A blade locking device for a wind turbine

Abstract

The present invention relates to the technical field of wind turbines, and discloses a blade locking device for wind turbines, including a mounting plate and an adjusting mechanism, one side of the mounting plate is fixedly connected with a fixed shaft, the outer side of the fixed shaft is provided with a locking gear for locking a pitch bearing, and one side of the mounting plate is fixedly connected with a flat key shaft. The present invention drives the locking gear to move through the adjusting mechanism, and when the locking gear moves to mesh with the inner gear ring of the pitch bearing, the guide gear locks the pitch axial direction, and when the locking gear is disengaged from the inner gear ring of the pitch bearing, the inner gear ring is released, and during the process of slowly rotating the blade, the guide gear drives the locking gear to rotate the rated angle, and the locking gear can still move axially to lock the pitch bearing with the guide gear, thereby locking the blade at different angles including the angle corresponding to the feathering position, which is convenient for the lifting and locking of the blade and the locking of the non-feathering position in daily maintenance operations.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generator sets, and in particular to a blade locking device for a wind turbine generator set. Background Art

[0002] A wind turbine is a power machine that converts wind energy into mechanical energy. The three blades of the wind turbine for absorbing wind energy are rotatably mounted on the hub through pitch bearings to form a wind wheel. According to changes in wind speed and direction, the unit can adjust the pitch drive to drive the pitch bearing to rotate, change the blade pitch angle, and put the blades of the wind turbine in a reliable feathering state to adjust the unit output. During the hoisting and installation of the wind wheel, the locking of the blades after feathering before strong convective weather, and the daily maintenance of the blades, the wind turbine blade locking device is required to lock the rotatable inner ring connecting the pitch bearing and the blade to ensure the safety of operation and use.

[0003] Usually, the locking device of a wind turbine set includes a locking pin driven by an electric push rod and a block with a locking hole corresponding to the locking pin. The locking pin is fixedly installed on one side of the hub, and the block is fixedly installed on the inner gear ring of the pitch bearing corresponding to the position where the blade needs to be locked. When in use, the blade rotates to the feathering position. At this time, the locking hole corresponds to the locking pin, and the electric push rod is extended to drive the locking pin to be embedded in the locking hole to limit the rotation of the inner gear ring of the pitch bearing relative to the outer ring, thereby completing the locking of the blade.

[0004] However, during the use of the existing wind turbine blade locking device, the block rotates with the inner gear ring of the variable pitch bearing, and the blade can only be locked in the rated feathering position. During the lifting process, it is difficult to adjust the angle or position of the blade according to the actual situation, and the locking pin and the locking hole need to be manually aligned, which increases the difficulty of the lifting operation. In addition, during daily shutdown maintenance, the blade is difficult to lock in the non-feathering position for inspection, repair or replacement, resulting in cumbersome maintenance operations. Summary of the invention

[0005] In view of the shortcomings of the existing wind turbine locking devices mentioned in the background technology during use, the present invention provides a blade locking device for a wind turbine, which has the advantages of locking at different angles, easy lifting and little wear on the inner gear ring of the pitch bearing, thereby solving the technical problems raised in the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a blade locking device for a wind turbine generator, comprising a mounting plate and an adjusting mechanism, wherein a fixed shaft is fixedly connected to one side of the mounting plate, a locking gear for locking a pitch bearing is arranged on the outer side of the fixed shaft, a flat key shaft is fixedly connected to one side of the mounting plate, a guide gear adapted to both the inner gear ring of the pitch bearing and the locking gear is arranged on the outer side of the flat key shaft, the locking gear can mesh with the inner gear ring of the pitch bearing and can be disengaged from the meshing with the inner gear ring of the pitch bearing, and the locking gear and the inner gear ring of the pitch bearing are both meshed with the guide gear;

[0007] The guide gear is used to cooperate with the locking gear to lock the pitch bearing, cooperate with the pitch bearing to adjust the angle of the locking gear and provide guidance for the axial movement of the locking gear. The adjustment mechanism can drive the locking gear and the guide gear to move axially, change the mutual meshing state of the locking gear and the inner gear ring of the pitch bearing, lock or loosen the inner gear ring of the pitch bearing, and adjust the meshing surface of the guide gear relative to the inner gear ring of the pitch bearing according to the locking and loosening state of the blade, change the position of the guide gear participating in the gear meshing when the blade is locked at different pitch angles, and reduce the meshing surface size of the guide gear with the inner gear ring of the pitch bearing during the blade rotation and pitch changing process.

