▎ 摘　　要

NOVELTY - The device has a grinding unit (2) whose outer wall is rotatably connected with a fixing shaft (21). The fixing shaft and a sliding block (6) are arranged in an axial elastic sliding fit. A discharge pipe is connected with an inner cavity and provided on an outer ball wall of a grinding box (1). A filter screen plate is provided at a position of an inner side of the discharge pipe. An axis of the discharge pipe is connected with an axis of a connecting column. A middle portion of a rolling disk is provided with a limiting sleeve. An outer wall of the discharge pipe is provided with a driving combination that is formed with a rolling disc (4). USE - Single-cavity efficient grinding device for preparing graphene. ADVANTAGE - The pressure of the contact is different when the grinding box rotates with the supporting upright post as the rotating shaft so as to convenient to repeatedly grind. The grinding efficiency is improved. The device has the function of transmission and labor-saving effect, and prevents overload. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a single-cavity efficient grinding device. Grinding box (1) Grinding unit (2) Rolling disc (4) Sliding block (6) Fixing shaft (21)