CN111022248A

CN111022248A - Prefabricated part of wind power blade root, blade root part, blade and manufacturing method thereof

Info

Publication number: CN111022248A
Application number: CN201911368379.0A
Authority: CN
Inventors: 唐金钱; 王向东; 张登刚; 鲁晓锋
Original assignee: Sinomatech Wind Power Blade Co Ltd
Current assignee: Sinomatech Wind Power Blade Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-04-17
Anticipated expiration: 2039-12-26
Also published as: CN111022248B

Abstract

The invention provides a prefabricated part of a wind power blade root, a blade root part, a blade and a manufacturing method thereof, wherein a plurality of prefabricated parts of the wind power blade root are manufactured; laying an outer layer fiber fabric in a blade root mould, placing a plurality of prefabricated parts on the outer layer fiber fabric, and splicing adjacent prefabricated parts; laying an inner layer fiber fabric on the spliced prefabricated member; and pouring towards the blade root mould and forming the blade root. Lay the layer with the part and prefabricate in advance, place again after the equipment shaping in the blade root mould with the common integrated into one piece of surplus layer, degree of difficulty and time when can reducing the later stage and filling the shaping adopt the superimposed mode of piecemeal, adopt the concatenation of multistage prefab in the hoop, the degree of difficulty of reduction equipment that can be great. Adopt standardized and modularization production, can make in advance, easy inspection control defect reduces the risk, can further promote production efficiency, can realize that different models are general, makes things convenient for standardized management.

Description

Prefabricated part of wind power blade root, blade root part, blade and manufacturing method thereof

Technical Field

The invention relates to the technical field of wind power generation devices, in particular to a prefabricated part of a wind power blade root, a blade root part, a blade and a manufacturing method thereof.

Background

Wind power generation is a resource utilization mode which develops the fastest speed in the world nowadays. The development of wind power blades as important components of wind power generators affects the development of the whole industry. With the expansion of the offshore market and the design of longer blades, the loads at the root of the blade become larger and larger, which puts higher demands on the production and processing of the root of the wind power blade. However, due to the fact that the diameter of the blade root is continuously enlarged, time and labor are wasted in assembling of the embedded part of the blade root, great difficulty is brought to operation of a worker, the height of a semi-circle at present even exceeds the height of the worker, and the assembling and production difficulty is great.

The Chinese patent application with the application number of CN201711013375.1 discloses a root structure of a wind power blade, a manufacturing method of the root structure and the wind power blade, wherein the root structure of the wind power blade comprises a body, a plurality of embedded parts and splicing parts. The body is made of a fiber reinforced composite material. A plurality of embedded pieces are arranged at intervals along the circumferential direction of the root structure. The splicing piece is spliced with the embedded pieces and embedded into the body, the splicing piece comprises a plurality of first splicing bodies and a plurality of second splicing bodies, the first splicing bodies and the embedded pieces are arranged at intervals one by one, and the second splicing bodies correspondingly abut against one ends of the embedded pieces, facing the top of the wind power blade, one by one; concave parts are formed on two sides of each first splicing body, and any embedded part and the second splicing body abutted against the embedded part are matched and attached to the concave parts on two sides of the adjacent first splicing bodies.

Chinese patent application No. CN201310064327.0, which discloses a blade insert for connecting a first blade segment to a second blade segment. The blade insert may include an aerodynamic shell extending between a first end configured to be connected to the first blade segment and a second end configured to be connected to the second blade segment. The aerodynamic shell may include a pressure side and a suction side extending between a leading edge and a trailing edge. Additionally, the aerodynamic body may be provided with a chord, wherein the chord at the first end is substantially equal to the chord at the second end. Namely, the blade is designed into different independent parts, each independent part is produced respectively, and finally, each part is spliced respectively, so that the blade is spliced into the whole blade and finally fused together through welding of thermoplastic materials or other modes.

In the above two patent applications, although a scheme of individually producing and then assembling each part of the blade is proposed, in the production and processing of the root structure, a plurality of split pieces and embedded pieces are still separately split in the assembling process, which results in that much time is consumed in the assembling process, and the production efficiency is low.

Disclosure of Invention

The invention aims to provide a prefabricated part of a wind power blade root, a blade root part, a blade and a manufacturing method thereof, and aims to solve the technical problem that the assembly and production difficulty of an embedded part in the prior art is high.

In order to achieve the purpose, the invention adopts the technical scheme that: there is provided a wind blade root preform comprising: the embedded part comprises an embedded part, a lower-layer base body, an upper-layer base body and an adhesive layer, wherein the lower-layer base body is a sheet body, two adjacent side edges of the lower-layer base body are respectively arranged along a first direction and a second direction, the extending direction of a plurality of embedded parts is the second direction, the embedded parts are arranged on the lower-layer base body along the first direction, and a first groove for accommodating the embedded parts is formed in the lower-layer base body; the upper-layer substrate is a sheet body and is covered on the embedded part; and the bonding layer is filled between the lower-layer matrix and the upper-layer matrix and is annularly arranged on the outer edge of the embedded part.

Further, the length of the lower layer substrate in the first direction is greater than the length of the upper layer substrate in the first direction.