[0008] Preferably, the adjustment mechanism includes a No. 1 sliding sleeve and a No. 2 sliding sleeve, the fixed shaft is slidingly connected to the No. 1 sliding sleeve, the No. 1 sliding sleeve is rotatably connected to the locking gear through a bearing, the No. 1 sliding sleeve is used to drive the locking gear to move axially without affecting the rotation of the locking gear, the flat key shaft is slidingly connected to the No. 2 sliding sleeve, the No. 2 sliding sleeve is rotatably connected to the guide gear through a rotating shaft, and the No. 2 sliding sleeve is used to drive the guide gear to move axially without affecting the rotation of the guide gear.

[0009] Preferably, the adjustment mechanism also includes an electromagnet and a permanent magnet, the electromagnet is fixedly arranged on one side of the mounting plate, the permanent magnet is fixedly arranged in the locking gear, and the electromagnet and the permanent magnet cooperate to provide magnetic force for the bidirectional movement of the locking gear.

[0010] Preferably, the electromagnet is connected to a DC circuit capable of changing the direction of current, the position of the electromagnet corresponds to the position of the permanent magnet, the number of the permanent magnets is set to be several and the several permanent magnets are evenly spaced and arranged in the locking gear.

[0011] Preferably, one end of the No. 1 sliding sleeve is fixedly connected to a convex plate, and a pushing mechanism is provided on one side of the convex plate. A spring for resetting the guide gear is movably sleeved on one end of the outer side of the flat key shaft. The pushing mechanism cooperates with the convex plate to drive the guide gear to move with the locking gear, and the size of the meshing surface of the guide gear is adjusted according to the locking and loosening status of the blade.

[0012] Preferably, the pushing mechanism comprises a top ring and a top rod, the convex plate is fixedly connected to the top ring, and the guide gear is fixedly connected to the top rod at an eccentric position in the radial direction of the guide gear.

[0013] Preferably, one end of the No. 2 sliding sleeve is fixedly connected to a connecting plate that cooperates with a spring, and the annular surface of the top ring that abuts the top rod is set as an inclined surface. The guide gear is rotated to make the top rod abut against different positions of the top ring surface, so that the kneading part of the guide gear and the inner gear ring of the pitch bearing is changed when the blade is pitched to different angles.

[0014] Preferably, the fixed shaft comprises a flat key portion and two threaded portions, the two threaded portions are respectively fixedly arranged at two ends of the flat key portion and the fixed shaft is made as one piece.

[0015] Preferably, a flat key for limiting the rotation of the No. 1 sliding sleeve is fixedly provided on the outer side of the flat key portion, and the flat key portion is slidably connected to the No. 1 sliding sleeve.

[0016] Preferably, the threaded portion is threadably sleeved with a threaded sleeve, and the threaded sleeve can drive the convex plate to move by rotating.

[0017] The present invention has the following beneficial effects:

[0018] The present invention uses the magnetic force between the electromagnet and the permanent magnet to push the locking gear to move, so that the locking gear and the inner gear ring of the pitch bearing are meshed with each other, and cooperate with the guide gear to limit the rotation of the inner gear ring of the pitch bearing to lock the blade of the wind turbine. Conversely, the locking gear is moved to be disengaged from the inner gear ring of the pitch bearing to release the blade. At this time, the guide gear and the inner gear ring of the pitch bearing are still meshed with each other, and the locking gear is only meshed with the guide gear. According to the needs of daily maintenance operations or adapting to wind force and direction, the blade pitch is slowly rotated to a rated angle, and the pitch bearing cooperates with the guide gear to drive the locking gear to rotate the rated angle. The locking gear can still be meshed with the inner gear ring of the pitch bearing through axial movement, so that the blade is locked at different angles including the angle corresponding to the feathering position, thereby improving the convenience of blade maintenance operations. During the impeller hoisting operation, the blade can be locked in the non-feathering position, thereby improving the convenience of the locking operation. When it is necessary to optimize the operating efficiency of the wind power station or to cope with specific meteorological conditions, the blade is conveniently locked in the non-feathering position, thereby improving the flexibility of the blade locking device.

[0019] The present invention drives the guide gear to rotate through the inner gear ring of the pitch bearing during the pitch changing process. When the blade is locked at different angles on the inner gear ring of the pitch bearing, the guide gear and the locking gear rotate at a rated angle to change the circumferential meshing surface, so that the entire gear surface can participate in the meshing locking, thereby increasing the area involved in wear without changing the meshing surface area during locking, thereby improving the service life of the locking device.

[0020] 3. The present invention drives the top ring to move by the convex plate, and cooperates with the push rod and the spring. When the blade is locked, the push rod is driven by the guide gear rotating during the pitch change process to rotate to abut against different parts of the inclined annular surface, thereby changing the part of the guide gear axially meshing with the inner gear ring of the pitch bearing, changing the wear surface that can participate in the meshing, increasing the area involved in wear, and further increasing the service life of the blade locking device. At the same time, when the blade is loosened, the convex plate cooperates with the top ring and the push rod to drive the guide gear to move axially without disengaging from the inner gear ring of the pitch bearing, thereby reducing the meshing area, thereby reducing the wear on the inner gear ring of the pitch bearing, and ensuring the reliability of the blade locking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the mounting plate of the present invention;

[0023] Figure 3 It is a schematic diagram of the meshing relationship of the gear set of the present invention;

[0024] Figure 4 It is a schematic cross-sectional view of the structure of the locking gear of the present invention;

[0025] Figure 5 It is a schematic cross-sectional view of the structure of the guide gear of the present invention.

[0026] In the figure: 1. mounting plate; 2. fixed shaft; 201. flat key portion; 202. threaded portion; 3. flat key shaft; 4. pitch bearing; 5. No. 1 sliding sleeve; 6. No. 2 sliding sleeve; 7. locking gear; 8. guide gear; 9. electromagnet; 10. permanent magnet; 11. connecting plate; 12. spring; 13. convex plate; 14. top ring; 15. push rod; 16. threaded sleeve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] For example, see Figure 1-Figure 3 and Figure 5 , a blade locking device for a wind turbine generator system, comprising a mounting plate 1, the mounting plate 1 is fixedly mounted on the hub web, and is used to provide fixed support for the entire device, see Figure 2A fixed shaft 2 is fixedly connected to one side of the mounting plate 1, and a sliding sleeve 5 is slidably sleeved on the shaft body of the fixed shaft 2 at the midpoint. The sliding sleeve 5 can only slide in the axial direction relative to the fixed shaft 2. Specifically, the fixed shaft 2 includes a flat key portion 201 and two threaded portions 202. The two threaded portions 202 are fixedly arranged at both ends of the flat key portion 201 and the fixed shaft 2 is made as one piece. A flat key for limiting the rotation of the sliding sleeve 5 is fixedly arranged on the outer side of the flat key portion 201. The flat key portion 201 is slidably sleeved with the sliding sleeve 5. One end of the outer side of the sliding sleeve 5 is rotatably connected with a locking gear 7 for locking the pitch bearing 4 through a bearing. The bearing is preferably a thrust bearing.

[0029] The locking gear 7 can mesh with the inner gear ring of the pitch bearing 4 and can be disengaged from the mutual meshing with the inner gear ring of the pitch bearing 4. A flat key shaft 3 is fixedly connected to one side of the mounting plate 1. A flat key is fixedly arranged on the outer side of the flat key shaft 3. A No. 2 sliding sleeve 6 is connected to the outer sliding sleeve of the flat key shaft 3. The outer side of the No. 2 sliding sleeve 6 is rotatably connected to a guide gear 8 that is compatible with the inner gear ring of the pitch bearing 4 and the locking gear 7 through a bearing. The bearing is preferably a thrust bearing. The guide gear 8 is used to cooperate with the locking gear 7 to lock the pitch bearing 4 and to cooperate with the pitch bearing 4 to adjust the locking gear The angle and of the wheel 7 provide guidance for the axial movement of the locking gear 7. The inner gear ring of the pitch bearing 4 and the locking gear 7 are meshed with the guide gear 8. An electromagnet 9 corresponding to the position of the locking gear 7 is fixedly provided on one side of the mounting plate 1. The electromagnet 9 is connected to a DC circuit that can change the direction of the current. A permanent magnet 10 cooperating with the electromagnet 9 is provided on one side of the locking gear 7. The number of the permanent magnets 10 is set to several and the several permanent magnets 10 are evenly arranged in the locking gear 7. The electromagnet 9 only acts with the permanent magnets 10 to generate magnetic force.

