JP2017207001A - Wind turbine blade, wind turbine, process of manufacture for wind turbine blade and wind turbine blade connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve breaking strength and durability of a connected wind turbine blade.SOLUTION: This invention relates to a wind turbine blade having each of several blade divided outer contour bodies 7A, 7B adhered and connected at its end part by adhesive material portions 80, 90. Ribs 8, 9 extending to a divided outer contour side for a second blade over the end part are arranged in at least one first blade divided outer contour body of the first blade divided outer contour body 7A and the second blade divided outer contour body 7B that are adhered and connected. The prescribed ribs are adhered and connected by an adhering material part 17 to at least inside the second blade divided outer contour body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technology for a wind turbine blade of a wind turbine generator.

  In a wind turbine generator equipped with a propeller-type windmill, a plurality of blades radially attached to the hub constitute a windmill, and each blade generates a load in the rotation direction with respect to the incoming wind, whereby the windmill rotates. It is a mechanism to do. The blades each have a wing-shaped cross section perpendicular to the longitudinal direction. Many blades used in wind power generators are made of FRP (Fiber Reinforced Plastics). FRP is reinforced with glass fiber, for example, and is used in many fields because of its excellent specific strength and specific rigidity.

  The blade is generally manufactured in two parts, upper and lower, for manufacturing reasons, and they are often integrated by bonding to form a finished product. After all, it can be said that the strength and durability of the blade depend on the bonding technique and the strength of the bonded portion.

As shown in FIG. 5, the conventional bonding is performed by bonding and hardening an adhesive at two locations, a TE (trailing edge; hereinafter referred to as TE) side and a LE (leading edge; hereinafter referred to as LE) side. In particular, the TE side has a thick adhesive layer cross section. Since this adhesive layer is a single resin having no reinforcement such as a glass substrate, the fatigue strength is lower than that of FRP, which may cause a problem in durability.
The failure mode when an external force is applied to the bonded portion can be broadly divided into separation failure and shear failure. The delamination fracture is a form in which the bonded portion is peeled off, and therefore its destructive resistance is very small. On the other hand, in the case of shear fracture, since the original strength of the adhesive is exhibited, its fracture resistance is large. Therefore, in general, the adhesive structure is designed to support the external force by shearing.

  A metal lightning plate for lightning is disposed at the tip of the blade, and this is also often attached by bonding. Since the tip of the blade is a portion to which such an important member is attached, the reliability of the bonding technique of the member is particularly required. However, since the blade is repeatedly bent over a long period of time and may receive lightning strikes, there are many cases in which the bonded portion is broken. If the blades are severely damaged, there is a major problem that the wind power plant will be shut down for a long time because it will be a major repair.

  Furthermore, as an example of damage when the tip of the blade is subjected to a lightning stroke, this TE-side peeling fracture is the most common. Blade damage due to lightning strikes is thought to be due to increased internal pressure. As shown in FIG. 6, when the internal pressure rises, the blade is deformed to open, so that a force for peeling is applied to the adhesive portions at both ends. Since the resistance of the peeling when the bonded portion is broken is the smallest, the TE side peeling failure is the most common example of damage when the blade tip is subjected to lightning strike. Since the tip of the blade is a narrow place where there is no space for a person to enter, it cannot be reinforced even if it is weak, for example, after being integrated by bonding.

  Conventionally, a blade having a truss support structure has been proposed for the purpose of obtaining a lighter and more robust blade (see Patent Document 1). This blade has a truss support structure assembly of composite truss joints, the truss support structure is covered by lightweight glass fiber or hardened fabric skin, which forms the wing structure Attached and fitted to each rib panel edge.

Special table 2010-522307

However, the following problems remain in the prior art described above.
1) Although a truss structure is pursued to reduce weight and toughness, it is unsuitable for mass production because of its many components and a complicated structure, resulting in high costs.
2) If damaged, repair on site is difficult.