Furthermore, a second groove for accommodating the embedded part is formed in the upper-layer base body, and the first groove and the second groove are arranged oppositely.

Further, the first groove and the second groove enclose to form a circle or an ellipse.

Further, the embedded part is a bolt sleeve, and the length of the upper base body in the first direction is greater than the length of the embedded part in the first direction.

Furthermore, a plurality of filling pieces are further arranged on the lower-layer base body, and the filling pieces and the embedded pieces are spliced and embedded in the first groove together.

Furthermore, the filling part comprises a filling rod spliced with the embedded part and filling lugs arranged on two opposite sides of the filling rod, and the filling lugs of the adjacent filling part are abutted.

Further, the lower substrate includes a first portion for receiving an embedment and a second portion for receiving a filler, the first portion and the second portion having different thicknesses.

Furthermore, one end, far away from the embedded part, of the lower-layer base body is provided with an inclined guide surface, and the thickness of one side, far away from the embedded part, of the lower-layer base body is smaller than that of one side, close to the embedded part, of the lower-layer base body; the filler part becomes thinner towards one end far away from the embedded part.

Further, one end, far away from the embedded part, of the upper-layer base body is provided with an inclined surface extending to the filling part.

The invention also discloses a blade root part which comprises an outer layer fiber fabric, an inner layer fiber fabric and a plurality of prefabricated parts which are spliced with each other and used for the blade root of the wind power blade, wherein the outer layer fiber fabric and the inner layer fiber fabric are respectively coated on two opposite sides of the prefabricated parts.

The invention also discloses a wind power blade which comprises a blade tip part, a blade body part and the blade root part, wherein the blade root part comprises the prefabricated part.

The invention also discloses a method for manufacturing the blade root or the blade, which comprises the following steps:

manufacturing a plurality of prefabricated parts of the wind power blade root;

laying an outer layer fiber fabric in a blade root mold or a blade mold, placing a plurality of prefabricated parts on the outer layer fiber fabric, and splicing the adjacent prefabricated parts;

laying an inner layer fiber fabric on the spliced prefabricated member;

and filling and molding a blade root or a blade in the blade root mold or the blade mold.

Further, the splicing mode between the prefabricated members can be aligned splicing or staggered splicing.

The prefabricated part of the wind power blade root, the blade root part, the blade and the manufacturing method thereof have the advantages that: compared with the prior art, lay the layer with the part and prefabricate in advance, place again after the equipment shaping in the blade root mould with the common integrated into one piece of surplus layer, degree of difficulty and time when can reducing the later stage and filling the shaping adopt the superimposed mode of piecemeal, adopt the concatenation of multistage prefab in the hoop, the degree of difficulty of reduction equipment that can be great. Meanwhile, the prefabricated member can be produced in a standardized and modularized mode, can be manufactured in advance, is easy to inspect and control defects, reduces risks, can further improve the production efficiency, can realize universality of different models and is convenient for standardized management.

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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural view of a mold process of a preform production method according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a prefabricated part produced by the method for producing a prefabricated part for a root of a wind turbine blade according to an embodiment of the present invention;

FIG. 3 is a schematic view of another angular perspective of the preform shown in FIG. 2, wherein the upper substrate is not shown;

FIG. 4 is a first schematic front view of the preform shown in FIG. 2, the preform being spliced in alignment;

FIG. 5 is a schematic diagram of a second front view of the prefabricated member shown in FIG. 2, wherein the prefabricated member is spliced in a staggered manner;

FIG. 6 is a schematic view of the extrusion molding structure of the upper substrate and the lower substrate in the preform production method according to the embodiment of the present invention;

FIG. 7 is a schematic perspective view of a mold used in an embodiment of the present invention;

fig. 8 is a schematic view of a blade root member according to an embodiment of the present invention.

Description of reference numerals:

1. embedding parts; 2. a lower substrate; 3. an upper substrate; 4. an adhesive layer; 5. filling member

(ii) a 6. A mold; 7. an outer layer of fibrous fabric; 8. an inner layer of fabric; 21. a first groove; 22. an inclined guide surface; 23. a second fixed cross-section; 24. a baseline; 31. a second groove; 32. an inclined surface; 33. a first fixed cross-section; 34. a baseline; 51. filling the rods; 52. filling the lug; 61. an upper die; 62. a lower die; 611. a fourth groove; 621. a third groove; 6111. a first groove section; 6112. a second groove segment.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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; they may be connected directly or indirectly through intervening media, or they 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.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

Referring to fig. 1 to 5, a method for producing a wind turbine blade root preform according to the present invention will now be described. The production method of the wind power blade root prefabricated part comprises the following steps:

s1, preforming an upper-layer matrix 3 and a lower-layer matrix 2, wherein the upper-layer matrix 3 and the lower-layer matrix 2 are both sheets, and a plurality of first grooves 21 are formed in the lower-layer matrix 2;

s2, placing the lower-layer base body 2 in a mold 6, placing a plurality of embedded parts 1 in the first grooves 21, and buckling the upper-layer base body 3 on the embedded parts 1, wherein the first grooves 21 and the second grooves 31 are oppositely arranged and surround the outer sides of the embedded parts 1;

s3, respectively coating adhesives on the lower-layer base body 2 and the upper-layer base body 3, and realizing adhesion with the embedded part 1, so that the upper-layer base body 3, the embedded part 1 and the lower-layer base body 2 can be adhered to form an assembly; the adhesive coating time may be to coat a layer of adhesive on the lower substrate 2 before the embedded part 1 is placed on the lower substrate 2, and to coat the adhesive on the embedded part 1 or on the bottom of the upper substrate 3 when the upper substrate 3 is fastened to the embedded part 1.

