Staggered hole correction method, device and equipment for flange of wind turbine generator and medium

Abstract

The invention discloses a method, a device and equipment for correcting staggered holes of a flange of a wind turbine generator and a medium, and belongs to the technical field of wind power. The method for correcting the staggered holes of the flanges of the wind turbine generator comprises the steps that under the condition that the wind turbine generator is shut down and an impeller is locked, individual bolts in a plurality of bolts connecting a hub flange and a rotating shaft flange are detached, and the staggered hole directions of the hub flange and the rotating shaft flange are determined according to screw holes corresponding to the detached bolts; the remaining bolts for connecting the hub flange and the rotating shaft flange are loosened, and then preset fastening torque is applied for fastening; and the impeller is controlled to rotate according to the target direction corresponding to the hole staggering direction under the acting force of wind until the hole staggering distance between the hub flange and the screw hole corresponding to the disassembled bolt and the hole staggering distance between the rotating shaft flange and the screw hole corresponding to the disassembled bolt are smaller than the preset error distance. According to the embodiment of the invention, the safety of the wind turbine generator can be improved.

Description

Technical Field

[0001] This application belongs to the field of wind power technology, and in particular relates to a method, device, equipment and medium for correcting misaligned holes in the flange of a wind turbine. Background Technology

[0002] A wind turbine generator set may include major components such as an impeller, transmission system, generator, and gearbox. These major components are connected by high-strength bolts. The impeller and the generator shaft are connected by a flange. Wind blows the impeller to rotate, which in turn drives the shaft to rotate, thereby driving the generator or gearbox.

[0003] During the installation or later operation of wind turbines, slippage may occur between the flange faces of the rotor hub and the generator shaft flange, causing misalignment between the bolt holes of the hub flange and the shaft flange. After a period of operation with this misalignment, the bolts in the bolt holes will experience fatigue damage. When the fatigue damage exceeds the bolt's fatigue life, fatigue fracture will occur. This can also lead to gaps appearing between the rotor and shaft flanges, severely impacting the safety of the wind turbine. Summary of the Invention

[0004] This application provides a method, apparatus, equipment, and medium for correcting misaligned holes in the flanges of wind turbine generators, which can improve the safety of wind turbine generators.

[0005] In a first aspect, embodiments of this application provide a method for correcting misaligned holes in the flange of a wind turbine generator set, which is applied to the wind turbine generator set. The wind turbine generator set includes an impeller and a generator shaft, and the impeller hub and the shaft are fixedly connected by a hub flange, a shaft flange and bolts.

[0006] The method includes: with the wind turbine unit stopped and the rotor locked, removing individual bolts from among the multiple bolts connecting the hub flange and the shaft flange; determining the misalignment direction of the hub flange and the shaft flange based on the bolt holes corresponding to the removed bolts; loosening the remaining bolts connecting the hub flange and the shaft flange, and then applying a preset tightening torque to tighten them; controlling the rotor to rotate in the target direction corresponding to the misalignment direction under the force of the wind, until the misalignment distance between the hub flange and the shaft flange and the bolt holes corresponding to the removed bolts is less than a preset error distance.

[0007] In some possible embodiments, the misalignment direction includes a first direction and a second direction; the first direction indicates that, in the direction of the wind turbine tower, the axis of the bolt hole of the pivot flange is higher than the axis of the bolt hole of the hub flange; the second direction indicates that, in the direction of the wind turbine tower, the axis of the bolt hole of the hub flange is higher than the axis of the bolt hole of the pivot flange.

[0008] In some possible embodiments, when the misalignment direction is the first direction, the target direction is a clockwise direction with the direction from the shaft flange to the hub flange as the axis; when the misalignment direction is the second direction, the target direction is a counterclockwise direction with the direction from the shaft flange to the hub flange as the axis.

[0009] In some possible embodiments, controlling the impeller to rotate in a target direction corresponding to the misalignment direction under the action of wind includes: determining the target direction corresponding to the misalignment direction based on the misalignment direction; acquiring the wind direction information of the wind turbine; releasing the impeller lock based on the wind direction information; controlling the impeller to yaw to reach the target yaw position, so that the impeller rotates in the target direction under the action of the wind in the wind direction represented by the wind direction information.

[0010] In some possible embodiments, before controlling the impeller to rotate in the target direction corresponding to the misalignment direction under the force of the wind, the method further includes: inserting a guide bar into the screw hole corresponding to the disassembled bolt along the direction from the shaft flange to the hub flange. The guide bar includes a straight structure and an inclined structure connected together. Along the length of the guide bar, the diameter of the cross-section of the inclined structure gradually decreases. A part of the inclined structure is inserted into the screw hole of the hub flange, so that the minimum distance between the inclined structure and the hole wall of the screw hole of the hub flange is less than or equal to a preset distance.

