A method and tooling for repairing the yaw drive flange of a wind turbine generator main frame

Abstract

This application discloses a method and tooling for repairing the yaw drive flange of a wind turbine main frame, including: removing components around the deformed hole and pre-treating the surface; installing a positioning reference tooling based on the assembly surface of the yaw bearing and determining the reference surface; determining the mounting surface of the milling device based on the reference surface and adjusting it; rough milling the flange surface to a predetermined depth; measuring whether the distance from the rough-milled flange surface to the reference surface meets the requirements; rough milling to the predetermined depth, and then fine milling to the standard depth; removing the milling device, installing a boring positioning tooling based on the fine-milled flange surface as the positioning surface, and adjusting it; fine boring the flange hole to a predetermined size; enlarging and tapping the original bolt holes on the yaw drive flange; and installing the yaw drive and other components on the main frame. This application ensures the accuracy of the yaw drive installation position, solves the problem of nacelle removal caused by the difficulty in repairing the main frame, and eliminates the high maintenance costs caused by nacelle removal.

Description

Technical Field

[0001] This application relates to the field of wind turbine generator technology, and in particular to a method for repairing the yaw drive flange of a wind turbine generator main frame. Additionally, this application provides a tooling for implementing the above method. Background Technology

[0002] The main frame of a wind turbine serves as the load-bearing structure, providing support for the transmission system and bearing and transmitting loads from the rotor. The yaw system connects the main frame and the tower, transferring the load from the main frame to the tower and simultaneously rotating the entire nacelle to ensure the rotor faces the wind, maximizing the swept area and increasing power generation.

[0003] The driving force for the nacelle's rotation comes from the yaw drive, which is mounted on the flange surface extending from the main frame and meshes with the outer ring of the yaw bearing mounted on the tower, while the inner ring of the yaw bearing is fixed to the main frame. To ensure good meshing between the yaw drive teeth and the yaw bearing teeth, the yaw drive flange surface and the yaw bearing flange surface on the main frame must maintain a certain degree of parallelism.

[0004] When the drive flange surface deforms beyond the parallelism requirement during wind turbine operation due to various reasons, the drive teeth and bearing teeth will mis-mesh, easily leading to tooth breakage. If the deformation of the main frame drive flange surface is not severe, the power output is generally reduced to decrease the yaw load by sacrificing power generation; if the deformation is severe, the main frame cannot be used.

[0005] The most common solution currently is to replace the main frame by removing the wind turbine and nacelle from the tower. The cost of removing the nacelle from the tower is not only the main frame itself, but also includes labor, nacelle transportation, road construction, cranes, power generation loss, etc., which increases the overall cost.

[0006] Therefore, how to reduce maintenance costs is a technical problem that technicians need to solve in response to the deformation of the yaw drive flange surface of the main frame of currently in service wind turbines that causes the nacelle to fall off the tower. Summary of the Invention

[0007] The purpose of this application is to provide a method for repairing the yaw drive flange of a wind turbine main frame. This method ensures the accuracy of the yaw drive installation position as much as possible, solves the problem of nacelle removal from the tower caused by the difficulty in repairing the main frame, and eliminates the high maintenance costs caused by nacelle removal from the tower.

[0008] Another objective of this application is to provide a tooling for implementing the above-described method.

[0009] To achieve the above objectives, this application provides a method for repairing the yaw drive flange of a wind turbine generator main frame, the method comprising:

[0010] Step S1: Remove all components around the deformation holes on the main frame and perform surface pretreatment on the parts to be processed;

[0011] Step S2: Install the positioning reference fixture based on the yaw bearing, and the reference surface of the positioning reference fixture is parallel to the assembly surface of the yaw bearing;

[0012] Step S3: Determine the mounting surface of the milling device based on the reference surface, and adjust it until the mounting surface is parallel to the reference surface;

[0013] Step S4: Rough mill the flange face of the yaw drive flange to a predetermined depth h1;

[0014] Step S5: Use a depth gauge to measure the distance from the rough-milled flange surface to the reference surface and check if it meets the requirements. If it does, proceed to step S6; otherwise, return to step S3.

