Main shaft and wind generating set

Abstract

The invention provides a main shaft and a wind generating set, and relates to the technical field of wind power generation equipment. The rigidity of the main shaft system can be improved on the premise that the strength of the main shaft body is not affected. The main shaft comprises a hollow shaft and a reinforcing plug; wherein the hollow shaft comprises a sleeving section, so that the mounting piece on the shaft is arranged outside the sleeving section in a sleeving manner; the reinforcing plug comprises an outer sleeve part and an inner plug part, the outer sleeve part is sleeved with the hollow shaft, at least part of the outer sleeve part is opposite to the sleeving section in the radial direction of the hollow shaft, an insertion opening is formed in the end, in the axial direction of the hollow shaft, of the outer sleeve part, and at least part of the inner plug part is inserted into the outer sleeve part. The outer sleeve piece is formed by splicing a plurality of outer sleeve sub-pieces in the circumferential direction of the hollow shaft. And / or the inner plug piece is formed by splicing a plurality of inner plug pieces in the circumferential direction of the hollow shaft. The main shaft and the wind generating set are used for improving the rigidity of a main shaft system.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of wind power generation equipment technology, and particularly to a main shaft and a wind turbine generator set. Background Technology

[0002] Wind power generation refers to the conversion of the kinetic energy of wind into mechanical kinetic energy, and then into electrical kinetic energy. It involves the wind turbine rotating under the action of wind, converting the kinetic energy of the wind into the mechanical energy of the wind turbine shaft, and the generator rotating under the drive of the wind turbine shaft to generate electricity. It is an important form of wind energy utilization.

[0003] As wind turbines and bearings become larger, the wind load they experience also gradually increases. When the low-speed main shaft system in a wind turbine generator set has poor rigidity, it can lead to a series of adverse conditions such as large deformation of various components and relative slippage, which can seriously affect the service life of the low-speed main shaft system.

[0004] Existing technologies typically include a mounting groove, and the rigidity of the spindle is improved by adding fastening structures within the mounting groove. However, this method reduces the load-bearing capacity of the shaft system and the strength of the main body, resulting in poor reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a main shaft and a wind turbine generator set, aiming to solve the problem of how to improve the stiffness of a low-speed main shaft without affecting the strength of the main body.

[0006] To solve the above-mentioned technical problems, embodiments of the present invention provide a spindle, the spindle comprising: a hollow shaft and a reinforcing plug; wherein, the hollow shaft includes a sleeve section, the sleeve section being used for an interference fit with a shaft mounting component to fit the shaft mounting component outside the sleeve section; the reinforcing plug includes an outer sleeve and an inner plug, the outer sleeve being fitted inside the hollow shaft, the outer sleeve and the hollow shaft being an interference fit, at least a portion of the outer sleeve being radially opposite to the sleeve section of the hollow shaft, and the outer sleeve having an insertion port for inserting the inner plug at one axial end of the hollow shaft, at least a portion of the inner plug being inserted into the outer sleeve, the inner plug and the outer sleeve being an interference fit. The outer sleeve is formed by splicing multiple outer sleeve components along the circumference of the hollow shaft; and / or, the inner plug is formed by splicing multiple inner plug components along the circumference of the hollow shaft.

[0007] In some embodiments, each of the outer sleeves has a protruding abutment on its surface near the central axis of the hollow shaft, the abutment abutting against the side of the inner plug away from the insertion port.

[0008] In some embodiments, the abutting portion is arranged in a fan shape extending circumferentially along the outer sleeve; and / or, the abutting portions of a plurality of the outer sleeves are spliced ​​together circumferentially along the hollow shaft.

[0009] In some embodiments, each of the inner plug components has a protruding boss on its end face away from the insertion port, wherein: the bosses of the plurality of inner plug components are spliced ​​together with each other along the circumference of the hollow shaft; and / or, the abutting portions of the plurality of outer plug components are arranged circumferentially on one side of the bosses of the plurality of inner plug components away from the central axis of the hollow shaft.

[0010] In some embodiments, each of the abutment portions is provided with a mounting hole extending circumferentially along the hollow shaft, and a connector capable of moving axially along the hollow shaft is inserted into the mounting hole. The end of the connector away from the insertion port is located on the side of the abutment portion away from the inner plug, and the end of the connector near the insertion port is disposed on one of the inner plugs.

