JPH07118820A - Method for changing over carrying course of hot-dip coated steel sheet and cold-rolled steel sheet and device therefor - Google Patents

Abstract

PURPOSE:To quickly change over a carrying course of steel sheet in a shared manufacturing facility, in which a hot-dip coated steel sheet and a cold-rolled steel sheet can be manufactured in the same facility. CONSTITUTION:In the case of manufacturing the hot-dip coated steel sheet 1, a plating vessel 2 is risen to the plating position by using an elevating device 10 and a fixedly arranged sink roll 3 is dipped into a plating bath 2a, and also, a deflector roll 11 is retracted to the position outside a line, and the steel sheet 1 is wound on the sink roll 3 and carried. In the case of manufacturing the cold-rolled steel sheet, after retracting the plating vessel 2 downward by the elevating device 10, the deflector roll 11 is advanced to the position inside the line by using a device 12 for forward/backward movement and the steel sheet is wound on the deflector roll 11 and carried, thereby the carrying course is changed over.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for switching a steel sheet conveying path in a combined manufacturing facility capable of manufacturing hot dip plated steel sheet and cold rolled steel sheet with the same equipment.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, in a plating apparatus section arranged on a hot-dip galvanizing equipment line, a sink roll 3 and in-bath support rolls 8a, 8b are placed in a plating bath 2a in a plating tank 2. And other equipment in the bath are arranged, and the steel sheet 1 for hot dip coating that enters from the heat treatment furnace 5 that is a pretreatment facility is introduced into the plating bath 2a in the plating tank 2 through a snout 6 for isolating it from the oxidizing atmosphere. It is like this.

The steel sheet 1 thus dipped in the plating bath 2a is hot dip galvanized while changing its direction of travel upward through the sink roll 3, and a pair of in-bath support rolls arranged opposite each other. It is supported by 8a and 8b, pulled up in the vertical direction, pulled out from the plating bath 2a, and wiped off excess molten zinc by a gas jet ejected from a pair of gas wiping nozzles 4a and 4b, so that a predetermined zinc adhesion amount is obtained. Further, a top roll 9 for horizontally changing the plated steel plate 1 is provided above the plating tank 2.

In order to use a hot-dip galvanized steel sheet production line requiring such a plating treatment as a cold-rolled steel sheet production facility, the steel sheet conveyance route is switched so that the steel sheet does not enter the plating bath of the plating tank. There must be. Until now, to switch the steel sheet transportation path, the steel sheet is cut near the plating equipment and the steel sheet is transported without being immersed in the plating bath using the transportation roll installed above or near the plating tank. , So-called pass change is being performed.

To change the path, it is necessary to cut the steel plate, change the transfer route to the transfer roll, connect the steel plate, etc., as described above. Therefore, there is a problem in that not only the productivity is lowered, but also maintenance work is increased because the maintenance work has to be performed. In order to solve such a problem, Japanese Patent Laid-Open No. 2-34762 uses a sink roll immersed in a plating bath in a plating tank at the time of producing a hot dip plated steel sheet, while the sink roll at a time of producing a cold rolled steel sheet. It has been proposed to use a sink roll as a deflector roll at the elevated position after pulling it up from the plating bath using an elevating device.

[0006] However, it is very difficult to use the sink roll as it is by just pulling up the sink roll used by immersing it in the plating bath during the production of the cold rolled steel sheet. For example, since the plating metal is wrapped around and adheres to the body of the sink roll that the cold-rolled steel sheet contacts,
Unless this is completely removed, there is a problem in that the cold-rolled steel sheet is flawed. In addition, the sink roll bearing is in a state where plated metal has entered the bearing,
When the sink roll is pulled upward from the plating bath, the plating metal solidifies and cannot be used as a bearing.

On the other hand, in the plating treatment in the continuous hot-dip galvanizing line, since the plating work is made continuous by combining steel sheets of various sizes, it is necessary to adjust the plating treatment conditions to the plating conditions of each plated steel sheet. Therefore, various plated steel sheets are subjected to plating treatment by predetermining the treatment order so that the plating conditions (for example, pretreatment conditions, plating bath conditions, steel plate running conditions, etc.) do not change suddenly. However, in the present situation where demand is diversifying, it is difficult to sufficiently satisfy the plating treatment conditions only by such measures. Therefore, in reality, a dummy material (hereinafter referred to as a plate material) for adjusting plating conditions is appropriately inserted to perform continuous plating. Further, a plate material is used to adjust the plating conditions when the manufacturing equipment is stopped or restarted for maintenance work or the like. Moreover, since these strips are plated in the same manner as the process strips shipped as products, it is impossible to reuse the strips that have been used once, resulting in an increase in cost.

