▎ 摘　　要

NOVELTY - The method involves installing a driving gear (6) on the motor shaft (9) and a transmission rack (5) on one end of the roller shaft (3). The left and right bearings (4, 7) ate mounted on both sides of the graphite roller (2) with transmission rack. The power is turned on, the motor is rotated, the motor and motor shaft drive the driving gear to rotate, and the driving gear drives the transmission rack to move back and forth, when ready. The graphite roller fixed on the drive rack moves back and forth on the lower glass plate (14), as the drive rack moves. A small amount of graphite powder stick to the glass plate, when the graphite roller rolls from one end to the other end of the glass plate, and among these small amounts of graphite powder, some are graphene with a few layers, and others are graphene with a single layer. USE - Preparation method for producing graphene crystals. ADVANTAGE - The method for preparing graphene is simpler, the cost is reduced, and the economic burden on users is reduced. DESCRIPTION OF DRAWING(S) - The drawing shows a front structural view of the device for producing graphene crystals. Graphite roller (2) Roller shaft (3) Left bearing (4) Transmission rack (5) Driving gear (6) Right bearing (7) Motor shaft (9) Lower glass plate (14)