| 摘要 |
Fireproof plate, longitudinally round or oval in shape, provided with a shrink ring on the circumferential surface and improved by external shaping, an elliptical circumferential surface (15) being provided with a clamping surface (7), disposed on at least one side of the principal vertex, transversely to the principal axis (5) of the elliptical plate and bearing the clamping stress. This contributes to the prevention of cracks, and the service life is thereby extended.
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