Main shaft for wind turbine generator and wind turbine generator

Abstract

The invention provides a main shaft for a wind turbine generator and the wind turbine generator, and relates to the technical field of wind turbine generators. The main shaft comprises a main shaft body and an assembling support used for fixing a cable, the main shaft body is oppositely provided with a first flange and a second flange in the axial direction of the main shaft body, the first flange is located on the inner side of the main shaft body, and the second flange is located on the outer side of the main shaft body; the assembling support is arranged in the main shaft body, the two ends of the assembling support are connected with the first flange and the second flange respectively, the assembling support is fixedly connected with the inner wall of the main shaft body, the structural form of the main shaft is optimized, then the machining efficiency is improved, and the production period is shortened.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbines, and in particular to a main shaft for a wind turbine and a wind turbine. Background Art

[0002] With the development of larger wind turbines, the wall thickness of large castings such as hubs and main shafts required for wind turbines is getting thicker and thicker, and the difficulty of casting processing is also rising sharply, making it impossible to deliver casting products on time, affecting the overall production cycle of the unit.

[0003] As one of the four major castings of the fan, the main shaft is the main rotating component of the transmission chain. The stress level of the main shaft is relatively high, and it is impossible to drill holes directly on the wall for wiring. Therefore, its internal wiring structure is generally to set multiple casting bosses on the inner wall of the main shaft, and fix the wiring plate to the multiple casting bosses with bolts. In this wiring structure, the existence of the casting boss makes it impossible to form the inner side of the main shaft in one cut, and the main shaft processing is difficult and the process is cumbersome. In addition, due to the limitation of the inner wall size, the surface treatment of the boss and the hole positioning cannot be completed by machining, and can only be achieved by benchwork. The processing accuracy is poor and the operation time is long, which seriously affects the production progress. Summary of the invention

[0004] The purpose of the present application includes, for example, providing a main shaft for a wind turbine generator set, which optimizes the structural form, thereby improving the processing efficiency and shortening the production cycle.

[0005] The purpose of the present application also includes providing a wind turbine generator set which can optimize the structural form of the main shaft, thereby improving the processing efficiency and shortening the production cycle.

[0006] The embodiments of the present application can be implemented as follows:

[0007] An embodiment of the present application provides a main shaft for a wind turbine generator set, which includes a main shaft body and an assembly bracket for fixing cables, wherein the main shaft body is provided with a first flange and a second flange opposite to each other along its own axial direction, the first flange is located on the inner side of the main shaft body, and the second flange is located on the outer side of the main shaft body; the assembly bracket is arranged inside the main shaft body, and the two ends of the assembly bracket are respectively connected to the first flange and the second flange, and the assembly bracket is fixedly connected to the inner wall of the main shaft body.

[0008] Optionally, the assembly bracket is magnetically connected or adhesively bonded to the inner wall of the spindle body.

[0009] Optionally, the assembly bracket includes a first assembly bracket and a second assembly bracket, the first assembly bracket and the second assembly bracket are arranged along the axial direction of the main shaft body, one end of the first assembly bracket away from the second assembly bracket is connected to the first flange, one end of the second assembly bracket away from the first assembly bracket is connected to the second flange, and one end of the first assembly bracket close to the second assembly bracket and one end of the second assembly bracket close to the first assembly bracket are both fixedly connected to the inner wall of the main shaft body.

[0010] Optionally, the first assembly bracket and the second assembly bracket both include a connected bending part and a plate part, a magnetic block is provided at one end of the bending part away from the plate part, and the magnetic block is magnetically connected to the inner wall of the spindle body, the first assembly bracket and the second assembly bracket both include a first fastener, and the plate part and the first flange in the first assembly bracket and the plate part and the second flange in the second assembly bracket are connected via the first fastener.

[0011] Optionally, a fixing plate is provided at one end of the bending member away from the magnetic attraction block, and a waist-shaped hole is provided on the plate member, and the waist-shaped hole extends along the radial direction of the main shaft body;

[0012] The first assembly bracket and the second assembly bracket both include a second fastener, and the second fastener penetrates the fixing plate and the waist-shaped hole at the same time, so that the fixing plate and the plate are relatively fixed.