  The present invention has been made against the background of the above circumstances, and it is possible to improve the durability of the blade without requiring a complicated configuration and to minimize the blade damage when subjected to lightning strike. An object of the present invention is to provide a windmill, a method for manufacturing a blade for a windmill, and a blade joining structure for a windmill.

  In other words, among the wind turbine blades of the present invention, the first embodiment is a wind turbine blade in which a plurality of blade outer shells are bonded and bonded to each other by an adhesive material portion, and bonded and bonded. Extends inside the first blade split outer body of at least one of the first blade split outer body and the second blade split outer body beyond the end and toward the second blade split outer body side. A rib is provided, and the rib is bonded to at least the inside of the second blade divided outer body by an adhesive portion.

  In another aspect of the invention of the wind turbine blade, in the present invention of the above aspect, the first blade divided outer body and the second blade divided outer body are joined at a leading edge and a leading edge. It is characterized by having at each edge.

  Another aspect of the invention of the blade for a wind turbine according to the present invention of the above aspect is characterized in that the rib is along the longitudinal direction of the end portion.

  In another aspect of the invention of the wind turbine blade, in the present invention of the above aspect, the rib surface of the rib is in the peeling direction of the first blade divided outer body and the second blade divided outer body to which they are bonded. It is located along.

  Another aspect of the invention of a wind turbine blade is characterized in that, in the present invention of the above aspect, the rib is provided in a range within 2 m from the tip of the wind turbine blade.

  In another aspect of the invention of the blade for a wind turbine, in the present invention of the above-described embodiment, the rib is a first rib, the second blade is divided into the outer shell, and the first blade is used beyond the end. A second rib extending toward the divided outer body is provided, and the second rib is bonded to at least the first blade outer shell by an adhesive portion.

  In another aspect of the invention of the wind turbine blade, in the present invention of the above aspect, the first rib and the second rib are arranged side by side, and the first rib is used for the second blade. The adhesive material portion that joins the divided outer body and the adhesive material portion that joins the second rib to the first blade divided outer body are formed of the same adhesive material portion.

  Another aspect of the invention of the wind turbine blade is characterized in that, in the present invention of the above aspect, the second rib is provided in a range within 2 m from the tip of the wind turbine blade.

  Another aspect of the invention of the wind turbine blade is characterized in that, in the present invention of the above aspect, a lightning-receiving portion is provided on the tip side of the wind turbine blade.

  A windmill according to the present invention includes the windmill blade according to any one of the above embodiments.

Among the methods for manufacturing a wind turbine blade according to the present invention, the first embodiment is a method for manufacturing a wind turbine blade in which a plurality of blade outer shells are bonded and bonded to each other by an adhesive.
At least one of the first blade divided outer body and the second blade divided outer body to be adhesively bonded to each other inside the first blade divided outer body beyond the end portion, the second blade divided outer body. A rib that extends on the outer body side is provided,
When the first blade divided outer body and the second blade divided outer body are bonded and bonded, the rib is bonded to at least the second blade divided outer body with an adhesive. To do.

  Another aspect of the invention of a method for manufacturing a blade for a wind turbine according to the present invention of the above aspect includes a step of fixing the rib to the first blade outer shell.

According to another aspect of the invention of a method for manufacturing a wind turbine blade, in the present invention of the above aspect, the first rib is used as the first rib, and the first blade extends beyond the end portion inside the second blade split outer body. A second rib extending on the blade split outer body side is provided,
When the first blade divided outer body and the second blade divided outer body are bonded and bonded, the second rib is bonded to at least the first blade divided outer wall with an adhesive. It is characterized by.

The wind turbine blade joining structure of the present invention is a wind turbine blade joining structure in which a plurality of blade split outer bodies are bonded and joined by adhesive members at their respective ends,
At least one of the first blade divided outer body and the second blade divided outer body to be adhesively bonded to each other inside the first blade divided outer body beyond the end portion, the second blade divided outer body. A rib extending on the outer body side is provided, and the rib is joined to at least the inside of the second blade outer shell by an adhesive member.

  As described above, according to the present invention, in the joining of the end portions by the adhesive material portion, the conventional fracture failure with a small load resistance is changed to the shear failure with a large load resistance by interposing the joint provided with the rib. It becomes possible. Therefore, the durability against repeated bending is improved and the structure can withstand higher internal pressures. Therefore, even if there is a lightning strike at the blade tip, it is less likely to break, and the damage can be kept to a minimum. There is an effect that can be done.

It is a figure which shows the outline of the windmill in one Embodiment of this invention. Similarly, it is the schematic which shows a part of blade for blades. Similarly, it is sectional drawing which shows the joining process of the braid | blade for windmills. It is a figure explaining the test piece used by the Example and comparative example of this invention. It is sectional drawing which shows the joining process of the conventional blade for blades. It is a figure explaining the fracture | rupture situation in the conventional blade for blades.

A windmill and a blade for a windmill according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a wind turbine 1 of a wind turbine generator having a wind turbine blade according to the present embodiment includes a rotor hub 2 that is rotatably supported, and a plurality of actual implementations that are radially attached to the rotor hub 2. And a wind turbine blade 3 of the form. Although FIG. 1 shows a configuration in which three windmill blades 3 are attached to the rotor hub 2, the number of windmill blades is not particularly limited in the present invention.

Each wind turbine blade 3 includes a blade body 4 having a wing shape and a lightning receiving portion 20 provided on the tip side thereof.
The blade body 4 is made of, for example, FRP, and a leading edge 5 (front edge) and a trailing edge 6 (rear edge) are located at both edges along the longitudinal direction of the blade body 4.

As shown in FIG. 3, the blade body 4 has a suction side blade surface wall 7A constituting the suction surface side blade surface wall and a pressure side blade surface wall 7B constituting the pressure surface side blade surface wall joined to each other. It has a wing shape.
The negative pressure side blade surface wall 7A and the positive pressure side blade surface wall 7B correspond to the divided outer body for blades of the present invention. One of them is a first blade divided outer body, and the other is a second blade divided outer body. In this embodiment, the suction side blade surface wall 7A is a first blade divided outer body, and the pressure side blade surface wall 7B is a second blade divided outer body.
In this embodiment, the blade split outer body has been described as having two blade surface walls. However, the number and position of the blade outer shell are not particularly limited. Even those other than the leading edge are within the scope of the present invention.

As shown in FIGS. 1 and 2, a lightning receiving portion 20 made of a conductive material such as metal is connected to the tip of the blade body 4. The lightning receiving portion 20 has a flat shape that is continuous with the outer surface of the blade body 4, has a tapered shape that is narrower toward the tip side and smaller in thickness, and the tip has a small-diameter curved shape. You can also The lightning receiver 20 and the blade body 4 are joined with their surfaces flush.
Note that a grounding copper cable 21 is connected to the lightning receiving part 20 and is arranged up to the root part of the blade and grounded in the ground.

On the trailing edge 6 side, a rib 8 is fixed to the inner surface of the suction side blade surface wall 7A, and a rib 9 is fixed to the inner surface of the pressure side blade surface wall 7B. In this example, the rib 8 corresponds to the first rib, and the rib 9 corresponds to the second rib.
Further, at the end close to the lightning receiving portion 20, the rib 10 is fixed to the inner surface of the suction side blade surface wall 7A, and the rib 11 is fixed to the inner surface of the pressure side blade surface wall 7B.
Each rib can be made of FRP. As the resin, epoxy or unsaturated polyester is used. The reinforcing substrate may be glass fiber or carbon fiber, and a commercially available reinforcing substrate such as glass cloth can be used. The thickness of the rib is preferably in the range of 2 to 3 mm in order to minimize the increase in mass.

  The rib 8 is connected to the inner surface of the suction side blade surface wall 7A with a rib adhesive piece 8A fixed by an adhesive member 80 along the trailing edge 6, and the end of the rib adhesive piece 8A on the trailing edge 6 side is connected. Ribs 8 stand up from the part. The rib 8 has an angle toward the inner surface of the pressure side blade surface wall 7B when the pressure side blade surface wall 7B is joined, and the tip of the rib 8 is the end of the suction side blade surface wall 7A and the pressure side blade surface wall 7B. It is located on the pressure side blade surface wall 7B side beyond the trailing edge 6 which is a portion. The rib 8 is bonded to the inner surface of the suction side blade surface wall 7A in advance by the adhesive portion 80 via the rib adhesive piece 8A before the suction side blade surface wall 7A and the pressure side blade surface wall 7B are bonded. desirable. The rib 8 only needs to be fixed to the suction side blade surface wall 7A. The rib 8 is formed integrally with the suction side blade surface wall 7A, or other means such as a bolt or nut mechanically. It may be fixed.

  The rib 9 is connected to the inner surface of the pressure side blade surface wall 7B with a rib adhesive piece 9A fixed by an adhesive material portion 90 along the trailing edge 6, and the rib adhesive piece 9A has a trailing edge 6 side. Ribs 9 stand up from the ends of the. The rib 9 has an angle toward the inner surface of the pressure side blade surface wall 7A when the suction side blade surface wall 7A is joined, and the tip of the rib 9 is the end of the suction side blade surface wall 7A and the pressure side blade surface wall 7B. It is located on the negative pressure side blade surface wall 7A side beyond the trailing edge 6 which is a portion. The rib 9 is preferably bonded to the inner surface of the pressure side blade surface wall 7B by the adhesive member 90 via the rib bonding piece 9A in advance before bonding the suction side blade surface wall 7A and the pressure side blade surface wall 7B. . The rib 9 only needs to be fixed to the pressure side blade surface wall 7B. The rib 9 may be formed integrally with the pressure side blade surface wall 7B, or other means such as a bolt or nut mechanically. It may be fixed.

  The rib 8 and the rib 9 have a gap in the width direction of the blade when the suction side blade surface wall 7a and the pressure side blade surface wall 7b are joined, and the rib surfaces are aligned along the longitudinal direction of the blade. doing. The gap between the rib 8 and the rib 9 is not particularly limited, but may be in the range of 0.5 to 50 mm, for example.

  The rib 10 is connected to the inner surface of the suction side blade surface wall 7A by a rib adhesive piece 10A fixed by an adhesive portion along an end connected to the lightning receiving portion 20, and the longitudinal direction of the blade The rib 10 rises from the end of the rib adhesive piece 10A on the inner side. The rib 10 has an angle toward the inner surface of the pressure side blade surface wall 7B when the pressure side blade surface wall 7B is joined, and the tip of the rib 10 has a suction side blade surface wall 7A to which the lightning receiving portion 20 is connected. And over the end of the pressure side blade surface wall 7B and located on the pressure side blade surface wall 7B side. It is desirable that the rib 10 be bonded to the inner surface of the suction side blade surface wall 10A in advance by an adhesive material via the rib adhesive piece 10A before the suction side blade surface wall 7A and the pressure side blade surface wall 7B are bonded. The rib 10 may be fixed to the suction side blade surface wall 7A, and may be formed integrally with the suction side blade surface wall 7A, or other means such as a bolt or nut mechanically. It may be fixed.

  The rib 10 is connected to the inner surface of the suction side blade surface wall 7A by a rib adhesive piece 10A fixed by an adhesive portion along an end portion connected to the lightning receiving portion 20, and on the inner side in the longitudinal direction of the blade. The rib 10 rises from the end of the rib adhesive piece 10A. The rib 10 has an angle toward the inner surface of the pressure side blade surface wall 7B when the pressure side blade surface wall 7B is joined, and the tip of the rib 10 has a suction side blade surface wall 7A to which the lightning receiving portion 20 is connected. And over the end of the pressure side blade surface wall 7B and located on the pressure side blade surface wall 7B side. It is desirable that the rib 10 be joined to the inner surface of the suction side blade surface wall 10A in advance via the rib adhesive piece 10A before joining the suction side blade surface wall 7A and the pressure side blade surface wall 7B. The rib 10 may be fixed to the suction side blade surface wall 7A, and may be formed integrally with the suction side blade surface wall 7A, or other means such as a bolt or nut mechanically. It may be fixed.

  The rib 10 and the rib 11 have a gap in the longitudinal direction of the blade when the suction side blade surface wall 7a and the pressure side blade surface wall 7b are joined, and the rib surfaces are arranged side by side along the width direction of the blade. To do.

Next, the manufacturing method of the blade for windmills which joins the suction side blade surface wall 7A and the pressure side blade surface wall 7B is demonstrated.
As shown in FIG. 3, the suction side blade surface wall 7A and the pressure side blade surface wall 7B are positioned so as to face the inner side, and the lightning receiving portion 20 is disposed on the tip side.
On the leading edge 5 side, a leading hedge plate 15 along the leading edge 5 is positioned between the end portions of the suction side blade surface wall 7A and the pressure side blade surface wall 7B. The leading edge plate 15 has a shape curved in the width direction, and gives a shape as an outer skin of the leading edge. The leading edge plate 15 is preferably bonded in advance to either one of the negative pressure wall surface wall 7A and the positive pressure side blade surface wall 7B by an adhesive material portion. In this example, the leading edge plate 15 is bonded to the pressure side blade surface wall 7B in advance.
When joining the negative pressure wall surface 7A and the pressure side blade surface wall 7B, a leading edge side adhesive portion 16 is disposed between the outer surface side of the leading edge plate 15 and the inner surface side of the negative pressure side blade surface wall 7A. To join the leading edge plate 15 and the suction side blade surface wall 7A.

  On the trailing edge 6 side, a trailing edge side adhesive material portion 17 is disposed between inner end portions of the suction side blade surface wall 7A and the pressure side blade surface wall 7B, and the suction side blade surface wall 7A and the pressure side blade surface wall 7B are arranged. Face the inside. In this state, the rib 8 and the rib 9 are in a state in which the rib surfaces are arranged in the longitudinal direction of the blade with a gap therebetween. At this time, the rib 8 is positioned on the side close to the trading edge 6.

  Although not shown, at the joint end of the lightning receiving portion 20, the suction side blade surface wall 7A and the pressure side blade surface wall 7B, the lightning side inner surface end portion of the suction side blade surface wall 7A and the pressure side blade surface wall 7B. A lightning-receiving-side adhesive is disposed between the lightning-receiving-side inner surface ends, and the inner surfaces of the suction-side blade surface wall 7A and the pressure-side blade surface wall 7B are opposed to each other. In this state, the rib 10 and the rib 11 are in a state of being aligned along the width direction of the blade with the rib surfaces thereof spaced apart. At this time, the rib 10 is positioned on the side close to the lightning receiving portion 20.

By heating and melting each of the adhesive materials, the negative pressure side blade surface wall 7 </ b> A and the leading edge plate 15 are joined by the leading edge side adhesive material portion 16.
Further, on the trailing edge side, the trailing edge side adhesive material portion 17 is heated and melted, so that the trailing edge side adhesive material portion disposed at the end portion between the negative pressure side blade surface wall 7A and the positive pressure side blade surface wall 7B. 17 wraps inward from the gap between the rib 8 and the inner surface of the pressure-side blade surface wall 7B, fills the gap between the rib 8 and the rib 9, and is adhesively cured. Therefore, it is desirable that a clearance be secured between the suction side blade surface wall 7 and the inner surface of the pressure side blade surface wall 8 facing the ribs 8 and 9. Although the magnitude | size of the clearance gap between the rib and the blade surface wall inner surface which faces is not specifically limited, For example, the range of 0.5-50 mm is employable.
As described above, the suction side blade surface wall 7A and the pressure side blade surface wall 7B are joined by the adhesive portion, and the rib 8 and the rib 9 are joined by the same adhesive portion.

