Wind power blade mold and wind power blade manufacturing system

Abstract

The invention provides a wind power blade mold and a wind power blade manufacturing system. The wind power blade mold comprises a mold body and a plurality of plugs. One side surface of the mold body is provided with a forming surface, and the mold body is provided with a plurality of injection holes; the injection hole has a first opening and a second opening, and the first opening is located at the molding surface; the second opening is connected with an injection pipeline; the plug can move relative to the mold main body so as to be switched between a first state and a second state; in the first state, the plugs are located in the corresponding injection holes and plug the first openings of the corresponding injection holes; and in the second state, the plug opens at least part of the corresponding first opening. Thus, the resin can be poured into the mold from bottom to top, and the flowing direction of the resin is consistent with the natural floating direction of the bubbles in the laying layer, so that the bubbles can be collected above the laying layer, the probability that cavity defects occur in the wind power blade can be reduced, and the compactness and mechanical property of the wind power blade can be improved.

Description

Technical Field

[0001] This application relates to the field of blade manufacturing equipment, specifically to a wind turbine blade mold and a wind turbine blade manufacturing system. Background Technology

[0002] Wind turbine blades are mainly manufactured using a vacuum-assisted resin transfer molding process. This process includes: sequentially laying reinforcing materials, core materials, and structural components (i.e., lay-up) on the mold surface, then covering it with auxiliary materials such as a guide net and a vacuum bag film to form a sealed cavity. Next, a vacuum is drawn into the sealed cavity to create a negative pressure environment. Then, resin is injected into the mold, allowing the resin to impregnate the lay-up under negative pressure. Finally, the resin is cured and molded.

[0003] In related technologies, the "top-flow" injection method is commonly used, where resin is injected from above or to the side of the mold, relying on gravity and vacuum pressure to penetrate downwards for layering. However, in this injection method, the resin has high flow resistance, and the resin flow direction is opposite to the direction of air bubble discharge generated during injection. The resin easily entrains air bubbles or forms turbulence, leading to decreased resin flow stability. This can result in insufficient resin wetting of the layer, causing defects such as dry yarn, delamination and whitening, and air bubble aggregation, which seriously affect the structural strength of wind turbine blades. Summary of the Invention

[0004] This application provides a wind turbine blade mold and a wind turbine blade manufacturing system to solve the problems of high resistance and low stability during resin injection.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions: In a first aspect, embodiments of this application provide a wind turbine blade mold, comprising: a mold body and a plurality of plugs. One side surface of the mold body has a forming surface, and the mold body has a plurality of injection holes; each injection hole has a first opening and a second opening, the first opening being located at the forming surface; the second opening is used to connect to an injection pipeline; the plurality of plugs correspond one-to-one with the plurality of injection holes; the plugs are movable relative to the mold body to switch between a first state and a second state; in the first state, the plug is located in the corresponding injection hole and blocks the first opening of the corresponding injection hole; in the second state, the plug opens at least a portion of the corresponding first opening.

[0006] In some possible implementations of the first aspect, in the first state, the surface of the plug facing the same direction as the molding surface is flush with the area on the molding surface surrounding the corresponding first opening.

[0007] In some possible implementations of the first aspect, in the second state, at least a portion of the plug is located outside the injection hole corresponding to the plug, and the plug is spaced apart from the periphery of the corresponding first opening.

[0008] In some possible implementations of the first aspect, multiple injection holes are arranged in multiple columns along a first direction and in multiple rows along a second direction; the first direction and the second direction intersect.

[0009] In some possible implementations of the first aspect, in the first direction, the distance between any two adjacent columns of injection holes is greater than or equal to 0.5m and less than or equal to 2m; and / or, in the second direction, the distance between any two adjacent rows of injection holes is greater than or equal to 1m and less than or equal to 30m.

[0010] In some possible implementations of the first aspect, the equivalent diameter of the injection hole is greater than or equal to 5 mm and less than or equal to 50 mm.

[0011] In some possible implementations of the first aspect, the mold body has an air extraction hole located above a plurality of injection holes.

[0012] In some possible implementations of the first aspect, the mold body includes: a main body, a first flange and a second flange, the main body having a downwardly recessed groove, the groove wall defining a forming surface; the first flange and the second flange are respectively connected to the two ends of the main body along the first direction; both the first flange and the second flange are provided with air extraction holes.

