JP2010215990A - Dual-purpose facility for continuous annealing and hot-dip plating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dual-purpose facility for continuous annealing and hot-dip plating, which has a high flexibility of arrangement of a deflector roll and can easily eliminate a metal to be plated which has been deposited on the inner surface of a casing and a snout. <P>SOLUTION: The dual-purpose facility 10 for continuous annealing and hot-dip plating has a hot-dip plating pot 20 arranged at a subsequent stage of a continuous annealing furnace 11 through the snout 19. A front end face 13a of a first tubular casing 13 is connected to an outlet 11a of the continuous annealing furnace 11; and a second casing 14 of which the rear end part 14b is sealed is rotatably connected to the rear end face 13b of the first casing 13 through a shaft support part 15. A turndown roll 23 is arranged at a rear end side of the first casing 13; an inlet 19a of the snout 19 extending obliquely downward is connected to the lower part of the rear end part 14b of the second casing 14; and a sealing device 12 is installed between the outlet 11a of the continuous annealing furnace 11 and the turndown roll 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a facility for combined continuous annealing and hot dipping that can operate by switching between continuous annealing and hot dipping of a steel strip, in which a hot dipping pot is disposed via a snout at the subsequent stage of the continuous annealing furnace.

Conventionally, facilities for continuous annealing and hot dipping that can be operated by switching between continuous annealing and hot dipping of steel strip have been put to practical use. For example, in Patent Document 1, a snout is connected to a furnace outlet hood (casing) mounted at the outlet of a continuous annealing furnace via an expansion tube (bellows), and is disposed at the subsequent stage of the continuous annealing furnace with a hot-dip plating pot interposed therebetween. An invention of a hot dipping line and a continuous annealing furnace line characterized in that the snout can be tilted toward the deflector roll is disclosed. When performing hot dipping in the present invention, the snout is tilted downward, the steel strip coming out of the snout is immersed in the hot dipping pot, and the transport direction of the steel strip is changed by a sink roll disposed in the hot dipping pot. Then, the steel strip is pulled up from the hot dipped pot. On the other hand, when performing continuous annealing, by tilting the snout upward, the steel strip coming out of the snout jumps over the hot dipped pot and is conveyed toward the deflector roll, and the direction is changed by the deflector roll.

JP 2000-265217 A

In the case of the combined hot-dip plating line and continuous annealing furnace described in Patent Document 1, since the snout is connected to the outlet of the continuous annealing furnace via a bellows, the tilt angle of the snout is small, and the deflector roll is installed. The position is limited to the periphery of the hot dipped pot. Therefore, there is a problem that the deflector roll gets in the way and the maintenance work around the hot dipped pot is hindered. Further, in the case of the conventional combined line, there is also a problem that it is not easy to remove the plating metal adhering to the inner surface of the casing or snout during the hot dipping. Although it is possible to provide a maintenance hatch for the removal work on the casing, there is a problem that the removed plating metal falls into the hot dipped pot via the snout.

The present invention has been made in view of such circumstances, and provides a facility for continuous annealing and hot dipping that has a high degree of freedom in arrangement of deflector rolls and can easily remove metal for plating attached to the inner surfaces of the casing and snout. For the purpose.

In order to achieve the above object, the present invention provides a continuous annealing and melting process in which a hot dipping pot is disposed through a snout at the latter stage of a continuous annealing furnace, and can be operated by switching between continuous annealing and hot dipping of a steel strip. In the plating combined facility, a cylindrical first casing having a front end face connected to an outlet of the continuous annealing furnace and having a turn-down roll on the rear end side, and the front end face abuts on the rear end face of the first casing. A cylindrical second casing whose upper end is sealed, a snout whose front end is joined to a lower portion of the rear end of the second casing, an outlet of the continuous annealing furnace, and the turn Sealing means arranged between the down roll, the second casing is pivotally supported by the first casing, and the second casing is rotatable with the snout in a vertical plane. That It is a symptom.
In the present specification, the conveying direction of the steel strip is referred to as “rear” direction, and the opposite direction is referred to as “front” direction.

