Blade bolt state monitoring system for wind driven generator

Abstract

The utility model relates to the technical field of wind driven generators, in particular to a wind driven generator blade bolt state monitoring system which comprises an outer ring, a detection system control cabinet, a cabin signal receiving cabinet and a centralized control center, a hub flange is fixedly installed on the front face of the outer ring through a bolt assembly, and an inner ring is installed on the inner side of the outer ring. According to the utility model, the nylon nut is arranged on the fixing bolt, when the fixing bolt is broken, the nylon nut can move, namely, the steel wire rope is pulled, so that the limit switch acts, a signal accessed to the limit switch is cut off, the detection system control cabinet sends out an alarm signal, and the alarm signal is transmitted to the cabin signal receiving cabinet in a wireless manner; the cabin signal receiving cabinet transmits information to the centralized control center through the external network of the unit, compared with a monitoring system based on voice recognition, the reliability is high, the cost is low, and the problem of breakage of the fixing bolts can be found in time, so that boarding treatment can be carried out in time, and further deterioration of the situation is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbines, and specifically relates to a monitoring system for the state of blade bolts of a wind turbine. Background Technique

[0002] Wind turbines generally have problems of broken fixing bolts of blades caused by uneven load distribution, rough assembly process, etc. After the blade bolts break, they fall into the hub and cause damage to various internal devices following the rotation of the hub.

[0003] Currently, there is a method of monitoring the state of hub bolts through sound recognition. When the bolts break and fall into the hub, abnormal sounds will be emitted. After the system detects the abnormal sounds, it will issue an instruction to make the unit shut down emergently to avoid damage to other devices, but this system has a probability of false alarms.

[0004] Therefore, in order to solve the above problems, a monitoring system for the state of blade bolts of a wind turbine is proposed. Summary of the Invention

[0005] The purpose of the utility model is to provide a monitoring system for the state of blade bolts of a wind turbine to solve the problem in the prior art mentioned in the above background technique that the state of hub bolts is monitored by sound recognition. When the bolts break and fall into the hub, abnormal sounds will be emitted. After the system detects the abnormal sounds, it will issue an instruction to make the unit shut down emergently to avoid damage to other devices, but this system has a probability of false alarms.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A monitoring system for the state of blade bolts of a wind turbine, comprising: an outer ring, a detection system control cabinet, a nacelle signal receiving cabinet, and a centralized control center. The front surface of the outer ring is fixedly installed with a hub flange through a bolt assembly. An inner ring is installed inside the outer ring. Reinforcing plates are installed on the front and rear side walls of the inner ring. A blade root is installed at the rear of the inner ring. A fixing bolt is passed through the inside of the inner ring. A metal nut is movably installed on the fixing bolt through a thread.

[0007] A monitoring structure is installed inside the outer ring. The monitoring structure includes a nylon nut. The nylon nut is movably installed on the front end of the fixing bolt through a thread. A groove is opened in the middle of the nylon nut. A retaining ring is welded on the surface of the nylon nut. A collar is sleeved inside the groove. A through groove is opened on the surface of the collar. A steel wire rope is passed through the inside of the through groove. A limit switch is fixedly installed on the surface of the reinforcing plate.

[0008] Preferably, the inner ring, the reinforcing plates, and the blade root are fixedly connected together through the cooperation of the fixing bolt and the metal nut.

[0009] Preferably, the nylon nut is located in front of the metal nut.

[0010] Preferably, one end of the steel wire rope is fixedly connected to the reinforcing plate, and the other end of the steel wire rope is connected to the limit switch.

[0011] Preferably, the limit switch, the detection system control cabinet, the nacelle signal receiving cabinet and the centralized control center cooperate with each other.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: by installing a nylon nut on the fixing bolt, when the fixing bolt breaks, the nylon nut will displace, that is, pull the steel wire rope, causing the limit switch to act, and the signal connected to the limit switch will be disconnected. The detection system control cabinet will send out an alarm signal, and the alarm signal will be transmitted to the nacelle signal receiving cabinet wirelessly. The nacelle signal receiving cabinet will transmit the information to the centralized control center through the external network of the unit. Compared with the monitoring system based on sound recognition, it has high reliability, low cost, and can detect the problem of fixing bolt breakage in time, so as to board the plane for treatment in time and avoid the situation from deteriorating further.

