Method of manufacturing a blade and blade

Abstract

The application provides a manufacturing method of a blade and the blade, which comprises the following steps: forming a blunt trailing edge on a first mold, laying a first structural layer on a second mold, placing the blunt trailing edge into the second mold, partially overlapping the blunt trailing edge and the first structural layer, laying a second structural layer on the upper surfaces of the blunt trailing edge and the first structural layer to form a first shell, forming a second shell on a third mold, and splicing the first shell and the second shell to form the blade. The blunt trailing edge structure is formed on the first mold, and then the blunt trailing edge is placed into the second mold and partially overlaps with the second structural layer, so that the sliding of the blunt trailing edge is avoided, and the use of glue spraying is reduced. In addition, the number of layers of the blunt trailing edge position is small, the resin flow rate is accelerated during pouring, the quality defects such as pouring whitening on the blunt trailing edge can be avoided, and the forming period of the blade can be shortened.

Description

Technical Field

[0001] This application relates to the field of blade manufacturing technology, and in particular to a method for manufacturing a blade and a blade. Background Technology

[0002] Wind turbine blades are a key component of wind turbine generator sets. With the continuous increase in single-unit capacity in the market, the radial dimensions and length of blade designs are constantly increasing. In the design of blunt trailing edge blade airfoils, the dimensions of the vertical blunt trailing edge are continuously increasing. As a vertical structure, the blunt trailing edge is prone to slippage of the core material and wrinkling of the fabric layers during installation. Therefore, a large amount of adhesive is required for bonding and fixing, but excessive adhesive usage can lead to a decrease in the performance of the matrix resin. Furthermore, the numerous structural layers on the blunt trailing edge result in a slow resin flow rate during resin injection, leading to a longer product molding cycle and increasing the likelihood of quality defects such as whitening during injection on the blunt trailing edge. Summary of the Invention

[0003] This application provides a method for manufacturing a blade and a blade to solve at least some of the problems in the related art.

[0004] In a first aspect, this application provides a method for manufacturing a blade, comprising:

[0005] A blunt tail edge is formed on the first mold;

[0006] The first structural layer is laid on the second mold;

[0007] Place the blunt tail edge into the second mold;

[0008] The blunt tail edge is partially overlapped with the first structural layer;

[0009] A second structural layer is laid on the blunt tail edge and the upper surface of the first structural layer to form a first shell;

[0010] The second shell is formed on the third mold;

[0011] The first and second shells are joined together to form the blade.

[0012] Optionally, a blunt tail edge is formed on the first mold, including:

[0013] A first layer of fiber cloth is laid on the first mold;

[0014] The core material is placed horizontally on top of the first fiber cloth layer;

[0015] A second fiber cloth layer is laid on top of the core material;

[0016] Resin is vacuum-injected into the first mold and then heated and cured to form blunt tail edges of the first fiber cloth layer, the core material, and the second fiber cloth layer.

[0017] Optionally, a first fiber cloth layer is laid on the first mold, including:

[0018] One end of the first fiber cloth layer is overlapped to the first flange platform that protrudes horizontally along the edge of the first mold, and the other end of the first fiber cloth layer is reserved to form the first staggered layer.

[0019] Optionally, a second fiber cloth layer is laid on top of the core material, including:

[0020] One end of the second fiber cloth layer is overlapped onto the first flange platform, and the other end of the second fiber cloth layer is reserved to form a second staggered layer.

[0021] Optionally, resin is vacuum-injected into the first mold and then heated and cured to form blunt tail edges for the first fiber cloth layer, the core material, and the second fiber cloth layer, including:

[0022] After the resin is vacuum-injected into the first mold and heated to cure, the first fiber cloth layer, the core material, and the second fiber cloth layer form a blunt tail edge. The first fiber cloth layer and the second fiber cloth layer, which are overlapped on the first flange, form a lug located at the end of the blunt tail edge.

[0023] Optionally, a first structural layer is laid on the second mold, including:

[0024] Lay the outer skin layer on the second mold;

[0025] The third and fourth fiber cloth layers are laid at the trailing edge corner of the blade corresponding to the outer skin layer.

[0026] Optionally, an outer skin layer is laid on the second mold, including:

[0027] The two ends of the outer skin layer are respectively overlapped with the second flange platform that protrudes from the upper surface of the second mold.

