A device and method for facilitating replacement of wind turbine main shaft plain bearing bushings

Abstract

The application discloses a device and method for conveniently replacing a sliding bearing bushing of a main shaft of a wind driven generator, which comprises a sliding bearing module, a main shaft supporting module, a circumferential rotation limiting module, a circumferential rotation driving module and a collection and control module, the sliding bearing module is composed of a bushing, a bushing seat, an upper bearing seat and a lower bearing seat; the main shaft supporting module is used for jacking up the main shaft when replacing the bushing at a lower bearing position; the circumferential rotation limiting module is used for limiting the circumferential rotation of the bushing seat when the wind driven generator is running; the circumferential rotation driving module is used for driving the bushing seat to rotate when replacing the bushing at the lower bearing position, so that the bushings which are not worn to a wear threshold are rotated to the lower bearing position; the collection and control module is used for acquiring a bushing wear signal and controlling the coordinated action of the modules; the application can automatically replace the bushing at the lower bearing position which reaches the wear threshold, reduces the number of high-altitude operations of maintenance personnel and effectively saves a large amount of manpower and material resources.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology, specifically relating to a device and method for facilitating the replacement of the sliding bearing bush of the main shaft of a wind turbine. Background Technology

[0002] With the development of high-power wind power generation technology and the increasing demand for high-load, high-reliability, and long-life support bearings, sliding bearings have become a hot research topic globally for the replacement of rolling bearings with sliding bearings for the main shaft support bearings of high-power wind turbines. However, the low-speed, heavy-load (linear velocity less than 0.2 m / s, average specific pressure greater than 10 MPa) and frequent start-stop (2000 times / year) operating conditions of wind turbine sliding bearings cause the bearing bushes at the lower load-bearing position to operate under harsh conditions of edge loading and insufficient lubrication. This makes the bearing bushes at the lower load-bearing position extremely prone to wear and failure, requiring continuous replacement. Conventional replacement methods for the lower load-bearing bearing bushes require temporary support of the main shaft using a suspension device to separate the main shaft from the lower load-bearing bearing bushes, followed by professional maintenance personnel climbing the tower to replace them. Since wind turbine sliding bearings are often installed high in mountainous or ocean areas, conventional replacement methods for the lower load-bearing bearing bushes have drawbacks such as high operational difficulty, significant safety hazards, and high manpower and material costs. Therefore, a new technical solution is urgently needed to address the challenge of replacing the lower load-bearing bearing bushes. Summary of the Invention

[0003] The purpose of this invention is to provide a device and method for easily replacing the sliding bearing bushes of a wind turbine main shaft. This invention only requires temporarily lifting the main shaft using the main shaft support devices at both ends of the sliding bearing seat during wind turbine shutdown. Then, the limiting block in the circumferential rotation limiting module is controlled to disengage from the limiting groove, and the bearing bush seat is controlled to rotate a certain angle. This causes other bearing bushes on the circumferential direction of the sliding bearing that have not been worn to a set wear threshold to rotate to the position of the currently worn and failed lower bearing bush, becoming the new lower bearing bush. Finally, the rotation limiting block is installed, and the main shaft support device is lowered, achieving automatic online replacement of the worn and failed bearing bushes at the lower bearing position. When the newly replaced bearing bush reaches the wear threshold, the above steps are repeated until all bearing bushes on the circumferential direction of the sliding bearing are worn and failed. Only then is it necessary for professional personnel to go up the tower for replacement, which can significantly reduce the number of times personnel need to go up the tower and reduce a large amount of manpower and material costs. Automatic bearing bush replacement at high altitudes is more efficient and can effectively solve the problem of inconvenient replacement of existing bearings when damaged.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A device for facilitating the replacement of sliding bearing bushes on the main shaft of a wind turbine includes a sliding bearing module, a main shaft support module, a circumferential rotation limiting module, a circumferential rotation drive module, and a data acquisition and control module. The sliding bearing module comprises eight bushes, bush seats, an upper bearing seat, and a lower bearing seat of identical dimensions and material characteristics, used to support the main shaft during wind turbine operation. The main shaft support module is used to lift the main shaft when the wind turbine is stopped for bush replacement, separating the main shaft from the bushes to provide space for bush replacement. The circumferential rotation limiting module restricts the circumferential rotation of the bush seats during wind turbine operation. The circumferential rotation drive module drives the circumferential rotation of the bush seats when the wind turbine is stopped for bush replacement. The data acquisition and control module acquires wear signals of the bushes and, when replacing the bushes, controls the main shaft support module to lift the main shaft, controls the circumferential rotation limiting module to release the limiting of the bush seats, and controls the circumferential rotation drive module to drive the bush seats to rotate to a designated position to complete the bush replacement operation.

[0006] As a further preferred embodiment, the central angle of each bearing bush is 40°, and one side of each bearing bush is provided with three rectangular mounting slots of the same size and circumferentially spaced at 15° intervals for mounting bearing bush thickness detection sensors; countersunk threaded holes are provided at the positions of the outer arc surface of the bearing bush and the center of each rectangular mounting slot; and a threaded hole for connecting to the bearing bush seat is also provided at the center of the outer arc surface of the bearing bush.

[0007] As a further preferred embodiment, the left side of the inner arc surface of the bearing seat is provided with eight bearing mounting grooves of the same size and evenly distributed circumferentially. The axial length of the bearing mounting groove is equal to the axial length of the bearing, the inner diameter of the bearing mounting groove is equal to the outer diameter of the bearing, the central angle corresponding to the bearing mounting groove is 40°, and the depth of the bearing mounting groove is 5mm less than the thickness of the bearing. Countersunk threaded holes are provided on the outer arc surface of the bearing seat at positions opposite to the centers of each bearing mounting groove. After the eight bearings are respectively assembled into the eight bearing mounting grooves, they are fixed to the bearing seat by countersunk screws. Four evenly distributed arc-shaped circumferential rotation limiting grooves are provided on both sides of the outer arc surface of the bearing seat to limit the rotation of the wind turbine during operation. The bearing housing can rotate circumferentially relative to the upper bearing housing and the lower bearing housing; the outer arc surface of the bearing housing is provided with a first axial limiting boss and a second axial limiting boss to limit the axial movement of the bearing housing relative to the upper bearing housing and the lower bearing housing; the outer arc surface of the bearing housing is also provided with a driven large gear, which is used to drive the bearing housing to rotate circumferentially relative to the upper bearing housing and the lower bearing housing under the action of the circumferential rotation drive module when replacing the bearing; the outer arc surface of the bearing housing, the left side wall of the first axial limiting boss, and the right side wall of the second axial limiting boss are also provided with lubricating oil grooves, which are filled with lubricating medium for lubrication when the bearing housing rotates circumferentially relative to the upper bearing housing and the lower bearing housing.