[0013] Optionally, the bending member includes a plurality of continuous bending portions, and two adjacent bending portions are bent relative to each other. The plate is connected to the bending portion at one end, and the magnetic block is arranged on the bending portion at the other end.

[0014] Optionally, the angle between any two adjacent bent portions in the first assembly bracket is smaller than the angle between any two adjacent bent portions in the second assembly bracket;

[0015] The bent portion in the first assembly bracket is tubular, and the bent portion in the second assembly bracket includes a sheet body and folded edges arranged on two sides of the sheet body.

[0016] Optionally, in the first assembly bracket, a connecting piece is provided at the end of the bent portion away from the plate, and the magnetic attraction block is provided on the surface of the connecting piece facing the inner wall of the main shaft body;

[0017] In the second assembly bracket, the magnetic block is arranged on a surface of the inner wall of the sheet body facing the main shaft body away from the plate.

[0018] Optionally, the first assembly bracket and the second assembly bracket both include a third fastener, and the third fastener in the first assembly bracket simultaneously passes through the magnetic block and the connecting plate to relatively fix the magnetic block and the connecting plate; the third fastener in the second assembly bracket simultaneously passes through the magnetic block and the sheet body to relatively fix the magnetic block and the sheet body.

[0019] Optionally, the bent portion in the first assembly bracket and the folded edge in the second assembly bracket are both provided with through holes for passing a cable tie.

[0020] The present application also provides a wind turbine generator set, comprising the main shaft for the wind turbine generator set.

[0021] The main shaft for wind turbines and the beneficial effects of the wind turbines provided by the embodiments of the present application include, for example: in order to optimize the structural form of the main shaft, improve processing efficiency, and shorten the production cycle, a main shaft for wind turbines is designed, the main shaft includes a main shaft body and an assembly bracket for fixing cables, the main shaft body is provided with a first flange and a second flange along its own axial direction, the first flange is located on the inner side of the main shaft body, and the second flange is located on the outer side of the main shaft body; the assembly bracket is arranged inside the main shaft body, the two ends of the assembly bracket are respectively connected to the first flange and the second flange, and the assembly bracket is fixedly connected to the inner wall of the main shaft body. In the process of arranging the wiring, the two ends of the assembly bracket are respectively connected to the first flange and the second flange, and the assembly bracket is fixedly connected to the inner wall of the main shaft body, so that the assembly bracket is fixed, and the cable can be fixed on the assembly bracket during wiring. Since the main shaft cancels the casting boss structure on its own inner wall, the assembly bracket is directly fixedly connected to the inner wall of the main shaft body, which optimizes the structural form of the main shaft, improves processing efficiency, and shortens the production cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural schematic diagram of the main shaft in the prior art;

[0024] Figure 2 This is a schematic diagram of the structure of the main shaft in the embodiment of the present application;

[0025] Figure 3 This is a cross-sectional view used to show the internal structure of the main shaft in the embodiment of the present application;

[0026] Figure 4 This is a schematic diagram of the structure of the first assembly bracket in the embodiment of the present application;

[0027] Figure 5 A partial exploded structural diagram of the first assembly bracket in the embodiment of the present application;

[0028] Figure 6 Schematic diagram of the structure of the second assembly bracket in the embodiment of the present application.

[0029] Icons: 100-spindle body; 110-first flange; 120-second flange; 200-first assembly bracket; 210-connecting plate; 300-second assembly bracket; 400-bending part; 410-magnetic block; 420-fixing plate; 430-bending part; 431-sheet body; 432-folded edge; 440-through hole; 500-plate; 510-waist-shaped hole; 600-first fastener; 700-second fastener; 800-third fastener; 900-cable. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0035] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0036] The inventor of the present application found that the stress level of the main shaft in the wind turbine is relatively high, and it is impossible to drill holes directly on the wall of the main shaft for wiring. Figure 1 As shown, the existing internal wiring structure of the main shaft 1 is generally to set multiple casting bosses 2 on the inner wall of the main shaft 1, and fix the wiring board 3 to the multiple casting bosses 2 by bolts. In this wiring structure, the existence of the casting bosses 2 makes it impossible to form the inner side of the main shaft 1 with one cut, and the main shaft 1 is difficult to process and the process is cumbersome. In addition, due to the size of the inner wall of the main shaft 1, the surface treatment of the boss 2 and the hole positioning cannot be completed by machining, but can only be achieved by benchwork, with poor processing accuracy and long operation time, which seriously affects the production progress. The embodiment of the present application provides a main shaft for a wind turbine, which is at least used to solve the above-mentioned technical problems.

