Wind power blade bonding angle mold turning structure

Abstract

This application provides a wind turbine blade bonding angle mold fabrication structure, relating to the field of wind turbine blade manufacturing technology. It includes: a mold body, comprising a faceted surface and a first flange; a support body, disposed along the leading and trailing edges of the mold body, serving as a support base for the bonding angle mold fabric layer; the support body is a rigid structure; the support body includes an adhesive portion and a second flange, the adhesive portion being fitted to the faceted surface, and the second flange portion being fitted to the first flange portion. The wind turbine blade bonding angle mold fabrication structure of this application directly replaces the easily deformable simulated structural layer with a rigid support body. On the one hand, this prevents slippage during layering, resulting in sharp edges and a complete fit between the adhesive portion and the faceted surface, leading to better quality of the poured bonding angle mold. On the other hand, it significantly improves layering efficiency. Furthermore, by replacing the simulated structural layer with a support body, the bonding angle mold fabric layer can be more easily poured through, significantly reducing resin consumption.

Description

Technical Field

[0001] This application relates to the field of wind turbine blade manufacturing technology, and in particular to a mold-making structure for bonding angles of wind turbine blades. Background Technology

[0002] Wind turbine blades are one of the key components of wind turbine generators. During their manufacturing process, the pressure and suction sides of the shell are bonded together using an adhesive corner. The manufacturing quality of the adhesive corner mold directly affects the blade's sealing performance, structural strength, and fatigue life.

[0003] In existing technologies, the manufacturing of bonding angle molds for wind turbine blades mainly involves two methods: empty mold casting and shell casting. Empty mold casting involves directly laying a simulated structural layer and a bonding angle mold fabric layer on the mold without laying the main shell, followed by injection molding. Shell casting involves laying the bonding angle mold fabric layer directly on the main shell after it has been laid, and then injecting it along with the shell. However, in the empty mold casting process, the simulated structural layer is prone to slippage, leading to inaccurate bonding angle shapes; when laying thick fiberglass fabric layers in extremely narrow areas, the resin cannot fully impregnate, easily resulting in dry yarn or uncured areas. In the shell casting process, cutting the fabric layer at the trailing edge can easily cause fabric cross-layering (fabric layer misalignment), requiring rework; pressure loss is prone to occur during mold closing, making the mold unable to open and even damaging the blade itself.

[0004] Therefore, in the existing technology, the manufacturing method of the bonding angle mold for wind turbine blades produces bonding angle molds with insufficient geometric accuracy, which affects the quality of blade mold assembly and structural strength. Utility Model Content

[0005] In view of the above problems, this application provides a wind turbine blade bonding angle mold making structure to solve the problem that the bonding angle mold manufactured by the existing wind turbine blade bonding angle mold manufacturing method has insufficient geometric accuracy, which affects the blade mold closing quality and structural strength.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] This application provides a mold-making structure for bonding angles of wind turbine blades, including:

[0008] The mold body includes the mold face and the first flange.

[0009] The support body is set along the front and rear edge profiles of the mold body and serves as a support base for the bonding corner mold fabric layer.

[0010] The support body is a rigid structure; the support body includes an adhesive part and a second flange part, the adhesive part is fitted to the molded surface, and the second flange part is fitted to the first flange part.

[0011] In one possible implementation, the support body includes multiple segments that are spliced ​​together along the axial direction of the mold body.

[0012] In one possible implementation, along the axial direction of the mold body, the thickness of the multiple segments of the adhesive portion varies with the different radial cross-sectional positions of the adhesive angle mold.

[0013] In one possible implementation, the segments are provided with connecting portions; along the axial direction of the mold body, the connecting portions are provided on at least one side of the adhesive portion; adjacent segments are connected by overlapping the connecting portions.

[0014] In one possible implementation, the adhesive portion is bonded to the molded surface.

[0015] In one possible implementation, the support is a solid structure.

[0016] In one possible implementation, the support is a high-temperature resistant component.

[0017] In one possible implementation, the support is an additively manufactured part;

[0018] Alternatively, the material of the support structure can be the same as the core material of the wind turbine blade.

[0019] In one possible implementation, a separation membrane is provided on the side of the support body away from the mold body, and the separation membrane is disposed between the support body and the adhesive corner mold fabric layer.

[0020] In one possible implementation, the mold body, support, release membrane, and adhesive corner mold fabric layer are integrally formed by resin injection molding.