[0013] In some possible implementations of the first aspect, the injection hole includes a first hole segment and a second hole segment; the first hole segment is located at the upper end of the second hole segment and is in communication with the second hole segment; the equivalent diameter of the first hole segment is greater than the equivalent diameter of the second hole segment, and a countersunk platform is formed between the first hole segment and the second hole segment; the end of the first hole segment away from the second hole segment is a first opening, and the end of the second hole segment away from the first hole segment is a second opening; in the first state, the plug is located inside the first hole segment and the plug is supported on the countersunk platform.

[0014] In some possible implementations of the first aspect, a seal is provided on the recessed platform, and the seal is arranged around the second hole segment; in the first state, the seal abuts between the plug and the recessed platform.

[0015] Secondly, embodiments of this application provide a wind turbine blade manufacturing system, including: a wind turbine blade mold and an injection module, wherein the injection module is connected to the wind turbine blade mold.

[0016] In some possible implementations of the second aspect, the injection module includes: an injection device and a vacuum pump, a main pipeline and multiple branch pipelines. The main pipeline connects the injection device and the vacuum pump; the multiple branch pipelines correspond one-to-one with multiple injection holes, and the second opening of each injection hole is connected to the main pipeline through the corresponding branch pipeline; a first switching valve and a second switching valve are provided in the main pipeline; the first switching valve is configured to control the injection device to supply material to or stop supplying material to the main pipeline; the second switching valve is configured to control the vacuum pump to connect to or disconnect from the main pipeline.

[0017] In some possible implementations of the second aspect, a third switching valve is provided in each branch pipe.

[0018] In some possible implementations of the second aspect, the injection module includes: a collection box; the collection box is connected in the main pipeline and located between the vacuum pump and the second switching valve.

[0019] In some possible implementations of the second aspect, the mold body has an air extraction hole located above multiple injection holes; the wind turbine blade manufacturing system also includes a vacuum pump connected to the air extraction hole.

[0020] The wind turbine blade mold and wind turbine blade manufacturing system provided in this application have the following beneficial effects: This application provides a wind turbine blade mold. The wind turbine blade mold includes a mold body with multiple injection holes. The first opening of each injection hole is located on the molding surface (e.g., the inner surface) of the mold body. By forming multiple injection holes in the mold body, resin can be injected into the wind turbine blade mold from below during the wind turbine blade injection process. On the one hand, multiple injection holes can inject resin simultaneously or in sections, which helps to improve the uniformity of resin distribution, thereby reducing the flow resistance of resin in the layup and improving the resin's wetting efficiency in the layup. On the other hand, the upward flow direction of the resin is consistent with the natural upward direction of air bubbles in the layup, allowing air bubbles to collect on top of the layup. This reduces the probability of voids and defects inside the wind turbine blade, which helps to improve the density and mechanical properties of the wind turbine blade. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the wind turbine blade mold structure provided in some embodiments of this application.

[0022] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the plug and injection hole of the wind turbine blade mold.

[0023] Figure 3 This is a structural diagram of a wind turbine blade manufacturing system provided in some embodiments of this application.

[0024] Figure 4This is a structural diagram of a wind turbine blade manufacturing system provided in some embodiments of this application under vacuum conditions.

[0025] Figure 5 This is a structural diagram of a wind turbine blade manufacturing system provided in some embodiments of this application under injection conditions.

[0026] Figure 6 This is a structural diagram of a wind turbine blade manufacturing system provided in some embodiments of this application under recycling conditions.

[0027] Explanation of reference numerals in the attached figures Wind turbine blade manufacturing system 1; Wind turbine blade mold 10; injection module 20; injection equipment 21; vacuum pump 22; main pipeline 23; branch pipeline 24; first switch valve 25; second switch valve 26; third switch valve 27; collection box 28; Mold body 100; forming surface 110; injection hole 120; first opening 120a; second opening 120b; first hole section 121; second hole section 122; countersunk platform 123; sealing element 124; air extraction hole 130; main body 140; countersunk groove 141; first flange 150; second flange 160; Plug 200; First support surface 200a; Second support surface 200b. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0029] In this application, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0030] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0031] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of this application, "several" means one or more, unless otherwise explicitly specified.

