Device and method for post-treating a metal strip

Patent metadata

Field	Value
Publication number	US-9534302-B2
Application number	US-201214351407-A
Country	US
Kind code	B2
Filing date	Oct 11, 2012
Priority date	Oct 14, 2011
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A device and method for post-treating a metal strip, wherein a pickled metal strip ( 2 ) coming from a pickling zone is advanced continuously through a rinsing zone ( 4 ) in which residues of a pickling agent adhering to the surface ( 11 ) of the metal strip ( 2 ) are removed by spraying the metal strip with rinsing fluid. At least one device ( 8 ) for generating a liquid mist ( 9 ) is provided in the rinsing zone ( 4 ). The device ( 8 ) can moisten the surface ( 14 ) of the metal strip ( 2 ) during an interruption of the continuous operation or of a sharply reduced speed of the strip. The device ( 8 ) has mist spraying jets above the surfaces of the metal strip.

First claim

The invention claimed is:

1. A device for post-treating a pickled metal strip comprising:
a device for advancing a pickled metal strip in continuous operation through a rinsing zone through which the pickled metal strip is advanced, the rinsing zone is comprised of a plurality of rinsing stages arranged in succession;
a spraying apparatus in the rinsing zone configured to remove residues of a pickling agent adhering to a surface of the metal strip by spraying a rinsing agent on the surface of the strip;
in response to an interruption in continuous operation or of a sharply reduced speed of advancing of the strip, the rinsing zone is configured to interrupt the spraying of the rinsing fluid zone-wise or completely;
a unit provided at least in one of the rinsing stages in the rinsing zone, for generating a liquid mist, and the unit is configured for moistening the surface of the metal strip; and
the unit comprises atomizing nozzles that generate the liquid mist, the atomizing nozzle being arranged at lateral sides of the at least one rinsing stage to introduce the liquid mist in a direction perpendicular to the direction of movement of the metal strip, toward the edges of the metal strip, and parallel to the opposing surfaces of the metal strip.

2. The device as claimed in claim 1 , wherein the unit is comprised of one or more spray nozzles each arranged at one of the sides of the respective stage.

3. The device as claimed in claim 2 , wherein the spray nozzles are arranged in a plane predefined by the pass line of advancing of the metal strip.

4. The device as claimed in claim 2 , wherein the spray nozzles are each arranged respectively above or below the pass line of advance of the metal strip.

5. The device as claimed in claim 4 , wherein the spray nozzles arranged in the unit are embodied as single-fluid nozzles.

6. The device as claimed in claim 4 , wherein the spray nozzles arranged in the unit are embodied as two-fluid nozzles.

7. The device as claimed in claim 2 , wherein the at least one rinsing stage has side walls at the lateral sides.

8. The device as claimed in claim 1 , wherein the spray nozzles are in at least one of above and below the advancing metal strip.

9. The device as claimed in claim 1 , wherein the at least one rinsing stage has side walls at the lateral sides thereof and the unit is located at the side walls.

10. A method for post-treating a pickled metal strip, comprising:
advancing the pickled metal strip to move in continuous operation through a rinsing zone and removing residues of a pickling agent adhering to the surface of the metal strip in the rinsing zone by spraying of rinsing fluid onto the metal strip;
in response to an interruption in the continuous advancing operation of the strip or of a sharply reduced speed of advancing of the strip, interrupting the spraying of the rinsing fluid zone-wise or completely; and
generating a liquid mist with a unit provided in the rinsing zone for keeping the surface of the metal strip moist at least when continuous advancing is interrupted or is at a reduced speed; and
introducing the liquid mist from lateral sides of the at least one rinsing stage in a direction perpendicular to the direction of strip advancement, toward edges of the strip, and parallel to opposing surfaces of the strip.

11. The method as claimed in claim 10 , wherein the rinsing zone is comprised of a plurality of rinsing stages, wherein at least in one of the rinsing stages, a section of the advancing metal strip then located in the at least one of the rinsing stages is additionally or alternatively kept moist by means of the liquid mist.

12. The method as claimed in claim 10 , further comprising generating the spray mist by spray nozzles which are arranged in a plane predefined by and above or below a pass line of advance of the metal strip.

13. The method as claimed in claim 10 , further comprising generating the spray mist jet by spray nozzles which are arranged in planes above and below the pass line of the advance of metal strip.

14. The method as claimed in claim 10 , further comprising introducing the liquid mist by means of single-fluid nozzles.

15. The method as claimed in claim 10 , further comprising introducing the liquid mist by means of two-fluid nozzles.

Assignees

• Siemens Vai Metals Tech Gmbh
• Primetals Technologies Austria GmbH

Inventors

• Hoedl Stefan
• Kofler Klaus
• Speidl Josef
• Stadlbauer Alois

Classifications

• B08B3/022

  Cleaning travelling work (B08B3/042 takes precedence) · CPC title

• B08B3/02

  Cleaning by the force of jets or sprays · CPC title

• C23G3/029 Primary

  for removing the pickling fluid from the objects · CPC title

• B08B3/041

  Cleaning travelling work · CPC title