Forming method for wind power blade root bolt structure
阅读说明:本技术 用于风电叶片根部螺栓结构的成型方法 (Forming method for wind power blade root bolt structure ) 是由 谈源 汤娟 周敏杰 邓嘉康 王瑞 于 2019-11-11 设计创作,主要内容包括:本发明涉及风电叶片零部件制造技术领域,具体涉及用于风电叶片根部螺栓结构的成型方法,包括以下步骤:织物的铺设:将至少一层织物铺设于模具内;底层填充物的设置:将复合材料填充物放置于织物铺设完成后所形成的腔体内;金属螺套的设置:将螺栓结构的金属螺套设置于放置完成的复合材料填充物上;顶层填充物的设置:将复合材料填充物设置于放置完成的金属螺套上;织物边缘的闭合:将织物裸露的两端部边缘进行闭合;成型:对模具内的组合结构进行成型。通过本发明,可有效保证叶片根部的质量,提高螺栓套与复合材料的连接可靠性以及根部螺栓的承载能力,保证产品的使用寿命和安全。(The invention relates to the technical field of wind power blade part manufacturing, in particular to a forming method for a bolt structure at the root part of a wind power blade, which comprises the following steps: laying a fabric: laying at least one layer of fabric in a mould; setting of the underfill: placing the composite material filler in a cavity formed after the fabric is laid; the arrangement of the metal thread insert: arranging a metal thread insert of a bolt structure on the placed composite material filler; setting of top layer filler: arranging the composite material filler on the placed metal screw sleeve; closing of the fabric edge: closing the edges of the two exposed end parts of the fabric; molding: and forming the combined structure in the mold. The invention can effectively ensure the quality of the root of the blade, improve the connection reliability of the bolt sleeve and the composite material and the bearing capacity of the root bolt, and ensure the service life and the safety of the product.)
1. The forming method for the bolt structure at the root part of the wind power blade is characterized by comprising the following steps,
laying a fabric: laying at least one layer of fabric in a mold, wherein the edges of two end parts of the fabric are exposed outside the mold;
setting of the underfill: placing composite material filler in a cavity formed after the fabric is laid;
the arrangement of the metal thread insert: arranging a metal thread insert of a bolt structure on the placed composite material filler;
setting of top layer filler: arranging a composite material filler on the placed metal screw sleeve, wherein a prismatic structure with a rectangular cross section is obtained by wrapping the metal screw sleeve by the bottom-layer filler and the top-layer filler;
closing of the fabric edge: closing the edges of the two exposed end parts of the fabric, so as to circumferentially coat the prism structure;
molding: and forming the combined structure in the mold.
2. The molding method for the wind power blade root bolt structure according to claim 1, wherein when the fabric laid in the mold is more than one layer, the seams between the fabrics are arranged in a staggered manner.
3. The forming method for the wind power blade root bolt structure according to claim 1 or 2, wherein there is an overlapping portion at the seam of each layer of fabric.
4. The method of claim 1, wherein the fabric is at least partially pre-shaped to conform to the shape of the inner wall of the cavity in the mold prior to being laid in the mold.
5. The molding method for the wind power blade root bolt structure according to claim 1, wherein the prism structure is a regular quadrangular prism structure.
6. The forming method for the wind power blade root bolt structure according to claim 5, wherein the composite material filler comprises 1/4 cylindrical surfaces attached to the outside of the metal thread insert and two planes respectively connected with two ends of the cylindrical surfaces, and the two planes form a right-angle structure after being connected.
7. The molding method for the wind power blade root bolt structure according to claim 1, wherein the composite filler is a composite preform, and the molding matrix is a fiber or a fiber fabric.
8. The forming method for the wind power blade root bolt structure according to claim 7, wherein the forming matrix is further coated with a fiber fabric.
