Heavy object movement device and heavy object elevation adjustment method

Abstract

To provide a heavy object movement device capable of removing or inserting a member without any damage, and a heavy object elevation adjustment method.SOLUTION: The present invention relates to a heavy object movement device J which is used in a wind power generator F comprising a main shaft 9 to which a wind turbine rotary vane 5 and a rotor head 4 are fixed, a speed increaser 8 that increases a rotational speed of the main shaft 9, and a nacelle base frame 7 that supports the main shaft 9 and the speed increaser 8, and which is used for attaching and detaching the speed increaser 8. The heavy object movement device comprises a main shaft pressing jig 13 having: a support part that supports the main shaft on the nacelle base frame; and first adjustment parts b1a to b1e that adjust a position of the support part 13s in both right-left and up-down directions so as to center the main shaft 9 relative to the speed increaser 8.SELECTED DRAWING: Figure 16

Description

[Technical field]

[0001] The present invention relates to a weight moving device and a weight elevation adjustment method. [Background technology]

[0002] Patent Document 1 is a background art in the technical field of this invention that relates to maintenance of wind power generators. Patent Document 1 describes a heavy object positioning device and a heavy object positioning method. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-163119 A Summary of the Invention [Problem to be solved by the invention]

[0004] A mechanism for positioning a heavy object is described in Patent Document 1. However, the heavy object positioning device in Patent Document 1 does not allow for elevation adjustment in the up-down direction. In particular, in the case of a combined structure in which a shaft is inserted and fixed with a interference between the shaft and the gearbox, and the support structure for the shaft has only one bearing, the shaft cannot be removed from or inserted into the gearbox without damaging it unless it is clamped with a heavy load holding jig and its vertical position adjusted.

[0005] The present invention has been devised in view of the above circumstances, and has an object to provide a heavy object moving device and a heavy object elevation adjustment method that can extract or insert components while suppressing damage to the components. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a heavy object moving device for use in a wind turbine generator comprising a main shaft to which a wind turbine rotor blade and a rotor head are fixed, a gear box which increases the rotational speed of the main shaft, and a nacelle base frame which supports the main shaft and the gear box, and which is used for attaching and detaching the gear box, and which is equipped with a main shaft pressing jig having a support part which supports the main shaft on the nacelle base frame, and a first adjustment part which adjusts the position of the support part in both the left-right direction (Y-axis) and the up-down direction (Z-axis) so as to center the main shaft relative to the gear box. Effect of the Invention

