Wind power blade

Abstract

The invention provides a wind power blade, and relates to the technical field of wind power blades. The wind power blade comprises a blade body and a main beam structural part, the blade body is provided with a main beam and a rear edge in the first direction, the blade body comprises a first blade section and a second blade section which are arranged in the second direction, and the main beam structural part is arranged on the main beam to connect the first blade section with the second blade section. According to the wind power blade, high testing frequency can be guaranteed in the fatigue testing process, and the verification period is shortened.

Description

Technical Field

[0001] The present application relates to the technical field of wind blades, and in particular to a wind blade. Background Art

[0002] Wind blades are the core components of wind turbines that convert natural wind energy into electrical energy. They are responsible for capturing wind energy and converting it into mechanical energy, which is then converted into electrical energy through generators. Wind blades are widely used in the global market, especially in the field of wind power generation. With the increasing global demand for renewable energy, wind power generation has developed rapidly as a clean and renewable energy form.

[0003] During fatigue testing of wind blades, the shortened position of the blades is limited by the post-static loading force and requires a sufficiently long lever arm to be retained, resulting in a lower test frequency and, in turn, a longer verification cycle. Summary of the invention

[0004] The purpose of the present application includes, for example, providing a wind blade that can ensure a higher test frequency and shorten the verification cycle during fatigue testing.

[0005] The embodiments of the present application can be implemented as follows:

[0006] An embodiment of the present application provides a wind blade, which includes a blade body and a main beam structure. The blade body has a main beam and a trailing edge along a first direction, and the blade body includes a first blade segment and a second blade segment arranged along a second direction. The main beam structure is arranged on the main beam to connect the first blade segment and the second blade segment, wherein the first direction and the second direction are perpendicular to each other.

[0007] Optionally, the main beam structure includes a first fixing plate, a second fixing plate, a support assembly and a main beam fastener, the support assembly is arranged inside the blade body, the first fixing plate and the second fixing plate are relatively arranged on both sides of the main beam along a third direction, the first fixing plate, the second fixing plate, the support assembly and the first blade segment are connected via the main beam fastener, and the first fixing plate, the second fixing plate, the support assembly and the second blade segment are connected via the main beam fastener, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0008] Optionally, the support assembly includes two pressure plates connected to a support plate between the two pressure plates, the two pressure plates are respectively close to the first fixed plate and the second fixed plate, the two pressure plates are both abutted against the inner wall of the blade body, the first fixed plate, the second fixed plate, the pressure plate and the first blade segment are connected through the main beam fastener, and the first fixed plate, the second fixed plate, the pressure plate and the second blade segment are connected through the main beam fastener.

[0009] Optionally, the main beam fastener includes a plurality of main beam bolts, a portion of which passes through the first fixing plate, the second fixing plate, the first blade segment and the two pressure plates, and another portion of the main beam bolts passes through the first fixing plate, the second fixing plate, the second blade segment and the two pressure plates.

[0010] Optionally, a web made of fiberglass is further provided in the blade body, and a notch for the web to be inserted into is provided on the pressure plate.

[0011] Optionally, the pressure plate and the support plate are both made of steel.

[0012] Optionally, the wind blade further includes a trailing edge structure, wherein the trailing edge structure is arranged at the trailing edge to connect the first blade segment and the second blade segment.

[0013] Optionally, the trailing edge structural member includes a fixing block and a trailing edge fastener, wherein the fixing block is disposed at the trailing edge, and the fixing block is simultaneously connected to the first blade segment and the second blade segment via the trailing edge fastener.

[0014] Optionally, the fixing block includes a first fixing portion, a second fixing portion and a connecting portion, the first fixing portion and the second fixing portion are relatively arranged on both sides of the trailing edge along a third direction, the connecting portion is connected between the first fixing portion and the second fixing portion, the first fixing portion, the second fixing portion and the first blade segment are connected via the trailing edge fastener, and the first fixing portion, the second fixing portion and the second blade segment are connected via the trailing edge fastener, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0015] Optionally, the trailing edge fastener includes a plurality of trailing edge bolts, wherein a portion of the trailing edge bolts pass through the first fixing portion, the second fixing portion and the first blade segment, and another portion of the trailing edge bolts pass through the first fixing portion, the second fixing portion and the second blade segment.

