JPH01111890A - Steel sheet pickling device utilizing ultrasonic wave - Google Patents

Abstract

PURPOSE:To act ultrasonic oscillation concentrically to the edge parts of a steel sheet and to extremely shorten the time for pickling by providing reflection plates for ultrasonic waves so as to enclose the edge parts of the steel sheet to form plural blocks and providing ultrasonic oscillators to each of the blocks. CONSTITUTION:Plural pieces of the blocks 6 are formed along both side parts of the steel sheet 1 so as to enclose the edge parts 1' of the steel sheet 1 by the inside walls of a pickling tank 2 as well as plural pieces of the horizontal reflection plates 4a and the vertical reflection plates 4b. The ultrasonic oscillators 3 are installed by one piece each to the side faces or front and rear faces of the tank 2 in the position corresponding to nearly the central part between the horizontal reflection plates 4a of each block 6. The ultrasonic oscillation from the oscillators 3 in each of the blocks 6 is reflected by the inside walls of the tank 2 and the horizontal and vertical reflection plates 4a, 4b so that the dispersion thereof to the outside of the blocks 6 is suppressed. The ultrasonic waves are, therefore, concentrated to the edge parts 1', by which the scale in the edge parts 1' is effectively striped and removed. The time for pickling is thus extremely shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a steel plate pickling apparatus that uses ultrasonic waves and has a short pickling time.

[Conventional technology]

As shown in Fig. 4, a conventional hot-rolled steel plate pickling device has a plurality of pickling tanks 2 containing acids such as hydrochloric acid, and the steel plate 1 is run through the acid in the pickling tanks 2. It was. Furthermore, a device using ultrasonic waves is also known, and this device has a plurality of ultrasonic vibrators 3 installed at the bottom of a pickling tank 2, as shown in FIG.

[Problem that the invention seeks to solve]

Depending on the rolling conditions, cooling conditions, etc., the scale generated on the steel plate after hot rolling is larger at the edges of the steel plate than at the center.
Therefore, in conventional pickling tanks, the removal time differs greatly between the edges and the center, and it takes a long time to remove scale from the edges, requiring large equipment with long lines. There was a problem that.

In addition, in conventional pickling equipment that uses ultrasonic waves, the inside of the pickling tank is partitioned and continuous, so the ultrasonic waves are dispersed and the scale removal effect is not noticeable. There was a problem in that it took a long time to remove scale from the parts.

The present invention was made in view of the current situation, and an object of the present invention is to provide a steel plate pickling device using ultrasonic waves that can shorten the pickling time.

[Means for solving problems]

The present invention relates to a pickling device for a steel plate that pickles the steel plate by running the steel plate in an acid in a pickling tank. a plurality of horizontal reflectors having one end extending to the inner wall of the pickling tank and the other end extending inward from the edge of the steel plate and having a notch that engages with the steel plate; and the horizontal reflector. A plurality of longitudinal reflectors are provided between the inner wall of the pickling tank and the plurality of vertical reflectors, which are installed upright above and below the inside of the edge portion of the steel plate in close proximity to the steel plate and parallel to the running direction of the steel plate. a plurality of sections formed along both sides of the steel plate so as to surround an edge portion of the steel plate by a horizontal reflector and the plurality of vertical reflectors; and a running of the steel plate in each of the sections. The present invention proposes an ultrasonic steel sheet pickling apparatus characterized by comprising a plurality of sonic vibrators installed on the upper and lower surfaces or side surfaces of the pickling tank at a central position in the y direction.

[Effect]

Ultrasonic vibrations are emitted from ultrasonic transducers installed in each compartment, and the ultrasonic vibrations are reflected by the inner walls of the pickling tank, horizontal reflectors, and vertical reflectors to suppress dispersion outside the compartment. At the same time, it concentrates on the edges of the steel plate and effectively peels off and removes scale from the edges of the steel plate. In this way, the pickling time of the steel sheet is significantly reduced.

〔Example〕

One embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is an explanatory view of one embodiment of the present invention, and is an example in which an ultrasonic vibrator is installed on the side of a pickling tank 2.

In addition, in FIG. 1, the parts with the same symbols as in FIG.
It shows parts that have the same function as the parts shown in the figure.

FIG. 1(a) is a plan view of an apparatus according to an embodiment of the present invention, (t
)l is a view taken along line A-A of Figure 1 (aJ), (Cl is a view taken along line B-B of Figure 1 (al), (d) is a view taken along line A-A of Figure 1 (aJ). It is an arrow view along the C line.

In FIG. 1, 4-a indicates the inside of the pickling tank 2,
The steel plate 10 is erected so as to be partitioned orthogonal to the traveling direction, and one horizontal end thereof extends to the inner wall of the pickling tank 2, and the other end extends inward from the edge portion 1' of the steel plate 1, A plurality of horizontal reflectors 4-b each have a U-shaped notch 5 that engages with the steel plate 1, and a plurality of horizontal reflectors 4-b are located close to the steel plate 1 above and below the inside of the edge portion 1' of the steel plate 1 between the lateral reflectors 4-a. A vertical reflector 6 stands upright parallel to the running direction of the steel plate 1, and 6 is an inner wall of the pickling tank 2, a plurality of horizontal reflectors 4-a, and a plurality of vertical reflectors 4.
-b to surround the edge part 1' of the steel plate 1,
A plurality of sections are formed along both sides of the steel plate 1. The ultrasonic transducer 3 has a transverse reflector 4-a in each section 6.
1 each on the side of pickling tank 2 at a position corresponding to the center of the
They are installed individually.

The ultrasonic vibrations emitted from the ultrasonic transducers 3 installed in each compartment 6 are reflected by the inner wall of the pickling tank 2, the horizontal reflector 4-'a, and the vertical reflector 4-b, and are transmitted to the outside of the compartment 6. The dispersion of is suppressed and concentrated on the edge part 1' of the steel plate 1, and the scale of the edge part 1' of the steel plate 1! Effectively removes peeling. In this way, the pickling time of the steel plate is significantly reduced.

Further, FIG. 2 is an explanatory diagram of another embodiment of the present invention, and is an example in which ultrasonic vibrators are installed on the upper and lower surfaces of the pickling tank 2. In FIG. 2, parts having the same reference numerals as those in FIG. 1 indicate parts having the same functions as the parts shown in FIG. Figure 2 (
al is a plan view of a device according to another embodiment of the present invention, (kl) is a view taken along line A-A in FIG. View along arrows, (+11 is in Figure 2 (a
) is a view taken along line C-C of FIG. The configuration of the device is such that the ultrasonic vibrator 3 is located at the upper and lower sides of the pickling tank 2 at a position corresponding to the approximately central part of the steel plate 1 in the running direction of the steel plate 1 in the section 6, and at a position corresponding to the cutting edge part 1' of the steel plate 1. It has a writing device. Note that the installation of each reflecting plate is the same as in the case of FIG. 1. As in the case of the above embodiment, the ultrasonic vibrations emitted from the ultrasonic vibrator 3 are reflected by the inner wall of the pickling tank 2, the horizontal reflector 4-a, and the vertical reflector 4-b, and are reflected by the edge portion 1 of the steel plate 1. ′ and remove scale.

Pickling was carried out under the following conditions using the ultrasonic steel sheet pickling apparatus of this example, and the results of measuring the scale removal time are shown in FIG.

As is clear from FIG. 3, the apparatus of this embodiment was able to remove scale in about one third of the time required by the conventional method.

(1) Pickling tank The pickling tank is 5m long and 277cm wide! , 0.5 m in height, and the vertical reflector was installed at a position 200 meters from the edge of the steel plate with a gap of 30 m from the steel plate. In addition, horizontal reflectors were installed at intervals of 500 m.

(2) Steel plate A hot-rolled cold-rolled steel plate (JIS SPCD) was used. The dimensions are a board thickness of 2.5 fins and a width of 1200 mm. Moreover, the steel plate was preheated to 80°C±5°C before pickling.

(3)! ! 7% hydrochloric acid was used as the acid, and the temperature was maintained at 80°C±5°C.

(4) Ultrasonic transducer The ultrasonic transducer uses N1-Cu ferrite, has an oscillation frequency of 40 volts, and has an output of 500 W.

Note that the conditions of the conventional method implemented as a comparative example are as follows.

■ When using ultrasound (1) Wash tank The pickling tank has a length of 5 m, a width of 2771 m, and a height of m.

(2) Steel plate A hot-rolled cold-rolled steel plate (JIS SPG D) was used. The dimensions are 2.5 mm thick and 1200 m wide. Further, the steel plate was preheated to 80°C±5°C before pickling.

(3) The acid used was 7% hydrochloric acid, and the temperature was maintained at 80℃±5℃. There is a 500W model. The installation position was at the center in the width direction at the bottom of the pickling tank, and the pitch in the longitudinal direction was 500 mm.

■　Steel plate immersion method (1) Pickling tank The pickling tank is 5 m long, 2 m wide, and 2 m high.

(2) Cold-rolled steel plate A hot-rolled steel plate (CJIS SPCD) was used. Dimensions are board thickness 2.51rR1 width 1200fl
llll! It is. Further, the steel plate was preheated to 80°C±5°C before pickling.

(3) Acid As the acid, 7% hydrochloric acid was used and the temperature was maintained at 80°C±5°C.

〔Effect of the invention〕

According to the device of the present invention, in the pickling device that utilizes ultrasonic waves, an ultrasonic reflecting plate is provided at 5 to surround the edge of the steel plate to form a section, and an ultrasonic vibrator is installed in the section. By providing this, ultrasonic vibration acts intensively on the edge portion of the steel plate, significantly shortening the pickling time.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a device in which an ultrasonic transducer according to an embodiment of the present invention is installed on the side of a pickling tank, Fig. 2 is a graph showing the relationship with this scale rate, and Fig. 4 is a diagram of a conventional acid pickling tank. Explanatory diagram of washing equipment,
FIG. 5 is an explanatory diagram of a conventional pickling device using ultrasonic waves.

Claims (1)

[Claims] In a steel plate pickling device for pickling a steel plate by running the steel plate in an acid in a pickling tank, one horizontal end of the pickling tank is erected to partition the inside of the pickling tank perpendicular to the traveling direction of the steel plate. a plurality of horizontal reflectors that extend to the inner wall of the pickling tank and have cutouts whose other ends extend inward from the edge of the steel plate and engage with the steel plate; a plurality of vertical reflectors erected above and below the inside edge of the steel plate in close proximity to the steel plate and parallel to the running direction of the steel plate;
a plurality of sections formed along both sides of the steel plate so as to surround an edge portion of the steel plate by an inner wall of the pickling tank, the plurality of horizontal reflectors, and the plurality of vertical reflectors; , a plurality of ultrasonic vibrators installed on the upper and lower surfaces or side surfaces of the pickling tank at approximately the center position in the running direction of the steel plate in each of the sections. Pickling equipment.