A wind turbine generator system monitoring system

Abstract

The present application relates to the technical field of wind turbine generator system, and discloses a wind turbine generator system monitoring system, which comprises a movable plate, a driving part for driving the movable plate to move, the driving part makes the movable plate close to and away from the nut of the wind turbine generator system, a plurality of rotating bodies, the rotating bodies are rotatably installed on the movable plate, and the rotating bodies are provided with a defect part corresponding to the nut for the nut to enter, a plurality of positioning structures for limiting the rotation of the rotating bodies, and a pressure sensor for detecting the pressure between the driving part and the movable plate; the driving part moves the movable plate to the nut, and when the pressure exceeds a set value, the driving part moves the movable plate away from the nut; the movable plate has a defect part corresponding to the nut in part or in whole, the defect part of the movable plate can be moved to the outside of the nut when the nut is not loose, and the movable plate is blocked when the nut is loose, so that it can be judged whether the nut is loose; manual inspection is reduced; and the defect part is located on the rotating body which can rotate, so that different angle states of the nut can be adapted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind turbine generator systems, in particular to a wind turbine generator system monitoring system. BACKGROUND

[0002] The number of tower bolt and blade root bolt of the wind turbine generator system is large and is uniformly distributed in the circumference. During the working process of the wind turbine generator system, the blade rotates, and the bolt needs to bear static load and dynamic load. During the working process, nut loosening or even bolt falling off will cause bolt connection failure.

[0003] The transmission mode is to draw corresponding lines on the nut and the bolt head. Artificial periodic inspection is performed on whether the lines on the nut are dislocated to determine whether the nut is loose. The loose nut is reinforced. This mode needs to consume a large amount of manpower, and the nut at a high position is inconvenient for artificial inspection.

[0004] In the prior art, the patent for invention with publication number CN110388951B discloses a wind turbine generator bolt loosening monitoring device and method. The bolt loosening is monitored through laser reflection and reception. However, this technology can only be used for the flange bolt structure in the cylinder. When the flange and the bolt are located outside the cylinder, the technology cannot be used due to the shielding of the tower cylinder or the blade root. Moreover, the technology makes the cable and the ladder have to be arranged at the central part of the tower cylinder. In the prior art, the patent for invention with publication number CN114278515A discloses a wind power remote monitoring system based on the Internet of Things. This technology has the same problem as the former one. Moreover, a bolt with a clamping strip needs to be used. The bolt used is a non-standard part, which is inconvenient to use. The clamping strip affects the use of the bolt.

[0005] In the prior art, the patent for invention with publication number CN116591907B discloses a wind turbine variable pitch bearing and connecting bolt state monitoring method and system. Laser is used to monitor the loosening of each bolt. However, the number of wind turbine tower cylinder blade root bolts is large. There are up to hundreds of bolts in one circle. This mode has a high cost.

[0006] In addition, a certain torque needs to be reached during bolt installation. After the installation of the bolt is completed, the rotation state angles of the bolt heads and nuts at different positions are inconsistent. That is, after the construction is completed, the workers cannot make one angle of all nuts face the center of rotation or make one side of all nuts face the center of rotation. This causes certain difficulty in the installation of the bolt monitoring and control system in the above-mentioned prior art. SUMMARY

[0007] The present application relates to the technical field of wind turbine generator systems, in particular to a wind turbine generator system monitoring system.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0009] A wind turbine monitoring system, comprising:

[0010] A movable plate and a driving member for driving the movable plate to move, the driving member moves the movable plate to approach and move away from the nut of the wind turbine;

[0011] A plurality of rotating bodies corresponding to the nut, the rotating bodies are rotatably installed on the movable plate, and the rotating bodies are provided with a defect corresponding to the nut for the nut to enter;

[0012] A plurality of positioning structures corresponding to the rotating bodies and limiting the rotation of the corresponding rotating bodies;

[0013] A guide structure for providing linear guidance for the movement of the movable plate;

[0014] A pressure sensor for detecting the pressure between the driving member and the movable plate; the driving member moves the movable plate to move towards the nut, and when the pressure exceeds a set value, the driving member moves the movable plate away from the nut.

[0015] Further, it further comprises a range finder; the range finder measures the maximum distance of the movable plate moving towards the nut; when the distance reaches a set value, it is determined that the nut is not loose; and when the distance is less than one times the thickness of the nut, it is determined that the nut is loose.