[0011] In some embodiments, the connector is a screw-in connector, and the end face of the inner plug component away from the insertion port is provided with a threaded hole that is threadedly connected to the screw-in connector.

[0012] In some embodiments, each of the outer sleeve components is connected to N adjacent inner sleeve components via N connectors; and / or, each of the inner sleeve components is connected to M adjacent outer sleeve components via M connectors.

[0013] In some embodiments, the number of outer sleeve components is equal to the number of inner plug components; and / or, the joints of the plurality of outer sleeve components and the joints of the plurality of inner plug components are staggered circumferentially on the hollow shaft.

[0014] In some embodiments, the end of the inner plug near the insertion port is located within the outer sleeve.

[0015] In some embodiments, the surfaces of a plurality of inner plug components near the central axis of the hollow shaft are joined together along the circumference of the hollow shaft to form a through hole. The through hole is a circular hole or a polygonal hole.

[0016] In some embodiments, the inner circumferential side of the hollow shaft is provided with an annular stop surface facing the reinforcing plug, the annular stop surface abutting against the side of the plurality of outer sleeves near the insertion port.

[0017] In some embodiments, an annular groove is provided at the edge of the annular stop surface.

[0018] In some embodiments, a plurality of reinforcing plugs are provided along the axial direction of the hollow shaft.

[0019] In some embodiments, the insertion ports of the plurality of reinforcing plugs are oriented in the same direction; and / or, two adjacent reinforcing plugs abut against each other in the axial direction of the hollow shaft.

[0020] This application embodiment also provides a wind turbine generator set, which includes: a main shaft and a shaft mounting component; wherein, the shaft mounting component is fitted onto a sleeve section of the main shaft, and the shaft mounting component and the sleeve section are interference-fitted, and at least a portion of the shaft mounting component is radially opposite to a reinforcing plug of the main shaft. The shaft mounting component is a bearing.

[0021] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a main shaft and wind turbine generator set. Due to the inclusion of a hollow shaft, it connects to external components such as bearings, brake discs of the braking device, and planetary carriers, and provides mounting points for other main shaft components. The inclusion of reinforcing plugs, with the inner plug component of the reinforcing plug being inserted into the outer sleeve via an interference fit, and the outer sleeve component of the reinforcing plug being inserted into the hollow shaft via an interference fit, increases the tension force of both the outer sleeve and the hollow shaft, further expanding the bearings on the outer side of the hollow shaft. Furthermore, the main shaft of this invention features a split structure for the reinforcing plug, comprising multiple outer sleeve components and multiple inner plug components, increasing the rigidity of the main shaft while maintaining its strength, thereby extending the service life of the main shaft and other components. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 This is a schematic diagram of the overall structure of the main shaft and wind turbine generator set according to the present invention; Figure 2 for Figure 1 A sectional view; Figure 3 for Figure 1 A structural diagram of the outer garment component; Figure 4 for Figure 1 A schematic diagram of the inner plug component; Figure 5 for Figure 1 A schematic diagram of the hollow shaft in the diagram.

[0024] Explanation of reference numerals in the accompanying drawings of this invention: 1-Hollow shaft; 11-First mounting cavity; 12-Second mounting cavity; 2-Reinforcing plug; 21-Outer sleeve; 211-Outer sleeve piece; 2111-Abutting part; 22-Inner plug piece; 221-Inner plug piece; 2211-Boss; 3-Mounting hole; 4-Connector; 5-Annular stop surface; 6-Annular groove.

[0025] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0029] This invention provides a spindle, such as Figure 1 and Figure 2As shown, the spindle includes a hollow shaft 1 and a reinforcing plug 2. The hollow shaft 1 includes a sleeve section for interference fit with a mounting component on the shaft, allowing the mounting component to be fitted onto the sleeve section. The reinforcing plug 2 includes an outer sleeve 21 and an inner plug 22. The outer sleeve 21 is fitted inside the hollow shaft 1, with an interference fit between the outer sleeve 21 and the hollow shaft 1. At least a portion of the outer sleeve 21 is radially opposite to the sleeve section of the hollow shaft 1. One axial end of the outer sleeve 21 has an insertion port for the inner plug 22, with at least a portion of the inner plug 22 inserted into the outer sleeve 21, also with an interference fit between the inner plug 22 and the outer sleeve 21. The outer sleeve 21 is formed by splicing multiple outer sleeve pieces 211 along the circumference of the hollow shaft 1; and / or, the inner plug 22 is formed by splicing multiple inner plug pieces 221 along the circumference of the hollow shaft 1.

