JP2001165033A - Propeller blade for wind power generator and method for manufacturing it, and main spar for propeller blade and method for manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a propeller blade for a wind power generator excellent in durability capable of lightening weight in the case the blade of this kind is very large enlarged and preventing generation of damage and crack even in use for long years. SOLUTION: This propeller blade is constituted by a main spar 13 having a sectional shape of closed curve state to be positioned in a wind pressure center part, front/rear reinforcing members 14, 15 arranged in both sides of this main spar 13, and a reinforced resin-made skin layer 12 wrapping the peripheral total unit of these reinforcing materials 14,15 and this main spar 13, also to be connected in a side of a leading edge 11a which is a side of this blade 10 cutting a wind of a reinforced cloth provided in the skin layer 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller blade for a wind power generator, and more particularly to a blade formed entirely of synthetic resin as a main material, a method of manufacturing the same, and a main girder for forming the blade and a method of manufacturing the same. It is about.

[0002]

2. Description of the Related Art In recent years, a so-called wind power generation method or a wind power generator, in which a large propeller is turned by wind force to obtain electric energy, has come into the spotlight. Needless to say, wind power generation is a highly promising technology because it can provide clean energy.

[0003] Propeller blades, which are important components of such a wind power generator, need to be large and have sufficient rigidity and strength to receive wind in the natural world. Focusing on points,
For example, there is a "rotor blade of a windmill" proposed in Japanese Patent Publication No. 8-167. As shown in FIG. 20, the schematic configuration of this rotor blade is formed by integrating two shell-shaped members, a front side receiving the wind and a rear side thereof, with an adhesive material. Edge side (when the blade rotates in the direction of the arrow in FIG. 1,
A portion on the side where air is cut off, which is the right side portion in FIG. 2) and a joint portion on the trailing edge side.

[0004] When such a seam is present, when the wind is cut off at this portion, sand and possibly pebbles contained in the air (this kind of wind power generator is Because it is installed in a place that blows strongly
It is quite possible that the wind contains sand and pebbles that have been blown away), and this joint is damaged, and peeling or cracks as shown in FIG. It is easy to occur at the leading edge. When such a crack occurs, a large blade does not necessarily scatter and cause a large accident.

For this reason, for example, Japanese Utility Model Application Laid-Open No. 5-01717
No. 4, “windmill blades” have been developed. In this wind turbine blade, as shown in FIG. 22, red pigments are attached in the longitudinal direction at four main positions on the inner surface of the outer skin, and when a crack occurs in the outer skin, the pigment oozes out of the crack to cause a crack. This can be easily detected from outside. However, even if a crack can be detected by the red color, it is not necessarily before the blade that has been damaged by the crack is scattered, and it is considered that it is difficult to determine a major accident prevention.

On the other hand, for the purpose of "improving the strength of the main girder in the longitudinal direction", Japanese Unexamined Patent Publication No.
In the publication, another "windmill blade" is proposed. In this wind turbine blade, according to the summary of the publication, "one-way roving cross is laminated and one-way roving is performed in the longitudinal direction of the main girder of the wind turbine blade whose strength is maintained by the main girder inserted in the longitudinal direction of the outer skin. A glass cloth and a glass mat are laminated in a bandage shape on a lamination of cloths. "However, as shown in FIG. 23, the upper and lower outer skins shown in FIG. It is joined to the leading edge side (the part where air is cut off when the blade rotates in the direction of the arrow in FIG. 1 and the right side part in FIG. 2) and the rear edge side. There is a part.

[0007] Even if the joints are sufficiently adhered or painted, the paints are immediately peeled off by sand or pebbles contained in the air,
This may form pinholes. Thus, peeling of the coating formed on the leading edge of the conventional blade itself causes peeling or cracking between the shells (outer skins) shown in FIGS. In addition, peeling of the paint and pinholes can cause peeling or cracking between the shells due to water penetration and freezing therein.

In particular, this type of wind power generator is installed outdoors where it is exposed to a large amount of ultraviolet rays, and its blades undergo rapid aging including coating and adhesive. The deterioration of the adhesive material at the joint also facilitates the occurrence of peeling or cracking as shown in FIG.

Therefore, the present inventor has proposed that
As a result of repeated investigations on how to make a blade that does not cause cracks or peeling at the leading edge,
The present invention has been completed.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned actual condition of the propeller of a propeller constituting this type of wind power generator. It is to increase sex.

That is, first, an object of the present invention according to claim 1 is to make it possible to reduce the weight of this type of blade when it is extremely large, and to prevent breakage or cracking even after long-term use. An object of the present invention is to provide a propeller blade 10 for a wind power generator, which has excellent durability.

The objects of the present invention according to claims 2 to 4 can achieve the same object as the invention of claim 1 described above, and at the same time, reduce the weight and ensure sufficient rigidity. Another object of the present invention is to provide a blade 10 that can be achieved while performing the above operation.

An object of the invention according to claims 5 and 6 is to provide a manufacturing method capable of manufacturing the blade 10 according to claims 1 and 2 simply and reliably. An object of the invention according to claim 7 and claim 8 is to provide a manufacturing method which can further simplify the manufacturing of the main girder with respect to the manufacturing method according to claim 5 or 6.

It is still another object of the present invention to provide a main girder 13 for increasing the rigidity of the propeller blade 10 with a simple structure. Claims 12 to 1
The object of the invention according to claim 7 is the above-mentioned claims 9 to
An object of the present invention is to provide a method capable of reliably and easily manufacturing the main girder 13 according to claim 11.

[0015]

Means for Solving the Problems In order to solve the above problems, first, means according to the first aspect of the present invention will be described with reference numerals used in the following description of embodiments. "A blade 10 for constructing a propeller for a wind power generator, comprising a main girder 13 having a cross-sectional shape close to a wind pressure center and having a cross-sectional shape, 13, the front and rear reinforcing members 14 and 15 disposed on both sides thereof, and the reinforcing members 14 and 15 and a reinforced resin skin layer 12 wrapping the entire periphery of the main girder 13. A propeller blade 10 for a wind power generator, characterized in that the reinforcing cloth 12a put into the wind turbine blade is continuous on the front edge 11a side of the blade 10 that cuts off the wind of the blade 10.

That is, as shown in FIG. 1, the propeller blade (hereinafter, may be simply referred to as a blade) 10 constitutes a propeller for a wind power generator. As shown in the figure, the main girder 1 has an airfoil cross-sectional shape, and has a closed-curved cross-sectional shape and is located at a position substantially near the center of wind pressure.
2 and 3 are arranged on both sides of the main girder 13 and before and after being formed into a shape as shown in FIGS. 2 and 12 by a material which is expected to have a certain rigidity such as urethane foam. The reinforcing members 14 and 15 and the skin layer 12 made of a reinforced resin that surrounds the entire periphery of the reinforcing members 14 and 15 and the main girder 13.

The blade 10 is formed by curing the skin layer 12 of a resin impregnated in a reinforcing cloth 12a, which is a reinforcing fiber such as a carbon fiber cloth, as shown in FIG. And this skin layer 1
The front edge 11a side portion of the reinforcing cloth 12a constituting the blade 2 that cuts off the wind of the blade 10 is made continuous. Even if the front edge 11a side portion is hit by pebbles or the like, no crack is formed. It is reinforced as follows.

Here, the "wind pressure center portion" refers to the center of the force that the blade 10 receives when receiving wind, and specifically, 20% to 60% of the chord length of the blade 10. The position of The chord length refers to a cross-sectional length that appears when the blade 10 is cut along a plane orthogonal to the length direction, and the position of 20% is a portion 20% inside the cross-sectional length from the wind receiving side. That is.

Of course, the reinforcing cloth 12a is
Since the skin layer 12 is composed of a number of layers, the number of layers is determined in consideration of the strength required for the blade 10. That is, this reinforcing cloth 1
The number of layers 2a to be overlapped is determined by the size or the total length of the blade 10.

As shown in FIG. 5, the skin layer 1 located on the front edge 11a side of the blade 10 which cuts off the wind
By making the reinforcing cloth 12a therein continuous, the strength of the reinforcing cloth 12a itself and the strength of the cured resin in this portion are sufficiently ensured. The strength is much higher than that of the conventional shell type. That is, even if sand or pebbles hit the front edge 11a of the blade 10, the front edge 11a is very rigid due to the reinforcing cloth 12a and the cured resin therein, and the front edge 11a No pinholes or cracks are generated at all, and the blade 10 has extremely high durability and is hardly damaged.

Further, in the case of the one shown in FIG. 2, only one main girder 13 inserted in the blade 10 is present at the center of the wind pressure. And a plurality of blades 1
It may be carried out so that the center of the wind pressure becomes zero.

Therefore, the blade 10 according to claim 1
In addition to being able to secure the entire rigidity sufficiently by the reinforcing members 14 and 15, it is possible not only to reduce the weight when the size is increased, but also to prevent breakage and cracks even if used for many years. It has excellent durability.

Further, in order to solve the above-mentioned problem, a means adopted by the invention according to claim 2 relates to the above-mentioned blade 10 according to claim 1, wherein “the front and rear reinforcing members 14. A reinforced resin for forming the skin layer 12 is supplied into the connection hole 17 formed in FIG. 15 and cured to form a connection resin 18.
Means that the skin layers 12 located on both sides of the main girder 13 are connected. "

That is, in the blade 10 of the second aspect, the front and rear reinforcing members 14.1 arranged on both sides of the main girder 13 are provided.
5, a large number of connection holes 17 are formed in advance, and a reinforced resin for forming the skin layer 12 is filled in the connection holes 17 at the time of molding.
The connection resin 18 is obtained by curing the filling resin in 7.

Therefore, according to the blade 10 of the second aspect, as shown in FIG.
2 are firmly connected by each connecting resin 18, and the rigidity and strength of the whole are sufficient.

Further, in order to solve the above-mentioned problem, a means adopted by the invention according to claim 3 is that the blade 10 according to claim 1 or 2 is described as “at least the front end 11.
The auxiliary reinforcing members 14a and 15a are further interposed between the reinforcing members 14 and 15 located at the position a and the skin layer 12. "

That is, the blade 10 according to claim 3
Has auxiliary reinforcing members 14a, 15a interposed between the reinforcing members 14, 15 and the skin layer 12, as shown in FIGS. 6, 7, 9, 10, or 15.
At least the front end 11a of the blade 10 is reinforced by these auxiliary reinforcing members 14a and 15a.

These auxiliary reinforcing members 14a and 15a are integrally formed by using, for example, synthetic resin or the like as a material.
The reinforcement is performed jointly with the strength of the skin layer 12. However, in order to sufficiently integrate the reinforcing members 14 and 15 with the distal end portions, the reinforcing members 14 and 15 shown in FIGS. Various shapes as shown in FIGS. 9 and 10 (in the case of the auxiliary reinforcing material 15a).

Therefore, the blade 10 according to the third aspect of the present invention.
According to this, not only the same effects as those of the above-described claim 1 or claim 2 can be exhibited, but also at least the front end 11a of the blade 10 can be reinforced more sufficiently.

In order to solve the above-mentioned problem, a means adopted by the invention according to claim 4 relates to the blade 10 according to any one of claims 1 to 3 described above, "in the direction orthogonal to the main girder 13". By dividing the pitch, the pitch can be changed. "

That is, the blade 1 according to claim 4
0 is divided in the direction orthogonal to the main girder 13 as shown in FIG.
In contrast, the front end portion 10b is rotatable. In this way, for example, when a very strong wind is blowing, the pitch between the portions 10a and 10b of the blade 10 is changed as shown in FIG. It is something that can be reduced.

Therefore, the blade 10 according to the fourth aspect of the present invention is provided.
According to the present invention, not only the same effects as in any of the first to third aspects of the present invention can be exerted, but also the pitch of the blade 10 can be changed, and the safety of the blade 10 is promoted. You can do it.

The blade 10 according to claim 1 or claim 2 is manufactured by the manufacturing method according to claim 5 or claim 6. The means adopted by the invention according to claim 5 is as follows. A method for manufacturing a blade 10 constituting a propeller of a wind power generator, comprising a step.

(1) The reinforcing cloth 12a to be the skin layer 12 of the blade 10 is laid on the lower mold 21 with approximately half its center line positioned at the end of the lower mold 21.
(2) a step of forming the main girder 13 to be located at the center of the wind pressure of the blade 10 so that the cross-sectional shape becomes a closed curve; Reinforcing cloth 12 laid on a lower mold 21 with a girder 13
a step of disposing the front and rear reinforcing members 14 and 15 separately on both sides of the main girder 13 while disposing them at predetermined positions on the main girder 13; After covering around the main girder 13 and the front and rear reinforcing members 14 and 15 arranged in the above step (3), a step of clamping with the upper mold 22; (5) inside the upper mold 22 and the lower mold 21 Forming a reinforced resin skin layer 12 wrapping the entire periphery of both the reinforcing members 14 and 15 and the main girder 13 by supplying a synthetic resin to impregnate the reinforcing cloth 12a and then curing the same. 6) a step of polishing, painting, trimming, or the like of the skin layer 12 ".

The means for manufacturing the blade 10 of the second aspect adopts the invention according to the sixth aspect of the present invention, wherein the blade 10 constituting a propeller of a wind power generator comprises the following steps. Manufacturing method.

(1) A reinforcing cloth 12a to be the skin layer 12 of the blade 10 is laid on the lower mold 21 with approximately half of the reinforcing cloth 12a so that its center line is located at the end of the lower mold 21.
(2) a step of forming the main girder 13 to be located at the center of the wind pressure of the blade 10 so that the cross-sectional shape becomes a closed curve; Reinforcing cloth 12 laid on a lower mold 21 with a girder 13
a) disposing the reinforcing members 14 and 15 before and after forming a plurality of connecting holes 17 penetrating from front to back on both sides of the main girder 13 at a predetermined position on the main girder 13; (5) a step of placing the remaining half of the steel sheet 20 outside on the main girder 13 and the front and rear reinforcing members 14 and 15 arranged in the above step (3), and then clamping with the upper die 22; The synthetic resin is supplied into the upper mold 22 and the lower mold 21 to impregnate the reinforcing cloth 12a, fill the connecting holes 17 of the reinforcing members 14 and 15, and then cure them. A step of forming a skin layer 12 made of a reinforced resin that wraps the entire reinforcing members 14 and 15 and the main girder 13 and a connection resin 18 that connects the skin layer 12 therein; (6) the skin layer 12 Polishing, painting or trimming It is carried out under process ".

That is, Claims 5 and 6
The important thing in the manufacturing method of (1) is that the periphery of the core frame 13 and the front and rear reinforcing members 14 and 15 separately arranged on both sides thereof are wrapped by the reinforcing cloth 12a. This is because the main girder 13 and the front and rear reinforcing members 14 and 15 arranged separately on both sides of the main girder 13 reduce the overall weight and constitute the skin layer 12 located at the front edge 11 a of the blade 10. This is to make the reinforcing cloth 12a continuous at the front edge 11a.

What is important in the manufacturing method of claim 6 is that the reinforcing members 14.1 arranged on both sides of the main girder 13 are important.
5 is to use a plurality of connecting holes 17 penetrating on the front and back sides, and by supplying a synthetic resin into these connecting holes 17 and curing the same, the skin layer 12 is connected inside. That is, the connection resin 18 to be formed is formed.

Therefore, according to the manufacturing method according to the fifth and sixth aspects, the blade 10 according to the first and second aspects can be manufactured simply and reliably.

In the manufacturing method of the fifth and sixth aspects, it is assumed that the main girder 13 is formed in advance as a complete one. However, the synthetic resin impregnated with the main girder 13 is thermoset. If they are formed as described above, they can be made as in claim 7 or claim 8.

That is, in order to solve the above-mentioned problem, a means adopted by the invention according to claim 7 is a method similar to that of "a blade 10 constituting a propeller of a wind power generator characterized by including the following steps. Production method.

(1) A reinforcing cloth 12a to be the skin layer 12 of the blade 10 is laid on the lower mold 21 so that a half of the reinforcing cloth 12a is located at an end of the lower mold 21 and
(2) Reinforcing tape 13 to be impregnated with resin later
The main girder 13 which is located at the center of the wind pressure of the blade 10 while the a or the reinforcing cloth 13c is wound or wound.
(3) The main girder material 13A is arranged at a predetermined position on the reinforcing cloth 12a laid on the lower mold 21 and the main girder material 1A is formed.
A step of separately arranging the front and rear reinforcing members 14 and 15 on both sides of the 3A; (4) the other half of the reinforcing girder 13A and the main beam 13A arranged in the step (3), A step of clamping with the upper mold 22 after covering on the front and rear reinforcing members 14 and 15; (5) supplying a synthetic resin into the upper mold 22 and the lower mold 21 to impregnate the reinforcing cloth 12a. By hardening this, the main girder material 13A becomes the main girder 13 and
(6) a step of forming a reinforced resin skin layer 12 enclosing the entire reinforcing members 14 and 15 and the main girder 13; and (6) a step of polishing, painting, trimming, or the like the skin layer 12 ".

That is, in the manufacturing method according to claim 7,
Main girder 1 located at the center of wind pressure of blade 10
Before the mold 3 is put into the mold 20, a reinforcing tape 13 a or a reinforcing cloth 13 c to be impregnated with the resin is wound or left wound to form a main girder material 13 A. The synthetic resin is impregnated into the main beam 13A by supplying the synthetic resin after the insertion.
The main beam 13A is cured by thermosetting the resin.
Is the main girder 13.

For the same purpose, a manufacturing method according to claim 8 provides a method for manufacturing a blade 10 constituting a propeller of a wind power generator, which includes the following steps.

(1) A reinforcing cloth 12a to be the skin layer 12 of the blade 10 is laid on the lower mold 21 so that a center line of the reinforcing cloth 12a is located at an end of the lower mold 21.
(2) Reinforcing tape 13 to be impregnated with resin later
The main girder 13 which is located at the center of the wind pressure of the blade 10 while the a or the reinforcing cloth 13c is wound or wound.
(3) The main girder material 13A is arranged at a predetermined position on the reinforcing cloth 12a laid on the lower mold 21 and the main girder material 1A is formed.
A step of separately arranging the reinforcing members 14 and 15 having a plurality of connecting holes 17 penetrating from the front to the back on both sides of the 3A; (5) a step of clamping the main beam 13A and the front and rear reinforcing members 12a arranged in the step (3) and then clamping the upper mold 22 with the upper mold 22; A resin is supplied to impregnate the main girder material 13A and the reinforcing cloth 12a, and at the same time, is filled in the connection holes 17 of the reinforcing members 14 and 15 and then hardened, so that the main girder material 13A is formed. 13, and both reinforcing members 14, 15 and the main girder 1
3 and a connecting resin 18 for connecting the skin layer 12 inside the reinforcing resin layer 12 and the skin layer 12 inside the reinforcing layer.
(6) a step of finishing the skin layer 12 by polishing, painting, trimming, or the like ”.
Also in the case of manufacturing the blade 10 having the connection resin 18 for connecting the skin layer 12 inside, the main girder material 13A is used as the main girder 13.

Therefore, according to the manufacturing method of the seventh and eighth aspects, it is possible to complete the main girder 13 when forming the skin layer 12 and the like without having to complete the main girder 13 in advance. And the process can be simplified.

The above-mentioned propeller blade 10 has a main girder 13 inside in order to secure the overall rigidity, but this main girder 13 is an invention according to claims 9 to 11. First, the means adopted by the main girder 13 according to claim 9 is that the propeller blade 10 for a wind power generator is located at a position substantially near the center of the wind pressure. The main girder 13 for
A reinforcing tape 13a made of reinforcing fiber such as glass fiber,
A reinforcing tape layer formed by winding so that the cross-sectional shape becomes a closed curve; a reinforcing cloth layer formed by winding a reinforcing cloth 13c made of reinforcing fibers such as glass fiber on the reinforcing tape layer; A main girder 13 for the propeller blade 10, comprising a reinforcing cloth layer and a resin layer obtained by thermally curing a synthetic resin impregnated in the reinforcing tape layer.

That is, the main girder 13 of the ninth aspect comprises a reinforcing tape 13a, a lower reinforcing cloth 13c wound thereon, and a resin layer impregnated into the reinforcing cloth 13c and the reinforcing tape 13a and cured. It becomes something.

Therefore, according to the main girder 13 of the ninth aspect, when incorporated in the propeller blade 10 for a wind power generator, the rigidity of the blade 10 can be made extremely high, and the durability can be improved. Thus, the blade 10 having excellent properties can be obtained.

Similarly, the means adopted by the invention according to claim 10 is that the propeller blade 10 for a wind power generator is located at a position substantially near the center of the wind pressure. The main girder 13, a reinforcing cloth layer 13c formed by winding a reinforcing cloth 13c made of reinforcing fibers such as glass fibers so as to have a closed curve in cross section, and a glass fiber or the like on the reinforcing cloth layer. A propeller comprising: a reinforcing tape layer formed by winding a reinforcing tape 13a made of a reinforcing fiber; and a resin layer obtained by thermosetting synthetic resin impregnated in the reinforcing tape layer and the reinforcing cloth layer. Main girder 13 "for the blade 10.

That is, the main girder 13 of the tenth aspect is:
A reinforcing cloth 13c, a lower reinforcing tape 13a wound thereon,
The reinforcing cloth 13c and the reinforcing tape 13a are impregnated with a cured resin layer.

Therefore, according to the main girder 13 of the tenth aspect, when incorporated in the propeller blade 10 for a wind power generator, the rigidity of the blade 10 can be made extremely high, and the durability can be improved. Thus, the blade 10 having excellent properties can be obtained.

Further, the means adopted by the invention according to claim 11 is that the propeller blade 10 for a wind power generator is located at a position substantially near the center of the wind pressure.
A first reinforcing tape layer configured by winding a reinforcing tape 13a made of reinforcing fibers such as glass fiber so that the cross-sectional shape becomes a closed curve shape;
A reinforcing cloth layer formed by winding a reinforcing cloth 13c made of a reinforcing fiber such as glass fiber on the first reinforcing tape layer, and a reinforcing cloth layer formed by winding the reinforcing tape 13a further on the reinforcing cloth layer. 2 reinforcing tape layers and their second and first
A main girder 13 "for the propeller blade 10, comprising a reinforcing tape layer and a resin layer obtained by thermally curing a synthetic resin impregnated in the reinforcing cloth layer.

That is, the main girder 13 of claim 11 is:
A reinforcing tape 13a, a lower reinforcing cloth 13c wound thereon,
Further, it comprises a reinforcing tape 13a wound thereon, and a resin layer which has been impregnated into the reinforcing cloth 13c and the upper and lower reinforcing tapes 13a and cured.

Therefore, according to the main girder 13 of the eleventh aspect, when incorporated in the propeller blade 10 for a wind power generator, the rigidity of the blade 10 can be made extremely high, and the durability can be improved. Thus, the blade 10 having excellent properties can be obtained.

The main girder 13 described above is manufactured by the following means. First, the manufacturing method according to claim 12 is suitable for manufacturing the main girder 13 of claim 9. The means adopted is "a method of manufacturing a main girder 13 for forming the propeller blade 10 at a position substantially near the center of wind pressure of the propeller blade 10 for a wind power generator, A reinforcing tape 13a made of a reinforcing fiber such as glass fiber is wound around a reinforcing tape 13a made of a reinforcing fiber such as glass fiber to form a reinforcing tape layer. By turning the reinforcing cloth layer, the reinforcing cloth layer and the reinforcing tape layer are impregnated with a synthetic resin and heat-cured to form a resin layer for reinforcing the whole. Propeller blur Which is the main method for producing a digit 13 "for de 10.

Similarly, a manufacturing method according to a thirteenth aspect is a method for manufacturing the main girder 13 according to the tenth aspect, wherein the means adopted is “a substantially wind pressure central portion of the propeller blade 10 for a wind power generator. A method of manufacturing the main girder 13 for configuring the propeller blade 10 at a location close to
A reinforcing cloth 13c made of a reinforcing fiber such as glass fiber is wound so as to form a closed curve in cross section to form a reinforcing cloth layer, and a reinforcing tape 13a made of a reinforcing fiber such as glass fiber is formed on the reinforcing cloth layer. To form a reinforcing tape layer,
The main girder 13 for the propeller blade 10 is characterized in that the reinforcing tape layer and the reinforcing cloth layer are impregnated with a synthetic resin and thermally cured to form a resin layer for reinforcing the whole. Manufacturing method ”.

Further, the invention according to claim 14 relates to a method for manufacturing the main girder 13 according to claim 11, wherein the means adopted is “a propeller blade 1 for a wind power generator.
0 is a method of manufacturing the main girder 13 for configuring the propeller blade 10 located at a position near the center of the wind pressure, wherein the reinforcing tape 13a is made of reinforcing fiber such as glass fiber.
Is wound so that the cross-sectional shape becomes a closed curve, to form a first reinforcing tape layer, and a reinforcing cloth 13c made of reinforcing fibers such as glass fiber is wound on the first reinforcing tape layer to form a reinforcing cloth layer. The reinforcing tape 13a is wound on the reinforcing cloth layer to form a second reinforcing tape layer, and the second and first reinforcing tape layers and the reinforcing cloth layer are impregnated with a synthetic resin. A method of manufacturing the main girder 13 for the propeller blade 10, wherein a resin layer for strengthening the entire structure is formed by heat curing.

The manufacturing methods according to the twelfth to fourteenth aspects are also manufactured as described in the fifteenth to seventeenth aspects. That is, first, in claim 15, “the impregnation of the synthetic resin is performed in advance on the reinforcing tape 13 a and the reinforcing cloth 13 c before being wound, and the prepreg is formed”. The impregnation of the synthetic resin is performed by immersing each of the wound reinforcing tapes 13a and the reinforcing cloth 13c in a resin tank at normal pressure, pressure or reduced pressure. " Item 17 is that “the impregnation of the synthetic resin is performed by spraying the wound synthetic resin onto the reinforcing tape 13a and the reinforcing cloth 13c”.

According to the method of manufacturing the main girder 13 for the propeller blade 10 according to the twelfth to seventeenth aspects,
The main girder 13 having excellent rigidity can be reliably and easily manufactured.

[0061]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a blade according to an embodiment of the present invention; FIG. Since the invention substantially includes all of the inventions of the respective claims, the following description will focus on the blade 10 according to this embodiment.

FIG. 1 shows a blade 1 according to the present invention.
1 schematically shows the entirety of a wind power generator using 0, which is provided with a propeller formed by connecting a plurality of propeller blades 10 to a rotating shaft side at a base end 11c thereof. . This propeller rotates in the direction indicated by the arrow in FIG. 1 when it receives wind on its front side, and as shown in FIG. 11, the forward side of each blade 10 constituting this propeller. Is the leading edge 11a, and each blade 1
The side opposite to the front edge 11a of 0 is the rear edge 11b.

As shown in FIGS. 2 to 13, each of the blades 10 of this embodiment has at least a main girder 1 having a closed curve in cross section and located substantially near the center of wind pressure.
3 and the front and rear reinforcing members 1 arranged on both sides of the main girder 13
4 and 15 and a reinforced resin skin layer 12 surrounding the entire periphery of the reinforcing members 14 and 15 and the main girder 13.

As shown in FIGS. 4 to 8, the skin layer 12 constituting the blade 10 has a reinforcing cloth 12 therein.
a is impregnated with a resin, and the resin is cured to obtain a cross-sectional shape as shown in FIG.
It is molded in a mold 20 described later. in this case,
When the reinforcing cloth 12a has a predetermined thickness, a single layer is sufficient. However, the reinforcing cloth 12a may be formed by laminating a plurality of thin layers.

The reinforcing cloth 12a put in the skin layer 12
It is made of a high-strength, lightweight material such as glass fiber or carbon fiber, and it may be literally woven from warp and weft to form a cloth, or glass fiber etc. It may be implemented by adopting a cloth (chop mat) that has been strained as described above. One of these glass fibers or the like may be used thickly, but it is common to use a plurality of such sheets.
Further, the reinforcing cloth 12a may be implemented as a so-called “prepreg” that has been impregnated with a synthetic resin in advance.

As shown in FIG. 5, the reinforcing cloth 12a is provided on the leading edge 11 of the blade 10 on the side of cutting off the wind.
It is important to make it continuous on the a side. In other words, at the front edge 11a of the blade 10, the reinforcing cloth 12a has no cuts or boundaries. In addition, on the trailing edge 11b side of the blade 10, as shown in FIG. This is because the trailing edge 11b side of the blade 10 is not the side that cuts off the wind, and is not the portion where sand or pebbles hit.

The leading edge 11a and the trailing edge 1 of the blade 10
On the 1b side, as shown in FIG. 14 or FIG.
If an unbroken auxiliary reinforcing cloth 12b is attached to the reinforcing cloth 12a before impregnating with a resin to be described later, the auxiliary reinforcing cloth 12b allows the front edge 11a and the rear edge 11b side portion to be attached. The generation of cracks and pinholes can be further prevented.

