To provide a grain drying machine capable of circulating and drying grain to a drying target moisture value while converging uneven moisture in the vertical direction generated by every accumulated layer within a prescribed width in charging the grain into a storage chamber.
This grain drying machine comprises an operation control portion 19 for successively drying the grain charged into the storage chamber 2 to the drying target moisture by a drying circulating operation for supplying dry hot air to a drying portion 3 along a set drying speed, wherein the operation control portion 19 performs loop measurement for measuring a moisture value of grain at a plurality of different timings according to the charging amount during one circulation of the charged grain of the storage chamber 2, grasps a degree of uneven moisture from the distribution Mn of moisture values in the vertical direction of the charged grain obtained by loop measurement, and calculates a scheduled circulation time H necessary for converging the uneven moisture to the prescribed width by the circulation of grain, and performs the drying circulating operation at a drying speed to reach the drying target moisture in the scheduled circulation time H.
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Maki Reiko
Kimio Kikutani