A kind of on-tower installable wind turbine thrust washer prolongs life device

Abstract

The application relates to a tower-mounted wind turbine conical-roller-bearing life-extending device, belonging to the field of wind power bearings, which comprises an extended bearing seat, a front end of which is fixedly connected with a main shaft bearing seat on a main shaft, and a rear end of which is fixedly connected with an outer ring pressing cover; a main shaft sleeve, which is sleeved on the main shaft and rotates with the main shaft; a thrust conical-roller-bearing, which is installed in an installation cavity surrounded by the main shaft sleeve, the extended bearing seat and the outer ring pressing cover; the thrust conical-roller-bearing and the conical-roller-bearing on the main shaft are concentrically arranged; the extended bearing seat, the main shaft sleeve, the thrust bearing outer ring, the thrust bearing inner ring, the cage and the outer ring pressing cover of the thrust conical-roller-bearing are all of a radial split type ring structure, which is split into two halves or more parts in the radial direction and assembled and fastened into a ring structure. The application can be directly disassembled and assembled in the machine cabin at the top of the fan tower drum, effectively shares or transfers the concentrated axial load acting on the original conical-roller-bearing lower wind direction side, and prolongs the service life of the conical-roller-bearing.

Description

Technical Field

[0001] This invention belongs to the technical field of wind power generation equipment, specifically relating to a life extension device for self-aligning roller bearings of wind turbines that can be installed on towers. Background Technology

[0002] The main shaft bearing of a wind turbine is a core component of its drivetrain, bearing enormous and complex loads from the wind turbine over long periods, including radial loads, axial loads, and overturning moments. Currently, self-aligning roller bearings are widely used in the main shaft supports of megawatt-class wind turbines. Their advantages lie in their excellent self-aligning performance and high radial load capacity, which can compensate for misalignment caused by tower deflection and installation errors.

[0003] However, in actual operation, especially in large wind turbine units, the failure problem of self-aligning roller bearings on the main shaft is quite prominent. Studies have found that their failure often exhibits obvious directional characteristics: the bearing raceways and rolling elements located on the leeward side are more prone to early fatigue damage, such as pitting and spalling. The reason for this is that the huge thrust (axial load) generated by the wind turbine is not evenly borne by the axial bearing surface of the bearing. Under complex operating conditions, especially under the influence of dynamic wind loads, start-up and shutdown impacts, and gravity, the leeward side raceway will bear a disproportionately concentrated axial force, resulting in a significantly higher stress cycle number in this area than in other parts, thus accelerating contact fatigue and ultimately causing premature bearing failure.

[0004] Once the main shaft bearing fails, the traditional repair solution is to "replace it off the tower". This process requires the use of large hoisting equipment (such as cranes of 1,000 tons or more) to lift the wind turbine and nacelle to the ground as a whole. This not only incurs high hoisting costs, but also requires paying high procurement costs for the bearing itself and long downtime losses. The overall economic cost is huge, which seriously affects the operating efficiency of the wind farm.

[0005] To address this issue, the industry has attempted to select larger bearings or adopt different bearing arrangements during the initial design phase, but this increases initial manufacturing costs and structural complexity. Other solutions propose localized repairs or the addition of auxiliary supports to the bearing on the tower after damage, but existing auxiliary devices are often structurally complex and cannot be installed without disassembling large components such as the main shaft or gearbox, thus lacking practicality.