[0013] The present utility model is provided with a monitoring structure. The nylon nut is screwed onto the fixing bolt through threads, so that the nylon nut is in contact with the metal nut. By rotating the collar, the collar rotates in the groove, and the angular position of the through groove can be adjusted. The retaining ring is provided to protect the collar, avoid deformation of the collar, and prevent the movement of the collar from getting stuck, affecting the use. The steel wire rope is threaded through the through groove on the collar, so that all the nylon nuts are connected in series. One end of the steel wire rope is fixed on the reinforcing plate, and the other end of the steel wire rope is connected to the limit switch;

[0014] When the fixing bolt breaks and falls off from the inner ring, it will drive the nylon nut to move. The nylon nut will drive the collar to move, and the collar will pull the steel wire rope through the through groove, causing the limit switch to act. The signal connected to the limit switch will be disconnected. The detection system control cabinet will send out an alarm signal, and the alarm signal will be transmitted to the nacelle signal receiving cabinet wirelessly. The nacelle signal receiving cabinet will transmit the information to the centralized control center through the external network of the unit. Compared with the monitoring system based on sound recognition, it has high reliability, low cost, and can detect the problem of fixing bolt breakage in time, board the plane for treatment in time, and avoid the situation from deteriorating further. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view schematic diagram of the structure of the present utility model;

[0016] Figure 2 is a side view sectional schematic diagram of the structure of the present utility model;

[0017] Figure 3 is a front view schematic diagram of the structure of the steel wire rope and the limit switch of the present utility model;

[0018] Figure 4Explosion schematic diagram of the structure of the nylon nut of the present utility model;

[0019] Figure 5 Schematic diagram of the principle of the present utility model.

[0020] In the figure: 1. Outer ring; 11. Hub flange; 12. Inner ring; 13. Reinforcing plate; 14. Blade root; 15. Bolt assembly; 16. Fixed bolt; 17. Metal nut; 2. Monitoring structure; 21. Nylon nut; 22. Groove; 23. Retaining ring; 24. Collar; 25. Through groove; 26. Steel wire rope; 27. Limit switch; 28. Detection system control cabinet; 29. Cabin signal receiving cabinet; 210. Centralized control center. Embodiment

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1-5 , an embodiment provided by the present utility model:

[0023] The outer ring 1, hub flange 11, inner ring 12, reinforcing plate 13, blade root 14, bolt assembly 15, fixed bolt 16, metal nut 17, limit switch 27, detection system control cabinet 28, cabin signal receiving cabinet 29 and centralized control center 210 used in this application are products that can be directly purchased on the market, and their principles and connection methods are all prior arts well-known to those skilled in the art, so they will not be elaborated here.

[0024] A wind turbine blade bolt status monitoring system includes: an outer ring 1, a detection system control cabinet 28, a cabin signal receiving cabinet 29 and a centralized control center 210. The front of the outer ring 1 is fixedly installed with a hub flange 11 through a bolt assembly 15. An inner ring 12 is installed inside the outer ring 1. Reinforcing plates 13 are installed on the front and rear side walls of the inner ring 12. A blade root 14 is installed on the rear side of the inner ring 12. A fixed bolt 16 is passed through the inside of the inner ring 12, and a metal nut 17 is movably installed on the fixed bolt 16 by means of threads;

[0025] Inside the outer ring 1, a monitoring structure 2 is installed. The monitoring structure 2 includes a nylon nut 21. The nylon nut 21 is movably installed at the front end of the fixing bolt 16 by means of threads. A groove 22 is provided in the middle of the nylon nut 21. A retaining ring 23 is welded on the surface of the nylon nut 21. A collar 24 is sleeved inside the groove 22. A through groove 25 is provided on the surface of the collar 24. A steel wire rope 26 is inserted through the through groove 25. A limit switch 27 is fixedly installed on the surface of the reinforcing plate 13. By installing the nylon nut 21 on the fixing bolt 16, when the fixing bolt 16 breaks, the nylon nut 21 will displace, that is, pull the steel wire rope 26, causing the limit switch 27 to act. The signal connected to the limit switch 27 will be disconnected, and the detection system control cabinet 28 will send out an alarm signal. The alarm signal is transmitted wirelessly to the engine room signal receiving cabinet 29. The engine room signal receiving cabinet 29 transmits the information to the centralized control center 210 through the external network of the unit. Compared with the monitoring system based on sound recognition, it has high reliability, low cost, and can timely detect the fracture problem of the fixing bolt 16, so as to board the plane in time for treatment and avoid the situation from deteriorating further.

[0026] Further, the inner ring 12, the reinforcing plate 13 and the blade root 14 are fixedly connected together through the cooperation of the fixing bolt 16 and the metal nut 17. The fixing bolt 16 penetrates through the inner ring 12, the reinforcing plate 13 and the blade root 14.

[0027] Further, the nylon nut 21 is located on the front side of the metal nut 17. By means of the metal nut 17 and the fixing bolt 16, the inner ring 12, the reinforcing plate 13 and the blade root 14 can be fixed, and the installation of the nylon nut 21 is convenient.