[0016] Further, the shape of the movable plate is annular and surrounds the tower of the wind turbine; the guide structure comprises a plurality of guide rails arranged axially on the outside of the tower, and the inner ring side of the movable plate is provided with a sliding groove matched with the guide rail.

[0017] Further, the edge of the movable plate is provided with a plurality of arc-shaped grooves, the inner side of the movable plate in the arc-shaped groove is provided with an arc-shaped hole corresponding to the arc-shaped groove, and an arc-shaped gap is arranged between the arc-shaped hole and the groove surface; the rotating body comprises a rotating plate, the rotating plate passes through the arc-shaped gap, and the edge of the rotating plate is provided with a sliding body matched with the arc-shaped hole in sliding manner.

[0018] Further, the positioning structure comprises a sliding block and a door-shaped frame, the movable plate is provided with a guide groove matched with the sliding block in sliding manner, and the guide groove is communicated with the arc-shaped hole; the outer ring side of the sliding body is uniformly provided with a slot, and one side of the lower part of the sliding block is provided with a insertion strip matched with the slot; the door-shaped frame is connected with the movable plate, a spring is arranged between the door-shaped frame and the sliding block, the spring makes the sliding block enter the guide groove and the insertion strip inserted into the slot; the outer side of the sliding block is connected with a traction body.

[0019] Preferably, the shape of the rotating body is circular, the shape of the rotating plate is circular plate, and the shape of the sliding body is circular ring; the defect is a hexagonal through hole for the nut to enter.

[0020] Preferably, the rotating body is semicircular, the rotating plate is semicircular plate, and the sliding body is semicircular ring; the straight edge of the rotating plate is provided with the defect corresponding to the nut part.

[0021] Preferably, the defect corresponds to half of the nut, and the defect has four surfaces corresponding to four adjacent surfaces of the nut.

[0022] Preferably, the defect corresponds to half of the nut, and the defect has three surfaces corresponding to three adjacent surfaces of the nut.

[0023] Compared with the prior art, the application has the following advantages:

[0024] The defect on the movable plate corresponds to the nut part or the whole nut, and the defect can semi-enclose or fully enclose the nut. When the loosening angle of the nut changes, the nut will block the linear movement of the rotating body and the movable plate, so that the movement range of the movable plate is reduced by one time of the thickness of the nut. By moving the movable plate towards the nut, the defect of the movable plate can be moved to the outside of the nut when the nut is not loosened, and the movable plate is blocked when the nut is loosened, so that it can be judged whether the nut is loosened or not. Artificial inspection is reduced, and the defect is located on the rotating body, which can easily adapt to different angle states of the nut after installation and fastening.

[0025] The pressure sensor is arranged to avoid excessive force of the movable plate under the driving of the driving part, and to reduce the damage of the rotating body structure.

[0026] The distance measuring instrument is arranged to measure the movement distance of the movable plate, and the change of the movement distance of the movable plate can be used to judge whether the nut is loosened or not, so that remote monitoring is facilitated, targeted on-site inspection is implemented, and labor cost is reduced.

[0027] The positioning structure is arranged to ensure that the rotating body does not rotate out of position during use, and to ensure that the defect of the rotating body can cooperate with the nut that is not loosened. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a perspective structure diagram of example 1.

[0029] Figure 2 It is a side view structure diagram of example 1.

[0030] Figure 3 It is a top view structure diagram of example 1.

[0031] Figure 4 It is Figure 1 A partial enlarged view.

[0032] Figure 5 It is a movable plate structure diagram of example 1.

[0033] Figure 6 Figure 1 is a schematic diagram of the connection structure between the rotating body and the movable plate of the embodiment 1.

[0034] Figure 7 Figure 2 is a schematic diagram of the rotating body structure of the embodiment 1.

[0035] Figure 8 Figure 3 is a schematic diagram of the positioning structure of the embodiment 1 from the first perspective.

[0036] Figure 9 Figure 4 is a schematic diagram of the positioning structure of the embodiment 1 from the second perspective.

[0037] Figure 10 Figure 5 is a schematic diagram of the movable plate moving range of the embodiment 1.

[0038] Figure 11 Figure 6 is a schematic diagram of the connection structure between the rotating body and the movable plate of the embodiment 2.

[0039] Figure 12 Figure 7 is a schematic diagram of the rotating body structure of the embodiment 2.

[0040] Figure 13 Figure 8 is a schematic diagram of the connection structure between the rotating body and the movable plate of the embodiment 3.

[0041] Figure 14 Figure 9 is a schematic diagram of the rotating body structure of the embodiment 3.

