Device for preventing pulverized coal from flowing back at inlet of medium-speed coal mill

The utility model relates to the technical field of thermal power generation, and discloses a pulverized coal backflow prevention device at an inlet of a medium-speed coal mill, which comprises an air pipe, a backflow prevention component arranged in the air pipe and used for preventing pulverized coal from flowing back, a guide plate for guiding hot primary air, and a fixing sleeve fixed on the outer side of the air pipe, the protection part is arranged on the outer side of the fixing sleeve and used for protecting the air pipe; the backflow prevention assembly comprises an air outlet plate installed in the air pipe, an air outlet hole formed in the air outlet plate, a driving piece for guaranteeing circulation of hot primary air and a limiting piece for preventing pulverized coal from flowing back. The problems that coal dust in the coal mill enters an air pipe along with air flow, the coal dust in the air pipe is accumulated, the air pipe is blocked, and normal use of the coal mill is affected are solved.