Mine alarm systems

Wang Q.Z. et al. 2008. Application Study of Mine Alarm System based on ZigBee Technology, Proceeding of the IEEE International conference on Automation and Eogistics, (ICAL2008), Qingdao, China. pp 2637-2540. 

A spring type clothespin is used to make a circuit clos ing switch to actuate explosive charges mines booby traps and alarm systems. 

Carbon monoxide is highly toxic because it has a higher affinity for hemoglobin than does oxygen. CO sensors are therefore of utmost importance for combustion control, fire-alarm systems, and detection of hazardous concentrations of the gas in private and industrial facilities such as tunnels, coal mines, and underground garages. The sensors in current use, in which CO is anodically oxidized or adsorbed onto coated piezoelectrodes, are relatively nonspecific, since H2S, N2O, and NO2 interfere. 

A suitable fire alarm system is a Mine Safety and Health Administration (MSHA) requirement. It is mentioned here because of its importance in emergency preparedness and in development of an emergency response plan. 

Improved sensors allow computer monitoring of the system for safety and protection of the equipment from damage. Sensors include lubrication-flow monitors and alarms, bearing-temperature sensors, belt scales, rotation sensors, and proximity sensors to detect ore level under the crusher. The latter prevent jamming of the output with too high an ore level, and protect the conveyor from impact of lumps with too low an ore level. Motion detectors assure that the conveyor is moving. Control applied to crusher systems including conveyors can facilitate use of mobile crushers in quarries and mines, since these can be controlled remotely by computer with reduced labor. 

Iron-nickel oxide batteries have been used for many years in railway lighting applications, and for motive power in industrial trucks, tractors and mine locomotives. There is some utilization of the system in emergency lighting and alarm circuits. 

Monitoring system requires for real-time monitoring on the mechanism of dynamic system, and processors are applied to collect data for analysis, judgment. When the clearance of brake-shoe exceeds the specified value or the symmetrical clearance of brake-shoe exceeds threshold value or hydraulic pump station works abnormal, various kinds of fault conditions can trigger alarm or forecasting warning. This has the following functions to the coal mine production work ... 

Coal mine safety monitoring system alarm status, inspection in accordance with the order of the substation within the transmission channel one by one inspection, the inspection period and the number of sub-station on that channel, sub-stations, the more the longer the inspection cycle. 

Groundwater hazard is one of the five major hazards in the coal product. Early warning system for groundwater hazard can monitor change of aquifers, and forecast the groundwater inrush from stratus, and give an alarm of groundwater hazard. It s very importance for safety of the coal mine production. 

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