Working principle of coiler
Release time:
2022/05/25 14:00
The coiler with tension reel is applied to reversible or irreversible cold rolled steel plate or strip steel rolling line. This coiling machine is not only used for coiling (unrolling) rolled pieces, but also to produce tension in the rolled pieces. This is to keep the rolling process stable, to make the plate coil tighter, and to make the rolled pieces in the correct direction when feeding into and out of the roll. During the rolling process, it is generally necessary to maintain a front tension and a back tension. Relying on these tensions, the pressure acting on the roll during rolling can be reduced, and the warping of the strip can be reduced, which is beneficial to improve the surface quality of the strip.
On a single stand reversible cold mill, coilers with tension drums are installed before and after the mill, which alternately become active or driven; that is, one coiling and the other unwinding. On the continuous or irreversible single stand cold rolling mill, only the coiler is installed at the rear of the rolling mill, and the uncoiler is installed in front of the rolling mill.
When rolling, the strip is fed from the uncoiler to the back of the mill work roll. Press the strip steel with a pressure plate or a roller guide plate to produce a small post-tension for rolling; then, the strip steel enters the jaw of the coiler drum, clamps the strip steel head for coiling, and produces a pre-tension. The disadvantage of reversible cold rolling is that the strip cannot be rolled at both ends. In order to reduce the consumption of scrap at both ends, large diameter steel coils are often used or welded at both ends of the strip.
In the process of coiling strip steel, the diameter of the steel coil is changing, which causes the continuous change of the coiling speed.
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