| 摘要 |
A grinding apparatus includes a frame, a first grinding assembly mounted on the frame for rotating about a vertical axis and a second grinding assembly supported on the frame and sleeved around the first grinding assembly. The first grinding assembly has a substantially truncated cone-shaped member with an external frusto-conical grinding surface. The truncated cone-shaped member is tapered upward. The second grinding assembly has an internal frusto-conical grinding surface to contact the external frusto-conical grinding surface of the truncated cone-shaped member for grinding. A driving device is provided for rotating the first grinding assembly about the vertical axis with respect to the second grinding assembly.
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