US 2020/0047231 A1Published application

Descaling device and method for chemically descaling a metal strip

AssigneePrimetals Technologies Austria GmbH

InventorsKlaus KOFLER, Alois STADLBAUER

Life of this patent

Estimating the term…

Loading patent…

Abstract

A descaling device (2) for chemically descaling a metal strip (4): A spraying device (12, 12a-12d) for spraying a pickling agent (14) onto a top or bottom side (16, 18) of the metal strip (4). The spraying device (12, 12a-12d) has a first outer spraying unit (50) for spraying the pickling agent (14) onto a first edge region (52) of the top/bottom side (16, 18) of the metal strip (4) and a second outer spraying unit (54) for spraying the pickling agent (14) onto a second edge region (56) of the top/bottom side (16, 18) of the metal strip (4), which second edge region lies opposite the first edge region (52). At least one of the two outer spraying units (50, 54) has one or more solid stream nozzles (20), in particular a plurality of rows of solid stream nozzles (20), and/or one or more slotted nozzles (22).

Claims15

Dependent claims

A descaling device for chemical descaling of a metal strip, wherein the metal strip passes through the descaling device;

the metal strip having a first edge region and a second edge region extending inwardly from respective lateral edges of the metal strip passing through the descaling device;
the metal strip having a middle region situated between the first and the second edge regions of the metal strip;
the metal strip having a top side and a bottom side;
the descaling device, comprising:
at least one first spraying device and at least one second spraying device for respectively spraying a pickling agent onto a top side/bottom side of the metal strip;
each of the first spraying device and the second spraying device comprises a respective first outer spraying unit for spraying the pickling agent onto the first edge region of the top side/bottom side of the metal strip and a second outer spraying unit for spraying the pickling agent onto the second edge region of the top side/bottom side of the metal strip, wherein the second edge region of the metal strip is situated opposite the first edge region of the metal strip and extending inwardly from the respective lateral edges of the metal strip;
and
the first spraying device further comprises a middle spraying unit for spraying the pickling agent onto a middle region of the top side/bottom side of the metal strip, the middle region is between the first and the second edge regions;
at least one of the spraying units of the first/second spraying device comprises multiple rows of solid stream nozzles;
each of the spraying units of the first/second spraying device comprises its own respective pickling agent distribution chamber;
at least one of the two outer spraying units of the second spraying device comprises at least one slotted nozzle;
and
each of the two outer spraying units (50, 54) of the first and second spraying device devices comprises its own respective pickling agent distribution chamber.

10 more elements

A method for chemical descaling of a metal strip, comprising:

spraying a pickling agent onto a top side/bottom side of the metal strip by at least one first spraying device onto the top side of the strip and by at least one second spraying device onto the bottom side of the strip;
wherein the spraying of the pickling agent is by a first outer spraying unit of the first spraying device, and by a first outer spraying unit of the second spraying device onto a first edge region of the top side/bottom side of the metal strip;
and
the spraying of the pickling agent is also by a second outer spraying unit of the first spraying device and by a second outer spraying unit of the second spraying device onto a second edge region of the top side/bottom side of the metal strip wherein the second edge region is situated opposite the first edge region and, both of the first and the second edge region extending inwardly from respective lateral edges of the metal strip;
and
the spraying of the pickling agent is also by a middle spraying unit of the first spraying device onto a middle region of the top side/bottom side of the metal strip, wherein the middle region is situated between the first and second edge regions of the metal strip;
the spraying of the pickling agent onto the top side/bottom side of the metal strip is by at least one of the spraying units of the first spraying device through multiple rows of solid stream nozzles;
and
by the spraying by at least one of the two outer spraying units of the further spraying device through one or more slotted nozzles.

6 more elements

Dependencies are inferred from the claim text.