Study On Monitor For Coal And Gas Outburst Based On Electromagnetic Emission

Coal and gas outburst is one of major accidents in the process of coal production. In recent years, with the continuous extension of the mine and the growing complexity of Mining conditions, The strength of coal and gas outburst and the result of casualties showed a growth trend. The main reason is that the prediction of coal and gas outburst still uses traditional methods such as drilling to get some reflection of face coal and gas outburst quantitative indicators to predict the risk. These means not only have a heavy workload, long forecast period, low reliability, but also take some time and space.Recently, there coal and gas outburst accident that have not exceeded the critical value of the predictors occurred over a hundred. The reason is that the gas outburst prediction method is static, not real-time monitoring of coal and gas to the dynamic changes. In order to solve these problems, a set of monitoring system that convenient to predict and forecast coal and gas outburst on the principle of coal and gas bursting accompanied by electromagnetic radiation was designed. In this paper the main research contents are summarized as follows.(1)According to the theory of electromagnetic radiation monitoring technology, the propagation and characteristics of electromagnetic radiation signals were given, and the need to measure the frequency and distance of the radiation signal was calculated. Finally, from the theoretical and technical point of view of this monitoring technology was feasible.(2) According to the monitoring requirements and the expected features of the system, the overall framework of the system was designed. With the forecast coal and gas outburst need for rapid, timely and accurate requirements, a dual CPU DSP+MCU architecture to monitor ideas was proposed. DSP is responsible for collection and processing of the signal that Coal and gas outburst electromagnetic radiation emitted. MCU is primarily responsible for the coordination of the entire instrument and Human-computer interaction function. From the measurement point of view, the principle of the various indicators and means of measurement has been studied in detail.(3)The monitor each functional module’s hardware circuit was designed in detail. The monitor’s hardware circuit consists of DSP and MCU circuits and their peripheral circuits. Part of the signal acquisition circuit includes sensor circuit, Signal conditioning circuit and A/D converter circuit. Data acquisition and analysis processing is completed by the DSP programming. It is worth noting that how to design a DSP and the MCU to communicate between the two dual-CPU control system is the key. In this paper DSP’s HPI is selected as Interface shared DSP memory to achieve fast communication with the MCU. MCU and its peripheral circuit contain the minimum system circuit, external data memory and I/O expansion circuit and the man-machine interface circuit. Man-machine interface circuit includes the LCD display circuit, keyboard input circuit, sound and light alarm circuit. In addition, MCU through RS-485driver connect to PC, uploading data for further processing and analysis.(4) The monitoring has been debugged in the laboratory.The results show that the system can run stably,data communication is reliable,sound-light alarm is in time.The debugging results show that the system can meet the functional requirements.