Material screening mechanism

The utility model relates to the technical field of emulsion explosive raw material processing, and discloses a material screening mechanism which comprises a first screening frame and a second screening frame, the first screening frame is detachably connected with the second screening frame, convex columns are symmetrically and fixedly connected to the edge of the bottom of the first screening frame, and the convex columns are detachably connected with the first screening frame. Concave holes are formed in the positions, corresponding to the protruding columns, of the top of the second screening frame, and the concave holes and the protruding columns form an embedded structure. The eccentric rotor is driven to swing through the power output end of the vibration motor, the sliding blocks are matched with the guide rods to slide under the elastic acting force of the springs, then the first screening frame and the second screening frame shake in the horizontal direction, secondary screening is conducted through