Blade mold closing and glue applying structure and wind turbine generator

Abstract

The application provides a blade mold closing and gluing structure and a wind turbine generator set, and relates to the technical field of wind power generation. The application comprises a pressure surface shell and a suction surface shell; an adhesive member is arranged between the pressure surface shell and the suction surface shell; an adhesive area is formed on one side of at least one of the pressure surface shell and the suction surface shell facing the adhesive member, and the adhesive area has a concave adhesive surface; an adhesive layer is laid on the concave adhesive surface; during mold closing of the pressure surface shell and the suction surface shell, the adhesive member and the adhesive layer start to contact from the middle area, and the contact and extrusion area between the adhesive member and the adhesive layer expands from the middle area to both sides as the mold closing proceeds. The application changes the gluing position and limits the contact process expanding from the middle to both sides, avoids the two sides of the adhesive area from closing the air discharge path in advance, reduces the possibility of air retention, cavitation and local glue deficiency of complex adhesive areas such as L-shaped and C-shaped adhesive areas, and improves the adhesive quality and the stability of the adhesion.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, specifically to a blade molding and coating structure and a wind turbine generator set. Background Technology

[0002] Wind turbine blades typically consist of a pressure side (PS) and a suction side (SS), which are molded together and bonded together using structural adhesive to form the entire blade. For some large blades with blunt trailing edges, the local bonding surface forms complex bonding areas such as L-shaped and C-shaped regions.

[0003] However, during the mold closing process, due to the presence of complex surfaces such as concave and sloping surfaces in the aforementioned areas, the structural adhesive can easily trap air within the bonding area after contacting the bonding surfaces. Furthermore, the trapped air is difficult to expel with the pressure of the structural adhesive, resulting in problems such as air bubbles or localized missing adhesive. Summary of the Invention

[0004] In view of this, this application provides a blade molding and adhesive coating structure to improve bonding quality. Furthermore, this application also provides a wind turbine blade including the above-mentioned blade molding and adhesive coating structure. To achieve the above objectives, this application provides the following technical solution: This application provides a blade mold-forming and adhesive-coating structure, including: Pressure surface housing and suction surface housing; An adhesive component is disposed between the pressure surface housing and the suction surface housing; An adhesive region is formed on the side of at least one of the pressure surface housing and the suction surface housing facing the adhesive member, and the adhesive region has a concave adhesive surface; An adhesive layer is laid on the concave adhesive surface; During the mold closing process of the pressure surface housing and the suction surface housing, the adhesive component and the adhesive layer begin to contact from the middle region, and the contact and compression area between the adhesive component and the adhesive layer expands from the middle region to both sides as the mold closing progresses.

[0005] Optionally, in the above-described blade mold-coating structure, the adhesive layer has a protruding portion protruding towards the adhesive member on one side, and the protruding portion has a first convex surface facing the adhesive member.

[0006] Optionally, in the above-mentioned blade mold coating structure, the adhesive layer has a first side and a second side opposite to each other, and the adhesive layer has an inclined surface on the side facing the adhesive member. The inclined surface extends from the first side toward the central region of the adhesive layer, and the thickness of the adhesive layer gradually increases along the direction from the first side toward the central region to form the protruding portion.

[0007] Optionally, in the above-described blade mold coating structure, the protruding portion extends from the central region toward the second side, and the surface of the protruding portion facing the adhesive member forms the first convex surface.

[0008] Optionally, in the above-described blade mold-coating structure, the side of the adhesive member facing the adhesive layer includes a central pressing portion, and the central pressing portion protrudes toward the adhesive layer relative to both sides of the adhesive member, so that the surface of the central pressing portion facing the adhesive layer forms a second convex surface.

[0009] Optionally, in the above-mentioned blade mold coating structure, the bonding area is an L-shaped bonding area, the concave bonding surface is formed on the pressure surface housing, and the bonding member is a trailing edge pad or a trailing edge bonding angle.