[0030] For example, the spindle includes a hollow shaft 1, which mainly serves to bear and transmit torque. The hollow shaft 1 includes a mounting section for mounting other parts. For instance, the mounting section is used to mount a shaft mounting component, which is mounted on the mounting section by an interference fit. The shaft mounting component can be a bearing, a brake disc of a braking device, or a planetary carrier, etc. The hollow shaft 1 is mounted on other parts via the shaft mounting component. The hollow shaft 1 can also be other corresponding shaft system parts; the type of hollow shaft 1 is not specifically limited in this embodiment.

[0031] Furthermore, multiple reinforcing plugs 2 can be provided along the axial direction of the hollow shaft 1, and the insertion ports of the multiple reinforcing plugs 2 are oriented in the same direction; and / or, two adjacent reinforcing plugs 2 abut against each other along the axial direction of the hollow shaft 1.

[0032] In another example, the spindle includes a reinforcing plug 2, which can be configured to include an outer sleeve 21 and an inner plug 22. The outer sleeve 21 is inserted into the hollow shaft 1 via an interference fit. An insertion port is provided at one axially upward end of the outer sleeve 21, the shape of which matches the shape of the inner plug 22, and the size of which matches the size of the inner plug 22. A portion of the inner plug 22 is inserted into the outer sleeve 21 via an interference fit.

[0033] In this configuration, at least a portion of the outer sleeve 21 is opposite to the sleeve section on the hollow shaft 1 in the radial direction. For example, part of the outer sleeve 21 is opposite to the sleeve section, while another part is not; or, for another example, all parts of the outer sleeve 21 are opposite to the sleeve section. This application does not impose specific limitations on this configuration and allows for adjustments based on actual conditions. Furthermore, the end of the inner plug 22 near the insertion port is located inside the outer sleeve 21.

[0034] In another example, the outer sleeve 21 includes a plurality of outer sleeve pieces 211, which are joined together circumferentially along the hollow shaft 1. Similarly, the inner plug 22 includes a plurality of inner plug pieces 221, which are joined together circumferentially along the hollow shaft 1.

[0035] In the above embodiments, the hollow shaft 1 is provided, connecting the spindle to external parts such as bearings, brake discs of braking devices, and planetary carriers, and providing mounting points for the spindle and other parts. The reinforcing plug 2, with its inner plug 22 inserted into the outer sleeve 21 via an interference fit, and its outer sleeve 21 inserted into the hollow shaft 1 via an interference fit, increases the tension of both the outer sleeve 21 and the hollow shaft 1, further expanding the bearings on the outer side of the hollow shaft 1. Furthermore, the spindle in this invention uses a split structure for the reinforcing plug 2, comprising multiple outer sleeve parts 211 and multiple inner plug parts 221, increasing the spindle's rigidity while maintaining its strength, thereby extending the service life of the spindle and other components.

[0036] In some embodiments of this application, such as Figure 3 As shown, each outer sleeve 211 has a protruding abutment portion 2111 on its surface near the central axis of the hollow shaft 1, and the abutment portion 2111 abuts against the side of the inner plug 22 away from the insertion port.

[0037] In this embodiment of the application, each outer sleeve 211 may be provided with an abutment portion 2111. The abutment portion 2111 is provided at the end of the outer sleeve 211 away from the insertion port, and the abutment portion 2111 abuts against the side of the inner plug 22 away from the insertion port, thereby positioning and limiting the inner plug 22.

[0038] For example, the abutting portion 2111 can be formed by protruding from the outer side wall of the outer sleeve 211 away from the insertion port towards the central axis of the hollow shaft 1, and the abutting portion 2111 can be formed in a fan shape around the outer sleeve 211 in the circumferential direction, and the thickness direction of the fan shape can be the axial direction of the hollow shaft 1.