[0011] In some possible embodiments, controlling the impeller to rotate in a target direction corresponding to the misalignment direction under the force of wind until the misalignment distance between the hub flange and the shaft flange and the bolt hole corresponding to the disassembled bolt is less than a preset error distance includes: controlling the impeller to rotate in the target direction under the force of wind for a preset time according to the misalignment direction; if the minimum distance between the inclined structure and the bolt hole wall of the hub flange is greater than the preset distance, applying an impact force to the guide bar in the direction from the shaft flange to the hub flange, so that the minimum distance between the inclined structure and the bolt hole wall of the hub flange is less than or equal to the preset distance; again controlling the impeller to rotate in the target direction under the force of wind for a preset time until the straight structure extends into the bolt hole of the hub flange.

[0012] In some possible embodiments, the remaining bolts connecting the hub flange and the shaft flange are divided into N bolt groups, each bolt group including at least one remaining bolt, and the bolts in each bolt group are spaced apart on the hub flange and the shaft flange, where N is an integer greater than 1.

[0013] Loosen the remaining bolts connecting the hub flange and the shaft flange, and then apply a preset tightening torque to tighten them. This includes: loosening the remaining bolts connecting the hub flange and the shaft flange in N steps, and then applying a preset tightening torque, loosening and tightening one bolt group at a time.

[0014] Secondly, this application provides a misalignment correction device for a flange of a wind turbine, which is applied to a wind turbine. The wind turbine includes an impeller and a generator shaft, and the hub and the shaft are fixedly connected by a hub flange, a shaft flange and bolts.

[0015] The device includes: a misalignment direction determination module, used to remove individual bolts from a plurality of bolts connecting the hub flange and the shaft flange when the wind turbine is stopped and the impeller is locked, and to determine the misalignment direction of the hub flange and the shaft flange based on the bolt holes corresponding to the removed bolts; a bolt processing module, used to loosen the remaining bolts connecting the hub flange and the shaft flange, and then apply a preset tightening torque to tighten them; and an impeller control module, used to control the impeller to rotate in a target direction corresponding to the misalignment direction under the force of the wind, until the misalignment distance between the hub flange and the shaft flange and the bolt holes corresponding to the removed bolts is less than a preset error distance.

[0016] Thirdly, embodiments of this application provide a misalignment correction device for a flange of a wind turbine, comprising: a processor and a memory storing computer program instructions; the processor executes the computer program instructions to implement the misalignment correction method for a flange of a wind turbine in the first aspect.

[0017] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the method for correcting misaligned flanges of a wind turbine generator as described in the first aspect.

[0018] This application provides a method, apparatus, equipment, and medium for correcting misaligned holes in the flanges of a wind turbine. With the wind turbine stopped and the impeller locked, individual bolts on the hub flange and shaft flange are removed. The misalignment direction of the hub flange and shaft flange is determined based on the bolt holes corresponding to the removed bolts. The remaining bolts are loosened and then tightened again to prevent gaps between the hub flange and shaft flange. The impeller is controlled to rotate naturally in the target direction corresponding to the misalignment direction under wind force, causing relative slippage between the hub flange and shaft flange during impeller rotation. This completes the misalignment correction, eliminates the misalignment of the bolt holes in the hub flange and shaft flange, reduces or even avoids bolt fatigue fracture and gaps between the impeller and shaft, and improves the safety of the wind turbine. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1A partial schematic diagram of an example of a wind turbine provided in an embodiment of this application;

[0021] Figure 2 A flowchart illustrating a method for correcting misaligned holes in a flange of a wind turbine generator provided in an embodiment of this application;

[0022] Figure 3 A schematic diagram illustrating an example of a misaligned hole direction provided in an embodiment of this application, where the misalignment direction is a first direction;

[0023] Figure 4 A cross-sectional view of a screw hole in an example where the misalignment direction is a first direction, provided in an embodiment of this application;

[0024] Figure 5 A schematic diagram illustrating an example of a misaligned hole direction in a second direction provided in an embodiment of this application;

[0025] Figure 6 A cross-sectional view of a screw hole in an example where the misalignment direction is a first direction, provided in an embodiment of this application;

[0026] Figure 7 A schematic diagram illustrating an example of the distribution of bolt assemblies provided in an embodiment of this application;

[0027] Figure 8 A schematic diagram illustrating an example of correcting screw hole misalignment during impeller rotation, as provided in an embodiment of this application.

[0028] Figure 9 A flowchart of a method for correcting misaligned holes in a flange of a wind turbine provided in another embodiment of this application;

[0029] Figure 10 This is a schematic diagram illustrating an example of inserting a guide rod into a screw hole according to an embodiment of this application;

[0030] Figure 11 This is a schematic diagram illustrating an example of inserting a guide rod into a screw hole according to an embodiment of this application;

[0031] Figure 12 A flowchart illustrating the process for correcting misaligned holes in the flange of a wind turbine generator provided in this embodiment;

[0032] Figure 13 A schematic diagram of the structure of a misalignment correction device for a wind turbine flange provided in an embodiment of this application;

[0033] Figure 14 This is a schematic diagram of the structure of a misalignment correction device for a wind turbine flange provided in an embodiment of this application. Detailed Implementation