[0037] Please refer to Figure 2 , Figure 3 The main shaft for a wind turbine provided in an embodiment of the present application includes a main shaft body 100 and an assembly bracket for fixing a cable 900. The main shaft body 100 is provided with a first flange 110 and a second flange 120 opposite to each other along its own axial direction. The first flange 110 is located on the inner side of the main shaft body 100, and the second flange 120 is located on the outer side of the main shaft body 100; the assembly bracket is arranged inside the main shaft body 100, and the two ends of the assembly bracket are respectively connected to the first flange 110 and the second flange 120, and the assembly bracket is fixedly connected to the inner wall of the main shaft body 100.

[0038] The interior of the spindle body 100 is hollow, and the first flange 110 and the second flange 120 are both integrally formed with the spindle body 100. The inner diameter of the first flange 110 is smaller than the inner diameter of the spindle body 100, and the outer diameter of the second flange 120 is larger than the outer diameter of the spindle body 100. One end of the assembly bracket is connected to the surface of the first flange 110 facing the second flange 120, and the other end of the assembly bracket is connected to the surface of the second flange 120 away from the first flange 110. The part of the assembly bracket close to the middle of the spindle body 100 is connected to the inner wall of the spindle body 100 by magnetic attraction. The cable 900 extends from the first flange 110 into the spindle body 100, is routed along the extension direction of the assembly bracket and is fixed to the assembly bracket, and finally extends from the second flange 120 to the outside of the spindle body 100, and the two ends of the cable 900 are respectively connected to other external components.

[0039] During the wiring arrangement, the two ends of the assembly bracket are respectively connected to the first flange 110 and the second flange 120, and the assembly bracket is fixedly connected to the inner wall of the main shaft body 100, so that the assembly bracket is fixed. When routing, the cable 900 is arranged along the extension direction of the assembly bracket and fixed on the assembly bracket. Since the main shaft eliminates the cast boss structure on its own inner wall, the assembly bracket is directly fixedly connected to the inner wall of the main shaft body 100, which optimizes the structure of the main shaft, improves the processing efficiency, and shortens the production cycle.

[0040] In some optional embodiments, the assembly bracket is magnetically connected or bonded to the inner wall of the spindle body 100, wherein the bonding can be achieved by using an adhesive with high viscosity; or, an inner lining ring is provided inside the spindle body 100, and the inner lining ring coincides with the axis of the spindle body 100, and the diameter of the inner lining ring is smaller than the inner diameter of the spindle body 100, and the inner lining ring presses and fixes the assembly bracket to the inner wall of the spindle body 100.

[0041] In this embodiment, the assembly bracket includes a first assembly bracket 200 and a second assembly bracket 300, and the first assembly bracket 200 and the second assembly bracket 300 are arranged along the axial direction of the main shaft body 100, and the end of the first assembly bracket 200 away from the second assembly bracket 300 is connected to the first flange 110, and the end of the second assembly bracket 300 away from the first assembly bracket 200 is connected to the second flange 120, and the end of the first assembly bracket 200 close to the second assembly bracket 300 and the end of the second assembly bracket 300 close to the first assembly bracket 200 are both fixedly connected to the inner wall of the main shaft body 100.

[0042] By providing an independent first assembly bracket 200 and a second assembly bracket 300, when installing the first assembly bracket 200, the end of the first assembly bracket 200 away from the second assembly bracket 300 is connected to the first flange 110, and the end of the first assembly bracket 200 close to the second assembly bracket 300 is fixedly connected to the inner wall of the spindle body 100; when installing the second assembly bracket 300, the end of the second assembly bracket 300 away from the first assembly bracket 200 is connected to the second flange 120, and the end of the second assembly bracket 300 close to the first assembly bracket 200 is fixedly connected to the inner wall of the spindle body 100, and the first assembly bracket 200 and the second assembly bracket 300 are installed separately, thereby reducing the difficulty of installation.

