Fan impeller turning system

Abstract

The invention provides a fan impeller turning system which is suitable for a wind generating set, the fan impeller turning system comprises a turning gear, the turning gear comprises a main body frame, a driving part, a main gear and a damping structure, the main body frame is used for being connected to the top of a tower, the main gear is rotatably connected to the main body frame, and the driving part is used for driving the main gear to rotate; the main gear is used for being connected with a rotor of a generator, and the driving piece is connected to the main body frame and can drive the main gear to rotate; the damping structure is used for providing damping torque for the main gear, the direction of the damping torque is opposite to the direction of torque provided by the driving part for the main gear, and the driving part is matched with the damping structure, so that the main gear can rotate stably, and the main gear can drive the rotor to rotate easily; and the main gear can be easily locked after rotating in place, so that the difficulty of rotating the hub is reduced, and the difficulty of mounting the blade of the wind driven generator is also reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a wind turbine impeller turning system. Background Art

[0002] As wind turbines become larger, the diameter of the wind turbine impeller also increases, which causes the load of the winch to increase dramatically when using the single-blade winch installation method. For example, the structure of a wind turbine is huge, and the blades of a wind turbine often weigh tens of tons. In order to drive these huge blades to rotate, the torque of the wind turbine gearbox, which is the output device, is very large. For another example, when assembling and disassembling the blades, it is necessary to drive the wind turbine gearbox to rotate so that the wind turbine gearbox can drive the wind turbine impeller to rotate, and then multiple blades can be installed on the wind turbine impeller. In this process, due to the large torque of the wind turbine gearbox, the conventional winch cannot drive the wind turbine gearbox to rotate, or even if it rotates, it cannot be locked in time after rotating into place, making it difficult to install the blades. Summary of the invention

[0003] The main purpose of the present disclosure is to provide a wind turbine impeller turning system to reduce the difficulty of turning the impeller of a wind turbine generator set.

[0004] In view of the above objectives, the present disclosure provides the following technical solutions:

[0005] One aspect of the present disclosure provides a wind turbine impeller turning system suitable for a wind turbine generator set, wherein the wind turbine impeller turning system includes a turning device, the turning device includes a main frame, a driving member, a main gear and a damping structure, the main frame is used to be connected to the top of a tower, the main gear is rotatably connected to the main frame, the main gear is used to be connected to the rotor of a generator, the driving member is connected to the main frame and can drive the main gear to rotate; the damping structure is used to provide a damping torque to the main gear, and the direction of the damping torque is opposite to the direction of the torque provided by the driving member to the main gear.

[0006] According to an exemplary embodiment of the present disclosure, the damping structure includes a first damping gear and a damping motor, the damping motor is connected to the main frame, the first damping gear is fixed on the driving shaft of the damping motor, the first damping gear is meshingly connected with the main gear, and the damping motor provides a damping torque to the main gear through the first damping gear.

[0007] Optionally, a driving gear is fixed on the output shaft of the driving member, the driving gear is meshed with the main gear, the first damping gear and the driving gear are symmetrically arranged relative to the main gear, and the damping motor and the driving member are both bidirectional motors.

[0008] Specifically, the damping structure includes a second damping gear and a balancing winch, the second damping gear is fixed to the driving shaft of the balancing winch, the second damping gear is meshingly connected with the main gear, and the balancing winch provides a damping torque to the main gear through the second damping gear.

[0009] Furthermore, the damping structure also includes a counterweight assembly and a twisted rope, one end of the twisted rope is connected to the counterweight assembly, and the other end of the twisted rope is connected to the balancing winch.

[0010] According to another exemplary embodiment of the present disclosure, the counterweight assembly includes a telescopic cylinder and a counterweight bracket, a cylinder body of the telescopic cylinder is connected to the counterweight bracket, and a telescopic rod of the telescopic cylinder is connected to the one end of the twisted rope.

