Gravity shredding device for coal powder dryer

A gravity shredding device for a coal powder dryer is formed in the way that a device for shredding blocked coal powder with gravity is added in the conventional coal powder dryer. The gravity shredding device comprises a coal-frying rotary drum, a coal-frying plate and a gravity shredding rack, wherein the coal-frying plate is positioned on the inner surface of the coal-frying rotary drum; the gravity shredding rack is mounted in the middle of the coal-frying rotary drum, and comprises more than two hard material gravity shredding arrays and a public shaft; each hard material gravity shredding array comprises a plurality of hard material bars or pipes that are arranged as per certain rules. Hard material gravity shredding arrays are mounted on the public shaft and are perpendicular to each other. When the coal at the bottom of the rotary drum is conveyed to the position near the top of the rotary drum through the coal-frying plate of the coal-frying rotary drum, the coal conveyed above the rotary drum is eje