For the first time involved in grain drying customers, for the grain drying equipment is not a lot of understanding, in fact grain dryer is now highly mechanized and automated, for manual technology and working hours require a low, and more than three drum drying Machine-based, plant area is not demanding, saving customers land rent and venue, heating fuel costs are low. The operation principle of the drum grain drying equipment is simply summarized as follows: the grain is conveyed by the feeder to the inner cylinder of the drum. After the three drying areas of the guide area and the material curtain area and the fast transit area, the heat exchange is carried out with the heated air, So as to achieve drying. The three-layer drum dryer adopts the new type of hopper device and the spiral belt conveying structure, which greatly improves the heating efficiency of the wet sawdust and accelerates the drying. In the middle drying area, the wet grain can receive from the inner tube and the middle hot air two Heavy heat, whether it is drying rate or quality have been greatly improved. The entire drying process has high heat utilization and high drying quality, while also reducing heat loss and reducing fuel costs. The three-layer drum dryer structure compared to single-cylinder dryer more area-saving, customers in the plant planning and cost control more freedom.