Grain drying apparatus using exhaust heat of combine harvester

A grain drying apparatus using exhaust heat of a combine harvester, the apparatus comprising:

• an intake duct one end of which is connected to an exhaust port of the combine harvester and the other end of which outputs the hot air discharged from the exhaust port;
• a filter unit one end of which is connected to the other end of the intake duct for removing harmful components from the hot air;
• and
• an exhaust duct connected to the other end of the filter unit and a grain selection pan of the combine harvester and supplies the hot air from which the harmful components are removed to the grain selection pan of the combine harvester,
• wherein the intake duct comprises an intake connector for connecting to the exhaust port on the one end, and
• the exhaust duct comprises:
• a door for selectively opening or closing the intake duct;
• an actuator for driving the door;
• and a housing including the door and the actuator.