Monitoring system for cracks in wind turbine blades and bearings

Abstract

The invention provides a monitoring system for cracks in blades and bearings of wind turbines, which at least includes a sensing layer and a disconnection monitoring device installed on the circumferential outer wall of the root of the blade, the two are connected by wires, and a wireless receiving device and I / O interface, the disconnection monitoring device includes a housing, an energy storage module, an on-off monitoring module and a wireless transmitting module, the wireless transmitting module is connected with the on-off monitoring module and transmits the signals monitored by the on-off monitoring module; wireless The receiving device includes a wireless receiving module and a fault state relay connected with the I / O interface, and the I / O interface is connected with the main control PLC in the engine room; the invention can directly detect the blade crack condition and issue an alarm or stop command, and the disconnection The waterproof and dustproof structure of the monitoring device makes it less susceptible to environmental influences, the detection results are accurate and can meet various harsh environmental conditions, and the invention has the advantages of simple installation process and convenient operation.

Description

technical field [0001] The invention belongs to the field of wind turbine monitoring, in particular to a monitoring system for wind turbine blades and bearing cracks. Background technique [0002] Wind turbine blade and bearing crack monitoring has always been a major problem faced by wind turbines, especially for units that have been in service for more than 10 years, the risk of blade and bearing cracks is very high. If it is discovered and handled properly, it may cause the blade to break or even fall off, resulting in a major safety accident. At present, ultrasonic, magnetic particle, vision, strain gauge and other detection methods are mostly used for the detection of metal cracks. Although these technologies are relatively mature, due to the limited installation space, complicated implementation process, and difficult signal acquisition during the online operation and monitoring of wind turbines, It is easily restricted by various aspects such as external environment ...

AI Technical Summary

Problems solved by technology

[0002] The monitoring of cracks in blades and bearings of wind turbines has always been a major problem for wind turbines. Especially for units that have been in service for more than 10 years, there is a high risk of cracks in blades and bearings. If it is not found and dealt with properly, it may cause the blade to break or even fall off, leading to a major safety accident.

At present, ultrasonic, magnetic powder, visual, strain gauge and other detection methods are mostly used for the detection of metal cracks. Although these technologies are relatively mature, due to the limited installation space, complicated implementation process, and difficult signal acquisition during the online operation monitoring process of wind turbines, Susceptible to external environmental interference, high cost and other aspects, there are not many technologies that can really be applied to wind turbine blades and their bearing crack monitoring in real life

[0003] In addition to ultrasonic, magnetic powder, visual, strain gauge and other detection methods, there is also a method of using conductive loops to detect cracks. For example, in patent CN2017204662132, it is formed by spraying conductive paint. The module is connected to the power module, and the signal processing module is used to output an alarm signal of a wind power bearing crack when the conductive loop is disconnected, or in the patent CN201720746196. On the surface of the bearing, the detection part is electrically connected to the conductive coating to detect the on-off state of the conductive coating and then detect the crack of the bearing; however, the above-mentioned technical solution has high requirements for the application scene and has great limitations. If the blade hub lacks the corresponding signal The transmission interface cannot be used normally, and there is still a closed-loop operation that can only provide monitoring crack signals and cannot realize analysis and judgment and control fan alarm or shutdown

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