JPH03122277A - Differential pressure sealing device - Google Patents

Abstract

PURPOSE:To apply high differential pressure sealing without contaminating or damaging the surface of a thin strip by providing a sealing attachment on a guide roll to form two concave circular sealing surfaces and blowing a high- rpressure gas in the opposite direction to the traveling of the strip. CONSTITUTION:The guide roll 2 is surrounded by the sealing attachment 3, and the concave circular sealing surface S1 for forming a tiny gap alpha, a second circular sealing surface S2 at a winding area and a slit (t) communication with the surface S2 are formed. A high-pressure gas is uniformly injected on the second circular sealing surface S2 in the cross direction of a long-sized thin strip 1 from a nozzle group 4 in the opposite direction to the traveling of the strip 1. The strip 1 is firmly attached to the guide roll 2 by the high-pressure gas. Consequently, the strip is not vibrated in traveling or cracked, and its surface is not damaged or contaminated by the dirt deposited before treatment.

Description

Detailed Description of the Invention (Industrial Field of Application) While continuously feeding a long ribbon, such as a cold-rolled or hot-rolled steel strip, it is subjected to vacuum deposition, ion blasting, etc. When surface treatment is performed using a so-called dry rating method such as sputtering, air-to-air (Air- (to-Air) method is used. The present invention relates to a differential pressure sealing device suitable for guiding the passage of a long ribbon while maintaining the pressure difference between the differential pressure chambers.

(Prior art) Regarding the air-to-air method, for example, U.S. Patent No. 2
No. 384500, No. 2972330, No. 299641
Including Specification No. 0, Mitsubishi Heavy Industries Technical Report Vol. 1.21 (1
984) H6 p1 to p7, etc., are being put into practical use in conjunction with recent advances in precision machining technology.

Of these sealing methods, especially in the last cited document, a long material is sandwiched between a pair of rolls whose axes are slightly shifted in the direction of threading, and the long material is placed along the circumferential surface of each roll. Recently, Japanese Patent Application Laid-Open No. 13572/1983 has proposed a method of expanding the sealing area by combining a pair of threading rolls with a sealing bar and an adapter that encloses a long material. Attempts to maintain differential pressure have been proposed, but in either case, the long material is pressed between a pair of rolls and passed through, so bending stress and compressive stress act on the front and back surfaces of the workpiece. , and is also subjected to large amounts of tension.

The effects of such tension and local surface pressure have a negative impact on product quality, and for example, when applying the air-to-air method to unidirectional silicon steel sheets, they can cause deterioration of magnetic properties. Understood.

In addition to the above-mentioned problems, temporary cracks are likely to occur due to vibrations during the threading of long strips, and dirt and surface scratches may occur due to dust that has adhered during the conveyance process of long strips. It has been pointed out that

(Problems to be solved by the invention) During the threading of a long thin strip, strong surface pressure that causes quality deterioration may occur, temporary cracking may occur due to vibration of the long thin strip during threading, or the thin strip may be transported. It is an object of the present invention to propose an apparatus that can realize a higher differential pressure seal without generating dirt or surface scratches due to dust attached during the process.

(Means for Solving the Problems) The present invention includes a single guide roll that guides the winding of a long ribbon at the boundary between spatial regions where there is a pressure difference, and a single guide roll that guides the winding of a long ribbon at the boundary between spatial regions where there is a pressure difference. A concave arc-shaped sealing surface that surrounds the long thin strip and forms an extremely small gap with the outer peripheral surface of the guide roll except for the winding area of the long thin strip, and the back surface and both side edges of the long thin strip in the winding area. Also, there is a second concave arc-shaped sealing surface that directly forms an extremely fine gap, and a concave arc-shaped sealing surface that extends in the tangential direction of the guide roll at the back of the second concave arc-shaped sealing surface, which is much larger than the cross-sectional dimension of the long ribbon. The high-pressure gas is sprayed onto the second concave arc-shaped sealing surface in a direction opposite to the traveling direction of the long ribbon during the conveyance process. This differential pressure sealing device is characterized in that a group of nozzles are arranged to emit air to the atmosphere through a gap formed between the sealing surface and the guide roll.

Here, in this invention, a plurality of grooves are provided in a direction intersecting the longitudinal direction of the long ribbon on the second concave arc-shaped sealing surface that directly forms a minute gap with the back surface of the long ribbon in the winding region. It is better to form

Now, Fig. 1 (a), (b), and (c) show an example of a device according to the present invention in which the pressure is increased from atmospheric pressure P to pressure P in the order of the subscript number, and number 1 in the figure is a long thin Obi, 2
For example, is a single guide roll that guides the winding of the long ribbon 1 at the boundary between a space where the pressure is P1 and a space where the pressure is P0, and although this guide roll 2 is not shown, a bearing is supported. Then, the long thin ribbon 1 is wound at a preset winding contact angle e. Reference numeral 3 denotes an attachment, which surrounds the outer circumference of the guide roll 2 over approximately half the circumference and forms an extremely small gap α with respect to the outer circumferential surface of the guide roll 2 except for the area where the thin ribbon 1 is wound. There is also an extremely fine gap α1 between the concave arc-shaped sealing surface Sl and the back surface and both edges of the ribbon l in the winding region. Second concave arc-shaped sealing surface S directly forming α2
2, and a slit t which is connected to the sealing surface S2 in the tangential direction of the guide roll 2 and has a much larger opening than the cross-sectional dimension of the ribbon l. Also, 4 is header H
This nozzle group 4 blows high-pressure gas in the opposite direction to the traveling direction of the long ribbon l in the conveying process and releases this gas to the atmosphere through the gap α1. It is provided on the second concave arc-shaped sealing surface S2 of the attachment 3 so that the spray can be sprayed uniformly across the width of the long ribbon 1. Note that the mechanism for blowing high-pressure gas by the nozzle group 4 is not limited to that shown in the drawings, and may be of any other type. Also, 5 is the casing k
Similarly, 6 is a second differential pressure chamber, and 7 is a third differential pressure chamber. In order to maintain a higher differential pressure in the differential pressure sealing device configured as described above, at least the concave arc-shaped sealing surface S of the attachment 3 is required as shown in FIG. A plurality of grooves 3a can be provided in a direction intersecting the longitudinal direction of the long ribbon 1. This groove 3a has a width of 0.
1-10mm.

