JPS61213385A - Narrow gap flow type surface treatment device - Google Patents

Abstract

PURPOSE:To prevent flawing of the surface of a member to be treated by providing a means for exerting repulsive force to the member traveling in a narrow gap path in the direction opposite from the deflection direction when the above- mentioned member is deflected. CONSTITUTION:A steel strip 7 is guided by inlet guide rollers 8 and a sealing member 2 into the narrow gap path 21 of a narrow gap pickling vessel 1 and is pickled by an acid soln. having the flow toward an acid soln. discharge port 4 from acid soln. supply ports 3 and static pressure nozzles 6. The pickled steel strip is discharged therefrom. The pickling soln. is accelerated by an acceleration pump 11 and is supplied from the ports 3. The strip 7, when deflected by oscillation or catenary, approaches the discharge ports 6 of the static pressure nozzles 5 and therefore the liquid pressure near the ports 6 increases approximately to the inside pressure of the pressure accumulation part 6 of the accumulator 5 so that the contact of the strip 7 with the vessel 1 is prevented.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a narrow-flow type surface treatment device, in particular, a narrow-flow type surface treatment device for forming a suboxide flux formed on the surface of a rolled copper strip into a narrow flow of acid. The present invention relates to a narrow-flow type surface treatment device that performs surface treatment.

[Background of the invention]

Conventional surface treatment, ie pickling, of hot-rolled copper strips is carried out by passing the steel through an acid bath after pretreatment by bending and stretching.

In this acid tank, a catenary is formed in the copper strip, and a portion of the catenary is continuously guided to the acid tank to perform pickling. By bending and stretching, it is possible to remove about 70 to 80 inches of scale from the copper strip before it goes to the acid bath.

However, even with the pretreatment by bending and stretching, the pickling time is reduced by only about 1 compared to the case of a copper strip without pretreatment. This is because products generated when the scale on the copper strip is dissolved in the acid bath adhere to the steel strip, resulting in a decrease in the acid concentration near the copper strip. Therefore, in order to prevent such a decrease in acid concentration, a method is adopted in which a flow is formed in the acid solution around the copper band.

As a prior art technique for carrying out positional processing of a member to be processed by forming a flow of a processing liquid on the surface of the member to be processed, there is, for example, the Z cell process described in US Pat. No. 3,975,242.

In this conventional example, a metal strip runs continuously inside a cylindrical container with a rectangular cross section, and the processing liquid is forced to circulate in the countercurrent direction to the metal strip running inside the container, allowing high-speed plating to occur. It is a device that performs This device supports a tensioned copper strip by guide rollers, and the steel strip contacts the inside of the plating container due to the catenary of the copper strip and vibration, which causes scratches on the copper body. The structure is such that an interference plate prevents short circuits between the bands.

When such a set cell process is applied to pickling a copper strip, it is desirable to make the flow path through which the acid solution flows narrow in order to shorten the pickling time. When the copper strip is pickled in this narrow channel, the rate of formation of a turbulent layer between the steel strip and the acid solution increases, and the diffusion of the acid solution on the optical surface of the copper strip becomes insufficient. It is done. Therefore, the light surface processing speed becomes faster.

However, when the Z-cell process with the above-mentioned interference plate is used for pickling in the kfM band, if the treated section of the copper strip existing in the narrow channel of the Z-cell process is long,
The catenary of the copper strip ensures that the copper strip is always in contact with the interference plate at the bottom of the Z Cell process. After a while,
Contact with such an interference plate may cause scratches on the surface of the copper strip, and the interference plate may impede the flow of the acid solution, leading to a decrease in processing capacity.

Therefore, it is conceivable to install several set cell processes in series to increase the processing capacity of the copper strip, but this poses the problem of excessive equipment costs. Furthermore, when connecting several Z-cell process units, a joint portion must be provided at the joint between each unit, resulting in a problem that the processing time increases accordingly. In other words, when the line speed is high, such as in continuous hot rolling, it is generally necessary to pickle the steel strip in a short time using a small processing device to increase processing capacity. There is a risk that the ink installed in the area may go against the requirements for small-scale, high-speed pickling of copper strips.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a narrow-gap flow type surface treatment apparatus that does not form scratches on the optical surface of a workpiece and can quickly perform surface treatment on the workpiece.

[Summary of the invention]

In order to achieve the above object, the present invention provides a container having a substantially parallel narrow passage therein, a traveling means for traveling a workpiece to be treated within the narrow passage, and a container for displacing a surface treatment liquid within the narrow passage. flow f'
In the narrow-gap flow type surface treatment apparatus for surface-treating the steel strip, the narrow-gap flow surface treatment apparatus includes a flow forming means for forming a flow L, and the repulsive force in a direction opposite to the deflection direction of the workpiece in the narrow gap path is applied to the workpiece to be treated. This is a narrow gap flow type surface treatment device characterized by being provided with means for applying a repulsive force to a member.

