CN113119495A

CN113119495A - Blade shell preparation method and blade

Info

Publication number: CN113119495A
Application number: CN202110362599.3A
Authority: CN
Inventors: 吕兵; 张艳秋; 牛娟娟; 宋秋香; 苏成功
Original assignee: Sinomatech Wind Power Blade Co Ltd
Current assignee: Sinomatech Wind Power Blade Co Ltd
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2021-07-16
Also published as: BR112023005607A2; WO2022206155A1

Abstract

A preparation method of a blade shell and a blade. A method of making a blade shell, comprising: providing a plurality of pultruded strips; stacking a plurality of pultrusion strips into a main beam; fixing at least one pair of limiting devices with the blade mould; placing the main beam between each pair of limiting devices; laying a core material on a blade mould; pouring and curing to form a shell; and separating the shell from the blade mould to obtain the blade shell. This application sets up stop device in blade mould, places after blade mould at the girder, and when fixing device pulled down, prevent through stop device that pultrusion strip from appearing the displacement or warping to make the girder can keep anticipated shape, avoid introducing the structural strength that foreign matters such as strapping rope influenced the blade.

Description

Blade shell preparation method and blade

Technical Field

The application belongs to the technical field of wind power blade preparation, and particularly relates to a blade shell preparation method.

Background

In recent years, a main beam of a wind power blade is prepared by adopting a pultrusion process and is formed with a shell in one step, but after the main beam is laid and a bundling tool is removed, the molded surface of a die is arc-shaped, and the plate has certain rigidity, so that the plate is difficult to be attached to the die, and the plate at the end part of the main beam is opened to cause overlarge gaps.

Disclosure of Invention

The embodiment of the application provides a preparation method of a blade shell, which can avoid introducing a binding foreign matter into a main beam, can avoid opening gaps between tension and extrusion strips while removing a binding tool, and accordingly improves the strength of the main beam.

In a first aspect, an embodiment of the present application provides a method for manufacturing a blade shell, which is used for manufacturing a wind turbine blade, and includes: providing a plurality of pultruded strips; stacking a plurality of pultrusion strips into a main beam preform; fixing at least one pair of limiting devices with the blade mould; placing the girder preform between each pair of the limiting devices; laying a core material on a blade mould; pouring and curing to form a shell; and separating the shell from the blade mould to obtain the blade shell.

In an embodiment of the present application, a plurality of pultruded strips is provided, comprising: and chamfering at least one pultrusion strip on at least one side of the pultrusion strip in the width direction of the pultrusion strip along the length direction of the pultrusion strip.

In an embodiment of the present application, stacking a plurality of pultruded strips into a spar preform, comprises: laying a plurality of pultrusion strips on a main beam operating platform; and stacking a plurality of pultrusion strips positioned on the main beam operating platform, and fixing the pultrusion strips through a fixing device.

In an embodiment of the present application, placing a girder preform between each pair of stop devices comprises: after placing the girder preforms between each pair of the stoppers, the fixing devices are detached from the girder preforms.

In an embodiment of the present application, stacking a plurality of pultruded strips into a spar preform, comprises: laying a plurality of pultrusion strips in a blade mould; a plurality of pultruded strips located in a blade mould are stacked.

In an embodiment of the present application, fixing at least one pair of position limiting devices with a blade mold includes: setting a target area for placing a girder preformed piece on a blade mould; arranging limiting devices at the outer edges of two sides of the target area along the width direction of the target area; the difference between the distance between each pair of limiting devices and the width of the main beam is less than or equal to the limiting error.

In the embodiment of this application, with at least one pair of stop device and blade mould fixed, still include: and fixedly connecting the limiting device with the blade mould.

In an embodiment of the application, detaching the shell from the blade mold comprises: the limiting device falls off together with the blade mould and the shell; repairing the concave part of the shell corresponding to the limiting device.

In the embodiment of this application, with at least one pair of stop device and blade mould fixed, still include: arranging a surface protection layer in the blade mould; and fixedly connecting the limiting device with the surface protective layer.

