JPH10158749A - Bright annealing furnace and its operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bright annealing method which expels red hot heated brick scrap, etc., toward the side to prevent the same from arriving at a sealing roll even if the brick scrap, etc., fall from above. SOLUTION: This bright annealing furnace arranged with a heating chamber lined with the bricks on its inside surface below a cooling chamber and a sealing chamber 30 below this chamber is provided with a lower sealing chamber 38 below an upper sealing chamber 31 by deviating the lower sealing chamber 38 from the central line of the heating chamber 30. The upper sealing chamber 31 is internally provided with a first pass line roll 32 for shifting in contact with the left side of a strip 3 in alignment to the central line of the lower sealing chamber 38. A second pass line roll 33 for shifting is disposed above the first pass line roll 32 in contact with the right side of the strip 3 in alignment to the central line of the heating chamber 30. A third pass line roll 34 is disposed slightly below the second pass line roll 33. The second and third pass line rolls 33, 34 are made transversely movable. Then, even if the brick scrap, etc., fall, the brick scrap, etc., are removed toward the side in the upper sealing chamber 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical bright annealing furnace for bright annealing stainless steel strip and a method of operating the same.

[0002]

2. Description of the Related Art Conventionally, in a vertical bright annealing furnace for bright annealing stainless steel strip, a cooling chamber for rapidly cooling the strip is arranged above a heating chamber for heating the strip. An up-heat type bright annealing furnace that performs bright annealing by sending the material from below to above and a down-heat type bright annealing furnace that arranges a cooling chamber below the heating chamber and sends the strip downward from above to perform bright annealing. is there.

An upheat type bright annealing furnace 100 is shown in FIG.
As shown in (1), a heating chamber 120 is provided below the cooling chamber 110, and a seal chamber 130 is provided below the heating chamber 120. The cooling chamber 110 has openings above and below that allow the strip 103 to pass through, and a well-known rapid cooling means is provided inside the cooling chamber 110. In addition, heating room 1
20 is provided with an opening through which the strip 103 can pass above and below, the outer surface of the heating chamber 120 is surrounded by an iron plate 121, bricks 122 are stacked on the inner surface of the iron plate 121, and a plurality of heaters 123 are arranged inside the brick 122. And
A brick-type heating chamber 120 capable of heating the strip 103 is configured.

An atmosphere of hydrogen is blown into the heating chamber 120 to maintain the atmosphere in the furnace. Further, a sealing chamber 130 is provided below the heating chamber 120 so that outside air does not enter the heating chamber 120. The seal chamber 130 includes an upper seal chamber 131 and a lower seal chamber 138. The seal chamber 130 includes a pair of seal rolls 139 at an opening 138a at a lower portion of the lower seal chamber 138 so as to be sandwiched in the upper seal chamber from both sides of the strip. A pair of pass line rolls is provided. In addition, an inert gas such as hydrogen is blown into the sealing chamber to keep the air from entering the heating chamber.

[0005] When such a heating chamber 120 is used, the brick 122 in the furnace is red-heated, and the peeled brick dust 125 falls, and continues to roll between the pass line roll 134 and the strip, and the rubber pass. The line roll 134 is melted, the surface of the roll is deformed, or the roll is damaged. In addition, pass line roll 134 and strip 1
03, and the strip 103 may be scratched.

Further, if brick dust or the like reaches the seal roll 139 disposed at the lower opening, the same adverse effect as described above occurs, and the sealability is further lost. Even in the case of the down heat, there is a case where dust is caught in the seal roll and scratches the strip.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a bright annealing furnace in which even if red-hot brick debris or the like falls from above, it is removed to the side and does not reach the seal roll.

[0008]

Means for Solving the Problems, Embodiments of the Invention, and Effects of the Invention The present invention provides a heating room having a brick-covered inner surface,
A cooling chamber, and a seal chamber disposed below a vertical heat treatment furnace having a heat treatment furnace, wherein the strip is conveyed upward or downward inside the heat treatment furnace while brightly annealing the strip. The seal roll comprises an upper seal chamber and a lower seal chamber, and the lower seal chamber is provided laterally offset from the center line of the heating chamber, and a seal roll for shielding outside air from an opening at a lower portion of the lower seal chamber. Inside the upper seal chamber, the upper and lower pass line rolls, which are in contact with the left and right surfaces of the strip, respectively, and are arranged at a predetermined distance in the height direction, hold the strip in the upper seal chamber. A bright annealing furnace characterized in that the center line of the heating chamber and the center line of the lower seal chamber are guided while being shifted so as to be connected to each other.