[0007] According to the present invention, it is possible to provide a heavy object moving device and a heavy object elevation adjustment method that can extract or insert components while suppressing damage to the components. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view of the overall configuration of a wind power generator according to a first embodiment of the present invention. [Diagram 2] Right side view of the gearbox installed on the nacelle base frame. [Diagram 3] A top view of the rotor head, main shaft, and gearbox inside the nacelle with the main shaft holding jig attached. [Figure 4A] FIG. [Figure 4B] FIG. 4B is a right side view of the nacelle base frame as seen in the direction of the arrow I in FIG. 4A. [Diagram 5] FIG. 2 is a perspective view of a wind turbine generator from which the rotor head, wind turbine blades, and nacelle have been removed, as viewed obliquely from the front. [Figure 6] A vertical cross-sectional view of the joint between the gearbox and the main shaft. [Figure 7A] FIG. 4 is a perspective view of the shaft holding jig attached to the nacelle base frame, as viewed obliquely from above and in the front. [Figure 7B] FIG. 7B is a front view of the spindle holding jig attached to the nacelle base frame, viewed in the direction of the arrow II in FIG. 7A. [Figure 7C] 7A in the direction of the arrow III [Figure 8A]FIG. 4 is an enlarged view of part IV in FIG. 2 before centering of the joint between the spindle holding jig and the nacelle base frame. [Figure 8B] 4 is an enlarged view of part IV in FIG. 2 in the state of the joint between the spindle holding jig 13 and the nacelle base frame 7 before centering and fixing. [Figure 8C] 8B is an enlarged view of part IV in FIG. 8A as viewed in the direction of arrow V. [Figure 9] FIG. 11 is a right side view of the attachment position of the guide rail relative to the main shaft and gear box of the second embodiment, with the main shaft holding jig attached and fixed to the nacelle base frame. [Figure 10A] FIG. 11 is a perspective view of the nacelle base of the second embodiment, as viewed obliquely from the rear outside. [Figure 10B] FIG. 11 is a perspective view of a nacelle base of a second embodiment, as viewed obliquely from the front inner side. [Figure 11A] FIG. 4 is an overall perspective view of the right guide rail with the right running portion and the mounting portion attached thereto. [Figure 11B] 13 is a perspective view of the right guide rail with the right running portion and the mounting portion attached thereto, as viewed from the inside. FIG. [Figure 11C] An inside view from the side with the right running part and mounting part attached to the right guide rail. [Figure 12A] An overall view of the right-side running section attached to the tip shaft of the right-side gearbox torque arm. [Figure 12B] FIG. 13 is a front view seen from the rear with the right running section attached to the tip shaft of the right speed increaser torque arm. [Figure 13] FIG. 13 is a perspective view of the work process, seen obliquely from the front, of the wind power generator, omitting the rotor head with the main shaft pressing jig attached, the wind turbine rotor blades, and the nacelle. [Figure 14] FIG. 13 is a perspective view of the work process, seen obliquely from the front, of the wind power generator, omitting the rotor head with the main shaft pressing jig attached, the wind turbine rotor blades, and the nacelle. [Figure 15] FIG. 13 is a perspective view of the work process, seen obliquely from the front, of the wind power generator, omitting the rotor head with the main shaft pressing jig attached, the wind turbine rotor blades, and the nacelle. [Figure 16]FIG. 13 is a perspective view of the work process, seen obliquely from the front, of the wind power generator, omitting the rotor head with the main shaft pressing jig attached, the wind turbine rotor blades, and the nacelle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. <<Embodiment 1>> FIG. 1 shows a side view of the overall configuration of a wind power generator 1 according to a first embodiment of the present invention. FIG. 2 shows a right side view of the gearbox 8, the main shaft 9, etc., which are installed on the nacelle base frame 7. FIG. 3 shows a plan view from above of the rotor head 4, the main shaft 9, and the gearbox 8 in the nacelle 3 with the main shaft holding jig 13 attached thereto. In the first embodiment, an example will be described in which the vertical position of the main shaft 9 is adjusted while the main shaft 9 is held down by a main shaft holding jig 13 in order to remove the gearbox 8 alone from the wind power generator 1.

[0010] A wind power generator 1 according to the first embodiment shown in FIG. 1 includes a support 2, a nacelle 3, a rotor head (hub) 4, and a wind turbine rotor blade 5.

[0011] The wind turbine rotor 5 rotates when it receives wind, and converts wind energy into rotational energy. The support 2 is erected on a foundation B and is also called a tower. The support 2 is configured by connecting a plurality of units (for example, three units) in the vertical direction. The support 2 supports a nacelle 3, a rotor head 4, etc. on the foundation B. The nacelle 3 is installed on a unit that is provided at the top of the units that configure the support column 2. Therefore, the nacelle 3 is installed at the upper end of the support column 2.

[0012] The nacelle 3 has a nacelle base frame 7 (see FIG. 2) attached to the upper end of the support 2, and an upper half cover 6 (see FIG. 1) that covers the nacelle base frame 7 from above.

[0013] As shown in FIG. 2, a nacelle base frame 7, a gearbox 8, a main shaft 9, bearings 12, a generator (not shown), and the like are housed within the nacelle 3 shown in FIG. The speed-increasing gear 8 increases the low rotation speed of the wind turbine rotor 5 to a high rotation speed for generating power. The speed-increasing gear 8 is a heavy object weighing, for example, about 20 tons.

