Abstract: Combined with the performance parameters of the cold rolling continuous annealing unit in the production of strip steels in Qiansteel, both the diameter, the material, the strip cladding angle and the tension amplification coefficient of No.1 tension roller in the entrance section of the unit, and the relevant parameters of reducer, drive motor were designed and accounted in this paper. The results showed that the checked power of the motor met the actual needs of production, which can provide reference to the design of similar units.

Key words: tension roller, design and calculation, tension, power