[0043] Please refer to Figure 4-Figure 6In this embodiment, taking the magnetic connection between the assembly bracket and the inner wall of the spindle body 100 as an example, the first assembly bracket 200 and the second assembly bracket 300 both include a connected bending member 400 and a plate member 500, and a magnetic block 410 is provided at one end of the bending member 400 away from the plate member 500, and the magnetic block 410 is magnetically connected to the inner wall of the spindle body 100, and the first assembly bracket 200 and the second assembly bracket 300 both include a first fastener 600, and the plate member 500 in the first assembly bracket 200 and the first flange 110 and the plate member 500 in the second assembly bracket 300 and the second flange 120 are both connected via the first fastener 600.

[0044] The plate 500 is connected to one end of the bending part 400. The magnetic block 410 has a strong magnetic force and a friction coefficient greater than 0.6. The magnetic connection between the magnetic block 410 and the inner wall of the spindle body 100 can play an anti-slip role. The number of magnetic blocks 410 can be one or more, and there is no limitation on this.

[0045] The first fastener 600 may optionally include a bolt and a self-locking washer. The plate 500 in the first assembly bracket 200 is connected to the first flange 110 through the first fastener 600, and the plate 500 in the second assembly bracket 300 is also connected to the second flange 120 through the first fastener 600, which can effectively prevent the plate 500 from loosening or falling off.

[0046] It is understandable that in other embodiments, the first fastener 600 may also be a fastener such as a snap, as long as it can fix the panel 500 in the first assembly bracket 200 to the first flange 110 and the panel 500 in the second assembly bracket 300 to the second flange 120, without limitation.

[0047] The magnetic block 410 can be selected through finite element calculation and analysis according to the suction force and lateral sliding force required by the design to meet the installation requirements of the wiring bracket inside the main shaft of different wind turbines and ensure the strength and fatigue life of the overall structure of the assembly bracket.

[0048] In this embodiment, a fixing plate 420 is provided at one end of the bending part 400 away from the magnetic block 410, and a waist-shaped hole 510 is opened on the plate 500, and the waist-shaped hole 510 extends radially along the main shaft body 100; the first assembly bracket 200 and the second assembly bracket 300 both include a second fastener 700, and the second fastener 700 is simultaneously penetrated by the fixing plate 420 and the waist-shaped hole 510 to relatively fix the fixing plate 420 and the plate 500.

[0049] The opening direction of the waist-shaped hole 510 is perpendicular to the plate 500. The number of waist-shaped holes 510 opened on the plate 500 is more than two. The number of second fasteners 700 included in the first assembly bracket 200 and the second assembly bracket 300 matches the number of waist-shaped holes 510. The second fastener 700 includes bolts, washers and nuts. Washers can be set on both sides of the plate 500.

[0050] By opening the waist-shaped hole 510 on the plate 500 , the bending member 400 can be adjusted relative to the plate 500 along the radial direction of the spindle body 100 to offset the design error caused by the wall thickness tolerance of the spindle body 100 .

[0051] Exemplarily, four waist-shaped holes 510 are opened on the plate 500, and the four waist-shaped holes 510 all extend along the radial direction of the main shaft body 100. The first assembly bracket 200 and the second assembly bracket 300 both include four second fasteners 700. The bolts in each second fastener 700 are simultaneously passed through the fixing plate 420 and the corresponding waist-shaped hole 510, and the nuts cooperate with the bolts to relatively fix the fixing plate 420 and the plate 500.

[0052] It is understandable that the number of the waist-shaped holes 510 may be determined according to actual needs. For example, the number of the waist-shaped holes 510 may be two, three, or more than five, and there is no limitation on this.

[0053] In this embodiment, the bending member 400 includes a plurality of continuous bending portions 430 , and two adjacent bending portions 430 are bent relative to each other. The plate 500 is connected to the bending portion 430 at one end, and a magnetic block 410 is disposed on the bending portion 430 at the other end.

