JP3040602B2 - Pickling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickling facility for cleaning an oxidized layer on the surface of a hot-rolled steel sheet with an acid solution.

[0002]

2. Description of the Related Art An example of a conventional pickling apparatus for pickling and cleaning an oxide layer on the surface of a hot-rolled steel sheet is shown in FIG. 4 or FIG.

In these figures, a pickling solution is filled in a container sealed by a box wall 11 on the upper and lower surfaces.
A lower surface weir 13 that supports a hot-rolled steel plate 14 from below is fixed to the lower box wall 11.

[0004] The steel sheet 14 passes through the container while being supported by the lower surface weir 13, and during this time, the oxidized layer on the surface of the steel sheet 14 is dissolved by an acid solution by a chemical reaction and is washed and removed.

The upper weir 12 is a weir provided on the box wall 11 on the upper surface to suppress the flow of the acid solution accompanying the surface of the steel plate 14 and moving together with the steel plate 14.

[0006] As the upper surface weir 12 is brought closer to the steel sheet 14 and the accompanying acid solution on the steel sheet surface is stripped off, the stirring of the acid solution on the steel sheet surface progresses, and the pickling effect becomes larger.

All of the above-mentioned conventional devices have a structure in which the upper surface weir 12 is installed right above the lower surface weir 13, and the gap between them is fixed.

[0008]

However, in order to increase the effect of pickling and to shorten the pickling time, the above-mentioned structure of the conventional pickling equipment employs an acid solution which adheres to the steel sheet and flows on the surface of the steel sheet. In addition, a means is used in which the lower surface is cleaved thinly to increase the agitation of the liquid on the surface of the steel sheet.

Accordingly, in order to enhance the effect of accelerating pickling, it is necessary to make the upper surface weir as close as possible to the steel plate.

However, in order to bring the crest on the upper surface close to the steel plate in the structure shown in the drawing, if the tip of the cough is extended downward,
The gap between the lower surface crevice becomes narrower, and there is a problem in passing property such as contact with a steel plate, and there is a limit to the width of the gap that can be approached.
There has been a problem that a sufficient pickling effect cannot be exhibited.

An object of the present invention is to provide a new pickling facility which solves the above problems.

[0012]

In order to achieve the above object, the pickling equipment of the present invention comprises a hot rolled steel sheet filled with an acid solution, a lower surface crest for supporting the steel sheet on a lower surface, and a liquid flow on the upper surface. In pickling equipment that removes the oxidized layer on the surface by passing it through a sealed container having an upper surface weir, the upper surface weir is tilted in the running direction of the steel plate to make the value of the gap between the upper surface weir and the lower surface weir variable It is configured so that it can be performed.

[0013]

With the above construction, in the pickling equipment of the present invention, the narrow gap between the upper and lower crests, which has been a problem in the conventional structure, can be tilted in the traveling direction of the steel plate. This solves the problem by making the gap of the gap variable, widening the gap for a distorted steel sheet that cannot be passed through a narrow gap with a bad shape, and narrowing it for a narrow and problem-free steel sheet The processing can be performed with the gap.

Therefore, the boundary layer of the acid solution that moves with the steel plate on the surface of the steel plate can be stripped off at the upper surface to make the steel plate sufficiently thin according to the shape of the steel plate.

Since the boundary layer of the acid solution on the surface of the steel sheet becomes a resistance when supplying a fresh acid solution to the oxide layer of the steel sheet, it is necessary to make the boundary layer as thin as possible in order to effectively perform pickling. Become.

Therefore, the pickling equipment of the present invention is expected to improve the pickling acceleration effect by making it possible to sufficiently reduce the boundary layer of the acid solution on the steel sheet surface without causing the problem of passing the steel sheet. it can.

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 3 are a structural view and a sectional view of a main part of the pickling equipment according to the present invention.

In FIG. 1, a pickling solution is filled in a container sealed by upper and lower box walls 1, and a lower surface weir 3 for supporting a steel plate 4 hot-rolled on the lower box wall 1 from below is fixed. Have been.

The steel plate 4 is passed through the container while being supported by the lower surface weir 3, and during this time, an oxidized layer on the surface of the steel plate 4 is dissolved by an acid solution by a chemical reaction and washed and removed.

