# US 9,433,986 B2 · Rolling mill roll-cleaning device and cleaning method

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- Number: US 9,433,986 B2
- Document ID: US9433986B2
- Status: Granted
- Kind: B2
- Application number: 13/982,006
- Filed: 2012-05-15
- Published: 2013-11-21
- Granted: 2016-09-06
- Earliest claimed: 2011-05-16
- Assignees: Nippon Steel & Sumikin Engineering Co., Ltd.; Ns Plant Designing Corporation
- Applicants: Muneshige Ogawa; Hisamoto Wakabayashi; Makoto Katsube; Hiroshi Nishikawa
- Inventors: Muneshige Ogawa; Hisamoto Wakabayashi; Makoto Katsube; Hiroshi Nishikawa
- Web page: https://patentgrep.com/patent/US9433986B2

## CPC

- B21B 45/0275: {Cleaning devices}
- B05B 7/0408: {with arrangements for mixing two or more liquids}
- B05B 12/12: 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)}
- B05B 13/041: {with spray heads reciprocating along a straight line}
- B05B 15/70: Arrangements for moving spray heads automatically to or from the working position
- B08B 3/024: {Cleaning by means of spray elements moving over the surface to be cleaned}
- B21B 28/04: while in use, e.g. polishing {or grinding while the rolls are in their stands}
- B05B 7/061: {with several liquid outlets discharging one or several liquids}
- B08B 2203/0288: Ultra or megasonic jets
- B21B: ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B21, see B21C; bending by rolling B21D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B21H; pressure welding by means of a rolling mill B23K20/04)
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 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.

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 4)

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.

### Claim 7 (depends on 4)

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.