The winder with tension reel is applied to reversible or irreversible cold rolled steel sheet or strip rolling line. This winder is not only used to roll (unfold) the rolled parts, but also to make the rolled parts produce tension, which is to keep the rolling process stable, so that the plate rolled tighter, and make the rolled parts in the feeding rolls and rolled out from the rolls with the correct direction. In the rolling process, it is generally necessary to maintain a front tension and back tension. Relying on these tensions, you can reduce the pressure acting on the rolls when rolling, and reduce the warpage of the strip, which is conducive to improving the surface quality of the strip.
In the single-seat reversible cold mill, before and after the mill are equipped with tension reel winder, they alternately become active or passive; that is, a roll and the other unrolled. In continuous or irreversible single-seat cold rolling mill, only in the rear of the mill is equipped with a winder, the mill is equipped with an uncoiler before.
When rolling the first channel, the strip from the uncoiler into the mill after the work rolls. With the pressure plate or roll guide plate pressed strip, producing little tension after rolling; then, the strip into the jaws of the winder reel, clamping the head of the strip for rolling, producing the front tension. The disadvantage of reversible cold rolling is that both ends of the strip cannot be rolled. In order to reduce the amount of scrap consumption at both ends, often use a large diameter steel coil or welded lead strip at both ends of the strip.
Coiling machine in the process of rolling strip, steel coil diameter in the change, which causes constant changes in the coiling speed. In order to make the winding speed and rolling speed to adapt, as well as strip rolling to maintain constant tension, the requirements of the winder speed is adjustable, speed range should be adapted to the rolling speed changes and steel coil diameter changes, for this reason, the general use of adjustable speed DC motor drive.
At the end of the rolling, the steel coil to be unloaded from the reel, therefore, the winder reel must be made into a cantilever type. However, the reel is under a lot of tension to roll the strip, so the reel shaft should be subjected to a large load (including the weight of the reel, the weight of the strip roll, bending the strip and the moment caused by tension, etc.). In order to ensure the rigidity and strength of the reel shaft, reduce the bending of the reel shaft, in addition to increase the size of the reel shaft, – generally in the free end of the reel can be installed to rotate the bracket. When rolled strip, supporting the free end of the reel; and in the unloading, the bracket is turned to the side, does not prevent unloading. Unloading volume, with pushing volume machine or pushing volume machine with unloading volume trolley, will be rolled out from the roll, and then transported away.
Because the winding machine in the operation process to bear the moment or vibration is large, often cause transmission system failure, common bearing room, bearing bit wear and so on. After the occurrence of such problems, the traditional method of welding or brushing after machining repair, but both have certain disadvantages: welding easy to cause material damage, resulting in component deformation or fracture; and brushing and spraying often need to outsourcing, repair cycle is long, high cost, and the above two methods are used to repair metal metal, can not change the “hard to hard “The cooperation relationship, under the combined action of the forces, will still cause re-wear. Contemporary Western countries for the above problems mostly use polymer composite repair methods, and more applications have Runxiang machinery products, which has a super strong adhesion, excellent compressive strength and other comprehensive performance. The application of polymer material repair, both no welding heat stress impact, repair thickness is not limited, while the product has a metal material does not have the concession, can absorb the impact vibration of the equipment, to avoid the possibility of re-wear, and greatly extend the service life of equipment components, for enterprises to save a lot of downtime, to create huge economic value.
Post time: Feb-01-2023