Forming die for a blade root preform

Abstract

This application discloses a molding die for a blade root preform. The molding die includes a first mold body and a second mold body. The second mold body is detachably abutted against the first mold body along a predetermined direction, and together with the first mold body, forms a closed molding cavity. The molding cavity extends around a reference axis by a predetermined angle to mold a blade root preform extending around the central axis of the blade root by a predetermined angle; wherein the predetermined angle is less than or equal to 90°. The technical solution provided by this application can reduce the workload of adjusting the shape of the molding cavity.

Description

Technical Field

[0001] This application relates to the field of wind turbine blade manufacturing technology, and in particular to a molding die for a blade root preform. Background Technology

[0002] A wind turbine blade consists of a connected blade root and a main body. Bolt sleeves are embedded within the blade root to connect it to the wind turbine hub. Forces acting on the main body are transmitted to the hub through the blade root. Pre-fabricated blade root components must be prepared before manufacturing the blades.

[0003] In manufacturing blade root preforms, multiple bolt sleeves and other components are placed in predetermined positions in the preform molding die, and then cast to form a single piece. When producing blade root preforms of different specifications, the inner wall of the molding cavity is usually cut or supplemented to adjust the shape of the molding cavity.

[0004] The existing molds for forming blade root preforms produce semi-cylindrical preforms. The inner wall area of ​​the forming cavity is large, resulting in a significant workload when adjusting the shape of the forming cavity. Utility Model Content

[0005] The purpose of this application is to provide a molding die for a leaf root preform, which reduces the workload of adjusting the shape of the molding cavity.

[0006] To achieve the above objectives, this application provides a molding die for a blade root preform. The molding die includes a first mold body and a second mold body. The second mold body is detachably abutted against the first mold body along a predetermined direction and together with the first mold body, forms a closed molding cavity. The molding cavity extends around a reference axis by a predetermined angle to form a blade root preform extending around the central axis of the blade root by a predetermined angle. The predetermined angle is less than or equal to 90°.

[0007] Optionally, the predetermined angle is less than or equal to 15° and greater than or equal to 4°.

[0008] Optionally, the first mold body has a molding groove recessed in a predetermined direction, the molding groove having a bottom wall and a peripheral side wall connected to and surrounding the bottom wall; the second mold body includes a first main body and a boss protruding from the first main body in a predetermined direction, the first main body being separably abutting against the first mold body in the predetermined direction, the boss being inserted into the molding groove in the predetermined direction and sealingly engaging with the peripheral side wall, the protrusion height of the boss being less than the recess depth of the molding groove, and the boss having a top wall disposed opposite to the bottom wall in the predetermined direction; wherein, the portion of the top wall, the bottom wall, and the peripheral side wall located between the top wall and the bottom wall together encloses a molding cavity.

[0009] Optionally, the bottom wall extends at a predetermined angle around the reference axis to form the inner peripheral wall of the blade root preform on its radially inner side; the top wall extends at a predetermined angle around the reference axis to form the outer peripheral wall of the blade root preform on its radially outer side.

[0010] Optionally, the first mold body includes a second main body, an insert, and fasteners. The first main body and the second main body are detachably abutted in a predetermined direction, and the second main body forms a bottom wall. The insert is disposed on the second main body and is detachable from the second main body in the opposite direction of the predetermined direction. The insert and the second main body together form a peripheral sidewall. The portion of the insert forming the peripheral sidewall has a positioning portion for limiting engagement with a bolt sleeve in the leaf root preform to limit the position of the bolt sleeve on the insert. Fasteners are used to detachably connect the bolt sleeve to the insert.

[0011] Optionally, the positioning part is a positioning groove, which is recessed in the extension direction of the reference axis to accommodate one end of the bolt sleeve; the insert has a mounting hole at the bottom of the positioning groove that extends in the extension direction of the reference axis, and the fastener passes through the mounting hole and is used for threaded connection with the bolt sleeve.

[0012] Optionally, the second main body has a first groove and a second groove recessed in a predetermined direction. The first groove forms an opening at one end in the extension direction of the reference axis and communicates with the second groove through the opening. The insert is embedded in the second groove. The inner wall surface of the first groove forms a bottom wall and a portion of the peripheral sidewall. The surface of the insert that is open to the first groove through the opening forms the remaining portion of the peripheral sidewall.

[0013] Optionally, the cross-section of the insert gradually decreases along the predetermined direction, using a plane perpendicular to the predetermined direction as the cutting plane.

[0014] Optionally, the molding die also includes a pusher, which is threadedly engaged with an insert so that the pusher can rotate to adjust its position in a predetermined direction, thereby pushing against the second main body.

[0015] Optionally, both the first and second molds are rigid, and / or both the first and second molds have fluid channels.

[0016] The technical solution described in this application has the following advantages over the prior art:

[0017] The technical solution provided in this application significantly reduces the inner wall area of ​​the forming cavity by limiting the predetermined angle of the forming cavity extending around the reference axis to less than or equal to 90°. In actual production, when it is necessary to adjust the shape of the forming cavity to adapt to blade root preforms of different specifications, the smaller inner wall area means less material needs to be cut or supplemented, effectively reducing the workload of adjusting the shape of the forming cavity.

