JPS6324039A - Sealing device - Google Patents

Abstract

PURPOSE:To prevent the damage of a steel strip and to make sure sealing between furnaces by vertically moving a sealing body having a sealing material made of ceramic fibers in a sealing box provided to face a steel strip passage part between the furnaces so that said body can be brought into contact with the steel strip surface. CONSTITUTION:The sealing box part 4 which is opened in the lower part and is closed in the upper part is provided to face the steel strip passage part 2 in the upper part of an in-furnace roll 3 between the adjacent furnaces 1A and 1B of a continuous treatment furnace for the steel strip S. The sealing body 5 constituted by providing the sealing material 10 made of the ceramic fibers to the outside surface of a sealing material holder 7 is disposed to the inside of said box. The sealing body 5 is so provided that the sealing material 10 can be brought into contact with the surface of the steel strip S by vertically moving said body by a holding shaft 8. A sealing gas introduced from a sealing gas introducing port 6 into the sealing box part 4 is supplied through the spacing between the inside wall of the box part and the sealing body 5 into the steel strip passage part 2 and is branched toward the front and rear furnaces 1A, 1B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealing device between furnaces in a continuous processing furnace for steel strip.

[Conventional technology and one point in between] Conventionally, in continuous heat treatment furnaces for steel strips, sealing devices between adjacent furnaces were not particularly provided, and the furnaces were simply connected by a narrow throat section, or at most, sealing gas was installed in this throat section. Only sealing measures have been taken to purge the water.

This kind of sealing between furnaces is not a big problem when the atmospheric gas composition and temperature of adjacent furnaces are relatively similar, but in the case of continuous furnaces where it is necessary to avoid mixing of the surrounding air gas in the furnace. This is an extremely important issue. In particular, in the continuous heat treatment furnace process for steel strips using CVD (chemical vapor deposition), which the present inventor, Hirohiro, is currently investigating, sealing between the furnaces as described above becomes an extremely important problem. That is, in this process, the steel strip is continuously passed through a heating furnace, a CVD processing furnace, and a diffusion processing furnace.

By bringing an atmospheric gas containing (reactive gas) into contact with the steel strip, Si is evaporated onto the surface of the steel strip, and in the subsequent diffusion treatment furnace, the vapor-deposited Si is diffused into the steel strip by maintaining uniform heat. A high silicon steel strip is obtained. In such a continuous process, 5i
An atmosphere containing C44 is used, and in the adjacent heating furnace and diffusion treatment furnace, a non-oxidizing atmosphere that does not contain 5 lct is used. In this case, there is a problem that the st vapor deposition reaction occurs even in these processing furnaces, and the amount of vapor deposition becomes non-uniform. In addition, in the CVD process, FeC1z is generated by the reaction between Sic4 and the steel strip, and in the CVD processing furnace, this FeC1z is properly discharged outside as exhaust gas, but in a heating furnace or a diffusion treatment furnace, such discharge is not possible. As a result, there is a problem in that FeC1, which has coagulated into a solid phase, is deposited indoors, which has an adverse effect on the processing of the steel strip.

Conversely, when Hz gas is used as the atmosphere in a heating furnace or a diffusion treatment furnace, when H8 flows into the CVI) treatment f, it reacts with 5icl to generate HCl. This H.C.
1 is discharged from the system together with unreacted 5iCt and carrier gas such as Ar, but since it is necessary to recycle 5icz and carrier gas, it is necessary to separate and recover only HCl, and a recovery device for this purpose is required. is required. Also S
The reaction between i C1 and H generates 81 together with HC1, and there is also the problem that this Sl is deposited in the CVD processing furnace and has an adverse effect on the processing of the steel strip.

Conventionally, the seal structures used at the entrance and exit sides of continuous processing furnaces include, for example, a method in which the steel strip is sandwiched between seal rolls, and a method in which a seal plate is placed close to the steel plate. It is difficult to say that the sealing device is sufficient as a sealing device between furnaces as described above because the sealing performance is not sufficient and there are problems such as scratches on the steel plate.

In view of these conventional problems, it is an object of the present invention to provide a device capable of appropriately sealing between the furnaces of a continuous processing furnace.

