Blade root pre-embedded part, blade root assembly with pre-embedded connecting structure and blade

Abstract

The application provides a blade root embedded part, a root assembly with an embedded connecting structure, and a blade. The blade root embedded part comprises a sleeve body, a first curved surface area and a second curved surface area are arranged around the outer circumferential surface of the sleeve body; a pulling part is arranged in the first curved surface area of the sleeve body, and the pulling part is formed by extending the outer circumferential surface of the sleeve body away from the axial direction of the sleeve body. In use, the blade root embedded part is embedded in the embedded position in the blade root, the pulling part in the first curved surface area can increase the contact area between the sleeve body and the blade root, improve the connecting strength between the blade root embedded part and the blade root, and further improve the pulling performance of the blade root embedded part. Moreover, the second curved surface area is not provided with a pulling part, and can avoid the corresponding area in the blade root, thereby facilitating the installation and use of the blade root embedded part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation, in particular to a blade root pre-embedded part, a root assembly with a pre-embedded connection structure and a blade. BACKGROUND

[0002] With the development of the wind power industry, the size, length and weight of wind power blades are becoming larger and larger, which increases the blade root connection load accordingly, and higher requirements are placed on the connection strength of the wind power blade root and the hub. At present, there are mainly two forms of blade root connection, namely drilling connection and pre-embedded connection. Compared with the drilling connection, the pre-embedded connection is more widely used.

[0003] The failure of the pre-embedded connection structure is mainly the fracture of the bolt and the pull-out damage of the pre-embedded bolt sleeve. In order to deal with the pull-out damage of the pre-embedded bolt sleeve, some solutions are provided in the related art, for example, in the patent application file with the publication number CN115111249A and the publication date of September 27, 2022, and the invention name of a pre-embedded bolt sleeve and a wind turbine, the outer surface of the pre-embedded bolt sleeve is modified, a plurality of grooves with different depths are designed, and the pre-embedded bolt is wound with a glass fiber layer during use; in the patent application file with the publication number CN114770984A and the publication date of July 22, 2022, and the invention name of a bolt sleeve for connecting the root of a wind power blade and a method for improving the pre-embedded strength, the outer thread of the bolt sleeve is modified, a micro-groove structure is processed, and the groove is filled with a wire bundle during use.

[0004] Although the above solutions strengthen the connection between the bolt sleeve and the wound wire bundle, the bolt sleeve and the wound wire bundle can still be pulled out as a whole, and the connection strength is not ideal. SUMMARY

[0005] In view of the above problems, the present application provides a blade root pre-embedded part, a root assembly with a pre-embedded connection structure and a blade, which is beneficial to improve the connection strength.

[0006] In a first aspect, the blade root pre-embedded part provided by some embodiments of the present application comprises a sleeve body and a pull-out part; the sleeve body is provided with a first curved surface area and a second curved surface area around the outer peripheral surface of the sleeve body; the pull-out part is arranged in the first curved surface area of the sleeve body, and the pull-out part is formed by extending the outer peripheral surface of the sleeve body away from the axis direction of the sleeve body.

[0007] According to the blade root pre-embedded part provided by some embodiments of the present application, on the side where the sleeve body penetrates the bolt, the included angle between the extension direction of the pull-out part and the axis of the sleeve body is R; the value of R ranges from 30° to 90°.

[0008] According to the blade root embedded part provided by some embodiments of the present application, the value of R is 90°.

[0009] According to the blade root embedded part provided by some embodiments of the present application, the number of the first curved surface areas is two, which are symmetrically distributed on the sleeve body; the number of the second curved surface areas is two, which are symmetrically distributed on the sleeve body; the first curved surface areas are located between the second curved surface areas, and the area of the first curved surface area is smaller than that of the second curved surface area.

[0010] According to the blade root embedded part provided by some embodiments of the present application, the straight line where the extension direction of the pulling part is located intersects with the axis of the sleeve body.

[0011] According to the blade root embedded part provided by some embodiments of the present application, the straight line where the extension direction of the pulling part is located is non-planar with the axis of the sleeve body.

[0012] According to the blade root embedded part provided by some embodiments of the present application, part of the straight line where the extension direction of the pulling part is located intersects with the axis of the sleeve body, and part of the straight line where the extension direction of the pulling part is located is non-planar with the axis of the sleeve body.

[0013] According to the blade root embedded part provided by some embodiments of the present application, the included angle between the pulling parts in the same first curved surface area is 0°, and the included angle between the pulling parts in the two first curved surface areas is 180°.

[0014] According to the blade root embedded part provided by some embodiments of the present application, along the axis direction of the sleeve body, the outer peripheral surface of the sleeve body comprises alternatingly distributed concave parts and convex parts; in the first curved surface area, the pulling parts are located on the concave parts and / or the convex parts.

[0015] According to the blade root embedded part provided by some embodiments of the present application, in the first curved surface area, the pulling parts are located on the convex parts.

[0016] According to the blade root embedded part provided by some embodiments of the present application, the distance between the free end of the pulling part located on the concave part and the axis of the sleeve body is a, the distance between the free end of the pulling part located on the convex part and the axis of the sleeve body is b, and the value of a is not greater than the value of b.

[0017] According to the blade root embedded part provided by some embodiments of the present application, the value of a is equal to the value of b.

[0018] According to the blade root embedded part provided by some embodiments of the present application, the pulling part is in the shape of a column, and is integrally formed with the sleeve body and / or detachably connected with the sleeve body.

[0019] According to some embodiments of the blade root pre-embedded part, the cross-sectional area of the pull-out part gradually decreases along the extension direction of the pull-out part.

[0020] According to some embodiments of the blade root pre-embedded part, the cross-sectional area of the pull-out part is constant along the extension direction of the pull-out part.

[0021] According to some embodiments of the blade root pre-embedded part, the cross-sectional area of a part of the pull-out part gradually decreases along the extension direction of the pull-out part, and the cross-sectional area of another part of the pull-out part is constant.

