JPH084887B2 - High temperature cast carrier - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a high-temperature slab conveying apparatus, and particularly to a high-temperature slab that is applied to a thin slab continuous casting facility and is equipped with a heat dissipation prevention device to enhance the heat retention capacity. The present invention relates to a carrier device.

[Prior Art] A conventional conveying table structure in a conveying device for high-temperature slabs is provided with an insulating cover on the upper side of the conveying table and on the lower side thereof, as disclosed in, for example, JP-A-57-127310. The heat insulating board arranged between the rolls is provided to cover the periphery of the cast slab to be conveyed, so that the heat release from the slab is suppressed and the temperature is maintained. On the other hand, as a roll structure, for example, as disclosed in Japanese Utility Model Publication No. 61-1926, by forming a concave groove on the circumferential surface of the roll and filling a heat insulating material in the concave groove, heat conduction There is a structure in which the heat loss is reduced and the cooling action of the slab is reduced by the air flow generated in the concave groove, and thus the heat loss rate is reduced.

Further, as described in JP-A-61-279349, it has been known to cover a hot slab with a heat insulating hood. In addition, Japanese Utility Model Publication No. 61-1928 discloses a conveying device for directly conveying a high temperature slab to a rolling process. The upper side of the high temperature slab is covered with an upper heat insulating cover, and a heat insulating plate is provided under the slab. It was arranged to be placed.

[Problems to be Solved by the Invention]

However, in the above-mentioned configuration of the prior art, heat dissipation by the radiation effect of the high temperature slab, cooling of the slab by convection,
There is a limit to prevent the temperature drop of the cast slab due to the heat conduction of the roll itself. Among the above-mentioned conventional techniques, the actual publication 61-
The one described in Japanese Patent No. 1928 relates to direct rolling in which a slab obtained by continuous casting is directly rolled, but as shown in FIG. 1, the slab (high temperature slab 1)
Is a thick slab cut into short pieces. Conventional thickness
For slabs with a thickness of 200 to 300 mm, the length of the slab is also
There is a short length of about 10 m, but the slab thickness is 30 to 50 m.
In the case of a thin slab of m, the length of the slab becomes a continuous body of about 100 m, and the heat radiation area is about 10 times, so especially the recent thin slab continuous casting directly connecting thin slab continuous casting and hot rolling In the direct-coupling rolling equipment, the temperature of the cast slab of the thin slab also drops sharply.Therefore, according to the conventional technology, it is difficult to maintain the temperature of the hot cast slab of the thin slab high, and the direct rolling of the thin slab is performed. Was difficult.

The object of the present invention is to effectively prevent various heat radiation from the high-temperature slab, to hold the high-temperature slab in a high temperature state, and thus to enable the direct rolling of a slab with a thin slab such as a thin slab. (EN) Provided is a high-temperature slab conveyance device excellent in

[Means for solving the problem]

In order to achieve the above object, in the present invention, a roll that supports and conveys a high temperature slab, a heat insulating board disposed close to the slab on the lower side of the slab to be conveyed, and this slab. A slab continuous casting directly connected to the slab continuous casting and hot rolling, which has, on the upper side of the roll to be supported and conveyed, a heat insulating cover which covers the roll and is arranged so as to form an internal space around the roll. In a conveying device for high-temperature slab that supports a high-temperature slab of a continuously cast slab in a rolling facility and conveys the rolling slab directly connected to the rolling facility, the slab transported by the roll is a casting of a thin slab continuum. A plurality of rolls in the width direction of the roll shaft, the first and second curtains being arranged on the inlet side and the outlet side of the heat insulating cover and blocking the inflow of outside air into the internal space. Arranged narrow disc type rolls Then, a plurality of roll shafts in which the plurality of disc type rolls are arranged are arranged in a plurality of rows along the conveying direction of the cast piece of the continuous body of the thin slab, and a plurality of roll shafts that support and drive the disc type rolls. Respectively, are arranged outside the heat insulating board, and further provided with a seal cover arranged so as to cover the roll shaft and the portion of the disk-shaped roll protruding to the lower side of the heat insulating board. It is a thing.

In the above-mentioned high-temperature cast carrier, preferably, the plurality of disc-shaped rolls supported by the roll shafts of the plurality of rows are arranged in a staggered manner in the carrier direction of the cast product of the continuous body of the thin slab. Is.

In the above-mentioned apparatus for transporting high-temperature slab, preferably, a third curtain arranged so as to divide the internal space, and a gas supply means for supplying a reducing gas to each of the divided internal spaces are provided. It is a thing.