The box wall 1 on the upper surface is used to stop the flow of the acid solution accompanying the surface of the steel plate 4 and moving together with the steel plate 4.
The upper ditch 2 provided on the upper surface is formed so as to be capable of tilting and moving in the traveling direction of the steel plate, whereby the gap d between the upper ditch 2 and the lower ditch 3 is changed by driving the upper ditch 2. Is possible.

For this reason, a steel sheet 4 whose shape is distorted and cannot be passed through a conventional narrow gap can be processed without problems by widening the gap.

The tip of the upper surface weir 2 can be brought close enough to the steel sheet surface in accordance with the shape of the steel sheet, and the boundary layer of the acid solution on the steel sheet surface can be stripped sufficiently thin.

Therefore, in the pickling equipment of the present structure, even a steel plate having a poor shape can be passed without any problem, and the pickling acceleration effect for shortening the pickling time can be further increased as compared with the conventional structure.

FIG. 2 shows a specific configuration of an upper surface weir which can freely change the height of the weir without impairing the sealing performance of the acid solution.
By providing the base of the weir 2 on the box wall side in a columnar shape, and by forming the box wall side in a cylindrical shape corresponding to this, the gap 21 generated between the upper weir 2 and the box wall can always be minimized, The leak of the acid solution in the box can be minimized.

Even if the acid solution leaks, FIG.
By adopting the structure as shown in (1), it is possible to take measures against acid solution leakage. That is, FIG. 3 shows a cross section taken along the line II of FIG. 2. In order to prevent the acid solution flow 22 leaking from the gap 21 between the box wall 1 and the upper surface weir 2 from scattering on both side walls of the acid tank. Preferably, a protector 23 is provided so as to cover the acid solution flow 22 and a side groove 24 is provided, and the leak groove 25 is returned to a circulation tank (not shown) by the side groove 24.

Although one embodiment has been described above, the present invention is not limited to the structure of one embodiment, and various design changes can be made within the technical idea of the present invention.

[0028]

As described above, according to the pickling equipment of the present invention, even a steel sheet having a poor shape can be treated without any trouble, and the effect of shortening the pickling time is remarkably increased.

Therefore, the economic effect of the improvement of the processing capacity of the pickling equipment according to the present invention is very large.

[Brief description of the drawings]

FIG. 1 is a structural view of a pickling facility according to one embodiment of the present invention.

FIG. 2 is an enlarged side view of the upper movable crest in FIG.

FIG. 3 is a sectional front view taken along line II of FIG. 2;

FIG. 4 is a structural view of one example of a conventional pickling facility.

FIG. 5 is a structural view of another example of the conventional pickling equipment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box wall 2 Upper surface weir 3 Lower surface weir 4 Steel plate 20 Shaft 21 Crevice 22 Acid liquid flow 23 Protector 24 Side groove 25 Leaked acid liquid

Continued on the front page (72) Inventor Shoji Nagai 4-6-22 Kanon Shinmachi, Nishi-ku, Hiroshima Sanritsu Heavy Industries, Ltd. Hiroshima Works (72) Inventor Satoshi Sakamoto 4-2-2 Kanon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Hiroshima Heavy Industries, Ltd. (72) Inventor Shigeo Itano 4-622 Kannon Shinmachi, Nishi-ku, Hiroshima City Sanishi Heavy Industries Co., Ltd.Hiroshima Research Center (72) Yuji Furusawa 4-622 Kannon Shinmachi, Nishi-ku, Hiroshima City (72) Inventor Masaki Aihara 1 Kawasaki-cho, Chuo-ku, Chiba Kawasaki Steel Co., Ltd.Chiba Works, Ltd. (72) Inventor Eno Mano 1 Kawasaki-cho, Chuo-ku, Chiba City Kawasaki Steel Corporation Chiba Works (56) References JP-A-3-267388 (JP, A) (58) Fields investigated Int.Cl. ⁷ , DB name) C23G 3/02

Claims (1)

(57) [Claims] 1. An oxide layer on the surface is removed by passing a hot-rolled steel sheet through a sealed container having a lower surface crest filled with an acid solution and supporting the steel plate on the lower surface and an upper surface crest on the upper surface for restricting the liquid flow. The pickling equipment is characterized in that the upper crest can be tilted in the running direction of the steel sheet in order to make the gap between the upper crest and the lower crest variable.