[0016] The beneficial effects of the wind blade provided by the embodiment of the present application include, for example: in order to ensure a high test frequency and shorten the verification cycle during fatigue testing, a wind blade is designed, the wind blade includes a blade body and a main beam structure, the blade body has a main beam and a trailing edge along a first direction, the blade body includes a first blade segment and a second blade segment arranged along a second direction, and the main beam structure is arranged on the main beam to connect the first blade segment and the second blade segment. When fatigue testing is required, the main beam structure is removed so that the blade body is disconnected at the optimal truncation position of the fatigue test and is divided into an independent first blade segment and a second blade segment. At this time, fatigue testing of the second blade segment can ensure a high test frequency, thereby shortening the verification cycle. During the post-static load test, the first blade segment and the second blade segment can be connected by the main beam structure, and the truncation position of the blade body is not limited by the post-static load force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a wind blade in an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of a first viewing angle of a support assembly in an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of a second viewing angle of the support assembly in an embodiment of the present application.

[0021] Icons: 100-blade body; 110-main beam; 120-trailing edge; 130-first blade segment; 140-second blade segment; 200-main beam structural member; 210-first fixing plate; 220-second fixing plate; 230-support assembly; 231-pressure plate; 2311-notch; 232-support plate; 300-trailing edge structural member; 310-fixing block; 311-first fixing part; 312-second fixing part; 313-connecting part. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0027] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0028] The inventor of the present application found that during fatigue testing of wind blades, the shortened position of the blades is limited by the post-static loading force and needs to retain a sufficiently long lever arm, resulting in a low test frequency and a long verification cycle. The embodiments of the present application provide a wind blade that can at least solve the above technical problems.

[0029] Please refer to Figure 1-Figure 3The wind blade provided by the embodiment of the present application includes a blade body 100 and a main beam structure 200, the blade body 100 has a main beam 110 and a trailing edge 120 along a first direction x, the blade body 100 includes a first blade segment 130 and a second blade segment 140 arranged along a second direction y, the main beam structure 200 is arranged on the main beam 110 to connect the first blade segment 130 and the second blade segment 140, wherein the first direction x and the second direction y are perpendicular to each other.

[0030] It should be noted that, in the second direction y, the blade body 100 has a blade tip and a blade root, the first blade segment 130 and the second blade segment 140 are arranged in the direction from the blade tip to the blade root, the first blade segment 130 and the second blade segment 140 are two truncated parts of the blade body 100, and the truncation position of the blade body 100 can be selected as the optimal truncation position for fatigue testing, for example, the truncation position of the blade body 100 is in the front 10%, front 20%, front 30% or front 40% in the direction from the blade tip to the blade root.

[0031] When fatigue testing is required, the main beam structure 200 is removed, so that the blade body 100 is disconnected at the optimal truncation position for fatigue testing and divided into an independent first blade segment 130 and a second blade segment 140. At this time, fatigue testing of the second blade segment 140 can ensure a higher test frequency, thereby shortening the verification cycle. During the post-static load test, the first blade segment 130 and the second blade segment 140 can be connected through the main beam structure 200, and the truncation position of the blade body 100 is not limited by the post-static load force.

[0032] In some embodiments, the main beam structure 200 includes a first fixed plate 210, a second fixed plate 220, a support assembly 230 and a main beam fastener, the support assembly 230 is arranged inside the blade body 100, the first fixed plate 210 and the second fixed plate 220 are relatively arranged on both sides of the main beam 110 along the third direction z, the first fixed plate 210, the second fixed plate 220, the support assembly 230 and the first blade segment 130 are connected by the main beam fastener, and the first fixed plate 210, the second fixed plate 220, the support assembly 230 and the second blade segment 140 are connected by the main beam fastener, wherein the first direction x, the second direction y and the third direction z are perpendicular to each other.