The front edge 11a and the rear edge 1 of the blade 10
On the 1b side, auxiliary reinforcing members 14a and 15a are further interposed between the reinforcing members 14 and 15 and the skin layer 12, as shown in FIG. 6, FIG. 7, FIG. 9, FIG. May be done. These auxiliary reinforcements 1
The reference numerals 4a and 15a further reinforce at least the front end 11a of the blade 10 or the rear end 11b.

The auxiliary reinforcing members 14a and 15a are integrally formed using, for example, a synthetic resin or the like.
The reinforcement is performed jointly with the strength of the skin layer 12, but in order to sufficiently integrate the reinforcing members 14 and 15 with the distal end portions, (a) to (d) of FIGS. ) (In the case of the auxiliary reinforcing member 14a), or (a) to (b) of FIGS.
(D) Various shapes as shown in (in the case of the auxiliary reinforcing material 15a) are conceivable.

On the other hand, the main girder 1 constituting the blade 10
3 is a wind pressure center of the blade 10 and the blade 1
0, which is located almost entirely in the major axis direction, and is formed so that the cross-sectional shape is a closed curve. That is, the main girder 13 is formed, for example, by winding a thread, cloth or chop mat made of carbon fiber or glass fiber around the outer periphery of a core material formed of urethane foam or the like, impregnating the resin with the material, and curing the impregnated resin. It will be completed.

In the main girder 13 of this embodiment, the core is extracted and made hollow, but if it is desired to use the rigidity of the core, the main girder 13 without extracting the core may be used. In addition, the main girder 13 may be embodied by filling urethane foam in the empty space from which the core bar has been removed, or may be embodied by filling the core bar with the urethane foam remaining. It is.

The blade 1 in which the main girder 13 is to be built
0 is divided in the direction orthogonal to the main girder 13 as shown in FIG.
In contrast, the tip 10b may be rotatable. By doing so, for example, when a very strong wind is blowing, the pitch between the portions 10a and 10b of the blade 10 is changed as shown in FIG. You can do it. Therefore, in this way, the pitch of the blade 10 can be changed, and the safety can be promoted.

As a more specific method for manufacturing the main girder 13, a so-called "immersion impregnation method" as shown in FIGS. 16 and 17 is employed. A general method of manufacturing a fiber-reinforced plastic called FRP is to wind or attach a thread or cloth made of resin-impregnated glass fiber or the like into a predetermined shape and cure the resin in the thread or cloth. However, it is very difficult to work because the resin drips from the yarn or cloth being wound or stuck. However, if the main girder material 13A not yet impregnated with the resin is subjected to the “immersion impregnation method” in a resin tank filled with the resin as shown in FIG. This is because it does not drip and the work becomes easier.

In FIG. 16, a reinforcing tape 13a made of glass fiber or the like is wrapped around a core material 13b, and a reinforcing cloth 13c is covered thereover. Further, the reinforcing tape 13a is wrapped around the reinforcing cloth 13c to form a main girder material. 13A. In this case, the outermost reinforcing tape 13a may be omitted.

As shown in FIG. 18, the main girder 13 has a cylindrical core 13b of a shape suitable for assembling inside the blade 10 and a reinforcing member made of glass fiber or the like around the core 13b. The tape 13a, the reinforcing cloth 13c, or the thread or the chop mat may be wound and formed.

The main girder member 13A formed as described above is immersed in, for example, a resin bath shown in FIG. In this case, in order to sufficiently impregnate the resin into the reinforcing tape 13a and the reinforcing cloth 13c, the entire resin tank is placed in a negative pressure atmosphere or placed in a high pressure chamber. If the resin sufficiently penetrates into the reinforcing tape 13a or the reinforcing cloth 13c by the immersion impregnation method, the resin is thermoset, for example. The core 13b is pulled out after the resin is cured, and the main girder 13 is completed as described above.

Further, the main girder 13 is composed of a reinforcing tape layer formed by winding a reinforcing tape 13a made of reinforcing fibers such as glass fiber so that the cross-sectional shape becomes a closed curve.
A reinforcing cloth layer formed by winding a reinforcing cloth 13c made of a reinforcing fiber such as glass fiber on the reinforcing tape layer, and a resin obtained by thermosetting the reinforcing cloth layer and the synthetic resin impregnated in the reinforcing tape layer. Or a reinforcing cloth layer formed by winding a reinforcing cloth 13c made of reinforcing fibers such as glass fiber so that the cross-sectional shape becomes a closed curve, and a glass fiber layer formed on the reinforcing cloth layer. A reinforcing tape layer formed by winding a reinforcing tape 13a made of a reinforcing fiber such as a reinforcing fiber layer, and a resin layer obtained by thermosetting a synthetic resin impregnated in the reinforcing tape layer and the reinforcing cloth layer, or ,
"Reinforcing tape 13a made of reinforcing fiber such as glass fiber
Is wound so that the cross-sectional shape becomes a closed curve, and a reinforcing cloth 13c made of reinforcing fiber such as glass fiber is wound on the first reinforcing tape layer. A second reinforcing tape layer formed by winding the reinforcing tape 13a over the cloth layer and the reinforcing cloth layer, and a synthetic resin impregnated in the second and first reinforcing tape layers and the reinforcing cloth layer. And a cured resin layer. "

The main girder 13 described above is manufactured by winding the reinforcing tape 13a and the reinforcing cloth 13c as described above. In this case, a core bar 13b which is later pulled out may be used.
Alternatively, there may be a case where the core bar 13b as shown in FIG.

In manufacturing the metal core 13, the synthetic resin is impregnated in advance into the reinforcing tape 13a and the reinforcing cloth 13c before being wound, and may be made into a prepreg. The reinforcing tape 13a and the reinforcing cloth 13c may be immersed in a resin tank at normal pressure, pressure or reduced pressure. Spraying.

On the other hand, forming the main girder 13 so that its cross-sectional shape is a closed curve means not only the "oval shape" shown in FIG. 4 and the like, but also a square shape, a rhombus shape, or a round shape. This means that the shape may be an ellipse. Forming the cross-sectional shape of the main girder 13 into a closed curve is the same reason that a so-called pipe can be made lightweight and high in rigidity.

When the skin layer 12 is formed around the main girder 13 and around the main girder 13 as shown in FIGS.
In the case of the embodiment shown in FIG.
The rear reinforcing member 15 is used to secure a predetermined space. However, when the blade 10 has a length of several meters or less (the length in the long axis direction in FIG. 1), the front of the blade 10 is required. The reinforcing member 14 and the rear reinforcing member 15 are not always necessary.
Instead, air is filled in place of the front reinforcement 14 and the rear reinforcement 15 as shown in FIGS.
In the mold 20 shown in FIG. 3, a bag forming a predetermined gap may be arranged.

The air-filled bag that expands in a predetermined shape in the mold 20 is advantageous in reducing the overall weight when forming the small blade 10. This is because forming such a bag using a synthetic resin as a material is not only enough to maintain the shape of the skin layer 12 in the mold 20 but also has a small weight as a whole. This is because the weight of the entire blade 10 can be reduced even when the blade 10 is kept in the blade 10.

If the blade 10 has a certain length, it can be simultaneously formed in the mold 20 as described above. As shown in the above, each part may be formed in a divided state. Of course, the respective parts are connected so as to be integrated.

