JPH0718759Y2 - End surface coloring prevention device for chemical conversion treated steel strip - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention is to apply a chemical conversion treatment to the surface of a steel strip such as a cold-rolled steel sheet or a plated steel sheet, and then apply a treatment liquid adhering to the steel strip to a predetermined film by a ringer roll. The present invention relates to an apparatus for preventing the end faces of a steel strip from being colored by the treatment liquid remaining on the end faces of the steel strip when the thickness is reduced.

Conventional technologyManufacturing surface-treated steel sheets used for applications such as coated steel sheets
Although there is a tendency for expansion and increase with the upsizing of products in recent years,
Along with this, the amount of chemical conversion treatment as its pretreatment also increases,
The production line has also been accelerated to cope with this.

In such a surface-treated steel sheet production line, a steel strip continuously fed at a high speed is subjected to a chemical conversion treatment by a dipping method or a spray method, and then the treatment liquid is squeezed out by a Ringer roll to obtain a predetermined film. Adjusted to thickness.

In this film thickness adjusting step, since a roll gap is generated at both ends of the ringer roll according to the plate thickness of the steel strip, the processing liquid squeezed by the ringer roll passes through this portion of the meniscus of the ringer roll. It will be discharged to the output side of the ringer roll.

Therefore, as shown in FIG. 5, the end surface portion (1-
1) and the edge part (1-2), the central part (1-3) of the steel strip
Compared to the above, a so-called overcoat was generated in which the residual treatment liquid adhered more, which caused coloring of the steel strip end face (1-1) or uneven treatment due to excessive film thickness at the edge (1-2). .

Especially for the steel strip end face (1-1), when there is an as-rolled mill edge that is overwhelmingly productive, the residual treatment liquid accumulates in this recessed portion, so the degree of coloring is remarkable. , There was a problem in product use such as appearance.

As such a method for preventing uneven processing due to coloring of the steel strip end surface and excessive edge film thickness, for example, in the case of end surface coloring, after performing end surface trimming with a side trimmer or the like, chemical conversion treatment is performed. However, it is not preferable because it has drawbacks such as an increase in the number of manufacturing steps and an increase in manufacturing cost due to the use of trim tools.

As for the uneven treatment of the edge portion, a method has been proposed in which the residual treatment liquid is removed by blowing air from both sides in the thickness direction of the steel strip to the edge portion or the entire width surface of the steel strip by using an air nozzle (Japanese Patent Publication No. 53-23857, JP-A-60-208482
No. 62-198270).

However, in these methods, although the treatment unevenness of the steel strip edge portion can be reduced, it is difficult to remove the treatment liquid remaining in the concave portion of the mill edge of the steel strip end face portion, and it is not possible to prevent the end face portion from being colored, and the air Depending on the spraying method, there is a drawback that the splashes are scattered during the air spraying, and are scattered to the center side of the steel strip for which the film thickness has been adjusted, and reattached to deteriorate the quality.

Problems to be Solved by the Invention This invention is based on the conventional overcoat prevention technology.
The manufacturing cost is high with the method of post chemical conversion treatment after trimming the end surface of the steel strip, and the effect of preventing the coloration of the end surface is not obtained with the method by air blowing, and the quality is deteriorated by the splash generated by air blowing. An object of the present invention is to provide an end surface discoloration preventing device for chemical conversion treated steel strips, which prevents the disadvantage of causing the above.

Means for Solving the Problems The end surface coloring prevention device for chemical conversion treated steel strip according to the present invention is a method of removing the residual treatment liquid at the end portion of the steel strip by air blowing, so It features an air nozzle for effective removal, and an air nozzle for forming an air curtain to prevent splash splashed by the air blown from this air nozzle from splashing toward the center of the steel strip. It is what

That is, the gist of the present invention is to provide two wiping carriages on both sides of the steel strip, which are close to the ringer roll exit side and face each other with the steel strip sandwiched therebetween, so as to be relatively movable in the width direction of the steel strip. For each of the two wiping carriages, an air nozzle for removing the residual treatment liquid from the outside of the steel strip end surface portion toward the steel strip end surface portion, and an air nozzle for splash splash prevention from the steel strip center side to the steel strip edge portion, It is an end surface coloring prevention device provided so as to face each other.

The wiping carts located on both the front and back sides of the steel strip are mounted on the rails, which are located in the widthwise direction of the strip on the front and back sides in close proximity to the ringer roll exit side. They are installed so that they can be moved relative to each other via screws.

The residual treatment liquid removal air nozzle and the splash splash prevention air nozzle attached to each carriage one by one are attached to the nozzle header suspended from the steel strip on the wiping carriage at a desired interval, Further, the residual treatment liquid removing air nozzle is attached from the outside of the steel strip end surface portion toward the steel strip end surface, and the splash splash prevention air nozzle is attached from the steel strip center side toward the steel strip edge portion.

When removing the residual treatment liquid, the residual treatment liquid on the end face of the steel strip is removed by the air jetted from the residual liquid removing air nozzle mounted from the steel strip side toward the steel strip end face, and Splash generated by air blowing is prevented from splashing to the steel strip by providing an air curtain with a splash splash prevention air nozzle that is installed from the center of the steel strip toward the steel strip edge. is there.

Embodiment FIG. 1 is a front view showing an embodiment of the device of the present invention, FIG. 2 is a vertical sectional side view taken along the line II-II in FIG. 1, and FIG. 3 is an enlarged view of a nozzle header portion on one side of the same device. FIG. 2 is a cross-sectional plan view taken along the line III-III, and FIG. 4 is a front view showing the nozzle header part of the same with a part thereof cut away.