[0028] Optionally, a third and fourth fiber cloth layer are laid at the trailing edge corner of the outer skin corresponding to the blade, including:

[0029] The third fiber cloth layer is reserved at one end of the vertical surface of the corresponding blade of the second mold to form a third staggered layer, and the other end is overlapped to the second flange platform that protrudes from the upper surface of the second mold.

[0030] The fourth fiber cloth layer is reserved at one end near the rear edge facade to form a fourth staggered layer, and the other end is overlapped to the second flange platform.

[0031] Optionally, the blunt tail edge is placed in the second mold, including:

[0032] The lifting lug is fitted onto the second flange platform to fix the blunt tail edge to the position of the corresponding rear edge elevation in the second mold.

[0033] Optionally, the blunt trailing edge is partially overlapped with the first structural layer, including:

[0034] The first staggered layer and the third staggered layer are joined together vertically, and the second staggered layer and the fourth staggered layer are joined together vertically.

[0035] Optionally, a second structural layer is deposited on the blunt tail edge and the upper surface of the first structural layer to form a first shell, including:

[0036] A fifth fiber cloth layer is laid on the upper surface of the blunt tail edge and the fourth fiber cloth layer;

[0037] Resin is vacuum-injected into the second mold and heated to cure, so that the third fiber cloth layer, the fourth fiber cloth layer, the fifth fiber cloth layer and the blunt tail edge form the first shell.

[0038] Optionally, a second shell is formed on a third mold, including:

[0039] Lay the third structural layer on the third mold;

[0040] The resin is vacuum-injected into the third mold and then heated and cured to form the second shell.

[0041] Optionally, it also includes: flipping the third mold, controlling the second and third molds to close, and bonding the first and second housings together to obtain the blade.

[0042] Furthermore, this application provides a blade, which is manufactured using the blade manufacturing method described in any of the above embodiments.

[0043] The blade manufacturing method provided in this application includes forming a blunt trailing edge on a first mold, laying a first structural layer on a second mold, placing the blunt trailing edge into the second mold, partially overlapping the blunt trailing edge with the first structural layer, laying a second structural layer on the upper surface of the blunt trailing edge and the first structural layer to form a first shell, forming a second shell on a third mold, and splicing the first shell and the second shell to form a blade. Using a separate first mold to form the blunt trailing edge structure, and then placing the blunt trailing edge into the second mold, allows for partial overlap between the blunt trailing edge and the second structural layer, preventing slippage of the blunt trailing edge and reducing the amount of adhesive used. Furthermore, the fewer layers at the blunt trailing edge position allow for faster resin flow during injection, preventing quality defects such as whitening during injection on the blunt trailing edge and shortening the blade molding cycle.

[0044] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0046] Figure 1 The diagram shown is a flowchart of a blade manufacturing method according to an exemplary embodiment of this application;

[0047] Figure 2 The diagram shown is a structural schematic of the first mold according to an exemplary embodiment of this application;

[0048] Figure 3 The diagram shown is a schematic representation of the structure of the first housing in an exemplary embodiment of this application.

[0049] Figure 4 The image shown is a cross-sectional view of the first housing in an exemplary embodiment of this application;

[0050] Figure 5 The diagram shown is a structural schematic of the second mold and the third mold of an exemplary embodiment of this application. Detailed Implementation

[0051] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0052] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper," etc., are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including," etc., mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected," "linked," etc., are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect.

[0053] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0054] This application provides a method for manufacturing a blade 1 and the blade 1 itself. The manufacturing method for the blade 1 and the blade 1 of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0055] Figure 1 The diagram shown is a flowchart of a blade manufacturing method according to an exemplary embodiment of this application. Figure 2 The diagram shown is a structural schematic of the first mold according to an exemplary embodiment of this application. Figure 3 The diagram shown is a schematic representation of the structure of the first housing in an exemplary embodiment of this application. Figure 4 The image shown is a cross-sectional view of the first housing in an exemplary embodiment of this application. Figure 5 The diagram shows the structures of the second and third molds according to an exemplary embodiment of this application. (Reference) Figures 1 to 5 This application provides a method for manufacturing a blade 1, which can be used to manufacture the blade 1. For example... Figure 1 As shown, the method includes at least the following steps:

[0056] In step 100: A blunt tail edge 3 is formed on the first mold 2. For example... Figure 2 As shown, the first mold 2 is set in the horizontal direction, and the blunt trailing edge 3 structure in the blade 1 is manufactured separately on the first mold 2.

