Wiping device and hot dip coating apparatus using the same

Patent metadata

Field	Value
Publication number	US-9708702-B2
Application number	US-201214237660-A
Country	US
Kind code	B2
Filing date	Sep 21, 2012
Priority date	Sep 22, 2011
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A wiping device which blows a wiping gas toward a steel sheet from a pair of wiping nozzles disposed on both sides of the steel sheet so as to face sheet surfaces of the steel sheet, wherein the steel sheet is interposed between the pair of wiping nozzles and is pulled from a hot dip coating bath, the device includes a suctioning tube, wherein: the suctioning tube is disposed on both sides in a width direction of a section of the steel sheet, the section being positioned between the pair of wiping nozzles, so that the suctioning tube is in parallel to the steel sheet; the suctioning tube has a suctioning port that suctions an air; the suctioning port is disposed to face a side end surface of the steel sheet; a cross-sectional shape of the suctioning tube has the largest dimension thereof along a pulling direction of the steel sheet.

First claim

The invention claimed is:

1. A wiping device which blows a wiping gas toward a steel sheet from a pair of wiping nozzles disposed on both sides of the steel sheet so as to face sheet surfaces of the steel sheet, wherein the steel sheet is interposed between the pair of wiping nozzles and is pulled from a hot dip coating bath, the device comprising:
suctioning tubes, wherein:
the suctioning tubes are disposed on both sides in a width direction of a section of the steel sheet, the section being positioned between the pair of wiping nozzles, so that a longitudinal direction of the suctioning tubes is in parallel to the width direction of the steel sheet;
the suctioning tubes have a suctioning port that suctions an air;
the suctioning port is disposed to face a side end surface of the steel sheet;
a cross-sectional shape of the suctioning tubes has the largest dimension thereof along a pulling direction of the steel sheet and the cross-sectional shape of the suctioning tubes is selected from a group consisting of oval, rectangle and rhombus; and wherein:
the wiping nozzles are nozzles which have linear slits that extend over the width direction of the steel sheet;
the suctioning tubes are located between the wiping nozzles when seen in the width direction of the steel sheet;
in the suctioning tubes, a ratio of a long side of the cross section with respect to a short side of the cross section is 1.2 to 10;
a distance between the suctioning port and the side end surface of the steel sheet is 2 to 15 mm;
when seen in a direction perpendicular to the steel sheet, the suctioning tubes and the linear slit of the wiping nozzle overlap with each other;
the suctioning tubes optionally include a rectifying plate; and
the wiping gas that collides with the suctioning tubes is guided in a vertical direction along the suctioning tubes so that a generation of turbulence is prevented.

2. The wiping device according to claim 1 ,
wherein a width of the suctioning tubes in the pulling direction of the steel sheet is 15 to 50 mm.

3. A hot dip coating apparatus comprising:
a wiping device which blows a wiping gas toward a steel sheet from a pair of wiping nozzles disposed on both sides of the steel sheet so as to face sheet surfaces of the steel sheet, wherein the steel sheet is interposed between the pair of wiping nozzles and is pulled from a hot dip coating bath, wherein the wiping device comprising:
suctioning tubes, wherein:
the suctioning tubes are disposed on both sides in a width direction of a section of the steel sheet, the section being positioned between the pair of wiping nozzles, so that a longitudinal direction of the suctioning tubes is in parallel to the width direction of the steel sheet,
the suctioning tubes have a suctioning port that suctions an air,
the suctioning port is disposed to face a side end surface of the steel sheet,
a cross-sectional shape of the suctioning tubes has the largest dimension thereof along a pulling direction of the steel sheet and the cross-sectional shape of the suctioning tubes is selected from a group consisting of oval, rectangle and rhombus;
wherein the wiping nozzles are nozzles which have linear slits that extend over the width direction of the steel sheet;
the suctioning tubes are located between the wiping nozzles when seen in the width direction of the steel sheet;
in the suctioning tubes, a ratio of a long side of the cross section with respect to a short side of the cross section is 1.2 to 10;
a distance between the suctioning port and the side end surface of the steel sheet is 2 to 15 mm;
when seen in a direction perpendicular to the steel sheet, the suctioning tubes and the linear slit of the wiping nozzle overlap with each other;
the suctioning tubes optionally include a rectifying plate; and
the wiping gas that collides with the suctioning tubes is guided in a vertical direction along the suctioning tubes so that a generation of turbulence is prevented.

4. The hot dip coating apparatus according to claim 3 ,
wherein a width of the suctioning tubes in the pulling direction of the steel sheet is 15 to 50 mm.

Assignees

• Nippon Steel & Sumitomo Metal Corp
• Nippon Steel & Sumikin Coated Sheet Corp

Inventors

• Imai Takeshi
• Tamura Takeshi
• Sugiyama Seiji
• Miyamoto Kazuhiro
• Nishimata Mitsuo
• Yamane Yasushi

Classifications

• C23C2/003 Primary

  Apparatus · CPC title

• C23C2/20 Primary

  Strips; Plates · CPC title

• C23C2/16

  using fluids under pressure, e.g. air knives · CPC title

• C23C2/18

  Removing excess of molten coatings from elongated material · CPC title

• C23C2/14

  Removing excess of molten coatings; Controlling or regulating the coating thickness · CPC title