JP3136732B2 - Sealing apparatus and method for bright annealing furnace for steel strip - 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 device for preventing the atmosphere in a bright annealing furnace of a steel strip from leaking into the atmosphere.

[0002]

2. Description of the Related Art As a conventional sealing device for a bright annealing furnace for a steel strip, a sealing device having a structure shown in FIG. 6 is generally used. The sealing device includes a pair of holding rolls 23 (not rotating) that are located near the entrance of the bright annealing furnace 21 and above and below the pass line and sandwich the steel strip 22, and each holding roll 23 and a winding roll 24. And a felt band 26 wound around a rewind roll 25, and a pair of seal plates 27 provided at both ends of the pair of press rolls 23 in contact with the press rolls 23 (indicated by two-dot chain lines). It is composed of

[0003] A pair of holding rolls 23 is provided with a steel strip by rotating a screw 28 screwed into a female screw portion provided in a bearing box (not shown) at both ends thereof with a handle 29. 22 can be approached and separated. During the passage of the steel strip, the steel strip 22 is sandwiched between the pair of holding rolls 23, so that the felt strip 26 wound around the pair of holding rolls 23 comes into contact with the steel strip 22,
The atmosphere in the furnace does not leak from the upper and lower surfaces of the steel strip 22.

[0004] The felt band 26 is made of a bright annealing furnace 2.
Since it is also in contact with the first inlet portion 21a, the atmosphere in the furnace does not leak from this portion. Further, as described above, a pair of seal plates 27 provided on both ends of the pair of press rolls 23 in contact with the press roll 23 are provided.
Therefore, there is no leakage of the atmosphere in the furnace from both sides of the furnace. Since the felt band 26 gradually wears out as the steel band 22 passes, the winding roll 24 is sometimes turned by hand to slightly wind the felt band 26, and the pair of holding rolls 23 are formed. The contact position is changed.

[0005]

However, the above-mentioned conventional sealing device for a bright annealing furnace of a steel strip has the following problems. (1) Since the steel strip and the felt strip are always in contact,
The dust on the surface of the steel strip accumulates on the felt strip, and the deposited dust damages the steel strip. (2) The spinning of the felt band falls off, is carried into the furnace together with the steel strip, and burns to generate carbon, which adheres to the steel strip and causes a claim.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and provides a sealing device for a bright annealing furnace for a steel strip in which no damage is caused on the steel strip and no carbon is generated. It is intended to be.

[0007]

According to the present invention, there is provided a sealing device for a bright annealing furnace for a steel strip according to the present invention, wherein the atmosphere in the furnace is leaked into the atmosphere at the entrance side and the exit side of the bright annealing furnace for a steel strip. A pair of rotatable rubber rolls for sandwiching a passing steel strip from both sides, a pair of rotatable steel rolls in contact with each of the pair of rubber rolls, and one end of each of them. A pair of sliding plates whose sides are in contact with the pair of steel rolls , and the pair of sliding plates can be turned up and down.
A rotary support member and a support roller for supporting the function,
A pair of sliding plates are movably mounted on a brace provided on the other end.
Each having a counter weight attached thereto.
-One end of each of the sliding plates is made of steel
In such a manner as to make contact with the tool at a predetermined pressure .

Further, a bright annealing furnace for steel strip according to the present invention is provided.
The sealing method is a sealing device for a bright annealing furnace for steel strip according to claim 1.
2 sets are placed at regular intervals on the entrance or exit side of the bright annealing furnace for steel strip
The two sets of bright annealing furnaces for steel strip
The closed space formed by the _TwoIn a gas atmosphere
is there.

[0009]

In the sealing apparatus for a bright annealing furnace for steel strip according to the present invention, since the rubber roll is in contact with the steel strip, there is no need to strongly press the roll to seal, and dust on the steel strip is reduced by the roll. It does not adhere to and accumulate on the surface.

In the method for sealing a bright annealing furnace for a steel strip according to the present invention, two sets of sealing devices for a bright annealing furnace for a steel strip according to the present invention are provided on the entrance side or the exit side of the bright annealing furnace for a steel strip. The closed spaces formed by the sealing devices of the two sets of bright annealing furnaces for steel strips are separated from each other by a fixed distance, and the closed space formed by the sealing apparatus is slightly lower than the pressure of H ₂ gas used for bright annealing and higher than the atmospheric pressure. Since the N ₂ gas atmosphere is used, gas leakage of the bright annealing furnace can be effectively prevented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sealing apparatus for a bright annealing furnace for steel strip according to one embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a sealing device of a bright annealing furnace for a steel strip according to one embodiment of the present invention, and shows a state where the device is used on the entrance side of the bright annealing furnace. FIG. 2 is a view taken in the direction of arrows AA in FIG.