[0008] As a further preferred embodiment, the axial lengths of both the upper and lower bearing seats are equal to the axial length of the bearing bush seat. The lower wall of the upper bearing seat has two connecting bosses with bolt holes. The upper wall of the lower bearing seat also has two connecting bosses with bolt holes. The upper and lower bearing seats are fixedly connected by connecting bolts, thus forming an integral bearing seat structure. The upper wall of the lower bearing seat has a rectangular groove to provide circumferential rotational space for the driven large gear and to store gear lubricating oil. The upper wall of the lower bearing seat also has a groove for mounting the bearing bush seat. A semi-circular groove, the inner diameter of which is equal to the outer diameter of the outer arc surface of the bearing seat; two identical arc-shaped lower limiting grooves, spaced 90° apart circumferentially, are provided on each side of the lower bearing seat to restrict the circumferential rotation of the bearing seat relative to the upper and lower bearing seats during wind turbine operation. The axial length of the lower limiting groove is equal to the axial length of the circumferential rotation limiting groove, and the central angle of the lower limiting groove is 20° larger than that of the circumferential rotation limiting groove; a threaded hole is provided on the right side of the upper wall of the upper bearing seat for fixing the circumferential rotation support bearing seat; a threaded hole is provided on the upper wall of the upper bearing seat. A rectangular through slot; the upper bearing seat also has a threaded hole on the left side of its upper wall for fixing the circumferential rotation drive motor; the inner wall of the upper bearing seat has a semi-circular groove, the inner diameter of which is equal to the outer diameter of the outer arc surface of the bearing seat; the semi-circular groove also has an arc groove to provide space for the driven gear on its outer arc surface to move when the bearing seat rotates circumferentially, the width of which is 5mm wider than the width of the driven gear; the upper bearing seat has two arc-shaped upper limit grooves on both sides, the same size as the lower limit groove of the lower bearing seat, and circumferentially spaced at 90° intervals; the bearing seat, the After the upper bearing seat and the lower bearing seat are installed and fixed, the left side wall of the first axial limiting boss of the bearing seat coincides with the left side wall of the rectangular groove of the lower bearing seat, the right side wall of the second axial limiting boss of the bearing seat coincides with the right side wall of the rectangular groove of the lower bearing seat, and the geometric center of the four circumferential rotation limiting grooves on both sides of the bearing seat coincides with the geometric center of the two upper limiting grooves on both sides of the upper bearing seat and the two lower limiting grooves on both sides of the lower bearing seat, forming eight arc-shaped "T"-shaped limiting grooves. The axial center of the rectangular through groove is aligned with the axial center of the driven large gear on the outer arc surface of the bearing seat.

[0009] As a further preferred embodiment, the spindle support module includes two sets of spindle support devices, which are symmetrically arranged on both sides of the axial center of the upper bearing seat and the lower bearing seat, for lifting the spindle when replacing the bearing bush; each spindle support device consists of a support telescopic rod with a support bearing bush, a support guide rod, a support base, a support drive threaded rod, a support drive motor, and a support coupling; the inner diameter of the support bearing bush is equal to the outer diameter of the spindle, and the support bearing bush and the support telescopic rod are integrally forged into a single unit; the outer wall of the support telescopic rod is provided with two support guide bosses; the bottom of the support telescopic rod is provided with a cylindrical hole, and the inner wall of the cylindrical hole is provided with an inner driven... The support drive threaded rod has an external drive thread at one end that mates with the internal driven thread, and the other end of the support drive threaded rod is connected to the output shaft of the support drive motor via the supported coupling; the support drive motor has a threaded hole at its bottom, and the support drive motor is fixedly connected to the support base by screws; the inner wall of the support guide rod has two guide grooves that mate with the guide bosses on the outer wall of the support telescopic rod, which restrict the support telescopic rod to only move axially and not rotate circumferentially when it extends and retracts; the bottom of the support guide rod has a connecting boss with a threaded hole, and the support guide rod is fixedly connected to the support base by screws.

[0010] As a further preferred embodiment, the circumferential rotation limiting module includes two sets of circumferential rotation limiting devices. These two sets of devices are symmetrically arranged on both sides of the axial center of the upper bearing seat and the lower bearing seat, and are located between the two main shaft support devices. Each circumferential rotation limiting device consists of four arc-shaped "T"-shaped limiting blocks, a limiting telescopic rod, a limiting telescopic rod support seat, two limiting drive threaded rods, two limiting couplings, and two limiting drive motors. The four limiting blocks are evenly distributed circumferentially and connected to one side of the limiting telescopic rod by screws. The "T"-shaped heads of the four limiting blocks point towards the center of the limiting telescopic rod, engaging with the arc-shaped "T"-shaped limiting groove formed by the bearing seat, the upper bearing seat, and the lower bearing seat. The outer wall of the limiting telescopic rod is provided with two guide bosses, which are circumferentially spaced at 180° intervals. A large circular through hole is located at the center of the bottom of the limiting telescopic rod, the inner diameter of which is larger than that of the main shaft support device. The shaft has an outer diameter 5mm larger than the main shaft's outer diameter. The bottom of the limiting telescopic rod also has two small circular through holes, each with an internal driven thread on its inner wall. One end of the limiting drive threaded rod has an external drive thread that engages with the driven thread on the inner wall of the small circular through hole at the bottom of the limiting telescopic rod. The other end of the limiting drive threaded rod is connected to the output shaft of the limiting drive motor via the limiting coupling. The limiting drive motor is fixed to the limiting telescopic rod support seat by screws. The inner wall of the limiting telescopic rod support seat has two guide grooves that engage with the guide boss on the outer wall of the limiting telescopic rod, restricting the telescopic rod to move only axially and preventing circumferential rotation. The bottom center of the limiting telescopic rod support seat has a large circular through hole with an inner diameter 5mm larger than the main shaft's outer diameter. The bottom of the limiting telescopic rod support seat also has two small circular through holes, the outer diameter of which is equal to the outer diameter of the output shaft of the limiting drive motor.

[0011] As a further preferred embodiment, the circumferential rotation drive module comprises a circumferential rotation support bearing housing, a support bearing, an axial positioning sleeve, a drive pinion, a drive gear shaft, a drive coupling, and a drive motor. The drive motor is fixedly mounted to the upper wall of the upper bearing housing by screws. The output shaft of the drive motor is connected to one end of the drive gear shaft via the drive coupling. The drive pinion is mounted on the drive gear shaft via a connecting key. The other end of the drive gear shaft is supported on the support bearing. The support bearing is installed in the support bearing housing fixed to the upper wall of the upper bearing housing. The width of the drive pinion is 5mm larger than the width of the driven gear, and the width of the drive pinion is 5mm smaller than the width of the rectangular through groove on the upper wall of the upper bearing housing. The tip circle diameter of the drive pinion is 5mm smaller than the length of the rectangular through groove. The axial center of the drive pinion coincides with the axial center of the driven gear and meshes with it, for driving the bearing housing to rotate circumferentially.

[0012] As a further preferred embodiment, the acquisition and control module includes a signal acquisition module and a control module. The signal acquisition module includes twenty-four bearing thickness detection sensors of the same specification. The bearing thickness detection sensors are fixed in the rectangular mounting slots of the bearings by screws and are used to detect the wear depth of the bearings and transmit the detection signals to the control module in real time. The control system is used to receive the detection signals and control the circumferential rotation limit module, the main shaft support module and the circumferential rotation drive to perform corresponding actions according to the signals.

