JPH0631415A - Equipment for supporting and cooling cast slab in continuous casting facility - Google Patents

Abstract

PURPOSE:To provide an equipment for supporting and cooling a cast slab, in which the support of the cast slab is secured and high cooling capacity is obtd. and the sticking of scale and rotation failure of guide rolls are eliminated. CONSTITUTION:The equipment consists of plural guide rolls 2-5 arranged so as to abut on the surface of the cast slab, and a wall members 27 arranged at trapezoidal gap formed between the two adjacent guide rolls and the surface of the cast slab. The wall member 27 is provided with a tip surface 28 facing the surface of the cast slab with a gap and slit shape nozzles 32, 33 opened facing the tip surface. The wall member 27 is connected with a jacket demarcated over the interval from the back surface of each guide roll 3-5 to the adjacent guide rolls. A supplying part for supplying the cooling water toward the rear part of the guide roll 3-5 is arranged in the jacket and the slit type nozzle is communicated with a demarcated chamber 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supporting and cooling a slab coming out of a mold in a continuous casting facility.

[0002]

2. Description of the Related Art A continuously cast metal is passed through a mold 51 which is itself cooled as shown in FIG. Therefore, the molten metal Ca has a cylindrical solidified shell Cb formed on the outer periphery thereof, and is pulled out of the mold 51 in the state of the cast slab C in which the molten metal Ca remains. Then, the cast slab C pulled out from the mold 51 is further cooled by the support cooling device 52. At this time, the shell Cb develops with cooling, but the shell Cb immediately after coming out of the mold 51 is thin,
If there is a weak portion, it breaks due to the internal static iron pressure, causing a breakout in which molten metal Ca leaks out. If the shell Cb is not uniformly cooled, cooling cracks may occur, which also causes breakout.

Therefore, in the prior art, when cooling the cast slab C coming out of the mold 51 so as not to cause a breakout, the outside of the slab C is supported by a guide roll 53 (conventional example I), or high pressure water is used. Pressure is applied to the slab C through the inside (conventional example II).

As the conventional example I, there is one disclosed in Japanese Patent Application Laid-Open No. 3-248753, and this apparatus restrains the cast slab C with a pair of a plurality of guide rollers 53 as shown in FIG. It is pulled out downward (arrow P), and the guide roll 53 is covered with a jacket 54 so that the cooling water W flows in parallel with the guide roll. Further, as the conventional example II, for example, JP-A-2-303657, JP-A-2-274353, and Japanese Utility Model Laid-Open No. 2-13
There is a device described in Japanese Patent No. 8052. As shown in FIGS. 11 to 12, a tank 61 is arranged with a small gap 60 between the cast piece C coming out of the mold 51 and a high pressure cooling water is supplied from a slit 63 formed in an inner wall 62. The slab C is jetted to support and cool the slab C.

However, in the conventional example I, although the slab support is reliable and breakout and bulging are easily prevented, only a part of the cooling water comes into contact with the slab C, and the slab C Since a water vapor phase is likely to be generated on the surface of the above, there is a problem that the cooling efficiency is inferior to the high pressure water cooling type of the conventional example II. In the conventional example II, although the cooling capacity is high, the slab C is caused by solidification shrinkage and meandering of the slab C.
If the size of the gap 60 between the inner wall 62 facing the mold and the slab C fluctuates, there arises a problem that the static pressure of the cooling water is nonuniform, the pressure does not rise, or the control thereof is difficult. For,
There is a problem that proper slab support cannot be provided.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention takes advantage of the guide roll support method while incorporating nozzle cooling, which is an advantage of high pressure water type,
Therefore, it is a first object of the present invention to provide a slab support cooling device which has reliable slab support and high cooling capacity. Further, in the guide roll supporting method, there is a problem that the scale of the slab accumulates between the roll and the jacket, resulting in poor roll rotation, and further, the temperature of the guide roll rises and the scale adheres to the guide roll. The second object of the present invention is to eliminate such adhesion of scale and poor rotation of the guide roll, although there is a problem that it is easy.