[0039] The abutment portions 2111 on multiple outer sleeve parts 211 can be arranged circumferentially along the central axis. The abutment portions 2111 of the multiple outer sleeve parts 211 are spliced ​​together along the circumferential direction of the hollow shaft 1. After splicing, a hole is formed on the side near the central axis of the hollow shaft 1. The axis of the hole coincides with or nearly coincides with the axis of the hollow shaft 1. This hole is used for connecting and inserting other parts.

[0040] In another example, the outer sleeve 211 and the abutment part 2111 can be integrally molded or connected by a detachable connection method such as threads. In this embodiment of the application, no specific limitation is made on the connection and molding method of the outer sleeve 211 and the abutment part 2111.

[0041] In the above embodiment, the outer sleeve 211 provides an installation point for the inner plug 22, facilitating its connection to the outer sleeve 21. The abutment portion 2111 provides positioning and limiting for the inner plug 22, ensuring its accurate insertion into the corresponding position within the outer sleeve 211. Furthermore, the presence of multiple outer sleeves 211 facilitates manufacturing and transportation, improving the flexibility of manufacturing and transportation processes.

[0042] In some embodiments of this application, such as Figure 4 As shown, each inner plug 221 has a protrusion 2211 on its end face away from the insertion port, wherein: the protrusions 2211 of the multiple inner plugs 221 are spliced ​​together with each other along the circumference of the hollow shaft 1; and / or, the abutment portions 2111 of the multiple outer plugs 211 are arranged around the protrusions 2211 of the multiple inner plugs 221 on one side away from the central axis of the hollow shaft 1.

[0043] For example, the boss 2211 extends axially away from the insertion port from the end of the inner plug 221. The boss 2211 is fan-shaped, and its outer wall abuts against the inner wall of the abutment portion 2111. The end of the boss 2211 away from the insertion port and the end of the abutment portion 2111 away from the insertion port are on the same plane. The boss 2211 and the inner plug 221 can be connected by a detachable connection method such as bolts, or they can be manufactured by integral molding.

[0044] In another example, multiple inner plug pieces 221 can be arranged circumferentially along the hollow shaft 1, and the multiple inner plug pieces 221 can be spliced ​​together to form a ring. The axial direction of the ring coincides with or nearly coincides with the axial direction of the hollow shaft 1. The outer wall of the inner plug piece 221 is provided with a connecting surface that matches the inner wall of the outer sleeve piece 211. For example, the connecting surface can be an arc surface. The inner plug piece 221 abuts against the outer sleeve piece 211, and the end face of the inner plug piece 221 away from the insertion port abuts against the end face of the abutting part 2111 near the insertion port.

[0045] Understandably, the surfaces of multiple inner plug pieces 221 near the central axis of the hollow shaft 1 are joined together circumferentially to form through holes, which can be circular or polygonal. Similarly, the surfaces of the bosses 2211 of the multiple inner plug pieces 221 near the central axis of the hollow shaft 1 can also be joined together circumferentially to form through holes, which can be circular or polygonal. Each boss 2211 corresponds to a plurality of abutting portions 2111. When the multiple bosses 2211 abut against the multiple abutting portions 2111, radially upward, the outer sidewalls of the multiple bosses 2211 abut against the inner sidewalls of the multiple abutting portions 2111, thereby allowing the multiple abutting portions 2111 to surround the side of the multiple bosses 2211 away from the central axis of the hollow shaft 1.

[0046] In the above embodiments, the boss 2211 serves as a guide and positioner for the inner plug component 221, ensuring coaxial installation of the inner plug component 221 and the outer casing component 211. It also facilitates quick insertion of the inner plug component 221 into the outer casing component 211, improving assembly efficiency. Furthermore, the presence of multiple inner plug components 221 facilitates manufacturing and transportation, enhancing the flexibility of manufacturing and transportation processes.

[0047] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, each abutment 2111 has a mounting hole 3 that runs through the circumference of the hollow shaft 1. A connector 4 that can move along the axial direction of the hollow shaft 1 is inserted into the mounting hole 3. The end of the connector 4 away from the insertion port is located on the side of the abutment 2111 away from the inner plug 221, and the end of the connector 4 near the insertion port is located on an inner plug 221.

[0048] For example, the abutment portion 2111 may be provided with a mounting hole 3, which extends through the abutment portion 2111 along the axial direction of the hollow shaft 1. A connector 4 is inserted into the mounting hole 3, the size of the connector 4 matching the size of the mounting hole 3, and the shape of the mounting hole 3 matching the shape of the connector 4. Under the action of force, the connector 4 can move within the mounting hole 3 along the axial direction of the hollow shaft 1.

