JPH07110397B2 - Twin belt type 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 twin-belt type continuous casting apparatus for effectively cooling a part of a belt in a mold region.

[0002]

2. Description of the Related Art FIG. 3 is a side view schematically showing an example of a conventional twin belt type continuous casting apparatus. As shown in the figure, 1
Each of the pair of endless belts 6 has a bearing block 4,
The belt 6 is wound around a top pulley 1 and a bottom pulley 2 respectively supported by 4'and a side pulley 3 supported by a movable bearing box 5 to rotate, and the belt 6 is attached to a large number of grooves 1a of the top pulley 1. It is cooled by the water film of the cooling water jetted from the jet nozzle 8 at the tip of the water supply pipe 9 and the cooling pad 16 in which the cooling water circulates. A fin roll 13 supported by a frame 15 via a shaft 14.
Also, being backed up by the cooling pad 16, the pair of belts 6 descend in opposition. The part of the pair of belts 6 that descends in opposition to each other, and the belts 6 that are sandwiched between both ends thereof.
A mold for the moving wall is formed by the pair of side dams 7 which rotate in synchronization with.

Molten steel L is continuously supplied to the mold from a pouring nozzle 17, and a solidified strip-shaped slab S is guided downward by a guide roller apron 18 and drawn out by a pinch roll (not shown).

[0004]

In the above-mentioned conventional apparatus, since the jet nozzle 8 has one stage, the high flow velocity region of the cooling water is narrow in the vertical direction, and therefore the range of high heat removal is narrow. Displacement / deformation, blockage of the jet nozzle 8,
Disturbance with respect to fluctuations in the molten metal surface, uneven pouring flow, etc. is reduced. In particular, when the molten steel level in the mold is lowered, the belt 6 under high heat load near the molten level becomes insufficiently cooled, causing thermal deformation of the belt 6 and, in the worst case, an explosion accident due to melting damage of the belt 6. May occur.

Further, since the gentle nozzles 8 loosely fitted in the grooves 1a of the top pulley 1 are arranged in the width direction of the belt 6 due to the narrow width, the cooling water sprayed from each jet nozzle 8 is provided. The water films are interfered with each other, the water film is disturbed to form a thin portion thereof, and the belt 6 has an insufficient cooling portion.

The present invention is intended to provide a twin-drum type continuous casting apparatus which can solve the above problems.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a cooling water nozzle is installed by descending between a top pulley and a bottom pulley of a pair of belts that are endlessly wound around a top pulley, a bottom pulley and a side pulley to rotate. Part and 1
In a twin-belt type continuous casting apparatus that forms a mold with a pair of side weirs, the cooling water nozzles are arranged in upper and lower two stages,
An upper scoop and a lower scoop are arranged below the upper cooling water nozzle and the lower cooling water nozzle, respectively.

[0008]

In the present invention, a pair of belts are rotated, and cooling water is sprayed from the upper cooling water nozzle to the descending portion of each belt to form a water film for cooling. This is eliminated by a scoop, and the disturbance of the water film due to the interference of cooling water between the adjacent upper cooling water nozzles is prevented. And
Cooling water is further injected from the lower cooling water nozzle to the belt below it to maintain the required flow velocity of the water film, and the water film is thickened to stabilize the flow, and the ineffective portion of this cooling water is lowered. It is eliminated by a scoop to mitigate the turbulence of the water film on the downstream side due to ineffective water interference.

As described above, the descending belt portion is evenly and effectively cooled, and the molten metal is poured into the mold formed by the pair of cooled descending belts and the pair of side dams. The strip-shaped slab that is continuously supplied and solidified is pulled out from below.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view of a twin belt type continuous casting apparatus according to the embodiment, in which a main part is broken, and FIG. 2 is a sectional view taken along line II-II of FIG.

In FIGS. 1 and 2, reference numeral 1 denotes a pair of top pulleys, on the outer peripheral surface of which a plurality of grooves 1a are formed in the circumferential direction. Reference numeral 6 denotes a pair of belts, which are endlessly wound around the top pulley 1 and a bottom pulley and a side pulley (not shown) so that the pair of belts 6 face down between the top pulley 1 and the bottom pulley. Has become. Reference numeral 7 denotes a pair of side weirs which endlessly connects a large number of rectangular blocks, and is adapted to rotate in synchronization with the belt 6, and the descending portion thereof faces the pair of belts 6 facing each other. It is sandwiched by both ends of a portion between the descending top pulley 1 and bottom pulley. A mold for the moving wall is formed by the descending portions of the belt 6 and the side dam 7.

Reference numeral 8 denotes a jet nozzle, which is mounted on the tips of a large number of water supply pipes 9 which are loosely fitted in the grooves 1a of both top pulleys 1. Reference numeral 10 denotes a pair of lower jet nozzles, and the jet angle with respect to the belt 6 is 5 ° to 15 ° at a position 200 mm to 300 mm below the jet nozzle 8.
As shown in FIG. 2, the width of each belt 6 is wider than that of the pouring nozzle 17 by 50 mm to 300 mm, and the cooling water injection port 10a has a slit shape.

Reference numeral 11 denotes a pair of upper scoops, which are arranged on the upper surfaces of both lower jet nozzles 10 so as to form a predetermined gap with the belt 6. Reference numeral 12 denotes a pair of lower scoops, which are arranged below the lower jet nozzle 10 so as to form a predetermined gap with the belt 6. Thirteen
Is a fin roll, which is rotatably supported by a frame 15 via a shaft 14 so as to back up both belts 6 and arranged below the lower jet nozzle 10. Reference numeral 16 denotes a pair of cooling pads through which cooling water circulates, and is arranged below the fin rolls 13 so as to contact the back surfaces of both belts 6 for cooling and backup. Reference numeral 17 denotes the pair of belts 6 and the pair of side dams 7
It is a pouring nozzle for pouring molten steel L into the portion of the mold formed in.

In the present embodiment constructed as described above, both belts 6 and side dams 7 are rotated to back up belts 6 by fin rolls 13 and cooling pads 16.

Then, the cooling water is jetted from each jet nozzle 8 above the molten metal L in the molds of both belts 6 to form a water film having a required thickness, and the water film is cooled. The ineffective water having a required thickness or more is removed by the upper scoop 11 to prevent the disturbance of the water film due to the interference of the cooling water between the jet nozzles 8 adjacent to each other. Further, the cooling water is jetted from both lower jet nozzles 10 to a portion slightly below the surface of the belt 6 where the flow velocity of the water film by the jet nozzle 8 is lowered to maintain the required flow velocity of the water film and thicken the water film. And make it a high heat removal zone. The ineffective water of the cooling water is removed by the lower scoop 12 so that the water film has a required constant thickness. Further, the belt 6 therebelow is cooled by both cooling pads 16.

Molten steel L is continuously supplied to a mold of a moving wall formed by the cooled belt 6 and the side dam 7 by a pouring nozzle 17, and a solidified strip-shaped slab S is drawn out from below.

As described above, in this embodiment, the upper jet nozzle 8 and the upper scoop 11 and the lower jet nozzle 10 and the lower scoop 12 form a water film having a desired thickness on the surface of the pair of belts 6. It is possible to prevent the turbulence of the water film, and further to maintain the flow velocity of the water film to expand the high heat removal region to the lower side. Unbalanced pouring flow, belt displacement
It is possible to factory the disturbance resistance against the deformation upper cooling water nozzle clogging and the like.

[0018]

As described above in detail, in the present invention, since the lower cooling water nozzle is provided in addition to the upper cooling water nozzle, the water film flow velocity of the cooling water jetted from the upper cooling water nozzle is improved. At the lower position where it drops, cooling water can be jetted again to the belt to prevent the water film flow velocity from decreasing, so the high heat removal area of the belt expands downward and the water film on the belt surface becomes thicker. Become. Therefore, the belt can be sufficiently cooled. For this reason, the present invention is to improve the disturbance to the deterioration of the molten metal surface, the deviation of the pouring flow, the displacement and deformation of the belt, the blockage of the upper cooling water nozzle, etc., and to improve the stability and safety of the equipment You can

Further, in the present invention, since the upper water scoop and the lower water scoop are provided, the ineffective water of the cooling water can be eliminated at an early stage, so that the stable water film flow and the reduction of the accumulated water area can be expected, and the reliability of the equipment can be improved. It is possible to improve the sex.

[Brief description of drawings]

FIG. 1 is a side view of a twin belt type continuous casting apparatus according to an embodiment of the present invention with a main part cut away.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a side view schematically showing an example of a conventional twin belt type continuous casting apparatus.

[Explanation of symbols]

 1 Top Pulley 6 Belt 7 Side Dam 8 Jet Nozzle 10 Lower Jet Nozzle 10a Injection Port 11 Upper Scoop 12 Lower Scoop L Molten Steel S Slab

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Hirata, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor, Kazutoshi Nakashi 4 6-22 No. 6 Hiroshima Research Institute, Mitsubishi Heavy Industries, Ltd. (72) Noriyuki Kanai No. 1 Nishinosu, Oita-shi, Oita Pref., Nippon Steel Co., Ltd. Oita Works (72) Tetsuo Imi Oita-shi, Oita Pref. Nishinosu No. 1 Nippon Steel Co., Ltd. Oita Works (72) Inventor Keiichi Katahira 1-1-1 Edamitsu, Yawatahigashi-ku, Kitakyushu, Fukuoka (56) References Flat 4-91852 (JP, A) Japanese Patent 6-102257 (JP, B2)

Claims (1)

[Claims] 1. A portion of a pair of belts, which are endlessly wound around a top pulley, a bottom pulley, and a side pulley and rotate, and which descends between the top pulley and the bottom pulley and in which a cooling water nozzle is arranged, and a pair of belts. In a twin-belt type continuous casting apparatus for forming a mold with side weirs, the cooling nozzles are arranged in upper and lower two stages, and an upper scoop and a lower scoop are respectively disposed below the upper cooling water nozzle and the lower cooling water nozzle. A twin-belt continuous casting machine characterized by this.