A wind turbine blade leading edge integrated prefabricated component and preparation method thereof

Abstract

The present invention discloses an integrated prefabricated component for the leading edge of a wind turbine blade and a preparation method thereof, wherein the integrated prefabricated component for the leading edge of the blade comprises an integrated prefabricated pressure surface front edge UD main body section, a leading edge connecting plate main body section and a flanged flange section, wherein the flanged flange effectively prevents the leading edge prefabricated component from sliding downward due to gravity, thereby ensuring the structural accuracy of the blade production. Furthermore, the use of the integrated prefabricated component for the leading edge of the blade reduces the number of times of glue spraying during the production process of the wind turbine blade, thereby ensuring the stability of the structural performance of the leading edge of the wind turbine blade; the integrated prefabricated component for the leading edge of the blade can also reduce the step wrinkles at the splicing position of the leading edge connecting plate mold, thereby ensuring the gap between the leading edge connecting plate and the suction surface shell; in addition, during the production process of the wind turbine blade, the integrated prefabricated component for the leading edge of the blade can also reduce the number of layers of fiber cloth laid by workers, thereby improving the efficiency of shell laying and shortening the production cycle of the blade.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine blade manufacturing, and relates to an integrated prefabricated component of a wind turbine blade leading edge and a preparation method thereof, in particular to an integrated prefabricated component of a wind turbine blade leading edge connecting plate with a flanging flange and a leading edge UD part and a preparation method thereof. Background Art

[0002] For large wind turbine blades, cracks and delamination defects at the leading edge of the blades will affect the safe operation of the blades, so the production quality of the leading edge of the blades is also very important. The leading edge of existing large wind turbine blades is usually provided with a leading edge UD piece and a leading edge connecting plate, and the longer the wind turbine blade is, the thicker the leading edge UD piece and the leading edge connecting plate are, and the more layers of glass fiber reinforced cloth are laid.

[0003] In the production process of wind turbine blades, the leading edge UD parts are generally made by laying glass fiber reinforced cloth in staggered layers in the span and chord directions on the designed positioning. Due to the large curvature of the leading edge area of ​​the blade, the leading edge UD is currently fixed by spraying glue or sewing several layers of fiber reinforced cloth together to prevent the cloth layer from sliding down and falling off under the action of gravity. The leading edge connecting plate is usually made by laying it together with the blade pressure surface shell, and the leading edge area of ​​the blade suction surface shell is bonded together by the leading edge connecting plate and the leading edge of the pressure surface shell. When laying the blade pressure surface shell, the glass fiber reinforced cloth of the connecting plate is laid in staggered layers in the span and chord directions on the preparation mold of the pressure surface shell and the leading edge connecting plate. The preparation mold of the leading edge connecting plate is composed of segmented molds, and then the resin is poured together with the blade pressure surface shell to complete the integrated curing molding process of the leading edge connecting plate and the pressure surface shell.

[0004] The above-mentioned existing wind turbine blade leading edge UD parts, leading edge connecting plate structures and their processing and preparation methods are inefficient and take a long time to process. The laid fiber cloth layers are prone to slide downward in the chord direction under the action of gravity, which can easily lead to deviations in the chord-wise laying positions of the fiber cloth layers. It is also easy to cause an inappropriate gap between the leading edge connecting plate and the leading edge area of ​​the blade suction surface shell, which can easily cause the produced blades to have step wrinkle defects in the leading edge area. The unstable production quality of the leading edge area of ​​the blades will directly lead to an increase in the risk and cost of blade maintenance. Summary of the invention

[0005] 1. Technical issues

[0006] In view of the above-mentioned defects and shortcomings of the prior art, the present invention aims to provide an integrated prefabricated component of the leading edge of a wind turbine blade and a preparation method thereof, by prefabricating the existing independently prepared blade pressure surface front edge UD part and the leading edge connecting plate into an integral form, and by arranging a flanging flange structure on the integrated prefabricated component, it can effectively ensure that the pressure surface front edge UD does not have any cloth layer slippage, ensure that the positioning shape of the pressure surface front edge UD is in fit with the shell, ensure the conformability of the leading edge connecting plate, and ensure that the gap between the leading edge connecting plate and the blade shell is reasonable, thereby reducing the frequency of wrinkle and whitening defects in the leading edge area of ​​the blade, and can improve the laying work efficiency, shorten the blade production cycle, and reduce the blade maintenance risk and maintenance cost.

