System of measuring coal leakage rate of gangue recovery based on X-ray method and alarming

Abstract

The invention relates to a system of measuring coal leakage rate of gangue recovery based on an X-ray method and alarming. A device is mounted on a gangue conveying belt and is composed of X-ray detection equipment and a counter. The X-ray detection equipment comprises an X-ray detection probe, a photodiode and a data acquisition card. The X-ray probe is connected to the photodiode, the photodiode is connected to the data acquisition card, and the data acquisition card communicates with the external counter. Different attenuation intensities of rays after gangue is detected by the X-ray probe are used to identify gangue; signals are converted and acquired through the photodiode and the data acquisition card, the gangue amount and the coal leakage are recorded in real time, and the coal leakage rate is obtained by means of additive operation and division operation of the counter; the coal leakage rate is compared with a set coal leakage rate threshold value; when the measured coal leakage rate reaches or exceeds the set coal leakage rate threshold value, an alarm indicating lamp on the counter will be turned on. The coal mixing rate in gangue during gangue recovery can be indirectly calculated by means of the device, and a function of alarming is achieved if the coal leakage rate exceeds the threshold value.

Description

technical field [0001] The invention relates to an X-ray-based method for measuring the coal leakage rate of gangue recovery and an alarm system, which is especially suitable for real-time detection of the coal inclusion rate in the gangue recovery process. Background technique [0002] There are many methods for separating coal and gangue, mainly including manual selection method, wind coal preparation method, fluidized bed coal preparation method, selective crushing method, ray penetration method and image processing method, etc., most coal preparation plants now use The method of moving sieve to discharge gangue sorts the gangue, and the coal content in the gangue after sorting is 5%-9%, and the economic loss of tens of millions of yuan can be caused by the enterprise due to coal leakage every year. It affects the coal recovery rate of the enterprise and greatly reduces the economic benefits of the enterprise. Moreover, if the gangue is recycled and transported to the ga...

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Problems solved by technology

[0002] There are many methods for separating coal and gangue, mainly including manual selection method, wind coal preparation method, fluidized bed coal preparation method, selective crushing method, ray penetration method and image processing method, etc., most coal preparation plants now use The method of moving gangue to sort out gangue, the coal content in gangue after sorting is 5%-9%, and the economic loss of tens of millions of yuan can be caused by coal leakage every year

Affect the coal recovery rate of the enterprise and greatly reduce the economic benefits of the enterprise

In addition, waste rock is recycled and transported to waste rock. If a large amount of coal is entrained, it will increase the risk of spontaneous combustion of waste rock and seriously affect the safety of people in mining areas.

[0003] Coal entrainment in gangue will waste precious coal resources, increase the difficulty of disposal of gangue, increase the risk of spontaneous combustion of gangue dumps, and run counter to the energy conservation and emission reduction advocated by the state

Therefore, it is very valuable to study the method of calculating the coal inclusion rate in the gangue and the technology of exceeding the threshold alarm during the gangue return process, but there is no such technology yet

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