A pultruded panel, a pultruded spar and a wind turbine blade

Abstract

The application provides a pultruded plate, a pultruded girder and a wind power blade. The pultruded plate comprises a first layer of pultruded plate; a second layer of pultruded plate which is stacked in a staggered manner with the first layer of pultruded plate; and a lightweight core material which is arranged between the first layer of pultruded plate and the second layer of pultruded plate and along the length direction of the first layer of pultruded plate and the second layer of pultruded plate. In the above structure, the lightweight core material is arranged between the two layers of pultruded plate. By using the lightweight core material to replace the pultruded material with the same volume, the overall weight of the pultruded plate can be reduced, so that more stacking can be realized when the pultruded plate is used to manufacture a large wind power blade, and the use of the pultruded plate on the large wind power blade is limited or even avoided. Furthermore, the two layers of pultruded plate are stacked in a staggered manner, so that the two layers of pultruded plate have staggered parts while being stacked, thereby enabling the staggered parts of adjacent pultruded plates to be spliced with each other when the pultruded plates are stacked, facilitating the stacking operation, and improving the mechanical properties of the pultruded girder formed by stacking.

Description

Technical Field

[0001] This application relates to the field of wind power equipment technology, specifically to a pultruded sheet, a pultruded main beam, and a wind turbine blade. Background Technology

[0002] The main beam is the main load-bearing component in the wind turbine blade structure. It bears most of the bending load of the wind turbine blade, and its strength and stiffness directly affect the load-bearing capacity of the wind turbine blade.

[0003] Currently, most main beams are constructed by stacking several pultruded sheets, which are solid, compacted structures. To ensure that the main beams of wind turbine blades meet the requirements for stiffness and strength, a large number of pultruded sheets need to be stacked. However, because the compacted structure of pultruded sheets is relatively heavy, the main beam formed by stacking too many pultruded sheets has a significant weight, making it impossible to meet the lightweight design requirements of large wind turbine blades. This limits the use of pultruded sheets in large wind turbine blades. Summary of the Invention

[0004] In view of this, this application provides a pultruded sheet material that can reduce or even avoid the limitations of using pultruded sheets material in large wind turbine blades. In addition, this application also provides a pultruded main beam having the above-mentioned pultruded sheet material, and a wind turbine blade having the pultruded main beam.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A pultruded sheet material, comprising:

[0007] First pultruded plate;

[0008] The second pultruded sheet is stacked with the first pultruded sheet in the thickness direction and offset in the width direction;

[0009] A lightweight core material is disposed between the first pultruded plate and the second pultruded plate, wherein the extension direction of the lightweight core material is consistent with the length direction of the first pultruded plate and the second pultruded plate.

[0010] Optionally, in the above-mentioned pultruded sheet, the lightweight core material in the length direction comprises multiple segments with different thicknesses.

[0011] Optionally, in the above-mentioned pultruded sheet, the lightweight core material includes a first equal-thickness section and a second equal-thickness section, as well as a gradient section located between the first equal-thickness section and the second equal-thickness section;

[0012] Furthermore, the thickness of the first pultruded layer and the second pultruded layer remains unchanged in the length direction.

[0013] Optionally, in the above-mentioned pultruded sheet, at least two of the first equal-thickness section, the gradient section, and the second equal-thickness section are made of different materials in the length direction, and are respectively at least two of balsa wood, PET, and PVC.

[0014] Optionally, in the above-mentioned pultruded sheet, the cross-sectional shape of the lightweight core material in a section perpendicular to the length direction is one or more of the following: circular, elliptical, and polygonal, and the thickness of the lightweight core material is the diameter of the circle, the major axis of the ellipse, or the height of the polygon.

[0015] Optionally, in the above-mentioned pultruded sheet, in the width direction of the first pultruded sheet and the second pultruded sheet, the pultruded sheet includes a plurality of the lightweight core materials, and the lightweight core materials have the same cross-sectional shape.