[0007]

A first aspect of the present invention is an apparatus for supporting and cooling a slab coming out of a mold of a continuous casting facility, in a drawing direction of the slab so that the slab comes into contact with the surface of the slab. A plurality of guide rolls arranged at intervals along the wall, and a wall member provided in a trapezoidal gap formed between two adjacent guide rolls and the surface of the slab. The member is provided with a front end surface facing the surface of the cast slab with a gap, and a slit-shaped nozzle opening to the front end surface, and further supplies cooling water to the nozzle behind the wall member. It is characterized by having a waterway system.
In the second aspect of the invention, the wall member is connected to a jacket that divides the guide rolls from the rear of the guide rolls to the adjacent guide rolls, and a supply unit that supplies cooling water to the jackets toward the back surface of the guide rolls. It is preferable that the slit-shaped nozzle of the wall member is provided and communicates with a compartment constituted by the wall member and the jacket.

[0008]

In the first aspect of the invention, the support against the static iron pressure of the slab is performed not by the static pressure of the cooling water but by the guide rolls. Therefore, it is possible to surely support, and it is possible to reliably suppress bulging due to the static iron pressure of the slab. Further, the cooling water is sprayed directly to the slab, not from the nozzle provided on the wall member, as in the case of the type of apparatus which is supported by high-pressure water, so that the cooling capacity is high and uniform cooling is possible. Thereby, the first object can be achieved. In the second invention, the cooling water is first supplied to the guide roll, so that the scale on the surface of the guide roll is removed. Further, the cooling water passes between the jacket and the guide roll and is jetted from the nozzle of the wall member to the slab. Therefore, the scale does not accumulate between the jacket and the guide rolls. Thereby, the rotation failure of the guide roll due to the scale is prevented, and the second object is achieved.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. (First Embodiment) FIG. 1 is a schematic perspective view of a slab support cooling device of the present invention, and FIG. 2 is a cross-sectional side view of essential parts of a slab support cooling device 1 according to the first embodiment of the present invention. . FIG. 3 is FIG.
It is a principal part cross-section top view of the slab support cooling device 1 to show. Figure 1
C is a slab, and the support cooling device 1 has a short side
It is provided on the C1 side so as to be symmetrical. Long side C2
The side may be provided with a conventional type supporting cooling device (for example, the type described in Japanese Patent Laid-Open No. 3-248753), or the supporting cooling device of the present invention. Further, when the slab C is thin, the support cooling device 1 of the present invention may be provided only on the long side C2 side, and the short return 3 side may be supported by a guide shoe or the like without providing a support roll.

The support cooling device 1 has a frame 7 having a U-shaped cross section as shown in FIGS. 1 and 3, and a plurality of (4 in FIG. 1) guides are provided between the side walls 8 of the frame 7. Rolls 2, 3, 4, and 5 are rotatably supported. That is, as shown in FIG.
The shaft 5 is supported by a shaft 13 extending between the side walls 8 and 8 via a bush 14. A space 15 is provided between the guide rolls 2 to 5 as shown in FIG. A hose for supplying cooling water is provided on the rear wall 9 of the frame 7.
10 are connected. The number of guide rolls is a slab C
Any number may be used depending on the size and shape (slab, billet, bloom, etc.). In FIG. 1, reference numeral 16 is a protrusion fixed to the frame 7, and is pivotally attached to the bracket 6 shown in FIG. Reference numeral 17 is a hydraulic cylinder that applies a biasing force to the guide roll.

Referring to FIG. 2 in detail, the V-shaped blocks 20, 21, 22, 23 are arranged so as to fill the gap (15 shown in FIG. 1) between the adjacent guide rolls 2-5. The base portion is exchangeably fixed to the rear wall 9 with bolts 25 or the like. The blocks 20 to 23 partition the adjacent guide rolls 2 to 5 and form a compartment 26 for accommodating one guide roll. That is, the frame 7 and the blocks 20 to 23 constitute a jacket for cooling water.

The end portions of the blocks 20 to 23 are wall members which spread in a T shape (blocks 20 to 22) or an L shape (block 23). The wall members 27 are arranged in a trapezoidal gap H formed between the two adjacent guide rolls and the surface of the cast slab C in the gap 15, and the tip surface 28 of the wall member 27 has a slab. 1 is a flat surface that forms a slight gap G1 with the surface. The portion of the wall member 27 facing the guide rolls 2 to 5 has a cylindrical concave surface 31 facing the guide rolls 2 to 5 with a slight gap G2.
Are formed. As a result, the compartment 26 substantially surrounds the guide rolls 2 to 5 except for the contact portion with the slab C. Further, the wall member 27 communicates with the compartment 26, and as shown in FIGS.
Slit-shaped nozzles 32, 33 having openings are formed.
In this embodiment, the upper nozzle 32 extends horizontally with respect to each of the guide rolls 2 to 5, and the lower nozzle 33 is inclined downward.

