Method of manufacturing a wind turbine blade and wind turbine blade
By maintaining a gap at the mold joint of wind turbine blades and using vacuum infusion technology, the problem of fiberglass delamination at the mold joint of wind turbine blades was solved, achieving a highly efficient manufacturing process and improved quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SINOMATECH WIND POWER BLADE
- Filing Date
- 2023-03-30
- Publication Date
- 2026-08-04
AI Technical Summary
Existing wind turbine blades are prone to fiberglass delamination at the leading and trailing edge seams of PS and SS surface skins, resulting in a complicated repair process that consumes a lot of manpower and material costs.
A certain gap is maintained at the joint between the blade root preform and the skin mold. The PS and SS skins of the blade are prevented from being subjected to resistance at the joint by laying up the raised part and using vacuum equipment. Vacuum injection of resin is used and cured to remove excess fiberglass. After mold closing, the shell is bonded together.
It effectively prevents fiberglass delamination, saves labor hours and material costs, and improves product quality and production efficiency.
Smart Images
Figure CN116442566B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of wind power generation technology, specifically relating to a method for preparing wind turbine blades and wind turbine blades. Background Technology
[0002] Wind power generation is one of the most promising new energy power generation technologies in the world today, and its large-scale research and development has become a key focus of new energy development in countries around the world in the 21st century. A wind turbine is a device that converts wind energy into mechanical work, which drives a rotor to rotate, ultimately outputting alternating current (AC) electricity. The principle of wind power generation is to use wind power to drive the wind turbine blades to rotate, and then use a speed increaser to increase the rotational speed, thereby causing the generator to produce electricity.
[0003] Currently, in the molding of large wind turbine blades, the shell is divided into the skin of the PS (leeward) side and the skin of the SS (windward) side, which need to be bonded together. After the blade is demolded, fiberglass delamination is prone to occur at the joints of the leading and trailing edges of both the PS and SS skins. This defect needs to be repaired later, and the entire repair process is quite complicated, consuming a lot of labor and material costs. Summary of the Invention
[0004] This invention provides a method for manufacturing wind turbine blades and a wind turbine blade to solve the technical problem that fiberglass delamination of fiberglass is prone to occur at the mold seams of the leading and trailing edges of the PS and SS skins after demolding of existing wind turbine blades.
[0005] The first aspect of this invention provides a method for manufacturing wind turbine blades, comprising the following steps:
[0006] Preparation of leaf root preforms;
[0007] The blade root preform is installed onto the skin mold; wherein, the blade root preform and the skin mold have a gap along a first direction at the mold closing seam; the first direction is the thickness direction of the blade root preform.
[0008] The blade layers are laid on the skin mold, resin is poured into the skin mold and cured to obtain the skin;
[0009] Remove excess fiberglass from the mold seam area of the skin;
[0010] The blade shell is obtained by combining the skin molds for the PS surface and the SS surface of the blade.
[0011] Remove the blade shell from the skin mold.
[0012] In some embodiments, the step of preparing the leaf root preform includes:
[0013] Filler material is laid at the position of the mold joint corresponding to the blade root preform mold to form a raised part, and the raised part becomes an integral part with the mold of the blade root preform.
[0014] Lay out the external auxiliary materials, body materials and internal auxiliary materials of the precast component, pour in resin and cure, clean the auxiliary materials and demold to obtain the leaf root precast component.
[0015] In some embodiments, the thickness H1 of the raised portion along the first direction satisfies: 1.5mm≤H1≤8mm;
[0016] The length L of the raised part along the second direction satisfies: 50mm≤L≤150mm; where the second direction is the direction in which the mold joint extends outward from the mold.
[0017] In some embodiments, the distance H2 between the PS-side skin mold and the SS-side skin mold at the mold closing seam position satisfies: 12mm≤H2≤20mm.
