Descaling apparatus

Patent metadata

Field	Value
Publication number	US-9321147-B2
Application number	US-201113701530-A
Country	US
Kind code	B2
Filing date	Jun 8, 2011
Priority date	Jun 9, 2010
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

Provided is a descaling device for effectively removing scale formed on a surface of a hot-rolled steel strip (steel sheet). The descaling device, for example, may be configured to include: a device housing disposed in a feed path of a hot-rolled steel strip, a high-pressure fluid supply unit provided to supply a high-pressure fluid to the device housing, an abrasive input unit provided to introduce an abrasive to the device housing, and an abrasive slurry spraying unit provided in the device housing to spray an abrasive slurry of the high-pressure fluid and the abrasive mixed inside the device housing on the steel strip.

First claim

The invention claimed is:

1. A descaling device comprising:
a device housing disposed in a feed path of a hot-rolled steel strip;
a high-pressure fluid supply unit provided to supply a high-pressure fluid to the device housing;
an abrasive input unit provided to introduce an abrasive into the device housing;
an abrasive slurry spraying unit provided in the device housing to spray an abrasive slurry having the high-pressure fluid and the abrasive mixed inside the device housing onto the steel strip; and
a mixing unit provided in the device housing to allow the high-pressure fluid and the abrasive to be smoothly mixed therein,
wherein the device housing comprises:
a first connecting portion connected to the high-pressure fluid supply unit;
a second connecting portion connected to the abrasive input unit; and
a spraying unit assembly portion having the abrasive slurry spraying unit assembled therein,
wherein the high-pressure fluid supply unit comprises:
a high-pressure fluid inlet provided inside the first connecting portion included in the device housing and having the high-pressure fluid supplied thereto; and
a high-pressure fluid nozzle provided to the high-pressure fluid inlet and having a nozzle hole formed therein to inject the high-pressure fluid into the inside of the device housing,
wherein a horizontal line at a lower end of the high-pressure fluid nozzle passes through a center point of an outlet of the inclined second connecting portion included in the device housing, and
wherein the mixing unit is provided as a fixed-type mixing unit formed of one or more grid units and one or more conical coils provided between the high-pressure fluid supply unit and the abrasive slurry spraying unit.

2. The descaling device of claim 1 , wherein the high-pressure fluid supply unit provided in the device housing provides the high-pressure fluid by injecting the high-pressure fluid inside the device housing, and is configured to smoothly introduce the abrasive into the inside of the device housing by using injection pressure of the high-pressure fluid.

3. The descaling device of claim 2 , wherein the abrasive input unit comprises an abrasive input hose connected to the second connecting portion included in the device housing, and a negative pressure space allowing the abrasive to be introduced into the device housing through suction by the medium of injection pressure of the high-pressure fluid is formed inside the device housing.

4. The descaling device of claim 1 , wherein the abrasive has a specific gravity lower than that of metal.

5. The descaling device of claim 4 , wherein the abrasive is formed of one of silicon oxide, silicon carbide, aluminum oxide, glass, or a ceramic having a particle diameter ranging from 10 μm to 400 μm.

6. The descaling device of claim 1 , wherein the high-pressure fluid is formed of high-pressure water injected through the high-pressure fluid nozzle in a pressure range of 100 bar to 500 bar, and a spacing between the abrasive slurry spraying unit included in the device housing and the steel strip is in a range of 100 mm to 350 mm.

7. The descaling device of claim 1 , wherein the abrasive slurry spraying unit comprises:
a spraying unit body provided in the spraying unit assembly portion included in the device housing;
a depressed portion formed in an upper portion of the spraying unit body; and
an abrasive slurry spray opening formed by penetrating through the body from the depressed portion.

8. The descaling device of claim 7 , wherein the depressed portion in the spraying unit body is concavely formed to have a conical shape from an upper end of the spraying unit body to an inner side thereof, and the spray opening is formed as a slit formed by integrally penetrating from a center of the conical depression portion to a lower end of the body.

9. The descaling device of claim 8 , wherein a cut portion having a predetermined angle through the spray opening is further formed at both sides of the lower end of the spraying unit body.

10. A descaling device comprising:
a device housing disposed in a feed path of a hot-rolled steel strip;
a high-pressure fluid supply unit provided to supply a high-pressure fluid to the device housing;
an abrasive input unit provided to introduce an abrasive into the device housing;
an abrasive slurry spraying unit provided in the device housing to spray an abrasive slurry having the high-pressure fluid and the abrasive mixed inside the device housing onto the steel strip; and
a mixing unit provided in the device housing to allow the high-pressure fluid and the abrasive to be smoothly mixed therein,
wherein the device housing comprises:
a first connecting portion connected to the high-pressure fluid supply unit;
a second connecting portion connected to the abrasive input unit; and
a spraying unit assembly portion having the abrasive slurry spraying unit assembled therein,
wherein the high-pressure fluid supply unit comprises:
a high-pressure fluid inlet provided inside the first connecting portion included in the device housing and having the high-pressure fluid supplied thereto; and
a high-pressure fluid nozzle provided to the high-pressure fluid inlet and having a nozzle hole formed therein to inject the high-pressure fluid into the inside of the device housing,
wherein a horizontal line parallel to and extending from a lower end of the high-pressure fluid nozzle and perpendicular to an outlet of the inclined second connecting portion included in the device housing passes through a center point of the outlet of the inclined second connecting portion, and
wherein the mixing unit is provided as a fixed-type mixing unit formed of one or more grid units and one or more conical coils provided between the high-pressure fluid supply unit and the abrasive slurry spraying unit.

Assignees

• Cho Soo-Hyoun
• Kim Tae-Chul
• Jin Young-Sool
• Posco

Inventors

• Cho Soo-Hyoun
• Kim Tae-Chul
• Jin Young-Sool

Classifications

• B21B45/06 Primary

  of strip material (B21B45/08 takes precedence) · CPC title

• B24C3/32 Primary

  designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks (B24C3/08, B24C3/18 take precedence) · CPC title

• B24C1/086

  Descaling; Removing coating films · CPC title

• B21B45/08

  hydraulically · CPC title

• B24C7/0084

  the abrasive material being fed in a mixture of liquid and gas (B24C7/0038, B24C7/0076 take precedence; blasting medium with additives B24C11/005) · CPC title