According to the present invention, the strip is shifted from the center line of the heating chamber to the position of the center line of the lower seal chamber by the upper pass line roll and the lower pass line roll. Falling brick debris is dropped behind the lower pass line roll and removed to the side.

A third pass line roll is provided at an intermediate height between the upper and lower pass line rolls on the same side as the upper pass line roll with respect to the strip.
And the upper pass line roll may be movable in the lateral direction.

In this case, the strip between the upper pass line roll and the lower pass line roll is inclined from the center toward the side provided with the second pass line roll from top to bottom. Therefore, by moving the upper and third pass line rolls, brick debris falling on the upper pass line roll side can be removed to the side.

Further, in the bright annealing furnace according to claim 2, brick debris or the like is placed above the upper pass line roll, or brick debris or the like is caught between the strip and the upper pass line roll. In some cases, the third pass line roll is advanced to abut the strip, and then the upper pass line roll is retracted away from the strip, and then the upper pass line roll is advanced to abut the strip. After the contact, the third pass-in roll is retracted and separated from the strip, and it is preferable to adopt a method of operating a bright annealing furnace.

In this way, it is possible to remove brick debris placed on the upper palline roll and brick debris caught between the strip and the upper pass line roll without changing the shift state of the strip. . In this way, debris such as brick debris falling on both sides of the strip is removed to the side in the upper seal chamber, and the debris such as brick debris does not fall to the seal roll. I will not let you.

If the upper pass line roll is damaged, the operation can be continued by using a third pass line roll instead of the upper pass line roll.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The embodiment is an up-heat type bright annealing furnace for bright annealing a stainless steel strip. As shown in FIG. 1, a heating chamber 20 is disposed below a cooling chamber 10 and a heating chamber 2
The seal chamber 30 is disposed below the seal chamber 30.

The cooling chamber 10 has strips 3 at the top and bottom.
The cooling chamber 10 is provided with a well-known cooling means for cooling the strip 3 in the cooling chamber 10.
The heating chamber 20 has openings at the upper and lower portions through which the strip 3 can pass, covers the outer periphery with an iron plate 21, attaches a brick 22 to the inner surface of the iron plate 21, and includes a plurality of heaters 23 inside the brick 22. .

The seal chamber 30 is covered with an iron plate.
As shown in FIG. 2, a lower seal chamber 38 is disposed below the upper seal chamber 31 so as to be shifted laterally to the right from the center of the heating chamber 30, and a pair of seal rolls 39 is provided in the lower opening 38a. Is provided. The upper seal chamber 31 has an upper portion connected to the heating chamber 30, and a guide first rubber-made pass line roll 32 for shifting the strip 3 by touching the left side thereof is provided inside the upper seal chamber 31. The first pass line roll 32 is rotatably provided with the roll surface 32a aligned with the center line of the lower seal chamber 38.

A second pass line roll 33 for guiding the shift is provided above the first pass line roll 32 at a position indicated by a solid line, and the roll surface 31a is aligned with the center line of the heating chamber 30 and stripped. 3 is rotatably provided so as to touch the right side. Second pass line roll 3
A third third pass line roll 34 is provided slightly below the strip 3 at a position shown by a solid line and is separated from the strip 3.

Here, the second pass line roll 33 and the third pass line roll 34 can be moved laterally by a well-known cylinder (not shown) in the direction of the arrow to the position shown by the dotted line. A sealing plate 3 having a divergent inclination upward and downward above the second pass line roll 33.
5, 35 are provided on both sides. The seal plates 35, 35
When the furnace is stopped above the rotary shaft 3 as shown by a dotted line, rubber seals 36, 36 for urgent sealing are used.
6a and 36a so that they can be opened and closed. The seals 36, 36 are kept open during normal operation as shown by the solid line.

The first brick dust protectors 37a, 37a are provided on both sides of the seals 36, 36 so that the first brick dust protectors 37a, 37a are inclined downward and divergent downward like the seal plate 35.
Also, between the lower seal chamber and the first pass line roll 32, second brick dust protectors 37b and 37c are provided on both sides with a downward sloping inclination.

