JPS5937709B2 - Dummy bar table for continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dummy bar table for a continuous casting machine, and more particularly to a horizontally installed dummy bar table for a vertical bending type continuous casting machine.

In a continuous casting machine that continuously casts molten metal, a dummy bar is inserted into the mold at the beginning of casting to form a temporary bottom, which is separated from the slab at a predetermined position when the slab descends.

At this time, the dummy bar separated from the slab must be held on a dummy bar table and moved away from the slab to a position that is sufficiently far away without interfering with the progress of the slab and avoiding the heat influence from the slab. A dummy bar table conventionally used in a mold continuous casting machine will be explained with reference to FIG.

Figure 1 shows a state in which the dummy bar 1 is separated and retracted to the dummy bar table 7, and continuous casting is continued in a normal state.At the beginning of casting, the dummy bar 1 is approximately equal to the cross section of the slab to be manufactured. A dummy bar head with the same cross section is inserted into the mold 2 to form a temporary bottom, and molten steel 3 is cast onto it, and after primary cooling in a water-cooled mold, the thickness of the solidified shell is gradually increased to form a slab. However, one dummy bar head and the dummy bar common body 1B following it are guided by a large number of guide rolls 5 together with the slab 4 formed on the upper part of the dummy bar head 1A, and the slab 4 is directly sprayed with cooling water in this area. It descends while being further cooled.

When the slab 4 passes through the so-called secondary cooling zone in this region, the unsolidified phase inside the slab 4 also completely solidifies, so the pinch roll 6 installed below the guide roll 5 The lowering of the slab 4 formed on one dummy bar head, which had been done by pulling out the dummy bar combination body 1B, is now carried out by gradually pulling out the slab that has completely solidified.

In the conventional vertical bending continuous casting machine, the dummy bar head 1A is cut off at the position where it passes through the slab drawing pinch roll band, and as shown in the figure, is guided by the dummy bar table 7 and retracted straight downward. The slab is bent by a bending device 8, and then straightened by a slab straightening device 9 to become a straight slab, which is then carried out by a carry-out table 10.

As mentioned above, conventional vertical bending type continuous casting machines can improve quality by bending the slab after solidification, but on the other hand,
Compared to a curved continuous casting machine, which bends the slab when an unsolidified phase remains inside the slab, there is a drawback in that the height of the equipment is usually much higher, typically 30 m or more.

Therefore, it would be uneconomical to install this expensive equipment only above ground due to the relationship with other equipment, so
m or more must be the pass line of the unloading table 10 for the slab 4.

Therefore, if the dummy bar table T is to be housed directly below the continuous casting machine as shown in FIG. 1, it will extend underground by a further a length than the total height A.

This is unavoidable because the height of the mold 2 is determined in relation to other molten steel conveying devices.

Therefore, the total height extending downward is the length of the hollow dummy bar, reaching 30 m, which approaches the limit value for civil engineering work and requires a huge amount of construction cost.

It is an object of the present invention to provide an effective configuration of a dummy bar table that can reduce the height extending underground due to the installation of a vertical bending type continuous casting machine, and that can fully satisfy the original function of the dummy bar. It is.

This object of the invention is achieved by the invention as summarized below.

The gist of the present invention is that, in a dummy bar table for operating a dummy bar used in the initial stage of casting of a vertical bending type continuous casting machine, a dummy bar table is provided horizontally at approximately the same height as the slab bending device of the continuous casting machine. a track, one main dummy bar car moving on the track, and at least one subsequent dummy bar car, the main dummy bar car accommodating the main part of the dummy bar in a curved state. It comprises a guide device, a pressing roll provided at the top when separating the dummy bar, a plurality of sets of dummy bar pinch rolls provided at the center, and a self-blade traveling device, and the at least one of the above-mentioned The dummy bar table for a continuous casting machine is characterized in that the following dummy bar carriage has a guide device for horizontally accommodating the remainder of the dummy bar, and a connecting part having a long unrestricted section is provided between each of the carriages. .

Embodiments of the present invention will be described with reference to FIGS. 2-4.