[0015] Step S6: Rough milling to the predetermined depth, and then finish milling to the standard depth h2;

[0016] Step S7: Remove the milling device, and install the boring positioning fixture based on the precision-milled flange surface as the positioning surface, and make adjustments.

[0017] Step S8: The flange hole of the yaw drive flange is precision bored to a predetermined size;

[0018] Step S9: Expand and tap the original bolt holes on the yaw drive flange, and install wire thread inserts;

[0019] Step S10: Install the yaw drive and the remaining components on the main frame.

[0020] Preferably, the positioning reference fixture includes a center distance indicating fixture and a circle center indicating fixture. When installing the positioning reference fixture in step S2,

[0021] First, the center distance indicating fixture is installed on the yaw bearing to determine the center distance between the yaw drive flange and the yaw bearing, and to determine the reference surface;

[0022] The center indicator fixture is then installed on the yaw drive flange to assist the center distance indicator fixture in determining the center position of the yaw drive flange.

[0023] Preferably, the center distance indicating fixture includes:

[0024] The central positioning part has an arc that abuts against the outer wall of the inner ring of the yaw bearing, and the central positioning part is able to rotate about the center of the arc, the center of the arc coinciding with the center of the yaw bearing.

[0025] The positioning plate is integrally formed with the central positioning part and fixed to the upper surface of the outer ring of the yaw bearing, and has the reference surface parallel to the assembly surface;

[0026] A central axis indicator cylinder is set perpendicular to the positioning plate, and the distance between the axis of the central axis indicator cylinder and the axis of the yaw bearing is the center distance between the yaw drive flange and the yaw bearing.

[0027] In step S2, when determining the reference surface and the center distance, the outer wall of the inner ring of the yaw bearing is used as the reference to determine the yaw rotation center and the yaw drive center position distribution circle. The distance between the yaw rotation center and the center of the yaw drive circle is the center distance. The upper surface of the outer ring of the yaw bearing is used as the reference to determine the reference surface parallel to the assembly surface.

[0028] Preferably, the center indicator fixture includes:

[0029] ontology;

[0030] A positioning hole is provided on the body, corresponding to the bolt hole on the yaw drive flange, and is fixed to the body by a fixing bolt;

[0031] A central hole is formed on the body, and its center coincides with the axis of the yaw drive flange. The central hole is an unclosed partial arc hole.

[0032] When determining the center position of the yaw drive flange, the multiple bolt holes on the side of the yaw drive flange closest to the yaw bearing and which have not been deformed are used as a reference, and the center indicator fixture is fixed on the yaw drive flange by multiple fixing bolts.

[0033] Preferably, the calibration in step S3 includes:

[0034] Step S31: Pass the boring bar through the central axis indicator cylinder;

[0035] Step S32: Slowly rotate the center distance indicating fixture along the center of the yaw bearing, and drive the boring bar to rotate slowly together;

[0036] Step S33, until the distance between the boring bar axis and the center axis of the spindle hole is minimized or coincides, at which point the center axis of the center axis indicator cylinder is the final center axis position of the yaw drive flange;

[0037] Step S34: Install multiple support feet of the milling device in the flange hole of the yaw drive flange;

[0038] Step S35: Using a depth gauge, measure and adjust the distances of the multiple support feet from the positioning plate to be the same, and achieve the predetermined rough milling dimensions.

[0039] Preferably, the boring positioning fixture includes the center distance indicating fixture and the boring positioning fixture body. In step S7, when the boring positioning fixture is installed, the boring positioning fixture body uses the precision-milled flange surface as the positioning surface to determine the perpendicularity of the hole to be boring.

[0040] Preferably, the boring positioning fixture body includes:

[0041] The lower plate is installed on the yaw drive flange and fits against the positioning surface. The lower plate has mounting holes corresponding to the bolt holes of the yaw drive flange.

[0042] The upper plate is located above the lower plate and is fixedly connected to the lower plate via a support portion;

[0043] Both the upper plate and the lower plate have through holes at their centers, and the two through holes are coaxial.

[0044] When installing the boring positioning fixture body, first align the lower plate with the yaw drive flange positioning surface, and then fix the lower plate to the yaw drive flange with bolts.

