Dustproof air type bus duct

The utility model relates to the technical field of bus ducts, and discloses a dustproof air-type bus duct comprising a lower limiting block, the left and right sides of the lower limiting block are fixedly connected with side panels, the bottoms of the side panels and the bottom of the lower limiting block are fixedly connected with lower connecting plates, the upper surfaces of the side panels are provided with upper connecting plates in an attached manner, and the upper connecting plates are fixedly connected with lower connecting plates. An upper limiting block is fixedly connected to the bottom of the upper connecting plate, the left side and the right side of the upper limiting block make contact with the side faces of the side panels, mounting grooves are formed in the bottom of the upper limiting block and the upper surface of the lower limiting block, and copper bars are arranged on the inner walls of the mounting grooves in an attached mode. Through cooperation of the cleaning brush, the transverse