fabric and thermoplastic resin strip material.

[0014] The wind blade web structure further comprises a plurality of corner fixing parts, and the web connecting part, the corner fixing part, and the web supporting part are fixedly connected by welding or riveting process.

[0015] The thermoplastic resin comprises one of PP, PET, PA6, PA66, ASA, PPO, PI, and PEEK; and / or,

[0016] The unidirectional fiber comprises one of glass fiber, basalt fiber, aramid fiber, carbon fiber, and synthetic fiber; and / or,

[0017] The laying angle of the biaxial fabric is ±45°-±80°, and the fabric area density is 400-1200g / m 2 ; and / or,

[0018] The core material comprises one of PVC foam board, PET foam board, MPP foam board, PP honeycomb board, and PP corrugated board.

[0019] The second aspect of the present application provides a wind blade, and the wind blade is provided with one or more wind blade web structures according to any one of the first aspect inside the cavity.

[0020] A third aspect of this application provides a method for manufacturing a wind turbine blade web structure, the method being used to manufacture the wind turbine blade web structure as described in any of the first aspects, the method comprising:

[0021] Provides two web plate connections;

[0022] Multi-layer fiber tape is formed by using unidirectional fibers and thermoplastic resin or biaxial warp-woven fabric and thermoplastic resin;

[0023] The fiber strip layers are laid on opposite sides of the core material layer to obtain the web support portion;

[0024] The two web plate connecting parts are respectively fixedly connected to the two ends of the web plate support to obtain the web plate structure of the wind turbine blade.

[0025] The multilayer fiber tape material, formed by unidirectional fibers and thermoplastic resin or biaxial warp-knitted fabric and thermoplastic resin, includes:

[0026] The fiber strip is made by extruding unidirectional fibers with thermoplastic resin or biaxial warp-knitted fabric with thermoplastic resin through a screw extruder, heating it through a special mold, re-extruding and impregnating it, and finally rolling it into a fiber strip layer through a rolling equipment; the thickness of the fiber strip layer ranges from 0.2 to 1.0 mm.

[0027] The step of laying fiber strip layers on opposite sides of the core material layer to obtain the web support portion includes:

[0028] Multiple layers of fiber tape are laid on each side of the core material layer to obtain a laminated structure, with adjacent fiber tape layers laid in a cross-layout pattern of 0° and 90°.

[0029] The web support portion is obtained by roll forming the laminated structure.

[0030] The step of roll forming the web support portion by the laminated structure includes:

[0031] The laminated structure is placed in a Teflon press for roll forming to obtain a sandwich profile intermediate. The forming temperature range is 180-220℃, the heating time range is 1.5-3.0 minutes, and the thickness of the sandwich profile intermediate is 20-80mm.

[0032] The step of roll forming the web support portion by the laminated structure further includes:

[0033] The sandwich profile intermediate body is cut and trimmed to obtain multiple support modules;

[0034] The web support is obtained by splicing and assembling multiple support modules.

[0035] Compared with the prior art, this application has the following advantages: The wind turbine blade web structure in this application adopts a sandwich structure with an outer fiber strip layer and an inner core material layer, which can reduce the weight of the web; the fiber strip layer is made of thermoplastic resin, which is recyclable, has no waste gas or solid waste emissions, and is green and environmentally friendly; the web structure is mainly formed by roll forming, which is simple in process, does not require injection, does not require vacuum injection molds, has low investment costs, and can be prefabricated in the factory and assembled on site, which is highly flexible and occupies little factory space. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the wind turbine blade web structure shown in the first embodiment.

[0038] Figure 2 This is a schematic diagram of the wind turbine blade web structure shown in the second embodiment.

[0039] Figure 3 This is a schematic diagram of the wind turbine blade web structure shown in the third embodiment.

[0040] Figure 4 This is a schematic diagram of the connection between the sleeve and the buckle in the third embodiment.

[0041] Figure 5 This is a schematic diagram of the wind turbine blade web structure shown in the fourth embodiment.

[0042] Figure 6 This is a schematic diagram showing the connection between the support module and the thermoplastic fiber reinforcing block in an embodiment.

[0043] Figure 7 This is a schematic diagram of the wind turbine blade web structure shown in the fifth embodiment.