[Means to solve the problem]

Therefore, in the present invention, a seal box part is provided facing the steel strip passage part between the furnaces, and a seal gas inlet is formed in the seal box part. A seal body having a sealing material is arranged to be movable up and down so as to form a gap with the inner wall of the seal box part, and the sealing material is capable of contacting the surface of the steel strip. Basic characteristics.

[For production]

The seal body in the seal box portion is brought into contact with the steel strip surface through which the seal material passes, and in this state, seal gas is introduced into the seal box portion at a pressure higher than the furnace pressure before and after it.

The seal gas passes through the gap between the seal box part and the seal material and is divided into the front and rear directions of the furnace.

The sealing material that comes into contact with the steel strip is made of a ceramic flybar that prevents scratches on the surface of the steel strip, and has the appropriate deformability to prevent warping of the steel strip. Able to respond appropriately to the situation.

〔Example〕

FIG. 1 shows one embodiment of the present invention, (IA) (
IB) is the adjacent furnace, (2) is this furnace (IA) (IB
) connecting the steel strip passage section (throat section'), (3) is an in-furnace roll placed facing this steel strip passage section (2).

A seal box part (4) having a seal gas inlet (6) is provided at the upper part of the furnace roll (3), facing the steel strip passage part (2).
4) has a structure in which the lower part opens to the yA steel strip passage part 2) and the upper part is closed.

There is a seal body (5) inside this seal box part (4).
is arranged so that it can be raised and lowered. This sealing body (5) is a box-shaped sealing material holder (7) with ceramic fiber sealing material aQ provided on the outer surface of the holding shaft (8).
) so that it can be raised and lowered.

The seal material αQ is a so-called ceramic fiber blanket made by compression molding ceramic fibers, and is attached to cover the outer surface of the seal box.

This sealing material a2 forms an appropriate gap with the inner wall of the seal box portion (4).

In this embodiment, the gap between the furnace roll (3) facing the seal box part (4) and the furnace wall is filled with a filler (9) made of ceramic fiber, and this gap is filled with a sealing gas inlet (31). ) is introduced to seal the bottom side of the steel strip.

(11) is the holding shaft (force and seal box part (4)
This is a shaft sealing device that seals between the

FIG. 2 shows another embodiment of the present invention, in which the device B) of the present invention is provided above and below the steel strip passage section (2). The specific configuration of each device is the same as that in FIG. 1, and the explanation thereof will be omitted.

FIG. 3 shows another embodiment in which, contrary to the structure shown in FIG.
The device (a) of the present invention is provided at the bottom of the device, and the specific structure of the device of the present invention is also the same as that shown in Figure 1.

In the apparatus of the present invention as described above, the sealing body (5) is pressed against the steel strip C8' through which the sheet is passed with a predetermined surface pressure, and the gas inside the sealing box part (4) is heated from the sealing gas inlet (6). Seal gas is supplied so that the pressure is higher than the pressure inside the furnaces (IA) (IB). This sealing gas passes through the gap between the sealing body (5) and the inner wall of the sealing box portion and flows toward the front and rear furnaces (LA) (IB).

In such a seal structure, the sealing material (ICj) in contact with the steel strip (S) is made of soft ceramic fiber, so it does not scratch the steel strip surface and has appropriate deformability. Therefore, it can appropriately respond to the shape condition of the steel strip such as distortion.

Regarding sealing performance, first, the sealing body (5) itself, which is pressed against the steel strip surface through the sealing material (11), mechanically shuts off the furnace (one person) (IB), thereby obtaining a sealing effect. In addition, the sealing gas pressure in the sealing box section (4) is always maintained higher than the pressure in the front and rear furnaces, and the sealing gas is branched from the sealing box section toward the front and rear of the furnace. ) can reliably prevent exchange of atmospheric gas between the two.

The apparatus (a) of the present invention as described above can be applied to all kinds of furnaces including continuous annealing furnaces for steel strips, but it is particularly applicable to steel strips that use extremely corrosive atmospheric gas in some of the furnaces. It can be said that this is an extremely suitable sealing device for continuous 8-strip equipment.

FIG. 4 shows a continuous silicon treatment facility for steel plates using CVD treatment (chemical vapor deposition treatment) to obtain high-silicon steel plates (for example, 6.5% Si steel plates).