[0057] In step 101: the first structural layer 5 is laid on the second mold 4, such as... Figure 3 As shown.

[0058] In step 102: Place the blunt tail edge 3 into the second mold 4, as follows. Figure 3 As shown.

[0059] In step 103: the blunt tail edge 3 is partially overlapped with the first structural layer 5, such as... Figure 3 and Figure 4 As shown.

[0060] In step 104: a second structural layer 6 is laid on the upper surface of the blunt tail edge 3 and the first structural layer 5 to form the first shell 7, as shown below. Figure 3 As shown. A second structural layer 6 is laid inside the second mold 4 to completely fix the blunt tail edge 3 to the first structural layer 5.

[0061] In step 105: A second shell (not shown) is formed on the third mold 8, as follows: Figure 5 As shown.

[0062] In step 106: the first shell 7 and the second shell are spliced ​​together to form the blade 1.

[0063] In the embodiments of this application, a blunt tail edge 3 structure is formed by separately laying a structural layer on the first mold 2, and then first laying a first structural layer 5 on the second mold 4, and then partially overlapping the pre-made blunt tail edge 3 with the first structural layer 5, thereby fixing the vertical blunt tail edge 3 in the second mold 4. This arrangement can prevent the blunt tail edge 3 from sliding, thereby reducing the amount of adhesive used to fix the structural layer. A second structural layer 6 is laid on the upper surface of the blunt tail edge 3 and the first structural layer 5. A vacuum is drawn into the injection cavity 20 in the second mold 4 using a vacuum device (not shown). Resin is injected into the injection cavity 20 and heated to cure to form the first shell 7. A similar method is used to make the second shell in the third mold 8, and the first shell 7 is bonded to the second shell to form the blank of the blade 1. Since the blunt tail edge 3 structure is formed separately, the number of blunt tail edge 3 structural layers in the second mold 4 is reduced, which can increase the flow rate of the injected resin, avoid quality defects such as whitening on the blunt tail edge 3, and shorten the molding cycle of the blade 1.

[0064] like Figures 2 to 4 As shown in the embodiments of this application, step 100, which involves forming a blunt tail edge 3 on the first mold 2, further includes the following steps:

[0065] In step 200: a first fiber cloth layer 30 is laid on the first mold 2.

[0066] In step 201: the core material 31 is placed horizontally on the upper part of the first fiber cloth layer 30.

[0067] In step 202: a second fiber cloth layer 32 is laid on the upper part of the core material 31.

[0068] In step 203: resin is vacuum-injected into the first mold 2 and heated to cure, so that the first fiber cloth layer 30, the core material 31 and the second fiber cloth layer 32 form a blunt tail edge 3.

[0069] A blunt tail edge 3 of a sandwich structure is obtained by sequentially laying a first fiber cloth layer 30, a core material 31, and a second fiber cloth layer 32 into the first mold 2. The core material 31 is typically a honeycomb material or foam material, which can enhance the strength of the blade 1 while maintaining its lightweight. Since the blunt tail edge 3 is located on the vertical surface of the blade 1, it is prone to slipping or falling off during the laying of the core material 31; therefore, a large amount of adhesive spray is needed to fix the core material 31 during laying. Figure 2 In the illustrated embodiment, the core material 31 can be placed horizontally using the horizontally positioned first mold 2, thus avoiding the need for adhesive spraying to fix the core material 31 during installation. This also prevents the problem of excessive adhesive application leading to a decrease in resin performance. In the blade 1, the blunt trailing edge 3 is a vertical structure. A vacuum device is used to evacuate the injection cavity 20 within the first mold 2, injecting resin into the injection cavity 20 and heating it to cure, forming the blunt trailing edge 3. Because the blunt trailing edge 3 is formed separately, the number of blunt trailing edge 3 structural layers in the second mold 4 is reduced, which increases the flow rate of the injected resin, preventing quality defects such as whitening on the blunt trailing edge 3, and also shortening the molding cycle of the blade 1.

[0070] In some embodiments, step 200 involves laying a first fiber cloth layer 30 on the first mold 2, including overlapping one end of the first fiber cloth layer 30 to a first flange platform 21 that protrudes horizontally from the edge of the first mold 2, and leaving the other end of the first fiber cloth layer 30 to form a first staggered layer 33. The first fiber cloth layer 30 is laid along the upper surface of the first flange platform 21 on one side in the tangential direction, and the other end of the first fiber cloth layer 30 is left with the first staggered layer 33. The first staggered layer 33 is used to overlap with the first structural layer 5, thereby enhancing the structural stability of the blunt trailing edge 3 and increasing the overall strength and stiffness of the blade 1.