S4, solidifying and molding the assembled assembly in the mold 6, and manufacturing a molded prefabricated part.

Compared with the prior art, the production method of the prefabricated part of the blade root of the wind power blade has the advantages that the upper-layer base body 3 and the lower-layer base body 2 are prefabricated and formed in advance, then the upper-layer base body 3, the lower-layer base body 2 and the embedded part 1 are placed in the mold 6 to be assembled and formed, heating and curing are uniformly carried out, integral filling is not needed during later-stage processing, filling quality is higher, difficulty and time during later-stage filling and forming can be reduced, defect rate is reduced, and integral height consistency can be guaranteed. Can take shape respectively with upper matrix 3 and lower floor's base member 2, save time that can be great improves production efficiency to the prefab of processing out can be deposited and assemble by segmentation, adopts the superimposed mode of piecemeal on the thickness direction, adopts the concatenation of multistage prefab in the hoop, the degree of difficulty of reduction equipment that can be great. Meanwhile, the prefabricated member can be produced in a standardized and modularized mode, can be manufactured in advance, is easy to inspect and control defects, reduces risks, can further improve the production efficiency, can realize universality of different models and is convenient for standardized management. Upper strata base member 3 and lower floor's base member 2 are the machine-shaping in advance this moment, and adhesive linkage 4 is used for realizing the fixed connection between upper strata base member 3, built-in fitting 1 and the lower floor's base member 2 for the later stage filler, and its production mode is simple, and can the pre-production manufacturing, and single volume is less, can adjust the size of prefabricated whole prefab according to the demand, and easy inspection control defect reduces the risk.

The structure of the prefabricated member produced by adopting the prefabricated member production method is as follows: the prefabricated part comprises an embedded part 1, a lower-layer base body 2, an upper-layer base body 3 and an adhesive layer 4, wherein the lower-layer base body 2 is a sheet body, two adjacent side edges of the lower-layer base body are arranged along a first direction and a second direction respectively, the extending direction of a plurality of embedded parts 1 is the second direction, the embedded parts 1 are arranged on the lower-layer base body 2 along the first direction, and a first groove 21 clamped at the outer edge of the embedded parts 1 is formed in the lower-layer base body 2; the upper-layer base body 3 is a sheet body, and the upper-layer base body 3 is covered on the embedded part 1; the bonding layer 4 is filled between the lower-layer base body 2 and the upper-layer base body 3 and is annularly arranged on the outer edge of the embedded part 1.

The embedded part 1 can be a nut, a bolt limiting part, a foam filling part, a wooden object, a spacing part, a three-dimensional fiber structure and other parts which need to be embedded along with the formation of the blade root. It will be appreciated that the embedment 1 is a pre-formed part prior to assembly, and that, to facilitate assembly and to improve the interface bonding strength, the surface thereof is treated accordingly, such as winding fibers or yarns, attaching peelable layers, surfacing, applying resins or adhesives. Specifically, the embedded part 1 refers to a bolt structure arranged along the circumferential direction of the blade root at intervals, and is used for connecting the blade with the hub of the wind driven generator through bolts. The first direction and the second direction are two mutually perpendicular directions on a horizontal plane, and the arrangement extending direction of the embedded parts 1 is perpendicular to the length extending direction of the first groove 21, namely, the embedded parts 1 are uniformly arranged on the lower-layer base body 2 at intervals.

A second groove 31 clamped to the outer edge of the embedded part 1 may be formed in the upper substrate 3, and the first groove 21 and the second groove 31 are arranged oppositely. The first grooves 21 are uniformly arranged along the first direction of the lower-layer base body 2, and the length direction of the first grooves 21 is the second direction which is consistent with the length direction of the lower-layer base body 2; the second grooves 31 are also uniformly arranged along the first direction of the upper substrate 3, and the first groove 21 and the second groove 31 are oppositely arranged and enclosed into a through hole in which the embedded part 1 is embedded. The first concave groove 21 and the second concave groove 31 may be formed by bending a sheet of the lower substrate 2 or a sheet of the upper substrate 3 into a wave-shaped sheet, or may be formed by directly forming a concave groove in the sheet of the lower substrate 2 or the sheet of the upper substrate 3. Of course, according to actual conditions and specific requirements, in other embodiments of the present invention, the upper substrate 3 may also be directly fastened to the embedded part 1, without forming the second groove 31 on the upper substrate 3, and the shape of the embedded part 1 may be a semicircle or a square, etc., which is not limited herein.

