目前广泛应用于热轧带钢车间的三辊地下式热带卷取机主要依赖国外进口 ,或引进国外技术在国内配套制造 ,对其设计机理尚未进行深入研究。结合国家攻关项目要求对夹送辊的直径选取方法进行了探讨 ,利用弹塑性弯曲变形的相关理论 ,给出了相应的计算公式。结果表明 ,所述方法与实际吻合 ,为今后卷取机的国产化提供了理论依据。 At present, the three-roller underground coiler, which is widely used in the hot-rolled steel strip workshop, mainly relies on foreign imports or the introduction of foreign technology to manufacture in the country. The design mechanism has not been studied thoroughly. In combination with the requirements of national research projects, the selection of the diameter of the pinch rolls is discussed. The corresponding formulas are given by using the relevant theory of elastic-plastic bending deformation. The results show that the method is in line with the actual situation, which provides a theoretical basis for the localization of coiler in the future.