JPH0353088A - Device for continuously pickling band steel - Google Patents

Abstract

PURPOSE:To continuously and uniformly pickle a band steel by providing plural horns provided with a vibrator on the upper and lower parts of a pickling tank to form a sound field. CONSTITUTION:A diaphragm 8 is fixed on the upper and lower parts of a pickling tank 2 in the continuous pickling device for a band steel, and the tips of the horns 7 provided with a vibrator 6 are brought into contact with the diaphragm 8. When a high-frequency current or a high-frequency voltage is impressed on the vibrator 6, the vibration of the vibrator 6 is transmitted to the horn 7, and the band steel 1 is uniformly vibrated in its cross direction by the horn 7. Consequently, a sound wave is similarly radiated into the pickling soln. 3 from the diaphragm 8, and a uniform sound field is formed. Cavitation is caused in the pickling soln. 3 by this sound field, the collapsing pressure is transmitted to the band steel as an impulse wave, and uniform descaling is accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuous pickling device for pickling steel strip. [Prior Art] Pickling is a common method for removing scale formed on the surface of a steel strip due to hot rolling or the like. Conventional Koteiyo Renv
Figure 6 shows an outline of a typical pickling device.

(2) is a steel strip before pickling, which is usually in the state after silent rolling, with oxide scale forming on its surface.

2 is a pickling tank in which an aqueous solution (pickling precept) of acid such as II (J) 3 is stored. 4a, 4b and 5a,
5b is a deflection crawl provided at the inlet and outlet of the pickling tank 2 and inside the tank, and is used to change the running direction of the steel strip l. Reference numeral 6 denotes an ultrasonic vibrator, and a plurality of ultrasonic vibrators 6 are attached to a diaphragm 8 in a grid or staggered pattern, and the diaphragm 8 is attached above and below the pickling tank 2.

When high-frequency electricity (or high-frequency voltage) is applied to the ultrasonic vibrator 6 in this state, the ultrasonic vibrator 6 vibrates violently, and the vibration propagates into the pickling liquid 3 via the diaphragm 8. As a result, cavitation occurs in the pickling solution 3, and its collapse pressure is transmitted to the steel strip 1, promoting scale removal. At the same time, a straight flow also occurs, suppressing the formation of a boundary layer on the surface of the steel strip.

(Problems to be Solved by the Invention) The conventional continuous pickling apparatus for steel strips has the following problems to be solved.

In other words, in conventional continuous pickling equipment for band adjustment, the ultrasonic transducers are arranged discontinuously in the width direction of the steel strip, so if pickling is carried out in this state, the sound field will be affected where the transducers are. The problem was that the sound field was large and the sound field was weak in areas without a vibrator, resulting in uneven pickling.

To solve this problem, it is necessary to make the diaphragm vibrate in the same phase, but this is difficult because the diaphragm is generally thin (usually 2-3 cm) and many modes are coupled together. [Means for Solving the Problems] As a means for solving the above problems, the present invention provides a continuous pickling device for steel strips that pickles the steel strip by passing the steel strip continuously through a pickling tank. An object of the present invention is to provide a continuous pickling apparatus for steel strips, which is characterized by comprising a horn provided above and below the pickling tank, and a plurality of vibrators provided on the horn. [Function] Since the present invention is designed as described above, it has the following function. In other words, a plurality of vibrators form a sound field inside the pickling tank via the horn, so a uniform sound field can be obtained and the sound can be evenly distributed. ``You can pickle.

[Example] A first example of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, 2 is a pickling tank, and a pickling bowl 3 is stored in the pickling tank 2. Usually, an aqueous solution of about 10 to 15% hydrochloric acid is used as the pickling solution, and the temperature of the solution is maintained at about 80°C.

Deflector rolls 4a and 4b are provided on the inlet and outlet sides outside the pickling tank 2, respectively, and deflector rolls 5a and 5b are also provided inside the pickling tank 2, and the steel strip l is connected to these deflector rolls 4a, 4b. It passes through the pickling liquid 3 in the pickling tank 2 via 4b, 5a, 5b. In addition,
The deflection crawlers 5a, 5b also serve the function of maintaining the steel strip 1 at a constant level in the pickling solution 3.

A diaphragm 8 is attached to the top and bottom of the pickling tank 2, and the structure is such that the tip of a horn 7 to which a plurality of vibrators 6 are attached comes into contact with the diaphragm 8. Although the figure shows a structure in which the diaphragms 8 are arranged vertically symmetrically, there is no problem even if they are arranged alternately.

The structures of the vibrator 6, the hoist 77, and the vibrating tube are shown in a perspective view in Figure 2. 6 in the figure is a vibrator, and the vibrator 6 has the same cross section in the tentative width direction (horizontal direction with respect to the traveling direction) of the steel strip 1, and has a hole 77 with a length corresponding to the strip width. Multiple pieces (three pieces in the figure) are attached to the.

Furthermore, a diaphragm having a length corresponding to the width of the horn 7 is attached to the tip of the horn 7. Further, a fixing flange is formed on the horn 7 at a vibration node point of the horn 7 (a place where there is no amplitude).

