The rotary drum cooling machine working principle is that under the action of cold air or ambient air, the material rolls in the rotating drum. The drum is set at a slight horizontal tilt to allow the material to pass through the cooling machine under gravity. During the drum rotation, the lifting plate maximizes the heat transfer efficiency by lifting the material and dropping it through the cold air.

Rotary drum cooling machine is an inclined horizontal rotary cylinder, with a supporting device, a transmission device, a cylinder and a sealing structure such as inlet and outlet device.

After the dried granular fertilizer entering the cooling machine from the feed tube, it rotates with the rotation of the cylinder. There are lifting plates inside the cylinder, so that the material is evenly spread downward to form a material curtain, and the cold air drawn from the head enters the machine and contacts with the material for heat exchange to cool it. The cold air brings the fertilizer’s heat out of the system, bringing its temperature down to below 40 degrees.