[0018] Furthermore, the reduced predetermined angle results in less variation in the shape of the forming cavity when switching to produce a different specification of blade root preform. This means that when adjusting the shape of the forming cavity, it is not necessary to make significant changes to the forming mold; only some minor adjustments are needed to meet the requirements of the new specification, effectively reducing the workload of adjusting the shape of the forming cavity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of a wind turbine blade;

[0021] Figure 2 The blades in the related technology Figure 1 Cross-sectional view at point E1-E1;

[0022] Figure 3 yes Figure 2 A three-dimensional structural schematic diagram of the blade root prefabricated component shown in the diagram;

[0023] Figure 4 It is manufacturing Figure 3 A three-dimensional structural schematic diagram of the fiberglass mold for the leaf root preform shown.

[0024] Figure 5 This is a three-dimensional structural schematic diagram of a molding die in one embodiment of this application;

[0025] Figure 6 yes Figure 5 Sectional view E2-E2 in the middle;

[0026] Figure 7 yes Figure 5 Sectional view E3-E3 in the middle;

[0027] Figure 8 Is adopted Figure 5 A three-dimensional structural diagram of the leaf root preform produced by the molding die shown.

[0028] Figure 9 yes Figure 8 Sectional view E4-E4 in the middle;

[0029] Figure 10 The blade is made from a blade root preform produced by a molding die according to an embodiment of this application. Figure 1 Cross-sectional view at position E1-E1;

[0030] Figure 11 yes Figure 5 The exploded 3D view of the molding die shown.

[0031] Figure 12 yes Figure 5 A schematic diagram of the mold closing process shown;

[0032] Figure 13 yes Figure 5 A three-dimensional exploded view of the first mold body in the mold shown;

[0033] Figure 14 yes Figure 5 The diagram shows a schematic of the structure in which the bolt sleeve is fixed to the insert in the molding die.

[0034] Figure 15 yes Figure 5 A schematic diagram showing the insert in the molding die causing the leaf root preform to separate from the second main body;

[0035] Figure 16 yes Figure 14 A sectional view showing a portion;

[0036] Figure 17 yes Figure 11 Sectional view of E5-E5, showing a portion;

[0037] Figure 18 yes Figure 11 Sectional view of section E6-E6, showing a portion;

[0038] Figure 19 yes Figure 5 Sectional view of E7-E7.

[0039] Explanation of reference numerals in the attached figures:

[0040] 10-Blade; 110-Blade root; 120-Body; 140-Outer skin; 130-Blade root preform; 131-Inner peripheral wall; 132-Outer peripheral wall; 133-First side wall; 134-Second side wall; 135-First end wall; 136-Second end wall; 150-Inner skin; 160-Blade root preform; 161-Outer fabric layer; 162-Bolt sleeve; 163-Inner fabric layer; 170a-First half-shell; 170b-Second half-shell;

[0041] 20-Molding die; 210-First mold body; 211-Second main body; 212-Insert; 2121-Positioning groove; 2122-Mounting hole; 2123-Mounting groove; 2124-First outer wall surface; 2125-Second outer wall surface; 2126-Third outer wall surface; 2127-Fourth outer wall surface; 213-Fastener; 214-Push-back part; 215-Positioning nest; 220-Second mold body; 221-First main body; 222-Boss; 223-Top wall; 230-Molding cavity; 231-First molding surface; 232-Second molding surface; 233-Second molding surface; 234-Fourth molding surface; 235-Fifth molding surface; 236-Sixth molding surface; 240-Molding groove; 241-Bottom wall; 242-Side wall; 250-First groove; 260-Second groove; 270-Opening; 281-Injection channel; 282-Airflow channel; 283-Fluid channel; 291-Second seal; 292-First guide; 293-Second guide; 294-Mold closing locking nut; 295-Mold closing locking bolt; 296-Mold opening ejection bolt;

[0042] 30 - Fiberglass mold;

[0043] F1 - Predetermined direction; θ - Predetermined angle; L1 - Central axis; L2 - Reference axis. Detailed Implementation

[0044] Please see Figure 1 , Figure 1 This is a three-dimensional structural diagram of the blade 10 of a wind turbine.

[0045] The blade 10 of the wind turbine includes a blade root 110 and a body 120 connected together. A bolt sleeve 162 is embedded within the blade root 110 (see...). Figure 3 The blade is connected to the hub of the wind turbine (not shown) via bolt sleeve 162. The force exerted on the body 120 is transmitted to the hub through the blade root 110.

[0046] Please see Figure 2 , Figure 2 The blade 10 in the related technology Figure 1 Cross-sectional view at E1-E1.

[0047] Manufacturing process of blade 10: The first half-shell 170a and the second half-shell 170b are formed separately by the main mold (the forming mold of blade 10), and then the first half-shell 170a and the second half-shell 170b are fastened together. In the main mold, the outer skin 140, the blade root preform 160 and the inner skin 150 are stacked in sequence, and then cast to form an integral part, that is, the first half-shell 170a or the second half-shell 170b.

[0048] The blade root 110 has a basically circular cross-section. In related technologies, the blade root preform 160 produced by the molding die of the blade root preform 160 is semi-cylindrical. When manufacturing the blade 10, two blade root preforms 160 are joined together to form a cylindrical shape, forming the main structural body of the blade root 110.

[0049] Please see Figure 3 , Figure 3 yes Figure 2 A three-dimensional structural schematic diagram of the blade root preform 160 in the blade 10 shown.

[0050] Before manufacturing the blade 10, the blade root preform 160 needs to be prepared in advance.