As mentioned above, the diaphragm 8 is subjected to high temperature pickling e.g. Since it is used in the 3rd grade, it is subject to severe wear. Therefore, it is desirable to have a structure in which the diaphragm 8 and the horn 7 are removable so that only the diaphragm 8 needs to be replaced. It is also possible to remove both at the same time.

As described above, according to the first embodiment, the high frequency electric power 1 is applied to the vibrator 6.
(or a high frequency voltage), the vibration of the vibrator 6 propagates to the horn 7, and the horn 7 vibrates uniformly in the width direction of the steel strip 1.
Similarly, uniform sound waves are emitted inside, creating a uniform sound field.

This sound field causes cavitation to occur in the pickling solution 3, and its collapse pressure propagates to the steel strip 1 as a shock wave, promoting uniform removal of scale.

At the same time, a straight flow is also generated, which has the effect of suppressing the shape of the boundary layer on the surface of the steel strip and promoting the supply of new acid.

Since the above-mentioned action works in the same way in the width direction of the steel strip, scale can be removed evenly. Next, a second embodiment of the present invention will be described with reference to FIG. Note that components similar to those in FIG. 1 of the first embodiment are designated by the same reference numerals, and explanations thereof will be omitted.

In FIG. 3, diaphragms 8 are placed above and below the pickling tank 2.
a is attached, and a vibrator 6 and a conical horn 7a for vibration diffusion are fixed via the vibrator 8a. In the above structure, when a high frequency current (or high frequency voltage) is applied to the vibrator 6, the vibration of the vibrator 6 is transmitted to the diaphragm 8.
a, it propagates to the conical horn 7a, from there it becomes a sound wave and is diffused and transmitted into the pickling residue 3, giving a uniform sound field to the steel strip 1 during pickling. This sound field allows you to pickle! Cavitation occurs in the steel strip 3, and its collapse pressure propagates to the steel strip 1 as a shock wave, promoting scale removal.

At the same time, a straight flow is also generated, suppressing the shape of the boundary layer on the surface of the strip 1, and also having the effect of promoting the supply of new acid to the steel strip 1.

Since the above-mentioned action acts uniformly over the entire surface of the steel strip 1,
Scale can be removed evenly.

Next, a third embodiment of the present invention will be described with reference to FIGS. 4 and 5. Note that components similar to those in FIG. 1 of the first embodiment are designated by the same reference numerals, and descriptions thereof will be omitted.

In Fig. 4, integrated horns 7b corresponding to the plate convergence of the steel strip l are attached to the top and bottom of the pickling tank 2, and each of the horns 7b has a plurality of vibrators (three each in the figure). 6 is placed. In addition, in the figure, the hole 77b is vertically symmetrical.
Although the structure is shown in which two are installed, there is no problem in placing them alternately. The structure of the vibrator 6 and the hole 77b is shown in FIG. In the figure, 6 is a vibrator, and a plurality of vibrators 6 are attached to a horn 7b having the same cross section in the width direction of the steel strip 1 and having a length corresponding to the width of the steel strip. .

Further, the flange that is integrally formed with the horn 7b is provided at a node point (a point with no amplitude) in the horn 7b, and is designed to have no influence on the vibrations of the horn 7b.

In the above structure, when a high frequency current (or high frequency voltage) is applied to the vibrator 6, the vibration of the vibrator 6 is caused by the horn 7.
b, the horn 7b makes the same vibration in the temporary width direction of the steel strip 1. That is, due to the vibration, the same sound field is formed in the pickling liquid 3 in the temporary width direction of the steel strip 1.

This sound field causes cavitation to occur in the pickling solution 3, and its collapse pressure propagates to the steel strip 1 as a shock wave, promoting uniform removal of scale.

In other respects, the same functions as in the first and second embodiments are achieved.

As described above, according to the first to third embodiments, a uniform sound field is formed in the width direction (left and right direction with respect to the moving direction) of the toning belt to be pickled, and the sound field The collapse pressure of the generated cavitation promotes uniform scale removal, which has the advantage of achieving even pickling.

〔Effect of the invention〕

Since the present invention is implemented as described above, it has the following effects.

That is, since the vibrator creates a sound field in the sour tank through the horn, a uniform sound field is created in the temporary width direction of the steel 11F, thereby making it possible to remove scale evenly. .

[Brief explanation of drawings]

1 is a schematic diagram of a first embodiment of the present invention, (A) is a side sectional view, (B) is a plan view, and FIG. 2 is a perspective view of the vibrator 6, horn 7, and diaphragm 8 of FIG. 1. 3 is a diagram showing the second embodiment of the present invention corresponding to FIG. 1, FIG. 4 is a diagram also showing the third embodiment, and FIG. 5 is the vibrator of FIG. 4. 6. Horn 7
(^) is a view corresponding to Fig. 4 (A), (B) is a side view of (A), (C) is a top view of (^), and Fig. 6 is a conventional view. In the figures of the example, (A) is a side sectional view, and (B) is a plan view. 1- Steel strip, 2- Pickling tank, 3 Pickling liquid, 6- Vibrator,

Claims (1)

[Claims] In a continuous steel strip pickling device that pickles the steel strip by passing the steel strip continuously through a pickling tank, there are horns provided above and below the pickling tank, and horns provided on the same horn. A continuous pickling device for steel strip, characterized by comprising a plurality of vibrators.