[0028] Further, one end of the steel wire rope 26 is fixedly connected to the reinforcing plate 13, and the other end of the steel wire rope 26 is connected to the limit switch 27. When the steel wire rope 26 is subjected to a tensile force, it can drive the limit switch 27 to act.

[0029] Further, the limit switch 27, the detection system control cabinet 28, the engine room signal receiving cabinet 29 and the centralized control center 210 cooperate with each other. When the signal connected to the limit switch 27 is disconnected, the detection system control cabinet 28 sends out an alarm signal. The alarm signal is transmitted wirelessly to the engine room signal receiving cabinet 29. The engine room signal receiving cabinet 29 transmits the information to the centralized control center 210 through the external network of the unit. Compared with the monitoring system based on sound recognition, it has high reliability, low cost, and can timely detect the fracture problem of the fixing bolt 16, board the plane in time for treatment, and avoid the situation from deteriorating further

[0030] Working principle: When in use, screw the nylon nut 21 onto the fixed bolt 16 through the thread, so that the nylon nut 21 fits with the metal nut 17. By rotating the collar 24, the collar 24 rotates in the groove 22, and the angular position of the through slot 25 can be adjusted. The retaining ring 23 is provided to protect the collar 24, avoiding deformation of the collar 24 and causing the movement of the collar 24 to jam, which affects the use. Thread the steel wire rope 26 through the through slot 25 on the collar 24, so that all the nylon nuts 21 are connected in series. Fix one end of the steel wire rope 26 on the reinforcing plate 13, and connect the other end of the steel wire rope 26 to the limit switch 27;

[0031] When the fixed bolt 16 breaks and falls off the inner ring 12, it will drive the nylon nut 21 to move. The nylon nut 21 will drive the collar 24 to move. The collar 24 will pull the steel wire rope 26, causing the limit switch 27 to act. The signal connected to the limit switch 27 will be disconnected, and the detection system control cabinet 28 will send out an alarm signal. The alarm signal is transmitted wirelessly to the cabin signal receiving cabinet 29. The cabin signal receiving cabinet 29 transmits the information to the centralized control center 210 through the external network of the unit. Compared with the monitoring system based on sound recognition, it has high reliability, low cost, and can timely detect the problem of the fixed bolt 16 breaking, and board the plane in time for handling to avoid the situation from deteriorating further.

[0032] The above is only the preferred embodiment of the present invention, and does not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention according to the illustrations in the specification and the above description; however, any minor changes, modifications, and equivalent variations made by those skilled in the art within the scope of the technical solution of the present invention using the technical content disclosed above are equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and variations made to the above embodiments based on the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A wind turbine blade bolt status monitoring system, comprising: An outer ring (1), a detection system control cabinet (28), a cabin signal receiving cabinet (29) and a centralized control center (210), wherein a hub flange (11) is fixedly mounted on the front side of the outer ring (1) via a bolt assembly (15), an inner ring (12) is mounted on the inner side of the outer ring (1), reinforcement plates (13) are mounted on the front and rear side walls of the inner ring (12), a blade root (14) is mounted on the rear side of the inner ring (12), a fixing bolt (16) is passed through the inner side of the inner ring (12), and a metal nut (17) is movably mounted on the fixing bolt (16) via a thread; Features: A monitoring structure (2) is installed on the inner side of the outer ring (1). The monitoring structure (2) comprises a nylon nut (21). The nylon nut (21) is movably installed on the front end of the fixing bolt (16) through a thread. A groove (22) is provided in the middle of the nylon nut (21). A retaining ring (23) is welded on the surface of the nylon nut (21). A collar (24) is sleeved on the inner side of the groove (22). A through groove (25) is provided on the surface of the collar (24). A steel wire rope (26) is passed through the inner side of the through groove (25). A limit switch (27) is fixedly installed on the surface of the reinforcing plate (13).

2. A wind turbine blade bolt status monitoring system according to claim 1, characterized in that: The inner ring (12), the reinforcing plate (13) and the blade root (14) are fixedly connected together by means of the cooperation of fixing bolts (16) and metal nuts (17).

3. A wind turbine blade bolt status monitoring system according to claim 1, characterized in that: The nylon nut (21) is located on the front side of the metal nut (17).

4. A wind turbine blade bolt status monitoring system according to claim 1, characterized in that: One end of the steel wire rope (26) is fixedly connected to the reinforcing plate (13), and the other end of the steel wire rope (26) is connected to the limit switch (27).

5. A wind turbine blade bolt status monitoring system according to claim 1, characterized in that: The limit switch (27), the detection system control cabinet (28), the cabin signal receiving cabinet (29) and the centralized control center (210) cooperate with each other.

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