Specifically, the embedded part 1 is a bolt structure arranged along the circumferential direction of the blade root at intervals and used for realizing fixed connection with the blade, the cross section of the embedded part 1 is generally a cylindrical ring body and is directly processed by adopting a standard part, and the embedded part 1 can also be an embedded part 1 with a flat cylinder shape, a square main body shape or other polygonal cross section; the adhesive may be any material, such as adhesive, resin, prepreg fiber, or the like, or may be any other material capable of integrating a plurality of sub-components, such as an epoxy adhesive.

The upper matrix 3 and/or the lower matrix 2 are preformed reinforced fiber components, which are manufactured by impregnating fibers with resin and curing, for example, by a prepreg process, a pultrusion process, or a continuous molding process. The fiber is mainly made of one or a combination of glass fiber, carbon fiber, natural fiber, polyester fiber, polyamide fiber, and the like, and the resin can be any thermosetting resin or thermoplastic resin such as epoxy resin, phenolic resin, unsaturated polyester, thermosetting resin, polyolefin, polyester resin, polyamide resin, and the like. Preferably, the upper substrate 3 and the lower substrate 2 are both pre-processed and formed sheet bodies, which are respectively covered on the upper side and the lower side of the embedded part 1, the material is preferably multi-axial fiber and thermosetting resin, and the surfaces of the upper substrate 3 and the lower substrate 2 need to be paved with release cloth or other surface roughening methods to ensure roughness, such as sand blasting, sanding, grinding, corona treatment, plasma treatment, etc.

Preferably, the cross section of the embedded part 1 is circular or elliptical, and the first groove 21 and the second groove 31 enclose to form a circle or an ellipse. Specifically, the cross section of the embedded part 1 is generally circular or elliptical, that is, the embedded part 1 is a circular cylinder, and the inner surface of the embedded part 1 is provided with internal threads, and a bolt can be inserted into a through hole in the embedded part 1, thereby realizing the connection of the bolt. The first groove 21 and the second groove 31 are oppositely arranged, that is, the two first grooves 21 and the second grooves 31 for enclosing the same embedded part 1 are oppositely arranged, and two side edges of the first groove 21 and the second groove 31 can be connected, so that the first groove 21 and the second groove 31 are spliced into a circular shape. The diameter of the inner circle of the circle formed by splicing the first groove 21 and the second groove 31 is slightly larger than or equal to the diameter of the outer circle of the embedded part 1, so that the fixing stability of the embedded part 1 is ensured. The number of the first grooves 21 and the second grooves 31 may be equal or different, and the upper substrate 3 and the lower substrate 2 may be disposed in a staggered manner, for example, such that the first groove 21 of the upper substrate 3 and the second groove 31 of the lower substrate 2 are disposed opposite to each other. Of course, according to practical situations and specific requirements, in other embodiments of the present invention, the cross section of the embedded part 1 has a square shape, and the first groove 21 and the second groove 31 are formed into a square shape by splicing together, which is not limited herein.

Further, referring to fig. 6, as a specific embodiment of the method for producing the wind turbine blade root preform provided by the present invention, both the upper substrate 3 and the lower substrate 2 are formed by pultrusion, or only one of the upper substrate 3 or the lower substrate 2 is formed by pultrusion. Specifically, pultrusion is a process method for producing a composite material profile by impregnating continuous fibers or fabrics thereof with resin under the traction of a traction device and heating the resin through a forming die to cure the resin, and the specific processing technology is a conventional technology in the prior art. The upper-layer matrix 3 and the lower-layer matrix 2 are generally made of multi-axial fibers and thermosetting resin, can be molded in a pultrusion mode, can be directly molded without cutting, and can save more materials. Of course, according to practical situations and specific needs, in other embodiments of the present invention, the upper substrate 3 and/or the lower substrate 2 may be formed by other methods such as vacuum infusion molding or mold pressing, which are not limited herein.

Further, referring to fig. 2, fig. 3 and fig. 6, as an embodiment of the method for producing the wind turbine blade root prefabricated member according to the present invention, the upper base body 3 has a first fixed cross section 33, and the upper base body 3 is formed by pultrusion from the first fixed cross section 33 along a base line 34; the lower substrate 2 has a second fixed cross-section 23, and the lower substrate 2 is pultruded from the second fixed cross-section 23 along the base string 24. Specifically, the base strings 24 and 34 are disposed perpendicular to the direction of the first and second fixed cross-sections 33 and 23, and the first and second fixed cross-sections 33 and 23 may be pultruded along the extending direction of the base strings 24 and 34. Wherein, the pultrusion direction can be along the first direction pultrusion or along the second direction pultrusion, only need to be able to form the shape of the upper base body 3 and the lower base body 2.

Preferably, referring to fig. 2, fig. 3 and fig. 6, as an embodiment of the method for producing a wind turbine blade root preform according to the present invention, the length directions of the first fixing section 33 and the second fixing section 23 are consistent with the length direction of the first groove 21, and the

base lines

24 and 34 are perpendicular to the first fixing section 33 and the second fixing section 23. That is, in the case where the longitudinal direction of the first fixed cross section 33 and the second fixed cross section 23 is the second direction and then the extending direction of the base line is the first direction, the shape of the first fixed cross section 33 may be matched to the longitudinal sectional shape of the upper substrate 3 in the second direction and the shape of the second fixed cross section 23 may be matched to the longitudinal sectional shape of the lower substrate 2 in the second direction, and therefore, the stretch molding may be performed at one time. Wherein, the shape of

baseline

24 and 34 is formed by splicing a plurality of semicircles in proper order, and the junction between the semicircle has the transition circular arc, first fixed cross-section 33 and second fixed cross-section 23 can form the plate body that has a plurality of recess along this

baseline

24 and 34, the semicircle department of

baseline

24 and 34 is first recess 21 and second recess 31 in this application promptly, the quantity of semicircle is the same with first recess 21, second recess 31 and the quantity of built-in fitting 1, built-in fitting 1 can inlay the inside of locating this first recess 21 and second recess 31.