[0018] In some embodiments, the step of mounting the leaf root preform onto the skin mold further includes:
[0019] If the distance H2 between the skin mold of the PS surface of the blade and the skin mold of the SS surface of the blade at the mold closing seam satisfies: H2 < 12mm;
[0020] Then, grind the surfaces of the PS surface skin mold and the SS surface skin mold of the blade at the mold joint.
[0021] In some embodiments, the step of mounting the leaf root preform onto the skin mold includes:
[0022] Use clamps or support rods to fit the blade root preform onto the skin mold at the position corresponding to the mold seam.
[0023] Vacuum equipment is used to create a negative pressure in the sealed space between the blade root preform and the skin mold, so that the arc-shaped outer surface of the preform is tightly attached to the skin mold.
[0024] In some embodiments, the step of removing excess fiberglass from the skin at the mold joint location further includes:
[0025] Seal and vacuum the area between the skin and the skin mold, ensuring that the absolute pressure between the skin and the skin mold does not exceed 20 kPa.
[0026] In some embodiments, when the skin mold for the PS surface of the blade and the skin mold for the SS surface of the blade are closed, the distance H3 at the mold closing seam satisfies: 0.5mm≤H3≤10mm.
[0027] In some embodiments, the step of closing the PS-side skin mold and the SS-side skin mold to obtain the blade shell includes:
[0028] Apply adhesive to the bonding surfaces of the PS surface skin and the SS surface skin of the blade respectively;
[0029] The skin molds for the PS surface and SS surface of the blade are joined together to form the blade skin, which is then cured to obtain the blade shell.
[0030] A second aspect of the present invention provides a wind turbine blade, which is prepared by the preparation method of any of the above embodiments.
[0031] The wind turbine blade manufacturing method of the present invention maintains a certain gap between the blade root preform and the skin mold along the thickness direction of the blade root preform at the mold joint when the blade root preform is installed onto the skin mold. This prevents the blade root preform from being subjected to the resistance of the skin mold at the mold joint, thereby preventing the fiberglass delamination phenomenon from occurring at the leading and trailing edges of the PS and SS surface skins of the blade. This improves product quality stability while saving labor time and material costs. Attached Figure Description
[0032] Figure 1 A flowchart illustrating a method for manufacturing wind turbine blades according to some embodiments of the present invention;
[0033] Figure 2 This is a partial structural schematic diagram of a leaf root preform provided in some embodiments of the present invention;
[0034] Figure 3 This is a schematic diagram illustrating the assembly of the leaf root preform and the skin mold according to some embodiments of the present invention;
[0035] Figure 4 for Figure 3 A magnified view of a portion of the image;
[0036] Figure 5 This is a schematic diagram of the structure of the anodic membrane of the leaf root preform provided in some embodiments of the present invention;
[0037] Figure 6 This is a schematic diagram of the structure of the skin mold for the leaf root preform provided in some embodiments of the present invention;
[0038] Figure 7 A schematic diagram of the structure for grinding the skin mold of the leaf root preform provided in some embodiments of the present invention;
[0039] Figure 8 This is an assembly diagram of the leaf root preform and the skin mold provided in other embodiments of the present invention;
[0040] Figure 9 This is a schematic diagram of the structure of the skin and skin mold provided in some embodiments of the present invention;
[0041] Figure 10 This is a schematic diagram of the molded structure of the PS surface skin and the SS surface skin of the blade provided in some embodiments of the present invention.
[0042] The reference numerals are as follows: 10 for the leaf root preform; 11 for the arc portion; 12 for the edge portion; 20 for the skin mold; 21 for the skin mold of the PS surface; 22 for the skin mold of the SS surface; 23 for the polished portion; 30 for the skin; 31 for the skin of the PS surface; 32 for the skin of the SS surface; 33 for the excess portion; 40 for the mold of the leaf root preform; 41 for the raised portion; 50 for the mold seam; 61 for the clamp; 62 for the support rod; X for the first direction; Y for the second direction. Detailed Implementation
[0043] To make the inventive objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the embodiments described in this specification are merely illustrative of the invention and are not intended to limit the invention.
