Wind generating set hub blade locking device, control method thereof and impeller system

Abstract

The invention relates to a wind generating set variable pitch system, and discloses a wind generating set hub blade locking device which comprises a fixed bottom plate (1), a sliding block (2) and a driving device (4), a containing cavity (201) is formed in the end, away from the driving device (4), of the sliding block (2), and a plurality of locking pins (3) arranged side by side are arranged in the containing cavity (201). An elastic connecting structure (7) is arranged between each locking pin (3) and the bottom face of the containing cavity (201), and the driving device (4) can drive the sliding block (2) to slide so that the locking pins (3) can be attached to the tooth face of the variable pitch bearing (5), and then the blades of the wind generating set can be locked. In addition, the invention further discloses a control method of the hub blade locking device of the wind generating set and an impeller system of the wind generating set. The hub blade locking device of the wind generating set is simple in structure, convenient to operate and good in using effect.

Description

Technical Field

[0001] The present invention relates to a wind turbine generator set pitch control system, and in particular to a wind turbine generator set hub blade locking device, a control method for the wind turbine generator set hub blade locking device and a wind turbine generator set impeller system. Background Art

[0002] The locking mechanism of the blades plays a vital role in the operation and maintenance of wind turbines. With the continuous development of wind power generation technology, the size and load-bearing capacity of wind turbine blades are also increasing, which puts higher requirements on the safety and reliability of the variable pitch system. Traditional blade locking devices mainly rely on manual operation. The biggest problem with this locking device is the safety risks and low efficiency. However, before entering the impeller, the staff must lock the blades, which not only increases the complexity of the operation, but also may lead to accidents.

[0003] The blade locking devices in the prior art usually have the disadvantages of poor versatility, complex structure, large space occupation, etc., and are prone to cause wear on the tooth surface of the pitch bearing during use, affecting the normal operation of the pitch system.

[0004] In view of this, it is necessary to provide a wind turbine hub blade locking device to solve or overcome the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the first aspect of the present invention is to provide a wind turbine hub blade locking device, which can lock variable pitch bearings of different sizes through a slider that can move forward and backward and a plurality of locking pins that can adjust the extension length forward and backward. It has a simple structure, strong versatility, good locking effect and high safety performance.

[0006] The technical problem to be solved by the second aspect of the present invention is to provide a control method for a wind turbine hub blade locking device, which can control the wind turbine hub blade locking device to lock and unlock the variable pitch bearing, is easy to operate, and has good use effect.

[0007] The technical problem to be solved by the third aspect of the present invention is to provide a wind turbine impeller system, in which the wind turbine hub blade locking device can lock variable pitch bearings of different sizes, has a simple structure, strong versatility, good locking effect and high safety performance.

[0008] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0009] A wind turbine hub blade locking device comprises a fixed base plate, a slider slidably connected to the fixed base plate, and a driving device connected to the slider, wherein an accommodating cavity is provided at one end of the slider away from the driving device, wherein a plurality of locking pins arranged in parallel are provided in the accommodating cavity, and an elastic connecting structure is provided between each of the locking pins and the bottom surface of the accommodating cavity, and the driving device can drive the slider to slide so that the locking pins can fit the tooth surface of a pitch bearing, thereby locking the wind turbine blade.

[0010] Preferably, in the initial state, the distance between the front end edge of the locking pin and the tooth surface of the tooth root of the pitch bearing is smaller than the stroke of the drive device, and the distance that the locking pin can be compressed backwards is at least greater than half of the stroke of the drive device.

[0011] Preferably, a sliding guide rail is provided on the fixed bottom plate, and a sliding groove is correspondingly provided on the sliding block. The cross section of the sliding guide rail is trapezoidal, and the surface connected to the fixed bottom plate is smaller than the other opposite surface.

[0012] Preferably, the locking pin is formed into a strip-shaped structure, and the opposite side surfaces of the end portion thereof are formed into tooth surfaces.

[0013] Preferably, the elastic connection structure includes a central connecting rod and an elastic member sleeved on the central connecting rod, one end of the elastic member is connected to the slider, and the other end is connected to the bottom surface of the accommodating cavity, one end of the central connecting rod is fixedly connected to the end of the locking pin, and the other end is movably connected to the slider.

[0014] Preferably, the driving device is a hydraulic driving device, an electric driving device or a starting driving device.