[0033] The interior of the blade body 100 is hollow, and the support assembly 230 is arranged inside the blade body 100 to support the blade body 100; the first fixing plate 210 and the second fixing plate 220 are relatively arranged on the upper and lower sides of the main beam 110, and are both located on the outside of the blade body 100; the main beam fasteners connect and fix the first fixing plate 210, the second fixing plate 220, the support assembly 230 and the first blade segment 130, and the main beam fasteners connect and fix the first fixing plate 210, the second fixing plate 220, the support assembly 230 and the second blade segment 140, so that the first blade segment 130 and the second blade segment 140 are relatively fixed.

[0034] In some embodiments, the support assembly 230 includes two pressure plates 231 and a support plate 232 connected between the two pressure plates 231, the two pressure plates 231 are respectively close to the first fixing plate 210 and the second fixing plate 220, the two pressure plates 231 are both abutted against the inner wall of the blade body 100, the first fixing plate 210, the second fixing plate 220, the pressure plate 231 and the first blade segment 130 are connected by main beam fasteners, and the first fixing plate 210, the second fixing plate 220, the pressure plate 231 and the second blade segment 140 are connected by main beam fasteners.

[0035] The two pressure plates 231 are matched with the positions of the first fixed plate 210 and the second fixed plate 220 respectively, and the main beam fasteners penetrate the first fixed plate 210, the second fixed plate 220, the two pressure plates 231 and the first blade segment 130 at the same time, and the main beam fasteners penetrate the first fixed plate 210, the second fixed plate 220, the two pressure plates 231 and the second blade segment 140 at the same time. The two pressure plates 231 jointly bear the positive pressure, and the two pressure plates 231 and the support plate 232 connected between the two pressure plates 231 jointly play the effect of supporting and reinforcing the blade body 100.

[0036] It should be noted that the number of the support plates 232 connected between the two pressure plates 231 can be two or more, and there is no limitation on this. In order to adapt to the internal structure of the blade body 100, the support plate 232 can be set at an angle relative to the pressure plate 231, for example, the angle between the support plate 232 and the pressure plate 231 is 90°-95°.

[0037] The contour lines of the main beam 110 of multiple test blades of different models are basically the same. The first fixed plate 210, the second fixed plate 220 and the two pressure plates 231 are all adapted to the contour line of the main beam 110, so that the main beam structure 200 can be reused and adapted to multiple test blades, thereby shortening the installation period and saving costs.

[0038] In some embodiments, the main beam fastener includes a plurality of main beam bolts, a portion of which passes through the first fixing plate 210, the second fixing plate 220, the first blade segment 130 and the pressure plate 231, and another portion of the main beam bolts passes through the first fixing plate 210, the second fixing plate 220, the second blade segment 140 and the pressure plate 231.

[0039] Optionally, there are two support assemblies 230 , and the two support assemblies 230 are respectively located inside the first blade segment 130 and the second blade segment 140 . The two support assemblies 230 are independent components and can be easily installed in the first blade segment 130 and the second blade segment 140 .

[0040] Multiple main beam bolts are evenly spaced and distributed, and a plurality of through holes corresponding to the main beam bolts are opened on the pressure plate 231, wherein a part of the main beam bolts simultaneously penetrate the first fixing plate 210, the second fixing plate 220, the first blade segment 130 and the two pressure plates 231 in the support assembly 230 of the first blade segment 130, and another part of the main beam bolts simultaneously penetrate the first fixing plate 210, the second fixing plate 220, the second blade segment 140 and the two pressure plates 231 in the support assembly 230 of the second blade segment 140, thereby making the first blade segment 130 and the second blade segment 140 relatively fixed at the parts located on the main beam 110, so as to transfer the main load from the blade root to the blade tip.