[0044] For simplicity, this paper only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an undefined range; and any lower limit can be combined with other lower limits to form an undefined range, just as any upper limit can be combined with any other upper limit to form an undefined range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of a range is included within that range. Therefore, each point or individual value can serve as its own lower or upper limit and be combined with any other point or individual value, or with other lower or upper limits, to form an undefined range.
[0045] In the description herein, it should be noted that, unless otherwise stated, "several" means one or more; "several (kinds)" means two or more; "above" and "below" include the stated number; the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this document.
[0046] The above description of the invention is not intended to describe every disclosed embodiment or implementation of the invention. Instead, the following description provides more specific examples of exemplary embodiments. Throughout this application, guidance is provided through a series of embodiments that can be used in various combinations. In each example, the examples are listed only as representative groups and should not be construed as exhaustive.
[0047] Currently, in the molding of large wind turbine blades, the shell is divided into the skin of the PS (leeward) side and the SS (frontward) side. The PS and SS skins need to be bonded together. The PS and SS skins are molded separately using skin molds. First, the blade root preform should be installed on the skin mold, and then the blade layup and other processes are performed to prepare the skin. Due to the inherent tolerances in the blade root preform during the manufacturing process, an interference fit may occur between the blade root preform and the skin mold at the mold joint when the blade root preform is installed on the skin mold. The skin mold exerts significant resistance on the blade root preform along its thickness direction. After demolding, fiberglass delamination is likely to occur at the leading and trailing edges of the mold joints of both the PS and SS skins. This defect needs to be repaired later, and the entire repair process is cumbersome, consuming a large amount of labor and material costs.
[0048] Figure 1 A flowchart illustrating a method for manufacturing wind turbine blades according to some embodiments of the present invention; Figure 2 This is a partial structural schematic diagram of a leaf root preform provided in some embodiments of the present invention; Figure 3 This is a schematic diagram illustrating the assembly of the leaf root preform and the skin mold according to some embodiments of the present invention; Figure 4 for Figure 3 A magnified view of a portion of the image.
[0049] Please refer to the following: Figures 1-4 The first aspect of this invention provides a method for manufacturing wind turbine blades, comprising the following steps:
[0050] S10. Prepare leaf root preforms.
[0051] Wind turbine blades are mainly divided into two parts: the blade root and the blade body. The root region of the wind turbine blade connects to the hub of the wind turbine and bears the load transmitted from the entire blade. To ensure reliability and durability, the root design requires a large number of layers of fiberglass cloth. The wind turbine blade root is mainly manufactured using blade root prefabrication technology, with the blade root prefabrication components 10 for the PS surface and SS surface of the blade manufactured separately.
[0052] S20. Install the blade root preform onto the skin mold; wherein the blade root preform and the skin mold have a gap along a first direction at the mold closing seam; the first direction is the thickness direction of the blade root preform.
[0053] The blade root preform 10 includes an arc portion 11 and an edge portion 12. The edge portion 12 extends outward relative to the arc portion 11, which can raise the position of the edge portion 12 relative to the arc portion 11. A mold closing seam 50 is formed between the edge portion 12 of the blade root preform 10 on the PS surface and the edge portion 12 of the blade root preform 10 on the SS surface, so that the blade root preform 10 and the skin mold 20 have a gap D along the first direction X at the position of the mold closing seam 50.
[0054] There are several methods for raising the edge portion 12 of the blade root preform 10. For example, the blade root preform mold can be made separately, and the mold can be processed according to the model after the mold seam 50 of the skin mold 20 is raised. Then the blade root preform mold 10 can be produced. The blade root preform 10 with the edge portion 12 raised at the mold seam 50 position can be obtained by using the blade root preform mold 10.
