JP6466231B2 - Continuous casting apparatus and operation method thereof - Google Patents

Description

  The present invention relates to a continuous casting apparatus and a method for operating the continuous casting apparatus.

An outline of a conventional continuous casting apparatus will be described with reference to FIG. FIG. 14 is the same as FIG. 1 described in Patent Document 1.
As shown in FIG. 14, the continuous casting apparatus 85 includes a ladle 89 that accommodates molten steel 87 refined by secondary refining (not shown) from a converter, and a cradle 91 for placing and turning the ladle 89. A tundish 95 for storing the molten steel 87 injected from the ladle 89 placed on the cradle 91 through the ladle nozzle 93; a mold 97 for molding the molten steel 87 supplied from the tundish 95; And a plurality of support rolls 99 for pulling out and supporting the cast slab 98 formed by 97.

  The tundish 95 has a bottomed box shape, and is provided with an immersion nozzle 96 for pouring the molten steel 87 into the mold 97 at the lower part, temporarily storing the molten steel 87 from the ladle 89 and rectifying the molten steel flow constant. In addition, the multi-strand as shown in FIG. 14 which is an intermediate container which controls the injection flow rate and feeds it into the mold 97 and simultaneously manufactures a plurality of cast pieces 98 also serves as a distribution container.

  In such a continuous casting machine, when one trial of continuous casting is completed, the tundish used for casting is transported to the tundish maintenance yard, and necessary maintenance is performed. The next continuous casting is continued by replacing with a new tundish (see Patent Document 2).

JP 2006-150428 A Japanese Patent No. 2856075

  Even if the number of strands is one or the plurality of strands shown in FIG. 14, if there are many types of slabs to be manufactured, the mold, top zone segment, It is necessary to replace or reconfigure the secondary cooling spray and many other devices.

For this reason, in actual operation, casting is once ended and the respective devices are replaced in accordance with the size of the next slab, so that the substantial operation time is shortened and the production volume is reduced.
In this case, the upstream equipment (for example, a converter, an electric furnace, etc.) for supplying molten steel also needs to temporarily stop operation, which hinders smooth continuation of operation. Furthermore, when there is molten steel that has already been output from the upstream equipment, it is necessary to keep the temperature so that the temperature does not decrease. For example, energy is wasted.

As a method for solving such a problem, two continuous casting facilities are installed, and equipment is replaced in accordance with a new slab size to be changed at the other continuous casting facility during operation at one continuous casting facility. It is possible to prepare and start casting a new size slab when the preparation is completed.
However, in this case, in each continuous casting facility, a ladle turret that rotates the ladle, two tundishes that receive molten steel injection from the ladle turret, and a tundish that moves the two tundishes Each tundish car is required, and many facilities have to be installed in duplicate in two continuous casting facilities, resulting in an increase in equipment costs.

  Moreover, since molten steel is poured into the tundish from separate ladles placed on separate ladle turrets at each continuous casting facility, the ladle cannot be moved between each continuous casting facility, for example, one side Even if the production of the required amount of slab is completed at the continuous casting facility, it is necessary to continue making the slab until all the molten steel remaining in the ladle is discharged, which wastefully manufactures. There is also a problem.

  The present invention has been made to solve such a problem, and can suppress wasteful consumption of energy, and can efficiently produce a small-lot slab without producing a waste slab. An object of the present invention is to provide a continuous casting apparatus that can be used and a method for operating the continuous casting apparatus.

The first aspect of the present invention is:
A plurality of tundishes separated from each other;
A first mold to which molten steel is supplied from a first tundish, which is a tundish arranged at a first casting position among the plurality of tundishes, and a slab drawn from the first mold are supported and cooled. A first casting line including a first strand configured to be continuously delivered while
A second mold to which molten steel is supplied from a second tundish that is a tundish disposed at a second casting position different from the first casting position among the plurality of tundishes, and is drawn from the second mold. A second casting line including a second strand configured to support the slab and continuously deliver while cooling;
It is possible to inject the molten steel into the first tundish from the one receiving position for receiving the ladle containing the molten steel from the outside, and the first injecting position where the molten steel can be injected into the first tundish. It is a continuous casting apparatus provided with the ladle moving apparatus comprised so that the said ladle could be moved to both a 2nd injection | pouring position.

  In the continuous casting apparatus according to the first aspect, the ladle moving device may be configured to move the ladle between the first pouring position and the second pouring position.

In the continuous casting apparatus according to the first aspect, the ladle moving device includes two arms that are capable of turning independently of each other and that can move while holding one ladle. It may be a turret.
Alternatively, the ladle moving device can be arranged with a plurality of ladles arranged in a row, and is configured to move in parallel with the arrangement direction of the ladles, and on the ladle carriage Each of the ladles is laid in parallel to a straight line connecting the first casting position and the second casting position so that the ladle can be moved to both the first casting position and the second casting position. A ladle trolley track.
Alternatively, the ladle moving device is capable of placing a first ladle moving platform track laid between the receiving position and the first pouring position and one ladle, and the first ladle A first ladle moving table moving on the moving table track, a second ladle moving table track laid between the receiving position and the second pouring position, and one ladle can be placed. A second ladle moving table that moves on the second ladle moving table track may be provided.

