Multi-stage screening device for nano calcium carbonate

The invention discloses a nano calcium carbonate multi-stage screening device, and relates to the technical field of calcium carbonate processing, the nano calcium carbonate multi-stage screening device comprises screening mechanisms, a feeding mechanism and a fan, the multiple screening mechanisms are arranged on a mounting frame from left to right, each screening mechanism comprises an inner barrel and a bracket which are fixedly mounted on the mounting frame, and an axial sliding groove is formed in the barrel wall of each inner barrel; a discharge port is formed in the cylinder wall of the inner cylinder below the sliding chute; an outer cylinder II is mounted on the bracket; a drainage cover is mounted at the lower end of the outer cylinder II; an outer cylinder I extending into a cylinder cavity of the outer cylinder II is mounted at the upper end of the outer cylinder II; according to the nano calcium carbonate screening device, through setting of the flow of the draught fan and design of the airflow d