[0055] Figure 5 This is a schematic diagram of the structure of the anodic membrane of the leaf root preform provided in some embodiments of the present invention. In this embodiment, as... Figure 5 As shown, after the blade root preform 10 mold and the skin mold 20 are made using the same positive mold, the area where the flange platform of the blade root preform 10 mold needs to be raised is covered with an appropriate number of layers of fiberglass fabric, so that the flange platform of the final blade root preform 10 mold is higher than that of the skin mold 20.
[0056] S30. Lay the blade layers on the skin mold, pour resin into the skin mold and cure it to obtain the skin.
[0057] The PS-side skin 31 and the SS-side skin 32 are fabricated separately. Therefore, the outer skin 30, outer reinforcing layer, core material, inner reinforcing layer, thickening layer, inner skin 30, and vacuum auxiliary material are laid in the PS-side skin mold 21 and the SS-side skin mold 22, respectively. Resin is poured into the two molds and heated to cure, resulting in the molded PS-side skin 31 and SS-side skin 32.
[0058] S40. Remove excess fiberglass from the mold seam area.
[0059] Figure 9 The diagram illustrates the structure of the skin and skin mold provided in some embodiments of the present invention. Figure 9 As shown, the skin 31 of the PS surface protrudes towards the mold joint 50 on the side facing the skin 32 of the SS surface at the mold joint 50. The skin 32 of the SS surface protrudes towards the mold joint 50 on the side facing the skin 31 of the PS surface at the mold joint 50. In order to ensure that the skin 30 is subjected to resistance at the mold joint 50 during mold closing, a portion of the protruding part (excess part 33) is ground off, so that after mold closing, there is a certain gap between the skin 31 of the PS surface and the skin 32 of the SS surface at the mold joint 50.
[0060] S50. Combine the skin molds for the PS surface and SS surface of the blade to obtain the blade shell.
[0061] S60. Demold the blade shell and remove it from the skin mold.
[0062] In the above scheme, the wind turbine blade manufacturing method maintains a certain gap between the blade root preform 10 and the skin mold 20 at the mold joint 50 along the thickness direction of the blade root preform 10 when the blade root preform 10 is installed onto the skin mold 20. This prevents the blade root preform 10 from being subjected to the resistance of the skin mold 20 at the mold joint 50, thereby preventing the fiberglass delamination phenomenon of the fiberglass at the leading and trailing edges of the PS surface skin 30 and the SS surface skin 30 of the blade, saving labor time and material costs.
[0063] Figure 5 This is a schematic diagram of the anodic membrane structure of the leaf root preform provided in some embodiments of the present invention. For example... Figure 5 As shown, the steps for preparing the leaf root preform 10 include:
[0064] S11. Filler material is laid at the position of the mold 40 of the blade root preform corresponding to the mold seam 50 to form a raised part 41, and the raised part 41 is integrated with the mold 40 of the blade root preform.
[0065] After the leaf root preform 10 mold is made using the same positive mold as the main mold, the area where the flange of the leaf root preform 10 mold needs to be raised is filled with an appropriate number of layers of filler so that the flange of the leaf root preform 10 mold is more than 1.5mm higher than the flange of the main mold. The fabric is formed by hand lay-up or vacuum casting process, or by filling and thickening treatment such as adhesive. After molding, the surface is smoothed.
[0066] S12. Lay out the external auxiliary materials, body materials and internal auxiliary materials of the precast component, pour in resin and cure, clean the auxiliary materials and demold to obtain the leaf root precast component 10.
[0067] In the above scheme, by laying multiple layers of glass fiber fabric at the position of the mold 40 of the blade root preform corresponding to the mold seam 50, the edge portion 12 of the prepared blade root preform 10 is raised relative to the arc portion 11, thus achieving a gap D between the blade root preform 10 and the skin mold 20 at the position of the mold seam 50 along the first direction X. Furthermore, the above method is simple, eliminates the need to re-prepare the mold 40 for the blade root preform, reduces costs, and improves preparation efficiency.