This equipment is equipped with a heating furnace (A), a CVD treatment furnace (B), a diffusion treatment furnace (C), and a cooling furnace (D) in this order from the steel plate entry side.

In such equipment, the steel plate (S) is heated to a CVD treatment temperature in a non-oxidizing atmosphere in a heating furnace (A), and then guided to a CVD treatment furnace (B). This CVD processing furnace (B) contains 5 icts.

A reaction gas containing the above is supplied, and the reaction gas is sprayed onto the surface of the steel plate from a spray nozzle (L) to perform the 8-Si treatment.Then, the steel plate (S) is led to a diffusion treatment furnace (C), where it is The temperature is soaked and maintained at a predetermined temperature, and the SSL diffusion process is performed.

In other words, immediately after the CVD treatment, the Si concentration is high near the surface of the steel strip, and the Si concentration in the center remains the same as the base material.This is subjected to soaking and diffusion treatment to obtain a uniform Si concentration or a predetermined concentrated distribution. There is a need.

After such treatment, it is cooled to room temperature or an appropriate temperature by cooling g3CD), and then wound into a coil.

In such continuous processing equipment, as mentioned above, there is a gap between the CVD processing furnace (B) and the heating furnace (A) and between the CVDIA furnace (
It is necessary to ensure a seal between B) and the diffusion treatment furnace (C), so the apparatus of the present invention (B) is provided between these furnaces. It goes without saying that the device of the present invention may have any suitable structure including those shown in FIGS. 1 to 3.

In addition, in FIG. 4f, a sealing device a3 for preventing outside air from entering is provided on the entrance side of the heating furnace (A). Hereinafter, its structure will be explained based on FIG. 5.

In the figure, 04 is a steel strip inlet, 1 is a steel strip passage inside the steel strip inlet, and a seal chamber (16) is provided in front of the steel strip inlet 0.0. ing.

This seal chamber aQ has a seal gas inlet (17).
is provided.

Seal chamber (Seal roll Q is installed at the entrance of the LeO steel strip.
A contact type sealing mechanism consisting of a seal plate I and a seal plate I above the seal plate I is provided. The sealing plate α9 is a member that is softer than the steel strip in order to prevent scratches etc. from occurring on the steel strip.
For example, a steel strip made of wood or the like is pressed against a seal roll (1) to form a seal. Furthermore, a seal plate (19) is provided on the bottom side of the seal chamber aQ, and the light leakage from the seal plate (19) is provided on the bottom side of the seal chamber aQ. lS+ is in contact.

A seal box part (4) is provided at the upper part of the steel strip passage part (one facing the steel strip passage part). Since it is similar to that of the device of the present invention, the same reference numerals are given, and the explanation thereof will be omitted.The operation and effect of such a structure are also as explained in the device of the present invention.

At the lower part of the steel strip passage section, the seal box section (4) is installed.
A plate (c) is provided on the receiver so as to face the steel strip, and the steel strip is pressed against the plate by the sealing body (5).

In addition, in this seal device Q3, the seal box part (4
) does not necessarily need to be supplied with seal gas.

Apart from other sections, (A) is the seal gas inlet (L).
7) Supply piping for supplying gas to (6), Gel
is a differential pressure control valve provided in this supply pipe, (22a)
(22b) is a pressure gauge for detecting the pressure in the furnace and the seal chamber, the device is a throttle valve, and 00 is a differential pressure calculator.

Figure 6 shows another embodiment of the sealing device 03, in which the seal box part (4) and the plate (c) are connected to the steel strip passage part (3).
), and the other specific configuration is the same as that shown in FIG. 5, so a description thereof will be omitted.

Fig. 7 shows another embodiment in which seal box sections (4) are provided above and below the steel strip passage section (3), and the steel strip is sandwiched between the seal bodies (5). can be,
The specific configuration is also the same as that of FIG. 5.

Furthermore, Figs. 8 to 10 show other structural examples of the sealing device, in which a box-shaped sealing material holder with a large number of gas vents is provided in the sealing box portion (4'). (g), the end of the supply pipe for supplying gas into the sealing material holder trowel, and the air-permeable sealing material made of ceramic fiber attached to the outer surface of the sealing material holder (to) (
A seal body (5) consisting of (1) and (5) is arranged so as to be movable up and down.