[0016] A pultruded main beam includes multiple connected pultruded plates, wherein the pultruded plates are any of the pultruded plates mentioned above, wherein the first layer of pultruded plates and the second layer of pultruded plates are staggered to form a staggered portion, and adjacent pultruded plates are connected by splicing between the staggered portions.

[0017] Optionally, in the above-mentioned pultruded main beam, each of the misaligned portions has multiple core material positions, and the splicing of adjacent pultruded sheets is achieved through contact between all the core material positions.

[0018] Optionally, in the above-mentioned pultruded main beam, when the first pultruded plate and the second pultruded plate are misaligned relative to each other, the plurality of misaligned portions are located at both ends of the pultruded plate in the width direction, and the misaligned portions at both ends are centrally symmetrically arranged.

[0019] A wind turbine blade includes a pultruded main beam, wherein the pultruded main beam is any of the pultruded main beams described above.

[0020] At least one embodiment of this application provides a pultruded sheet with a lightweight core material between the first and second pultruded sheets. By using a lightweight core material instead of pultruded material of the same volume, the overall weight of the pultruded sheet can be reduced compared to a solid, dense structure. This allows for a greater number of pultruded sheets to be stacked when manufacturing large wind turbine blades, thereby reducing or even eliminating the limitations on the use of pultruded sheets in large wind turbine blades. Furthermore, when setting the first and second pultruded sheets, they are stacked in a staggered manner, so that they have a staggered portion while being stacked. This allows the staggered portions of adjacent pultruded sheets to be spliced ​​together during stacking, which not only facilitates the stacking operation but also improves the mechanical properties of the pultruded main beam formed by stacking, optimizing the strength, stiffness, load-bearing capacity, and buckling resistance of the pultruded main beam. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the pultruded sheet provided in the embodiments of this application;

[0023] Figure 2 This is a cross-sectional view of the pultruded sheet parallel to its length.

[0024] Figures 3-6 These are cross-sectional views of pultruded sheets perpendicular to their length direction, with lightweight core materials having different shapes.

[0025] Figure 7 This is an exploded view of the stacked modules;

[0026] Figure 8 This is a schematic diagram of the stacked module.

[0027] exist Figures 1-8 middle:

[0028] 1-Pultruded sheet metal, 2-Stacked modules;

[0029] 11-First pultruded sheet, 12-Second pultruded sheet, 13-Lightweight core material, 14-Core material position, 15-End pultruded sheet, 16-Middle pultruded sheet;

[0030] 131 - First equal thickness section, 132 - Gradual transition section, 133 - Second equal thickness section. Detailed Implementation

[0031] This application provides a pultruded sheet material that can reduce or even eliminate the limitations of using pultruded sheets in large wind turbine blades. Additionally, this application provides a pultruded main beam having the aforementioned pultruded sheet material, and a wind turbine blade having the pultruded main beam.

[0032] 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.

[0033] like Figures 1-8As shown, at least one embodiment of this application provides a pultruded sheet 1 for manufacturing wind turbine blades, which mainly includes a first pultruded sheet 11, a second pultruded sheet 12, and a lightweight core material 13. The first pultruded sheet 11 and the second pultruded sheet 12 are both sheets formed using a pultrusion process. Without considering the splicing plate 21 described later, their materials and structures are the same. Preferably, as shown... Figure 1 As shown, the first pultruded plate 11 and the second pultruded plate 12 can be formed into rectangular plates of the same size. The lightweight core material 13 refers to a material with a weight less than that of the pultruded plate 1 for the same volume. By filling the space between the first pultruded plate 11 and the second pultruded plate 12 with the lightweight core material 13, it can replace the pultruded material of the same volume, so that the pultruded plate 1 is no longer a solid, dense structure formed by the pultruded material, thereby reducing the overall weight of the pultruded plate 1. Furthermore, when forming the pultruded plate 1, the first pultruded plate 11 and the second pultruded plate 12 are staggered, that is, the first pultruded plate 11 and the second pultruded plate 12 are offset in the thickness direction of the pultruded plate 1 (thickness direction as shown in the figure). Figure 1 As shown, while stacking the layers on top of each other, it also ensures that the pultruded sheet 1 is in the width direction (width direction as shown) Figure 1 The material is staggered (as shown) to facilitate stacking. It should be noted that, to better demonstrate the arrangement of the lightweight core material 13 between the first pultruded plate 11 and the second pultruded plate 12, the material is... Figures 1-6 The staggered arrangement of the first pultruded plate 11 and the second pultruded plate 12 is not shown in the diagram. For details on the staggered arrangement, please refer to [link to relevant documentation]. Figure 7 and Figure 8 At the same time by Figure 7 and Figure 8 As can be seen, the misalignment in this application refers to the fact that the splice seam between two adjacent first-layer pultruded plates 11 in the width direction is not aligned with the splice seam between two adjacent second-layer pultruded plates 12 in the width direction.

