JPS6019798Y2 - Side heat retention device for high temperature slabs - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat retention device for high-temperature slabs, and more particularly, to a side heat retention device for high-temperature slabs that are conveyed while being clamped by a group of guide rolls in continuous casting equipment.

In a continuous casting apparatus, generally, as shown in FIG. 1, molten steel 2 stored in a tundish 1 is injected into a mold 3 to form a slab 4, and the slab 4 is continuously pulled out by a group of guide rolls 5 and then transferred. Send to table 6.

The transfer table 6 is configured so that the continuously delivered slabs 4 are cut into a set length by a cutting device 7, and transferred to subsequent equipment to manufacture desired slabs 4.

For example, the length of the water cooling area in the guide roll group 5 and the guide roll group are adjusted so that the solidification of the slab 4 is completed to the core at the end of the guide roll group 5, that is, at the time when it is delivered from the guide roll group 5 to the transfer table 6. The installed machine length of 5 is set appropriately.

Conventionally, the slab 4 cut by the cutting device 7 is once cooled down to room temperature in a cooling facility or the like, subjected to cold reading maintenance or temporary storage, and then reheated and sent to the rolling line for the next process. This was common.

However, since the slab immediately after being cut is at an extremely high temperature, the conventional method causes a very large energy loss, and requires a large amount of cost to install and maintain cooling equipment, heating equipment, etc. Ta.

For this reason, in the past, the cut slab 4 is sent directly to the rolling line without being cooled, or it is heated to the temperature necessary for rolling with a heating device, etc., and then sent to the rolling line, which is a so-called hot charging method. Attempts have also been made to roll the slab 4 directly, but the temperature drop of the slab 4 during transfer through the guide roll group 5 and the transfer table is significant, and the temperature drop is uneven in its cross section, so direct rolling is not possible. Very little and necessarily a large amount of heat in the heating device was required.

In addition, some attempts have been made to maintain the temperature of the slab 4 at a high temperature by installing heat retention equipment in the guide roll group 5, but as is well known, the guide roll group 5 has many devices and equipment in a narrow space. The conventional heat retaining equipment is equipped with such equipment that the gap between the rolls is extremely small, and the thickness of the slab 4 to be conveyed varies. Therefore, its heat retention effect is extremely low, and there are many difficulties in maintaining the guide roll group 5, etc., and there are many problems in putting it into practical use.

The present invention aims to proactively solve the problems in the conventional means, and aims to provide an effective heat retaining device that can maintain the temperature of the slab 4 delivered from the guide roll group 5 as high as possible. This is the purpose.

Hereinafter, the configuration of the present invention will be explained in detail based on examples.

Now, as a result of investigating the temperature drop of the slab 4 conveyed by the guide roll group 5, the inventors of the present invention found that the temperature drop at the ends of the slab 4 is very large, but at the center of the slab 4 it is extremely small. It was confirmed that there is.

Based on the above knowledge, the inventors of the present invention have conducted various research studies on devices for retaining heat at the end portions, that is, the side surfaces, of the slab 4 while it is being conveyed on the guide roll group 5.

FIG. 2 is a cross-sectional structural diagram of a side heat retaining device (hereinafter simply referred to as a heat retaining device) devised based on the above research, that is, an embodiment of the present invention, and FIG. 2 is a side view, and FIG. 4 is a cross-sectional structural view taken along line AA in FIG. 2.

2 to 4, 8 is a heat retaining plate, and the heat retaining plate 8 is a side surface X of the slab 4 and an upper and lower surface y of a predetermined length from the side surface X (the side surface X and the upper and lower surfaces y are collectively referred to as The guide roll group 5 has a groove-shaped cross section so as to cover the side surface (hereinafter referred to as the side surface), but the portion of the guide roll group 5 corresponding to the roll 50 is cut out and divided into upper and lower parts.

The divided lower heat plate 81 is held by a lower member 91, and the upper heat insulating plate 82 is held by an upper member 92.

That is, unless otherwise specified, the divided lower heat plate 81 and lower member 91, upper heat insulating plate 82, and upper member 92 constitute the heat insulating plate 8 having a groove-shaped cross section and having a roll compatible notch. Hereinafter, the subordinate heat plate 81 and the lower member 91 that constitute the heat retaining plate 8 will be collectively referred to as the lower member, and the upper heat retaining plate 82 and the lower member 91 will be collectively referred to as the lower member.
and the upper member 32 are collectively referred to as the upper member.