[Action]

According to the present invention, having a heat insulating board and a heat insulating cover, a slab continuous casting and hot rolling directly connected slab continuous casting directly connected rolling supporting the high temperature slab of the continuously cast slab in the rolling equipment is directly connected rolling In a high-temperature cast carrier for transporting to equipment, the cast carried by the roll is a cast of a thin slab continuum, and further, it is arranged on the inlet side and the outlet side of the heat insulating cover, A plurality of the rolls are arranged in the width direction of the roll axis, the first and second curtains blocking the inflow of outside air into the inner space, and the third curtain arranged so as to divide the inner space. As a narrow disc-shaped roll, the roll shaft in which the plurality of disc-shaped rolls are arranged is arranged in a plurality of rows along the conveying direction of the cast piece of the continuous body of the thin slab, and the disc-shaped roll is Support and drive A plurality of roll shafts, which are respectively arranged on the outside of the heat insulating plate, and a seal cover arranged so as to cover the roll shaft and the portion of the disk-shaped roll protruding to the lower side of the heat insulating plate. By including the above, it is possible to minimize the cooling due to the heat conduction of the transport roll or the like and the cooling due to the air flow that cause a large temperature decrease, and further, the heat insulation due to the radiation can be reduced by the heat insulating cover means.

EXAMPLES Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the overall structure of a thin slab continuous casting direct hot rolling equipment to which a conveying device according to the present invention is applied. In FIG. 1, the molten steel in the ladle 1 is calmed in the tundish 2 which is an intermediate pot, and then poured from the pouring nozzle 3 into the mold of the thin slab continuous casting machine 4 to start casting. It The high-temperature cast slab 6 which is molded and solidified by the mold of the thin slab continuous casting machine 4 is drawn out in a horizontal state by the bending straightening machine 5.

In order to prevent heat dissipation of the hot slab 6, heat retention is started from the most upstream part. Reference numeral 34 is a heat insulating cover provided on the curved portion, through which the tip of the slab 6 passes while undergoing a bending correction action, and the heat insulating cover 34 also has a guide function for guiding the movement of the slab 6. . Further, in particular, the heat insulating cover 35 shown enlarged in FIG. 2 has a function of covering a large gap formed between the straightening rolls 5a in the bending straightening machine 5.

After passing through the bending straightening machine 5, the slab 6 is introduced to the heat retaining / conveying table 7 in the previous stage, and the low shear temperature crop portion of the slab is cut by the running shear 8 and then the heat retaining / conveying table in the subsequent stage. After that, it is wound into a coil for the purpose of keeping heat in a cast slab winder 10. Usually coil weight is about 15-25
The cast slab 6 is cut by the running shearing machine 8 so as to have tons and wound in order. The wound coil is soaked in the next intermediate chamber 11, and then the slab 14 is supplied to the hot finish rolling mill 15 by the unwinder 12 and rolled to have a predetermined thickness of 2.0 to 6.0 mm, for example. Transport to the next process. The slab winder 10 described above,
The intermediate chamber 11 and the unwinder 12 are covered with a coil heat insulating cover 13.

Next, the configurations of the above-mentioned front and rear heat-retaining and conveying tables 7 and 9 will be described in detail with reference to FIGS. 2 to 5. 2 is a vertical cross-sectional view of the heat-retaining / conveying table 7, FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, FIG. 4 is a partially enlarged cross-sectional view of an essential part in FIG. 2, and FIG. It is a principal part top view in FIG. In the following description, the heat insulating transfer table 7 will be described. The heat-retaining / conveying table 9 also has a similar configuration.

Reference numeral 6 is a thin slab slab that moves inside the heat-retaining and conveying table 7. The slab 6 is on a transport roll 18, and the roll 18 has a width in order to reduce the loss of heat of the thin slab slab 6 which is transported by this roll due to the heat transfer action of the roll. Narrow disc type rolls (hereinafter referred to as disc rolls) are used, and a plurality of these disc rolls 18 are arranged in the width direction along the roll axis 19 so that the contact area between the slab 6 and the transport roll is minimized. ing. In addition,
As shown in FIG. 5, for example, two or three disc rolls 18 are arranged corresponding to each roll shaft, and are arranged in a zigzag state on the transport table. Disc roll
The staggered arrangement of 18 is to reduce the number of disc rolls 18 while optimizing the support of the slab 6 by the disc rolls 18. Also, the disc roll 18
Is formed of heat-resistant steel having a predetermined thermal conductivity under the condition that the total contact area with ceramic or slab having heat insulation and heat resistance capable of suppressing the heat transfer effect of itself is minimized. It As shown in FIGS. 3 and 5, the disc roll 18 is fixedly supported by a roll shaft 19, and the roll shaft 19 has bearings 27A, 27 provided at both ends thereof.
It is rotatably supported by B and is rotationally driven by a motor (not shown) via a chain 30 and a sprocket 26. Bearings 27A and 27B are support frames 28 as shown in FIG.
Attached to. In FIG. 2, the bearings 27A and 27B and the support frame 28 are not shown for the sake of convenience. Further, the roll shaft 19 is provided with a rotary joint 25 at one end thereof in order to prevent thermal deformation due to a temperature rise due to its heat transfer action, and through this rotary joint 25, cooling water is forced from outside to a cooling passage 24 in the shaft. It is cooled by flowing it.

