Alarm system and alarm method for looseness of wind turbine tower bolts

Abstract

The invention belongs to the technical field of real-time detection of bolt looseness, and discloses an alarm system and an alarm method for wind turbine tower bolt looseness. The magnetically attached magnet is disconnected by the displacement generated by the bolt looseness, and the magnet is disconnected by the action of a switch. The signal is converted into a change in resistance; the number and position of bolt looseness are obtained through the acquisition, transmission and analysis of the resistance signal. The present invention uses the up and down displacement changes caused by loosening, and under the action of the insulating column force, the magnet bolts magnetically attached to the bottom of the bolts are separated, and the falling of the magnets disconnects the closed switch through the action of the connecting rope. The change in resistance monitors the number of loose bolts. In addition, the bolts are grouped to determine the location of looseness, narrow the monitoring range, and perform more accurate and targeted maintenance. The invention can judge the quantity and position of the loose bolts, and is of great help to the development and improvement of the state monitoring system of the tower.

Description

technical field [0001] The invention belongs to the technical field of real-time detection of bolt looseness, and in particular relates to an alarm system and an alarm method for wind turbine tower bolt looseness. Background technique [0002] At present, in recent years, the environment has gradually deteriorated and the reserves of fossil energy have continued to decrease. Countries around the world have continuously paid more attention to and developed new energy. As a clean energy with relatively mature technology development, wind power has also achieved rapid growth in global installed capacity. Due to the complex working mode of wind turbines, the wind turbine tower bears the aerodynamic loads of various natural winds and the gravity loads of the nacelle and the wind rotor, so its safety is particularly important, and once a failure occurs, it will cause huge losses. Flanges and bolts are the main connection methods of the tower, and its safety is particularly import...

AI Technical Summary

Problems solved by technology

Difficulty in the maintenance process

[0005] (2) The maintenance for the loosening of the tower bolts is a periodic maintenance, and the maintenance is not targeted, the workload is heavy, time-consuming and labor-intensive

At present, in the monitoring technology for bolt looseness, there are methods to monitor the bolts at the flange according to vibration signals, strain signals, etc., but because the tower is in an irregular vibration state, there are certain limitations in the processing of signal interference and feature extraction. Difficult, and difficult to reposition restoratively after retightening of bolts

[0006] The difficulty in solving the above problems and defects is: due to the large number of bolts at the flange of the wind turbine tower, how to more effectively monitor the number and position of bolt looseness is a current problem

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