FIG. 2 is a sectional view showing a standby state of the dummy bar table according to the present invention, which is installed in a vertical bending type continuous casting machine.

That is, the dummy bar table 11 according to the present invention has a track 1 horizontally provided at approximately the same height as the slab bending device 8 inside the arc of the curved part of the manufactured slab 4 of a vertical bending type continuous casting machine.
2, and at least one subsequent dummy bar cart 14 following this, the main dummy bar cart 13 and the following dummy bar cart 14 are each The structure is as follows.

That is, the main dummy bar cart 13 includes a guide device 15 comprising a plurality of sets of rolls that guide the main parts of the dummy bar 1 of the dummy bar head 1A and the dummy bar combination 1B;
It has a pressing roll 16 provided at the top that presses one dummy bar head when separating the dummy bar, and a plurality of sets of dummy bar pinch rolls 17 provided at the center of the cart 13.

In addition, it has an o1 power traveling device (not shown),
A following dummy bar truck 14 can be connected to enable self-blade travel.

The trailing dummy bar truck 14 has a guide device 18 consisting of a plurality of sets of rolls for guiding the remainder of the dummy bar combination.

In addition, a main dummy bar truck 13 and a trailing dummy bar truck 14
The interpipe bogies are connected by a connecting portion 19, and the connecting portion 19 is provided with a long unrestricted section 20 as shown in FIG.

Next, a method of using the dummy bar table 11 according to the present invention will be explained.

The previous casting has been completed, and the drawing of slab 4 has also been completed.
When the dummy bar table 11 according to the present invention is sent to the unloading table 10, the self-blade traveling device moves the dummy bar table 11 in the direction A on the track 12 and enters the next casting preparation line.

That is, the upper end of the dummy bar head 1A is placed directly below the pinch roll 6, and the dummy bar pinch roll 17 is fed backward to feed the dummy bar 1 to the pinch roll 6 of the continuous casting apparatus.

When reverse feeding by the pinch rolls 6 becomes possible, the reverse feeding by both the dummy bar pinch rolls 17 and the pinch rolls 6 is switched to the reverse feeding by the pinch rolls 6, and one dummy bar head is inserted into the mold 2.

This means that the preparation for casting the dummy bar 1 has been completed, so the pouring of the molten steel 3 is resumed, and according to the normal operation of continuous casting explained earlier, the molten steel 3 is poured into the mold 2 through the primary cooling process and the guide roll section. While increasing the thickness of the solidified shell through secondary cooling, the dummy bar combination body 1B is pulled downward by a slab pulling device P including pinch rolls 6.

When the dummy bar head 1A reaches the upper end of the slab pulling device P, the end of the dummy bar combination 1B has reached the position of the dummy bar pinch roll 17 of the dummy bar table 11, so that the dummy bar 1 is pulled out by the pinch roll 6 and the dummy bar pinch roll 17. carried out by both parties.

When the dummy bar head 1A is thus pulled out to the slab bending device 8, the work of separating the dummy bar head 1A and the slab 4 begins.

The separation of the dummy bar head 1A and slab 4 is shown in Figure 4A.
Perform the steps shown in B and C.

That is, since the shape of one dummy bar head is in mesh with the slab 4 as shown in FIG. If it is pressed as shown in FIG. 4A, it can be separated as shown in FIG. 4C after passing through the state shown in FIG. 4B.

In this case, a main dummy bar cart 13 and a trailing dummy bar cart 1 constituting the dummy bar table 11 according to the present invention are used.
4 is provided with a so-called play of a long unrestricted section 20 as shown in FIG. The total length of table 11 is usually 30m.
Most of the dummy bar common body 1B is accommodated in the guide device 18, which consists of a large number of rolls, provided on the following dummy bar truck 14, but the force required to press the main dummy bar truck 13 is large. Therefore, the force for pressing the following dummy bar truck 14 can be reduced to a fraction of the actual force.

Therefore, the original output of the slab bending device 8 is sufficient, and there is no particular need to increase the output.