As the heat retaining plate 8, it is preferable to use a heat insulating material such as asbestos or ceramic fiber.

Reference numeral 10 denotes a sliding support member that supports the lower member 91 in a slidable manner. It is composed of a bearing member 102 that slidably supports the.

Reference numeral 12 denotes an actuating device consisting of a gas or liquid pressure cylinder that moves the lower member 91 back and forth toward the slab side surface X.

By the way, the upper roll 50a of the guide roll group 5 is the slab 4.
It is configured to move up and down in response to changes in the thickness of the
In addition, pinch rolls 51 are arranged at appropriate intervals in the guide roll group 5, and by rotating the slab 4 or dummy bar while holding it between the upper and lower rolls of the pinch rolls 51, the slab 4 or the dummy bar is pulled out and conveyed. .

For this reason, the distance between the upper and lower rolls changes in various ways, and especially when a common dummy bar is used for slabs 4 having several thicknesses, when the dummy bar passes, the distance between only the pinch rolls 51 is different from that of the other rolls. A situation may also occur where the spacing is narrower than the spacing between the rolls.

In FIG. 2, reference numeral 16 denotes a reduction cylinder for raising and lowering or lowering the upper roll 50a of the pinch roll 51.

One of the features of the present invention is that it can accurately follow such changes in the distance between the upper and lower rolls, and can efficiently retain heat on the side surface of the slab.

Therefore, the upper member 92 is attached to the chock 13 of the upper roll 50a so as to be horizontally movable, and is engaged with the lower member 91 via the engagement device 14.

That is, in this embodiment, a support pin 151 is fixed to the upper roll chock 13 of the pinch roll 51 in a protruding manner, and a horizontal guide groove 152 through which the support pin 151 is inserted is bored in the upper member 92. By inserting the support pin 151, the upper member 92 is supported by the upper roll chock 13 so as to be horizontally movable.

Of course, if the lifting and lowering of the upper roll 50a of the pinch roll 51 and the other upper rolls 50a are always synchronized or the difference in lifting amount is extremely small, the support pin 151 and the pinch roll as in this embodiment may be used. It is not limited to the upper roll chock 51, but may be fixed to the chock 13 of any upper roll 50a.

Furthermore, the engagement device 14 of this embodiment is provided with an elevation guide hole 141 bored in the vertical direction in the lower member 91 and protruding from the lower surface of the upper member 92. It is composed of a rod 142.

The upper member 92 then moves up and down as the upper roll 50 moves up and down, and moves back and forth in synchronization with the lower member 91 by the engagement device 14.

That is, the upper member 92 is engaged with the lower member 91 in a freely interlocking manner.

Heat retaining plate 8 and upper and lower members 9 (upper member 92 and lower member 9
1 are collectively referred to as the upper and lower members 9.

), as shown in FIG. 2, there is no gap even when the upper roll 50a is raised to the highest position, and as the upper roll 50a descends, for example, the lower heat plate 81 and the upper heat insulating plate 82 overlap. All you have to do is design the divided cross-sectional structure.

Now, in order to enhance the heat retaining effect of the heat retaining device, it is preferable to make the gap t between the surface of the slab 4 and the inner surface of the heat retaining plate 8 as small as possible.

On the other hand, the position of the side surface of the slab 4 often fluctuates because bulging strain occurs on the side surface or meandering of the slab 4 often occurs.

Therefore, in the present invention, the upper and lower members 9 are moved forward or backward by the operation of the actuating device 12 so that the heat insulating plate 8 always approaches the slab side surface X with a predetermined gap t in response to fluctuations in the slab side surface position. It is configured like this.

To operate the actuating device 12 as described above, for example, the fourth
In the illustrated embodiment, a transfer roller 17 is attached to the lower member 91, and the configuration is such that the gap t between the heat retaining plate 8 and the slab side surface X becomes a predetermined amount while the transfer roller 17 is in contact with the slab side surface X. The operating pressure of the actuating device 12 is adjusted so that the transfer roller 17 is always in contact with the side surface of the slab at a set contact pressure.

As a result, meandering or bulging distortion of the slab 4 occurs,
If an abnormal pressure is applied to the transfer roller 17 in the direction of arrow a, the lower member 91 automatically moves backward, and in the opposite case, the lower member 91 moves forward, making it possible to always maintain the predetermined gap t.