[0051] In manufacturing the blade root preform 160, multiple bolt sleeves 162 and other components are arranged in predetermined positions in the molding die of the blade root preform 160, and then cast to form an integral part. Specifically, in the circumferential direction (circumferential direction of the blade root 110) of the blade root preform 160, a filler (not shown) is sandwiched between the bolt sleeves 162. In the radial direction (circumferential direction of the blade root 110) of the blade root preform 160, an outer fabric layer 161 is laid on the outside of the bolt sleeves 162, and an inner fabric layer 163 is laid on the inside of the bolt sleeves 162. Resin is poured into the molding cavity of the molding die, so that the resin fills the gaps between the components. After the resin cures, the blade root preform 160 is formed.

[0052] Please see Figure 4 , Figure 4 It is manufacturing Figure 3 A three-dimensional structural schematic diagram of the fiberglass mold 30 for the leaf root preform 160 shown.

[0053] In related technologies, the molding die for the blade root preform 160 includes a fiberglass mold 30, a steel frame (not shown), and a vacuum bag film (not shown). The shape of the fiberglass mold 30 matches the shape of the blade root preform 160, and it is generally semi-cylindrical. The steel frame is used to support the fiberglass mold 30 to give it sufficient structural strength. The vacuum bag film covers the molding surface of the fiberglass mold 30 to form a molding cavity with the fiberglass mold 30, and the blade root preform 160 is molded by vacuum infusion.

[0054] When switching to produce a different specification of blade root preform 160, the molding surface of the fiberglass mold 30 needs to be cut or supplemented to adjust the shape of the molding cavity to match the blade root preform 160 to be produced. In related technologies, the blade root preform 160 rotates approximately 180° around the central axis L1, and the molding surface of the fiberglass mold 30 matches it, resulting in a large molding surface area and a large workload when adjusting the shape of the molding cavity.

[0055] This application provides a molding die for a blade root preform (hereinafter referred to as the molding die) that produces smaller blade root preforms with smaller molding cavities, thereby reducing the workload of adjusting the shape of the molding cavity.

[0056] The embodiments of this application are described below.

[0057] Please see Figures 5 to 7 , Figure 5 This is a three-dimensional structural schematic diagram of the molding die 20 in one embodiment of this application. Figure 6 yes Figure 5 Sectional view E2-E2 in the middle, Figure 7 yes Figure 5 Sectional view E3-E3 (illustrated only).

[0058] The molding die 20 includes a first mold body 210 and a second mold body 220. The second mold body 220 is detachably abutted against the first mold body 210 along a predetermined direction F1, and together with the first mold body 210, forms a closed molding cavity 230. The molding cavity 230 extends by a predetermined angle θ around a reference axis L2 to form a blade root preform 130 extending by a predetermined angle θ around the central axis L1 of the blade root 110 (see...). Figure 8 , Figure 9 (The predetermined angle θ is less than or equal to 90°).

[0059] The molding die 20 has an open state and a closed state. In the closed state, the first mold body 210 and the second mold body 220 abut each other to form a closed molding cavity 230. In the open state, the first mold body 210 and the second mold body 220 separate, and the molding cavity 230 is open to facilitate the placement of the bolt sleeve 162 and other components, as well as to facilitate the removal of the blade root preform 130.

[0060] After the bolt sleeve 162 and other components are placed in the molding cavity 230 according to the predetermined positions, resin is poured into the molding cavity 230 to fill the gaps between the components. After the resin cures, the blade root preform 130 is formed. Therefore, the molding cavity 230 is a closed structure to prevent resin overflow. In addition, it is easier to create a negative pressure environment within the molding cavity 230, thereby ensuring that the resin fully fills the gaps. The molding die 20 of this application is different from the molding die of the pultrusion process.

[0061] The molding cavity 230 has a first molding surface 231, a second molding surface 232, a third molding surface 233, a fourth molding surface 234, a fifth molding surface 235, and a sixth molding surface 236. The first molding surface 231 and the second molding surface 232 extend about a reference axis L2 by a predetermined angle θ and are radially opposite to each other along the reference axis L2. The third molding surface 233 and the fourth molding surface 234 are circumferentially opposite to each other along the reference axis L2. The third molding surface 233 connects the first molding surface 231 and the second molding surface 232. The plane containing the third molding surface 233 passes through the reference axis L2. The fourth molding surface 234 connects the first molding surface 231 and the second molding surface 232. The plane containing the fourth molding surface 234 passes through the reference axis L2. The fifth molding surface 235 and the sixth molding surface 236 are symmetrically opposite to each other along the extension direction of the reference axis L2. The fifth molding surface 235 connects the first molding surface 231, the second molding surface 232, the third molding surface 233, and the fourth molding surface 234. The sixth molding surface 236 is connected between the first molding surface 231, the second molding surface 232, the third molding surface 233 and the fourth molding surface 234.

[0062] Please refer to the following: Figure 8 and Figure 9 , Figure 8 Is adopted Figure 5 A three-dimensional structural schematic diagram of the blade root preform 130 produced by the molding die 20 shown. Figure 9 yes Figure 8 Sectional view E4-E4 in the diagram.

[0063] The blade root preform 130 extends about a central axis L1 by a predetermined angle θ. The outer surface of the blade root preform 130 has an inner peripheral wall 131, an outer peripheral wall 132, a first side wall 133, a second side wall 134, a first end wall 135, and a second end wall 136. The inner peripheral wall 131 and the outer peripheral wall 132 extend about the central axis L1 by a predetermined angle θ and are arranged radially opposite to each other along the central axis L1. The first side wall 133 and the second side wall 134 are arranged circumferentially opposite to each other along the central axis L1. The first side wall 133 connects the inner peripheral wall 131 and the outer peripheral wall 132. The second side wall 134 connects the inner peripheral wall 131 and the outer peripheral wall 132. The first end wall 135 and the second end wall 136 are arranged axially opposite to each other along the extension direction of the central axis L1. The first end wall 135 connects the inner peripheral wall 131, the outer peripheral wall 132, the first side wall 133, and the second side wall 134. The second end wall 136 is connected between the inner peripheral wall 131, the outer peripheral wall 132, the first side wall 133, and the second side wall 134. Specifically, the first molding surface 231 is used to mold the inner peripheral wall 131, the second molding surface 232 is used to mold the outer peripheral wall 132, the third molding surface 233 is used to mold the first side wall 133, the fourth molding surface 234 is used to mold the second side wall 134, the fifth molding surface 235 is used to mold the first end wall 135, and the sixth molding surface 236 is used to mold the second end wall 136.