In the continuous casting apparatus of the first aspect,
The first casting line includes a plurality of the first molds and the same number of the first strands as the number of the first molds;
The second casting line includes the same number of second molds as the number of first molds and the same number of second strands as the number of first molds ;
The plurality of tundish may have the same number of molten steel outlet holes as the number of the first molds.

  In the continuous casting apparatus of the first aspect, the first tank is configured such that the first tundish and the second tundish can be independently transported to the first casting position and the second casting position, respectively. A dish car and a second tundish car may further be provided. The first tundish car and the second tundish car provided in common to the first casting line and the second casting line, the first tundish car and the second tundish car. You may further provide the common track | truck which enables a tundish to move to both the said 1st casting position and the said 2nd casting position at least.

A second aspect of the present invention is an operation method of the continuous casting apparatus according to the first aspect,
Starting preparatory work for the second casting line while casting in the first casting line;
Continuing the casting in the first casting line during the preparatory work of the second casting line;
Starting casting at the second casting line after the preparatory work for the second casting line is completed.

In the operation method of the continuous casting apparatus of the second aspect,
When the injection of the molten steel necessary for one of the first tundish and the second tundish is completed, in the ladle injecting the molten steel into the one tundish. Stopping the injection of molten steel from the ladle into the one tundish in the presence of residual molten steel;
The ladle moving device moves the ladle that has poured molten steel into the one tundish to the pouring position where molten steel can be poured into the other tundish of the first pouring position and the second pouring position. Moving with
It may further include performing casting using the residual molten steel in a casting line including the other tundish of the first casting line and the second casting line.

According to the present invention, it is not necessary to stop the operation even when the slab size is changed, and the operation in which wasteful consumption of energy due to the stop of the upstream equipment is suppressed, such as a ladle moving device and a tundish car It can be realized without duplication of equipment, and cost can be reduced.
In addition, for the production of the slab size before the size change, the molten steel injection from the ladle to the tundish on one casting line is stopped when the production of the required amount of slab is completed, and it remains in the ladle. Since the molten steel can be used for casting in the other casting line, unnecessary production is not required, and in particular, small lot production can be performed efficiently.

It is explanatory drawing of the continuous casting apparatus which concerns on embodiment of this invention. It is a perspective view of the ladle moving apparatus used for the continuous casting apparatus shown in FIG. It is a top view of the ladle moving apparatus shown in FIG. It is a disassembled perspective view of the ladle moving apparatus shown in FIG. It is explanatory drawing of the ladle used for the continuous casting apparatus which concerns on embodiment of this invention. It is explanatory drawing of the continuous casting apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing of the continuous casting apparatus which concerns on Embodiment 3 of this invention. It is explanatory drawing of the continuous casting apparatus which concerns on Embodiment 4 of this invention. It is a top view of the ladle moving apparatus used for the continuous casting apparatus shown in FIG. It is sectional drawing of the ladle moving apparatus used for the continuous casting apparatus shown in FIG. It is operation | movement explanatory drawing of the continuous casting apparatus which concerns on Embodiment 4 shown in FIG. 8 (the 1). It is operation | movement explanatory drawing of the continuous casting apparatus which concerns on Embodiment 4 shown in FIG. 8 (the 2). It is explanatory drawing of the continuous casting apparatus which concerns on Embodiment 5 of this invention. It is explanatory drawing of the conventional continuous casting apparatus.

[Embodiment 1]
As shown in FIG. 1, the continuous casting apparatus 1 according to the present embodiment is a tundish between the first casting line 3, the second casting line 5, and the first casting line 3 and the second casting line 5. A tundish car (first tundish car 29, second tundish car 31) that moves (first tundish 9, second tundish 19) and ladle moving device 7 that moves ladle 6 are provided. ing.
Hereinafter, each configuration will be described in detail.

<First casting line>
The first casting line 3 is drawn from the first molds 11 and 15 to which the molten steel is supplied from the first tundish 9 that is a tundish disposed at the first casting position C1, and the first molds 11 and 15. 1st strands 13 and 17 comprised so that it may send out continuously, supporting a slab and cooling.
The first tundish 9 is provided with two molten steel outlet holes that are the same number as the first molds 11 and 15, that is, the same number as the first strands 13 and 17 included in the first casting line 3. The molten steel can be injected into the two first molds 11 and 15.

<Second casting line>
The second casting line 5 includes second molds 21 and 25 to which molten steel is supplied from a second tundish 19 which is a tundish disposed at the second casting position C2, and is drawn from the second molds 21 and 25. The second strands 23 and 27 are configured to continuously feed the cast slab while cooling it.
Further, the second tundish 19 is provided with the same number of molten steel outlet holes as the number of the first molds 11 and 15, that is, two molten steel outlet holes can be injected into the two second molds 21 and 25. It has become.

  In the present invention, the casting mold and the corresponding strand set included in each casting line may be one, but the casting mold and the corresponding strand set in each casting line as in the present embodiment. By providing two, it is possible not only to increase the production amount of slabs per unit time, but also to produce slabs of different sizes at the same time using only one casting line. Can be done efficiently.

