JPH06154963A - Remaining molten metal and remnants discharge device - Google Patents

Abstract

PURPOSE:To dispense with an inclination rotation of a tundish of a large scale, and to improve the safety by closing an outlet part of a discharge passage pierced in the lower part of the tundish with a flapper, and thereafter, filling the discharge passage with filling sand. CONSTITUTION:A tundish 1 is subjected to inclination rotation so that its discharge passage 2 side become a little lower. An air cylinder 14 is shortened, and a rod 15 is detached from a fixed plate 13. By turning a shaft 9, a turning arm 8 is turned, and by moving a flapper 7 to the lower part, closing of the discharge passage 2 is released. Filling sand filled in the discharge passage 2 is discharged to a remaining molten metal discharge pot 17 in the lower part, and subsequently, remaining molten metal and remnants 5 are discharged. When discharge of the remaining molten metal and remnants 5 is completed, the flapper 7 is closed, and after the discharge passage 2 is filled with the filling sand, the next work is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for discharging a residual hot water residue, which is indispensable for continuous use of a tundish used for continuous steelmaking casting.

[0002]

2. Description of the Related Art Conventionally, as a technique for discharging the residual slag of the tundish during continuous use in steelmaking continuous casting, as an example without a switchgear, an overflow hole is provided at the end of the tundish or at the upper part of the side surface. Yes, the tundish is tilted 90 degrees to discharge the residual hot water.

Further, as an example having an opening / closing device, a discharge hole is provided at the bottom of the tundish and one or two sliding nozzles are used for this hole, or a method of opening and closing the hole from above using a stopper. There is an example implemented.

[0004]

Conventionally, as a technique for discharging the residual hot water residue, in a technique without a switch device, the residual hot water residue is discharged by tilting the tundish by 90 degrees. However, this method requires equipment for tilting the tundish by 90 degrees, and requires maintenance and installation of sealing material every time by using a hole that is always open, increasing equipment investment, so-called 3K. There was the problem of human intervention in the work.

In addition, in the case of using a sliding nozzle as an example having an opening / closing device, a tundish continuous use such as continuous casting of different kinds is adopted as a target. However, this sliding nozzle can withstand opening and closing a plurality of times, but in the hot rolling operation of continuous casting, the same tundish is required to be used several hundred times, for example, 800 times. Therefore, when the sliding nozzle is directly applied to the hot rotary operation, it has a wide track record as a ladle opening / closing device, but due to problems such as the number of times of use, residual hot water, and adhesion of metal to the residue, the sliding surface Since foreign matter may be sufficiently mixed in between, maintenance is required, and the life of the nozzle is significantly shortened due to melting damage on the inner surface of the nozzle, and there is a concern that reliability such as malfunction may decrease.

[0006] Generally, a sliding cylinder uses a hydraulic cylinder because of its driving force and the like, but there is a problem in terms of safety, and a separate hydraulic unit is required, and another cost is required. It is also disadvantageous.

Further, in the method of opening and closing the hole from the upper side with a stopper, it is necessary to replace the stopper, for example, once every two discharges, and it is adopted as proper equipment in terms of human intervention in 3K work. I can't.

[0008]

SUMMARY OF THE INVENTION The present invention includes a discharge passage having a nozzle formed in a lower part of a tundish, a flapper for closing an outlet portion of the discharge passage, and an opening / closing mechanism for opening / closing the flapper. Is a device for discharging a residual hot water slag, which is characterized in that the discharge passage is filled with closed sand after closing.

Also, the residual hot water residue discharging device is characterized in that the discharging path of the residual hot water residue discharging device is formed so as to be inclined so as to be in a vertical direction at the time of tilting the discharging of the residual hot water residue in the tundish. A residual hot water dregs discharging device characterized in that a flapper closing mechanism is provided in the flapper closing mechanism.

Further, the residual hot water residue discharge device is characterized in that the inner peripheral end of the discharge outlet of the discharge passage of the residual hot water residue discharge device is slightly projected. In addition, in the residual hot water residue discharge device,
A residual hot water remnant discharge device, characterized in that, as a flapper opening / closing mechanism, a lower surface of the flapper is pivotally supported by a tip of a pivot arm that is pivotable by a drive mechanism.

[0011]

According to the present invention as set forth in claim 1, since the outlet of the discharge passage formed in the lower part of the tundish is closed with a flapper, the discharge passage is filled with filling sand. When discharging, the flapper is opened and the packed sand is discharged at the same time. At this time, it takes a few seconds for all the filling sand to be discharged, after which the remaining hot water residue is discharged. Therefore, when the residual molten metal residue is discharged, the flapper acts to complete the evacuation of the residual molten metal residue from the discharge passage and prevent melting damage and deformation due to molten steel.