[0006] Therefore, there is an urgent need for an innovative solution that can be implemented directly inside the nacelle at the top of the wind turbine tower without lowering the tower for installation. This would effectively distribute or transfer the concentrated axial load acting on the downwind side of the original self-aligning roller bearing, thereby significantly extending its service life and avoiding the expensive lifting and replacement process. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a wind turbine self-aligning roller bearing life extension device that can be installed on a tower. This device adopts a split structure, which facilitates convenient installation around the main shaft within the limited space of the nacelle on the tower. After installation, it can transfer part of the axial load that was originally borne solely by the downwind raceway of the original self-aligning roller bearing to this life extension device, fundamentally improving the stress state of the original bearing and achieving the purpose of life extension.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a wind turbine self-aligning roller bearing life extension device that can be installed on a wind turbine main shaft, and located on the leeward side of the self-aligning roller bearing on the main shaft, comprising: An extension bearing housing, the front end of which is fixedly connected to the main shaft bearing housing on the main shaft, and the rear end of which is fixedly connected to the outer ring cover; A spindle bushing is used to be fitted onto the spindle and rotate with the spindle; A thrust self-aligning roller bearing is installed in a mounting cavity formed by the main shaft sleeve, the extended bearing housing, and the outer ring cover. The outer ring cover presses against the outer ring of the thrust self-aligning roller bearing, and the shoulder at the front end of the main shaft sleeve presses against the inner ring of the thrust self-aligning roller bearing. The thrust self-aligning roller bearing and the self-aligning roller bearing are concentrically arranged. The extended bearing housing, main shaft sleeve, thrust bearing outer ring, thrust bearing inner ring, thrust self-aligning roller bearing cage and outer ring cover all adopt a radially split ring structure, which is divided into two or more parts in the radial direction and assembled and fastened into a ring structure by bolts.

[0009] Furthermore, the outer ring raceway of the self-aligning roller bearing and the outer ring raceway of the thrust self-aligning roller bearing have the same center in the axial direction.

[0010] Furthermore, the inner diameter surface of the main shaft sleeve is provided with a tapered surface for transitional fit with the outer diameter surface of the main shaft; the outer diameter surface of the main shaft sleeve is provided with an L-shaped shoulder for contacting the front end face of the inner ring of the thrust bearing.

[0011] Furthermore, a locking ring is also fitted on the main shaft, and the front end of the main shaft sleeve is fastened to the locking ring by bolts.

[0012] Furthermore, the front end and rear end of the mounting cavity are respectively provided with a front sealing structure and a rear sealing structure. The front sealing structure includes a front sealing ring and a front sealing gland disposed between the extension bearing housing and the main shaft sleeve. The rear sealing structure includes a rear sealing ring and a rear sealing gland disposed between the outer ring gland and the main shaft sleeve.

[0013] Furthermore, the extended bearing housing, main shaft sleeve, thrust bearing outer ring, thrust bearing inner ring, thrust self-aligning roller bearing cage and outer ring cap are all radially divided into two semicircular rings, and each semicircular ring end face is provided with connecting bolt holes.

[0014] Furthermore, the extended bearing housing is divided into two semicircular rings, with the upper half being the upper region and the lower half being the lower region. The upper half is provided with a grease injection hole, and the lower half is provided with a grease outlet hole.

[0015] Furthermore, the mating end face formed by the radial splitting of the inner ring of the thrust bearing is a complementary V-shaped surface; the mating end face formed by the radial splitting of the outer ring of the thrust bearing is a complementary V-shaped surface.

[0016] Furthermore, the extended bearing housing, main shaft sleeve, outer ring cap, thrust bearing inner ring, and thrust bearing outer ring are all provided with end face sealing structures on the radially split structural end faces. The end face sealing structure includes a sealing groove and a sealing strip fixed in the sealing groove.

[0017] Furthermore, a plurality of sensor groups are provided between the outer ring cover and the outer ring of the thrust bearing, arranged at uniform intervals along the circumference. The sensor group includes strain gauges and adhesive temperature sensors attached to the rear end face of the outer ring of the thrust bearing. The inner side of the outer ring cover is provided with a relief groove corresponding to the sensor group. The relief groove is provided with a wire hole to facilitate the wire harness of the sensor group to pass through for connection to external equipment.

[0018] The beneficial effects of this invention are: the wind turbine self-aligning roller bearing life extension device proposed in this invention can be implemented directly inside the nacelle at the top of the wind turbine tower without the need for tower hoisting operations, effectively sharing or transferring the concentrated axial load acting on the downwind side of the original self-aligning roller bearing, thereby significantly extending its service life and avoiding the expensive hoisting and replacement process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the life extension device for self-aligning roller bearings of wind turbines according to the present invention; Figure 2 This is a schematic diagram of the extended bearing housing in the wind turbine self-aligning roller bearing life extension device of the present invention; Figure 3 This is a schematic diagram of the main shaft sleeve structure in the wind turbine self-aligning roller bearing life extension device of the present invention; Figure 4 This is a schematic diagram showing the distribution of bolt through holes on the main shaft sleeve in the wind turbine self-aligning roller bearing life extension device of the present invention; Figure 5 This is a schematic diagram of the thrust self-aligning roller bearing in the wind turbine generator self-aligning roller bearing life extension device of the present invention; Figure 6 This is a schematic diagram of the outer ring structure of the thrust self-aligning roller bearing in the wind turbine generator self-aligning roller bearing life extension device of the present invention; Figure 7 This is a schematic diagram of the inner ring structure of the thrust self-aligning roller bearing in the wind turbine generator self-aligning roller bearing life extension device of the present invention. Figure 8 This is a schematic diagram of the sensor arrangement at the rear end of the wind turbine self-aligning roller bearing life extension device described in this invention. Figure 9 This is a schematic diagram of the outer ring cover of the wind turbine self-aligning roller bearing life extension device described in this invention; Figure 10 This is a schematic diagram of the overall assembly of the wind turbine self-aligning roller bearing life extension device described in this invention. Figure 11 This is an axial cross-sectional view of the overall assembly of the wind turbine self-aligning roller bearing life extension device described in this invention. Figure 12 This is a schematic diagram showing the thrust self-aligning roller bearing and the wind turbine self-aligning roller bearing arranged concentrically after the wind turbine self-aligning roller bearing life extension device of the present invention is assembled. Figure 13 for Figure 12 A partial view; Figure 14 Before installing the life extension device of this invention, the rolling element load distribution diagram of the self-aligning roller bearing of the wind turbine in the prior art is shown. Figure 15 The diagram shows the load distribution of the rolling elements of the self-aligning roller bearing in a wind turbine after the installation of the life-extending device of this invention. The markings in the diagram are: 1. Extended bearing housing, 2. Main shaft sleeve, 3. Thrust self-aligning roller bearing, 301. Thrust bearing inner ring, 302. Thrust bearing roller, 303. Thrust bearing outer ring, 304. Thrust bearing cage, 4. Outer ring gland, 5. Front sealing gland, 6. Front sealing ring, 7. Rear sealing ring, 8. Rear sealing gland, 9. Lifting hole, 10. Grease injection hole, 11. Connecting bolt hole, 12. Bolt through hole, 13. V-shaped surface, 14. Outer diameter surface of the large flange, 15. Outer diameter surface of the small flange, 16. Grease outlet hole, 17. Strain gauge, 18. Temperature sensor, 19. Clearance groove, 20. Wire hole; 100. Frame; 200. Spindle; 300. Life extension device; 400. Spindle bearing housing; 500. Hub; 600. Self-aligning roller bearing; 700. Shaft sealing cover; 800. Locking ring. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the embodiments, but this should not be construed as limiting the invention in any way.

[0021] The wind turbine self-aligning roller bearing life extension device proposed in this invention addresses the damage problem of the self-aligning roller bearing on the leeward side of the wind turbine main shaft. It involves directly adding an auxiliary bearing device capable of withstanding the main axial thrust to that side. To facilitate convenient installation within the space-constrained nacelle and around the existing main shaft, the device must adopt a split structure. That is, its main components, such as the bearing housing and bushing, can be radially divided into two or more halves, and assembled and secured on-site using high-strength bolts, thus completely eliminating the need to disassemble the main shaft system.

[0022] Based on the above-mentioned inventive concept, the wind turbine self-aligning roller bearing life extension device in this embodiment adopts a two-half split structure. Figure 1 The structure of one semi-circular ring and two other rings after the device is dissected are shown. Figure 1 The semi-circular ring structure shown is fixed by connecting the end faces to obtain a circular life extension device.