[0007] (II) Technical solution

[0008] In order to solve the technical problem, the technical solution adopted by the present invention is as follows:

[0009] A prefabricated integral component of a leading edge of a wind turbine blade comprises a pressure surface front edge UD main body section, a leading edge connecting plate main body section and a flanging flange section, wherein the pressure surface front edge UD main body section, the leading edge connecting plate main body section and the flanging flange section are prefabricated integrally, wherein:

[0010] The main section of the front edge of the pressure surface UD is in the shape of a curved plate as a whole, and its outer surface shape is adapted to the inner surface shape of the leading edge part of the pressure surface shell of the wind turbine blade, and the leading edge of the main section of the front edge of the pressure surface UD does not exceed the leading edge line of the blade shell in the chord width direction and is basically flush with the leading edge line of the blade shell;

[0011] The main body section of the leading edge connecting plate is in the shape of a curved plate as a whole, which is substantially symmetrical about the leading edge line of the blade shell in the chord-wise width direction, and includes a pressure surface connecting plate portion located on one side of the leading edge line of the blade shell and a suction surface connecting plate portion located on the other side of the leading edge line of the blade shell in the chord-wise width direction, the pressure surface connecting plate portion is arranged on the inner side of the main body section of the pressure surface UD in the thickness direction, and the shape of the outer surface of the suction surface connecting plate portion is adapted to the shape of the inner surface of the leading edge portion of the suction surface shell of the wind turbine blade;

[0012] The flanged flange section is in the shape of a straight plate as a whole, and is substantially perpendicular to the leading edge line of the blade shell in the chord-wise width direction. In the chord-wise cross section, the angle between the flanged flange section and the main section of the front edge UD of the pressure surface is not less than 90 degrees.

[0013] Preferably, the pressure surface front edge UD main section, the front edge connecting plate main section and the flanging flange section are integrally formed, and all include multiple layers of glass fiber reinforced cloth sequentially laid from outside to inside and cured into one by resin, wherein:

[0014] The outermost glass fiber reinforced cloth forms the outer surface layer of the pressure surface front edge UD main section and the flanged flange section, and the portion thereof that does not exceed the leading edge line of the blade shell in the chord-wise width direction forms the outer surface layer of the pressure surface front edge UD main section, and the portion thereof that exceeds the leading edge line of the blade shell in the chord-wise width direction forms the outer surface layer of the flanged flange section;

[0015] In the glass fiber reinforced cloth layers of the UD main section at the front edge of the pressure surface, the chord-wise widths of the cloth layers are the same, and the layers are stacked and staggered in the thickness direction. The closer the cloth layer is to the outside, the longer its span-wise length is, and the closer it is to the leading edge line of the blade shell in the chord-wise width direction.

[0016] In the glass fiber reinforced cloth plies of the main section of the leading edge connection plate, the chord-wise widths of the cloth layers are the same, and the layers are stacked and staggered in the thickness direction. The closer the cloth layer is to the outside, the longer its span-wise length is, and the wider the area covering the main section of the front edge UD of the pressure surface is in the chord-wise width direction. The area covering the main section of the front edge UD of the pressure surface forms the plies of the pressure surface connection plate portion, and the remaining area forms the plies of the suction surface connection plate portion.

[0017] In the glass fiber reinforced cloth ply of the flange section, one or more layers of long glass fiber reinforced cloth are sequentially laid along the span direction on the surface of the portion of the outermost glass fiber reinforced cloth that exceeds the leading edge line of the blade shell in the chord-wise width direction.

[0018] Preferably, the glass fiber reinforced cloth materials used in the pressure surface front edge UD main section and the leading edge connecting plate main section are different, and the thickness and span length of the pressure surface front edge UD main section and the leading edge connecting plate main section are also different.

[0019] Preferably, the outer surface of the suction surface connecting plate portion is curved, and in terms of structural dimensions, there is a uniform gap between the outer surface and the inner surface of the leading edge portion of the suction surface shell of the wind turbine blade, and the uniform gap is used to fill the structural adhesive.

[0020] The second object of the present invention is to provide a method for preparing the above-mentioned wind turbine blade leading edge integrated prefabricated component, the preparation method comprising at least the following steps:

[0021] SS1. Mold preparation:

[0022] The preform mold is fixedly set on the bracket in a suspended manner, the inner cavity surface of the preform mold is adapted to the outer surface shape and size of the pressure surface front edge UD main section and the suction surface connecting plate part of the leading edge connecting plate main section, and a long strip slit extending along the span direction is set on the inner cavity surface of the preform mold, the chord position of the long strip slit is consistent with the leading edge line of the blade shell, and two silicone blocks are set below the preform mold, which are located on the left and right sides of the long strip slit in the chord width direction and can be moved left and right to adjust, and the gap between the two silicone blocks forms a mold cavity of the flanging flange section, and the flanging flange sections of different thicknesses are formed by adjusting the gap between the two silicone blocks;

[0023] SS2. Layer preparation:

[0024] First, the inner cavity surface of the preform mold is cleaned, and then a demoulding cloth is laid on the inner cavity surface;

[0025] Secondly, the outermost glass fiber reinforced cloth is laid, the main part of which is laid on the inner cavity surface of the preform mold, and the part of which exceeds the leading edge line of the blade shell in the chord width direction extends out of the preform mold through the long strip slit and extends into the gap between the two silicone blocks, and one or more layers of long strip glass fiber reinforced cloth are arranged along the span direction on the glass fiber reinforced cloth extending into the gap;

[0026] Afterwards, several layers of UD glass fiber reinforced cloth at the front edge of the pressure surface are sequentially laid on the outermost glass fiber reinforced cloth on the inner cavity surface of the preform mold in staggered layers in the chord direction and the span direction. The closer the cloth layer is to the outside, the longer its span length is, and the closer it is to the leading edge line of the blade shell in the chord width direction.

[0027] Then, several layers of leading edge connecting plate glass fiber reinforced cloth are sequentially laid on the inner cavity surface of the preform mold in staggered layers in the chord direction and the span direction. The closer the cloth layer is to the outside, the longer its span length is, and the wider the area covering the main section of the front edge UD of the pressure surface in the chord width direction is. The area covering the main section of the front edge UD of the pressure surface forms the ply of the pressure surface connecting plate part, and the remaining area forms the ply of the suction surface connecting plate part.

[0028] SS3. Curing and forming:

[0029] Auxiliary materials are laid on the inner cavity surface of the preform mold in sequence, and the auxiliary materials include at least a demoulding cloth, an isolation film, a dense mesh, an air bridge and a vacuum bag. Then, the resin is vacuum infused and cured. After the resin is completely cured, the auxiliary materials are removed, and the edge of the preform is polished according to the design and process requirements to obtain an integrated prefabricated component of the leading edge of the blade with a flanging flange.

[0030] Preferably, the chord-wise width of the inner cavity surface of the preform mold is greater than the chord-wise width of the pressure surface front edge UD main section and the front edge connecting plate main section after being integrated into one, in order to facilitate the subsequent laying of auxiliary materials and subsequent resin infusion.

[0031] The third invention object of the present invention is to provide a method for preparing a pressure surface shell of a wind turbine blade, the preparation method comprising at least the following steps:

[0032] SS1. Pre-preparing the leading edge integral prefabricated component according to the above method of the present invention;

[0033] SS2. Lamination and curing:

[0034] First, the outer skin, blade root reinforcement preform and blade root reinforcement layer under the bolt sleeve are laid on the blade pressure surface shell mold;

[0035] Then, the leading edge integrated prefabricated component is placed on the leading edge position of the blade pressure surface shell mold in a hoisting manner, and its flanged flange section is placed on the edge top surface of the blade pressure surface shell mold, so that the flanged flange section supports and fixes the entire leading edge integrated prefabricated component, thereby preventing the leading edge integrated prefabricated component from sliding downward due to gravity;

[0036] Afterwards, for other areas on the blade pressure surface shell mold that are not covered by the leading edge integrated prefabricated component, continue to lay the glass fiber cloth, including laying the main beam and the trailing edge UD parts; for the upper part of the leading edge integrated prefabricated component on the blade pressure surface shell, lay the leading edge core material from the leading edge of the main beam to the area at a certain distance from the leading edge line, and then lay the subsequent materials including the trailing edge core material, the blade root reinforcement on the bolt sleeve, the inner skin, etc.;

[0037] Finally, the resin infusion and resin curing process is carried out;

[0038] SS3. After the resin on the blade pressure surface shell mold is cured, the flange section of the leading edge integrated prefabricated component is ground and cut off to form the blade pressure surface shell to avoid affecting the subsequent mold closing of the blade pressure surface shell and the suction surface shell.

