Screening mechanism suitable for limestone

The utility model relates to the technical field of screening, in particular to a screening mechanism suitable for limestone, which comprises a shell component, a screening box is arranged at the top end of the shell component, an air box and a feed port are sequentially and fixedly mounted at the top end of the screening box from left to right, and a mounting plate is fixedly mounted at the top end of the back of the screening box. A servo motor is fixedly mounted on one side of the mounting plate, a plurality of roller shafts are movably mounted between the two walls of the top end of the interior of the screening box through bearings, the improved screening mechanism suitable for the limestone drives blades to disperse the limestone from a feeding port through rotation of the roller shafts, the problem that the limestone is stacked together is solved, and the screening efficiency is improved. Two sieving plates are turned over under meshing transmission of gears, limestone is discharged from a second disch