JPH01168863A - Differential-pressure sealing device for continuously treating strip - Google Patents

Abstract

PURPOSE:To effectively seal without deteriorating the product quality by forming a boundary between the spatial regions having a pressure difference, providing a seal box having the minimum gap at the wall surface abutting on the pass line of a strip, and arranging a roll couple in the seal box. CONSTITUTION:The boundary is formed between the spatial regions P1 and P2 having a pressure difference in the seal box 2, and the minimum gap 2E determined by the width and meandering margin of the strip 1 is provided to the side wall 2c abutting on the pass line of the strip 1. A couple of non- driven guide rolls 3 vertically sandwiching the pass line are incorporated along the guide groove provided in the seal box 2. The gap between the rolls 3 is adjusted by a spacer 4, the upper roll is fixed by an elasticity means 5 to obtain the desired pressing force of the roll couple 3 and to diminish the weight of the roll, and a desired lifting force is obtained. A guide rod 6 and a sealing member 7 are further provided.

Description

Detailed Description of the Invention (Industrial Application Field) While continuously feeding a strip such as a cold-rolled or hot-rolled steel strip (hereinafter simply referred to as a strip), vacuum deposition, ion blating, In lines where surface coating is applied using so-called dry brating methods such as sputtering, or lines where processes such as annealing and plating are applied, multiple
An air-to-air method is adopted in which the degree of vacuum is sequentially increased and then lowered between spatial regions with pressure differences before reaching those processing regions. This invention is
The present invention attempts to propose a differential pressure sealing device suitable for inducing continuous passage of the strip while maintaining such a pressure difference between spatial regions.

(Prior Art) For example, a first differential pressure chamber (pressure P,) and a second differential pressure chamber (pressure P,
), and set the desired differential pressure between them (Δp=P+
-Pg), it is important to have a structure that minimizes the gap in the side wall seal provided at the boundary of each differential pressure chamber. or N2, etc.) if the density is above a certain level,
In the so-called viscous flow region, the smaller the cross-sectional area of the gap, the more effective it is, and on the other hand, even in the so-called molecular region, where the gas density is relatively low, the smaller the cross-sectional area of the gap, the more effective the area where the gap is formed in the strip running direction. The longer the period, the greater the effect (see Figure 2).

Now, as a specific device for adapting a differential pressure seal with this type of mechanism to the air-to-air method, conventionally, a seal piece surrounding the strip is provided between the spatial regions where there is a pressure difference, and a seal roll is placed between the seal pieces. A method in which the strip is passed through the roll while being wound around the roll to maintain the differential pressure (
(see FIG. 3), or a method in which a pair of rolls are combined in place of the seal roll and the strip is passed between the rolls to maintain a differential pressure (see FIG. 4) is known.

(Problems to be Solved by the Invention) However, in the former of the conventional differential pressure sealing devices described above, the distance from the end face of the strip wound around the seal roll to the side wall of the seal casing is relatively large;
In addition, the gap between the roll end face and the casing side wall is very large even when allowance for thermal expansion is taken into account, and the structure makes it difficult to seal between them, so it is necessary to maintain a high differential pressure. In addition, the gap between the strip wound on the seal roll and the seal piece, especially near the exit side, may be affected by the seams of the strip (weld seams, steps due to differences in plate thickness, etc.) and the shape of the strip. There were problems in that the defect caused airflow turbulence, which caused the strip to vibrate, cause reflux, breakage, scratches, deterioration of product characteristics, noise, etc.

In addition, the above-mentioned type of differential pressure sealing device requires many sealing members such as contact type elastic materials (rubber, etc.) between the seal roll and the casing side wall, between the roll rotation axis and the casing, etc. Therefore, the resistance caused by the seal is large, and seal reels are often driven by motors, etc., which inevitably increases equipment costs due to strip tension control, etc. Furthermore, roll manufacturing, installation, etc. High precision was required for maintenance.

Next, the latter differential pressure sealing device is generally referred to as a pinch roll type, but this also has the same problem as the above device in that there is a large gap between the end face of the sealing roll and the casing side wall. , a gap adjustment mechanism between the seal rolls is required to accommodate the welded seams of the strips and strips with different thicknesses, and for this purpose, the seal piece must be made movable or the gap between the seal roll and the seal piece must be widened. Although it has the advantage of suppressing strip vibration, it requires a pump with a large capacity to maintain the desired differential pressure.

In addition, with this type, the force due to the pressure difference between the adjacent differential pressure chambers is applied to the seal roll, so the strip must be held with a large force that overcomes this force. Therefore, until a constant pressure difference is obtained, At the time of rising of the roll, an excessive pressing force is applied to the strip passing through the roll, which becomes the fourth cause of characteristic deterioration. Of course, mechanisms could be devised to prevent this, but the devices would become increasingly complex, and would have the disadvantage of lacking reliability and maintainability.