[0071] In some embodiments, step 202 involves laying a second fiber cloth layer 32 on the upper part of the core material 31, including overlapping one end of the second fiber cloth layer 32 onto the first flange 21 and leaving the other end of the second fiber cloth layer 32 reserved to form a second staggered layer 34. The tangential side of the second fiber cloth layer 32 is laid along the upper surface of the first flange 21, and the other end of the second fiber cloth layer 32 is reserved for the second staggered layer 34. The second staggered layer 34 is used to overlap with the second structural layer 6, thereby enhancing the structural stability of the blunt trailing edge 3 and increasing the overall strength and stiffness of the blade 1.

[0072] In some embodiments, step 203 involves vacuum-injecting resin into the first mold 2 and heating and curing it to form a blunt tail edge 3 from the first fiber cloth layer 30, the core material 31, and the second fiber cloth layer 32. This includes vacuum-injecting resin into the first mold 2 and heating and curing it, after which the first fiber cloth layer 30, the core material 31, and the second fiber cloth layer 32 form the blunt tail edge 3. The first fiber cloth layer 30 and the second fiber cloth layer 32, which overlap the first flange 21, form a lifting lug located at the end of the blunt tail edge 3. The first mold 2 includes an injection cavity 20. A vacuum device is used to evacuate the injection cavity 20, and resin is injected into the injection cavity 20 and heated and cured to form the blunt tail edge 3. Vacuuming the injection cavity 20 can remove gas from the fiber cloth layer and the resin, allowing the resin to fill the fiber gaps, thereby improving the structural strength and performance of the blade 1. The first fiber cloth layer 30 and the second fiber cloth layer 32, laid on the first flange 21, form a lifting lug after heating and curing, so that the blunt tail edge 3 can be demolded and moved into the second mold 4 through the lifting lug.

[0073] exist Figure 3 In the embodiment shown, step 101, which involves laying the first structural layer 5 on the second mold 4, further includes the following steps:

[0074] In step 300: an outer skin layer 40 is laid on the second mold 4, such as... Figure 4 As shown. The outer skin layer 40 is composed of multiple layers of fiber cloth and is the main load-bearing part closest to the outermost part of the blade 1. It plays a role in stabilizing the aerodynamic shape of the blade 1, receiving wind pressure loads, preventing the blade 1 from being eroded, and stabilizing the core material 31.

[0075] In step 301: a third fiber cloth layer 41 and a fourth fiber cloth layer 42 are laid at the trailing edge corner of the outer skin layer 40 corresponding to the blade 1, such as... Figure 4 As shown. The side of the third fiber cloth layer 41 near the blunt trailing edge 3 overlaps with the bottom portion of the blunt trailing edge 3. The fourth fiber cloth layer 42 is a trailing edge corner reinforcement layer, which can increase the thickness and strength at the trailing edge corner of the blade 1 and improve the tensile strength of the blade 1 in this region.

[0076] exist Figure 4In the illustrated embodiment, step 300 involves laying the outer skin layer 40 on the second mold 4, including overlapping both ends of the outer skin layer 40 with the second flange platform 46 protruding from the upper surface of the second mold 4. This arrangement prevents the outer skin layer 40 from sliding during laying.

[0077] exist Figure 4 In the illustrated embodiment, step 301 involves laying a third fiber cloth layer 41 and a fourth fiber cloth layer 42 at the trailing edge corner of the outer skin layer 40 corresponding to the blade 1. This includes: pre-leaving a third staggered layer 43 at one end of the third fiber cloth layer 41 near the trailing edge facade of the blade 1 corresponding to the second mold 4, and overlapping the other end to the second flange platform 46 protruding from the upper surface of the second mold 4. Pre-leaving a fourth staggered layer 44 at one end of the fourth fiber cloth layer 42 near the trailing edge facade, and overlapping the other end to the second flange platform 46. When laying the third fiber cloth layer 41, a third staggered layer 43 is reserved at one end of the third fiber cloth layer 41 near the bottom of the blunt tail edge 3, and the other end is laid to the upper surface of the second flange platform 46, so that the third staggered layer 43 overlaps with the first staggered layer 33 on the pre-fabricated blunt tail edge 3, thereby enhancing the strength and stability of the overlap. When laying the fourth fiber cloth layer 42, a fourth staggered layer 44 is reserved at one end of the fourth fiber cloth layer 42 near the bottom of the blunt tail edge 3, and the other end is laid to the upper surface of the second flange platform 46, so that the fourth staggered layer 44 overlaps with the second staggered layer 34 on the pre-fabricated blunt tail edge 3, thereby enhancing the strength and stability of the overlap.