Now, in the blade 10 according to the present invention, the front and rear reinforcing members 14 and 15 are arranged on both sides of the main girder 13 described above. These reinforcing members 14 and 15
Along with the main girder 13, the whole is wrapped by the skin layer 12 described above.

The reinforcing members 14 and 15 are made of urethane foam or the like and are lightweight and formed in a predetermined shape as shown in FIGS. It is located in. In other words, these reinforcing members 14 and 15 serve as a kind of "mold" when forming the skin layer 12, and also ensure the rigidity of the entire blade 10. In addition, by adopting foaming materials for these reinforcing members 14 and 15, weight reduction when the blade 10 has a length of about 20 meters is performed while securing some rigidity. Things.

As shown in FIG. 12, these reinforcing members 14 and 15 have connection holes 17 penetrating from front to back at appropriate positions. Each of these connection holes 17
As shown in FIG. 3, a resin impregnated into the reinforcing cloth 12a when the skin layer 12 is formed is injected, and the resin is cured to form the connection resin 18. It is.

The case of manufacturing the above blade 10 will be described as follows. That is, first, the reinforcing cloth 12 to be the skin layer 12 of the blade 10
a, as shown in FIG. 12, the center line is located at the end of the lower mold 21, and approximately half thereof is laid on the lower mold 21, and the rest is appropriately held on the outer mold 20. is there. Of course, the reinforcing cloth 12a may be a single layer, or may be laid as many layers as necessary.

Next, the main girder 13 is arranged at a predetermined position on the reinforcing cloth 12a, and the front and rear reinforcing members 14 and 15 are separately arranged on both sides of the main girder 13. This main girder 13
Is arranged, if necessary, spacers 16 made of glass or carbon fiber are arranged at predetermined positions above and below the skin layer 12.

Then, as shown in FIG. 12, the remaining half of the reinforcing cloth 12a which has been put out of the mold 20 is put on the main girder 13 and the front and rear reinforcing members 14, 15 arranged as described above. As a result, as shown in FIG.
a, the leading edge 11a which is the side of the blade 10 that cuts off the wind
The part on the side is made to be continuous. Then, the lower mold 21 is clamped by the upper mold 22, and the upper mold 22 and the lower mold 21 are filled with a synthetic resin as indicated by arrows shown in FIGS. 12 and 13. At this time, unnecessary air in the mold 20 is exhausted by an exhaust pump (not shown), and it is needless to say that the inside of the mold 20 is kept airtight by the mold seal 23 shown in FIG.

Then, the resin impregnated in the reinforcing cloth 12a and the like is cured to form the reinforced resin skin layer 12 covering the entire reinforcing members 14, 15 and the main girder 13. Also, each front reinforcement 14 and rear reinforcement 15
When the connection holes 17 are formed in the connection holes 17, the impregnated resin penetrates into these connection holes 17 and is cured to form the connection resin 18 shown in FIG. Of course, it is needless to say that the cured skin layer 12 is subjected to finishing such as polishing, painting, or trimming.

Each connecting resin 18 supports the front and back of the skin layer 12 due to its presence.
It also maintains the overall shape. In other words, these connecting resins 18 are such that the rigidity and shape maintenance within the blade 10 can be performed with a small amount of material.

The mold 20 shown in FIGS.
Is composed of a lower mold 21 and an upper mold 22. The upper mold 22 may be used in a state where it is set at 90 degrees. In this case, since the reinforcing cloth 12a can be laid on the lower mold 21 while the person is standing, workability is improved. In addition, the upper mold 22
Of the lower mold 21 from the lateral direction with respect to the lower mold 21, so that the space in the improvement can be effectively used.

[0093]

As described above in detail, in the first aspect of the present invention, as described in the above embodiment, "a blade 10 for forming a propeller for a wind power generator, The core frame 13 whose cross-sectional shape is a closed curve and which is located substantially near the center of the wind pressure
And front and rear reinforcing members 14 arranged on both sides of the main girder 13.
15 and these reinforcing members 14 and 15 and the main girder 13
And a reinforcing resin skin layer 12 enclosing the entire periphery of the front edge 1 of the reinforcing cloth 12a put in the skin layer 12, which is a side of the blade 10 that cuts off the wind.
1a side has a feature in its configuration. This makes it possible to reduce the weight of this type of blade when it becomes very large, and breaks or cracks even after long use. Thus, the propeller blade 10 for a wind power generator having excellent durability can be provided.

According to the blade 10 of the second aspect, the connection hole 17 formed in the front and rear reinforcing members 14 and 15 disposed on both sides of the main girder 13 is the same as that of the first aspect. The connection resin 18 is formed by supplying and curing a reinforced resin for forming the skin layer 12 therein, and the connection of the skin layers 12 located on both sides of the main girder 13 is achieved by the connection resin 18. " Has that characteristic,
This makes it possible to provide the blade 10 that can achieve the same object as the first aspect of the present invention and that can reduce its weight while ensuring sufficient rigidity.

Further, according to the blade 10 of the third aspect, with respect to that of the first or second aspect,
"At least between the reinforcing members 14 and 15 located at the front end 11a and the skin layer 12, the auxiliary reinforcing members 14a and 15a
And the blade 1 according to claim 4.
According to 0, any one of claims 1 to 3 above has a structural feature in that “the pitch can be changed by dividing in a direction orthogonal to the main girder 13”. Thereby, it is possible to obtain a sufficiently reinforced or safety-provided blade 10.

Further, in the manufacturing method according to the fifth and sixth aspects, a method for manufacturing a blade 10 constituting a propeller of a wind power generator, comprising the following steps.

(1) The reinforcing cloth 12a to be the skin layer 12 of the blade 10 is laid almost half on the lower mold 21 with its center line positioned at the end of the lower mold 21.
(2) a step of forming the main girder 13 located at the center of the wind pressure of the blade 10 with a reinforced resin so that the cross-sectional shape becomes a closed curve; ) The main girder 13 is reinforced with the reinforcing cloth 12 laid on the lower mold 21.
a step of disposing the front and rear reinforcing members 14 and 15 separately on both sides of the main girder 13 while disposing them at predetermined positions on the main girder 13; A step of covering the periphery of the main girder 13 and the front and rear reinforcing members 14 and 15 arranged in the step (3), and then clamping the upper mold 22; (5) inside the upper mold 22 and the lower mold 21; Forming a reinforced resin skin layer 12 wrapping the entire periphery of the reinforcing members 14 and 15 and the main girder 13 by supplying a synthetic resin to the reinforcing cloth 12a and then curing the impregnated cloth. A) a step of performing finishing such as polishing, painting, or trimming of the skin layer 12 "and" a blade 1 constituting a propeller of a wind power generator, comprising the following steps:
0 manufacturing method.