[0014] The rotor head 4 is configured to be rotatable about a substantially horizontal rotation axis O1. A plurality of (e.g., three) wind turbine rotor blades 5 are attached radially around the rotation axis O1 to the rotor head 4. With this configuration, the force of the wind hitting the wind turbine rotor blades 5 from the direction of the rotation axis O1 of the rotor head 4 is converted into power that rotates the rotor head 4 around the rotation axis O1. The generator converts the rotational energy of the gearbox 8 into electrical energy.

[0015] <Weight object moving device J and weight object positioning method> Hereinafter, a weight moving device J (see FIG. 2) and a weight positioning method according to the first embodiment will be described. The main shaft pressing jig 13 constituting the heavy load moving device J is a jig that is attached (used) for attaching and detaching the speed increaser 8 when performing maintenance or replacing the speed increaser 8.

[0016] A nacelle base frame (base) 7 shown in FIG. 2 is disposed inside the nacelle 3 (see FIG. 1). FIG. 4A shows a plan view of the nacelle base frame 7, and FIG. 4B shows a right side view of the nacelle base frame 7 as seen in the direction of the arrow I in FIG. 4A. 2 is a frame (strength member) for mounting the speed-up gear 8, the wind turbine rotor 5 (see FIG. 1), the nacelle 3, and the rotor head 4. The main shaft holding jig 13 of the first embodiment is attached to the nacelle frame 7 when the speed-up gear 8 is attached or detached.

[0017] The nacelle base frame 7 is formed so that the side (front side) where the wind turbine rotor blades 5 (see FIG. 1) are attached is higher, and the side (rear side) where the nacelle 3 and the gearbox 8 are attached is lower. The nacelle base frame 7 has a pair of side plates 7s1, 7s2 to which other members are attached, and a girder plate 7s3 that connects the pair of side plates 7s1, 7s2. The gearbox 8 is attached to the nacelle base frame 7 at a gearbox attachment position 7g (see FIG. 4A). When the gearbox 8 is removed from the wind power generator 1, the main shaft holding jig 13 is attached to the main shaft holding jig attachment position 7s of the nacelle base frame 7. By using the main shaft holding jig 13, it is possible to prevent the rotor head 4, wind turbine rotor blades 5, main shaft 9, etc. from falling when the speed increaser 8 is removed.

[0018] As shown in FIG. 3, a bearing 12 that suppresses anything other than rotation is attached to a main shaft 9 that extends from the speed increaser 8 to the rotor head 4 side.

[0019] The gearbox 8 in the wind power generator 1 is detached as follows. As shown in FIG. 2, when the gearbox 8 is removed or attached, a main shaft holding jig 13 is attached to the nacelle base frame 7 at a main shaft holding jig attachment position 7s in order to support the main shaft 9.

[0020] The main shaft 9 is fixed to the nacelle base frame 7 shown in Fig. 2 via a main shaft holding jig 13. This prevents the main shaft 9 from falling off the nacelle 3. Then, the nacelle upper half cover 6 (see FIG. 1) is removed to release the connection between the main shaft 9 and the generator (not shown) and the gearbox 8. By supporting the main shaft 9 with a main shaft holding jig 13, it is possible to replace the gearbox 8 without having to remove the main shaft 9 and rotor head 4 from the nacelle base frame 7.

[0021] <Fitting structure between the gearbox 8 and the main shaft 9> The speed increaser 8 and the main shaft 9 are fixed by fitting as described below. FIG. 5 shows a perspective view of the wind power generator 1 from which the rotor head 4, the wind turbine rotor blades 5, and the nacelle upper half cover 6 have been removed, as viewed obliquely from the front.

[0022] As shown in FIG. 5, the gearbox 8 is fixed to the nacelle base frame 7 using a gearbox torque arm 17 and a gearbox mounting member 19 by bolting (not shown). FIG. 6 shows a vertical cross-sectional view of a joint portion K1 between the gearbox 8 and the main shaft 9. The wind turbine rotor blades 5 and the rotor head 4 are fixed to the main shaft 9. The speed increaser 8 is fitted to the main shaft 9 at a fitting portion K1. The main shaft 9 is fitted about 50 cm inside the speed increaser 8 at the fitting portion K1. Therefore, when replacing the speed increaser 8, it is necessary to pull out the speed increaser 8 from the main shaft 9. The rotor section having the wind turbine rotor blades 5 and the rotor head 4 and the main shaft 9 are supported by the gearbox 8 at the engagement portion K1 and the bearing 12 while receiving the load.