[0008]

In order to make it possible to use the hot-dip galvanized steel sheet manufacturing equipment as the cold-rolled steel sheet manufacturing equipment, it is necessary to easily switch the strip conveying path in the plating equipment part in a short time. However, if the sink roll used during hot-dip galvanized steel sheet production is simply pulled up above the plating bath, flaws will occur in the strip due to the wrapping of the molten metal around the roll body and adhesion of the molten metal to the bearing.
Since the non-rotation of the sink roll due to solidification or the like causes deterioration of quality such as generation of scratches, it is extremely difficult to use the sink roll as it is when manufacturing the cold-rolled steel sheet.

The present invention solves the above problems, and can switch from hot-dip steel sheet equipment to cold-rolled steel sheet production equipment, or from cold-rolled steel sheet production equipment to hot-dip steel sheet production equipment as quickly and easily as possible. An object of the present invention is to provide a method and an apparatus for switching a steel sheet conveying path of a hot-dip galvanized steel sheet / cold-rolled steel sheet production facility. Also, when used as hot dip plating equipment, when the dimensions of the strip to be processed change significantly, or when the production equipment is stopped and restarted for maintenance work, etc. (EN) Provided are a steel sheet transport path switching method and device capable of plate switching and capable of performing a path switching to a plating path quickly and easily when processing conditions are satisfied.

[0010]

According to a first aspect of the present invention, a sink roll is fixed in a method for switching a steel sheet conveying path of a combined manufacturing facility capable of manufacturing a hot dip plated steel sheet and a cold rolled steel sheet by the same equipment. The plating tank containing the plating bath is vertically movable between the plating position and the lower retreat position, and the deflector roll is provided on the side of the line between the plating position and the lower retreat position. When manufacturing hot-dip galvanized steel sheets horizontally arranged between the retracted position and the in-line position, use a lifting device to raise the plating tank to the plating position, and place the sink roll fixed in place. While being immersed in the plating bath and with the deflector roll retracted to the side of the line, the hot dip plated steel sheet is wound around a sink roll and conveyed upward, while cold rolled steel In the case of manufacturing, the state where the deflector roll is moved from the retracted position on the side of the line to the in-line position by using the forward / backward movement device while descending to the retracted position below the sink roll in which the plating tank is fixedly arranged. A method for switching a hot-dip galvanized steel sheet and cold-rolled steel sheet conveyance path is characterized in that the cold-rolled steel sheet is wound around a deflector roll and conveyed upward.

Further, the present invention according to claim 2 is a sink which is fixed at a plating position in a steel plate transport path switching device of a combined manufacturing facility capable of manufacturing hot dip plated steel sheet and cold rolled steel sheet by the same equipment. A roll,
A plating tank that is vertically movable between a plating position and a lower withdrawal position; an elevating device that supports the plating tank from below and elevates and lowers between the plating position and the lower withdrawal position; A deflector roll horizontally arranged between the retracted position on the side of the line and a position in the line between the lower position of the plating tank and the retracted position on the line, And a forward-backward moving device for moving the steel plate between the two.

[0012]

[Function] When manufacturing a hot-dip steel sheet, the hot-dip steel sheet is wound around the sink roll and conveyed upward while the plating tank is elevated to the plating position and the sink roll is immersed in the plating bath. When manufacturing steel sheets, lower the plating tank to the retreat position below, move the deflector roll from the side of the line to the in-line position between the sink roll at the plating position and the plating tank at the retreat position, and perform cold rolling. The steel sheet is wound around a deflector roll and conveyed upward.

Therefore, unlike the conventional case where a sink roll is used as a deflector roll, it is possible to prevent the occurrence of defects such as flaws in the cold-rolled steel sheet and non-rotation of the sink roll due to adhesion and solidification of plated metal to the sink roll. Not only that, the time required for switching between the hot dip plated steel sheet and the cold rolled steel sheet is shortened.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the hot-dip galvanized steel sheet manufacturing equipment of the present invention shown in FIG. 3, a plating tank 2 is arranged in accordance with the pass line of the steel sheet 1 sent from the continuous heat treatment furnace 5. A conveying roll 7 for immersing the steel sheet 1 in the plating bath 2a is arranged on the entrance side of the plating tank 2 to change the traveling direction of the steel sheet 1 entering the plating bath 2a in the plating tank 2 and pull it upward. The sink roll 3 and the like are attached. Further, a top roll 9 for pulling up the plated steel sheet 1 from the plating bath 2 and changing its running direction to a horizontal direction is provided above the plating bath 2.