[0013] As a further preferred embodiment, during the operation of the wind turbine, the limiting telescopic rod of the circumferential rotation limiting device is in the extended state, and each "T"-shaped limiting block is respectively located in the "T"-shaped limiting groove; the supporting telescopic rod of the main shaft supporting device is in the retracted state, and the supporting bearing is kept separate from the main shaft.

[0014] The present invention also provides a method for implementing the above-mentioned device for facilitating the replacement of the sliding bearing bush of the main shaft of a wind turbine, comprising the following steps:

[0015] (a) When the three bearing thickness detection sensors installed in the lower bearing position detect that the average wear depth of the bearing exceeds the set wear threshold, the signal is sent to the control system. During the wind turbine shutdown, the control system first controls the limit drive motor in the circumferential rotation limit module to rotate clockwise. The limit drive threaded rod is driven to rotate through the limit coupling. With the help of the threaded engagement between the limit drive threaded rod and the limit telescopic rod, as well as the guiding action of the guide boss on the outer wall of the limit telescopic rod and the guide groove on the inner wall of the limit telescopic rod support seat, the limit telescopic rod is driven to retract, so that each "T" limit block exits from the corresponding "T" limit groove.

[0016] (b) After the “T” shaped limit block exits the limit groove, the control system will then control the support drive motor in the main spindle support module to rotate clockwise. Through the support coupling, the support drive threaded rod will rotate. With the help of the threaded engagement between the support drive threaded rod and the support telescopic rod, as well as the guiding action of the guide boss on the outer wall of the support telescopic rod and the guide groove on the inner wall of the support guide rod, the support telescopic rod will be driven to extend until the support bearing lifts the main spindle to the predetermined height.

[0017] (c) After the main shaft is lifted, the control system then controls the drive motor in the circumferential rotation drive module to rotate clockwise, and drives the drive pinion to rotate through the drive coupling. The drive pinion meshes with the driven large gear fixed on the outer arc surface of the bearing seat, thereby driving the bearing seat to rotate circumferentially, so that the bearing worn to the set wear threshold leaves the lower bearing position, and at the same time rotates the bearing that has not been worn to the set wear threshold to that position, as the new lower bearing position bearing;

[0018] (d) After the replacement of the bearing that has been worn to the set wear threshold is completed, the control system will control the support drive motor in the main spindle support module to rotate counterclockwise, and drive the support drive threaded rod to rotate through the support coupling. With the help of the threaded engagement between the support drive threaded rod and the support telescopic rod, as well as the guiding action of the guide boss on the outer wall of the support telescopic rod and the guide groove on the inner wall of the support guide rod, the support telescopic rod is driven to retract and the main spindle is lowered.

[0019] (e) After the main shaft is lowered, the control system will control the limit drive motor in the circumferential rotation limit module to rotate counterclockwise. Through the limit coupling, the limit drive threaded rod will be driven to rotate. With the help of the threaded engagement between the limit drive threaded rod and the limit telescopic rod, as well as the guiding action of the guide boss on the outer wall of the limit telescopic rod and the guide groove on the inner wall of the limit telescopic rod support seat, the limit telescopic rod will be driven to extend, so that each "T" limit block is inserted into the corresponding "T" limit groove, and the bearing replacement is completed.

[0020] (f) Once the newly replaced bearing reaches the set wear threshold, repeat steps (a) to (e) to replace the bearing until all bearings reach the set wear threshold. Only then will maintenance personnel need to go up the tower to replace all bearings.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention can detect the wear depth of the bearing bush online, and can automatically replace the bearing bush at the lower bearing position that has reached the set wear threshold through the online coordinated action of the main shaft support module, the circumferential rotation limit module, the circumferential rotation drive module and the acquisition and control module during the wind turbine shutdown. This process does not require waiting until the wind turbine main shaft sliding bearing bush completely fails and the wind turbine cannot work before replacing the bearing bush, which effectively reduces the waste of wind energy resources and improves the operating economy of wind power generation.

[0023] (2) This invention rotates other bearings in the circumferential direction of the sliding bearing that have not been worn to the set wear threshold to the position of the currently failed lower bearing bearing, replacing the currently worn and failed lower bearing bearing with a new bearing bearing. This eliminates the need for maintenance personnel to go up the tower to replace the bearings once the bearings at the lower bearing bearing position are worn, reducing the number of times maintenance personnel need to go up the tower to replace bearings, effectively reducing the risk of high-altitude operations and saving a lot of manpower and material costs. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the bearing bush structure in the sliding bearing module of the present invention;

[0026] Figure 3 This is a schematic diagram of the bearing seat structure in the sliding bearing module of the present invention (left side view);

[0027] Figure 4 This is a schematic diagram of the bearing seat structure in the sliding bearing module of the present invention (right side view);

[0028] Figure 5 This is a schematic diagram of the assembly structure of the bearing bush and bearing bush seat in the sliding bearing module of the present invention;

[0029] Figure 6 This is a schematic diagram of the upper bearing seat structure in the sliding bearing module of the present invention;

[0030] Figure 7 This is a schematic diagram of the lower bearing seat structure in the sliding bearing module of the present invention;

[0031] Figure 8 This is a front sectional view of the spindle support device in the spindle support module of the present invention;

[0032] Figure 9 This is a schematic diagram of the support telescopic rod structure with support bearing bush in the main shaft support module of the present invention;

[0033] Figure 10 This is a schematic diagram of the support guide rod structure in the spindle support module of the present invention;

[0034] Figure 11 This is a schematic diagram of the circumferential rotation limiting device in the circumferential rotation limiting module of the present invention;

[0035] Figure 12 This is a schematic diagram of the limiting telescopic rod structure in the circumferential rotation limiting module of the present invention;

[0036] Figure 13 This is a schematic diagram of the limiting telescopic rod support structure in the circumferential rotation limiting module of the present invention;

[0037] Figure 14 This is a schematic diagram of the circumferential rotation drive module structure of the present invention;

[0038] In the above figures, the component names corresponding to the reference numerals are as follows:

[0039] 1-Spindle, 2-Bearing shell, 201-Rectangular mounting groove, 202-Countersunk threaded hole, 203-Threaded hole, 3-Bearing shell seat, 301-Bearing shell mounting groove, 302-Countersunk threaded hole, 303-Circumferential rotation limiting groove, 304-First axial limiting boss, 305-Second axial limiting boss, 306-Driven large gear, 307-Lubricating oil groove, 4-Bearing shell thickness detection sensor, 5-Upper bearing seat, 501-Connecting boss, 502-Bolt hole, 503 - Threaded hole, 504- Rectangular through groove, 505- Threaded hole, 506- Semi-circular groove, 507- Arc groove, 508- Arc-shaped upper limit groove, 6- Lower bearing seat, 601- Connecting boss, 602- Bolt hole, 603- Rectangular groove, 604- Semi-circular groove, 605- Lower limit groove, 7- Bolt, 8- Support telescopic rod, 801- Support bearing shell, 802- Support guide boss, 803- Cylindrical hole, 804- Internal driven thread, 9- Support guide Rod, 901-Guide Groove, 902-Connecting Boss, 903-Threaded Hole, 10-Support Base, 11-Support Drive Threaded Rod, 1101-External Drive Thread, 12-Support Drive Motor, 13-Support Coupling, 14-Screw, 15-Screw, 16-"T" Limiting Block, 17-Limiting Telescopic Rod, 1701-Guide Boss, 1702-Large Circular Through Hole, 1703-Small Circular Through Hole, 1704-Driven Thread, 18-Limiting Telescopic Rod Support base, 1801-guide groove, 1802-large circular through hole, 1803-small circular through hole, 19-limit drive threaded rod, 1901-external drive thread, 20-limit coupling, 21-limit drive motor, 22-screw, 23-support bearing seat, 24-support bearing, 25-axial positioning sleeve, 26-connecting key, 27-drive pinion, 28-drive gear shaft, 29-drive coupling, 30-drive motor, 31-countersunk screw. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0041] like Figures 1 to 14As shown, a device for facilitating the replacement of sliding bearing bushes on the main shaft of a wind turbine includes a sliding bearing module, a main shaft support module, a circumferential rotation limiting module, a circumferential rotation drive module, and a data acquisition and control module. The sliding bearing module consists of eight bushes 2, bush seats 3, an upper bearing seat 5, and a lower bearing seat 6 of identical dimensions and material characteristics, used to support the main shaft 1 during wind turbine operation. The main shaft support module is used to lift the main shaft 1 when the wind turbine is shut down for bush 2 replacement, separating the main shaft 1 from the bushes 2 to facilitate bush 2 replacement. The system includes a working space; the circumferential rotation limiting module is used to limit the circumferential rotation of the bearing seat 3 during the operation of the wind turbine; the circumferential rotation drive module is used to drive the circumferential rotation of the bearing seat 3 when the wind turbine stops to replace the bearing 2; the acquisition and control module is used to acquire the wear signal of the bearing 2 and, when replacing the bearing 2, control the main shaft support module to lift the main shaft 1, control the circumferential rotation limiting module to release the limitation on the bearing seat 3, and control the circumferential rotation drive module to drive the bearing seat 3 to rotate to the designated work position to complete the bearing replacement operation;

[0042] The central angle of each bearing bush 2 is 40°. One side of each bearing bush 2 is provided with three rectangular mounting slots 201 of the same size and circumferentially spaced at 15° intervals, for mounting the bearing bush thickness detection sensor 4. The outer arc surface of the bearing bush 2 is provided with countersunk threaded holes 202 at the positions opposite to the center of each rectangular mounting slot 201. The outer arc surface of the bearing bush 2 is also provided with a threaded hole 203 at the center for connecting with the bearing bush seat 3.

[0043] The bearing seat 3 has eight identical, circumferentially evenly distributed bearing mounting grooves 301 on the left side of its inner arc surface. The axial length of each bearing mounting groove 301 is equal to the axial length of the bearing 2, the inner diameter of each bearing mounting groove 301 is equal to the outer diameter of the bearing 2, the central angle of each bearing mounting groove 301 is 40°, and the depth of each bearing mounting groove 301 is 5mm less than the thickness of the bearing 2. The outer arc surface of the bearing seat 3 has countersunk threaded holes 302 at positions opposite to the center of each bearing mounting groove 301. After the eight bearings 2 are respectively assembled into the eight bearing mounting grooves 301, they are fixed to the bearing seat 3 by countersunk screws 31. The outer arc surface of the bearing seat 3 has four circumferentially evenly distributed arc-shaped circumferential rotation limiting grooves 303 on both sides to limit the bearing rotation during wind turbine operation. The bearing seat 3 can rotate circumferentially relative to the upper bearing seat 5 and the lower bearing seat 6; the outer arc surface of the bearing seat 3 is provided with a first axial limiting boss 304 and a second axial limiting boss 305, which are used to limit the axial movement of the bearing seat 3 relative to the upper bearing seat 5 and the lower bearing seat 6; the outer arc surface of the bearing seat 3 is also provided with a driven large gear 306, which is used to drive the bearing seat 3 to rotate circumferentially relative to the upper bearing seat 5 and the lower bearing seat 6 under the action of the circumferential rotation drive module when replacing the bearing 2; the outer arc surface of the bearing seat 3, the left side wall of the first axial limiting boss 304, and the right side wall of the second axial limiting boss 305 are also provided with lubricating oil grooves 307, which are filled with lubricating medium for lubrication when the bearing seat 3 rotates circumferentially relative to the upper bearing seat 5 and the lower bearing seat 6.

[0044] The axial lengths of both the upper bearing seat 5 and the lower bearing seat 6 are equal to the axial length of the bearing bush seat 3. The lower wall of the upper bearing seat 5 has two connecting bosses 501, each with bolt holes 502. The upper wall of the lower bearing seat 6 has two connecting bosses 601, each with bolt holes 602. The upper bearing seat 5 and the lower bearing seat 6 are fixedly connected by connecting bolts 7, thus forming an integral bearing seat structure. The upper wall of the lower bearing seat 6 has a rectangular groove 603 to provide circumferential rotation space for the driven large gear 306 and to store gear lubricating oil. The upper wall of the lower bearing seat 6 also has a semi-circular groove 60 for mounting the bearing bush seat 3. 4. The inner diameter of the semi-circular groove 604 is equal to the outer diameter of the outer arc surface of the bearing seat 3; two arc-shaped lower limiting grooves 605 of the same size and circumferentially spaced at 90° intervals are provided on each side of the lower bearing seat 6, which are used to limit the circumferential rotation of the bearing seat 3 relative to the upper bearing seat 5 and the lower bearing seat 6 during the operation of the wind turbine. The axial length of the lower limiting groove 605 is equal to the axial length of the circumferential rotation limiting groove 303, and the central angle of the lower limiting groove 605 is 20° larger than the central angle of the circumferential rotation limiting groove 303; a threaded hole 503 is provided on the right side of the upper wall of the upper bearing seat 5 for fixing the circumferential rotation support bearing seat 23; a rectangular through groove 504 is provided on the upper wall of the upper bearing seat 5. The upper bearing seat 5 also has a threaded hole 505 on the left side of its upper wall for fixing the circumferential rotation drive motor 30; the inner wall of the upper bearing seat 5 has a semi-circular groove 506, the inner diameter of which is equal to the outer diameter of the outer arc surface of the bearing seat 3; the semi-circular groove 506 also has an arc groove 507 for providing space for the driven gear 306 on its outer arc surface to move when the bearing seat 3 rotates circumferentially, and the width of the arc groove 507 is 5mm wider than the width of the driven gear 306; the upper bearing seat 5 has two arc-shaped upper limit grooves 508 on both sides, the same size as the lower limit groove 605 of the lower bearing seat 6, and distributed circumferentially at 90° intervals; the bearing seat 3, the upper bearing seat 3, the upper bearing seat 5 ... After the bearing seat 5 and the lower bearing seat 6 are installed and fixed, the left side wall of the first axial limiting boss 304 of the bearing seat 3 coincides with the left side wall of the rectangular groove 603 of the lower bearing seat 6, and the right side wall of the second axial limiting boss 305 of the bearing seat 3 coincides with the right side wall of the rectangular groove 603 of the lower bearing seat 6. The geometric centers of the four circumferential rotation limiting grooves 303 on both sides of the bearing seat 3 coincide with the geometric centers of the two upper limiting grooves 508 on both sides of the upper bearing seat 5 and the two lower limiting grooves 605 on both sides of the lower bearing seat 6, respectively, forming eight arc-shaped "T"-shaped limiting grooves. The axial center of the rectangular through groove 504 is aligned with the axial center of the driven large gear 306 on the outer arc surface of the bearing seat 3.

