| 摘要 |
To avoid reduction in efficiency of rough fragmentation operation with a rough fragmenting blade by making it difficult for fragments to stay in clearances between rough fragmenting blades of roughly fragmenting blade rotary structures so that rotation of the roughly fragmenting blade rotary structures is kept to the initial drive state. A roughly fragmenting blade (2) has a recessed portion (27) in a side surfac e of a roughly fragmenting blade main body having an outer peripheral edge formed with a blade portion (22). This recessed portion is formed in an annular manner in an intermediate region that is on the inner side in the radial direction with respect to the blade portion and is outside a bearing region. The recessed portion is for facilitating removal of cut fragments, i.e., for securing a clearance wider than the widt h of a cutting portion formed by the blade portions of the opposing roughly fragmenting blades when the roughly fragmenting blades are mounted to a roughly fragmenting blade rotary structure. The recessed portion is formed in one side surface or both side surfaces of the roughly fragmenting blade main body, depending on the construction and installment location of the roughly fragmenting blade rotary structure.
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