[0034] The aforementioned pultruded sheet, by using a lightweight core material to replace the same volume of pultruded material, can transform a solid, dense pultruded sheet into a pultruded sheet 1 with a sandwich structure. This reduces the overall weight of the pultruded sheet 1, allowing for a greater number of stacks of pultruded sheets 1 when manufacturing large wind turbine blades, reducing or even eliminating the limitations imposed on the use of pultruded sheets 1 in large wind turbine blades. Furthermore, by staggering the first layer of pultruded sheets 11 and the second layer of pultruded sheets 12, the staggered portions of adjacent pultruded sheets 1 can be spliced ​​together during stacking, changing the existing stacking method. This not only facilitates the stacking operation but also improves the mechanical properties of the pultruded main beam formed by stacking, enhancing its strength, stiffness, load-bearing capacity, and buckling resistance.

[0035] As described above, this application can alter the mechanical properties of the pultruded main beam by staggering the first pultruded plate 11 and the second pultruded plate 12 in the width direction. For Figure 7 In essence, it manifests as the specific splicing structure and method between pultruded sheets. Specifically, it involves setting matching structures (i.e., the misaligned portions described later) in the areas of each pultruded sheet where no lightweight core material is present. The splicing of adjacent pultruded sheets is achieved through the contact and connection between these structures on adjacent sheets. The two ends of the spliced ​​structure (i.e., the two ends in the width direction) after splicing are... Figure 8 From a visual perspective, the ends (left and right) may not be flush due to misalignment of the upper and lower pultruded plates. Alternatively, the ends can be made flush in the thickness direction by cutting the first pultruded plate 11 located on the upper layer or the second pultruded plate 12 located on the lower layer (e.g., ...). Figure 7 and Figure 8 As shown in the figure, this application does not limit this. Furthermore, it should be noted that in at least one embodiment described later, a lightweight core material 13 is added between the mutually matching structures of the two pultruded plates (i.e., the misaligned portions described later). Based on this, grooves for accommodating the lightweight core material 13 need to be formed on the surfaces of this structure for contact with each other. However, to more fully demonstrate the matching between the aforementioned structures, grooves are not provided. Figure 7 The groove is shown in the image.

[0036] Regarding the aforementioned misalignment, the first pultruded plate 11 and the second pultruded plate 12 can be misaligned in different ways along the width direction. In one misalignment method, only one of the first pultruded plate 11 and the second pultruded plate 12 is misaligned relative to the other in the width direction. Specifically, for example, when the first pultruded plate 11 located at the top is misaligned relative to the second pultruded plate 12 located at the bottom, such as... Figure 7 As shown, the first pultruded sheet 11 comprises two parts: one part is aligned with the second pultruded sheet 12 (i.e., the aligned portion), and the other part is misaligned with the second pultruded sheet 12 (or, in other words, the portion extending relative to the second pultruded sheet in the width direction, i.e., the misaligned portion, which has the core material position 14 described later). The width of the second pultruded sheet 12 is smaller than the width of the first pultruded sheet 11, so that the second pultruded sheet 12 only has the aligned portion. The pultruded sheet 1 with this structure is the one described later. Figure 7 The end-pultruded sheet 15 is shown.