[0045] Preferably, a hollow ring is provided at the through hole. After the boring positioning fixture body is installed, the boring bar passes through the two hollow rings. Multiple fastening bolts are provided on the hollow rings, and the two bearings on the boring bar are fixed to the two hollow rings by the fastening bolts.

[0046] Preferably, the calibration in step S7 includes the following steps:

[0047] Step S71: Pass the boring bar through the through hole and the hollow ring, and through the central axis indicator cylinder;

[0048] Step S72: Rotate the center distance indicating fixture, and at the same time drive the boring bar to rotate;

[0049] Step S73, until the boring bar approaches or coincides with the axis of the through hole, finally tighten the fastening bolt to fix the boring bar.

[0050] This application also provides a tooling for implementing any of the methods described above, comprising:

[0051] A center distance indicating fixture, installed on a yaw bearing, is used to determine the center distance between the yaw drive flange and the yaw bearing, and to determine a reference surface. It includes a center positioning part that conforms to the outer wall of the inner ring of the yaw bearing, a positioning plate integrally formed with the center positioning part, and a center axis indicating cylinder perpendicular to the positioning plate. The center of the center positioning part coincides with the center of the yaw bearing. The positioning plate is fixed to the upper surface of the outer ring of the yaw bearing and has the reference surface parallel to the mounting surface of the yaw bearing. The distance between the axis of the center axis indicating cylinder and the axis of the yaw bearing is the center distance between the yaw drive flange and the yaw bearing.

[0052] A center-indicating fixture is used to determine the center position of the yaw drive flange. It includes a body, a positioning hole and a central hole on the body. The positioning hole corresponds to the bolt hole on the yaw drive flange and is fixed to the body by fixing bolts. The center of the central hole coincides with the axis of the yaw drive flange. The central hole is an unclosed partial arc hole.

[0053] A milling device is mounted on the yaw drive flange with the reference surface as the mounting surface, and mills the flange face of the yaw drive flange.

[0054] The boring and positioning fixture body is mounted on the yaw drive flange with the milled flange surface as the positioning surface. It includes a lower plate that fits against the positioning surface and an upper plate located above the lower plate and fixedly connected to it via a support. The lower plate has mounting holes corresponding to the bolt holes of the yaw drive flange. Both the upper and lower plates have through holes at their centers, and these two through holes are coaxial. Hollow rings are provided at the through holes, and a boring bar passes through both hollow rings. Multiple fastening bolts are provided on the hollow rings, and two bearings on the boring bar are fixed to the two hollow rings by these fastening bolts. The boring bar also cooperates with the central axis indicator cylinder to determine the center position of the yaw drive flange.

[0055] The boring device is used to drive the boring bar to move and complete the machining of the flange hole of the yaw drive flange.

[0056] Compared to the aforementioned background technology, this application uses the assembly surface of the yaw bearing as a reference surface. This reference surface is unaffected by the deformation of the yaw drive flange. Based on this reference surface, a milling device is installed with this reference surface as a reference. Through adjustment, the mounting surface of the milling device is made parallel to the reference surface, thereby milling the upper flange surface of the yaw drive flange to ensure the parallelism between the upper flange surface of the yaw drive flange and the yaw bearing. After precision milling, the upper flange surface is now in a standard state, and the milling device can be disassembled. A boring positioning fixture is installed based on the precision-milled flange surface as a positioning surface and adjusted to meet the machining accuracy of the boring, ensuring that the machined flange hole meets the center distance requirement with the yaw bearing. At the same time, the flange hole is precision-bored to the predetermined size. Finally, the original bolt holes on the yaw drive flange are enlarged and tapped, wire thread inserts are installed, and the installation requirements are met. The yaw drive and other components on the main frame are then installed. Therefore, by adopting the above method, it is feasible to repair the yaw drive flange on the main frame, meet the technical requirements of yaw gear meshing, and avoid the high maintenance costs caused by replacing the main frame.

