Cleaning and liquid contact with solids – Apparatus – With movably or flexibly mounted spray or jet applying...
Patent
1996-03-11
1999-03-23
Marschel, Ardin H.
Cleaning and liquid contact with solids
Apparatus
With movably or flexibly mounted spray or jet applying...
134166R, 134167R, 72 39, B08B 300, B21B 4504
Patent
active
058846433
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to cleaning method and cleaning apparatus for a surface of a sheet steel in which a surface of a sheet steel is cleaned, and more particularly to cleaning method and cleaning apparatus which may be preferably used, for example, when scale is removed from a surface of a sheet steel before a hot rolling process.
BACKGROUND ART
In manufacture of a hot-rolled sheet steel, usually, a slab is charged into a heating furnace in an oxidizing atmosphere to be heated with a temperature within a range of 1100.degree.-1400.degree. C. extending over several hours. The heated slab is hot-rolled repeatedly by a rolling machine extending over a plurality of number of times so that a predetermined thickness thereof is obtained. A high temperature heating extending over several hours causes scale to be created on a surface of the slab. If the scale is subjected to a hot rolling process in such a state that the scale does not sufficiently break away, the scale will encroach on the surface of the slab and as a result remains as a scale defect. The scale defect on the surface of the slab remarkably damages a surface nature. In addition, the scale defect will become a starting point of cracks in a bending processing or the like. These will be a cause of serious damage to quality of products. In view of this matter, hitherto, there are proposed several ways to prevent an occurrence of scale defects on a slab surface (a sheet steel surface). As one of the ways, there is known a scheme in which a water jet descaling apparatus (hereinafter, referred to as a descaler) for ejecting water at a pressure, for example, about 100-150 kg/cm.sup.2 is disposed in a direction (a width direction of a sheet steel) which intersects substantially perpendicularly to a carrying direction of the sheet steel, and high pressure water is ejected from the descaler toward a surface of the sheet steel to separate and remove scale created on the surface of the sheet steel.
In general, according to the scheme as mentioned above, there are provided a plurality of arrays of the descaler each being equipped with a plurality of nozzles in a longitudinal direction thereof (a width direction of a sheet steel) to eject water toward the surface of the sheet steel. In order to prevent scale removed by water ejected from the respective nozzles from entering a rolling machine which is installed at the downward-stream end with respect to the carrying direction of the sheet steel, water is ejected from the descaler of each of the arrays toward the upward-stream end with respect to the carrying direction of the sheet steel. By the way, water ejected from the descaler disposed at the downward-stream end with respect to the carrying direction toward the upward-stream end with respect to the carrying direction flows on the surface of the sheet steel up to a collision area in which water ejected from the descaler disposed at the more upward-stream end with respect to the carrying direction than the noticed descaler collides with surface of the sheet steel. Hence, water ejected from the descaler disposed at the more upward-stream end with respect to the carrying direction than the noticed descaler does not collide directly with surface of the sheet steel, but collides once with water ejected from the descaler disposed at the more downward-stream end with respect to the carrying direction and flowing on the surface of the sheet steel. As a result, water ejected from the descaler disposed at the more downward-stream end with respect to the carrying direction serves as a cushion, so that an impact force of water ejected from the descaler disposed at the more upward-stream end with respect to the carrying direction to the surface of the sheet steel will be reduced. Thus, this will be a cause of such a problem that it is difficult to implement a sufficient descaling.
Further, as another method of the scale eliminating ways, there is proposed a method (refer to Japanese Patent Laid Open Gazette No. 502113/1984) in which as shown in F
REFERENCES:
patent: 4344308 (1982-08-01), Shimada et al.
"Impact Pressure of Water in Hydraulic Descaling during Hot Strip Mill Rolling", Iron & Steel, vol. 9, No. 77 (1991), Tadayoshi Wada et al., pp. 1450-1457 with partial English-language translation.
The Water Jet Technology Society of Japan (1993), "Water Jet Technical Dictionary", Issued by Maruzen Co., Ltd., 7 pages with partial English-language translation.
Adachi Akio
Aoyama Naotoshi
Kanamoto Norio
Kuwako Hiroshi
Ogawa Hiroyuki
Kawasaki Steel Corporation
Marschel Ardin H.
Riley Jezia
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