Wind turbine conical main shaft system, wind turbine and main shaft system installation gap adjusting method

Abstract

The application relates to the technical field of wind power generation, in particular to a wind driven generator conical main shaft system, a wind driven generator and a main shaft system installation gap adjustment method. The wind driven generator conical main shaft system comprises a moving shaft, a fixed shaft and at least one bearing unit; each bearing unit comprises a bearing inner ring, a bearing outer ring and a plurality of bearing rollers; the bearing outer ring is sleeved on the bearing inner ring, and the plurality of bearing rollers are arranged in an annular array around the axis of the bearing inner ring between the bearing inner ring and the bearing outer ring; wherein the bearing inner ring is in clearance fit with the moving shaft or the fixed shaft and is detachably connected with the moving shaft or the fixed shaft; the bearing outer ring is in clearance fit with the fixed shaft or the moving shaft and is detachably connected with the fixed shaft or the moving shaft. The wind driven generator conical main shaft system avoids the cracking risk of the inner and outer rings of the bearing caused by the interference fit of the bearing; reduces the error of the assembly gap, avoids the risk of the installation of the wind turbine main machine factory; moreover, the reliability is better, the weight is lighter, the structure is simpler, and the cost is lower.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and more specifically, to a conical main shaft system for a wind turbine, a wind turbine, and a method for adjusting the clearance of the main shaft system. Background Technology

[0002] Currently, the wind turbine main shaft system structure using single-row tapered roller bearings with double supports is gradually becoming the trend. In existing tapered roller bearing connection structures, the inner and outer rings of the front and rear bearings are connected to the main shaft and bearing housings using interference fits. However, this interference fit connection structure requires heating the inner rings of the front and rear bearings and the bearing housings during the entire main shaft system installation process to generate a significant expansion, thus achieving the fitting of the bearing inner and outer rings with the main shaft and bearing housings. This installation method has the following disadvantages: Excessive interference fit can generate significant circumferential stress, posing a risk of cracking to the bearing inner and outer rings; while insufficient interference fit can lead to creep in the bearing inner and outer rings; furthermore, the main shaft unit has a flared opening, making stress concentration prone to occur at the bends. Summary of the Invention

[0003] The objectives of this invention include, for example, providing a method for adjusting the clearance of a conical main shaft system for a wind turbine, a wind turbine, and the main shaft system. This method replaces the interference fit with a detachable connection and clearance fit, avoiding the risk of cracking of the inner and outer rings of the bearing due to the interference fit. Furthermore, the conical main shaft system of this wind turbine can be pre-assembled into bearing units, allowing for installation and clearance adjustment at a professional bearing factory, reducing assembly errors in clearance and mitigating installation risks at the wind turbine manufacturer. In addition, the shaft unit is changed from the original flared structure to a near-straight shaft structure, avoiding stress concentration at the bending point, resulting in better reliability, lighter weight, simpler structure, and lower cost.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] In a first aspect, the present invention provides a conical main shaft system for a wind turbine generator, the conical main shaft system for a wind turbine generator including a moving shaft, a fixed shaft and at least one bearing unit;

[0006] Each bearing unit includes an inner bearing ring, an outer bearing ring, and multiple bearing rollers; the outer bearing ring is fitted onto the inner bearing ring, and the multiple bearing rollers are arranged in a ring array around the axis of the inner bearing ring between the inner and outer bearing rings.

[0007] The bearing inner ring is clearance-fitted with the moving shaft or the fixed shaft and is detachably connected to the moving shaft or the fixed shaft; the bearing outer ring is clearance-fitted with the fixed shaft or the moving shaft and is detachably connected to the fixed shaft or the moving shaft.

[0008] In an optional embodiment, the bearing unit further includes a plurality of first connecting bolts and a plurality of second connecting bolts; the plurality of first connecting bolts are all connected to the inner ring of the bearing, and the plurality of second connecting bolts are all connected to the outer ring of the bearing.

[0009] The inner ring of the bearing is connected to the moving shaft or the fixed shaft by multiple first connecting bolts, and the outer ring of the bearing is connected to the fixed shaft or the moving shaft by multiple second connecting bolts.

