| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable the degradation of a chimney lining to be checked at any time and reduce the work of an operator. SOLUTION: A simple hood 20 is reversedly provided inside a chimney 1 such that gas flowing through the chimney 1 is prevented from flowing into the simple hood 20 and from flowing out of the chimney 1. Therefore, an operator can pick a lining core 1B without being exposed to the gas even while the chimney is smoking by operating a coring unit 30, which is reversedly provided in the simple hood 20, from outside the chimney 1.</p> |