[0010] Optionally, in the above-mentioned blade mold coating structure, the bonding area is a C-shaped bonding area, the concave bonding surface is formed on the suction surface shell, and the bonding member is a bonding angle.

[0011] Optionally, in the above-mentioned blade mold coating structure, the adhesive layer is a structural adhesive layer.

[0012] Optionally, in the above-mentioned blade mold coating structure, the adhesive member has an exhaust guide groove on the side facing the adhesive layer. The exhaust guide groove extends from the middle region of the adhesive member to at least one side of the adhesive member to form an exhaust port on the side of the adhesive member.

[0013] This application provides a blade clamping and adhesive coating structure, including a pressure surface shell, a suction surface shell, an adhesive region, and an adhesive layer on the blade. At least one of the pressure surface shell and the suction surface shell forms an adhesive region on the side facing the adhesive member. This adhesive region has a concave adhesive surface facing the adhesive member, formed by the corresponding shell itself being recessed in a direction away from the adhesive member. The adhesive layer is laid on the concave adhesive surface. As clamping continues, the clamping load is transferred to the adhesive layer through the central contact area, causing the adhesive layer to be compressed starting from the central area. The contact compression area between the adhesive member and the adhesive layer gradually expands from the central area to both sides as the clamping stroke continues. During this expansion process, air located in front of the contact area is gradually pushed to the uncontacted areas on both sides and discharged from both sides. Simultaneously, the adhesive layer spreads to both sides under the compression action and fills the space between the adhesive member and the concave adhesive surface.

[0014] Compared to directly applying structural adhesive to the rear edge pad or bonding corner and creating a closed air area during mold closing, this application changes the adhesive application location and limits the contact process from the center to both sides. This avoids the air venting path being closed off on both sides of the bonding area beforehand, thereby reducing the possibility of air trapping, cavitation, and localized adhesive shortage in complex bonding areas such as L-shaped and C-shaped areas. It also allows the adhesive material to be fully squeezed and filled under the mold closing load, improving the bonding quality and stability.

[0015] This application also provides a wind turbine generator set, including blades, and the blades have the blade molding and adhesive coating structure described above. Since the blades of the wind turbine generator set provided in this application have the aforementioned blade molding and adhesive coating structure, they possess all the technical effects of the aforementioned blade molding and adhesive coating structure, and will not be elaborated further herein. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the blade molding and adhesive coating structure disclosed in the embodiments of this application.

[0017] Figure 2 This is a schematic diagram of the blade molding and adhesive coating structure disclosed in another embodiment of this application.

[0018] Explanation of icon numbers: 100 represents the pressure surface shell; 200 is the suction surface shell; 300 is the bonding area; 400 is the adhesive layer, 410 is the bevel, and 420 is the first convex surface. 500 is an adhesive component. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] like Figures 1-2As shown, one embodiment of this application provides a blade molding and adhesive coating structure. The blade of a wind turbine generator includes a pressure surface housing 100 and a suction surface housing 200. The pressure surface housing 100 is a PS surface housing, and the suction surface housing 200 is an SS surface housing. The two are molded together relative to each other during the blade manufacturing process. An adhesive member 500 is disposed between the pressure surface housing 100 and the suction surface housing 200, and is used to participate in forming an adhesive connection between the housings after the two housings are molded together. At least one of the pressure surface housing 100 and the suction surface housing 200 forms an adhesive region 300 on the side facing the adhesive member 500. The adhesive region 300 has a concave adhesive surface facing the adhesive member 500. The concave adhesive surface is a surface formed by the housing itself being recessed in a direction away from the adhesive member 500, and is not a separately installed independent component.

[0021] Before mold closing, adhesive material is laid on the concave adhesive surface to form an adhesive layer 400, with one side of the adhesive layer 400 bearing the weight of the concave adhesive surface and the other side facing the adhesive component 500. As mold closing continues, the closing load is transferred to the adhesive layer 400 through the central contact area, causing the adhesive layer 400 to be compressed starting from the central area. The contact compression area between the adhesive component 500 and the adhesive layer 400 gradually expands from the central area to both sides as the mold closing stroke progresses. During this expansion process, the air in front of the contact area is gradually pushed to the uncontacted areas on both sides and discharged from both sides. At the same time, the adhesive layer 400 spreads to both sides under the compression action and fills the space between the adhesive component 500 and the concave adhesive surface.

