JPH0810819A - Method and device for changing carrying course of steel strip in production line used to hot-dipping steel plate and also, cold drawn steel plate - Google Patents

Abstract

PURPOSE:To change a carrying course in a short time and to improve the production efficiency by changing the carrying course of a steel strip to either one of a sink roll arranged in a plating bath or a deflector roll just above a plating bath pot according to the kind of passing steel strip. CONSTITUTION:The plating bath pot 1 is descended and also, the tip part of a snout 8 (slider 8b) is retreated, and on the other hand, the revolutional drive of the deflector roll 3 is started. The position of the deflector roll 3 is coincident with t-t course below the sink roll 4a by simultaneously executing the traverse motion of a carrier 5a, the descent of an elevating frame, the swing of the sink roll 4a and further, the tilting of the snout 7 so as to hold the t-t course of the sink roll 4a to the vertical direction. Then, a shaking link 4 holding the sink roll 4a is further swung to withdraw the sink roll from the pass-line of the steel strip S. The elevating frame 5b is ascended until the position of the deflector roll 3 becomes the original position which the sink roll 4a exists.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel strip conveying route change capable of producing a hot-dip plated steel sheet and a cold-rolled steel sheet in a single line without stopping the production line or having a complicated apparatus structure. The present invention relates to a method and an apparatus thereof.

[0002]

2. Description of the Related Art In recent years, in the production line for hot-dip galvanized steel sheets, cold-rolled steel sheets have also been produced on the same line from the viewpoint of the dual use of the lines. In order to change the transport route of, the sink rolls that are immersed in the plating bath are generally pulled up onto the bath and the steel strip is passed through the plate. Reference is made to JP-A-2-34762.

By the way, such a conventional transfer path changing method has the following problems and leaves some room for improvement.

That is, since the molten plating metal adheres to the sink roll around which the steel strip is wound in the plating bath, when it is pulled up onto the bath, it is exposed to air to cool and solidify. Then, they adhered to each other on the surface of the roll, which caused pressing scratches and abrasions during the transportation of the steel strip. Similarly, at the bearing of the sink roll, the plated metal is also fixed, so that the roll does not rotate smoothly and slips between the steel strip and the surface of the steel strip, causing scratches on the surface of the steel strip. It was a cause of scratches.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to propose a method and an apparatus which can easily change the conveying path of a steel strip without causing the above-mentioned problems.

[0006]

[Means for Solving the Problems] When manufacturing a hot-dip galvanized steel sheet and a cold-rolled steel sheet in a single line, a steel strip transport path is provided in a plating bath pot depending on the type of the strip steel strip. A hot dip plated steel sheet, characterized in that the sink roll arranged or the deflector roll arranged immediately above the plating bath pot is switched to be used to pass through the plating bath pot or bypass the plating bath pot. A method for changing the conveying path of a steel strip in a cold-rolled steel sheet combined production line.

Further, according to the present invention, a main body frame is provided directly above the plating bath pot, and a deflector roll around which a steel strip is wound around the main body frame, and the rotary shaft of the deflector roll is oscillated as a fulcrum, and its tip end is swung. Is provided with a swinging link having a sink roll around which a steel strip is wound in a plating bath pot, and the deflector roll is provided with a moving mechanism capable of moving vertically and horizontally together with the swinging link. A steel strip transport path changing device, wherein the moving mechanism holds a deflector roll together with a swing link and moves the deflector roll left and right on a main body frame, and moves the deflector roll and the swing link up and down on the cart. It is particularly preferable to use a lifting frame, and at least one of the plating bath pot and the body frame is It is preferable to arrange the movable lifting mechanism in the direction to close or away from the these with each other.

Further, according to the present invention, a deflector roll suspended and supported oscillatably via a first link is provided directly above the plating bath pot, and the deflector roll oscillates about the rotation axis of the roll. It is possible and has a second link provided with a sink roll around which a steel strip is wound in the plating bath pot, or a deflector roll movable left and right is arranged directly above the plating bath pot, It is preferable that the deflector roll is connected to a swinging link provided with a sink roll that is swingable about the rotation axis of the roll as a fulcrum and that winds a steel strip in the plating bath pot.

