MZLH 42 wood pellet press: 1,for biomass fuel 2,ring die pellet mill 3, ... 4,6mm,8mm,10mm,etc pellets MZLH 42 wood pellet press: Main structure and working principle: 1,High efficient gear drive ... by frequency conversion8, Motor and gear shaft: new type falk flexible coupling, assemble and unassembled conveniently , reliable drive, high efficient.9 ...