Sieve tube for acidification

The utility model relates to a sieve tube for acidification. The device comprises a protective outer pipe, a screening inner pipe, a limiting clamping ring and a connecting flange, the screening innerpipe is installed in an inner cavity of the protection outer pipe. The limiting clamping ring is arranged between the screening inner pipe and the protecting outer pipe; connecting flanges are mounted at the two ends of the protective outer pipe through threads; according to the utility model, the outer wall of the screening inner pipe is provided with the limiting snap ring with a supporting function; the characteristic that a sliding ball in a limiting clamping ring can slide in an inner cavity of a fixed boss and on the inner side wall of a protective outer pipe is utilized; the screeninginner pipe is supported in the inner cavity of the protective outer pipe, meanwhile, adjustment of the position of the screening inner pipe in the inner cavity of the protective outer pipe is not affected, the screening inner