The present invention provides a cylindrical casing installed between an outlet of a continuous annealing furnace and a snout, a first casing connected to the outlet of the continuous annealing furnace, and a second casing to which the snout is joined. The front end portion of the second casing is pivotally supported by the rear end portion of the first casing and rotates together with the snout. Thereby, the snout can be largely rotated (tilted) in the vertical plane together with the second casing. At that time, since the sealing means is disposed between the outlet of the continuous annealing furnace and the turndown roll, when the second casing rotates, the reducing atmosphere gas in the continuous annealing furnace leaks to the outside. And no air enters the continuous annealing furnace.

Moreover, in the continuous annealing and hot dipping facility according to the present invention, it is preferable that a sealing material is interposed between the rear end surface of the first casing and the front end surface of the second casing. With this configuration, the airtightness of the contact portion between the first casing and the second casing can be enhanced.

In the continuous annealing and hot dip plating facility according to the present invention, a cylindrical casing installed between the outlet of the continuous annealing furnace and the snout, the first casing connected to the outlet of the continuous annealing furnace, and the snout are Since the second casing is pivotally supported by the first casing and is rotated, the snout is largely rotated in the vertical plane together with the second casing. be able to. Thereby, the arrangement | positioning freedom degree of a deflector roll becomes high and a deflector roll can be installed in the location which does not interfere with the maintenance work around a hot dipping pot.
In addition, by tilting the snout until it is almost horizontal, it is easy to remove the plating metal adhering to the casing and the inner surface of the snout by utilizing the gap formed between the first casing and the second casing. It can be carried out.

It is a schematic diagram of the continuous annealing and hot dipping combined equipment which concerns on one embodiment of this invention at the time of the hot dipping of a steel strip. It is a schematic diagram of the same continuous annealing and hot dipping equipment at the time of continuous annealing of a steel strip.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. As described above, in the following description, the conveying direction of the steel strip is referred to as a “rear” direction, and the opposite direction is referred to as a “front” direction.

1 and 2 show a schematic configuration of the continuous annealing and hot-dipping facility 10 according to an embodiment of the present invention.
In the continuous annealing and hot dip plating equipment 10, a hot dip plating pot 20 is disposed through a cylindrical snout 19 at the rear stage of the continuous annealing furnace 11 for performing heat treatment such as heating, soaking, and cooling on the steel strip S. ing. A front end face 13 a of the cylindrical first casing 13 is connected to the outlet 11 a of the continuous annealing furnace 11. On the rear end surface 13b of the first casing 13, a cylindrical second casing 14 having the same cross section as the first casing 13 and having the upper end of the rear end portion 14b sealed is provided via a shaft support portion 15. It is connected. Further, a turn-down roll 23 is disposed on the rear end side in the first casing 13, and an inlet 19 a (front end portion) of a snout 19 extending obliquely downward is provided below the rear end portion 14 b of the second casing 14. Are joined. An intermediate portion of the snout 19 is suspended from above by a wire rope 24, and the tilt angle of the snout 19 can be changed by winding the wire rope 24 with a winch (not shown) or the like.

The outer peripheries of the rear end surface 13b of the first casing 13 and the front end surface 14a of the second casing 14 are reinforced by flanges 16 and 17, respectively, and the upper ends of the flange 16 and the flange 17 are rotated in a vertical plane. It is connected via a shaft support 15 having a moving shaft so as to be rotatable. A gasket 18 (sealing material) is attached to the surface of the flange 16 that contacts the flange 17.

Between the outlet 11a of the continuous annealing furnace 11 and the turn-down roll 23, a sealing device 12 (seal means) is provided to prevent leakage of the reducing atmosphere gas in the continuous annealing furnace 11, and to perform the continuous annealing furnace 11. Prevent air from entering the interior. The sealing device 12 may use a labyrinth seal in which a plurality of labyrinth seal plates are provided at intervals in parallel to the width direction of the steel strip S, or a partition plate or a roll is provided above and below the steel strip S. Also good.

As shown in FIG. 1, a sink roll 22 for changing the conveying direction of the steel strip S is installed in the hot dipping pot 20. Further, as shown in FIG. 2, a deflector roll 25 for changing the conveying direction of the steel strip S is installed on the deck 26 installed behind the continuous annealing furnace 11 with the molten plating pot 20 interposed therebetween. .

