A blade locking device for a wind turbine

Abstract

The application relates to the technical field of wind power and discloses a blade locking device of a wind turbine, which comprises a blade and a hub, one end of the blade is fixedly connected with a bolt, a nut and a gasket are arranged between the hub and the bolt, a tee pipe and a movement mechanism are fixedly installed on the inner side of the hub, and a power module and a signal emission module are fixedly installed on the outer side of the hub. In the application, when the gasket is cracked due to fatigue damage, no matter whether the crack expands from the inner side to the outer side of the gasket or from the outer side to the inner side, the crack will penetrate the flow guide groove path, the negative pressure environment of the sealed chamber is destroyed, the compression spring releases the elastic force to push the piston to move, the electrically-conductive rod is driven to simultaneously connect the first power supply rod of the power module and the second power supply rod of the signal emission module, the circuit is closed, the signal emission module is triggered to send a wireless alarm signal to the operation and maintenance personnel, and high-sensitivity and high-reliability real-time monitoring of the integrity of the gasket is realized.

Description

Technical Field

[0001] This invention relates to the field of wind power technology, and more specifically to a blade locking device for wind turbine generators. Background Technology

[0002] With the deepening of the global energy structure transformation, wind energy, as a clean and renewable strategic energy source, has seen its development and utilization scale continuously expand. The single-unit capacity of wind turbines is constantly increasing, and the blade length and swept area are also significantly increasing accordingly. As the core component of wind turbines for capturing wind energy, the blade is fixed to the hub at one end by a bolted connection structure. This connection structure is usually composed of high-strength bolts, matching nuts, and washers. In actual operation, it must withstand extremely complex alternating loads, including aerodynamic bending moment, gravitational bending moment, centrifugal force, and periodic impacts caused by turbulent wind shear.

[0003] Gaskets play a crucial role in bolted connections, not only distributing the compressive stress of the nut on the connected parts and preventing bolt preload from loosening, but also providing sealing, preventing loosening, and adjusting connection stiffness. However, under harsh operating conditions of alternating high and low temperatures and frequent load cycles, gasket materials inevitably undergo fatigue degradation, leading to the development and gradual propagation of microcracks, which may eventually cause gasket breakage and failure. Once a gasket breaks, the bolt preload will decrease sharply or even be completely lost, the blade connection stiffness will significantly decrease, and this can lead to serious accidents such as bolt fatigue fracture, blade vibration instability, or even blade detachment, posing a fatal threat to the overall safety of the wind turbine. Currently, wind farms mainly rely on manual periodic inspections to monitor the condition of blade connection gaskets. This method is not only inefficient and costly, but also cannot achieve real-time online monitoring during operation, and cannot provide timely warnings of sudden gasket cracks, resulting in long-term latent safety hazards. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a blade locking device for wind turbines to solve the problems existing in the background art.

[0005] This invention provides the following technical solution: a blade locking device for a wind turbine, comprising a blade and a hub. One end of the blade is fixedly connected to a bolt. A nut and a washer are provided between the hub and the bolt. A T-shaped pipe and a motion mechanism are fixedly installed on the inner side of the hub. A power module and a signal transmission module are fixedly installed on the outer side of the hub. The washer is used to trigger the motion mechanism to act when damage occurs. The motion mechanism is used to connect the circuit between the power module and the signal transmission module when triggered. The power module supplies power to the signal transmission module when the circuit is connected, and causes the signal transmission module to issue an alarm signal.

[0006] Preferably, an extension ring is fixedly connected to the inner side of the hub. The extension ring has through holes for bolts to pass through. Multiple through holes are evenly arranged for bolts. A washer is located on the side of the extension ring away from the blade. A nut is located on the side of the washer away from the extension ring and is screwed onto one end of the bolt.

[0007] Preferably, the gasket has two annular grooves inside. The gasket also has clearance holes for bolts to pass through. Multiple clearance holes are evenly distributed for each bolt and are located between the two grooves.

[0008] Preferably, the motion mechanism includes an outer cylinder and a switching assembly. One end of the outer cylinder is provided with a connecting nozzle, which is fixedly connected to the output end of a three-way pipe. The two input ends of the three-way pipe are respectively fixedly connected to the corresponding guide grooves. The other end of the outer cylinder is fixedly connected with an installation head, and a diaphragm is provided on the installation head.