[0034] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0035] A wind turbine generator set includes large components such as an impeller, transmission system, generator, and gearbox, all connected by high-strength bolts. The impeller and generator shaft are connected via flanges. Wind drives the impeller to rotate, which in turn drives the shaft, thus rotating the generator or gearbox. During installation or operation, slippage can occur between the flanges of the impeller hub and the generator shaft, causing misalignment between the bolt holes on the hub flange and the shaft flange. After a period of operation, the bolts in these misaligned bolt holes will experience fatigue damage. If this damage exceeds the bolt's fatigue life, fatigue fracture will occur, potentially leading to a gap between the impeller and shaft, severely compromising the turbine's safety. Since the impeller is very heavy (around 80 tons), misalignment requires lifting and correcting it using a crane. However, using a crane is complex, involving crane access and road construction, resulting in low efficiency and high cost for correcting misalignment.

[0036] Figure 1 A partial schematic diagram of an example of a wind turbine provided in an embodiment of this application, as shown below. Figure 1 As shown, the wind turbine includes an impeller and a generator shaft 11. The impeller hub 12 is fixedly connected to the shaft via a hub flange 13, a shaft flange 14, and bolts. Bolts pass through bolt holes 131 in the hub flange 13 and 141 in the shaft flange 14. For ease of illustration, the bolts are not shown in the enlarged area. If the bolt holes 131 in the hub flange 13 and 141 in the shaft flange 14 are misaligned, it is considered a misalignment.

[0037] This application provides a method, apparatus, equipment, and medium for correcting misaligned flanges in wind turbine generators. When misalignment occurs, the bolts connecting the hub flange of the impeller hub and the shaft flange of the shaft are loosened. Based on the direction of the misalignment, the impeller is rotated by wind in the natural environment. During the impeller's rotation, the hub flange and shaft flange slip relative to each other, thus correcting the misalignment. This eliminates the misalignment of the bolt holes in the hub flange and shaft flange, reducing or even preventing bolt fatigue fracture and gaps between the impeller and shaft, thereby improving the safety of the wind turbine generator. Furthermore, this process does not require a crane, significantly reducing the time spent on correction, improving efficiency, and lowering costs.

[0038] The following describes the method, device, equipment, and medium for correcting misaligned flanges of wind turbine units provided in this application.

[0039] The first aspect of this application provides a method for correcting misaligned holes in the flanges of wind turbine generators. This method can be applied to wind turbine generators, and the specific details of the wind turbine generators can be found above, so they will not be repeated here. The method for correcting misaligned holes in the flanges of wind turbine generators can be performed by misaligned hole correction devices or equipment for wind turbine generator flanges, and is not limited thereto. Figure 2 A flowchart of a method for correcting misaligned holes in a wind turbine flange according to an embodiment of this application is shown below. Figure 2 As shown, the method for correcting misaligned holes in the flange of the wind turbine may include steps S201 to S203.

[0040] In step S201, with the wind turbine unit stopped and the impeller locked, individual bolts among the multiple bolts connecting the hub flange and the shaft flange are removed, and the misalignment direction of the hub flange and the shaft flange is determined according to the bolt holes corresponding to the removed bolts.

[0041] Before correcting misaligned holes in a wind turbine, the turbine must be shut down, and the locking pins must be engaged to lock the rotor, ensuring safety for subsequent operations. With the turbine shut down and the rotor locked, individual bolts connecting the hub flange and shaft flange can be removed; for example, one or two bolts can be removed. The misalignment direction is determined by the relative positions of the bolt holes on the hub flange and shaft flange corresponding to the removed bolts. This can be achieved by capturing images of the bolt holes using a pre-set camera and determining the direction based on their relative positions; alternatively, it can be determined by observing the relative positions of the bolt holes on the hub flange and shaft flange. The specific method for determining the misalignment direction is not limited here.

