Blade protection method and blade protection bag

Abstract

To provide a blade curing method that can eliminate the need of high-place works in the highest part of a power-generating wind turbine and reduce both construction cost and work labor.SOLUTION: A blade curing method for curing a blade 4 of a lying power-generating wind turbine 1 includes: a bag body fitting step of covering a lower end part of the blade 4 in a downward state with a bag body 11 in a folded state; a turning step of turning the blade 4 so as to make the blade 4 fitted with the bag body 11 become upward; and a bag body deploy step of deploying the bag body 11 and covering the blade 4 with the deployed bag body.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a blade curing method and a blade curing bag for curing the blades of a power-generating wind turbine. [Background technology]

[0002] Patent Document 1 describes a method for tilting a power-generating wind turbine. This method includes a bending position setting step for setting a bending position at a midpoint of the tower, a cord-like body attachment step for fixing one end of a first wire to the top end of the tower and guiding the first wire downward through a relay part provided near the bending position, a cut part forming step for forming a cut part at the bending position of the tower on the opposite side to the bending direction, and a bending step for applying a force in the bending direction to the tower above the bending position while pulling the second wire downward, and the bending step is continued until the nacelle and blades reach a predetermined low position. This allows for quick and easy dismantling of the power-generating wind turbine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 092609 Summary of the Invention [Problem to be solved by the invention]

[0004] The method of toppling in Patent Document 1 had a problem in that when the power-generating wind turbine fell over, the blades collided with the ground and broke, scattering the glass-reinforced fiber that the blades were made of. This called for protecting the blades, but because the blades of a power-generating wind turbine are installed at a high altitude, it would be necessary to use a large crane to carry out high-altitude work at the top of the power-generating wind turbine, which would require a lot of construction costs and labor. From this perspective, the present invention has an objective of providing a blade protection method and a blade protection bag that eliminate the need for high-altitude work at the top of a power-generating wind turbine, thereby reducing construction costs and labor. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides a blade curing method for curing the blades of a wind turbine for generating electricity that is to be turned over. The blade curing method includes: A bag body having a cylindrical body portion and a bottom portion formed at one end of the body portion is folded in a state where the body portion is folded. The method includes a bag attachment step of covering the blade with a bag, a rotation step of rotating the blade so that the blade to which the bag is attached faces upward, and a bag deployment step of deploying the bag to cover the blade. In the bag attachment step, the blade is inserted through an opening at the other end of the body of the bag, and the bag is attached to an attachment portion attached to a tip of the blade. It is characterized by: According to the blade curing method of the present invention, the work at the highest position is the bag attachment process, but this is at the height of the lower end of the blade, which is significantly lower than the top of the power-generating wind turbine. Therefore, high-altitude work at the top of the power-generating wind turbine is not necessary, and construction costs and labor can be reduced.

[0006] In the blade curing method of the present invention, it is preferable that the bottom of the bag is fixed to the tip of the blade in the bag attachment step. According to this method, the bag attachment step can be performed at the lowest position of the blade. In the blade curing method of the present invention, it is preferable that the bag body has a string-like maintaining member that maintains the folded state, and in the bag body unfolding step, the bag body is unfolded after the folded state is released. According to this method, the bag body does not unfold during the rotation step. Also, the blade is turned upward, and the bag body can be unfolded in a stable state after the folded state of the bag body is released. In the blade curing method of the present invention, the bag attachment step is preferably performed by a worker standing on a gondola or scaffolding that can be moved to a high place. According to such a method, the bag attachment step can be performed safely.

