Tension roller set for a straightening system for straightening a strip...

A tensioning pulley set for a straightening line for straightening a strip or for a re-rolling stand for re-rolling a strip, the tensioning pulley set comprising:

• a first tensioning pulley having a first pulley axis, the first tensioning pulley being a flatness measuring pulley having a force sensor for measuring a radial force exerted on a circumferential surface of the flatness measuring pulley;
• and
• a second tensioning pulley with a second pulley axis, and a drive for the second tensioning pulley with which a torque can be applied to the second tensioning pulley on the second pulley axis;
• wherein either:
• the first tensioning pulley is configured without a drive;
• or
• an auxiliary drive for the first tensioning pulley is provided with which a torque can be applied to the first tensioning pulley on the first pulley axis, and wherein the auxiliary drive for the first tensioning pulley is weaker than the drive for the second tensioning pulley.

A straightening unit for straightening a strip, comprising:

• a. a front idler set;
• b. a front tensioning pulley set;
• c. a rear tensioning pulley set;
• d. a stretching zone between the front tensioning pulley set and the rear tensioning pulley set;
• and/or a bending stand between the front tensioning pulley set and the rear tensioning pulley set;
• wherein the front tensioning pulley set is a flatness measuring pulley having a force sensor for measuring a radial force exerted on a circumferential surface of the flatness measuring pulley.

A re-rolling stand for the re-rolling of a strip comprising:

• a. a front tensioning pulley set;
• b. a rear tensioning pulley set;
• c. a re-rolling stand provided between the front tensioning pulley set and the rear tensioning pulley set;
• wherein
• the front tensioning pulley set is a tensioning pulley set having a first tensioning pulley with a first pulley axis, a second tensioning pulley with a second pulley axis, a third tensioning pulley with a third pulley axis, a fourth tensioning pulley with a fourth pulley axis, and/or
• the rear tensioning pulley set is a tensioning pulley set having a first tensioning pulley with a first pulley axis, a second tensioning pulley with a second pulley axis, a third tensioning pulley with a third pulley axis, and a fourth tensioning pulley with a fourth pulley axis.

A method for operating a straightening plant for straightening a strip, comprising:

• providing a front idler set;
• providing a front tensioning pulley set having a first tensioning pulley with a first pulley axis, and a second tensioning pulley with a second pulley axis;
• providing a rear tensioning pulley set having a first tensioning pulley with a first pulley axis, and a second tensioning pulley with a second pulley axis;
• providing a bending stand between the front tensioning pulley set and the rear tensioning pulley set with adjustable bending rolls;
• measuring a radial force applied to a circumferential surface of a flatness measuring pulley associated with one of the front or rear tensioning pulley set;
• and
• controlling one or more of the adjustable bending rolls and front and rear tensioning pulley sets via a control device based on measurement results of the force sensor.