| 摘要 |
A ladle preheat station including a wall (16), a ladle base (14) for holding a ladle (12) juxtapositioned to the wall (16) on one side thereof, and burner means (20) extending through the wall (16) for firing into the ladle interior (22). The wall includes a sight tube (30) extending therethrough. An infra-red pyrometer (28) is mounted and spaced from the side of the wall (16) opposite the ladle (12), and is positioned to receive radiation through the sight tube (30) from the ladle bottom (24) and is arranged to produce an electrical signal representative of the temperature of the ladle bottom (24) for control purposes. The sight tube (30) includes a Pyrex (Registered Trade Mark) lens (42) for protecting the pyrometer (28) from excessive heating by radiation from the ladle interior (22), and a purge system (34, 40, 44) is provided for passing air through the sight tube (30) to prevent contamination of the lens (42) by combustion products.
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