<Tundish car>
In the present embodiment, the first tundish car 29 and the first tundish car 29 are configured so that the first tundish 9 and the second tundish 19 can be independently transported to the first casting position C1 and the second casting position C2, respectively. Two tundish cars 31 are provided.
In addition, a common track 32 of the first tundish car 29 and the second tundish car 31 provided in common to the first casting line 3 and the second casting line 5, the first tundish 9 and the second tundish car 31. A common track 32 is provided that allows the tundish 19 to move at least to both the first casting position C1 and the second casting position C2.

<Ladle moving device>
The ladle moving device 7 is capable of injecting molten steel from one receiving position P1 that receives the ladle 6 containing molten steel from the outside into the first tundish 9 disposed at the first casting position C1. The ladle 6 is configured to be movable at both the first pouring position P2 and the second pouring position P3 where the molten steel can be poured into the second tundish 19 disposed at the second pouring position C2.

Although the ladle moving device 7 can take various forms, in the present embodiment, as shown in FIGS. 2 to 4, the ladle moving device 7 can pivot independently of each other and each holds one ladle 6. Thus, an independent turning type turret having two arms configured to be movable is used.
Specifically, the ladle moving device 7 of the present embodiment is attached to the cylindrical base frame 33, the annular lower bearing 35 attached to the base frame 33, and the lower bearing 35 so as to be pivotable. The lower turning arm 37, an annular upper bearing 39 provided on the annular base 43 of the lower turning arm 37, and an upper turning arm 41 that is turnably mounted on the upper bearing 39.

The lower turning arm 37 includes an annular base portion 43 that turns and an arm portion 45 that extends from the base portion 43 in a substantially U shape. A ladle elevating device 47 that moves up and down by placing the ladle 6 is provided inside the arm portion 45. Further, the arm portion 45 is provided with a ladle cover handling device 49 for handling a ladle cover 48 placed on the upper end portion of the ladle 6.
Similarly to the lower turning arm 37, the upper turning arm 41 also includes an annular base 51 that turns and an arm portion 53 that extends from the base 51 in a substantially U shape. A ladle raising and lowering device 55 that moves up and down by placing the ladle 6 is provided inside the arm portion 53. The arm portion 53 is provided with a ladle cover handling device 57 for handling a ladle cover 48 placed on the upper end of the ladle 6.

The upper swivel arm 41 and the lower swivel arm 37 can be swung independently, and the ladle 6 placed on the ladle lifting devices 47 and 55 is received from the outside with the ladle 6 filled with molten steel. From one receiving position P1, both the first injection position P2 where molten steel can be injected into the first tundish 9 and the second injection position P3 where molten steel can be injected into the second tundish 19 Each is movable.
Moreover, as shown in FIG. 5, the ladle nozzle 59 provided in the lower part of the ladle 6 is closed to stop the outflow of the molten steel, thereby moving the ladle 6 from the first injection position P2 to the second injection position P3. Alternatively, it can move from the second injection position P3 to the first injection position P2.

In the present embodiment, the receiving position P1 is disposed on the center line 61 between the first casting line 3 and the second casting line 5, and the first injection position P2 and the second injection position P3 are the center line 61. Is set to be a line target.
With this arrangement relationship, the turning angle is the same when the ladle 6 received at the receiving position P1 is moved to either the first injection position P2 or the second injection position P3. The relative position of the discharge nozzle of the ladle 6 is the same as the tundish (the first tundish 9 and the second tundish 19) arranged in the ladle. Therefore, when receiving the ladle 6 containing the molten steel suspended and moved from outside by the crane at the receiving position P1, the direction of the ladle 6 is the same regardless of the movement position. Therefore, the ladle 6 received by either the upper turning arm 41 or the lower turning arm 37 can be cast as it is regardless of whether the ladle 6 moves to the first injection position P2 or the second injection position P3. .
Moreover, in this Embodiment, since the ladle 6 can be moved between the 1st pouring position P2 and the 2nd pouring position P3 only by the ladle moving apparatus 7, the 1st pouring position P2 and the 2nd When moving the ladle 6 to and from the pouring position P3, there is no need to perform an operation such as returning the ladle 6 to the receiving position P1 and replacing it with a crane.

Next, an operation method in the case of performing continuous casting of a slab using the continuous casting apparatus 1 of the present embodiment configured as described above will be described.
Since the continuous casting apparatus 1 of this Embodiment can operate simultaneously with the 1st casting line 3 and the 2nd casting line 5, this point is demonstrated first.

<Simultaneous operation of the first and second casting lines>
When the 1st casting line 3 and the 2nd casting line 5 are operated simultaneously, the ladle moving apparatus 7 arrange | positions the ladle 6 in each of the 1st pouring position P2 and the 2nd pouring position P3, and performs casting. For example, when the ladle 6 arranged at the first pouring position P2 becomes empty, the ladle moving device 7 moves the ladle 6 to the receiving position P1 and carries it out by a crane or the like, and a new ladle in which molten steel is put. 6 is received, the ladle 6 is moved again to the first pouring position P2, and casting is continued. At this time, the receiving position P1 is set to a position different from the first pouring position P2 and the second pouring position P3, and the two ladles 6 can be moved independently. The first casting line 3 and the second casting line 5 can be operated simultaneously without affecting the inner casting line.