[0011] Optionally, the counterweight assembly also includes a telescopic rod support and a movable pulley group, the telescopic rod support is movably arranged on the counterweight bracket, the telescopic rod is connected to the lower end surface of the telescopic rod support, and the movable pulley group is arranged above the telescopic rod support and connected to the telescopic rod support, so that the movable pulley group and the telescopic rod support move together relative to the counterweight bracket.

[0012] Specifically, the counterweight assembly also includes a cylinder support, which is movably connected to the counterweight bracket, the cylinder support is provided with a first stroke along the vertical direction of the counterweight bracket, and the telescopic rod support is provided with a second stroke along the vertical direction of the counterweight bracket, and the second stroke is greater than the first stroke.

[0013] Furthermore, the counterweight assembly also includes an elastic assembly, which is arranged below the cylinder support and parallel to the extension direction of the telescopic rod, and the elastic assembly is connected between the cylinder support and the counterweight bracket.

[0014] According to another exemplary embodiment of the present disclosure, the counterweight assembly is disposed below the balancing winch, and the counterweight assembly is used to be fixed to a wind turbine foundation.

[0015] Optionally, the fan impeller turning system also includes a brake arm, which is rotatably connected to the main frame, and a brake tooth capable of engaging with the main gear is provided on the side of the brake arm facing the main gear. The brake arm has a braking position and an unlocking position, and is used for when the fan impeller turning system fails, the brake arm is in the braking position and the brake tooth is engaged with the main gear teeth.

[0016] Specifically, the fan impeller turning system also includes a brake arm, which is rotatably connected to the main frame, and a brake tooth capable of engaging with the main gear is provided on the side of the brake arm facing the main gear. The brake arm has a braking position and an unlocking position, and is used for when the fan impeller turning system fails, the brake arm is located in the braking position and the brake tooth is engaged with the main gear teeth. The fan impeller turning system also includes a controller and a pressure sensor, and the pressure sensor is arranged on the output shaft of the damping motor and / or the output shaft of the driving member. When the monitoring value of the pressure sensor is greater than a predetermined value, the controller can control the brake driving member to drive the brake arm to be located in the braking position.

[0017] The wind turbine impeller turning system provided by the present invention has at least the following technical effects: the present invention enables the main gear to rotate smoothly through the cooperation of the driving member and the damping structure, so that the main gear can easily drive the rotor to rotate, and the main gear can also be easily locked after being rotated into place, thereby reducing the difficulty of rotating the hub, and also reducing the difficulty of installing the blades of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or other objects and advantages of the present disclosure will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A structural diagram from the first perspective of a fan impeller turning system provided by an exemplary embodiment of the present disclosure.

[0020] Figure 2 for Figure 1 The second perspective structural diagram of the fan impeller turning system.

[0021] Figure 3 for Figure 1 A partial enlarged view of the fan impeller turning system.

[0022] Figure 4 A structural diagram of a fan impeller turning system provided for another exemplary embodiment of the present disclosure.

[0023] Figure 5 for Figure 4 Structural diagram of the torque balancing device in .

[0024] Figure 6 for Figure 4 A partial enlarged view of the top structure of the fan impeller turning system.

[0025] Figure 7 for Figure 6 A partial enlarged view of the coordination between the center wheel device and the torque balancing device.

[0026] Figure 8for Figure 4 A partial enlarged view of the bottom structure of the fan impeller turning system.

[0027] Fig. 9 for Figure 8 A partial enlarged view of the torque balance component in the figure.