[0022] Compared to directly applying structural adhesive to the rear edge pad or bonding corner and creating a closed air area during mold closing, this application avoids the air exhaust path being closed on both sides of the bonding area 300 beforehand by changing the adhesive application position and limiting the contact process from the center to both sides. This reduces the possibility of air entrapment, cavitation, and localized adhesive shortage in complex bonding areas such as L-shaped and C-shaped areas, and allows the adhesive material to be fully squeezed and filled under the action of mold closing load.

[0023] like Figure 1 As shown, the adhesive layer 400 has a protruding portion on the side facing the adhesive member 500. This protruding portion is a partial structure of the adhesive layer 400 itself protruding towards the adhesive member 500, and its surface facing the adhesive member 500 forms a first convex surface 420. The protruding portion is continuously disposed with the remaining adhesive layers 400 laid on the concave adhesive surface, and is not a separate component connected to the adhesive layer 400. In the assembled state, the first convex surface 420 faces the adhesive member 500 and is disposed opposite to the adhesive member 500.

[0024] During the mold closing process, because the protruding portion is closer to the adhesive member 500 than the adjacent area of ​​the adhesive layer 400, the first convex surface 420 contacts the adhesive member 500 first. The mold closing load is first applied to the protruding portion and then transmitted from the protruding portion to the adjacent area of ​​the adhesive layer 400. As the mold closing continues, the protruding portion is compressed, and the contact area between the adhesive layer 400 and the adhesive member 500 expands outward from the area where the first convex surface 420 is located. This causes air in the adhesive layer 400 and air between the adhesive member 500 and the adhesive layer 400 to be discharged outward along the direction of contact area expansion. The first convex surface 420 thus forms a predetermined first contact area for the adhesive layer 400, reducing the possibility that the edge of the adhesive layer 400 contacts the adhesive member 500 first, trapping air in the central area.

[0025] Please continue reading. Figure 1 The adhesive layer 400 has two opposite boundaries on its cross-section, designated as the first side and the second side, respectively. A slope 410 is provided on the side of the adhesive layer 400 facing the adhesive member 500. This slope 410 is located between the first side and the central region of the adhesive layer 400, extending from the first side towards the central region. The slope 410 is only provided on the side where the first side of the adhesive layer 400 is located. Along the direction from the first side towards the central region, the thickness of the adhesive layer 400 gradually increases, making the adhesive layer 400 relatively thinner at the first side and relatively thicker in the central region. This thickness variation of the adhesive layer 400 itself forms a protruding portion that bulges towards the adhesive member 500.

[0026] During the mold closing process, the thicker central region first approaches and contacts the adhesive component 500. As the mold closing load increases and the adhesive layer 400 is compressed, the contact area gradually expands from the central region towards the first side along the inclined surface 410. Air between the inclined surface 410 and the adhesive component 500 can still be discharged along the direction of the first side before they make full contact. The inclined surface 410 changes the contact process of the adhesive layer 400 on the first side from simultaneous contact to gradual contact, allowing the adhesive layer 400 to be compressed and spread sequentially with the mold closing stroke, further reducing the possibility of air entrapment or insufficient adhesive in the first side region due to sudden closure.

[0027] Please continue reading. Figure 1 The protruding portion extends from the central region of the adhesive layer 400 towards the second side, and the extended surface of the protruding portion facing the adhesive member 500 forms a first convex surface 420. Thus, on the side of the adhesive layer 400 facing the adhesive member 500, one side of the central region extends to the first side via a slope 410, and the other side of the central region extends to the second side via the protruding portion and the first convex surface 420, and the second side does not have the same slope 410 as the first side.

