| 摘要 |
Prism-shaped anvil blocks (10) are arranged about the inner circumferential wall (12) of a rotating shaft impactor chamber (14). Each anvil block has a planar face 16 oriented to receive material thereonto for breakage. The breakage face (16) of each anvil block (10) is not obscured (that is, shadowed) by an adjacent anvil block (10A), so that the trajectory of travel of material ejected from a rotor (18) is uninterrupted by the shape or position of the adjacent anvil block (10A), to reduce the unevenness of abrasive wear. Each anvil block (10) is retained at the inner circumferential wall (12) by a concealed post (24) which is located on a lateral, inwardly projecting peripheral ledge 26 of the chamber (14). Each post (24) is received in a respective mating cavity (28) formed in each anvil block (10). The ingress of any material into the small gap between the mating cavity (28) and the post (24) is substantially prevented by its concealment, thus avoiding jamming of the anvil.
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