9. The forming method for the wind power blade root bolt structure according to claim 1, wherein the material of the composite material filler and fabric is selected from one or more of glass fiber, carbon fiber, basalt fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, polyamide fiber, polyphenylene sulfide fiber, polyimide fiber, polyester fiber, polypropylene fiber or nylon fiber.
10. The forming method for the wind power blade root bolt structure according to claim 1, wherein the forming process is an RTM process, an HP-RTM process or a VARI process.
Technical Field
The invention relates to the technical field of wind power blade part manufacturing, in particular to a forming method for a bolt structure at the root part of a wind power blade.
Background
Wind energy is increasingly gaining attention as a clean renewable energy source in all countries of the world. China has large wind energy storage capacity and wide distribution range, and the wind power generation industry rapidly develops to become one of the main markets of wind power generation in the whole world after Europe, America and India.
The comprehensive research and development trend analysis of the market current situation of the Chinese wind power blade in 2019-2025 released by the Chinese industry research network considers that the fan blade is a key core wind turbine component of the wind energy technical progress, and the good design, reliable quality and superior performance of the fan blade are determining factors for ensuring the normal and stable operation of a unit. The development of the Chinese fan blade industry is developed along with the development of the wind power industry and the wind power equipment industry, the Chinese fan blade is started later, the market demand is met by mainly relying on import initially, and the supply capacity of the Chinese fan blade industry is rapidly improved along with the combined efforts of domestic enterprises and scientific research institutions.
Wind-powered electricity generation blade root plays crucial effect to whole wind-powered electricity generation blade subassembly's normal operating as the main position of connection, and the quality problem of current blade root bolted construction junction has seriously influenced the life of product.
In view of the above problems, the inventor of the present invention has actively studied and innovated based on the practical experience and professional knowledge that are abundant for many years in engineering application of such products, and together with the application of the theory, in order to create a forming method for a bolt structure at the root of a wind turbine blade, so that the method has higher practicability.
Disclosure of Invention
The invention provides a forming method for a bolt structure at the root part of a wind power blade, which can effectively ensure the quality of the root part of the blade, improve the connection reliability of a bolt sleeve and a composite material and the bearing capacity of a root bolt, and ensure the service life and the safety of a product.
In order to achieve the purpose, the invention adopts the technical scheme that: the method comprises the following steps:
a forming method for a bolt structure at the root part of a wind power blade comprises the following steps,
laying a fabric: laying at least one layer of fabric in a mold, wherein the edges of two end parts of the fabric are exposed outside the mold;
setting of the underfill: placing composite material filler in a cavity formed after the fabric is laid;
the arrangement of the metal thread insert: arranging a metal thread insert of a bolt structure on the placed composite material filler;
setting of top layer filler: arranging a composite material filler on the placed metal screw sleeve, wherein a prismatic structure with a rectangular cross section is obtained by wrapping the metal screw sleeve by the bottom-layer filler and the top-layer filler;
closing of the fabric edge: closing the edges of the two exposed end parts of the fabric, so as to circumferentially coat the prism structure;
molding: and forming the combined structure in the mold.
Further, when the fabric laid in the mold is larger than one layer, the seams among the fabrics are arranged in a staggered mode.
Further, there is an overlap at the seam of each fabric layer.
Further, the fabric is at least partially pre-shaped to conform to the shape of the inner wall of the forming cavity within the mold prior to being laid within the mold.
Further, the prism structure is a regular quadrangular prism structure.
Further, the composite material filler comprises an 1/4 cylindrical surface attached to the outer portion of the metal thread insert and two planes respectively connected with two ends of the cylindrical surface, and the two planes form a right-angle structure after being connected.
Further, the composite filler is a composite preformed body, and the molding matrix is fiber or fiber fabric.
Further, the exterior of the forming matrix is also coated with fiber fabric.
Further, the material of the composite material filler and the fabric is selected from one or more of glass fiber, carbon fiber, basalt fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, polyamide fiber, polyphenylene sulfide fiber, polyimide fiber, polyester fiber, polypropylene fiber or nylon fiber.