[0028] During mold closing, the first convex surface 420 corresponding to the central region first contacts the adhesive component 500. As the two shells approach each other further, the contact compression area expands along the inclined surface 410 towards the first side and along the first convex surface 420 towards the second side, causing the adhesive layer 400 to be compressed towards the first and second sides respectively. The air between them also moves towards the corresponding sides and is discharged as the contact area expands. The inclined surface 410, the protruding portion, and the first convex surface 420 together define the specific structure of the adhesive layer 400 gradually contacting the sides from the center, ensuring that the center contacts first and the sides contact later.

[0029] In one specific embodiment, the adhesive member 500 has a central pressing portion on the side facing the adhesive layer 400. The central pressing portion is located at the center of the side of the adhesive member 500 facing the adhesive layer 400 and protrudes towards the adhesive layer 400 relative to the sides located on both sides of the central pressing portion. The surface of the central pressing portion facing the adhesive layer 400 thus forms a second convex surface. Before mold closing, the second convex surface is disposed opposite to the adhesive layer 400, and the second convex surface is closer to the adhesive layer 400 in the mold closing direction than the two sides of the adhesive member 500.

[0030] When the pressure surface housing 100 and the suction surface housing 200 are closed relative to each other, the central pressing part first contacts the central region of the adhesive layer 400 through the second convex surface. The closing load is transmitted to the adhesive layer 400 through the central pressing part, causing the adhesive layer 400 to be compressed in the central region first. As the mold closing continues, the sides of the adhesive member 500 located on both sides of the central pressing part gradually approach the adhesive layer 400, causing the contact and compression area between them to expand from the central region to both sides. The central pressing part determines the initial contact position through the protruding structure of the adhesive member 500 itself, avoiding the sides of the adhesive member 500 from contacting the adhesive layer 400 first and sealing the central air, and cooperates with the structure of the adhesive layer 400 set on the concave adhesive surface, so that the air can be discharged to both sides under the action of the mold closing load during the compression process of the adhesive layer 400.

[0031] like Figure 1 As shown, the bonding area 300 is an L-shaped bonding area 300 located at the corresponding position on the trailing edge of the blade. In this case, a concave bonding surface is formed on the side of the pressure surface housing 100 facing the bonding member 500. The bonding member 500 is a trailing edge pad or a trailing edge bonding corner, located between the pressure surface housing 100 and the suction surface housing 200 and opposite to the concave bonding surface. Before mold closing, the concave bonding surface of the pressure surface housing 100 is selected as the adhesive application location, and the adhesive layer 400 is laid on this concave bonding surface, instead of applying the structural adhesive only to the trailing edge pad or trailing edge bonding corner as in the prior art.

[0032] During the mold closing process, the pressure surface housing 100 drives the adhesive layer 400 to move toward the rear edge pad or the rear edge adhesive corner. The adhesive layer 400 and the rear edge pad or the rear edge adhesive corner first contact in the relative central area. Then, the contact extrusion area expands to both sides of the L-shaped adhesive area 300. Under pressure, the adhesive layer 400 fills the adhesive space between the pressure surface housing 100 and the rear edge pad or the rear edge adhesive corner, and the air is discharged to both sides as the contact area expands.

[0033] Thus, the concave adhesive surface of the pressure surface housing 100, the adhesive layer 400, and the rear edge pad or rear edge adhesive corner work together to provide a path for the air that would otherwise be trapped between the inclined surface 410 and the concave surface to be discharged to both sides, further reducing the possibility of cavitation and local glue deficiency in the L-shaped special area.

[0034] like Figure 2 As shown, when the bonding area 300 is a C-shaped bonding area 300, a concave bonding surface is formed on the side of the suction surface housing 200 facing the bonding member 500, and the bonding member 500 adopts a bonding angle. The bonding angle is set on the corresponding side of the pressure surface housing 100 and located between the pressure surface housing 100 and the suction surface housing 200. The side of the bonding angle facing the suction surface housing 200 is opposite to the concave bonding surface of the suction surface housing 200, and the adhesive layer 400 is laid on the concave bonding surface of the suction surface housing 200.

