JP3146151B2 - Strip furnace sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing apparatus for a strip furnace.

[0002]

2. Description of the Related Art Conventionally, when a strip is continuously annealed, for example, the atmosphere in the furnace is prevented from being contaminated by the invasion of outside air into the furnace. In order to prevent the increase, a sealing device is disposed at the strip passage opening of the furnace inlet or extraction port. As this sealing device,
As proposed in Japanese Patent Application Laid-Open No. 2-18893, a roll seal mechanism is provided at a strip passage opening such as a furnace inlet, or as proposed in Japanese Patent Application Laid-Open No. 63-259059. In some cases, an N ₂ gas atmosphere chamber (enclosure chamber) is provided near an opening for strip passage such as an inlet.

[0003]

However, in the former roll seal mechanism, the strip is sandwiched between a pair of seal rolls coated with rubber or felt, while the strip is pressed against a seal plate attached to the furnace main body to load the furnace. However, the sealing roll surface wears out with the operation and a gap is formed between the sealing roll and the sealing plate, thereby deteriorating the sealing performance. Therefore, although a mechanism for correcting the gap by displacing the seal roll is additionally provided, there is a disadvantage that the configuration is very complicated.

Further, in the roll seal mechanism, since the strip is merely pressed by the seal roll, a gap is formed on the side of the strip or the like, and it is impossible to completely prevent the atmosphere from entering the furnace together with the strip.

On the other hand, in the latter case, the furnace external pressure <N
_{(2) The} pressure in the gas atmosphere chamber is set to be less than the furnace pressure, and N ₂ gas leaks out of the furnace to prevent entry of the atmosphere into the furnace and leakage of the atmosphere gas in the furnace to the atmosphere. However, there is a problem that consumption of N ₂ gas is large because it is one which leakage of N ₂ gas from the furnace.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sealing apparatus for a strip furnace, which combines the above-mentioned prior arts and can easily compensate for the wear by a cheap mechanism even if the seal roll or the like is worn. .

[0007]

According to the present invention, there is provided a sealing apparatus for a strip furnace according to the present invention, wherein a pair of sealing rolls are arranged in a strip passage opening of a furnace body so as to face each other. In a furnace sealing device, a seal block is provided between the seal roll and the furnace main body, the seal block being capable of moving back and forth with respect to a pass line, and having a thickness reduced in any of the moving directions. While attaching a felt to the furnace body sliding surface and seal roll pressing surface via an elastic body,
An N ₂ gas filling chamber is provided in the furnace body adjacent to the seal block, and the pressure in the N ₂ gas filling chamber is maintained lower than the furnace internal pressure and higher than the furnace external pressure.

[0008]

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 schematically shows a strip annealing furnace which is a bright annealing furnace equipped with the sealing device of the present invention. The strip furnace 1 includes a cooling zone A and a heating zone B.
And a strip passage opening 3 (a charging inlet 3) of the furnace main body 2.
a, the sealing device C according to the present invention is disposed at the extraction port 3b).

The sealing device C generally comprises a roll seal mechanism 5 and an N ₂ gas filling chamber 21. As shown in FIGS. 2 and 3, the roll seal mechanism 5 includes a side plate near the strip passage opening 3. A pair of drive motor-equipped seal rolls 7, 7 rotated by a pair of drive motors (not shown) supported by a bracket 6 attached to a bracket 4, and a pass line L between the seal roll 7 and the side plate 4 of the furnace body 2. And a pair of seal blocks 10 that can move forward and backward.

[0010] The seal roll 7 has a coating layer 8 of neoprene or silicon rubber, which is excellent in heat resistance and abrasion resistance and toughness, on its surface. Note that felt may be used depending on the material or temperature of the strip W.

As described above, the seal block 10 is provided between the furnace body 2 (side plate 4) and the seal roll 7, and includes a block body 11, a guide piece 15, and a pressing arm 16, While the guide piece 15 is loosely held on the guide rail 14 provided on the furnace main body 2 (side plate 4), the screw shaft 19 is rotated via the bevel gear mechanism 18 by rotating the handle 17 provided outside the furnace, The screw arm 20 provided on the pressing arm 16 can advance and retreat with respect to the pass line L.

The side surface of the block main body 11 on the side of the furnace main body 2 and the side of the seal roll 7 is slightly narrowed toward the pass line L, that is, has a wedge shape. An elastic body 12 such as sponge rubber is provided in a compressed state, and a felt 13 as a sealing material is mounted on the elastic body 12. Therefore, the side plate 4 of the felt 13 and the seal roll 7 are moved by rotating the handle 17 to move the seal block 10 forward and backward.
, Ie, the sealing force can be made variable.