Further, the forming process is an RTM process, an HP-RTM process or a VARI process. .
Through the technical scheme, the invention has the beneficial effects that:
according to the invention, the bolt structure for the wind power blade is molded in the above manner, so that on one hand, the difficulty in the molding process can be reduced, the dimensional stability and precision after final molding can be ensured, a stable bolt structure form can be formed, the use strength of the bolt structure is ensured through the combination form of the composite material structure and the metal structure, the rotation condition in the wind power blade is avoided through the external prism structure, and the complete root form of the wind power blade can be formed through the parallel arrangement of a plurality of bolt structures.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for forming a wind turbine blade root bolt structure;
FIG. 2 is a schematic view of the fabric being laid in the mold in step S1;
FIG. 3 is a schematic diagram of the composite filler being placed in the cavity in step S2;
FIG. 4 is a schematic diagram of the metal insert being placed on the composite filler in step S3;
FIG. 5 is a schematic view of the composite filler being placed on the metal insert in step S4;
FIG. 6 is a schematic view of the fabric after the two end edges are closed in step S5;
FIGS. 7 and 8 are schematic views of two fabric seams;
FIG. 9 is an enlarged view of a portion of FIG. 2 at A;
FIG. 10 is a schematic view of laying down a fabric after only partial preforming;
FIG. 11 is a schematic representation of a fabric after being integrally preformed;
fig. 12 and 13 are schematic views of a prism structure of a regular quadrangular prism;
FIG. 14 is a schematic view of a prism structure that is a non-regular quadrangular prism;
FIGS. 15 and 16 are schematic diagrams of an optimization of the composite filler;
FIG. 17 is a schematic illustration of a composite preform with the shaped matrix being fibers;
FIG. 18 is a schematic representation of the forming matrix of the composite preform being a ribbon fiber fabric;
FIG. 19 is a schematic illustration of a composite preform with the shaped matrix being a laid-up stack of sheet-like fiber fabrics;
FIGS. 20 to 22 are schematic diagrams illustrating that the composite material preform in FIG. 17' 19 is coated by a fiber fabric layer;
FIG. 23 is a schematic of a 3D weave of a composite preform;
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Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. This embodiment is written in a progressive manner.
A forming method for a bolt structure at the root part of a wind power blade is shown in figure 1 and comprises the following steps,
s1, laying of a fabric 1: as shown in fig. 2, at least one layer of
s2, setting of bottom layer fillers: placing the
s3, setting of the metal thread insert 4: as shown in fig. 4, the metal thread insert 4 with a bolt structure is arranged on the placed
s4 setting of top-level filler: as shown in fig. 5, the
s5 closure of the fabric edges: as shown in fig. 6, the edges of the two exposed ends of the
s6 forming: and forming the combined structure in the mold, wherein the combined structure refers to the
Preferably, in the above embodiment, when the fabric laid in the mold is more than one layer, the seams between the fabrics are arranged in a staggered manner, so as to avoid local weak points on the bolt structure, thereby improving the overall strength of the bolt structure, and the two dislocation forms shown in figures 7 and 8 can achieve the technical purpose of the invention, the
Since the web has a certain flexibility, it is inevitable that the
The prism structure formed in step S4 may be a regular quadrangular prism as shown in fig. 12 and 13, or a non-regular quadrangular prism as shown in fig. 14, and all of them may be installed by being disposed in the root structure of the wind turbine blade, but in the use process, in the case of satisfying the size requirement of the
Preferably, in the above embodiment, the
As shown in fig. 23, in the 3D weaving process of the fiber, a core material is required, the core material may be selected from a foam structure, a composite material pultrusion structure, and the like to support the fabric, and the woven fabric covers the surface of the core material.
In the present invention, the material of the
The molding process in step S6 is an RTM process, an HP-RTM process or a VARI process, which can achieve the above purpose, and of course, other processes for achieving the molding purpose are also within the scope of the present invention.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
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