[0044] Figure 8 This is a schematic diagram of the wind turbine blade web structure shown in the sixth embodiment.

[0045] Figure 9 This is a schematic diagram of the wind turbine blade web structure shown in the seventh embodiment.

[0046] Figure 10 This is a schematic diagram of the wind turbine blade web structure shown in the eighth embodiment. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0048] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] This application provides a wind turbine blade web structure, manufacturing method, and wind turbine blade. The wind turbine blade web structure is disposed inside the cavity of the wind turbine blade and includes a web support portion and two web connecting portions. The web support portion is disposed between the two web connecting portions and is fixedly connected to each of the two web connecting portions. The web connecting portions are used to connect to the beam cap of the wind turbine blade. The web support portion includes a core material layer and a multi-layer fiber strip layer covering opposite sides of the core material layer. The fiber strip layer includes a first fiber strip composed of unidirectional fibers and thermoplastic resin or a second fiber strip composed of biaxial warp-woven fabric and thermoplastic resin. The web support in this application adopts a sandwich structure with an outer fiber strip layer and an inner core material layer, which can reduce the weight of the web structure. The fiber strip layer is made of thermoplastic resin, which is recyclable, has no waste gas or solid waste emissions, and is green and environmentally friendly. The web structure is mainly formed by roll forming, which is simple in process, does not require injection, does not require vacuum injection molds, has low investment costs, and can be prefabricated in the factory and assembled on site, which is highly flexible and occupies little factory space.

[0050] The first aspect of this application, according to an exemplary first embodiment, is as follows: Figure 1 As shown, this application provides a wind turbine blade web structure 100, which is disposed inside the cavity of the wind turbine blade and includes a web support portion 110 and two web connecting portions 120. The web support portion 110 is disposed between the two web connecting portions 120 and is fixedly connected to each of the two web connecting portions 120. The web connecting portions 120 are bonded to the beam cap 200 of the wind turbine blade by structural adhesive 300.

[0051] In this embodiment, as Figure 1 As shown, the web support portion 110 includes a fiber strip layer 111 and a core material layer 112. Multiple fiber strip layers 111 cover opposite sides of the core material layer 112, forming a "sandwich" structure for the web support portion 110. The fiber strip layer 111 is either a first fiber strip composed of unidirectional fibers and thermoplastic resin, or a second fiber strip composed of biaxial warp-knitted fabric and thermoplastic resin. The first and second fiber strips are simply two selectable materials for the fiber strip layer 111, and there is no relative relationship between them.

[0052] The thermoplastic resins include one of the following: PP (polypropylene), PET (polyester resin), PA6 (nylon 6), PA66 (nylon 66), ASA (engineering plastic, a graft copolymer of acrylate rubber and acrylonitrile and styrene), PPO (polyphenylene oxide or polyphenylene ether), PI (polyimide), and PEEK (polyether ether ketone).

[0053] Unidirectional fibers are made from materials such as glass fiber, basalt fiber, aramid fiber, carbon fiber, and synthetic fiber.

[0054] The layup angle of the biaxial fabric is ±45° to ±80°, and the fabric areal density is 400 to 1200 g / m². 2 .

[0055] The core material includes one of the following: PVC (polyvinyl chloride) foam board, PET (polyester resin) foam board, MPP (microporous foamed polypropylene) foam board, PP (polypropylene) honeycomb board, and PP (polypropylene) corrugated board.

[0056] In this embodiment, as Figure 1 As shown, the web connection 120 has a T-shaped structure. The web connection 120 is made of unidirectional fiber or a combination of unidirectional fiber and biaxial warp-knitted fabric. It is formed by pultrusion molding and slitting and chamfering. The protruding part of the T-shaped structure is accommodated in the end space of the web support 110. The web support 110 and the web connection 120 are fixedly connected by structural adhesive or riveting to form the wind turbine blade web structure 100 to improve the structural strength and shear resistance of the wind turbine blade.

[0057] The structural adhesive has high bonding strength, can withstand large loads, and is resistant to aging, fatigue, and corrosion. It has stable performance within its expected lifespan and can be used to firmly bond wind turbine blades and the wind turbine blade web structure 100 in this application, as well as the web support 110 and the web connection 120.