[0045] The spindle support module includes two sets of spindle support devices, which are symmetrically arranged on both sides of the axial center of the upper bearing seat 5 and the lower bearing seat 6, and are used to lift the spindle 1 when replacing the bearing bush 2. The spindle support device consists of a support telescopic rod 8 with a support bearing bush 801, a support guide rod 9, a support base 10, a support drive threaded rod 11, a support drive motor 12, and a support coupling 13. The inner diameter of the support bearing bush 801 is equal to the outer diameter of the spindle 1, and the support bearing bush 801 and the support telescopic rod 8 are integrally forged into a whole. The outer wall of the support telescopic rod 8 is provided with two support guide bosses 802. The bottom of the support telescopic rod 8 is provided with a cylindrical hole 803, and the inner wall of the cylindrical hole 803 is provided with an internal driven thread 804. One end of the moving threaded rod 11 is provided with an external driving thread 1101 that mates with the internal driven thread 804. The other end of the supporting driving threaded rod 11 is connected to the output shaft of the supporting driving motor 12 through the supported coupling 13. The supporting driving motor 12 is provided with a threaded hole at its bottom. The supporting driving motor 12 is fixedly connected to the supporting base 10 by screws 14. The inner wall of the supporting guide rod 9 is provided with two guide grooves 901 that mate with the guide bosses 802 on the outer wall of the supporting telescopic rod 8. These grooves are used to restrict the supporting telescopic rod 8 from axial movement and prevent circumferential rotation when it extends and retracts. The bottom of the supporting guide rod 9 is provided with a connecting boss 902. The connecting boss 902 is provided with a threaded hole 903. The supporting guide rod 9 is fixedly connected to the supporting base 10 by screws 15.

[0046] The circumferential rotation limiting module includes two sets of circumferential rotation limiting devices, which are symmetrically arranged on both sides of the axial center of the upper bearing seat 5 and the lower bearing seat 6, and located between the two sets of main shaft support devices. Each circumferential rotation limiting device consists of four arc-shaped "T"-shaped limiting blocks 16, limiting telescopic rods 17, limiting telescopic rod support seats 18, two limiting drive threaded rods 19, two limiting couplings 20, and two limiting drive motors 21. The four limiting blocks 16 are evenly distributed circumferentially and connected to the limiting device by screws 22. On one side of the telescopic rod 17, the "T"-shaped heads of the four limiting blocks 16 point to the center of the telescopic rod 17, and cooperate with the arc-shaped "T"-shaped limiting groove formed by the bearing seat 3, the upper bearing seat 5, and the lower bearing seat 6; the outer wall of the telescopic rod 17 is provided with two guide bosses 1701, which are distributed circumferentially at 180° intervals; a large circular through hole 1702 is provided at the center of the bottom of the telescopic rod 17, the inner diameter of which is 5mm larger than the outer diameter of the main shaft 1; the bottom of the telescopic rod 17... It also has two small circular through holes 1703, and the inner walls of the two small circular through holes 1703 are respectively provided with internal driven threads 1704. One end of the limiting drive threaded rod 19 is provided with an external drive thread 1901 that mates with the driven thread 1704 on the inner wall of the small circular through hole 1703 at the bottom of the limiting telescopic rod 17. The other end of the limiting drive threaded rod 19 is connected to the output shaft of the limiting drive motor 21 through the limiting coupling 20. The limiting drive motor 21 is fixed to the limiting telescopic rod support 18 by screws. The limiting telescopic rod The inner wall of the support base 18 is provided with two guide grooves 1801 that cooperate with the guide bosses 1701 on the outer wall of the limiting telescopic rod 17, which are used to restrict the telescopic rod 17 to move only along the axial direction and not rotate circumferentially; the bottom center of the limiting telescopic rod support base 18 is provided with a large circular through hole 1802, the inner diameter of the large circular through hole 1802 is 5mm larger than the outer diameter of the main shaft 1; the bottom of the limiting telescopic rod support base 18 is also provided with two small circular through holes 1803, the outer diameter of the small circular through holes 1803 is equal to the outer diameter of the output shaft of the limiting drive motor 21.

[0047] The circumferential rotation drive module consists of a circumferential rotation support bearing seat 23, a support bearing 24, an axial positioning sleeve 25, a drive pinion 27, a drive gear shaft 28, a drive coupling 29, and a drive motor 30. The drive motor 30 is fixedly mounted to the upper wall of the upper bearing seat 5 by screws. The output shaft of the drive motor 30 is connected to one end of the drive gear shaft 28 through the drive coupling 29. The drive pinion 27 is mounted on the drive gear shaft 28 through a connecting key 26. The other end of the drive gear shaft 28 is supported by the support bearing. 24; The support bearing 24 is installed in the support bearing seat 23 fixed on the upper wall of the upper bearing seat 5; The width of the driving pinion 27 is 5mm larger than the width of the driven gear 306, the width of the driving pinion 27 is 5mm smaller than the width of the rectangular through groove 504 on the upper wall of the upper bearing seat 5, the tooth tip circle diameter of the driving pinion 27 is 5mm smaller than the length of the rectangular through groove 504, the axial center of the driving pinion 27 coincides with the axial center of the driven gear 306 and meshes with each other, and is used to drive the bearing seat 3 to rotate circumferentially.

[0048] The acquisition and control module includes a signal acquisition module and a control module. The signal acquisition module includes twenty-four bearing thickness detection sensors 4 of the same specification. The bearing thickness detection sensors 4 are fixed in the rectangular mounting groove 201 of the bearing 2 by screws. They are used to detect the wear depth of the bearing 2 and transmit the detection signal to the control module in real time. The control system is used to receive the detection signal and control the circumferential rotation limit module, the main shaft support module and the circumferential rotation drive to perform corresponding actions according to the signal.

[0049] During the operation of the wind turbine, the limiting telescopic rod 17 of the circumferential rotation limiting device is in the extended state, and each "T"-shaped limiting block 16 is respectively in the "T"-shaped limiting groove; the supporting telescopic rod 8 of the main shaft supporting device is in the retracted state, and the supporting bearing 801 is separated from the main shaft 1.

[0050] When replacing the bearing bush using the aforementioned device for replacing the sliding bearing bush of the wind turbine main shaft, the following steps are performed:

[0051] (a) When the three bearing thickness detection sensors 4 installed in the bearing 2 at the lower bearing position detect that the average wear depth of the bearing 2 exceeds the set wear threshold, a signal is sent to the control system. During the wind turbine shutdown, the control system first controls the limit drive motor 21 in the circumferential rotation limit module to rotate clockwise. Through the limit coupling 20, the limit drive threaded rod 19 is driven to rotate. With the help of the threaded engagement between the limit drive threaded rod 19 and the limit telescopic rod 17, as well as the guiding action of the guide boss 1701 on the outer wall of the limit telescopic rod 17 and the guide groove 1801 on the inner wall of the limit telescopic rod support seat 18, the limit telescopic rod 17 is driven to retract, so that each "T" shaped limit block 16 exits from the corresponding "T" shaped limit groove.

[0052] (b) After the “T” shaped limiting block 16 exits the limiting groove, the control system will then control the support drive motor 12 in the main spindle support module to rotate clockwise. Through the support coupling 13, the support drive threaded rod 11 will rotate. With the help of the threaded engagement between the support drive threaded rod 11 and the support telescopic rod 8, as well as the guiding action of the guide boss 802 on the outer wall of the support telescopic rod 8 and the guide groove 901 on the inner wall of the support guide rod 9, the support telescopic rod 8 will be driven to extend until the support bearing 801 lifts the main spindle 1 to the predetermined height.

[0053] (c) After the main shaft 1 is lifted, the control system then controls the drive motor 30 in the circumferential rotation drive module to rotate clockwise. Through the drive coupling 29, the drive pinion 27 is driven to rotate. The drive pinion 27 meshes with the driven large gear 306 fixed on the outer arc surface of the bearing seat 3, thereby driving the bearing seat 3 to rotate circumferentially. This causes the bearing 2 that has been worn to the set wear threshold to leave the lower bearing position. At the same time, the bearing 2 that has not been worn to the set wear threshold is rotated to that position as the new lower bearing position bearing 2.

[0054] (d) After the replacement of the bearing 2 that has been worn to the set wear threshold is completed, the control system will control the support drive motor 12 in the main spindle support module to rotate counterclockwise, and drive the support drive threaded rod 11 to rotate through the support coupling 13. With the help of the threaded engagement between the support drive threaded rod 11 and the support telescopic rod 8, as well as the guiding action of the guide boss 802 on the outer wall of the support telescopic rod 8 and the guide groove 901 on the inner wall of the support guide rod 9, the support telescopic rod 8 is driven to retract and the main spindle 1 is lowered.

[0055] (e) After the main shaft 1 is lowered, the control system will control the limit drive motor 21 in the circumferential rotation limit module to rotate counterclockwise. Through the limit coupling 20, the limit drive threaded rod 19 will rotate. With the help of the threaded engagement between the limit drive threaded rod 19 and the limit telescopic rod 17, as well as the guiding action of the guide boss 1701 on the outer wall of the limit telescopic rod 17 and the guide groove 1801 on the inner wall of the limit telescopic rod support seat 18, the limit telescopic rod 17 will be driven to extend, so that each "T" shaped limit block 16 is inserted into the corresponding "T" shaped limit groove, and the bearing 2 is replaced.

[0056] (f) Once the newly replaced bearing 2 reaches the set wear threshold, repeat steps (a) to (e) to replace the bearing 2 until all bearing 2 reach the set wear threshold. Only then will maintenance personnel need to go up the tower to replace all bearing 2.

[0057] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any changes made based on the design principles of the present invention, or any non-creative modifications made thereon, shall fall within the scope of protection of the present invention.

Claims

1. A device for facilitating the replacement of sliding bearing bushes on the main shaft of a wind turbine generator, comprising a sliding bearing module, a main shaft support module, a circumferential rotation limiting module, a circumferential rotation drive module, and a data acquisition and control module, characterized in that: The sliding bearing module consists of eight bearing bushes (2), bearing bush seats (3), upper bearing seats (5), and lower bearing seats (6) with the same size and material characteristics, and is used to support the main shaft (1) during the operation of the wind turbine. The main shaft support module is used to lift the main shaft (1) when the wind turbine is shut down for bearing replacement, so that the main shaft (1) is separated from the bearing (2) to provide space for bearing (2) replacement operation; The circumferential rotation limiting module is used to limit the circumferential rotation of the bearing seat (3) during the operation of the wind turbine; The circumferential rotation drive module is used to drive the circumferential rotation of the bearing seat (3) when the wind turbine is shut down to replace the bearing (2); The acquisition and control module is used to acquire the wear signal of the bearing bush (2) and, when replacing the bearing bush (2), control the main shaft support module to lift the main shaft (1), control the circumferential rotation limit module to release the limit on the bearing bush seat (3), and control the circumferential rotation drive module to drive the bearing bush seat (3) to rotate to the designated work position to complete the bearing bush replacement operation; The bearing seat (3) has eight bearing mounting grooves (301) of the same size and evenly distributed in the circumference on the left side of the inner arc surface. The axial length of the bearing mounting groove (301) is equal to the axial length of the bearing (2). The inner diameter of the bearing mounting groove (301) is equal to the outer diameter of the bearing (2). The central angle corresponding to the bearing mounting groove (301) is 40°. The depth of the bearing mounting groove (301) is 5mm less than the thickness of the bearing (2). The outer arc surface of the bearing seat (3) is provided with countersunk threaded holes (302) at the position opposite to the center of each bearing mounting groove (301). After the eight bearings (2) are respectively assembled into the eight bearing mounting grooves (301), they are fixed on the bearing seat (3) by countersunk screws (31). The bearing seat (3) has four circumferentially evenly distributed arc-shaped circumferential rotation limiting grooves (303) on both sides of the outer arc surface, which are used to limit the circumferential rotation of the bearing seat (3) relative to the upper bearing seat (5) and the lower bearing seat (6) during the operation of the wind turbine. The outer arc surface of the bearing seat (3) is provided with a first axial limiting boss (304) and a second axial limiting boss (305) to limit the axial movement of the bearing seat (3) relative to the upper bearing seat (5) and the lower bearing seat (6). The outer arc surface of the bearing seat (3) is also provided with a driven large gear (306), which is used to drive the bearing seat (3) to rotate circumferentially relative to the upper bearing seat (5) and the lower bearing seat (6) when the bearing (2) is replaced; The outer arc surface of the bearing seat (3), the left side wall of the first axial limiting boss (304), and the right side wall of the second axial limiting boss (305) are also provided with lubricating oil grooves (307). The lubricating oil grooves (307) are filled with lubricating medium for lubrication when the bearing seat (3) rotates circumferentially relative to the upper bearing seat (5) and the lower bearing seat (6).

