Wind generating set flange connecting bolt fracture positioning early warning method

Abstract

The invention provides a wind generating set flange connecting bolt fracture positioning early warning method. The wind generating set flange connecting bolt fracture positioning early warning methodcomprises the following steps of firstly, dividing bins according to wind speed and flange navigation, correspondingly storing displacement data acquired by a split type displacement sensor into corresponding storage bins according to the wind speed and yaw position, calculating a bolt displacement sliding average value and a bolt displacement peak value under the current wind speed and yaw position in each preset calculation period, and carrying out bolt loosening alarm, bolt external load overlarge alarm and flange clearance monitoring alarm. According to the method, bolt looseness alarm, bolt external load overlarge alarm and flange gap monitoring alarm can be carried out through the split type displacement sensor in combination with a wind speed signal and a yaw signal, the calculationis comprehensive, the calculation efficiency is high, and the reliability is high; and the fracture condition of the connecting bolt between the flanges is monitored on line in real time, and equipment damage caused by failure of the flange connecting bolt is avoided.

Description

technical field [0001] The invention relates to a method for early warning of fracture location of flange connection bolts of a wind power generating set, and belongs to the technical field of monitoring flange connection bolts of wind power generating sets. Background technique [0002] Flange connection refers to a detachable connection consisting of flanges, gaskets and bolts connected to each other as a combined sealing structure. 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 alternating loads. Under the action of alternating tension and compression loads, the plastic deformation of the thread leads to relaxation, which will lead to a decrease in the pre-tightening force of the bolt. If the pre-tightening force is too small, the connection will be unreliable, and phenomena such as vibration relaxation, lea...

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

Images