[0022] According to some embodiments of the blade root pre-embedded part, the sleeve body and the pull-out part are detachably connected through threads.

[0023] According to some embodiments of the blade root pre-embedded part, an outer convex section is arranged at the end away from the sleeve body, and the outer convex section is hook-shaped.

[0024] According to some embodiments of the blade root pre-embedded part, the cross-sectional area of the outer convex section is greater than that of the adjacent part of the pull-out part.

[0025] According to some embodiments of the blade root pre-embedded part, an outer convex section is arranged at the end away from the sleeve body, the outer convex section is hook-shaped, and the cross-sectional area of the outer convex section is greater than that of the adjacent part of the pull-out part.

[0026] According to some embodiments of the blade root pre-embedded part, the hook shape of the outer convex section is any one of L-shaped, T-shaped, and J-shaped.

[0027] In a second aspect, some embodiments of the present application provide a blade root assembly with a pre-embedded connection structure, comprising a blade root body and a pre-embedded connection structure; the blade root body comprises an outer wall, an inner wall, and a filler layer filled between the outer wall and the inner wall; the pre-embedded connection structure comprises the blade root pre-embedded part embedded in the filler layer; the sleeve body of the blade root pre-embedded part is pre-embedded into the filler layer, and the pull-out part of the blade root pre-embedded part is inserted into the outer wall and / or the inner wall.

[0028] According to some embodiments of the blade root assembly with a pre-embedded connection structure, the thickness of the outer wall is greater than the depth of the pull-out part inserted into the outer wall, and the difference between the two is in the range of 0.5 mm to 3.5 mm; the thickness of the inner wall is greater than the depth of the pull-out part inserted into the inner wall, and the difference between the two is in the range of 0.5 mm to 3.5 mm.

[0029] According to the blade root assembly with the pre-buried connecting structure provided by some embodiments of the present application, the difference between the thickness of the outer wall and the depth of the insertion of the pull-out part into the outer wall is 2 mm; and the difference between the thickness of the inner wall and the depth of the insertion of the pull-out part into the inner wall is 2 mm.

[0030] According to the blade root assembly with the pre-buried connecting structure provided by some embodiments of the present application, the pre-buried connecting structure further comprises a winding layer, the winding layer is wound on the outer circumferential surface of the sleeve body, and the thickness of the winding layer is less than the protruding height of the pull-out part on the sleeve body.

[0031] According to the blade root assembly with the pre-buried connecting structure provided by some embodiments of the present application, the winding layer is a fiber bundle winding layer.

[0032] According to the blade root assembly with the pre-buried connecting structure provided by some embodiments of the present application, the blade root body is in a circular ring shape, and the sleeve body is in a plurality, and the plurality of sleeve bodies are distributed along the circumference of the filler layer.

[0033] According to the blade root assembly with the pre-buried connecting structure provided by some embodiments of the present application, the pre-buried connecting structure further comprises a filler block, the filler block is in a plurality, and the plurality of filler blocks are distributed along the circumference of the filler layer, each of the filler blocks is located between two sleeve bodies and is attached to the sleeve body.

[0034] According to the blade root assembly with the pre-buried connecting structure provided by some embodiments of the present application, the pre-buried connecting structure further comprises a wedge-shaped block, one end of the wedge-shaped block is inserted into a wedge-shaped area of the filler layer, and the other end of the wedge-shaped block abuts against the end of the sleeve body.

[0035] According to the blade root assembly with the pre-buried connecting structure provided by some embodiments of the present application, a sealing element is installed at the abutting position of the wedge-shaped block and the sleeve body, the sealing element comprises a sealing plug and a sealing ring, and the sealing ring is located between the sealing plug and the sleeve body.

[0036] In a third aspect, some embodiments of the present application provide a blade, which comprises the blade root assembly with the pre-buried connecting structure provided by any of the technical solutions described above.

[0037] The technical solutions provided by the embodiments of the present application at least bring the following beneficial effects:

[0038] Some embodiments of the present application provide a blade root embedded part, a root assembly with embedded connection structure and a blade. The blade root embedded part comprises a sleeve body and a pulling part, the pulling part is located in a first curved surface area of the outer circumferential surface of the sleeve body and extends away from the axis direction of the sleeve body. The blade root embedded part is embedded in the embedded position in the blade root during use, the pulling part in the first curved surface area can increase the contact area between the sleeve body and the root, improve the connection strength between the blade root embedded part and the root, and further improve the pulling performance of the blade root embedded part. Moreover, the second curved surface area is not provided with a pulling part, which can avoid the corresponding area in the root, and facilitate the installation and use of the blade root embedded part.

[0039] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the content of the specification can be implemented, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0040] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components.

[0041] Figure 1 A perspective structural schematic diagram of the blade root embedded part provided by some embodiments of the present application;

[0042] Figure 2 A front structural schematic diagram of the blade root embedded part provided by some embodiments of the present application;

[0043] Figure 3 A perspective structural schematic diagram of the blade root embedded part provided by some embodiments of the present application; Figure 2 A local enlarged schematic diagram at A;

[0044] Figure 4 A front structural schematic diagram of the blade root embedded part provided by some embodiments of the present application;

[0045] Figure 5 A perspective structural schematic diagram of the blade root embedded part provided by some embodiments of the present application; Figure 4 A local enlarged schematic diagram at B;

[0046] Figure 6 A front structural schematic diagram of the blade root embedded part provided by some embodiments of the present application;

[0047] Figure 7 A perspective structural schematic diagram of the blade root embedded part provided by some embodiments of the present application; Figure 6 A local enlarged schematic diagram at C;

[0048] Figure 8 A side view of a blade root pre-embedded part according to some embodiments of the present application;

[0049] Figure 9 A side view of a blade root pre-embedded part according to some embodiments of the present application;