[0078] In some embodiments, step 102, placing the blunt trailing edge 3 into the second mold 4, includes: fitting a lifting lug onto the second flange 46 to fix the blunt trailing edge 3 in the second mold 4 at a position corresponding to the trailing edge elevation. The lifting lug is formed by laying a first fiber fabric and a second fiber fabric on the first flange 21 and heating and curing them. The lifting lug is used to move the heat-cured blunt trailing edge 3 into the second mold 4. Furthermore, the lifting lug can also be fitted onto the second flange 46 covered with the outer skin layer 40 to prevent the prefabricated blunt trailing edge 3 from slipping down, thus avoiding the need to use adhesive spraying to fix the blunt trailing edge 3 located on the elevation of the blade 1.

[0079] exist Figure 3 and Figure 4 In the illustrated embodiment, step 103 involves partially overlapping the blunt tail edge 3 with the first structural layer 5, including overlapping the first staggered layer 33 with the third staggered layer 43 vertically, and overlapping the second staggered layer 34 with the fourth staggered layer 44 vertically. Placing the blunt tail edge 3 into the second mold 4, with the third staggered layer 43 overlapping the first staggered layer 33 on the pre-fabricated blunt tail edge 3, and the fourth staggered layer 44 overlapping the second staggered layer 34 on the pre-fabricated blunt tail edge 3, can enhance the strength and stability of the overlap.

[0080] refer to Figure 3 and Figure 4Step 104 involves depositing a second structural layer 6 on the upper surface of the blunt tail edge 3 and the first structural layer 5 to form a first shell, including:

[0081] Step 400: Lay the fifth fiber cloth layer 45 on the upper surface of the blunt trailing edge 3 and the fourth fiber cloth layer 42. The fifth fiber cloth layer 45 is the main load-bearing part closest to the innermost side of the blade 1. It can enhance the structural strength and stiffness of the blade 1, improve its overall stability and wind load resistance, and play a role in stabilizing the core material 31.

[0082] Step 401: Vacuum-inject resin into the second mold 4 and heat-cur it to form the first shell 7 by the third fiber cloth layer 41, the fourth fiber cloth layer 42, the fifth fiber cloth layer 45, and the blunt tail edge 3. The second mold 4 includes an injection cavity 20. The injection cavity 20 is evacuated by a vacuum device, resin is injected into the injection cavity 20, and heat-cured to form the first shell 7. Vacuuming the injection cavity 20 can remove gas from the fiber cloth layers and resin, allowing the resin to fill the fiber gaps, thereby improving the structural strength and performance of the blade 1. Since the blunt tail edge 3 structure is formed separately, the number of blunt tail edge 3 structure layers in the second mold 4 is reduced, which can increase the flow rate of the injected resin, avoid quality defects such as whitening on the blunt tail edge 3, and shorten the molding cycle of the blade 1.

[0083] exist Figure 5 In the embodiment shown, step 105, which involves forming a second shell on the third mold 8, specifically includes the following steps:

[0084] In step 500, a third structural layer (not shown) is laid on the third mold 8.

[0085] In step 501, resin is vacuum-injected into the interior of the third mold 8 and then heated and cured to form the second shell.

[0086] Steps 500 and 501 are similar to the manufacturing method of the first housing 7 in the above embodiments, and will not be described again here.

[0087] Step 106 involves joining the first housing 7 and the second housing to form the blade 1. This includes flipping the third mold 8, controlling the second mold 4 and the third mold 8 to close, and bonding the first housing 7 and the second housing to obtain the blade 1. Bonding the first housing 7 and the second housing yields a blank of the blade 1. The blank of the blade 1 undergoes a post-processing step to treat its surface, ensuring a smooth surface. In some embodiments, the blade 1 may also be coated to improve its durability. This application does not limit the post-processing steps.