[0058] In the wind turbine blade web structure of this application, the web support adopts a "sandwich" structure with an outer fiber strip layer and an inner core material layer, which is conducive to reducing the weight of the web. The fiber strip layer is made of thermoplastic resin, which is recyclable, has no waste gas or solid waste emissions, and is green and environmentally friendly.

[0059] like Figure 2 As shown, this is the wind turbine blade web structure shown in the second embodiment. The structure in the second embodiment is the same as that in the first embodiment and will not be described again. The difference is that in the second embodiment, the web connecting part 120 is a π-shaped structure. The two columns of the π-shaped structure extend into the end receiving space of the web support part 110. This structure has a stable connection, strong anti-torsion ability, and obvious weight reduction effect. The web connecting part 120 can be made into a standard part, which is convenient for installation and has good conformability.

[0060] In some other embodiments, the web plate connecting portion 120 can also be made of chopped fiber combined with thermoplastic resin, and formed by injection molding and chamfering. In this case, the web plate support portion 110 and the web plate connecting portion 120 can be fixedly connected by one or more of the following methods: structural adhesive bonding, riveting, ultrasonic welding, and insertion. The chopped fiber can be one or more mixed fibers selected from glass fiber, basalt fiber, aramid fiber, carbon fiber, and synthetic fiber, and the length of the chopped fiber is 10mm-70mm.

[0061] like Figure 3 As shown, this is the wind turbine blade web structure shown in the third embodiment. The structure in the third embodiment is the same as that in the first embodiment and will not be described again. The difference is that in the third embodiment, the web connection portion 120 is made of a combination of chopped fibers and thermoplastic resin; particularly in this embodiment, as... Figures 3 to 4 As shown, the wind turbine blade web structure 100 also includes a retaining sleeve 130, which is embedded in both ends of the web support portion 110. A buckle 121 is provided on the web connecting portion 120, and the web support portion 110 is fixedly connected to the two web connecting portions 120 by engaging with the retaining sleeve 130 through the buckle 121. This application does not limit the material of the retaining sleeve 130; it can be thermoplastic resin, thermosetting resin, or other materials that enable it to physically engage with the buckle 121.

[0062] In this embodiment, by pre-embedding sleeve portions 130 at both ends of the web support portion 110, the buckle 121 on the web connecting portion 120 forms a physical snap-fit ​​with the sleeve portion 130, so that the wind turbine blade web structure 100 forms a reliable and stable structure, further enhancing the shear resistance of the wind turbine blade.

[0063] like Figure 5As shown, this is the wind turbine blade web structure illustrated in the fourth embodiment. The structure in the fourth embodiment is the same as that in the first embodiment and will not be described again. The difference lies in that, in the fourth embodiment, the web connection portion 120 is a multi-layer thermoplastic solid plate structure. This thermoplastic solid plate structure is made by multi-layer roll pressing of unidirectional fibers and thermoplastic resin strips, or biaxial warp-woven fabric and thermoplastic resin strips. Specifically, it can be made by multi-layer roll pressing of 2-4 layers of unidirectional fibers and thermoplastic resin strips or biaxial warp-woven fabric and thermoplastic resin strips laid at 0° / 90° / 0° / 90°. In this embodiment, as... Figure 5 As shown, the wind turbine blade web structure 100 also includes multiple corner fixing parts 140, which are fixedly connected by hot air gun welding, ultrasonic welding or riveting process to form the wind turbine blade web structure 100.

[0064] In this embodiment, the web connecting part 120 is first extruded into a strip by a screw extruder, then rolled into a multi-layer thermoplastic solid plate structure, and finally sized and cut into web connecting parts 120. This process is simple, requires no molds, and is low-cost. In this embodiment, a corresponding number of corner fixing parts 140 are provided according to requirements to further enhance the structural strength of the wind turbine blade web structure 100. No restrictions are placed on the material of the corner fixing parts 140.

[0065] In some embodiments, the web support 110 is customized and cut into multiple different support modules 113 according to the wind turbine blade design requirements. These modules are then spliced ​​and assembled at the wind turbine blade manufacturing site. The support modules 113 are fixedly connected by riveting or ultrasonic welding to form a large web support 110.