[0050] Figure 10 A longitudinal sectional view of a blade root assembly with a pre-embedded connecting structure according to some embodiments of the present application;

[0051] Figure 11 A longitudinal sectional view of a blade root assembly according to some embodiments of the present application; Figure 10 A local enlarged view at D;

[0052] Figure 12 A longitudinal sectional view of a blade root assembly with a pre-embedded connecting structure according to some embodiments of the present application;

[0053] In the drawings:

[0054] 1 - sleeve body; 11 - second arc surface area; 12 - first arc surface area; 13 - convex part; 14 - concave part; 2 - pulling part; 3 - inner wall; 4 - outer wall; 5 - wedge block; 6 - winding layer; 7 - filling block. DETAILED DESCRIPTION

[0055] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0056] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0057] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0058] In addition, the technical terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0061] Technical terms are explained as follows:

[0062] Drilling connection: After the composite wind turbine blade is formed, holes are drilled vertically and uniformly on the end face of the blade root, so that one end of the stud can be embedded into the blade root shell along the radial direction of the blade root through the hole, and connected and fixed with the transverse nut, and the other end is embedded into the fan hub, completing the connection of the blade root shell and the fan hub.

[0063] Pre-buried connection: The pre-buried part (generally including bolt sleeve, glass fiber reinforced plastic wedge block, circular foam wedge block) is pre-buried in the blade root composite material layer by embedding, and is poured together with the blade skin after the blade is prepared and formed. After the blade is prepared and formed, the stud is screwed into the bolt sleeve to complete the connection of the blade and the fan hub.

[0064] Bolt sleeve drawing force: the combined force of the metal deformation resistance of the bolt sleeve and the frictional force of the contact surface between the bolt sleeve and the composite material during the drawing process.

[0065] With the increasing size, length and weight of wind turbine blades, the load of the blade root connection is also increasing, and the connection strength between the wind turbine blade root and the hub is required to be higher. The current blade root connection mainly has two forms of drilling connection and pre-buried connection, wherein the failure modes of the pre-buried connection structure are mainly bolt fracture and pre-buried bolt sleeve pull-out damage. In order to deal with the pre-buried bolt sleeve pull-out damage, the outer circumferential surface of the pre-buried bolt sleeve is treated (for example, the roughness is increased, the cleanliness is increased, a groove is processed, and a fiber bundle is wound). However, the result is not ideal, and the bolt sleeve and the fiber bundle are still pulled out as a whole.

[0066] Some embodiments of the present application provide a blade root pre-buried part, a blade root assembly with a pre-buried connection structure and a blade, which can improve the connection strength between the blade root pre-buried part and the blade root.

[0067] Please refer to Figure 1 , Figure 1 The present application provides a three-dimensional structure diagram of a blade root pre-buried part. The dashed line is only used to better distinguish the first arc surface area 12 and the second arc surface area 11, and is not a physical structure.

[0068] The blade root pre-buried part provided by some embodiments of the present application includes a sleeve body 1 and a pull-out part 2. On the sleeve body 1, a first arc surface area 12 and a second arc surface area 11 are arranged around the outer circumferential surface of the sleeve body 1, and the pull-out part 2 is arranged in the first arc surface area 12 of the sleeve body 1. The pull-out part 2 is formed by extending the outer circumferential surface of the sleeve body 1 away from the axis direction of the sleeve body 1.

[0069] On the outer circumferential surface of the sleeve body 1, the first arc surface area 12 and the second arc surface area 11 are arranged to clearly distinguish the distribution area of the pull-out part 2, and the first arc surface area 12 and the second arc surface area 11 do not have actual structures to limit at the junction. The sleeve body 1 is cut along a plane perpendicular to the axis of the sleeve body 1, and the outer contour of the sleeve body 1 can be any one of a circle, an ellipse, a polygon, etc. An internal thread is processed in the sleeve for threaded connection with a bolt, a stud, etc.

[0070] The pull-out part 2 protrudes from the outer circumferential surface of the sleeve body 1 on the outer circumferential surface of the sleeve body 1, and one end of the pull-out part 2 is connected to the sleeve body 1 and the other end is a free end. Compared with the end connected to the sleeve body 1, the free end of the pull-out part 2 is farther away from the axis of the sleeve body 1. When the pull-out part 2 extends away from the axis direction of the sleeve body 1, the extension direction of the pull-out part 2 can have any angle with the axis of the sleeve body 1, and the extension direction of the pull-out part 2 can intersect or be in different planes with the axis of the sleeve body 1.

[0071] In the above structure, the pulling portion 2 is located in the first curved surface area 12 of the outer peripheral surface of the sleeve body 1 and extends away from the axis direction of the sleeve body 1. The blade root embedded part is embedded in the embedded position in the blade root in use. The pulling portion 2 in the first curved surface area 12 can increase the contact area of the sleeve body 1 and the blade root, especially in the thickness direction of the blade root (the radial direction of the blade root). The pulling portion 2 can be deeply embedded into the blade root and connected with the inner wall 3 and / or the outer wall 4 of the blade root, thereby improving the connection strength of the blade root embedded part and the blade root and improving the pulling performance of the blade root embedded part. In addition, the second curved surface area 11 of the sleeve body 1 is not provided with the pulling portion 2, which can avoid the corresponding area (for example, the area where the UD block is located) in the blade root, thereby facilitating the installation and use of the blade root embedded part.

[0072] Please refer to Figure 2 , Figure 3 , Figure 6 to Figure 9 , wherein Figure 2 is a front structure schematic diagram of a blade root embedded part provided by some embodiments of the present application; Figure 3 is a front structure schematic diagram of a blade root embedded part provided by some embodiments of the present application; Figure 2 is a partial enlarged schematic diagram at A; Figure 6 is a front structure schematic diagram of a blade root embedded part provided by some other embodiments of the present application; Figure 7 is a front structure schematic diagram of a blade root embedded part provided by some embodiments of the present application; Figure 6 is a partial enlarged schematic diagram at C; Figure 8 is a side structure schematic diagram of a blade root embedded part provided by some embodiments of the present application; Figure 9 is a side structure schematic diagram of a blade root embedded part provided by some other embodiments of the present application. The dotted line corresponds to the axis of the sleeve body 1, the center line of the sleeve body 1, and the extension direction of the pulling portion 2. The left side in the figure is the side where the bolt (or stud) penetrates.