[0032] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0033] In the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also 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.

[0034] In the description of this application, unless otherwise expressly defined, the terms "above," "over," "on top of," "below," "below," "under," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "below," and "over" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0035] Wind turbine blades are mainly manufactured using a vacuum-assisted resin transfer molding process. This process includes: sequentially laying reinforcing materials, core materials, and structural components (i.e., lay-up) on the mold surface, then covering it with auxiliary materials such as a guide net and a vacuum bag film to form a sealed cavity. Next, a vacuum is drawn into the sealed cavity to create a negative pressure environment. Then, resin is injected into the mold, allowing the resin to impregnate the lay-up under negative pressure. Finally, the resin is cured and molded.

[0036] In related technologies, the "top-flow" injection method is commonly used, where resin is injected from above or to the side of the mold, relying on gravity and vacuum pressure to penetrate downwards for layering. However, in this injection method, the resin has high flow resistance, and the resin flow direction is opposite to the direction of air bubble discharge generated during injection. The resin easily entrains air bubbles or forms turbulence, leading to decreased resin flow stability. This can result in insufficient resin wetting of the layer, causing defects such as dry yarn, delamination and whitening, and air bubble aggregation, which seriously affect the structural strength of wind turbine blades.

[0037] To address the aforementioned problems, some embodiments of this application provide a wind turbine blade mold and a wind turbine blade manufacturing system. The wind turbine blade mold includes a mold body with multiple injection holes. The first opening of each injection hole is located on the molding surface (e.g., the inner surface) of the mold body. By forming multiple injection holes in the mold body, resin can be injected into the wind turbine blade mold from below during the wind turbine blade infusion process. On one hand, multiple injection holes allow for simultaneous or regional resin injection, which improves the uniformity of resin distribution and reduces the flow resistance of the resin in the layup, thereby increasing the resin's wetting efficiency. On the other hand, the upward flow direction of the resin coincides with the natural upward direction of air bubbles in the layup, allowing the air bubbles to collect above the layup. This reduces the probability of voids and defects inside the wind turbine blade, improving its density and mechanical properties.

[0038] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0039] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a wind turbine blade mold 10 provided in some embodiments of this application. The wind turbine blade mold 10 includes a mold body 100, one side surface of which has a forming surface 110, and the mold body 100 has a plurality of injection holes 120; the injection holes 120 have a first opening 120a and a second opening 120b, the first opening 120a being located at the forming surface 110; the second opening 120b being used to connect to an injection pipeline (such as a branch pipeline).

[0040] Thus, by forming multiple injection holes 120 in the mold body 100, resin can be injected into the wind turbine blade mold 10 from below during the wind turbine blade injection process. On the one hand, the multiple injection holes 120 can inject resin simultaneously or in sections, which helps to improve the uniformity of resin distribution, thereby reducing the flow resistance of resin in the layup and improving the resin's wetting efficiency in the layup. On the other hand, the upward flow direction of the resin is consistent with the natural upward direction of air bubbles in the layup, allowing the air bubbles to collect on top of the layup. This facilitates the removal of the collected air bubbles using vacuum equipment, thereby reducing the probability of void defects inside the wind turbine blade and improving the compactness and mechanical properties of the wind turbine blade.

[0041] In some embodiments, the equivalent diameter of the injection hole 120 is greater than or equal to 5 mm and less than or equal to 50 mm. For example, the equivalent diameter of the injection hole 120 is 5 mm, 10 mm, 20 mm, 30 mm, or 50 mm. It should be noted that the equivalent diameter of the injection hole 120 refers to the diameter of a circle with the same cross-sectional area as the injection hole 120.

[0042] Understandably, during the injection molding process of wind turbine blades, in order to avoid multiple resin streams flowing relative to each other and encasing air bubbles, thus preventing the bubbles from escaping smoothly, the injection holes 120 are usually opened in batches. For example, the injection hole 120 located in the middle of the mold body 100 is opened first, and after the resin enters the mold through the middle injection hole 120 and fully impregnates the layers, the outer injection holes 120 are then opened.

[0043] In this case, the unopened injection hole 120 (i.e., the injection hole 120 that does not participate in the injection of resin) will cause pits on part of the surface of the molding surface 110, which may increase the flow resistance of the resin flowing through it and may reduce the smoothness of the outer surface of the molded wind turbine blade.