<Changing slab size>
As an example, A size and B size slabs are respectively formed in the two first strands 13 and 17 of the first casting line 3, and C size and D size are respectively set in the second strands 23 and 27 of the second casting line 5. The case where the slab casted by the second strands 23 and 27 of the second casting line 5 is resized to the E size and the F size, respectively, in a state where the slab is being cast will be described.

During simultaneous operation in the first casting line 3 and the second casting line 5, the molten steel that only produces a predetermined amount of C and D size slabs from the ladle 6 is transferred from the ladle 6 to the second tank. When injected into the dish 19, the ladle nozzle 59 of the ladle 6 is closed to stop the molten steel injection into the second tundish 19.
The ladle 6 that is disposed at the second pouring position P3 of the second casting line 5 and in which molten steel remains is made to stand by on the spot, and the ladle 6 that is disposed at the first pouring position P2 of the first casting line 3. Is moved from the first injection position P2 to the receiving position P1. At the receiving position P1, the empty ladle 6 is replaced with a ladle 6 containing molten steel, and the ladle 6 that has been waiting at the second pouring position P3 is moved to the first pouring position P2. The casting in the first casting line 3 is continued. After that, when the ladle 6 disposed at the first injection position P2 becomes empty, the arm for holding the ladle 6 is rotated counterclockwise to change to another standby position (for example, the receiving position P1 and the second injection position P3). The ladle 6 containing the molten steel received at the receiving position P1 is moved to the first pouring position P2 and casting in the first casting line 3 is continued.

When the ladle 6 is arranged in this way and the second tundish 19 is emptied (when the production of C and D slabs is completed at the second strands 23 and 27 of the second casting line 5, respectively). In the second casting line 5, preparation work for manufacturing E and F size slabs is started.
The preparatory work includes a mold size changing work and a recombination work of the second strands 23 and 27. In addition, the tundish used in the second casting line 5 is preheated in preparation for the start of operation of the second casting line 5. By keeping the other arm different from the one arm used for the operation in the first casting line 3 in the standby position as described above, the operation in the first casting line 3 can be performed without delay. The preheating device can be arranged at the second casting position C2 to perform the preheating operation of the second tundish 19 at the second casting position C2, so that the required space is small and space saving is realized.

  Moreover, since the common track 32 of the 1st tundish car 29 and the 2nd tundish car 31 provided in common with the 1st casting line 3 and the 2nd casting line 5 is provided, it is in the 2nd casting position C2. The tundish car on which the preheated tundish is placed can be moved on the common track 32 and arranged at the first casting position C1. That is, the tundish car can be shared between the two casting lines.

  Furthermore, the first tundish car 29 and the second tundish car configured to be able to independently transport the first tundish 9 and the second tundish 19 to the independent first casting position C1 and the second casting position C2, respectively. 31 so that the second tundish 19 can be taken out while continuing casting in the first casting line 3 and a new tundish can be preheated, so the casting is resumed in the second casting line 5. In addition to being able to use the preheated tundish as the second tundish 19, the preheated tundish can be replaced with the first tundish 9 of the first casting line 3 if necessary. It is possible to increase the degree of freedom of operation, such as being able to operate continuously for a long time in line 3.

  Thus, in the present embodiment, the preparatory work for the second casting line 5 is performed during casting in the first casting line 3, and after the preparatory work for the second casting line 5 is completed, the second casting line 5 is completed. By starting casting at the casting line 5, it is not necessary to stop casting even when the slab size is changed. Therefore, when changing the slab size, it is not necessary to stop the upstream equipment such as the converter, and wasteful consumption of energy can be suppressed.

  Further, in the present embodiment, the injection of an amount of molten steel necessary for one of the first tundish 9 and the second tundish 19 (the second tundish 19 in the present embodiment) is completed. At that time, the injection of molten steel from the ladle 6 to the second tundish 19 is stopped with the residual molten steel existing in the ladle 6 that is injecting molten steel into the second tundish 19, and the second tundish 19 It is possible to inject the molten steel into the other tundish (the first tundish 9 in this embodiment) of the ladle 6 that has been infused with the molten steel into the first pouring position P2 and the second pouring position P3. The ladle moving device 7 moves to the pouring position (the first pouring position P2 in this embodiment), and the casting line (the main one) including the first tundish 9 among the first casting line 3 and the second casting line 5. Implementation The state performs cast using the residual molten steel in the first casting line 3). More specifically, before the start of the preparatory work for the second casting line 5, when the injection of the amount of molten steel necessary for the second tundish 19 in the second casting line 5 is completed, the second injection position P3 is reached. The injection of molten steel from the ladle 6 to the second tundish 19 is stopped in the state where the residual molten steel exists in the arranged ladle 6, and the ladle 6 arranged at the second pouring position P3 is used as the first pouring position. The residual molten steel is used for casting in the first casting line 3 by moving to the P2 by the ladle moving device 7. Thereby, it becomes unnecessary to manufacture an unnecessary slab, and small lot production can be performed particularly efficiently.