[0042] In some examples, the misalignment direction includes a first direction and a second direction. The first direction indicates that, in the direction of the wind turbine tower, the axis of the bolt hole of the shaft flange is higher than the axis of the bolt hole of the hub flange. The second direction indicates that, in the direction of the wind turbine tower, the axis of the bolt hole of the hub flange is higher than the axis of the bolt hole of the shaft flange. For example, Figure 3 This is a schematic diagram illustrating an example of a misaligned hole direction provided in an embodiment of this application, where the misalignment direction is a first direction. Figure 3 A view of the wind turbine from the nacelle towards the rotor, such as Figure 3 As shown, in the direction of the tower, the axis of the bolt hole 141 of the rotating flange 14 is higher than the axis of the bolt hole 131 of the hub flange 13. The misalignment direction is the first direction because the hub flange 13 and the rotating flange 14 are misaligned and, in the direction of the tower, the axis 142 of the rotating flange 14 is higher than the axis 132 of the hub flange 13. In other words, in the direction of the tower, the upper edge of the rotating flange 14 is higher than the upper edge of the hub flange 13. Correspondingly, Figure 4 A cross-sectional view of a screw hole in an example where the misalignment direction is a first direction, as provided in the embodiments of this application, is shown below. Figure 3 and Figure 4 As shown, in the direction of the tower, the axis 142 of the rotating flange 14 is higher than the axis 132 of the hub flange 13. For example, Figure 5 This is a schematic diagram illustrating an example of a misaligned hole direction provided in an embodiment of this application, where the misalignment direction is a second direction. Figure 5 A view of the wind turbine from the nacelle towards the rotor, such as Figure 5 As shown, in the direction of the tower, the axis 132 of the bolt hole 131 of the hub flange 13 is higher than the axis 142 of the bolt hole 141 of the shaft flange 14. The misalignment direction is the second direction because the hub flange 13 and the shaft flange 14 are misaligned and the axis of the hub flange 13 is higher than the axis of the shaft flange 14 in the direction of the tower. In other words, in the direction of the tower, the upper edge of the hub flange 13 is higher than the upper edge of the shaft flange 14. Correspondingly, Figure 6 A cross-sectional view of a screw hole in an example where the misalignment direction is a first direction, as provided in the embodiments of this application, is shown below. Figure 5 and Figure 6 As shown, in the direction of the tower, the axis 132 of the hub flange 13 is higher than the axis 142 of the shaft flange 14.

[0043] In step S202, the remaining bolts connecting the hub flange and the shaft flange are loosened, and then a preset tightening torque is applied to tighten them.

[0044] Loosen the remaining bolts, ensuring they remain in the bolt holes of both the hub flange and the shaft flange. For example, loosen them until the bolt washers can rotate freely, ensuring the gap between the hub flange and the shaft flange is less than the opening distance; that is, prevent the hub flange and shaft flange from opening. After loosening the remaining bolts, apply a relatively small tightening torque to secure them, such as 100 N·m.

[0045] In some examples, the remaining bolts connecting the hub flange and the shaft flange are divided into N bolt groups. Each bolt group includes at least one remaining bolt, and the bolts in each group are spaced apart on the hub flange and the shaft flange, where N is an integer greater than 1. The remaining bolts connecting the hub flange and the shaft flange can be loosened in N steps, and then a preset tightening torque is applied. One bolt group is loosened and tightened at a time. The bolts in each bolt group are spaced apart on the hub flange and the shaft flange, avoiding a large number of bolts being placed adjacent to each other in the same bolt group. This prevents a large number of adjacent bolts from being loosened at once during the loosening process, avoiding gaps between the hub flange and the shaft flange, and ensuring the safety of the loosening and tightening processes. For example, Figure 7 A schematic diagram illustrating an example of the distribution of bolt groups provided in an embodiment of this application, as shown below. Figure 7 As shown, the bolts of the hub flange and the shaft flange can be divided into two bolt groups. The bolt 15 represented by the solid circle belongs to one bolt group, and the bolt 15 represented by the dashed circle belongs to another bolt group. The bolt 15 represented by the solid circle can be loosened and then tightened first, and then the bolt 15 represented by the dashed circle can be loosened and then tightened.

[0046] In step S203, the impeller is controlled to rotate in the target direction corresponding to the misalignment direction under the action of the wind until the misalignment distance between the hub flange and the shaft flange and the bolt hole corresponding to the disassembled bolt is less than the preset error distance.

[0047] The target direction is the rotation direction of the impeller, and different misalignment directions correspond to different target directions. The impeller can be controlled to rotate in the target direction for 5 to 10 minutes under the influence of wind, until the misalignment distance between the bolt holes of the hub flange and the shaft is less than a preset error distance. The preset error distance is the range of misalignment distances between the bolt holes of the hub flange and the bolt holes of the shaft flange, and can be set according to the scenario, requirements, experience, etc., and is not limited here. In some examples, the target direction corresponding to the misalignment direction can be determined based on the misalignment direction; the wind direction information of the wind turbine can be obtained, and based on the wind direction information, the impeller can be unlocked and controlled to yaw to reach the target yaw position, so that the impeller rotates in the target direction under the influence of wind in the direction represented by the wind direction information. Wind direction information represents the direction of the wind, and the direction of the impeller's natural rotation under the force of the wind is related to the direction of the wind. The target yaw position is determined based on the wind direction information; the target yaw position is the yaw position where the direction of the impeller's natural rotation under the force of the wind is consistent with the target direction. At the target yaw position, the rotor naturally rotates in the same direction as the target under the force of the wind. In some cases, yaw may not be necessary, meaning the current yaw position of the wind turbine is the target yaw position, ensuring that the rotor naturally rotates in the same direction as the target under the force of the wind. In this case, yaw is not required; the rotor is unlocked, allowing it to rotate directly under the force of the wind. In this situation, the rotor's rotation direction is the target direction.