[0041] In some embodiments, a web made of fiberglass is further provided in the blade body 100, and a notch 2311 for the web to be inserted is provided on the pressure plate 231. The pressure plate 231 and the support plate 232 are both made of steel, which can resist the pre-tightening force of the main beam bolts, and can meet the use requirements by using traditional and mature metal processing technology, which has universal applicability.

[0042] It should be noted that FRP is a composite material composed of glass fiber and resin. The existing blades are filled with FRP. In this embodiment, part of the FRP is replaced by a support assembly 230 composed of a pressure plate 231 and a support plate 232. The support assembly 230 composed of the pressure plate 231 and the support plate 232 is made of steel. Compared with FRP, the structural strength of the main beam 110 is improved. The notch 2311 is opened on the pressure plate 231 for the web retained in the blade body 100 to be inserted, so that there is an overlapping part between the web and the support assembly 230, so that the shear force on the web can be smoothly transmitted.

[0043] It is understandable that the pressure plate 231 and the support plate 232 may also be made of other materials as long as the structural strength of the main beam 110 can be improved compared to fiberglass reinforced plastics.

[0044] In some embodiments, the wind blade further includes a trailing edge structure 300 , which is disposed at the trailing edge 120 to connect the first blade segment 130 and the second blade segment 140 .

[0045] By disposing a trailing edge structure 300 at the trailing edge 120 of the blade body 100 , the trailing edge structure 300 cooperates with the main beam structure 200 to connect the first blade segment 130 and the second blade segment 140 , so that the connection between the first blade segment 130 and the second blade segment 140 is more stable.

[0046] In some embodiments, the trailing edge structure 300 includes a fixing block 310 and a trailing edge fastener. The fixing block 310 is disposed at the trailing edge 120 , and the fixing block 310 is connected to both the first blade segment 130 and the second blade segment 140 via the trailing edge fastener.

[0047] By disposing the fixing block 310 at the trailing edge 120 and connecting the fixing block 310 to the first blade segment 130 and the second blade segment 140 at the same time through the trailing edge fastener, the connection between the first blade segment 130 and the second blade segment 140 is made more stable.

[0048] In some embodiments, the fixing block 310 includes a first fixing portion 311, a second fixing portion 312 and a connecting portion 313. The first fixing portion 311 and the second fixing portion 312 are relatively arranged on both sides of the trailing edge 120 along the third direction z. The connecting portion 313 is connected between the first fixing portion 311 and the second fixing portion 312. The first fixing portion 311, the second fixing portion 312 and the first blade segment 130 are connected by a trailing edge fastener, and the first fixing portion 311, the second fixing portion 312 and the second blade segment 140 are connected by a trailing edge fastener.

[0049] The first fixing portion 311 and the second fixing portion 312 are arranged on the upper and lower sides of the trailing edge 120, and the connecting portion 313 is connected between the first fixing portion 311 and the second fixing portion 312, so that the first fixing portion 311, the second fixing portion 312 and the connecting portion 313 are roughly C-shaped as a whole, and the trailing edge fastener passes through the first fixing portion 311, the second fixing portion 312 and the first blade segment 130 at the same time, and the trailing edge fastener passes through the first fixing portion 311, the second fixing portion 312 and the second blade segment 140 at the same time, so as to fix the fixing block 310 to the trailing edge 120, thereby connecting the first blade segment 130 and the second blade segment 140.

[0050] The opposing surfaces of the first fixing portion 311 and the second fixing portion 312 match the upper and lower surfaces of the trailing edge 120 , so that the first fixing portion 311 and the second fixing portion 312 can better fit the trailing edge 120 and better transfer the main load from the blade root to the blade tip.

[0051] In some embodiments, the trailing edge fastener includes a plurality of trailing edge bolts, some of which pass through the first fixing portion 311 , the second fixing portion 312 and the first blade segment 130 , and another portion of the trailing edge bolts pass through the first fixing portion 311 , the second fixing portion 312 and the second blade segment 140 .