[0073] In some embodiments of the present application, the angle between the extension direction of the pulling portion 2 and the axis of the sleeve body 1 on the side where the sleeve body 1 penetrates the bolt is R, and the value of R ranges from 30° to 90°. For example, the value of R can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, or 90°, or any intermediate value between any two adjacent endpoint values.

[0074] In the above structure, the angle R is not an obtuse angle, and the pulling portion 2 can better penetrate into the blade root when subjected to pulling action and is not easy to slide out of the original position. The angle R is not an acute angle less than 30°, which can extend the pulling portion 2 as far as possible from the outer peripheral surface of the sleeve body 1, increase the contact of the blade root embedded part with the blade root in the radial direction of the blade root embedded part, and avoid the blade root embedded part from being pulled out together with the nearby blade root structure when subjected to pulling action. For example, Figure 6 andFigure 7 As shown, when the included angle R is an acute angle not less than 30°, the sleeve body 1 can be embedded into the blade root more tightly after being subjected to the pulling action.

[0075] As shown in Figure 2 , Figure 3 , Figure 8 and Figure 9 , in some embodiments of the present application, R is 90°.

[0076] When R is 90°, the axis of the sleeve body 1 is perpendicular to the extension direction of the pulling part 2. At this time, the axis of the sleeve body 1 and the extension direction of the pulling part 2 can intersect, or be in different planes, or make part of the extension direction of the pulling part 2 intersect with the axis of the sleeve body 1 and part of the extension direction of the pulling part 2 be in different planes with the axis of the sleeve body 1.

[0077] When the blade root pre-embedded part is used, the wire harness can be wound around the outer circumferential surface of the sleeve body 1. When R is 90°, the wire harness will not be hindered by the pulling part 2, and the operation is more convenient.

[0078] As shown in Figure 1 , Figure 8 and Figure 9 , in some embodiments of the present application, the number of first arc surface areas 12 is two, which are symmetrically distributed on the sleeve body 1; the number of second arc surface areas 11 is two, which are symmetrically distributed on the sleeve body 1; the first arc surface area 12 is located between the second arc surface areas 11, and the area of the first arc surface area 12 is smaller than that of the second arc surface area 11.

[0079] In the above structure, the included angle of the two first arc surface areas 12 is 180°, and the included angle of the two second arc surface areas 11 is 180°. The pulling part 2 is distributed in the two first arc surface areas 12, and the two first arc surface areas 12 correspond to the outer wall 4 and the inside of the blade root respectively when pre-embedded. The two second arc surface areas 11 correspond to the filling blocks 7 (UD blocks) in the blade root respectively. The area of the first arc surface area 12 is smaller than that of the second arc surface area 11, which can avoid interference between the pulling part 2 and the UD blocks, and facilitate the installation of the blade root pre-embedded part during pre-embedding operation.

[0080] As shown in Figure 3 , Figure 7 and Figure 8 , in some embodiments of the present application, the straight line where the extension direction of the pulling part 2 is located intersects with the axis of the sleeve body 1.

[0081] When the straight line where the extension direction of the pulling part 2 is located intersects with the axis of the sleeve body 1, the straight line where the extension direction of the pulling part 2 is located and the axis of the sleeve body 1 can be perpendicular (as shown in Figure 3As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). Figure 7 As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0082] As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0083] As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). Figure 9 As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0084] As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). Figure 9 As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0085] As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). Figure 9 As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0086] As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). Figure 9 As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0087] As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0088] As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). Figure 9 As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0089] As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2). As shown in FIG. 1, the line where the extension direction of the gripping and pulling part 2 is located and the axis of the sleeve body 1 can form an acute angle (such as 30°, as shown in FIG. 1) or an obtuse angle (such as 150°, as shown in FIG. 2).

[0090] In the above structure, the plurality of pulling parts 2 in one first arc surface area 12 are arranged in parallel, which facilitates the placement on the lower layer of the material during embedding. The plurality of pulling parts 2 in the other first arc surface area 12 are arranged in parallel, which facilitates the placement of the upper layer of the material on it (the upper layer of the material and the lower layer of the material correspond to the inner wall 3 and the outer wall 4 of the blade root after forming). Since the straight lines in the extension direction of all the pulling parts 2 are parallel, the blade root embedding part and the upper layer of the material can be placed on the lower layer of the material in sequence during operation, without the need to adjust the blade root embedding part to ensure that each pulling part 2 is inserted into the corresponding auxiliary material. This can greatly facilitate the operation of workers and save on-site operation time.

[0091] Please refer to Figure 4 and Figure 5 , Figure 4 the front structure schematic diagram of the blade root embedding part provided by some embodiments of the present application; Figure 5 the front structure schematic diagram of the blade root embedding part provided by some embodiments of the present application; Figure 4 the local enlarged schematic diagram at B. Wherein L represents the distance between the free end of the pulling part 2 and the axis of the sleeve body 1.

[0092] In some embodiments of the present application, along the axis direction of the sleeve body 1, the outer peripheral surface of the sleeve body 1 includes alternating concave parts 14 and convex parts 13; in the first arc surface area 12, the pulling parts 2 are located on the concave parts 14 and / or the convex parts 13.

[0093] As shown in Figure 4 and Figure 5 , the pulling parts 2 are distributed on both the concave parts 14 and the convex parts 13; as shown in Figure 2 and Figure 3 , the pulling parts 2 are only distributed on the convex parts 13.