The slab 6 is supported and conveyed by a plurality of disc rolls 18. Below the slab 6, a heat insulating board 17 is arranged in a state of approaching the slab 6 at a distance of about 20 to 50 mm. The heat insulating board 17 is supported by columns 37 provided on a support frame 36 as shown in FIG. This insulation board 17
As shown in FIG. 5, an opening 29 is formed by cutting out a portion where the upper portion of the disk roll 18 is arranged.
The upper part of the disk roll 18 is exposed to the upper side of the heat insulating board 17. Therefore, most of the disc rolls 18 and the roll shaft 19 supporting the disc rolls 18 are arranged at a position below the heat insulating board 17. As a result, the surface area of the roll occupying the inside of the greenhouse that is formed around the slab 6 is reduced, so that heat dissipation is suppressed. In addition, the disk roll 18
Also, a detachable seal cover 20 is provided so as to cover a predetermined portion of the roll shaft 19. The seal cover 20 has a function of blocking the inflow of the atmosphere from the gap formed between the disc roll 18 and the heat insulating board 17 in the opening 29. As shown in FIG. 4, the side surface shape of the seal cover 20 is substantially semicircular, and is shaped so as to match the outer peripheral shape of the disk roll 18 as much as possible. This reduces the internal volume of the seal bar 20 to prevent convection. Further, on the upper side of the disk roll 18 and the cast piece 6, there is provided a heat insulating cover 16 which is attached integrally with the heat insulating board 17 and is arranged so as to cover the cast piece 6. The heat insulating cover 16 is removable. Further, a heat insulating material 23 is provided on each inner surface of the heat insulating board 17 and the heat insulating cover 18 so as to entirely cover these surfaces. As described above, the presence of the seal cover 20, the heat insulating cover 16, the heat insulating board 17, the heat insulating material 23, and the like makes it possible to reduce the volume of the greenhouse which is formed around the disk roll 18 and the slab 6 and to generate convection. Can be suppressed and the heat retention effect can be enhanced. Insulation board
17, the seal cover 20, the heat insulating cover 16, and the heat insulating material 23 are cast pieces 6
Also, since the heat radiation from the disk roll 18 is blocked, it is possible to prevent the heat loss from the slab 6 due to the radiation action.

In FIG. 2, reference numeral 21 is a shutter provided at the entrance of the heat transfer table, and 22 is a cylinder for opening and closing the shutter 21. The shutter 21 is opened and closed by the cylinder 22 at a proper timing. This is to keep the inlet of the heat transfer table 7 as closed as possible and to cut off the contact with the outside air to suppress the slab cooling action by the air flow.

FIG. 6 is a vertical sectional view showing a second embodiment of the heat-retaining and conveying table according to the present invention. In this heat insulation transfer table, an entrance curtain 31 is provided at the entrance, an exit curtain 33 is provided at the exit, and at least one intermediate curtain 32 is provided inside to partition the internal space into a plurality of stages. Further, a gas supply port 38 communicating with the internal space is provided, and a reducing gas such as argon gas (Ar) or nitrogen gas (N ₂ ) is supplied through the gas supply port 38. According to this configuration, it is possible to suppress the oxidation of the high temperature slab 6 by the reducing gas, so that it is possible to reduce oxide scale loss and improve the yield of the slab,
The effect that the scale removing work of the next winding process becomes unnecessary is exhibited.

FIG. 7 shows the characteristic of the heat retaining effect by the heat retaining transport table according to the present invention. A is a temperature lowering characteristic when the heat-retaining and conveying table according to the present invention is applied, B is a conventional temperature lowering characteristic due to heat dissipation when the heat-retaining and conveying table according to the present invention is not used, and C is a section where the heat-retaining and conveying table exists. It is 15m long. As is clear from this characteristic diagram, when the heat-insulating transfer table according to the present invention is used, the temperature decreases at a rate of 40 ° C. per minute even when transferring a thin slab such as a thin slab. According to the temperature decrease characteristic B, the temperature decreases at a rate of 100 ° C. per minute. According to the present invention, it has a very remarkable heat retaining property. In order to enable continuous casting direct rolling, it is necessary to secure at a transformation temperature of 850 ° C or higher in the rolling mill of the final stand.
When using in four stages, it is essential to secure the slab temperature at 1000 ° C. or higher at the entrance of the first hot rolling mill, and as shown in FIG. According to the example, a thin slab such as a thin slab can be directly rolled.

