▎ 摘　　要

NOVELTY - The utility model claims a dynamic variable grading grinding device for graphene preparation, comprising a grinding device main body; the top end of the grinding device main body is provided with a driving mechanism; the output end of the driving mechanism is connected with a rotation axis, and rotation axis to the inner cavity of the grinding device main body; the inner cavity of the grinding device main body is equidistantly provided with a filter screen; the inner wall of the grinding device main body is symmetrically provided with a movable groove; the inner cavity top surface of the grinding device main body and the inner cavity top surface are provided with a concave mounting plate; and the rotation axis side of the concave mounting plate; the inner side of the concave mounting plate is slidingly connected with a connecting sliding frame; the connecting part of the connecting sliding frame and the filtering net is provided with a connecting rod; the inner side surface of the connecting sliding frame is provided with a first sawtooth; the inner side of the connecting sliding frame is provided with a turntable; and the turntable is fixedly sleeved on the outer part of the rotation axis; the surface of the turntable is provided with a second sawtooth matched with the first sawtooth; the turntable is set; It is good for accelerating the filtering efficiency of the filter screen, and improving the working efficiency of the device.