[0023] <Positioning of the main shaft 9 relative to the speed increaser 8 by the main shaft holding jig 13> As described above, the main shaft 9 and the speed increaser 8 are fixed together by fitting together at the mating portion K1. Therefore, in the method for adjusting the elevation of a heavy object in which the step-up gear 8 is detached, the main shaft 9 is centered relative to the step-up gear 8. The main shaft holding jig 13 supports the main shaft 9, to which the wind turbine rotor blades 5 and the like are fixed, at a support portion 13s (see FIG. 7A) on the nacelle base frame 7. When removing the gearbox 8 fixed to the main shaft 9 at the engagement portion K1, in order to prevent damage to the main shaft 9 and the gearbox 8, the main shaft 9 is centered in advance. Thereafter, the step-up gear 8 is removed from the main shaft 9 and the step-up gear 8 is fitted to the main shaft 9.

[0024] Specifically, first, the main shaft 9 to which the wind turbine rotor blades 5 and the like are fixed is supported by the main shaft pressing jig 13, and centering is performed with respect to the gearbox 8. Thereafter, the main shaft holding jig 13 supporting the main shaft 9 is fixed to the nacelle base frame 7. Then, the gearbox 8 is moved parallel to the mating part K1 using a hydraulic jack or the like to release the engagement between the main shaft 9 and the gearbox 8. Thereafter, the gearbox 8 is lowered to the ground (foundation B (see FIG. 1)) using a crane (not shown), and maintenance, replacement, etc. of the gearbox 8 are performed.

[0025] The main shaft holding jig 13 is fixed to the nacelle base frame 7 and bears the load of the main shaft 9. As a result, even if the gearbox 8 is removed and the weight of the gearbox 8 is eliminated, the main shaft 9 is supported by the nacelle base frame 7 together with the main shaft holding jig 13 and will not fall.

[0026] <Centering of the main shaft 9 with respect to the speed increaser 8> The centering of the main shaft 9 supported by the main shaft holding jig 13 with respect to the speed increaser 8 will be described. <Attachment of the spindle holding jig 13 to the nacelle base frame 7> FIG. 7A shows a perspective view of the state in which the main shaft holding jig 13 is attached to the nacelle base frame 7, as viewed obliquely from above and in the front. Fig. 7B shows a front view of the spindle holding jig 13 attached to the nacelle base frame 7, as seen in the direction of the arrow II in Fig. 7A. Fig. 7C shows a view as seen in the direction of the arrow III in Fig. 7A. The main shaft holding jig 13 has the following configuration for mounting the main shaft 9 to the nacelle base frame 7.

[0027] The main shaft holding jig 13 is roughly divided into six parts: a main body starboard side member 13a, a main body port side member 13b, a starboard frame joint inner member 13c, a starboard frame joint outer member 13d, a port frame joint inner member 13e, and a port frame joint outer member 13f. The above-mentioned components (13a, 13b, 13c, 13d, 13e, 13f) are joined by bolts and nuts (not shown).

[0028] As shown in Figures 7B and 7C, the connection between the shaft holding jig 13 and the nacelle base frame 7 is shaped to embrace the nacelle base frame 7 with the starboard frame connection portion inner member 13c and the starboard frame connection portion outer member 13d, and the port frame connection portion inner member 13e and the port frame connection portion outer member 13f. After the fixing parts (13c, 13d, 13e, 13f) and the nacelle base frame 7 are joined together, they are attached to the main body parts (13a, 13b) of the other main shaft holding jig 13.

[0029] As shown in Figures 7B and 7C, the connection between the starboard frame connection inner member 13c and the starboard frame connection outer member 13d is supported on the nacelle base frame 7 by push bolts b1 (first adjustment part) on the lower, upper, outer and inner sides of the nacelle base frame 7. Similarly, the connection between the port frame connection inner member 13e and the port frame connection outer member 13f is supported on the nacelle base frame 7 by push bolts b1 (first adjustment part) on the lower, upper, outer and inner sides of the nacelle base frame 7.

[0030] FIG. 8A is a schematic cross-sectional side view showing the state in which the main shaft 9 and the speed increaser 8 are fitted together. At the fitting portion K1 between the main shaft 9 and the gearbox 8, the weight of both the main shaft 9 and the gearbox 8 is applied, so that the main shaft 9 is in contact with the upper end portion 8a1 of the fitting hole 8a of the gearbox 8 (the main shaft 9 shown by the dotted line in Figure 8A). Therefore, when removing the gearbox 8, the main shaft 9 must be prevented from sliding against the fitting hole 8a of the gearbox 8 when the gearbox 8 is pulled out from the main shaft 9. For this reason, the main shaft 9 is centered relative to the fitting hole 8a of the gearbox 8. By centering, the main shaft 9 is positioned at the center of the fitting hole 8a of the gearbox 8, as shown by the solid line in Fig. 8A.

[0031] FIG. 8B shows an enlarged view of part IV in FIG. 8A as viewed in the direction of arrow V in a state before centering of the joint part between the main shaft holding jig 13 and the nacelle base frame 7. In FIG. FIG. 8C shows an enlarged view of part IV in FIG. 8A taken in the direction of arrow V in the state of the joint between the spindle holding jig 13 and the nacelle base frame 7 after centering and fixing.

[0032] As shown in FIG. 8B, the inner member 13c and the outer member 13d which form the joint between the shaft holding jig 13 and the nacelle base frame 7 are shaped to embrace the nacelle base frame 7. After the nacelle base frame 7 is joined to the inner member 13c and the outer member 13d, the inner member 13c and the outer member 13d are attached to the jig body (other members of the spindle holding jig 13) using press bolts. An inner member 13c and an outer member 13d of the joint between the shaft holding jig 13 and the nacelle base frame 7 are supported on the nacelle base frame 7 by press bolts of the nacelle base frame 7, respectively.

[0033] As shown in FIG. 8B, the starboard frame joint inner member 13c and the starboard frame joint outer member 13d of the shaft holding jig 13 are fixed to the nacelle base frame 7 using press bolts b1a to b1f, respectively. To adjust the position of the starboard frame joint inner member 13c in the vertical direction, the pressing bolts b1a and b1c are adjusted. To adjust the position of the starboard frame joint outer member 13d in the vertical direction, the pressing bolts b1d and b1f are adjusted.

[0034] To adjust the horizontal positions of the starboard frame joint inner member 13c and the starboard frame joint outer member 13d, the push bolts b1b and b1e are adjusted, respectively. In this way, by adjusting the horizontal position of the starboard frame joint inner member 13c and the starboard frame joint outer member 13d, it is possible to adjust the positions in the left-right direction (Y axis) and the fore-aft direction (X axis). The position adjustments of the left side port frame joint inner member 13e and the left side port frame joint outer member 13f connected to the nacelle base frame 7 of the shaft holding jig 13 are performed in the same manner.

[0035] By adjusting the above-mentioned pressing bolts b1a to b1f, it is possible to fine-tune and center the position of the main shaft 9 supported by the main shaft holding jig 13 relative to the nacelle base frame 7 in any of the forward / backward direction (X-axis), left / right direction (Y-axis), and up / down direction (Z-axis) relative to the gearbox 8. As a result, when the speed-increasing gear 8 is detached from the main shaft 9, the main shaft 9 does not rub against the fitting hole 8a (see FIG. 8A) of the speed-increasing gear 8 and can be pulled out and inserted without being damaged. According to the configuration of embodiment 1, by holding down the main shaft 9 and enabling adjustment in the left-right and up-down directions, the main shaft 9 can be pulled out and inserted from the gearbox 8 without damaging the fitting hole 8a (see FIG. 8A) of the gearbox 8.