[0052] Multiple trailing edge bolts are evenly spaced, with a portion of the trailing edge bolts simultaneously penetrating the first fixing portion 311, the second fixing portion 312 and the first blade segment 130, and another portion of the trailing edge bolts simultaneously penetrating the first fixing portion 311, the second fixing portion 312 and the second blade segment 140, thereby making the first blade segment 130 and the second blade segment 140 relatively fixed at the trailing edge 120, so as to transfer the main load from the blade root to the blade tip.

[0053] In addition, in order to meet the requirements of the whole machine power generation, expand the efficiency of wind energy utilization, and tap the potential of low wind speed wind farms, the length of existing blades is designed to be longer and longer, which leads to difficulties in transportation. The embodiment of the present application divides the blade body 100 into a first blade segment 130 and a second blade segment 140. If the length of the first blade segment 130 and the second blade segment 140 is convenient for transportation, the first blade segment 130 and the second blade segment 140 are transported separately during transportation, reducing the rail bending radius of the upper and lower ramps, and solving the transportation problem of the test blade from the blade factory to the test platform; if the length of the second blade segment 140 is too long, the second blade segment 140 can be further cut off to make it easy to transport.

[0054] The working principle of the wind blade provided in the embodiment of the present application includes at least: by arranging a main beam structure 200 and a trailing edge structure 300 on the blade body 100, the main bending moment and the accompanying load are borne, so that the loading bending moment of the first blade segment 130 can be smoothly transmitted to the second blade segment 140; by bolting through and connecting the first fixing plate 210 and the second fixing plate 220 to generate positive pressure, a pair of friction couples are generated between the fixing plates and the blade body 100, and the friction couples generate a reaction bending moment around the center axis of the airfoil to balance the bending moment brought about during the test.

[0055] In the field of accelerated verification of fatigue testing, the original fatigue test required the blade to be shortened. The shortened position of the blade was limited by the post-static load force and needed to retain a sufficiently long lever arm. The shortened position of the blade was often selected at the last loading point during the post-static load test. When the load coverage was met, the test frequency was not optimal due to the limitation of the shortened position of the blade. For example, taking a blade with a length of 100 meters as an example, when the load coverage was met, the flapping frequency was 0.265Hz and the swing frequency was 0.544Hz. The wind blade in this embodiment includes a truncated first blade segment 130 and a second blade segment 140, and the first blade segment 130 and the second blade segment 140 are connected by a main beam structure 200 and a trailing edge structure 300. The wind blade is no longer restricted by the post-static load test, and a blade truncation position closer to the blade root can be selected to increase the flapping frequency and the swing frequency. For example, the flapping frequency is increased to 0.473 Hz, and the swing frequency is increased to 0.832 Hz, which is an increase of 78.5% compared to the original. The fatigue test time is effectively shortened, type certification is obtained in advance, and the timely delivery of the product is ensured. In addition, the occupancy of the test platform can be reduced, and the expenditure on testing costs can be reduced.

[0056] In the field of post-static load testing, since the loading arm is shortened after the blade is shortened, the single-point maximum loading force increases when the post-static load test reaches the same bending moment, which can easily cause a new failure mode. Therefore, the wind blade in this embodiment connects the first blade segment 130 and the second blade segment 140 through the main beam structure 200 and the trailing edge structure 300 after the fatigue test. During the post-static load test, a longer loading arm can be guaranteed, and the loading force is normal when the same bending moment is reached, and failure is not likely to occur.

[0057] In summary, an embodiment of the present application provides a wind blade, including a blade body 100, a main beam structural member 200 and a trailing edge structural member 300. The main beam structural member 200 is arranged at the main beam 110 of the blade body 100 to connect the first blade segment 130 and the second blade segment 140, and the trailing edge structural member 300 is arranged at the trailing edge 120 of the blade body 100 to connect the first blade segment 130 and the second blade segment 140. The wind blade can ensure a higher test frequency and shorten the verification cycle during the fatigue test. During the post-static load test, the first blade segment 130 and the second blade segment 140 can be connected by the main beam structural member 200 and the trailing edge structural member 300, and the truncation position of the blade body 100 is not limited by the post-static load force.

