JP6065489B2 - Slab conveying equipment and slab conveying method - Google Patents

Description

  The present invention relates to a technique having a feature in the process during conveyance in which a slab cast by continuous casting is conveyed to a heat treatment process of a hot rolling facility as a next process.

When the processing capacity of the hot rolling facility is larger than the processing capacity of continuous casting, the casting amount can be increased so that the width of the cast piece cast by continuous casting is doubled. In such a case, it becomes possible to greatly expand the steelmaking capability. Hereinafter, a slab whose width is doubled as described above is also referred to as a double-width material.
In general, the double-width material cast to the above-mentioned double-width material is transported to a standby yard of a heat treatment process by a transport table, and after cooling to the cold-width material in the standby yard, the double-wide material Is divided into two by gas cutting. Subsequently, each divided slab is charged into a heating furnace, and heating for hot rolling is performed.
Here, in Patent Document 1, in order to perform hot division, it is described that the slab is subjected to heat retention or reheating and then divided. Patent Document 2 describes a method of forming a steel strip by forming a slit offline in a slab, followed by heating and hot rolling, and then dividing the steel strip in the next step after the rolling. Yes.

JP 58-141841 A JP-A-57-175004

When the slab produced by continuous casting is transported to the hot-rolling heat treatment process, that is, when the double-width slab is gas-cut off and divided into two slabs offline, The furnace will be charged. Such a thing leads to the deterioration of the fuel consumption rate and the reduction of steel production efficiency.
In addition, as described in Patent Document 1, in order to perform hot division, in the method of dividing the double-width slab after performing heat insulation and reheating, it takes time to perform processing for hot division. Therefore, there is a problem that the production increase effect of steelmaking by casting at a double width is low, and there is a case where it is difficult to insert the slab into the heating furnace in the state of a hot piece.

Further, as described in Patent Document 2, in the method of dividing the slab in the next step after the slab is heated in a heating furnace and hot-rolled with the double-width material, the slab remains as the double-width material. On the other hand, since heating and rolling are performed, there is a risk of deteriorating the fuel consumption rate and reducing the rolling efficiency.
The present invention has been made in consideration of the above points, and aims to increase the capacity of steelmaking while suppressing deterioration of the fuel consumption rate and lowering of the steel production efficiency.

In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention is a slab conveying facility for conveying a slab cast by continuous casting to a heat treatment process by a conveying table while maintaining a high temperature .
To the position of the conveyance table slab is the transport is assumed to pass over the conveyor table at 800 ° C. or higher, it is positionable positioned between conveying rollers in which at least the lower portion is adjacent cast coming is the transported One hot saw capable of cutting a piece into two along the longitudinal direction, a width direction restraining member provided with a pair of a plurality of transport rollers on both sides in the width direction, and an upper pressing member parallel to the transport surface It is provided.

Next, the invention described in claim 2 is a slab conveying method for conveying a slab cast by continuous casting to a heat treatment step while maintaining a high temperature .
When it is determined that the processing capability in hot rolling is larger than the casting capability in the continuous casting, the casting is performed by changing the width of the slab in the continuous casting to a double width, and the slab is When transporting the cast slab at 800 ° C or higher, center the center of the slab in the width direction by the width direction restraining member and press the slab from the upper side by the upper pressing member while transporting at least the lower part between adjacent transport rollers It is characterized in that it is cut from the upper surface to the lower surface along the longitudinal direction by one hot saw arranged so as to be divided into two and then transported to the heat treatment step.

According to the present invention, the slab is cut at a high temperature and divided into two during the conveyance of the slab to the heat treatment step constituting a part of the hot rolling facility, that is, the slab is divided online. I can do it. As a result, it becomes possible to shift to a heat treatment step (for example, charging into a heating furnace) with a hot piece.
As a result, it is possible to achieve an increase in steelmaking capacity while suppressing deterioration in fuel consumption rate and reduction in production efficiency.

It is the figure which illustrated typically the example of the conveyance line of the slab from a steelmaking process to a hot-rolling installation. It is a typical side view which shows the equipment state of the cutting position in conveyance and its vicinity position. It is a typical top view which shows the equipment state of the cutting position in conveyance and its vicinity position. However, the conveyance roller of the conveyance table is omitted in the drawing.

Next, embodiments of the present invention will be described with reference to the drawings.
In general, the steelmaking process includes hot metal pretreatment, converter, secondary refining, and continuous casting processes. By the steelmaking process that implements these processes, the target slab is made from pig iron produced in the ironmaking process ( Steel). Subsequently, the manufactured slab is transported to a hot rolling facility by a slab transport facility H provided along a transport line L as shown in FIG. In the hot rolling equipment, the slabs that have been transported are sequentially heated in the heating furnace 10 and then transferred to hot rolling. Specifically, a slab having a desired cross-sectional dimension is continuously manufactured by a continuous casting machine, and the slab cut to a target length by a gas cutter is sequentially transferred along the conveying line L. It is conveyed to the heat treatment process (heat treatment by the heating furnace 10) of the hot rolling equipment, which is a process.