[0015] Preferably, it also includes a sensor control device and a control system, wherein the sensor control device includes an infrared sensor, a signal processor and an electric hydraulic controller, the sensor control device is arranged on the side of the driving device and close to the end face of the connecting end between the slider and the driving device, and the control system is signal-connected to the sensor control device and the driving device.

[0016] A control method for a wind turbine hub blade locking device, applied to the wind turbine hub blade locking device described in any one of the above technical solutions, comprises the following steps:

[0017] Step S01: When the variable pitch bearing needs to be locked, the control system receives a manual command or an automatic command, controls the driving device to drive the slider to move forward until the locking pin is against the tooth surface of the variable pitch bearing, and the sensing control device monitors the distance the slider moves forward. The control system controls the driving device according to the moving distance to lock the variable pitch bearing.

[0018] Step S02, when the variable pitch bearing is released, the control system receives a manual command or an automatic command, controls the driving device to drive the slider to move backward, and when the sensing control device monitors the position of the slider moving backward to the initial position, sends a signal to the control system, and the driving device stops working.

[0019] Preferably, in step S01, the variable pitch bearing stops rotating, the locking pin abuts against the tooth surface of the variable pitch bearing, and the control system controls the driving device to stop working after receiving the signal.

[0020] A wind turbine impeller system comprises a wind turbine hub blade locking device according to any one of the above technical solutions.

[0021] Through the above technical scheme, the hub blade locking device of the wind turbine generator set of the present invention includes a fixed base plate, a slider slidably connected to the fixed base plate, and a driving device connected to the slider, the slider is provided with a receiving cavity at one end away from the driving device, a plurality of locking pins arranged in parallel are provided in the receiving cavity, and an elastic connection structure is provided between each of the locking pins and the bottom surface of the receiving cavity, and the driving device can drive the slider to slide so that the locking pin can fit the tooth surface of the variable pitch bearing, thereby locking the blades of the wind turbine generator set. In the hub blade locking device of the wind turbine generator set of the present invention, the driving device can drive the slider to move back and forth, and a plurality of locking pins are automatically inserted between the two teeth of the variable pitch bearing, so that the variable pitch bearing can be locked at any position, the structure is simple, the safety performance is high, and it is not easy to cause the tooth surface of the variable pitch bearing to wear, and the use effect is good.

[0022] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a specific embodiment of the wind turbine hub blade locking device of the present invention;

[0024] Figure 2 It is a structural schematic diagram of a specific embodiment of the slider, locking pin and elastic connection structure of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a specific embodiment of the wind turbine hub blade locking device and the variable pitch bearing according to the present invention;

[0026] Figure 4 It is a step diagram of a specific embodiment of the control method of the wind turbine hub blade locking device of the present invention.

[0027] Description of Reference Numerals

[0028] 1Fixed base plate 101Mounting hole

[0029] 2 Slider 201 Accommodating Cavity

[0030] 3 Locking pin 4 Driving device

[0031] 5 Pitch bearing 6 Sensor control device

[0032] 7 Elastic connection structure 701 Central connecting rod

[0033] 702 elastic member 8 sliding guide DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 direct connection, or an indirect connection 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 invention can be understood according to specific circumstances.

[0036] In addition, 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 technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0037] like Figure 1 and Figure 2 As shown, the present invention provides a wind turbine hub blade locking device, comprising a fixed base plate 1, a slider 2 slidably connected to the fixed base plate 1, and a driving device 4 connected to the slider 2, an accommodating cavity 201 is provided at one end of the slider 2 away from the driving device 4, a plurality of locking pins 3 arranged in parallel are provided in the accommodating cavity 201, an elastic connecting structure 7 is provided between each locking pin 3 and the bottom surface of the accommodating cavity 201, the driving device 4 can drive the slider 2 to slide, so that the locking pin 3 can fit the tooth surface of the pitch bearing 5, thereby locking the wind turbine blade.

