Machining method for output structure of yaw gearbox of wind driven generator

Abstract

The invention relates to the field of yaw gearboxes, in particular to a processing method for an output structure of a yaw gearbox of a wind driven generator, which comprises the following steps: forming at least two inner raceways on the peripheral wall of a planet carrier blank, forming mounting holes in each inner raceway along the radial direction, and carrying out heat treatment; preparing an annular body, processing a sampling raceway along the peripheral wall of the annular body, processing a blocking body for blocking the mounting hole along the radial direction of the sampling raceway, and carrying out heat treatment; blocking bodies are installed in all installation holes of a planet carrier blank, limiting holes are formed in the axial direction of a planet carrier, positioning pins are installed in the limiting holes to be fixed, then the planet carrier blank with the blocking bodies is machined according to the specified size, a finished planet carrier and the blocking bodies are obtained, the planet carrier and an output box body are assembled into a whole, and rolling balls are installed in a roller path. And plugging the mounting holes by the plugging body, inserting the positioning pins, and finally pressing the output shaft of the gearbox into the inner hole of the planet carrier. By implementing the scheme, the machining precision of the output structure of the yaw gearbox is improved.

Description

Technical Field

[0001] The invention relates to the field of yaw gear boxes, and in particular to a method for processing an output structure of a yaw gear box for a wind turbine. Background Art

[0002] The yaw gearbox is an important component of a wind turbine generator set. The yaw gearbox is installed vertically, and from top to bottom, it consists of an input component, a planetary component (usually four stages) and an output component. The total height of the last-stage planetary component and the output component of the existing yaw gearbox is relatively large, and the output positioning structure is not compact and heavy, which increases the rotational inertia of the yaw system, thereby increasing the energy consumption when the equipment starts and stops, affecting the overall efficiency of the wind power generation system. At the same time, under frequent yaw operations, higher energy consumption will directly affect the power generation cost and economic benefits of the wind turbine set.

[0003] In response to the above-mentioned defects, the applicant has developed and applied for a yaw gearbox with publication number CN217713572U. This technical solution has greatly improved the overall height and weight of the yaw gearbox. During the subsequent analysis and research, the applicant found that the above-mentioned structure still has room for improvement. Therefore, they have successively developed a lightened and small-volume yaw gearbox output shaft structure with application number 2024225454534, as well as a compact yaw gearbox output structure in this application, which makes the structure of the yaw gearbox simpler, more miniaturized and lighter.

[0004] Although the above two structures have great advantages in structure, they are difficult to process because they use a multi-raceway structure. Most of the existing technologies currently use a split assembly method to install the raceway. Although this method is easy to assemble, it will reduce the rigidity and stability of the structure. Publication No. CN 115614380 A discloses an integrated assembly method, that is, firstly, an axial hole, a filling hole and a limit hole are opened in the inner ring of the bearing, and then the pin is inserted into the filling hole to process the pin. After the pin is processed, the pin is taken out for ball filling. However, this method is not applicable to the present solution. Specifically, since the wall thickness of the planetary frame is relatively thin and there is no space to open an axial hole, even if an axial hole is opened, it will affect the bearing capacity of the planetary frame and the service life of the yaw gearbox. On the other hand, since the present solution is used in the field of wind power generation, it is necessary to ensure the precise assembly of the components, otherwise it will greatly affect the coordinated operation of the components, resulting in problems such as insensitive operation of the equipment or accelerated wear, and increased maintenance costs in the later stage. The above-mentioned document only discloses how to assemble the components. According to this assembly method, it is impossible to process a high-precision yaw gearbox output structure.

[0005] Therefore, it is necessary to design a high-precision machining method for the output structure of the yaw gearbox of a wind turbine. Summary of the invention

[0006] The present invention intends to provide a method for machining an output structure of a yaw gearbox of a wind turbine generator, so as to improve the machining accuracy of the output structure of the yaw gearbox.