Although the thin slab slab of 30 to 50 mm has been described in the above embodiments, the present invention can be applied to a transport table of a high temperature slab for handling a thick slab of 300 mm, boule, and billet.

As is apparent from the above description, according to one embodiment of the present invention, a disk type roll is used as a roll for transporting the slab and the heat insulating board is disposed close to the slab, and further in a greenhouse. Since the number of existing rolls is reduced as much as possible, the heat radiation due to heat conduction of the rolls and the heat radiation due to radiation can be greatly reduced, and the disk roll portion protruding outside the heat insulating board and the roll shaft portion supporting it. Since the seal is covered with a seal cover, the effect of heat generation is prevented and the heat retention effect is improved, and a curtain that shuts off the greenhouse from the outside air is provided on the heat transfer table to prevent the cooling of the slab by the air flow. You can In this way, the heat retention effect of the slab can be significantly improved,
Therefore, direct rolling can be performed.

Further, since the plurality of disc rolls are arranged in a zigzag manner, it is possible to reduce the number of disc rolls while appropriately supporting the slab.

In addition, by providing a curtain that partitions the interior of the greenhouse, and by providing a gas supply means, it is possible to reduce oxide scale loss and improve the yield of slabs, and the scale reduction work in the next winding process is unnecessary. Become.

[Effects of the Invention] According to the present invention, various heat dissipation from a high temperature slab is effectively blocked, the high temperature slab is kept in a high temperature state, and thus direct rolling of a slab having a thin slab thickness such as a thin slab is performed. It is possible to realize a high-temperature slab transfer device that has an excellent heat insulating effect.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a thin slab continuous casting direct rolling mill to which the present invention is applied, FIG. 2 is a side sectional view of a heat-insulating transfer table according to the present invention, and FIG. 3 is a line AA in FIG. Sectional view, FIG. 4 is a side sectional view of the main part around the disk roll in FIG. 2, and FIG.
FIG. 6 is a side sectional view showing a second embodiment of the heat-retaining / conveying table according to the present invention, and FIG. 7 is a characteristic view showing the heat-retaining effect according to the present invention. [Explanation of symbols] 1 …… Ladle 2 …… Tundish 4 …… Thin slab continuous casting machine 5 …… Bending straightening machine 6 …… Slab 7,9 …… Insulated transfer table 8 …… Running shearing machine 10 …… Slab rewinder 12 …… Splitter unwinding 15 …… Hot finishing rolling mill 16 …… Insulation cover 17 …… Insulation board 18 …… Disc roll 19 …… Roll shaft 20 …… Seal cover 21 …… Shutter 23 …… Insulation material 31,32,33 …… Curtain

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Saburo Moriwaki, No. 1 Kawasaki-cho, Chiba-shi, Chiba Inside the Chiba Works, Kawasaki Steel Co., Ltd. (56) 1928 (JP, Y2)

Claims (3)

[Claims] 1. A roll for supporting and conveying a high-temperature slab, an insulating board disposed below the slab to be conveyed and close to the slab, and an upper side of the roll for supporting and conveying the slab. In, having a heat insulating cover arranged to cover the roll and to form an internal space around the roll, and was continuously cast in a slab continuous casting direct rolling mill that directly connects the slab continuous casting and hot rolling. In a high-temperature slab conveying device that conveys a high-temperature slab of a slab to a directly connected rolling facility, the slab conveyed by the roll is a slab of a thin slab continuum, and the heat insulating cover A narrow disc having a plurality of rolls arranged in the width direction of the roll axis, the first and second curtains being disposed on the inlet side and the outlet side of the roll and blocking the inflow of outside air into the internal space. Form roll, A plurality of roll shafts in which the k-shaped rolls are arranged are arranged in a plurality of rows along the conveying direction of the slab of the continuous body of the thin slab, and a plurality of roll shafts that support and drive the disc-shaped rolls are respectively insulated A high temperature casting, which is arranged on the outer side of the board, and further comprising a seal cover arranged so as to cover the portion of the disk-shaped roll protruding to the lower side of the heat insulating board and the roll shaft. One piece transport device. 2. The plurality of disc type rolls supported by the plurality of rows of roll shafts are arranged in a zigzag pattern along a moving direction of a cast piece of the continuous body of the thin slab. Characteristic high-temperature cast carrier. 3. The third curtain according to claim 1, further comprising a third curtain arranged so as to divide the internal space, and a gas supply means for supplying a reducing gas to each of the divided internal spaces. A high temperature slab conveyor.