Interface structure of steel plate air duct with large section

The utility model provides an interface structure of a steel plate air duct with a large section. L-shaped inserting plates are added in the dual rectangular interface positions of the steel plate air duct; a steel plate in the horizontal direction of each L-shaped inserting plate is inserted into a dual rectangular interface, the width of the steel plate is consistent with the length of the dual rectangular interface and ranges from 15 cm to 35 cm, and the longitudinal length ranges from 80 cm to 120 cm; a steel plate in the vertical direction of each L-shaped inserting plate is suspended in the steel plate air duct, and the height of the steel plate is 1/15-1/12 of that of a pipeline; in the whole steel plate air duct, the L-shaped inserting plates are mounted at an interval of 60-100 cm; and the L-shaped inserting plates are made of the same material with the steel plate air duct. With the application of the interface structure of the steel plate air duct with the large section, the mechanical strength and