[0048] In some examples, when the misalignment direction is the first direction, the target direction is clockwise with the axis pointing from the shaft flange to the hub flange as the axis. When the misalignment direction is the second direction, the target direction is counterclockwise with the axis pointing from the shaft flange to the hub flange as the axis. The impeller rotates in the target direction under the force of the wind, causing relative slippage between the shaft flange and the hub flange, gradually correcting the misalignment between them, so that the bolt holes of the shaft flange and the hub flange are aligned. For example, Figure 8 This is a schematic diagram illustrating an example of correcting screw hole misalignment during impeller rotation, as provided in an embodiment of this application. Figure 8 As shown, as the impeller rotates in the target direction under the force of the wind, the hub flange 13 and the shaft flange 14 continuously slip relative to each other. Figure 8 As can be seen from left to right, the misalignment between the bolt hole 131 of the hub flange 13 and the bolt hole 141 of the shaft flange 14 is gradually improved until the bolt hole 131 of the hub flange 13 and the bolt hole 141 of the shaft flange 14 are aligned, thus completing the correction.

[0049] In this embodiment, when the wind turbine is stopped and the impeller is locked, individual bolts on the hub flange and shaft flange can be removed. Based on the bolt holes corresponding to the removed bolts, the misalignment direction of the hub flange and shaft flange can be determined. The remaining bolts are then loosened and tightened again to prevent gaps between the hub flange and shaft flange. The impeller is controlled to rotate naturally in the target direction corresponding to the misalignment direction under wind force, causing relative slippage between the hub flange and shaft flange during impeller rotation. This completes the misalignment correction, eliminates the misalignment of the bolt holes in the hub flange and shaft flange, reduces or even avoids bolt fatigue fracture and gaps between the impeller and shaft, and improves the safety of the wind turbine. Furthermore, the misaligned hole correction process does not require the use of a crane, which can significantly reduce the time spent on correction. For example, if a crane is used, it would take about 15 days to correct the misaligned hole and require about 10 operators. However, the misaligned hole correction method for the flange of the wind turbine unit adopted in this application embodiment can reduce the time spent on the misaligned hole correction process to 3 days and the number of operators required can also be reduced to about 3 people, thereby improving the correction efficiency and reducing the cost of correction.

[0050] In some embodiments, to avoid the risk of excessive slippage of the shaft flange and hub flange during the correction process, a guide bar can be used to correct misaligned holes. Figure 9 A flowchart of a method for correcting misaligned holes in a wind turbine flange provided in another embodiment of this application. Figure 9 and Figure 2 The difference is that, Figure 9 The method for correcting misaligned holes in the flange of the wind turbine shown may further include step S204. Figure 2 Step S203 can be further refined as follows: Figure 9 Steps S2031 to S2033 in the process.

[0051] In step S204, a guide bar is inserted into the screw hole corresponding to the bolt being removed, along the direction from the shaft flange to the hub flange.

[0052] Guide bars are used to assist in correcting misaligned holes in shaft flanges and hub flanges. Figure 10 This is a schematic diagram illustrating an example of inserting a guide rod into a screw hole according to an embodiment of this application, as shown below. Figure 10As shown, the guide rod 30 includes a straight structure 31 and an oblique structure 32 connected together. Along the length of the guide rod 30, the diameter of the oblique structure 32 gradually decreases. The guide rod 30 passes through the bolt hole of the rotating flange 14 and extends into the bolt hole of the hub flange 13. If the bolt hole of the rotating flange 14 and the bolt hole of the hub flange 13 are aligned and no correction is needed, the straight structure 31 of the guide rod 30 can be inserted into the bolt hole of the hub flange 13. If there is a misalignment between the bolt hole of the rotating flange 14 and the bolt hole of the hub flange 13 and correction is needed, the straight structure 31 of the guide rod 30 cannot yet extend into the bolt hole of the hub flange 13, but a portion of the oblique structure 32 will be inserted into the bolt hole of the hub flange 13. During the misalignment correction process, the guide bar 30 is inserted. A portion of the inclined structure 32 needs to be inserted into the threaded hole of the hub flange 13, ensuring that the minimum distance between the inclined structure 32 and the threaded hole wall of the hub flange 13 is less than or equal to a preset distance. In other words, the inclined structure 32 should be in close contact with the threaded hole wall of the hub flange 13. The preset distance is the distance used to determine whether the inclined structure of the guide bar is in close contact with the threaded hole of the hub flange. It can be set according to the scenario, requirements, experience, etc., and is not limited here.

[0053] In step S2031, the impeller is controlled to rotate in the target direction for a preset time under the action of wind, according to the direction of the misaligned hole.

[0054] The preset duration can be set according to the scenario, needs, experience, etc. For example, the preset duration can be set to 5 to 10 minutes.

[0055] In step S2032, if the minimum distance between the inclined structure and the wall of the bolt hole of the hub flange is greater than the preset distance, an impact force is applied to the guide bar along the direction from the rotating shaft flange to the hub flange, so that the minimum distance between the inclined structure and the wall of the bolt hole of the hub flange is less than or equal to the preset distance.

