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Design of an instantaneous monitoring system of mine roadway section

LU Zhongliang;FU Teng;FU Tong;College of Safety Science and Engineering,Henan Polytechnic University;State Key Laboratory Cultivation Base for Gas Geology and Gas Control;Miyun Administration of Work Safety;  
Manual measuring method for mine roadway section is time-consuming and laborious with big error,and existing measuring instruments of roadway section are poor in measuring speed and cannot realize real-time monitoring by upper computer.A design scheme of instantaneous monitoring system of mine roadway section was proposed based on PLC and ZigBee network.PLC of the system outputs two high-speed pulse sequences at 6 400 bit/s to control stepper motor to rotate and drive pulsed laser rangefinder to range respectively. High-speed counters of HC0, HC1 count two pulse sequences respectively.Step angle of the stepper motor is 0.45°.After laser rangefinder rotates 360°,the PLC calculates perimeter and area of roadway section and sends the results to upper computer through ZigBee network for real-time display.The experimental results show that the system updates to display perimeter and area of roadway section every 10 seconds.Relative error of perimeter measuring is no more than0.5%,and the one of area measuring is no more than 0.9%.
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