[0038] In the present invention, a plurality of mounting holes 101 are provided on the fixed base plate 1, so that the fixed base plate 1 can be detachably connected to the hub web mounting boss by fasteners such as screws and bolts, and the height of the locking device and the distance between the variable pitch bearing 5 and the hub web mounting boss can be adjusted. A single-sided boss is provided at the end of the fixed base plate 1 for connecting with the drive device 4. The telescopic end of the drive device 4 is connected to the slider 2, so that the slider 2 can be reciprocated along the sliding guide rail 8. The end of the slider 2 away from the drive device 4 can also be considered as the front end of the hub blade locking device of the wind turbine generator set of the present invention. The front end of the slider 2 is provided with a receiving cavity 201, and the receiving cavity 201 is formed as a rectangular frame. A plurality of locking pins 3 and a plurality of elastic connection structures 7 are arranged in the receiving cavity 201. Each locking pin 3 is arranged in a one-to-one correspondence with each elastic connection structure 7. Therefore, when the variable pitch bearing 5 needs to be locked, the control driving device 4 can push the slider 2 forward and slowly approach the variable pitch bearing 5. In the process of slowly approaching, the front ends of the multiple locking pins 3 also begin to slowly insert into the gap between the tooth surfaces of the variable pitch bearing 5, and abut against the tooth surfaces of the variable pitch bearing 5, thereby achieving the locking of the variable pitch bearing 5. When the front end side of the locking pin 3 abuts against the tooth surface of the variable pitch bearing 5, the elastic connection structure 7 at the rear end gradually shrinks, and the front end side of the locking pin 3 and the tooth surface of the variable pitch bearing 5 will not be displaced, causing wear on the tooth surface of the variable pitch bearing 5. In addition, it can be imagined that in the process of gradual compression of the elastic connection structure 7, the locking pin 3 is also subjected to the forward thrust of the elastic connection structure 7, thereby effectively ensuring the safety performance of the locking and ensuring its use effect.

[0039] It should be noted that, in the initial state, the front end of each locking pin 3 exceeds the front end surface of the accommodating cavity 201 .

[0040] In addition, it should be noted that the pitch of the pitch bearing 5 is an integral multiple of the locking pin 3. Therefore, the width of the locking pin 3 needs to be designed according to the pitch of the pitch bearing 5. Figure 3 It can be seen that the number and depth of the locking pins 3 at different positions inserted into the tooth roots of the two pitch bearings 5 ​​are different according to the actual position and angle. Therefore, the tooth root spacing of the pitch bearing 5 is only a basis for designing the width of the locking pin 3, but not the only basis.

[0041] from Figure 2 As can be seen in the figure, the locking pin 3 is formed into a rectangular strip structure, and the two opposite side surfaces of the front end thereof are formed into curved surfaces. Preferably, the two opposite side surfaces of the front end of the locking pin 3 are designed as tooth surfaces.

[0042] As a preferred embodiment of the present invention, in the initial state, the distance between the front end edge of the locking pin 3 and the tooth surface of the tooth root of the pitch bearing 5 is smaller than the stroke of the driving device 4, and the distance that the locking pin 3 can be compressed backward is at least greater than half of the stroke of the driving device 4.

[0043] In a specific embodiment of the present invention, in the initial state, the front edge of the locking pin 3 is at a certain distance from the pitch bearing 5, and this distance is not set arbitrarily. Specifically, the distance between the front edge of the locking pin 3 and the tooth surface of the root of the pitch bearing 5 is less than the stroke of the drive device 4. When the front edge of one of the locking pins 3 abuts against the tooth surface of the root of the pitch bearing 5, the other multiple locking pins 3 may not abut against the tooth surface of the root of the pitch bearing 5. Therefore, part of the locking pins 3 moves backward under the action of the elastic connection structure 7. There are also requirements for the moving distance, which must be at least greater than half of the stroke of the drive device 4. In this way, the locking pin 3 can abut against the teeth of multiple pitch bearings 5, effectively increasing the safety of locking.

[0044] As a preferred embodiment of the present invention, a sliding guide rail 8 is provided on the fixed base plate 1, and a sliding groove is correspondingly provided on the slider 2, which can fix the slider 2 and limit the movement of the slider 2 to linear reciprocating motion along the sliding guide rail 8.

[0045] In a specific embodiment of the present invention, a sliding guide rail 8 is provided on the fixed base plate 1, and a sliding groove is correspondingly provided on the sliding block 2, and the sliding guide rail 8 can be inserted into the sliding groove.

[0046] In a specific embodiment of the present invention, a sliding guide rail may be provided on the slider 2 , and a sliding groove may be provided on the fixed base plate 1 .