[0064] Please see Figure 10 , Figure 10 The blade 10 is made from the blade root preform 130 produced using the molding die 20 provided in one embodiment of this application. Figure 1 Cross-sectional view at position E1-E1.

[0065] In the main mold, the outer skin 140 is first laid out, then multiple blade root preforms 130 are arranged sequentially around the central axis L1 and placed on the outer skin 140. Next, the inner skin 150 is covered on the multiple blade root preforms 130, and then injection molding is performed to obtain a single piece, i.e., the first half-shell 170a or the second half-shell 170b. Figure 10 In the middle, the predetermined angle θ is 90°, and both the first half shell 170a and the second half shell 170b have two blade root preforms 130.

[0066] In the first half-shell 170a or the second half-shell 170b, the more blade root preforms 130 there are, the smaller the predetermined angle θ will be.

[0067] In some embodiments, the blade root preforms 130 in the first half-shell 170a or the second half-shell 170b have the same specifications. The first half-shell 170a or the second half-shell 170b is manufactured using blade root preforms 130 produced from the same shaped cavity 230, meaning that the predetermined angle θ of each blade root preform 130 is the same. For example, the number of blade root preforms 130 in the first half-shell 170a or the second half-shell 170b can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, ..., 84 or 85. The predetermined angle θ can be 90°, 60°, 45°, 36°, 30°, 25.7°, 22.5°, 20°, 18°, 16.4°, 15°, 13.8°, 12.9°, 12°, 11.25°, 10.6°, 10°, ..., 2.2° or 2.1°.

[0068] In other embodiments, the specifications of the blade root preforms 130 in the first half-shell 170a or the second half-shell 170b are different. The first half-shell 170a or the second half-shell 170b is manufactured using blade root preforms 130 produced from molding cavities 230 of different specifications; that is, there are blade root preforms 130 with different predetermined angles θ. In some embodiments, the first half-shell 170a includes 10 blade root preforms 130 with a predetermined angle θ of 12° and 20 blade root preforms 130 with a predetermined angle θ of 3°.

[0069] Please continue reading. Figure 6 In the inner wall surface of the molded cavity 230, the first molding surface 231 and the second molding surface 232 occupy the largest area. Reducing the predetermined angle θ can significantly reduce the area of ​​the first molding surface 231 and the second molding surface 232, thereby significantly reducing the area of ​​the inner wall surface of the molded cavity 230.

[0070] In a detection scenario, the predetermined angle θ of the molding cavity 230 is obtained by measuring the predetermined angle θ corresponding to different positions of the first molding surface 231 in the extension direction of the reference axis L2 and taking the average value.

[0071] In a detection scenario, the predetermined angle θ of the molded cavity 230 is obtained by measuring the predetermined angle θ corresponding to different positions of the second molding surface 232 in the extension direction of the reference axis L2 and taking the average value.

[0072] In a detection scenario, the predetermined angle θ of the molding cavity 230 is obtained by measuring the predetermined angle θ of the first molding surface 231 and the second molding surface 232 respectively and taking the average value.

[0073] In a detection scenario, the predetermined angle θ of the molding cavity 230 is obtained by measuring the included angle between the third molding surface 233 and the fourth molding surface 234 at different positions along the extension direction of the reference axis L2 and taking the average value.

[0074] In traditional blade root preform molding dies, the predetermined angle θ of the molding cavity extending around the reference axis L2 is 180°, resulting in a large inner wall area. Adjusting the shape requires cutting or adding material to this large inner wall surface. This application, however, significantly reduces the inner wall area of ​​the molding cavity 230 by limiting the predetermined angle θ of the molding cavity 230 extending around the reference axis L2 to less than or equal to 90°. In actual production, when the shape of the molding cavity 230 needs to be adjusted to fit different specifications of blade root preforms 130, a smaller inner wall area means less material needs to be cut or added. This directly reduces processing time, lowers processing difficulty, and thus improves production efficiency. It also reduces potential errors during processing and enhances product quality stability.

[0075] Secondly, when producing blade root preforms 130 of different specifications, the shape of the forming cavity in traditional molds varies greatly, requiring significant time and effort for replanning and operation each time. In this application, the predetermined angle θ is reduced, thus reducing the shape variation of the forming cavity 230 when switching to producing another specification of blade root preform 130. This means that when adjusting the shape of the forming cavity 230, no major modifications to the forming mold 20 are needed; only some local fine-tuning is required to meet the requirements of the new specification. This fine-tuning operation not only saves time but also reduces the risks that may arise from large-scale mold adjustments, such as mold structure damage and difficulty in ensuring accuracy. At the same time, the smaller shape variation also makes it easier to control and adjust process parameters during production, helping to improve product consistency and pass rate, further increasing production efficiency and reducing production costs.

