Air supply device of rotary kiln

The invention discloses a rotary kiln air supply device which comprises an air supply system, a blowing system and a sealing device used for connecting and sealing the air supply system and the blowing system on a rotary kiln, and the sealing device comprises an air duct sealing ring, an annular air duct, a limiting assembly, a sealing assembly and a connecting assembly. The air duct sealing ring is connected to the periphery of the rotary kiln through the connecting assembly, the annular air duct is annularly arranged on the periphery of the air duct sealing ring, the annular air duct and the air duct sealing ring form an airflow channel, the air supply system supplies air to the blowing system through the airflow channel, and the blowing system supplies air to the rotary kiln. The sealing assembly is arranged at the joint of the annular air channel and the air channel sealing ring and used for sealing the airflow channel. The limiting assemblies are arranged on the two sides of the annular air channel and u