[0007] To achieve the above object, the present invention adopts the following technical solution: a processing method for a yaw gearbox output structure of a wind turbine generator, comprising the following steps:

[0008] Processing of planet carrier blank: at least two inner raceways are formed on the outer peripheral wall of the planet carrier blank, mounting holes are formed radially on each inner raceway, the mounting holes are connected to the inner hole of the planet carrier, the mounting holes on adjacent inner raceways are staggered, and heat treatment is performed;

[0009] Processing of plugging body: prepare an annular body, process a sampling raceway along the outer peripheral wall of the annular body, the radius of the sampling raceway is not less than the radius of the inner raceway, and process a plugging body for plugging the mounting hole along the radial direction of the sampling raceway, and perform batch heat treatment on the plugging body;

[0010] Combined processing: install the plugging body into each installation hole of the planet carrier blank, make the sampling raceway of the plugging body and the inner raceway on the same pitch circle radius, open a limit hole along the axial direction of the planet carrier, the limit hole passes through the plugging body, install the positioning pin into the limit hole for fixing, and then process the planet carrier blank with the plugging body according to the specified size to obtain the finished planet carrier and the plugging body, and take out the finished plugging body;

[0011] Output box processing: an outer raceway matching the inner raceway of the planet carrier is opened on the inner circumferential wall of the output box blank, and heat treatment is performed, and then processed into a finished product;

[0012] Assembly: Assemble the planetary carrier and output housing into one body, so that the inner raceway and the outer raceway form a closed raceway, and install the balls into the raceways from each mounting hole respectively. After installation, seal each mounting hole with a plugging body, and insert the locating pin to fix the plugging body, and finally press the output shaft of the gear box into the inner hole of the planetary carrier.

[0013] Preferably, as an improvement, in the planet carrier blank processing step, the inner and outer radii, raceway radius and mounting holes of the planet carrier blank all have the same processing allowance q, wherein after the mounting holes are heat treated, the mounting holes are processed into standard mounting holes according to the specified inner diameter.

[0014] Preferably, as an improvement, in the plugging body processing step, when processing the plugging body from the annular body, a processing allowance q needs to be left in the circumferential direction of the plugging body, and after the heat treatment is completed, the plugging body is processed into a standard plugging body according to a specified diameter.

[0015] Preferably, as an improvement, in the plugging body processing step, the inner radius of the annular body is not less than the inner radius of the planet carrier blank, and the outer radius of the annular body is not greater than the outer radius of the planet carrier blank.

[0016] Preferably, as an improvement, in the plugging body processing step, the difference between the inner radius of the annular body and the inner radius of the planetary carrier blank, the difference between the outer radius of the annular body and the outer radius of the planetary carrier blank, and the difference between the sampling raceway radius and the raceway radius are all between 0-q / 5.

[0017] Preferably, as an improvement, before pressing the output shaft of the gearbox into the inner hole of the planet carrier, the sealing ring is first installed in the groove of the gasket, and then the planet carrier is inverted, and the gasket is placed in the inner hole of the planet carrier and fits with the spline end face.

[0018] Preferably, as an improvement, a sealing ring is installed on the shoulder of the output gear shaft, the output gear shaft is then pressed into the inverted planet carrier, and finally a nut is installed between the output gear shaft and the planet carrier for axial locking.

[0019] Preferably, as an improvement, there are two rolling tracks, and the balls on the lower rolling track are larger than the balls on the upper rolling track.

[0020] Preferably, as an improvement, the diameter ratio of the upper rolling ball to the lower rolling ball is 0.7-0.9.

[0021] The principles and advantages of this solution are:

[0022] 1. High assembly precision: When the applicant processed the yaw gearbox in the early stage, the blocking body and the locating pin were respectively installed in the planetary frame mounting hole and the limit hole for unified heat treatment. This method has high processing efficiency, but from time to time, some gearboxes will have low precision. After disassembling and analyzing the faulty gearbox, it was found that the problems mainly occurred in two places. First, there was a height difference between the raceway of the blocking body and the raceway of the planetary frame, which caused the ball to get stuck when running at this place; second, there were slight deformations of varying degrees at the locating pins and the limit holes (including the limit holes of the blocking body and the planetary frame), which caused the locating pins to fail to be positioned at the specified position of the limit hole, resulting in the loosening of the blocking body.

[0023] In order to solve the above problems, the planetary frame and the annular body in this scheme are both left with margins. First, the planetary frame is processed into an inner raceway and a mounting hole with a margin, and then heat treated. After heat treatment, the mounting hole with a margin is processed into a mounting hole of standard diameter, and then a ring body matching the inner and outer diameters of the lower end of the planetary frame is selected to process the sampling raceway and the plugging body with a margin is taken out along the sampling raceway, and the plugging body is batch heat treated and dimensioned. In this way, the surface of each component is heated evenly and the deformation is controllable during the heat treatment process. At the same time, the shape, size and size of the plugging body processed in one time match the height of the mounting hole, and no additional processing is required for the plugging body. Then, after assembling the two, start drilling the limit hole at the same time. In this way, when the plugging body and the planetary frame are in the best matching position, the limit hole drilled at the same time can ensure the overlap accuracy of the limit holes of the two, and is conducive to rapid and accurate positioning during subsequent actual assembly. Install the positioning pin to fix the plugging body in the mounting hole, and then grind off the margin synchronously during fine processing of the matched planetary frame and plugging body. In this way, the accuracy of each combined component is ensured, and then the high-precision components are assembled, so that the overall assembly accuracy of the yaw gearbox is high.

[0024] 2. Stable processing. Since the distance between two adjacent raceways is close, only 3-6mm, if radial holes are made at the same vertical position, the arm between the two will be easily damaged during processing, thus causing the entire planetary carrier to be scrapped. Therefore, this solution avoids mutual interference when opening the installation holes and avoids the generation of scrapped products by staggering the two adjacent installation holes. At the same time, staggering the two installation holes is conducive to uniform force on the planetary carrier and the entire gearbox during actual operation.

[0025] 3. In the processing of the plugging body, an annular body with an inner radius ≥ the inner radius of the planetary carrier blank and an outer radius ≤ the outer radius of the planetary carrier blank is selected, and a sampling raceway is first processed on the outer peripheral wall of the annular body, and finally multiple plugging bodies are processed radially along the sampling raceway, and then the plugging bodies are batch heat treated. The plugging bodies processed in this way, on the one hand, have their two end faces processed at one time and are highly matched with the raceway curved surface and the inner hole curved surface of the planetary carrier respectively, which is conducive to the subsequent combined drilling processing, so that the plugging body can be accurately and quickly installed in the mounting hole, and at the same time, it can be quickly observed or judged by naked eyes and hands whether the two end faces of the plugging body are inside the mounting hole, so as to quickly judge whether the plugging body is accurately installed and make timely adjustments, thereby effectively ensuring the high precision of each component after the combined drilling; on the other hand, this method can be used for batch processing and production of plugging bodies, effectively improving production efficiency.

[0026] 4. In this scheme, the processing steps of the limit holes are placed after the blocking piece, the inner raceway and the mounting hole are processed. That is, the limiting holes are processed after the blocking piece is transitionally fitted in the mounting hole. The effect of this design is that when the blocking piece is precisely fitted in the mounting hole, the planetary carrier and the blocking piece are drilled synchronously. In this way, in the subsequent actual assembly, it is only necessary to insert the blocking piece with the limiting holes into the mounting hole, and it is only necessary to roughly correspond the limiting holes of the blocking body and the limiting holes of the planetary carrier. Then, when the locating pin is inserted, the installation position of the blocking body can be automatically and quickly adjusted so that the two end faces of the blocking body are highly matched with the inner hole wall and the raceway curved surface of the planetary carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a compact yaw gearbox output structure of the present invention.

[0028] Figure 2 This is a partial schematic diagram of the planetary carrier blank processing.

[0029] Figure 3 Schematic diagram of the upper plugging body processing.

[0030] Figure 4 Schematic diagram of the processing of the lower plugging body.

[0031] Figure 5 This is a schematic diagram of the assembly process.

[0032] Figure 6 This is a partial enlarged view of the inner raceway of the planetary carrier and the sampling raceway of the upper plugging body.

[0033] Figure 7 This is a partial enlarged view of the inner raceway of the planetary carrier and the sampling raceway of the lower plugging body. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The figure marks in the drawings of the specification include: planetary carrier 1, output gear shaft 2, output housing 3, inner hole 4, axial limit groove 5, fixing unit 6, limit nut 7, upper ball 8, lower ball 9, upper oil seal 10, lower oil seal 11, gasket 12, O-ring 13, upper plugging body 14, lower plugging body 15, limit hole 16, positioning pin 17, mounting hole 18, sampling raceway 19.

[0036] A compact yaw gearbox output structure, as shown in the attached Figure 1As shown: it includes a planet carrier 1, an output housing 3 and an output gear shaft 2. The planet carrier 1 and the output housing 3 are respectively integrated with inner and outer raceways. Two raceways are formed between the inner and outer raceways, and the ball size of the lower raceway is larger than the ball size of the upper raceway. The diameter ratio of the upper ball size to the lower ball size is 0.7-0.9. Within this diameter ratio range, the upper ball 8 and the lower ball 9 are evenly stressed and have better load-bearing capacity. The output gear shaft 2 is sleeved inside the planet carrier 1, and a limiting unit and a fixing unit 6 are provided between the two from top to bottom to fix the output gear shaft 2 axially and radially respectively. The fixing unit 6 is a spline structure, including a spline provided on the planet carrier 1. The limiting unit includes an axial limiting groove 5 opened on the top of the planet carrier and the output gear shaft 2, and a limiting nut 7 is provided in the axial limiting groove 5. The limiting nut 7 is threadedly connected with the output gear shaft 2.

[0037] A preparation method for a processing method of a yaw gearbox output structure of a wind turbine is as follows: This embodiment takes the processing of two raceways, and the radius of the lower raceway is greater than the radius of the upper raceway as an example, and includes the following steps:

[0038] Planet carrier 1 blank processing: Figure 2 As shown, an annular planetary carrier 1 blank is prepared, the inner radius of the planetary carrier 1 blank at the lower end is d, the outer radius is D, two inner raceways are opened on the outer peripheral wall of the planetary carrier 1 blank, the upper inner raceway radius is r, and the lower inner raceway radius is R, and a mounting hole 18 is opened radially on each inner raceway, each mounting hole 18 is connected to the inner hole 4 of the planetary carrier 1, and the upper and lower mounting holes 18 are staggered. As a preferred embodiment, in this embodiment, the two mounting holes 18 are symmetrically arranged along the axis of the planetary carrier 1, and the inner and outer radii of the planetary carrier 1 and the radii of the two inner raceways and the mounting holes all have the same margin q, q is 0.3mm-0.7mm, and specifically 0.5mm can be taken in this embodiment. By setting the margin, when the planetary carrier 1 is heat treated and accurately matched with the plugging body after the heat treatment, the two combined are synchronously fine-machined again to machine out the margin, thereby ensuring that the plugging body and the planetary carrier 1 are accurately integrated and the outer contour is maintained on the same curved surface. Then the planet carrier 1 blank with the inner raceway and the mounting hole 18 is heat treated. After the heat treatment is completed, the mounting hole is processed into a standard mounting hole according to a specified inner diameter.

[0039] Plug body processing:

[0040] 1. Processing of upper plugging body 14: Figure 3As shown, a ring body is prepared, and the difference between the inner and outer radius of the ring body and the inner and outer radius of the planet carrier 1 is ±q / 5, specifically, the difference is ±0.1mm, so that the wall thickness of the ring body is basically consistent with the planet carrier 1, and the plugging body taken out is basically consistent with the mounting hole 18, which is convenient for subsequent processing. In order to achieve better results in this embodiment, the inner radius of the ring body is selected as d1, and the outer radius is D1. The inner radius d1 of the ring body is ≥ the inner radius d of the planet carrier 1 blank, and the greater amount is not more than 0.1mm, and the outer radius D1 of the ring body is ≤ the outer radius D of the planet carrier 1 blank, and the less amount is not more than 0.1mm. In this way, during the subsequent combined fine processing, on the one hand, it can be quickly and intuitively judged whether the two ends of the plugging body protrude from the two end faces of the planet carrier 1 by naked eye observation and hand touch, and at the same time, the error amount is controlled at q / 5, that is, 0.1mm. In this way, as long as the two end faces of the plugging body do not protrude from the two end faces of the planet carrier 1, the high-precision matching after the combined processing of the two can be ensured; on the other hand, the tool is smoother during processing and is not prone to tool vibration, so that the surface processing accuracy is higher. A sampling raceway 19 is processed along the circumferential wall of the annular body, and the radius of the sampling raceway 19 is r1, r1≥the radius r of the upper inner raceway, and the greater amount is no more than 0.1mm to avoid the tool chattering phenomenon when the tool processes this part; a plurality of upper plugging bodies 14 for transitionally fitting in the upper inner raceway mounting hole 18 are processed radially along the sampling raceway 19, and the upper plugging bodies 14 have a radial margin q, q is 0.3mm-0.7mm, and specifically 0.5mm in this embodiment, and then a plurality of upper plugging bodies 14 are batch-heat-treated. After the heat treatment is completed, they are processed into standard plugging bodies according to the specified diameter of the upper plugging bodies.