[0035] During the mold closing process, the pressure surface housing 100 falls towards the suction surface housing 200, and the bonding angle approaches the adhesive layer 400 laid on the suction surface housing 200 along with the pressure surface housing 100. The bonding angle and the adhesive layer 400 first contact in the opposite central region, and then the contact compression area between the two expands from the center to both sides. Under the compression action of the bonding angle, the adhesive layer 400 spreads and fills along the C-shaped bonding area 300, and the air located between the bonding angle and the adhesive layer 400 is gradually pushed to both sides and discharged.

[0036] In this embodiment, the application position of the structural adhesive is adjusted from the bonding angle to the concave bonding surface of the suction surface housing 200, so that the bonding angle and the adhesive layer 400 form a mold-closing relationship with the center contacting first and the sides contacting later, reducing the possibility of the C-shaped vertical bonding area 300 forming a closed air space when the mold is closed.

[0037] In some embodiments, the adhesive layer 400 is a structural adhesive layer, which is directly laid on the concave adhesive surface of the pressure surface housing 100 or the suction surface housing 200, and forms a surface morphology facing the adhesive member 500 according to the aforementioned contact requirements. Before mold closing, the structural adhesive layer is laid on the concave adhesive surface and faces the adhesive member 500. During mold closing, the structural adhesive layer is compressed from the central region under the pressure applied by the adhesive member 500, and spreads to adjacent regions as the contact area expands to both sides, thereby filling the adhesive space between the adhesive member 500 and the concave adhesive surface. After mold closing is completed, the structural adhesive layer is located between the concave adhesive surface and the adhesive member 500, forming an adhesive connection between the two.

[0038] The structural adhesive layer serves as both an adhesive medium between the pressure surface shell 100 or the suction surface shell 200 and the adhesive component 500, and also pushes air to both sides through its pressure spreading process. This allows the adhesive function to work in conjunction with the air venting and filling processes, improving the filling status of special areas while reducing the possibility of air bubbles or localized adhesive shortages caused by air entrapment.

[0039] Specifically, the structural adhesive can be epoxy structural adhesive, polyurethane structural adhesive, acrylic structural adhesive, or methacrylate structural adhesive.

[0040] In other embodiments, the adhesive member 500 has an exhaust guide groove on the side facing the adhesive layer 400. The opening of the exhaust guide groove is disposed facing the adhesive layer 400. The exhaust guide groove extends from the middle region of the adhesive member 500 to at least one side of the adhesive member 500 and extends to that side to form an exhaust port communicating with the outside.

[0041] During the mold closing process, the adhesive component 500 and the adhesive layer 400 begin to contact from the middle region. The air between them is pushed to the side of the adhesive component 500 as the contact extrusion area expands to both sides. The air entering the exhaust guide groove can flow from the middle region to the side along the exhaust guide groove and be discharged through the exhaust port at the side.

[0042] Thus, as the adhesive component 500 and the adhesive layer 400 gradually come into contact, the venting guide groove provides a directional venting path from the center to the side, and cooperates with the extrusion process that expands from the center to both sides, further reducing the possibility of air being trapped between the adhesive component 500 and the adhesive layer 400.

[0043] This application also provides a wind turbine generator set, which includes blades, and the blades are bonded and fixed by the blade molding and adhesive coating structure described above. Since the blades provided in this application have the blade molding and adhesive coating structure described above, they have all the technical effects of the blade molding and adhesive coating structure described above, which will not be repeated here.

[0044] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details of the above application are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0045] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Unless otherwise defined, the technical or scientific terms used in the claims and description should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar words used in the patent application description and claims of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar words mean that the element or object preceding "comprising" or "including" encompasses the element or object listed following "comprising" or "including" and its equivalents, and do not exclude other elements or objects. The terms "connected," "coupled," or "linked" and similar words are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections. Words such as “including,” “contains,” and “has” are open-ended words that mean “including but not limited to” and can be used interchangeably with them.