[0039] Preferably, in the above step SS2, the leading edge core material and the leading edge integrated prefabricated component are overlapped above the leading edge integrated prefabricated component on the blade pressure surface shell mold, and the chord-wise chamfer of the leading edge core material is adapted to the chord-wise staggered layer of the glass fiber cloth layer of the prefabricated component.

[0040] (III) Technical Effect

[0041] Compared with the prior art, the integrated prefabricated component of the leading edge of a wind turbine blade of the present invention has significant technical effects: the integrated prefabricated component of the leading edge of a blade of the present invention is used in the production of wind turbine blades, and its flange flange has a good fixing and supporting effect on the prefabricated component, which can effectively prevent the leading edge prefabricated component of the blade from sliding down due to gravity, and then drive the glass fiber ply and other accessories around the leading edge prefabricated component to be misaligned, thereby ensuring the structural accuracy of the blade production. In addition, the use of the integrated prefabricated component of the leading edge of the blade reduces the number of times the wind turbine blade is sprayed with glue during the production process, ensuring the stability of the structural performance of the leading edge of the wind turbine blade; the integrated prefabricated component of the leading edge of the blade can also reduce the step wrinkles at the splicing position of the leading edge connecting plate mold, ensuring the gap between the leading edge connecting plate and the suction surface shell; in addition, during the production process of wind turbine blades, the integrated prefabricated component of the leading edge of the blade can also reduce the number of layers of fiber cloth ply, improve the efficiency of shell ply, and shorten the production cycle of blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of using the integrated prefabricated component of the leading edge of a wind turbine blade of the present invention when producing the blade pressure surface shell.

[0043] Figure 2 It is a schematic structural diagram of the integrated prefabricated component of the leading edge of a wind turbine blade of the present invention.

[0044] Figure 3 It is a schematic diagram of the preparation of the integrated prefabricated component of the leading edge of a wind turbine blade of the present invention.

[0045] Description of reference numerals:

[0046] 1-outer skin, 2-blade root reinforcement prefabricated part, 3-integrated prefabricated component of the leading edge of the wind turbine blade, 4-main beam, 5-flange section, 6-leading edge connecting plate main section, 7-pressure surface front edge UD main section, 8-prefabricated part mold, 9-silicone block. DETAILED DESCRIPTION

[0047] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the following is only a preferred embodiment of the present invention, but the content of the present invention is not limited to the following embodiments. In fact, various modifications and changes can be made in the present invention without departing from the scope or spirit of the present invention, which will be apparent to those skilled in the art. For example, the features shown or described as a part of an embodiment can be used together with another embodiment to produce another embodiment. Therefore, it is intended that the present invention includes such modifications and changes within the scope of the appended claims and their equivalents.

[0048] like Figure 2As shown, the integrated prefabricated component of the leading edge of a wind turbine blade of the present invention comprises a pressure face front edge UD main section 7, a leading edge connecting plate main section 6 and a flanging flange section 5. The pressure face front edge UD main section 7, the leading edge connecting plate main section 6 and the flanging flange section 5 are prefabricated and formed as a whole, wherein: the pressure face front edge UD main section 7 is in the shape of a curved plate as a whole, and its outer surface shape is adapted to the inner surface shape of the leading edge part of the pressure face shell of the wind turbine blade, and the leading edge of the pressure face front edge UD main section 7 does not exceed the leading edge line of the blade shell in the chord-wise width direction and is basically flush with the leading edge line of the blade shell; the leading edge connecting plate main section 6 is in the shape of a curved plate as a whole, and is basically symmetrical about the leading edge line of the blade shell in the chord-wise width direction, and includes a position in the chord-wise width direction. The pressure surface connecting plate portion on one side of the leading edge line of the blade shell and the suction surface connecting plate portion on the other side of the leading edge line of the blade shell, the pressure surface connecting plate portion is arranged on the inner side of the pressure surface front edge UD main section 7 in the thickness direction, and the shape of the outer surface of the suction surface connecting plate portion is adapted to the shape of the inner surface of the leading edge portion of the suction surface shell of the wind turbine blade; the flanged flange section 5 is generally in the shape of a straight plate, which is basically perpendicular to the leading edge line of the blade shell in the chord-wise width direction, and in the chord-wise cross section, the angle between the flanged flange section 5 and the pressure surface front edge UD main section is not less than 90 degrees.

