JPH02502169A - Removal of excess coating fluid from strip material moving upward and vertically - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an apparatus for removing excess coating liquid from continuous strip material.

Drainage occurs when continuous strips of material emerge from the bath or other coating area. Ic a gas stream or jet laterally and substantially perpendicular to the coated surface. Directly removing excess coating liquid from the continuous strip material is a common practice. It is. This gas is usually air, superheated steam or other suitable medium. . This coating fluid can be used with paint, glue, molten metal, or other common coatings. Examples of strips that are liquids and for which special coatings are of course appropriate include paper, metal, etc. or other highly flexible strips that can be rolled up in long lengths, e.g., several thousand meters long.

Although the present invention can be used for general jet stripping as described above, basically The pieces exit the molten metal bath substantially vertically to remove excess coating near the edges of the pieces. With regard to this, the present invention will be described below primarily with respect to this specific application.

Known and generally preferred in continuous hot dilag metal coating processes One method is to use a jet stream to remove excess metal from the metal piece. The ripping means moves the molten metal coating through the zone containing the molten metal. Align the coated strips as soon as they come out of the coating bath to allow the coating to harden and Winding the coated strip after it has cooled.

This jet stripping means is basically a pair of linearly extending gas strips. Contains nozzle. These gas nozzles are placed substantially horizontally and narrowly on each side of the strip. The coating on one side is still in a molten state when it reaches the stripping zone. so that it is placed at a distance above the surface of the coating bath. stripping jet The lateral span of the jets is generally larger than the width of the strip passing between these jets. Hey. Form and shape of nozzle.

Jet spans, gas pressures used, etc. will vary substantially.

The removed coating simply flows from the stripping zone into the bath. It's dayu. The above-mentioned jet stripping device will be described below as cormorant.

A common occurrence in the use of the device described above is that the thick coating It occurs in or near the area.

In extreme cases, this thick coating can extend up to 30cm from the edge, but in general is approximately 5 to 6 IIJ from the edge.

Until now, this issue has been addressed in Australian Patent Nos. 453.826 and 543. This problem has been solved by using the device described in No. 722. But the criticality is that the strip velocity is These devices were found to be less effective overall when .

This critical speed is approximately 10 to 60 meters per minute, depending on the proportion of the coating liquid. It is an object of the present invention to eliminate the above edge coating problem even when the strip velocity is below the critical velocity. The purpose is to provide a stripping device ff1l that does not occur.

For this reason, the present invention provides a method for removing excess coating liquid from the vertically moving strip. In the apparatus, a gas stream extending laterally of the coated surface of the strip is applied onto the surface. means oriented in a qualitatively vertical direction and a vertical portion provided to the edge of said strip; and any non-vertical portion below the vertical portion that curves away from the edge. The buckle plate in the abutting area of the gas flow and the buckle plate are fixed along the first grade. a carrier plate that is movable toward and away from the edge of the strip; a carriage that hangs down and a means for bringing the carriage tf:a close to one edge; and the spacing between the edge of the strip and the vertical portion is maintained at tti & small so as to substantially extend onto the top of the strip. Includes a uniform thickness coating on the carrier plate. The extractor is fixedly set, and the suction end of the extractor is located near the non-vertical portion. The vertical part of the buckle plate is interrupted to prevent excess coating liquid from being removed. It consists of a device for removing excess coating liquid.

Preferred embodiments of the invention are described below with reference to the accompanying drawings, which are given by way of example only. state

FIG. 1 is a partial perspective view of the apparatus of the present invention.

FIG. 2 is an end elevation view taken along line 2--2 of FIG.

FIG. 3 is a cross-sectional view taken along line 6--3 in FIG. 2.

Referring first to Figures 1 and 2, a billet 1 is shown. This piece of steel 1 Vertical rise and excess coating from continuous hot dip coating bar It is in a state where it has liquid. This steel piece 1 is removed by removing excess coating by a known method. between a pair of linearly extending gas nozzles on either side of the billet to remove is passing through. These nozzles are not shown in the drawings as they are known.

A baffle 2 according to the present invention is provided on both sides of the moving copper piece 1. This baffle 2 is a stripping jet, i.e. a jet to drain excess liquid, at the edge of billet 1. It has the effect of changing the flow of the cut. Only one of the two baffles is shown in the diagram. It is shown together with its cooperating equipment.

The baffle 2 is made of an elongated sheet steel piece, and has a straight vertical part 3A and a straight bottom part. 3B and a non-vertical portion included in the arcuate transition portion 30.

Pubful 2 is fixed to the green carrier plate 4.

The carrier plate 4 is fixed at its upper end to the track 6. 2) To Nga 5 Supported. This track 6 has a row 27.8 and a pair of rows as shown in FIG. It is possible to run freely along the rail 9. This track 6 supports the yoke 1o9. I have it.

This yoke is such that the roller 11 can be mounted on the side edge of the steel piece 1.

Move the track 6 towards the billet 1 so that the rollers 11 carry the side edges of the billet 1 5 Therefore, this rail 9 is inclined downward by about 5° to 10° from the horizontal toward the steel piece. ing.