[0094] It is worth noting that the outer peripheral surface of the sleeve body 1 is a concave-convex surface with concave and convex parts alternating along the axis direction, and the concave-convex surface includes the concave parts 14 and the convex parts 13. The first arc surface area 12 and the second arc surface area 11 on the outer peripheral surface of the sleeve body 1 are the division of specific areas of the concave-convex surface. That is, the first arc surface area 12 is a concave-convex surface along the axis direction of the sleeve body 1, and the second arc surface area 11 is also a concave-convex surface along the axis direction of the sleeve body 1.

[0095] For the design of the concave-convex surface, along the axis of the sleeve body 1, the concave-convex surface can be wavy, zigzag, etc. The concave-convex surface can also be thread-like formed on the outer peripheral surface of the sleeve body 1 around the axis of the sleeve body 1. The concave-convex surface can be subjected to surface sandblasting treatment to improve roughness and cleanliness, thereby improving the connection strength during connection.

[0096] In the above structure, the concave-convex surface and the pull-out part 2 are arranged on the outer peripheral surface of the sleeve body 1 at the same time, which not only can increase the contact area between the blade root pre-embedded part and the blade root during use, but also can make the pull-out part 2 inserted into the gap position of the blade root laying material (the laying material can be a woven structure, and there is a gap between the woven lines which are interwoven longitudinally and transversely), thereby improving the connection strength between the blade root pre-embedded part and the blade root without damaging the structure of the laying material, and improving the pull-out resistance of the blade root pre-embedded part.

[0097] As shown in Figure 2 and Figure 3 , in some embodiments of the present application, in the first arc surface area 12, the pull-out part 2 is located on the convex part 13.

[0098] In the above structure, in the two first arc surface areas 12, the pull-out part 2 is arranged only on the convex part 13, and the concave part 14 is not provided with the pull-out part 2, which is beneficial to the subsequent fiber bundle winding step of the sleeve body 1, reduces the influence of the pull-out part 2 on the winding fiber bundle, and can avoid defects such as pouring cavity.

[0099] As shown in Figure 5 , in some embodiments of the present application, the distance between the free end of the pull-out part 2 located on the concave part 14 and the axis of the sleeve body 1 is a; the distance between the free end of the pull-out part 2 located on the convex part 13 and the axis of the sleeve body 1 is b; the value of a is not greater than the value of b.

[0100] When the pull-out part 2 is arranged on the concave part 14 and the convex part 13, the value of the distance b between the free end of the pull-out part 2 located on the convex part 13 and the axis of the sleeve body 1 is greater than or equal to the value of the distance a between the free end of the pull-out part 2 located on the concave part 14 and the axis of the sleeve body 1.

[0101] When the value of a is less than the value of b, the pull-out part 2 located on the convex part 13 and the pull-out part 2 located on the concave part 14 can adopt the same specification (the same shape), thereby improving interchangeability.

[0102] When the value of a is equal to the value of b, that is, as shown in Figure 5 , the value of a and the value of b are both the length of L in the figure, the length of the pull-out part 2 located on the concave part 14 is greater than the length of the pull-out part 2 located on the convex part 13, and at this time, the risk of pouring cavity due to the different values of a and b can be avoided.

[0103] As shown in Figure 5 , in some embodiments of the present application, in order to ensure the pouring quality at the blade root, the corresponding pull-out parts 2 on the concave part 14 and the convex part 13 are designed to have the same value of a and b.

[0104] As shown in Figure 1As shown in the drawings, in some embodiments of the present application, the pulling portion 2 is in the shape of a column, and is located on the outer circumferential surface of the sleeve body 1. The pulling portion 2 can be formed integrally with the sleeve body 1, or can be detachably connected with the sleeve body 1. Alternatively, part of the pulling portion 2 can be formed integrally with the sleeve body 1, and the other part of the pulling portion 2 can be detachably connected with the sleeve body 1.

[0105] When the pulling portion 2 is formed integrally with the sleeve body 1, the pulling portion 2 and the sleeve body 1 can be adhesively connected, or can be welded together. Alternatively, the pulling portion 2 and the sleeve body 1 can be integrally formed by using a 3D printing technology.

[0106] The pulling portion 2 can be in the shape of a column, such as a circular column, an elliptical column, or a polygonal column. When the pulling portion 2 is in the shape of a polygonal column, the cross section of the pulling portion 2 can be a regular polygon, such as a regular pentagon or a regular hexagon.

[0107] In some embodiments of the present application, in order to facilitate the installation of the pulling portion 2 on the sleeve body 1, a hole is drilled on the outer circumferential surface of the sleeve body 1, and an internal thread is formed in the hole. An external thread is formed on the end of the pulling portion 2 that is connected to the sleeve body 1. The pulling portion 2 is fastened to the sleeve body 1 by the cooperation of the external thread and the internal thread, thereby achieving the detachable connection of the sleeve body 1 and the pulling portion 2.

[0108] In the above structure, the detachable connection of the sleeve body 1 and the pulling portion 2 is achieved by the threaded connection, which facilitates the installation and adjustment of the pulling portion 2 on the sleeve body 1. In particular, when the radial direction of the sleeve body 1 coincides with the straight line along which the pulling portion 2 extends, only a threaded hole needs to be formed in the radial direction of the sleeve body 1, which facilitates the machining of the threaded hole.

[0109] As shown in the drawings, in some embodiments of the present application, the cross-sectional area of the pulling portion 2 gradually decreases along the extension direction of the pulling portion 2. Figure 8 Figure 9 As shown in the drawings, in some embodiments of the present application, the cross-sectional area of the pulling portion 2 gradually decreases along the extension direction of the pulling portion 2.

[0110] The cross-sectional area of the pulling portion 2 refers to the area of the cross section obtained by cutting the pulling portion 2 along a plane perpendicular to the extension direction of the pulling portion 2.