[0049] The pressure face front edge UD main section 7, the leading edge connecting plate main section 6 and the flanging flange section 5 are integrally formed, and all include multiple layers of glass fiber reinforced cloth laid out in sequence from the outside to the inside and cured into one by resin, wherein the outermost glass fiber reinforced cloth forms the outer surface layer of the pressure face front edge UD main section and the flanging flange section, and the portion thereof that does not exceed the leading edge line of the blade shell in the chord-wise width direction forms the outer surface layer of the pressure face front edge UD main section, and the portion thereof that exceeds the leading edge line of the blade shell in the chord-wise width direction forms the outer surface layer of the flanging flange section; in the glass fiber reinforced cloth ply of the pressure face front edge UD main section 7, the chord-wise width of each cloth layer is the same, and they are stacked and staggered in the thickness direction, and the closer the cloth layer is to the outside, the wider its width is in the extension direction. The longer the length is, the closer it is to the leading edge line of the blade shell in the chord-wise width direction; in the glass fiber reinforced cloth ply of the leading edge connecting plate main section 6, the chord-wise width of each cloth layer is the same, and the layers are stacked and staggered in the thickness direction. The closer the cloth layer is to the outside, the longer its span-wise length is, and the wider the area covering the pressure surface front edge UD main section 7 in the chord-wise width direction is. The area covering the pressure surface front edge UD main section 7 forms the ply of the pressure surface connecting plate part, and the remaining area forms the ply of the suction surface connecting plate part; in the glass fiber reinforced cloth ply of the flange flange section 5, one or more layers of long strips of glass fiber reinforced cloth are laid in sequence along the span-wise direction on the surface of the outermost glass fiber reinforced cloth that exceeds the leading edge line of the blade shell in the chord-wise width direction.

[0050] In the integrated prefabricated component of the leading edge of the wind turbine blade of the present invention, the glass fiber reinforced cloth materials used in the pressure surface front edge UD main section 7 and the leading edge connecting plate main section 6 are different, and the thickness and span length of the pressure surface front edge UD main section 7 and the leading edge connecting plate main section 6 are also different. In the leading edge connecting plate main section 6, the outer surface of the suction surface connecting plate part is in a curved arc shape, and in terms of structural dimensions, there is a uniform gap between its outer surface and the inner surface of the leading edge part of the suction surface shell of the wind turbine blade, and the uniform gap is used to fill the structural adhesive.

[0051] like Figure 3 As shown, the processing and preparation of the above-mentioned integrated prefabricated component of the leading edge of the wind turbine blade of the present invention mainly includes the following steps:

[0052] SS1. Mould preparation: The preform mould 8 is fixedly set on the bracket in a suspended manner, and the inner cavity surface of the preform mould is adapted to the outer surface shape and size of the pressure surface front edge UD main section 7 and the suction surface connecting plate part of the leading edge connecting plate main section 6, and a long strip slit extending along the span direction is set on the inner cavity surface of the preform mould, and the chord position of the long strip slit is consistent with the leading edge line of the blade shell. Two silicone blocks 9 are set below the preform mould, which are located on the left and right sides of the long strip slit in the chord width direction and can be moved left and right. The gap between the two silicone blocks 9 forms the mould cavity of the flange flange section 5, and the flange flange sections 5 of different thicknesses are formed by adjusting the gap between the two silicone blocks 9. In addition, the chord width of the inner cavity surface of the above-mentioned preform mould 8 is greater than the chord width after the pressure surface front edge UD main section 7 and the leading edge connecting plate main section 6 are integrated, in order to facilitate the subsequent laying of auxiliary materials and the subsequent resin infusion.