In the manufacturing process of such a hot dip plated steel sheet, the sink roll 3 is placed in the plating bath 2a in the plating tank 2.
Wiping in which equipment such as a bath is placed in a bath to form a transport path through which the steel plate 1 passes through the plating bath 2, and a plating solution attached to the steel plate 1 that is drawn out from the plating bath 2 is placed directly on the plating bath 2. Controlling to a predetermined plating thickness by wiping with the nozzles 4a and 4b is similar to the case of the conventional example shown in FIG.

In the present invention, the sink roll 3 and the in-bath support rolls 8a, 8b and other in-bath equipment are fixedly arranged, while the lower part of the plating tank 2 containing the plating bath 2a is provided with a lifting device 10 (for example, a screw jack). Use mechanism)
1 and 2, the plating position is such that the plating tank 2 is raised to immerse the sink equipment such as the sink roll 3 in the bath as shown in FIGS. 1 and 3, and FIG. As shown in the figure, the elevator 10 can be used to move up and down between the sink roll 3 fixedly arranged and the retracted position.

As shown in FIGS. 1 and 2, a deflector roll 11 is provided between the plating position of the plating tank 3 and the retreat position below and a forward / backward moving device between the retreat position on the side of the line and the in-line position. It is arranged so that you can move forward and backward using 12. The slide frame 13 of the forward / backward moving device 12 has a structure that horizontally moves on the slide base 15, and a screw shaft 17 is screwed into a nut member 16 attached to one end of the slide frame 13. The base end of the screw shaft 17 is rotatably supported by a bearing 15a, and is connected to a motor 18 via a shaft joint 19. When the motor 18 is normally or reversely rotated, the nut member 16 integrally moves with the slide frame 13 only in the direction shown by the arrow A as the screw shaft 17 rotates.

A bearing 14 mounted on the slide frame 13 supports a support shaft 11a of the deflector roll 11, and the base end of the support shaft 11a is connected via a shaft joint 21 to a motor.
The deflector roll 11 is connected to the deflector roll 11 by rotating the motor 20. Next, the operation of the present invention will be described. When manufacturing a hot dip plated steel sheet, the deflector roll 11 is retracted out of the line as shown in FIG. 1, while the elevating device 10 raises the plating tank 2 to the plating position and the sink roll 3 and the bath support. In-bath equipment such as rolls 4a and 4b is immersed in the plating bath 2a, and as described above, the steel sheet 1 is subjected to hot dip galvanizing while being conveyed by the sink roll 3 in the plating bath 2a.

When switching from the hot-dip galvanized steel plate manufacturing process to the cold-rolled steel plate manufacturing process, the plating tank 2 is lowered from the plating position to the retreat position below by using the elevating device 10 as shown in FIGS. 2 and 4. Let Next is Syncroll 3
The tension applied to the steel plate 1 wound around the steel plate 1 is relaxed and the steel plate 1 is placed between the sink roll 3 and the plating tank 2 in the retracted position.
The slack is made.

Next, the screw shaft 17 is rotated by, for example, rotating the motor 18 of the moving device 12 in the forward direction, whereby the slide frame 13 is moved forward via the nut member 16.
In this way, when the deflector roll 11 mounted on the slide frame 13 is moved forward from the retracted position on the side of the line to the position inside the line, the sink roll 3 and the plating tank 12 are moved.
The deflector roll 11 is inserted into the loop of the steel sheet 1 which is in a slack state between and. Thereafter, tension is applied to the steel plate 1 and the steel plate 1 is wound around the deflector roll 11 and switched to the transport route for cold-rolled steel plate production as shown in FIGS. 2 and 4. After the switching, the motor 20 is rotationally driven to rotate the deflector roll 11 to convey the steel plate 1.

When switching, the support roll 8 in the bath
It is preferable to leave a, 8b and the wiping nozzles 4a, 4b in an open state, and further remove the plating metal adhered to the equipment in the bath such as the sink roll 3 and the in-bath support rolls 8a, 8b. It is desirable to keep it. The switching from the cold-rolled steel sheet manufacturing process to the hot dip plated steel sheet manufacturing process may be performed by performing the reverse operation to the switching from the hot dip steel sheet manufacturing process to the cold rolled steel plate manufacturing process, and thus detailed description thereof will be omitted.

