JPH0994640A - Method for discharging residual material in tundish and device for elevating/lowering tundish weir used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of a casting operation by lowering a tundish weir after completing the discharge of residual material. SOLUTION: At the time of supplying molten steel 20 into a tundish providing a tundish nozzle 9, the inner part of the tundish is sectioned into a part in which the nozzle 9 exists and a part in which the nozzle 9 does not exist, with the tundish weir 3. After supplying the molten steel, the tundish weir 3 is elevated to pass the molten steel through each part. The elevating/lowering of the tundish weir 3 is executed by pushing/removing between the inclining surfaces 6a-6d of an inclining member and the inclining surfaces 7a-7d of an inclining member 7 connected through a vertical member 5. In such a way, the residual material composed of the molten steel 20 and flux 21 in the part, in which the tundish nozzle 9 does not exist, is discharged from the nozzle 9 through a gap at the lower end of the weir 3 and further, after completing the discharge of the residual material, the weir 3 is lowered. By this method, the tundish can sequentially be reused without executing the troublesome removing operation of the residual material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tundish weir residue discharging method for discharging the residue of a tundish with a weir in a continuous casting machine, and a tundish weir lifting device used therefor.

[0002]

2. Description of the Related Art Conventionally, in the tundish inside the continuous casting machine, it is necessary to remove the flux accumulated inside the tundish and the molten steel that cannot be discharged between the tundish weirs during the casting operation after the molten steel is supplied from the ladle. Various removal methods for removing the residue in the tundish are disclosed.

For example, in the method for removing the residue of a tundish disclosed in Japanese Patent Laid-Open No. 4-172156, a used tundish is moved to a maintenance area by a trolley, and then the tundish is straddled. A gate type trolley for maintenance is installed, and the clamp device and lifting cylinder provided in this gate type trolley grabs the tundish weir and lifts the trolley. Work to remove things.

When the tundish weir is attached, the tundish weir is fixed by an operation reverse to that of the above-mentioned removal work, and after the installation, the mortar material is sprayed by the nozzle device provided on the gate type carriage to fix the tundish weir.

[0005]

However, in the above residue removal work, the clamp device for raising and lowering the tundish weir and the raising and lowering cylinder are large in scale, so that the ladle and the ladle in the continuous casting machine are It is difficult to install these devices during the tundish to carry out the residue removal work.Therefore, after the tundish is moved to the maintenance area, the tundish with the cooled residue adheres to it. Since the dish weir will be removed, the work of removing residues such as flux will be complicated and the work efficiency will deteriorate, and the removed tundish weir will not be able to be reused, resulting in a significant work cost. There was a problem.

Further, since the tundish weir cannot be moved up and down inside the continuous casting machine, at the end of casting work,
There was a problem that the residual steel between the two tundish weirs could not be supplied to the mold and a large amount of material wasted by removing and discarding it at the maintenance shop. Therefore, the present invention has been made by paying attention to the above-mentioned unsolved problems, and in the continuous casting machine, by elevating the tundish weir, the residue inside the tundish is exhausted without leaving any residue. An object of the present invention is to provide a tundish weir residue discharge method and a tundish weir raising / lowering device used therefor, which makes it possible to reuse a tundish weir while eliminating the work of removing a substance.

[0007]

In order to solve the above-mentioned problems, a method for discharging a residue of a tundish according to the present invention, when supplying molten steel to a tundish equipped with a tundish nozzle for discharging molten steel, A tundish weir is arranged and held so as to divide the inside of the tundish into a part with a tundish nozzle and a part without the tundish nozzle, and after the molten steel is supplied to the tundish, the tundish weir is lifted to each section. By communicating with
The residue consisting of molten steel and flux in the section not equipped with the tundish nozzle is discharged from the tundish nozzle through a gap formed at the bottom of the tundish and the lower end of the tundish weir, and further after the completion of discharging the residue. The feature is that the tundish weir is lowered.

As a result, during continuous casting, the tundish weir is arranged so as to divide the inside of the tundish into a plurality of compartments, and the molten steel supplied to the inside of the tundish and the inclusion of inclusions such as flux due to convection or the like. And promotes the floating separation of the flux. In addition, when the molten steel and the flux inside the tundish are discharged after the molten steel is supplied to the tundish, by raising the tundish weir, the compartments are communicated through the gap created at the bottom of the tundish weir, The molten steel in the section not provided with the nozzles flows out through the gap to the tundish nozzle, whereby the molten steel and the flux inside the tundish can be completely discharged.

Furthermore, after the completion of the discharge of molten steel, the tundish weir can be reused as it is by lowering the tundish weir by gravity and again dividing the inside of the tundish into a plurality of compartments. Also,
By making the specific gravity of the tundish weir smaller than the residue inside the tundish, after supplying the molten steel of the tundish, the tundish weir is lifted by buoyancy to communicate the compartments, and after the completion of discharging the residue. By lowering the tundish weir by gravity, the tundish weir can be easily moved up and down without providing a special device or the like.

On the other hand, the tundish weir raising / lowering device according to the present invention includes an elevating guide provided vertically on the widthwise inner side surface of the tundish, a tundish weir guided and supported by the elevating guide, and the tundish. A taper member attached to the upper side of the weir and provided with inclined surfaces on both upper and lower sides of the wall surface in the longitudinal direction of the tundish; an inclined member having inclined surfaces contacting each inclined surface of the tapered member; It is characterized in that it is composed of a drive device that is driven in the horizontal direction.

Accordingly, a drive device for driving the tundish weir horizontally is provided to hold the position of the tundish weir, and when the tundish weir divides the inside of the tundish into a plurality of compartments when the molten steel is supplied to the tundish. The tundish weir can be fixed to prevent the tundish weir from rising due to buoyancy. Further, by fixing the position where the tundish weir floats when the tundish residue is discharged by the driving device, the residue inside the tundish is reduced and the buoyancy of the tundish weir is lowered, so that the tundish weir is lowered by gravity. Prevent from doing.

Further, the contact surface between the inclined member attached to the drive unit and the taper member attached to the tundish weir is made to be an inclined face, so that the tundish weir that floats as the drive unit moves. It is possible to guide and guide the bottom of the tundish weir together with the movement of the drive device, without adjusting the amount of the gap generated on the lower side or when the floating tundish weir is lowered.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, reference numeral 1 is a tundish lifting device, which is attached to a tundish weir 3 that is vertically movable at two locations so as to partition the inside of the tundish 2, and Elevating guides 4 provided on both sides of the tundish weir 3 along the upper and lower sides of the inner side surfaces facing each other in the width direction, and a vertical member 5 attached to the center of the upper end surface of the tundish weir 3.
And a taper member 6 attached to the upper end of the vertical member 5 and provided with inclined surfaces at four upper and lower positions, an inclined member 7 that abuts the tapered member 6, and a drive device 8a for driving the inclined member 7 in the horizontal direction. .About.8d.

First, a ladle nozzle (not shown) for supplying molten steel from the ladle to the inside of the tundish 2 is attached to the upper part of the tundish 2 and further to the outside 2 of the tundish weir 3. A tundish nozzle 9 for supplying the molten steel inside the tundish 2 to the mold is provided at the bottom of the location. The vertical member 5 is a plate-like member, the lower end of which is joined to the center of the upper end of the tundish weir 3, and the upper end of which extends from the opening 2b of the upper plate 2a of the tundish 2.

On the other hand, as shown in FIG. 2, the tapered member 6 joined to the upper end of the vertical member 5 above the upper plate 2a of the tundish 2 has inclined surfaces 6a and 6b on the upper side and an inclined surface on the lower side. 6c and 6d are respectively formed symmetrically, the upper inclined surfaces 6a and 6b are upward inclined surfaces toward the center of the upper surface of the taper member 6, and the lower inclined surface is at the lower surface center. It is a downward slope. Also, the inclined surfaces 7a to 7f that are in surface contact with the inclined surfaces 6a to 6d, respectively.
An inclined member 7 made of a block having 7d is in contact therewith.

Further, the driving device 8 connected to the outer end of each tilting member 7 is a cylinder here, and the drive shaft 11 and the center of the outer end of the tilting member 7 are horizontally mounted. , The main body of each drive device 8 is a band 1
It is fixed to the upper plate 2a of the tundish 2 by 0. Further, the stroke of the drive device 8 is such that when the drive shaft 11 is the longest, the inclination member 7 becomes
The taper member 6 is set so as to come into contact with the inner ends of the inclined surfaces 6a to 6d, and when the drive shaft 11 is shortest, the taper member 6 can be vertically inserted through the gap between the inclined members 7 facing each other.

A method of discharging a tundish residue using the tundish lifting device 1 thus constructed will be described. First, during normal continuous casting, molten steel 20 is fed from a ladle (not shown) to the inside of the tundish 2. Are supplied to the tundish 2 and are accumulated inside the tundish 2, and the flux 21 for keeping the temperature of the molten steel and for preventing the surface oxidation of the molten steel is supplied, and the tundish weir 3 causes the molten steel to flow upward so that non-metallic inclusions in the molten steel float up. After being separated, only the molten steel 20 is adjusted and supplied to the mold from the tundish nozzle 9 at the bottom.

Further, in the tundish weir 3, the strokes of the upper driving devices 8a and 8b are the longest, and the tilting member 7
The inclined surfaces 7a and 7b of the taper member 6 are inclined surfaces 6a and 6b.
When the tundish weir 3 is pressed down by contacting the inner end of the tundish, the inside of the tundish 2 is arranged so as to be partitioned into a plurality of compartments, and the floating separation of non-metallic inclusions in the molten steel inside the tundish 2 is performed. Facilitate.

When the supply of the molten steel 20 from the ladle is completed and the residue of the tundish 2 is discharged, the upper drive devices 8a and 8b are opened as shown in FIG. The tundish weir 3 floats due to buoyancy, a gap is created under the tundish weir 3, and the plurality of compartments partitioned by the tundish weir 3 communicate with each other. Therefore, the molten steel 20 accumulated between the tundish weirs 3 and 3 having no tundish nozzle at the bottom is filled with the tundish weir 3 through the gap between the bottom of the tundish 2 and this tundish weir 3.
Is supplied to the mold through a tundish nozzle 9 at the outer bottom of the.

After that, the molten steel 2 inside the tundish 2
When the amount of 0 decreases and the buoyancy applied to the tundish weir 3 decreases, as shown in FIG. 4, the lower drive devices 8c, 8c
The drive shaft 11 of d has the longest length, and the inner ends of the lower inclined surfaces 6c and 6d of the taper member 6 come into contact with the inclined surfaces 7c and 7d of the inclined member 7, so that the tundish weir 3 floats up. To prevent the tundish weir 3 from descending due to gravity.

The molten steel 20 inside the tundish 2
When the flux 21 is exhausted after all the gas is supplied to the mold, and the residue inside the tundish 2 is exhausted, the lower drive devices 8c and 8d are gradually opened to incline as shown in FIG. The contact surface between the member 7 and the taper member 6 moves to the outside of the taper member 6, and the tundish weir 3 is installed so as to partition the inside of the tundish 2 without free fall.

In this way, two sets of upper and lower drive devices 8a-8
d is not used for raising and lowering the tundish weir 3, but is used only for holding the position of the tundish weir 3 and controlling the buoyancy and gravity applied to the tundish weir 3, so that the tundish raising and lowering is performed. The entire apparatus 1 can be made small and installed between the ladle and the tundish 2.

Further, since the tundish weir 3 moves up and down, no residue is generated inside the tundish weir 3 at the end of the casting operation, and the molten steel 20 inside the tundish 2 can be entirely used as a casting material. At the same time, the flux 21 can also be discharged from the tundish sluice 9 and discarded after the casting is completed. Therefore, it is not necessary to remove and replace the tundish weir 3, and if the flux 21 discharged to the nozzle is discharged, continuous It is also possible to restart the casting operation.

The flux 21 is not necessarily limited to being discharged from the tundish nozzle 9, and the discharging work can be performed after moving the tundish 2 to the maintenance place as in the conventional case. Of course. In addition, the ascending / descending speed of the tundish weir 3 can be controlled by the taper member 6 provided on the upper end of the tundish weir 3 and the slanting member 7 that abuts against the taper member 6, especially when the floating tundish weir 3 descends. Moreover, the tundish weir 3 can be guided and guided by the inclined surface without dropping and colliding with the bottom of the tundish 2 and damaging it.

Further, when the tilting member 7 contacts the taper member 6, the ends of the tilting member 7 and the taper member 6 collide with each other and damage the drive unit 8 even if there is some displacement. Can also be prevented. In this embodiment, the case where the specific gravity of the tundish weir 3 is smaller than that of the residue inside the tundish 2 and the tundish weir 3 is moved up and down by utilizing buoyancy and gravity has been described. However, the present invention is not limited to this. For example, as shown in FIG. 6, the wire rope 22 is attached to the upper end of the tundish weir 3 having a larger specific gravity than the residue at a position where it is not immersed in the molten steel.
By attaching a small winch 23 or the like for winding up the tundish 2 to the upper surface of the upper plate 2a of the tundish 2, the tundish weir 3 is appropriately driven by the rotary drive of the small winch 23.
It is also possible to raise and lower.

[0026]

As described above, according to the tundish residue discharge method and the tundish weir lifting device of the present invention, the position maintenance of the tundish weir and the buoyancy and gravity applied to the tundish weir can be prevented. By installing a small-scale driving device for control in the gap between the ladle and the tundish in the continuous casting machine to enable the tundish weir to move up and down, the residue between the adjacent tundish weirs at the end of the casting operation Everything can be discharged.

As a result, the tundish can be continuously reused without performing a complicated work of removing the residue, so that the casting work efficiency can be greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a tundish lifting device applied to an embodiment of the present invention.

2 is a side sectional view showing the tundish lifting device of FIG. 1. FIG.

FIG. 3 is a side sectional view showing a state at the end of supplying molten steel from the ladle of the tundish lifting device.

FIG. 4 is a side sectional view showing a state just before the completion of discharging the residue in the tundish.

FIG. 5 is a side sectional view showing a state at the end of discharging the residue in the tundish.

FIG. 6 is a side sectional view showing another method of raising and lowering the tundish weir.

[Explanation of symbols]

 1 is a tundish lifting device 2 is a tundish 2a is an upper plate 2b is an opening 3 is a tundish weir 4 is a lifting guide 5 is a vertical member 6 is a tapered member 6a to 6d is an inclined surface 7 is an inclined member 7a to 7d is an inclined surface 8 is a drive device 9 is a tundish nozzle 10 is a band 11 is a drive shaft 20 is molten steel 21 is flux 22 is wire rope 23 is a small winch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyuki Kato 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Kawasaki Steel Co., Ltd. Chiba Steel Works (72) Inventor Kazuhiro Kaya, Kawasaki-cho, Chuo-ku, Chiba Kawasaki Steel Co., Ltd.Chiba Works

Claims (3)

[Claims] 1. When supplying molten steel to a tundish equipped with a tundish nozzle for discharging molten steel, a tundish weir is provided so as to divide the inside of the tundish into a portion having a tundish nozzle and a portion not having the tundish nozzle. After the molten steel is supplied to the tundish, the molten steel is supplied to the tundish, and the tundish weir is raised to communicate the respective compartments with each other. Discharging the substance from the tundish nozzle through the gap formed at the bottom of the tundish and the lower end of the tundish weir,
Further, the method for discharging the residue of the tundish, which comprises lowering the tundish weir after the completion of discharging the residue. 2. The tundish residue discharging method according to claim 1, wherein the specific gravity of the tundish weir is made smaller than the residue inside the tundish,
After supplying the molten steel to the tundish, the tundish weir is raised by buoyancy to communicate with the section, and after the discharge of the residue is finished, the tundish weir is lowered by gravity. Residue discharge method. 3. An elevating guide provided up and down on a widthwise inner side surface of the tundish, a tundish weir guided and supported by the elevating guide, and a tundish weir attached to the upper side of the tundish weir and having an inclined surface vertically. A taper member provided,
An elevating device for a tundish weir, comprising an inclining member having an inclining surface that abuts each inclining surface of the taper member, and a drive device for driving the inclining member in the horizontal direction.