In the above structure of the present invention, when a deflection occurs in the workpiece in the narrow passage due to a catenary or vibration of a steel strip, for example, a repulsive force is applied to the deflected portion in the direction opposite to the deflection direction. This eliminates the deflection of the steel strip to prevent the copper strip from coming into contact with the channel wall and causing scratches, and also eliminates the deflection so that the flow of the processing liquid in the narrow channel is not obstructed. That's what I do.

As the repulsive force imparting means, a pressure accumulating part is provided in the container, and by passing pressurized water through this pressure accumulating part, hydrostatic pressure is injected from the pressure accumulating part into the narrow gap passage, and the hydrostatic pressure is injected into the treatment target. There is a means for applying a repulsive force in a direction opposite to the direction of deflection to this deflected section by hydrostatic pressure when the deflected section of the member approaches.

The sensor detects the deflection of the workpiece in the narrow gap flow path, and outputs a signal to the coils installed above and below the container to apply magnetic force to the deflected part, in the opposite direction to the deflection direction. There is also a way to eliminate the deflection by applying a repulsive force in the direction.

[Embodiments of the Invention] Next, according to the present invention? A preferred embodiment of the gap flow type surface treatment apparatus will be described in detail with reference to the attached drawings.

Figures 1 and 2 show an embodiment of the narrow flow type surface treatment device.
It is a sectional view taken along CC in the figure.

This embodiment relates to a pickling device that can quickly remove scale generated on the surface of a steel strip by hot rolling.

In the figure, a narrow gap pickling container 1 is formed by frames facing each other with a narrow gap passage 21 interposed therebetween. Inside this narrow gap pickling container 1, a flat steel strip 7 is mounted as a roller A.

The vehicle is running under tension due to B. Guide rollers 8 are provided on the inlet and outlet sides of the narrow gap pickling container 10 of the copper strip 7. Seal members 2 are provided on the inlet and outlet sides of the copper strip 7 of the narrow gap pickling container l.

Five rows of accumulators 5 are provided at equal intervals on each of the opposing frames forming the narrow gap pickling container 1t. Each accumulator 5 is provided on one frame of the narrow gap pickling container 1, and hydrostatic pressure nozzles 6 are arranged at equal intervals in the nine parts.
There are several locations.

The accumulator 5 is provided with a pressure accumulation part 23 connected to the hydrostatic pressure nozzle 6, and a mating pipe 24 is connected to this pressure accumulation part 23 from a pipe 22. The piping 22 has a pressure valve 1.
A piping 25 is connected thereto to which the acid solution pressurized by the skin acid solution tank 2 and accumulated in the skin acid solution tank 13 is supplied.

An acid solution supply port 3 for forming an acid solution flow in the narrow gap passage 21 is provided on each of the opposing surfaces of the narrow gap pickling container 1 . A pipe 26 extending from the acid liquid acceleration pump 11 connected to the acid liquid tank 13 is connected to the acid liquid supply port 3 .

mfctR is connected to the narrow gap pickling container 1 from the acid solution supply port.
Bypass channel 1 for discharging the liquid from the acid solution outlet 11
2 is provided. The acid solution outlet 11 is filled with the acid solution
A pipe 27 for discharging the acid solution supplied from the acid solution supply port 3 is provided in the pipe 13 .

A leaked acid liquid receiving tank 9 is provided on the side of the acid liquid tank 13 of the narrow gap pickling container 1, and the center of this leaked acid liquid receiving tank 9 is connected to the leaked acid liquid outlet 10 and is connected to the acid tank 7a. 13 is provided with a pipe 28 for refluxing the leaked liquid.

The pipes 25 are connected to pipes 22 provided on each opposing surface of the narrow ff pickling container 1 and supplying the acid solution to the nine accumulators 5, respectively.

Next, the operation of this embodiment will be explained.

The steel strip 7 is guided by a guide roller 8 on the entry side, passes through a sealing member 2, and is placed in a narrow pickling container l having a flow from an acid solution supply port 3 and a hydrostatic pressure nozzle 6 to a acid solution discharge port 4. It is pickled with the acid solution and comes out of the narrow-gap pickling container 1 through the outlet-side coil member 2 while being guided by the guide roller 8 on the outlet side. At this time, the acid solution is accelerated by the acceleration pump 11 and supplied into the container 1 through the acid solution supply port 3. The acid solution supplied from the acid solution supply port 3 forms a narrow gap flow between each surface of the narrow gap pickling container and the steel strip 7. As shown in FIG. 1, two types of narrow gap flow are formed, one directed toward roll A and the other directed toward roll B. Turn to the roll person*
? The mud passes through the entire bypass path 12 and is discharged from the acid solution outlet 11 to the acid solution tank 13. On the other hand, the peeling acid solution toward the roll B is similarly discharged from the acid solution outlet 11.

