A method for connecting a bonded flange of a wind turbine blade
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAMEN SUNRUI WIND POWER TECHNOLOGY CO LTD
- Filing Date
- 2023-10-26
- Publication Date
- 2026-06-05
Smart Images
Figure CN117183410B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of wind power manufacturing technology, and more specifically, to a connection method for adhesive flanges on wind turbine blades. Background Technology
[0002] Wind turbine blades are the core components of wind power generation systems. In recent years, wind turbine blades have gradually developed towards larger sizes and lighter weights. The longest blade in my country has reached 126 meters. In this rapid development, low cost and high reliability have become key to design and manufacturing, and are also important guarantees for the stable operation of the unit and the continuous supply of electricity. The structure of a conventional wind turbine blade generally consists of a main beam, trailing edge beam, web, windward shell (PS surface), and leeward shell (SS surface). The main beam and trailing edge beam are usually prefabricated and then cast together with the blade shell. The web is bonded to the main beam area using structural adhesive. The PS and SS surfaces of the shell are bonded together with adhesive flanges using structural adhesive to complete the final blade. The entire blade manufacturing process is completed through subsequent processes. Therefore, the production of high-quality leading and trailing edge adhesive flanges is very important.
[0003] In the existing process, the front and rear edge bonding flange fabric layers rely on the bonding flange mold to position the fabric layers, and are laid and cast together with the shell fabric layers. This molding process has the following disadvantages: (1) Since the bonding flange mold is segmented, wrinkles and steps are likely to appear at the mold joint of the bonding flange. The fabric layers of the bonding flange are easily drawn to the edge of the main mold flange by vacuum, resulting in defects such as auxiliary material inclusion and twisting of the bonding flange fabric layers; (2) The operable space gradually decreases from the blade root to the middle of the blade at the trailing edge. The arc of the trailing edge bonding flange mold is too large, making it difficult to adjust the fabric layers and making it difficult to... The mold fits tightly, wasting a lot of time; (3) In the area of the blade trailing edge where the trailing edge gap is less than 5cm, manual operation is difficult and it is impossible to lay a layer on the bonding flange mold. In this area, fiberglass cloth is used to wrap the socket foam core material and pad it on the trailing edge to reduce the trailing edge bonding gap and improve the bonding reliability. However, the wrapping cloth is easily drawn onto the main mold flange during vacuuming, forming wrinkles that are not easy to identify. The subsequent cutting process will cut this part of the wrapping cloth. Therefore, it is of great significance to study how to optimize the structure of the bonding flange to improve the quality of the bonding flange.
[0004] Patent CN105346106B mentions a method and mold for integrally molding the external reinforcement and shell of a wind turbine blade. The mold includes a lower shell mold and an upper shell mold. The lower shell mold includes a lower shell mold body, a trailing edge external reinforcement flange mold, a leading edge inner bonding flange mold, and a leading edge detachable mold. The lower shell mold body has an arc surface consistent with the shape of the outer wall of the wind turbine blade. The blade mold closing method is to bond a web plate to the formed lower shell of the blade, and apply structural adhesive to the web plate bonding flange, the leading edge inner bonding flange of the lower shell of the blade, and the trailing edge external reinforcement flange. Apply structural adhesive to the leading edge external reinforcement flange and the trailing edge inner bonding flange of the formed upper shell of the blade. By mechanically flipping the upper shell mold, the bonding and molding of the upper shell and the lower shell of the blade are completed and cured. This can improve the efficiency of blade post-processing to a certain extent. However, since the bonding flange is still a multi-segment structure, it is prone to problems such as joint wrinkles and steps.