  In addition, the ladle moving device 7 may be a single unit, and in this embodiment, the tundish car runs on the common track 32, so that the ladle moving device, the tundish car and the like are overlapped. This can be avoided and the cost can be reduced.

  In addition, in said operation method, although manufacture of the slab of C and D size in the 2nd casting line 5 is completed when the molten steel remains in the ladle 6, the ladle 6 becomes empty. Production of C and D size slabs may be continued until the ladle 6 is emptied and preparation for size change may be started.

[Embodiment 2]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is an explanatory diagram of the continuous casting apparatus 63 according to Embodiment 2 of the present invention. The difference between the continuous casting device 63 according to the second embodiment and the first embodiment is that the ladle moving device 65 has integral swivel arms 66 having ladle lifting devices at both ends, and other configurations. The effects obtained thereby are the same as in the first embodiment.

  Similarly to the first embodiment, the ladle moving device 65 also moves from the one receiving position P1 for receiving the ladle 6 containing molten steel from the outside to the first tundish 9 disposed at the first pouring position C1. The ladle 6 at both the first pouring position P2 where molten steel can be poured and the second pouring position P3 where molten steel can be poured into the second tundish 19 arranged at the second casting position C2. Can be moved. Also in the present embodiment, the ladle 6 can be moved between the first injection position P2 and the second injection position P3 by the ladle moving device 65 alone, and the first injection position P2 and the second injection position P2 When moving the ladle 6 to and from the pouring position P3, there is no need to perform an operation such as returning the ladle 6 to the receiving position P1 and replacing it with a crane.

An example of the operation method in the present embodiment is outlined as follows.
During casting of a slab of a predetermined size in the first casting line 3, a mold or the like necessary for casting a slab of another size is prepared in the second casting line 5. As soon as casting is completed, casting in the second casting line 5 is started.

  Thus, also in the present embodiment, the amount of molten steel necessary for one of the first tundish 9 and the second tundish 19 (the first tundish 9 in the present embodiment). When the pouring is completed, the pouring of molten steel from the ladle 6 to the first tundish 9 is stopped in a state where there is residual molten steel in the ladle 6 that is pouring molten steel into the first tundish 9, Injecting molten steel into the other tundish (the second tundish 19 in the present embodiment) of the ladle 6 that has poured molten steel into one tundish 9 in the first pouring position P2 and the second pouring position P3. Of the first casting line 3 and the second casting line 5 including the second tundish 19 is moved by the ladle moving device 65 to the pouring position (the second pouring position P3 in the present embodiment). line In this embodiment performs cast using the residual molten steel in the second casting line 5). More specifically, in the manufacture of the slab size before the size change, when the manufacture of the required amount of slab is completed in the first casting line 3, the ladle 6 disposed at the first injection position P2 is completed. The molten steel injection from the ladle 6 to the first tundish 9 can be stopped in the state where the residual molten steel exists, and the residual molten steel can be used for casting in another casting line, in this example, the second casting line 5. Therefore, it is not necessary to manufacture unnecessary slabs, and particularly small lot production can be performed efficiently.

  Also in this embodiment, the ladle moving device 65 may be one, and the tundish cars (the first tundish car 29 and the second tundish car 31) run on the common track 32. Thus, as in the first embodiment, duplication of equipment can be avoided and cost reduction is also possible.

  However, since the swivel arm 66 is integrated, as shown in FIG. 6, when the ladle 6 containing molten steel is at the first injection position P2, the other end of the swivel arm is placed at the receiving position P1 or the second injection position P3. Cannot be placed.

  Also in the present embodiment, as shown in FIG. 6, since there is a space for arranging the tundish at the second casting position C2, when the ladle 6 is arranged at the first pouring position P2, the second Tundish preheating can be performed at the casting position C2, and space saving can be achieved.

[Embodiment 3]
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 7 is an explanatory diagram of a continuous casting apparatus 67 according to Embodiment 3 of the present invention. Similar to the second embodiment, the continuous casting device 67 according to the third embodiment is different from the first embodiment in that the swivel arm 68 uses an integrated ladle moving device 69. The configuration and the effects obtained thereby are the same as in the first embodiment.
The third embodiment is different from the second embodiment in that one receiving position P1 for receiving the ladle 6 containing molten steel from the outside is the same position as the first injection position P2 or the second injection position P3. Yes. More specifically, as shown in FIG. 7, when casting is performed in the first casting line 3, the receiving position P1 is the same position as the second injection position P3. Further, when casting is performed in the second casting line 5, the receiving position P1 is the same position as the first injection position P2.

  In the case of the third embodiment, as in the case of the first and second embodiments, the ladle 6 is moved between the first injection position P2 and the second injection position P3 by the ladle moving device 69 alone. It is possible, and when the ladle 6 is moved between the first injection position P2 and the second injection position P3, it is necessary to return the ladle 6 to the receiving position P1 and replace it with a crane. There is no. Therefore, for example, while casting a slab of a predetermined size in the first casting line 3, a mold or the like necessary for casting a slab of another size is prepared in the second casting line 5, and the first casting line is prepared. When the casting at 3 is completed, the casting at the second casting line 5 can be started immediately.

