JPH0578870A - Continuous pickling device - Google Patents

Abstract

PURPOSE:To improve the pickling effect by providing plural receiving members for clamping a strip in the rectangular-sectioned passage surrounding the strip in the traveling direction of the strip. CONSTITUTION:A traveling strip 61 is dipped in a pickling soln. 62 of an immersion-type continuous pickling tank 51 in the continuous pickling device. A rectangular-sectioned passage 54 surrounding the strip 61 is provided in the tank 51. Plural receiving skids 59a, 59b,... for clamping the strip 61 and immersion guide rolls 60a, 60b,... are provided in the passage 54 in the traveling direction of the strip 61, and an ultrasonic diaphragm is opposed to the strip in the passage, and an ultrasonic vibration is furnished to the diaphragm. A jet nozzle is provided to discharge the plating soln. in the opposite direction to the traveling of the strip. Consequently, a high pickling effect is obtained at a low equipment cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous pickling apparatus for pickling traveling strips.

[0002]

2. Description of the Related Art An example of a conventional continuous pickling apparatus is shown in FIG. In FIG. 6, 1 is a strip plate, 2 is an immersion type acid tank,
3 is an acid solution, and 4a, 4b, 4c, 4d and 4e are guide rolls.

After the strip 1 at room temperature is unwound from a payoff reel (not shown), the scale formed on the surface of the strip 1 while traveling while being immersed in the acid solution 3 in the acid tank 2 is the acid solution 3. The strip plate 1 that has been pickled and removed by descaling and then descaled exits from the acid tank 2 and is supplied to a post process (not shown).

The pickling effect when the acid tank 2 is used will be described with reference to FIG. The pickling effect can be estimated by heat transfer. In FIG. 7, the flat plate 5 travels in a wide static fluid, and the boundary layer 6 spreads from the tip of the flat plate 5. The mass transfer coefficient h _a at that time is expressed by Equation 1.

[0005]

[Formula 1] h _a = 0.037 (S _C ) ^2/3・ (R ₁ ) ^0.8・ D / 1

Here, S _C is the Schmidt number of the liquid, R _L is the Reynolds number, D is the diffusion coefficient of the liquid, and 1 is the length of the flat plate 5.

The mass transfer coefficient h _a can be obtained based on the above equation 1, and the pickling effect can be estimated and evaluated by the mass transfer coefficient h _a .

By the way, in order to speed up the line, increase the amount of difficult-to-scale material and reduce the cost, there is a need for equipment for improving the pickling efficiency (descaling rate). As a means for improving pickling efficiency, a continuous pickling device known as a jet pickling device has begun to spread as a new type of equipment.

The jet pickling apparatus will be described with reference to FIGS. 8 and 9. FIG. 8 is a schematic side view of the jet pickling apparatus, and FIG.
The IX-IX line arrow in the middle is shown.

As shown in the drawing, the tank main body 11 has a box-like shape with an open upper surface, and side walls 13 are provided along both sides of the strip 12 to be conveyed in the running direction (left-right direction in FIG. 8). There is.

A part of the tank bottom surface 14 of the tank body 11 is formed so as to be one step higher in the traveling direction of the strip plate 12, and the belt plate 12 is supported on the one step higher tank bottom surface 14. A plurality of skids 15 are provided. Further, in the tank main body 11, drainage paths 16, 16 are formed on both sides of the tank bottom surface 14 which is formed higher along the running direction of the strip 12, and the front and rear of the running direction of the strip 12 are formed. In the collection chamber 1
7, 17 are formed. Drainage pipes 18 and 18 are attached to the liquid collection chambers 17 and 17, respectively.
Reference numerals 8 and 18 are connected to an acid solution tank 20 that stores a pickling solution 19.

A cover 21 for closing the tank body 11 is provided on the upper surface of the tank body 11. The cover 21 is provided on the side wall 13.
Is joined to the upper part of. The cover 21 includes a strip 12
Inner tank cover 2 having a side wall 22 in the traveling direction of the vehicle
3 is provided via a plurality of support portions 24. An opening 25 is formed near the center of the side wall 22 of the tank inner cover 23 in the longitudinal direction.
And the drainage channel 16 communicate with each other.

In the vicinity of both side surfaces of the in-tank cover 23, a first nozzle header 26 is mounted on the inlet side of the strip plate 12 in the traveling direction, and second nozzle headers 27, 28 are mounted on the outlet side thereof. Has been. Each nozzle header 26, 27, 28 is connected to the above-mentioned acid liquid tank 20 by a supply pipe 29.
The pickling solution 19 is jetted by the acid pump 30 installed in the.

