Coal mine advanced detection method for heading machine

• Main Authors: XUE, Hongyu, ZHU, Zhencai, XING, Fangfang, SUN, Yanjing, PENG, Qiang, DONG, Feng, LI, Wei, CHEN, Guang, XU, Shaoyi
• Format: Patent
• Language: English
• Published: 08.07.2021
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

TEXT OF THE The present invention discloses a coal mine advanced detection method for a heading machine. The method includes the following steps: when the heading machine tunnels, a current generated by a current excitation source enters a coal seam through a movable cutting pick to form a stray current; 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 features such as a water content of the coal seam, when information such as the water content of the coal seam changes, the stray current and a potential difference across the transition resistor also accordingly change, and the coal seam water content information is converted into an electric signal; when the potential difference across the transition resistor is applied to two ends of a piezoelectric ceramic, the piezoelectric ceramic extends or compresses, and the 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 the coal seam water content information. The present invention can achieve the effect of real-time advanced detection of the water content of the coal seam, and the anti-electromagnetic interference capability is high.