(1) The reinforcing cloth 12a to be the skin layer 12 of the blade 10 is laid on the lower mold 21 so that the center line is positioned at the end of the lower mold 21 and approximately half thereof is laid on the lower cloth 21.
(2) a step of forming the main girder 13 located at the center of the wind pressure of the blade 10 with a reinforced resin so that the cross-sectional shape becomes a closed curve; ) The main girder 13 is reinforced with the reinforcing cloth 12 laid on the lower mold 21.
a) disposing the reinforcing members 14 and 15 before and after forming a plurality of connecting holes 17 penetrating from front to back on both sides of the main girder 13 at a predetermined position on the main girder 13; (5) a step of covering the remaining half which has been taken out outside onto the main girder 13 and the front and rear reinforcing members 14 and 15 arranged in the step (3), and then clamping the upper mold 22; The synthetic resin is supplied into the upper mold 22 and the lower mold 21 to impregnate the reinforcing cloth 12a, fill the connecting holes 17 of the reinforcing members 14 and 15, and then cure them. A step of forming a skin layer 12 made of a reinforced resin that wraps the entire reinforcing members 14 and 15 and the main girder 13 and a connection resin 18 that connects the skin layer 12 therein; (6) the skin layer 12 Polishing, painting or trimming There are its features in the process "to carry out the increase, this way,
The blades 10 and 2 can be easily and reliably manufactured.

According to the manufacturing method according to the seventh or eighth aspect, since the main girder 13 can be completed in the mold 20 without having to make the main girder in advance as a completed product, the blade 10 can be manufactured. Can be further simplified.

According to the ninth to eleventh aspects of the present invention, the main girder 13 for increasing the rigidity of the propeller blade 10 can be provided by a simple configuration. Claims 12 to 17
According to the invention, the main girder 13 according to the ninth to eleventh aspects can be manufactured reliably and easily.

[Brief description of the drawings]

FIG. 1 is a front view of a propeller including a blade according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the blade taken along line 1-1 in FIG.

FIG. 3 is a partially enlarged sectional view taken along line 2-2 in FIG. 2;

FIG. 4 is a partially enlarged sectional view of the blade centered on a main beam.

FIG. 5 is a partially enlarged cross-sectional view of the blade centered on the leading edge.

FIG. 6 is a partially enlarged cross-sectional view of the blade centered on the front edge when an auxiliary reinforcing material is inserted in the front edge.

FIG. 7 is a partially enlarged cross-sectional view showing four types of auxiliary reinforcing members (a) to (d) and focusing on the leading edge of the blade when these are inserted.

FIG. 8 is a partially enlarged sectional view of the blade centered on the trailing edge.

FIG. 9 is a partially enlarged cross-sectional view centered on a front edge when an auxiliary reinforcing material is put in a rear edge of the blade.

FIG. 10 is a partially enlarged cross-sectional view showing four types of auxiliary reinforcing members (a) to (d) and centering on the trailing edge of the blade when these are inserted.

FIG. 11 shows a case where a blade is divided.
(A) is a front view thereof, and (B) is a right side view after the pitch is changed.

FIG. 12 is a cross-sectional view showing a state where a reinforcing cloth and a main girder are arranged on a lower die in order to manufacture the blade.

FIG. 13 is a cross-sectional view showing a state where an upper mold is arranged on the lower mold shown in FIG. 12 in order to manufacture the blade.

FIG. 14 is a partial enlarged cross-sectional view showing an example in which an auxiliary reinforcing cloth is further arranged on the edge of the blade, where (A) is the center of the front edge and (B) is the center of the rear edge.

FIG. 15 shows an example in which an auxiliary reinforcing material is arranged between the edge of the blade and the skin layer, wherein (a) shows the front edge and (b) the rear edge. It is a partial expanded sectional view.

FIG. 16 is a perspective view showing a state where a main girder member is formed.

FIG. 17 is a perspective view showing a state where the formed main girder material is being immersed and impregnated.

FIG. 18 is a perspective view showing another example of forming the main girder member.

FIG. 19 is a front view showing an example in which the blade itself is divided and manufactured.

FIG. 20 is a cross-sectional view schematically showing a conventional blade manufacturing method.

FIG. 21 is a partially enlarged sectional view showing a state of a leading edge of the blade shown in FIG. 20;

FIG. 22 is a cross-sectional view showing another conventional blade.

FIG. 23 is a sectional view showing still another conventional blade.

[Explanation of symbols]

 Reference Signs List 10 blade 11a leading edge 11b trailing edge 12 skin layer 12a reinforcing cloth 12b auxiliary reinforcing cloth 13 main girder 13A main girder material 13a reinforcing tape 13b core material 13c reinforcing cloth 14 front reinforcing material 14a auxiliary reinforcing material 15 rear reinforcing material 15a auxiliary reinforcing material 16 Spacer 17 Connection hole 18 Connection resin 20 Mold 21 Lower mold 22 Upper mold 23 Mold seal

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Kazuya Kato 4-1-1, Sohara Koa-cho, Kakamigahara-shi, Gifu F-term in Tenryu Kogyo Co., Ltd. (Reference) 3H078 AA02 BB12 BB18 BB19 BB21 CC02 4F201 AD02 AD04 AD16 AG06 AG28 AH81 BA06 BC01 BC02 BC12 BC38 BR21 BR37

Claims (17)