[0068] In some embodiments, the thickness H1 of the raised portion 41 along the first direction X satisfies: 1.5mm ≤ H1 ≤ 8mm. If the thickness H1 of the raised portion 41 along the first direction X is too small, it may cause the blade root preform 10 and the skin mold 20 to fail to form a gap along the first direction X at the mold closing seam 50. If the thickness H1 of the raised portion 41 along the second direction Y is too large, it may cause the PS surface skin 31 of the blade root preform 10 to interfere with the SS surface skin mold 22, or the SS surface skin 32 to interfere with the PS surface skin mold 21, still subject to resistance at the mold closing seam 50, resulting in the phenomenon of glass fiber delamination.
[0069] The length L of the raised portion 41 along the second direction Y satisfies: 50mm ≤ L ≤ 150mm; where the second direction Y is the direction in which the mold seam 50 extends outward from the mold. The first direction X and the second direction Y can be perpendicular to each other. Since the edge portion 12 of the blade root preform 10 protrudes away from the arc portion 11, it can be fitted onto the edge of the skin mold 20, extending the raised portion 41 on the blade root preform 10 outward from the mold seam 50. This ensures that the entire edge portion 12 of the blade root preform 10 has a certain gap with the skin mold 20 in all directions, and the blade root preform 10 will not be subjected to the resistance of the skin mold 20 in any direction, further preventing the phenomenon of glass fiber delamination in the skin 30.
[0070] Figure 6 This is a schematic diagram of the structure of the skin mold for the leaf root preform provided in some embodiments of the present invention.
[0071] like Figure 6 As shown, in some embodiments, the distance H2 between the blade PS surface skin mold 21 and the blade SS surface skin mold 22 at the mold closing seam 50 satisfies: 12mm ≤ H2 ≤ 20mm. This can accommodate the blade root preform 10 after the mold closing seam 50 position is raised, preventing interference between the blade root preform 10 on the blade PS surface and the blade SS surface skin mold 22, or between the blade root preform 10 on the blade SS surface and the blade PS surface skin mold 21.
[0072] Figure 7 This is a schematic diagram of the structure for grinding the skin mold of the leaf root preform provided in some embodiments of the present invention.
[0073] like Figure 7As shown, in some embodiments, before the step of installing the blade root preform 10 onto the skin mold 20, the method further includes: if the distance H2 between the skin mold 21 of the blade PS surface and the skin mold 22 of the blade SS surface at the mold joint 50 satisfies: H2 < 12 mm, then the surfaces of the skin mold 21 of the blade PS surface and the skin mold 22 of the blade SS surface at the mold joint 50 are ground respectively. The skin mold 21 of the blade PS surface and the skin mold 22 of the blade SS surface can be ground to the same height at the mold joint 50. After removing the ground portion 23, the distance between the skin mold 21 of the blade PS surface and the skin mold 22 of the blade SS surface at the mold joint 50 becomes larger, and the distance H2 between the skin mold 21 of the PS surface and the skin mold 22 of the SS surface at the mold joint 50 satisfies: 12 mm ≤ H2 ≤ 20 mm.
[0074] In other embodiments, when designing the mold for the wind turbine blade, the gap of the mold joint 50 in the area of the blade root preform 10 can be designed to be 12mm~20mm, and the anodizing process can be performed accordingly. Then, the mold can be used to produce the skin mold 20 of the wind turbine blade, so that the distance H2 between the PS surface skin mold 21 and the SS surface skin mold 22 at the position of the mold joint 50 can satisfy: 12mm≤H2≤20mm.
[0075] Figure 3 This is a schematic diagram illustrating the assembly of the leaf root preform and the skin mold according to some embodiments of the present invention; Figure 8 This is an assembly diagram of the leaf root preform and the skin mold provided in some other embodiments of the present invention.