In addition, both sides of the block main body 11 and the seal roll 7 come into contact with the side plate 9 attached to the side plate 4 as conventionally known, and a space S formed by the block main body 11 and the seal roll 7 is formed. The side opening is sealed.

As shown in FIG. 1, the N ₂ gas filling chamber 21 is formed by a resistance plate 22 provided near the strip passage opening 3 of the furnace main body 2 and the roll seal mechanism 5. The enclosure chamber 21 is always supplied with N ₂ gas by means not shown. Assuming that the furnace pressure is P ₂ , the indoor pressure of the N ₂ gas filling chamber 21 is P ₁ , and the atmospheric pressure is P, P ₂ is controlled to +25 to 70 mmH ₂ O in order to prevent intrusion of outside air, ₁ is controlled to be (P ₂ × 0.7) mmH ₂ O, that is, P <P ₁ <P ₂ .

With the above construction, the furnace pressure P ₂ and the N ₂ gas-filled chamber pressure P ₁ are respectively set as described above, and the handle 17 is rotated to move the seal block 10 forward and backward, whereby the side plate 4, the seal roll When operating the furnace by adjusting the contact pressure between 7, strip passage opening 3 by a roll seal mechanism 5 is almost sealed, moreover N ₂ for N ₂ gas pressure of the gas filled chamber 21 is greater than atmospheric pressure However, the outside air does not enter through any gap. The furnace extravasation of N ₂ gas (N ₂ gas consumption) is extremely small.

When the operation is performed for a long time, the coating material 8 of the seal roll 7 or the felt 14 of the seal block 11 is worn to deteriorate the sealing property. In this case, the handle 17 is operated to remove the seal block 10. It may be moved to the pass line L side to correct the pressure contact force (seal force) between the seal block 10, the side plate 4, and the seal roll 7 to a predetermined value.

The side surface of the block body 11 may be expanded inward, contrary to the above embodiment. In addition, since outside air (O ₂ ) does not adhere to the strip W and enter the furnace at the extraction port 3b, only one of the roll seal mechanism 5 and the N ₂ gas filling chamber 21 may be provided.

[0018]

As is apparent from the above description, according to the present invention, a roll seal mechanism provided with a pair of seal rolls at the strip passage opening of the furnace body, and a roll seal mechanism of the furnace body adjacent to the roll seal mechanism. Then, an N ₂ gas charging chamber is provided, and the pressure in the charging chamber is maintained lower than the furnace internal pressure and higher than the furnace external pressure. Therefore, since the N ₂ gas leaks out of the furnace from the roll seal mechanism, entry into the outside air furnace is almost prevented, and the atmosphere in the furnace is not polluted. Also,
Since the amount of leakage is controlled to be extremely small by the roll seal mechanism, the amount of consumed N ₂ gas is small and economical.
In addition, if the outer surface of the seal roll is worn and the sealing performance of the roll sealing mechanism is reduced, the sealing performance can be easily corrected by moving the seal block relative to the pass line, and the predetermined sealing performance can be maintained for a long period of time. This has the effect that it can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic view of a strip furnace provided with a sealing device of the present invention.

FIG. 2 is a front view of the sealing device of FIG. 1;

FIG. 3 is a sectional view taken along lines AA and BB of FIG. 2;

[Explanation of symbols]

2 Furnace main body 3 Strip passage opening 4 Side plate 5 Roll seal mechanism 7 Seal roll 10 Seal block 12 Elastic body 13 Felt 17 Handle 21 N ₂ gas filling chamber L Pass line W Strip

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takaaki Nishiyama 3rd Hikari, Kashima City, Ibaraki Prefecture Sumitomo Metal Industries, Ltd. Inside Kashima Works Ltd. (72) Inventor Eiichiro Uchiyama 3rd Hikari, Kashima City, Ibaraki Prefecture Sumitomo Metal Industries, Ltd. (56) References JP-A-8-67915 (JP, A) JP-A-8-49985 (JP, A) JP-A-3-253518 (JP, A) JP-A-7-268493 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C21D 1 / 00,1 / 74,9 / 56 F27D 7/06

Claims (1)

(57) [Claims] 1. A strip furnace sealing device in which a pair of seal rolls are disposed opposite to each other at a strip passage opening of a furnace main body, wherein the seal roll is capable of moving back and forth with respect to a pass line between the seal rolls and the furnace main body. And a seal block whose thickness is reduced in any of the forward and backward directions, and a felt is attached via an elastic body to a furnace body sliding surface and a seal roll press contact surface of the seal block, while the furnace body is A sealing apparatus for a strip furnace, characterized in that an N ₂ gas sealing chamber is provided adjacent to the seal block therein, and the pressure in the N ₂ gas sealing chamber is maintained lower than the furnace internal pressure and higher than the furnace external pressure. .