Vertical sieve plate cap suitable for cast iron tower tray

The utility model relates to a vertical sieve plate cap suitable for a cast iron tower tray, belonging to the technical field of water treatment. According to the technical scheme, the vertical sieve plate cap comprises a cap body, a cross-shaped bracket and a screw rod, wherein two nuts are screwed at the two ends of the screw rod; the cap body is supported on the cast iron tower tray by a plurality of support legs around the side wall of the cap body and just covers a corresponding steam raising pipe; a plurality of sieve meshes are evenly distributed in the upper part of the side wall of the cap body; the cross-shaped bracket is flatly attached to the lower surface of the cast iron tower tray and is opposite to an air inlet of the steam raising pipe; the screw rod is arranged in the steam raising pipe of the cast iron tower tray and is coaxial with the steam raising pipe; the upper end and the lower end of the screw rod pass through center holes of the cap body and the cross-shaped bracket, and are then sc