[0009] Preferably, the switching assembly includes a moving rod and an extension rod. A fixed plate is fixedly connected inside the outer cylinder. One end of the moving rod is fixedly connected to the diaphragm, and the other end of the moving rod passes through the fixed plate. A piston is fixedly connected to the other end of the moving rod, and the piston and the outer cylinder form a sealed sliding guide fit.

[0010] Preferably, a support frame is provided on the side of the fixed plate away from the piston, one end of the extension rod is fixedly connected to the support frame, the other end of the extension rod passes through the fixed plate, and the other end of the extension rod is fixedly connected to the piston.

[0011] Preferably, the fixed plate is provided with a movable frame and a guide column on the side away from the piston. One end of the guide column is fixedly connected to the inner wall of the outer cylinder. The movable frame is sleeved on the surface of the guide column. A connecting rod is provided between the movable frame and the support frame. One end of the connecting rod is hinged to the movable frame, and the other end of the connecting rod is hinged to the connecting rod. A conductive rod is fixedly installed on the movable frame.

[0012] Preferably, a compression spring is sleeved on the surface of the moving rod, and the compression spring is located between the diaphragm and the fixed plate.

[0013] Preferably, the power module is provided with a first power-on rod, and the signal transmitting module is provided with a second power-on rod. One end of the first power-on rod extends into the outer cylinder body, and one end of the second power-on rod extends into the outer cylinder body.

[0014] Preferably, the inner wall of the outer cylinder extends inward and is provided with a limiting step, the area between the piston and the connecting nozzle is a chamber, and an air extraction nozzle is provided on the outer cylinder, which is connected to the chamber.

[0015] The beneficial effects of this invention are: In this invention, a flow guide groove with an annular groove structure is formed inside the gasket, and this flow guide groove is sealed and connected to the outer cylinder chamber through a three-way pipe. This, combined with an air extraction nozzle on the outer cylinder, creates negative pressure throughout the sealed chamber. Simultaneously, an on / off component is incorporated into the moving mechanism, ensuring that the chamber maintains negative pressure when the gasket is intact. Under the action of external atmospheric pressure, the diaphragm overcomes the compression spring force, driving the piston to the limit step. The conductive rod remains separated from the first and second energizing rods. When the gasket develops cracks due to fatigue damage, regardless of whether the crack extends from the inside to the outside or from the outside to the inside of the gasket, the crack will penetrate the entire gasket. The guide channel path disrupts the negative pressure environment of the sealed chamber. At this time, the compression spring releases its elastic force to push the piston to move, which in turn drives the conductive rod to simultaneously connect the first energizing rod of the power module and the second energizing rod of the signal transmitting module, realizing circuit closure. This triggers the signal transmitting module to send a wireless alarm signal to the maintenance personnel, achieving high-sensitivity and high-reliability real-time monitoring of the gasket integrity. This effectively prevents major accidents caused by loss of bolt preload due to gasket breakage, improving the safety level of wind turbine operation, while reducing the frequency of inspections and maintenance costs. It has outstanding practical value and broad market promotion prospects. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a diagram showing the fit between the blade and the hub of the present invention.

[0019] Figure 3 This is a diagram showing the fit of the bolt, extension ring, washer, and nut of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the gasket, tee, motion mechanism, power module, and signal transmission module of the present invention.

[0021] Figure 5 For the present invention Figure 4 Enlarged view of the structure at point A in the image.

[0022] Figure 6 This is a schematic diagram of the motion mechanism structure of the present invention.

[0023] Figure 7 This is a schematic diagram of the on / off component structure of the present invention.

[0024] Figure 8 This is a connection diagram of the support frame and movable frame of the present invention.