It is an object of the present invention to propose a differential pressure sealing device that is compatible with air-to-air processing of strips and is capable of achieving effective differential pressure sealing without degrading product quality.

(Means for Solving the Problems) The present invention provides a differential pressure seal that maintains the pressure difference between spatial regions having a pressure difference while inducing continuous passage of a strip. A seal box is provided on the wall surface that is in contact with the bus line of the strip and has a minimum gap determined by the width of the strip and the meandering distance, and the bus line of the strip is sandwiched between the upper and lower sides of the strip. This is a differential pressure sealing device for continuous processing of a strip-shaped article, in which a pair of guide rolls for guiding the material are disposed inside the seal box.

(Function) The differential pressure sealing device of the present invention is capable of separating a very small gap determined by the plate width of the strip and its meandering allowance at the boundary when the strip is fed between spatial regions having a pressure difference. Therefore, an effective differential pressure seal is achieved, and the strip can be passed between the upper and lower pair of guide rolls without being subjected to strong surface pressure, so there is no vibration or quality deterioration during strip passing. easily avoided.

(Example,) The present invention will be explained in detail below based on the drawings.

In Figure 1 (a), (b), (c) and (d),
1 shows a schematic diagram of a differential pressure sealing device according to the present invention. In the figure, number 1 is a strip, number 2 is a seal box consisting of an upper plate 2a, a lower plate 2b, and front, rear, left and right side wall plates 2c and 2d. , the minimum gap 2E (a
b).

Reference numeral 3 denotes a pair of non-driven guide rolls that sandwich the bus line of the strip 1 above and below and guide the strip 10, and this guide roll pair 3 includes roll chocks 3a and 3b.
It is rotatably attached to the seal box 2 via a bearing or the like and is incorporated along a guide groove 2F provided in the seal box 2. In addition, 4 is a spacer that adjusts the gap between the rolls,
5 fixes the upper roll and also fixes the guide roll pair 3
Elastic means is adjusted to provide a pressing force at point W or a desired pulling blade to reduce the roll's own weight, 6 is a guide rod, and 7 is a seal member.

In the differential pressure sealing device configured as described above, it is preferable that the plate 2c on the entrance side of the seal box 2 be formed into a curved surface in the vicinity of the minimum gap 2E in order to smoothly guide the airflow when the strip 1 is passed through the plate 2c. (Figure 1(a)
)reference). In addition, the inner protrusion required to maintain the desired differential pressure between the front and rear plates 2C 1=<1+
+Il□) is appropriately determined so as to have an optimal value.

The differential pressure sealing device of this invention does not need to transmit driving force to the pair of rolls 3, so a roll neck with a small diameter is sufficient, and if bearings are used, the resistance torque can be ignored and non-driving is possible. . In addition, in this invention, since the parts that require precision in configuring the device are straight lines and surface machining, installation is easy as long as attention is paid to the relationship between the gap 2E in the seal box 2 and the bus line of the strip 1. It is also very advantageous in terms of maintenance.

(Effects of the Invention) According to the present invention, 1) Since there is no need to install an extra sealing member between the end face of each roll of the roll pair and the side wall plate, the pump capacity required to obtain the desired degree of vacuum can be reduced. It is possible to reduce the time from several minutes to several tens of minutes, and since the roll pair can be made non-driving, there is no need for complicated controls such as tension control, and running costs and initial costs can be advantageously reduced. .

2) It is possible to prevent vibrations, scratches, property deterioration, noise, etc. of the strip during threading, and it is possible to achieve a high operating rate and obtain high-quality products with a high yield.

3) Manufacturing, installation, maintenance, etc. of each part constituting the differential pressure sealing device is easy, and the cost and manpower required for these can be significantly reduced.

[Brief explanation of the drawing]

1(a), (b), (c) and (d) are diagrams illustrating the configuration of a differential pressure sealing device according to the present invention; FIG. 2 is a diagram illustrating the procedure of a differential pressure seal; FIG. 3; FIG. 4 is a diagram showing the structure of a conventional differential pressure seal device. l...Strip 2...Seal box 3
... Roll pair 4 ... Spacer 5 ... Elastic means 6 ... Guide rod 7 ... Seal member Patent applicant Kawasaki Steel Co., Ltd.

Claims (1)

[Claims] 1. In a differential pressure seal that maintains the pressure difference between spatial regions having a pressure difference and guides continuous passage of a strip, a boundary is formed between the spatial regions. A seal box having a minimum clearance determined by the width of the strip and the meandering distance is provided on the wall surface corresponding to the bus line of the strip, and a pair of seal boxes are provided that sandwich the bus line of the strip above and below and control the guidance of the strip. A differential pressure sealing device for continuous processing of strips, comprising a guide roll disposed within the seal box.