Novel main branch air duct of continuous span type grain storage warehouse

The utility model discloses a novel main branch air duct of a continuous span type grain storage warehouse. The device comprises a main air duct and a plurality of branch air ducts, a section partition is arranged between two adjacent sections of air duct sheets in the main air duct; an opening communicated with the main ventilation cavity is formed in the section partition; the branch air ducts are matched with the wall surface to form branch ventilation cavities; cold air press-in pipes extending out of the tops of the grain piles are arranged at the tops of the branch air ducts; a movable cover for controlling the cold air press-in pipe to be opened or closed is arranged on the cold air press-in pipe; cold air in the warehouse can be downwards pressed into the branch ventilation cavities from the cold air pressing-in pipe and circulates in the main ventilation cavity by opening the cold air pressing-in pipe; compared with the prior art, according to the utility model, the warehousecan be used in summer; ai