Hot air circulation drying equipment for polyester resin coating production

The invention relates to the related technical field of powder drying, discloses hot air circulation drying equipment for polyester resin coating production, and aims to solve the problem of uneven heating during drying of polyester resin coatings. The fan is used for conducting contact drying on the powder coating in the drying pipe, airflow output from the inner cavity of the drying pipe returns to the fan to achieve airflow circulation, and airflow waste heat loss is reduced due to the fact that the airflow output from the drying pipe is heated again; meanwhile, filter plates are arranged at the two ends of the drying pipe, powder in an inner cavity of the drying pipe is prevented from being input into a draught fan along with airflow through filtering of the filter plates, and when the filter plates are blocked, the draught fan can rotate reversely, so that the airflow direction in the inner cavity of the drying pipe is changed; and the effect of uniformly heating the powder coating through airflow circul