A method for early warning of fracture location of flange connection bolts of wind power generating set

Abstract

The invention provides an early warning method for the fracture location and early warning of the flange connection bolts of the wind power generating set. Firstly, the warehouses are divided according to the wind speed and the flange flight, and the displacement data collected by the split displacement sensor are stored in the corresponding positions according to the wind speed and yaw position. In each preset calculation cycle, calculate the sliding average value and peak value of bolt displacement under the current wind speed and yaw position, and perform bolt loosening alarm, bolt external load excessive alarm and flange clearance monitoring Call the police. The invention can realize bolt loosening alarm, bolt external load excessive alarm and flange gap monitoring alarm through split displacement sensor combined with wind speed signal and yaw signal, with comprehensive calculation, high calculation efficiency and strong reliability; real-time online monitoring The fracture of the connecting bolts between the flanges can avoid equipment damage caused by the failure of the flange connecting bolts.

Description

technical field [0001] The invention relates to an early warning method for the fracture of flange connection bolts of wind turbines, and belongs to the technical field of flange connection bolt monitoring of wind turbines. Background technique [0002] Flange connection refers to a detachable connection in which flanges, gaskets and bolts are connected to each other as a set of combined sealing structures. Flange connection structures are extremely common in the current industrial field and play a very important role. The bolts in the flange connection structure are subjected to tension and compression cycles under the action of alternating loads. Under the alternating load of tension and compression, the thread will be plastically deformed and lead to relaxation, which will reduce the preload of the bolt. If the pre-tightening force is too small, the connection will be unreliable, and vibration relaxation, leakage, structural slippage and other phenomena will occur during...

AI Technical Summary

Problems solved by technology

This work is time-consuming and labor-intensive, coupled with the multi-factor influence of personal subjective and objective aspects of the staff, it cannot guarantee that the problem of bolt looseness can be found and eliminated in time every time, so it is necessary to carry out online monitoring of bolt looseness

[0003] At present, there are usually three methods for monitoring bolt looseness: the first method is based on the measurement method of the gasket type force sensor, and a special force sensor is set on the bolt like a gasket, and the pressure of the sensor is the axial direction of the bolt. This method requires a special sensor according to the space and bolt size. The process is cumbersome and the cost is high. The second method is the ultrasonic method. This method calculates the elongation of the bolt according to the ultrasonic time and speed, and calculates it based on the axial stiffness of the bolt. The axial force of the bolt, this method needs to install a specific sensor on the bolt head; the third method is based on the camera technology to monitor whether the nut of the bolt connection pair rotates, if it occurs, it is loose

The first two methods need to monitor the pre-tightening force of each bolt, and each bolt needs to be processed or adopted. The process is complicated and the cost is high; the third method, in order to realize the monitoring of all bolts in the flange connection, Usually at least two high-precision cameras need to be installed, which has high requirements for the installation environment and high cost

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