2021-4-24 · Design Of Spiral Drill Pipe Structure In Screw Miner. Screw miner is the key equipment in the production of coalwhich has great application prospects in coal mining in thin coal seam or coal seam mining.As the main component of helical blade of screw coal minerin this articlefirstlydrilling coal shearer spiral vane motor was analyzedand intensity checking is made to the helical vanefinally to ...