  Thus, also in the present embodiment, the amount of molten steel necessary for one of the first tundish 9 and the second tundish 19 (the first tundish 9 in the present embodiment). When the pouring is completed, the pouring of molten steel from the ladle 6 to the first tundish 9 is stopped in a state where there is residual molten steel in the ladle 6 that is pouring molten steel into the first tundish 9, Injecting molten steel into the other tundish (the second tundish 19 in the present embodiment) of the ladle 6 that has poured molten steel into one tundish 9 in the first pouring position P2 and the second pouring position P3. Of the first casting line 3 and the second casting line 5 including the second tundish 19 is moved by the ladle moving device 65 to the pouring position (the second pouring position P3 in the present embodiment). line In this embodiment performs cast using the residual molten steel in the second casting line 5). More specifically, in the manufacture of the slab size before the size change, when the manufacture of the required amount of slab is completed in the first casting line 3, the ladle 6 disposed at the first injection position P2 is completed. The molten steel injection from the ladle 6 to the first tundish 9 can be stopped in the state where the residual molten steel exists, and the residual molten steel can be used for casting in another casting line, in this example, the second casting line 5. Therefore, it is not necessary to manufacture unnecessary slabs, and particularly small lot production can be performed efficiently.

  In the case of the present embodiment, the same position as the first injection position P2 is the receiving position P1, and the same position as the second injection position P3 is the receiving position P1, and is placed on the swivel arm. The position of the ladle nozzle 59 of the ladle 6 is a position different by 180 degrees. Therefore, when the receiving position P1 is changed between the first injection position P2 and the second injection position P3, the position where the ladle 6 is placed by the ground turning device before the ladle 6 is lifted by the crane. It is necessary to adjust the direction of the ladle 6 in the direction corresponding to the (receiving position).

  Unlike the other embodiments, only in the third embodiment, the first tundish car 29 and the second tundish car 31 that are provided in common in the first casting line 3 and the second casting line 5 are used. However, the preheating of the tundish may be performed outside the first casting position C1 and the second casting position C2.

[Embodiment 4]
Next, Embodiment 3 of the present invention will be described with reference to FIGS. FIG. 8 is an explanatory view of a continuous casting apparatus 71 according to Embodiment 4 of the present invention. The continuous casting apparatus 71 of the fourth embodiment is different from the first embodiment in that a plurality of ladles 6 (two in the present embodiment) are used as the ladle moving apparatus 73 as shown in FIG. A ladle trolley 74 that can be placed in a line and moves parallel to the arrangement direction of the ladle 6 and a plurality of ladles on the ladle trolley 74 are all first cast. A ladle carriage track 76 laid parallel to a straight line connecting the first casting position C1 and the second casting position C2 so as to be movable to both the position C1 and the second casting position C2. Other configurations and effects obtained thereby are the same as those of the first embodiment. Specifically, the ladle trolley 74 has two ladle placing portions 75 as shown in FIGS. 9 and 10, and the ladle 6 can be placed along the track.

  In FIG. 8, the position to which the ladle moving device 73 (the ladle cart 74) can be moved is indicated by a two-dot chain line. In the present embodiment, since the crane for transporting the ladle 6 to the receiving position P1 is installed so as to be movable in parallel with the common track 32, the ladle moving device 73 moves on the common track 32. Even so, the ladle 6 can be placed on the ladle cart 74. Therefore, as shown in FIG. 11, when the ladle is placed at the first pouring position P2 and casting is performed, the position adjacent to the ladle cart 74 of the ladle 6 at the first pouring position P2 is set as the receiving position P1. As shown in FIG. 12, when the ladle 6 is placed at the second pouring position P3 and casting is performed, the position next to the ladle cart 74 of the ladle 6 at the second pouring position P3 is the receiving position. P1 can be set. As described above, in the present embodiment, the position of the receiving position P1 can be changed. Regardless of which position is set as the receiving position, the ladle moving device 73 changes from the one receiving position P1 to the first injection position P2. And the ladle 6 can be moved to both the second injection position P3.

  Also in this embodiment, the ladle 6 can be moved between the first injection position P2 and the second injection position P3 by the ladle moving device 73 alone, and the first injection position P2 and the second injection position P2 When moving the ladle 6 to and from the pouring position P3, there is no need to perform an operation such as returning the ladle 6 to the receiving position P1 and replacing it with a crane. Therefore, when the second casting line 5 is prepared when casting is performed in the first casting line 3, the preparation of the second casting line 5 is completed, and the necessary casting in the first casting line 3 is completed. Then, the pouring of the molten steel from the ladle 6 at the first pouring position P2 to the first tundish 9 is stopped, and the ladle 6 where the molten steel remains is moved to the second pouring position P3 by the ladle moving device 73. The casting in the second casting line 5 can be started immediately (see FIG. 12).