According to the present invention, in the apparatus having the above-mentioned structure, the snout which directly communicates between the processing space for pretreating the steel strip on the inlet side of the plating bath pot and the processing space and the plating bath pot for performing the plating treatment. It is preferable to provide a snout main body that has a conveyance path that shuts off the steel strip from the outside air and can be tilted about the pivot of the rear end as a fulcrum, and a steel strip conveyance path at the tip of this main body. It is preferable that the slider be formed of a slider that is successively formed and can be moved back and forth along the slider.

[0010]

According to the present invention, when the hot-dip galvanized steel sheet and the cold-rolled steel sheet are each manufactured in a single line, the steel strip transport path is arranged in the plating bath pot according to the type of the strip steel strip. By switching and using either a sink roll or a deflector roll arranged directly above the plating bath pot, a hot-dip galvanized steel sheet is obtained by passing through the plating bath pot, or a cold-rolled steel sheet is obtained by bypassing the plating bath pot. It is possible to do.

[0011]

1 to 3 show an example of a transport path changing device according to the present invention. Reference numeral 1 in the drawing is a plating bath pot that can be moved up and down (a lift mechanism is not shown), and 2 is a main body frame that constitutes a transfer path changing device, and this main body frame 2 can be provided with a lift mechanism. . 3 is a deflector roll having a drive source (motor, etc.) M ₁ and around which the steel strip S is wound (it may be non-driving if there is no abrasion such as abrasion due to contact with the steel strip) 4 is drive source by (motor or the like) M ₂ in the pivot rotation shaft 3a of the deflector roll 3 a swingable swing link, the swing link 4 winding the steel strip S in the plating bath pot 1 at its front end It has a hanging sync roll 4a. Further, 5 is a moving mechanism, for example, the moving mechanism 5 has wheels W adapted to the rail L installed on the main body frame 2 and has a truck 5a and a truck 5a which travel on the rail L by a driving source M ₃ .
Drive source M ₄ having a rack R engaging with the pinion gear P of
The pinion gear P can be driven by means of an elevating frame 5b for vertically moving the deflector roll 3 and the sink roll 4a.

Reference numeral 6 denotes a bath support roll fixed and held on the main body frame 2. The support roll 6 keeps the t-t path of the steel strip S constant and warps the steel strip S in the width direction. It has the function of modifying. 7 is a gas wiping nozzle which is also fixedly held on the body frame 2 (determines the coating weight), and 8 is a plating bath pot directly from the processing space (eg, heat treatment furnace) K without exposing the steel strip S to the outside air. It is Snout leading to 1.

In the apparatus having the above structure, in order to perform the plating treatment on the steel strip S, the steel strip S is wound around the sink roll 4a in the plating bath pot 1 and conveyed as shown in FIG. Then, when the plating process is stopped and the subsequent steel strip S is to be a cold-rolled steel sheet, the operation state is shown in FIG.
As shown in FIG. 7, the plating bath pot 1 is lowered to rotate the swinging link 4 by the drive source M ₂ , and the moving mechanism 5 is operated to move the carriage 5a and the lifting frame 5b.
The conveying path is changed so that the steel strip S is wound around the deflector roll 3 while setting the position.

The concrete procedure for changing the transport route is as follows. While lowering the plating bath pot 1, snout 8
The tip end portion (slider 8b) is moved backward, and the deflector roll 3 starts rotating (see FIG. 4). The carriage 5a is traversed, the elevating frame 5b is lowered, the sink roll 4a is turned, and the snout 8 is tilted at the same time so that the t-t path of the think roll 4a is kept vertical (see FIG. 5). Is performed until the position of the deflector roll 3 is below the sink roll 4a and coincides with the tt route.
Then, the swinging link 4 holding the sink roll 4a is further swung to retract from the pass line of the steel strip S (see FIG. 6). The elevating frame 5b is raised and stopped until the position of the deflector roll 3 returns to the original position where the sink roll 4a existed (see FIG. 7, this step may be omitted). Although the above procedure describes the production of the plated steel sheet to the production of the cold rolled steel sheet, when switching from the production of the cold rolled steel sheet to the production of the plated steel sheet, the route may be changed according to the reverse procedure.