[0047] In a specific embodiment of the present invention, a linear guide rail may also be used, and the linear guide rail is connected to the slider 2 and the fixed base plate 1 respectively.

[0048] As a preferred embodiment of the present invention, the cross section of the sliding guide rail 8 is trapezoidal, and the surface connected to the fixed base plate 1 is smaller than the other opposite surface.

[0049] In a preferred embodiment of the present invention, the upper end surface of the sliding guide rail 8 is larger than the lower end surface, so that the cross-section of the sliding guide rail 8 forms an inverted trapezoidal structure, thereby being able to connect the slider 2 while also directly limiting the displacement of the slider 2 in the up and down directions.

[0050] As a preferred embodiment of the present invention, the locking pin 3 is formed into a strip structure with a rectangular or square cross section, and the opposite side surfaces of the end thereof are formed into tooth surfaces.

[0051] As a preferred embodiment of the present invention, the elastic connection structure 7 includes a central connecting rod 701 and an elastic member 702 sleeved on the central connecting rod 701, one end of the elastic member 702 is connected to the locking pin 3, and the other end is connected to the bottom surface of the accommodating cavity 201.

[0052] In a specific embodiment of the present invention, one end of the elastic member 702 is connected to the locking pin 3, and the other end is connected to the bottom surface of the accommodating cavity 201, which only limits the elastic member 702. If the gap between the elastic member 702 and the central connecting rod 701 is small, the elastic member 702 will not shake when it is sleeved on the central connecting rod 701, and the connection of the two ends of the elastic member 702 may not be limited.

[0053] As a preferred embodiment of the present invention, one end of the central connecting rod 701 is fixedly connected to the end of the locking pin 3 , and the other end is movably connected to the slider 2 .

[0054] In a specific embodiment of the present invention, a circular hole is provided at the bottom of the accommodating cavity 201, and the central connecting rod 701 is inserted into the circular hole. Alternatively, a through hole is provided at the bottom of the accommodating cavity 201, and after the central connecting rod 701 passes through the through hole, a limiting structure (such as a shaft elastic retaining ring) is used to limit the central connecting rod 701, so that the installation and use of the central connecting rod 701 can be achieved.

[0055] As a preferred embodiment of the present invention, the elastic member 702 is a compression spring or a rubber tube.

[0056] In a specific embodiment of the present invention, the elastic member 702 is preferably a compression spring.

[0057] As a preferred embodiment of the present invention, the driving device 4 is a hydraulic driving device, an electric driving device or a starting driving device.

[0058] As a specific embodiment of the present invention, the driving device 4 is preferably a hydraulic driving device. The hydraulic driving device is an industrial standard hydraulic device, and a control module controls its movement. The size parameters meet the design and installation requirements. The push and pull force can meet the requirements of the forward advancement and backward retraction of the locking pin 3. The electrical parameters meet the requirements of the input interface of the pitch system, and are independently controlled by the hydraulic driving device.

[0059] As a preferred embodiment of the present invention, the hub blade locking device of the wind turbine generator set of the present invention also includes a sensing control device 6 and a control system, wherein the sensing control device 6 includes an infrared sensor, a signal processor and an electric hydraulic controller, and the sensing control device 6 is arranged on the side of the driving device 4 and close to the end face of the connection end between the slider 2 and the driving device 4.

[0060] In a specific embodiment of the present invention, the sensor control device 6 includes an infrared sensor, a signal processor and an electro-hydraulic controller. The infrared sensor detects the position distance information of the slide block 2 to prevent damage to the machine caused by excessive displacement, and feeds the position distance information back to the signal processor, which controls the advance and retreat. The signal processor can determine the locking state, receive remote locking or release instructions, control the electro-hydraulic device to move, and complete locking or release.