In an embodiment of the application, detaching the shell from the blade mold comprises: separating the limiting device from the blade mould along with the shell; and the limiting device is fixedly connected with the shell, and the surface of the shell is treated.

In an embodiment of the application, laying down a core at a blade mould comprises: when the core material is laid in the blade mould, the core material is not overlapped with the limiting device; a fiber fabric is laid on the core material.

In a second aspect, embodiments of the present application further provide a blade, where a shell of the blade is prepared by the blade shell preparation method of the first aspect.

According to the blade shell preparation method provided by the embodiment of the application, the limiting device is arranged in the blade die, and when the main beam preformed piece is placed behind the blade die and the fixing device is detached, the pultrusion strip is prevented from being displaced or deformed through the limiting device, so that the main beam preformed piece can keep an expected shape, the introduction of foreign matters such as a strapping rope and the like to influence the structural strength of the blade is avoided, and the strength of the main beam is improved.

Drawings

Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.

FIG. 1 is a schematic view of a spar preform being placed in a blade mold;

FIG. 2 is a flow chart of one embodiment of the present application;

FIG. 3 is a top view of a pultruded strip chamfer of one embodiment of the present application;

FIG. 4 is a top view of a pultruded strip chamfer cut according to another embodiment of the present application;

FIG. 5 is a top view of a pultruded strip chamfer cut according to yet another embodiment of the present application;

FIG. 6 is a schematic illustration of a pultruded strip according to an embodiment of the present application in multiple layers;

FIG. 7 is a cross-sectional view of section A-A of FIG. 6;

FIG. 8 is a schematic view of a stacked pultruded strip secured by a securing device according to one embodiment of the present application;

FIG. 9 is a schematic view of a bundling tool used in another embodiment of the present application;

FIG. 10 is a top view of a retainer device and blade mold according to one embodiment of the present application;

FIG. 11 is a schematic view of a spar preform being placed in a blade mold in one embodiment of the present application;

fig. 12 is a schematic view of the fixing device in fig. 11 after being disassembled.

In the drawings:

1, a main beam preform; 11, pultrusion of the strip; 12, an interlaminar fabric;

2, a main beam operating platform;

3, a blade mould;

4, a fixing device; 41, conformal foam; 42, strapping tape; 43, bundling a tool; 431, random blocks; 432, horizontal bar; 433, adjusting a worm; 434, a sling; 435, locking and buckling; 436, lifting lugs; 437, a limiting block;

5, a limiting device;

a, a target area.

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The embodiments will be described in detail below with reference to the accompanying drawings.

Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.

In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that in the embodiment of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

The shell of the wind power blade comprises a main beam, a fiber material layer, a core material and the like. The general idea of manufacturing the main beam by adopting a pultrusion process is to splice a plurality of pultrusion strips in the width direction of the main beam and form a preformed piece in a mode that a plurality of layers of pultrusion strips are stacked in the thickness direction of the main beam. In the blade mold, a shell is formed by pouring and curing components such as a preformed main beam, a fiber material layer and a core material together, so as to conform to the shape of the blade mold.

Fig. 1 is a schematic view of a spar preform 1 placed in a blade mold 3.

When the wind power blade is prepared, the main beam of the wind power blade can be mainly manufactured by adopting a pultrusion strip, the pultrusion strip is a composite material part which is usually manufactured by fibers and resin through a pultrusion process, and the composite material part can be a long strip-shaped plate, a rod-shaped part or a variable cross-section strip-shaped part and the like. The pultrusion may form a preform of the spar on the spar operating platform, spar mold, or blade mold 3.

Specifically, when the main beam operation platform or the main beam mold is formed, the plurality of pultrusion strips 11 are arranged on the main beam operation platform or the main beam mold in parallel according to the width of the main beam and are stacked layer by layer to be in the shape of the main beam, or the pultrusion strips 11 are stacked according to the thickness of the main beam and are stacked one by one and arranged in the shape of the main beam. The stack of pultruded strips 11 is then secured to the girder preform 1 by a securing means 4, which securing means 4 may illustratively comprise a conformal foam 41 and a strapping 42. The girder preform 1 is then moved into the blade mould 3, during which the pultruded strips 11 are fixed using fixing means, see fig. 1, in order to ensure that the shape of the girder preform 1 remains unchanged. Then the girder preform 1 is co-poured and cured with other shell parts to a shell, and finally the shell is repaired.