[0049] In another example, the inner plug 221 may also have a mounting hole 3 at one end near the abutment portion 2111. The mounting hole 3 on the inner plug 221 does not penetrate the inner plug 221, and its axial direction coincides with or nearly coincides with the axial direction of the hollow shaft 1. The mounting hole 3 on the inner plug 221 has the same size and shape as the mounting hole 3 on the abutment portion 2111. Along the axial direction of the hollow shaft 1, the size of the mounting hole 3 on the inner plug 221 is set according to the actual situation. When the connecting member 4 passes through the mounting hole 3 on the abutment portion 2111, the end of the connecting member 4 near the insertion port can be inserted into the mounting hole 3 on the inner plug 221.

[0050] In another example, taking a bolt as the connecting member 4, the mounting holes 3 on the abutment portion 2111 and the inner plug 221 can both be threaded holes, matching the bolt so that the bolt can be screwed into the threaded hole. The connecting member 4 can also be other threaded components, and the mounting hole 3 can be a threaded hole matching the threaded component; alternatively, the connecting member 4 can be other types of insert components, and the mounting part is an insert hole corresponding to the insert component. In this embodiment, the type and structure of the connecting member 4 are not specifically limited, as long as they meet the actual needs.

[0051] It should be explained that the first tensioning surface can be understood as the outer wall of the outer sleeve component 211. The first tensioning surface and the bolt mounting surface need to maintain a certain taper angle to achieve the tensioning effect. In this embodiment, the specific angle of the taper angle is not limited, as long as the taper angle is an acute angle not equal to 90 degrees, generally less than 10 degrees. The second tensioning surface can be understood as the outer wall of the inner plug component 221. The taper of the second tensioning surface is consistent with that of the first tensioning surface. During operation, it cooperates with the first tensioning surface to provide tensioning force, thereby improving the rigidity of the spindle. It can be understood that the cooperation between the first tensioning surface and the second tensioning surface in this embodiment is achieved by wedge pre-tightening through wedge angle movement. Alternatively, other methods can be used to achieve the tensioning of the first tensioning surface and the second tensioning surface, which is not specifically limited in this embodiment.

[0052] Furthermore, the bolts should be positioned as close as possible to the working position of the tensioning surface. This application does not specify bolt specifications or quantity; different bolt specifications can be selected based on actual conditions to achieve different tensioning effects. For example, depending on the inner diameter of the bearing on the spindle assembly, the bolt specifications and quantity can be controlled to generate different tensioning forces. Similarly, with the same bolt specifications and quantity, different preloads can be generated to achieve different tensioning effects depending on the load or structure.

[0053] In the above embodiment, since the mounting hole 3 is provided, the inner plug 221 can be accurately positioned with the outer sleeve 211, thereby facilitating the insertion of the connector 4 into the corresponding mounting hole 3, and connecting the inner plug 22 with the outer sleeve 21; this can further improve the assembly speed.

[0054] In some embodiments of this application, such as Figure 1 As shown, each outer sleeve 211 is connected to N adjacent inner sleeves 221 via N connectors 4; and / or, each inner sleeve 221 is connected to M adjacent outer sleeves 211 via M connectors 4.

[0055] For example, the number of outer sleeve components 211 and inner plug components 221 can be multiple, for example, six, seven, or eight. Multiple outer sleeve components 211 and multiple inner plug components 221 are arranged sequentially along the circumferential direction. The number of outer sleeve components 211 and inner plug components 221 is equal, and the joints of the multiple outer sleeve components 211 and the multiple inner plug components 221 are staggered circumferentially along the hollow shaft 1. In this embodiment, the number of outer sleeve components 211 and inner plug components 221 is not specifically limited and can be set according to actual needs.

[0056] For example, one of the outer sleeve pieces 211 can correspond to two adjacent inner sleeve pieces 221 and be connected by two connectors 4; or, one of the inner sleeve pieces 221 can correspond to two adjacent outer sleeve pieces 211 and be connected by two connectors 4. That is, the inner wall of one outer sleeve piece 211 simultaneously abuts against a portion of the outer wall of two adjacent inner sleeve pieces 221; or, it can be understood that the outer wall of one inner sleeve piece 221 simultaneously abuts against a portion of the inner wall of two adjacent outer sleeve pieces 211.

[0057] In some embodiments of this application, such as Figure 5 As shown, an annular stop surface 5 facing the reinforcing plug 2 is provided on the inner circumferential side of the hollow shaft 1. The annular stop surface 5 abuts against the side of the multiple outer sleeve parts 211 near the insertion port. An annular groove 6 is provided at the outer edge of the annular stop surface 5.

[0058] For example, a first mounting cavity 11 is provided inside the hollow shaft 1; in addition, a second mounting cavity 12 is also provided inside the hollow shaft 1. The second mounting cavity 12 is connected to the first mounting cavity 11, and the axes of the second mounting cavity 12 and the first mounting cavity 11 coincide or nearly coincide. The radial dimension of the second mounting cavity 12 can be smaller than the radial dimension of the first mounting cavity 11, that is, a step is formed at the connection between the first mounting cavity 11 and the second mounting cavity 12, and the connection surface between the first mounting cavity 11 and the second mounting cavity 12 is the annular stop surface 5.

[0059] Furthermore, a concave shoulder structure can be provided at the edge of the annular stop surface 5. The concave shoulder structure can be an annular groove 6. The concave shoulder structure can be obtained by a portable machining method, such as milling.

[0060] In the above embodiments, the annular stop surface 5 serves as a guide and positioning surface, ensuring that the reinforcing plug 2 is accurately installed below the bearing and preventing it from sliding backward under extreme loads. The annular groove 6 prevents the shoulder from breaking due to stress concentration under load. Therefore, this location can be machined into a concave arc structure to reduce stress concentration. In this embodiment, the form of the arc structure is not specifically limited; any arc structure that reduces stress concentration is acceptable.

[0061] This application also provides a wind turbine generator set, which includes: the main shaft mentioned above and the shaft mounting components.

[0062] For example, taking a bearing as the mounting component on the shaft, the bearing is fitted onto the mounting section of the spindle, and the bearing and the mounting section are connected by an interference fit. This arrangement makes the fit between the bearing and the spindle tighter, reducing the probability of detachment.

[0063] In another example, at least a portion of the shaft mount is radially opposite the reinforcing plug 2 of the spindle. Taking a bearing as an example, the bearing may completely overlap with the reinforcing plug 2; or, the size of the bearing may be larger than the size of the reinforcing plug 2, and the reinforcing plug 2 may be covered by the bearing; or, the size of the reinforcing plug 2 may be larger than the size of the bearing, and the bearing may be covered by the reinforcing plug 2. In this embodiment, the dimensions of the reinforcing plug 2 and the shaft mount are not specifically limited, and can be set according to the actual situation.

[0064] The following describes the usage process of the main shaft and wind turbine generator set provided in this application: Step S100: In scenarios where the rigidity of the low-speed transmission system needs to be increased due to large loads or other reasons, and relative slippage deformation of the components needs to be avoided, the workers first use a portable machining method to machine the first mounting cavity 11 and the second mounting cavity 12 inside the hollow shaft 1, and machine the annular groove 6 at the connection between the first mounting cavity 11 and the second mounting cavity 12.

[0065] Step S200: Place the abutment 2111 and the boss 2211 in the appropriate position. The connector 4 passes through the mounting hole 3 on the abutment 2111 and continues to screw the connector 4 in, so that the connector 4 is screwed into the inner plug 22 through the mounting hole 3 on the inner plug 22 for initial pre-tightening. Then, each split component obtained by combining the abutment 2111, the outer sleeve 21, the boss 2211, and the inner plug 22 is installed into the first mounting cavity 11 and axially positioned by the annular stop surface 5 in the first mounting cavity 11.

[0066] Step S300: Continue tightening the connector 4. During the tightening process, the connector 4 drives the boss 2211 to move closer to the abutment part 2111 and the inner plug 22 to move closer to the outer sleeve 21, so that the tensioning surface on the inner plug 22 locks with the tensioning surface on the outer sleeve 21, continuously expanding the outer sleeve 21 and further expanding the hollow shaft 1. After completing the above steps, continue to insert the second split component into the first mounting cavity 11 until the last split component is installed. It should be explained that, since it is a split assembly, when installing the last split component, the tensioning effect of the other assembled split components needs to be considered. Based on the consideration of the tensioning effect, the last split component is subjected to secondary processing of the mold before completing the above assembly steps, thereby improving the overall rigidity of the spindle system.