Of course, in other embodiments of the present invention, the extending direction of the first fixing section 33 and the second fixing section 23 may also be along the second direction, the

base line

34 or 24 extends along the first direction, and the shape of the first fixing section 33 and the second fixing section 23 may be several semicircles which are spliced in sequence, at this time, the lower substrate 2 having the first groove 21 and the upper substrate 3 having the second groove 31 may also be stretched, and then the first substrate and the second substrate may be further processed by cutting or grinding, which is not limited herein.

Further, referring to fig. 2, fig. 3 and fig. 6, as an embodiment of the method for producing a wind turbine blade root preform according to the present invention, the first fixed cross section 33 and the second fixed cross section 23 are both trapezoidal, one side of the first fixed cross section 33 and one side of the second fixed cross section 23 are perpendicular to the bottom side, the other side is inclined to the bottom side, and the length of the bottom side is greater than the length of the top side. Specifically, the first fixed cross section 33 and the second fixed cross section 23 are both right-angled trapezoids, and one side of the first fixed cross section 33 and the second fixed cross section 23 close to the embedded part 1 is of a right-angled structure, and one side of the first fixed cross section 33 and the second fixed cross section 23 far away from the embedded part 1 is obliquely arranged. That is, the inclined guide surface 22 is formed on one side surface of the lower base body 2 far away from the embedded part 1, the inclined guide surface 22 is a slope for transition, so that the phenomenon of stress concentration when one end of the lower base body 2 far away from the embedded part 1 is connected with other parts of the blade can be avoided, and the damage to the end part of the lower base body 2 is avoided.

Further, referring to fig. 2, 3 and 6, as an embodiment of the method for producing the wind turbine blade root preform according to the present invention, the length of the first fixed section 33 is smaller than the length of the second fixed section 23. Specifically, the lengths of the first fixed cross section 33 and the second fixed cross section 23 are equal to the lengths of the upper substrate 3 and the lower substrate 2 in the second direction, that is, the length of the lower substrate 2 in the second direction is greater than the length of the upper substrate 3 in the second direction, the length of the upper substrate 3 in the second direction is greater than the length of the embedded part 1 in the second direction, the length of the lower substrate 2 is greater than the length of the upper substrate 3, and the upper substrate 3 can completely cover the embedded part 1, so that a stable and complete filling effect can be achieved during later injection molding and filling. The lower-layer base body 2 is longer in length, so that the connection with the blades can be conveniently realized, the area of the connection surface between the blade root and the blades is enlarged, and a better connection effect is achieved. Because the lengths of the embedded part 1 and the upper-layer base body 3 are both short, the embedded part 1 and the upper-layer base body 3 are both arranged at one end of the lower-layer base body 2. Preferably, the thickness of the upper substrate 3 is the same as the thickness of the lower substrate 2.

Further, referring to fig. 3, as a specific embodiment of the method for producing the prefabricated blade root of the wind turbine blade according to the present invention, the method further includes the following steps:

s3.1, after the embedded part 1 is placed in the first groove 21, a filling part 5 is arranged on one side of the embedded part 1, and the filling part 5 and the embedded part 1 are spliced and embedded in the first groove 21 together. Specifically, the material of the filling member 5 is generally foam or other material which is light in weight and can realize filling, and is also arranged in the first groove 21, the filling member 5 includes a filling rod 51 spliced with the embedded part 1 and filling lugs 52 arranged on two opposite sides of the filling rod 51, and the filling lugs 52 of the adjacent filling members 5 are abutted. The thickness of the filling rod 51 is the same as that of the embedded part 1, or the thickness of the filling rod 51 is larger than that of the embedded part 1. The filling rod 51 is arranged at one end of the embedded part 1, and the filling lugs 52 are arranged at two opposite sides of the filling rod 51, so that the filling rod 51 can be prevented from rotating, and the positioning effect can be achieved. The filling lugs 52 are protruding from two ends of the filling rod 51, two side ends of the first groove 21 and two side ends of the second groove 31 can be respectively abutted against the filling lugs 52, and a supporting effect can be achieved for a position between the first groove 21 and the second groove 31. It will be appreciated that the filler pieces 5 may also include spacers extending between adjacent embedments 1, such as fiberglass, foam spacers, etc. that are preformed to match the embedment shape.

Wherein the sum of the length of the filling part 5 and the length of the embedded part 1 is less than the length of the first groove 21. Specifically, the embedded part 1 is arranged at one end of the first groove 21, and the filling part 5 is arranged close to the end of the embedded part 1 and extends to the other end of the first groove 21, so that the filling and supporting effects are achieved. The length of the first groove 21 is slightly greater than the total length of the filling part 5 and the embedded part 1, so that a good coating effect can be ensured.