[0042] In the figure: 1, movable plate; 2, rotating body; 3, positioning structure; 4, defect; 5, driving member; 6, pressure sensor; 7, guide rail; 8, range finder; 9, arc-shaped slot; 10, arc-shaped hole; 11, arc-shaped notch; 12, guide slot; 13, sliding slot; 14, tower tube; 15, flange; 16, bolt; 17, nut;

[0043] 21, rotating plate; 22, sliding body; 23, insertion slot;

[0044] 31, sliding block; 32, insertion strip; 33, limiting block; 34, door-shaped frame; 35, spring; 36, connecting body; 37, traction ring. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, that is, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0046] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" that can occur should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" that can occur should be understood in a broad sense, for example, the object of "provided with" can be part of the body, or arranged separately from the body and connected to the body, which connection can be detachable connection, or non-detachable connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Specific embodiment 1 of the wind turbine generator monitoring system provided by the present application:

[0049] Please refer to Figures 1-10 , the wind turbine generator monitoring system is used for monitoring whether the bolts 16 uniformly distributed in a circle at a position of the wind turbine generator are loose; comprising a movable plate 1 and a driving member 5 for driving the movable plate 1 to move, a plurality of rotating bodies 2 corresponding to the nuts 17 one by one, a plurality of positioning structures 3, a guide structure, a pressure sensor 6 and a range finder 8.

[0050] In this embodiment, the bolts 16 outside the tower 14 of the wind turbine generator are taken as an example to describe the monitoring system in detail. The movable plate 1 is annular and surrounds the tower 14 of the wind turbine generator. The driving member 5 is an electric telescopic rod. Four electric telescopic rods are arranged. Four electric telescopic rod mounting seats are uniformly arranged on the outer side of the tower 14. The electric telescopic rods are mounted on the lower side of the electric telescopic rod mounting seats. The lower end of the electric telescopic rod is a telescopic end and is connected with the movable plate 1, so as to drive the movable plate 1 to ascend and descend. The movable plate 1 is located on the upper side of the nut 17 of the flange 15 of the wind turbine tower 14. The driving member 5 drives the movable plate 1 to ascend and descend, so as to drive the movable plate 1 to move away from and approach the nut 17 of the wind turbine generator.

[0051] In some other embodiments, the movable plate 1 can be arranged in an arc shape, and a plurality of movable plates 1 are arranged. The plurality of movable plates 1 are arranged in an annular shape with the tail end of one movable plate 1 abutting the head end of the next movable plate 1. The plurality of movable plates 1 are driven by the driving member 5 respectively.

[0052] The guiding structure provides linear guidance for the movement of the movable plate 1. The guiding structure comprises a plurality of guide rails 7 arranged axially outside the tower 14, and the movable plate 1 is provided with a sliding groove 13 on the inner ring side, which slides along the outer side of the guide rail 7 to make the movable plate 1 vertically ascend and descend. The upper end of the guide rail 7 is provided with a limiting part. In this embodiment, the number of guide rails 7 is eight, which are evenly distributed on the outer side of the tower 14. The eight guide rails 7 prevent the movable plate 1 from tilting when ascending and descending, and ensure the horizontality of the movable plate 1. When the wind turbine is not in the tower 14, the movable plate 1 should be perpendicular to the axial direction of the cylindrical structure.

[0053] In some other embodiments, such as when the flange 15 and the bolt 16 are located inside the cylinder, the guide rail 7 is arranged on the inner side of the cylinder structure of the wind turbine generator, the sliding groove 13 is arranged on the outer ring side of the movable plate 1, and the rotating body 2 is located on the inner ring edge of the movable plate 1.

[0054] In this embodiment, the rotating body 2 is rotatably installed on the outer ring edge of the movable plate 1, and the rotating body 2 can rotate. Specifically, the edge of the movable plate 1 is provided with a plurality of arc-shaped grooves 9, the inner side of the movable plate 1 in the arc-shaped grooves 9 is provided with arc-shaped holes 10 corresponding to the arc-shaped grooves 9, and the arc-shaped holes 10 and the groove surfaces of the arc-shaped grooves 9 are provided with arc-shaped notches 11. The rotating body 2 comprises a rotating plate 21, the rotating plate 21 passes through the arc-shaped notches 11, the edge of the rotating plate 21 is provided with a sliding body 22 which is in sliding cooperation with the arc-shaped holes 10, and the sliding body 22 can slide circumferentially in the arc-shaped holes 10 to realize rotation. The cross section of the sliding body 22 is circular, and the outer diameter of the sliding body 22 is greater than the thickness of the rotating plate 21. The cross section of the arc-shaped hole 10 is circular and is adapted to the sliding body 22. The upper and lower spans of the arc-shaped notch 11 are adapted to the thickness of the rotating plate 21 and can allow the rotating plate 21 and the rotating body 2 to rotate. The rotating plate 21 is made of high manganese steel, which has good wear resistance and deformation resistance.

