JPH072991B2 - Differential pressure seal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) Long strips, for example, vacuum deposition, ion plating, sputtering during continuous feeding of long strips such as cold rolled or hot rolled steel strips. When applying the surface coating by so-called dry plating method such as, etc., the vacuum degree is sequentially increased and then lowered until reaching the dry plating area by the mutual space areas having a plurality of pressure differences (hereinafter referred to as differential pressure chambers). The air-to-air system is used to maintain the pressure difference between the differential pressure chambers and to induce a differential pressure seal that guides the continuous passage of long material. It is an object of the present invention to propose a differential pressure seal device which is necessary and can advantageously realize an appropriate differential pressure seal.

(Prior Art) A number of proposals regarding the air-to-air system can already be seen, for example, US Patent Nos. 2384500 and 2972330.
No. 2996410 specification, Mitsubishi Heavy Industries Technique Vol.21
(1984) No. 6, p125-131, Vacuum: Volume 30, (1987),
No. 10, p775-785, Nisshin Steel Engineering No. 51: (1984), p9
3 to 101, etc., are being put to practical use in combination with recent advances in precision machining technology. Among these sealing methods, especially in the last cited document, the long material is placed along the circumference of each roll by sandwiching it between a pair of rolls whose axes are slightly offset from each other. Recently, increasing the area of the seal has been recently extended to JP-A-62-13572.
In the gazette, an attempt is made to maintain a differential pressure inside the enclosure by combining a seal bar and an adapter for enclosing a long material with a pair of threaded rolls. , Since a long material is pressed between a pair of rolls and passed through,
The object to be processed is subjected to bending stress and compressive stress on its front and back surfaces, and is also subjected to large tension.

It has been found that such a tension or local action of surface pressure adversely affects the quality of the product and causes deterioration of magnetic properties when the air-to-air method is applied to, for example, a grain-oriented silicon steel sheet. .

Recently, in addition to such a problem, especially when a brittle long thin strip such as the above-mentioned silicon steel plate is targeted, due to the contact with the sealing device main body due to the vibration of the strip during continuous striping, It has been pointed out that plate cracks tend to occur.

(Problems to be Solved by the Invention) An object of the present invention is to adapt to the treatment of a long thin strip by the air-to-air method, and to obtain an effective difference without any happiness that causes deterioration of product quality or plate cracking. It is to propose a differential pressure seal device that can realize a pressure seal.

(Means for Solving the Problem) The present invention relates to a pressure seal for inducing continuous passage of a long ribbon while maintaining the pressure difference across the space regions having the pressure difference. At the boundary between
A single magnetic body dide roll that guides the winding of the long strip, and is arranged so as to surround the periphery of the long strip, and a part of one of the facing surfaces is on the guide roll. It is formed in a shape close to the ribbon surface and along the ribbon surface, a part of the other opposite side is close to the guide roll outer peripheral surface, and the tip is on the guide roll outer peripheral surface. A side surface structure that is formed along the outer surface of the guide roll and is connected to the outer surface of the roll so as to keep the opposing portions substantially airtight. Is a sealing attachment having a sealing attachment, and one or more magnet body sealing rolls that rotate in synchronization with the guide rolls are arranged in the sealing attachment. TMG, of the sealing attachment so that it can correspond to a plate of thickness change of the long strip to be processed, may want to make it possible to slide the part close to the ribbon surface on the guide roll up and down.

1 (a), (b) and (c) show partial examples of the differential pressure sealing device according to the present invention. In the figure, 1 is a long thin strip, 2 is a magnetic guide roll, 3 is a sealing attachment, and this sealing attachment 3 is provided with a magnet seal roll 3a that is in close contact with the guide roll 2 and rotates synchronously. There is. 4 is the first differential pressure chamber,
Reference numeral 5 is a second differential pressure chamber, 6 is a third differential pressure chamber, and the long ribbon 1 is a subscript from below atmospheric pressure p ₀ while maintaining the pressure difference between the space regions having the pressure difference. The degree of vacuum is increased to the pressure p in the order of, but here, the case where this differential pressure sealing device is used between the space regions of (p ₀ )-(p ₁ ) having the highest differential pressure value will be described.