When the blade mold 3 is formed, firstly, a fiber material layer is laid on the blade mold 3, then a plurality of pultrusion strips 11 are arranged on the fiber material layer in the main beam area in parallel according to the width of the main beam and are stacked layer by layer to be in the shape of the main beam, or the pultrusion strips 11 are stacked according to the thickness of the main beam and are stacked one by one and arranged in the shape of the main beam. The stack of pultruded strips 11 is then fixed into a preform by means of a fixing device 4, which fixing device 4 may, for example, comprise a form-following foam 41 and a strapping 42. The preform 1 is then co-injected with other housing parts and cured to form a housing, which is finally repaired.

In pouring the solidification process, in order to avoid appearing the gap between the crowded strip 11 of drawing, need keep fixing device 4 fixed to crowded strip 11 of drawing, consequently, pouring and solidify into the casing after, fixing device can leave over in the wind-powered electricity generation blade, can reduce the bulk strength of girder. If the fixing means 4 is removed, gaps may be created between the pultruded strips 11 due to the curved surface of the blade mould 3, affecting the structural strength of the shell.

In view of the above problems, the embodiment of the present application provides a method for preparing a blade shell, in which a limiting device is disposed in a blade mold 3, and after a main beam preform 1 is placed in the blade mold 3, displacement or deformation of pultrusion strips 11 is prevented by the limiting device, so that gaps can be prevented from being generated between the pultrusion strips 11, the main beam preform 1 can maintain an expected shape, when pouring and curing are performed, a main beam does not need to be fixed by a fixing device 4, foreign matters such as a strapping tape 42 are prevented from being introduced, and a main beam area of the shell is ensured to have higher structural strength.

FIG. 2 is a flow chart of an embodiment of the present application, and with reference to FIG. 2, an embodiment of the present application provides a method of manufacturing a blade shell, comprising the steps of:

step S1, providing a plurality of pultruded strips 11;

step S2, stacking a plurality of pultruded strips 11 into a girder preform 1;

step S3, fixing at least one pair of position limiting devices to the blade mold 3;

step S4, placing the girder preforms 1 between each pair of stoppers 5;

step S5, laying a core material on the blade mold 3;

step S6, pouring and curing to form a shell;

in step S7, the shell is separated from the blade mold 3 to obtain the blade shell.

In step S3 of the embodiment of the present application, at least one pair of position-limiting devices is disposed in the blade mold 3, and then in step S4, the main beam preform 1 after being fixed is placed between each pair of position-limiting devices, and then the fixing device 4 can be removed, at this time, the position-limiting devices can prevent a significant gap from occurring between the pultrusion strips 11 of the main beam preform 1, so that after step S6 is performed, no foreign matter is left in the shell of the blade, and finally, the shell of the blade can have high structural strength.

Referring to fig. 2, step S1 of the blade shell manufacturing method of the embodiment of the present application includes:

in step S1, at least one pultruded strip 11 is subjected to a width chamfer cutting process on at least one side of the pultruded strip 11 in the width direction of the pultruded strip 11 along the length direction of the pultruded strip 11. When the girder preform 1 formed by the plurality of pultruded strips 11 is placed in the blade mold 3, the ends of the pultruded strips 11 located at the blade tip or blade root area may be gathered due to the shape of the blade, thereby causing overlapping or misalignment between the adjacent pultruded strips 11. In the embodiment of the application, when the pultruded strips 11 are manufactured or post-processed, the end parts of the pultruded strips 11 close to the blade tips or the blade roots are subjected to chamfer cutting, even if the end parts of the pultruded strips 11 are folded, overlapping or dislocation in the width direction among the pultruded strips 11 can not be generated, and if gaps among the pultruded strips 11 are too large, gaps can be filled in a yarn form. Exemplarily, chamfering is carried out on the end part of 1-3 layers of pultrusion strips 11 in the direction from the blade root to the blade tip at the blade root of the pressure surface of the wind power blade; chamfering the end parts of 1-3 layers of pultrusion strips 11 in the direction from the blade root to the blade tip at the blade root of the suction surface of the wind power blade; and chamfering the end parts of 1-2 layers of the pultrusion strips 11 in the direction from the blade tip to the blade root at the blade tip of the suction surface of the wind power blade. Through the chamfer to the pultrusion strips 11, the structural consistency of the girder preform 1 formed by the pultrusion strips 11 can be ensured, and the structural strength reduction of the girder caused by the overlapping or dislocation of the pultrusion strips 11 is avoided.