[0007] The second aspect of the present invention for solving the above problem is a blade curing method for curing blades of a wind turbine for power generation that is to be overturned, comprising the steps of: The device has a folded cylindrical body and a bottom formed at one end of the body. bag body The opening side of the other end of the body a lifting member hooking step of hooking a string-like lifting member connected to the blade to a base end of the blade or a rotation support part that supports the blade, and a bag lifting step of pulling the lifting member to lift the bag, thereby covering the blade in a downward state with the bag. In the bag lifting process, the opening side is pulled upward, the body portion unfolds from the folded state, the opening rises from the lower end of the blade facing downward to the base end, and the bag covers the blade. It is characterized by: According to the blade curing method of the present invention, the hoisting member hanging process is carried out remotely from the ground, and the hoisting member is pulled from the ground in the bag body hoisting process, eliminating the need for high-altitude work at the top of the power-generating wind turbine, and thereby reducing construction costs and labor. In the blade curing method of the present invention, it is preferable to further include an opening closing step of closing the opening of the bag body on the base end side of the blade while covering the blade. According to this method, the opening of the bag body is closed, so that it is possible to prevent fragments of the blade from scattering outside the bag body.

[0008] The third aspect of the present invention for solving the above problems is a blade protection bag for protecting the blades of a wind turbine for generating electricity that is to be turned over. A cylindrical body and a bottom portion formed at one end of the body. The device is characterized by comprising a bag body, a fixing portion for fixing the bag body to the tip end of the blade, and an opening closing member for closing the opening of the bag body that is on the base end side of the blade when covering the blade. According to the blade protection bag of the present invention, the folded bag body can be easily attached to the lower end of the downward-facing blade by covering it. This attachment work is performed at the height of the lower end of the blade, which is a position significantly lower than the top of the power-generating wind turbine. Therefore, high-altitude work at the top of the power-generating wind turbine is not necessary, and construction costs and labor can be reduced. In addition, since the bag body can be closed, it is possible to prevent blade fragments from scattering outside the bag body.

[0009] In the blade curing bag of the present invention, the bag body is preferably folded in an accordion shape. With such a configuration, the bag body can be smoothly unfolded in a state where it is placed over the blade. In the blade curing bag of the present invention, it is preferable that a string-like maintaining member is further provided for maintaining the folded state of the bag body. With such a configuration, the blade can be rotated while maintaining the folded state of the bag body. Also, the bag body can be unfolded after the blade is turned upward and the folded state of the bag body is released. Effect of the Invention

[0010] The blade curing method and blade curing bag of the present invention eliminate the need for high-altitude work at the top of a power-generating wind turbine, thereby reducing construction costs and labor. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing a blade protection method according to a first embodiment of the present invention, in which (a) is a front view of a power-generating wind turbine showing the bag attachment process, (b) is a front view showing the rotation process, and (c) is a front view showing the bag deployment process. [Diagram 2] FIG. 2 is a perspective view showing a blade protective bag according to the first embodiment of the present invention. [Diagram 3] FIG. 2 is a perspective view showing the blade protective bag according to the first embodiment of the present invention in a folded state. [Figure 4] FIG. 2 is a front view showing the blade protective bag according to the first embodiment of the present invention in a folded state. [Diagram 5] FIG. 2 is a front view showing a bag expanding process of the blade curing method according to the first embodiment of the present invention. [Figure 6] FIG. 2 is a front view showing the opening closing step of the blade curing method according to the first embodiment of the present invention. [Figure 7] Fig. 2 is a side view showing a state in which a power-generating wind turbine is toppled over; Fig. 3 is a plan view showing a state in which a tower-like structure is toppled over; [Figure 8] FIG. 11 is a front view of the power-generating wind turbine showing the hoisting member hooking process, and FIG. 11 is a front view of the power-generating wind turbine showing the bag hoisting process, illustrating a blade protection method according to a second embodiment of the present invention. [Figure 9] FIG. 11 is a side view of a power-generating wind turbine illustrating a bag body lifting step of a blade curing method according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A blade protection method and a blade protection bag according to a first embodiment of the present invention will be described with reference to the attached drawings. The blade protection method and the blade protection bag are intended to protect the blades when the power-generating wind turbine is overturned during dismantling of the power-generating wind turbine. Figure 1 shows a blade protection method according to a first embodiment of the present invention, in which (a) is a front view of a power-generating wind turbine showing a bag attachment process, (b) is a front view showing a rotation process, and (c) is a front view showing a bag deployment process.