In this way, the nozzle headers 26, 27,
The pickling solution 19 ejected from the nozzle 28 is ejected into the pickling tank 31 formed by being surrounded by the tank bottom surface 14 of the tank body 11, the tank inner cover 23, and the side wall 22, and the inside of the pickling tank 31 is skided. Strip 1 that runs while being supported by 15
2 comes into contact with the pickling solution 19 while traveling, and the upper and lower surfaces thereof are pickled.

At this time, each nozzle header 26, 27, 28
The pickling solution 19 ejected from is stored in the pickling tank 31, then flows from the opening 25 provided in the side wall 22 to the discharge passage 16 and then into the liquid collecting chamber 17. Then, the pickling solution 19 stored in the collecting chamber 17 is returned to the acid solution tank 20 by the drain pipe 18.

The pickling effect when the jet pickling apparatus is used will be described with reference to FIG. 10 by heat transfer as described above. In FIG. 10, the flat plate 5 travels in a narrow area, and the material coefficient h _b at that time is expressed by the equation 2.

[0017]

[ _Formula 2] h _b = 0.023 (R _ezd ) ^4/5 · (S _C ) ^0.4 · D / 2d

However, d is the distance between the flat plate 5 and the wall.

[0019] Thus, by suppressing the development of the boundary layer at the upper and lower walls, h _b> h _a, and the comparison with the pickling effect of using an acid tank 2, the pickling effect of the jet pickling device Get higher In addition, since the jet pickling equipment has a small amount of acid solution in the pickling tank, the total amount of acid solution can be small, and the time for extracting the acid solution due to equipment troubles, etc. There is also an advantage that the time is fast.

[0020]

However, in the jet pickling apparatus, in order to hold the acid solution in the pickling tank and change the supply and replacement of the acid solution, it is necessary to have a pressure resistance or a liquid sealing structure, and the equipment cost is high. Was high. Therefore, when a jet pickling apparatus is newly used, enormous cost investment is required.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a continuous pickling apparatus which can obtain a high pickling effect with a small equipment cost.

[0022]

In order to solve the above problems, the structure of the present invention encloses a strip in a continuous pickling apparatus equipped with an immersion type continuous pickling tank in which a traveling strip is immersed. A flow path having a rectangular cross section is provided in the immersion type continuous pickling tank, and a plurality of receiving members sandwiching the strip plate are provided in the flow passage along the traveling direction of the strip plate.

Further, the structure of the present invention for solving the above-mentioned problems is, in a continuous pickling apparatus equipped with an immersion type continuous pickling tank in which a traveling strip is immersed, a flow having a rectangular cross section surrounding the strip. A path is provided in the immersion type continuous pickling tank, an ultrasonic vibration plate facing the plate surface of the strip plate is provided in the flow path, and a plurality of ultrasonic vibrators are provided in the ultrasonic vibration plate, A jet nozzle, which is opposed to the running direction of the strip and discharges the pickling solution toward the strip, is provided in the immersion type continuous pickling tank.

[0024]

In the first aspect of the present invention, the strip plate is surrounded by the rectangular flow path, and the strip plate is sandwiched by the receiving member, so that the dipping type pickling tank can be moved along with the traveling of the strip plate without forming a pressure resistant structure. While the pickling solution is drawn and the pickling solution in the flow path is replaced,
The boundary layer is cut into pieces to scrape off hydrogen bubbles generated on the surface of the strip.

In the second aspect of the present invention, the rectangular plate is surrounded by the rectangular flow path, and the ultrasonic vibrating plate and the jet nozzle are provided. The pickling solution is drawn to replace the pickling solution in the flow path, and the pickling solution is discharged toward the strip plate to vibrate the pickling solution to enhance the thermal conductivity.

[0026]

1 is a schematic side view of a continuous pickling apparatus according to the first invention, and FIG. 2 is a view taken along the line II--II in FIG.

Immersion deflector rolls 52 and 53 are provided at the inlet and outlet of the acid tank 51, and a flow path 54 having a rectangular cross section is formed between the immersion deflector rolls 52 and 53. The flow path 54 includes a bottom plate 55 extending in the line direction,
It is composed of a bottom plate 55 and an upper plate 56 facing in parallel with each other. The bottom plate 55 and the upper plate 56 are suspended and supported by an acid tank lid 58 via side plates 57 (see FIG. 2).