Depth 0.01~5mm, interval (pitch) 1~20m
It is preferable to have a plurality of linear shapes of about *+, and the cross-sectional shape may be any shape. 3(a)(g)) show the appearance of the sealing attachment 3 of the device shown in FIG. 1 above, and FIG. 4 shows the appearance of the sealing attachment 3 of the device shown in FIG. 2 above. Illustrated for easy understanding. In addition, in the example shown in FIG.
．． Differential pressure (P+ Pg) between questions 6 and 6.7, (Pg
Since Pz) is much smaller than (Pm - p+), a pair of rolls 8 and 9 whose axes are shifted in the threading direction is used.
The case using a roll seal according to the above is shown.

(Function) The long ribbon 1 is wound around the guide roll 2 and fed through an extremely small gap under a particularly high differential pressure from atmospheric pressure P0 to pressure P in the first differential pressure chamber 5. Moreover, at this time, a relatively large turbulent flow is actively generated in the minute gap α by high-pressure gas such as air, nitrogen, or argon gas jetted from the nozzle group 4 of the second concave arc-shaped sealing surface S2. Therefore, a higher differential pressure seal can be realized without being subjected to strong surface pressure that causes quality deterioration. Further, since the long ribbon l is firmly brought into close contact with the guide roll 2 by this high-pressure gas, temporary cracking caused by vibration of the ribbon l is effectively avoided.

In addition, in the case shown in Fig. 1, the gap α2 must be allowed to some extent if the width of the long ribbon 1 changes; This can be dealt with as appropriate by setting up the following.

(Example) The apparatus shown in FIG. 2 shows an example in which a high differential pressure from atmospheric pressure P to pressure P and further from Pt to P can be more advantageously achieved by repeating the differential pressure seal twice according to the present invention. A cold-rolled steel plate having a thickness of 0.20 m1w and a width of 500 gam was passed through the test tube at a line speed of 15 a/sin, and the sealing condition of each differential pressure chamber was investigated. The results are shown in Table 1, and it was confirmed that according to the present invention, not only a high differential pressure could be maintained, but also no temporary cracks, no stains due to adhesion of dust, and no surface scratches.

(Effects of the Invention) Thus, according to the present invention, not only can a higher differential pressure be maintained, but the plate is not subjected to strong surface pressure that causes quality deterioration, and the plate It is possible to effectively avoid surface flaws, dirt, etc. caused by cracks and dust attached to the surface of the ribbon before processing.

[Brief explanation of drawings]

Figures 1(a), (b), and (C) are explanatory diagrams of the configuration of the differential pressure sealing device according to the present invention, Figure 2 is a diagram showing another example of the differential pressure sealing device according to the present invention, and Figure 3(a) )(b) and FIG. 4 are perspective views of essential parts of the differential pressure sealing device according to the present invention. 1... Long ribbon 2... Guide roll 3.
...Sealing attachment 3a...Groove 4...Injection nozzle 5...
-First differential pressure chamber 6...Second differential pressure chamber 7...Third differential pressure chamber 8, 9...Seal roll S1...Concave arc sealing surface...Second concave arc shape Seal surface α8. α2...Small gap

Claims (2)

[Claims] 1. A single guide roll that guides the winding of the long thin ribbon at the boundary between spatial regions where there is a pressure difference, and a single guide roll that surrounds the outer circumference of this guide roll for approximately half the circumference, excluding the winding area of the long thin ribbon. A concave arc-shaped seal surface that forms an extremely small gap with respect to the outer peripheral surface of the guide roll, and a second recess that also directly forms an extremely small gap with the back surface and both side edges of the long thin strip in the winding region. An attachment having a slit connected to the arcuate sealing surface and the second concave arcuate sealing surface and opening in the tangential direction of the guide roll much larger than the cross-sectional dimension of the long ribbon; High-pressure gas is blown onto the concave arc-shaped sealing surface of No. 2 in the opposite direction to the traveling direction of the long ribbon during the conveyance process, and the high-pressure gas is passed through the gap formed between the sealing surface and the guide roll to the atmosphere side. A differential pressure sealing device characterized by having a group of nozzles arranged to emit water. 2. Claim 1: A plurality of grooves are formed in a direction intersecting the longitudinal direction of the long ribbon on the second concave arc-shaped sealing surface that directly forms a minute gap with the back surface of the long ribbon in the winding region. The differential pressure sealing device described in .