[0013] As shown in FIG. 1, a power-generating wind turbine 1 includes a tower 2, a nacelle 3, and blades 4. The tower 2 is a tower body made of, for example, steel pipes, and is fixedly supported by a foundation 6 that is fixed to the ground 5. The nacelle 3 is a device that generates electricity using the rotation of the blades 4, and is installed at the upper end of the tower 2. The nacelle 3 is configured with a power rotating shaft, a speed increaser, a brake device, and a generator inside a casing. The casing protrudes forward and backward along the direction of the rotation axis at the upper end of the tower 2. The speed increaser is a device that increases the rotation speed of the power rotating shaft, and is provided by combining multiple gears. The brake device is a device that stops the rotation of the power rotating shaft during maintenance, etc. A plurality of blades 4 (for example, three blades) are provided on a hub provided at the front end of the nacelle 3, and are arranged radially around the hub.

[0014] First, the configuration of the blade protection bag 10 will be described. As shown in Figures 2 to 4, the blade protection bag 10 according to this embodiment is used to protect the blades 4 of the power-generating wind turbine 1 that is to be overturned. The blade protection bag 10 includes a bag body 11, a fixing part 12, an opening closing member 13, a folded state maintaining member 14, and an unfolding towing member 15. The bag 11 is a long member that covers the blade 4 and is foldable. The bag 11 is made of, for example, a synthetic fiber construction sheet. The bag 11 has a body 16 that is a square tube with a rectangular cross section, a bottom 17 formed at one end in the longitudinal direction of the body 16, and an opening 18 provided at the other end in the longitudinal direction.

[0015] On each side of the body 16, peaks and valleys are alternately formed along the longitudinal direction. In other words, the body 16 is bellows-shaped. A band-shaped reinforcing belt 19 is attached along the longitudinal direction to the middle of the width of each side of the body 16. The reinforcing belt 19 is configured to be foldable along the peaks and valleys, and expands and contracts in response to the expansion and contraction of the body 16. A rope loop 20 is provided on each of the reinforcing belts 19 located at the top of each peak. The rope loop 20 is formed in a ring shape, and the folded state maintaining member 14 is inserted through it. A plurality of ventilation holes 21 are formed in the bottom 17 (see FIG. 3). The ventilation holes 21 are for ensuring breathability inside the bag body 11 and make work easier during installation and transportation. A plurality of ventilation holes 21 (four in this embodiment) are formed in the center of the bottom 17. Note that if the bag body 11 is formed from a breathable material, ventilation holes 21 do not need to be provided.

[0016] The fixing part 12 is a part that fixes the bag body 11 to the tip of the blade 4. The fixing part 12 is composed of a locking member 22. The locking member 22 is a string-like member with a locking part 23 at its tip, and the base end of the locking member 22 is attached to the end of the bottom part 17 side inside the body part 16 of the bag body 11. As shown in FIG. 3, the locking part 23 is hooked to a locking protrusion 24 attached to the tip of the blade 4. The locking protrusion 24 is fixed to the side of the blade 4 by adhesion or the like after the installation. The locking protrusion 24 has an L-shape with its tip bent toward the base end side of the blade 4. Two locking members 22 are provided, and are attached to a pair of side surfaces facing each other among the side surfaces of the body part 16. The locking protrusion 24 is not limited to an L-shape, and may be any shape that has a large tip and can lock the locking part 23, such as an eye bolt.