[0005] Patent CN108621449A discloses a wind turbine blade bonding angle mold and its manufacturing method. The wind turbine blade bonding angle mold includes a conformal part, an bonding part, and a placement part. The specific manufacturing method of the bonding mold is as follows: S1: A fiber cloth layer is laid on the flange boss and flange platform on the leeward side of the wind turbine blade to form a lower structural layer; and a fiber cloth layer is laid on the inner surface of the windward side of the inverted wind turbine blade, the flange boss, and the flange platform to form an upper structural layer; S2: A fiber cloth layer is laid on the portion of the lower structural layer located on the leeward side of the flange boss and the upper structural layer... S3: Apply structural adhesive to the flange boss on the windward side of the structural layer; S4: Close the windward and leeward sides to bond the flange boss on the leeward side of the lower structural layer to the flange boss on the windward side of the upper structural layer; S5: Remove the bonded lower and upper structural layers from the wind turbine blade and trim and polish them; This method can improve the service life of the blade bonding angle to a certain extent and reduce costs, but the manufacturing structure of its bonding device is complex and the manufacturing steps are cumbersome, resulting in a poor effect on improving the manufacturing efficiency of the blade bonding flange. Summary of the Invention
[0006] In view of this, the present invention aims to propose a connection method for adhesive flanges on wind turbine blades, in order to solve the problems in the prior art where defects easily occur when the adhesive flanges at the leading and trailing edges of the blade are drawn onto the main mold flange, such as wrinkles, inclusion of auxiliary materials, and damage to the wrapping fabric. This method effectively improves the efficiency and stability of the adhesive flange connection to the blade, and avoids the defects such as wrinkles, inclusion of auxiliary materials, and damage to the wrapping fabric that occur when the adhesive flanges at the leading and trailing edges of the blade are drawn onto the main mold flange. It also enables a smooth connection of the adhesive flange at the mold joint, reduces the structural complexity of the adhesive flange, and decreases the complexity of the process of connecting the adhesive flange to the blade.
[0007] To achieve the above objectives, the technical solution of the present invention is implemented as follows:
[0008] The present invention relates to a connection method for adhesive flanges of wind turbine blades, comprising the following steps:
[0009] Step 1: Fabrication of precast slabs: Precast slabs include precast slab one and precast slab two;
[0010] Step 2: Place both the adhesive flange and the precast double plate on the blade;
[0011] Step 3: Place both the first precast plate and the second precast plate inside the flange mold;
[0012] Step 4: Vacuum casting of the bonding flange and blade;
[0013] Step 5: Heat and cure the location of the bonding flange on the blade, and remove the flange mold and prefabricated plate to obtain the required blade.
[0014] Furthermore, the blade includes a blade shell, a web, and a main beam. The main beam is connected to the blade shell through the web. The blade shell includes a PS surface shell and an SS surface shell. The leading and trailing edges of the PS surface shell are respectively connected to the leading and trailing edges of the SS surface shell through adhesive flanges.
[0015] Furthermore, in step one, the precast panel is manufactured as follows: on the mold corresponding to the precast panel, release cloth one, biaxial fiberglass cloth and release cloth two are laid sequentially from the inside to the outside. Then, release cloth one, biaxial fiberglass cloth and release cloth two are heated and cured to obtain a precast semi-finished product. The precast semi-finished product is trimmed to obtain the required size of the precast panel. Release cloth one and release cloth two are removed to obtain the required precast panel.
[0016] Furthermore, step one includes:
[0017] Step S11: Select the first mold corresponding to the prefabricated plate, and make the prefabricated plate on the first mold;
[0018] Step S12: Select the second mold corresponding to the precast slab, and make the precast slab on the second mold.
[0019] Furthermore, in step two, the bonding flange includes a front flange, a rear flange, and a foam core material. The front flange is located at the end of the front edge of the SS face shell near the front edge of the PS face shell, the rear flange is located at the end of the rear edge of the SS face shell near the rear edge of the PS face shell, and the foam core material is located at the end of the rear edge of the SS face shell near the rear edge of the PS face shell.
[0020] Furthermore, the foam core material is a trailing edge socket foam core material, and a core material wrapping cloth is wrapped around the outer wall of the foam core material. The core material wrapping cloth is connected to the PS surface shell by structural adhesive.
[0021] Furthermore, step two includes:
[0022] Step S21: Place the adhesive flange at the joint between the leading and trailing edges of the SS face shell of the blade;
[0023] Step S22: Place one end of the precast second plate between the bonding flange and the vacuum auxiliary material, or place one end of the precast second plate between the core material wrapping cloth and the vacuum auxiliary material, and place the other end of the precast second plate on the top of the main mold flange.