2. The device for facilitating the replacement of the sliding bearing bush of the main shaft of a wind turbine according to claim 1, characterized in that: The central angle of each bearing bush (2) is 40°. One side of the bearing bush (2) is provided with three rectangular mounting grooves (201) of the same size and distributed circumferentially at 15° intervals. The outer arc surface of the bearing bush (2) is provided with countersunk threaded holes (202) at the position opposite to the center of each rectangular mounting groove (201). The outer arc surface of the bearing bush (2) is also provided with a threaded hole (203) for connecting with the bearing bush seat (3).

3. The device for facilitating the replacement of the sliding bearing bush of the main shaft of a wind turbine according to claim 2, characterized in that: The axial lengths of the upper bearing seat (5) and the lower bearing seat (6) are both equal to the axial length of the bearing bush seat (3). The lower wall of the upper bearing seat (5) is provided with two connecting bosses (501), and the connecting bosses (501) are provided with bolt holes (502). The upper wall of the lower bearing seat (6) is provided with two connecting bosses (601), and the connecting bosses (601) are provided with bolt holes (602). The upper bearing seat (5) and the lower bearing seat (6) are fixedly connected by connecting bolts (7), thereby forming an integral bearing seat structure. The upper wall of the lower bearing seat (6) is provided with a rectangular groove ( 603), used to provide circumferential rotation space for the driven large gear (306) and store gear lubricating oil; the upper wall of the lower bearing seat (6) is also provided with a semi-circular groove (604) for installing the bearing seat (3), the inner diameter of the semi-circular groove (604) is equal to the outer diameter of the outer arc surface of the bearing seat (3); the lower bearing seat (6) is provided with two arc-shaped lower limiting grooves (605) of the same size and circumferentially spaced at 90° intervals on each side, used to limit the circumferential rotation of the bearing seat (3) relative to the upper bearing seat (5) and the lower bearing seat (6) during the operation of the wind turbine generator, the lower The axial length of the limiting groove (605) is equal to the axial length of the circumferential rotation limiting groove (303), and the central angle of the lower limiting groove (605) is 20° larger than the central angle of the circumferential rotation limiting groove (303); the upper bearing seat (5) has a threaded hole (503) on the right side of its upper wall for fixing the circumferential rotation support bearing seat (23); the upper wall of the upper bearing seat (5) has a rectangular through groove (504); the upper wall of the upper bearing seat (5) also has a threaded hole (505) on the left side of its upper wall for fixing the drive motor (30) in the circumferential rotation drive module; the inner wall of the upper bearing seat (5) has a A semi-circular groove (506) is provided, the inner diameter of which is equal to the outer diameter of the outer arc surface of the bearing seat (3); an arc groove (507) is also provided on the semi-circular groove (506) to provide space for the driven gear (306) on the outer arc surface of the bearing seat (3) to move when the bearing seat (3) rotates in the circumferential direction, and the width of the arc groove (507) is 5mm wider than the width of the driven gear (306); two arc-shaped upper limit grooves (508) with the same size as the lower limit groove (605) of the lower bearing seat (6) and circumferentially spaced at 90° intervals are provided on both sides of the upper bearing seat (5).After the bearing seat (3), the upper bearing seat (5), and the lower bearing seat (6) are installed and fixed, the left side wall of the first axial limiting boss (304) of the bearing seat (3) coincides with the left side wall of the rectangular groove (603) of the lower bearing seat (6), the right side wall of the second axial limiting boss (305) of the bearing seat (3) coincides with the right side wall of the rectangular groove (603) of the lower bearing seat (6), the geometric center of the four circumferential rotation limiting grooves (303) on both sides of the bearing seat (3) coincides with the geometric center of the two upper limiting grooves (508) on both sides of the upper bearing seat (5) and the two lower limiting grooves (605) on both sides of the lower bearing seat (6), forming eight arc-shaped "T"-shaped limiting grooves. The axial center of the rectangular through groove (504) is aligned with the axial center of the driven large gear (306) on the outer arc surface of the bearing seat (3). The circumferential rotation drive module consists of a circumferential rotation support bearing seat (23), a support bearing (24), an axial positioning sleeve (25), a drive pinion (27), a drive gear shaft (28), a drive coupling (29), and a drive motor (30). The drive motor (30) in the circumferential rotation drive module is fixedly installed on the upper wall of the upper bearing seat (5) by screws. The output shaft of the drive motor (30) in the circumferential rotation drive module is connected to one end of the drive gear shaft (28) through the drive coupling (29). The drive pinion (27) is installed on the drive gear shaft (28) through a connecting key (26). The drive gear shaft (28) The other end is supported on the support bearing (24); the support bearing (24) is installed in the support bearing seat (23) fixed on the upper wall of the upper bearing seat (5); the width of the driving pinion (27) is 5mm larger than the width of the driven gear (306), the width of the driving pinion (27) is 5mm smaller than the width of the rectangular through groove (504) on the upper wall of the upper bearing seat (5), the tooth tip circle diameter of the driving pinion (27) is 5mm smaller than the length of the rectangular through groove (504), the axial center of the driving pinion (27) coincides with the axial center of the driven gear (306) and meshes with each other, and is used to drive the bearing seat (3) to rotate circumferentially.

4. The device for facilitating the replacement of the sliding bearing bush of the main shaft of a wind turbine according to claim 3, characterized in that: The main spindle support module includes two sets of main spindle support devices, which are symmetrically arranged on both sides of the axial center of the upper bearing seat (5) and the lower bearing seat (6) to lift the main spindle (1) when replacing the bearing shell (2); the main spindle support device consists of a support telescopic rod (8) with a support bearing shell (801), a support guide rod (9), a support base (10), a support drive threaded rod (11), a support drive motor (12), and a support coupling (13); the inner diameter of the support bearing shell (801) is equal to the outer diameter of the main spindle (1), and the support bearing shell (801) and the support telescopic rod (8) are integrally forged into a whole; the outer wall of the support telescopic rod (8) is provided with two support guide bosses (802); the bottom of the support telescopic rod (8) is provided with a cylindrical hole (803), and the inner wall of the cylindrical hole (803) is provided with an internal driven thread (804); the support drive... One end of the threaded rod (11) is provided with an external drive thread (1101) that mates with the internal driven thread (804). The other end of the support drive threaded rod (11) is connected to the output shaft of the support drive motor (12) through the support coupling (13). The support drive motor (12) is provided with a threaded hole at the bottom. The support drive motor (12) is fixedly connected to the support base (10) by screws (14). The inner wall of the support guide rod (9) is provided with two guide grooves (901) that mate with the guide bosses (802) on the outer wall of the support telescopic rod (8). These grooves are used to restrict the support telescopic rod (8) from moving axially and not rotating circumferentially when it extends and retracts. The bottom of the support guide rod (9) is provided with a connecting boss (902). The connecting boss (902) is provided with a threaded hole (903). The support guide rod (9) is fixedly connected to the support base (10) by screws (15).