[0076] Furthermore, in the traditional mold for forming blade root preforms, the predetermined angle θ of the forming cavity extending around the reference axis is 180°, resulting in blade root preforms that occupy a large area and are inconvenient for large-scale storage and transportation.

[0077] In summary, this application effectively reduces the workload of adjusting the shape of the molding cavity 230, and also facilitates the storage and transportation of the blade root preform 130.

[0078] In related technologies, pultrusion molding is used to manufacture blade root preforms, where each preform contains only one bolt sleeve 162. When manufacturing the first half-shell 170a or the second half-shell 170b of the blade 10, a large number of blade root preforms must be placed because the required number of bolt sleeves 162 is fixed. This not only significantly increases the workload of placement but also makes precise positioning of numerous blade root preforms difficult to control in actual operation, easily leading to placement deviations and affecting the subsequent forming quality of the blade 10.

[0079] The molding die 20 of this application can embed multiple bolt sleeves 162 in a blade root preform 130. This improvement reduces the number of blade root preforms 130 required to be placed when manufacturing the first half-shell 170a or the second half-shell 170b, effectively reducing operational complexity while improving placement accuracy.

[0080] However, the size of the predetermined angle θ has a dual impact on production. A smaller predetermined angle θ does indeed reduce the workload of adjusting the shape of the forming cavity 230 when switching between producing different specifications of blade root preforms 130, making mold adjustments more convenient. But at the same time, a smaller predetermined angle θ limits the number of bolt sleeves 162 that can be embedded in the blade root preform 130. This results in a need to place a larger number of blade root preforms 130 when manufacturing the first half-shell 170a or the second half-shell 170b, again presenting the problem of difficulty in controlling placement accuracy and increased workload.

[0081] To find the optimal balance between reducing the workload of mold adjustment and ensuring the number of bolt sleeves 162 embedded, in some embodiments, the predetermined angle θ is limited to a range of less than or equal to 15° and greater than or equal to 4°. Practical verification has shown that when the predetermined angle θ is greater than or equal to 4°, at least two bolt sleeves 162 can be embedded in the blade root preform 130, satisfying both production efficiency and precision requirements while also achieving convenient mold adjustment. Specifically, the number of bolt sleeves 162 embedded in the blade root preform 130 is 2, 3, 4, 5, 6, or 7. Specifically, the predetermined angle θ can be 4°, 4.2°, 6.4°, 8.5°, 10.6°, 12.7°, 14.8°, or 15°.

[0082] The specific structure of the molding die 20 is described in detail below.

[0083] Please see Figure 11 and Figure 12 , Figure 11 yes Figure 5 The three-dimensional exploded view of the molding die 20 shown. Figure 12 yes Figure 5 The diagram shows the mold closing process of the molding die 20.

[0084] The first mold body 210 is a concave mold, and the second mold body 220 is a convex mold. The concave mold and the convex mold cooperate to form a molding cavity 230.

[0085] Specifically, the first mold body 210 has a molding groove 240 recessed in a predetermined direction F1. The molding groove 240 has a bottom wall 241 and a peripheral sidewall 242 connected to and surrounding the bottom wall 241. The second mold body 220 includes a first main body 221 and a boss 222 protruding from the first main body 221 in the predetermined direction F1. The first main body 221 is detachably abutted against the first mold body 210 along the predetermined direction F1. The boss 222 is inserted into the molding groove 240 in the predetermined direction F1 and is sealed with the peripheral sidewall 242. The protrusion height of the boss 222 is less than the recess depth of the molding groove 240. The boss 222 has a top wall 223 disposed opposite to the bottom wall 241 in the predetermined direction F1. The portion of the top wall 223, the bottom wall 241, and the peripheral sidewall 242 located between the top wall 223 and the bottom wall 241 together form a molding cavity 230.

[0086] When the molding die 20 is in the open state, the top of the molding groove 240 is open towards the second mold body 220. When the molding die 20 is in the closed state, the boss 222 blocks the top of the molding groove 240, so that the bottom of the molding groove 240 forms a molding cavity 230.

[0087] The boss 222 is inserted into the molding groove 240 in a predetermined direction F1. The tight contact between the boss 222 and the peripheral wall 242 reduces the gap between them. When the boss 222 and the peripheral wall 242 are sealed together, on the one hand, their physical contact forms the first barrier, preventing the injected resin from overflowing from the top of the molding groove 240; on the other hand, the sealing design creates a relatively closed space inside the molding groove 240, creating conditions for the subsequent formation of a negative pressure environment.

[0088] In some embodiments, the bottom wall 241 extends about the reference axis L2 by a predetermined angle θ to form the inner peripheral wall 131 of the blade root preform 130 on its radially inner side. The top wall 223 extends about the reference axis L2 by a predetermined angle θ to form the outer peripheral wall 132 of the blade root preform 130 on its radially outer side.

[0089] Specifically, the bottom wall 241 forms the first molding surface 231 described above, the top wall 223 forms the second molding surface 232 described above, and the portion of the peripheral wall 242 located between the top wall 223 and the bottom wall 241 forms the third molding surface 233, the fourth molding surface 234, the fifth molding surface 235, and the sixth molding surface 236 described above.

[0090] In this embodiment, a posture of the blade root preform 130 in the molding die 20 is provided, which facilitates demolding. Specifically, the top wall 223 is used to form the outer peripheral wall 132, which is the largest wall surface of the blade root preform 130. The outer peripheral wall 132 and the top wall 223 are separated by separating the first mold body 210 and the second mold body 220. In addition, the outer contour of the blade root preform 130 gradually shrinks inward along the predetermined direction F1, so that the blade root preform 130 can be separated from the first mold body 210 in the opposite direction of the predetermined direction F1.