[0054] The bending part 400, as the main load-bearing part, needs to overcome the centrifugal force and deformation during the rotation of the main shaft. Therefore, the bending part 400 is designed to include a continuous multi-segment bending portion 430, which can reduce the deformation to a certain extent during the rotation of the main shaft, ensure the rotational stiffness of the assembly bracket, and avoid the breakage of the cable 900 due to excessive deformation.

[0055] Exemplarily, the bending member 400 includes three continuous bending portions 430 , wherein the middle bending portion 430 is inclined, and the remaining two bending portions 430 extend in opposite directions, and there is a smooth transition between two adjacent bending portions 430 .

[0056] It is understandable that the number of the bending portions 430 may be determined according to actual needs. For example, the number of the bending portions 430 may be more than four, and there is no limitation to this.

[0057] In this embodiment, the angle between any two adjacent bent portions 430 in the first assembly bracket 200 is smaller than the angle between any two adjacent bent portions 430 in the second assembly bracket 300; the bent portion 430 in the first assembly bracket 200 is tubular, and the bent portion 430 in the second assembly bracket 300 includes a sheet 431 and folded edges 432 arranged on both sides of the sheet 431.

[0058] It should be noted that the angles between any two adjacent bent portions 430 in the first assembly bracket 200 are substantially equal, and the angles between any two adjacent bent portions 430 in the second assembly bracket 300 are substantially equal; the plate 500 in the first assembly bracket 200 is connected to the inner side of the first flange 110, so the bending degree between the two adjacent bent portions 430 is greater, and the angle between the two adjacent bent portions 430 is smaller; the plate 500 in the second assembly bracket 300 is connected to the inner side of the second flange 120, so the bending degree between the two adjacent bent portions 430 is smaller, and the angle between the two adjacent bent portions 430 is larger, that is, the angle between any two adjacent bent portions 430 in the first assembly bracket 200 is smaller than the angle between any two adjacent bent portions 430 in the second assembly bracket 300.

[0059] Since the angle between two adjacent bent portions 430 in the second assembly bracket 300 is small, the bent portion 430 in the second assembly bracket 300 is designed to include a sheet 431 and a folded edge 432 perpendicular to the sheet 431, which can ensure the stiffness requirements in different directions during the rotation of the main shaft and reduce deformation to a certain extent; and since the bending degree between two adjacent bent portions 430 in the first assembly bracket 200 is large, the bent portion 430 is designed to be tubular, for example, a steel pipe with good circumferential stiffness is used to make the bent part 400, so as to further strengthen the resistance to deformation that may occur during the rotation of the main shaft.

[0060] In the first assembly bracket 200, a connecting piece 210 is provided at the end of the bent portion 430 away from the plate 500, the magnetic block 410 is provided on the surface of the connecting piece 210 facing the inner wall of the main shaft body 100, and a fixing piece 420 is provided at the end of the bent portion 430 close to the plate 500; in the second assembly bracket 300, the magnetic block 410 is provided on the surface of the sheet body 431 away from the plate 500 facing the inner wall of the main shaft body 100, and a fixing piece 420 is provided on the sheet body 431 close to the plate 500, and the fixing piece 420 can be integrally formed with the sheet body 431 and is bent relative to the sheet body 431.

[0061] The side of the connecting piece 210 facing the inner wall of the spindle body 100 and the side of the sheet 431 away from the plate 500 facing the inner wall of the spindle body 100 are the adsorption side, and the side of the connecting piece 210 away from the inner wall of the spindle body 100 and the side of the sheet 431 away from the plate 500 away from the inner wall of the spindle body 100 are the shielding side. The connecting piece 210 and the sheet 431 away from the plate 500 are respectively fixed to the inner wall of the spindle body 100 by the magnetic suction block 410 on the adsorption side. There is no suction on the shielding side of the connecting piece 210 and the sheet 431 away from the plate 500, and there is no interference with the signal of the cable 900.

