Square bottom valve bag surface hot air heating device

The utility model discloses a square bottom valve bag surface hot air heating device, which comprises an air heating mechanism, a switching mechanism, an air inflation mechanism and an air injection mechanism, the air heating mechanism is a circular barrel, and the air inflation mechanism and the air injection mechanism are respectively arranged at two ends of the air heating mechanism. The switching mechanism is a rotatable heat insulation plate, the air heating mechanism is divided into a plurality of fan-shaped sections through the heat insulation plate, a heating assembly is arranged in each section, and air heating is achieved through the heating assemblies; the air heating period is long, the requirement for air instantaneous heating is low, it is guaranteed that the temperature of sprayed hot air is consistent through preheating, the adhesion effect is good, and meanwhile the temperature of the sprayed hot air is convenient to control. 本实用新型公开了一种方底阀口袋表面热风加热装置，包括空气加热机构、切换机构、充气机构与喷气机构，空气加热机构为圆形的筒体，在空气加热机