Method for identifying coal gangue based on gamma rays

An identification method, γ-ray technology, is applied in the direction of material analysis using radiation, which can solve the problems of high labor intensity of opening and closing, poor working environment, etc., and achieve the effect of wide practicability, high accuracy, and improvement of harsh working environment

Inactive Publication Date: 2012-08-15
CHINA UNIV OF MINING & TECH
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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

Method used

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  • Method for identifying coal gangue based on gamma rays
  • Method for identifying coal gangue based on gamma rays

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Embodiment Construction

[0012] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0013] Such as figure 1 As shown, during the top-coal caving mining process, the coal seam 1 is below the rock layer 2, and the bottom coal of the coal seam 1 is cut by the coal shearer 4, and the top coal is supported by the hydraulic support 5. As the coal mining work proceeds, part of the rock layer 2 is broken It is gangue 3. Behind the hydraulic support 5, the top coal is released through the coal discharge port and falls on the scraper conveyor 6. Since part of the gangue 3 will be caught in the coal during the coal discharge process, during the coal mining process The content of gangue 3 must be controlled. Based on the difference between coal and gangue, the present invention adopts a dual-energy gamma-ray radiation source 7 composed of low-energy gamma-ray americium 241 and medium-energy gamma-ray cesium 137. After the rays emitted by the dual-ene...

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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...

Claims

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Application Information

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IPC IPC(8): G01N23/02
Inventor 刘长友张宁波卫建清鲁岩王飞龙刘长郄康庆涛
Owner CHINA UNIV OF MINING & TECH
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