End face dynamic sealing structure of mixing machine barrel

The invention relates to the technical field of mixing machines, in particular to an end face dynamic sealing structure of a mixing machine barrel, which comprises a mixing machine barrel and a barrel cover plate arranged on the upper end face of the opening part of the mixing machine barrel in a clearance manner, and an annular air cavity is arranged between the upper end face of the opening part of the mixing machine barrel and the lower end face of the barrel cover plate. An inner side annular sealing element and an outer side annular sealing element which are used for sealing the annular gas cavity are respectively arranged between the upper end surface of the opening part of the mixing machine barrel and the lower end surface of the barrel cover plate and are positioned on the inner side and the outer side of the annular gas cavity; and the annular gas cavity is communicated with a sealing protective gas supply source through an external pipeline. According to the invention, external ...