[0055] The rotating body 2 is provided with a missing part 4 corresponding to the nut 17 for the nut 17 to enter. In this embodiment, the shape of the rotating body 2 is circular, the shape of the rotating plate 21 is circular plate, and the shape of the sliding body 22 is circular ring. The center of the rotating plate 21 is provided with a missing part 4, which is a hexagonal through hole for the nut 17 to enter. In some embodiments, the hexagonal through hole is just for the nut 17 to enter. In this embodiment, when the nut 17 enters the hexagonal through hole, there is a small gap between the nut 17 and the hexagonal through hole.

[0056] After the bolt 16 of the flange 15 of the tower drum 14 is installed and fastened, the corresponding lines are drawn on the head of the nut 17 and the nut 17; the monitoring system of the embodiment is installed; since the angle states of the nut 17 at each position of the circumference after reaching the fastening torque are different, the rotating body 2 is rotated so that the deficiency 4, i.e. the hexagonal hole, is vertically corresponding to the nut 17; in this way, the hexagonal hole of all rotating bodies 2 is vertically corresponding to the nut 17. When the driving part 5 makes the movable plate 1 descend, all nuts 17 can enter the inside of the hexagonal hole of the corresponding rotating body 2. When the nut 17 is loosened, the loosened nut 17 cannot be aligned with the corresponding hexagonal hole, and when the movable plate 1 descends, the loosened nut 17 is placed on the lower side of the movable plate 1, thereby limiting the descending distance of the movable plate 1; according to the different descending distances of the movable plate 1 in the two cases, it can be judged that the nut 17 at the position of the circumference has the loosening phenomenon. Then the loosened nut 17 is checked by drawing the loosening line manually, and after being fastened, the rotating body 2 is adjusted to make the hexagonal hole corresponding to the fastened nut 17.

[0057] Since the wind turbine generator set vibrates during operation, in order to avoid the misalignment of the rotating body 2, the rotating body 2 is always corresponding to the nut 17 which is not loosened. The positioning structure 3 is arranged in the embodiment, the positioning structure 3 corresponds to the rotating body 2 one by one, and limits the rotation of the corresponding rotating body 2.

[0058] The positioning structure 3 includes the sliding block 31 and the door-shaped frame 34, the guiding groove 12 which is in sliding cooperation with the sliding block 31 is arranged on the movable plate 1, the sliding block 31 vertically slides in the guiding groove 12, and the guiding groove 12 is communicated with the arc-shaped hole 10; the outer ring side of the sliding body 22 of the rotating body 2 is uniformly provided with the insertion groove 23, one side of the lower part of the sliding block 31 is provided with the insertion strip 32 which is in cooperation with the insertion groove 23, the insertion strip 32 inserted into the insertion groove 23 can realize the positioning of the sliding body 22 and the rotating body 2, thereby avoiding the rotation of the rotating body 2; the door-shaped frame 34 is connected with the movable plate 1, the spring 35 is arranged between the door-shaped frame 34 and the sliding block 31, specifically, the limiting block 33 is arranged on the upper end of the sliding block 31, two springs 35 are connected between the limiting block 33 and the door-shaped frame 34, the spring 35 applies the downward force to the limiting block 33 and the sliding block 31, so that the sliding block 31 enters the guiding groove 12, and the insertion strip 32 of the sliding block 31 is firmly cooperated with the insertion groove 23, thereby realizing the positioning of the rotating body 2, even if there is a certain vibration outside, the cooperation between the insertion strip 32 and the insertion groove 23 can also be ensured not to be separated.