[0010] In an optional embodiment, a plurality of first connecting bolts are arranged in a ring array around the axis of the inner ring of the bearing, and a plurality of second connecting bolts are arranged in a ring array around the axis of the outer ring of the bearing.

[0011] In an optional embodiment, the inner ring of the bearing is connected to the moving shaft by a plurality of first connecting bolts, and the outer ring of the bearing is connected to the fixed shaft by a plurality of second connecting bolts. The inner ring of the bearing is clearance-fitted with the moving shaft, and the outer ring of the bearing is clearance-fitted with the fixed shaft.

[0012] In an optional embodiment, the conical main shaft system of the wind turbine also includes a hub, a first connecting flange and a plurality of third connecting bolts, wherein the hub is connected to the drive shaft through the first connecting flange and the plurality of third connecting bolts.

[0013] In an optional embodiment, the inner ring of the bearing is connected to the fixed shaft by a plurality of first connecting bolts, and the outer ring of the bearing is connected to the moving shaft by a plurality of second connecting bolts. The inner ring of the bearing is clearance-fitted with the fixed shaft, and the outer ring of the bearing is clearance-fitted with the moving shaft.

[0014] In an optional embodiment, the wind turbine conical main shaft system also includes a hub, a generator, a second connecting flange, a nacelle, a plurality of fourth connecting bolts, and a plurality of fifth connecting bolts;

[0015] The wheel hub is connected to the drive shaft via multiple fourth connecting bolts;

[0016] The nacelle is connected to the fixed shaft via a second connecting flange and multiple fifth connecting bolts; the generator is connected to the drive shaft and the second connecting flange.

[0017] In an optional embodiment, the conical main shaft system of the wind turbine includes multiple bearing units; the multiple bearing units are spaced apart along the axis of the moving shaft or the fixed shaft.

[0018] In a second aspect, the present invention provides a wind turbine generator, comprising:

[0019] The wind turbine includes the aforementioned conical main shaft system of the wind turbine.

[0020] Thirdly, the present invention provides a method for adjusting the clearance of a main shaft system, which is implemented using the aforementioned conical main shaft system of a wind turbine generator, comprising:

[0021] Place the bearing unit on the measuring platform and measure the height difference between the large end of the inner ring and the small end of the outer ring of both the front and rear bearings. Record this difference as S. t and S t ’ ;

[0022] Install the inner ring of the front bearing onto the fixed shaft using the first connecting bolt, then hoist it to the installation platform. Install the outer rings of the front and rear bearings onto the moving shaft using the second connecting bolt, and then hoist the moving shaft and assemble it with the fixed shaft.

[0023] Before grinding, the inner ring of the rear bearing is installed onto the fixed shaft using the first connecting bolt. The moving shaft and fixed shaft are then aligned. At this point, the rear bearing has positive clearance. Then, the bearing is rotated to ensure uniform contact of the front bearing. The height difference between the large end of the inner ring and the small end of the outer ring of the front bearing is measured and recorded as H. The preload of the front bearing due to the weight of the moving shaft is S. t -H;

[0024] The height difference between the large end of the inner ring and the small end of the outer ring of the rear bearing is measured and denoted as F. The preset clearance of the entire shaft system is X, that is, the wear allowance of the inner ring width of the rear bearing is L = (FS). t ’ )+X-(S t -H);

[0025] Based on the calculated grinding dimensions, after machining the small end face of the inner ring of the rear bearing, the inner ring of the rear bearing is installed onto the fixed shaft again using the first connecting bolt, thus completing the clearance adjustment process.

[0026] The beneficial effects of the embodiments of the present invention include:

[0027] The conical main shaft system of the wind turbine includes a moving shaft, a fixed shaft, and at least one bearing unit; each bearing unit includes an inner bearing ring, an outer bearing ring, and multiple bearing rollers; the outer bearing ring is fitted onto the inner bearing ring, and the multiple bearing rollers are arranged in a ring array around the axis of the inner bearing ring between the inner bearing ring and the outer bearing ring; wherein, the inner bearing ring is clearance-fitted with the moving shaft or the fixed shaft and is detachably connected to the moving shaft or the fixed shaft; the outer bearing ring is clearance-fitted with the fixed shaft or the moving shaft and is detachably connected to the fixed shaft or the moving shaft.