Because the end of the lower-layer base body 2, which is far away from the embedded part 1, is provided with the inclined guide surface 22, the thickness of the filling part 5 at the end, which is far away from the embedded part 1, becomes thinner, namely the thickness of the filling part 5 at the end, which is far away from the embedded part 1, becomes thinner. The filler 5 is also formed with an inclined surface 32 at the end portion, thereby playing a role of supporting the auxiliary filling support. Wherein, the structure of whole filler 5 is the slope gradually, and the thickness of the filler 5 towards one side of slope guide surface 22 more is thinner more, both can make things convenient for the dismouting between whole prefab and the blade mould this moment, can also avoid the damage that stress concentration caused.

The tail end of the upper base body 3 is also provided with an inclined surface 32, the inclined surface 32 is used for completely coating the embedded part 1, one end of the inclined surface 32 is positioned on the embedded part 1, the other end of the inclined surface extends to the filling part 5, and the connecting part between the embedded part 1 and the filling part 5 can be shielded, so that the connecting stability between the embedded part 1 and the filling part 5 is ensured.

In order to make the whole prefabricated member lighter in weight, the upper-layer base body 3 and the lower-layer base body 2 are made of materials with stronger strength, such as limiting composite reinforcing materials, and the like, but the whole prefabricated member is heavier in weight, the filling piece 5 is made of materials with lighter weight, such as foam, and the like, and therefore the volume of the filling piece 5 needs to be increased and the volume of the upper-layer base body 3 and the volume of the lower-layer base body 2 need to be reduced, so that the cross section size of the filling piece 5 can be larger than that of the embedded piece 1, and in order to match different sizes of the filling piece 5 and the embedded piece 1, the outer edges of the whole upper-layer base body 3 and the whole lower-layer base body 2 are in smooth and uniform transition, so that the corresponding thicknesses of the upper-layer base body 3 and the lower-layer base body 2 can be different; it may also comprise a second portion, matching the filler element 5, of lower thickness. Of course, the thickness of the first portion and the second portion may be consistent according to actual conditions and specific requirements, and is not limited herein.

In order to further reduce the weight of the whole preform, filling extension pieces (not shown) may be further provided between adjacent embedments 1, and the filling extension pieces may be separately provided or formed by extending the filling pieces 5. Because the material weight of upper strata base member 3 and lower floor's base member 2 is heavier, and because upper strata base member 3 and lower floor's base member 2 that are located between two adjacent built-in fittings 1 probably have the clearance because reasons such as machining precision, need fill it when filling or bonding to this clearance later stage, but the weight of filler is petitious, adopt the filling that the quality is lighter to extend the weight that the piece can reduce whole prefab, and the material of filling extension is the same with filler 5, can adopt foam or other texture lighter and can realize the material of filling.

Example 2

The invention also provides another production method of the wind power blade root prefabricated part, which is different from the embodiment 1 in that: in step S3, the lower substrate 2, the embedded part 1, and the upper substrate 3 are stacked in advance, and then the adhesive is filled toward the space between the upper substrate 3 and the lower substrate 2, so that the adhesion between the upper substrate 3, the embedded part 1, and the lower substrate 2 can be achieved. Compared with the mode of coating the adhesive for multiple times in the embodiment 1, the operation is simpler.

Example 3

Referring to fig. 1 and 7, the invention further provides a mold 6 applied to a production method of a wind turbine blade root prefabricated member, where the mold 6 includes a lower mold 62 for accommodating the lower substrate 2 and an upper mold 61 for accommodating the upper substrate 3, a plurality of third grooves 621 attached to the lower surface of the lower substrate 2 are formed in the lower mold 62, a plurality of fourth grooves 611 attached to the upper surface of the upper mold 61 are formed in the upper mold 61, and an embedded part 1 is wrapped between the upper substrate 3 and the lower substrate 2. The mould 6 provided by the invention can be used for placing the whole prefabricated part in the mould 6 for production and processing, and the height of the whole prefabricated part can be uniformly controlled through the standardized mould 6, so that the standard property and the uniformity of processing are ensured. Carry out hot pressing in advance through this mould 6, can improve production efficiency on the basis that does not occupy the blade mould.

Wherein, the lower die 62 and the upper die 61 are arranged oppositely, the third groove 621 and the fourth groove 611 are also arranged oppositely, and the lower die 62 is clamped on the lower surface of the lower substrate 2, because the lower surface of the lower substrate 2 also has a plurality of protrusions matched with the first groove 21, the lower die 62 is provided with a plurality of third grooves 621 matched with the protrusions; the upper mold 61 is engaged with the upper surface of the upper substrate 3, and since the upper surface of the upper substrate 3 also has a plurality of protrusions engaged with the second grooves 31, the upper mold 61 is provided with a plurality of fourth grooves 611 engaged with the protrusions. At this time, the third recess 621 and the fourth recess 611 are also disposed in a one-to-one correspondence.

