Method for detecting coal-rock interface by phased-array ultrasonic imaging

Abstract

The invention relates to a coal-rock interface identification method, and particularly relates to a method for detecting a coal-rock interface by phased-array ultrasonic imaging. The method is realized by adopting a system for detecting the coal-rock interface on the basis of phased-array ultrasonic imaging. The system consists of a supporting device, a coupling device, an ultrasonic phased-array transducer and an imaging device. The phased-array transducer in water transmits ultrasonic waves to a coal bed, the ultrasonic waves enter the coal bed after being transmitted to a water and coal interface, then the ultrasonic waves are transmitted to the coal-rock interface and returned to the coal bed, and then the ultrasonic waves are returned to the water and received by the phased-array transducer. The thickness of the coal bed is calculated according to parameters such as the transmitting and receiving time difference of the phased-array transducer, and the coal-rock interface can be judged. By utilizing the advantages of the phased-array ultrasonic wave such as good directivity, high energy, high measurement precision and deflection focusing as well as the characteristic of the ultrasonic wave of no scattering in the water, the coal-rock interface can be precisely identified in real time, the method can be used for adjusting the cutting depth of a coal mining machine roller and reducing the residual coal bed, thereby reducing the coal loss to increase the coal exploitation quantity.

Description

technical field [0001] The invention relates to a coal-rock identification method, in particular to a method for identifying the coal-rock interface by an ultrasonic phased array in a coal mine fully mechanized mining face. Background technique [0002] The shearer is one of the main equipments of the comprehensive mechanized coal mining face. Realizing the automatic height adjustment of the shearer drum is not only an important link to realize the automation of the production process of the coal mining face, but also plays an important role in prolonging the life of the machine, improving the reliability and intelligence of the equipment. It is of great significance to optimize coal mining, reduce the thickness of residual coal seam and increase coal production. The key problem to be solved in the automatic height adjustment of the drum is the automatic identification of the coal-rock interface. Therefore, the coal-rock interface recognition technology is one of the key te...

AI Technical Summary

Problems solved by technology

However, due to the complex working conditions of the coal mine work site, there are many interference signals, and the vibration signals received by the sensor are not reliable.

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