The Rotary Cooler/Drum type Cooler is a large-scale machine that dissipates heat and reduces moisture from dried materials. This machine is one of the key equipment in the fertilizer industry. It is used to cool the formed fertilizer granules. When the temperature of the granules decreases, the moisture content decreases simultaneously, and the granule strength increases accordingly. The machine continuously pushes the air at normal temperature away from the tail of the cooling machine from the top of the head through the fan connected to the air outlet of the machine head. With the continuous rotation of the machine body, the internal lifting plate continuously lifts the formed particles, Throwing it down makes the material fully contact with the cold air to form heat exchange, so as to achieve the purpose of uniform cooling.