JPH04116186A - Apparatus for pickling band steel - Google Patents

Abstract

PURPOSE:To regulate the immersion time of band steel while maintaining a specific rate of transfer of the steel by setting a movable roll between first and second rolls arranged near both ends of a pickling vessel so that the position of the movable roll can be regulated. CONSTITUTION:Band steel A is introduced into a pickling vessel 1, wound around a second roll 3 through a first roll 2, further wound around a movable roll 4 and sent to a subsequent process. Since the roll 4 is movable, the interval L between the rolls 3, 4 is regulated by moving the roll 4 when the concn. or temp. of an acid or the kind of steel is changed and the immersion time can be regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pickling apparatus suitable for use in producing steel strips.

[Conventional technology]

When producing steel strips, a pickling process is provided after heat treatment and hot rolling to remove formed scale. Figure 2 shows an example of the treatment process in which pickling is performed. - The steel strip A treated in step 21 is transported to the first pickling tank 22, where it is subjected to a first pickling treatment. Next, after passing through a brush cleaning step 23, it is transported to a second pickling tank 24, where it is subjected to a second pickling process. The steel strip is then subjected to a washing process 25 in which an acid solution is applied in parallel, and then dried in a drying process 26. In an inspection process 27, the steel strip is inspected using the =J method, appearance, and ultrasonic waves for the presence or absence of flaws. is wound up.

Conventionally, the pickling equipment used in the above-mentioned pickling treatment has a structure in which a first roll 2 and a second roll 3 are arranged near both ends of a pickling tank 1, as shown in FIG. Met. In this pickling device, the band j14A is conveyed in the direction of the arrow by the conveyor roll 5, introduced into the pickling tank 1 filled with acid solution B, and transferred between the first roll 2 and the 20th-rule 3. After the immersion treatment is performed, the material is transported to the next processing step by transport rolls 6.

[Invention or problem to be solved]

However, when using the above-mentioned conventional pickling equipment, pickling may occur unevenly on the top and bottom surfaces of the steel strip, the temperature and concentration of the acid solution may be uneven, and smut may remain on the top surface of the steel strip. There was a problem. Conventionally, when the pickling conditions change, the immersion time in the acid solution in the pickling tank has been adjusted by controlling the transport speed of the steel strip. However, controlling the conveyance speed of the steel strip for pickling causes problems in line operation in which a series of continuous operations are performed, and significantly reduces work efficiency. Therefore, conventionally, in line operations, it has been desired to carry out pickling treatment such that a steel strip having a good pickling surface can be obtained while maintaining the conveying speed of the steel strip constant without changing it.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a pickling tank in which the immersion time of the steel strip can be adjusted.

[Means to solve the problem]

The acid and L device of the present invention includes an acid washing tank, first and second rolls disposed near both ends of the pickling tank, and a position between the first roll and the second roll. It consists of movable rolls arranged in an adjustable manner, and the steel strip is conveyed by being stretched between the first roll and the second roll, and further by being conveyed by being stretched from the second roll to the movable roll. do.

[Effect]

The case of pickling a steel strip using the acid pickling device of the present invention will be explained with reference to FIG. 1 corresponding to the embodiment. from the roll 2 to the second roll 3, and then from the second roll to the movable roll 4, and is transported from the pickling tank to the next step. At this time, since the movable roll 4 is movably mounted, if the concentration of acid, temperature changes, or the type of steel is changed, the movable roll 4 can be moved.
By adjusting the distance between the movable roll 4 and the movable roll 4, it is possible to adjust +81 during immersion.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1(a) is a longitudinal cross-sectional view of the pickling device of the present invention, FIG.
b) is a plan view thereof.

In the figure, ■ indicates a pickling tank, which is filled with acid solution B. Inside the pickling tank, a first roll 2 and a second roll 3 are arranged at fixed positions. A pair of support members 7.7 for supporting the movable rolls are mounted on the top of the pickling tank so as to be movable on guide rails 9.9. Each support member 7 is provided with an arm 8 that reaches the inside of the pickling tank, and a movable roll 4 is rotatably attached to the lower end of the arm 8. Therefore, by moving the support member 7 on the guide rail 9, the movable roll can
It can be moved within the pickling FΩ.

In addition, 5, 5 and 6, 6 are a pair of conveyance rolls for conveying the strip steel A.

In the above-mentioned pickling apparatus of the present invention, the steel strip A sent to the pickling tank by the conveyor roll 55 is passed from the first roll 2 to the second roll 3, and is further movable from the second roll 3. The H sheet is passed around the roll 4 in a folded manner, folded back over the movable roll 4, and conveyed while being held between the conveyor rolls 6 and 6. Since the pickling tank is filled with acid solution B,
The steel strip A is kept immersed in the acid solution from the first roll 2 through the second roll 3 to the movable roll 4. Therefore, by moving the movable roll 4, it becomes possible to adjust the immersion time. That is, by shortening the distance between the movable roll and the second roll, the immersion time can be shortened, and by increasing the distance, it is possible to increase the immersion/1111η interval.

〔Effect of the invention〕

As described above, the acid pickling device of the present invention is provided with a movable roll, so that it is possible to adjust the immersion time of the steel strip to be pickled, thereby changing the conveyance speed of the steel strip. The pickling treatment can be carried out in a constant state without having to do so. The pickling device of the invention is therefore suitable for use in continuous line operations where operations are carried out at a constant conveying speed.

[Brief explanation of drawings]

FIG. 1(a) is a longitudinal cross-sectional view of the pickling device of the present invention, FIG.
b) is a plan view thereof, and FIG. 2 is a cleaning process diagram.
FIG. 3 is a longitudinal sectional view of a conventional pickling device. DESCRIPTION OF SYMBOLS 1... Pickling tank, 2... First roll, 3... Second roll, 4... Movable roll, 5, 6... Conveyance roll, 7 Support member 1.8... Arm, 9, 9. Guide rail, A
...Strip steel, B...Acid solution.

Claims (1)

[Claims] (1) A pickling tank, first and second rolls arranged near both ends of the pickling tank, and a position adjustable between the first roll and the second roll. Pickling of a steel band, which consists of a movable roll, and is characterized in that the steel band is conveyed by being stretched over a first roll and a second roll, and further conveyed by being stretched from the second roll to a movable roll. Device.