[0066] Specifically, the connection method between two adjacent support modules 113 is as follows: Figure 6 As shown, the web support 110 includes multiple thermoplastic fiber reinforcing blocks 114. The thermoplastic fiber reinforcing blocks 114 are disposed between two adjacent support modules 113. The thermoplastic fiber reinforcing blocks 114 are made of unidirectional fiber and thermoplastic resin, and can be made of the same material as the fiber strip layer 111 during production to save costs. Figure 6 As shown, method (1) shows that the two adjacent support modules 113 are reinforced by welding thermoplastic fiber reinforcing blocks 114, and the two adjacent support modules 113 are firmly fixed by hot air welding or ultrasonic welding. Method (2) shows that the two adjacent support modules 113 are firmly fixed by riveting process. The thermoplastic fiber reinforcing blocks 114 in method (2) can be selected as reinforcing plates molded from double-layer or four-layer unidirectional fibers and thermoplastic resin strips.

[0067] Riveting is a cold riveting method that uses manual labor or compressed air as power and special tools to deform special rivets to rivet parts together. It is simple to operate, efficient, and provides good fixing strength.

[0068] By cutting the web support 110 into multiple support modules 113 and assembling them on-site, the space occupied in the production plant is saved, transportation costs are reduced, the applicability and flexibility of the wind turbine blade web structure are enhanced, and the production capacity per acre of the manufacturer is increased.

[0069] like Figure 7 As shown, this is the fifth embodiment of the wind turbine blade web structure. The structure in the fifth embodiment is the same as in the first embodiment and will not be described again. The difference is that in the fifth embodiment, two wind turbine blade web structures 100, as in the first embodiment, are provided inside the wind turbine blade cavity. With the development of larger and longer wind turbine blades, providing a single wind turbine blade web structure 100 is increasingly insufficient to meet development needs. Providing multiple wind turbine blade web structures according to requirements further improves the stability of wind turbine blade operation and provides a guarantee for the development of larger wind turbine blades.

[0070] like Figure 8 As shown, this is the wind turbine blade web structure shown in the sixth embodiment. The structure in the sixth embodiment is the same as that in the second embodiment and will not be described again. The difference is that in the sixth embodiment, two wind turbine blade web structures 100 as in the second embodiment are provided inside the wind turbine blade cavity.

[0071] like Figure 9 As shown, this is the wind turbine blade web structure shown in the seventh embodiment. The structure in the seventh embodiment is the same as that in the third embodiment and will not be described again. The difference is that in the seventh embodiment, two wind turbine blade web structures 100 as in the third embodiment are provided inside the wind turbine blade cavity.

[0072] like Figure 10 As shown, this is the wind turbine blade web structure shown in the eighth embodiment. The structure in the eighth embodiment is the same as that in the fourth embodiment and will not be described again. The difference is that in the eighth embodiment, two wind turbine blade web structures 100 as in the fourth embodiment are provided inside the wind turbine blade cavity.

[0073] A second aspect of this application provides a wind turbine blade, such as... Figure 1 and Figure 7As shown, according to actual needs, the cavity of the wind turbine blade is provided with one or more wind turbine blade web structures 100 as described in any of the first aspects. The web connecting part 120 in the wind turbine blade web structure 100 is bonded to the beam cap 200 of the wind turbine blade by structural adhesive 300. By setting the wind turbine blade web structure 100, the structural strength and shear resistance of the wind turbine blade are improved.

[0074] A third aspect of this application provides a method for manufacturing a wind turbine blade web structure, said method being used to manufacture a wind turbine blade web structure 100 as described in any of the first aspects. The manufacturing method includes:

[0075] Step 1) Provide two web plate connecting parts 120, the shape and material of which are as described in the first aspect.

[0076] Step 2) Unidirectional fibers and thermoplastic resin or biaxial warp-knitted fabric and thermoplastic resin are extruded through a screw extruder, heated through a special mold, re-extruded, and impregnated (the thermoplastic resin is the impregnation material and no other materials need to be added), and finally rolled into a fiber strip layer 111 by a rolling equipment; the thickness of the fiber strip layer is 0.2-1.0 mm.

[0077] Step 3) Lay multiple layers of fiber strip 111 on each side of the core material layer 112 to obtain a laminated structure. Adjacent fiber strip layers 111 are laid in a cross pattern of 0° and 90°. If the fiber strip layer 111 is made of biaxial warp braided fabric and thermoplastic resin, 2-4 layers can be laid directly according to the design requirements of the wind turbine blade.

[0078] Step 4) Place the laminated structure into a Teflon press for roll forming to obtain a sandwich profile intermediate. The forming temperature range is 180-220℃, the heating time range is 1.5-3.0 minutes, and the thickness of the sandwich profile intermediate is 20-80mm.

[0079] Step 5) The sandwich profile intermediate body is cut and trimmed on a cutting machine to obtain multiple support modules 113. The multiple support modules 113 are spliced ​​and assembled to obtain the web support part 110.

[0080] Step 6) Fix the two web plate connecting parts 120 to the two ends of the web plate support part 110 respectively to obtain the wind turbine blade web plate structure 100.

[0081] It should be noted that the specific temperature range of the molding temperature in the above steps can be determined according to the melting temperature of different thermoplastic resins selected; and this application does not limit the thickness of the sandwich profile intermediate body, but takes into account the actual design size requirements of the web support.

[0082] In summary, this application develops a spliced ​​thermoplastic wind turbine blade web structure. It involves roll forming and custom cutting into different support modules according to the wind turbine blade's design requirements, followed by on-site assembly. The support modules are directly assembled into web support sections via riveting or ultrasonic welding, thus forming a large wind turbine blade web structure. This wind turbine blade web structure achieves weight reduction in the web. The fiber strip layer uses thermoplastic resin, which is recyclable, produces no waste gas or solid waste, and is environmentally friendly. The web structure is primarily formed by roll forming, a simple process that requires no injection molding or vacuum injection molds, resulting in low investment costs, high assembly flexibility, and minimal factory space requirements.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A wind turbine blade web structure, characterized in that, The wind turbine blade web structure is disposed inside the cavity of the wind turbine blade. The wind turbine blade web structure includes a web support part and two web connecting parts. The web support part is disposed between the two web connecting parts and is fixedly connected to the two web connecting parts respectively. The web connecting parts are used to connect with the beam cap of the wind turbine blade. The web support includes a core material layer and a multi-layer fiber strip layer covering opposite sides of the core material layer; the fiber strip layer includes a first fiber strip composed of unidirectional fibers and thermoplastic resin or a second fiber strip composed of biaxial warp-woven fabric and thermoplastic resin. The wind turbine blade web structure also includes a sleeve portion, which is embedded in both ends of the web support portion. The web connecting portion is provided with a buckle, which engages with the sleeve portion to fix the web support portion to the two web connecting portions. The web support portion has a groove adapted to the sleeve portion. A limiting groove is provided at the opening of the groove. A protrusion is provided at one end of the sleeve portion near the opening. Two locking heads are provided at the end of the buckle that engages with the sleeve portion. The two locking heads are spaced apart. The length of the sleeve portion is less than the depth of the groove. The locking heads penetrate the sleeve portion and engage between the bottom of the sleeve portion and the bottom of the groove. The method for manufacturing the web support includes: laying multiple layers of fiber strips on each side of the core material layer to obtain a laminated structure, wherein adjacent fiber strips are laid in a cross pattern at 0° and 90°; placing the laminated structure into a Teflon press for roll forming to obtain a sandwich profile intermediate body; cutting and trimming the sandwich profile intermediate body to obtain multiple support modules; and assembling the multiple support modules to obtain the web support.

2. The wind turbine blade web structure according to claim 1, characterized in that, The web support includes multiple support modules, which are connected by riveting or welding.

3. The wind turbine blade web structure according to claim 2, characterized in that, The web support includes a thermoplastic fiber reinforcing block disposed between two adjacent support modules. Both adjacent support modules are fixedly connected to the thermoplastic fiber reinforcing block by welding or riveting.