[0024] Furthermore, step three includes:
[0025] Step S31: Apply vacuum auxiliary material to the outside of the bonding flange and the core material wrapping cloth;
[0026] Step S32: Set a flange mold on the outside of the vacuum-assisted material;
[0027] Step S33: Set a prefabricated plate at the butt joint position on the inside of the flange mold;
[0028] Step S34: Lay a flow guide net and a vacuum bag membrane in the inner cavity of the blade from the inside to the outside.
[0029] Step S35: Install a glue injection tube between the flow guide net and the vacuum bag film, and install a vacuum extraction tube on the main mold flange for use during vacuum injection molding.
[0030] Furthermore, in step S32, the vacuum auxiliary materials are a release cloth and a perforated isolation film, which are respectively arranged on the outside of the core material wrapping cloth, the front flange, and the rear flange in a bottom-to-top direction.
[0031] Furthermore, step four includes:
[0032] Step S41: Use a vacuum system to evacuate the inside of the blade through a vacuum tube;
[0033] Step S42: Use a potting device to inject epoxy resin into a vacuum system through a glue injection tube for potting and molding.
[0034] Compared with the prior art, the connection method of the wind turbine blade adhesive flange described in this invention has the following advantages:
[0035] The method described above effectively solves the efficiency and stability problems of connecting blades with adhesive flanges, and avoids defects such as wrinkles, auxiliary material inclusions, and cuts to the wrapping cloth that occur when the adhesive flanges at the leading and trailing edges of the blades are drawn onto the main mold flange. It enables the adhesive flanges to be smoothly connected at the mold joint, reduces the structure of the adhesive flanges, reduces the complexity of the process of connecting blades with adhesive flanges, ensures the molding quality of adhesive flanges, has a reasonable process setting, strong operability, and high production efficiency. Attached Figure Description
[0036] The accompanying drawings, which constitute a part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:
[0037] Figure 1 This is a schematic diagram of the overall structure of the wind turbine blade and the bonding flange.
[0038] Figure 2 This is a detailed schematic diagram of a portion of the overall structure I between the wind turbine blade and the bonding flange.
[0039] Figure 3 A schematic diagram showing the details of the trailing edge of the blade;
[0040] Figure 4 A detailed schematic diagram of the butt joint of the bonding flange mold;
[0041] Figure 5 This is a schematic diagram of the wind turbine blade from root to tip.
[0042] Explanation of reference numerals in the attached drawings: 1. Precast slab; 11. Precast slab one; 12. Precast slab two; 2. Adhesive flange; 21. Front flange; 22. Rear flange; 23. Foam core material; 231. Core material wrapping cloth; 3. Flange mold; 4. Blade; 41. Blade shell; 42. Web plate; 43. Main beam; 5. Main mold flange; 6. Vacuum auxiliary material; 61. Release cloth; 62. Perforated release film. Detailed Implementation
[0043] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to communicate the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.
[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.
[0045] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0046] In existing technologies, the front and rear edge bonding flange fabric layers rely on the bonding flange mold for positioning, and are laid and cast together with the shell fabric layers. Since the bonding flange mold is segmented, wrinkles and steps are prone to appear at the mold joints. The fabric layers of the bonding flange are easily drawn to the edge of the main mold flange by vacuum, resulting in defects such as auxiliary material inclusions and fabric layer distortion. The operable space gradually decreases from the blade root to the middle of the blade at the trailing edge. The curvature of the trailing edge bonding flange mold is too large, making it difficult to adjust the fabric layers and adhere them firmly to the mold, wasting a lot of time. The trailing edge area of the blade with a trailing edge gap of less than 5cm is difficult to operate manually and cannot be laid on the bonding flange mold. It is necessary to add wrapping cloth, but the wrapping cloth is easily drawn to the main mold flange during vacuuming, forming wrinkles that are not easy to identify. The subsequent cutting process will damage this part of the wrapping cloth.
[0047] To address the issue that defects, such as wrinkles, inclusion of auxiliary materials, and damage to the wrapping fabric, easily occur when the bonding flange 2 of the leading and trailing edges of the blade is drawn onto the main mold flange in the existing technology, this embodiment proposes a connection method for the bonding flange of the wind turbine blade. Step 1: Fabrication of precast plate 1: Precast plate 1 includes precast first plate 11 and precast second plate 12.
