US 12,240,023 B2
Flatness-measuring device, hot-rolling mill and method for operating a flatness-measuring device
Frank Gorgels, Aachen (DE); Olaf Norman Jepsen, Siegen (DE); Patrick Siemann, Kreuztal (DE); and Andreas Kastner, Kirchhundem (DE)
Assigned to SMS group GmBH, Düsseldorf (DE)
Appl. No. 18/023,582
Filed by SMS group GmbH, Düsseldorf (DE)
PCT Filed Aug. 12, 2021, PCT No. PCT/EP2021/072441
§ 371(c)(1), (2) Date Feb. 27, 2023,
PCT Pub. No. WO2022/043069, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 10 2020 210 970.2 (DE), filed on Aug. 31, 2020.
Prior Publication US 2023/0311182 A1, Oct. 5, 2023
Int. Cl. B21B 38/02 (2006.01); B21B 37/68 (2006.01)
CPC B21B 38/02 (2013.01) [B21B 37/68 (2013.01); B21B 2273/04 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A flatness-measuring device (1) for measuring flatness of a hot-rolled strip (2) within a hot-rolling mill, comprising:
deflection rollers (3, 5, 7), including
an entry-side deflection roller (3) for contacting a first large side of the hot-rolled strip (2),
an exit-side deflection roller (5) for contacting the first large side of the hot-rolled strip (2), and
a central deflection roller (7) arranged between the entry-side deflection roller (3) and the exit-side deflection roller (5) with respect to a strip running direction (6) of the hot-rolled strip (2),
wherein the central deflection roller (7) is placed against a second large side of the hot-rolled strip (2) opposite from the first large side of the hot-rolled strip (2), and
wherein the central deflection roller (7) is used as a flatness-measuring roller;
a sensing apparatus (8) for sensing an actual position (LIst) of the hot-rolled strip (2); and
an adjusting apparatus (9),
wherein the adjusting apparatus (9) is connected to the sensing apparatus (8) and to one of the deflection rollers (3, 5, 7), and
wherein the adjusting apparatus (9) is designed to vary an angle (α) between a longitudinal central axis (10) of the one of the deflection rollers (3, 5, 7) connected to the adjusting apparatus (9) and a longitudinal axis (11) of the flatness-measuring device (1) running transversely to the deflection rollers (3, 5, 7) based on a deviation of the actual position (LIst) of the hot-rolled strip (2) from a predefined target position (LSoll) of the hot-rolled strip (2).