[0025] The attached figures are labeled as follows: 1. Blade; 11. Bolt; 2. Hub; 21. Extension ring; 211. Through hole; 22. Nut; 3. Washer; 31. Guide groove; 32. Clearance hole; 4. T-pipe; 5. Motion mechanism; 51. Outer cylinder; 511. Connecting nozzle; 512. Air extraction nozzle; 513. Limiting step; 514. Fixing plate; 52. Mounting head; 521. Diaphragm; 53. On / off assembly; 531. Motion rod; 532. Piston; 533. Extension rod; 534. Support frame; 535. Movable frame; 536. Connecting rod; 537. Conductive rod; 538. Guide column; 54. Compression spring; 6. Power module; 61. First energizing rod; 7. Signal transmitting module; 71. Second energizing rod. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Reference Figures 1 to 4 This invention provides a blade locking device for a wind turbine, comprising a blade 1 and a hub 2. One end of the blade 1 is fixedly connected to a bolt 11. A nut 22 and a washer 3 are provided between the hub 2 and the bolt 11. A three-way pipe 4 and a motion mechanism 5 are fixedly installed on the inner side of the hub 2. A power module 6 and a signal transmission module 7 are fixedly installed on the outer side of the hub 2. The washer 3 is used to trigger the motion mechanism 5 to move when damage occurs. The motion mechanism 5 is used to connect the circuit between the power module 6 and the signal transmission module 7 when triggered. The power module 6 supplies power to the signal transmission module 7 when the circuit is connected, and the signal transmission module 7 emits an alarm signal.

[0028] Furthermore, an extension ring 21 is fixedly connected to the inner side of the hub 2. The extension ring 21 has through holes 211 for bolts 11 to pass through. Multiple through holes 211 are evenly arranged corresponding to bolts 11. The washer 3 is located on the side of the extension ring 21 away from the blade 1. The nut 22 is located on the side of the washer 3 away from the extension ring 21 and is screwed onto one end of the bolt 11.

[0029] In summary, by evenly opening multiple through holes 211 on the extension ring 21, the bolt 11 can be accurately inserted and form a stable connection with the blade 1. The nut 22 is located on the side of the washer 3 away from the extension ring 21 and screwed onto the end of the bolt 11. This arrangement not only allows the preload to be evenly transmitted to the extension ring 21 through the washer 3, effectively dispersing the compressive stress of the nut 22 on the hub 2 and avoiding local stress concentration, but also ensures the coaxiality and force balance of the connection between the blade 1 and the hub 2 by the even arrangement of multiple through holes 211, which is beneficial to improving the fatigue life of the connection pair.

[0030] Reference Figures 1 to 5 The gasket 3 has a flow guide groove 31 with an annular groove structure inside. There are two flow guide grooves 31. The gasket 3 also has a clearance hole 32 for the bolt 11 to pass through. Multiple clearance holes 32 are evenly arranged corresponding to the bolt 11, and the clearance holes 32 are located between the two flow guide grooves 31.

[0031] In summary, by creating two annular grooves 31 inside the gasket 3 and evenly distributing clearance holes 32 for the bolts 11 to pass through between the two grooves 31, the two grooves 31 are located on the inner and outer sides of the clearance holes 32, respectively. This forms a double-layer annular detection path in the circumferential direction of the gasket 3. Regardless of whether the fatigue crack extends from the inner side of the gasket 3 to the outer side or from the outer side to the inner side, the crack will inevitably penetrate at least one groove 31, ensuring that the sealing negative pressure environment is reliably destroyed and avoiding monitoring dead zones that may exist with a single groove 31. At the same time, the even distribution of multiple clearance holes 32 ensures the uniform distribution of the bolt 11 preload on the gasket 3, and the design of the clearance holes 32 located between the two grooves 31 avoids structural interference between the openings and the grooves 31. This maintains the overall strength of the gasket 3 and allows the grooves 31 to completely cover the effective pressure-bearing area of ​​the gasket 3, improving the sensitivity and full coverage of the integrity monitoring of the gasket 3.

[0032] Reference Figures 1 to 8 The motion mechanism 5 includes an outer cylinder 51 and a switching assembly 53. One end of the outer cylinder 51 is provided with a connecting nozzle 511, which is fixedly connected to the output end of the three-way pipe 4. The two input ends of the three-way pipe 4 are fixedly connected to the corresponding guide grooves 31 respectively. The other end of the outer cylinder 51 is fixedly connected with an installation head 52, and a diaphragm 521 is provided on the installation head 52.

