The Research Of Coal Mine Dust Concentration Detection Technology

Coal mine safety in production is concerned by our country and the world, the rules on the coal mine safety production emerge in endlessly in recent years, but these measures did not meet expectations for the coal mine accident rate control. There are many factors influencing the coal mine safety accidents, one of the most serious factors is mine explosion triggered by mine dust concentration. So it is very important to control the coal mine dust concentration effectively.Dust concentration detection device detecting method is mainly studied, based on the characteristics of the coal mine dust particles, choosing the sampling method of light scattering method as a measurement of dust concentration. Under ideal conditions, the scattering light intensity is proportional to the dust mass concentration, so the scattered light intensity can be converted into electrical signals and the relative quality of dust concentration is calculated. Dust concentration detection device of the hardware system mainly includes the signal processing circuit, data acquisition circuit, controlling circuit,alarming circuit, serial interface circuit, power supplying system. The core component of the machine system is PIC16F877 low power consumption chip of the company. Subjects completed the dust concentration detection device of hardware circuit design, based on the principle of the detection circuit and sensor module data transmission protocol, using MCU C language program, completing the software design. The signal processing circuit design considering the characteristics of the sensor output signal adopt two-stage amplifier circuit,the amplifying circuit, the isolation amplifier circuit, completed jointly by operational amplifier chip OP27 and AD8221 Sensitive components choose GP2Y1010AU dust which is a sharp optical sensor, after external excitation output analog signal, analog signal through the high-performance AD7810 conversion, output data transmitted to the control unit MCU data processing and through the display shows the dust concentration. In addition, the PIC16F877 on-board resources have a active buzzer, when the dust density to limit, driving buzzer alarm indication syllable.The function of the dust concentration detection device: (1) the real-time on-line detection of the coal mine dust concentration (2) the dust concentration is too high will send alarm signal. Then test and analysis the device, and ultimately proved system can be real-time and accurate detection, mine dust concentration measurement error is very small,achieved good test result.