Method for identifying coal gangue based on gamma rays

Abstract

The invention discloses a method for identifying coal gangue based on gamma rays. Double-energy gamma rays consisting of low-energy americium 241 gamma rays and moderate-energy cesium 137 gamma rays are adopted; and when the double-energy gamma rays penetrate through a coal gangue mixture, the attenuation degree of the low-energy americium rays is only related with coal gangue mixing degree, thickness, bulk density and the like of the coal gangue mixture, and the attenuation degree of the moderate-energy cesium gamma rays is only related with the bulk density and the weight of the mixture. The gangue rate of the coal gangue mixture is calculated according to the attenuation degrees of the two kinds of rays. A double-energy gamma ray source and a gamma ray probe are respectively arranged on two sides of a chute of a scraper conveyor in the back of a top coal caving support; a data analyzer is used for calculating the gangue rate of the coal gangue mixture according to the intensity information of the gamma rays detected by the probe and comparing the gangue rate with a set gangue rate threshold value; and when the gangue rate reaches or exceeds the set gangue rate threshold value, a coal discharge window is closed through an electro-hydraulic control system to stop discharging coal, so that automatic control of coal discharge is realized.

Description

technical field [0001] The invention relates to a gamma-ray-based coal gangue identification method, which is especially suitable for real-time monitoring of the coal gangue mixing degree of the coal gangue flow. Background technique [0002] Fully mechanized top coal caving mining technology is one of the most effective methods to realize efficient and intensive production of thick and extra thick coal seams, and coal caving technology is the core of fully mechanized caving mining. The key to the automation of the fully mechanized mining face is no longer the automatic height adjustment control of the shearer in the traditional fully mechanized mining face, but the electro-hydraulic control of the hydraulic support, especially the electro-hydraulic automatic control of coal caving. With the improvement of output and automation level of fully-mechanized caving face, manual visual inspection to judge the level of top-coal caving and manual control of the opening and closing o...

AI Technical Summary

Problems solved by technology

With the improvement of output and automation level of fully-mechanized caving face, manual visual inspection to judge the level of top-coal caving and manual control of the opening and closing of coal caving port are labor-intensive and the working environment is poor, so it is no longer suitable for the operation of electro-hydraulic top-coal caving support.

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