4. The wind turbine blade web structure according to claim 1, characterized in that, The web plate connecting part includes a T-shaped structure or a π-shaped structure. The material of the web plate connecting part is unidirectional fiber or a combination of unidirectional fiber and biaxial warp-knitted material. The web plate support part and the web plate connecting part are fixedly connected by structural adhesive or rivet.

5. The wind turbine blade web structure according to claim 1, characterized in that, The web plate connecting part includes a T-shaped structure or a π-shaped structure. The web plate connecting part is made of a combination of chopped fiber and thermoplastic resin. The web plate support part and the web plate connecting part are fixedly connected by one or more of the following methods: structural adhesive bonding, riveting, ultrasonic welding, and insertion. The chopped fibers include one or more mixed fibers selected from glass fibers, basalt fibers, aramid fibers, carbon fibers, and synthetic fibers, and the length of the chopped fibers is 10mm-70mm.

6. The wind turbine blade web structure according to claim 1, characterized in that, The web plate connection includes a multi-layer thermoplastic solid plate structure, which is made of unidirectional fiber and thermoplastic resin strip, or by rolling and pressing biaxial warp braid and thermoplastic resin strip. The wind turbine blade web structure also includes multiple corner fixing parts, which are fixedly connected by welding or riveting processes to the web connecting parts, the corner fixing parts and the web support parts.

7. The wind turbine blade web structure according to any one of claims 1 to 6, characterized in that, The thermoplastic resin includes one of PP, PET, PA6, PA66, ASA, PPO, PI, and PEEK; and / or, The unidirectional fiber includes one of glass fiber, basalt fiber, aramid fiber, carbon fiber, and synthetic fiber; and / or, The layup angle of the biaxial fabric is ±45° to ±80°, and the fabric areal density is 400 to 1200 g / m². 2 ; and / or, The core material includes one of PVC foam board, PET foam board, MPP foam board, PP honeycomb board, and PP corrugated board.

8. A wind turbine blade, characterized in that, The wind turbine blade has one or more web structures as described in any one of claims 1 to 7 inside its cavity.

9. A method for manufacturing a wind turbine blade web structure, characterized in that, The method is used to manufacture the wind turbine blade web structure as described in any one of claims 1 to 7, the manufacturing method comprising: Provides two web plate connections; Multi-layer fiber tape is formed by using unidirectional fibers and thermoplastic resin or biaxial warp-woven fabric and thermoplastic resin; The fiber strip layers are laid on opposite sides of the core material layer to obtain the web support portion; The two web plate connecting parts are respectively fixedly connected to the two ends of the web plate support to obtain the web plate structure of the wind turbine blade.

10. The method for manufacturing the wind turbine blade web structure according to claim 9, characterized in that, A multilayer fiber tape is formed by using unidirectional fibers and thermoplastic resin or biaxial warp-knitted fabric and thermoplastic resin, including: The fiber strip is made by extruding unidirectional fibers with thermoplastic resin or biaxial warp-knitted fabric with thermoplastic resin through a screw extruder, heating it through a special mold, re-extruding and impregnating it, and finally rolling it into a fiber strip layer through a rolling equipment; the thickness of the fiber strip layer ranges from 0.2 to 1.0 mm.

11. The method for manufacturing the wind turbine blade web structure according to claim 9, characterized in that, The fiber strip layers are laid on opposite sides of the core material layer to obtain the web support portion, including: Multiple layers of fiber tape are laid on each side of the core material layer to obtain a laminated structure, with adjacent fiber tape layers laid in a cross-layout pattern of 0° and 90°. The web support portion is obtained by roll forming the laminated structure.

12. The method for manufacturing the wind turbine blade web structure according to claim 11, characterized in that, The process of roll forming the laminated structure to obtain the web support portion includes: The laminated structure is placed in a Teflon press for roll forming to obtain a sandwich profile intermediate. The forming temperature range is 180-220℃, the heating time range is 1.5-3.0 minutes, and the thickness of the sandwich profile intermediate is 20-80mm.

13. The method for manufacturing the wind turbine blade web structure according to claim 12, characterized in that, The process of roll forming the web support portion by the laminated structure further includes: The sandwich profile intermediate body is cut and trimmed to obtain multiple support modules; The web support is obtained by splicing and assembling multiple support modules.

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