[0091] In some embodiments, the cross-sectional size of the forming groove 240 is gradually reduced from top to bottom, with a plane perpendicular to the predetermined direction F1 as the cutting surface.

[0092] The boss 222 matches the shape of the forming groove 240. Correspondingly, with a plane perpendicular to the predetermined direction F1 as the cutting surface, the cross-sectional size of the forming groove 240 gradually increases from top to bottom. This arrangement creates a "wedge-like" effect when the forming mold 20 is closed. As the boss 222 is inserted into the forming groove 240, due to the gradual change in their cross-sectional dimensions, the boss 222 generates compressive stress in the radial direction against the peripheral wall 242 of the forming groove 240. This compressive stress causes the boss 222 to fit tightly against the peripheral wall 242, effectively filling any tiny gaps that may exist between them.

[0093] Please see Figures 13 to 15 , Figure 13 yes Figure 5 The exploded three-dimensional view of the first mold body 210 in the molding die 20 is shown. Figure 14 yes Figure 5 The diagram shows the structure of the bolt sleeve 162 fixed to the insert 212 in the molding die 20. Figure 15 yes Figure 5 The schematic diagram shows how the insert 212 in the molding die 20 drives the leaf root preform 130 to separate from the second main body 211. Figure 15 Only a portion of the second main body section 211 is shown.

[0094] In some embodiments, the first mold body 210 includes a second main body portion 211, an insert 212, and a fastener 213. The first main body portion 211 and the second main body portion 211 are detachably abutted in a predetermined direction F1, and the second main body portion 211 forms a bottom wall 241. The insert 212 is disposed on the second main body portion 211 and is detachable from the second main body portion 211 in the opposite direction of the predetermined direction F1. The insert 212 and the second main body portion 211 together form a peripheral sidewall 242. The portion of the insert 212 forming the peripheral sidewall 242 has a positioning portion for limiting engagement with a bolt sleeve 162 in the leaf root preform 130 to define the position of the bolt sleeve 162 on the insert 212. The fastener 213 is used to detachably connect the bolt sleeve 162 to the insert 212.

[0095] Specifically, there are multiple positioning parts, each corresponding to a bolt sleeve 162 in the blade root preform 130, with each positioning part engaging with its corresponding bolt sleeve 162. The arrangement of the multiple positioning parts corresponds to the arrangement of the bolt sleeves 162 in the blade root preform 130. Similarly, there are multiple fasteners 213, each corresponding to a bolt sleeve 162, with each fastener 213 detachably connecting its corresponding bolt sleeve 162 to the insert 212.

[0096] When the molding die 20 is in the open state, the insert 212 is removed from the second main body 211, the bolt sleeve 162 is fitted with the corresponding positioning part, and then the corresponding fastener 213 is used to connect it to the insert 212. The insert 212 together with the bolt sleeve 162 is placed on the second main body 211, so that the bolt sleeve 162 is in the molding groove 240 according to the predetermined position. The molding die 20 is switched to the closed state, and resin is filled into the molding cavity 230. After the resin has cured, the molding die 20 is switched to the open state. The insert 212 is separated from the second main body 211 in the opposite direction of the predetermined direction F1. At the same time, the insert 212 drives the blade root preform 130 to separate from the second main body 211. The connection and limiting fit between the insert 212 and the bolt sleeve 162 in the blade root preform 130 are released, and the blade root preform 130 is obtained.

[0097] Multiple positioning parts correspond one-to-one with the bolt sleeve 162, and their arrangement strictly matches the design requirements of the blade root preform 130. Through physical obstruction and constraint, the freedom of the bolt sleeve 162 within the molding cavity 230 is limited. When the bolt sleeve 162 is embedded in the positioning part, the shape and size of the positioning part fit tightly with the bolt sleeve 162, like a dedicated "groove" made for the bolt sleeve 162. This prevents displacement due to the impact or buoyancy generated by the flow of resin during the resin injection process, ensuring that the bolt sleeve 162 remains in the predetermined position. At the same time, the fastener 213 detachably connects the bolt sleeve 162 to the insert 212, further enhancing the positioning effect. Through mechanical fastening force, the bolt sleeve 162 is firmly fixed, forming a double protection mechanism.

[0098] After the resin has cured, when the mold is opened, the insert 212 separates from the second main body 211 in the opposite direction of the predetermined direction F1. Since the bolt sleeve 162 is tightly connected to the insert 212, the insert 212 can pull the blade root preform 130 away from the second main body 211 during the release process. As a "traction component", the insert 212 evenly transmits the demolding force to the blade root preform 130, avoiding the risk of damage to the preform caused by uneven local force in traditional demolding methods. In addition, the separation direction of the insert 212 is consistent with the demolding direction of the blade root preform 130, which conforms to the mechanical trend of demolding, reduces demolding resistance, and makes the demolding process smoother.

[0099] Through the above scheme, the insert 212 limits the bolt sleeve 162, so that the bolt sleeve 162 can be in a predetermined position in the molding cavity 230. At the same time, it can also assist the demolding of the blade root preform 130.

[0100] Please see Figure 16 , Figure 16 yes Figure 14 A sectional view showing a portion.

[0101] In some embodiments, the positioning part is a positioning groove 2121, which is recessed in the extension direction of the reference axis L2 to accommodate one end of the bolt sleeve 162. The insert 212 has a mounting hole 2122 extending in the extension direction of the reference axis L2 at the bottom of the positioning groove 2121. The fastener 213 passes through the mounting hole 2122 and is used for threaded connection with the bolt sleeve 162.