[0030] When the blades are locked during the lifting operation, the blades are in a non-rotating state, and when the blades are locked at different pitch angles, the blades are in a stopped state after the pitches have been changed to the corresponding positions. When the corresponding blades of the wind turbine need to be locked, the electromagnet 9 and the permanent magnet 10 are used to form a repulsive force, and the permanent magnet 10 drives the locking gear 7 to move axially under the guidance of the guide gear 8, so that the locking gear 7 is meshed with the guide gear 8 and then with the non-rotating inner gear ring of the pitch bearing 4. The locking gear 7, the guide gear 8 and the inner gear ring of the pitch bearing 4 are in a state of mutual meshing with each other, thereby limiting the rotation of each other and then locking the inner gear ring of the pitch bearing 4. The blade locking device is arranged on the hub, and the blade can be locked without rotating the blade to the feathering position when the entire impeller is lifted.

[0031] When it is necessary to remove the lock on the blade, an attraction is generated between the electromagnet 9 and the permanent magnet 10, so that the permanent magnet 10 drives the locking gear 7 to move axially under the guidance of the guide gear 8, so that the locking gear 7 is disengaged from the mutual meshing with the inner gear ring of the pitch bearing 4. At this time, the inner gear ring of the pitch bearing 4 and the guide gear 8 still keep mutual meshing, and the locking gear 7 only meshes with the guide gear 8, thereby releasing the lock on the blade, and the blade is pitched according to the needs of the wind turbine. The blade drives the inner gear ring of the pitch bearing 4 to rotate the rated angle, and the inner gear ring of the pitch bearing 4 drives the guide gear 8 to rotate the rated angle. After rotating the rated angle, the inner gear ring of the pitch bearing 4 and the guide gear 8 rotate the rated angle. The guide gear 8 can re-engage with each other through axial movement, so that when the blade is pitched and rotated to a non-feathered position according to wind speed and wind direction, and when blade maintenance operations are performed, the locking gear 7 can still be pushed by the magnetic force of the electromagnet 9 and the permanent magnet 10 to re-engage with the inner gear ring of the pitch bearing 4, so that the blades of the wind turbine are locked after the pitch is changed to different angles. When the blades are locked at different angles, the meshing surfaces between the locking gear 7 and the guide gear 8 and the inner gear ring of the pitch bearing 4 are different. The locking gear 7 and the guide gear 8 lock the inner gear ring of the pitch bearing 4 with different surfaces and mesh with each other, thereby increasing the wear surface area involved in the meshing and extending the service life of the blade locking device.

[0032] Example 2, see Figure 1 , Figure 2 , Figure 4 , Figure 5 On the basis of the first embodiment, one end of the No. 1 sliding sleeve 5 is fixedly connected with a convex plate 13, one side of the convex plate 13 is fixedly connected with a top ring 14, one side of the guide gear 8 is fixedly connected with a push rod 15 that cooperates with the top ring 14 to drive the guide gear 8 to move, one end of the outer side of the flat key shaft 3 is movably sleeved with a spring 12 for resetting the guide gear 8, one end of the No. 2 sliding sleeve 6 is fixedly connected with a connecting plate 11 that cooperates with the spring 12, the two ends of the spring 12 respectively abut against the mounting plate 1 and the connecting plate 11, the end of one end of the push rod 15 abuts against the annular surface of the top ring 14, and the acting force between the electromagnet 9 and the permanent magnet 10 is greater than the elastic force of the spring 12.

[0033] When the locking gear 7 is disengaged from the inner gear ring of the pitch bearing 4, the locking gear 7 drives the No. 1 sliding sleeve 5 to move, the No. 1 sliding sleeve 5 drives the convex plate 13 to move, the convex plate 13 drives the top ring 14 to move, and the top ring 14 pushes the push rod 15 to drive the guide gear 8 to move axially under the guidance of the inner gear ring of the pitch bearing 4, until the locking gear 7 is disengaged from the meshing with the inner gear ring of the pitch bearing 4. At this time, a part of the guide gear 8 is still meshed with the inner gear ring of the pitch bearing 4, so that when the blade performs a pitch operation, the meshing surface area of ​​the guide gear 8 and the slowly rotating inner gear ring of the pitch bearing 4 is reduced, thereby reducing the mutual wear of the guide gear 8 on the pitch bearing 4, and improving the reliability of the blade locking device.