Because the acid solution in the narrow gap pickling container 1 has a flow rate and the steel strip 7
Since the distance from to the container wall is small, the following equation holds true.

[Jl, ld δ, = δX123/(-17/8...(1)
■ δ = 2 δ, : Thickness of laminar flow bottom layer U, : Average flow velocity d : Pipe diameter or representative length A : Pipe cross-sectional area S : Pipe inner circumference length U : Kinematic viscosity coefficient clear from Equation 1 As the distance from the steel strip 7 to the wall of the container 1 is short, it is possible to reduce the thickness of the layer called the laminar bottom layer, where only mass transfer occurs by convection. It is possible to increase the randomness.

Therefore, it is possible to shorten the mass transfer distance to shorten the time lost to mass transfer in the laminar flow storage field, quickly diffuse the acid solution with a reduced acid concentration, and efficiently remove scale on the surface of the steel strip 7 in a short time. can.

When the length of the acid solution treatment increases, the copper strip 7 may come into contact with the inner surface of the narrow pickling container 1 due to vibration or catenary of the steel strip. This may cause scratches on the surface of the copper strip 7, or
(p) The gap may cause wear on the inner surface of the pickling container 1 and may impede the flow of the acid solution, resulting in insufficient treatment of the surface of the steel strip 7.

Therefore, when the copper strip 7 is deflected due to vibration or catenary, by approaching the discharge port 6 of the hydrostatic pressure nozzle 5, the liquid pressure near the discharge port of the hydrostatic pressure nozzle is reduced to the pressure accumulating portion 5 of the accumulator 5. The internal pressure can be approached and the steel strip 7 can be prevented from coming into contact with the narrow gap pickling container 1. At this time, the amount of water coming out of the hydrostatic pressure nozzle 6 of the accumulator 5 is small, and there is no risk of affecting the flow of the acid solution.

The above accumulator 5 is narrow FJi! The reason why it is provided also on the vertically upper side of the washing container 1 is to prevent the steel strip 7 from bending upward due to vibration.

Although this embodiment shows the case where the steel strip 7 is run horizontally, a similar device can be used also when the copper strip is run vertically.

As explained above, according to this embodiment, it is possible to remove scale from the copper strip 7 without creating scratches or dents on the surface of the copper strip 7, using small and inexpensive equipment, and in a short time.

In the pickling experiment using the narrow-flow type optical surface processing device according to the present embodiment, it took about 35 seconds to perform the prescribed pickling with a conventional catenary single-type system and a plurality of devices arranged in series. 12 seconds, which is 65 steps shorter, is sufficient to perform a similar pickling treatment.

Moreover, by performing bending and stretching as a pre-treatment before running the copper strip through the narrow-flow type clothing processing apparatus of this embodiment, the time can be further shortened by 50% to 6 seconds. therefore,
It will have a processing capacity approximately six times that of conventional pickling equipment with one catenary type.

In this embodiment, pickling is explained as the surface treatment for the steel strip 7, but it can also be applied to surface treatments such as electroplating.

(9) Although the acid solution in the acid solution tank 13 is circulated within the narrow gap pickling container, the acid solution in the tank 13 can be renewed as needed.

Furthermore, since the leaked acid liquid receiving tank 9 is provided, the required amount of acid liquid can be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to prevent the workpiece being processed through the narrow passageway from being bent, and therefore it is possible to prevent the formation of scratches on the surface of the workpiece. Furthermore, since the narrow gap flow of the treatment liquid is not obstructed, surface treatment can be carried out efficiently and quickly.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view showing an embodiment of the narrow gap flow type six-sided processing apparatus according to the present invention, and FIG. 2 is a sectional view taken along the line CC in FIG. 1. l... Narrow gap pickling container, 2... Seal member, 3...
Acid liquid supply port, 4... Acid liquid discharge port, 5... Accumulator, 6... Hydrostatic pressure nozzle, 7... Steel strip, 8...
Guide roller, 9...Leaked acid liquid receiving tank, 1O...Leaked acid liquid outlet, 11...Acid liquid acceleration pump, 12...Pressure pump, 23...Pressure accumulator.

Claims (1)

[Claims] 1. A container having a substantially parallel narrow passage therein, a traveling means for causing a member to be treated to travel within the narrow passage, and a flow forming means for forming a flow of surface treatment liquid within the narrow passage. In the narrow gap flow type surface treatment apparatus that performs surface treatment on the target member, the repulsive force is applied to the target member in a direction opposite to the deflection direction of the target member within the narrow gap path. A narrow gap flow type surface treatment device, characterized in that a means is provided.