Illustratively, fig. 3 is a top view of a chamfered corner of the pultruded strip 11 according to one embodiment of the present application, fig. 4 is a top view of a chamfered corner of the pultruded strip 11 according to another embodiment of the present application, and fig. 5 is a top view of a chamfered corner of the pultruded strip 11 according to yet another embodiment of the present application. Referring to fig. 3 to 5, in the plurality of pultruded strips 11, a portion of the pultruded strips 11 may be subjected to single-side chamfer cutting, a portion of the pultruded strips 11 may be subjected to double-side chamfer cutting, or the remaining portion of the pultruded strips 11 may not be subjected to cutting based on the chamfer cutting of the portion of the pultruded strips 11.

FIG. 6 is a schematic illustration of a pultruded strip 11 according to one embodiment of the present application in multiple layers. Before chamfering, length parameters of the pultruded strips 11 are determined, the pultruded strips 11 with corresponding lengths are obtained by cutting, and referring to fig. 6, the pultruded strips 11 are laminated and fixed to form the girder preform 1.

When chamfering is carried out, the pultrusion strips 11 are firstly compressed and fixed, so that the pultrusion strips 11 can be kept stable when the chamfering is cut, and vibration is avoided; the end of the pultrusion strip 11 is chamfered and cut in a cutting mode, the cutting process is carried out along the extending direction of the pultrusion strip 11 from the region where the pultrusion strip 11 is not chamfered to the direction of the end of the pultrusion strip 11, and therefore the width of the chamfered part of the pultrusion strip 11 can be continuously changed. Illustratively, in one embodiment of the present application, the pultruded strip 11 has a length of 1500mm, a width of 50mm, a chamfer length of 500mm, and a width of 25mm at the end of the pultruded strip 11 after chamfering. After the chamfering is completed by cutting, the area to be cut in the pultruded strip 11 is also ground. The edges of the cut pultruded strips 11 are ground in the thickness direction of the pultruded strips 11.

Referring to fig. 2, step S2 of the blade shell manufacturing method of the embodiment of the present application includes:

in step S2, a plurality of pultruded strips 11 are laid on a girder operation platform or a girder mold and stacked, and at this time, the plurality of pultruded strips 11 are formed in the same shape as the flat-expanded shape of the girder preform 1. Since the main beam preform 1 needs to be moved from the main beam operation platform to the blade mold 3, and therefore, the main beam preform 1 needs to be fixed, in the embodiment of the present invention, the main beam preform 1 is fixed by the fixing device 4, so that the shape of the fixed main beam preform 1 is the same as the shape of the main beam position in the blade mold 3, and the shape of the main beam preform 1 can be kept unchanged when the main beam preform 1 is moved.

In another embodiment of the present application, a plurality of pultruded strips 11 are laid in the blade mould 3 and stacked, wherein the plurality of pultruded strips 11 form a curved surface. At this time, since the pultruded strips 11 are in a free state, gaps may occur between the pultruded strips 11, and the main beam preform 1 needs to be fixed, so that the curved surface shape formed by the plurality of pultruded strips 11 is consistent with the expected curved surface shape of the main beam preform 1. In the embodiment of the present application, the plurality of pultruded strips 11 are fixed by the fixing device 4, and the main beam preform 1 is formed such that the shape of the fixed main beam preform 1 is the same as the intended shape of the main beam.

Fig. 7 is a sectional view of section a-a in fig. 6.

Referring to fig. 7, in the process of stacking a plurality of pultruded strips 11, the plurality of pultruded strips 11 may be stacked in a multi-layer structure, each layer being laid by a plurality of pultruded strips 11. An interlayer fabric 12 is laid between two adjacent layers of pultruded strips 11 of the multilayer structure. The pultruded strips 11 and the interlaminar fabric 12 alternate in the thickness direction of the girder preform 1. In the subsequent pouring and curing process, the interlayer fabric 12 can guide the adhesive used in the pouring process, so that the adhesive can uniformly flow into the space between the pultrusion strips 11, and the structural strength of the main beam is improved.

It is understood that a single layer of interlay er fabric 12 may be disposed between two adjacent layers of pultruded strips 11, thus having strong tensile strength; it is also possible to provide multiple layers of interlay er fabric 12 between two adjacent layers of pultruded strips 11, which provides greater bending strength. And is selected according to specific requirements without limitation.

Optionally, in an embodiment of the present application, the interlayer fabric 12 includes glass fiber yarns, and the linear density of the glass fiber yarns is 100tex to 600tex, such as 100tex, 150tex, 200tex, 250tex, 300tex, 400tex, 500tex or 600 tex. That is to say, the linear density of the interlayer fabric 12 is low, the space occupied by the interlayer fabric 12 is small, and the increase of the gap between the interlayer fabric 12 and the pultrusion strip 11 is facilitated, so that the flowing space of the adhesive is increased, the flowing resistance of the adhesive is reduced, the flowing speed and the flowing uniformity of the adhesive are improved, the risk of bubbles generated between the interlayer fabric 12 and the pultrusion strip 11 is effectively reduced, and the structural strength and the structural stability of the main beam are improved.

It should be noted that "tex" in the description of the present application refers to units of linear density, meaning grams of weight per 1000 meters of yarn at a given moisture regain.

The areal density of the interlayer fabric 12 is not limited, and, for example, the areal density of the interlayer fabric 12 may be set to less than 600gsm (grams per square meter), or less than 300 gsm. The density of the surface of the interlayer fabric 12 is small, so that the volume of the interlayer fabric 12 can be reduced, and the flow guiding uniformity of the interlayer fabric 12 can be improved.

Alternatively, in another embodiment of the present application, the interlaminar fabric 12 includes fiber yarns, the fiber yarns are arranged along two intersecting directions, and the fiber yarns in the two directions may be perpendicular or may intersect at an acute angle, such as an included angle of 45 ° or 60 °, without limitation. The fiber yarns are arranged along two crossed directions, and the adhesive flowing through the interlayer fabric 12 can flow along two directions along with the trend of the fiber yarns, so that the flow guide uniformity of the interlayer fabric 12 is improved, and the structural strength and the structural stability of the main beam are further improved.

The layering of the two directional fiber yarns is not limited, and in some embodiments, the two directional fiber yarns are layered separately, i.e., the two directional fiber yarns are layered unidirectionally, such as in a biaxial fabric. In other embodiments, the two directions of fiber yarns are interwoven as a layer, such as a plain weave.

It is understood that the types of the fiber yarns in the two directions may be the same or different, and the linear densities of the fiber yarns in the two directions may be the same or different, which is not limited herein.

Optionally, in another embodiment of the present application, the fiber yarns in one direction are carbon fiber yarns, the fiber yarns in the other direction are glass fiber yarns, the carbon fiber yarns are arranged along the extending direction of the pultruded strip 11, and the glass fiber yarns are arranged along the width direction of the pultruded strip 11. The arrangement is favorable for improving the flow guiding speed of the interlayer fabric 12 in the width direction, and the finally obtained main beam is applied to the wind power blade, so that the wind power blade has a certain lightning protection effect.

It is understood that the fiber yarn may be a non-twisted yarn or a twisted yarn, and when the fiber yarn is a non-twisted yarn, the flow guiding speed of the inter-layer fabric 12 is further improved.