[0037] In another misalignment method, the first pultruded plate 11 and the second pultruded plate 12 can be misaligned relative to each other in the width direction. Specifically, as follows: Figure 7As shown, both the top pultruded plate 11 and the bottom pultruded plate 12 include an aligned portion and a misaligned portion. The aligned portions of the first pultruded plate 11 and the second pultruded plate 12 are aligned with each other. The misaligned portion of the first pultruded plate 11 extends to the right relative to the second pultruded plate 12, for example, to form the misaligned portion described later. The misaligned portion of the second pultruded plate 12 extends to the left relative to the first pultruded plate 12, for example (the extension directions of the misaligned portions on the first pultruded plate 11 and the second pultruded plate 12 can also be reversed) to form the core material position described later. The pultruded plate 1 with this structure is the one described later. Figure 7 The pultruded sheet 16 shown in the middle section.

[0038] Thus, any two adjacent pultruded sheets 1 can be stacked to form a pultruded main beam by matching and splicing their respective misaligned parts.

[0039] In addition, such as Figure 2 As shown, in the length direction of the pultruded sheet 1, the lightweight core material 13 includes multiple segments with different thicknesses, and preferably, these multiple segments include a gradually changing segment 132 with a gradually changing thickness. That is, the lightweight core material 13 has a gradually changing segment 132 in the length direction of the pultruded sheet 1, that is, the lightweight core material 13 can change its thickness in the length direction of the pultruded sheet 1, so that the pultruded sheet 1 has a variable cross-section sandwich structure. In this way, not only can the overall weight of the pultruded sheet 1 be reduced, so that more pultruded sheets 1 can be stacked when manufacturing large wind turbine blades, reducing or even avoiding the limitations of using pultruded sheets 1 on large wind turbine blades, but also the strength and stiffness of the pultruded sheet 1 can be further optimized, and the load-bearing capacity and buckling resistance of the pultruded main beam can be improved.

[0040] Specifically, there are several options for how the lightweight core material 13 can be set between the first pultruded plate 11 and the second pultruded plate 12. For example, before the first pultruded plate 11 and the second pultruded plate 12 are stacked and connected, grooves can be cut on the surfaces of the first pultruded plate 11 and the second pultruded plate 12 respectively. Then, a portion of the lightweight core material 13 can be set in the grooves of the first pultruded plate 11 and the second pultruded plate 12 respectively. Finally, the first pultruded plate 11 and the second pultruded plate 12 are stacked and connected to form a complete lightweight core material 13. Alternatively, after cutting the grooves, the first pultruded plate 11 and the second pultruded plate 12 can be stacked and connected first so that the grooves on the two can be joined to form a complete filling cavity. Then, the lightweight core material 13 can be completely set in the filling cavity at once.

[0041] Provided that the lightweight core material 13 can vary in thickness along the length of the pultruded sheet 1, such as Figure 2As shown, along the length of the pultruded sheet 1: the lightweight core material 13 includes a first equal-thickness section 131 and a second equal-thickness section 133, and a gradient section 132 located between the first equal-thickness section 131 and the second equal-thickness section 133; the thickness of the first pultruded sheet 11 and the second pultruded sheet 12 remains unchanged, and the spacing between different sections of the first pultruded sheet 11 and the second pultruded sheet 12 is the same as the thickness of the first equal-thickness section 131, the gradient section 132, and the second equal-thickness section 133, respectively. That is, the first pultruded sheet 11 and the second pultruded sheet 12 are set as equal-thickness sheets, while the lightweight core material 13 is set as a size gradient, so that the thickness of the entire pultruded sheet 1 changes with the thickness of the lightweight core material 13, thereby minimizing the weight of the pultruded sheet 1 and making the pultruded sheet 1 a variable-thickness sheet, so as to reduce the height limitation of the pultruded main beam and better avoid the weight increase caused by excessive stacking of the pultruded sheet 1. Alternatively, the first pultruded plate 11 and the second pultruded plate 12 can be made to have different thicknesses, so that while ensuring structural strength and rigidity, they can better change with the thickness of the lightweight core material 13, thereby further reducing the weight of the pultruded plate 1.