[0111] Along the extension direction of the pulling portion 2, the cross-sectional area of the end of the pulling portion 2 far from the sleeve body 1 (the free end) is small, and the cross-sectional area of the end of the pulling portion 2 close to the sleeve body 1 is large. When the cross-sectional area changes, it changes uniformly and continuously.

[0112] ​In the above structure, the pulling part 2 is relatively thick at the end close to the sleeve body 1, which can effectively improve the connection strength of the pulling part 2 and the sleeve body 1; the pulling part 2 is relatively thin at the end away from the sleeve body 1, which can be more easily inserted into the outer wall 4 and / or the inner wall 3 of the blade root.

[0113] In some embodiments of the present application, for the convenience of processing the pulling part 2, the cross-sectional area of the pulling part 2 is constant along the extension direction of the pulling part 2. In the processing of the pulling part 2, the rod material can be cut into several segments to directly obtain the pulling part 2.

[0114] In some embodiments of the present application, the convenience of processing the pulling part 2 and the convenience of embedding the blade root pre-embedded part can also be considered. Specifically, the pulling part 2 can be designed in two forms in combination, the cross-sectional area of a part of the pulling part 2 gradually decreases, and the cross-sectional area of another part of the pulling part 2 is constant along the extension direction of the pulling part 2.

[0115] In some embodiments of the present application, at the end away from the sleeve body 1, the pulling part 2 is provided with an outwardly convex segment, which can be hook-shaped.

[0116] In the extension direction of the pulling part 2, the pulling part 2 can be designed with a hook-shaped outwardly convex segment at the end where the free end is located. The hook shape can be a J-shaped hook, an L-shaped hook, or a T-shaped hook. For example, an arc-shaped bend can be provided to form a J-shaped arc-shaped bend as the outwardly convex segment; a vertical beam can be added on one side of the free end to form an L-shaped outwardly convex segment; or vertical beams can be added on both sides of the free end to form a T-shaped outwardly convex segment.

[0117] In the above structure, by providing the hook-shaped outwardly convex segment, the anti-peeling ability of the pulling part 2 and the connection strength with the blade root can be increased.

[0118] In some embodiments of the present application, the cross-sectional area of the outwardly convex segment is greater than that of the adjacent part of the pulling part 2.

[0119] In the extension direction of the pulling part 2, the pulling part 2 can be designed with a shape with a larger cross-sectional area, such as a spherical shape or an ellipsoidal shape, at the end where the free end is located to form an outwardly convex segment.

[0120] In the above structure, due to the larger cross-sectional area, the structural strength of the pulling part 2 is increased, and the connection strength of the pulling part 2 with the blade root is also increased.

[0121] In some embodiments of the present application, a part of the outwardly convex segment of the pulling part 2 can also be designed to be hook-shaped, and in the design, the cross-sectional area of the outwardly convex segment is increased, so that the cross-sectional area of the outwardly convex segment is greater than that of the adjacent part of the pulling part 2.

[0122] Please refer to Figure 10 to Figure 12 , Figure 10A longitudinal sectional view of a blade root assembly with a pre-embedded connecting structure provided in some embodiments of the present application; Figure 11 A longitudinal sectional view of a blade root assembly with a pre-embedded connecting structure provided in some embodiments of the present application; Figure 10 A local enlarged view at D; Figure 12 A longitudinal sectional view of a blade root assembly with a pre-embedded connecting structure provided in some embodiments of the present application.

[0123] Some embodiments of the present application provide a blade root assembly with a pre-embedded connecting structure. The blade root assembly with the pre-embedded connecting structure comprises a blade root body and a pre-embedded connecting structure. The blade root body comprises an outer wall 4, an inner wall 3, and a filler layer filled between the outer wall 4 and the inner wall 3. The pre-embedded connecting structure comprises a blade root pre-embedded part embedded in the filler layer; a sleeve body 1 of the blade root pre-embedded part is embedded in the filler layer, and a gripping part 2 of the blade root pre-embedded part is inserted into the outer wall 4 and / or the inner wall 3.

[0124] The blade root body is formed by resin infusion, and the pre-embedded connecting structure is embedded between the outer wall 4 and the inner wall 3 before infusion. After infusion, the filler layer is infused between the outer wall 4 and the inner wall 3, and the outer wall 4, the filler layer, the inner wall 3, and the pre-embedded connecting structure are formed integrally. When the pre-embedded connecting structure is pre-embedded, the free end of the gripping part 2 of the blade root pre-embedded part is inserted into the outer wall 4 and / or the inner wall 3, realizing the connection between the blade root pre-embedded part and the outer wall 4 and / or the inner wall 3 after forming.

[0125] In the above structure, the gripping part 2 is inserted into the woven gap position of the outer wall 4 and / or the inner wall 3, and only the fiber bundle of the fiber cloth is partially extruded away from the original position during the insertion process. After resin infusion and heating and curing, the gripping part 2 is tightly combined with the outer wall 4 and / or the inner wall 3, and then the blade root pre-embedded part can directly interact with the outer wall 4 and / or the inner wall 3, which can improve the pull-out bearing capacity of the blade root pre-embedded part and enhance the overall connection strength of the blade root assembly, meeting higher blade root connection load requirements.

[0126] As shown in FIGS. Figure 10 and Figure 12 In some embodiments of the present application, the thickness of the outer wall 4 is greater than the depth of the gripping part 2 inserted into the outer wall 4, and the difference (H) between the two is in the range of 0.5mm to 3.5mm, for example, the difference value can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, or any intermediate value between any two adjacent endpoint values; the thickness of the inner wall 3 is greater than the depth of the gripping part 2 inserted into the inner wall 3, and the difference between the two is in the range of 0.5mm to 3.5mm, for example, the difference value can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, or any intermediate value between any two adjacent endpoint values.

[0127] In the above structure, by setting the thickness of the outer wall 4 to be greater than the insertion depth of the pulling part 2, and the thickness of the inner wall 3 to be greater than the insertion depth of the pulling part 2, the pulling part 2 can be inserted into the inner wall 3 and / or the outer wall 4 without protruding from the surface of the inner wall 3 and / or the outer wall 4.

