Coal mining machine rocker arm mechanical transmission system fault accurate positioning method

Abstract

The invention belongs to the technical field of coal mining machine rocker arm mechanical transmission system fault diagnosis, and particularly relates to a coal mining machine rocker arm mechanical transmission system fault accurate positioning method. The method comprises the steps of 1, collecting rocker arm vibration signals in normal and fault states, and performing noise reduction processingon the rocker arm vibration signals through a wavelet transformation method; 2, performing FFT conversion to obtain a spectrogram of the vibration signal; 3, performing comparative analysis on the normal rocker arm spectrogram and the fault rocker arm spectrogram to obtain vibration characteristic frequency of a fault part, and performing preliminary positioning on the fault part; 4, comparing and analyzing the continuous complex Morlet wavelet envelope demodulation spectra of the normal rocker arm and the faulty rocker arm to obtain the rotation frequency of the faulty part; and 5, accurately positioning a faulty part by combining adaptive continuous complex Morlet wavelet envelope demodulation analysis with FFT. The method has important practical significance for guaranteeing safe operation of the coal mining machine, changing preventive periodic maintenance into predictive maintenance, safely and efficiently producing a coal mine, improving the maintenance efficiency and reducing the maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of a rocker arm mechanical transmission system of a shearer, and in particular relates to a method for accurately locating faults of a rocker arm mechanical transmission system of a shearer. Background technique [0002] Shearer is one of the core equipment of modern fully mechanized mining face. Its working environment is harsh, and it is easily affected by huge impact loads such as hard coal and gangue during operation. At the same time, it is continuously corroded by water vapor and coal dust. The inappropriate management, operation and maintenance of the equipment by the workers resulted in frequent failure of the mechanical transmission device of the shearer. In light of this, it will affect the production efficiency of coal mining enterprises, in the worst case, it will lead to equipment damage, production interruption, heavy economic losses and even death of personnel. According to...

AI Technical Summary

Problems solved by technology

The biggest restrictive factor of ferrography analysis is human subjective judgment, which mainly depends on the experience of analysts to judge and sample. The irregular spectrum preparation process often leads to serious misjudgment

The temperature detection method is difficult to realize early fault diagnosis, and cannot realize accurate fault location of mechanical transmission

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