Illustratively, fig. 8 is a schematic view of a stacked pultruded strip 11 secured by a securing device 44 according to an embodiment of the present application. Referring to fig. 8, the stacked pultruded strips 11 are placed on the girder operating platform 2, the fixing device 44 may include a conformal foam 41 and a strapping tape 42, the conformal foam 41 has a shape corresponding to the shape of the inner side of the girder preform 1 and is disposed on the stacked pultruded strips 11, and the strapping tape 42 passes through between the pultruded strips 11 and the girder operating platform 2 and binds and fixes the conformal foam 41 and the pultruded strips 11.

Illustratively, the fixture 44 may also include a bundle fixture. Fig. 9 is a schematic view of a bundling tool 43 according to another embodiment of the present application. Referring to fig. 9, the bundling tool 43 includes a following block 431, a cross bar 432, an adjusting worm 433, a hanging strip 434, a lock 435 and a lifting lug 436, wherein the following block 431 has a shape consistent with the inner side shape of the girder preform 1, one end of the adjusting worm 433 is opposite to the side of the following block 431 away from the girder preform 1, the adjusting worm 433 penetrates through the cross bar 432, a limit block 437 is disposed on the adjusting worm 433, the limit block 437 is in threaded connection with the adjusting worm 433 and is used for limiting the movement of the cross bar 432 along the extending direction of the adjusting screw, one end of the hanging strip 434 is fixedly connected with one end of the cross bar 432, the other end of the hanging strip 434 is detachably connected with the lock 435 disposed at the other end of the cross bar 432, and the lifting. When the bundling tool 43 is used, the following block 431 is attached to the inner side of the main beam preformed piece 1, the hanging strip 434 penetrates through the main beam preformed piece 1 and the main beam operating platform 2, the hanging strip 434 is connected with the lock 435, and the limit block 437 is adjusted, so that the following block 431 is attached to the inner side of the main beam preformed piece 1, and the bundling tool 43 and the main beam preformed piece 1 are fixed. When moving the girder preform 1, the girder preform 1 may be lifted and moved by the lifting lug 436.

Referring to fig. 2, step S3 of the blade shell manufacturing method of the embodiment of the present application includes:

in step S3, fig. 10 is a top view of the position limiting device 5 and the blade mold 3 according to an embodiment of the present application. Referring to fig. 10, a plurality of layers of fiber fabric are first laid on the blade mold 3, and then a target area a where the girder preform 1 is placed is set, and in the subsequent step the girder preform 1 is placed within the target area a. Since the chamfering process is performed on the pultrusion strips 11 in step S1, it is desirable that the limiting device 5 can stably limit the main beam preform 1, so as to prevent a significant gap from occurring between the pultrusion strips at the end of the main beam preform, and the minimum distance between the limiting device 5 and the chamfering area of the pultrusion strips 11 is a stable distance (not shown in the figure). The stabilizing distance may be preset together when determining the parameters of the pultruded strip 11, and may be, for example, 300 and 500mm in one embodiment of the present application. The minimum distance between the limiting devices 5 and the chamfer area of the pultrusion strip 11 is a stable distance, so that the deformation of the main beam preformed piece 1 can be fully avoided, the difference value between the distance between each pair of limiting devices 5 and the width of the main beam preformed piece 1 is smaller than or equal to a limiting error (not shown in the figure), the limiting error is the maximum error between the distance between each pair of limiting devices 5 and the width of the main beam, the limiting error is a preset parameter, and the size of the limiting error can be determined together when the parameter of the wind power blade is determined. Exemplarily, the limiting device 5 may be a wedge-shaped block, one of the 2 right-angle surfaces is connected with the blade mold 3, and the other is used as a limiting surface.

The connection relationship between the blade mould 3 and the limiting device 5 has at least the following two connection modes:

connection mode one

The limiting device 5 is permanently fixedly connected with the blade mould 3, and then the multilayer fiber fabric is laid in the blade mould 3. Illustratively, a piece of release cloth is laid on the limiting device, and then a material such as an in-mold gel coat is laid on the blade mold 3.