[Claims] 1. A blade for forming a propeller for a wind power generator, comprising: a main girder having a closed-curved cross-sectional shape and located substantially near a center of wind pressure; Reinforcing materials arranged before and after both sides of the girder, and a reinforcing resin skin layer that wraps around the entire periphery of the reinforcing material and the main girder, and a reinforcing cloth put in the skin layer, A propeller blade for a wind power generator, wherein the propeller blade is continuous on a leading edge side of the blade that cuts off the wind. 2. The connection resin is formed by supplying and hardening the reinforced resin for forming the skin layer into connection holes formed in front and rear reinforcing members disposed on both sides of the main girder. The propeller blade for a wind power generator according to claim 1, wherein the skin layers located on both sides of the main girder are connected by the connecting resin. 3. A propeller for a wind power generator according to claim 1, wherein an auxiliary reinforcing material is further interposed between the reinforcing material located at least at the front end and the skin layer. blade. 4. The apparatus according to claim 1, wherein a pitch can be changed by dividing the main girder in a direction orthogonal to the main girder.
A propeller blade for a wind power generator according to claim 3. 5. A method for manufacturing a blade constituting a propeller of a wind power generator, comprising the following steps. (1) A step of laying approximately half of the reinforcing cloth to be the skin layer of the blade on the lower mold so that the center line thereof is located at the end of the lower mold, and appropriately holding the rest outside the mold. (2) a step of forming a main girder to be located at the center of the wind pressure of the blade so that the cross-sectional shape becomes a closed curve; (3) a reinforcing cloth laid on the lower die with the main girder A step of arranging the front and rear reinforcing members separately on both sides of the main girder while arranging them at the upper predetermined position; (4) The remaining half of the reinforcing cloth that has been put out of the mold is subjected to the above (3). A step of clamping the upper girder and the front and rear reinforcing members arranged in the process and then clamping with an upper die; (5) supplying a synthetic resin into the upper die and the lower die to impregnate the reinforcing cloth; After being cured, it is hardened to wrap the entire reinforcing members and the main girder. A step of forming a resin skin layer; (6) a step of polishing, painting or trimming the skin layer. 6. A method for manufacturing a blade constituting a propeller of a wind power generator, comprising the following steps. (1) A step of laying approximately half of the reinforcing cloth to be the skin layer of the blade on the lower mold so that the center line thereof is located at the end of the lower mold, and appropriately holding the rest outside the mold. (2) a step of forming a main girder to be located at the center of the wind pressure of the blade so that the cross-sectional shape becomes a closed curve; (3) a reinforcing cloth laid on the lower die with the main girder A step of disposing the reinforcing material before and after forming a plurality of connecting holes penetrating on the front and back sides on both sides of the main girder while disposing the reinforcing cloth at a predetermined position on the main girder; After covering the remaining half on the main girder and the front and rear reinforcing members arranged in the above step (3), a step of clamping with the upper mold; (5) In the upper mold and the lower mold, Supply synthetic resin,
By impregnating the reinforcing cloth, filling the connection holes of the reinforcing members into the connection holes, and then curing the reinforcing holes, a reinforcing resin skin layer wrapping the entire reinforcing members and the main girder; (6) a step of finishing the skin layer by polishing, painting, trimming, or the like; 7. A method for manufacturing a blade constituting a propeller of a wind power generator, comprising the following steps. (1) A step of laying approximately half of the reinforcing cloth to be the skin layer of the blade on the lower mold so that the center line thereof is located at the end of the lower mold, and appropriately holding the rest outside the mold. (2) a main girder material constituting a main girder to be located at the center of the wind pressure of the blade while winding or wrapping a reinforcing tape or a reinforcing cloth to be impregnated with a resin later; (4) arranging the main girder material at a predetermined position on the reinforcing cloth laid on the lower die, and separately arranging front and rear reinforcing materials on both sides of the main girder material; (5) a step of placing the remaining half left outside the mold on the main girder member and the front and rear reinforcing members arranged in the above step (3) and then clamping the mold by the upper mold; The synthetic resin is supplied into the mold and the lower mold, and the reinforcing cloth is impregnated and cured. Forming the main girder material as the main girder, and forming a skin layer made of a reinforced resin that wraps the reinforcing members and the entire main girder; (6) polishing, painting, or trimming the skin layer The process of finishing such as. 8. A method for manufacturing a blade constituting a propeller of a wind power generator, comprising the following steps. (1) A step of laying approximately half of the reinforcing cloth to be the skin layer of the blade on the lower mold so that the center line thereof is located at the end of the lower mold, and appropriately holding the rest outside the mold. (2) a main girder material constituting a main girder to be located at the center of the wind pressure of the blade while winding or wrapping a reinforcing tape or a reinforcing cloth to be impregnated with a resin later; This main girder material is arranged at a predetermined position on the reinforcing cloth laid on the lower die, and a reinforcing material before and after forming a plurality of connection holes penetrating on both sides of the main girder material is divided. Arranging the mold; and (4) placing the remaining half of the reinforcing cloth out of the mold on the main girder member and the front and rear reinforcing members arranged in the step (3), and then using the upper mold. (5) supplying a synthetic resin into the upper mold and the lower mold,
The main girder material and the reinforcing cloth are impregnated, filled into the connection holes of the respective reinforcing members, and then hardened, so that the main girder material becomes the main girder, and both the reinforcing members and the main girder material. A step of forming a reinforced resin skin layer enclosing the entire girder and a connection resin that connects the skin layer inside; (6) a step of finishing the skin layer by polishing, painting, trimming, or the like; 9. A main girder for forming a propeller blade located near a center of wind pressure of a propeller blade for a wind power generator, the reinforcing tape comprising a reinforcing fiber such as glass fiber, A reinforcing tape layer formed by winding so that the cross-sectional shape becomes a closed curve; a reinforcing cloth layer formed by winding a reinforcing cloth made of reinforcing fibers such as glass fiber on the reinforcing tape layer; A main girder for a propeller blade, comprising a cloth layer and a resin layer obtained by thermally curing a synthetic resin impregnated in the reinforcing tape layer. 10. A main girder for forming a propeller blade located near a center of wind pressure of a propeller blade for a wind power generator, the reinforcing cloth comprising reinforcing fibers such as glass fiber, A reinforcing cloth layer formed by winding so that the cross-sectional shape becomes a closed curve; a reinforcing tape layer formed by winding a reinforcing tape made of reinforcing fibers such as glass fiber on the reinforcing cloth layer; A main girder for a propeller blade, comprising a tape layer and a resin layer obtained by thermally curing a synthetic resin impregnated in the reinforcing cloth layer. 11. A main girder for constructing a propeller blade located near a center of wind pressure of a propeller blade for a wind power generator, the reinforcing tape comprising a reinforcing fiber such as glass fiber, A first reinforcing tape layer formed by winding so that the cross-sectional shape becomes a closed curve, and a reinforcing cloth layer formed by winding a reinforcing cloth made of a reinforcing fiber such as glass fiber on the first reinforcing tape layer. A second reinforcing tape layer formed by winding the reinforcing tape further on the reinforcing cloth layer;
A main girder for a propeller blade, comprising a reinforcing tape layer and a resin layer obtained by thermally curing a synthetic resin impregnated in the reinforcing cloth layer. 12. A method of manufacturing a main girder for constructing a propeller blade located near a center of wind pressure of a propeller blade for a wind power generator, the reinforcement comprising a reinforcing fiber such as glass fiber. The tape is wound so that the cross-sectional shape becomes a closed curve to form a reinforcing tape layer, and a reinforcing cloth made of reinforcing fibers such as glass fiber is wound on the reinforcing tape layer to form a reinforcing cloth layer, A method for manufacturing a main girder for a propeller blade, wherein a resin layer for reinforcing the whole is formed by impregnating a synthetic resin into the reinforcing cloth layer and the reinforcing tape layer and thermally curing the resin. . 13. A method of manufacturing a main girder for constructing a propeller blade located near a center of wind pressure of a propeller blade for a wind power generator, the reinforcement comprising a reinforcing fiber such as glass fiber. The cloth is wound so that the cross-sectional shape becomes a closed curve to form a reinforcing cloth layer, and a reinforcing tape made of reinforcing fibers such as glass fiber is wound on the reinforcing cloth layer to form a reinforcing tape layer, Manufacture of a main girder for a propeller blade, wherein the reinforcing tape layer and the reinforcing cloth layer are impregnated with a synthetic resin and thermally cured to form a resin layer for reinforcing the whole. Method. 14. A method of manufacturing a main girder for constructing a propeller blade located near a center of a wind pressure of a propeller blade for a wind power generator, the reinforcing member comprising a reinforcing fiber such as a glass fiber. A first reinforcing tape layer is formed by winding the tape so that the cross-sectional shape becomes a closed curve, and a reinforcing cloth made of a reinforcing fiber such as glass fiber is wound on the first reinforcing tape layer to form a reinforcing cloth layer. The reinforcing tape is wound on the reinforcing cloth layer to form a second reinforcing tape layer, and the second and first reinforcing tape layers and the reinforcing cloth layer are impregnated with a synthetic resin. A method for manufacturing a main girder for a propeller blade, wherein a resin layer for reinforcing the whole is formed by thermosetting. 15. The method according to claim 12, wherein the impregnation with the synthetic resin is performed in advance on the reinforcing tape and the reinforcing cloth before being wound, and the prepreg is formed. Manufacturing method of main girder for propeller blade. 16. The impregnation of the synthetic resin is carried out by immersing each of the wound reinforcing tapes and reinforcing cloths in a resin tank at normal pressure, pressure or reduced pressure. A method for manufacturing a main girder for a propeller blade according to any one of claims 12 to 14. 17. The method according to claim 12, wherein the impregnation of the synthetic resin is performed by spraying the wound synthetic resin on the reinforcing tape and the reinforcing cloth. 3. A method for manufacturing a main girder for a propeller blade according to claim 1.