Skids 59a to 59h as receiving members are attached to the bottom plate 55 at equal intervals in the line direction, and the dipping guide rolls 60a are opposed to the skids 59a to 59h.
~ 60h are provided. The strip 61 is guided to the pickling solution (acid solution) 62 by the dipping deflector roll 52 on the entry side, and the skids 59a to 59h and the dipping guide roll 60a.
After passing through the gap of about 60 h, it is conveyed to the outside of the acid tank 51 by the immersion deflector roll 53 on the exit side.

The skid 59 and the dipping guide roll 6
The relationship of 0 may be reversed upside down, and the skid 59 or the immersion guide roll 60 may be used together.

In the continuous pickling apparatus having the above structure, the strip plate 61 is guided to the acid solution 62 by the dipping deflector roll 52 on the inlet side, and the strip plate 61 passes through the gap between the skids 59a to 59h and the dipping guide rolls 60a to 60h. Then, it is transported to the outside of the acid tank 51 by the immersion deflector roll 53 on the exit side.

When the strip plate 61 passes through the channel 54, the acid solution 62 in the channel 54 is attracted to the strip plate 61,
The acid solution 62 inside is replaced. Therefore, the same action as that of the jet pickling apparatus can be obtained without making the acid tank 51 a pressure resistant structure.

Further, the strip 61 is a skid 59a to 59h.
Since it is sandwiched between the immersion guide rolls 60a to 60h and passes through the gap, the boundary layer is cut into pieces and hydrogen bubbles generated on the surface of the strip plate 61 are scraped off.

According to the continuous pickling apparatus described above, the acid solution 62 in the flow path 54 can be replaced without making the acid tank 51 a pressure resistant structure, and the pickling effect can be improved.
In addition, the skids 59a to 59h and the immersion guide roll 60
The boundary layer is shredded by a to 60h, hydrogen bubbles on the surface of the strip plate 61 are scraped off, and the pickling effect is promoted.

The continuous pickling apparatus of the second invention will be described with reference to FIGS. 3 to 5. FIG. 3 is a part of a schematic side view of the continuous pickling apparatus according to the second invention, FIG. 4 is its front surface, and FIG.
The enlarged state of the arrow IV part in the inside is shown. 1 and 2
The same members as those shown in are denoted by the same reference numerals, and overlapping description will be omitted.

Immersion guide roll 60 in the flow path 54
An ultrasonic vibration plate 71 is provided between the ultrasonic vibration plate 71 and
As shown in FIG. 5, the hanging jig 73 is fixed to the hanging jig 73 by the bolt 72, and the hanging jig 73 is attached to the upper plate 56. The ultrasonic vibration plate 71 is attached to the hanging jig 73 via a packing 74, and the acid liquid 62 is sealed by the packing 74. A large number of ultrasonic vibrating plates 75 are provided on the ultrasonic vibrating plate 71, and the strip plate 6 is provided below the ultrasonic vibrating plate 71.
A round bar 76 for preventing the collision of the No. 1 is attached across the side plate 57.

An acid pump 77 is provided in the acid tank 51, and the acid pump 77 communicates with a pipe 78. Piping 78
The jet nozzle 79 is attached to the tip of the jet nozzle 7.
9 is provided to face the traveling direction of the strip 61. That is, the acid liquid 62 sucked by the acid pump 77 is sent from the pipe 78 to the jet nozzle 79, and the acid liquid 62 is directed from the jet nozzle 79 to the traveling direction of the strip plate 61.
Discharge toward.

In the continuous pickling apparatus having the above construction, the strip plate 61 is guided to the acid solution 62 by the dipping deflector roll 52 on the inlet side, and the strip plate 61 passes through the gap between the skids 59a to 59h and the dipping guide rolls 60a to 60h. Then, it is transported to the outside of the acid tank 51 by the immersion deflector roll 53 on the exit side.

The strip plate 61 passes through the gap between the skid 59 and the immersion guide roll 60, and the acid solution 62 is discharged from the jet nozzle 79.
Is sprayed and faces the ultrasonic diaphragm 71. The ultrasonic diaphragm 71 is vibrated by the ultrasonic diaphragm 75. When the strip plate 61 passes through the flow path 54, the acid liquid 6 in the flow path 54
2 is pulled by the strip plate 61, and the acid solution 62 in the channel 54 is replaced. Therefore, as in the above, the acid tank 5
The same action as that of the jet pickling apparatus can be obtained without using 1 as a pressure resistant structure.

The pickling effect when the jet nozzle 79 is used in the above continuous pickling apparatus will be described by substance transfer. The mass transfer coefficient h _{c in} this case is expressed by Equation 3.

