| 摘要 |
A grinding barrel has a grinding barrel body with a peripheral wall and a bottom wall, the peripheral wall defining an open top, a grinding barrel lid closing the open top and a grinding disk in the hollow interior of the barrel. The bottom wall has an upper surface, the grinding disk has a downwardly facing undersurface, and the upper surface and the undersurface are formed with mutually interengaged recessed and protruding surface portions shaped to allow the grinding disk to slide across the upwardly facing surface to the peripheral wall and to interfit with one another along a line of contact at central surface portions of the and the bottom wall and also at the periphery of the disk, thereby improving the grinding efficiency of the grinding barrel.
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