[0033] In summary, the motion mechanism 5 is fixedly connected to the output end of the three-way pipe 4 via the connector 511 at one end of the outer cylinder 51, and simultaneously fixedly connected to the guide groove 31 inside the gasket 3. This creates a complete sealed connection path between the guide groove 31, the three-way pipe 4, and the outer cylinder 51, providing a structural basis for constructing a negative pressure environment and ensuring that changes in air pressure within the guide groove 31 can be accurately transmitted to the interior of the outer cylinder 51. Meanwhile, the mounting head 52, which is fixedly connected to the other end of the outer cylinder 51, is equipped with a diaphragm 521. As a sensitive pressure sensing element, the diaphragm 521 can convert changes in negative pressure or air pressure within the chamber into its own deformation displacement, thereby driving the on / off assembly 53 to perform corresponding on / off actions. This achieves mechanical transmission throughout the entire process from the occurrence of a crack in the gasket 3 to the triggering of an electrical signal, maintaining stable monitoring without the need for external power supply. This avoids the problems of complex electronic sensors being susceptible to interference and having poor reliability in the harsh environment inside the fan hub 2, and significantly reduces system power consumption and maintenance difficulty.

[0034] Furthermore, the switching assembly 53 includes a moving rod 531 and an extension rod 533. A fixed plate 514 is fixedly connected inside the outer cylinder 51. One end of the moving rod 531 is fixedly connected to the diaphragm 521, and the other end of the moving rod 531 passes through the fixed plate 514. A piston 532 is fixedly connected to the other end of the moving rod 531. The piston 532 and the outer cylinder 51 form a sealed sliding guide fit. A support frame 534 is provided on the side of the fixed plate 514 away from the piston 532. One end of the extension rod 533 is fixedly connected to the support frame 534, and the other end of the extension rod 533 passes through the fixed plate 514. The piston 532 is fixedly connected. The fixed plate 514 is provided with a movable frame 535 and a guide post 538 on the side opposite to the piston 532. One end of the guide post 538 is fixedly connected to the inner wall of the outer cylinder 51. The movable frame 535 is sleeved on the surface of the guide post 538. A connecting rod 536 is provided between the movable frame 535 and the support frame 534. One end of the connecting rod 536 is hinged to the movable frame 535, and the other end of the connecting rod 536 is hinged to the connecting rod 536. A conductive rod 537 is fixedly installed on the movable frame 535. A compression spring 54 is sleeved on the surface of the moving rod 531. The compression spring 54 is located between the diaphragm 521 and the fixed plate 514.

[0035] In summary, the on / off assembly 53 uses the fixed plate 514, which is fixedly connected inside the outer cylinder 51, as a support reference. One end of the moving rod 531 is fixedly connected to the diaphragm 521, and the other end passes through the fixed plate 514 and is fixedly connected to the piston 532. Simultaneously, the piston 532 and the outer cylinder 51 form a sealed sliding guide fit, thereby ensuring that the deformation of the diaphragm 521 can be accurately transmitted to the piston 532 via the moving rod 531, achieving efficient conversion of air pressure changes into mechanical displacement. A support frame 534 is provided on the side of the fixed plate 514 opposite to the piston 532, extending the rod... One end of extension rod 533 is fixedly connected to support frame 534, and the other end passes through fixed plate 514 and is fixedly connected to piston 532. This allows the displacement of piston 532 to simultaneously drive support frame 534 to move synchronously via extension rod 533, forming a double-sided transmission path and improving transmission rigidity and motion consistency. On the side of fixed plate 514 away from piston 532, there is also a movable frame 535 and a guide post 538. Movable frame 535 is fitted onto the surface of guide post 538. The guide post 538 provides precise guidance for movable frame 535, ensuring that movable frame 535 moves along... The straightness and stability of the axial movement prevent skewing and jamming; a connecting rod 536 is hinged between the movable frame 535 and the support frame 534. This hinge structure converts the axial movement of the support frame 534 into synchronous axial sliding of the movable frame 535 along the guide post 538, realizing the conversion of the motion transmission direction and reliable stroke tracking; the conductive rod 537 fixedly installed on the movable frame 535 moves together with the movable frame 535, and can remain separated from the first energized rod 61 and the second energized rod 71 when the gasket 3 is intact, and when the gasket 3 is broken... The precise connection between the two enables a reliable transition from mechanical displacement to circuit switching. The compression spring 54, fitted on the surface of the moving rod 531, is located between the diaphragm 521 and the fixed plate 514. This spring is compressed and stores energy under negative pressure. Once the negative pressure is broken due to leakage from the guide groove 31, the spring releases its elastic force to push the piston 532 to move, providing a stable and repeatable reset driving force. The entire switching assembly 53 is compact and responsive, improving the reliability and lifespan of the monitoring system under long-term vibration and temperature fluctuation conditions of the wind turbine.