When performing hot dipping with the continuous annealing and hot dipping combined equipment 10, as shown in FIG. 1, the rear end face 13b of the first casing 13 and the front end face 14a of the second casing 14 are brought into contact with the casing 13, 14 is sealed, and the outlet 19 b of the snout 19 is immersed in the molten metal 21 in the molten plating pot 20.

The steel strip S discharged from the continuous annealing furnace 11 passes through the turn-down roll 23 in the first casing 13, then passes through the snout 19 joined to the second casing 14, and enters the hot-dip plating pot 20. It is immersed in the molten metal 21. During this time, the steel strip S is cut off from the atmosphere by the casings 13 and 14 and the snout 19.
The steel strip S to which the molten metal 21 is adhered is changed in direction by the sink roll 22 in the hot dipped pot 20 and then pulled up from the hot dipped pot 20 and conveyed to the subsequent equipment.

On the other hand, when continuous annealing and continuous annealing are performed by the hot dipping plating equipment 10, as shown in FIG. 2, the wire rope 24 is wound up to a position where the snout 19 is slightly obliquely below the horizontal using a winch or the like. The outlet 19b is directed to the deflector roll 25.

After passing through the turn-down roll 23 in the first casing 13, the steel strip S discharged from the continuous annealing furnace 11 passes through the snout 19 joined to the second casing 14 and goes to the deflector roll 25. The direction of the steel strip S is changed by the deflector roll 25 and is transported to the subsequent equipment.
In addition, since the sealing device 12 is installed between the outlet 11a of the continuous annealing furnace 11 and the turn-down roll 23, when the snout 19 rotates together with the second casing 14, the reducing property in the continuous annealing furnace 11 is reached. The atmospheric gas does not leak to the outside, and the atmosphere does not enter the continuous annealing furnace 11.

When removing the plating metal adhering to the inner surfaces of the casings 13, 14 and the snout 19, as shown in FIG. 2, the wire is used until the snout 19 is positioned slightly obliquely below the horizontal using a winch or the like. In the state where the rope 24 is pulled up, using the gap formed between the first casing 13 and the second casing 14, the plating metal adhering to the inner surfaces of the casings 13, 14 and the snout 19 is removed. Good.

Although one embodiment of the present invention has been described above, the present invention is not limited to the configuration described in the above-described embodiment, and is within the scope of matters described in the claims. Other possible embodiments and modifications are also included. For example, in the above-described embodiment, the snout is an integrated object, but an expansion / contraction tube such as a bellows may be provided in the middle so that the expansion / contraction is possible.

10: Combined equipment for continuous annealing and hot dipping, 11: Continuous annealing furnace, 11a: Outlet, 12: Sealing device (sealing means), 13: First casing, 14: Second casing, 13a, 14a: Front end face 13b: rear end surface, 14b: rear end portion, 15: shaft support portion, 16, 17: flange, 18: gasket (seal material), 19: snout, 19a: inlet (front end portion), 19b: outlet, 20: hot dip plating Pot, 21: Molten metal, 22: Sink roll, 23: Turn-down roll, 24: Wire rope, 25: Deflector roll, 26: Deck, S: Steel strip

Claims (2)

In the continuous annealing and hot dipping combined equipment that can be operated by switching between continuous annealing and hot dipping of the steel strip, a hot dipping pot is arranged through the snout after the continuous annealing furnace,
A front end face is connected to the outlet of the continuous annealing furnace, a cylindrical first casing having a turn-down roll on the rear end side, and the front end face abuts the rear end face of the first casing, Between the cylindrical second casing with the upper part sealed, the snout with the front end joined to the lower part of the rear end of the second casing, and the outlet of the continuous annealing furnace and the turndown roll And a sealing means arranged in
The continuous annealing and hot dip plating facility characterized in that the second casing is pivotally supported by the first casing, and the second casing is rotatable in a vertical plane together with the snout. 2. The continuous annealing and hot-dip plating facility according to claim 1, wherein a sealing material is interposed between the rear end surface of the first casing and the front end surface of the second casing. And hot dipping plating equipment.

Images