[0057] Furthermore, this application also includes tooling for implementing the above method. This tooling includes a center distance indicating tooling, a center point indicating tooling, a milling device, a boring positioning tooling body, and a boring device. The center distance indicating tooling is mounted on the yaw bearing and can determine the center distance between the yaw drive flange and the yaw bearing, as well as the reference surface. The center point indicating tooling is mounted on the yaw drive flange and used to determine the center position of the yaw drive flange. The milling device is mounted on the yaw drive flange with the reference surface as the mounting surface and mills the flange face of the yaw drive flange. The boring positioning tooling body is mounted on the yaw drive flange with the milled flange face as the positioning surface. Of course, the center point indicating tooling needs to be removed during the installation of the boring positioning tooling body; the two do not affect each other. After the boring positioning tooling body is installed, the boring bar cooperates with the center shaft indicating cylinder to determine the center position of the yaw drive flange; then the boring device drives the boring bar to complete the machining of the flange hole of the yaw drive flange. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0059] Figure 1 This is a flowchart of a method for repairing the yaw drive flange of a wind turbine generator main frame, provided in an embodiment of this application.

[0060] Figure 2This is a schematic diagram of the mounting structure of the reference positioning tooling provided in the embodiments of this application;

[0061] Figure 3 This is a schematic diagram of the center distance indicating tooling structure provided in the embodiments of this application;

[0062] Figure 4 This is a schematic diagram of the center indicator tooling structure provided in the embodiments of this application;

[0063] Figure 5 This is a schematic diagram of the boring positioning fixture installation structure provided in the embodiments of this application;

[0064] Figure 6 This is a schematic diagram of the main structure of the boring positioning fixture provided in the embodiments of this application.

[0065] In the figure: 1. Center distance indicator fixture 2. Center indicator fixture 3. Yaw drive flange 4. Inner ring 5. Outer ring 6. Main body of boring positioning fixture 7. Boring device 11. Center positioning part 12. Positioning plate 13. Center shaft indicator cylinder 21. Body 22. Positioning hole 23. Shaft hole 61. Lower plate 62. Upper plate 63. Support part 64. Hollow ring 65. Fastening bolt 66. Mounting hole 71. Boring rod. Detailed Implementation

[0066] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0067] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0068] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0069] like Figure 1 As shown in this embodiment, a method for repairing the yaw drive flange of a wind turbine generator main frame is provided. The method specifically includes the following steps:

[0070] Step S1: Remove all components around the deformation holes on the main frame and perform surface pretreatment on the areas to be processed. There are various methods for pretreatment, such as mechanical, physical, or chemical methods, to remove surface oil, oxides, burrs, rough edges, etc., which will not be described in detail here.

[0071] Step S2: Install the positioning reference fixture based on the yaw bearing, and the reference surface of the positioning reference fixture is parallel to the assembly surface of the yaw bearing; the assembly surface here refers to the plane when it is assembled with the main frame, and the positioning installation reference fixture is based on this plane to ensure that the reference surface of the positioning reference fixture is set parallel to the assembly surface.

[0072] In addition, the installation reference fixture includes center distance indicator fixture 1 and center point indicator fixture 2, such as Figure 2 As shown, the center distance indicating fixture 1 is used to determine the center distance between the yaw drive flange 3 and the yaw bearing, and to determine the reference surface. The center point indicating fixture 2 is used to determine the center position of the yaw drive flange 3, which refers to the center position of the yaw drive flange 3 before deformation.

[0073] Specifically, please refer to Figure 3 The center distance indicating fixture 1 includes a center positioning part 11, a positioning plate 12, and a center shaft indicating cylinder 13. The center point indicating fixture 2 includes a body 21, a positioning hole, and a shaft hole. The center distance indicating fixture 1 uses the outer wall of the inner ring 4 of the yaw bearing as a reference to determine the yaw rotation center, i.e., the center of the yaw drive flange 3; and uses the upper surface of the outer ring 5 of the yaw bearing as a reference to determine the reference surface of the drive flange.

[0074] The center positioning part 11 fits against the outer wall of the inner ring 4 of the yaw bearing. Due to the fitting arrangement, the arc of the center positioning part 11 should be consistent with the arc of the outer wall of the inner ring 4 of the bearing. Therefore, the center of the arc of the center positioning part 11 coincides with the center of the yaw bearing. When determining the reference plane and center distance, the arc of the center positioning part 11 abuts against the outer wall of the inner ring 4 of the yaw bearing, and both are rotated. Then the center of the arc coincides with the center of the yaw bearing, thereby determining the center of the yaw rotation center. The center of the center shaft indicator cylinder 13 is located on the yaw drive center position distribution circle. By rotating the center distance indicator fixture 1, the center position distribution circles of multiple yaw drives can be determined in sequence. The center position distribution circle here refers to the circle formed by the centers of multiple yaw drives before the yaw drive flange 3 is deformed.