[0028] Description of reference numerals:

[0029] 1. Turning device; 2. Torque balancing device;

[0030] 3. Tower; 4. Wind turbine foundation;

[0031] 5. Rear frame; 6. Rotor;

[0032] 7. Housing; 8. Driving member;

[0033] 9. Driving gear; 11. Main frame;

[0034] 12. Main gear; 16. First damping gear;

[0035] 13. Second damping gear; 14. Transfer support;

[0036] 15. Damping motor; 17. Slewing support;

[0037] 18. Brake arm; 19. Brake drive member;

[0038] 20. Braking connecting shaft; 21. Balancing winch;

[0039] 22. Counterweight assembly; 23. Stranded rope;

[0040] 24. Guide wheel; 25. Transition gear;

[0041] 221. Counterweight bracket; 222. Movable pulley block;

[0042] 223. cylinder body; 224. telescopic rod;

[0043] 225. Cylinder support; 226. Telescopic rod support;

[0044] 227. Elastic component; 228. Pulley block. DETAILED DESCRIPTION

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be understood that the implementation of the present disclosure is limited to the embodiments set forth herein. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0046] Reference Figures 1 to 3In one aspect, the present disclosure provides a fan impeller turning system, which is suitable for a wind turbine generator set. The fan impeller turning system includes a turning device 1, which is used to be connected to a rotor 6 of a generator to drive the rotor 6 to rotate through the turning device 1, thereby driving the impeller to rotate.

[0047] Specifically, the winch device 1 includes a main frame 11, a driving member 8, a main gear 12 and a damping structure. The main frame 11 is used to be connected to the top of the tower to serve as the main support of the winch device 1, and the winch device 1 is connected to the top of the tower. The main gear 12 is rotatably connected to the main frame 11. The main gear 12 is used to be connected to the rotor 6 of the generator. The driving member 8 is connected to the main frame 11 and can drive the main gear 12 to rotate, so as to drive the rotor 6 to rotate with the main gear 12. In this embodiment, the main gear 12 is used to transmit the power on the driving member 8 to the rotor 6, and is mainly used to transmit power. The damping structure is used to provide a damping torque to the main gear 12. The direction of the damping torque is opposite to the direction of the torque provided by the driving member 8 to the main gear 12, balancing the torque during the rotation of the blades and reducing the load during the impeller winch process.

[0048] The present disclosure cooperates with the driving member 8 and the damping structure to enable the main gear 12 to rotate smoothly, so that the main gear 12 can easily drive the rotor 6 to rotate, and can also make the main gear 12 easy to lock after rotating into place, thereby reducing the difficulty of rotating the hub, and also reducing the difficulty of installing the blades of the wind turbine.

[0049] As an example, the driving member 8 may be a driving motor, which is the power source of the turning device 1. Specifically, a driving gear 9 is fixed to the output shaft of the driving member 8, and the driving gear 9 may be meshed and connected with the main gear 12, so that the driving gear 9 and the main gear 12 are arranged as a gear transmission, thereby avoiding accidental slipping of the main gear 12 and improving the reliability of the force transmission of the main gear 12.

[0050] Continuing to refer to the drawings, only one driving member 8 is shown in this embodiment, but it is not limited thereto. Multiple driving members 8 (not shown) can be arranged along the circumference of the main gear 12. The multiple driving members 8 can provide torque to the main gear 12 at the same time, so that the rotation of the main gear 12 is more stable. Furthermore, the main gear 12 is driven by multiple driving members 8. Such an arrangement can make the main gear 12 have a higher load-bearing capacity, so that it can adapt to the assembly of large-sized wind turbines.

[0051] Continue to refer to Figure 1 and Figure 2In this embodiment, the fan impeller turning system includes a transfer support 14 and a slewing support 17. The slewing support 17 is fixed to the radial inner side of the main gear 12. The transfer support 14 is arranged at one end of the slewing support 17, so that the transfer support 14 is connected to the main gear 12. For example, but not limited to, one end of the transfer support 14 can be connected to the slewing support 17 by fasteners or welding, and the other end of the transfer support 14 can be connected to the rotor 6 of the generator by a flange, but not limited to this. Optionally,

[0052] Reference Figure 4 The main frame 11 can be connected to the housing 7 of the generator, but is not limited thereto.