  Thus, also in the present embodiment, the amount of molten steel necessary for one of the first tundish 9 and the second tundish 19 (the first tundish 9 in the present embodiment). When the pouring is completed, the pouring of molten steel from the ladle 6 to the first tundish 9 is stopped in a state where there is residual molten steel in the ladle 6 that is pouring molten steel into the first tundish 9, Injecting molten steel into the other tundish (the second tundish 19 in the present embodiment) of the ladle 6 that has poured molten steel into one tundish 9 in the first pouring position P2 and the second pouring position P3. Of the first casting line 3 and the second casting line 5 including the second tundish 19 is moved to the pouring position (the second pouring position P3 in this embodiment) by which the ladle moves. line In this embodiment performs cast using the residual molten steel in the second casting line 5). More specifically, in the manufacture of the slab size before the size change, when the manufacture of the required amount of slab is completed in the first casting line 3, the ladle 6 disposed at the first injection position P2 is completed. The molten steel injection from the ladle 6 to the first tundish 9 can be stopped in the state where the residual molten steel exists, and the residual molten steel can be used for casting in another casting line, in this example, the second casting line 5. Therefore, it is not necessary to manufacture unnecessary slabs, and particularly small lot production can be performed efficiently.

Further, in the present embodiment, the receiving position P1 is on the ladle carriage 74 that moves on the ladle carriage track 76 provided between the first casting position C1 and the second casting position C2. When placing the ladle 6 on the moving device 73 (ladder carriage 74), it is not necessary to consider the direction of the ladle 6.
In addition, what is necessary is just to make it provide the preheating position of a tundish car in the both ends of the range which the ladle moving apparatus 73 moves, as shown in FIG.

[Embodiment 5]
Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 13 is an explanatory diagram of a continuous casting apparatus 77 according to Embodiment 5 of the present invention. The continuous casting apparatus 77 according to the fifth embodiment is different from the first embodiment in that a ladle moving apparatus 79 is laid between the receiving position P1 and the first injection position P2 as shown in FIG. The first ladle moving table track 82 and one ladle 6 can be placed, the first ladle moving table 81 moving on the first ladle moving table track 82, the receiving position P1 and the second The second ladle moving stand track 84 laid between the pouring position P3 and the second ladle moving stand that can place one ladle 6 and moves on the second ladle moving stand track 84. 83. Other configurations and effects obtained thereby are the same as those of the first embodiment. Therefore, the ladle moving device 79 of the present embodiment also has a ladle from one receiving position P1 for receiving the ladle 6 containing molten steel from the outside to both the first pouring position P2 and the second pouring position P3. 6 is configured to be movable.

  In the present embodiment, since the ladle moving table (the first ladle moving table 81, the second ladle moving table 83) is movable independently, the first casting line is the same as in the first embodiment. 3 and the second casting line 5 can be operated simultaneously. This point will be described in detail below.

<Simultaneous operation of the first and second casting lines>
When the first casting line 3 and the second casting line 5 are operated simultaneously, the ladle 6 is arranged at the first pouring position P2 by the first ladle moving table 81 and another ladle is moved by the second ladle moving table 83. The pan 6 is placed at the second pouring position P3 and casting is performed in each casting line.
And, for example, when the ladle 6 arranged at the first pouring position P2 becomes empty, the ladle 6 is moved to the receiving position P1 by the first ladle moving stand 81 and is carried out by a crane or the like and molten steel is put therein. A new ladle 6 is received, the ladle 6 is moved again to the first pouring position P2, and casting is continued. At this time, as in the first embodiment, the receiving position P1 is set to a position different from the first injection position P2 and the second injection position P3, and the two ladles 6 can be moved independently. When the ladle 6 is moved, the first casting line 3 and the second casting line 5 can be operated simultaneously without affecting the casting line during casting.

<Changing slab size>
In the present embodiment, unlike the other embodiments, the ladle 6 cannot be moved between the first injection position P2 and the second injection position P3 by the ladle moving device 79 alone. When the ladle 6 is moved between the first injection position P2 and the second injection position P3, it is necessary to return the ladle once to the receiving position P1 and replace it with a crane. Therefore, in the present embodiment, the ladle 6 disposed at the second injection position P3 in the second casting line 5 is emptied during simultaneous casting in the first casting line 3 and the second casting line 5. At the time (with no residual molten steel in the ladle disposed at the second pouring position P3), the casting in the second casting line 5 is stopped, the second strand 23 of the second casting line 5, 27, it is preferable to start preparatory work for the production of E and F size slabs, respectively.

  Thereafter, when the preparatory work for the second casting line 5 is completed, casting in the second casting line 5 is resumed, but the casting is continued in the first casting line 3 during the preparatory work in the second casting line 5. doing. That is, in the present embodiment, casting is not stopped even when the slab size is changed, so that upstream equipment (for example, a converter, an electric furnace, etc.) that supplies molten steel is also used when changing the slab size. ) Operation is not required to be paused, and wasteful consumption of energy can be suppressed.

  Although the present invention has been described using the embodiments, the present invention is not limited to the configurations of these embodiments. The scope of the present invention is determined based on the description of the appended claims, and all configurations in which the components are omitted, modified, or improved within the scope are included in the present invention.