The guide roll 2 is supported by the inlet side of the differential pressure chamber casing 7 corresponding to the boundary between the regions, and the long thin strip 1 is provided on the outer circumference of the guide roll 2 at a preset winding contact angle θ. To wind up.

The sealing attachment 3 surrounds the outer circumference of the guide roll for almost half the circumference, and forms a very small gap δ ₁ with respect to the outer peripheral surface of the guide roll 2 except for the winding area of the long thin strip 1. As shown in FIGS. 1 (b) and 1 (c), the surface s ₁ and its AA cross section and BB cross section are also polar to the back surface and both side edges of the long thin strip 1 in the winding area. The second concave arc-shaped seal surface s ₂ and the second concave arc-shaped seal surface s ₂ that directly form the very small gaps δ ₂ and δ ₃ , δ ₃ ′, are connected to the second concave arc-shaped seal surface s ₂ and are tangential to the guide roll 2. In the direction, a slit t having a much larger opening than the cross-sectional dimension of the long thin strip 1 is provided. Its appearance is shown in Fig. 2 (a).
And the concave arc-shaped sealing surface s ₁ , s facing the guide roll 2
₂ is illustrated in FIG. 2 (b) for easy understanding.

3 (a) and 3 (b) show a portion of the above-mentioned sealing attachment 3 which is particularly close to the long strip 1 wound around the guide roll 2 (hereinafter referred to as a slider).
It is a diagram illustrating a structure in which only 3-1 is slid up and down according to the plate thickness of the ribbon to be processed. A seal member (not shown) is provided between the slider 3-1 and the attachment body 3-2 to help maintain a differential pressure. Note that the differential pressures (p ₁ -p ₂ ) and (p ₂ -p ₃ ) between the differential pressure chambers 4, 5 and 5, 6 in Fig. ₁ are much higher than the above-mentioned (p ₀ -p ₁ ). Because of its small size, it shows the case of using a roll seal composed of roll pairs 8 and 9 whose axial center is displaced in the plate passing direction.

(Operation) In the apparatus having the above configuration, the long thin strip 1 is wound around a single guide roll 2 so as not to receive a strong surface pressure, and the atmospheric pressure (p ₀ ) is passed through the minute gap δ _2. Is advanced to the pressure (p ₁ ) in the first differential pressure chamber 4. At this time, in the minute gap δ ₁ , the magnet body seal roll 3a (hereinafter referred to as the magnet roll 3a
Is described) and the guide roll 2 is in a state of being suction-adhered. Therefore, in the differential pressure seal device according to the present invention,
An effective differential pressure seal can be achieved without any hurt such as quality deterioration due to local surface pressure.

As shown in FIGS. 4 (a) and 4 (b), the magnet body sealing roll 3b (on the sealing surface S ₂ of the sealing attachment 3 is shown as a case where the quality characteristics are not affected even if the surface pressure due to the weight of the roll is applied. In the following, an example in which a magnet roll 3b) is provided to realize a higher differential pressure seal is shown.

When it is necessary to process a long thin strip in which the local surface pressure adversely affects the quality characteristics by using the differential pressure sealing device having such a structure, the cross section of the magnet roll 3b is schematically shown. As shown in FIG. 5, a double structure in which a magnet 10 is provided on the outside of the roll and a lightweight member 11 such as Teflon, hard rubber, or carbon is provided on the inside thereof (or vice versa).
Therefore, it is effective to reduce the roll weight.

The magnet roll disposed on the sealing attachment 3 has a roll surface roughness of which the center line average roughness Ra = 10 to 0.1.
By forming a relatively rough surface of about μm, it is possible to magnetically adhere Fe powder or the like adhering to the guide roll 2 to a magnet roll and prevent pinholes (also called pickups or push marks) in long thin strips. Become.

In addition, this magnet roll should be structured so that it can be displaced in the axial direction of the guide roll 3 by using a spring or the like without fixing the bearing that supports it in order to effectively operate its function, and its diameter. Is preferably small in diameter from the viewpoint of the structure of the differential pressure sealing device or from the economical point of view, and specifically, it is preferably 1/2 or less of the diameter of the guide roll.