[0056] As the impeller rotates in the target direction under the force of the wind, the hub flange and the shaft flange will slip relative to each other. The minimum distance between the inclined structure and the bolt hole wall of the hub flange will gradually increase. That is, the inclined structure and the bolt hole of the hub flange will become loose. In order to continue the correction, the guide bar can be tapped so that the guide bar is close to the bolt hole wall of the hub flange again. That is, the minimum distance between the guide bar and the bolt hole wall of the hub flange is less than or equal to the preset distance again.

[0057] In step S2033, the impeller is controlled to rotate in the target direction for a preset time under the action of wind until the straight structure extends into the bolt hole of the hub flange.

[0058] If the minimum distance between the inclined structure and the wall of the bolt hole of the hub flange is less than or equal to the preset distance, control the impeller to rotate again, repeat step S2032 and the step of controlling the impeller to rotate, until the straight structure of the guide rod extends into the bolt hole of the hub flange after applying an impact force, indicating that the bolt hole of the hub flange is aligned with the bolt hole of the shaft flange, and the misalignment correction is completed.

[0059] For example, Figure 11 This is a schematic diagram illustrating an example of inserting a guide rod into a screw hole according to an embodiment of this application, as shown below. Figure 11 As shown on the left, in the initial state, the threaded holes of the rotating flange 14 and the hub flange 13 are misaligned and need to be corrected. The straight structure 31 of the guide rod 30 cannot yet extend into the threaded hole of the hub flange 13, but a part of the inclined structure 32 will insert into the threaded hole of the hub flange 13. After performing steps S2031 to S2033 once or multiple times, as Figure 11 As shown on the right, in the state after the calibration is completed, the screw hole of the rotating shaft flange 14 is aligned with the screw hole of the hub flange 13, and the straight body structure 31 extends into the screw hole of the hub flange 13.

[0060] To facilitate understanding, the following example illustrates the method for correcting misaligned holes in the flange of a wind turbine. Figure 12 A flowchart of the process for correcting misaligned holes in the flange of a wind turbine provided in this application embodiment is shown below. Figure 12 As shown, the process for correcting misaligned holes in the flange of the wind turbine may include steps a1 to a10.

[0061] In step a1, the wind turbine is stopped and the impeller is locked.

[0062] In step a2, individual bolts are removed and the other bolts are loosened.

[0063] In step a3, the impeller lock is released.

[0064] In step a4, observe the hub flange and axle flange. If obvious faults are found in the hub flange and axle flange, such as broken bolts, immediate maintenance is required. If no obvious faults are found in the hub flange and axle flange, proceed to step a5.

[0065] In step a5, the wind turbine is stopped, the impeller is locked, some bolts are removed, and the misalignment direction is determined.

[0066] In step a6, the guide rod is installed.

[0067] In step a7, the impeller is unlocked and controlled to rotate in the target direction corresponding to the misaligned hole direction under the action of the wind.

[0068] In step a8, the wind turbine is stopped, the impeller is locked, and the guide bar is struck.

[0069] In step a9, determine whether there is misalignment in the hub flange and the shaft flange. If misalignment exists, return to step a7; if no misalignment exists, proceed to step a10.

[0070] In step a10, the wind turbine is stopped, the impeller is locked, the bolts are tightened and installed, and the wind turbine is put back into operation.

[0071] The specific details of steps a1 to a10 above can be found in the relevant content of the above embodiments, and will not be repeated here.

[0072] The second aspect of this application provides a misalignment correction device for a flange of a wind turbine generator set, which is applied to the wind turbine generator set, which includes an impeller and a generator shaft, and the hub and the shaft are fixedly connected by a hub flange, a shaft flange and bolts. Figure 13 This is a schematic diagram of the structure of a misaligned hole correction device for a wind turbine flange provided in an embodiment of this application, as shown below. Figure 13 As shown, the misalignment correction device 400 for the flange of the wind turbine may include a misalignment direction determination module 401, a bolt processing module 402, and an impeller control module 403.

[0073] The misalignment direction determination module 401 can be used to remove individual bolts among multiple bolts connecting the hub flange and the shaft flange when the wind turbine is stopped and the impeller is locked, and determine the misalignment direction of the hub flange and the shaft flange based on the bolt holes corresponding to the removed bolts.

[0074] The bolt handling module 402 can be used to loosen the remaining bolts connecting the hub flange and the shaft flange, and then apply a preset tightening torque to tighten them.

[0075] The impeller control module 403 can be used to control the impeller to rotate in the target direction corresponding to the misalignment direction under the action of wind until the misalignment distance between the hub flange and the shaft flange and the bolt hole corresponding to the disassembled bolt is less than the preset error distance.

[0076] In some embodiments, the misalignment direction includes a first direction and a second direction; the first direction indicates that, in the direction of the wind turbine tower, the axis of the bolt hole of the pivot flange is higher than the axis of the bolt hole of the hub flange; the second direction indicates that, in the direction of the wind turbine tower, the axis of the bolt hole of the hub flange is higher than the axis of the bolt hole of the pivot flange.

[0077] In some embodiments, when the misalignment direction is a first direction, the target direction is a clockwise direction with the direction from the shaft flange to the hub flange as the axis; when the misalignment direction is a second direction, the target direction is a counterclockwise direction with the direction from the shaft flange to the hub flange as the axis.

[0078] In some embodiments, the impeller control module 403 may be specifically used to: determine the target direction corresponding to the misalignment direction according to the misalignment direction; acquire the wind direction information of the wind turbine; release the impeller lock according to the wind direction information; control the impeller to yaw to reach the target yaw position; and make the impeller rotate in the target direction under the action of the wind in the wind direction represented by the wind direction information.

[0079] In some embodiments, the impeller control module 403 can also be used to: insert a guide bar into the screw hole corresponding to the disassembled bolt along the direction from the shaft flange to the hub flange. The guide bar includes a straight structure and an inclined structure connected together. Along the length direction of the guide bar, the diameter of the cross section of the inclined structure gradually decreases. A part of the inclined structure is inserted into the screw hole of the hub flange, so that the minimum distance between the inclined structure and the hole wall of the screw hole of the hub flange is less than or equal to a preset distance.

[0080] In some embodiments, the impeller control module 403 may be specifically used to: control the impeller to rotate in the target direction for a preset time under the action of wind force according to the misalignment direction; if the minimum distance between the inclined structure and the hole wall of the bolt hole of the hub flange is greater than the preset distance, apply an impact force to the guide bar in the direction of the rotating shaft flange pointing to the hub flange, so that the minimum distance between the inclined structure and the hole wall of the bolt hole of the hub flange is less than or equal to the preset distance; control the impeller to rotate in the target direction for a preset time again under the action of wind force until the straight structure extends into the bolt hole of the hub flange.

[0081] In some embodiments, the remaining bolts connecting the hub flange and the shaft flange are divided into N bolt groups, each bolt group including at least one remaining bolt, and the bolts in each bolt group are spaced apart on the hub flange and the shaft flange, where N is an integer greater than 1. The bolt processing module 402 can be specifically used to: loosen the remaining bolts connecting the hub flange and the shaft flange in N steps, and then apply a preset tightening torque, loosening and tightening one bolt group at a time.

[0082] It should be noted that the misalignment correction device 400 for the flange of the wind turbine is a device corresponding to the misalignment correction method for the flange of the wind turbine described above. All implementation methods in the above method embodiments are applicable to the embodiments of this device and can achieve the same technical effect.

[0083] The third aspect of this application also provides a device for correcting misaligned holes in the flange of a wind turbine. Figure 14This is a schematic diagram of the structure of a misaligned hole correction device for a wind turbine flange provided in an embodiment of this application, as shown below. Figure 14 As shown, the misalignment correction device 500 for the flange of the wind turbine includes a memory 501, a processor 502, and a computer program stored in the memory 501 and capable of running on the processor 502.

[0084] In some examples, the processor 502 described above may include a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits that may be configured to implement the embodiments of this application.

[0085] Memory 501 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Therefore, typically, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the misalignment correction method for a wind turbine flange according to embodiments of this application.

[0086] The processor 502 runs a computer program corresponding to the executable program code by reading the executable program code stored in the memory 501, in order to implement the method for correcting misaligned holes in the flange of the wind turbine in the above embodiment.

[0087] In some examples, the misalignment correction device 500 for the flange of the wind turbine may also include a communication interface 503 and a bus 504. For example, Figure 14 As shown, the memory 501, processor 502, and communication interface 503 are connected through bus 504 and complete communication with each other.

[0088] The communication interface 503 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application. Input devices and / or output devices can also be connected through the communication interface 503.

[0089] Bus 504 includes hardware, software, or both, that couples the components of the flange misalignment correction device 500 of the wind turbine together. For example, and not limitingly, bus 504 may include an Accelerated GraphicsPort (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-E) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, bus 504 may include one or more buses. Although specific buses are described and illustrated in the embodiments of this application, this application considers any suitable bus or interconnection.

[0090] A fourth aspect of this application also provides a computer-readable storage medium storing computer program instructions. When executed by a processor, these computer program instructions can implement the misalignment correction method for the flange of the wind turbine generator described in the above embodiments, achieving the same technical effect. To avoid repetition, further details are omitted here. The aforementioned computer-readable storage medium may include non-transitory computer-readable storage media, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks, etc., and is not limited thereto.

[0091] This application provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the method for correcting misaligned holes in the flange of the wind turbine in the above embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0092] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. For the device embodiments, equipment embodiments, computer-readable storage medium embodiments, and computer program product embodiments, the relevant parts can be referred to the description section of the method embodiments. This application is not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0093] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0094] Those skilled in the art will understand that the above embodiments are exemplary and not restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specification, and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other means or steps; the quantifier "a" does not exclude a plurality; the terms "first" and "second" are used to identify names and not to indicate any particular order. No reference numerals in the claims should be construed as limiting the scope of protection. The functionality of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A method for correcting misaligned holes in a flange of a wind turbine generator set, characterized in that, Applied to wind turbine units, the wind turbine unit includes an impeller and a generator shaft, and the impeller hub and the shaft are fixedly connected by a hub flange, a shaft flange and bolts; The method includes: With the wind turbine unit shut down and the rotor locked, remove individual bolts from among the multiple bolts connecting the hub flange and the shaft flange, and determine the misalignment direction of the hub flange and the shaft flange based on the bolt holes corresponding to the removed bolts; Loosen the remaining bolts connecting the hub flange and the shaft flange, and then apply a preset tightening torque to tighten them; The impeller is controlled to rotate in the target direction corresponding to the misaligned hole direction under the action of wind until the misalignment distance between the hub flange and the shaft flange and the screw hole corresponding to the disassembled bolt is less than the preset error distance.

