Material from the feeding device into the inner rotary drum and achieve downstream drying. Material is stired up and down by the inner shovelling plate,sprial marching to achieve heat exchange. Material moves to the end of the inner layer into the middle, get counter -current drying. The material is constantly stired in middle, two steps forward one step back approach. In the middle, the material fully absorb the inner drum heat, while extending the drying time, the material achieve the best dry conditionj here. The material move to the end of the middle into the outer layer,and it marching in rectangular multi--loop methd. The material achieving the drying effect out of the drum fast under the action of hot wind, the wet material can't move rapidly due to the weight. So it can get dry enough in this rectangular shovelling plate, thus achieve the drying purpose.

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