[0042] In the above structure, the lightweight core material 13 includes a first equal-thickness section 131, a second equal-thickness section 133, and a gradient section 132. This allows the entire pultruded sheet 1 to be a sheet with a changing thickness in the middle and constant thickness on both sides. Furthermore, it is preferable that the thickness of the gradient section 132 changes linearly, resulting in a sloped surface for the gradient section 132. The thicknesses on both sides can be the same or different. This structure is relatively regular and beneficial for stacking, therefore it is considered the preferred structure in this application. Alternatively, the lightweight core material 13 may not include the equal-thickness section, but only the gradient section 132. That is, the thickness of the lightweight core material 13 is different at various points along its length, and the change trend can be linear or non-linear, so that the surface of the pultruded sheet 1 is an inclined surface or a curved surface, etc.

[0043] In this application, the lightweight core material 13 can be configured in various ways. Regarding the molding structure and material: in the length direction of the pultruded sheet 1, the first equal-thickness section 131, the gradient section 132, and the second equal-thickness section 133 are made of the same material, namely balsa wood, PET (polyethylene terephthalate), or PVC (polyvinyl chloride). That is, in the length direction, the lightweight core material 13 is a single unit (but in the width direction of the pultruded sheet 1, such as...). Figure 5 and Figure 6As shown, there can be multiple lightweight core materials 13), each segment of which is made of the same material, specifically balsa wood, PET, or PVC. Since balsa wood, PET, and PVC are all common lightweight materials in actual production processes, they are easy to obtain and inexpensive, thus facilitating the implementation of the solution and reducing the production cost of the pultruded sheet 1.

[0044] Alternatively, along the length of the pultruded sheet 1, at least two of the first equal-thickness section 131, the gradient section 132, and the second equal-thickness section 133 may be made of different materials, and these at least two different materials may be balsa wood, PET, and PVC. Since different parts of the wind turbine blade have different strength requirements, and balsa wood, PET, and PVC have different densities and strengths, by making the lightweight core material 13 into multiple separate parts of different materials connected along its length, and placing these different material parts in different parts of the wind turbine blade, the structural strength and performance of the wind turbine blade can be further improved. For example, the first equal-thickness section 131 may be made of balsa wood, the gradient section 132 of PET, and the second equal-thickness section 133 of PVC. Specifically, since the suspension point, support point and / or blade root of the wind turbine blade have higher strength requirements, the lightweight core material 13 located in these locations can be made of balsa wood with higher strength, while the lightweight core material 13 located in other parts of the wind turbine blade can be made of PET with relatively higher strength. Alternatively, the lightweight core material 13 located at the blade root can be made of balsa wood, the lightweight core material 13 located in the middle of the blade can be made of PET, and the lightweight core material 13 located at the blade tip can be made of PVC.

[0045] In terms of shape and quantity: such as Figures 3-6 As shown, in a cross-section perpendicular to the length direction, the lightweight core material 13 has a cross-sectional shape that is one or a combination of a circle, an ellipse, a regular polygon, and an irregular polygon. Simultaneously, in the width direction of the first pultruded plate 11 and the second pultruded plate 12, there are multiple lightweight core materials 13, all with the same cross-sectional shape. That is, one or more lightweight core materials 13 can be provided in the width direction; when there is only one, its cross-sectional shape can be any one of a circle, an ellipse, a regular polygon, or an irregular polygon, for example... Figure 1 and Figure 3 As shown, it can be a mirror image of two isosceles trapezoids, or... Figure 4 The rectangular shape shown; when there are multiple lightweight core materials 13, the cross-sectional shapes of the multiple lightweight core materials 13 can all be the same, for example... Figure 5 and Figure 6 As shown, they can all be circular, hexagonal, etc., or the cross-sectional shapes of multiple lightweight core materials 13 can be partially the same or different.