[0075] The positioning plate 12 and the central positioning part 11 are integrally formed and fixed to the upper surface of the outer ring 5 of the yaw bearing. They have a reference surface parallel to the assembly surface. Various fixing methods are possible, such as strong magnetic adsorption. The positioning plate 12 extends outward from the outer ring 5. A central axis indicator cylinder 13 is provided on the positioning plate 12, perpendicular to the positioning plate 12. The distance between the axis of the central axis indicator cylinder 13 and the axis of the yaw bearing is the center distance between the yaw drive flange 3 and the yaw bearing. It should be noted that the center distance here refers to the center distance between the two gears that need to mesh before the yaw drive flange 3 deforms.

[0076] Please refer to Figure 4 The positioning hole 22 is opened on the body 21, corresponding to the bolt hole on the yaw drive flange 3, and is fixed on the body 21 by the fixing bolt; the shaft hole 23 is opened on the body 21, and the center of the hole coincides with the shaft center of the yaw drive flange 3. The shaft hole 23 is an unclosed part of the arc hole.

[0077] When determining the center position of the yaw drive flange 3, the undeformed bolt holes on the side of the yaw drive flange 3 closest to the yaw bearing are used as a reference. The center indicator fixture 2 is fixed on the yaw drive flange by multiple fixing bolts. At this time, the shaft hole 23 coincides with the shaft center of the yaw drive flange 3 before deformation.

[0078] Step S3: Determine the mounting surface of the milling device based on the reference plane and adjust it until the mounting surface is parallel to the reference plane. The milling device here can be a device in the prior art, such as the portable flange end face processing machine with patent number CN107282943A and related products, which will not be detailed here. In this context, the mounting surface of the milling device refers to the mounting surface of its support legs when the milling device is installed.

[0079] In step S3, the calibration includes the following steps:

[0080] Step S31: Pass the boring bar through the central axis indicator cylinder 13;

[0081] Step S32: Slowly rotate the center distance indicator fixture 1 along the center of the yaw bearing, and drive the boring bar to rotate slowly together;

[0082] Step S33, until the distance between the boring bar axis and the center axis of the spindle hole 23 is the minimum or coincides, at which point the center axis of the center axis indicator cylinder 13 is the final center axis position of the yaw drive flange 3;

[0083] Step S34: Install multiple support feet of the milling device in the flange hole of the yaw drive flange 3;

[0084] Step S35: Using a depth gauge, measure and adjust the distance between the multiple support feet and the positioning plate 12 to be the same, and achieve the predetermined rough milling dimensions. At this time, the mounting surface is in a parallel state with the reference surface.

[0085] Step S4: Roughly mill the flange face of the yaw drive flange 3 to a predetermined depth.

[0086] Step S5: Use a depth gauge to measure the distance from the rough-milled flange surface to the reference surface and check if it meets the requirements. If it does, proceed to step S6; otherwise, re-enter step S3.

[0087] Step S6: Rough milling to the predetermined depth, followed by finish milling to the standard depth. It should be noted that both rough milling and finish milling in this application are performed on the upper surface of the flange face, i.e., the surface that directly abuts against the yaw drive. This completes the milling of the flange face, achieving the goal of making the plane of the yaw drive parallel to the mounting surface of the eccentric bearing during installation. However, when the yaw drive flange 3 deforms, not only does its surface tilt, but the flange hole also tilts to a certain extent. Therefore, this application further repairs the flange hole, as detailed in the following steps:

[0088] Step S7: Remove the milling device and install the boring positioning fixture based on the precision-milled flange surface as the positioning surface, and perform adjustments. Please refer to... Figure 5 The boring positioning fixture includes a center distance indicator fixture 1 and a boring positioning fixture body 6. The boring positioning fixture body 6 uses the precision-milled flange surface as the positioning surface to determine the perpendicularity of the hole to be boring; that is, after steps S1 to S6, the positioning surface is in a standard state and there is no tilting, so the boring positioning fixture body 6 is set with this surface as the reference.