[0046] In this application, the terms "or" and "and / or" describe the relationship between related objects and indicate a non-exclusive inclusion. For example, "A and / or B" and "A or B" can include: only "A" exists, only "B" exists, and both "A" and "B" exist simultaneously, where "A" and "B" can be singular or plural. As another example, "A, B, and / or C" and "A, B, or C" can include: only "A" exists, only "B" exists, only "C" exists, both "A" and "B" exist simultaneously, both "A" and "C" exist simultaneously, both "B" and "C" exist simultaneously, and both "A", "B", and "C" exist simultaneously, where "A", "B", and "C" can be singular or plural. Furthermore, the symbol " / " in this application indicates an "or" relationship between the related objects before and after the symbol. In this application, the term "at least one A or B" has the same meaning as the aforementioned "A or B". The term "at least one A, B or C" has the same meaning as "A, B or C" above.

[0047] In the apparatus and equipment of this application, the components can be disassembled and / or reassembled. These disassemblies and / or reassemblies should be considered as equivalent solutions of this application.

[0048] The above description of the claimed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be applied within the widest scope consistent with the principles and novel features of this application.

[0049] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms described herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A blade mold-forming and adhesive-coating structure, characterized in that, include: Pressure surface housing and suction surface housing; An adhesive component is disposed between the pressure surface housing and the suction surface housing; An adhesive region is formed on the side of at least one of the pressure surface housing and the suction surface housing facing the adhesive member, and the adhesive region has a concave adhesive surface; An adhesive layer is laid on the concave adhesive surface; During the mold closing process of the pressure surface housing and the suction surface housing, the adhesive component and the adhesive layer begin to contact from the middle region, and the contact and compression area between the adhesive component and the adhesive layer expands from the middle region to both sides as the mold closing progresses.

2. The blade molding and adhesive coating structure according to claim 1, characterized in that, The adhesive layer has a protruding portion that protrudes toward the adhesive member on one side, and the protruding portion has a first convex surface facing the adhesive member.

3. The blade molding and adhesive coating structure according to claim 2, characterized in that, The adhesive layer has opposing first and second sides, and the adhesive layer has an inclined surface on one side facing the adhesive member; The inclined surface extends from the first side toward the central region of the adhesive layer, and the thickness of the adhesive layer gradually increases along the direction from the first side toward the central region to form the protruding portion.

4. The blade molding and adhesive coating structure according to claim 3, characterized in that, The protruding portion extends from the central region toward the second side, and the surface of the protruding portion facing the adhesive member forms the first convex surface.

5. The blade molding and adhesive coating structure according to claim 1, characterized in that, The adhesive member includes a central pressing portion on the side facing the adhesive layer, and the central pressing portion protrudes toward the adhesive layer relative to both sides of the adhesive member, so that the surface of the central pressing portion facing the adhesive layer forms a second convex surface.

6. The blade molding and adhesive coating structure according to any one of claims 1-5, characterized in that, The bonding area is an L-shaped bonding area, the concave bonding surface is formed on the pressure surface shell, and the bonding member is a rear edge pad or a rear edge bonding angle.

7. The blade molding and adhesive coating structure according to any one of claims 1-5, characterized in that, The bonding area is a C-shaped bonding area, the concave bonding surface is formed on the suction surface shell, and the bonding member is a bonding angle.

8. The blade molding and adhesive coating structure according to claim 1, characterized in that, The adhesive layer is a structural adhesive layer.

9. The blade molding and adhesive coating structure according to claim 1, characterized in that, The adhesive member has an exhaust guide groove on the side facing the adhesive layer. The exhaust guide groove extends from the central region of the adhesive member to at least one side of the adhesive member to form an exhaust port on the side of the adhesive member.

10. A wind turbine generator set, characterized in that, It includes blades, and the blades have the blade molding and coating structure described in any one of claims 1-9.

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