[0053] Continuing to refer to the drawings, the damping structure includes a first damping gear 16 and a damping motor 15. The damping motor 15 is connected to the main frame 11. The first damping gear 16 is fixed to the driving shaft of the damping motor 15. The first damping gear 16 is meshingly connected to the main gear 12. The damping motor 15 provides a damping torque to the main gear 12 through the first damping gear 16.

[0054] In this embodiment, the damping structure includes a first damping gear 16 meshing with the main gear 12. The first damping gear 16 is connected to the driving shaft of the damping motor 15. The power on the damping motor 15 is transmitted to the main gear 12 through the first damping gear 16, and then transmitted to the rotor 6. In this embodiment, the first damping gear 16 cooperates with the main gear 12 to avoid accidental slipping of the main gear 12, thereby improving the force transmission reliability of the main gear 12.

[0055] In order to further improve the stability of the rotation of the main gear 12 , the first damping gear 16 and the driving gear 9 are symmetrically arranged relative to the main gear 12 .

[0056] As an example, the damping motor 15 and the driving member 8 are both bidirectional motors, which improves the versatility of the fan impeller turning system. When the wheel hub needs to rotate in the clockwise direction, the driving member 8 can provide a clockwise torque to the main gear 12, and the damping motor 15 can provide a counterclockwise torque to the main gear 12. Conversely, when the wheel hub needs to rotate in the counterclockwise direction, the driving member 8 can provide a counterclockwise torque to the main gear 12, and the damping motor 15 can provide a clockwise torque to the main gear 12. In this embodiment, the direction in which the driving member 8 and the damping motor 15 provide the torque to the main gear 12 is selected according to needs, but is not limited thereto.

[0057] Reference Figure 3In order to further improve the reliability of the fan impeller turning system, the fan impeller turning system also includes a brake arm 18, which is rotatably connected to the main frame 11, and a brake tooth capable of engaging with the main gear 12 is provided on the side of the brake arm 18 facing the main gear 12. The brake arm 18 has a braking position and an unlocking position, which is used for the brake arm 18 to be in the braking position and the brake tooth to engage with the main gear 12 when the fan impeller turning system fails.

[0058] Specifically, the brake arm 18 is rotatably connected to the main frame 11 through the brake connecting shaft 20. When the hub needs to rotate, the fan impeller turning system can be used to drive the rotor 6 to rotate. At this time, the brake arm 18 can be in the unlocking position, and the brake teeth on the brake arm 18 are separated from the main gear 12, and the main gear 12 can rotate under the driving action of the driving member 8. When the hub needs to be locked, the brake arm 18 can be in the braking position. At this time, the brake teeth on the brake arm 18 are engaged with the main gear 12, and the brake arm 18 can prevent the main gear 12 from rotating, thereby achieving the locking of the main gear 12 and then the hub locking.

[0059] As an example, the fan impeller turning system in this embodiment further includes a brake driver 19, which can be a telescopic member, for example but not limited to, one end of the brake driver 19 is connected to the brake connecting shaft 20, and the other end is connected to the brake arm 18, so that the brake arm 18 is driven to swing in a direction away from the main gear 12 by the extension of the brake driver 19, so that the brake arm 18 is in an unlocked position. When the brake driver 19 is shortened, the brake driver 19 can drive the brake arm 18 to swing in the direction of the main gear 12, so that the brake arm 18 is in a braking position, and at this time, the brake teeth of the brake arm 18 can mesh with the main gear 12 to lock the main gear 12.

[0060] Furthermore, the fan impeller turning system also includes a controller and a pressure sensor (not shown in the figure), and the pressure sensor is arranged on the output shaft of the damping motor 15 and / or the output shaft of the driving member 8. When the monitoring value of the pressure sensor is greater than a predetermined value, the controller can control the brake driving member 19 to drive the brake arm 18 to be in the braking position.