[0028] This wind turbine conical main shaft system uses a clearance fit between the bearing unit and the moving and fixed shafts, and is detachably connected. Compared to the interference fit method in existing technologies, this avoids the risk of cracking of the inner and outer rings of the bearings caused by the interference fit. Moreover, the bearing unit of this wind turbine conical main shaft system can be pre-assembled, allowing for installation and clearance adjustment at a professional bearing factory, reducing assembly errors in clearance and mitigating installation risks at the wind turbine manufacturer. In addition, compared to the existing structure that suffers from shaft bending due to interference fit, the moving or fixed shaft of the shaft unit can be changed from the original flared structure to a near-straight shaft structure, thus avoiding shaft bending. This prevents stress concentration at the bending point, resulting in better reliability, lighter weight, simpler structure, and lower cost. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the conical main shaft system of the wind turbine generator in an embodiment of the present invention when it is the inner ring main shaft system;

[0031] Figure 2 This is a schematic diagram illustrating the application of the conical main shaft system of the wind turbine generator as an inner-circle main shaft system in an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the structure of the wind turbine's conical main shaft system when it is the outer ring main shaft system in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram illustrating the application of the conical main shaft system of the wind turbine generator as the outer ring main shaft system in an embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of the structure of the bearing unit placed on the measuring platform in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the inner ring of the front bearing installed on the fixed shaft and hoisted to the installation platform in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of the rear bearing inner ring mounted on the fixed shaft in an embodiment of the present invention.

[0037] Icons: 100 - Wind turbine conical main shaft system; 101 - Moving shaft; 102 - Fixed shaft; 103 - Bearing unit; 104 - Front bearing; 105 - Rear bearing; 111 - Bearing inner ring; 112 - Bearing outer ring; 113 - Bearing roller; 114 - First connecting bolt; 115 - Second connecting bolt; 121 - Hub; 122 - First connecting flange; 123 - Third connecting bolt; 124 - Generator; 125 - Second connecting flange; 126 - Nacelle; 127 - Fourth connecting bolt; 128 - Fifth connecting bolt; 131 - Measurement platform; 132 - Installation platform. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do 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, and therefore should not be construed as a limitation of this invention.

[0042] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0043] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0044] Please refer to Figures 1-4This embodiment provides a conical main shaft system 100 for a wind turbine generator, which includes a moving shaft 101, a fixed shaft 102, and at least one bearing unit 103.

[0045] Each bearing unit 103 includes an inner bearing ring 111, an outer bearing ring 112, and a plurality of bearing rollers 113; the outer bearing ring 112 is fitted onto the inner bearing ring 111, and the plurality of bearing rollers 113 are arranged in a ring array around the axis of the inner bearing ring 111 between the inner bearing ring 111 and the outer bearing ring 112.

[0046] The bearing inner ring 111 is clearance-fitted with the moving shaft 101 or the fixed shaft 102 and is detachably connected to the moving shaft 101 or the fixed shaft 102; the bearing outer ring 112 is clearance-fitted with the fixed shaft 102 or the moving shaft 101 and is detachably connected to the fixed shaft 102 or the moving shaft 101.

[0047] Please refer to Figures 1-4 The working principle of the conical main shaft system 100 of the wind turbine is as follows:

[0048] The conical main shaft system 100 of the wind turbine includes a moving shaft 101, a fixed shaft 102, and at least one bearing unit 103. Each bearing unit 103 includes an inner bearing ring 111, an outer bearing ring 112, and a plurality of bearing rollers 113. The outer bearing ring 112 is sleeved on the inner bearing ring 111, and the plurality of bearing rollers 113 are arranged in a ring array around the axis of the inner bearing ring 111 between the inner bearing ring 111 and the outer bearing ring 112. The inner bearing ring 111 is clearance-fitted with the moving shaft 101 or the fixed shaft 102 and is detachably connected to the moving shaft 101 or the fixed shaft 102. The outer bearing ring 112 is clearance-fitted with the fixed shaft 102 or the moving shaft 101 and is detachably connected to the fixed shaft 102 or the moving shaft 101.