[0017] As shown in Figs. 2, 4 and 6, the opening closing member 13 is a member that closes the opening 18 of the bag body 11 on the base end side of the blade 4 when covering the blade 4. The opening closing member 13 is configured with a rope 25 and a ring member 28. The rope 25 is wound around the outer surface of the opening tube portion 26 that surrounds the opening 18. The rope 25 is hung on the opening tube portion 26 via a rope hanging member 27 attached to the outer surface of the opening tube portion 26. The rope hanging member 27 is a vertically long belt-shaped member, and both upper and lower ends are fixed to the opening tube portion 26. The rope 25 is inserted between the middle part of the rope hanging member 27 and the opening tube portion 26. The rope 25 goes around the opening tube portion 26 twice, and is long enough that both ends reach the ground when the opening 18 is closed. At the portion where the rope 25 is bent downward from the rope hooking member 27, a ring member 28 is provided to bundle the rope 25 extending from both sides. The rope 25 is inserted through the ring member 28, and when the rope 25 is pulled from the ground, the downward pulling force is converted into a circumferential force of the opening tube portion 26 (a force that squeezes the opening tube portion 26), and the effect of facilitating the closing operation of the opening 18 is obtained. The ring member 28 is supported by a support string 30, and the support string 30 is hooked on a support ring 29 fixed to the outer surface of the opening tube portion 26. One end of the support string 30 is connected to the ring member 28, and the other end extends to the ground. When the support string 30 is pulled from the ground during the closing operation, the ring member 28 is pulled up to the support ring 29 side (see FIG. 6). The ring member 28 is pulled up to the height of the rope hooking member 27, and the direction of the pulling force of the rope 25 is smoothly changed.

[0018] As shown in Figs. 2 and 4, the folded state maintaining member 14 is a string-like member for maintaining the bag body 11 in a folded state, and is composed of a pair of ropes 31a, 31b provided on the side of the body 16 of the bag body 11. One end of each rope 31a, 31b is fixed to the outer surface of the opening tube portion 26, and the portion extending from the one end is inserted into a plurality of rope guides 20 provided at the top of the mountain portion of the body 16. One rope 31a extends from the rope guide 20 located closest to the bottom 17, and has a length such that the other end reaches the ground. The other rope 31b extends from the rope guide 20 located closest to the bottom 17, and has a length such that the other end can be tied in a bow with the one rope 31a. One end of the ropes 31a, 31b is pulled toward the bottom 17 to fold the bag body 11, and the other ends of the ropes 31a, 31b are tied in a bow. This maintains the folded state with the opening tube portion 26 close to the bottom portion 17. When releasing the folded state, the other end of one of the ropes 31a is pulled from the ground to untie the bow, releasing the maintenance of the opening tube portion 26 by the rope 31, and the bag body 11 becomes unfoldable. The bag body 11 can be easily unfolded by folding it in a bellows state. The cross section of the bellows is formed as a polygon with an even number of sides, and the peaks of adjacent sides are folded alternately into peaks and valleys. The rope 31 is passed through the rope guide 20 installed in the peaks of the bellows body, so folding is easy by folding the rope guide part so that it forms a peak. When the rope 31 is tightened, the bag body 11 is folded in a bellows shape.

[0019] As shown in Figs. 2 and 4, the deployment traction member 15 is a member that pulls the opening tubular portion 26 from the ground when deploying the bag body 11, and includes a locking member 32 and a rope 33. The locking member 32 is made of a belt-shaped member, and a base end portion is fixed to the outer surface of the opening tubular portion 26. The tip portion of the locking member 32 is bent into a ring shape to lock the rope 33. The rope 33 is a member having one end tied to the locking member 32 and the other end reaching the ground. By pulling the rope 33 from the ground, the opening tubular portion 26 is pulled downward, and the bag body 11 deploys to cover the blade 4.

[0020] Next, a blade protection method according to the first embodiment will be described. This blade protection method is a method for protecting the blades 4 of the power-generating wind turbine 1 that is to be overturned, and includes a first rotation step, a bag attachment step, a second rotation step, a bag deployment step, and an opening closing step. The first rotation step is a step of rotating the blade 4 so that the tip of the blade 4 to be cured faces downward. In the first rotation step, the blade 4 is rotated to a position where it is vertical and fixed in place. Note that if the blade 4 is originally stopped facing downward, the first rotation step can be omitted.