In the apparatus having the construction shown in FIGS. 1 to 3 above, the t-t path in the figure in which the in-bath support roll 6 and the gas wiping nozzle 7 are arranged (see FIG. 1 or 4) ), It is preferable to keep it constant as much as possible from the viewpoint of avoiding complication of the apparatus even if the path is changed by switching rolls (the in-bath support roll 6 and the gas wiping nozzle 7 are fixed type). In the present invention, the deflector roll 3 and the sink roll 4a are moved vertically and horizontally by the moving mechanism 5,
Avoid route fluctuations.

8 to 10 show another example of the route changing device according to the present invention. In this example, a deflector roll 3 suspended and swingably supported via a first link 9 is arranged immediately above the plating bath pot 1, and the steel strip S in the plating bath pot 1 is placed on the deflector roll 3.
It has a structure in which a sink roll 4a around which is wound is provided and a second link 10 which is swingable about its rotation shaft 3a is connected.

In order to change the transportation route to manufacture a cold rolled steel sheet from the state of plating treatment, the frame 11 in which the in-bath support roll 6 and the gas wiping nozzle 7 are fixedly held.
Is lifted from the t-t path by using the lifting cylinder 12 and the traverse means 13. Then, the turning to the second link 10 around the rotation shaft 3a of the deflector roll 3, the steel strip S by the first link 9 by pivoting through a connecting shaft 14 connected to a drive source M ₅ sink roll 4a The winding state is changed to the winding state of the steel strip S by the deflector roll 3.

As shown in FIGS. 11 to 13, the operation of the device having the structure shown in FIGS. 8 to 10 is deflected by swinging the first link 9 and the second link 10. Since the rolls 3 and the sink rolls 4 can be used alternately, it is not necessary to separately provide a moving mechanism for moving the frame 15 itself holding the deflector rolls and the sink rolls up and down, left and right, and the support rolls 6 in the bath can be used.
Except for the mechanism for moving the gas wiping nozzle 7, it is extremely advantageous for simplifying the structure of the apparatus.

The concrete procedure for changing the transport path is as follows. The lifting cylinder 12 is operated to raise the frame 11 to lift the gas wiping nozzle 7 and the bath support roll 6
Is lifted from the plating bath pot 1 and the traverse means 13 is operated to retract from the tt route. And
The tip portion (slider 8b) of the snout 8 is retracted and the deflector roll 3 starts rotating (FIG. 11).
reference). While keeping the t-t path vertical, the deflector roll 3
Swinging of the sink roll 4a, and tilting of the snout 8 are simultaneously performed (see FIG. 12). The above state is continued until the position of the deflector roll 3 is below the sink roll 4a and coincides with the tt route. Then, after that, the sink roll 4a is further tilted and retracted from the pass line of the steel strip S (see FIG. 13). In the example shown here, the support roll 6 and the gas wiping nozzle 7 can be retracted in the bath, but this is to avoid interference with the sink roll 3 and the deflector roll 4a, and strictly speaking, It suffices to retract the one-side (snout side) bath support roll and gas wiping nozzle.

An example of a device according to the present invention is shown in FIG.
~ A structure having a structure as shown in Fig. 16 is also applicable. In the example shown here, a cart 17 that is movable right and left along the rail 16a of the fixed frame 16 is provided directly above the plating bath pot 1, and the deflector roll 3 is disposed there, and at the same time, the deflector roll 3 is provided. The steel strip S can be swung about the rotation shaft 3a as a fulcrum and can be moved in the plating bath pot 1.
Swing link 18 with sink roll 4a for winding
It is a structure that is connected.