[0041] 2. Processing of the lower plugging body 15: Figure 4 As shown, an annular body is prepared, and the difference between the inner and outer radius of the annular body and the inner and outer radius of the planetary carrier 1 is ±q / 5, specifically, the difference is ±0.1mm. In this embodiment, the inner radius of the annular body is d2, the outer radius is D2, and the inner radius d2 of the annular body is ≥ the inner radius d of the planetary carrier 1 blank, and the greater amount is not more than 0.1mm, and the outer radius D2 of the annular body is ≤ the outer radius D of the planetary carrier 1 blank, and the less amount is not more than 0.1mm; a sampling raceway 19 is machined along the circumferential wall of the annular body, and the radius of the sampling raceway 19 is r2, r2 is ≥ the radius R of the lower inner raceway, and the greater amount is not more than 0.1mm; a plurality of lower plugging bodies 15 for transitional fit in the lower inner raceway mounting hole 18 are radially machined along the sampling raceway 19, and the lower plugging body 15 has a radial margin q, q is 0.3mm-0.7mm, specifically 0.5mm, and then a plurality of lower plugging bodies 15 are batch-heat-treated. After the heat treatment is completed, they are processed into standard plugging bodies according to the specified diameter of the lower plugging bodies.

[0042] Combined processing: Figure 5As shown, the upper and lower plugging bodies 15 after heat treatment are respectively installed in the mounting holes 18 of the upper inner raceway and the lower inner raceway. After the installation is completed, first determine whether the sampling raceway of the plugging body and the inner raceway are on the same pitch circle radius, that is, whether the two end faces of the plugging body are flush with the inner and outer surfaces of the planetary carrier blank. Since the two end faces of the plugging body are initially formed in the previous step, the accuracy of the installation angle of the plugging body in this step is particularly important. If the plugging body is rotated 10° compared to the normal angle during installation, it will cause the sampling raceway and the inner raceway on the planetary carrier to be misaligned. At the same time, the inner hole wall of the plugging body and the planetary carrier will also be uneven. When assembling the output gear shaft, the plugging body will be squeezed to move along the outer raceway, thereby causing the sampling raceway to protrude from the inner raceway, causing the ball located at or moved to that place to get stuck or rotate unsmoothly. Therefore, this solution needs to determine the installation angle of the plugging body before drilling the limiting hole. The judgment method is: use your hand to slide along the end face of the plugging body for a circle to feel whether the cross section of the plugging body protrudes from the end face of the planetary carrier. If the protrusion is large, the installation angle of the plugging body needs to be adjusted. If it is small, no additional processing is required, and it can be solved directly in the following fine processing (removing the allowance) step. According to current practice, the installation angle deviation of the plugging body is not large, and it can basically be solved through the fine processing step. This is also another important purpose of setting the allowance for each component of this solution during processing. Then a limiting hole 16 is opened along the axial direction of the planetary carrier 1. The limiting hole 16 is a tapered hole. The limiting hole 16 passes through the plugging body. The positioning pin 17 is inserted into the limiting hole 16 to fix the plugging body. The positioning pin 17 is a tapered pin. Then the contour of the planetary carrier 1 blank with the plugging body is finely processed into a finished product according to the specified size, such as Figure 5-Figure 7 As shown, processing is performed along the dotted outline of the planet carrier 1 blank. After the processing is completed, the finished planet carrier 1 and the finished plugging body are obtained, and the plugging body is taken out.

[0043] Processing of output box body 3: Two outer raceways matching with the inner raceway of planet carrier 1 are opened on the inner circumferential wall of output box body 3 blank, and a processing allowance q is left for the outer raceways. After heat treatment of output box body 3 blank, the outer raceways are finely processed to the specified size to obtain the finished output box body 3.

[0044] Assembly: First install the upper oil seal 10 on the output housing, then invert the output housing 3 and install the lower oil seal 11 on the output housing 3. Lift the planet carrier and insert it into the output housing 3, so that the inner raceway and the outer raceway correspond to each other to form the upper raceway and the lower raceway, keep the planet carrier in place, and install the upper ball 8 and the lower ball 9 from the mounting holes 18 of the upper raceway and the lower raceway respectively. After the installation is completed, the plugging body is transitionally matched in each mounting hole 18, and the plugging body and the limiting hole 16 on the planet carrier 1 are roughly corresponding. At this time, release the lifting device (it can also be released after the upper ball or the lower ball is installed), and then drive the positioning pin into the limiting hole to fix the plugging body. Install the O-type sealing ring 13 into the groove of the gasket 12, and then put the gasket 12 equipped with the O-type sealing ring 13 into the inner hole 4 of the planet carrier 1 and fit it with the spline end face.

[0045] Install another O-ring 13 onto the shoulder of the output gear shaft 2, then press the output gear shaft 2 into the inverted planet carrier 1 along the splines of the planet carrier, and finally install the limit nut 7 into the axial limit groove 5 between the output gear shaft 2 and the planet carrier 1, and tighten the limit nut 7 onto the output gear shaft 2 for axial locking.

[0046] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for processing the output structure of a yaw gearbox of a wind turbine, characterized in that: The following steps are involved: Processing of planet carrier blank: at least two inner raceways are formed on the outer peripheral wall of the planet carrier blank, mounting holes are formed radially on each inner raceway, the mounting holes are connected to the inner hole of the planet carrier, the mounting holes on adjacent inner raceways are staggered, and heat treatment is performed; Processing of plugging body: prepare an annular body, process a sampling raceway along the outer peripheral wall of the annular body, the radius of the sampling raceway is not less than the radius of the inner raceway, and process a plugging body for plugging the mounting hole along the radial direction of the sampling raceway, and perform batch heat treatment on the plugging body; Combined processing: install the plugging body into each installation hole of the planet carrier blank, make the sampling raceway of the plugging body and the inner raceway on the same pitch circle radius, open a limit hole along the axial direction of the planet carrier, the limit hole passes through the plugging body, install the positioning pin into the limit hole for fixing, and then process the planet carrier blank with the plugging body according to the specified size to obtain the finished planet carrier and the plugging body, and take out the finished plugging body; Output box processing: an outer raceway matching the inner raceway of the planet carrier is opened on the inner circumferential wall of the output box blank, and heat treatment is performed, and then processed into a finished product; Assembly: Assemble the planetary carrier and output housing into one body, so that the inner raceway and the outer raceway form a closed raceway, and install the balls into the raceways from each mounting hole respectively. After installation, seal each mounting hole with a plugging body, and insert the locating pin to fix the plugging body, and finally press the output shaft of the gear box into the inner hole of the planetary carrier.

2. A method for processing the output structure of a yaw gearbox of a wind turbine according to claim 1, characterized in that: In the planet carrier blank processing step, the inner and outer radii, raceway radius and mounting holes of the planet carrier blank are all left with the same processing allowance q. After the mounting holes are heat treated, the mounting holes are processed into standard mounting holes according to the specified inner diameter.

3. A method for processing the output structure of a yaw gearbox of a wind turbine according to claim 2, characterized in that: In the plugging body processing step, when the plugging body is processed from the annular body, a processing allowance q needs to be left in the circumferential direction of the plugging body. After the heat treatment is completed, the plugging body is processed into a standard plugging body according to the specified diameter of the plugging body.

4. According to a processing method for a yaw gearbox output structure of a wind turbine as described in claim 3, in the plugging body processing step, the inner radius of the annular body is not less than the inner radius of the planetary carrier blank, and the outer radius of the annular body is not greater than the outer radius of the planetary carrier blank.

5. A method for processing the output structure of a yaw gearbox of a wind turbine according to claim 4, characterized in that: In the plugging body processing step, the difference between the inner radius of the annular body and the inner radius of the planet carrier blank, the difference between the outer radius of the annular body and the outer radius of the planet carrier blank, and the difference between the sampling raceway radius and the raceway radius are all between 0-q / 5.

6. A method for processing the output structure of a yaw gearbox of a wind turbine according to claim 5, characterized in that: Before pressing the output shaft of the gearbox into the inner hole of the planet carrier, first install the sealing ring into the groove of the gasket, then turn the planet carrier upside down, put the gasket into the inner hole of the planet carrier and fit it with the spline end face.

7. A method for processing the output structure of a yaw gearbox of a wind turbine according to claim 6, characterized in that: Install the sealing ring onto the shoulder of the output gear shaft, press the output gear shaft into the inverted planet carrier, and finally install the limit nut between the output gear shaft and the planet carrier for axial locking.

8. A method for processing the output structure of a yaw gearbox of a wind turbine according to claim 7, characterized in that: There are two rolling tracks, and the balls on the lower rolling track are larger than the balls on the upper rolling track.

9. A method for processing the output structure of a yaw gearbox of a wind turbine according to claim 8, characterized in that: The ratio of the size of the upper rolling ball to the diameter of the lower rolling ball is 0.7-0.9.

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