[0061] As an optimal embodiment of the wind turbine hub blade locking device of the present invention, it includes a fixed base plate 1, a slider 2, a locking pin 3, a drive device 4, a sensor control device 6 and an elastic connection structure 7. Among them, the fixed base plate 1 is provided with a sliding guide rail 8 and a plurality of mounting holes 101, and the fixed base plate 1 is detachably connected to the hub web mounting boss by fasteners such as screws and bolts. The slider 2 is provided with a slide groove, the sliding guide rail 8 is connected to the slide groove, and the slider 2 can move along the sliding guide rail 8. The locking pin 3 is formed into a rectangular strip structure, and the opposite side surfaces of the front end thereof are formed into tooth surfaces. The drive device 4 is fixedly connected to the fixed base plate 1, and the movable end of the drive device 4 is connected to the slider 2. The elastic connection structure 7 includes a central connecting rod 701 and an elastic member 702 sleeved on the central connecting rod 701. The front end of the slider 2 is provided with a housing cavity 201, which is formed as a rectangular frame. A through hole is provided at the bottom of the housing cavity 201. After the central connecting rod 701 passes through the through hole, it is limited by a limiting structure (such as an elastic retaining ring for the shaft). Multiple locking pins 3 and multiple elastic connecting structures 7 are arranged in the housing cavity 201, and each locking pin 3 is arranged in a one-to-one correspondence with each elastic connecting structure 7. The sensor control device 6 is arranged on the side of the driving device 4 and close to the end face of the connecting end of the slider 2 and the driving device 4. The sensor control device 6 is preferably a displacement sensor. The upper end face of the sliding guide rail 8 is larger than the lower end face, that is, the cross section of the sliding guide rail 8 is a trapezoid.

[0062] Based on the above optimal embodiment, it can be seen that the process of locking the blades of a wind turbine generator set using the wind turbine generator set hub blade locking device of the present invention is as follows:

[0063] A locking command is issued through the pitch control system or through a manual switch, and the driving device 4 pushes the slider 2 forward, pushing the locking pin 3 toward the inner gear ring of the pitch bearing 5, so that the front end of the locking pin 3 is tightly fitted with the tooth surface of the pitch bearing 5. The sensor control device 6 can determine whether the locking position is appropriate, and the locking is completed if the state is correct.

[0064] The blade release operation process is as follows:

[0065] When it is confirmed that the lock needs to be released, a blade release command is issued, and the drive device 4 controls the slider 2 to move backward and retract the slider 2. The sensor control device 6 determines whether the slider 2 has returned to its original position and completes the unlocking. When the slider 2 returns to the unlocked position, the contact with the pitch bearing 5 is released. Finally, the operator should check whether the blade has been successfully unlocked and ensure that it can rotate freely.

[0066] In summary, the present invention can achieve the following three important effects:

[0067] First, the wind turbine hub blade locking device of the present invention is provided with a sensor control device 6, which can realize remote automatic control when the driving device 4 controls the slider 2 to move forward to lock the blade or move backward to unlock the blade. It can also ensure that the blades can be completely locked during maintenance, inspection and shutdown, and the locking pin 3 can be within a safe range after unlocking, and will not cause wrong insertion and other operations to the normal operation of the variable pitch bearing 5.

[0068] Second, the two opposite side surfaces at the front end of the locking pin 3 are formed as tooth surfaces, which better fit the tooth surfaces of the pitch bearing 5 and cause less wear on the tooth surfaces of the pitch bearing 5 .

[0069] Third, the special structural form of the elastic connection structure 7 is connected to the rear end of the locking pin 3. During the locking process, when the front end side of the locking pin 3 is against the tooth surface of the pitch bearing 5, the elastic connection structure 7 at the rear end gradually shrinks, and does not cause the front end side of the locking pin 3 and the tooth surface of the pitch bearing 5 to be displaced, thereby causing wear on the tooth surface of the pitch bearing 5. In addition, during the gradual compression of the elastic connection structure 7, the locking pin 3 is also pushed forward by the elastic connection structure 7, thereby effectively ensuring the safety performance of the locking and ensuring its use effect. It can be imagined that the wind turbine hub blade locking device of the present invention has higher reliability and stability, simpler structure, and effectively reduces maintenance costs.

[0070] like Figure 4 As shown, the present invention provides a control method for a wind turbine hub blade locking device, which is applied to a wind turbine hub blade locking device in any one of the above technical solutions, and comprises the following steps:

[0071] Step S01, when the variable pitch bearing 5 needs to be locked, the control system receives a manual command or an automatic command, controls the drive device 4 to drive the slider 2 to move forward until the locking pin 3 is against the tooth surface of the variable pitch bearing 5, and the sensor control device 6 monitors the distance the slider 2 moves forward.