[0089] Please refer to Figure 6 The boring positioning fixture body 6 includes a lower plate 61 and an upper plate 62. The lower plate 61 is mounted on the yaw drive flange 3 and fits against the positioning surface. The lower plate 61 has mounting holes 66 corresponding to the bolt holes of the yaw drive flange 3, and is fixedly connected to the flange by bolts. The upper plate 62 is located above the lower plate 61 and is fixedly connected to the lower plate 61 by a support part 63, which can be multiple support rods. Both the upper plate 62 and the lower plate 61 have through holes at their centers, and the two through holes are coaxial. It should be noted that when setting the through holes, it is important to ensure that when rotating the center distance indicator fixture 1, there is a position where the center axis indicator cylinder 13 is coaxial with the through hole.

[0090] A hollow ring 64 is provided at the through hole. The boring bar 71 passes through two hollow rings 64 and two through holes. Multiple fastening bolts 65 are provided on the hollow rings 64. Two bearings on the boring bar 71 are fixed to the two hollow rings 64 by the fastening bolts 65.

[0091] The calibration in step S7 includes the following steps:

[0092] In step S71, the boring bar 71 is passed through the through hole and the hollow ring 64, and then through the central axis indicator cylinder 13; there is a certain gap between the boring bar 71 and the through hole and the hollow ring 64, so as to retain a certain amount of movement space;

[0093] Step S72: Rotate the center distance indicator fixture 1, which in turn drives the boring bar 71 to rotate.

[0094] Step S73, until the boring bar 71 approaches or coincides with the axis of the through hole, finally tighten the fastening bolt 65 to fix the boring bar.

[0095] In step S8, the boring device 7 drives the boring bar 71 to move, thereby precision boring the flange hole of the yaw drive flange 3 to the predetermined size.

[0096] Step S9: Expand and tap the original bolt holes on the yaw drive flange 3, and install wire thread inserts.

[0097] Step S10: Install the yaw drive and the remaining components on the main frame.

[0098] In summary, this application uses the assembly surface of the yaw bearing as a reference surface. This reference surface is unaffected by the deformation of the yaw drive flange 3. Based on this reference surface, a milling device is installed with this reference surface as a reference. Through adjustment, the mounting surface of the milling device is made parallel to the reference surface, thereby milling the upper flange surface of the yaw drive flange 3 to ensure the parallelism between the upper flange surface of the yaw drive flange 3 and the yaw bearing. After precision milling, the upper flange surface is in a standard state, and the milling device can be disassembled. A boring positioning fixture is installed based on the precision-milled flange surface as a positioning surface and adjusted to meet the boring machining accuracy, ensuring that the machined flange hole meets the center distance requirement with the yaw bearing. At the same time, the flange hole is precision-bored to the predetermined size. Finally, the original bolt holes on the yaw drive flange 3 are enlarged and tapped, wire thread inserts are installed, and the installation requirements are met. The yaw drive and other components on the main frame are then installed. Therefore, by adopting the above method, it is feasible to repair the yaw drive flange on the three sides of the main frame, meet the technical requirements of yaw gear meshing, and avoid the high maintenance costs caused by replacing the main frame.

[0099] In addition, this application also includes tooling for implementing the above method. The tooling includes a center distance indicating tooling 1, a circle center indicating tooling 2, a milling device, a boring positioning tooling body 6, and a boring device 7, which are consistent with the structure set in the method. The tooling can also ensure the accuracy of the yaw drive installation position, solve the problem of nacelle turret removal caused by the difficulty in repairing the main frame, and eliminate the high maintenance cost caused by nacelle turret removal.