The upper die 61 and the lower die 62 can be opened and closed with each other, and preferably, the upper die 61 is hinged with the lower die 62. That is, the upper mold 61 and the lower mold 62 may be two relatively independent molds, or the upper mold 61 and the lower mold 62 may be combined together, that is, the lower mold 62 may be kept stationary, and then the upper mold 61 may be movably fastened to the lower mold 62, wherein the connection manner between the upper mold 61 and the lower mold 62 may also be a rotational connection, a snap connection, or the like; alternatively, the upper mold 61 may be kept stationary, and the lower mold 62 may be movably engaged with the upper mold 61, which is not limited herein.

Wherein the third groove 621 comprises a first groove section 6111 engaged with the upper substrate 3 and a second groove section 6112 engaged with the filling member 5, an inclined surface 32 is formed at the joint of the first groove section 6111 and the second groove section 6112, the inclined surface 32 is used for being attached to the inclined surface 32 at the tail end of the upper substrate 3,

since the length of the upper substrate 3 is smaller than that of the lower substrate 2, the rear half of the lower substrate 2 is in contact with the upper mold 61 via the filler 5, and the filler 5 is also formed with the inclined guide surface 22 corresponding to the start position and curvature of the inclined guide surface 22 at a position opposite to the inclined guide surface 22, that is, the inclined convex surface of the third recess 621 may be opposite to the inclined guide surface 22, that is, the start position, curvature of the inclined guide surface 22, and the like may be identical to the inclined guide surface 22 of the lower substrate 2. The fit between the upper mould 61 and the entire preform can now be better achieved.

Wherein, the mould 6 is also provided with other auxiliary pouring components, such as a heating element and a control element, if the adhesive is resin, vacuum pouring may be needed, and therefore, the mould 6 is also provided with necessary equipment such as a vacuum port and a vacuum gauge connected with a vacuum machine.

Example 4

The invention also provides a blade root part which comprises an outer layer fiber fabric 7, an inner layer fiber fabric 8 and a plurality of prefabricated parts of the wind power blade root, wherein the prefabricated parts are spliced with one another and are used for the wind power blade root in the embodiment 1 or the embodiment 2, and the outer layer fiber fabric 7 and the inner layer fiber fabric 8 are respectively coated on two opposite sides of the prefabricated parts. The number of the prefabricated members can be multiple, the multiple prefabricated members can be spliced between the outer-layer fiber fabric 7 and the inner-layer fiber fabric 8, and the splicing method can be aligned splicing or staggered splicing.

Example 5

Referring to fig. 8, the present invention further provides a method for manufacturing a blade root, the method comprising the steps of:

s5, manufacturing a plurality of prefabricated parts of the wind power blade root in any one of the embodiments by adopting the steps from S1 to S4;

s6, laying an outer layer fiber fabric 7 in a blade root mold, and sequentially splicing a plurality of prefabricated parts; the structure and the using method of the blade root mould are the prior art, the outer layer fiber fabric 7 is laid in the blade root mould, the outer layer fiber fabric 7 is generally an external protective layer, and then the prefabricated part is placed on the outer layer fiber fabric 7;

when the prefabricated parts are assembled, all the prefabricated parts can be sequentially fixed on a flange (not shown) on the ground, and then the whole assembled prefabricated parts are uniformly hoisted to the outer-layer fiber fabric 7; or the assembled prefabricated member can be directly arranged on the outer-layer fiber fabric 7, and then the prefabricated member is sequentially assembled on the assembled outer-layer fiber fabric 7 and fixed on the flange, which is not limited herein.

S7, laying an inner-layer fiber fabric 8 on the spliced prefabricated member; the inner layer of fabric 8 is laid on the inner surface of the preform, which can protect the inner surface of the preform, and the combination of the inner layer of fabric 8 and the outer layer of fabric 7 can also ensure the effect of injection molding.

S8, pouring and forming the blade root into the blade root mold; the pouring forming mode is the prior art, and the inner layer fiber fabric 8, the outer layer fiber fabric 7 and the prefabricated member can form an integrated structure, so that the connecting effect is ensured.

Lay the layer with the part and prefabricate in advance, place again after the equipment shaping in the blade mould with the common integrated into one piece of surplus layer, degree of difficulty and time when can reducing the later stage and filling the shaping adopt the superimposed mode of piecemeal, adopt the concatenation of multistage prefab in the hoop, the degree of difficulty of reduction equipment that can be great. Meanwhile, the prefabricated member can be produced in a standardized and modularized mode, can be manufactured in advance, is easy to inspect and control defects, reduces risks, can further improve the production efficiency, can realize universality of different models and is convenient for standardized management.

The molded blade root part can be directly spliced with the blade tip part and the blade body part at the later stage or poured and molded again after being spliced, so that the complete blade is molded. The adoption now with the mode of blade root preforming, can make things convenient for the equipment and the shaping in later stage.

