Tensioning pulley set for a straightening line for straightening a strip, re-rolling stand line and method of operating a straightening line

A straightening unit for straightening a strip, comprising:

• a front tensioning pulley set;
• a rear tensioning pulley set;
• 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 and/or the rear tensioning pulley set comprises:
• 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 the first tensioning pulley is configured without a drive.

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 and/or the rear tensioning comprises:
• 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 the first tensioning pulley is configured without a drive.