| 摘要 |
PURPOSE:To separate the grinding chip from a pit to hold them inside of an outer barrel during the grinding. CONSTITUTION:The inner barrel 1, which has through holes 2 for passing the grinding chip in the side wall thereof, is provided inside of an outer barrel 3 to form the double structure barrel. In this double structure barrel, the inner barrel 1 is located inside of the outer barrel 3 freely to be disconnected, and plural inner barrel 1 are provided inside of the outer barrel 3. |