The slab conveying equipment includes, for example, a conveying table arranged along a conveying line L extending from the exit side of the continuous casting machine to the inlet of the heating furnace 10 and the standby yard 11 for waiting for heating. .
The conveyance table 1 includes a plurality of conveyance rollers 2, and the plurality of conveyance rollers 2 are arranged in parallel along the conveyance line (see FIG. 2). A part or all of the plurality of transport rollers 2 are rotationally driven by a drive actuator such as a motor, so that the slab placed on the rollers can be transported at a target transport speed.

  Here, the slab 3 at the time when the gas is cut by the continuous casting machine is a hot piece in a temperature range of about 950 ° C. to 1100 ° C., for example. And the said slab 3 is gradually air-cooled during conveyance with the said conveyance table 1, and a temperature fall arises. However, since the temperature drop during conveyance can be roughly predicted, it is possible to assume the temperature of the slab 3 during conveyance at each position of the conveyance table 1.

And as shown in FIG.2 and FIG.3, the hot saw 4 is installed with respect to the position of the conveyance table in which the temperature of the slab 3 is assumed reliably 800 degreeC or more in the said conveyance table 1. FIG. The position of the conveyance table that cuts the slab 3 with the hot saw 4 is referred to as a cutting position C-AREA during conveyance (see FIG. 1).
FIG. 2 and FIG. 3 are conceptual diagrams for explaining the configuration of the position of the transfer table 1 including the cutting position C-AREA during transfer.

  The hot saw 4 is disposed so that at least the lower part of the hot saw 4 is positioned between the adjacent transport rollers 2 at the cutting position C-AREA during transport, as shown in FIG. A moving mechanism 5 that can move between two positions is provided. In FIG. 2, the case where the moving mechanism of the hot saw 4 is comprised with a cylinder apparatus is illustrated. As the moving mechanism 5, a known moving mechanism such as a swing arm method can be adopted. However, a mechanism that can hold the hot saw 4 at the cutting position against the load applied to the hot saw 4 during cutting is preferable.

  As shown in FIG. 3, the hot saw 4 is installed at the center or substantially the center in the width direction of the position where the slab 3 passes. Further, as shown in FIG. 2, the hot saw 4 conveys the rotating shaft of the hot saw 4. It is set in the same direction as the roller 2. In the present embodiment, the rotation axis of the hot saw 4 is set so as to extend orthogonally and horizontally to the transport line. Thereby, the slab 3 conveyed by the conveyance table 1 can be cut in the longitudinal direction by the hot saw 4.

  Moreover, as a slab conveying facility, a pair of width guide walls 6 are provided on both sides in the width direction of the conveying table 1 as shown in FIG. The distance between the paired width guide walls 6 is set to be larger than the maximum width of the slab 3 to be conveyed. Further, the pair of width guide walls are arranged along the conveying line L continuously or intermittently.

Further, as shown in FIG. 3, a width direction restraining member 7 is disposed at one or more locations upstream of the hot saw 4 in place of the width guide wall 6.
As shown in FIG. 3, the width direction restricting members 7 are provided in pairs on both sides in the width direction of the transport roller 2, and can be moved in the width direction by a width restricting moving mechanism 8. In FIG. 3, a cylinder device is illustrated as the movement mechanism 8 for restraining the width. The movement mechanism 8 for restraining the width may employ another known movement mechanism such as a linear motion device. The pair of width direction restraining members 7 are controlled so as to be displaced synchronously so that the position at which the hot saw 4 is disposed in the width direction is set as a reference position (center position) so as to be separated from the reference position by the same distance. Is done. As shown in FIG. 3, each width direction restraint member 7 includes a width restraint portion main body 7a and a plurality of lateral contact rollers 7b supported by the width restraint portion main body 7a.

  The width constraining portion main body 7 a is configured such that the surface facing the center in the width direction of the transport table 1 is a surface parallel to the transport direction of the slab 3. The plurality of lateral contact rollers 7b are provided side by side in the transport direction in a state in which a part thereof protrudes from the parallel surface of the width restricting portion main body 7a. Each of the lateral contact rollers 7b is supported by the width restricting body 7a so as to be rotatable about the vertical axis as a rotation axis. The lateral contact roller 7b is not driven.

  Further, as shown in FIG. 2, an upper pressing member 9 is disposed at one or more locations upstream of the hot saw 4. The upper pressing member 9 is disposed at a position that can face the upper surface of the slab 3 being conveyed from above. The upper pressing member 9 can be moved in the vertical direction by the moving mechanism 12, and can move the slab 3 from above by moving downward. The upper pressing member 9 includes an upper pressing portion main body 9a and a plurality of vertical contact rollers 9b supported by the upper pressing portion main body 9a.