[0067] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A spindle, characterized in that, include: Hollow shaft (1), the hollow shaft (1) includes a sleeve section, the sleeve section being used for interference fit with a shaft mounting part to fit the shaft mounting part outside the sleeve section; A reinforcing plug (2) includes an outer sleeve (21) and an inner plug (22). The outer sleeve (21) is fitted inside the hollow shaft (1). The outer sleeve (21) and the hollow shaft (1) are in an interference fit. At least a portion of the outer sleeve (21) is radially opposite to the fitted section of the hollow shaft (1). The outer sleeve (21) has an insertion port for the inner plug (22) to be inserted at one end of the hollow shaft (1) in the axial direction. At least a portion of the inner plug (22) is inserted into the outer sleeve (21). The inner plug (22) and the outer sleeve (21) are in an interference fit. The outer sleeve (21) is formed by splicing multiple outer sleeve pieces (211) along the circumference of the hollow shaft (1); and / or the inner plug (22) is formed by splicing multiple inner plug pieces (221) along the circumference of the hollow shaft (1).

2. The spindle according to claim 1, characterized in that, Each of the outer sleeves (211) has a protruding abutment (2111) on its surface near the central axis of the hollow shaft (1), the abutment (2111) abutting against the side of the inner plug (22) away from the insertion port.

3. The spindle according to claim 2, characterized in that, The abutting portion (2111) is arranged in a fan shape extending circumferentially along the outer sleeve (211); and / or, The abutting portions (2111) of the plurality of said outer garment parts (211) are spliced ​​together with each other along the circumference of the hollow shaft (1).

4. The spindle according to claim 2, characterized in that, Each of the inner plug components (221) has a protruding boss (2211) on its end face away from the insertion port, wherein: The bosses (2211) of the plurality of inner plug components (221) are joined together circumferentially along the hollow shaft (1); and / or, The abutting portions (2111) of the plurality of outer sleeve pieces (211) are arranged around the bosses (2211) of the plurality of inner plug pieces (221) on the side away from the central axis of the hollow shaft (1).

5. The spindle according to claim 2, characterized in that, Each of the abutment portions (2111) is provided with a mounting hole (3) extending circumferentially along the hollow shaft (1). A connector (4) capable of moving axially along the hollow shaft (1) is inserted into the mounting hole (3). The end of the connector (4) away from the insertion port is located on the side of the abutment portion (2111) away from the inner plug (221). The end of the connector (4) near the insertion port is disposed on one of the inner plugs (221).

6. The spindle according to claim 5, characterized in that, The connector (4) is a screw-in connector, and the inner plug (221) has a threaded hole on its end face away from the insertion port that is threaded to the screw-in connector.

7. The spindle according to claim 5, characterized in that, Each of the outer sleeve sub-pieces (211) is connected to the adjacent N inner sleeve sub-pieces (221) via N connectors (4); and / or, Each of the inner plug sub-pieces (221) is connected to the adjacent M outer plug sub-pieces (211) via the M connectors (4).

8. The spindle according to claim 1, characterized in that, The number of the outer sleeve (211) is equal to the number of the inner plug (221); and / or, The joints of the multiple outer sleeve pieces (211) and the joints of the multiple inner plug pieces (221) are staggered in the circumferential direction of the hollow shaft (1).

9. The spindle according to claim 1, characterized in that, The hollow shaft (1) has an annular stop surface (5) facing the reinforcing plug (2) on its inner peripheral side surface. The annular stop surface (5) abuts against the side of the multiple outer sleeve parts (211) near the insertion port. An annular groove (6) is provided at the edge of the annular stop surface (5).

10. A wind turbine generator set, characterized in that, include: Spindle, wherein the spindle is the spindle as described in any one of claims 1-9; A shaft mounting component is fitted onto the outer part of the main shaft's mounting section, and the shaft mounting component and the mounting section are interference-fitted. At least a portion of the shaft mounting component is radially opposite to the reinforcing plug (2) of the main shaft.

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