Further, the method of not immersing the strip material, which is often used in the hot-dip galvanized steel sheet manufacturing process, in the plating bath is to switch from the hot-dip galvanized steel sheet manufacturing step to the cold-rolled steel sheet manufacturing step and from the cold-rolled steel sheet manufacturing step. It is clear that the same thing as the switching to the hot-dip galvanized steel sheet manufacturing process may be carried out as described above, and detailed description thereof will be omitted.

In this example, a specific example is shown in which the deflector roll 11 is supported from only one side. However, after the deflector roll 11 is inserted into the line, the deflector roll 11 is supported on both sides even on the non-insertion side. It is also possible to do so.

[0024]

As described above, according to the present invention, the following effects can be obtained. It is possible to switch production between the cold-rolled steel sheet and the hot-dip plated steel sheet as quickly and easily as possible, and thus it is possible to greatly improve the operating rate of the production equipment. When the size of the strip to be processed during the hot dip galvanized steel sheet production changes significantly, or when the stripping material needed to operate after the production facility is stopped for maintenance work etc. is not required to be immersed in the plating bath, It can be used and the production cost can be reduced. Since a dedicated deflector roll is used without using bath equipment such as sink rolls used during hot-dip galvanized steel plate manufacturing during cold-rolled steel plate manufacturing, it does not cause scratches or scratches on the steel plate and is high. It is possible to manufacture quality products in a stable and reliable manner.

[Brief description of drawings]

FIG. 1 is a front view showing an arrangement of a plating tank and a deflector roll at the time of manufacturing a hot dip plated steel sheet of the present invention.

FIG. 2 is a front view showing the arrangement of a plating tank and deflector rolls when manufacturing the cold-rolled steel sheet of the present invention.

FIG. 3 is a side view showing an apparatus arrangement during production of the hot dip plated steel sheet of the present invention.

FIG. 4 is a side view showing an apparatus arrangement during production of the cold-rolled steel sheet of the present invention.

FIG. 5 is a side view showing an apparatus arrangement during hot-dip galvanizing production of a conventional example.

[Explanation of symbols]

 1 Steel Plate 2 Plating Bath 3 Sink Roll 4 Gas Wiping Nozzle 5 Heat Treatment Furnace 6 Snout 7 Transport Roll 8 Support Roll in Bath 9 Top Roll 10 Lifting Device 11 Deflector Roll 12 Forward and Backward Moving Device 13 Slide Frame 14 Bearing 15 Slide Base 16 Nut Member 17 Screw shaft 18 Motor 19 Shaft coupling 20 Motor 21 Shaft coupling

Claims (2)

[Claims] 1. A method for switching a steel sheet transport path of a combined manufacturing facility capable of manufacturing hot dip plated steel sheet and cold rolled steel sheet with the same equipment, wherein a sink roll is fixedly arranged and a plating tank containing a plating bath is provided. It is arranged so that it can be moved up and down between the plating position and the lower withdrawal position, and the deflector roll is horizontally advanced and retracted between the withdrawal position on the side of the line and the in-line position between the plating position and the lower withdrawal position. When manufacturing hot-dip galvanized steel sheets freely arranged, the elevating device is used to raise the plating tank to the plating position, the fixed sink roll is immersed in the plating bath, and the deflector roll is placed on the side of the line. While the hot dip plated steel sheet is wound around the sink roll and conveyed upward in the retracted state, when manufacturing a cold rolled steel sheet,
The cold-rolled steel sheet is deflected from the retracted position on the side of the line to the in-line position by using the forward / backward movement device while lowering the plating tank to the retracted position below the sink roll. A hot-dip plated steel sheet and a cold-rolled steel sheet transfer path switching method, which is wound around a sheet and conveyed upward. 2. A steel plate transport path switching device of a combined manufacturing facility capable of manufacturing a hot dip plated steel sheet and a cold rolled steel sheet by the same equipment, a sink roll fixedly arranged at the plating position, A plating tank that is vertically movable between an evacuation position, an elevating device that supports the plating tank from below and elevates between the plating position and a lower evacuation position, and the plating position and the lower evacuation tank evacuation The deflector roll is arranged horizontally between the retracted position on the side of the line and the in-line position, and the deflector roll is retracted between the retracted position on the side of the line and the in-line position. A transport path switching device for a hot dip plated steel sheet or a cold rolled steel sheet, comprising a forward and backward moving device.