[0049] As can be seen from the foregoing, in this embodiment, when setting the conical main shaft system 100 of the wind turbine generator, the bearing unit 103 is installed with the moving shaft 101 and the fixed shaft 102. During the installation of the moving shaft 101 and the fixed shaft 102, the bearing inner ring 111 is clearance-fitted with the moving shaft 101 or the fixed shaft 102 and is detachably connected to the moving shaft 101 or the fixed shaft 102; the bearing outer ring 112 is clearance-fitted with the fixed shaft 102 or the moving shaft 101 and is detachably connected to the fixed shaft 102 or the moving shaft 101. Therefore, the bearing unit 103 is detachably connected to the moving shaft 101 and the fixed shaft 102 with a clearance fit, which is different from the interference fit connection method in the prior art.

[0050] Therefore, the conical main shaft system 100 of the wind turbine adopts a clearance fit between the bearing unit 103 and the moving shaft 101 and the fixed shaft 102, and is detachably connected. Compared with the interference fit method in the prior art, this can avoid the risk of cracking of the inner and outer rings of the bearing due to the interference fit. Moreover, the bearing unit 103 of the conical main shaft system 100 of the wind turbine can be pre-assembled, and can then be installed and the clearance adjusted in a professional bearing factory, reducing the error of the clearance during assembly and avoiding the installation risk of the wind turbine main unit manufacturer. In addition, compared with the structure of the prior art that has a bent shaft due to the interference fit, the moving shaft 101 or the fixed shaft 102 of the shaft unit can be changed from the original flared structure to a near straight shaft structure, thereby avoiding the bending of the shaft, thus avoiding stress concentration at the bending point, resulting in better reliability, lighter weight, simpler structure, and lower cost.

[0051] Further, please refer to Figures 1-4 As can be seen from the above, when installing the bearing unit 103, the bearing inner ring 111 is detachably connected to the moving shaft 101 or the fixed shaft 102, and the bearing outer ring 112 is detachably connected to the fixed shaft 102 or the moving shaft 101. Based on this, this embodiment adopts a bolted detachable connection. In other embodiments of the present invention, other forms of detachable connection can also be adopted.

[0052] Specifically, in this embodiment, when the bearing unit 103 is connected to the moving shaft 101 and the fixed shaft 102 by means of bolt connection, the bearing unit 103 also includes a plurality of first connecting bolts 114 and a plurality of second connecting bolts 115. Moreover, the plurality of first connecting bolts 114 are all connected to the inner ring 111 of the bearing, and the plurality of second connecting bolts 115 are all connected to the outer ring 112 of the bearing. In this embodiment, the inner ring 111 of the bearing is connected to the moving shaft 101 or the fixed shaft 102 through the plurality of first connecting bolts 114, and the outer ring 112 of the bearing is connected to the fixed shaft 102 or the moving shaft 101 through the plurality of second connecting bolts 115.

[0053] In addition, multiple first connecting bolts 114 are arranged in a ring array around the axis of the inner ring 111 of the bearing, and multiple second connecting bolts 115 are arranged in a ring array around the axis of the outer ring 112 of the bearing.

[0054] Based on the above structural settings, please refer to Figures 1-4 When connecting the inner ring 111 of the bearing to the moving shaft 101 or the fixed shaft 102, and the outer ring 112 of the bearing to the fixed shaft 102 or the moving shaft 101, the connection between the inner ring 111 of the bearing and the moving shaft 101 or the fixed shaft 102, and the connection between the outer ring 112 of the bearing and the fixed shaft 102 or the moving shaft 101 can be achieved by installing multiple first connecting bolts 114 and multiple second connecting bolts 115.

[0055] Furthermore, based on the above structural arrangement, in this embodiment, according to the installation positions of the moving shaft 101 and the fixed shaft 102, a rotating inner ring structure (such as...) is included. Figure 1 and Figure 2 (as shown) and the outer ring structure (as shown) Figure 3 and Figure 4 (as shown);

[0056] In the rotating inner ring structure, the fixed shaft 102 is located on the outer periphery of the moving shaft 101. Therefore, under this structure, when installing the bearing inner ring 111 and the bearing outer ring 112, the bearing inner ring 111 is connected to the moving shaft 101 by multiple first connecting bolts 114, and the bearing outer ring 112 is connected to the fixed shaft 102 by multiple second connecting bolts 115. The bearing inner ring 111 and the moving shaft 101 are clearance-fitted, and the bearing outer ring 112 and the fixed shaft 102 are clearance-fitted.

[0057] Based on the aforementioned structure, during application, the conical main shaft system 100 of the wind turbine also includes a hub 121, a first connecting flange 122, and multiple third connecting bolts 123. The hub 121 is connected to the drive shaft 101 through the first connecting flange 122 and multiple third connecting bolts 123.

[0058] In the rotating outer ring structure, the moving shaft 101 is located on the outer periphery of the fixed shaft 102. Therefore, under this structure, when installing the bearing inner ring 111 and the bearing outer ring 112, the bearing inner ring 111 is connected to the fixed shaft 102 through multiple first connecting bolts 114, and the bearing outer ring 112 is connected to the moving shaft 101 through multiple second connecting bolts 115. The bearing inner ring 111 and the fixed shaft 102 are in clearance fit, and the bearing outer ring 112 and the moving shaft 101 are in clearance fit.

[0059] Based on the aforementioned structure, during application, the conical main shaft system 100 of the wind turbine also includes a hub 121, a generator 124, a second connecting flange 125, a nacelle 126, multiple fourth connecting bolts 127 and multiple fifth connecting bolts 128; the hub 121 is connected to the drive shaft 101 through multiple fourth connecting bolts 127; the nacelle 126 is connected to the fixed shaft 102 through the second connecting flange 125 and multiple fifth connecting bolts 128; the generator 124 is connected to the drive shaft 101 and the second connecting flange 125.

[0060] It should be noted that the above description is based on the installation arrangement of one of the bearing units 103. In this embodiment, the number of bearing units 103 can be adjusted according to the actual needs of use. Therefore, when the wind turbine conical main shaft system 100 includes multiple bearing units 103, the multiple bearing units 103 are spaced apart along the axis of the moving shaft 101 or the fixed shaft 102.

[0061] Further, please refer toFigures 1-4 Based on the above, the present invention also provides a wind turbine generator 124, comprising: the wind turbine generator 124 including the aforementioned wind turbine generator conical main shaft system 100.

[0062] By adopting the aforementioned conical main shaft system 100, the wind turbine 124 can avoid the risk of cracking in the inner and outer rings of the bearings due to interference fit. Moreover, with this configuration, the bearing unit 103 can be pre-assembled, allowing for installation and clearance adjustment at a professional bearing factory, reducing assembly errors in clearance and mitigating installation risks at the wind turbine manufacturer. Furthermore, compared to the existing structure where the shaft bends due to interference fit, the rotating shaft unit's moving shaft 101 or fixed shaft 102 can be changed from the original flared structure to a near-straight shaft structure, thus avoiding shaft bending. This prevents stress concentration at the bending point, resulting in better reliability, lighter weight, simpler structure, and lower cost.

[0063] Currently, the wind turbine main shaft system structure using single-row tapered roller bearings with double supports is gradually becoming a trend. For example... Figure 1 As shown, this is a spindle system with an existing tapered roller bearing connection structure. The inner and outer rings of the front and rear bearings 105 are connected to the spindle and bearing housing using an interference fit. With this interference fit connection structure, the inner rings of the front and rear bearings 105 and the bearing housing need to be heated during the entire spindle system installation process to generate a large expansion, thus achieving the fitting of the bearing inner and outer rings with the spindle and bearing housing.

[0064] In existing spindle systems with interference fit connections for the main bearings, during clearance adjustment, the elongation A of the end cap needs to be ground to match the relevant dimensions measured during assembly. The end cap is then tightened after grinding to ensure proper assembly clearance. The formula for calculating the end cap elongation A is: A = B - E + XG; where, after interference fit and zero clearance, the distance E from the small end face of the outer ring to the large end face of the inner ring of the rear bearing 105 is E = S. t ’ +K1δ1+K2δ2; Where: A - end cap elongation; B - distance from the small end face of the outer ring of the rear bearing 105 to the end face of the non-drive spindle; S t ’ - The distance from the small end face of the outer ring to the large end face of the inner ring of the rear bearing 105 at the time of manufacture (see...) Figure 5 and Figure 6 ); δ1 - Interference fit between the outer ring of the rear bearing 105 and the bearing housing; δ2 - Interference fit between the inner ring of the rear bearing 105 and the spindle; G - Axial preload of the front bearing 104 caused by the gravity of the bearing housing and the outer ring 112; X - Factory clearance / preload of the tapered spindle system; K1 - Interference fit coefficient of the outer ring of the rear bearing 105; K2 - Interference fit coefficient of the inner ring of the rear bearing 105.

