JPS62116791A - Continuous pickling device - Google Patents

Abstract

PURPOSE:To prevent the floating and exposing of a band steel and to prevent the deterioration in pickling performance by providing plural pairs of skids or roller so as to sandwich the band steel to each of pickling tanks segmented by partitions. CONSTITUTION:At least >=1 pairs of the skids or rolls 12 are provided so as to sandwich the band steel 5 for each of the divided pickling tanks to pass the band steel by dipping the same into acid solns. 4 in the pickling tanks of a continuous type pickling device which pickles the band steel 5 by moving same in the pickling tanks segmented to the plural tanks by the partitions. The floating of the band steel 5 from the solns. 4 is thereby prevented and the level difference between the inlet side and outlet side of the solns. 4 is decreased, by which the exposing length of the band steel 5 is shortened and the decrease in the pickling efficiency of the band steel 5 is prevented. The overflow of the solns. 4 beyond the partition is obviated and the difference in the acid concn. between the tanks is adequately maintained.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a continuous pickling device that is applied to process equipment of iron-making machinery. [Prior Art] [Prior Art] Figure 4 shows a typical pickling tank.

In Fig. 4, 1 is the pickling tank main body, 2 is the partition, 3 is the force/(-14 is the acid solution, 5 is the steel strip, 6 is the inlet side support roll,
7 adheres to the surface of the steel strip 5 and is oxidized i1! The aperture 90 for removing L4, 8 is a washing tank for washing the steel strip 5 after pickling.

In addition, Fig. 5 is an enlarged view of the pickling tank shown in Fig. 4, and in this figure, 9 is a welded steel plate structure, 10 is an acid-resistant porcelain brick, and 11 is installed on the top of the partition 2. This is a skid for supporting strip steel.

As shown by the arrows in each figure, the steel strip 5 enters the straw 1 tank of the pickling tank from the inlet side support roll 6, and progresses in a catenary curve through the acid solution 4 stored in the tank. Then, cross the partition 2,
Enter into the second divided tank. In this divided tank, the acid liquid 4 progresses in a catenary curve in the same manner as in the first tank, passes through the third divided tank and the fourth divided tank, and thus the strip steel While the material 5 passes through the acid solution 4, the oxide film on its surface is sequentially removed, and then passes through water in a washing tank 8, where it is washed with water and sent to the first step.

[Problem that the invention seeks to solve]

Recently, pickling lines have been made faster in order to be continuous with rolling lines and to improve productivity. As pickling lines become faster, the following problems have arisen.

(a) As shown in Fig. 6, the steel strip 5 is not raised;
It is not immersed in the acid solution 4, which reduces the pickling performance.

(1)) As shown in Figure 7, the liquid level difference Δh=
(hx: liquid level at the tank outlet, al: liquid level at the tank inlet) Since the perun becomes large, the exposed length L of the steel strip 5 at the inlet of the cypress becomes long, which deteriorates the pickling performance.

(C) As shown in Figure 7, when the liquid level difference Δh is large and the acid liquid 4 exceeds the partition 2 (part A), the difference in hydrochloric acid linearity in the calibration disappears, and one tank is relatively Eye waste@concentration increases and operating costs increase.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to address the drawbacks of such conventional devices.
The purpose of the present invention is to provide a nine-continuous vending machine.

[Means for solving problems]

The present invention is divided into a plurality of tanks by partitions.
[Regarding a continuous pickling device characterized in that each divided tank of the washing tank is provided with at least one pair of skids or rolls so as to sandwich the steel strip therebetween.]

[Effect]

The present invention will be explained below based on the drawings.

In the present invention, as shown in Figure m1 and FIG. ft) or one or more pairs of rolls 12 are arranged in parallel. This makes it possible to prevent the steel strip 5 from floating 9 and to reduce the liquid level difference Δh. The reason for this is shown in equation (1) below.

Δh level difference δ: boundary layer thickness X: length level difference Δh from the entrance immersion part of the steel strip
is proportional to. Therefore, the conventional type shown in Fig. 3 (Fig. 3 (a)
)) and the tank of the present invention (Figure 3)], as shown in the figure, in the case of the present invention, the boundary layer is cut by the steady or roll 12,
The integral value of the boundary layer thickness (eLx) becomes smaller, and the level difference Δh becomes smaller.

In Fig. 3, δ: Boundary layer thickness at the position of length X from the entrance of the strip immersion section δθ: Boundary layer thickness at the position of the strip steel immersion length t"X:
A certain distance L from the inlet immersion part of the steel strip: immersion length of the steel strip,
In other words, it is the entire length.

Bone Boundary layer thickness is the distance from the surface of the steel strip to the area where water flows following the movement of the steel strip.

δ/δsij on the vertical axis indicates the dimensionless value of the boundary layer, and X/p on the horizontal axis indicates the dimensionless value of the distance from the entrance immersion part of the steel strip 5.

〔Effect of the invention〕

(a) Since the steel strip 5 is immersed in the acid solution 4, deterioration in pickling performance can be prevented.

(b) Since the liquid level difference Δh is small, the exposed length t of the steel strip 5 is not short, and a drop in pickling performance can be prevented.

(0) Since the acid solution 4 does not exceed the partition 2, the concentration of hydrochloric acid in the inlet tank is low, the waste tR concentration is low, and the operating cost is therefore low.

[Brief explanation of drawings]

Figures m1 and 2 show aspects of the continuous pickling apparatus according to the present invention. Figure 3 shows a comparison between the conventional device and the device of the present invention in terms of boundary layer thickness at a distance from the inlet immersion section of the steel strip. Fig. 4 shows a conventional continuous pickling device, and Fig. 5 is an enlarged view of the pickling tank shown in Fig. 4. FIG. 6 shows a phenomenon in which a steel strip floats up in a conventional pickling tank, and FIG. 7 shows a phenomenon in which a difference in liquid level increases in a conventional pickling tank. Sub-Agents 1) Meifuku Agent Ryo Hagiwara − Sub-Agent Atsuo Anzai

Claims (1)

[Claims] A continuous pickling device characterized in that each divided tank of a pickling tank divided into a plurality of tanks by partitions is provided with at least one pair of skids or rolls so as to sandwich the steel strip.