[0062] In this embodiment, the first assembly bracket 200 and the second assembly bracket 300 both include a third fastener 800. The third fastener 800 in the first assembly bracket 200 simultaneously passes through the magnetic block 410 and the connecting plate 210 to relatively fix the magnetic block 410 and the connecting plate 210; the third fastener 800 in the second assembly bracket 300 simultaneously passes through the magnetic block 410 and the sheet body 431 to relatively fix the magnetic block 410 and the sheet body 431.

[0063] The third fastener 800 may optionally include a stud, a nut and a washer. The stud in the first assembly bracket 200 passes through the connecting plate 210 and is connected to the magnetic block 410. The nut cooperates with the stud to relatively fix the magnetic block 410 and the connecting plate 210. The stud in the second assembly bracket 300 passes through the sheet 431 and is connected to the magnetic block 410. The nut cooperates with the stud to relatively fix the magnetic block 410 and the sheet 431.

[0064] In this embodiment, a through hole 440 for passing a cable tie is formed on the bent portion 430 of the first assembly bracket 200 and the folded edge 432 of the second assembly bracket 300 .

[0065] In the first assembly bracket 200, a plurality of through holes 440 are provided at intervals along the side surfaces of the multi-section bending portion 430, and each through hole 440 is used to pass a cable tie, which is passed through the through hole 440 and fixes the cable 900 to the bending portion 430; in the second assembly bracket 300, a plurality of through holes 440 are provided at intervals along the extension direction of the folded edges 432 on the folded edges 432 on both sides of the sheet 431 of the second assembly bracket 300, and two through holes 440 corresponding to the positions on the two folded edges 432 are used to pass the same cable tie, which is passed through the through hole 440 and fixes the cable 900 to the sheet 431.

[0066] The technical effects of the main shaft for a wind turbine provided by the embodiment of the present application include at least: the main shaft requires less additional processing, has a low cost, and is suitable for mass production; the main shaft is suitable for wind turbines of various categories and different megawatt levels, such as doubly fed models and semi-direct drive models; the main shaft eliminates the internal wiring boss, the main shaft has less processing, and the production efficiency is significantly improved, which can greatly shorten the production cycle of a single main shaft; the main body of the assembly bracket is in the form of a bending part 400, which can effectively overcome the slippage and deformation of the assembly bracket during the rotation of the main shaft, and ensure the stability and safety of the assembly bracket and the cable 900; a waist-shaped hole 510 is opened on the plate 500, which can effectively adjust the relative height of the bending part 400, thereby offsetting the design error caused by the wall thickness tolerance of the main shaft.

[0067] An embodiment of the present application further provides a wind turbine generator set, comprising the above-mentioned main shaft for a wind turbine generator set. The technical effect of the wind turbine generator set is substantially the same as the technical effect of the main shaft for a wind turbine generator set, and will not be described in detail herein.

[0068] In summary, the embodiment of the present application provides a main shaft and a wind turbine generator set. In the process of arranging the wiring, the end of the first assembly bracket 200 away from the second assembly bracket 300 is connected to the first flange 110, and the end of the first assembly bracket 200 close to the second assembly bracket 300 is directly fixedly connected to the inner wall of the main shaft body 100; and the end of the second assembly bracket 300 away from the first assembly bracket 200 is connected to the second flange 120, and the end of the second assembly bracket 300 close to the first assembly bracket 200 is directly fixedly connected to the inner wall of the main shaft body 100. The cable 900 is arranged along the arrangement direction of the first assembly bracket 200 and the second assembly bracket 300 and fixed on the first assembly bracket 200 and the second assembly bracket 300. Since the casting boss structure is eliminated in the main shaft, the structural form of the main shaft is optimized, the processing efficiency is improved, and the production cycle is shortened.

[0069] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A main shaft for a wind turbine generator set, characterized in that: The invention comprises a main shaft body (100) and an assembly bracket for fixing a cable (900), wherein the main shaft body (100) is provided with a first flange (110) and a second flange (120) opposite to each other along its own axial direction, wherein the first flange (110) is located on the inner side of the main shaft body (100), and the second flange (120) is located on the outer side of the main shaft body (100); the assembly bracket is arranged inside the main shaft body (100), and the two ends of the assembly bracket are respectively connected to the first flange (110) and the second flange (120), and the assembly bracket is fixedly connected to the inner wall of the main shaft body (100).