[0036] Furthermore, the inner wall of the outer cylinder 51 extends inward and is provided with a limiting step 513. The area between the piston 532 and the connecting nozzle 511 is a chamber. An air extraction nozzle 512 is provided on the outer cylinder 51 and is connected to the chamber.

[0037] In summary, by setting the limiting step 513, a mechanical limit is provided for the movement of the piston 532 after the negative pressure is established, ensuring that the piston 532 can stop at the same fixed position when pushed by atmospheric pressure. This ensures that the conductive rod 537 maintains a stable separation gap with the first energized rod 61 and the second energized rod 71, avoiding false triggering. At the same time, the area between the piston 532 and the connecting nozzle 511 is defined as a chamber. This chamber is sealed and connected to the guide groove 31 and the three-way pipe 4, forming a complete air pressure transmission channel. The suction nozzle 512 on the outer cylinder 51 is connected to the chamber, allowing on-site installation personnel to easily perform vacuuming operations on the sealed system consisting of the chamber, the three-way pipe 4, and the guide groove 31 through the suction nozzle 512 using a vacuum pump.

[0038] Furthermore, the power module 6 is provided with a first power-on rod 61, and the signal transmitting module 7 is provided with a second power-on rod 71. One end of the first power-on rod 61 extends into the outer cylinder 51, and one end of the second power-on rod 71 extends into the outer cylinder 51.

[0039] In summary, by extending one end of the first power rod 61 into the outer cylinder 51 and one end of the second power rod 71 into the outer cylinder 51, the conductive rod 537 can be simultaneously connected or disconnected from the first power rod 61 and the second power rod 71 inside the outer cylinder 51. This integrates the electrical connection node between the power module 6 and the signal transmission module 7 into the outer cylinder 51, avoiding additional wiring outside the hub 2 or in the external environment, and reducing the risk of poor contact or short circuits caused by factors such as vibration, dust, and moisture.

[0040] The working principle of this invention is as follows: After the blade 1 and hub 2 are installed, the operator uses a vacuum pump to extract gas through the vacuum nozzle 512. The chamber, the three-way pipe 4, and the guide groove 31 inside the gasket 3 of the outer cylinder 51 are interconnected. When the chamber, the three-way pipe 4, and the guide groove 31 inside the gasket 3 of the outer cylinder 51 are drawn to a negative pressure state, under the action of atmospheric pressure, the diaphragm 521 deforms towards the fixed plate 514. The moving rod 531 and the piston 532 slide along the inner wall of the outer cylinder 51 until the piston 532 abuts against the limiting step 513. The piston 532 moves and drives the support frame 534 to move synchronously towards the fixed plate 514 through the extension rod 533. The support frame 534 moves and drives the movable frame 535 to slide synchronously along the guide post 538 through the connecting rod 536. The movable frame 535 moves and drives one end of the conductive rod 537 to separate from the first energized rod 61 and the other end to separate from the second energized rod 71.

[0041] When a crack appears in the gasket 3, regardless of whether the crack spreads from the inside to the outside or from the outside to the inside of the gasket 3, the crack passes through the guide groove 31. At this time, the guide groove 31 is connected to the external environment. The chamber inside the outer cylinder 51, the three-way pipe 4, and the guide groove 31 inside the gasket 3 are no longer under negative pressure. The elastic force of the compression spring 54 is released, driving the piston 532 to move away from the limiting step 513. The movement of the piston 532 drives the support frame 534 away from the fixed plate 514 through the extension rod 533. The support frame 534 moves synchronously and drives the movable frame 535 to slide synchronously along the guide column 538 via the connecting rod 536. The movable frame 535 moves and drives the conductive rod 537 to abut against the first energized rod 61 at one end and against the second energized rod 71 at the other end. The power module 6 and the signal transmitting module 7 form a complete circuit. The power module 6 provides power to the signal transmitting module 7. The signal transmitting module 7 transmits a signal. After receiving the signal, the staff can obtain the information that the gasket 3 is broken, so as to maintain it in time.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A blade locking device for a wind turbine, comprising blades (1) and a hub (2), characterized in that, One end of the blade (1) is fixedly connected to a bolt (11). A nut (22) and a washer (3) are provided between the hub (2) and the bolt (11). A three-way pipe (4) and a motion mechanism (5) are fixedly installed on the inner side of the hub (2). A power module (6) and a signal transmission module (7) are fixedly installed on the outer side of the hub (2). The washer (3) is used to trigger the motion mechanism (5) to move when damage occurs. The motion mechanism (5) is used to connect the circuit between the power module (6) and the signal transmission module (7) when triggered. The power module (6) and the signal transmission module (7) are used to supply power to the signal transmission module (7) when the circuit is connected, and to make the signal transmission module (7) issue an alarm signal.

