过去轧钢用连续加热炉的均热段都设计成实底的,其目的在于消除纵水管造成的料坯下表面“黑印”,这个实底段叫“均热床”。两段炉子本来没有均热段,但为了消除“黑印”也没有实底段,习惯上也叫均热床,因为它起到了均匀加热料坯的作用。但实底段给炉子工作带来了缺点,即氧化铁皮与炉底耐火材料相烧结,造成了炉底逐渐上涨,所以要定期停炉打炉底,需要繁重的体力劳动,而且也降低了炉子作业率,影响产量。为了克服这些缺点,五十年代以来,国内外许多炉子实现了均热床架空,全部或部分的取消了实 In the past, the soaking zone of a continuous heating furnace for steel rolling was designed to be a real bottom. Its purpose was to eliminate the “black mark” on the lower surface of the preform caused by the longitudinal water pipe, which was called “soaking bed”. Two sections of the furnace had no soaking section, but in order to eliminate the “black mark” there is no real section, also known as the soaking bed, because it played a uniform heating of the role of the blank. But the real bottom of the work to bring the shortcomings of the furnace, that is, the oxide scale and bottom refractory phase sintering, resulting in a gradual increase in hearth, so regular shutdown furnace floor, requiring heavy manual labor, but also reduces the furnace Operating rate, affecting production. In order to overcome these shortcomings, since the 1950s many stoves at home and abroad have realized a hot bed blanket and all or part of them have been canceled