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Precise Looper Position Feedback

Loopers are normally used to control the tension of the metal strip between roll stands. The rotational angle of the looper is measured by a feedback encoder that is exposed to special demands. For this application Johannes Hübner Giessen developed a special looper encoder, which boasts a considerably longer lifetime thanks to especially designed-in features.

Home  Case Studies Precise looper position feedback

Rolling mills /Looper: Special looper encoders withstand the most extreme operating conditions in hot roll stands

Home    Case Studies    Pilger mill in tube rolling mills – hot and cold pipe detection

Pilger mill in tube rolling mills - hot and cold pipe detection

Special looper encoders withstand the most extreme operating conditions in hot roll stands

  • Subject to high loads from shock, temperature and cooling emulsions
  • Heavy-duty ball bearings with special lubrication
  • Increased lifetime
  • Reduced downtime

Loopers in hot rolling mills are working under extremely rough conditions.

Challenges

  • Loopers are normally used to control the tension of the metal strip between roll stands.
  • The rotational angle of the looper is measured by a feedback encoder that is exposed to special demands.
  • The setting angle up to only about 45° results in a partial load on the encoder bearings in conjunction with insufficient bearing lubrication.
  • The encoder is subject to high levels of shock and temperature loads as well as oil/cooling emulsions /water at the place of installation.
  • Formerly used standard encoders have not reached the required lifetime.

Looper encoder with heavy-duty ball bearings and special lubrication for long lifetime.

The Hübner Giessen solution

  • For this application Johannes Hübner Giessen developed a special looper encoder, which boasts a considerably longer lifetime thanks to especially designed-in features.
  • These contain oversized bearings with the dynamic load rating increased by 40% as well as a special radial shaft sealing ring with an additional protective lip.
  • To guarantee the best signal quality the bearings are not primarily designed for high speeds, but rather for high shock loads up to 450 g.
  • The min. degree of protection is IP66/ IP67 with an operating temperature up to 100 °C.

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Case Studies

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