[0059] To facilitate the rotation adjustment of the rotating body 2, a traction body is connected to the outside of the slider 31. In this embodiment, the traction body includes a traction ring 37 and a connecting body 36. The connecting body 36 passes through the portal frame 34 and is connected to the limiting block 33. The portal frame 34 has a through hole for the connecting body 36 to pass through. The upper end of the connecting body 36 is connected to the traction ring 37. By pulling the traction ring 37, the limiting block 33 and the slider 31 move upward to compress the spring 35. The insert 32 at the bottom of the slider 31 separates from the slot 23 of the rotating body 2, allowing the rotating body 2 to rotate freely. After the rotating body 2 is adjusted to the correct position, the traction body is released, and the spring 35 causes the insert 32 and the slot 23 to engage again, positioning the rotating body 2.

[0060] Pressure sensor 6 is disposed between movable plate 1 and drive component 5. Pressure sensor 6 detects the pressure between drive component 5 and movable plate 1; a controller is set so that drive component 5 moves movable plate 1 toward nut 17, and when the pressure exceeds the set value, drive component 5 moves movable plate 1 away from nut 17.

[0061] When the lower side of the movable plate 1 is not under force, the pressure sensor 6 detects the downward gravity of the movable plate 1 and its connecting structure. When the movable plate 1 moves to the upper side of the loose nut 17 or the upper side of the flange 15, the drive component 5 continues to apply downward force. The pressure detected by the pressure sensor 6 first decreases because the downward resistance of the movable plate 1 balances the gravity of the movable plate 1. The drive component 5 continues to apply pressure, and the upward force detected by the pressure sensor 6 gradually increases because the movable plate 1 cannot move down. When the pressure detected by the pressure sensor 6 exceeds the set value, which is twice the gravity of the movable plate 1 and its connecting structure, it proves that the movable plate 1 cannot move down. The controller controls the drive component 5 to reset, and the movable plate 1 rises to reset.

[0062] The above process can be observed manually. In this embodiment, to reduce the labor costs caused by extensive manual inspections, an automatic remote monitoring method is preferred. The rangefinder 8 is connected to the controller and sends signals to the controller. During the operation of the aforementioned driving component 5, refer to... Figure 10 The rangefinder 8 measures the maximum distance the movable plate 1 can move towards the nut 17. If this distance reaches the set value L, it is determined that the nut 17 is not loose. If this distance is less than the set value L by one times the thickness N of the nut 17, that is, the maximum distance is M, it is determined that the nut 17 is loose. Because the loose nut 17 deflects at an angle and cannot enter the notch 4, the loose nut 17 sits on the underside of the movable plate 1, limiting the maximum distance the movable plate 1 can move in a single stroke.

[0063] When detecting that the nut 17 is loose, the controller sends an alarm information to the control center through the wireless communication module; that is, the staff can be arranged to carry out targeted maintenance, and the staff does not need to carry out on-site patrol when the nut 17 is not loose, so that the labor cost of patrol monitoring is reduced. In some embodiments, a timer is arranged to provide a detection period for the nut 17 loose monitoring of the monitoring system, for example, the timer is set to one week, and the controller controls the movable plate 1 to move one stroke every week to detect the nut 17 once.

[0064] Specific embodiment 2 of the wind generating set monitoring system provided by the application:

[0065] Please refer to Figures 11-12 In the embodiment 1, the rotating body 2 is circular, and in the present embodiment, the shape of the rotating body 2 is semicircular, the shape of the rotating plate 21 is semicircular plate, and the shape of the sliding body 22 is semicircular ring. The rotating plate 21 is provided with a defect 4 in the middle of the straight edge, and the defect 4 corresponds to part of the nut 17 and is used for the part of the nut 17 to enter.

[0066] Specifically, the defect 4 corresponds to half of the nut 17, and the defect 4 has four faces corresponding to four adjacent side faces of the nut 17 respectively.

[0067] In the embodiment 1, the rotating body 2 is not easy to be disassembled and replaced; in the present embodiment, the rotating body 2 is semicircular, and after the sliding block 31 of the positioning structure 3 is separated from the sliding body 22 of the rotating body 2, the rotating body 2 can be easily rotated and disassembled. When the rotating body 2 is damaged, it can be conveniently replaced.

[0068] Specific embodiment 3 of the wind generating set monitoring system provided by the application:

[0069] Please refer to Figures 13-14 In the present embodiment, the defect 4 corresponds to half of the nut 17; and the difference from the embodiment 2 is that the defect 4 has three faces corresponding to three adjacent side faces of the nut 17 respectively.

[0070] In summary, in the embodiment 2 and the embodiment 3, the size of the defect 4 is smaller than that of the embodiment 1, but it can be disassembled and replaced. When the nut 17 is loose, the nut 17 is deflected, and at least two to three corner parts of the nut 17 can be guaranteed to be padded under the movable plate 1.

