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Introduction Of Decoiler Machine

Decoiler is a hot or cold rolled steel rolled into a roll of rolling shop auxiliary equipment, in the hot strip mill (hot rolling unit), cold strip mill and wire rod mill on the finished product after the seat; in the single-seat reversible cold strip mill is installed in the front and rear of the mill. In addition, it is also installed in the continuous pickling unit, slitting, annealing, coating and other finishing units.


Cold, hot strip steel, wire rod due to the characteristics of the product section shape, it is possible to roll immediately after the rolled steel bent into a coil, which increases the weight of raw materials, improve the rolling speed, reduce the head and tail temperature difference provides a strong condition, which leads to the improvement of product yield and quality; in addition, the rolled material into a coil to facilitate transportation, which is the common characteristics and role of various forms of winding machine.

Decoiler Applications

Coiling machines are used in many industries. A winder is a machine that rolls products into coils. In terms of complexity, the metallurgical industry is represented by steel plate coiling machines. The winder is driven by electricity, fluids, etc. The general composition of the winder has core equipment reel (reel), auxiliary winding equipment (auxiliary forming equipment), help roll (forming roll), etc.

In the product winding process, the product is mainly formed on the reel, the reel is generally dragged by the motor, the auxiliary winding equipment help roll is generally used to rotate the motor drag, and the fluid hydraulic cylinder drives the help roll to move to help smoothly into the roll.


The winding machine is mainly used to wind long rolled parts into coils or plate coils. In modern cold-rolled strip shop, the coiling machine is also widely used in shearing, pickling, polishing heat treatment after grinding, tin plating and galvanizing, and other units. 

Due to the difference in process between strip production and wire production, cold strip production and hot strip production, the winder still has its own characteristics and functions, which led to their structural differences.


There are many types of winding machine, according to its use and structure can be divided into three types.

1) with tension reel winder usually in the cold state with tension conditions rolled steel plate or strip.

2)Roll winder for hot and cold rolled steel plates and strips.

3) wire rod and small section steel coiling machine. Coiling machine working principle

The winder with tension reel is used in reversible or irreversible cold rolled steel plate or strip rolling line.

This winder is not only used for rolling (unrolling) the rolled parts, but also make the rolled parts to produce tension, which is to make the rolling process to maintain stability, so that the plate rolled tighter, and make the rolled parts in the feeding rolls and rolled from the rolls in 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 rolling 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 decoiler before.

When rolling the first channel, the strip from the decoiler into the mill after the work rolls. With the pressure plate or roll guide plate pressed strip, resulting in little tension after rolling; then, the strip into the jaws of the winder reel, clamping the head of the strip for rolling, resulting in 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 changes in rolling speed and 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, the bracket supports the free end of the reel; and in the unloading, the bracket is turned to the side, does not hinder the unloading. Unloading volume, with pushing volume machine or pushing volume machine with unloading volume trolley, will be rolled out from the reel, and then transported away.

Winding machine failure repair method

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 to repair the main welding or brushing after machining, 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, cannot change the "hard to hard "In the combined effect of the forces, it will still cause re-wear.

Contemporary Western countries for the above problems more use polymer composite repair method, and more applications have Mega world technology products, which has a super strong adhesion, excellent compressive strength and other comprehensive performance.

The application of polymer material repair, not only 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.

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