(Example) Example-1 A differential pressure sealing device having a sealing attachment 3 having a structure in which a magnet roll 3a is disposed on a sealing surface s ₁ as shown in FIG. 0.20 mm, board width 500 m
Pass a steel plate of m at a line speed of 15 m / min, and (P ₀ ) ~
The differential pressure situation between (P ₁ ) was investigated. The result is the magnet roll 3a
It is shown in Table 1 together with the investigation results of the differential pressure seal device which does not have.

As is clear from Table-1, according to the present invention, it is clear that a high differential pressure can be maintained.

Further, when the same investigation as above was carried out with the device equipped with the sealing attachment 3 shown in FIGS. 4 (a) and 4 (b), the result of P ₁ = 70 Torr was obtained, and a higher differential pressure can be maintained. Was confirmed.

Example-2 A minute gap δ ₂ as shown in FIGS. 3 (a) and 3 (b) above.
Using a differential pressure seal device equipped with a sealing attachment 3 that can be changed appropriately, adjust the minute gap δ ₂ to an appropriate gap, and then adjust the stainless steel plate thickness (0.20 mm, 0.70 mm, 1.5 mm) (C : 0.015%, Si: 0.019%, Cr: 18.9%, P:
0.007%) was passed at a line speed of 20 m / min, and the differential pressure condition between (P ₀ ) and (P ₁ ) at that time was investigated.

As a result, for a 0.20 mm thick steel plate (P ₀ ): 760 Torr- (P ₁ ):
100 Torr, 0.70 mm thick steel plate (P ₀ ): 760 Torr- (P ₁ ): 11
When the plate thickness was ₀ Torr and the plate thickness was 1.5 mm, the result was (P ₀ ): 760 Torr- (P ₁ ): 115 Torr, and it was confirmed that a high differential pressure could be maintained.

(Effect of the Invention) According to the present invention, a high differential pressure can be maintained without being subjected to a strong surface pressure that causes quality deterioration, and in particular, a dry plating film is formed on a super-iron loss unidirectional silicon steel sheet. It is needless to say that not only is it suitable for occasional use, but it can also be applied to mild steel, etc., where strong local surface pressure tends to affect the quality of products.

[Brief description of drawings]

FIGS. 1 (a), (b) and (c) are schematic views showing the configuration of the differential pressure sealing device according to the present invention, and FIGS. 2 (a), (b) and 3 (a), (b) are FIGS. 4 (a) and 4 (b) are views showing another example of the differential pressure sealing device according to the present invention, and FIG. 5 is a schematic sectional view of a magnet roll. 1 …… Long ribbon 2 …… Guide roll 3 …… Ceiling attachment 3-1 …… Slider 3-2 …… Attachment body 4,5,6 …… Differential pressure chamber 7 …… Differential pressure chamber casing 8,9 …… Roll 10 …… Magnet 11 …… Lightweight member s ₁ …… Concave arc sealing surface s ₂ …… Second concave arc sealing surface t …… Slit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumihito Suzuki Inventor 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Division (72) Tsuneo Nagamine 1 Kawasaki-cho, Chiba-shi Kawasaki Steel Co., Ltd. Research headquarters

Claims (2)

[Claims] 1. A differential pressure seal for inducing continuous passage of a long ribbon while maintaining the pressure difference between the space regions having a pressure difference, wherein a long length is provided at a boundary between the space regions. A single magnetic material guide roll that guides the winding of the shaku ribbon and a part of one of the facing surfaces that is arranged so as to surround the circumference of the long ribbon and is on the guide roll. Is formed in a shape close to and along the thin ribbon surface of the guide roll, a part of the opposite side is close to the outer peripheral surface of the guide roll, and the tip is the outer peripheral surface of the guide roll. Is formed in a shape along the outer surface of the guide roll, and
A magnetic body seal roll is provided, the tip end portion of which is close to the outer surface of the guide roll and has a side surface structure in which the opposing portions are connected so as to keep them substantially airtight, and the seal attachment rotates in synchronization with the guide roll. 1. A differential pressure sealing device, characterized in that one or more of them are provided. 2. The differential pressure seal device according to claim 1, wherein a portion of the sealing attachment which is close to the thin strip surface on the guide roll slides vertically.