[0040]

Equation 3] _{h c = D / X n ·} 0.36 · (UX n / υ) 0.62

However, X _n is the pitch of the jet nozzle 79, U
Is the flow velocity of the acid solution 62, and υ is the fluid dynamic viscosity coefficient of the acid solution 62.

Thus, in the continuous pickling apparatus of the second invention, the ultrasonic vibrating plate 71 is provided in the flow channel having a rectangular cross section.
Further, by installing the jet nozzle 79, the mass transfer coefficient h _t shown in Formula 4 can be obtained.

[0043]

## EQU00004 ## h _t = h _a + h _b + h _c + h _d where h _t is the mass transfer coefficient by the continuous pickling apparatus of the second invention, and h _d is the mass transfer coefficient by ultrasonic waves.

According to the above continuous pickling apparatus, the pickling solution can be replaced without changing the pickling tank 51 to a pressure resistant structure, and the pickling effect can be improved. Further, the boundary layer is cut off by the skid 59 and the dipping guide roll 60 to promote the pickling effect. Further, by installing the ultrasonic vibration plate 71 and the jet nozzle 79, the mass transfer coefficient h _t is increased and the pickling effect is further improved.

Although the ultrasonic vibrating plate 71 and the jet nozzle 79 are provided on the upper plate 56 side of the flow path 54 in the above embodiment, they may be provided on the bottom plate 55 side or both upper and lower sides.

[0046]

According to the continuous pickling apparatus of the present invention, the pickling effect in the pickling apparatus equipped with the immersion type pickling tank is improved,
The cost of the augmenting equipment becomes cheap. In addition, the line speed can be increased and high-speed pickling of difficult-to-descale materials can be achieved. As a result,
High pickling effect can be obtained with low equipment cost.

[Brief description of drawings]

FIG. 1 is a schematic side view of a continuous pickling apparatus according to the first invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a schematic side view of a continuous pickling device according to a second invention.

FIG. 4 is a front view of a continuous pickling device according to a second invention.

5 is an enlarged view of an arrow V portion in FIG.

FIG. 6 is a schematic view of a conventional continuous pickling apparatus.

FIG. 7 is a schematic diagram illustrating an effect of pickling.

FIG. 8 is a schematic side view of a jet pickling apparatus.

9 is a view taken along the line IX-IX in FIG.

FIG. 10 is a schematic diagram illustrating an effect of pickling.

[Explanation of symbols]

 51 Acid Tank 54 Flow Path 59 Skid 60 Immersion Guide Roll 61 Strip Plate 62 Acid Liquid 71 Ultrasonic Vibration Plate 75 Ultrasonic Transducer 79 Jet Nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Etsuro Hirai, Etsuro Hirai 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Saka Adult Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture No. 6-22 Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Etsushi Hino 1-chome, Mizushima Kawasaki Dori, Kurashiki City, Okayama Prefecture (No address) Kawasaki Steel Co., Ltd. Mizushima Steel Works (72) Inventor Toshiko Toshiba Kurashiki, Okayama Prefecture 1-chome, Kawashima-dori, Mizushima, Ichi, Mizushima Steel Works, Kawasaki Steel Co., Ltd. (72) Inventor: Nanao Nanuma, 1-chome, Mizushima-Kawasaki-dori, Kurashiki City, Okayama Prefecture (72, Mizushima Works, Kawasaki, Ltd.) ) Inventor Koichi Hirase 1-chome, Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture (without street number) Kawasaki Steel Works Mizushima Works

Claims (2)

[Claims] 1. A continuous pickling apparatus equipped with an immersion type continuous pickling tank in which a traveling strip is immersed, wherein a channel having a rectangular cross section surrounding the strip is provided in the immersion type continuous pickling tank. A continuous pickling device, wherein a plurality of receiving members for sandwiching the strip are provided in the flow path along the traveling direction of the strip. 2. A continuous pickling apparatus equipped with an immersion type continuous pickling tank in which a traveling strip is immersed, wherein a channel having a rectangular cross section surrounding the strip is provided in the immersion type continuous pickling tank. An ultrasonic vibrating plate facing the plate surface of the strip plate is provided in the flow path, and a plurality of ultrasonic vibrators are provided on the ultrasonic vibrating plate so that the pickling solution is opposed to the traveling direction of the strip plate. A continuous pickling apparatus, wherein a jet nozzle for discharging toward the strip is provided in the immersion type continuous pickling tank.