[0048] Step 2: Place both the adhesive flange 2 and the precast plate 12 on the blade 4;
[0049] Step 3: Place both the precast plate 11 and the precast plate 12 inside the flange mold 3;
[0050] Step 4: Vacuum casting molding of flange 2 and blade 4;
[0051] Step 5: Heat and cure the position of the bonding flange 2 on the blade 4, and remove the flange mold 3 and the prefabricated plate 11 to obtain the required blade 4.
[0052] By setting the precast plate 1 in the connection method and cooperating with the adhesive flange 2, the efficiency and stability of the adhesive flange 2 connecting the blade 4 can be effectively solved. It also avoids the occurrence of defects such as wrinkles, auxiliary material inclusions, and cuts to the wrapping cloth when the adhesive flange 2 at the front and rear edges of the blade 4 is pulled onto the main mold flange 5. This enables the adhesive flange 2 to be smoothly connected at the joint of the flange mold 3, reduces the structure of the adhesive flange 2, and reduces the complexity of the process of connecting the adhesive flange 2 to the blade 4.
[0053] The blade 4 includes a blade shell 41, a web 42, and a main beam 43. The main beam 43 is connected to the blade shell 41 via the web 42 and is also connected to the web 42 via structural adhesive. The blade shell 41 of the blade 4 includes a PS surface shell and an SS surface shell. The leading and trailing edges of the PS surface shell are respectively connected to the leading and trailing edges of the SS surface shell via adhesive flanges 2. The adhesive flanges 2 are respectively connected to the leading and trailing edges of the PS surface shell and the SS surface shell via structural adhesive. Here, the PS surface shell refers to the windward surface shell of the blade 4, and the SS surface shell is the leeward surface shell of the blade 4. In step one, the precast plate 1 is manufactured by: applying a self-adhesive strip along the mold corresponding to the precast plate 1. From the inside out, release cloth 1, biaxial fiberglass cloth, and release cloth 2 are laid sequentially. Then, release cloth 1, biaxial fiberglass cloth, and release cloth 2 are heated and cured to obtain a precast semi-finished product. The precast semi-finished product is trimmed to obtain the required dimensions of the precast panel 1. Release cloth 1 and release cloth 2 are removed to obtain the required precast panel 1. Each of the three release cloths (release cloth 1, biaxial fiberglass cloth, and release cloth 2) is provided at least once. In this embodiment, preferably, each of the three release cloths (release cloth 1, biaxial fiberglass cloth, and release cloth 2) is provided once, and the biaxial fiberglass cloth is laid by hand lay-up. The biaxial fiberglass cloth is epoxy resin impregnated with a surface density of 200 g / m² and a weaving direction of ±45°. Step 1 includes:
[0054] Step S11: Select the first mold corresponding to the prefabricated plate 11, and make the prefabricated plate 11 on the first mold;
[0055] Step S12: Select the second mold corresponding to the precast second plate 12, and fabricate the precast second plate 12 on the second mold. In this embodiment, the precast first plate 11 is a flat fiberglass precast plate with a thickness of <0.5mm. The precast second plate 12 is a "T-shaped" fiberglass precast plate, that is, the precast second plate 12 includes a second plate part and a second plate part. The second plate part and the second plate part are connected and set perpendicularly to form a T-shaped fiberglass precast plate.
[0056] By using prefabricated plate 11 and prefabricated plate 12, the molding quality of the adhesive flange 2 can be guaranteed. The process is reasonably set, highly operable, and has high production efficiency. It also effectively solves defects such as wrinkles, steps, auxiliary material inclusions, and cuts to the wrapping cloth in the adhesive flange 2. In addition, the prefabricated plate 11 can be removed and reused after the adhesive flange 2 is formed, which can greatly save resources and reduce costs. Furthermore, since both the "T-shaped" fiberglass prefabricated plate and the flat fiberglass prefabricated plate are made of biaxial fiberglass cloth with a layer density of 200g / ㎡ and a weaving direction of ±45°, they can conform to the flange mold 3 and the rear edge socket foam core material 23 under vacuum. The overall fit is good, which can solve the problem of wrinkles, auxiliary material inclusions, and cuts to the wrapping cloth caused by the adhesive flange 2 being difficult to identify when it is pulled onto the main mold flange 5. This greatly improves the bonding effect of the adhesive flange 2 and enhances the stability and reliability of the blade shell 41 bonding.
[0057] In step two, the bonding flange 2 includes a leading flange 21, a trailing flange 22, and a foam core material 23. The leading flange 21 is located at the end of the leading edge of the SS surface shell near the leading edge of the PS surface shell. The trailing flange 22 is located at the end of the trailing edge of the SS surface shell near the trailing edge of the PS surface shell. The foam core material 23 is located at the end of the trailing edge of the SS surface shell near the trailing edge of the PS surface shell. Both the trailing flange 22 and the foam core material 23 are bonding parts of the trailing edge of the blade 4 between the SS surface shell and the PS surface shell, representing two different bonding methods. They coexist at different length directions of the blade 4. The bonding method near the blade root area is the trailing flange 22, while the bonding method near the blade tip area is the foam core material 23. 3 is the trailing edge socket foam core material. The outer wall of the foam core material 23 is wrapped with a core material wrapping cloth 231. The core material wrapping cloth 231 is connected to the PS surface shell by structural adhesive. Here, the foam core material 23 refers to the trailing edge socket foam core material 23. The foam core material 23 is wrapped with at least one layer of core material wrapping cloth 231 to form a trailing edge socket wrapped foam structure. The bonding flange 2 is composed of a front edge flange 21, a trailing edge flange 22, and a trailing edge socket wrapped foam structure. The bonding flange 2 and the blade shell 41 fabric layer are integrally cast and molded. Preferably, the front edge flange 21 fabric layer, the trailing edge flange 22 fabric layer, and the core material wrapping cloth 231 are all integrally cast and molded with the blade shell 41 fabric layer.
[0058] Specifically, step two includes:
[0059] Step S21: Lay the glass fiber and sandwich materials required for the production of blade shell 41, namely foam core material 23, main beam 43, trailing edge beam and other components, according to the process document requirements. After the blade shell 41 is laid, then set the bonding flange 2 at the joint of the front and rear edges of the SS surface shell of the blade 4 according to the process requirements.
[0060] Step S22: Place one end of the precast second plate 12 between the bonding flange 2 and the vacuum auxiliary material 6, or place one end of the precast second plate 12 between the core material wrapping cloth 231 and the vacuum auxiliary material 6, and place the other end of the precast second plate 12 on the top of the main mold flange 5.
[0061] By first laying the adhesive flange 2, then placing the precast plate 12, i.e., the "T-shaped" fiberglass precast plate, and after the blade shell 41 is laid, the front flange 21, the rear flange 22, the rear socket foam core material 23, and the core material wrapping cloth 231 are laid according to the process requirements. The "T-shaped" fiberglass precast plate is then inserted from the root to the tip of the blade 4 into the mold joint area of the adhesive flange 2 and the rear socket core material wrapping cloth 231, and hung on the main mold flange 5. This effectively improves the connection tightness between the adhesive flange 2 and the core material wrapping cloth 231, and enhances the connection between the PS surface and the SS surface of the blade 4. Here, "from the root to the tip of the blade 4" refers to the blade root and blade tip in the length direction of 4, i.e., from right to left in the figure. For example, if the total length of the blade 4 is 126m, the 0m position is the root of the blade 4, and the 126m position is the tip of the blade 4, as shown in the figure.
[0062] Step three includes:
[0063] Step S31: Vacuum auxiliary material 6 is placed on the outside of the bonding flange 2 and the core material wrapping cloth 231;
[0064] Step S32: A flange mold 3 is set on the outside of the vacuum auxiliary material 6. The flange mold 3 includes a mold part 1 and a mold part 2. The mold part 1 and the mold part 2 are set to abut against each other, and the connection between the mold part 1 and the mold part 2 forms a butt joint.
[0065] Step S33: Set a prefabricated plate 11 at the butt joint position inside the flange mold 3;
[0066] Step S34: A flow guide net and a vacuum bag film are laid in the inner cavity of the blade 4 from the inside to the outside. The vacuum bag film is set outside the flow guide net and is set in a conformal manner outside the flow guide net and the flange mold 3. The end of the vacuum bag film away from the flow guide net is connected to the main mold flange 5 through sealing tape.
