Coal mine advanced detection method for heading machine

Abstract

The invention discloses a coal mine advanced detection method for a heading machine. The method comprises the following steps: current generated by a current excitation source enters a coal seam through a movable cutting pick to form stray current when the heading machine tunnels; the stray current collected by a backflow net returns to a negative electrode of a power supply through a transition resistor, because the resistivity of the coal seam is related to the water content of the coal seam, when the water content of the coal seam and other information change, the stray current and the potential difference between the two ends of the transition resistor also change, and the water content information of the coal seam is converted into an electric signal; when the potential difference between the two ends of the transition resistor is applied to the two ends of a piezoelectric ceramic, the piezoelectric ceramic extends or compresses, and an electric signal is converted into a strain signal; a sensing optical fiber is extruded by the piezoelectric ceramic to convert the strain signal into an optical signal, the optical signal reaches a photoelectric detector through the sensing optical fiber, and the demodulated optical signal is analyzed to obtain coal seam water content information. The method can achieve the effect of real-time advanced detection of the water content of thecoal seam, and is high in anti-electromagnetic interference capability.

Description

technical field [0001] The invention relates to the technical field of coal mine well detection, in particular to an advance detection method for coal mine wells used in roadheaders. Background technique [0002] With the continuous improvement of safety requirements for coal mining, it is very important to know the coal seam structure and other information in advance when mining coal mines. The water-bearing structure, faults, fracture zones and other special geology in the coal seam are very prone to landslides and water seepage during mining. coal mine accident. Therefore, there is an urgent need for safe and reliable advanced detection equipment and methods to predict the coal seam information of coal mines and avoid the loss of personnel and equipment. [0003] When the structure or water content in the coal seam is abnormal, the resistivity of the coal seam will also change accordingly. The stray current passing through the coal seam can be used to effectively underst...

AI Technical Summary

Problems solved by technology

[0004] Traditional advanced detection methods mainly include geological prospecting and physical prospecting. Geological prospecting is labor-intensive, and technologies such as acoustic emission and geological radar used in physical prospecting are susceptible to electromagnetic interference and costly.

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