The devices mentioned above are known. In such a known device, the feeding speed of the steel billet is the critical speed. and 200 m/min is found to be satisfactory. . However, if the speed drops below 60 m/min, the quality of the edge may deteriorate. know. In order to solve this problem, in the present invention, the extractor 20 is 4, and the carrier plate 40 extends from both sides of the extractor 20 in half. Extends in the radial direction. This extractor 20 has a suction end located near the transition section 3C. The vertical part of the flap 2 is positioned at 5 so that it opens through three people.

As best shown in FIG. 3, this extractor consists of a tube member 21; 21 has a suction end 22, a discharge part 23, and a pressure introduction nozzle 24. Current When high pressure gas is provided to the nozzle 24, as understood by those skilled in the art, the extractor 2o A flow from the suction end 22 to the discharge section 23 is generated. This kind of flow is at the suction end 2 2. Generates suction force. When the billet speed drops below the critical speed during operation, high-pressure air flows into the nozzle. It is supplied to the drain 24. The suction force at the suction end near the edge of steel billet 1 is Excess coating metal is sucked and discharged from the edge of the discharge portion 23.

The high pressure air supplied to the nozzle 24 contains a combustible part so that the track 6 can move. It is fed through a pipe 25 that connects to the pipe 25.

In the preferred embodiment, the internal shape of the extractor 20 includes a circular suction lip 26. Ru. This lip 26 smoothly continues into the first internal bore section 27 and then into the second internal bore section. Continuing to 28.

This second internal bore portion 28 is coaxially aligned with and further from the first internal bore portion 27. It has a slightly larger inner diameter. The smooth-shaped transition portion 29 is connected to the first hole portion 27. The second hole portion 28 is interconnected. The second hole section 28 goes directly to the discharge section 23 They are connected. Once in this position, the molten coat contacts the walls of the first hole portion 27. The contacting metal crosses the transition portion 29 and contacts the side surface of the second hole portion 28 from there. Instead, it is blown out to the contact discharge section 23.

Such a structure has been found to prevent coating metal buildup within the extractor 20. There is.

A significant amount of high pressure air is directed to the nozzle 24 to provide the desired suction force to the suction end 22. must be supplied. This naturally increases the operating costs of the extractor. others Determine the dimensions that will provide the maximum suction power for a given amount of flow delivered to the nozzle 24. Considerable research has been conducted to find out.

It can be seen that a certain minimum length is required for the suction force generated at the suction end 22. Ru. This suction force initially increases as the length L increases. However, L increases further Then, friction loss finally occurs in the extractor and the suction force at the suction end 22 decreases. occurs.

The optimum effect is obtained when the length L ax of the extractor from the nozzle 24 to the discharge part 23 is 7D. It has been found that this can be obtained when it is in the range of -12D. Here D is the first internal hole Refers to the inner diameter of the portion 27.

Preferably, Lex is 98D.

In addition, the distance from the suction end 22 to the end of the steel piece 1 is preferably in the range of 8u to 0.6D. The optimum distance from the nozzle 24 to the transition section 29 is in the range of 0.5D to 1D.

In the preferred embodiment, the nozzle 24 has a diameter of 5u and extends along the longitudinal axis of the extractor 20. On the other hand, it is tilted backwards by 15 degrees. The distance from the suction end 22 to the nozzle 24 is approximately It is about 1.5D. The gauge pressure supplied to the nozzle 24 is approximately 400 KI)a. D is 24aa.

The internal cross-sectional shape of the extractor may be other than circular, in which case the first internal bore portion 27 The cross-sectional area should be four times the value divided by its perimeter.

As mentioned above, this extractor 20 is used when the chip velocity is below a critical velocity.

When the billet velocity exceeds the critical billet velocity, the air supplied to the nozzle 24 is stopped. (S) The IJ lapping device, that is, the device for discharging excess molten metal, is a well-known method. As will be understood by those skilled in the art, 5. , when the copper piece speed becomes less than the critical speed, Pressurized air 1 is supplied to the nozzle 24 and produced at the suction end 22 of the extractor 20 The suction force serves to remove excess molten metal from the edges of the steel billet 1.

The extractor of the preferred embodiment had first and second aperture sections, the aperture sections having first and second aperture sections. Items with the same diameter can also be used.

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Claims (2)

[Claims] 1. A device for removing excess coating liquid from a vertically moving strip, the device comprising: a gas stream extending laterally to the coated surface of the strip substantially perpendicular to the surface; a vertical portion provided to the edge of said strip and below said vertical portion; said gas stream having a non-vertical portion bent away from said edge; A baffle plate in the abutting area and a carrier that fixes the baffle plate along one edge. a plate, the carrier plate being movable toward and near the edge of the strip and depending from the carrier plate; a carriage for approaching the strip edge; and a section perpendicular to the strip edge; The coating material has a substantially uniform thickness over the width of the strip, keeping the spacing to a minimum between minutes. the extractor is fixedly set to the carrier plate; The suction end of the extractor interrupts the vertical portion of the baffle plate near the non-vertical portion. An excess coating liquid extraction device for extracting excess coating liquid. . 2. A thin line moving substantially upwardly and vertically as described with reference to the accompanying drawings. Excess coating liquid extraction device for removing excess coating liquid from the piece.