5. The device for facilitating the replacement of the sliding bearing bush of the main shaft of a wind turbine according to claim 4, characterized in that: The circumferential rotation limiting module includes two sets of circumferential rotation limiting devices. The two sets of circumferential rotation limiting devices are symmetrically arranged on both sides of the axial center of the upper bearing seat (5) and the lower bearing seat (6), and are located between the two sets of main shaft support devices. The circumferential rotation limiting device consists of four arc-shaped "T"-shaped limiting blocks (16), a limiting telescopic rod (17), a limiting telescopic rod support seat (18), two limiting drive threaded rods (19), two limiting couplings (20), and two limiting drive motors (21). The four limiting blocks (16) are evenly distributed circumferentially and are connected to the limiting telescopic rod (17) by screws (22). On one side, the "T"-shaped heads of the four limiting blocks (16) point to the center of the limiting telescopic rod (17), and cooperate with the arc-shaped "T"-shaped limiting groove formed by the bearing seat (3), the upper bearing seat (5) and the lower bearing seat (6); the outer wall of the limiting telescopic rod (17) is provided with two guide bosses (1701), which are distributed circumferentially at 180° intervals; a large circular through hole (1702) is provided at the center of the bottom of the limiting telescopic rod (17), the inner diameter of the circular through hole (1702) is 5mm larger than the outer diameter of the main shaft (1), and the bottom of the limiting telescopic rod (17) is also provided with two Small circular through holes (1703), the inner walls of the two small circular through holes (1703) are respectively provided with internal driven threads (1704), one end of the limiting drive thread rod (19) is provided with an external drive thread (1901) that mates with the driven thread (1704) on the inner wall of the small circular through hole (1703) at the bottom of the limiting telescopic rod (17), the other end of the limiting drive thread rod (19) is connected to the output shaft of the limiting drive motor (21) through the limiting coupling (20); the limiting drive motor (21) is fixed on the limiting telescopic rod support (18) by screws; the limiting telescopic rod support (18) 18) The inner wall surface is provided with two guide grooves (1801) that cooperate with the guide boss (1701) on the outer wall surface of the limiting telescopic rod (17) to restrict the limiting telescopic rod (17) to move only along the axial direction and not rotate circumferentially; the bottom center of the limiting telescopic rod support (18) is provided with a large circular through hole (1802), the inner diameter of the large circular through hole (1802) is 5mm larger than the outer diameter of the main shaft (1); the bottom of the limiting telescopic rod support (18) is also provided with two small circular through holes (1803), the outer diameter of the small circular through holes (1803) is equal to the outer diameter of the output shaft of the limiting drive motor (21).

6. The device for facilitating the replacement of the sliding bearing bush of the main shaft of a wind turbine according to claim 5, characterized in that: The acquisition and control module includes a signal acquisition module and a control module. The signal acquisition module includes twenty-four bearing thickness detection sensors (4) of the same specification. The bearing thickness detection sensors (4) are fixed in the rectangular mounting groove (201) of the bearing (2) by screws. They are used to detect the wear depth of the bearing (2) and transmit the detection signal to the control module in real time. The control module is used to receive the detection signal and control the circumferential rotation limit module, the main shaft support module and the circumferential rotation drive module to perform corresponding actions according to the signal.

7. The device for facilitating the replacement of the sliding bearing bush of the main shaft of a wind turbine according to claim 6, characterized in that: During the operation of the wind turbine, the limiting telescopic rod (17) of the circumferential rotation limiting device is in the extended state, and each "T"-shaped limiting block (16) is in the "T"-shaped limiting groove respectively; the supporting telescopic rod (8) of the main shaft supporting device is in the retracted state, and the supporting bearing (801) is separated from the main shaft (1).

8. A method for using the apparatus of claim 7 for facilitating the replacement of the sliding bearing bush of a wind turbine main shaft, characterized in that, Includes the following steps: (a) When the three bearing thickness detection sensors (4) installed in the lower bearing position bearing (2) detect that the average wear depth of the bearing (2) exceeds the set wear threshold, the signal is sent to the control module. During the wind turbine shutdown, the control module first controls the limit drive motor (21) in the circumferential rotation limit module to rotate clockwise. Through the limit coupling (20), the limit drive threaded rod (19) is driven to rotate. With the help of the threaded fit between the limit drive threaded rod (19) and the limit telescopic rod (17) and the guide boss (1701) on the outer wall of the limit telescopic rod (17) and the guide groove (1801) on the inner wall of the limit telescopic rod support seat (18), the limit telescopic rod (17) is driven to retract, so that each "T" limit block (16) exits from the corresponding "T" limit groove. (b) After the "T" shaped limit block (16) exits the limit groove, the control module will then control the support drive motor (12) in the main shaft support module to rotate clockwise, and drive the support drive threaded rod (11) to rotate through the support coupling (13). With the help of the threaded engagement between the support drive threaded rod (11) and the support telescopic rod (8) and the guiding action of the guide boss (802) on the outer wall of the support telescopic rod (8) and the guide groove (901) on the inner wall of the support guide rod (9), the support telescopic rod (8) is driven to extend until the support bearing (801) lifts the main shaft (1) to the predetermined height. (c) After the main shaft (1) is lifted, the control module then controls the drive motor (30) in the circumferential rotation drive module to rotate clockwise, and drives the drive pinion (27) to rotate through the drive coupling (29). The drive pinion (27) meshes with the driven large gear (306) fixed on the outer arc surface of the bearing seat (3), thereby driving the bearing seat (3) to rotate circumferentially, so that the bearing (2) worn to the set wear threshold leaves the lower bearing position, and at the same time rotates the bearing (2) not worn to the set wear threshold to that position as the new lower bearing position bearing (2). (d) After the replacement of the bearing (2) worn to the set wear threshold is completed, the control module will control the support drive motor (12) in the main spindle support module to rotate counterclockwise, and drive the support drive threaded rod (11) to rotate through the support coupling (13). With the help of the threaded fit between the support drive threaded rod (11) and the support telescopic rod (8) and the guiding action of the guide boss (802) on the outer wall of the support telescopic rod (8) and the guide groove (901) on the inner wall of the support guide rod (9), the support telescopic rod (8) is driven to retract and the main spindle (1) is lowered. (e) After the main shaft (1) is lowered, the control module will control the limit drive motor (21) in the circumferential rotation limit module to rotate counterclockwise. Through the limit coupling (20), the limit drive threaded rod (19) will rotate. With the help of the threaded fit between the limit drive threaded rod (19) and the limit telescopic rod (17) and the guiding action of the guide boss (1701) on the outer wall of the limit telescopic rod (17) and the guide groove (1801) on the inner wall of the limit telescopic rod support seat (18), the limit telescopic rod (17) will be driven to extend, so that each "T" shaped limit block (16) is inserted into the corresponding "T" shaped limit groove, and the bearing (2) is replaced. (f) Once the newly replaced bearing (2) reaches the set wear threshold, repeat steps (a) to (e) to replace the bearing (2) until all bearings (2) reach the set wear threshold. Only then will maintenance personnel need to go up the tower to replace all bearings (2).

Images