[0021] The bag attachment process is a process of covering and attaching the blade protective bag 10 to the lower end of the blade 4 in a downward facing state. As shown in FIG. 1(a), the bag attachment process is performed by a worker riding on a gondola. The gondola may be any size as long as it reaches the height of the lower end of the blade 4 in a downward facing state. In the bag attachment process, first, the locking protrusion 24 is fixed to the side of the lower end of the blade 4. Thereafter, the blade protective bag 10 with the bag body 11 folded is placed over the underside of the blade 4, and the locking member 22 of the fixing part 12 is locked to the locking protrusion 24 (see FIG. 3).

[0022] The second rotation step is a step of rotating the blade so that the blade to which the bag body is attached faces upward. When the first rotation step is omitted, the second rotation step may be simply called the rotation step. As shown in FIG. 1(b), in the second rotation step, the blade 4 is rotated 180 degrees and fixed. At this time, the blade curing bag 10 is maintained in a folded state by the folded state maintaining member 14. Therefore, the bag body 11 does not unfold during the rotation of the blade 4, and the blade 4 can be rotated in a stable state. The bag unfolding process is a process in which the bag 11 of the blade protective bag 10 is unfolded to cover the blade 4. In the bag unfolding process, first, as shown in Fig. 4, of the ropes 31, 31 of the bow-tied folded state maintaining member 14, one of the ropes 31 that extends to the ground is pulled from the ground to untie the bow. This allows the opening tube portion 26 of the blade protective bag 10 to move downward, and the bag 11 can be unfolded. 5, the rope 33 of the deployment traction member 15 is pulled from the ground and pulled downward until the opening tube portion 26 is positioned at the base end (lower end) of the blade 4. This causes the bag body 11 of the blade protective bag 10 to deploy and cover the blade 4.

[0023] The opening closing step is a step of closing the opening 18 of the bag body 11 on the base end side of the blade 4 while covering the blade 4. In the opening closing step, as shown in Figures 2 and 6, first, the support string 30 is pulled from the ground, and the ring member 28 is raised to the height of the rope hooking member 27. Then, both ends of the rope 25 of the opening closing member 13 are pulled from the ground, and the opening tube portion 26 is tightened from the outside. At this time, the downward force pulling the rope 25 is converted to a horizontal force via the ring member 28, and the opening tube portion 26 can be tightened efficiently. The above steps complete the curing of one blade 4. The other two blades 4 are cured by carrying out the same steps as above.

[0024] After the protection of the blades 4 is completed, the power-generating wind turbine 1 is turned over, as shown in Fig. 7. At this time, it is expected that the blades 4 will collide with the ground and be damaged, but in this embodiment, the blades 4 are covered with the blade protection bag 10, so that scattering of fragments of the material of the blades 4 into the surrounding area can be prevented. Furthermore, the openings 18 are closed with the opening closing member 13, so that scattering of fragments of the material of the blades 4 from the openings 18 can be prevented, and the effect of suppressing scattering of fragments is further enhanced.

[0025] According to the blade protection method of this embodiment, when installing the blade protection bag 10, the work at the highest position is the bag attachment process, but the bag attachment process is carried out at the height of the lower ends of the blades 4. Therefore, the work is carried out at a position significantly lower than the top of the power-generating wind turbine 1. In other words, high-altitude work at the top of the power-generating wind turbine 1 is no longer necessary, which makes it possible to reduce construction costs and work effort. In addition, in the bag attachment process, the bottom 17 of the bag 11 is fixed to the tip of the blade 4 by the fixing part 12, so that the attachment work of the bag 11 can be performed at the lowest position of the blade 4. Furthermore, since the attachment work of the bag 11 is performed by a worker on a gondola or scaffolding that can be moved to a high place, the bag attachment process can be performed safely.

[0026] Next, a blade curing method according to the second embodiment will be described with reference to Figs. 8 and 9. First, the structure of a blade curing bag 50 used in the blade curing method of this embodiment will be described. As shown in Fig. 8, the blade curing bag 50 is configured as a foldable bag body, and has a body 51, a bottom 52 formed at one end in the longitudinal direction of the body 51, and an opening 53 provided at the other end in the longitudinal direction. On the side of the body 51, peaks and valleys are alternately formed along the longitudinal direction. That is, the body 51 is bellows-shaped, and the bag body is foldable. The blade curing bag 50 is transported in a folded state, and is unfolded when it is installed on the blade 4.

