Double door-and-window shape silencing barrel end cover assembly

The invention discloses a double door-and-window shape silencing barrel end cover assembly. The double door-and-window shape silencing barrel end cover assembly comprises a silencing barrel. The flattened silencing barrel is a rectangular silencing barrel flattened sheet provided with a plurality of double door-and-window shape holes. The double door-and-window shape holes comprise rectangular sound passing holes formed in the silencing barrel flattened sheet. Beams are arranged in the sound passing holes. The axis of each beam coincides with the connecting line of the middle points of the opposite edges of the corresponding sound passing hole. The two sides of each beam are connected with a flange A and a flange B. Each beam divides the corresponding sound passing hole into two equal-area and symmetrical through holes. An acute angle A is formed by each flange A and the silencing barrel flattened sheet, an acute angle B is formed by each flange B and the silencing barrel flattened sheet, the area of each flange A is equal to the area of the area of the sound passing hole in the left side of the corresponding beam, and the area of each flange B is equal to the area of the sound passing hole in the right side of the corresponding beam. The double door-and-window shape silencing barrel end cover assembly has the advantages of being simple in structure and high in anti-noise capacity.