In addition, at the joint end portion between the lightning receiving portion 20 and the suction side blade surface wall 7A and the pressure side blade surface wall 7B, a lightning receiving side adhesive material portion disposed between the suction side blade surface wall 7A and the pressure side blade surface wall 7B is provided. By heat-melting, the lightning-receiving-part-side adhesive material part goes inward from the gap between the rib 10 and the pressure-side blade surface wall 7B, and the gap between the rib 10 and the rib 11 is filled and adhesively cured.
As described above, the suction side blade surface wall 7A and the pressure side blade surface wall 7B are joined via the ribs. Therefore, the ribs can be joined simultaneously with the joining of the wall surfaces.
Due to the above-mentioned joining, on the trailing edge side and the lightning receiving part joining side, since the rib exists in the adhesive material part, the internal pressure load can be withstood by the shear resistance of the adhesive surface.

  By placing FRP reinforcing ribs on the TE-side adhesive part at the blade tip and bonding these FRP reinforcing ribs together, it is possible to change from conventional delamination failure with a low load resistance to a shear failure with a high load resistance. Become. Therefore, even if the internal pressure rises, the FRP reinforcing rib is adhered, so that it can withstand high pressure.

Since this FRP reinforcing rib has an effect of increasing the bending rigidity on the TE side of the blade tip, the durability against repeated bending of the adhesive layer can be increased. In addition, when the internal pressure rises due to a lightning strike, the two FRP reinforcing ribs that are bonded together will resist the force of the blades trying to open, so it is possible to prevent the adhesive material from being peeled and broken. The pressure resistance of the blade can be increased. This is because the use of the fact that the shear resistance of the adhesive portion described above is greater than the peel resistance.
Although the mass increases due to the addition of the reinforcing ribs, the increase in mass is limited because it is only necessary to place it at the tip part where the conventional lightning strike frequency is high. Is very small.

  In the conventional bonding method, there was an example in which the adhesive material part peels and breaks at a low internal pressure, but according to this embodiment, it can withstand a high internal pressure, so even if the blade tip is subjected to a lightning strike, Compared to conventional blades, the degree of breakage can be kept smaller. Therefore, there is an advantage that the repair is completed in a short period of time and the cost is low.

  In the above embodiment, the rib is provided on each of the suction side blade surface wall 7A and the pressure side blade surface wall 7B. However, even if the rib is provided only on one side, the breaking strength can be increased as compared with the case where no rib is provided. This form is also within the scope of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
A test piece was prepared using the same material (FRP) as the wall surface used in the embodiment.
The test piece has a width of 25 cm and a length of 150 cm, two short sides are brought into contact with each other, and the angle between each other is 20 degrees, and the adhesive part made of a thermosetting epoxy resin is placed in the gap between the openings. Arranged. The adhesive part is filled between the test pieces within a range of 120 cm from the contact position of the short piece, and is heat-cured.

Moreover, in the test piece used as the inventive material, a rib adhesive piece having a shape directed inward from the short piece on the opening side was bonded. A rib facing the other test piece side is provided on the inner end portion of the rib adhesive piece in a shape along the width of the test piece, and a gap is provided between the inner surface of the other test piece. The ribs fixed to the two test pieces are juxtaposed with a small gap. The rib on the opening side is in contact with the adhesive. Thereby, the test pieces are joined to each other with the rib interposed therebetween.
Tensile force was applied to the test pieces in the direction of opening, and the tensile force at which the adhesive material was broken was measured. The measurement results are shown in Table 1.

  As shown in Table 1, in the conventional bonding, the adhesive material part is broken with a low tensile force. This is thought to be due to peeling failure. On the other hand, in the bonding according to the method of the present invention, the fracture does not occur up to a high tensile force. This is thought to be because the fracture was not due to peeling fracture but due to shear fracture.