[0044] To resolve this technical issue, please refer to [link / reference]. Figure 2 , Figure 2 for Figure 1 The diagram shows a cross-sectional view of the plug 200 and injection hole 120 of the wind turbine blade mold 10.

[0045] The wind turbine blade mold 10 also includes multiple plugs 200, each plug 200 corresponding to a multiple injection hole 120; the plugs 200 are movable relative to the mold body 100 to switch between a first state and a second state; in the first state (i.e. Figure 2 In the first state, the plug 200 is located in the corresponding injection hole 120 and blocks the first opening 120a of the corresponding injection hole 120; in the second state, the plug 200 opens at least a portion of the corresponding first opening 120a.

[0046] Thus, by setting multiple plugs 200 corresponding one-to-one with multiple injection holes 120, and the plugs 200 being movable relative to the mold body 100, it is possible to seal the first opening 120a of the other part of the injection holes 120 when some injection holes 120 are open and others are closed (i.e., not involved in resin injection). This can prevent pits (i.e., injection holes 120) from appearing on part of the surface of the molding surface 110, and can improve the flatness of the molding surface 110 to a certain extent, which is beneficial to improving the smoothness of the flow of the injection material, and thus beneficial to improving the flatness of the outer surface of the wind turbine blade.

[0047] In some embodiments, such as Figure 2 As shown, in the first state, the surface of the plug 200 that faces the same direction as the molding surface 110 is flush with the area on the molding surface 110 surrounding the corresponding first opening 120a.

[0048] Specifically, the plug 200 has a first support surface 200a and a second support surface 200b that are opposite each other along the thickness direction of the mold body 100. The first support surface 200a is flush with the area on the molding surface 110 surrounding the corresponding first opening 120a.

[0049] Thus, with some injection holes 120 open and others closed, the flatness of the molding surface 110 can be further improved, the smoothness of the injection material flow can be improved, and the flatness of the outer surface of the wind turbine blade can be improved.

[0050] In some embodiments, in the second state, at least a portion of the plug 200 is located outside the injection hole 120 corresponding to the plug 200, and the plug 200 is spaced apart from the periphery of the corresponding first opening 120a to form an injection channel for resin flow, so that the resin can be injected into the wind turbine blade mold 10.

[0051] In some embodiments, such as Figure 2 As shown, the plug 200 can be a platform adapted to the inner contour of the injection hole 120, and the area of ​​the first support surface 200a is larger than the area of ​​the second support surface 200b. This increases the distance between the plug 200 and the periphery of the corresponding first opening 120a in the second state, thereby increasing the flow area (i.e., cross-sectional area) of the injection channel, reducing the resistance to resin injection, and increasing the resin flow rate.

[0052] For example, if injection hole 120 is a round hole, then plug 200 is a frustum.

[0053] For example, if the injection hole 120 is a square hole, then the plug 200 is a truncated square.

[0054] In some embodiments, the plug 200 is made of one or more of nylon, polyethylene, polypropylene, or polytetrafluoroethylene. It is understood that materials made of nylon, polyethylene, polypropylene, and polytetrafluoroethylene have poor adhesion to resin, thus facilitating separation from the wind turbine blade after resin curing.

[0055] In some embodiments, such as Figure 1 As shown, multiple injection holes 120 are arranged in multiple columns along the first direction X and in multiple rows along the second direction Y; the first direction X and the second direction Y intersect. This is beneficial to improving the uniformity of the distribution of the multiple injection holes 120 in the mold body 100, and thus to improving the uniformity of the distribution of the injected resin.

[0056] In some embodiments, in the first direction X, the distance between any two adjacent rows of injection holes 120 is greater than or equal to 0.5m and less than or equal to 2m. For example, in the first direction X, the distance between any two adjacent rows of injection holes 120 is 0.5m, 0.75m, 1.0m, 1.5m or 2.0m.

[0057] In some embodiments, in the second direction Y, the distance between any two adjacent rows of injection holes 120 is greater than or equal to 1m and less than or equal to 30m. For example, in the second direction Y, the distance between any two adjacent rows of injection holes 120 is 1m, 5m, 10m, 15m or 30m.