Further, referring to fig. 3 and 4, as an embodiment of the blade manufacturing method provided by the present invention, the splicing manner between the preforms may be an aligned splicing manner or a staggered splicing manner. Specifically, when the prefabricated parts are assembled, the prefabricated parts can be assembled in an aligned mode, namely the tail end of the front prefabricated part and the head end of the rear prefabricated part are directly assembled in an aligned mode, and the assembling mode is simple; the staggered splicing is that a section of upper-layer matrix 3 or lower-layer matrix 2 is reserved at the tail end of the former prefabricated member, a part of unsealed area exists on the latter prefabricated member, and the reserved upper-layer matrix 3 or lower-layer matrix 2 can be connected with the reserved unstitched area, but the operation is complex. Of course, according to the actual situation and the specific requirement, in other embodiments of the present invention, other splicing manners may also be adopted, and the present invention is not limited herein.

Example 6

The invention also provides a wind power blade, which comprises a blade tip part, a blade body part and a blade root part, wherein the blade root part comprises the prefabricated part disclosed in the embodiment 3.

Example 7

Referring to fig. 8, the present invention further provides a method for manufacturing a blade, which is different from the method for manufacturing a blade root in embodiment 5 in that: directly laying an outer-layer fiber fabric 7 in a blade mould, then sequentially splicing a plurality of prefabricated parts, and laying an inner-layer fiber fabric 8 on the spliced prefabricated parts; and then arranging the relevant parts of the blade tip part and the blade body part in a blade mould, and pouring and forming the blade in the blade mould.

At the moment, the blade mold is directly used for production and processing, so that the filling process can be saved, and the connection tightness among the blade root part, the blade tip part and the blade body part is ensured.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. Prefabricated part of wind power blade root, its characterized in that includes:

an embedded part (1);

the lower-layer base body (2) is a sheet body, two adjacent side edges of the lower-layer base body are respectively arranged along a first direction and a second direction, the extending direction of the embedded parts (1) is the second direction, the embedded parts (1) are arranged on the lower-layer base body (2) along the first direction, and first grooves (21) for containing the embedded parts (1) are formed in the lower-layer base body (2);

the upper-layer base body (3) is a sheet body, and the upper-layer base body (3) is covered on the embedded part (1); and

and the bonding layer (4) is filled between the lower-layer base body (2) and the upper-layer base body (3) and is annularly arranged on the outer edge of the embedded part (1).

2. The wind blade root preform as claimed in claim 1, wherein: the length of the lower-layer substrate (2) in the first direction is greater than the length of the upper-layer substrate (3) in the first direction.

3. The wind blade root preform as claimed in claim 1, wherein: and a second groove (31) for accommodating the embedded part (1) is formed in the upper-layer base body (3), and the first groove (21) and the second groove (31) are arranged oppositely.

4. The wind blade root preform as claimed in claim 3, wherein: the first groove (21) and the second groove (31) are enclosed to form a circle or an ellipse.

5. The wind blade root preform as claimed in any one of claims 1 to 4, wherein: the embedded part (1) is a bolt sleeve, and the length of the upper-layer base body (3) in the first direction is larger than that of the embedded part (1) in the first direction.

6. The wind blade root preform as claimed in claim 5, wherein: the lower-layer base body (2) is further provided with a plurality of filling pieces (5), and the filling pieces (5) are spliced with the embedded pieces (1) and are embedded in the first grooves (21) together.

7. The wind blade root preform as claimed in claim 6, wherein: the filling part (5) comprises filling rods (51) spliced with the embedded part (1) and filling lugs (52) arranged on two opposite sides of each filling rod (51), and the filling lugs (52) of the adjacent filling parts (5) are abutted.

8. The wind blade root preform as claimed in claim 6, wherein: the lower-layer base body (2) comprises a first part for accommodating the embedded part (1) and a second part for accommodating the filling part (5), and the first part and the second part have different thicknesses.

9. The wind blade root preform as claimed in claim 6, wherein: one end, far away from the embedded part (1), of the lower-layer base body (2) is provided with an inclined guide surface (22), and the thickness of one side, far away from the embedded part (1), of the lower-layer base body (2) is smaller than that of one side, close to the embedded part (1), of the lower-layer base body (2); the thickness of the filling part (5) is thinner towards one end far away from the embedded part (1).

10. The wind blade root preform as claimed in claim 6, wherein: one end, far away from the embedded part (1), of the upper-layer base body (3) is provided with an inclined surface (32) extending to the filling part (5).

11. A root member, characterized by: the wind blade root preform comprises an outer layer fiber fabric (6), an inner layer fiber fabric (7) and a plurality of mutually spliced wind blade root preforms according to any one of claims 1 to 10, wherein the outer layer fiber fabric (7) and the inner layer fiber fabric (8) are respectively coated on two opposite sides of the preforms.

12. Wind-powered electricity generation blade, its characterized in that: comprising a tip portion, a body portion and a root portion, the root portion comprising a preform according to any one of claims 1 to 10.

13. A method of manufacturing a blade root or blade, comprising the steps of:

manufacturing a number of prefabricated parts for a wind blade root according to any of claims 1 to 10;

laying an outer layer fiber fabric (7) in a blade root mold or a blade mold, placing a plurality of prefabricated parts on the outer layer fiber fabric (7), and splicing the adjacent prefabricated parts;

laying an inner layer fiber fabric (8) on the spliced prefabricated member;

14. The method of manufacturing a blade according to claim 13, wherein: the splicing mode between the prefabricated members can be aligned splicing or staggered splicing.