[0128] As shown in the drawings, in some embodiments of the present application, the difference between the thickness of the outer wall 4 and the depth of the pulling part 2 inserted into the outer wall 4 is 2mm; the difference between the thickness of the inner wall 3 and the depth of the pulling part 2 inserted into the inner wall 3 is 2mm. Figure 12 In the above structure, by further limiting the difference, not only can the reliability of the connection between the blade root embedded part and the outer wall 4 and the inner wall 3 be ensured, but also the producer can control the production to avoid the generation of defective products.

[0129] As shown in the drawings, in some embodiments of the present application, the embedded connection structure further comprises a wrapping layer 6 wrapped on the outer circumferential surface of the sleeve body 1, and the thickness of the wrapping layer 6 is less than the protruding height of the pulling part 2 on the sleeve body 1.

[0130] Figure 11 In the above structure, the wrapping layer 6 can be a fiber bundle wrapping layer. When the outer circumferential surface of the sleeve body 1 is a concave-convex surface, by wrapping the wrapping layer 6 and then pouring resin, the contact area of the sleeve body 1 and the filler layer of the blade root body can be increased, thereby improving the pull-out bearing capacity of the sleeve body 1.

[0131] As shown in the drawings, in some embodiments of the present application, the blade root body is circular, and the sleeve body 1 is a plurality of sleeve bodies 1 distributed along the circumference of the filler layer, which can provide a plurality of connection positions of the outer hub on the circumference of the blade root body, so that the blade root body is uniformly stressed when connected to the hub.

[0132] As shown in the drawings, in some embodiments of the present application, the embedded connection structure further comprises a filler block 7, and the filler block 7 is a plurality of filler blocks 7 distributed along the circumference of the filler layer, each filler block 7 is located between two sleeve bodies 1 and is attached to the sleeve body 1. During embedding, the sleeve body 1 can be fixed in position by the filler block 7 to ensure the accuracy of the embedded position and the connection strength after forming. The filler block 7 can be a UD block. Figure 12 As shown in the drawings, in some embodiments of the present application, the embedded connection structure further comprises a filler block 7, and the filler block 7 is a plurality of filler blocks 7 distributed along the circumference of the filler layer, each filler block 7 is located between two sleeve bodies 1 and is attached to the sleeve body 1. During embedding, the sleeve body 1 can be fixed in position by the filler block 7 to ensure the accuracy of the embedded position and the connection strength after forming. The filler block 7 can be a UD block.

[0133] Figure 12 As shown in the drawings, in some embodiments of the present application, the embedded connection structure further comprises a filler block 7, and the filler block 7 is a plurality of filler blocks 7 distributed along the circumference of the filler layer, each filler block 7 is located between two sleeve bodies 1 and is attached to the sleeve body 1. During embedding, the sleeve body 1 can be fixed in position by the filler block 7 to ensure the accuracy of the embedded position and the connection strength after forming. The filler block 7 can be a UD block.

[0134] As shown in the drawings, in some embodiments of the present application, the embedded connection structure further comprises a filler block 7, and the filler block 7 is a plurality of filler blocks 7 distributed along the circumference of the filler layer, each filler block 7 is located between two sleeve bodies 1 and is attached to the sleeve body 1. During embedding, the sleeve body 1 can be fixed in position by the filler block 7 to ensure the accuracy of the embedded position and the connection strength after forming. The filler block 7 can be a UD block. Figure 12 ​​As shown, when the filling block 7 is attached to the sleeve body 1, there is one filling block 7 on each side of the sleeve body 1, and the upper side of the sleeve body 1 is the inner wall 3, and the lower side of the sleeve body 1 is the outer wall 4. The area where the sleeve body 1 is attached to the left filling block 7 is a second curved surface area 11, and the area where the sleeve body 1 is attached to the right filling block 7 is another second curved surface area 11. Between the two filling blocks 7, the sleeve body 1 faces the inner wall 3, which is a first curved surface area 12, and between the two filling blocks 7, the sleeve body 1 faces the outer wall 4, which is another first curved surface area 12.

[0135] As shown in the drawings, Figure 10 In some embodiments of the present application, the embedded connection structure further comprises a wedge-shaped block 5, one end of which is inserted into the wedge-shaped area of the filler layer, and the other end abuts one end of the sleeve body 1, which can provide positioning for the sleeve body 1 in the axial direction of the sleeve body 1. Among them, the wedge-shaped block 5 can adopt a foam wedge-shaped block 5.

[0136] As shown in the drawings, Figure 10 In some embodiments of the present application, a sealing member is installed at the abutting position of the wedge-shaped block 5 and the sleeve body 1, and the sealing member comprises a sealing plug and a sealing ring, and the sealing ring is located between the sealing plug and the sleeve body 1.

[0137] In the above structure, a sealing plug is arranged between the wedge-shaped block 5 and the sleeve body 1, and the sealing plug can be threadedly connected with the sleeve body 1. A sealing ring is installed on the sealing plug, which can seal the gap between the sealing plug and the sleeve body 1, thereby avoiding the contamination of the inner cavity of the sleeve body 1 by the resin when pouring the resin.