[0058] In some embodiments, such as Figure 1 As shown, the mold body 100 has an air extraction hole 130, which is located above the plurality of injection holes 120. In other words, the air extraction hole 130 is higher than the plurality of injection holes 120 along the direction of gravity. It can be understood that during the infusion molding process of wind turbine blades, air bubbles in the layup will converge upwards. Therefore, by placing the air extraction hole 130 above the plurality of injection holes 120, it is convenient to extract the converged air bubbles through the air extraction hole 130, which helps to improve the reliability of wind turbine blade infusion.

[0059] In some embodiments, such as Figure 1 As shown, the mold body 100 includes: a body portion 140, a first flange 150, and a second flange 160. The body portion 140 has a downwardly recessed groove 141, the groove wall of which defines a molding surface 110; the first flange 150 and the second flange 160 are respectively connected to the two ends of the body portion 140 along a first direction; both the first flange 150 and the second flange 160 are provided with air extraction holes 130.

[0060] Thus, by placing the air extraction hole 130 on the first flange 150 and the second flange 160, the air extraction hole 130 can be located above the multiple injection holes 120, which facilitates the extraction of collected air bubbles through the air extraction hole 130 and helps to improve the reliability of wind turbine blade injection.

[0061] In some examples, the bottom wall of the sink 141 may define the forming surface 110, which is recessed downwards. In other examples, the bottom wall and the side wall of the sink 141 may jointly define the forming surface 110. In this case, the bottom wall and the side wall can be transitioned by an arc surface, that is, there may be no obvious dividing line or dividing structure between the bottom wall and the side wall.

[0062] In some embodiments, such as Figure 2 As shown, the injection hole 120 includes a first hole segment 121 and a second hole segment 122; the first hole segment 121 is located at the upper end of the second hole segment 122 and communicates with the second hole segment 122; the equivalent diameter of the first hole segment 121 is larger than the equivalent diameter of the second hole segment 122, and a recessed platform 123 is formed between the first hole segment 121 and the second hole segment 122; the end of the first hole segment 121 away from the second hole segment 122 is a first opening 120a, and the end of the second hole segment 122 away from the first hole segment 121 is a second opening 120b; in a first state, the plug 200 is located inside the first hole segment 121, and the plug 200 is supported on the recessed platform 123. Specifically, the second support surface 200b of the plug 200 is supported on the recessed platform 123.

[0063] Thus, by setting up the recessed platform 123 and supporting the second support surface 200b of the plug 200 on the recessed platform 123, it is easy to make the first support surface 200a of the plug 200 flush with the area around the corresponding first opening 120a on the forming surface 110 in the first state.

[0064] Some embodiments of this application also provide a wind turbine blade manufacturing system 1, please refer to [link / reference]. Figure 3 , Figure 3 This is a structural diagram of a wind turbine blade manufacturing system 1 provided in some embodiments of this application. The wind turbine blade manufacturing system 1 includes: a wind turbine blade mold 10 as described in any of the above embodiments and an injection module 20, the injection module 20 being connected to the wind turbine blade mold 10. The injection module 20 is used to inject resin into the wind turbine blade mold 10.

[0065] In some embodiments, such as Figure 3As shown, the injection module 20 includes an injection device 21, a vacuum pump 22, a main pipeline 23, and multiple branch pipelines 24. The main pipeline 23 connects the injection device 21 and the vacuum pump 22. Each branch pipeline 24 corresponds to a specific injection port 120, and the second opening 120b of each injection port 120 is connected to the main pipeline 23 via the corresponding branch pipeline 24. A first switching valve 25 and a second switching valve 26 are provided in the main pipeline 23; the first switching valve 25 is configured to control the injection device 21 to supply material to or stop supplying material to the main pipeline 23; the second switching valve 26 is configured to control the connection or disconnection between the vacuum pump 22 and the main pipeline 23. Thus, by providing the first switching valve 25 and the second switching valve 26, independent control of the injection device 21 and the vacuum pump 22 can be achieved, and mutual interference between the injection device 21 and the vacuum pump 22 can be avoided, thereby improving the reliability of the wind turbine blade manufacturing system 1.

