Airflow heating assembly having a heating device and a container

An airflow heating assembly, comprising a heating device and a container, wherein the heating device is configured to heat air flowing there through to generate a hot airflow;

• the container is configured to receive a raw material;
• wherein the container is located above the heating device, the container defines a vent at a bottom thereof in communication with the heating device, and an inner wall of the container is sector-shaped with a larger upper portion and a smaller lower portion;
• the heating device comprises an outer heating pipe and an inner heating rod located in an inner cavity of the outer heating pipe, and a heating space is formed between an outer wall of the inner heating rod and an inner wall of the outer heating pipe;
• the air entering from a bottom portion of the heating device is heated in the heating space via the outer heating pipe and the inner heating rod to generate the hot airflow, and the hot airflow rises into the container and heat the raw material in the container.