[0046] Specifically, in Figure 3In the diagram, the thickness of the lightweight core material 13 refers to the distance between the two horizontal sides of the two spliced ​​trapezoids, as shown by the dotted line; Figure 4 In the text, the thickness of the lightweight core material 13 refers to the length of the vertical side (or the shorter side) of the rectangle, as shown by the dotted line; Figure 5 In the diagram, the thickness of the lightweight core material 13 refers to the vertical diameter of the circle, as shown by the dotted line; Figure 6 In the text, the thickness of the lightweight core material 13 refers to the distance between the two horizontal sides of the hexagon, as shown by the dashed line.

[0047] In addition, this application also provides a pultruded main beam, which includes a plurality of connected pultruded plates 1, the pultruded plates 1 being the aforementioned pultruded plates, wherein the first pultruded plate 11 and the second pultruded plate 12 are staggered to form the aforementioned staggered portion, and the staggered portion has a core material position 14 (e.g. Figure 7 As shown, the core material position 14 refers to the part on the misaligned portion that aligns with each lightweight core material 13. Since the number of lightweight core materials 13 corresponding to the misaligned portion can be one or more, a misaligned portion can have only one core material position 14 or multiple core material positions 14. Regardless of the number of core material positions 14, all core material positions 14 constitute the misaligned portion. Any two adjacent pultruded plates 1 are connected by splicing between the misaligned portions. As mentioned above, the misaligned portion is formed by setting the misalignment, which facilitates the stacking and forming of the pultruded main beam, making it easier to form the pultruded main beam from the pultruded plate 1. In addition, the setting of the misaligned portion, such as Figure 7 and Figure 8 As shown, staggered stacking of pultruded sheets 1 can be achieved, which can solve the problem of stacking slippage of pultruded sheets 1.

[0048] Based on the above structure, such as Figure 7 and Figure 8As shown, a lightweight core material 13 is provided between the misaligned portions of any two adjacent pultruded plates 1. This lightweight core material 13 is the lightweight core material aligned with the aforementioned core material position 14. This allows the stacked pultruded main beam to include a greater number of lightweight core materials 13, and the layout of the lightweight core materials 13 is more reasonable. This not only further reduces the weight of the pultruded main beam but also improves its load-bearing capacity. Specifically, this application preferably has multiple core material positions 14 on the misaligned portion of each pultruded plate 1, more preferably two, and further preferably the size of the misaligned portion composed of all core material positions 14 is the same as the size of the first pultruded plate 11 or the second pultruded plate 12 connected to it. The number, structure, and distribution of the lightweight core materials 13 provided between the two splicing plates 21 are the same as those of the lightweight core materials 13 provided between the first pultruded plate 11 and the second pultruded plate 12. When splicing two adjacent pultruded plates 1, it is preferable that the splicing of the two adjacent pultruded plates 1 is achieved through the contact and connection between all the core material positions 14, thereby maximizing the stacking firmness and the load-bearing capacity of the pultruded main beam.

[0049] like Figure 7 and Figure 8 As shown, due to the different positions of the core material 14 in the pultruded sheet 1, the structure of the pultruded sheet 1 is also different. Based on this, this application classifies the pultruded sheet 1 into two types: the pultruded sheet 1 includes core material 14 located in each stacking module (the stacking module is...). Figure 8 The structure shown includes end pultruded plates 15 at both ends and a middle pultruded plate 16 located between the two end pultruded plates 15, wherein: in the end pultruded plates 15, as described above, only one of the first pultruded plate 11 and the second pultruded plate 12 is misaligned relative to the other; in the middle pultruded plate 16, as described above, the first pultruded plate 11 and the second pultruded plate 12 are both misaligned relative to each other, and multiple misaligned portions are located at both ends of the pultruded plate 1 in the width direction, and the misaligned portions at both ends are centrally symmetrical about the center of the pultruded plate 1, that is, the misaligned portions at both ends are located at diagonal positions of the pultruded plate 1. In this structure, since the end pultruded plates 15 located at both ends only need to be spliced ​​with other pultruded plates on one side, it is only necessary to provide a misalignment part on the first pultruded plate 11 or the second pultruded plate 12. However, the middle pultruded plate 16 located in the middle needs to be spliced ​​with other pultruded plates on both sides, so the first pultruded plate 11 and the second pultruded plate 12 are both provided with misalignment parts, and the two misalignment parts extend to both sides of the pultruded plate 1. At the same time, in order to ensure normal splicing with the adjacent pultruded plate 1, the two misalignment parts are located at two diagonal positions belonging to the same pultruded plate 1.