[0071] Finally, it should be noted that the above only describes the preferred embodiments of the application and is not used to limit the application. Although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions recorded in the foregoing embodiments without creative labor, or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A wind turbine generator system monitoring system characterized by, The utility model relates to a wind turbine nut tightening device, comprising: a movable plate (1) and a driving element (5) for driving the movable plate (1) to move, the driving element (5) drives the movable plate (1) to move towards and away from a nut (17) of a wind turbine; a plurality of rotating bodies (2) corresponding to the nut (17), the rotating bodies (2) are rotatably installed on the movable plate (1), and the rotating bodies (2) are provided with a defect (4) corresponding to the nut (17) for the nut (17) to enter; a plurality of positioning structures (3) corresponding to the rotating bodies (2) and limiting the corresponding rotating bodies (2) from rotating; a guide structure for providing linear guidance for the movement of the movable plate (1); a pressure sensor (6) for detecting the pressure between the driving element (5) and the movable plate (1); the driving element (5) drives the movable plate (1) to move towards the nut (17), and when the pressure exceeds a set value, the driving element (5) drives the movable plate (1) to move away from the nut (17).

2. A wind turbine generator system monitoring system according to claim 1, characterized by, The utility model further comprises a range finder (8); the range finder (8) measures the maximum distance of the movable plate (1) moving towards the nut (17); when the distance reaches a set value, it is determined that the nut (17) is not loose; and when the distance is less than the set value and one thickness of the nut (17), it is determined that the nut (17) is loose.

3. The wind turbine generator system monitoring system according to claim 1, characterized by, The movable plate (1) is annular and surrounds a tower (14) of the wind turbine; the guide structure comprises a plurality of guide rails (7) arranged axially on the outside of the tower (14), and the inner ring side of the movable plate (1) is provided with a sliding groove (13) matched with the guide rails (7).

4. The wind turbine generator system monitoring system according to claim 1, characterized by, The edge of the movable plate (1) is provided with a plurality of arc-shaped grooves (9), the inner side of the movable plate (1) in the arc-shaped grooves (9) is provided with an arc-shaped hole (10) corresponding to the arc-shaped grooves (9), and an arc-shaped gap (11) is arranged between the arc-shaped hole (10) and the groove surface of the arc-shaped groove (9); the rotating body (2) comprises a rotating plate (21) penetrating through the arc-shaped gap (11), and the edge of the rotating plate (21) is provided with a sliding body (22) slidingly matched with the arc-shaped hole (10).

5. The wind turbine generator system monitoring system according to claim 4, wherein The positioning structure (3) comprises a sliding block (31) and a door-shaped frame (34), the movable plate (1) is provided with a guide groove (12) slidingly matched with the sliding block (31), the guide groove (12) is communicated with the arc-shaped hole (10); the outer ring side of the sliding body (22) is uniformly provided with a slot (23), one side of the lower part of the sliding block (31) is provided with a plug bar (32) matched with the slot (23); the door-shaped frame (34) is connected with the movable plate (1), a spring (35) is arranged between the door-shaped frame (34) and the sliding block (31), the spring (35) makes the sliding block (31) enter the guide groove (12) and the plug bar (32) is inserted into the slot (23); the outer side of the sliding block (31) is connected with a traction body.

6. A wind power plant monitoring system according to claim 4 or 5, characterised in that, The rotating body (2) is circular, the rotating plate (21) is circular plate-shaped, the sliding body (22) is circular ring-shaped, the rotating plate (21) is provided with the defect (4) at the center, and the defect (4) is a hexagonal through hole for the nut (17) to enter.

7. A wind power plant monitoring system according to claim 4 or 5, characterised in that, The rotating body (2) is semicircular in shape, the rotating plate (21) is semicircular plate-shaped, and the sliding body (22) is semicircular ring-shaped. The rotating plate (21) is provided with the defect (4) in the middle of the straight edge, and the defect (4) corresponds to part of the nut (17) and is used for allowing part of the nut (17) to enter.

8. The wind turbine generator system monitoring system according to claim 7, characterized by, The defect (4) corresponds to half of the nut (17), and the defect (4) has four surfaces corresponding to four adjacent side surfaces of the nut (17) respectively.

9. The wind turbine generator system monitoring system according to claim 7, wherein, The defect (4) corresponds to half of the nut (17), and the defect (4) has three surfaces corresponding to three adjacent side surfaces of the nut (17) respectively.

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