[0100] It should be noted that the boring bar 71 and the central axis indicator cylinder 13 have a high degree of coaxiality, and there is no wobble gap between them, thus ensuring the accuracy of the boring bar 71 during adjustment. Furthermore, since the inner ring 4 and outer ring 5 in existing yaw bearings generally have different heights, with the inner ring 4 typically higher than the outer ring 5, the center positioning part 11 can be placed against the outer wall of the inner ring 4, which is higher than the outer ring 5. Additionally, the center positioning part 11 and the positioning plate 12 can be configured with different thicknesses to meet the stability requirements of the center distance indicating fixture 1.

[0101] The main frame yaw drive flange 3 repair method and tooling of the present invention fully consider the selection of reference surfaces and the control of machining errors during the machining process, and meet the gear meshing requirements of the yaw system. In this machining scheme, the milling device and boring device 7 are both commercially available products, which are easy to obtain and can be used in the small space inside the engine room, greatly reducing the maintenance cost of the engine room.

[0102] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0103] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A wind turbine mainframe yaw drive flange repair method, characterized in that, The method comprises: Step S1, dismounting each component around the deformed hole on the main frame and pre-treating the surface of the part to be processed; Step S2, installing a positioning reference tooling based on the yaw bearing, and the reference surface of the positioning reference tooling is parallel to the assembly surface of the yaw bearing; Step S3, determining the installation surface of the milling device based on the reference surface, and adjusting until the installation surface is parallel to the reference surface; Step S4, rough milling the flange surface of the yaw drive flange to a predetermined depth h1; Step S5, measuring the distance from the rough-milled flange surface to the reference surface using a depth gauge, checking whether it meets the requirements, if yes, entering step S6, if not, re-entering step S3; Step S6, rough milling to a predetermined depth h2, and then fine milling to a standard depth; Step S7, dismounting the milling device, and installing a boring positioning tooling based on the fine-milled flange surface as a positioning surface, and adjusting; Step S8, fine boring the flange hole of the yaw drive flange to a predetermined size; Step S9, reaming and tapping the original bolt hole on the yaw drive flange, and installing a steel wire sleeve; Step S10, installing the yaw drive and the remaining components on the main frame; The positioning reference tooling comprises a center distance indicating tooling and a circle center indicating tooling, when installing the positioning reference tooling in step S2, firstly, the center distance indicating tooling is installed on the yaw bearing, which is used to determine the center distance between the yaw drive flange and the yaw bearing, and to determine the reference surface; then, the circle center indicating tooling is installed on the yaw drive flange, which is used to assist the center distance indicating tooling to determine the circle center position of the yaw drive flange; The center distance indicating tooling comprises, a center positioning part having a circular arc abutting against the outer wall of the inner ring of the yaw bearing, and the center positioning part can rotate around the circle center of the circular arc, and the circle center of the circular arc coincides with the center of the yaw bearing; a positioning plate integrally formed with the center positioning part, fixed on the upper surface of the outer ring of the yaw bearing, and having the reference surface parallel to the assembly surface; a center shaft indicating cylinder arranged perpendicularly to the positioning plate, and the distance between the axis of the center shaft indicating cylinder and the axis of the yaw bearing is the center distance between the yaw drive flange and the yaw bearing; When determining the reference surface and the center distance in step S2, the yaw rotation center and the yaw drive center position distribution circle are determined by taking the abutment on the outer wall of the inner ring of the yaw bearing as the reference, and the distance between the yaw rotation center and the yaw drive center is the center distance; and the reference surface parallel to the assembly surface is determined by taking the upper surface of the outer ring of the yaw bearing as the reference.

2. The wind turbine mainframe yaw drive flange repair method of claim 1, wherein, The circle center indicating tooling comprises: a body; a positioning hole opened on the body, corresponding to the bolt hole on the yaw drive flange, and fixed on the body by a fixing bolt; an axis hole opened on the body, and the circle center coincides with the axis of the yaw drive flange, and the axis hole is a part of a non-closed circular arc hole. In the determination of the center position of the yaw drive flange, the multiple bolt holes on the side of the yaw drive flange close to the yaw bearing and not deformed are taken as the reference, and the center indication tool is fixed on the yaw drive flange through the multiple fixing bolts.

