Flatness-measuring apparatus for measuring the flatness of a metal strip

Patent metadata

Field	Value
Publication number	US-12036592-B2
Application number	US-202017621473-A
Country	US
Kind code	B2
Filing date	May 13, 2020
Priority date	Jun 25, 2019
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

A flatness measuring apparatus for measuring the flatness of a metallic strip, including a measuring roller which has a roller axis and which makes contact with the strip for the measuring the flatness. The measuring roller is connected to a cooling system, using which the measuring roller can be cooled. To ensure that a high degree of measuring accuracy can be maintained even at high temperatures, the cooling system has a nozzle bar that extends parallel to the roller axis. At least one spray nozzle is arranged on the nozzle bar, using which cooling medium can be sprayed on the surface of the measuring roller in a spraying direction. The spraying direction meets a surface section of the measuring roller, and the angle between the spraying direction and the tangent on the measuring roller at the location of the surface section is less than 30°.

First claim

The invention claimed is:

1. A flatness measuring apparatus for measuring the flatness of a metallic strip, comprising a measuring roller which has a roller axis and which is designed to make contact with the strip for the purpose of measuring the flatness, wherein the measuring roller is connected to a cooling system configured to cool the measuring roller, the measuring roller is designed as a deflection roller which is equipped with a sensor system that is configured to measure a radial force exerted by a tensile stress on the deflection roller, the flatness measuring apparatus is part of a hot rolling mill, and the cooling system comprises:
a first nozzle bar that extends parallel to the roller axis, wherein a first plurality of spray nozzles is arranged on the first nozzle bar and configured to spray a cooling medium on a surface of the measuring roller in a spraying direction, the spraying direction meets a surface section of the measuring roller, and an angle between the spraying direction and a tangent on the measuring roller at a location of the surface section is less than 30°,
a second nozzle bar, which extends parallel to the roller axis and is arranged offset to the first nozzle bar in the circumferential direction of the measuring roller, wherein a second plurality of spray nozzles is arranged on the second nozzle bar and configured to spray the cooling medium on the surface of the measuring roller in the spraying direction, and the angle between the spraying direction and the tangent on the measuring roller at the location of the surface section is less than 30°.

2. The flatness measuring apparatus according to claim 1 , wherein the angle is between 0° and 10°.

3. The flatness measuring apparatus according to claim 1 , wherein the spray nozzles are flat jet nozzles which emit a cooling medium jet that is at least 4 times as wide as thick.

4. The flatness measuring apparatus according to claim 3 , wherein the width of the jet of the flat jet nozzles extends in the direction of the roller axis.

5. The flatness measuring apparatus according to claim 1 , wherein the spray nozzles are aligned in such a way that the cooling medium is discharged against a running direction of the measuring roller.

6. The flatness measuring apparatus according to claim 1 , wherein the cooling system comprises a housing which encloses the nozzle bar or bars and a circumferential section, at least 180° of the circumference, of the measuring roller.

7. The flatness measuring apparatus according to claim 6 , wherein two gaps are formed between the housing and the measuring roller which make the passage of cooling medium difficult.

8. The flatness measuring apparatus according to claim 7 , wherein means for delivering a gas are arranged in the region of the gaps, to which a gas flow can be guided in the interior of the housing.

9. The flatness measuring apparatus according to claim 8 , wherein the means for delivering a gas comprise slot nozzles which extend in the longitudinal direction of the gaps, wherein the slot nozzles are integrated into the housing in the region of the gaps.

Assignees

• Sms Group Gmbh

Inventors

• Gorgels Frank
• Kastner Andreas

Classifications

• B21B45/0218

  for strips, sheets, or plates (B21B45/023, B21B45/0233 take precedence) · CPC title

• B21B1/24

  in a continuous {or semi-continuous} process {(B21B1/224 takes precedence)} · CPC title

• B21B37/28 Primary

  Control of flatness or profile during rolling of strip, sheets or plates · CPC title

• B21B38/02 Primary

  for measuring flatness or profile of strips · CPC title