[0102] Specifically, the shape and size of the positioning groove 2121 are matched with the end of the bolt sleeve 162. After the end of the bolt sleeve 162 is inserted into the positioning groove 2121, its position relative to the insert 212 is defined.

[0103] Specifically, the fastener 213 is a bolt, which is inserted into the bolt sleeve 162 and connected to the bolt sleeve 162.

[0104] In some other embodiments, the positioning part may also be a positioning protrusion (not shown), which is inserted into the bolt sleeve 162 to limit the engagement with the bolt sleeve 162.

[0105] In some embodiments, a mounting groove 2123 is provided at the bottom of the positioning groove 2121, and the mounting groove 2123 is arranged around the mounting hole 2122. The molding die 20 also includes a first seal (not shown), which is embedded in the mounting groove 2123 and sandwiched between the bolt sleeve 162 and the insert 212 in the extending direction of the reference axis L2.

[0106] In some embodiments, the molding die 20 further includes a positioning nest 215. The positioning nest 215 is disposed within the mounting hole 2122 and sleeved over the fastener 213 to limit the fastener 213, thereby further enhancing the limiting effect on the bolt sleeve 162.

[0107] Please see Figure 13 In some embodiments, the second main body portion 211 has a first groove 250 and a second groove 260 recessed in a predetermined direction F1. The first groove 250 forms an opening 270 at one end in the extension direction of the reference axis L2 and communicates with the second groove 260 through the opening 270. The insert 212 is embedded in the second groove 260. The inner wall surface of the first groove 250 forms a bottom wall 241 and a portion of a peripheral sidewall 242. The remaining portion of the peripheral sidewall 242 is formed by the surface of the insert 212 that is open to the first groove 250 through the opening 270.

[0108] Specifically, the inner wall surface of the first groove 250 is formed with the first molding surface 231, the third molding surface 233, the fourth molding surface 234, and the sixth molding surface 236, respectively. The insert 212 forms a fifth molding surface 235 through the surface of the opening 270 facing the first groove 250.

[0109] Specifically, the second groove 260 has a greater recess depth in the predetermined direction F1 than the first groove 250 in the predetermined direction F1, such that the bottom of the second groove 260 is lower than the bottom of the first groove 250 in the predetermined direction F1. The circumferential dimension of the second groove 260 along the reference axis L2 is greater than the circumferential dimension of the first groove 250 along the reference axis L2. The inner wall surface of the second groove 260 on the side of the opening 270 is U-shaped. After the insert 212 is embedded in the second groove 260, its outer surface can better seal the opening 270.

[0110] Please see Figure 17 and Figure 18 , Figure 17 yes Figure 11 Sectional view of E5-E5 (partial view shown). Figure 18 yes Figure 11 Sectional view of section E6-E6 (partial view shown).

[0111] In some embodiments, the cross-section of the insert 212 gradually decreases along the predetermined direction F1, with a plane perpendicular to the predetermined direction F1 as the cutting plane.

[0112] Specifically, the insert 212 includes a first outer wall surface 2124, a second outer wall surface 2125, a third outer wall surface 2126, and a fourth outer wall surface 2127. The first outer wall surface 2124 and the second outer wall surface 2125 are arranged opposite to each other in the extension direction of the reference axis L2. The third outer wall surface 2126 is connected between the first outer wall surface 2124 and the second outer wall surface 2125. The fourth outer wall surface 2127 is connected between the first outer wall surface 2124 and the second outer wall surface 2125. The third outer wall surface 2126 and the fourth outer wall surface 2127 are arranged opposite to each other. The first outer wall surface 2124, the third outer wall surface 2126, and the fourth outer wall surface 2127 are respectively inclined relative to a predetermined direction F1, and gradually inclined inward along the predetermined direction F1. The second outer wall surface 2125 is parallel to the predetermined direction F1 and is used to form the aforementioned fifth molding surface 235.

[0113] This configuration allows the insert 212 to have a certain draft angle, which, when combined with the second groove 260, improves the positional accuracy of the insert 212 on the second main body 211.

[0114] Please see Figure 13 In some embodiments, the molding die 20 further includes a pusher 214, which is threadedly engaged with the insert 212 so that the pusher 214 can rotate to adjust its position in a predetermined direction F1, thereby pushing against the second body portion 211.

[0115] Specifically, the pusher 214 is a bolt, which passes through the insert 212 and is threadedly engaged with it. The axis of the pusher 214 is parallel to a predetermined direction F1. By tightening the pusher 214, it pushes against the second main body 211, thereby causing the insert 212 to disengage from the second main body 211 in the opposite direction of the predetermined direction F1.

[0116] Please see Figure 6 and Figure 19 , Figure 19 yes Figure 5 Sectional view of E7-E7.

[0117] In some embodiments, both the first mold body 210 and the second mold body 220 are rigid. This configuration allows for positive pressure injection of resin into the molding cavity 230, thereby shortening the resin injection time and improving production efficiency.

[0118] In some other embodiments, the first mold 210 is rigid, and the second mold 220 is a vacuum bag film, into which resin is injected using a vacuum injection method into the molding cavity 230.

[0119] In some embodiments, the first mold body 210 has an injection channel 281 and an airflow channel 282. The injection channel 281 communicates with the molding cavity 230 and is used to inject resin into the molding channel. The airflow channel 282 communicates with the molding cavity 230 and is used to connect to a vacuum pump to expel air from the molding cavity 230. In other embodiments, the injection channel 281 and the airflow channel 282 may also be provided in the second mold body 220.