3. The wind turbine mainframe yaw drive flange repair method of claim 2, wherein, The adjustment in the step S3 includes: Step S31, the boring bar passes through the center shaft indication cylinder; Step S32, the center distance indication tool is slowly rotated along the center of the yaw bearing, and the boring bar is slowly rotated; Step S33, until the distance between the axis of the boring bar and the center axis of the shaft hole is minimum or coincides, at this time, the center axis of the center shaft indication cylinder is the final center axis position of the yaw drive flange; Step S34, the multiple support feet of the milling device are installed in the flange hole of the yaw drive flange; Step S35, the distance between the multiple support feet and the positioning plate is measured and adjusted to be the same, and the predetermined rough milling size is reached.

4. The wind turbine mainframe yaw drive flange repair method of claim 3, wherein, The boring positioning tool includes the center distance indication tool and a boring positioning tool main body, in the step S7, when the boring positioning tool is installed, the boring positioning tool main body takes the finished rough milling surface as the positioning surface to determine the perpendicularity of the boring hole.

5. The wind turbine mainframe yaw drive flange repair method of claim 4, wherein, The boring positioning tool main body includes: The lower plate is installed on the yaw drive flange and is attached to the positioning surface, and the lower plate is provided with the installation hole corresponding to the bolt hole of the yaw drive flange; The upper plate is located above the lower plate and is fixedly connected with the lower plate through the support part; The through hole is provided at the center of the upper plate and the lower plate, and the two through holes are coaxial. When the boring positioning tool main body is installed, the lower plate is first attached to the positioning surface of the yaw drive flange, and then the lower plate is fixed on the yaw drive flange through the bolt.

6. The wind turbine mainframe yaw drive flange repair method of claim 5, wherein, The hollow ring is provided at the through hole, after the boring positioning tool main body is installed, the boring bar passes through the two hollow rings, the hollow ring is provided with the multiple fastening bolts, and the two bearings on the boring bar are fixed at the two hollow rings through the fastening bolts.

7. The wind turbine mainframe yaw drive flange repair method of claim 6, wherein, The adjustment in the step S7 includes the following steps: Step S71, the boring bar passes through the through hole, the hollow ring and the center shaft indication cylinder; Step S72, the center distance indication tool is rotated, and the boring bar is rotated; Step S73, until the boring bar approaches or coincides with the center axis of the through hole, and finally the fastening bolts are tightened to fix the boring bar.

8. A tool for implementing the method of any one of claims 1 to 7, characterized in that It includes: The center distance indicating tool is installed on the yaw bearing and used for determining the center distance between the yaw driving flange and the yaw bearing and determining a reference surface, comprising a center positioning part abutting the outer wall of the inner ring of the yaw bearing, a positioning plate integrally formed with the center positioning part, and a center shaft indicating cylinder arranged perpendicularly to the positioning plate; the center of the center positioning part coincides with the center of the yaw bearing; the positioning plate is fixed on the upper surface of the outer ring of the yaw bearing and has the reference surface parallel to the assembly surface of the yaw bearing; the distance between the axis of the center shaft indicating cylinder and the axis of the yaw bearing is the center distance between the yaw driving flange and the yaw bearing; The center indicating tool is used for determining the center position of the yaw driving flange and comprises a body, a positioning hole and an axis hole arranged on the body; the positioning hole corresponds to the bolt hole on the yaw driving flange and is fixed on the body through a fixing bolt; the axis hole coincides with the axis of the yaw driving flange, and the axis hole is a part of arc hole which is not closed; The milling device is installed on the yaw driving flange with the reference surface as the installation surface and mills the flange surface of the yaw driving flange; The boring positioning tool body is installed on the yaw driving flange with the milled flange surface as the positioning surface and comprises a lower plate abutting the positioning surface and an upper plate located above the lower plate and fixedly connected with the lower plate through a support part; the lower plate is provided with an installation hole corresponding to the bolt hole of the yaw driving flange; the center of the upper plate and the center of the lower plate are provided with through holes coaxially, the through holes are provided with hollow rings, a boring bar passes through the two hollow rings, the hollow rings are provided with a plurality of fastening bolts, two bearings on the boring bar are fixed at the two hollow rings through the fastening bolts; the boring bar cooperates with the center shaft indicating cylinder to determine the center position of the yaw driving flange; The boring device is used for driving the boring bar to move and processing the flange hole of the yaw driving flange.

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