[0053] SS2. Layer preparation: First, clean the inner surface of the preform mold 8, and then lay the demoulding cloth on the inner surface; second, lay the outermost glass fiber reinforced cloth, the main part of which is laid on the inner surface of the preform mold 8, and the part of which exceeds the leading edge line of the blade shell in the chord width direction extends out of the preform mold through the long strip slits opened, and extends into the gap between the two silicone blocks 9, and one or more layers of long strip glass fiber reinforced cloth are arranged along the span direction on the glass fiber reinforced cloth extending into the gap; then, lay several layers of pressure face front edge UD glass fiber reinforced cloth in sequence on the preform according to the chord and span staggered layers. On the outermost glass fiber reinforced cloth on the inner cavity surface of the preform mold 8, the closer the cloth layer is to the outside, the longer its span length is, and the closer it is to the leading edge line of the blade shell in the chord-wise width direction; then, several layers of leading edge connecting plate glass fiber reinforced cloth are laid in sequence on the inner cavity surface of the preform mold 8 in chord-wise and span-wise staggered layers, the closer the cloth layer is to the outside, the longer its span length is, and the wider the area covering the main section 7 of the front edge UD of the pressure surface in the chord-wise width direction is, the area covering the main section 7 of the front edge UD of the pressure surface forms the ply of the pressure surface connecting plate part, and the remaining area forms the ply of the suction surface connecting plate part;

[0054] SS3. Curing and forming: Auxiliary materials are laid on the inner surface of the preform mold 8 in sequence. The auxiliary materials include at least a demoulding cloth, an isolation film, a dense mesh, an air bridge and a vacuum bag. Then, the resin is vacuum infused and cured. After the resin is completely cured, the auxiliary materials are removed, and the edge of the preform is polished according to the design and process requirements to obtain an integrated prefabricated component of the leading edge of the blade with a flanging flange.

[0055] like Figure 1 As shown, when the wind turbine blade leading edge integrated prefabricated component of the present invention is used to process and produce the wind turbine blade pressure surface shell, the following steps are mainly included:

[0056] SS1. Pre-preparing the leading edge integral prefabricated member 3 according to the above method of the present invention;

[0057] SS2. Laying and curing: First, lay the outer skin 1, the blade root reinforcement prefabricated part 2 and the blade root reinforcement layer under the bolt sleeve on the blade pressure surface shell mold; then, place the leading edge integrated prefabricated component 3 on the leading edge position of the blade pressure surface shell mold by hoisting, and place the flanged flange section 5 on the edge top surface of the blade pressure surface shell mold to support and fix the entire leading edge integrated prefabricated component 3 by the flanged flange section 5 to prevent the leading edge integrated prefabricated component 3 from sliding downward due to gravity; then, for the blade pressure surface shell mold The other areas on the mold that are not covered by the leading edge integrated prefabricated component 3 continue to be laid with glass fiber cloth, including the laying of the main beam 4 and the trailing edge UD part. For the upper part of the leading edge integrated prefabricated component 3 on the blade pressure surface shell mold, the leading edge core material is laid from the leading edge of the main beam to the area at a certain distance from the leading edge line, and the leading edge core material and the leading edge integrated prefabricated component 3 are overlapped. Then, subsequent materials including the trailing edge core material, the blade root reinforcement on the bolt sleeve, the inner skin, etc. are laid; finally, the resin is poured and the resin is cured;

[0058] SS3. After the resin on the blade pressure surface shell mold is cured, the flange section 5 of the leading edge integrated prefabricated component 3 is polished and cut off to form the blade pressure surface shell to avoid affecting the subsequent mold closing of the blade pressure surface shell and the suction surface shell.

[0059] Through the above embodiments, the purpose of the present invention is fully and effectively achieved. Any equivalent or simple changes made according to the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. The technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all belong to the protection scope of the present invention.