[0027] A lifting member 54 is connected to the opening 53 side of the bag body. The lifting member 54 is a string-like member having one end connected to the bag body, and a middle part hooked to a hub (a rotation support part that supports the blade 4) provided at the base end of the blade 4 or the tip end of the nacelle 3. The lifting member 54 hooked to the hub is folded back downward at the hub, and the other end extends toward the ground. The lifting member 54 has a length dimension that is approximately twice the height dimension of the hub, and extends from the blade protective bag 50 placed on the ground in a folded state, and is folded back at the hub, so that the other end reaches the ground. An opening closing member (not shown) that closes the opening 53 of the bag body is provided on the opening 53 side of the bag body. The opening closing member has the same configuration as the opening closing member 13 of the first embodiment, and therefore a description thereof will be omitted.

[0028] The blade curing method according to this embodiment includes a rotating step, a lifting member hooking step, a bag body lifting step, and an opening closing step. The rotation process is a process of rotating the blade 4 so that the tip of the blade 4 to be cured faces downward. Note that if the blade 4 is originally stopped facing downward, the rotation process can be omitted.

[0029] The hoisting member hooking process is a process of hooking the hoisting member 54 to the base end of the blade 4 or to the rotating support part (hub) that supports the blade 4. In the hoisting member hooking process, a UAV (Unmanned aerial vehicle) such as a drone 55 is attached to the tip end of the hoisting member 54 (the other end opposite the blade protective bag 50). Then, the drone 55 is raised together with the tip end of the hoisting member 54 to above the rotating support part and lowered to the ground after straddling the upper part of the rotating support part, or the end of the hoisting member is dropped from the air. This causes the hoisting member 54 to be hooked to the rotating support part. In addition, when the lifting capacity of the drone 55 is less than the weight of the lifting member 54, the lifting member 54 may be connected to a lighter lifting member, and after the lighter lifting member is hooked by the drone 55, the lighter lifting member may be pulled to sequentially pull up the lifting members with larger diameters, thereby lifting the bag body. In addition, the means for hooking the lifting member 54 is not limited to the drone 55, and may be a crane or a long rod-shaped member.

[0030] The bag body lifting process is a process of lifting the blade protective bag 50 (bag body) by pulling the lifting member 54, and covering the downward-facing blade 4 with the blade protective bag 50. In the bag body lifting process, the drone 55 is removed from the tip of the lifting member 54, and the lifting member 54 is pulled from the ground. As a result, the opening 53 side of the blade protective bag 50 is pulled upward and unfolded from the folded state. Even after the unfolding of the blade protective bag 50 is completed, the lifting member 54 continues to be pulled, and the blade protective bag 50 is lifted from the ground. At this time, the position of the blade protective bag 50 is adjusted from the ground so that the opening 53 of the blade protective bag 50 is located at the lower end of the downward-facing blade 4. The pulling of the lifting member 54 is continued until the opening 53 of the blade protective bag 50 rises to the base end of the blade 4 and the blade protective bag 50 covers the blade 4.

[0031] The opening closing step is a step of closing the opening 53 of the bag body on the base end side of the blade 4 while covering the blade 4. In the opening closing step, similar to the first embodiment, the support string and rope are pulled from the ground and the opening tube portion is tightened from the outside to close the opening 53. The above steps complete the curing of one blade 4. The other two blades 4 are cured by carrying out the same steps as above.