[0050] Furthermore, this application also provides a wind turbine blade, including a pultruded main beam, which is the aforementioned pultruded main beam.

[0051] Since the aforementioned wind turbine blades include pultruded main beams, please refer to the above content for the beneficial effects of pultruded main beams on wind turbine blades, which will not be repeated here.

[0052] 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 disclosed above 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.

[0053] 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. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0054] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0055] The above description of the disclosed 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 accorded the widest scope consistent with the principles and novel features disclosed herein.

[0056] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0057] 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 disclosed 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 pultruded sheet, characterized in that, include: First pultruded plate; The second pultruded sheet is stacked with the first pultruded sheet in the thickness direction and offset in the width direction; A lightweight core material is disposed between the first pultruded plate and the second pultruded plate, wherein the extension direction of the lightweight core material is consistent with the length direction of the first pultruded plate and the second pultruded plate; the lightweight core material includes a first equal-thickness section and a second equal-thickness section, and a gradient section located between the first equal-thickness section and the second equal-thickness section, wherein at least two of the first equal-thickness section, the gradient section and the second equal-thickness section are made of different materials; In this design, grooves are formed on the contact surfaces of the first pultruded plate and the second pultruded plate, and the grooves formed on the first pultruded plate and the second pultruded plate are combined to form a filling cavity to accommodate the lightweight core material.

2. The pultruded sheet according to claim 1, characterized in that, Along the length direction, the lightweight core material comprises multiple segments of varying thicknesses.

3. The pultruded sheet according to claim 2, characterized in that, In the length direction, the thickness of the first pultruded layer and the second pultruded layer remains unchanged.

4. The pultruded sheet according to claim 3, characterized in that, The first equal-thickness section, the gradient section, and the second equal-thickness section are at least two of balsa wood, PET, and PVC, respectively.

5. The pultruded sheet according to claim 1, characterized in that, In a cross-section perpendicular to the length direction, the cross-sectional shape of the lightweight core material is one or more combinations of a circle, an ellipse, and a polygon, and the thickness of the lightweight core material is the diameter of the circle, the major axis of the ellipse, or the height of the polygon.

6. The pultruded sheet according to claim 5, characterized in that, In the width direction of the first pultruded sheet and the second pultruded sheet, the pultruded sheet includes a plurality of the lightweight core materials, and the lightweight core materials have the same cross-sectional shape.

7. A pultruded main beam, characterized in that, The invention comprises multiple connected pultruded sheets, wherein the pultruded sheets are any one of claims 1-6, wherein the first pultruded sheet and the second pultruded sheet are staggered to form a misaligned portion, and adjacent pultruded sheets are connected by splicing the misaligned portions.

8. The pultruded main beam according to claim 7, characterized in that, Each of the misaligned portions has multiple core material positions, and the splicing of adjacent pultruded sheets is achieved through contact between all of the core material positions.

9. The pultruded main beam according to claim 7, characterized in that, When the first pultruded plate and the second pultruded plate are misaligned relative to each other, the plurality of misaligned portions are located at both ends of the pultruded plate in the width direction, and the misaligned portions at both ends are centrally symmetrically arranged.

10. A wind turbine blade, comprising a pultruded main beam, characterized in that, The pultruded main beam is the pultruded main beam as described in any one of claims 7-9.

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