The Triple cylinder rotary dryer is divided into an inner cylinder, a middle cylinder and an outer cylinder. Multi-bent sand-raising board is evenly distributed in the inner layer of the drum, after the material enters the inner cylinder, it will be evenly dispersed and form the sand waterfall under the turning of the multi-fold sand raising board, and fully contact with the hot air. In the drying process, the materials will enter the middle cylinder of the dryer under the action of the inclined sand-raising board and the hot air, and the sand waterfall will be raised again by the serrated sand raising board to increase the contact area between the sand and the hot air for secondary drying. Finally, the dry sand will be exported through the inflow plate of the outer cylinder, and the inflow process is also the further drying of the material, thus ensuring the comprehensive drying of the sand.