[0034] Example 3, see Figure 1 , Figure 2 , Figure 4 , Figure 5 The annular surface of the top ring 14 is set as an inclined surface. When the blades of the wind turbine are pitched, the guide gear 8 rotates to drive the top rod 15 to rotate around the axis, so that the top rod 15 is pressed against different positions of the inclined annular surface of the top ring 14 under the action of the spring 12. After the pitch is changed and the blades are locked, the guide gear 8 has different bite surfaces with the inner gear ring of the pitch bearing 4 in the axial direction when the blades are pitched to different angles under the action of the spring 12, thereby increasing the area that can participate in wear without increasing the size of the contact surface of the guide gear 8 that should not be worn, thereby further increasing the service life of the guide gear 8.

[0035] Example 4, see Figure 1 , Figure 2 and Figure 4 On the basis of the third embodiment, the threaded portion 202 is threadedly sleeved with a threaded sleeve 16, and one of the two threaded sleeves 16 is located on one side of the convex plate 13. The threaded sleeve 16 is rotated to push the convex plate 13 to move, and the maximum distance of the convex plate 13 away from the mounting plate 1 in the axial direction is changed, so that the axial length of the meshing portion of the locking gear 7 and the guide gear 8 is manually adjusted according to the need of meshing, and a means of forced movement of the locking gear 7 is provided. Specifically, the threaded sleeve 16 is rotated to push the convex plate 13 or the No. 1 sliding sleeve 5 to move axially, thereby driving the locking gear 7 to re-engage with the inner gear ring of the pitch bearing 4 or disengage from the mutual meshing with the inner gear ring of the pitch bearing 4. Preferably, the threaded sleeve 16 is set as a hexagonal nut to ensure the reliability of the use of the blade locking device.

[0036] The method of use (working principle) of the present invention is as follows:

[0037] The mounting plate 1 is fixedly mounted on the hub at a position corresponding to the inner gear ring of the pitch bearing 4. The electromagnet 9 acts on the permanent magnet 10, so that the permanent magnet 10 overcomes the elastic force of the spring 12 and drives the locking gear 7 to move axially under the guidance of the guide gear 8. The locking gear 7 moves to engage with the inner gear ring of the pitch bearing 4 in a non-rotating state, and cooperates with the guide gear 8 to lock the pitch bearing 4 to complete the locking of the blade. When the impeller is hoisted, the blade can be locked in the non-feathering position of the blade, which is convenient for hoisting. In addition, the permanent magnet 10 cooperates with the electromagnet 9 to disengage the locking gear 7 from the meshing with the inner gear ring of the pitch bearing 4, and loosen the inner gear ring of the pitch bearing 4.

[0038] When the blades adjust the angle of the blades according to the needs of maintenance operations or to adapt to the wind force and direction, the inner gear ring of the pitch bearing 4 rotates to the rated angle and cooperates with the guide gear 8 to drive the locking gear 7 to rotate to the rated angle. After the pitch is changed, the locking gear 7 can move axially to re-engage with the inner gear ring of the pitch bearing 4, thereby locking the blades at different positions including the feathering position, improving the convenience of maintenance operations and facilitating locking the blades at different angles to adapt to the wind force and direction. When the blades at different positions are locked, the engaging surfaces of the locking gear 7 and the guide gear 8 change with the rotation, increasing the wear area that can participate in the wear and improving the service life. When the inner gear ring of the pitch bearing 4 is loosened, the convex plate 13 cooperates with the top ring 14 and the top rod 15 to drive the guide gear 8 to move axially without disengaging from the mutual engagement with the inner gear ring of the pitch bearing 4 to reduce the meshing area, reduce wear, and further improve the service life.

