... motor 4,6mm,8mm,10mm,etc pellets wood pellet mill line: Main structure and working principle: 1,High efficient gear ... variable pitch anti coking arch structure . Speed adjusting control by frequency conversion8, Motor and gear shaft: new type falk flexible coupling ... and quenching , processed by hard gear surface technique. Stable transmission. Low noise. Long service life ModelCapacity(t/h)Power(kw ...