[0067] Step S35: Install a glue injection tube between the flow guide net and the vacuum bag film, and install a vacuum tube on the main mold flange 5 for use during vacuum injection molding;
[0068] In step S32, the vacuum auxiliary material 6 is a release cloth 61 and a perforated isolation film 62. The release cloth 61 and the perforated isolation film 62 are respectively arranged on the outside of the core material wrapping cloth 231, the front flange 21 and the rear flange 22 in a direction from bottom to top. In this embodiment, "top" refers to the position above in the figure, and "bottom" is the opposite of "top".
[0069] By first placing the flat fiberglass precast plate and then placing the flange mold 3, a good vacuum environment can be provided for the vacuum system injection molding of the bonding flange 2. In addition, by laying vacuum auxiliary material 6 on the outside of the bonding flange 2 and the socket core material wrapping cloth 231, placing the flange mold 3 in sequence, and symmetrically placing the prepared precast plate 11, i.e. the flat fiberglass precast plate, at the joint of the flange mold 3, laying the flow guide net and vacuum bag film in the inner cavity of the blade 4, and laying the glue injection pipe between the flow guide net and the vacuum bag film, and setting the vacuum tube on the main mold flange 5, the flat fiberglass precast plate on the inner side of the joint of the flange mold 3 helps to eliminate defects such as wrinkles and steps in the bonding flange 2 caused by the steps of the joint of the flange mold 3, so that the fabric layer of the bonding flange 2 can smoothly transition at the joint of the flange mold 3, thereby improving the bonding quality and effect of the bonding flange 2.
[0070] Step four includes:
[0071] Step S41: Use a vacuum system to evacuate the inside of blade 4 through a vacuum tube;
[0072] Step S42: Use a potting device to inject epoxy resin into a vacuum system through a dispensing tube for potting and molding;
[0073] Specifically, before the bonding flange 2 is formed, a layer of sealing tape is used to stick to the main mold flange 5 to seal a vacuum bag film and the main mold flange 5 to form a vacuum system. In terms of operation: the vacuum system is established using sealing tape, and when the internal cavity of the vacuum system reaches a certain vacuum degree, epoxy resin is injected into the vacuum system for casting and molding using an online injection device. Step five specifically includes: turning on the main mold heating system to heat and cure the blade 4 at the position where the bonding flange 2 is set; after complete curing, the vacuum auxiliary material 6 and the flange mold 3 are removed, and the precast plate 11, i.e., the flat fiberglass precast plate, is collected so that the flange mold 3 and the precast plate 11 can be reused.
[0074] By symmetrically placing flat fiberglass precast plates with a thickness of <0.5mm in the butt joint area of the flange mold 3, and placing a "T-shaped" fiberglass precast plate along the edge of all the bonding flanges 2 and socket foam core material 23, the flange mold 3 is placed in the accurate position, the bonding flanges 2 are laid up normally, and vacuum injection molding is performed. After the blade shell 41 is heated and cured, the vacuum auxiliary material 6 and the flange mold 3 are removed, realizing the reuse of the flange mold 3 and the precast plate 11. Furthermore, due to the setting of the precast plate 12, the problem of defects easily generated when the fiberglass cloth of the bonding flanges 2 at the front and rear edges of the blade 4 is vacuum-drawn onto the main mold flange 5 can be effectively avoided, thus improving the connection stability of the blade 4 structure.
[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for connecting adhesive flanges for wind turbine blades, characterized in that, Includes the following steps: Step 1, Fabrication of precast slab (1): The precast slab (1) includes precast slab one (11) and precast slab two (12); Step 2: Place the bonding flange (2) and the precast plate (12) on the blade (4); place one end of the precast plate (12) between the bonding flange (2) and the vacuum auxiliary material (6), and place the other end of the precast plate (12) on the top of the main mold flange (5); Step 3: Place both the precast plate 1 (11) and the precast plate 2 (12) inside the flange mold (3); place the precast plate 1 (11) at the butt joint position inside the flange mold (3); Step 4: Vacuum casting molding of the bonding flange (2) and blade (4); Step 5: Heat and cure the position of the bonding flange (2) on the blade (4), and remove the flange mold (3) and the prefabricated plate (11) to obtain the required blade (4); Step one includes: Step S11: Select the first mold corresponding to the precast plate (11) and make the precast plate (11) on the first mold; Step S12: Select the second mold corresponding to the precast second plate (12) and make the precast second plate (12) on the second mold; Specifically, the first precast panel (11) is a flat fiberglass precast panel with a thickness of <0.5mm. The second precast panel (12) includes a first part of the second panel and a second part of the second panel. The first part of the second panel is connected to the second part of the second panel, and the first part of the second panel and the second part of the second panel are set perpendicularly to form a T-shaped fiberglass precast panel.