Also in the apparatus having the configuration shown in FIGS. 14 to 16, the deflector roll 3 and the sink roll 4a are replaced when changing the transport path of the steel strip S, as in the configuration shown above. Use individually.

Since the deflector roll 3 can be moved to the left and right together with the sink roll 4a as shown in the operating states of FIGS. 17 to 19, the deflector roll 3 and the sink can be changed when the conveying path is changed. The roll 4a is moved to the left or right by the carriage 17 so as to prevent the tt route from changing.

The concrete procedure for changing the transfer path is as follows. First, the frame 11 is lifted by the lifting cylinder 12 to lift the in-bath support roll 6 and the gas wiping nozzle 7 from the plating bath pot 1, and the traverse means 13 is operated. The in-bath support roll 6 and the gas wiping nozzle 7 are retracted from the tt route. And snout 8
Then, the tip end portion (slider 8b) is retracted and the deflector roll 3 starts rotating (see FIG. 17). While the tt route is kept vertical, the cart 17 is traversed, the sink roll 4a is turned, and the snout 8 is tilted at the same time (see FIG. 18). The above state is continued until the position of the deflector roll 3 is below the sink roll 4a and coincides with the tt route. Then, after that, the sink roll 4a is further tilted and retracted from the pass line of the steel strip S (FIG. 19).
reference).

In any case of the present invention, a deflector roll 3 is provided directly above the plating bath pot 1, and the transport roll is switched by alternately using the deflector roll 3 and the sink roll 4a in the plating bath pot 1. Even with a single line, hot-dip galvanized steel sheets and cold-rolled steel sheets can be used as needed without causing scratches on the surface of the steel strip or damage to the rolls caused by cooling and solidification of the plating metal. It can be easily created.

Steel strip S treated on the inlet side of the plating bath pot 1
In the case of introducing the metal into the plating bath pot without exposing it to the outside air, the drawings (FIG. 1, FIG. 8, FIG.
The snout 8 shown in (4) becomes extremely effective.

The snout 8 has a steel strip conveying path d and is tiltable about a pivot e (the deflector roll or the like can be used) at the rear end as a fulcrum, and a tip portion of the snout main body 8a. In the following, a slider 8b is formed which continuously forms a conveying path d for the steel strip S and has a retractable joint that can be moved back and forth along the conveying path d. The snout body 8a is tilted by the first cylinder S ₁ and the slider 8b is moved by the second cylinder S ₂ . 8b is moved forward or backward to immerse the tip in the plating bath pot 1.

[0027]

[Effects of the Invention] Using the apparatus configured as shown in Figs. 1 to 3 above, a plated steel sheet and a cold-rolled steel sheet were produced in a single line, and the time required to switch the lines was investigated. .

As a result, conventionally, after the line was stopped, the steel strip was manually cut, the transfer route was switched, and the steel strip was connected. Therefore, the time required for this was about 90 minutes. According to the invention, it was confirmed that the transfer route can be switched (the line is not stopped) in about 10 times. In addition, we also investigated the usage amount of plate passing materials (plate materials used for adjusting the manufacturing conditions when changing the processing) in hot dip plating line (rate of occurrence of downgrading). The amount was 700 t / month, but according to the present invention, about 3
It could be reduced to 0t / month.

Thus, according to the present invention, the transfer route can be switched in an extremely short time without stopping the traveling of the steel sheet, so that the production efficiency can be remarkably improved, and the plating metal can be cooled. Since no scratches due to solidification are generated, a product with stable quality can be manufactured for a long period of time.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of an apparatus according to the present invention (FIG. 2).
II cross section).

FIG. 2 is a plan view of the device of FIG.

3 is a BB view of FIG. 1. FIG.

FIG. 4 is an explanatory diagram of an operating state of the device shown in FIG.

5 is an explanatory diagram of an operating state of the device shown in FIG. 1. FIG.

FIG. 6 is an explanatory diagram of an operating state of the device shown in FIG.