Connection mode two

The inner gel coat is arranged in the blade mould 3, and then the limiting device 5 is fixed with the blade mould 3. Illustratively, firstly brushing an in-mold gel coat on the blade mold 3, then fixedly connecting the limiting device 5 with the in-mold gel coat, and finally paving a fiber fabric on the blade mold 3.

In the embodiment of the present application, step S2 and step S3 are not sequential, and may be performed simultaneously, or step S2 is performed first and step S3 is performed second, or step S3 is performed first and step S2 is performed second.

Referring to fig. 2, step S4 of the blade shell manufacturing method of the embodiment of the present application includes:

in step S4, fig. 11 is a schematic diagram of the placement of the spar preform 1 on the blade mold 3 according to one embodiment of the present application. Fig. 12 is a schematic view of the fixing device 44 in fig. 11 after being disassembled. Referring to fig. 11 and 12, the main beam preform 1 is placed in the target area a of the blade mold 3, i.e., the girder preform 1 is positioned between each pair of stoppers 5, the fixing means 44 is detached from the girder preform 1, since the difference between the distance between each pair of stop devices 5 and the width of the girder preform 1 is less than or equal to the stop error, even if the fixing device 44 is detached from the girder preform 1, the girder preform 1 can be restrained by the restraining device 5, the shape of the girder preform 1 is kept unchanged, and because the fixture 44 has been removed from the main beam preform 1, no new fixture is introduced that maintains the shape of the main beam preform 1, after the preparation of the blade shell is completed, no foreign matter is left in the blade shell, and the blade shell can be guaranteed to have good structural strength.

Referring to fig. 2, step S5 of the blade shell manufacturing method of the embodiment of the present application includes:

in step S5, the core material is a main structure for preparing the blade shell together with the main beam, and when the core material is laid in the blade mold 3, the core material is not overlapped with the limiting device 5, that is, the core material is repaired, so that the core material can not only avoid the limiting device 5 but also be fully laid at a corresponding position in the blade mold 3 when the core material is laid. And after the core material is laid, laying a limiting fabric on the core material.

Referring to fig. 2, step S6 of the blade shell manufacturing method of the embodiment of the present application includes:

before the pouring, fiber fabrics and auxiliary materials such as porous membranes, flow guide nets and vacuum membranes are laid on the core material and main beam pre-forming pieces 1, and then pouring and curing are carried out to form the blade shell.

Referring to fig. 2, step S7 of the blade shell manufacturing method of the embodiment of the present application includes:

when the blade shell is separated from the blade mold 3, different separation methods are adopted according to different connection methods between the limiting device 5 and the blade mold 3 in the step S3:

disengagement mode one

When the connection mode is adopted between the limiting device 5 and the blade mold 3 in the step S3, because the limiting device 5 is directly and fixedly connected with the blade mold 3, the limiting device 5 is separated from the blade shell along with the blade mold 3, and at this time, a recess corresponding to the limiting device 5 is left at a position on the blade shell corresponding to the limiting device 5, and the recess is repaired, so that the blade shell has a complete surface.

Separation type two

When the second connection mode is adopted between the limiting device 5 and the blade mold 3 in the step S3, since the limiting device 5 is connected with the in-mold gel coat, the limiting device 5 is separated from the blade mold 3 along with the blade shell with the gel coat, and at this time, the limiting device 5 is kept in the blade shell. If the stop means 5 is slightly convex with respect to the blade shell surface, the convex part of the stop means 5 with respect to the blade shell surface is ground and the surface of the blade shell is repaired.

Illustratively, the position limiting device 5 may be made of glass fiber reinforced plastic, balsa wood, or Polyethylene terephthalate (PET). It should be noted that, if the first connection mode is adopted between the limiting device 5 and the blade mold 3 in step S3, the shape of the limiting device 5 is similar to a frustum structure or a cone structure, and the bottom surface of the structure is connected with the blade mold 3, so that the limiting device 5 can be smoothly separated from the blade shell, and the recessed structure on the blade shell can be conveniently repaired; if the second connection method is adopted between the limiting device 5 and the blade mould 3 in step S3, the limiting device 5 should be at least partially the same as the material or structure of the blade shell and the core material.