2. The blade locking device for a wind turbine according to claim 1, characterized in that, An extension ring (21) is fixedly connected to the inner side of the hub (2). A through hole (211) for the bolt (11) to pass through is provided on the extension ring (211). Multiple through holes (211) are evenly arranged corresponding to the bolt (11). A washer (3) is located on the side of the extension ring (21) away from the blade (1). A nut (22) is located on the side of the washer (3) away from the extension ring (21) and is screwed onto one end of the bolt (11).

3. The blade locking device for a wind turbine according to claim 1, characterized in that, The gasket (3) has a flow guide groove (31) with an annular groove structure inside. There are two flow guide grooves (31). The gasket (3) also has a clearance hole (32) for the bolt (11) to pass through. There are multiple clearance holes (32) corresponding to the bolt (11) and the clearance holes (32) are located between the two flow guide grooves (31).

4. The blade locking device for a wind turbine according to claim 1, characterized in that, The motion mechanism (5) includes an outer cylinder (51) and a switching assembly (53). One end of the outer cylinder (51) is provided with a connecting nozzle (511), which is fixedly connected to the output end of the three-way pipe (4). The two input ends of the three-way pipe (4) are fixedly connected to the corresponding guide grooves (31). The other end of the outer cylinder (51) is fixedly connected with an installation head (52), and a diaphragm (521) is provided on the installation head (52).

5. A blade locking device for a wind turbine according to claim 4, characterized in that, The switching assembly (53) includes a moving rod (531) and an extension rod (533). A fixed plate (514) is fixedly connected inside the outer cylinder (51). One end of the moving rod (531) is fixedly connected to the diaphragm (521), and the other end of the moving rod (531) passes through the fixed plate (514). A piston (532) is fixedly connected to the other end of the moving rod (531). The piston (532) and the outer cylinder (51) form a sealed sliding guide fit.

6. The blade locking device for a wind turbine according to claim 5, characterized in that, The fixed plate (514) is provided with a support frame (534) on the side away from the piston (532). One end of the extension rod (533) is fixedly connected to the support frame (534), and the other end of the extension rod (533) passes through the fixed plate (514) and is fixedly connected to the piston (532).

7. A blade locking device for a wind turbine according to claim 6, characterized in that, The fixed plate (514) is provided with a movable frame (535) and a guide column (538) on the side away from the piston (532). One end of the guide column (538) is fixedly connected to the inner wall of the outer cylinder (51). The movable frame (535) is sleeved on the surface of the guide column (538). A connecting rod (536) is provided between the movable frame (535) and the support frame (534). One end of the connecting rod (536) is hinged to the movable frame (535), and the other end of the connecting rod (536) is hinged to the connecting rod (536). A conductive rod (537) is fixedly installed on the movable frame (535).

8. The blade locking device for a wind turbine according to claim 7, characterized in that, A compression spring (54) is sleeved on the surface of the moving rod (531), and the compression spring (54) is located between the diaphragm (521) and the fixing plate (514).

9. A blade locking device for a wind turbine according to claim 1, characterized in that, The power module (6) is provided with a first power rod (61), and the signal transmitting module (7) is provided with a second power rod (71). One end of the first power rod (61) extends into the outer cylinder (51), and one end of the second power rod (71) extends into the outer cylinder (51).

10. A blade locking device for a wind turbine according to claim 5, characterized in that, The inner wall of the outer cylinder (51) extends inward and is provided with a limiting step (513). The area between the piston (532) and the connecting nozzle (511) is a chamber. An air extraction nozzle (512) is provided on the outer cylinder (51), and the air extraction nozzle (512) is connected to the chamber.

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