辊式入口导卫装置基本分为两类:两辊式和多辊式。两辊式导卫装置巳使用多年,很受欢迎。然而随着所使用的线-棒材连轧机组的增加,侧活套挑和上活套挑也开始使用。棒坯—与轧辊接触,便产生瞬间的停止运动,而随后部分继续以初始送进速度前进,由此,冲击作用将导致棒坯形成波浪形(图1 A)。 Roller entrance guard is basically divided into two categories: two-roll and multi-roll. Two-roller guide has been used for many years, very popular. However, with the increase of the line-bar rolling mill used, the side looper and the looper also started to be used. The billet - in contact with the roll - produces an instantaneous stop motion and then continues to advance at the initial feed rate, so that the impact will cause the billet to wavy (Figure 1A).