[0066] In some embodiments, such as Figure 3 As shown, each branch pipe 24 is equipped with a third switching valve 27. In this way, the on / off state of multiple branch pipes 24 can be independently controlled by multiple third switching valves 27, thereby independently controlling the opening or closing of multiple injection holes 120, thus enabling batch injection of resin.

[0067] In some embodiments, such as Figure 3 As shown, the injection module 20 includes a collection tank 28. The collection tank 28 is connected to the main pipeline 23 and is located between the vacuum pump 22 and the second switching valve 26. Thus, after injection, the vacuum pump 22 can draw the residual resin in the main pipeline 23 and the multiple branch pipelines 24 into the collection tank 28, thereby preventing the resin from solidifying in the pipeline, improving the pipeline's unobstructed flow, and enabling resin recovery, which helps reduce waste and save costs.

[0068] In some embodiments, the wind turbine blade manufacturing system 1 further includes a vacuum device connected to an air extraction port 130 to extract air from the mold before and during resin injection.

[0069] In some embodiments, such as Figure 2 As shown, a sealing element 124 is provided on the recessed platform 123, and the sealing element 124 is arranged around the second hole section 122; in the first state, the sealing element 124 abuts between the plug 200 and the recessed platform 123.

[0070] Some embodiments of this application also provide a method for manufacturing a wind turbine blade, which is performed using the wind turbine blade manufacturing system of any of the above embodiments. The manufacturing method includes steps S10 to S100.

[0071] In step S10, multiple injection holes 120 are sealed by multiple plugs 200.

[0072] For example, multiple plugs 200 are all in the first state, and a seal 124 is provided on the recess 123 of each injection hole 120. Each plug 200 is sealed to the recess 123 through the seal 124.

[0073] For example, seal 124 is a rubber ring.

[0074] In step S20, a release agent is applied to the molding surface 110, and a flow-guiding fabric is laid.

[0075] It is understandable that a release agent is applied to the molding surface 110 to facilitate demolding after the wind turbine blades have cured. The flow-guiding fabric can guide the injected resin, thereby ensuring that the injected resin evenly impregnates the layup.

[0076] For example, multiple rows of flow-guiding fabric are placed along the second direction Y, with each row of flow-guiding fabric corresponding to a row of injection holes 120, and each row of flow-guiding fabric covering the corresponding row of injection holes 120.

[0077] For example, the flow-guiding fabric includes continuous felt and / or chopped strand mat. The flow-guiding fabric uses a specification of 300 g / m. 2 Or 600g / m 2 The width of the flow-guiding fabric is greater than or equal to 50 mm and less than or equal to 300 mm. Furthermore, depending on actual needs, one or more layers of the flow-guiding fabric can be laid.

[0078] In step S30, according to the design of the wind turbine blade, materials such as fiberglass cloth, pultruded plate, core material, metal parts and prefabricated parts are laid on the forming surface 110 to form a layup.

[0079] In step S40, auxiliary materials such as release cloth, release film, flow guide net, breathable felt, one-way breathable membrane, sealing strip and vacuum bag film are arranged on the mold body 100 with layers.

[0080] For example, a receiving space is defined between the vacuum bag film and the forming surface 110, and the vacuum bag film and the forming surface 110 are sealed together by a sealing strip to create a sealed environment within the receiving space. The receiving space is in communication with the air extraction port 130.

[0081] In step S50, the first switch valve 25 is closed, the second switch valve 26 and multiple third switch valves 27 are opened, and the vacuum pump 22 is started to extract air from the main pipeline 23 and multiple branch pipelines 24.

[0082] Please see Figure 4 , Figure 4This is a structural diagram of the wind turbine blade manufacturing system 1 provided in some embodiments of this application under vacuum conditions. After the vacuum pump 22 is started and the air in the main pipeline 23 and multiple branch pipelines 24 is extracted, the main pipeline 23 and multiple branch pipelines 24 are under negative pressure. Under the action of negative pressure, the plug 200 abuts against the seal 124 on the platform 123 to prevent air in the containment space from entering the branch pipelines 24.

[0083] In step S60, the vacuum pumping device is activated, and the vacuum pumping device extracts air from the containment space through the air extraction port 130.

[0084] It is understood that vacuum equipment can remove air from the containment space, as well as at least some of the air in the layup. During the vacuuming process, the pressure needs to be maintained for a preset time, and the vacuum pressure in the containment space should not decrease significantly before the vacuuming equipment is stopped and preparations are made for resin infusion.