[0023] like Figure 1 As shown, the life extension device in this embodiment includes an extension bearing housing 1, a main shaft sleeve 2, a thrust self-aligning roller bearing 3, an outer ring cover 4, a front sealing cover 5, a front sealing ring 6, a rear sealing ring 7, and a rear sealing cover 8.

[0024] The following is combined with Figure 1-9 The structure of each part of the life extension device is described in detail.

[0025] The front end of the extended bearing housing 1 is fixedly connected to the main shaft bearing housing 400 of the wind turbine, and the rear end is connected to the outer ring cover 4. The extended bearing housing 1 is composed of two symmetrical semi-circular bearing housing units. Each semi-circular bearing housing unit has a lifting hole 9 and a connecting bolt hole 11 on its outer diameter surface. One of the two semi-circular bearing housing units is the upper half of the extended bearing housing 1, and the other is the lower half. The lifting hole 9 is located at the center of the two bearing housing units for easy lifting and installation. The connecting bolt hole 11 is located at the mating end of the bearing housing units so that the two bearing housing units can be fixedly connected together with bolts to form an annular extended bearing housing 1. The outer diameter surface of the bearing housing unit that is the upper half is also provided with grease injection holes 10, which are symmetrically distributed on both sides of the lifting hole 9, with two grease injection holes 10 on each side, so that the lubricating grease can flow to the bearing housing unit in the lower half after being injected. The outer diameter surface of the bearing housing unit that is the lower half is also provided with grease outlet holes 16 for discharging lubricating grease to facilitate the replacement of new lubricating grease.

[0026] The main shaft sleeve 2 is fitted onto the main shaft 200 of the wind turbine, and the inner diameter surface of the main shaft sleeve 2 is tapered for transition fit with the outer diameter surface of the main shaft 200. The main shaft sleeve 2 is also composed of two semi-circular rings joined together, each semi-circular ring being a sleeve unit. Each sleeve unit has connecting bolt holes 11 on its outer diameter surface, located at both ends of the sleeve unit. In this embodiment, the outer diameter surface of the main shaft sleeve 2 has an L-shaped shoulder, thus dividing the outer diameter surface into two segments of unequal diameter. Each segment has the aforementioned connecting bolt holes 11. During installation, to axially fix the main shaft sleeve 2, the life-extending device of this invention also has multiple non-uniformly distributed bolt through holes 12 on the front end face (i.e., the large-diameter end face) of the main shaft sleeve 2, such as... Figure 4 As shown, the position of the bolt through hole 12 needs to correspond one-to-one with the locking ring bolt hole on the spindle 200.

[0027] The thrust self-aligning roller bearing 3 is installed between the extended bearing housing 1 and the main shaft sleeve 2. The thrust bearing inner ring 301, thrust bearing outer ring 303, and thrust bearing cage 304 of the thrust self-aligning roller bearing 3 all adopt a two-half structure, i.e., composed of two semi-circular ring structures joined together. Furthermore, the mating end faces of the two semi-circular ring structures of the thrust bearing inner ring 301 are complementary V-shaped surfaces 13, i.e., one end of the mating end face is a concave V-shaped surface 13, and the other end is a convex V-shaped surface 13. The mating end faces of the two semi-circular ring structures of the thrust bearing outer ring 303 also adopt the same V-shaped surface 13. By setting the V-shaped surface 13 on the mating end face, it can prevent the rolling element from simultaneously rolling against the entire split mating surface (i.e., the mating end face) when passing over it, and also provides a certain degree of shear resistance.

[0028] The outer diameter surface of the outer ring 303 of the thrust bearing is provided with connecting bolt holes 11, and the connecting bolt holes 11 are located at both ends of each semi-circular ring structure.

[0029] The inner ring 301 of the thrust bearing has a large inner ring flange and a small inner ring flange. The outer diameter surface 14 of the large inner ring flange and the outer diameter surface 15 of the small inner ring flange are both provided with connecting bolt holes, and the connecting bolt holes 11 are located at both ends of each semi-circular ring structure.

[0030] A front sealing structure is also provided between the extended bearing housing 1 and the front end of the main shaft sleeve 2, including a front sealing ring 6 and a front sealing cover 5 for fixing the front sealing ring 6. A rear sealing structure is also provided between the outer ring cover 4 and the rear end of the main shaft sleeve 2, including a rear sealing ring 7 and a rear sealing cover 8 for fixing the rear sealing ring 7.

[0031] In the life extension device of this invention, the main structure, except for the rolling element, adopts a radially split two-half structure, dividing the complete circular ring into two semi-circular rings, which are then connected as a whole by high-strength bolts. This structure allows for the installation, maintenance, or replacement of the life extension device without removing the main shaft system from the tower.

[0032] As a further preferred embodiment, the end faces of the semi-circular ring structures of the extended bearing housing 1, main shaft sleeve 2, outer ring cap 4, thrust bearing inner ring 301, and thrust bearing outer ring 303 are all provided with end face sealing structures, including sealing grooves and sealing strips fixed in the sealing grooves. After the end faces of the two semi-circular ring structures are connected and fixed, the end face seal is formed by squeezing the sealing strips to avoid grease leakage of the thrust self-aligning roller bearing 3 and to avoid external contamination of the thrust self-aligning roller bearing 3.

[0033] In the above embodiments, the components requiring splitting in the life extension device are all split in half, i.e., divided into two semi-circular rings. In other embodiments, these components can also be divided into two or more arc-shaped rings, such as three arc-shaped rings with a central angle of 120°, or four arc-shaped rings with a central angle of 90°. Furthermore, the central angles of the multiple arc-shaped rings do not necessarily have to be equal. These variations in the radial splitting structure, using the same connection method and structural arrangement, can achieve the same technical effect.

[0034] In the thrust self-aligning roller bearing 3, the front end face of the inner ring 301 of the thrust bearing contacts and is positioned with the L-shaped shoulder on the outer diameter surface of the main shaft sleeve 2, and the rear end face of the outer ring 303 of the thrust bearing contacts and is positioned with the outer ring cover 4. The outer ring cover 4 is fixedly connected to the extension bearing seat 1.

[0035] Furthermore, the life-extending device described in this invention is also equipped with a force sensor and a temperature sensor to monitor the load and temperature changes borne by the thrust self-aligning roller bearing 3 in real time. In this embodiment, the force sensor is a strain gauge, and the temperature sensor is a patch-type temperature sensor, both of which can be attached to the thrust self-aligning roller bearing 3. Specifically, as shown... Figure 8 , 9As shown, a strain gauge 17 and a patch temperature sensor 18 constitute a sensor group. Multiple such sensor groups are evenly spaced along the circumferential direction and pasted on the rear end face of the thrust bearing outer ring 303. In this embodiment, a total of 6 sensor groups are provided. Correspondingly, a clearance groove 19 is provided on the inner side of the outer ring cover 4. The number of clearance grooves 19 is consistent with the number of sensor groups, and the position of the clearance grooves 19 corresponds to the position of the sensor groups. The length, width, and depth dimensions of the clearance grooves 19 are designed to ensure that after the outer ring cover 4 is installed, the sensor groups can be positioned one-to-one in the clearance grooves 19 without being squeezed by the outer ring cover 4. Furthermore, a wiring hole is provided in the clearance groove. The wiring harness of the sensor group passes through the wiring hole and connects to an external device to transmit the real-time monitoring results to a terminal for storage, query, and monitoring. In this embodiment, the external device is an edge acquisition gateway. The strain gauge 17 and the patch temperature sensor 18 read out the raw signals through the edge acquisition gateway and wirelessly transmit them to the data query terminal. The axial load borne by the thrust self-aligning roller bearing 3 can be obtained through the wireless data query terminal. The edge acquisition gateway can be powered by 24V from inside the wind turbine nacelle.

[0036] The following is in conjunction with the appendix Figure 10-13 The assembly of the life extension device described in this invention on the spindle will be explained.

[0037] Figure 10 In the design, the frame 100, main shaft 200, main shaft bearing housing 400, and hub 500 are all original components of the fan. The life extension device 300 is an added later component. The life extension device 300 is fixedly installed using the original bolt holes of the fan shaft system, without the need to drill new bolt holes.

[0038] The front end face of the extended bearing housing 1 is connected to the original shaft sealing cap 700 and the main shaft bearing housing 400 by high-strength bolts. The inner diameter surface of the main shaft sleeve 2 and the outer diameter surface of the main shaft 200 are both tapered surfaces, and they are fitted together to achieve radial positioning of the main shaft sleeve 2. The front end of the main shaft sleeve 2 is connected to the locking ring 800 fitted on the main shaft 200 by high-strength bolts to achieve axial positioning of the main shaft sleeve 2. The inner diameter surface of the front end of the extended bearing housing and the outer diameter surface of the main shaft sleeve are sealed by a front sealing cap 5 and a front sealing ring 6. The rear end face of the extended bearing housing 1 is connected to the outer ring cap 4 by high-strength bolts, and the inner diameter surface of the outer ring cap 4 and the outer diameter surface of the main shaft sleeve 2 are sealed by a rear sealing ring 7 and a rear sealing cap 8.

[0039] The extended bearing housing 1, main shaft sleeve 2, outer ring cap 4, and front and rear sealing structures form a mounting cavity for installing the thrust self-aligning roller bearing 3. The front end face of the inner ring 301 of the thrust self-aligning roller bearing 3 engages with the L-shaped shoulder on the outer diameter surface of the main shaft sleeve, achieving axial positioning of the inner ring 301. The inner diameter surface of the inner ring 301 transitions with the outer diameter surface of the main shaft sleeve 2, achieving radial positioning of the inner ring 301. The end face of the outer ring 303 of the thrust bearing engages with the outer ring cap 4, achieving axial positioning of the outer ring 303. The outer diameter surface of the outer ring 303 transitions with the inner diameter surface of the extended bearing housing 1, achieving radial positioning of the outer ring 303. The outer ring cap 4 is fixed to the extended bearing housing 1 by high-strength bolts, achieving axial positioning of the entire life extension device.

[0040] Preferred, such as Figure 12 , 13 As shown, the thrust self-aligning roller bearing 3 of the life extension device 300 and the self-aligning roller bearing 600 on the wind turbine are concentrically arranged. Specifically, the self-aligning roller bearing 600 has double-row rolling elements 600-1, with the leeward row of rolling elements closer to the life extension device 300. Let the axial cross-sectional radius of the outer raceway of the double-row rolling elements 600-1 be R1, and let the axial cross-sectional radius of the outer raceway of the thrust bearing roller 302 of the thrust self-aligning roller bearing 3 be R2. The concentric arrangement means that R1 and R2 correspond to the same center O. If the thrust self-aligning roller bearing 3 and the self-aligning roller bearing 600 are not concentric, the self-aligning roller bearing 600 will be forced to bear the majority of the radial load, while the thrust self-aligning roller bearing 3 will be in a "loose" state or only subjected to a slight load. This not only causes premature failure of the self-aligning roller bearing 600 but also causes wear and temperature rise in the thrust self-aligning roller bearing 3 due to rolling element slippage. Therefore, adopting a concentric arrangement can extend the service life of the thrust self-aligning roller bearing 3 and the self-aligning roller bearing 600, and avoid edge stress concentration in the thrust self-aligning roller bearing 3.

[0041] Figure 14 , 15 The image shows the rolling element load distribution of the self-aligning roller bearing of a wind turbine before and after the installation of the life-extending device of this invention. Figure 14 , 15 It can be seen that the load distribution of the windward rolling elements of the self-aligning roller bearing 600 after the life extension device 300 is added is significantly less than before the life extension device 300 is added. Specifically, the maximum force on the windward rolling elements of the self-aligning roller bearing 600 before the addition of the device is 691.27KN, ​​which is reduced to 351.36KN after the addition, a reduction of nearly 50%, which is very significant.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the specific implementation of the present invention with reference to the above embodiments. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the protection scope of the pending claims.

Claims

1. A tower-mountable prolonging device for a self-aligning roller bearing of a wind turbine, for mounting on a main shaft of a wind turbine and located on a downwind side of a self-aligning roller bearing on the main shaft, characterized in that, include: An extension bearing housing, the front end of which is fixedly connected to the main shaft bearing housing on the main shaft, and the rear end of which is fixedly connected to the outer ring cover; A spindle sleeve is used to be fitted onto the spindle and rotate with the spindle; the inner diameter surface of the spindle sleeve is provided with a tapered surface for transition fit with the outer diameter surface of the spindle; the outer diameter surface of the spindle sleeve is provided with an L-shaped shoulder for contacting the front end face of the inner ring of the thrust bearing. A thrust self-aligning roller bearing is installed in a mounting cavity formed by the main shaft sleeve, the extended bearing housing, and the outer ring cap. The outer ring cap presses against the outer ring of the thrust self-aligning roller bearing, and the shoulder at the front end of the main shaft sleeve presses against the inner ring of the thrust self-aligning roller bearing. The thrust self-aligning roller bearing and the self-aligning roller bearing are concentrically arranged, and the outer ring raceway of the self-aligning roller bearing and the outer ring raceway of the thrust self-aligning roller bearing have the same center in the axial direction. The axial cross-sectional radius of the outer ring raceway of the self-aligning roller bearing is R1, and the axial cross-sectional radius of the outer ring raceway of the thrust self-aligning roller bearing is R2, where R2 > R1. The extended bearing housing, main shaft sleeve, thrust bearing outer ring, thrust bearing inner ring, thrust self-aligning roller bearing cage and outer ring cover all adopt a radially split ring structure, which is divided into two or more parts in the radial direction and assembled and fastened into a ring structure by bolts.

2. The wind turbine self-aligning roller bearing life extension device according to claim 1, characterized in that, A locking ring is also fitted on the main shaft, and the front end of the main shaft sleeve is fastened to the locking ring by bolts.

3. The wind turbine self-aligning roller bearing life extension device according to claim 1, characterized in that, The front and rear ends of the mounting cavity are respectively provided with a front sealing structure and a rear sealing structure. The front sealing structure includes a front sealing ring and a front sealing gland disposed between the extension bearing housing and the main shaft sleeve. The rear sealing structure includes a rear sealing ring and a rear sealing gland disposed between the outer ring gland and the main shaft sleeve.

4. The wind turbine self-aligning roller bearing life extension device according to claim 1, characterized in that, The extended bearing housing, main shaft sleeve, thrust bearing outer ring, thrust bearing inner ring, thrust self-aligning roller bearing cage and outer ring cover are all radially divided into two semicircular rings, and each semicircular ring end face is provided with connecting bolt holes.

5. The wind turbine self-aligning roller bearing life extension device according to claim 4, characterized in that, The extended bearing housing is divided into two semicircular rings, with the upper half being the upper region and the lower half being the lower region. The upper half is provided with a grease injection hole, and the lower half is provided with a grease outlet hole.

6. The wind turbine self-aligning roller bearing life extension device according to claim 1, characterized in that, The mating end face formed by the radial splitting of the inner ring of the thrust bearing is a complementary V-shaped surface; the mating end face formed by the radial splitting of the outer ring of the thrust bearing is a complementary V-shaped surface.

7. The wind turbine self-aligning roller bearing life extension device according to claim 1, characterized in that, The extended bearing housing, main shaft sleeve, outer ring cover, thrust bearing inner ring, and thrust bearing outer ring are all provided with end face sealing structures on the radially split structural end faces.

8. The wind turbine self-aligning roller bearing life extension device according to claim 1, characterized in that, Between the outer ring cover and the outer ring of the thrust bearing, there are also multiple sensor groups arranged at uniform intervals along the circumference. The sensor group includes strain gauges and adhesive temperature sensors attached to the rear end face of the outer ring of the thrust bearing. The inner side of the outer ring cover is provided with a relief groove corresponding to the sensor group. The relief groove is provided with a wire hole to facilitate the wire harness of the sensor group to pass through for connection to external equipment.

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