[0058] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A wind blade, characterized in that: The invention comprises a blade body (100) and a main beam structure (200), wherein the blade body (100) has a main beam (110) and a trailing edge (120) along a first direction, and the blade body (100) comprises a first blade segment (130) and a second blade segment (140) arranged along a second direction, and the main beam structure (200) is arranged on the main beam (110) to connect the first blade segment (130) and the second blade segment (140), wherein the first direction and the second direction are perpendicular to each other.

2. The wind blade according to claim 1, characterized in that: The main beam structure (200) comprises a first fixing plate (210), a second fixing plate (220), a support assembly (230) and a main beam fastener, wherein the support assembly (230) is arranged inside the blade body (100), the first fixing plate (210) and the second fixing plate (220) are relatively arranged on both sides of the main beam (110) along a third direction, the first fixing plate (210), the second fixing plate (220), the support assembly (230) and the first blade segment (130) are connected via the main beam fastener, and the first fixing plate (210), the second fixing plate (220), the support assembly (230) and the second blade segment (140) are connected via the main beam fastener, wherein the first direction, the second direction and the third direction are perpendicular to each other.

3. The wind blade according to claim 2, characterized in that: The support assembly (230) includes two pressure plates (231) and a support plate (232) connected between the two pressure plates (231), the two pressure plates (231) are respectively close to the first fixing plate (210) and the second fixing plate (220), the two pressure plates (231) are both in contact with the inner wall of the blade body (100), the first fixing plate (210), the second fixing plate (220), the pressure plate (231) and the first blade segment (130) are connected via the main beam fastener, and the first fixing plate (210), the second fixing plate (220), the pressure plate (231) and the second blade segment (140) are connected via the main beam fastener.

4. The wind blade according to claim 3, characterized in that: The main beam fastener comprises a plurality of main beam bolts, wherein a portion of the main beam bolts pass through the first fixing plate (210), the second fixing plate (220), the first blade segment (130) and the pressure plate (231), and another portion of the main beam bolts pass through the first fixing plate (210), the second fixing plate (220), the second blade segment (140) and the pressure plate (231).

5. The wind blade according to claim 3, characterized in that: A web plate made of glass fiber reinforced plastic is also provided in the blade body (100), and a notch (2311) for the web plate to be inserted into is provided on the pressure plate (231).

6. The wind blade according to claim 3, characterized in that: The pressure plate (231) and the support plate (232) are both made of steel.

7. The wind blade according to claim 1, characterized in that: The wind blade further comprises a trailing edge structural member (300), wherein the trailing edge structural member (300) is arranged at the trailing edge (120) to connect the first blade segment (130) and the second blade segment (140).

8. The wind blade according to claim 7, characterized in that: The trailing edge structural member (300) comprises a fixing block (310) and a trailing edge fastener, wherein the fixing block (310) is arranged on the trailing edge (120), and the fixing block (310) is simultaneously connected to the first blade segment (130) and the second blade segment (140) via the trailing edge fastener.

9. The wind blade according to claim 8, characterized in that: The fixing block (310) comprises a first fixing portion (311), a second fixing portion (312) and a connecting portion (313), wherein the first fixing portion (311) and the second fixing portion (312) are relatively arranged on both sides of the trailing edge (120) along a third direction, and the connecting portion (313) is connected between the first fixing portion (311) and the second fixing portion (312), and the first fixing portion (311), the second fixing portion (312) and the first blade segment (130) are connected via the trailing edge fastener, and the first fixing portion (311), the second fixing portion (312) and the second blade segment (140) are connected via the trailing edge fastener, wherein the first direction, the second direction and the third direction are perpendicular to each other.

10. The wind blade according to claim 9, characterized in that: The trailing edge fastener includes a plurality of trailing edge bolts, wherein a portion of the trailing edge bolts pass through the first fixing portion (311), the second fixing portion (312) and the first blade segment (130), and another portion of the trailing edge bolts pass through the first fixing portion (311), the second fixing portion (312) and the second blade segment (140).

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