[0085] In step S70, the first switch valve 25 is opened, the second switch valve 26 is closed, and at least some of the plurality of third switch valves 27 are opened as needed, and the injection device 21 is started to inject adhesive into the receiving space.

[0086] Please see Figure 5 , Figure 5 This is a structural diagram of the wind turbine blade manufacturing system 1 provided in some embodiments of this application under the injection condition. Based on step S70, when a third switching valve 27 is opened, resin will enter the injection hole 120 from the injection device 21 along the main pipeline 24 and the branch pipeline 24 corresponding to the third switching valve 27. Then, the resin can push up the plug 200 so that an injection channel is formed between the plug 200 and the periphery of the first opening 120a. The resin can enter the receiving space through the injection channel and impregnate the layup in the receiving space.

[0087] It should be noted that during the entire resin injection process, the multiple third switch valves 27 can be opened in batches according to actual needs, or a portion of the multiple third switch valves 27 can remain closed, or all the third switch valves 27 can be opened at once.

[0088] In some examples, the multiple injection holes 120 can be divided into multiple rows arranged along the first direction X. During the resin injection process, the third switch valve 27 corresponding to at least one row of injection holes 120 located in the middle is first opened, allowing the resin to flow along the guide fabric (e.g., the guide fabric is arranged along the second direction Y), and then along the width direction of the wind turbine blade mold 10 (i.e., the first direction X). After the flow front of the resin passes over the unopened adjacent row of injection holes 120 (e.g., 50mm to 300mm), the third switch valve 27 corresponding to the adjacent row of injection holes 120 is opened, and so on, until the resin permeates the entire layup. In this way, the situation of multiple resin flows in opposite directions can be avoided, which is beneficial to improving the efficiency and success rate of bubble removal, and thus improving the structural strength of the wind turbine blade.

[0089] In step S80, after the infusion is completed, the first switch valve 25 is closed, the second switch valve 26 and multiple third switch valves 27 are opened, and the vacuum pump 22 is started to extract the residual resin in the main pipeline 23 and multiple branch pipelines 24.

[0090] Please see Figure 6 , Figure 6 This is a structural diagram of the wind turbine blade manufacturing system 1 provided in some embodiments of this application under recycling conditions. A collection tank 28 is connected between the vacuum pump 22 and the second switching valve 26. Resin remaining in the main pipeline 23 and multiple branch pipelines 24 extracted by the vacuum pump 22 can be collected in the collection tank 28 for use in subsequent wind turbine blade manufacturing. In this way, resin curing in the pipeline can be avoided, pipeline unobstructed flow can be improved, and resin recycling can be achieved, which helps to reduce waste and save costs.

[0091] In some examples, multiple third switching valves 27 can be closed after the vacuum pump 22 has removed the residual resin from the main pipeline 23 and multiple branch pipelines 24.

[0092] In step S90, the resin is cured and then the auxiliary materials are removed to obtain the blade shell.

[0093] For example, curing processes include: room temperature curing, heat curing, and light curing.

[0094] In step S100, the prefabricated web and blade shell are assembled to obtain the wind turbine blade.

[0095] For example, the web and blade shell can be assembled by bonding to obtain a wind turbine blade.

[0096] It should be noted that wind turbine blades manufactured based on this method can prevent the formation of structural defects such as bubbles, which is beneficial to improving structural strength and surface smoothness.

[0097] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0098] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0099] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0100] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wind turbine blade mold (10), characterized in that, include: A mold body (100) has a molding surface (110) on one side surface and a plurality of injection holes (120). Each injection hole (120) has a first opening (120a) and a second opening (120b). The first opening (120a) is located at the molding surface (110), and the second opening (120b) is used to connect to an injection pipeline. Multiple plugs (200) are provided, each corresponding to one of the injection holes (120). Each plug (200) is movable relative to the mold body (100) to switch between a first state and a second state. In the first state, the plug (200) is located in the corresponding injection hole (120) and blocks the first opening (120a) of the corresponding injection hole (120). In the second state, the plug (200) opens at least a portion of the corresponding first opening (120a).