Claims

1. A blade locking device for a wind turbine generator system, comprising a mounting plate (1) and an adjustment mechanism, characterized in that: A fixed shaft (2) is fixedly connected to one side of the mounting plate (1), a locking gear (7) for locking the pitch bearing (4) is arranged on the outer side of the fixed shaft (2), a flat key shaft (3) is fixedly connected to one side of the mounting plate (1), a guide gear (8) adapted to the inner gear ring of the pitch bearing (4) and the locking gear (7) is arranged on the outer side of the flat key shaft (3), the locking gear (7) can mesh with the inner gear ring of the pitch bearing (4) and can be disengaged from the inner gear ring of the pitch bearing (4), and the locking gear (7) and the inner gear ring of the pitch bearing (4) are both meshed with the guide gear (8); The guide gear (8) is used to cooperate with the locking gear (7) to lock the pitch bearing (4), cooperate with the pitch bearing (4) to adjust the angle of the locking gear (7) and provide guidance for the axial movement of the locking gear (7); the adjustment mechanism can drive the locking gear (7) and the guide gear (8) to move axially, change the mutual meshing state of the locking gear (7) and the inner gear ring of the pitch bearing (4), lock or loosen the inner gear ring of the pitch bearing (4), adjust the meshing surface of the guide gear (8) and the inner gear ring of the pitch bearing (4) according to the locking and loosening state of the blade, change the meshing position of the guide gear (8) when the blade is locked at different pitch angles, and reduce the meshing surface size of the guide gear (8) and the inner gear ring of the pitch bearing (4) during the blade rotation and pitch changing process; The adjustment mechanism comprises a first sliding sleeve (5) and a second sliding sleeve (6), the fixed shaft (2) is slidably connected to the first sliding sleeve (5), the first sliding sleeve (5) is rotationally connected to the locking gear (7) via a bearing, the first sliding sleeve (5) is used to drive the locking gear (7) to move axially without affecting the rotation of the locking gear (7), the flat key shaft (3) is slidably connected to the second sliding sleeve (6), the second sliding sleeve (6) is rotationally connected to the guide gear (8) via a rotating shaft, and the second sliding sleeve (6) is used to drive the guide gear (8) to move axially without affecting the rotation of the guide gear (8); The adjustment mechanism further comprises an electromagnet (9) and a permanent magnet (10), wherein the electromagnet (9) is fixedly arranged on one side of the mounting plate (1), and the permanent magnet (10) is fixedly arranged in the locking gear (7), and the electromagnet (9) and the permanent magnet (10) cooperate to provide magnetic force for the bidirectional movement of the locking gear (7); One end of the first sliding sleeve (5) is fixedly connected to a convex plate (13), one side of the convex plate (13) is provided with a pushing mechanism, one end of the outer side of the flat key shaft (3) is movably sleeved with a spring (12) for resetting the guide gear (8), the pushing mechanism cooperates with the convex plate (13) to drive the guide gear (8) to move following the locking gear (7), and the size of the meshing surface of the guide gear (8) is adjusted according to the locking and loosening state of the blade; The pushing mechanism comprises a top ring (14) and a top rod (15); the convex plate (13) is fixedly connected to the top ring (14); and the guide gear (8) is fixedly connected to the top rod (15) at an eccentric position in the radial direction of the guide gear (8).

2. A blade locking device for a wind turbine according to claim 1, characterized in that: The electromagnet (9) is connected to a DC circuit capable of changing the direction of current, the position of the electromagnet (9) corresponds to the position of the permanent magnet (10), the number of the permanent magnets (10) is set to be a plurality and the plurality of permanent magnets (10) are evenly spaced and arranged in the locking gear (7).

3. The blade locking device for a wind turbine according to claim 1, characterized in that: One end of the second sliding sleeve (6) is fixedly connected to a connecting plate (11) that cooperates with a spring (12); the annular surface of the top ring (14) that contacts the top rod (15) is arranged as an inclined surface; the guide gear (8) rotates so that the top rod (15) contacts different positions of the top ring (14) surface, and changes the meshing portion of the guide gear (8) and the inner gear ring of the pitch bearing (4) when the blade is pitched to different angles.

4. The blade locking device for a wind turbine according to claim 1, characterized in that: The fixed shaft (2) comprises a flat key portion (201) and two threaded portions (202); the two threaded portions (202) are respectively fixedly arranged at two ends of the flat key portion (201); and the fixed shaft (2) is manufactured as one piece.

5. A blade locking device for a wind turbine according to claim 4, characterized in that: A flat key for limiting the rotation of the first sliding sleeve (5) is fixedly arranged on the outer side of the flat key portion (201), and the flat key portion (201) is slidably sleeved with the first sliding sleeve (5).

6. A blade locking device for a wind turbine according to claim 4, characterized in that: The threaded portion (202) is threadably sleeved with a threaded sleeve (16), and the threaded sleeve (16) can drive the convex plate (13) to move by rotating.

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