Research progress and development tendency of borehole drilling rod for soft seam

Accoding to the study and appicaion status of soft seam driWling rod based on th diferent illing rod mode and the dust removal dynamic mode.the pape inroduced the defmntion.applc ation scope, advantage and disadvantage.dust removal ynamic modelof the diferent drlling rod and analysed the development couse of sot caldrling rod. with the analysis on the study work of soft coaldrling.the paper pointed out the disadvantages of the study work. The study resulis of thesotcoal heology and the soft coal ilig theory were not tuficienty integrated. The studay work on the dust removal dynamics and coupling dust removal problem should be conducted deeply Theresistancereduction problem of the rod surface could not suficiently be in atention. A study on consolidation ofthe borehole wal in sof seam was slowly progressed. The inegrated prototyping techndiogy was to be promoted.Meanwhile,the paper pointed out the development tendency of the sot seam driling rod, including the muiti power coupling.multi structure coupling.nigh strength drillig rod.intelligent drilling rod and other orientation.