[0088] This application provides a blade 1, which is manufactured using the blade manufacturing method described in any of the above embodiments. A single first mold 2 is used to form the blunt tail edge 3 structure, and then the blunt tail edge 3 is placed in a second mold 4, causing the blunt tail edge 3 to partially overlap with the second structural layer 6. This prevents the blunt tail edge 3 from slipping, thereby reducing the amount of adhesive used. Furthermore, the fewer layers at the blunt tail edge 3 position allow for faster resin flow during injection, preventing quality defects such as whitening on the blunt tail edge 3 and shortening the molding cycle of the blade 1.

[0089] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0090] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for manufacturing a blade, characterized in that, include: A blunt tail edge is formed on the first mold; The first structural layer is laid on the second mold; Place the blunt tail edge into the second mold; The blunt tail edge is partially overlapped with the first structural layer; A second structural layer is laid on the blunt tail edge and the upper surface of the first structural layer to form a first shell; The second shell is formed on the third mold; The first housing and the second housing are joined together to form a blade; The blunt tail edge is formed on the first mold, including: A first fiber cloth layer is laid on the first mold; The core material is placed horizontally on top of the first fiber cloth layer; A second fiber cloth layer is laid on top of the core material; Resin is vacuum-injected into the first mold and then heated and cured to form the blunt tail edge by the first fiber cloth layer, the core material, and the second fiber cloth layer. Laying a first fiber cloth layer on the first mold includes: One end of the first fiber cloth layer is overlapped to the first flange platform that protrudes horizontally along the edge of the first mold, and the other end of the first fiber cloth layer is reserved to form a first staggered layer. A second fiber cloth layer is laid on the upper part of the core material, including: One end of the second fiber cloth layer is overlapped onto the first flange platform, and the other end of the second fiber cloth layer is reserved to form a second staggered layer. Vacuum-injecting resin into the first mold and heating to cure it, so that the first fiber cloth layer, the core material, and the second fiber cloth layer form the blunt tail edge, including: After the resin is vacuum-injected into the first mold and heated to cure, the first fiber cloth layer, the core material, and the second fiber cloth layer form the blunt tail edge. The first fiber cloth layer and the second fiber cloth layer, which overlap the first flange, form the lug located at the end of the blunt tail edge.

2. The method for manufacturing a blade according to claim 1, characterized in that, A first structural layer is laid on the second mold, including: An outer skin layer is laid on the second mold; A third and fourth fiber cloth layer are laid at the trailing edge corner of the blade corresponding to the outer skin layer.

3. The method for manufacturing the blade according to claim 2, characterized in that, Laying an outer skin layer on the second mold includes: The two ends of the outer skin layer are respectively overlapped with the second flange platform protruding from the upper surface of the second mold; and / or A third and fourth fiber cloth layer are laid at the trailing edge corner of the blade corresponding to the outer skin layer, including: The third fiber cloth layer is reserved at one end near the trailing edge of the corresponding blade of the second mold to form a third staggered layer, and the other end is overlapped to the second flange platform protruding from the upper surface of the second mold. The fourth fiber cloth layer is reserved at one end near the rear edge facade to form a fourth staggered layer, and the other end is overlapped to the second flange platform.

4. The method for manufacturing the blade according to claim 3, characterized in that, Placing the blunt tail edge into the second mold includes: The lifting lug is fitted onto the second flange platform to fix the blunt tail edge in the second mold at the position corresponding to the rear edge facade.

5. The method for manufacturing the blade according to claim 3, characterized in that, The blunt trailing edge is partially overlapped with the first structural layer, including: The first staggered layer and the third staggered layer are joined together vertically, and the second staggered layer and the fourth staggered layer are joined together vertically.

6. The method for manufacturing a blade according to claim 2, characterized in that, A second structural layer is deposited on the blunt tail edge and the upper surface of the first structural layer to form a first shell, including: A fifth fiber cloth layer is laid on the upper surface of the blunt tail edge and the fourth fiber cloth layer. Resin is vacuum-injected into the second mold and then heated and cured so that the third fiber cloth layer, the fourth fiber cloth layer, the fifth fiber cloth layer and the blunt tail edge form the first shell.

7. The method for manufacturing a blade according to claim 1, characterized in that, The second shell is formed on the third mold, including: Lay the third structural layer on the third mold; The resin is vacuum-injected into the third mold and then heated and cured to form the second shell.

8. The method for manufacturing a blade according to claim 6, characterized in that, Also includes: The third mold is flipped over, and the second mold and the third mold are controlled to close together to bond the first shell and the second shell together to obtain the blade.

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