[0076] Please refer to the following: Figure 3 and Figure 8 In some embodiments, the step of mounting the leaf root preform 10 onto the skin mold 20 includes:
[0077] S21. Use clamp 61 or support rod 62 to fit the blade root preform 10 onto the skin mold 20 at the position corresponding to the mold seam 50.
[0078] like Figure 3 As shown, when using clamps 61, one clamp 61 is attached to each end of the blade root preform 10. One end of each clamp 61 is connected to the blade root preform 10, and the other end is connected to the skin mold 20. The clamps 61 can push the blade root preform 10 outward to prevent the protrusion of the edge 12 from interfering with the skin mold 20 when the blade root preform 10 is installed due to shrinkage, thus preventing the blade root preform 10 from being unable to be fitted onto the skin mold 20.
[0079] Similarly, such as Figure 8As shown, if a support rod 62 is used, both ends of the support rod 62 can be abutted against the edge portions 12 at both ends of the arc portion 11 to push the blade root preform 10 outward. This prevents the blade root preform 10 from shrinking and causing the protrusion of the edge portion 12 to interfere with the skin mold 20 when installing the blade root preform 10, which would result in the inability to fit the blade root preform 10 onto the skin mold 20.
[0080] S22. A vacuum device is used to draw the sealed space between the leaf root preform 10 and the skin mold 20 into a negative pressure state so that the arc-shaped outer surface of the preform is tightly attached to the skin mold 20.
[0081] Negative pressure helps the blade root preform 10 fit better with the skin mold 20, preventing skin wrinkles and ensuring blade quality and performance. Using vacuum equipment to create a negative pressure environment in the sealed space simplifies the manufacturing process and reduces production costs.
[0082] In some embodiments, blade layers are laid on the skin mold 20. After the blade layup is completed, the surface of the skin mold is sealed with a vacuum and air is evacuated, creating a vacuum inside the skin mold with an absolute pressure below 4 kPa. At this time, the original skin mold and the blade root preform are also sealed by a greater negative pressure, with an internal absolute pressure below 4 kPa. When injecting resin into the skin mold 20, if no measures are taken, air bubbles may be generated during the filling process. These air bubbles can cause unevenness on the blade surface and may even damage the strength and stiffness of the blade, thus affecting its performance and lifespan. By maintaining a negative pressure state during resin injection, the gas inside the mold can be extracted, thereby avoiding the generation of air bubbles. At the same time, the negative pressure state can help the resin penetrate better into the blade layup, thereby improving the quality and performance of the blade.
[0083] Figure 10 This is a schematic diagram of the molded structure of the PS surface skin and the SS surface skin provided in some embodiments of the present invention.
[0084] like Figure 10 As shown, in some embodiments, when the PS surface skin mold 21 and the SS surface skin mold 22 are closed, the distance H3 at the mold closing seam 50 satisfies: 0.5mm≤H3≤10mm, which can prevent the PS surface skin mold 21 from interfering with the SS surface skin 32 at the mold closing seam 50, and prevent the SS surface skin mold 22 from interfering with the PS surface skin 31 at the mold closing seam 50.
[0085] In some embodiments, the step of closing the PS-surface skin mold 21 and the SS-surface skin mold 22 to obtain the blade shell includes:
[0086] S51. Seal and evacuate the vacuum between the PS surface skin mold 21 and the skin 31, and seal and evacuate the vacuum between the SS surface skin mold 22 and the skin 32. The absolute pressure between the skin 31 and the skin mold 21 shall not exceed 20 kPa, so that the skin 31 and the skin mold 21 are tightly attached together and will not delaminate due to skin shrinkage, thereby preventing anti-molding between the PS surface skin 31 and the SS surface skin 32 of the blade.
[0087] S52. Apply adhesive to the bonding surfaces of the blade skin 31 on the PS side and the blade skin 32 on the SS side respectively.
[0088] S53. The PS surface skin mold 21 and the SS surface skin mold 22 are joined together with the skin 30 to form a film, so that the blade skin 32 is bonded together and cured to obtain the blade shell.
