Rolling mill roll-cleaning device and cleaning method

Patent metadata

Field	Value
Publication number	US-9433986-B2
Application number	US-201213982006-A
Country	US
Kind code	B2
Filing date	May 15, 2012
Priority date	May 16, 2011
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

Generation of cavitation jet in air on a surface of a work roll provides a higher cleaning force than squirting of only high pressure fluid, so that sticking substances on the surface of the work roll are reliably removable. When a distance between a cleaning nozzle and the surface of the work roll and pressure of the high pressure fluid are controlled within a predetermined range, sticking substances are efficiently removable while roughness of the surface of the work roll is maintained.

First claim

The invention claimed is:

1. A cleaning device for a rolling roll, the cleaning device comprising a cavitation nozzle that is used for cleaning a work roll used in a rolling mill, wherein
in order to clean zinc adhered to a surface of the work roll while keeping surface roughness of the work roll,
a distance X between a tip end of the cavitation nozzle and the surface of the work roll is set in a range of 30 mm to 40 mm;
a pressure PH of high pressure fluid squirted from the cavitation nozzle is set in a range of 20 MPa to 40 MPa;
a pressure PL of low pressure fluid squirted from the cavitation nozzle simultaneously with the high pressure fluid is set in a range of 0.03 MPa to 0.07 MPa; and
the pressure PH of the high pressure fluid satisfies PH≦0.5X+20.

2. The cleaning device for a rolling roll according to claim 1 , wherein
the cavitation nozzle comprises a first nozzle and a second nozzle,
the high pressure fluid is squirted from the first nozzle, and
the low pressure fluid is squirted from the second nozzle simultaneously with the high pressure fluid.

3. The cleaning device for a rolling roll according to claim 1 , wherein
the cavitation nozzle comprises a first nozzle and a second nozzle, the second nozzle surrounding the first nozzle,
the high pressure fluid is squirted from the first nozzle, and
the low pressure fluid is squirted from the second nozzle simultaneously with the high pressure fluid.

4. A method of cleaning a work roll of a rolling roll using a cavitation nozzle, the method comprising:
setting a distance X between a tip end of the cavitation nozzle and a surface of the work roll at a predetermined distance in a range of 30 mm to 40 mm;
setting a pressure PH of high pressure fluid squirted from the cavitation nozzle at a predetermined value in a range of 20 MPa to 40 MPa;
setting a pressure PL of low pressure fluid squirted from the cavitation nozzle simultaneously with the high pressure fluid at a predetermined value in a range of 0.03 MPa to 0.07 MPa; and
cleaning zinc adhered on the surface of the work roll while keeping roughness of the surface of the work roll, by squirting the high pressure fluid from the cavitation nozzle in which the pressure PH of the high pressure fluid is set to satisfy PH≦0.5X+20.

5. The method of cleaning the rolling roll according to claim 4 , further comprising:
moving the cavitation nozzle along the surface of the work roll while keeping the distance X for cleaning.

6. The method of cleaning the rolling roll according to claim 4 , wherein
the cavitation nozzle comprises a first nozzle and a second nozzle,
the high pressure fluid is squirted from the first nozzle,
the low pressure fluid is squirted from the second nozzle simultaneously with the high pressure fluid.

7. The method of cleaning the rolling roll according to claim 4 , wherein
the cavitation nozzle comprises a first nozzle and a second nozzle, the second nozzle surrounding the first nozzle,
the high pressure fluid is squirted from the first nozzle,
the low pressure fluid is squirted from the second nozzle simultaneously with the high pressure fluid.

Assignees

• OGAWA Muneshige
• Wakabayashi Hisamoto
• Katsube Makoto
• Nishikawa Hiroshi
• Nippon Steel & Sumikin Eng Co
• Ns Plant Designing Corp

Inventors

• OGAWA Muneshige
• Wakabayashi Hisamoto
• Katsube Makoto
• Nishikawa Hiroshi

Classifications

• B05B7/061

  with several liquid outlets discharging one or several liquids · CPC title

• B08B3/024

  Cleaning by means of spray elements moving over the surface to be cleaned · CPC title

• B05B13/041

  with spray heads reciprocating along a straight line · CPC title

• B21B28/04 Primary

  while in use, e.g. polishing {or grinding while the rolls are in their stands} · CPC title

• B05B12/12

  responsive to conditions of ambient medium or target, e.g. humidity, temperature {position or movement of the target relative to the spray apparatus (B05B12/082, B05B12/084 take precedence)} · CPC title