| 摘要 |
<p>981,557. Cupola furnaces. F. ZWINZ. May 12, 1961 [May 17, 1960], No. 17361/61. Heading F4B. The upper part of a cupola furnace shaft is formed of segmental iron channels 3b defining with an outer shell 14 vertical air preheating passages feeding segmental ducts 9 and tuyeres 10 formed in the masonry 8. Each channel has side shelves 16 on which slide dampers 4 with external handles 15.</p> |