Claims

1. A prefabricated integral component of the leading edge of a wind turbine blade, comprising a pressure surface front edge UD main section, a leading edge connecting plate main section and a flanging flange section, characterized in that: The pressure surface front edge UD main section, the front edge connecting plate main section and the flanging flange section are prefabricated in one piece, wherein: The main section of the pressure surface edge UD is in the shape of a curved plate as a whole, and its outer surface shape is adapted to the inner surface shape of the leading edge part of the pressure surface shell of the wind turbine blade, and the leading edge of the main section of the pressure surface edge UD does not exceed the leading edge line of the blade shell in the chord width direction and is flush with the leading edge line of the blade shell; The main body section of the leading edge connecting plate is in the shape of a curved plate as a whole, and is symmetrical about the leading edge line of the blade shell in the chord width direction, and includes a pressure surface connecting plate portion located on one side of the leading edge line of the blade shell and a suction surface connecting plate portion located on the other side of the leading edge line of the blade shell in the chord width direction, and the pressure surface connecting plate portion is arranged on the inner side of the main body section of the pressure surface front edge UD in the thickness direction, and the shape of the outer surface of the suction surface connecting plate portion is adapted to the shape of the inner surface of the leading edge portion of the suction surface shell of the wind turbine blade; The flanged flange section is in the shape of a straight plate as a whole, and is perpendicular to the leading edge line of the blade shell in the chord width direction. In the chord cross section, the angle between the flanged flange section and the front edge UD main section of the pressure surface is not less than 90 degrees.

2. The integrated prefabricated component for the leading edge of a wind turbine blade according to claim 1, characterized in that: The pressure surface front edge UD main section, the front edge connecting plate main section and the flanged flange section are integrally formed, and each includes multiple layers of glass fiber reinforced cloth sequentially laid from outside to inside and integrally cured by resin, wherein: The outermost glass fiber reinforced cloth forms the outer surface layer of the pressure surface front edge UD main section and the flanged flange section, and the portion thereof that does not exceed the leading edge line of the blade shell in the chord-wise width direction forms the outer surface layer of the pressure surface front edge UD main section, and the portion thereof that exceeds the leading edge line of the blade shell in the chord-wise width direction forms the outer surface layer of the flanged flange section; In the glass fiber reinforced cloth layers of the UD main section at the front edge of the pressure surface, the chord-wise widths of the cloth layers are the same, and the layers are stacked and staggered in the thickness direction. The closer the cloth layer is to the outside, the longer its span-wise length is, and the closer it is to the leading edge line of the blade shell in the chord-wise width direction. In the glass fiber reinforced cloth plies of the main section of the leading edge connection plate, the chord-wise widths of the cloth layers are the same, and the layers are stacked and staggered in the thickness direction. The closer the cloth layer is to the outside, the longer its span-wise length is, and the wider the area covering the main section of the front edge UD of the pressure surface is in the chord-wise width direction. The area covering the main section of the front edge UD of the pressure surface forms the plies of the pressure surface connection plate portion, and the remaining area forms the plies of the suction surface connection plate portion. In the glass fiber reinforced cloth ply of the flange section, one or more layers of long glass fiber reinforced cloth are sequentially laid along the span direction on the surface of the portion of the outermost glass fiber reinforced cloth that exceeds the leading edge line of the blade shell in the chord-wise width direction.

3. The integrated prefabricated component for the leading edge of a wind turbine blade according to claim 1, characterized in that: The glass fiber reinforced cloth materials used in the front edge UD main section of the pressure surface and the front edge connecting plate main section are different, and the thickness and span length of the front edge UD main section of the pressure surface and the front edge connecting plate main section are also different.

4. The integrated prefabricated component for the leading edge of a wind turbine blade according to claim 1, characterized in that: The outer surface of the suction surface connecting plate portion is in a curved arc shape, and in terms of structural dimensions, there is a uniform gap between the outer surface and the inner surface of the front edge portion of the suction surface shell of the wind turbine blade, and the uniform gap is used to fill the structural adhesive.