  As described above, the present invention has been described based on the above-described embodiments and examples. However, the present invention is not limited to the description of the above-described embodiments and examples. Embodiments and examples can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Windmill 2 Rotor hub 3 Windmill blade 4 Blade body 5 Leading edge 6 Trailing edge 7A Negative pressure side blade surface wall 7B Positive pressure side blade surface wall 8 Rib 9 Rib 10 Rib 11 Rib 17 Trailing edge side adhesive material part 80 Adhesive part 90 Adhesive part

Claims (14)

A blade blade for wind turbines in which a plurality of divided outer bodies for blades are bonded and bonded by adhesive members at respective ends,
At least one of the first blade divided outer body and the second blade divided outer body to be adhesively bonded to each other inside the first blade divided outer body beyond the end portion, the second blade divided outer body. A rib for windmills, characterized in that a rib extending toward the outer body side is provided, and the rib is joined at least inside the second blade outer shell body by an adhesive portion.   The windmill blade according to claim 1, wherein the first blade divided outer body and the second blade divided outer body have joining ends at a trailing edge and a leading edge, respectively. .   The blade for wind turbines according to claim 1, wherein the rib is along a longitudinal direction of the end portion.   The rib surface of the said rib is located along the peeling direction of the division | segmentation outer body for 1st blades and the division | segmentation outer body for 2nd blades which were adhere | attached, The any one of Claims 1-3 characterized by the above-mentioned. Wind turbine blades according to item.   The said rib is provided in the range within 2 m from the front-end | tip of the blade for windmills, The blade for windmills of any one of Claims 1-4 characterized by the above-mentioned.   The rib is used as a first rib, and a second rib extending beyond the end portion toward the first blade divided outer body side is provided inside the second blade divided outer body. The windmill blade according to any one of claims 1 to 5, wherein the two ribs are joined to at least the first blade outer shell by an adhesive portion.   The first rib and the second rib are arranged side by side with the rib surface, an adhesive member for joining the first rib to the second blade split outer body, and the second rib as the first rib. The blade for wind turbines according to claim 6, wherein an adhesive material part to be joined to the blade split outer body is formed of the same adhesive material part.   The wind turbine blade according to claim 6 or 7, wherein the second rib is provided within a range of 2 m or less from a tip of the wind turbine blade.   The windmill blade according to any one of claims 1 to 8, further comprising a lightning-receiving portion on a tip side of the windmill blade.   A windmill comprising the blade for a windmill according to claim 1. A method for manufacturing a blade for a windmill in which a plurality of blade division outer bodies are bonded and bonded by an adhesive at each end,
At least one of the first blade divided outer body and the second blade divided outer body to be adhesively bonded to each other inside the first blade divided outer body beyond the end portion, the second blade divided outer body. A rib that extends on the outer body side is provided,
When the first blade divided outer body and the second blade divided outer body are bonded and bonded, the rib is bonded to at least the second blade divided outer body with an adhesive. Manufacturing method for wind turbine blades.   12. The method of manufacturing a wind turbine blade according to claim 11, further comprising a step of fixing the rib to the first blade split outer body. The rib is used as a first rib, and a second rib is provided inside the second blade divided outer body so as to extend beyond the end portion toward the first blade divided outer body.
When the first blade divided outer body and the second blade divided outer body are bonded and bonded, the second rib is bonded to at least the first blade divided outer wall with an adhesive. The manufacturing method of the blade for windmills of Claim 11 or 12 characterized by these. A bladed blade joining structure in which a plurality of blade split outer bodies are bonded and bonded by an adhesive portion at each end,
At least one of the first blade divided outer body and the second blade divided outer body to be adhesively bonded to each other inside the first blade divided outer body beyond the end portion, the second blade divided outer body. A windmill blade joining structure, wherein a rib extending on the outer body side is provided, and the rib is joined to at least the inside of the second blade outer shell by an adhesive member.

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