Pulse eddy current detection device and method for fatigue cracks of large mine vibrating screen

Abstract

The invention discloses a pulse eddy current detection method and a device of a fatigue crack of a vibrating screen for a large mine. The device is mainly composed of a single chip microcomputer, a pulse signal generator, a pulse driving circuit, an electric eddy current probe, a signal conditioning circuit, a collection card and a computer. The pulse signal generator is adopted by the device and the method to generate a suitable square signal, the suitable square signal drives the electric eddy current probe through the pulse driving circuit, the electric eddy current probe outputs a signal to enter the computer through the conditioning circuit and the collection card, after the computer conducts denoising and processing of character extracting on a collected signal, according to an estimated crack parameter, a theoretical model simulation result is compared with an experimental result, according to the difference between the theoretical model simulation result and the experimental result, the estimated crack parameter is repeatedly optimized and estimated until the error of the theoretical model simulation result and the experimental result is minimum, and the estimated parameter is taken as a final result to output and display. The device and the method can achieve non-damage quantitative determination of the fatigue crack of the vibrating screen for the large mine, reduce non-planned shut down due to failures, and have large potential economic benefits.

Description

technical field [0001] The invention relates to a pulsed eddy current detection device and method for fatigue cracks of a large mine vibrating screen, belonging to the technical field of mine machinery equipment. Background technique [0002] Coal is one of the main energy sources of my country's national economy. With the continuous deepening of mining, there have been problems such as the increase of gangue mixed with raw coal, the increase of ash content, the increase of fine coal and pulverized coal content, and the increase of water content, which makes the quality of raw coal more and more serious. The worse it is, it will lead to a series of adverse consequences such as waste of transport capacity and environmental pollution. Raw coal washing is an important measure to solve the above problems, and the vibrating screen is the key equipment of the screening process. The increasing demand for coal and the improvement of coal quality requirements have increased the demand...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a pulsed eddy current detection device and method for fatigue cracks of a large mine vibrating screen, to solve the problem that the existing fatigue crack detection method must be detected under the condition of a shutdown state and a damaged cladding layer, and the probe shakes The problem of reducing detection accuracy

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