2. The connection method of the wind turbine blade adhesive flange according to claim 1, characterized in that, The blade (4) includes a blade shell (41), a web (42) and a main beam (43). The main beam (43) is connected to the blade shell (41) through the web (42). The blade shell (41) includes a PS surface shell and an SS surface shell. The leading edge and trailing edge of the PS surface shell are respectively connected to the leading edge and trailing edge of the SS surface shell through adhesive flanges (2).
3. The connection method for a wind turbine blade adhesive flange according to claim 2, characterized in that, In step one, the precast slab (1) is made as follows: on the mold corresponding to the precast slab (1), release cloth one, biaxial fiberglass cloth and release cloth two are laid in sequence from the inside to the outside. Then, release cloth one, biaxial fiberglass cloth and release cloth two are heated and cured to obtain a precast semi-finished product. The precast semi-finished product is trimmed to obtain the required size of the precast slab (1). Release cloth one and release cloth two are removed to obtain the required precast slab (1).
4. The connection method of the wind turbine blade adhesive flange according to claim 3, characterized in that, In step two, the bonding flange (2) includes a front flange (21), a rear flange (22), and a foam core material (23). The front flange (21) is located at the end of the front edge of the SS surface shell near the front edge of the PS surface shell, the rear flange (22) is located at the end of the rear edge of the SS surface shell near the rear edge of the PS surface shell, and the foam core material (23) is located at the end of the rear edge of the SS surface shell near the rear edge of the PS surface shell.
5. The connection method of the wind turbine blade adhesive flange according to claim 4, characterized in that, The foam core material (23) is a trailing edge socket foam core material. The outer wall of the foam core material (23) is wrapped with a core material wrapping cloth (231), which is connected to the PS surface shell by structural adhesive.
6. The connection method of the wind turbine blade adhesive flange according to claim 5, characterized in that, Step two includes: Step S21: Place the adhesive flange (2) at the joint between the leading and trailing edges of the SS surface shell of the blade (4); Step S22: Place one end of the precast second plate (12) between the core material wrapping cloth (231) and the vacuum auxiliary material (6), and place the other end of the precast second plate (12) on the top of the main mold flange (5).
7. The connection method of the wind turbine blade adhesive flange according to claim 6, characterized in that, Step three includes: Step S31: Vacuum auxiliary material (6) is placed on the outside of the bonding flange (2) and the core material wrapping cloth (231); Step S32: Set flange mold (3) on the outside of vacuum-assisted material (6); Step S33: Set a prefabricated plate (11) at the butt joint position inside the flange mold (3); Step S34: Lay a flow guide net and a vacuum bag membrane in the inner cavity of the blade (4) from the inside to the outside; Step S35: Set a glue injection tube between the flow guide net and the vacuum bag film, and set a vacuum tube on the main mold flange (5) for use during vacuum injection molding.
8. The connection method of the wind turbine blade adhesive flange according to claim 7, characterized in that, In step S32, the vacuum auxiliary material (6) is a release cloth (61) and a perforated isolation film (62). The release cloth (61) and the perforated isolation film (62) are respectively arranged on the outside of the core material wrapping cloth (231), the front flange (21), and the rear flange (22) in a direction from bottom to top.
9. The connection method of the adhesive flange for wind turbine blades according to claim 7, characterized in that, Step four includes: Step S41: Use a vacuum system to evacuate the inside of the blade (4) through a vacuum tube; Step S42: Use a potting device to inject epoxy resin into a vacuum system through a glue injection tube for potting and molding.