[0138] Some embodiments of the present application also provide a production method of a blade root assembly with an embedded connection structure, comprising:

[0139] Assembling the sleeve body 1, the sealing ring, and the sealing plug to avoid the threaded part inside the sleeve body 1 from being infiltrated by the resin during vacuum resin pouring;

[0140] Sandblasting the surface of the sleeve body 1 to improve the roughness and cleanliness of the outer peripheral surface;

[0141] Winding the fiber bundle on the outer peripheral surface of the sleeve body 1 so that the fiber bundle winding layer is tightly attached to the gripping portion 2;

[0142] Laying the lower composite fiber cloth layer of the blade root assembly;

[0143] The filler block 7 is placed on the lower composite fiber cloth layer, the sleeve body 1 is placed between the two filler blocks 7, the first arc surface area 12 on the sleeve body 1 is adjusted to the gap position between the two filler blocks 7, and the pulling part 2 is inserted into the lower composite fiber cloth layer, and only the fiber bundle in the lower composite fiber cloth layer is partially extruded from the original position during the insertion process;

[0144] The wedge block 5 is placed at the end of the sleeve body 1, so as to complete the arrangement of the embedded connection structure;

[0145] The upper composite fiber cloth layer of the blade root assembly is laid on the embedded connection structure, and the pulling part 2 is inserted into the upper composite fiber cloth layer, and only the fiber bundle in the upper composite fiber cloth layer is partially extruded from the original position during the insertion process;

[0146] The resin and the curing agent are injected by using the vacuum infusion method, and are heated and cured to form a blade root assembly with an embedded connection structure.

[0147] Some embodiments of the present application also provide a blade, which comprises the blade root assembly with an embedded connection structure of any of the above embodiments.

[0148] The blade provided by the embodiments of the present application has all the beneficial effects of the blade root assembly with an embedded connection structure provided by the above embodiments of the present application, and specific descriptions can be made with reference to the specific descriptions of the blade root assembly with an embedded connection structure in the above embodiments, which will not be repeated here.

[0149] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A blade root pre-embedded component, characterized in that, include: The sleeve body has a first arc surface area and a second arc surface area on its outer peripheral surface; A gripping and pulling part is disposed in the first arc surface area of ​​the sleeve body, and the gripping and pulling part is formed by extending from the outer peripheral surface of the sleeve body in a direction away from the axis of the sleeve body. Multiple gripping and pulling parts are provided in the first arc-shaped area, and the multiple gripping and pulling parts are spaced apart.

2. The blade root embedded part according to claim 1, characterized in that, On the side of the sleeve body into which the bolt is inserted, the angle between the extending direction of the gripping part and the axis of the sleeve body is R; The value of R ranges from 30° to 90°.

3. The blade root embedded part according to claim 2, characterized in that, The value of R is 90°.

4. The blade root embedded part according to claim 1, characterized in that, There are two first arc-shaped areas, which are symmetrically distributed on the sleeve body; There are two second arc-shaped areas, which are symmetrically distributed on the sleeve body; The first arc surface region is located between the second arc surface regions, and the area of ​​the first arc surface region is smaller than the area of ​​the second arc surface region.

5. The blade root embedded part according to claim 4, characterized in that, The straight line extending from the gripping part intersects the axis of the sleeve body; and / or The straight line extending from the gripping part is not parallel to the axis of the sleeve body.

6. The blade root embedded part according to claim 5, characterized in that, The included angle between the multiple gripping and pulling parts within the same first arc surface area is 0°; The included angle between the gripping and pulling parts in the two first arc-shaped areas is 180°.

7. The blade root embedded part according to claim 1, characterized in that, Along the axial direction of the sleeve body, the outer peripheral surface of the sleeve body includes alternating concave and convex portions; Within the first arc-shaped area, the gripping part is located on the concave part and / or the convex part.

8. The blade root embedded part according to claim 7, characterized in that, Within the first arc-shaped area, the gripping part is located on the convex part.

9. The blade root embedded part according to claim 7, characterized in that, The distance between the free end of the gripping part located on the concave surface and the axis of the sleeve body is a; The distance between the free end of the gripping part located on the convex part and the axis of the sleeve body is b; The value of a is not greater than the value of b.

10. The blade root embedded part according to claim 9, characterized in that, The value of a is equal to the value of b.

11. The blade root embedded part according to claim 1, characterized in that, The gripping part is columnar and is integrally formed with the sleeve body and / or detachably connected; Along the extending direction of the gripping portion, the cross-sectional area of ​​the gripping portion gradually decreases; and / or The cross-sectional area of ​​the gripping and pulling part remains unchanged along its extension direction.

12. The blade root embedded part according to claim 11, characterized in that, The sleeve body and the gripping part are detachably connected by a threaded connection.

13. The blade root embedded part according to claim 1, characterized in that, At the end furthest from the sleeve body, the gripping part is provided with an outward protrusion; The protruding section is hook-shaped; and / or The cross-sectional area of ​​the convex section is greater than the cross-sectional area of ​​the adjacent part on the gripping section.

14. The blade root embedded part according to claim 13, characterized in that, The hook shape of the convex segment can be any of L-shaped, T-shaped, or J-shaped.

15. A leaf root assembly with a pre-embedded connection structure, characterized in that, include: The leaf base body includes an outer wall, an inner wall, and a filler layer, wherein the filler layer fills the space between the outer wall and the inner wall; The pre-embedded connection structure includes a blade root pre-embedded component as described in any one of claims 1 to 14, which is embedded in the filler layer; The sleeve body of the blade root pre-embedded component is pre-embedded in the filler layer, and the gripping and pulling part of the blade root pre-embedded component is inserted into the outer wall and / or the inner wall.

16. The blade root assembly with a pre-embedded connection structure according to claim 15, characterized in that, The thickness of the outer wall is greater than the depth to which the gripping part is inserted into the outer wall, and the difference between the two ranges from 0.5 mm to 3.5 mm. The thickness of the inner wall is greater than the depth to which the gripping part is inserted into the inner wall, and the difference between the two ranges from 0.5 mm to 3.5 mm.

17. The blade root assembly with a pre-embedded connection structure according to claim 16, characterized in that, The difference between the thickness of the outer wall and the depth to which the gripping part is inserted into the outer wall is 2 mm; the difference between the thickness of the inner wall and the depth to which the gripping part is inserted into the inner wall is 2 mm.

18. A blade, characterized in that, Includes the leaf root assembly with a pre-embedded connection structure as described in any one of claims 15 to 17.

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