Abstract: | The death rate per million tons in leading coal producing countries were compared and analyzed.In 2008,the death rate per million tons in China underground mine was 13.5 times of the USA,7.9 times of the South Africa,2.1 times of the Russia,0.97 times of the India.Through analysis,the reasons that million tons death rate in China was higher than other leading coal producing countries are due to:up to 95% of underground mining,poor storage conditions,severe disaster,lots of small coal mines,low degree of mechanization and informationize,etc.The characteristics of coal mine internet of things are proposed as follows:electric explosion protection,large wireless transmission attenuation,no GPS signal in underground mine,low wireless transmission power,strong anti interference and anti fault capability,suitable for using tree structure,long transmission distance,repeater is inappropriate to be used,small bulk of equipment,powerful adaptive capacity of network voltage fluctuation,be good at protection performance,etc.Put forward the key issues that need to be handled in coal mine internet of things:firstly,the standards of information coding,transmission,processing,etc;secondly,the mine used safety admittance products in whole control process,which involve production,transportation,storage,application and maintenance;thirdly,whole process manage and safe explosive control in production,transportation,storage,draw and return,usage,etc;fourthly,management and control of main equipments in whole course,production,transportation,storage,application and maintenance are included;fifthly,staff precise location,automatic identification and training,supervision;sixthly,coal gas examiner,safe inspector,fitter,blasting technician,winch man,shearer driver,water pump operator and their operation devices,man environment lock control;seventhly,ground remote control of unmanned working face;eighthly,management and control of coal at production,transportation,sales,usage;ninthly,management of emergency rescue equipment,ambulance corps,etc;tenthly,coal geological exploration,design,coal mine construction,safety production,management and administration. |