2. The main shaft for a wind turbine according to claim 1, characterized in that: The assembly bracket is magnetically connected or bonded to the inner wall of the main shaft body (100).

3. The main shaft for a wind turbine according to claim 1, characterized in that: The assembly bracket comprises a first assembly bracket (200) and a second assembly bracket (300), the first assembly bracket (200) and the second assembly bracket (300) are arranged along the axial direction of the main shaft body (100), one end of the first assembly bracket (200) away from the second assembly bracket (300) is connected to the first flange (110), and one end of the second assembly bracket (300) away from the first assembly bracket (200) is connected to the second flange (120), and one end of the first assembly bracket (200) close to the second assembly bracket (300) and one end of the second assembly bracket (300) close to the first assembly bracket (200) are both fixedly connected to the inner wall of the main shaft body (100).

4. The main shaft for a wind turbine according to claim 3, characterized in that: The first assembly bracket (200) and the second assembly bracket (300) both comprise a bending piece (400) and a plate piece (500) connected to each other; a magnetic attraction block (410) is provided at one end of the bending piece (400) away from the plate piece (500); and the magnetic attraction block (410) is magnetically connected to the inner wall of the spindle body (100); The first assembly bracket (200) and the second assembly bracket (300) both include a first fastener (600), and the plate (500) and the first flange (110) in the first assembly bracket (200) and the plate (500) and the second flange (120) in the second assembly bracket (300) are both connected via the first fastener (600).

5. The main shaft for a wind turbine according to claim 4, characterized in that: A fixing sheet (420) is provided at one end of the bending member (400) away from the magnetic attraction block (410), and a waist-shaped hole (510) is provided on the plate member (500), and the waist-shaped hole (510) extends along the radial direction of the main shaft body (100); The first assembly bracket (200) and the second assembly bracket (300) both include a second fastener (700), and the second fastener (700) simultaneously penetrates the fixing plate (420) and the waist-shaped hole (510) so as to relatively fix the fixing plate (420) and the plate (500).

6. The main shaft for a wind turbine according to claim 4, characterized in that: The bending member (400) comprises a plurality of continuous bending portions (430), two adjacent bending portions (430) being bent relative to each other, the plate member (500) being connected to the bending portion (430) at one end, and the magnetic attraction block (410) being arranged on the bending portion (430) at the other end.

7. The main shaft for a wind turbine according to claim 6, characterized in that: The angle between any two adjacent sections of the bending portions (430) in the first assembly bracket (200) is smaller than the angle between any two adjacent sections of the bending portions (430) in the second assembly bracket (300); The bent portion (430) in the first assembly bracket (200) is tubular, and the bent portion (430) in the second assembly bracket (300) comprises a sheet (431) and folded edges (432) arranged on two sides of the sheet (431) opposite to each other.

8. The main shaft for a wind turbine according to claim 7, characterized in that: In the first assembly bracket (200), a connecting piece (210) is provided at the end of the bent portion (430) away from the plate (500), and the magnetic attraction block (410) is provided on the surface of the connecting piece (210) facing the inner wall of the main shaft body (100); In the second assembly bracket (300), the magnetic attraction block (410) is arranged on a surface of the inner wall of the sheet (431) away from the plate (500) and facing the main shaft body (100).

9. The main shaft for a wind turbine according to claim 8, characterized in that: The first assembly bracket (200) and the second assembly bracket (300) both include a third fastener (800); the third fastener (800) in the first assembly bracket (200) simultaneously passes through the magnetic block (410) and the connecting sheet (210) so that the magnetic block (410) and the connecting sheet (210) are relatively fixed; the third fastener (800) in the second assembly bracket (300) simultaneously passes through the magnetic block (410) and the sheet body (431) so that the magnetic block (410) and the sheet body (431) are relatively fixed.

10. The main shaft for a wind turbine according to claim 7, characterized in that: The bent portion (430) in the first assembly bracket (200) and the folded edge (432) in the second assembly bracket (300) are both provided with through holes (440) for passing a cable tie.

11. A wind turbine generator set, characterized in that: The invention comprises a main shaft for a wind turbine generator set as claimed in any one of claims 1 to 10.

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