Coal-rock interface identification method, identification system and identification probe

Abstract

In an underground exploitation process of a coal mine, the coal recovery rate needs improving, and a roller bit of a coal mining machine is prevented from cutting roof strata as far as possible so as not to damage equipment or even cause accidents, so an interface of a coal layer and a rock layer needs on-line identification. The invention provides a coal-rock interface identification method, a coal-rock interface identification system and a coal-rock interface identification probe. A specific energy-level high-pressure water jet which can penetrate the coal layer but cannot penetrate the rock layer is jetted to the coal layer above a tunnel, different acting forces of reflected flow reflected by the coal layer or the rock layer on a nozzle are sensed in real time, and a controller judges the distance between the upper end of the roller bit of the coal mining machine and the coal-rock interface to realize automatic heightening control of a rocker arm of the coal mining machine so that the coal exploitation process realizes the goals of high recovery rate, low mechanical abrasion rate, automatic operation and the like. The coal-rock interface identification method, the coal-rock interface identification system and the coal-rock interface identification probe provided by the invention have the advantages of low cost, high adaptability, high reliability, intrinsic safety and the like.

Description

technical field [0001] The invention relates to a coal-rock interface identification method, an identification system and an identification probe based on the method. Background technique [0002] In the process of underground coal mining, it is necessary to distinguish the interface between the coal seam and the rock layer, and control the lifting of the rocker arm of the shearer based on this. [0003] At present, the control of the height of the domestic shearer drum is basically manual operation, that is, the driver of the shearer relies on his own vision and hearing to judge whether the drum has cut the roof rock and make corresponding adjustments. However, in actual operation, there is a certain distance between the driver’s eyes and the top of the drum, and the working surface is full of coal dust, so the visibility is extremely low; at the same time, the drum cutting the coal seam makes a lot of noise, and the coal seam is continuously scattered after being cut. Noi...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it will only take effect when the drum has cut to the rock formation, not only will it damage the cutter, but also the sparks generated by cutting the rock formation will pose a great threat to underground safety; in addition, the shearer drum is usually equipped with The spray device is used to cool the pick and coal seam, which also causes great difficulties in real-time and accurate measurement of the surface temperature of the geological body near the roller pick

In addition, there are some other methods such as: artificial gamma ray method, stress pick analysis method, vibration analysis method, etc. At present, they mainly stay in the theoretical research stage and have not yet formed practical technologies and products.

[0006] To sum up, so far, although researchers from various countries have put forward various ideas for coal-rock interface detection systems, most of the schemes are still in the research and test stage, and their reliability, practicability, and safety have not yet been fully verified.

At the same time, due to various reasons such as the complexity of geological conditions, the scope of use of some identification technologies that have been applied is severely limited, and the effect will become poor or even completely invalid if the use environment changes slightly. For example: natural gamma ray method, for shale roof Works well, but barely usable with sandstone roofs

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