[0120] In some embodiments, the first mold 210 and the second mold 220 are further provided with fluid channels 283, which are used to contain a high-temperature medium and guide it to flow along a predetermined path to heat and mold the object within the cavity 230. In other embodiments, heating elements (e.g., heating resistors) may be embedded in the first mold 210 and the second mold 220 to replace the high-temperature medium. The first mold 210 and the second mold 220 have a heating function, which can reduce the curing time of the resin adhesive and improve production efficiency.

[0121] Please see Figure 11 In some embodiments, the molding die 20 further includes a second seal 291 disposed on the first mold body 210. When the molding die 20 is in the closed state, the second seal 291 is sandwiched between the first mold body 210 and the second mold body 220 to improve sealing.

[0122] In some embodiments, the first mold 210 is provided with a first guide portion 292, and the second mold 220 is provided with a second guide portion 293. The first guide portion 292 and the second guide portion 293 cooperate to guide the first mold 210 and the second mold 220 to move relative to each other in a predetermined direction F1. Specifically, the first guide portion 292 is a guide groove recessed in the predetermined direction F1, and the second guide portion 293 is a guide protrusion protruding in the predetermined direction F1.

[0123] In some embodiments, the molding die 20 further includes a mold clamping nut 294 and a mold clamping bolt 295. The mold clamping nut 294 is disposed on the first mold body 210, and the mold clamping bolt 295 is disposed on the second mold body 220. The mold clamping nut 294 and the mold clamping bolt 295 are threaded together to detachably connect the first mold body 210 and the second mold body 220, such that the second mold body 220 abuts against the first mold body 210 in a predetermined direction F1.

[0124] In some embodiments, the molding die 20 further includes an ejector bolt 296. The axis of the ejector bolt 296 is parallel to a predetermined direction F1 and is threaded to the second mold body 220. By turning the ejector bolt 296, its position in the predetermined direction F1 is adjusted, thereby pushing against the first mold body 210, and thus causing the second mold body 220 to separate from the first mold body 210 in the opposite direction of the predetermined direction F1.

[0125] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0126] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0127] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0128] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0129] 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 molding die for a leaf root preform, characterized in that, include: First motif; as well as The second mold body is detachably abutted against the first mold body in a predetermined direction, and together with the first mold body, they form a closed molding cavity. The molding cavity extends at a predetermined angle around a reference axis to form the blade root preform extending at the predetermined angle around the central axis of the blade root. Wherein, the predetermined angle is less than or equal to 90°.

2. The molding die according to claim 1, characterized in that, The predetermined angle is less than or equal to 15° and greater than or equal to 4°.

3. The molding die according to claim 1, characterized in that, The first mold body has a molding groove recessed in the predetermined direction, the molding groove having a bottom wall and a peripheral side wall connected to the bottom wall and surrounding the bottom wall; The second mold body includes a first main body and a boss protruding from the first main body in the predetermined direction. The first main body is detachably abutted against the first mold body in the predetermined direction. The boss is inserted into the molding groove in the predetermined direction and is sealed with the peripheral sidewall. The protrusion height of the boss is less than the recess depth of the molding groove. The boss has a top wall that is disposed opposite to the bottom wall in the predetermined direction. The top wall, the bottom wall, and the peripheral side wall located between the top wall and the bottom wall together form the molded cavity.

4. The molding die according to claim 3, characterized in that, The bottom wall extends at the predetermined angle around the reference axis to form the inner peripheral wall of the blade root preform on its radially inner side; the top wall extends at the predetermined angle around the reference axis to form the outer peripheral wall of the blade root preform on its radially outer side.

5. The molding die according to claim 3, characterized in that, The first phantom includes: The second main body portion is detachably abutted against the first main body portion and the second main body portion in the predetermined direction, and the second main body portion forms the bottom wall; An insert is disposed on the second main body portion and is capable of disengaging from the second main body portion in the opposite direction of the predetermined direction. The insert and the second main body portion together form the peripheral sidewall. The portion of the insert forming the peripheral sidewall has a positioning portion for engaging with a bolt sleeve in the leaf root preform to limit the position of the bolt sleeve on the insert. Fasteners for detachably attaching the bolt sleeve to the insert.

6. The molding die according to claim 5, characterized in that, The positioning part is a positioning groove, which is recessed in the extension direction of the reference axis to accommodate one end of the bolt sleeve; The insert has a mounting hole extending through the reference axis at the bottom of the positioning groove, and the fastener passes through the mounting hole and is used to connect with the bolt by thread.

7. The molding die according to claim 5, characterized in that, The second main body has a first groove and a second groove recessed in the predetermined direction. The first groove forms an opening at one end in the extension direction of the reference axis and communicates with the second groove through the opening. The insert is embedded in the second groove. The inner wall surface of the first groove forms the bottom wall and a portion of the peripheral sidewall, and the surface of the insert that opens toward one side of the first groove through the opening forms the remaining portion of the peripheral sidewall.

8. The molding die according to claim 7, characterized in that, Using a plane perpendicular to the predetermined direction as the cutting plane, the cross-section of the insert gradually decreases along the predetermined direction.

9. The molding die according to claim 7, characterized in that, The molding die also includes: A pusher, which is threadedly engaged with the insert, allows the pusher to rotate to adjust its position in the predetermined direction, thereby pushing against the second main body portion.

10. The molding die according to any one of claims 1-9, characterized in that, Both the first mold and the second mold are rigid; and / or both the first mold and the second mold have fluid channels.

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