5. A method for preparing a prefabricated integral component of a leading edge of a wind turbine blade according to any one of claims 1 to 4, characterized in that: The preparation method comprises at least the following steps: SS1. Mold preparation: The preform mold is fixedly set on the bracket in a suspended manner, the inner cavity surface of the preform mold is adapted to the outer surface shape and size of the pressure surface front edge UD main section and the suction surface connecting plate part of the leading edge connecting plate main section, and a long strip slit extending along the span direction is set on the inner cavity surface of the preform mold, the chord position of the long strip slit is consistent with the leading edge line of the blade shell, and two silicone blocks are set below the preform mold, which are located on the left and right sides of the long strip slit in the chord width direction and can be moved left and right to adjust, and the gap between the two silicone blocks forms a mold cavity of the flanging flange section, and the flanging flange sections of different thicknesses are formed by adjusting the gap between the two silicone blocks; SS2. Layer preparation: First, the inner cavity surface of the preform mold is cleaned, and then a demoulding cloth is laid on the inner cavity surface; Secondly, the outermost glass fiber reinforced cloth is laid, the main part of which is laid on the inner cavity surface of the preform mold, and the part of which exceeds the leading edge line of the blade shell in the chord width direction extends out of the preform mold through the long strip slit and extends into the gap between the two silicone blocks, and one or more layers of long strip glass fiber reinforced cloth are arranged along the span direction on the glass fiber reinforced cloth extending into the gap; Afterwards, several layers of UD glass fiber reinforced cloth at the front edge of the pressure surface are sequentially laid on the outermost glass fiber reinforced cloth on the inner cavity surface of the preform mold in staggered layers in the chord direction and the span direction. The closer the cloth layer is to the outside, the longer its span length is, and the closer it is to the leading edge line of the blade shell in the chord width direction. Then, several layers of leading edge connecting plate glass fiber reinforced cloth are sequentially laid on the inner cavity surface of the preform mold in staggered layers in the chord direction and the span direction. The closer the cloth layer is to the outside, the longer its span length is, and the wider the area covering the main section of the front edge UD of the pressure surface in the chord width direction is. The area covering the main section of the front edge UD of the pressure surface forms the ply of the pressure surface connecting plate part, and the remaining area forms the ply of the suction surface connecting plate part. SS3. Curing and forming: Auxiliary materials are laid on the inner cavity surface of the preform mold in sequence, and the auxiliary materials include at least a demoulding cloth, an isolation film, a dense mesh, an air bridge and a vacuum bag. Then, the resin is vacuum infused and cured. After the resin is completely cured, the auxiliary materials are removed, and the edge of the preform is polished according to the design and process requirements to obtain an integrated prefabricated component of the leading edge of the blade with a flanging flange.

6. The preparation method according to claim 5, characterized in that: The chord-wise width of the inner cavity surface of the preform mold is greater than the chord-wise width of the main body section of the front edge UD of the pressure surface and the main body section of the front edge connecting plate after being integrated into one.

7. A method for preparing a pressure surface shell of a wind turbine blade, characterized in that: The preparation method comprises at least the following steps: SS1. Pre-preparing a prefabricated integral leading edge component of a wind turbine blade according to the method of claim 5 or 6; SS2. Lamination and curing: First, the outer skin, blade root reinforcement preform and blade root reinforcement layer under the bolt sleeve are laid on the blade pressure surface shell mold; Then, the leading edge integrated prefabricated component is placed on the leading edge position of the blade pressure surface shell mold in a hoisting manner, and its flanged flange section is placed on the edge top surface of the blade pressure surface shell mold, so that the flanged flange section supports and fixes the entire leading edge integrated prefabricated component, thereby preventing the leading edge integrated prefabricated component from sliding downward due to gravity; Afterwards, for other areas on the blade pressure surface shell mold that are not covered by the leading edge integrated prefabricated component, continue to lay the glass fiber cloth, including laying the main beam and the trailing edge UD parts; for the upper part of the leading edge integrated prefabricated component on the blade pressure surface shell mold, lay the leading edge core material from the leading edge of the main beam to the area at a certain distance from the leading edge line, and then lay the subsequent materials including the trailing edge core material, the blade root reinforcement on the bolt sleeve, and the inner skin; Finally, the resin infusion and resin curing process is carried out; SS3. After the resin on the blade pressure surface shell mold is cured, the flanged section of the leading edge integrated prefabricated component is ground and cut off to form the blade pressure surface shell.

8. The preparation method according to claim 7, characterized in that: The leading edge core material above the leading edge integrated prefabricated component on the blade pressure surface shell mold is overlapped with the leading edge integrated prefabricated component, and the chord-wise chamfer of the leading edge core material is adapted to the chord-wise staggered layer of the glass fiber cloth layer of the prefabricated component.

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