P1 receiving position P2 first pouring position P3 second pouring position C1 first pouring position C2 second pouring position 1 continuous casting apparatus (Embodiment 1)
3 First Casting Line 5 Second Casting Line 6 Ladle 7 Ladle Moving Device (Embodiment 1)
9 First Tundish 11 First Template 13 First Strand 15 First Template 17 First Strand 19 Second Tundish 21 Second Template 23 Second Strand 25 Second Template 27 Second Strand 29 First Tan Dish car 31 Second tundish car 32 Common track 33 Base frame 35 Lower bearing 37 Lower turning arm 39 Upper bearing 41 Upper turning arm 43 Base 45 Arm part 47 Ladle lifting device 48 Ladle cover 49 Ladle cover handling device 51 Base 53 Arm portion 55 Ladle lifting device 57 Ladle cover handling device 59 Ladle nozzle 61 Center line 63 Continuous casting device (Embodiment 2)
65 Ladle moving device 66 Turning arm 67 Continuous casting device (Embodiment 3)
68 Turning arm 69 Ladle moving device 71 Continuous casting device (Embodiment 4)
73 Ladle moving device 74 Ladle trolley 75 Ladle placing section 76 Ladle trolley track 77 Continuous casting device (Embodiment 5)
79 Ladle moving device 81 First ladle moving table 82 First ladle moving table track 83 Second ladle moving table 84 Second ladle moving table track 85 Continuous casting device (conventional example)
87 Molten steel 89 Ladle 91 Receptacle 93 Ladle nozzle 95 Tundish 96 Immersion nozzle 97 Mold 98 Slab 99 Support roll

Claims (10)

A plurality of tundishes separated from each other;
A first mold to which molten steel is supplied from a first tundish, which is a tundish arranged at a first casting position among the plurality of tundishes, and a slab drawn from the first mold are supported and cooled. A first casting line including a first strand configured to be continuously delivered while
A second mold to which molten steel is supplied from a second tundish that is a tundish disposed at a second casting position different from the first casting position among the plurality of tundishes, and is drawn from the second mold. A second casting line including a second strand configured to support the slab and continuously deliver while cooling;
It is possible to inject the molten steel into the first tundish from the one receiving position for receiving the ladle containing the molten steel from the outside, and the first injecting position where the molten steel can be injected into the first tundish. A continuous casting apparatus comprising: a ladle moving device configured to move the ladle to both the second pouring position.   The continuous casting apparatus according to claim 1, wherein the ladle moving device is configured to be able to move the ladle between the first pouring position and the second pouring position.   The continuous ladle according to claim 1 or 2, wherein the ladle moving device is a turret including two arms that are capable of turning independently of each other and that are configured to be movable while holding one ladle. Casting equipment.   The ladle moving device is capable of placing a plurality of ladles in a row, and is configured to move in parallel with an arrangement direction of the ladles, and the ladle trolley is arranged on the ladle trolley. Each of the plurality of ladles is laid in parallel to a straight line connecting the first casting position and the second casting position so that all of the ladle can be moved to both the first casting position and the second casting position. The continuous casting apparatus according to claim 1, comprising a ladle bogie track.   The ladle moving device is capable of placing a first ladle moving table track laid between the receiving position and the first pouring position and one ladle, and the first ladle moving table. A first ladle moving table that moves on the track; a second ladle moving table track that is laid between the receiving position and the second pouring position; and one ladle can be placed; The continuous casting apparatus according to claim 1, further comprising a second ladle moving table that moves on a second ladle moving table track. The first casting line includes a plurality of the first molds and the same number of the first strands as the number of the first molds;
The second casting line includes the same number of second molds as the number of first molds and the same number of second strands as the number of first molds ;
The continuous casting apparatus according to any one of claims 1 to 5, wherein the plurality of tundishes are provided with the same number of molten steel outlet holes as the number of the first molds.   A first tundish car and a second tundish car configured to be able to transport the first tundish and the second tundish independently to the first casting position and the second casting position, respectively. The continuous casting apparatus according to any one of claims 1 to 6.   A common track of the first tundish car and the second tundish car provided in common to the first casting line and the second casting line, wherein the first tundish and the second tundish The continuous casting apparatus according to claim 7, further comprising a common track that can move at least to both the first casting position and the second casting position. An operation method of the continuous casting apparatus according to any one of claims 1 to 8,
Starting preparatory work for the second casting line while casting in the first casting line;
Continuing the casting in the first casting line during the preparatory work of the second casting line;
After the preparatory work for the second casting line is completed, starting the casting in the second casting line. When the injection of the molten steel necessary for one of the first tundish and the second tundish is completed, in the ladle injecting the molten steel into the one tundish. Stopping the injection of molten steel from the ladle into the one tundish in the presence of residual molten steel;
The ladle moving device moves the ladle that has poured molten steel into the one tundish to the pouring position where molten steel can be poured into the other tundish of the first pouring position and the second pouring position. Moving with
The continuous casting apparatus according to claim 9, further comprising: performing casting using the residual molten steel in a casting line including the other tundish of the first casting line and the second casting line. Operation method.