Wear of driving sprocket for scraper convoy and mechanical behaviors at meshing progress

Over-wear is the major failure mode for driving sprocket on scraper conveyor,and there is interaction between mechanical behaviors and the wear of driving sprocket. Based on experimental and theoretical analysis,the character of worn sprocket and the difference of mechanical behaviors on the meshing progress between round link chains and worn and un-worn sprocket were studied. Scanned the sprocket chain nest with the flexible 3D scanner and analyzed the mechanical behaviors at the meshing progress between round link chains and sprocket. Scan results show that the directrix for worn sprocket chain nest is translated and the generatrix is deformed from circle to oral. Meshing researches show that the sliding distance between worn sprocket and round link chain is in liner to the wear loss. And the sliding distance is related to directrix. Based on above research,there is an advice to meet the necessary of stably meshing and lower wear rate,that is bigger angle γ at meshing-in stage and smaller angle γ at sliding stage for directrix.