| 摘要 |
PROBLEM TO BE SOLVED: To provide a blanket fitting structure in which a blanket can be fixed to a head with a uniform force in the circumferential direction, and the sealability can be ensured sufficiently. SOLUTION: The blanket 4 is narrowly fitted between a blanket supporting surface 3A formed on the head 3 outwardly in the radial direction and a split ring 14 which is split into a plurality of arc-like ring pieces 15, and the blanket 4 is fixed to the head 3 by pressing the split ring 14 against the blanket supporting surface by a pressing means 17. Fitting structures 15A and 15B are formed on both ends in the circumferential direction of the ring pieces 15, and ends of the adjacent ring pieces 15 and 15 are fitted to each other when the blanket 4 is fitted to the head 3.
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