After separating one dummy bar head and slab 4,
Therefore, the circumferential speed of the dummy bar pinch roll 17 can be set several times the circumferential speed of the pinch roll 6 of the continuous casting machine to quickly return to the original state shown in FIG.

Thereafter, the dummy bar table 11 is moved in the direction shown in FIG. 2B by the self-blade traveling device to stand by for the next casting, and the slab bending device 8 is also moved back to its original position so as not to obstruct the passage of the slab 4. The operation of the dummy par 1 is completed by retracting it to the standby state.

In the dummy bar table 11 according to the present invention, instead of the method of separating one dummy bar head and the slab 4 by pressing the dummy bar head 1A through the roll 16 using the device 8 for bending the slab of the continuous casting machine, It is also possible to perform separation by directly driving the rolls 16, but in order to equip the dummy bar table 11 with the driving device required for this, the dummy bar table 11 becomes an oversized device and the slab of the continuous casting machine is This would be a double investment in bending equipment, which is not wise.

Various methods can be considered for determining the timing of the movement of the dummy bar table 11 according to the present invention as described above, but the best method is to detect the position based on the rotation speed of the dummy bar pinch roll 17 and standardize the movement. be.

The dummy bar table according to the present invention is installed horizontally at almost the same height as the slab bending device in a vertical bending type continuous casting machine, whereas in conventional continuous casting machines it was installed vertically below the slab bending device. It has an extremely high total length of more than 30 meters underground, which eliminates all the drawbacks that made the construction cost huge, and achieves the following effects.

(a) Since the dummy bar table according to the present invention is installed horizontally at almost the same height as the slab bending device as described above, the total height (A+a) of the conventional device shown in FIG. 1 is unnecessary, and A This made it possible to reduce the height to only 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000.

(D) In the dummy bar table according to the present invention, a device for separating the dummy bar head and slab is not particularly provided, and the slab bending device of a conventional continuous casting machine is used, and in addition, one main dummy bar car and one subsequent dummy bar car are used. A long unrestricted section, or so-called play, is provided in the connecting part with the cast iron, so that separation can be performed with a relatively small pressing force, so it can be used as is without increasing the capacity of conventional slab bending equipment. , we were able to reduce the equipment cost of the dummy bar table by AIm.

(c) The dummy bar can be smoothly inserted into the mold without any modification to the conventional vertical bending type continuous casting machine, and without any hindrance to the original continuous casting operation. Work and separation work from slabs can be carried out.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the arrangement of a conventional dummy bar table in a vertical bending continuous casting machine, FIG. 2 is a sectional view showing a dummy bar table according to the present invention in a vertical bending continuous casting machine, and FIG. 3 is a sectional view showing the arrangement of a conventional dummy bar table in a vertical bending continuous casting machine. FIG. 4 is a partially enlarged front view showing a connecting part provided between each dummy bar car of the dummy bar table, and FIG.
A represents the state immediately before the separation operation, B represents the state during separation, and C represents the state immediately after separation. 1...Dummy bar, 2...Mold, 7.
...Conventional dummy bar table, 8...
Slab bending device, 11...Dummy-table of the present invention, 12...Race, 13...Main dummy bar one car, 14...Following dummy bar one car,
15... Guide device (main truck), 16...
・Press roll, 17...Dummy bar pinch roll, 18...Guide device (following cart), 19.
...Connection between bogies, 20...Unrestricted section.

Claims (1)

[Claims] 1. In a dummy bar table for operating a dummy bar (slab guide rod) used in the initial stage of casting in a vertical bending type continuous casting machine, there is a track provided horizontally at approximately the same height as the slab bending device of the continuous casting machine. , including one main dummy bar truck moving on the track and at least one following dummy bar truck, the main dummy bar truck housing a main part of the dummy bar in a bay state. The device includes a pressing roll provided at the top for separating the dummy bar, a plurality of sets of dummy bar pinch rolls provided at the center, and a self-blade traveling device, and at least one of the following devices is provided. A dummy bar table for a continuous casting machine, wherein each dummy bar carriage has a guide device for horizontally accommodating the remainder of the dummy bar, and a connecting part having a long unrestricted section is provided between each of the carriages.