Sieve hole positioning and punching device of automatic sieve

The utility model discloses an automatic sieve mesh positioning and punching device, which relates to the technical field of automatic sieve plate processing and comprises a base, a support table is fixedly arranged at the top end of the base, top plates are fixedly mounted on two sides of the top end of the base through fixing frames, and a punching cylinder is fixedly arranged in the middle of the top end of each top plate. A lower pressing plate is fixedly arranged on a piston rod of the punching air cylinder, a mounting column is fixedly arranged in the middle of the bottom end of the lower pressing plate, a mounting plate is fixedly arranged at the bottom end of the mounting column, and a punching plate is fixedly arranged at the bottom end of the mounting plate; the screening device has the advantages that the limiting disc can be driven to spirally move downwards through threaded fit of the limiting screw and the threaded seat, screening plates on the supporting table are limited, the screening device