Study On Automatic Control System Of Underground Roadway Drainage Network

Coal mine drainage system is an essential part of the whole production system of coal mine.Its efficient operation is very important for coal mine safety production.At present,there are many shortcomings in the drainage system of coal mine roadway: Tunnel water point is widely distributed and far away from the tunnel.Many coal mines,especially small and medium coal mines,still use relay control which the opening and stopping of the water pump and the monitoring of the water level are all done by manual work.The water quality of the underground is complex,and the water level sensor which can adapt to the complex water quality environment is lack in the water level measurement.The location of underground tunnel is narrow and the location of water points often needs to be changed,which requires higher requirements for miniaturization and integration of equipment.Therefore,improving the automation level of roadway drainage is of great significance to the economic efficiency and safety and efficient production of coal mines.Aiming at the existing problems of drainage system in coal mine,a set of automatic control system for roadway drainage network is designed,which integrates monitoring,early warning and communication control.The system's physical structure is compact,and the volume of the system is reduced.The function uses the integrated design of the main substation to realize the free handover of the monitoring station and the total monitoring station.It can make the site of any Ethernet under the shaft to connect the monitoring station to the Ethernet by switching the state of the main branch station.The STM32F407ZGT6 of Cortex-M4 processor is used in the monitoring site as the main control chip of the system.It is designed the hardware circuit of acquisition,control and communication to realize the acquisition of water level signal and water pump running state signal at the monitoring site and the control of automatic start and stop of water pump and alarm control of sound and light alarm.The network communication between CAN stations of different monitoring stations is realized,and the Ethernet network communication between the total monitoring sites and the ground monitoring center is realized.A capacitive mining especial water level sensor based on coaxial cable is designed.The special stainless steel weight column and coaxial cable are used as sensing parts.According to the principle of variable area,the capacitance is collected and the value of the actual water level is calculated by the CAV444 capacitance voltage conversion unit.Based on the connection characteristics of the upper computer software and the TCP/IP four layer architecture,the communication connection between the underground monitoring station and the ground computer is completed by the Modbus/TCP protocol.The upper computer interface is developed by using configuration software KingView,and the interface of general monitoring and monitoring station is designed.The underground monitoring station and the ground monitoring center can realize the communication of information,the uploading of the monitoring station data,the well setting and transmitting of the control instruction by the designed Ethernet channel.The automatic control system of underground drainage network has completed the design of underground monitoring station,and realized the automatic control of roadway drainage.The designed water level sensor can work stably and reliably under slime water or a lot of suspended solids.The ground monitoring system is developed by the configuration software KingView.Remote monitoring of monitoring sites is realized and the automation level of drainage is improved through network interconnection route.