Spring Coiler During The Rolling Process
Spring Coiler During the rolling process
Coil reel with tension reel is used in reversible or irreversible cold rolled steel or strip rolling lines. This coiler is used not only for coiling (unwinding) rolling but also to produce tension in the rolling, in order to keep the rolling process stable, to make the coil more tight and to allow the roll to be fed And the direction of rolling from the roll in the right direction. In the rolling process, it is generally necessary to maintain the front tension and the rear tension. Depending on these stresses, it is possible to reduce the pressure acting on the roll during rolling and to reduce the warpage of the strip, which is conducive to improving the surface quality of the strip.
In a stand-alone reversible cold rolling mill, both sides of the mill are fitted with coiling machines with tension reels, which alternately become active or driven; that is, one is coiled and the other is unfolded. In a continuous or irreversible stand-alone cold rolling mill, only the bottom of the mill is equipped with a coiler, and the mill is equipped with an unwinder.
When rolling first, the strip is fed from the unwinding machine into the mill roll. Pressing the strip with a platen or a roller guide to produce little back tension for rolling; then, the strip enters the jaws of the reel spool, and the strip is gripped to produce the front tension. The disadvantage of reversible cold rolling is that both ends of the strip can not be rolled. In order to reduce the consumption of waste at both ends, often use large diameter coil or strip at both ends of the welding lead.
Coiler In the process of winding the strip, the coil diameter is changing, which causes the coiling speed to change constantly. In order to adapt the coiling speed to the rolling speed and to keep the tension constant during the strip rolling, the speed of the coiler is adjustable and the speed range should be adjusted to the rolling speed variation and the coil diameter change. , The general use of adjustable speed DC motor drive.
After the rolling is finished, the coil is unloaded from the spool, so the winder drum must be cantilevered. However, the reel is wound with a large tension under the belt, so that the reel shaft will bear a lot of load (including the weight of the reel, strip weight, bending steel and tension caused by the torque, etc.). In order to ensure the rigidity and strength of the spool shaft, to reduce the bending of the spool shaft, in addition to increasing the size of the spool shaft, the free end of the reel can be installed in the bracket. When winding the strip, the support of the free support of the reel; and in the unloading, the bracket turned - next, does not prevent unloading. When unloading the roll, push the coil from the roll and push it out by pushing the roll machine or the roll unit with the unloading car. Figure 9-2 is a schematic diagram of the roll. It consists of hydraulic cylinder 1 and push plate 3. Push-roll machines are generally located under the reel, and its stroke is controlled by limit switches. The push plate itself is a trolley that can run back and forth along a track parallel to the reel.