Stem screening and conditioning device and method of using the same

A stem screening and conditioning device comprising:

• a roller provided horizontally in an axial direction, wherein a wall of the roller is provided with screen holes, the roller is provided with an open upper end and an open bottom end, and the roller rotates around the axial direction;
• a thermal insulation cover being roughly cylindrical and sleeved at a periphery of the roller in a sealed manner;
• a spiral feeding device entering from an upper end of the thermal insulation cover into the open upper end of the roller;
• a compressed-air cleaning device comprising a blowing tube and a compressed-air tank, wherein the blowing tube enters from a bottom end of the thermal insulation cover into the roller;
• a steam tube entering from the bottom end of the thermal insulation cover into the roller;
• a discharge hole provided at the open bottom end of the roller;
• and
• a waste hole provided on an outer wall of the bottom end of the thermal insulation cover.