[0021] The wind turbine blade bonding angle mold fabrication structure provided in this application directly replaces the easily deformable simulated structural layer with a rigid support. This support serves as the base for the bonding angle mold fabric layer, preventing slippage during layering, ensuring sharp edges, and perfectly fitting the bonding area to the mold surface. This minimizes manual laying errors and results in a higher quality bonding angle mold. Furthermore, in related technologies, all simulated structural fabric layers below the bonding angle mold need to be laid layer by layer, taking approximately six hours each time, which is time-consuming. In contrast, this application replaces the simulated structural layer with a support, requiring only the support to be fixed to the front and rear edge molds, reducing the time to approximately one hour and significantly improving laying efficiency. Moreover, replacing the simulated structural layer with a support allows for easier penetration of the bonding angle mold fabric layer, significantly reducing resin usage and achieving cost reduction.

[0022] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the wind turbine blade bonding angle mold flipping structure provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of the wind turbine blade bonding angle mold fabrication structure provided in the embodiments of this application;

[0025] Figure 2 A perspective view of the first type of support and mold body of the wind turbine blade bonding angle mold making structure provided in the embodiments of this application;

[0026] Figure 3 A cross-sectional view of the first type of support body and mold body of the wind turbine blade bonding angle mold making structure provided in the embodiments of this application;

[0027] Figure 4 for Figure 2 Exploded view of the first type of support shown;

[0028] Figure 5 for Figure 4 A three-dimensional view of the segments of the first type of support shown;

[0029] Figure 6 A perspective view of the second type of support and mold body for the wind turbine blade bonding angle mold making structure provided in the embodiments of this application;

[0030] Figure 7 A cross-sectional view of the second type of support and mold body of the wind turbine blade bonding angle mold making structure provided in the embodiments of this application;

[0031] Figure 8 for Figure 6 Exploded view of the second type of support shown;

[0032] Figure 9 for Figure 8 The second type of support structure is shown in a three-dimensional view of its segments.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10. Mold body; 11. Mold surface; 12. First flange;

[0035] 20. Support body; 201. Segment; 21. Adhesive part; 22. Second flange part; 23. Connecting part;

[0036] 30. Separating membrane;

[0037] 40. Adhesive corner mold fabric layer. Detailed Implementation

[0038] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0039] Secondly, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0040] The main shell of a wind turbine blade is the main structure of the blade and bears the main load. The bonding angles of the leading and trailing edges of the wind turbine blade are located in the bonding area between the leading and trailing edges of the blade. They are used to connect the two halves of the blade shell (usually the pressure surface and the suction surface) to ensure the sealing and strength of the overall structure. The bonding angle mold of the wind turbine blade is a special mold used to manufacture the bonding angle. Its shape and precision directly affect the quality of the bonding angle and the blade performance.

[0041] In terms of related technologies, the manufacturing of bonding angle molds for wind turbine blades mainly involves two methods: empty mold casting and shell casting. The main process for empty mold casting of bonding angle molds includes: laying a structural fabric layer (simulating the actual structure) under the bonding angle mold at the front and rear edges of the mold; laying a release film, then laying the bonding angle mold fabric layer; casting; testing the gap between the bonding angle areas at the front and rear edges; and finally, closing the mold and curing. However, in the process of empty mold casting of bonding angle molds, on the one hand, the simulated structural layer is prone to slippage, leading to inaccurate bonding angle shapes; on the other hand, when laying thick fiberglass fabric layers in extremely narrow areas, the resin is difficult to completely impregnate, easily resulting in dry yarn or uncured phenomena. The main process for shell casting of bonding angle molds includes: after all structural laying of the actual blade is completed, laying the bonding angle mold fabric layer at the front and rear edges; casting along with the shell; testing the gap between the bonding angles at the front and rear edges with the shell attached; and finally, closing the mold and curing after the gap is deemed acceptable. However, during the fabrication of the bonding corner mold with the shell, fabric layer misalignment (cross-layer fabric) is easily caused when cutting the fabric layers at the rear edge, requiring rework; pressure loss is also prone to occur during mold closing, causing the mold to be unable to open, or even damaging the blade body. In summary, the manufacturing method of the bonding corner mold for wind turbine blades in related technologies suffers from insufficient geometric accuracy of the bonding corner mold, affecting the quality of blade mold closing and structural strength.

