▎ 摘　　要

NOVELTY - The device has a separating cylinder (1) formed with a separating cavity. The separating cavity is divided into a discharging cavity and a filtering cavity along axial direction of the separating cylinder. A material pressing piston (2) is limited in the filtering cavity. A limiting piston (3) is limited in the discharging cavity. The pressing piston moves independently in the filtering cavity when axial distance between the pressing piston and the limiting piston is greater than a set threshold value. An end of a feeding pipe (4) is limited between the pressing piston and the limiting piston. USE - Device for separating and oxidizing graphene by a ceramic composite film. ADVANTAGE - The device can effectively avoid the limiting piston from the discharging cavity to conveniently and accurately switch to a state of the pressing piston independently moving. A telescopic piece is rotatably connected with the piston through a mounting plate to realize material stirring based on rotation of the telescopic piece in a process of moving the piston to conveniently realize fully separation of the material. A filtering and separating effect is good and efficiency is high. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a device for separating and oxidizing graphene by a ceramic composite film. 1Separating cylinder 2Material pressing piston 3Limiting piston 4Feeding pipe 5Telescopic piece 11First discharging port 12Second discharging port 13Ceramic composite film 14Sealing plug 31Limiting spring 32Limiting rod