在下放或拆卸顶驱系统之前，要保证辊筒上留有足够的大绳圈数。
Prior to lowering the top drive system or rigging down, ensure that sufficient wraps of drilling line remain on the drum.
针对目前辊道窑存在的窑顶结构、砌筑材料、余热利用、燃空比等几方面所存在的问题，提出了相应的改进意见。
In this paper, problems in kiln roof, construction materials, residual heat and air-fuel ratio are described, and then Suggestions are put forward for their solution.
采取水基或无溶剂顶涂剂、辊涂技术则可减少整饰工段的污染。
Finally the technologies of water - based and solvent-free top coats, and roller-coating can reduce the pollution in finishing process.
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