Referring back to FIG. 1, reference numeral 40 denotes a top roll chamber, and reference numeral 50 denotes a delivery chute. With this configuration, as shown in FIG. 2, even if the brick waste 25 is peeled off during bright annealing of the stainless steel strip and falls into the sealing chamber 30 from above, the first brick protector 3 can be used.
The first removal is performed at 7a. Also, when the brick waste 25 that has passed down through the first brick protector 37a and falls down from the left side of the strip 3, the first pass line roll 32 is moved to the right side so that the first pass It rolls down from the left side of the run roll 32 onto the second brick protector 37b and is removed to the side. In addition, when falling from the right side of the strip 3, it may be rolled on the second pass line roll 33 on the second pass line roll 33 or bitten between the strip 3 and the second pass line roll 33. In such a case, the third pass line roll 34 is advanced to the position indicated by the dotted line, the second pass run roll 33 is retracted to the position indicated by the dotted line, the brick waste 25 is dropped down, and again. Second pass line roll 33
Is advanced to the position indicated by the solid line and returned, and the third pass line roll 34 is retracted and returned to the original position indicated by the solid line.

Therefore, the strip 3 between the second pass line roll 33 and the first pass line roll 32 is inclined from the center toward the second pass line roll 33 from top to bottom. Therefore, by this inclination,
By moving the second pass line roll, the brick waste 25 falling to the right is dropped on the second brick protector 37c and removed to the side.

In this manner, the brick scraps 25 falling from the heating chamber 30 can be individually removed, so that the seal roll 39 is not damaged. If the second pass line roll 33 is damaged, the operation can be continued by using the spare third pass line roll 34.

Although the embodiment of the present invention has been described above, various embodiments can be made without departing from the scope of the present invention. For example, in addition to the up-heating type, in a bright annealing furnace of the down-heating type having a cooling chamber 70 below the heating chamber 60 as shown in FIG. Is provided, dust and the like falling from above can be removed to the side as in the embodiment.

In the embodiment, the lower seal chamber 38 is shifted rightward from the center line of the heating chamber 30, but the lower seal chamber 38 may be shifted leftward. In this case, the first pass line roll 32, the second pass line roll 33, and the third pass line roll 34 for guiding for shifting may be arranged at positions opposite to those in the embodiment. In such a case, the same operation and effect as the embodiment can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a bright annealing furnace according to an embodiment.

FIG. 2 is a cross-sectional view illustrating a main part of the seal chamber.

FIG. 3 is a cross-sectional view illustrating a main part of a bright annealing furnace according to another embodiment.

FIG. 4 is a cross-sectional view illustrating a main part of a bright annealing furnace according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bright annealing furnace, 3 ... Strip, 10, 70 ... Cooling chamber, 20, 60 ... Heating chamber, 30, 80 ... Seal chamber, 31
... upper seal chamber, 32 ... first pass line roll, 33
... Second pass line roll,... Third pass line roll,..., Lower seal chamber, 38a.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Tawara 2-901 Inokoishi, Meito-ku, Nagoya City, Aichi Prefecture

Claims (3)

[Claims] 1. A sealing chamber is arranged below a vertical heat treatment furnace having a heating chamber and a cooling chamber, each of which is bricked on an inner surface, and a strip is conveyed upward or downward inside the heat treatment furnace. In the bright annealing furnace for bright annealing the strip, the seal chamber includes an upper seal chamber and a lower seal chamber, and the lower seal chamber is provided to be shifted from a center line of the heating chamber, and the lower seal chamber is provided. A seal roll for shielding outside air is provided at the lower opening of the strip, inside the upper seal chamber, abut on both left and right surfaces of the strip, and are disposed at a predetermined distance in the height direction,
A lower pass line roll is provided, and the strip is guided while being shifted by the upper and lower pass line rolls in the upper seal chamber so as to connect the center line of the heating chamber and the center line of the lower seal chamber. A bright annealing furnace, characterized in that: 2. A third pass line roll is provided at an intermediate height between the upper and lower pass line rolls on the same side as the upper pass line roll with respect to the strip. In addition to being provided so that it can move in the horizontal direction,
The bright annealing furnace according to claim 1, wherein the upper pass line roll is also movable in the lateral direction. 3. The bright annealing furnace according to claim 2, wherein brick debris or the like is placed above the upper pass line roll, or brick debris or the like is caught between the strip and the upper pass line roll. In some cases, the third pass line roll is advanced to abut the strip, and then the upper pass line roll is retracted away from the strip, and then the upper pass line roll is advanced to abut the strip. The method of operating a bright annealing furnace, wherein the third pass-in roll is retracted and separated from the strip after contact.