[0036] <<Embodiment 2>> In the above-mentioned first embodiment, the mechanism of the main shaft holding jig 13 that determines and fixes the position of the main shaft 9 connected to the speed increaser 8 is described. In the second embodiment, an example will be described in which the gearbox 8 in the nacelle 6 (see FIG. 1) can be pulled out and inserted in a direction parallel to the main shaft 9 so as not to slide in the fitting hole 8a (see FIG. 8A) of the gearbox 8. When used in conjunction with the configuration of embodiment 1, embodiment 2 provides a guide device that moves the gear box 8 parallel to the direction of the main shaft 9, enabling the gear box 8 to be pulled out of and inserted into the main shaft 9 without damaging the main shaft 9 or the gear box 8.

[0037] In order to solve the above problems, in the second embodiment, as shown in Figs. 11A to 11C described later, there are provided guide rails 14 in the up-down and left-right directions which are fixed to the nacelle base frame 7, a running section 16 for moving parallel to the guide rails 14, and an attachment section 15 for attaching the running section 16 to a torque arm tip shaft 18. A specific example will be described below.

[0038] As shown in Fig. 5, a gearbox torque arm 17 is attached to the gearbox 8 as a member for fixing the gearbox 8 to the nacelle base frame 7. Torque arm end shafts 18 are fixed to the front and rear of the gearbox torque arm 17. The gearbox 8 is fixed to the nacelle base frame 7 by fitting the torque arm end shafts 18 into fitting holes 19a of a gearbox mounting member 19 attached to the nacelle base frame 7.

[0039] Fig. 9 shows a right side view of the attachment position T1 of the guide rail 14 with respect to the main shaft holding jig 13 attached to the main shaft 9 and the gear box 8 of the second embodiment and fixed to the nacelle base frame 7. Fig. 9 is a view of the main shaft 9 and the gear box 8 with the main shaft holding jig 13 attached and fixed to the nacelle base frame 7 as viewed from the right side. As described in the first embodiment, the main shaft holding jig 13 fixes the main shaft 9 in a state where the main shaft 9 is aligned with the gearbox 8. This prevents the main shaft 9 together with the bearing 12 from falling off the nacelle base frame 7 downward.

[0040] Then, the nacelle upper half cover 6 (see FIG. 1) is removed to release the connection between the main shaft 9 and the generator (not shown) and the gearbox 8. This makes the gearbox 8 a separate entity, and makes it possible to remove the gearbox 8 for maintenance and replacement. This eliminates the need to remove the main shaft 9 and rotor head 4 (see FIG. 1) when replacing the gearbox 8, as was conventionally done. However, when installing or removing the gearbox 8, as described in embodiment 1, a part of the main shaft 9 is inserted into the gearbox 8 as shown in FIG. 8A, so that the gearbox 8 needs to be moved parallel to the fixed main shaft 9 so as not to hit it.

[0041] Figures 10A and 10B show a state in which the right guide rail 14 of embodiment 2 is attached to the nacelle base frame 7. Figure 10A shows a perspective view of the nacelle base frame 7 of embodiment 2 as seen diagonally from the rear outside, and Figure 10B shows a perspective view of the nacelle base 7 of embodiment 2 as seen diagonally from the front inside. Note that Figures 10A and 10B show views of the nacelle base frame 7 cut at the center from left to right. The guide rail 14 is a member used for removing the speed-increasing gear 8 from the main shaft 9 and for inserting the speed-increasing gear 8 into the main shaft 9 .

[0042] The guide rail 14 has a shape in which a base portion 14a for guiding left and right and an upper portion 14b for guiding up and down are integrally formed.

[0043] 11A, 11B, and 11C are perspective views showing the state in which the right-side running section 16 and the right-side mounting section 15 are attached to the nacelle base frame 7. Fig. 11A shows an overall view, Fig. 11B shows an inside view, and Fig. 11C shows an inside view seen from directly to the side. The positions of the left and right guide rails 14 are adjusted with fixing bolts b2 or the like so that the gearbox 8 moves in parallel along the main shaft 9, and the left and right guide rails 14 are fixed to the nacelle base frame 7.

[0044] The hole in the guide rail 14 through which the bolt b2 (second adjustment portion) is inserted has a diameter larger than the diameter of the bolt b2, and is adjustable in the horizontal direction (front-back and left-right directions). 11C, a height adjustment bolt b3 (second adjustment part) is fixed to the rear lower part of the guide rail 14. A height adjustment member 7t fixed to the nacelle base frame 7 is threaded with a female thread that screws into the male thread of the height adjustment bolt b3. In addition, a height adjustment washer 14w is provided at the lower part of the guide rail 14.

[0045] With this configuration, the height of the guide rail 14 can be adjusted relative to the nacelle base frame 7 by rotating the height adjustment bolt b3 or by changing the number and thickness of the height adjustment washers 14w. The mounting portion 15, which is integral with the running portion 16 that moves the speed-increasing gear 8, is provided with a mounting portion fitting hole 15a into which the torque arm tip shaft 18 is fitted.

[0046] 11B, a cam follower 16f, which is a bearing with a shaft, is attached to the running part 16 in the vertical and horizontal directions and rolls on the guide rail 14. The rolling of the cam follower 16f enables the running part 16, to which the speed increaser 8 is fixed, to run on the guide rail 14 in parallel with the main shaft 9.

[0047] Figures 12A and 12B show a state in which the torque arm end shaft 18 of the gearbox 8 and the running part 16 are integrated via the mounting part 15. Figures 12A and 12B show an overall view and a front view seen from the front in a state in which the right running part 16 is attached to the torque arm end shaft 18 of the right gearbox torque arm 17.

[0048] To perform maintenance or replace the gearbox 8 shown in FIG. 5, the gearbox mounting member 19 fixed to the gearbox 8 and the nacelle base frame 7 is removed from the torque arm end shaft 18 of the gearbox torque arm 17. Then, by fitting the torque arm end shaft 18 of the gearbox 8 into the mounting portion fitting hole 15a (see Figure 11A) of the mounting portion 15, the gearbox 8 becomes able to move parallel to the guide rail 14 together with the running portion 16.

[0049] The configuration of the guide rail 14, mounting portion 15, and running portion 16 allows the speed increaser 8 to move parallel to the main shaft 9 along the guide rail 14 via the running portion 16. When removing the speed increaser 8 from the main shaft 9, the speed increaser 8 can be attached to and removed from the main shaft 9 without causing damage.

[0050] <Removal process of gearbox 8> Next, the process of removing the gearbox 8 from the main shaft 9 will be described. 13 to 16 show the steps of removing the gearbox 8 from the main shaft 9.

[0051] FIG. 13 shows a perspective view of the wind power generator F, from which the rotor head 4 to which the main shaft pressing jig 13 is attached, the wind turbine rotor blades 5, and the nacelle 6 are omitted, as viewed obliquely from the front. In a first operation step, as shown in FIG. 13, the spindle pressing jig 13 is attached using pressing bolts b1a to b1f (see FIGS. 8B and 8C). As a second work step, as shown in FIG. 14, the spindle holding jig 13 is adjusted up and down, left and right, and front and rear using pressure bolts b1a to b1f (see FIG. 8B and FIG. 8C), and moved so that the load of the joint K1 (see FIG. 8A) between the gearbox 8 and the spindle 9 is applied to the spindle holding jig 13. 13 and 14, in FIG. 13, the torque arm end shaft 18 is fitted into the fitting hole 19a of the speed-increasing gear mounting member 19.

[0052] In a third work step, the speed-up gear mounting member 19 (see FIG. 13) fixed to the speed-up gear torque arm 17 is removed. As a fourth work step, as shown in FIG. 15, the guide rail 14 is attached to the nacelle base frame 7 (see FIG. 10A and FIG. 10B), and as shown in FIG. 12A and FIG. 12B, the mounting portion fitting hole 15a of the mounting portion 15 is attached to the torque arm tip shaft 18. In the fifth work step, the guide rail 14 and the running portion 16 are centered by adjusting the fixing bolt b2, the height adjustment bolt b3, and the height adjustment washer 14w (see Figs. 11B and 11C). This completes the preparation for extracting the gearbox 8.

[0053] In a sixth work step, as shown in Fig. 16, the gearbox 8 is pulled out by the hydraulic jack 20. The engagement portion K1 (see Fig. 8A) of the main shaft 9 is completely pulled out, and the gearbox 8 is removed. In a seventh work step, the gearbox 8 is lifted up by a crane (not shown) and lowered.

[0054] According to the configuration of the second embodiment, the guide rail 14, mounting portion 15, and running portion 16 of the guide mechanism that is movable parallel to the direction of the main shaft 9 are attached to the nacelle base frame 7. Then, by adjusting at least the left-right and up-down directions, the gearbox 8 can be pulled out and inserted from the main shaft 9 while preventing damage thereto. This allows maintenance, replacement, etc. of the gearbox 8 to be performed by removing the gearbox 8 alone. By centering the main shaft 9, the gearbox 8 can be pulled out and inserted from the main shaft 9 without being damaged.

[0055] The present invention is not limited to the above-mentioned embodiment, but includes various modified examples. For example, the above-mentioned embodiment has been described in detail to easily explain the present invention, and is not necessarily limited to those having all the configurations described. It is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0056] 1. Wind turbine 5. Windmill rotor blades 4 Rotor Head 9 Main shaft 8 Gearbox 7 Nacelle base frame 13 Spindle holding jig (heavy load moving device) 13s Support part (heavy object moving device) 14 Guide rail (guide rail section, heavy load moving device) 14w Height adjustment washer (second adjustment part) 15 Mounting part (heavy load moving device) 16 Running unit (heavy load moving device) b1, b1a, b1b, b1eb1cb1d, b1f Push bolt (first adjustment part, heavy load moving device) b2 Fixing bolt (second adjustment part) b3 Height adjustment bolt (second adjustment part) K1 mating part

Claims

1. A heavy load moving device for use in a wind power generator including a main shaft to which a wind turbine rotor blade and a rotor head are fixed, a gearbox that increases the rotational speed of the main shaft, and a nacelle base frame that supports the main shaft and the gearbox, the heavy load moving device being used for attaching and detaching the gearbox, a support portion that supports the main shaft on the nacelle base frame; and a first adjustment portion that adjusts the position of the support portion in both the left-right direction and the up-down direction so as to center the main shaft relative to the speed-up gear. A heavy object moving device characterized by the above.

2. The weight moving device according to claim 1, A guide rail portion fixed to the nacelle base frame; a mounting portion that is attached to the speed increaser; a running section that is formed integrally with the mounting section and moves in the front-rear direction together with the speed increaser along the guide rail section, The speed-increasing device is configured to move rearward along the guide rail portion so as to be pulled out from the main shaft by the traveling portion, and to move forward along the guide rail portion so as to be fitted onto the main shaft by the traveling portion. A heavy object moving device characterized by the above.

3. The weight moving device according to claim 2, A second adjustment unit is provided to adjust the positions of the guide rail unit and the running unit. A heavy object moving device characterized by the above.

4. A method for adjusting the elevation of a weight using a weight moving device for a wind power generator including a main shaft to which a wind turbine rotor blade and a rotor head are fixed, a speed increaser for increasing the rotation speed of the main shaft, and a nacelle base frame for supporting these, attaching a spindle holding jig to the nacelle base frame from above the spindle; adjusting the load applied to the joint between the speed increaser and the main shaft so that it is supported by the main shaft holding jig; removing a fixing portion of the gearbox that is fixed to the nacelle base frame; Attaching a guide rail portion to the nacelle base frame; and attaching a running section that moves along the guide rail section to the speed increaser.

5. The method for adjusting the elevation of a weight according to claim 4, A method for adjusting elevation of a heavy object, comprising a step of adjusting the guide rail portion and the running portion so that the speed increaser moves parallel to the main shaft by the running portion.

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