[0065] In the formula for calculating elongation, some parameters need to be obtained through simulation, which has the following drawbacks: a. The influence of gravity on the axial preload of the front bearing 104 needs to be simulated using finite element method (FEM) simulation. However, factors such as uneven force distribution on the rollers of the front bearing 104 during actual installation can lead to a significant difference between the actual G value at the factory and the simulation value; b. The distance E between the small end face of the outer ring and the large end face of the inner ring of the rear bearing 105 under zero clearance after interference fit is related to the bearing interference fit. The coefficients K1 and K2 need to be obtained through finite element simulation. The error between the theoretical calculation value and the actual value cannot be predicted, resulting in a deviation in the elongation A value of the end cap.

[0066] For the reasons mentioned above, please refer to Figures 5-7 and combined Figures 1-4 The present invention also provides a method for adjusting the clearance of the main shaft system, which is implemented using the above-mentioned conical main shaft system 100 of the wind turbine generator, including:

[0067] 1. Initial data measurement of front bearing 104 and rear bearing 105: Place bearing unit 103 on measuring platform 131, and measure the height difference between the large end of the inner ring 111 and the small end of the outer ring 112 of the bearings in front bearing 104 and rear bearing 105 respectively, and record it as S. t and S t ’ ;

[0068] 2. Assembly of moving and fixed shafts 102: Install the inner ring 111 of the front bearing 104 onto the fixed shaft 102 using the first connecting bolt 114, and hoist it to the installation platform 132. Install the outer rings 112 of the front bearing 104 and the rear bearing 105 onto the moving shaft 101 using the second connecting bolt 115. Then hoist the moving shaft 101 and assemble it with the fixed shaft 102.

[0069] 3. Measurement of the preload of gravity on the front bearing 104 and calculation of the wear allowance of the inner ring of the rear bearing 105: Before wear allowance, install the inner ring 111 of the rear bearing 105 onto the fixed shaft 102 using the first connecting bolt 114, and align the moving shaft 101 and the fixed shaft 102. At this time, the rear bearing 105 has positive clearance. Then, rotate the bearing to ensure uniform contact of the front bearing 104. Measure the height difference between the large end of the inner ring 111 and the small end of the outer ring 112 of the front bearing 104, and record it as H. That is, the preload of gravity of the moving shaft 101 on the front bearing 104 is S. t -H;

[0070] The height difference between the large end of the inner ring 111 and the small end of the outer ring 112 of the rear bearing 105 is measured and denoted as F. The preset clearance of the entire shaft system is X, that is, the wear allowance of the width of the inner ring 111 of the rear bearing 105 is L = (FS). t ’ )+X-(S t -H);

[0071] 4. Complete shaft system installation: Based on the calculated grinding dimensions, after machining the small end face of the bearing inner ring 111 of the rear bearing 105, the bearing inner ring 111 of the rear bearing 105 is installed onto the fixed shaft 102 again using the first connecting bolt 114, and the clearance adjustment process is completed.

[0072] In summary, this spindle system installation clearance adjustment method uses actual measurement for clearance control. All variables are obtained directly from measurements. Bolted connections completely avoid the influence of interference fits on the shaft clearance. The influence of gravity on clearance can also be measured, avoiding the need to calculate interference coefficients K1 and K2 and the axial preload value G of gravity on the front bearing 104 through simulation. This makes the spindle system installation clearance more controllable.

[0073] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for adjusting the clearance of a main shaft system, implemented using a conical main shaft system of a wind turbine generator, characterized in that: The conical main shaft system of the wind turbine includes a moving shaft, a fixed shaft, and at least one bearing unit; Each bearing unit includes an inner bearing ring, an outer bearing ring, multiple bearing rollers, multiple first connecting bolts, and multiple second connecting bolts; the outer bearing ring is sleeved on the inner bearing ring, and the multiple bearing rollers are arranged in a ring array around the axis of the inner bearing ring between the inner bearing ring and the outer bearing ring; the multiple first connecting bolts are all connected to the inner bearing ring, and the multiple second connecting bolts are all connected to the outer bearing ring; The bearing inner ring is clearance-fitted with the moving shaft or the fixed shaft and is detachably connected to the moving shaft or the fixed shaft; the bearing outer ring is clearance-fitted with the fixed shaft or the moving shaft and is detachably connected to the fixed shaft or the moving shaft; the bearing inner ring is connected to the moving shaft or the fixed shaft via a plurality of first connecting bolts, and the bearing outer ring is connected to the fixed shaft or the moving shaft via a plurality of second connecting bolts; The spindle system installation clearance adjustment method includes: The bearing unit is placed on a measuring platform, and the height difference between the large end of the inner ring and the small end of the outer ring of the front and rear bearings is measured respectively, and denoted as S. t and S t ’ ; The inner ring of the front bearing is installed onto the fixed shaft using the first connecting bolt, and then hoisted to the installation platform. The outer rings of the front bearing and the rear bearing are installed onto the moving shaft using the second connecting bolt. The moving shaft is then hoisted up and fitted together with the fixed shaft. Before grinding, the inner ring of the rear bearing is installed onto the fixed shaft using the first connecting bolt. The moving shaft and the fixed shaft are then aligned. At this point, the rear bearing has positive clearance. Then, the bearing is rotated to ensure uniform contact. The height difference between the large end of the inner ring and the small end of the outer ring of the front bearing is measured and denoted as H. The preload of the weight of the moving shaft on the front bearing is S. t -H; The height difference between the large end of the inner ring and the small end of the outer ring of the rear bearing is measured and denoted as F. The preset clearance of the entire shaft system is X, that is, the wear allowance of the inner ring of the rear bearing is L = (FS). t ’ )+X-(S t -H); Based on the calculated grinding dimensions, after machining the small end face of the inner ring of the rear bearing, the inner ring of the rear bearing is then installed onto the fixed shaft again using the first connecting bolt, thus completing the clearance adjustment process.

2. The spindle system installation clearance adjustment method according to claim 1, characterized in that: The plurality of first connecting bolts are arranged in a ring array around the axis of the inner ring of the bearing, and the plurality of second connecting bolts are arranged in a ring array around the axis of the outer ring of the bearing.

3. The spindle system installation clearance adjustment method according to claim 2, characterized in that: The inner ring of the bearing is connected to the moving shaft by a plurality of first connecting bolts, and the outer ring of the bearing is connected to the fixed shaft by a plurality of second connecting bolts. The inner ring of the bearing is clearance-fitted with the moving shaft, and the outer ring of the bearing is clearance-fitted with the fixed shaft.

4. The spindle system installation clearance adjustment method according to claim 3, characterized in that: The conical main shaft system of the wind turbine also includes a hub, a first connecting flange and a plurality of third connecting bolts, wherein the hub is connected to the drive shaft through the first connecting flange and the plurality of third connecting bolts.

5. The spindle system installation clearance adjustment method according to claim 2, characterized in that: The inner ring of the bearing is connected to the fixed shaft via a plurality of first connecting bolts, and the outer ring of the bearing is connected to the moving shaft via a plurality of second connecting bolts. The inner ring of the bearing is clearance-fitted with the fixed shaft, and the outer ring of the bearing is clearance-fitted with the moving shaft.

6. The spindle system installation clearance adjustment method according to claim 5, characterized in that: The conical main shaft system of the wind turbine also includes a hub, a generator, a second connecting flange, a nacelle, multiple fourth connecting bolts, and multiple fifth connecting bolts; The hub is connected to the drive shaft via multiple fourth connecting bolts; The engine compartment is connected to the fixed shaft via the second connecting flange and a plurality of the fifth connecting bolts; the generator is connected to the moving shaft and the second connecting flange.

7. The spindle system mounting clearance adjustment method according to any one of claims 1-6, characterized in that: The conical main shaft system of the wind turbine includes multiple bearing units; the multiple bearing units are spaced apart along the axis of the moving shaft or the fixed shaft.

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