Design Of Monitoring System For Leakage Of Coal Mine's Water-supply And Compressed-air-supply Pipeline Network Based On STM32F4

The water-supply and compressed-air-supply pipeline network system in the underground coal mine is the indispensable mechanical and electrical equipment in the link of coal mine production,which plays a very important role in maintaining the coal mine's production safety.The underground environment of coal mine is bad,and the phenomenon of pipeline leakage occurs frequently.Therefore,the real-time monitoring of the pipeline network is beneficial to ensure the safety of coal mine production.This thesis aims to solve the leakage monitoring problem of the pipeline in the underground coal mine.On the basis of the STM32F407 processor with Cortex-M4 as the core,it designs a set of signal-collecting and processing system,which supports multiple kinds of sensors.In comparison with the traditional acquisition system,which collects signals only for pressure and flow,it adds the acoustic signal collection,improves the accuracy of leakage location,solves the difficulty of time synchronization in the underground sub-station,and lays a foundation for leak location of the long-distance pipeline in the underground coal mine.The work of this thesis focuses on the design of pipeline network leakage monitoring sub-station.The main work and innovation are as follows:(1)It adopts the STM32F407ZGT6 chip with main frequency up to 168MHz.Aiming at the single sensor sampling problem of the traditional monitoring system,it designs a pipeline network leakage monitoring system,which integrates the signal collection,processing,storage,and data upload of multiple kinds of sensors to conduct real-time monitoring on the pipelines in the underground coal mine.(2)Aiming to solve the problem of large amount of sampling data,it designs an SD card storage circuit with 32GB capacity in the design of monitoring sub-station software with the support of the ?C/OS-? operating system.In this way,the original sampled data is stored in real time,compensating the shortcomings of traditional systems which cannot conduct offline local data storage for a long time.(3)It takes full advantage of the new DSP instruction set of the Cortex-M4,calculating the statistics of the root mean square,the maximum value,and the minimum value of the original sampling data set.Moreover,it increases the processing speed of the upper computer,and displays the sampling value and the waveform of each channel by adopting the advanced real-color liquid crystal screen so as to facilitate the observation of the underground personnel.Except that,it designs the touch-screen function to improve the human-computer interaction function.(4)Aiming at the problem that BDS and GPS signals cannot be received in coal mine,it researches the time synchronization algorithm.On the basis of the NTP protocol,the network timing of the coal mine's underground monitoring sub-station is carried out,and the local time of each underground operation sub-station is synchronized to solve the difficulty of the leakage location of the long-distance pipeline in the underground coal mine.In this thesis,the NTP protocol is applied to the time timing from the monitoring sub-station of the water-supply and compressed-air-supply pipeline network in the underground coal mine for the first time,which is of great significance to the leakage location of long-distance pipeline in the underground coal mine.Meanwhile,the function of monitoring sub-station is improved,which plays an important role in real-time monitoring of the underground coal mine pipeline network.In the laboratory environment,the pipeline network system is built to test the monitoring system so as to meet the design requirements.