  The lower surface of the upper presser body 9a is a surface parallel to the transport surface formed by the transport roller 2. In the present embodiment, the lower surface of the upper pressing portion main body 9a is set to be a horizontal plane. Further, the plurality of vertical contact rollers 9b are provided along the transport line L in a state in which a part protrudes downward from the lower surface of the upper pressing portion main body 9a. Each of the vertical contact rollers 9b is supported by the upper pressing portion main body 9a so as to be rotatable about an axis parallel to the conveyance roller 2 (an axis extending in the width direction of the conveyance line L) as a rotation axis. The vertical contact roller 9b is not driven. The vertical contact roller 9b is preferably arranged at a position facing the transport roller 2 in the vertical direction.

(About operation and others)
Casting is continuously performed by a continuous casting machine, and the cast slab 3 is cut to a target length by a gas cutting machine. For example, the length of the slab 3 is adjusted to a length of 10 to 12 m. The cut slab 3 is transported toward the heating furnace 10 along the transport line L by the transport table 1 constituting the slab transport facility H. The conveyed slab 3 is inserted into the heating furnace 10 as it is or loaded on the standby yard 11. Depending on the case, it is conveyed to the care area 13 and subjected to individual processing offline. The slab 3 loaded in the standby yard 11 is appropriately charged into the heating furnace 10. The slab 3 heated to the target temperature in the heating furnace 10 is conveyed to a hot rolling mill and hot rolled to a target plate thickness.

  Here, the hot saw 4, the pair of width direction restraining members 7, and the upper pressing member 9 normally have a state of waiting in the standby position as an initial value. The standby position is a position above the position through which the slab 3 passes in the hot saw 4 and the upper pressing member 9, and in the width direction restricting member 7, it is the same position as the width guide wall 6 or , And the outer side in the width direction.

And if it is judged that the processing capability in a hot rolling facility is larger than the casting capability in a continuous casting facility, the width of the slab 3 manufactured in the continuous casting facility is changed to a double width, and casting is performed.
Thereby, the double-width slab 3 is manufactured, and the double-width slab 3 is conveyed by the conveyance table 1. When the double-width slab 3 is conveyed, the hot saw 4 is moved to a cutting position (solid line position in FIG. 2) to be in a rotationally driven state. And if it detects that the said slab 3 has been conveyed to the position which opposes the width direction restraint member 7 and the upper pressing member 9, between the width direction restraint members 7 which make a pair will be narrowed, The centering is performed at the center position while suppressing the swing in the width direction. Further, the upper pressing member 9 is lowered, and the slab 3 is pressed from the upper side to restrain the slab 3 from swinging in the vertical direction.

In this way, the slab 3 is transported in a state where the swing of the slab 3 is suppressed from the top, bottom, left and right, and is continuously cut in the longitudinal direction by the hot saw 4 during transport, so that a double-width slab is obtained. 3 is divided into two.
Each of the slabs 3 divided into two is transported by the transport table 1 and sequentially inserted into the heating furnace 10 to be heated.

By performing the cutting with the hot saw 4 at a high temperature of 800 ° C. or higher, the temperature of the slab 3 at the time of charging into the heating furnace 10 can be set to 400 ° C. or higher. That is, it is possible to suppress the deterioration of the fuel consumption rate and the production efficiency. In addition, it is possible to achieve an increase in steelmaking capacity by the above processing.
Further, by constraining the swing of the slab 3 from the left, right, top and bottom when cutting the double-width material, even if the slab 3 is as long as 10 m, for example, the target slab 3 position is surely cut in the longitudinal direction. It becomes possible.

DESCRIPTION OF SYMBOLS 1 Conveying table 2 Conveying roller 3 Slab 4 Hot saw 5 Movement mechanism 6 Width guide wall 7 Width direction restraint member 7a Width restraint part main body 7b Lateral contact roller 8 Movement mechanism 9 Upper pressing member 9a Upper pressing part main body 9b Vertical contact roller DESCRIPTION OF SYMBOLS 10 Heating furnace 11 Waiting yard 12 Moving mechanism 13 Care area C-AREA Cutting position L during conveyance L Conveying line H Slab conveying equipment

Claims (2)

In the slab transport equipment for transporting the slab cast by continuous casting to the heat treatment process by the transport table while maintaining a high temperature ,
To the position of the conveyance table slab is the transport is assumed to pass over the conveyor table at 800 ° C. or higher, it is positionable positioned between conveying rollers in which at least the lower portion is adjacent cast coming is the transported One hot saw capable of cutting a piece into two along the longitudinal direction, a width direction restraining member provided with a pair of a plurality of transport rollers on both sides in the width direction, and an upper pressing member parallel to the transport surface A slab conveyance facility characterized by being provided. In the slab conveying method of conveying the slab cast by continuous casting to the heat treatment step with high temperature ,
When it is judged that the processing capacity in hot rolling is larger than the casting capacity in the continuous casting, the casting is performed by changing the width of the slab in the continuous casting to a double width,
The slab, during transport in the slab is not less than 800 ° C. state, the centering in the widthwise central position by the width direction restraining member, while conveying pressing the slab by the upper pressing member from above, at least a lower Is cut from the upper surface to the lower surface along the longitudinal direction by one hot saw arranged so as to be positioned between adjacent conveying rollers , divided into two, and conveyed to the heat treatment step Single conveying method.

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