Of the blocks 20 to 23, the one between the first guide roll 2 at the upper end and the second guide roll 3 at the upper end covers from the rear of the first guide roll 2 to the vicinity of the upper end, and the nozzle is Not formed. This is because the nozzle 35 for injecting the highly viscous cooling liquid is separately provided between the mold 51 and the first guide roll 2. An air nozzle may be provided on the upper surface of the block 20 to form an air curtain that prevents the cooling water from blowing up to the mold. No nozzle is formed in the block 23 below the fourth guide roll 5 at the lower end. The block
The base end sides of 20 to 23 spread out in a trapezoidal or triangular shape to form a cooling water passage between the guide rolls 2 to 5 and are fixed to the rear wall 9 of the frame 7. A supply port 36 for supplying cooling water to the compartment 26 is formed on the rear wall 9 so as to face the back surface of each of the guide rolls 20 to 23. The hose described above is connected to each supply port 36 via a connector 37.
10 is installed.

Next, the operation of the support cooling device 1 configured as described above will be described. In the cooling support device 1 of FIG. 2, the row of the guide rolls 2 to 5 is pressed against the slab C by the urging force of the hydraulic cylinder 17. As a result, the slab C is prevented from bulging due to static iron pressure, guided by the rotating guide rolls 2 to 5, maintains a constant cross-sectional shape, and is drawn downward while being cooled. On the other hand, the cooling water supplied from the supply port 36 of the rear wall 9 cools the guide rolls 3 to 5 when entering the compartment 26. As a result, the life of the guide rolls 3 to 5 is extended, and moreover the scale is less likely to adhere to the guide rolls 3 to 5. Further, since the cooling water in the compartment 26 passes through the passage between the guide rolls 3 to 5 and the blocks 21 to 23 in one direction, it acts to push the scale in the passage. Therefore, blocks 21-23 and guide roll 3
It is possible to prevent scales from accumulating between the guide rolls 3 to 5 and causing defective rotation of the guide rolls 3 to 5.

Further, the cooling water in the compartment 26 is jetted from the nozzles 32, 33 toward the surface of the cast slab C. Then the nozzle
Since 32 and 33 are slit-shaped, the surface of the cast slab C is uniformly and efficiently cooled. This prevents problems such as cooling cracks in the slab due to uneven and insufficient cooling. Further, since the gap G1 between the wall member 27 and the cast slab C is small, all the cooling water is efficiently exposed to the surface of the cast slab C without waste,
Make cooling effective. As shown in FIG. 2, if the blocks 20 to 23 are detachably attached with bolts 25 or the like,
Appropriate gaps G1, G depending on the material of the slab C, the type of cooling water, etc.
There is an advantage that the block giving 2 can be easily replaced.

(Second Embodiment) As described above, in the support cooling device 1 of the first embodiment, the cooling liquid is supplied from the back side of the guide rolls 3 to 5 into the compartment 26. Is not limited to this, and a configuration in which cooling water is directly sprayed onto the cast slab C as shown in FIGS. Block 3 in the embodiment of FIGS.
A cooling water passage 41 is formed in 9,40, and the hose 10 is connected to a supply port 41a formed at a position corresponding to the passage 41 of the rear wall 9, whereby the cooling water is connected to the tip surfaces of the blocks 39,40. The three vertically elongated slit-shaped nozzles 42 that open are directly communicated with each other. The supply port 36 at the rear of the compartment 26 may be tightly plugged with a plug 43.

In this embodiment, the cooling water is not guided into the compartment 26 but is directly sent to the nozzle 42 and jetted toward the slab C.
Therefore, as compared with the first embodiment, the temperature of the cooling water is lower and the pressure is higher, so that the cooling effect of the cast slab C is higher. It should be noted that whether to use the apparatus of the first embodiment or the apparatus of the second embodiment may be selected according to the material of the cast slab C, the drawing speed, and the degree of the scale. It can be changed by simple work such as replacement and hose replacement. Further, in this embodiment, block 3
9 and 40 are separated into a front end side 44 and a base end side 45, and fastening bolts 38 and the like make them detachable. With such a configuration, since only the tip side 44 can be exchanged from the front side of the apparatus, it is not necessary to remove the guide rolls 2 to 5 at the time of exchange, and therefore it is easier to replace the nozzles than the entire block. There is an advantage that the shape and the gap G between the cast slab C can be changed.