FIG. 7 is an explanatory diagram of an operating condition of the device shown in FIG.

FIG. 8 is a view showing another example of the device according to the present invention (cross section I-I in FIG. 9).

9 is a plan view of the apparatus of FIG.

10 is a BB view of FIG. 8. FIG.

FIG. 11 is a diagram showing an operating state of the device shown in FIG.

FIG. 12 is a diagram showing an operating condition of the apparatus shown in FIG.

FIG. 13 is a diagram showing an operating condition of the apparatus shown in FIG.

FIG. 14 is a diagram showing another example of the device according to the present invention (cross section I-I in FIG. 15).

FIG. 15 is a plan view of the device of FIG.

16 is a BB view of FIG. 14. FIG.

FIG. 17 is a diagram showing an operating condition of the device shown in FIG. 14.

FIG. 18 is a diagram showing an operating condition of the device shown in FIG. 14.

FIG. 19 is a diagram showing an operating condition of the apparatus shown in FIG.

[Explanation of symbols]

1 Plating Bath Pot 2 Body Frame 3 Deflector Roll 4 Swing Link 4a Sink Roll 5 Moving Mechanism 5a Truck 5b Lifting Frame 6 Bath Support Roll 7 Gas Wiping Nozzle 8 Snout 9 1st Link 10 2nd Link 11 Frame 12 Lifting Cylinder 13 Traversing means 13a cylinder 13b guide 14 connecting shaft 15 connecting shaft holding frame 16 fixed frame 16a rail 17 bogie 17a wheel 18 swinging link M ₁ drive source M ₂ drive source M ₃ drive source M ₄ drive source M ₅ drive source M ₆ drive Source S Steel strip L Rail W Wheel R Rack

Claims (8)

[Claims] 1. A sink roll in which a hot-dip galvanized steel sheet and a cold-rolled steel sheet are manufactured in a single line, and a steel strip transport path is arranged in a plating bath pot in accordance with the type of the strip steel strip. Or a deflector roll disposed directly above the plating bath pot, which is used by switching between the plating bath pot and the bypass, and a hot dip plated steel plate or a cold-rolled steel plate. A method for changing the transfer route for steel strips on a dual-use production line. 2. A body frame is provided directly above the plating bath pot, and a deflector roll around which a steel strip is wound around the body frame, and the rotary shaft of the deflector roll is oscillated as a fulcrum, and the tip of the deflector roll is inside the bath pot. A swinging link having a sink roll around which the steel strip is wound is arranged, and the deflector roll has a moving mechanism capable of moving vertically and horizontally with the swinging link. apparatus. 3. The moving mechanism comprises a carriage for holding the deflector roll together with the swing link and moving the deflector roll left and right on the main body frame, and a lifting frame for vertically moving the deflector roll and swing link on the carriage. The device according to 2. 4. The apparatus according to claim 2, wherein the plating bath pot has a lifting mechanism. 5. A deflector roll suspended and supported swingably via a first link is provided directly above the plating bath pot, and the deflector roll is swingable about a rotation axis of the roll as a fulcrum, and A steel strip transport path changing device having a second link provided with a sink roll for winding a steel strip in a plating bath pot. 6. A deflector roll which can be moved left and right is arranged directly above the plating bath pot, and the deflector roll can be swung about the rotation axis of the roll as a fulcrum so that a steel strip is formed in the plating bath pot. An apparatus for changing the conveying path of a steel strip, characterized in that a swing link provided with a sink roll around which the steel strip is wound is connected. 7. A treatment space for pretreating the steel strip on the entrance side of the plating bath pot, and a snout for directly connecting the treatment space and the plating bath pot for plating treatment. The device according to any one of 5 and 6. 8. A snout body having a conveying path for shutting off the steel strip from the outside air, which can be tilted about a pivot of a rear end thereof as a fulcrum, and a leading end portion of the snout body to continue the conveying path of the steel strip. 8. The device according to claim 7, further comprising a slider which is formed as a unit and can be moved back and forth.