Guiding rolls with proportional and/or integral positioning behavior

The EMG SRD guiding rolls are used to bridge different strip heights. One possible application position for the SRD guiding roll is between the strip storage and strip processing. A major advantage of this purely proportional guiding roll type is the minimal space required by the guiding rolls. In addition, the guiding rolls have low edge stress, which means that very short infeed and outfeed distances are possible.

The guiding rolls rotate around a certain pivot point and the incoming strip section is thus shifted sideways. In the event of errors in the strip run, the guiding rolls correct the strip position in this way and return the strip to the predetermined point in the system. The strip running correction is proportional to the travel of the positioning frame. The incoming and outgoing strip forms a right angle with the swivel plane. The maximum correction capacity depends on the distance between the incoming and outgoing strip level.

Customer benefits:

• Minimal space requirement 
• Easy to maintain
• Correct positioning of the strip run
• Stability & durability

Integrally acting guiding rollers can be used if strip guiding is planned after a longer infeed section.

The rotating axis of the guide roll is vertical to the incoming strip direction. The angular displacement of the roll towards the incoming strip creates the steering effect. This wrapping effect at the steering roll keeps the strip in the centre position and is stopped when the roll axis and the strip axis of the incoming strip forms a right angle.

With a pure steering guide, for example end pivot or centre pivot type frames, overshoot and oscillation of the roll may occur. For that purpose, the EMG electronic feedback system guarantees a stable operation without overshoot.

The function of the SRH steering unit is to feed the strip in a well centred manner into the strip accumulator.

Following travel over a long free strip entry span, major strip deviations may be corrected on a 90° deflector roll equipped with this guiding system, making use of the advantages of the wrapping effect. For the exit span, twice the maximum strip width is sufficient. In the case of long entry and exit span, the system can also be used together with a 180° deflector roll.

The tilting frame with its deflector roll is guided by two steering levers so that a suitable combination of the angle between the strip and the roll axis (I portion) and lateral displace-
ment of the strip (P portion) is achieved. In addition to obtaining the exact position of the strip at the exit, a centring effect is also achieved at the entry span.