JP2571894B2 - Metal spill prevention device in continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal spill prevention device in a continuous casting machine for minimizing damage from a metal spill accident when a breakout occurs.

[0002]

2. Description of the Related Art When a breakout occurs in a continuous casting machine, the hot metal that has flowed down adheres to the rolls and roll bearings of a support roll segment and flows down toward the segment below it. As a result, the roll with the metal cannot be rotated, and for recovery, not only must the entire casting stand be replaced, but also the segments below it need to be replaced. In particular, in the case of a large spill spill accident, the spill could have spilled up to $ 3 segments, and the recovery required an average of 14 hours.

In order to cope with such a breakout, as disclosed in JP-A-4-37458 and JP-A-4-46658, a technique for predicting a breakout from a molten metal level and a mold temperature has been conventionally used. Proposed. Japanese Utility Model Application Laid-Open No. 54-33413 discloses a technique for spraying cooling water to a corner of a slab with a spray nozzle to prevent breakout. However, these prior arts were ineffective against breakouts that had already occurred.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and stops a spill area of a metal when a breakout occurs in a support roll segment. The present invention has been made in order to provide an ingot spill prevention device in a continuous caster that can be restored in a short time simply by replacing the caster.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a continuous caster in which a protector provided with a drainage-suppressing member between frames and provided with a rotating roller at the lower end thereof is provided. The rotary roller is mounted inside the support roll segment, and the rotating roller is brought into contact with the short side of the slab at a predetermined pressure.

[0006]

In the apparatus of the present invention, the rotating roller at the lower end of the protector is brought into contact with the short side of the slab passing through the support roll segment at a predetermined pressure by a cylinder or the like during casting. The metal that is going to flow out from between the roll segments is prevented from flowing down by a flow-down suppressing member such as expanded metal stretched between the frames of the protector, and solidifies on the protector. For this reason, the damage caused by the metal that has flowed down to the lower segment does not occur, and it can be restored in a short time only by replacing the casting stand. Also,
In this protector, only the rotating roller at the lower end is in contact with the slab, so there is no abrasion on the surface of the slab during normal operation. Does not accumulate.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the illustrated embodiments. FIG. 1 shows a main part of a continuous casting machine, in which 1 is a mold composed of a long-side copper plate 1a and a short-side copper plate 1b, and 2 is a support roll segment installed thereunder. The support roll segment 2 is composed of, for example, 10 pairs of support rolls 3 arranged vertically, and the slab drawn from the mold 1 passes between the support roll segments 2 and is further installed therebelow. It passes through # 0 segment 4 and # 1 segment 5. The mold 1 and the support roll segment 2 are mounted on a casting stand 6 and have a structure that can be replaced collectively within a short time when an accident occurs.

Now, inside the support roll segment 2 configured as described above, on both sides of the support roll 3,
Protectors 7 are respectively attached. As shown in FIG. 2 in an enlarged manner, the protector 7 is provided with a flow-down suppressing member 9 capable of draining water between a pair of left and right frames 8 and a rotating roller 10 provided at a lower end thereof. The reason why the flow-down suppressing member 9 can drain water is to prevent the cooling water injected toward the slab from collecting.
As such a flow-down suppressing member 9, an expanded metal having a high effect of capturing a high-temperature metal or a large number of parallel bars can be used.

The upper ends of these protectors 7 are pivotally connected to the vertical beams 11 of the support roll segment 2 by horizontal pins. An air cylinder 12 is provided between the center of the protector 7 and the vertical beam 11, and a rotating roller 10 at the lower end of the frame 8 is pressed against a short side on both sides of the slab passing through the support roll segment 2 by a predetermined pressure. Contact. If the contact pressure is too strong, there is a risk of generating scratches on the surface of the slab.If the contact pressure is too weak, it is impossible to stop the flowing metal, but in the examples, 70 to 100 kg.
They are in contact with each other.

These protectors 7 retract the rotary roller 10 by retracting the air cylinder 12 except at the time of casting, but actuate the air cylinder 12 immediately after the dummy bar has passed at the start of casting to cause the rotary roller 10 to slab. Contact the short sides on both sides of the. This state is shown in FIG. By adjusting the contact pressure of the rotating roller 10 as described above,
Continuous casting can be performed without generating scratches on the surface of the slab, and cooling water injected toward the slab during casting flows through the downflow suppression member 9, so that the protector 7 is not used. Continuous casting can be performed in the same manner as in the above case.

When a breakout occurs during continuous casting in this way, a high-temperature slab flows out from between the support roll segments 2. This breakout is likely to occur on the short side of the slab, and since the long side of the slab is in contact with a large number of support rolls 3, the ingot mainly flows out of the gap between the support rolls 3 on the short side of the slab. . However, according to the present invention, since the rotating roller 10 at the lower end of the protector 7 is in contact with the short sides on both sides of the slab, as shown in FIG. It is caught and solidified by the flow-down suppressing member 9 such as expanded metal. For this reason, even if a large amount of bullion flows out, the # 0 segment 4 and the # 1 segment 5 below the support roll segment 2
Never reach.

Therefore, according to the present invention, even if a large amount of ingot flows out, the damage can be stopped inside the support roll segment 2, so that the casting stand 6 is replaced after the solidified ingot is removed. Just do 2-4
It can be restored in a short period of time.

[0013]

As described above, the metal spill prevention device in the continuous casting machine according to the present invention captures the metal immediately even when a breakout occurs, and limits the metal spill area to only the inside of the support roll segment. So you can stop at
There is an advantage that the continuous casting machine can be restored in a short time only by replacing the casting stand including the support roll segment.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a continuous casting machine provided with a metal spill prevention device of the present invention.

FIG. 2 is a perspective view showing a main part of the embodiment of the present invention.

FIG. 3 is a front view showing a use state of the embodiment of the present invention.

FIG. 4 is a front view showing a use state of the embodiment of the present invention.

[Explanation of symbols]

 2 Support roll segment 7 Protector 8 Frame 9 Downflow suppressing member 10 Rotary roller

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeki Okada 5-3 Tokai-cho, Tokai-shi, Aichi Prefecture Nippon Steel Corporation Nagoya Works (56) Reference Reference

Claims (2)

(57) [Claims] 1. A drainage-controlling member capable of draining water is stretched between frames, and a protector having a rotating roller at the lower end thereof is mounted inside a support roll segment of a continuous casting machine. A metal spill prevention device in a continuous casting machine, wherein the device is brought into contact with a side. 2. The metal spill prevention device in a continuous casting machine according to claim 1, wherein the flow-down suppressing member is an expanded metal.