2. The wind turbine blade mold (10) according to claim 1, characterized in that, In the first state, the surface of the plug (200) that faces the same direction as the molding surface (110) is flush with the area on the molding surface (110) surrounding the corresponding first opening (120a).

3. The wind turbine blade mold (10) according to claim 1, characterized in that, In the second state, at least a portion of the plug (200) is located outside the injection hole (120) corresponding to the plug (200), and the plug (200) is spaced apart from the periphery of the corresponding first opening (120a).

4. The wind turbine blade mold (10) according to claim 1, characterized in that, The plurality of injection holes (120) are arranged in multiple columns along the first direction and in multiple rows along the second direction; Wherein, the first direction intersects with the second direction.

5. The wind turbine blade mold (10) according to claim 4, characterized in that, In the first direction, the distance between any two adjacent columns of the injection holes (120) is greater than or equal to 0.5m and less than or equal to 2m; and / or, In the second direction, the distance between any two adjacent rows of injection holes (120) is greater than or equal to 1m and less than or equal to 30m.

6. The wind turbine blade mold (10) according to claim 1, characterized in that, The equivalent diameter of the injection hole (120) is greater than or equal to 5 mm and less than or equal to 50 mm.

7. The wind turbine blade mold (10) according to claim 1, characterized in that, The mold body (100) has an air extraction hole (130) located above the plurality of injection holes (120).

8. The wind turbine blade mold (10) according to claim 7, characterized in that, The mold body (100) includes: The body portion (140) has a downwardly recessed groove (141), the groove wall of which defines the molding surface (110). The first flange (150) and the second flange (160) are respectively connected to the two ends of the main body (140) along the first direction. The first flange (150) and the second flange (160) are both provided with the air extraction hole (130).

9. The wind turbine blade mold (10) according to claim 1, characterized in that, The injection hole (120) includes a first hole segment (121) and a second hole segment (122); the first hole segment (121) is located at the upper end of the second hole segment (122) and communicates with the second hole segment (122); the equivalent diameter of the first hole segment (121) is greater than the equivalent diameter of the second hole segment (122), and a countersunk platform (123) is formed between the first hole segment (121) and the second hole segment (122); the end of the first hole segment (121) away from the second hole segment (122) is the first opening (120a), and the end of the second hole segment (122) away from the first hole segment (121) is the second opening (120b). In the first state, the plug (200) is located within the first hole segment (121), and the plug (200) is supported on the sinking platform (123).

10. The wind turbine blade mold (10) according to claim 9, characterized in that, A sealing element (124) is provided on the recessed platform (123), and the sealing element (124) is arranged around the second hole section (122); In the first state, the seal (124) abuts between the plug (200) and the recess (123).

11. A wind turbine blade manufacturing system (1), characterized in that, include: Wind turbine blade mold (10) according to any one of claims 1-10; Injection module (20), which is connected to the wind turbine blade mold (10).

12. The wind turbine blade manufacturing system (1) according to claim 11, characterized in that, The injection module (20) includes: Injection device (21) and vacuum pump (22); Main pipeline (23) is connected between the injection device (21) and the vacuum pump (22); Multiple branch pipes (24) are provided, and each of the multiple branch pipes (24) corresponds to a multiple injection hole (120). The second opening (120b) of each injection hole (120) is connected to the main pipe (23) through the corresponding branch pipe (24). The main pipeline (23) is equipped with a first switching valve (25) and a second switching valve (26). The first switching valve (25) is configured to control the injection device (21) to supply or stop supplying material to the main pipeline (23); The second switching valve (26) is configured to control the vacuum pump (22) to be connected to or disconnected from the main pipeline (23).

13. The wind turbine blade manufacturing system (1) according to claim 12, characterized in that, Each of the branch pipes (24) is provided with a third switch valve (27).

14. The wind turbine blade manufacturing system (1) according to claim 12, characterized in that, The injection module (20) includes a collection box (28); the collection box (28) is connected in the main pipeline (23) and is located between the vacuum pump (22) and the second switching valve (26).

15. The wind turbine blade manufacturing system (1) according to claim 11, characterized in that, The mold body (100) has an air extraction hole (130) located above the plurality of injection holes (120); The wind turbine blade manufacturing system (1) further includes a vacuum pumping device, which is connected to the air extraction port (130).

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