[0089] The mold-closing process in this embodiment is simple, which can reduce costs and improve production efficiency.
[0090] A second aspect of the present invention provides a wind turbine blade, which is prepared by the preparation method of any of the above embodiments.
[0091] A second aspect of the present invention provides a wind turbine blade, which is prepared using the preparation method of any of the above embodiments. Since this wind turbine blade employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.
[0092] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A method of manufacturing a wind turbine blade, c h a r a c t e r i s e d in that Includes the following steps: Preparation of leaf root preforms; The blade root preform is installed onto the skin mold; wherein, the blade root preform and the skin mold have a gap along a first direction at the mold joint; the first direction is the thickness direction of the blade root preform; A layer of blades is laid on a skin mold, resin is poured into the skin mold and cured to obtain a skin. Remove excess fiberglass from the skin at the mold joint; The blade shell is obtained by combining the skin molds for the PS surface and the SS surface of the blade. Demold the blade shell and separate it from the skin mold; The steps for preparing the leaf root preform include: Lay out the external auxiliary materials, body material and internal auxiliary materials of the precast component, pour resin and cure it, clean the auxiliary materials and demold to obtain the leaf root precast component; When the skin molds for the PS surface of the blade and the SS surface of the blade are closed, the distance H3 at the mold closing seam satisfies: 0.5mm≤H3≤10mm.
2. A method of manufacturing a wind turbine blade according to claim 1, wherein Prior to the step of laying the external auxiliary materials, body materials and internal auxiliary materials of the precast component, the following are included: Filler is laid at the position of the mold corresponding to the mold joint of the blade root preform to form a raised part, and the raised part is integrated with the mold of the blade root preform.
3. The method for manufacturing wind turbine blades according to claim 2, characterized in that, The thickness H1 of the raised portion along the first direction satisfies: 1.5mm≤H1≤8mm; The length L of the raised portion along the second direction satisfies: 50mm≤L≤150mm; wherein, the second direction is the direction in which the mold seam extends outward from the mold.
4. A method of manufacturing a wind turbine blade according to claim 1, characterised in that The distance H2 between the skin mold of the PS surface of the blade and the skin mold of the SS surface of the blade at the position of the mold joint satisfies: 12mm≤H2≤20mm.
5. A method of manufacturing a wind turbine blade according to claim 4, wherein Prior to the step of installing the blade root preform onto the skin mold, the following also includes: If the distance H2 between the skin mold of the PS surface of the blade and the skin mold of the SS surface of the blade at the position of the mold joint satisfies: H2 < 12 mm; Then, the surfaces of the PS surface skin mold and the SS surface skin mold of the blade are polished at the location of the mold joint.
6. A method of manufacturing a wind turbine blade according to claim 1, characterised in that The step of installing the leaf root preform onto the skin mold includes: Use a clamp or support rod to fit the leaf root preform onto the skin mold at the position corresponding to the mold seam. A vacuum device is used to create a negative pressure in the sealed space between the leaf root preform and the skin mold, so that the arc-shaped outer surface of the preform is tightly attached to the skin mold.
7. A method of manufacturing a wind turbine blade according to claim 6, wherein Prior to the step of removing excess fiberglass from the skin at the mold seam, the following steps are also included: The skin and the skin mold are sealed and a vacuum is drawn, ensuring that the absolute pressure between the skin and the skin mold does not exceed 20 kPa.
8. A method of manufacturing a wind turbine blade according to claim 1, characterised in that The step of joining the skin molds for the PS surface and the SS surface of the blade to obtain the blade shell includes: Apply adhesive to the bonding surfaces of the skin on the PS side of the blade and the skin on the SS side of the blade, respectively; The skin molds for the PS surface and SS surface of the blade are joined together with the skin mold to bond the blade skins together and then solidify to obtain the blade shell.
9. A wind turbine blade, characterised in that The preparation method according to any one of claims 1-8 is used to prepare.