In the figure, (2) is a ringer roll, (3) is a wiping carriage, and (4) is a nozzle header.

The wiping trolley (3), in which two units are arranged on each side of the steel strip (1), has a rail (5) horizontally arranged in the width direction of the steel strip (1) close to the exit side of the ringer roll (2). The ball screw (6) is screwed onto a ball screw (6) that is placed on the top of the rail and is threaded in the opposite direction at the boundary of the pass line center, and the positioning screw (7) is installed at the end of the rail. ) Is rotated to relatively move in the width direction of the steel strip. (8) is a ball screw bearing.

The nozzle header (4) is composed of a vertical member (9-1) integrally attached to each of the wiping carriages (3) and a horizontal member (9-2) horizontally protruding from the member in the width direction of the steel strip. , An air nozzle (1) for removing the residual treatment liquid at the bottom of the vertical member (9-1).
(0) is attached so that the angle can be adjusted from the outside of the steel strip end surface toward the steel strip end surface, and a splash splash prevention air nozzle (11) is attached to the steel strip edge portion at the tip of the horizontal member (9-2). It is attached so that the angle can be adjusted.

The residual treatment liquid removal air nozzle (10) is attached to the end surface of the steel strip (1) at an angle at which air is jetted, and the splash splash prevention air nozzle (11) is attached to the residual treatment liquid removal air nozzle (10). ) Is attached to a steel strip edge portion near the end surface of the steel strip against which the air jetted by the air is jetted from the steel strip center side toward the steel strip edge portion.

The air to the residual treatment liquid removal air nozzle (10) and the splash splash prevention air nozzle (11) is passed through the nozzle header (4) from the through holes (12) (13) provided in the vertical member (9-1). Air is supplied to both nozzles, and the pressure and flow rate of the air can be adjusted independently.

The chemical conversion-treated steel strip (1) has the treatment liquid squeezed out by the Ringer roll (11) and adjusted to a predetermined film thickness,
As for the steel strip end surface, the air nozzle (10) for removing the residual treatment liquid and the splash attached to each of the four wiping carriages (3) set in advance by the two positioning motors (7) Air is jetted from the scattering prevention air nozzle (11). At this time, the pressure is adjusted so that the injection pressure of the splash scattering prevention air nozzle (11) is equal to or higher than the injection pressure of the residual treatment liquid removal air nozzle (10).

An air curtain formed by removing the residual treatment liquid on the end surface of the steel strip by the air jetted from the treatment liquid removal air nozzle (10) and spraying it from the splash splash prevention air nozzle (11). (14) blocks the splash of splash to the center of the steel strip.

The distance L between the end surface of the steel strip (1) and the residual liquid removing air nozzle (10) is set to be as constant as possible with respect to the width variation or meandering of the steel strip. Change and set.

Effect of the Invention Since the invention is constructed as described above, it has the following effects.

In addition to the air nozzle for removing the residual treatment liquid on the end surface of the steel strip,
Since the air nozzle for splash splash prevention is provided, not only can the coloring of the end surface of the steel strip due to the residual treatment liquid be prevented, but also splash splash on the steel strip can be prevented, so that the product surface quality can be improved.

Since the nozzle header is attached to the wiping carriage that is movable in the width direction of the steel strip, it is possible to follow the width variation of the steel strip.

Since the wiping trolleys are placed opposite to each other with the steel strip sandwiched between them, the air nozzle may come into contact with and damage the steel strip even if there is a problem such as when the steel strip suddenly meanders or when the steel strip width is changed. Absent.

By independently adjusting the injection pressure and flow rate of the residual treatment liquid removal air nozzle and splash scattering prevention air nozzle, air is jetted at an appropriate pressure according to the amount of residual treatment liquid, plate thickness, and plate width. Can be made.

By adjusting the jet angle of the residual treatment liquid removing air nozzle and the splash scattering prevention air nozzle, it is possible to jet air at an appropriate angle even for steel strips having different strip widths.

An air curtain formed by an air nozzle for splash splash prevention can improve processing unevenness due to excessive film thickness at the edge of the steel strip.

[Brief description of drawings]

FIG. 1 is a front view showing an apparatus according to an embodiment of the present invention, FIG. 2 is a vertical sectional side view taken along the line II-II in FIG. 1, and FIG. 3 is an enlarged view showing a nozzle header portion on one side of the same apparatus. 2 Fig. 3 is a cross-sectional plan view taken along the line III-III, Fig. 4 is a front view showing the nozzle header part of the same with a part thereof cut away, and Fig. 5 is a perspective view showing a part of the chemical conversion treatment steel strip. 1 …… Steel strip 2 …… Ringer roll 3 …… Wiping cart 4 …… Nozzle header 10 …… Air nozzle for removing residual treatment liquid 11 …… Air nozzle for splash splash prevention

Claims (1)

[Scope of utility model registration request] 1. A device for squeezing a steel strip that has been subjected to chemical conversion treatment with a ringer roll, and removing with air the residual treatment liquid on the end face of the steel strip that cannot be removed by the ringer roll, which is close to the ringer roll exit side. Then, two wiping carriages facing each other across the steel strip are provided on both sides of the steel strip so as to be movable relative to each other in the width direction of the steel strip. From the steel strip toward the end face of the steel strip, and an air nozzle for splash splash prevention from the center of the steel strip toward the edge of the steel strip, which are provided to face each other. End surface coloring prevention device for chemical conversion treated steel strip.