The embodiment of the application also provides a blade, and the shell of the blade is prepared by the preparation method of the blade shell of the embodiment. The surface of the blade shell comprises a repair area, the position of which corresponds to the position of the limiting device 5.

In summary, in the blade shell manufacturing method provided by the embodiment of the present application, the limiting device 5 is disposed in the blade mold 3, and when the fixing device 44 is detached after the main beam preform 1 is placed in the blade mold 3, the pultrusion strip 11 is prevented from being displaced or deformed by the limiting device 5, so that the main beam preform 1 can maintain an expected shape, and introduction of foreign matters such as a strapping rope and the like to affect the structural strength of the blade is avoided.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A preparation method of a wind power blade shell is characterized by comprising the following steps:

providing a plurality of pultruded strips;

stacking a plurality of pultrusion strips into a main beam preform;

fixing at least one pair of limiting devices with the blade mould;

laying a plurality of layers of fiber fabrics in a blade mould;

placing the girder preform on a plurality of layers of fiber fabric and between each pair of the stoppers;

laying down a core material on the blade mould;

pouring and curing to form a shell;

and separating the shell from the blade mould to obtain the blade shell.

2. The method of making a blade shell of claim 1, wherein said providing a plurality of pultruded strips comprises:

and along the length direction of the pultrusion strips, chamfering at least one pultrusion strip along at least one side of the width direction of the pultrusion strips.

3. The method of preparing a blade shell according to claim 1 or 2, wherein said stacking a plurality of pultruded strips into a spar preform comprises:

laying a plurality of the pultrusion strips on a main beam operation platform; stacking a plurality of pultrusion strips positioned on the main beam operating platform layer by layer, and paving a flow guide material among the pultrusion strips; and fixing the stacked pultrusion strips through a fixing device.

4. A blade shell preparation method according to claim 3, wherein said placing said main beam preform between each pair of said stop means comprises:

detaching the fixture from the main beam preform after placing the main beam preform between each pair of the stoppers.

5. The method of preparing a blade shell according to claim 1 or 2, wherein said stacking a plurality of pultruded strips into a spar preform comprises:

laying a plurality of the pultrusion strips in a blade mould; and stacking a plurality of pultrusion strips positioned in the blade mould layer by layer, and paving a flow guide material between the pultrusion strips.

6. The method of manufacturing a blade shell according to claim 1, wherein said securing at least one pair of limiting means to the blade mould comprises:

providing a target area on the blade mold for placement of the spar preform;

arranging the limiting devices on the outer edges of two sides of the target area along the width direction of the target area; the difference between the distance between each pair of limiting devices and the width of the main beam is smaller than or equal to a limiting error.

7. The method of manufacturing a blade shell according to claim 6, wherein said securing at least one pair of limiting means to the blade mold further comprises:

and fixedly connecting the limiting device with the blade mould.

8. The method of manufacturing a blade shell according to claim 7, wherein said detaching the shell from the blade mould comprises:

dropping the limiting device together with the blade mould and the shell; and repairing the concave part corresponding to the limiting device on the shell.

9. The method of manufacturing a blade shell according to claim 6, wherein said securing at least one pair of limiting means to the blade mold further comprises:

arranging a surface protection layer in the blade mould; and fixedly connecting the limiting device with the surface protection layer.

10. The method of manufacturing a blade shell according to claim 9, wherein said detaching the shell from the blade mould comprises:

separating the limiting device together with the shell from the blade mould;

the limiting device is fixedly connected with the shell, and the surface of the shell is processed.

11. The method for preparing a blade shell according to claim 1, wherein the laying down of a core material on the blade mold comprises:

the core material is not overlapped with the limiting device when the core material is laid in the blade mould;

and laying a fiber fabric on the core material.

12. A blade, characterized in that the shell of the blade is manufactured by the method of manufacturing a blade shell according to any of claims 1 to 11.