2. The method according to claim 1, characterized in that, The misalignment direction includes a first direction and a second direction; The first direction indicates that, in the direction of the wind turbine tower, the axis of the bolt hole of the shaft flange is higher than the axis of the bolt hole of the hub flange. The second direction indicates that, in the direction of the wind turbine tower, the axis of the bolt hole of the hub flange is higher than the axis of the bolt hole of the shaft flange.

3. The method according to claim 2, characterized in that, When the misalignment direction is the first direction, the target direction is a clockwise direction with the direction from the shaft flange to the hub flange as the axis; When the misalignment direction is the second direction, the target direction is a counterclockwise direction with the direction from the shaft flange to the hub flange as the axis.

4. The method according to claim 1, characterized in that, Controlling the impeller to rotate in a target direction corresponding to the misalignment direction under the force of wind includes: Based on the misaligned hole direction, determine the target direction corresponding to the misaligned hole direction; The wind direction information of the wind turbine is obtained, and the rotor is unlocked according to the wind direction information. The rotor is controlled to yaw and reach the target yaw position, so that the rotor rotates in the target direction under the action of the wind represented by the wind direction information.

5. The method according to claim 1, characterized in that, Before controlling the impeller to rotate in a target direction corresponding to the misalignment direction under the action of wind, the method further includes: A guide bar is inserted into the screw hole corresponding to the disassembled bolt along the direction from the rotating shaft flange to the hub flange. The guide bar includes a straight structure and an inclined structure connected together. Along the length of the guide bar, the diameter of the cross-section of the inclined structure gradually decreases. A part of the inclined structure is inserted into the screw hole of the hub flange, so that the minimum distance between the inclined structure and the hole wall of the screw hole of the hub flange is less than or equal to a preset distance.

6. The method according to claim 5, characterized in that, The control of the impeller to rotate in a target direction corresponding to the misalignment direction under the force of wind, until the misalignment distance between the hub flange and the shaft flange and the bolt holes corresponding to the disassembled bolts is less than a preset error distance, includes: Based on the misalignment direction, the impeller is controlled to rotate in the target direction for a preset time under the action of wind. If the minimum distance between the inclined structure and the wall of the bolt hole of the hub flange is greater than the preset distance, an impact force is applied to the guide bar along the direction from the rotating shaft flange to the hub flange, so that the minimum distance between the inclined structure and the wall of the bolt hole of the hub flange is less than or equal to the preset distance. The impeller is then controlled to rotate in the target direction for a preset time under the force of the wind until the straight structure extends into the bolt hole of the hub flange.

7. The method according to claim 1, characterized in that, The remaining bolts connecting the hub flange and the shaft flange are divided into N bolt groups, each bolt group includes at least one remaining bolt, and the bolts in each bolt group are distributed at intervals on the hub flange and the shaft flange, where N is an integer greater than 1; The step of loosening the remaining bolts connecting the hub flange and the shaft flange, and then applying a preset tightening torque for tightening, includes: The remaining bolts connecting the hub flange and the shaft flange are loosened in N steps, and then a preset tightening torque is applied. Each time, one bolt group is loosened and tightened.

8. A device for correcting misaligned holes in a flange of a wind turbine generator set, characterized in that, Applied to wind turbine units, the wind turbine unit includes an impeller and a generator shaft, and the impeller hub and the shaft are fixedly connected by a hub flange, a shaft flange and bolts; The device includes: The misalignment direction determination module is used to determine the misalignment direction of the hub flange and the shaft flange by disassembling individual bolts among a plurality of bolts connecting the hub flange and the shaft flange when the wind turbine is stopped and the rotor is locked; The bolt handling module is used to loosen the remaining bolts connecting the hub flange and the shaft flange, and then apply a preset tightening torque to tighten them. The impeller control module is used to control the impeller to rotate in a target direction corresponding to the misalignment direction under the action of wind, until the misalignment distance between the hub flange and the shaft flange and the screw hole corresponding to the disassembled bolt is less than the preset error distance.

9. A device for correcting misaligned holes in a wind turbine flange, characterized in that, include: Processor and memory storing computer program instructions; When the processor executes the computer program instructions, it implements the method for correcting misaligned holes in the flange of the wind turbine as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, implement the method for correcting misaligned holes in the flange of a wind turbine as described in any one of claims 1 to 7.

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