Although not shown, the side position of the slab 4 immediately in front of the heat retaining device is detected using a well-known phototube, laser, etc., or with a side position detection device such as a mechanical contact type, and the operation is performed based on the output signal of the detection device. It is also possible to perform this function by activating the device 12.

As detailed above, the present invention always maintains the gap between the side surface of the slab 4 and the heat retaining plate 8 even in continuous casting equipment where the slab thickness and width dimensions vary and/or where dummy bars that differ from the slab thickness pass. Since the high-temperature slab 4 can be maintained at a predetermined amount, it is possible to efficiently insulate the side surface of the high-temperature slab 4 being conveyed by the guide roll group 5. In addition, since the structure is extremely simple, it can be easily and efficiently maintained even in a narrow space. It can be installed reliably and has excellent maintainability.

Therefore, when the heat retention device of the present invention is used, when the slab 4 leaves the water cooling area,
By attaching it to any part of the guide roll group 5 while it is being transported from the air cooling area to the transfer table 6, it is now possible to maintain the temperature of the side surface of the slab 4 at an extremely high temperature.

Figure 5 shows the effect of this invention, 25077177
Slab 4 of 1 thickness x 1000mm width is 1.677L /
This figure compares the temperature drop of the slab 4 when the heat retaining device of the present invention is installed and when it is not installed when manufacturing at a transfer speed of 50 min.

In this embodiment, the gap t between the heat insulating plate 8 and the side surface of the slab is 3
-1 The horizontal protrusion length 1 of the heat insulating plate 8 (see Figure 2) is 10
0 mm, and the heat retaining plate 8 is installed in a range of 2077L following the water cooling area to the end point of the guide roll group 5.
The average temperature in the thickness direction of the central part in the width direction, the part 25 mm from the side surface, and the temperature of the side corner part were investigated.

As is clear from FIG. 5, the temperature at the center can be maintained at 1211°C even at the end point, that is, at a position 37rrL from the meniscus, even without a heat retaining device, as shown by the solid line a, but 25rIr! In the case where there is no heat retaining device at the location n and the corner, the temperature drops significantly to 800° C. and 630° C., as shown by the thin broken line b' and the thin dot-dashed line C'.

On the other hand, when the heat retention device of the present invention is installed, 25
It was possible to maintain the temperature at 99TO as shown by the thick dashed line in the forward part, and to 921°C in the corner part as shown by the thick dashed line C, and it was possible to significantly reduce the temperature drop.

Therefore, when the heat retaining device of the present invention is installed, before the slab 4 pulled out from the guide roll group 5 reaches the rolling mill,
It has now become possible to directly roll only the side surfaces by slightly heating them using, for example, an edge induction heating device.

As detailed above, the practical effects of the present invention are very large.

[Brief explanation of drawings]

Figure 1 is a cross-sectional structural diagram of a well-known general continuous casting equipment.
2 to 5 show an embodiment of the present invention, and FIG. 2 is a cross-sectional structural diagram showing an embodiment of a heat retaining device based on the present invention;
3 is a side view of FIG. 2, FIG. 4 is a cross-sectional structural view taken along the line AA in FIG. 2, and FIG. 5 is a chart showing the results of an experiment to demonstrate the effects of the present invention. 1... Tandish, 2... Molten steel, 3
...Mold, 4...Slab, 5...
... Guide roll group, 50 ... Roll, 50a
...Top roll, 51 ... Pinch roll, 6 ... Transfer table, 7 ... Cutting device, 8 ... Heat retention plate, 81... Lower body heat plate, 82... Upper heat insulating plate, 91... Lower member, 92... Upper member, 10... Sliding support member, 11... Heat retention device support frame, 12...
... Actuating device, 13... Chock, 14...
...Engagement device, 16...Reduction cylinder
17... Transfer roller.

Claims (1)

[Claims for Utility Model Registration] A slab side support with a thin cross section that is slidably supported via a sliding support member and has a roll compatible notch that is actuated by an actuator to move forward and backward toward the slab side. In a heat retention device for a roll-held slab conveyor equipped with a hot plate, the heat retention plate is inserted into a lower member connected to the actuating device and a lifting guide hole formed in the lower member so as to be movable up and down. and an upper member that is engaged with the lower member via an engagement rod and is horizontally movably mounted on the upper roll chock, and is divided so that the upper and lower members form a groove-shaped cross section. A side heat retention device for high-temperature slabs featuring: