| 摘要 |
A wood chip cracking device (20) for use in papermaking employs closely spaced, oppositely rotating rolls (24, 26) which have pyramid-shaped projections (38) on the roll surfaces (32, 34). This chip destructuring apparatus (20) is rendered readily serviceable with minimal downtime by constructing the roll surface (32, 34) of removable segments (25) which are bolted to a central rotatable shaft (46). The segments (25) are sized so they can be lifted by a service man. As damage to the roll surface (32, 34), such as by exposure to tramp metal, is typically limited to a single segment, service and repair of the roll (24, 26) is expedited by permitting removal of a single damaged segment without removing the remaining undamaged segments (25). Each segment is bored for twelve bolts (72) and is affixed to the inner shell by twelve recessed bolts (72). The surface segments (25) allow the surface to be replaced without removing the rolls (24, 26) from the frame (30) of the wood chip cracking device (20).
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