A seal device for a bright annealing furnace for steel strip according to one embodiment of the present invention comprises a pair of rotatable rubber rolls 1 for sandwiching a steel strip 22 passing through a bright annealing furnace 21 from both sides of an inlet and an outlet of the furnace. And a pair of rotatable rubber rolls 1 in contact with each of the pair of rubber rolls 1 over the entire length of the rolls.
It is composed of a pair of steel rolls 2 and a pair of sliding plates 3 in contact with each of the pair of steel rolls 2 over the entire body length. The body length of the pair of rubber rolls 1 and the pair of steel rolls 2 is the same as the width of the bright annealing furnace 21 and is supported by bearings 4 and 5 mounted outside the furnace, respectively.

Both rolls are rotating with both end surfaces of the roll body sliding on the wall. Sliding plate 3
Is provided with an arm 6, and a counterweight 7 is movably fitted into the arm 6. In this state, the sliding plate 3 is supported by a rotary support member 8 and a supporting roller 9 each having a knife-shaped tip. By adjusting the position of the counterweight 7 in the arm 6, the sliding plate 3 slides. Since the plate 3 can be inclined toward the steel roll 2 and always contact the steel roll 2 with an appropriate pressure, mechanical loss and wear can be minimized. Grease is sealed in a contact portion between the sliding plate 3 and the rotation support member 8 or the support roller 9 so as to achieve lubrication and also function as a gas seal.

FIG. 3 is a front view showing a contact state between the rubber roll 1 and the steel strip 22 in the sealing device. Since the roll is the rubber roll 1, the steel strip 22 is in a state of being wrapped in the rubber roll 1, and the sealing property is significantly improved.

FIG. 4 is an explanatory view showing a sealing structure between the wall surface 31 of the sealing device and both ends of the rubber roll 1 or the steel roll 2. The wall surface 31 is provided with a through hole 32 through which the journal portion 1a or 2a of the rubber roll 1 or the steel roll 2 penetrates, and the journal portion 1a or 2a
Are supported by bearings 4 or 5 mounted outside the furnace. At both ends of the body of the rubber roll 1 or the steel roll 2, a rotary sliding plate 11 pressed against the furnace wall 21 c by the spring 10 is provided. Since the furnace 11 rotates while being in contact with the furnace wall 21c, the atmosphere in the furnace does not leak from this part.

As shown in the side view of FIG. 5, a sealing device for a bright annealing furnace for a steel strip according to the present invention is provided on the entrance side or the exit side of the bright annealing furnace 21 at an interval in the passing direction of the steel strip. A set of seal roll chambers 12 is formed, and the pressure formed by the two sets of seal devices is slightly lower than the pressure of H ₂ gas used for bright annealing of steel strip and higher than the atmospheric pressure. N ₂ gas may be sealed. In this case, the N ₂ gas leaks in accordance with the pressure difference from the atmospheric pressure, but the amount of the expensive H ₂ gas leaking becomes very small, and the gas leak can be more strongly prevented.

[0017]

According to the present invention, the steel strip annealed in the bright annealing furnace does not have any flaws or adhere to carbon.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a sealing device for a bright annealing furnace for a steel strip according to one embodiment of the present invention is used on the entrance side of a vertical bright annealing furnace.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a front view showing a contact state between a rubber roll and a steel strip.

FIG. 4 is an explanatory view showing a seal structure between a furnace wall of a bright annealing furnace and both ends of a rubber roll or a steel roll.

FIG. 5 is an explanatory diagram showing an example in which a sill roll chamber is formed by two sets of sealing devices of a bright annealing furnace for steel strip according to one embodiment of the present invention.

FIG. 6 is an explanatory view of a conventional sealing device for a bright annealing furnace for steel strip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber roll 2 Steel roll 3 Bearing 4 Bearing 5 Sliding plate 6 Arm bar 7 Counter weight 7 8 Rotation support member 9 Support roller 9 10 Spring 11 Rotation sliding plate

Claims (2)

(57) [Claims] 1. A sealing device at the entrance side and the exit side of a bright annealing furnace for steel strip, which prevents the atmosphere in the furnace from leaking into the atmosphere, and is rotatable to sandwich a passing steel strip from both sides. 1 pair and a rubber roll of a steel roll respectively contact with and rotatable pair of rubber roll of the pair, such that each one
A pair of sliding plates whose end sides are in contact with each of the pair of steel rolls, and supporting the pair of sliding plates rotatably up and down.
Rotating support member and supporting roller, and the pair of sliding members
It is movably attached to the arm provided on the other end of the board
Each having a counter weight
Of one end of each of the sliding plates with respect to the steel roll
A sealing device for a bright annealing furnace for a steel strip, wherein the sealing device is configured to be brought into contact with a predetermined pressure . 2. Two sets of sealing devices for a bright annealing furnace for steel strips according to claim 1 are arranged at a fixed distance on an entrance side or an exit side of the bright annealing furnace for steel strips. A method for sealing a bright annealing furnace for steel strip, wherein a closed space formed by a furnace sealing device is set to an N ₂ gas atmosphere.