[0042] To address the aforementioned technical problems, this application provides a wind turbine blade bonding angle mold fabrication structure, comprising: a mold body, including a profile and a first flange; a support body, disposed along the front and rear edges of the mold body, the support body serving as a support base for the bonding angle mold fabric layer; the support body is a rigid structure; the support body includes an adhesive portion and a second flange, the adhesive portion being fitted to the profile and the second flange being fitted to the first flange. The wind turbine blade bonding angle mold fabrication structure provided in this application directly replaces the easily deformable simulated structural layer with a rigid support. This support serves as the base for the bonding angle mold fabric layer, preventing slippage during layering, ensuring sharp edges, and perfectly fitting the bonding area to the mold surface. This minimizes manual laying errors and results in a higher quality bonding angle mold. Furthermore, in related technologies, all simulated structural fabric layers below the bonding angle mold need to be laid layer by layer, taking approximately six hours each time, which is time-consuming. In contrast, this application replaces the simulated structural layer with a support, requiring only the support to be fixed to the front and rear edge molds, reducing the time to approximately one hour and significantly improving laying efficiency. Moreover, replacing the simulated structural layer with a support allows for easier penetration of the bonding angle mold fabric layer, significantly reducing resin usage and achieving cost reduction.

[0043] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0044] Please refer to Figures 1-9 This application provides a wind turbine blade bonding angle mold fabrication structure, including:

[0045] Mold body 10, please refer to Figure 1 As shown, the mold body 10 includes a molded surface 11 and a first flange portion 12;

[0046] Support body 20 is provided along the front and rear edge profiles of mold body 10. Support body 20 is used as a support base for bonding corner mold fabric layer 40.

[0047] Support 20 is a rigid structure; please refer to Figure 1 As shown, the support body 20 includes an adhesive part 21 and a second flange part 22. The adhesive part 21 is fitted to the molded surface 11, and the second flange part 22 is fitted to the first flange part 12.

[0048] It should be noted that the wind turbine blade bonding angle mold making structure of this application adopts empty mold making of bonding angle to avoid the risks of fabric crossing and pressure leakage caused by shell making.

[0049] In this embodiment, when fabricating the bonding corner using a hollow mold, the structural layer of the bonding area of ​​the bonding corner is first simulated in 3D software through simulated layering, and a 3D model of the support body 20 is output. Then, based on the 3D model of the support body 20, a solid structure of the support body 20 is formed, and the support body 20 is a rigid structure. Next, the solid structure of the support body 20 is laid on the front and rear edges of the mold body 10, so that the bonding part 21 is fitted to the mold surface 11, and the second flange part 22 is fitted to the first flange part 12. Thus, the rigid support body 20 directly replaces the easily deformable simulated structural layer, making the support body 20 the supporting base for the bonding corner mold layer 40. On the one hand, this prevents deformation during layering. The current downward slope results in sharp edges and corners, and the bonding part 21 is completely fitted to the molded part 11, which can minimize manual laying errors and produce a better quality bonding corner mold. On the other hand, in related technologies, all the simulated structure fabric layers under the bonding corner mold need to be laid one by one, which takes about six hours and is time-consuming. However, this application replaces the laying of simulated structure layers with support body 20, which only requires fixing the solid of support body 20 to the front and rear edge molds, which takes about one hour and significantly improves the laying efficiency. Furthermore, by replacing the laying of simulated structure layers with support body 20, this application can more easily fill the bonding corner mold fabric layer 40 and significantly reduce the amount of resin used, thereby reducing costs.

[0050] In one possible implementation, please see Figure 2 and Figure 4 As shown, the support body 20 includes multiple segments 201, which are spliced ​​together along the axial direction of the mold body 10.

[0051] Because the main shell of the wind turbine blade has a long front and rear edge length, in this embodiment, the support body 20 is segmented. By manufacturing the support body 20 in segments, the long support body 20 can be disassembled into multiple short segments 201 (e.g., 500mm / segment). On the one hand, this avoids the feasibility and accuracy of the support body 20 being affected by the size limitations of the manufacturing equipment. On the other hand, the front and rear edge surfaces of the mold body (especially the bonding corner area) have curvature changes, and the layup thickness is different at different cross-sectional positions. By manufacturing the support body 20 in segments, the fitting accuracy with the mold body is ensured. Furthermore, by manufacturing the support body 20 in segments, after the dimensions of each segment are determined, multiple manufacturing equipment can work simultaneously to manufacture each segment 201, which is beneficial to improving production efficiency.

[0052] In one possible implementation, along the axial direction of the mold body 10, the thickness of the bonding portion 21 of the plurality of segments 201 varies with the different radial cross-sectional positions of the bonding angle mold.

[0053] In this embodiment, by adjusting the thickness of the adhesive portion 21 along the axial direction of the mold body 10 according to the radial cross-sectional position, on the one hand, the thickness of the adhesive portion 21 can be made to perfectly match the surface curvature and thickness requirements of the corresponding position, ensuring the fitting accuracy between the support body 20 and the mold body 10, fundamentally solving the problem of geometric deviation of the adhesive angle caused by the "flexible sagging" of the traditional simulated structural layer, and on the other hand, the resin flow path can be optimized in a targeted manner to improve the injection quality.

[0054] Furthermore, when performing three-dimensional modeling of the support 20, since the ply thickness is different at different cross-sectional locations, the ply thickness can be calculated in 500mm segments to obtain the cross-sectional dimensions of 500mm segments.

[0055] In one possible implementation, please see Figure 9 As shown, segment 201 is provided with a connecting portion 23; along the axial direction of the mold body 10, the connecting portion 23 is provided on at least one side of the adhesive portion 21; please refer to Figure 6 , Figure 7 and Figure 8 As shown, two adjacent segments 201 are connected by overlapping joints 23.

[0056] In this embodiment, two adjacent segments 201 are connected by overlapping joints 23, thereby ensuring the continuity of the support body 20, optimizing the stress distribution of the bonding corner mold, and avoiding local stress concentration.

[0057] Furthermore, the thickness of the connecting part 23 is less than the thickness of the segment 201 in which the connecting part 23 is located. When two adjacent segments 201 overlap each other through the connecting part 23, the sum of the thicknesses of the two corresponding connecting parts 23 can enable a smooth transition between the two adjacent segments 201.

[0058] In one possible implementation, please see Figure 1 and Figure 3 As shown, the adhesive part 21 is bonded to the molded part 11.

[0059] In this embodiment, by bonding the adhesive part 21 to the molded surface 11, it can effectively prevent the support body 20 from slipping down, provide a stable support surface, and ensure the accuracy of the molded surface. On the other hand, it can ensure that the adhesive part 21 and the molded surface 11 are completely fitted, minimize manual laying errors, and improve the pouring quality of the adhesive corner mold. Furthermore, it eliminates the need to lay the simulated structural fabric layer by layer. This application only requires fixing the solid of the support body 20 to the front and rear edge molds, which significantly reduces the time consumption and significantly improves the laying efficiency.

[0060] In one possible implementation, the support 20 is a solid structure.

[0061] In this embodiment, the support 20, made of a solid, rigid material, can completely resist the gravitational force perpendicular to the mold surface, reducing the fitting error between the support 20 and the mold surface 11 of the mold body 10 and ensuring the geometric accuracy of the bonding angle. On the other hand, in related technologies, the simulated fabric layer has a porous structure, which absorbs a large amount of resin during injection, leading to dry fibers or uncured areas within the fabric layer due to under-impregnation, severely affecting the mold strength. The support 20 in this application, by adopting a solid structure, has no resin absorption channels inside. The resin flows only in the uniform gap between the surface of the support 20 and the release liner. This design allows for uniform resin flow, more thorough fabric impregnation, significantly improving the mold's strength and durability, and reducing resin usage and material costs.

[0062] In one possible implementation, the support 20 is a high-temperature resistant component.

[0063] In this embodiment, the support 20 is made of solid high-temperature resistant material, which suppresses the thermal expansion and deformation of the support 20, prevents the surface from sagging due to high-temperature softening, and ensures that the support 20 maintains surface stability during the high-temperature curing process.

[0064] In one possible implementation, the support 20 can be an additively manufactured part (also known as a 3D printed part);

[0065] Alternatively, the material of the support body 20 can be the same as that of the core material of the wind turbine blade. That is, the support body 20 can also be replaced by a special core material for wind turbine blades, such as PVC, PET, Balsa wood, or other materials different from 3D printing. The material must have a certain hardness and can be either soluble or insoluble in resin.

[0066] In this embodiment, when fabricating the bonding corner using a hollow mold, the structural layer of the bonding area of ​​the bonding corner is first simulated in 3D software through simulated layering, and a 3D model of the support body 20 is output. The 3D model of the support body 20 is then printed into segments using 3D printing technology. These segments are solid structures and resistant to high temperatures. The segments are then laid one by one on the front and rear edges of the mold body, thus replacing the simulated structural layer. After the support body 20 is laid, a release film is laid on top of it, followed by the bonding corner mold fabric layer 40. The mold is then poured and molded. The gap between the bonding corner areas at the front and rear edges is tested, and the mold is closed and cured. By replacing the simulated structural layer with a 3D-printed support 20, the following advantages are achieved: First, the layer will not slip during layup, resulting in sharp edges and better quality of the cast-in bonding corner mold. Second, the need for layer-by-layer laying significantly reduces the time required and improves layup efficiency. Third, replacing the simulated structural layer with the 3D-printed support 20 makes it easier to fill the bonding corner mold fabric layer and significantly reduces the amount of resin used, thus reducing costs. Furthermore, the cost of the 3D-printed support 20 is far lower than that of the simulated fabric layer.

[0067] Further, the thickness of the structural layer under the mold at the bonding angle of the front and rear edges of the mold is calculated. After the thickness calculation is completed, a model is created in the 3D software. Since the thickness of the layer is different at different cross-sectional positions, the layer thickness can be calculated in 500mm segments to obtain the cross-sectional dimensions of 500mm segments. By analogy, the cross-sectional models of each segment 201 of the support body 20 are obtained. The cross-sectional models of each segment 201 of the support body 20 are imported into the 3D software, and a complete model is obtained through modeling. The models of each segment 201 are then transferred to the 3D printing equipment for segment printing.

[0068] In one possible implementation, please see Figure 1 As shown, a separation membrane 30 is provided on the side of the support body 20 away from the mold body 10, and the separation membrane 30 is disposed between the support body 20 and the adhesive corner mold fabric layer 40.

[0069] In this embodiment, an isolation membrane 30 is provided between the support 20 and the bonding corner mold fabric layer 40 for isolation. The surface of the isolation membrane 30 is smoother, and a uniform resin flow channel can be provided between the isolation membrane 30 and the bonding corner mold fabric layer 40, thereby optimizing the resin flow path and improving the wetting uniformity of the bonding corner mold fabric layer 40.

[0070] In one possible implementation, the mold body 10, the support 20, the release membrane 30, and the adhesive corner mold fabric layer 40 are integrally formed by resin injection molding.

[0071] In this embodiment of the application, during the resin infusion process, the resin, as a "flowing binder", fills the tiny gaps between the components (such as the interface gap between the support 20 and the mold body 10, and the contact gap between the release film 30 and the adhesive corner mold cloth layer 40), so that the components form a continuous integral structure after the resin is cured, eliminating assembly errors and ensuring the continuity of the surface.

[0072] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0073] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0074] 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 them. 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 or all of the technical features therein. Such 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 application.

Claims

1. A mold-making structure for bonding angles of wind turbine blades, characterized in that, include: The mold body (10) includes a molded surface (11) and a first flange (12); A support body (20) is provided along the front and rear edge profiles of the mold body (10), and the support body (20) is used as a support base for the bonding corner mold fabric layer; The support body (20) is a rigid structure; the support body (20) includes an adhesive part (21) and a second flange part (22), the adhesive part (21) is fitted to the shaped part (11), and the second flange part (22) is fitted to the first flange part (12).

2. The wind turbine blade bonding angle mold fabrication structure according to claim 1, characterized in that, The support (20) includes multiple segments (201), which are spliced ​​together along the axial direction of the mold body (10).

3. The wind turbine blade bonding angle mold forming structure according to claim 2, characterized in that, Along the axial direction of the mold body (10), the thickness of the bonding portion (21) of the plurality of segments (201) varies with the different radial cross-sectional positions of the bonding angle mold.

4. The wind turbine blade bonding angle mold fabrication structure according to claim 2, characterized in that, The segment (201) is provided with a connecting part (23); along the axial direction of the mold body (10), the connecting part (23) is provided on at least one side of the adhesive part (21); two adjacent segments (201) are connected by overlapping each other through the connecting part (23).

5. The wind turbine blade bonding angle mold fabrication structure according to claim 1, characterized in that, The adhesive portion (21) is bonded to the shaped portion (11).

6. The mold-making structure for the bonding angle of wind turbine blades according to any one of claims 1-5, characterized in that, The support (20) is a solid structure.

7. The wind turbine blade bonding angle mold casting structure according to any one of claims 1-5, characterized in that, The support (20) is a high-temperature resistant component.

8. The mold-making structure for the bonding angle of wind turbine blades according to any one of claims 1-5, characterized in that, The support (20) is an additively manufactured part; Alternatively, the material of the support (20) is the same as that of the core material of the wind turbine blade.

9. The mold-making structure for the bonding angle of wind turbine blades according to any one of claims 1-5, characterized in that, The support (20) has an isolation membrane (30) on the side opposite to the mold body (10), and the isolation membrane (30) is disposed between the support (20) and the adhesive corner mold fabric layer.

10. The wind turbine blade bonding angle mold fabrication structure according to claim 9, characterized in that, The mold body (10), the support (20), the isolation membrane (30), and the adhesive corner mold fabric layer are integrally formed by resin injection molding.

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