[0032] According to the blade curing method of the second embodiment, when the blade curing bag 50 is installed on the blade 4, the lifting member 54 is hooked to the rotating support portion using a drone 55, and the tip of the lifting member 54 is pulled from the ground, so that work at a high place is not required. Therefore, it is possible to reduce construction costs and work effort. In addition, the configuration of the blade curing bag 50 can be simplified compared to the blade curing bag 10 of the first embodiment, so that the manufacturing cost can be reduced. In the second embodiment, the blade 4 is covered with the blade protective bag 50, so that, similarly to the first embodiment, it is possible to prevent fragments of the material of the blade 4 from scattering to the surroundings. Furthermore, since the opening 53 is closed after the blade 4 is covered with the blade protective bag 50, the effect of preventing scattering of fragments is further enhanced.

[0033] Although the embodiment for carrying out the present invention has been described above, the present invention is not limited to the above embodiment, and appropriate design changes are possible within the scope of the present invention. For example, in the above embodiment, the blade protective bag 10 is fixed to the blade 4 by hooking the locking portion 23 provided at the tip of the string-like locking member 22 fixed to the blade protective bag 10 to the locking protrusion 24 attached to the tip of the blade 4, but the present invention is not limited to this. For example, a bolt hole may be formed in the bottom 17 of the bag body 11, and the tip of the blade 4 may be directly bolted to it. In the above embodiment, the rope 33 of the unfolding towing member 15 is pulled from the ground to unfold the blade protective bag 10, but this is not limited to this. For example, a weight may be attached to the opening tube portion 26, and after the folded state is released, the blade protective bag 10 may be unfolded by the weight of the weight. [Explanation of symbols]

[0034] 1. Wind turbines for generating electricity 4 Blades 10 Blade Protective Bag 11 Bag body 12 Fixed part 13 Opening Closure 14 Folded state maintaining member 15 Deployment traction member 18 Openings 50 Blade Protective Bag 54 Retractable parts 55 Drone

Claims

1. A blade curing method for curing blades of a power-generating wind turbine that is overturned, comprising the steps of: a bag attachment process in which a bag having a cylindrical body and a bottom formed at one end of the body is placed over the lower end of the blade in a downward facing state with the body folded; a rotating step of rotating the blade so that the blade with the bag attached faces upward; and a bag deployment step of deploying the bag to cover the blade, In the bag attachment step, the blade is inserted through an opening at the other end of the body of the bag, and the bag is locked to a locking portion attached to a tip of the blade. A blade curing method comprising the steps of:

2. In the bag attachment step, a bottom portion of the bag is fixed to a tip portion of the blade.

2. The blade curing method according to claim 1,

3. The bag body includes a string-like maintaining member for maintaining the folded state, In the bag unfolding step, the bag is unfolded after being released from the folded state.

3. The blade curing method according to claim 1 or 2.

4. The bag attachment process is performed by workers standing on a gondola or scaffolding that can be moved to a high place. The blade curing method according to any one of claims 1 to 3.

5. A blade curing method for curing blades of a power-generating wind turbine that is overturned, comprising the steps of: a pulling member hooking step of hooking a string-like pulling member connected to an opening side of the other end of the body of a bag body having a folded cylindrical body and a bottom portion formed at one end of the body to a base end of the blade or a rotation support portion that supports the blade; a bag body lifting step of pulling the lifting member to lift the bag body to cover the blade in a downward state with the bag body, In the bag lifting process, the opening side is pulled upward, the body portion unfolds from the folded state, the opening rises from the lower end of the blade facing downward to the base end, and the bag covers the blade. A blade curing method comprising the steps of:

6. The method further includes an opening closing step of closing the opening of the bag body that is on the base end side of the blade while covering the blade. The blade curing method according to any one of claims 1 to 5.

7. A blade protection bag for protecting the blades of a power-generating wind turbine that is to be overturned, The device is provided with a bag having a foldable cylindrical body and a bottom formed at one end of the body, a fixing part for fixing the bag to the tip end of the blade, and an opening closing member for closing an opening of the bag on the base end side of the blade when the bag is covered with the blade. A blade protective bag characterized by:

8. The bag is folded in an accordion shape.

8. The blade protection bag according to claim 7.

9. The bag further includes a string-like maintaining member for maintaining the folded state of the bag. The blade protective bag according to claim 7 or 8.

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