[0061] As an example, the damping motor 15 controls the speed through the throttle valve. If the speed is too fast, the pressure of the damping motor 15 rises to a limited value, and the controller provides a signal to the driver 8 to control the driver 8 and reduce the pressure of the driver 8. When the pressure of the driver 8 increases sharply, the controller can control the brake driver 19 to shorten, and the brake arm 18 will swing around the brake connection shaft 20 and mesh with the main gear 12, so that the main gear 12 is locked, avoiding the failure of the fan impeller turning system, thereby improving the reliability of the fan impeller turning system.

[0062] Reference Figures 4 to 9In order to further improve the load capacity of the fan impeller turning system, the fan impeller turning system provided in this embodiment, the damping structure further includes a second damping gear 13 and a balancing winch 21, the second damping gear 13 is fixed to the driving shaft of the balancing winch 21, the second damping gear 13 is meshed and connected with the main gear 12, and the balancing winch 21 provides a damping torque to the main gear 12 through the second damping gear 13. In this embodiment, the balancing winch 21 is connected to the rear frame 5, but is not limited thereto.

[0063] Return to reference Figure 1 The fan impeller winch system also includes a transition gear 25, which is arranged between the second damping gear 13 and the main gear 12, and is meshed with the second damping gear 13 and the main gear 12 at the same time, so as to be able to transmit the torque of the balancing winch 21 to the main gear 12, but not limited to this. In this embodiment, the second damping gear 13 and the main gear 12 are indirectly meshed, but not limited to this. As needed, the second damping gear 13 can also be directly meshed with the main gear 12 (not shown).

[0064] Reference Figure 4 and Figure 6 In this embodiment, two balancing winches 21 are included, and the two balancing winches 21 are symmetrically arranged relative to the main gear 12, but this is not limited to the present invention.

[0065] Reference Figure 5 , the damping structure also includes a counterweight assembly and a rope 23, one end of the rope 23 is connected to the counterweight assembly, and the other end of the rope 23 is connected to the balancing winch 21. In this embodiment, the counterweight assembly can provide a damping torque to the balancing winch 21, and the damping torque can be transmitted to the main gear 12 through the balancing winch 21. As an example, in this embodiment, the fan impeller turning system also includes a guide wheel 24, and the rope 23 is wound around the guide wheel 24. The guide wheel 24 is rotatably connected to the top of the tower, for example but not limited to, the guide wheel 24 is rotatably connected to the rear frame 5, but not limited thereto. Optionally, the guide wheel 24 is arranged below the balancing winch 21, but not limited thereto.

[0066] Reference Figure 4 and Figure 8 The counterweight assembly is disposed below the balancing winch 21, and the counterweight assembly is used to be fixed on the wind turbine foundation 4, but is not limited thereto.

[0067] Furthermore, in this embodiment, the balancing winch 21, the counterweight assembly 22 and the winch rope 23 constitute a torque balancing device 2, and the main gear 12 is correspondingly provided with two torque balancing devices 2, and the two torque balancing devices 2 are symmetrically arranged relative to the main gear 12, but not limited to this.

[0068] Reference Fig. 9The counterweight assembly 22 includes a telescopic cylinder and a counterweight bracket 221, a cylinder body 223 of the telescopic cylinder is connected to the counterweight bracket 221, and a telescopic rod 224 of the telescopic cylinder is connected to one end of the winch 23. In this embodiment, the extension or retraction of the telescopic rod 224 relative to the cylinder body 223 can provide a damping torque to the balancing winch 21, and the damping torque can be transmitted to the main gear 12, but not limited thereto. As an example, the telescopic cylinder can be a hydraulic cylinder, but not limited thereto.

[0069] Continuing to refer to the accompanying drawings, the counterweight assembly 22 also includes a telescopic rod support 226 and a movable pulley group 222. The telescopic rod support 226 is movably arranged on the counterweight bracket 221, the telescopic rod 224 is connected to the lower end surface of the telescopic rod support 226, and the movable pulley group 222 is arranged above the telescopic rod support 226 and connected to the telescopic rod support 226, so that the movable pulley group 222 and the telescopic rod support 226 move together relative to the counterweight bracket 221.

[0070] In this embodiment, the movable pulley block 222 is connected to the telescopic rod 224 to move relative to the cylinder body 223 together with the telescopic rod 224, so as to provide a damping torque to the balancing winch 21, but the present invention is not limited thereto.

[0071] Furthermore, the counterweight assembly 22 further includes a pulley block 228, which is rotatably connected to the counterweight bracket 221, and the rope 23 is wound around the pulley block 228, so that the pulley block 228 is used to guide the rope 23, but the present invention is not limited thereto. Optionally, in this embodiment, the pulley block 228 is disposed above the movable pulley block 222, but the present invention is not limited thereto.

[0072] In this embodiment, the counterweight assembly also includes a cylinder support 225, which is movably connected to the counterweight bracket 221. The cylinder support 225 is provided with a first stroke along the vertical direction of the counterweight bracket 221, and the telescopic rod support 226 is provided with a second stroke along the vertical direction of the counterweight bracket 221, and the second stroke is greater than the first stroke.

[0073] It is understandable that the cylinder support 225 can be provided with a first stroke along the vertical direction of the counterweight bracket 221, and the first stroke facilitates the position adjustment of the telescopic cylinder, but is not limited thereto.

[0074] Furthermore, the counterweight assembly also includes an elastic assembly 227, which is disposed below the cylinder support 225 and parallel to the extension direction of the telescopic rod 224, and is connected between the cylinder support 225 and the counterweight bracket 221. When the fan impeller turning system fails, the elastic assembly 227 plays a role in buffering the load, thereby further improving the reliability of the fan impeller turning system.

[0075] During the wheel hub cranking process, the blade weight torque is transmitted to the high-speed stage end (rotor 6) with torque loss. During the blade attitude 0-90° process, the torque loss is borne by the fan impeller cranking system. During the blade attitude 90-120° process, the torque loss is borne by the blade weight torque.

[0076] The fan impeller turning system provided by the present disclosure, through the cooperation of the driving member 8 and the damping structure, makes it easy for the main gear 12 to drive the rotor to rotate, and is used to achieve the use of extremely small driving force to drive the large fan impeller turning. Furthermore, the fan impeller turning system provided by the present embodiment is not affected by the blade specifications, improves the versatility of the fan impeller turning system, and greatly reduces the tooling cost.

[0077] The fan impeller turning system provided by the present invention has a simple structure, compact equipment, convenient transportation, good economy and operability.

[0078] In the description of the present disclosure, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0079] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0080] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0081] The features, structures or characteristics described in the present disclosure may be combined in one or more embodiments in any suitable manner. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

Claims

1. A fan impeller turning system, It is characterized in that Applicable to a wind turbine generator set, the wind turbine impeller turning system comprises a turning device (1), and the turning device (1) comprises: The main frame (11) is used to be connected to the top of the tower. A driving member (8) and a main gear (12), wherein the main gear (12) is rotatably connected to the main frame (11), the main gear (12) is used to be connected to the rotor (6) of the generator, and the driving member (8) is connected to the main frame (11) and can drive the main gear (12) to rotate; The damping structure provides a damping torque to the main gear (12), wherein the direction of the damping torque is opposite to the direction of the torque provided by the driving member (8) to the main gear (12).

2. The fan impeller turning system according to claim 1, It is characterized in that The damping structure comprises a first damping gear (16) and a damping motor (15); the damping motor (15) is connected to the main frame (11); the first damping gear (16) is fixed to a driving shaft of the damping motor (15); the first damping gear (16) is meshingly connected to the main gear (12); and the damping motor (15) provides a damping torque to the main gear (12) via the first damping gear (16).

3. The fan impeller turning system according to claim 2, It is characterized in that A driving gear (9) is fixed on the output shaft of the driving member (8), and the driving gear (9) is meshed with the main gear (12). The first damping gear (16) and the driving gear (9) are symmetrically arranged relative to the main gear (12), and the damping motor (15) and the driving member (8) are both bidirectional motors.

4. The fan impeller turning system according to claim 1, It is characterized in that The damping structure comprises a second damping gear (13) and a balancing winch (21); the second damping gear (13) is fixed to a driving shaft of the balancing winch (21); the second damping gear (13) is meshingly connected with the main gear (12); and the balancing winch (21) provides a damping torque to the main gear (12) via the second damping gear (13).

5. The fan impeller turning system according to claim 4, It is characterized in that The damping structure further comprises a counterweight assembly and a twisted rope (23), one end of the twisted rope (23) is connected to the counterweight assembly, and the other end of the twisted rope (23) is connected to the balancing winch (21).

6. The fan impeller turning system according to claim 5, It is characterized in that The counterweight assembly comprises a telescopic cylinder and a counterweight bracket (221); a cylinder body of the telescopic cylinder is connected to the counterweight bracket (221); and a telescopic rod (224) of the telescopic cylinder is connected to the one end of the twisted rope (23).

7. The fan impeller turning system according to claim 6, It is characterized in that The counterweight assembly further comprises a telescopic rod support (226) and a movable pulley group (222); the telescopic rod support (226) is movably arranged on the counterweight bracket (221); the telescopic rod (224) is connected to the lower end surface of the telescopic rod support (226); the movable pulley group (222) is arranged above the telescopic rod support (226) and is connected to the telescopic rod support (226), so that the movable pulley group (222) and the telescopic rod support (226) move together relative to the counterweight bracket (221).

8. The fan impeller turning system according to claim 7, It is characterized in that The counterweight assembly further comprises a cylinder support (225), wherein the cylinder support (225) is movably connected to the counterweight bracket (221), wherein the cylinder support (225) is provided with a first stroke along the vertical direction of the counterweight bracket (221), and wherein the telescopic rod support (226) is provided with a second stroke along the vertical direction of the counterweight bracket (221), wherein the second stroke is greater than the first stroke.

9. The fan impeller turning system according to claim 8, It is characterized in that The counterweight assembly further comprises an elastic assembly (227), wherein the elastic assembly (227) is arranged below the cylinder support (225) and parallel to the extension direction of the telescopic rod (224), and the elastic assembly (227) is connected between the cylinder support (225) and the counterweight bracket (221).

10. The fan impeller turning system according to any one of claims 5 to 9, It is characterized in that The counterweight assembly is arranged below the balancing winch (21), and the counterweight assembly is used to be fixed on the wind turbine foundation (4).

11. The fan impeller turning system according to any one of claims 1 to 9, It is characterized in that The fan impeller turning system further comprises a brake arm (18), the brake arm (18) being rotatably connected to the main frame (11), and a brake tooth capable of meshing with the main gear (12) being arranged on a side of the brake arm (18) facing the main gear (12), the brake arm (18) having a braking position and an unlocking position, and being used for the brake arm (18) being located at the braking position and the brake tooth meshing with the teeth of the main gear (12) when the fan impeller turning system fails.

12. The fan impeller turning system according to claim 2 or 3, It is characterized in that The fan impeller turning system further comprises a brake arm (18), the brake arm (18) being rotatably connected to the main frame (11), and a brake tooth capable of meshing with the main gear (12) being arranged on a side of the brake arm (18) facing the main gear (12), the brake arm (18) having a braking position and an unlocking position, and being used for the brake arm (18) being located at the braking position and the brake tooth meshing with the teeth of the main gear (12) when the fan impeller turning system fails, The fan impeller turning system also includes a controller and a pressure sensor, wherein the pressure sensor is arranged on the output shaft of the damping motor (15) and / or the output shaft of the driving member (8). When the monitoring value of the pressure sensor is greater than a predetermined value, the controller can control the brake driving member (19) to drive the brake arm (18) to be located at the braking position.

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