The sealing material holder has a large number of gas holes on its front and rear surfaces, both side surfaces, and the surface on the steel strip passage side (the bottom surface in this embodiment).

The supply pipe (■) also serves as a shaft for lifting and lowering the seal body surface, and is connected to the sealing material holder @ by passing through the closing plate ω of the seal box portion, and is connected to the sealing material holder @, and is connected to the sealing material holder @ to supply the sealing gas into the holder. There is. In addition, this supply pipe frame can be slid up and down with respect to the seal box part (4), and the seal body (5) can move inside the seal box part (4) by holding this supply pipe (5). It is possible to go up and down.

Figures 9 and 10 show other embodiments having similar seal box parts, respectively. In Figure 9, the seal box part (4) and the receiver have a structure in which the plate (c) is upside down, and 1
Figure 0 shows a structure in which the receiver is not provided with a plate and has seal box sections on the top and bottom.

In the above-mentioned seal box part (4), the seal body (5) is pressed against the steel strip (S) through which the sheet is passed with a predetermined surface pressure, and the sealing material holder Ce is pressed from the supply pipe. A sealing gas (for example, Ar gas, etc.) is supplied to the inside. This sealing gas passes through the gas hole of the sealing material holder C→, further passes through the interior of the sealing material (support), and flows in the front-rear direction of the seal box portion (4').

As for sealing properties, first, the sealing body (which is pressed against the gA band surface through the sealing material) mechanically blocks the furnace and the sealing chamber, thereby providing a sealing effect.In addition, The sealing gas in the sealing material holder (c) also flows out from the gas vent 4 on the side facing the steel strip, but as shown in Fig. 11, the sealing gas flowing out from this part does not meet the steel strip. The inside of the sealing material (E) compressed between the two is divided into the heating furnace (A) and the sealing chamber αQ direction with the center of the sealing body as a boundary. Then, such a flow of sealing gas is formed inside the sealing company. This ensures that the rising air in the heating furnace (AI and seal chamber 4) flows in the direction of each other through the air-permeable seal material (support).

In this type of seal structure, great sealing performance can be obtained by dividing the seal gas in the front-rear direction inside the seal material on the side that contacts the steel strip, but what about the seal material in this part? Since the ring body (5') is compressed by the pressing force against the steel strip, the static pressure of the sealing gas is high in that part, so that appropriate sealing performance can be obtained with a small amount of sealing gas.

〔Effect of the invention〕

According to the present invention described above, sealing between furnaces in a steel strip pre-processing furnace can be reliably performed without causing damage to the steel strip.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention. Second
The figure is a longitudinal sectional view showing another embodiment of the present invention. The third figure is a longitudinal sectional view showing another embodiment of the present invention. FIG. 4 is an explanatory diagram showing a continuous 8-silicon treatment facility for steel plates to which the apparatus of the present invention is applied. FIGS. 5 through 1 are longitudinal cross-sectional views showing embodiments of the heating furnace entry side sealing device shown in FIG. 4, respectively. FIG. 11 is an explanatory diagram showing the flow of seal gas in the seal device shown in FIGS. 8 to 10. In the figure, (4) is the seal box part, (5) is the seal body, (6) is the seal gas inlet, (8) is the holding shaft, a
l indicates a sealing material. Patent applicant Nippon Kokan Co., Ltd. Inventor Michiaki Tsutsumi Representative patent attorney Sho Yoshihara Tamaya
Toshitodo Tomabechi, Bengurishi
Hiroko Yoshihara Figure 5 Figure 6 Figure 7 Figure $ 8 Figure 9 Figure 10 rA f11

Claims (1)

[Claims] In a sealing device between furnaces in a continuous steel strip processing furnace, a seal box portion is provided facing the steel strip passage portion between the furnaces, and a seal gas inlet is formed in the seal box portion. At the same time, a seal body having a sealing material made of ceramic fiber on its outer surface is arranged in the seal box part so as to be movable up and down so as to form a gap with the inner wall of the seal box part, and the sealing material contacts the steel strip surface. A sealing device characterized in that: