Grain-milling machine

A grain-milling machine comprising:

• a vertical abrasive grain-milling unit,
• a vertical friction grain-milling unit,
• a two-way grain feed trough, and
• a change-over valve located above the two-way grain feed trough, wherein
• the two-way grain feed trough is located above the abrasive grain-milling unit and the friction grain-milling unit,
• the abrasive grain-milling unit is located above the friction grain-milling unit,
• the abrasive grain-milling unit and the friction grain-milling unit are top-down vertical feed units,
• the abrasive grain-milling unit includes a milled grain discharge trough,
• the friction grain-milling unit includes a grain feed trough to which the milled grain discharge trough of the abrasive grain milling unit is connected, and
• the change-over valve selectively feeds grains in the two-way grain feed trough in a vertical feed direction either directly to the friction grain-milling unit or directly to the abrasive grain-milling unit.