(Third Embodiment) In the embodiment shown in FIG. 7, the base end side 45 of the block is the same as that shown in FIGS. 5 to 6, and only the front end side 44a is replaced. On the tip side 44a, there are three laterally extending slit-shaped nozzles 46 and passages.
46a is formed. This embodiment also has the same high cooling effect and ease of replacement work as the second embodiment.

(Fourth Embodiment) In the embodiment shown in FIG. 8, the front end side 44b of the block is constructed as shown in FIG. That is, vertical slit nozzles 47 that penetrate the wall member 27 to the back side are formed in the upper and lower portions of the wall member 27, and the shaft portion 48 has no passage. Therefore, by combining this block 44b with the base end side 45 of the block of FIGS. 5 to 6, a nozzle 47 reaching the gap G1 from the compartment 26 containing the guide rolls 2 to 5 is formed as shown in FIG. That is, by simply changing the connection ports between the tip ends 44, 44a and the hose 10 in FIG. 6 or 7, it is possible to change to a type in which cooling water is substantially jetted to the guide rolls 2 to 5 as in FIG. it can.

[0020]

According to the first aspect of the invention, since the slab is supported and guided by the row of guide rolls, the support effect is high and bulging can be effectively prevented. Moreover, since the cooling water is sprayed onto the surface of the slab by utilizing the gap between the guide rolls, it is possible to achieve an excellent slab cooling effect equivalent to that of the high pressure water supporting system. Further, according to the second aspect of the invention, since the cooling water is once directed to the guide rolls, the cooling effect of the guide rolls is high, and the rotation failure of the guide rolls due to the scale can be effectively prevented.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a slab support cooling device of the present invention.

FIG. 2 is a sectional side view of a main part of a cast slab support cooling device 1 according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional plan view of an essential part of the slab support cooling device 1 shown in FIG.

FIG. 4 is a front view of a main portion of the cast slab support cooling device 1 shown in FIG.

FIG. 5 is a cross-sectional plan view of essential parts of a cast slab support cooling device according to a second embodiment of the present invention.

6 is a cross-sectional side view of essential parts of the slab support cooling device shown in FIG.

FIG. 7 is a cross-sectional side view of essential parts of a cast slab support cooling device according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional side view of essential parts of a cast slab support cooling device according to a fourth embodiment of the present invention.

9 is a perspective view of a block used in the slab support cooling device shown in FIG. 8. FIG.

FIG. 10 is a perspective view of a main part showing an example of a conventional slab support cooling device.

FIG. 11 is a cross-sectional view of essential parts showing another example of a conventional cast slab support cooling device.

12 is a front view of relevant parts of the slab support cooling device shown in FIG. 11. FIG.

[Explanation of symbols]

1 Support cooling device 2 Guide roll 3
Guide roll 4 Guide roll 5 Guide roll 7
Frame 20 block 21 block 22
Block 23 Block 26 Room 32
Nozzle 33 Nozzle 42 Nozzle 47
nozzle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keiji Nakajima 4-533 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Sumitomo Metal Industries, Ltd. (72) Toshihiko Murakami 4-chome, Kitahama, Chuo-ku, Osaka City, Osaka Prefecture No. 33 Sumitomo Metal Industries, Ltd.

Claims (2)

[Claims] 1. A device for supporting and cooling a slab coming out of a mold of a continuous casting facility, which is arranged at intervals along the drawing direction of the slab so as to come into contact with the surface of the slab. It is composed of a plurality of guide rolls and a wall member provided in a trapezoidal gap formed between two adjacent guide rolls and the surface of the slab, and the wall member forms a gap with the surface of the slab. And a slit-shaped nozzle that opens in the tip surface, and a water channel system that supplies cooling water to the nozzle is provided behind the wall member. A slab support cooling device in a characteristic continuous casting facility. 2. The wall member is connected to a jacket partitioning from the rear of each guide roll to the space between adjacent guide rolls, and the jacket is provided with a supply unit for supplying cooling water toward the back surface of the guide roll. The slab support cooling device according to claim 1, wherein the slit-shaped nozzle of the wall member communicates with a compartment constituted by the wall member and the jacket.