[0072] Step S02, when the variable pitch bearing 5 is released, the control system receives a manual command or an automatic command, controls the driving device 4 to drive the slider 2 to move backward, and when the sensing control device 6 monitors the position of the slider 2 moving backward to the initial position, it sends a signal to the control system, and the driving device 4 stops working.

[0073] As a preferred embodiment of the present invention, in step S01, when the pitch bearing 5 stops rotating and the locking pin 3 abuts against the tooth surface of the pitch bearing 5, the control system controls the driving device 4 to stop working after receiving the signal.

[0074] In addition, the present invention further provides a wind turbine impeller system, comprising a wind turbine hub blade locking device according to any one of the above technical solutions.

[0075] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0076] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0077] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A wind turbine hub blade locking device, characterized in that: The invention comprises a fixed base plate (1), a slider (2) slidably connected to the fixed base plate (1), and a driving device (4) connected to the slider (2); an accommodating cavity (201) is provided at one end of the slider (2) away from the driving device (4); a plurality of locking pins (3) arranged in parallel are provided in the accommodating cavity (201); an elastic connecting structure (7) is provided between each locking pin (3) and the bottom surface of the accommodating cavity (201); the driving device (4) can drive the slider (2) to slide so as to make the locking pin (3) fit the tooth surface of a variable pitch bearing (5), thereby locking the blades of the wind turbine generator set.

2. The wind turbine hub blade locking device according to claim 1, characterized in that: In an initial state, the distance between the front end edge of the locking pin (3) and the tooth surface of the tooth root of the pitch bearing (5) is smaller than the stroke of the drive device (4), and the distance that the locking pin (3) can be compressed backward is at least greater than half of the stroke of the drive device (4).

3. The wind turbine hub blade locking device according to claim 1, characterized in that: The fixed bottom plate (1) is provided with a sliding guide rail (8), and the sliding block (2) is correspondingly provided with a sliding groove. The cross section of the sliding guide rail (8) is trapezoidal, and the surface connected to the fixed bottom plate (1) is smaller than the other opposite surface.

4. The wind turbine hub blade locking device according to claim 1, characterized in that: The locking pin (3) is formed into a strip-shaped structure, and the opposite side surfaces of its end are formed into tooth surfaces.

5. The wind turbine hub blade locking device according to claim 1, characterized in that: The elastic connection structure (7) comprises a central connecting rod (701) and an elastic member (702) sleeved on the central connecting rod (701); one end of the elastic member (702) is connected to the slider (2), and the other end is connected to the bottom surface of the accommodating cavity (201); one end of the central connecting rod (701) is fixedly connected to the end of the locking pin (3), and the other end is movably connected to the slider (2).

6. The wind turbine hub blade locking device according to any one of claims 1 to 5, characterized in that: The driving device (4) is a hydraulic driving device, an electric driving device or a starting driving device.

7. The wind turbine hub blade locking device according to any one of claims 1 to 5, characterized in that: It also includes a sensor control device (6) and a control system, wherein the sensor control device (6) includes an infrared sensor, a signal processor and an electric hydraulic controller, and the sensor control device (6) is arranged on the side of the drive device (4) and close to the end surface of the connection end between the slider (2) and the drive device (4), and the control system is signal-connected to the sensor control device (6) and the drive device (4).

8. A control method for a wind turbine hub blade locking device, applied to the wind turbine hub blade locking device according to any one of claims 1 to 7, characterized in that: The steps include: Step S01: When the variable pitch bearing (5) needs to be locked, the control system receives a manual command or an automatic command, controls the driving device (4) to drive the slider (2) to move forward until the locking pin (3) abuts against the tooth surface of the variable pitch bearing (5), and the sensor control device (6) monitors the distance the slider (2) moves forward; Step S02, when the variable pitch bearing (5) is released, the control system receives a manual command or an automatic command, controls the driving device (4) to drive the slider (2) to move backward, and when the sensing control device (6) monitors the position of the slider (2) moving backward to the initial position, sends a signal to the control system, and the driving device (4) stops working.

9. The control method of the wind turbine hub blade locking device according to claim 8, characterized in that: In step S01, the variable pitch bearing (5) stops rotating, and when the locking pin (3) abuts against the tooth surface of the variable pitch bearing (5), the control system controls the driving device (4) to stop working after receiving a signal.

10. A wind turbine impeller system, characterized in that: The invention comprises a wind turbine hub blade locking device according to any one of claims 1 to 7.

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