According to the second aspect of the invention, since the discharge passage of the residual hot water residue discharging device is pre-inclined so as to be vertical when the residual hot water residual material in the tundish is tilted for discharging, the residual hot water residual material At the time of discharge, the molten steel flows down right below to prevent turbulence of the flow itself and to act to maintain a rectified flow and prevent melting damage and the like in the discharge passage.

According to the third aspect of the present invention, since the flapper closure maintaining mechanism is provided when the flapper is closed, it is possible to prevent the accidental opening of the flapper during continuous casting.

According to the fourth aspect of the present invention, the inner peripheral end of the discharge outlet of the discharge passage is slightly protruded, and when the residual slag is discharged, the metal adheres to the metal object near the discharge outlet. Prevent that.

Further, according to the invention of claim 5, in the flapper opening / closing mechanism, the lower surface of the flapper is pivotally supported by the tip of the pivoting arm pivotable by the drive mechanism.
Even if a small amount of metal adheres to the discharge outlet or drops down like a flicker, the flapper can be tilted to close the discharge outlet.

[0016]

EXAMPLES Hereinafter, examples will be described based on the present invention. FIG. 1 is a cross-sectional view of the residual hot water residue discharge device of the present invention,
2 is a sectional view taken along arrow A of FIG. 1, FIG. 3 is an enlarged sectional view taken along arrow B of FIG. 1, and FIGS. 4 and 5 are enlarged sectional explanatory views of the discharge outlet portion.

A discharge passage 2 is formed at an appropriate position such as the bottom of the tundish 1 or the lower portion of the side wall. This discharge passage 2
As shown in Fig.3, the tundish 1
Is inclined by θ, and the size of the discharge passage 2 is L
The value of / D is preferably set to 2 or more.

Here, the discharge passage 2 is inclined and L / D
This is because if the value of 2 is 2 or more, the residual hot water slag 5 flows down directly at the time of discharge, and the flow itself is rectified to prevent melting damage and the like in the discharge passage 2. It should be noted that the angle θ can be tilted by about 7 degrees to smoothly discharge the residual hot water residue 5 in the tundish 1.

Further, as shown in FIGS. 4 and 5, a projection 3 having a width of 30 to 50 mm and a height of about 20 mm is projected from the inner peripheral end of the discharge outlet of the discharge passage 2. As a result, the discharge passage 2
The formation of the metal 6 due to the residual molten metal residue 5 adhering to the metal 4 provided on the side is prevented. Furthermore, even when the residual hot water residue 5 remains at the discharge outlet and becomes a flicker,
The protrusion 3 is formed as the upper end, and the metal 4 is prevented from adhering to the metal 4.

A flapper 7 is provided to close the discharge outlet of the discharge passage 2 from below. The flapper 7 has a structure in which a refractory material is provided in a frame made of an appropriate material such as iron, and a pivot arm 8 that pivotally supports is provided in the frame on the lower surface of the flapper 7.

The rotating arm 8 has, for example, a U shape or the like, and the flapper 7 is pivotally supported at the tip thereof. The rear end of the rotating arm 8 is fixed to the shaft 9, and the transmission arm 10 at one end of the shaft 9 is rotatably connected via the bearing 12 of the air cylinder 11.

A fixing plate 13 is fixed to the other end of the shaft 9, and is provided so that the tip of the rod 15 of the air cylinder 14 abuts when the flapper 7 is closed to prevent the shaft 9 from rotating. . The air cylinders 11 and 14 are operated by remote control or wireless control.

In the operation of discharging the remaining hot water residue in the tundish 1, the tundish 1 is tilted by θ by a tilting device (not shown) so that the discharge passage 2 side of the tundish 1 is slightly lowered. Next, the air cylinder 14 on the side of the tundish 1 is shortened, the rod 15 is removed from the fixing plate 13,
The shaft 9 is rotatable. Air cylinder 1 in this state
1 is extended and the transmission arm 10 is turned to the right in FIG.
The shaft 9 pivots clockwise in FIG. 3, and the pivot arm 8 pivots clockwise accordingly. When the rotating arm 8 pivots in the clockwise direction, the flapper 7 pivotally supported at the tip of the rotating arm 8 moves downward, and the discharge outlet of the discharge passage 2 is closed.

The discharge passage 2 is filled with stuffing sand 16 made of an appropriate material such as SiO _2, but the flapper 7
Is moved downward and the closing of the discharge outlet of the discharge passage 2 is released, the stuffed sand 16 is discharged to the lower residual hot water discharge pan 17, and the residual hot water residue 5 is discharged to the residual hot water residue 5 following the stuffed sand 16. Pan 17
To discharge.

The flapper 7 is provided in the discharge passage 2 in a relatively short time.
However, since the filling sand 15 takes about one second to discharge, the flapper 7 is prevented from being covered with the residual hot water residue 5.

When the work of discharging the residual hot water slag 5 is completed, the flapper 7 is closed, the air cylinder 13 is extended, the rotation of the shaft 9 is prevented, and the filling sand 16 is filled in the discharge passage 2. Then, the next continuous casting operation is performed. In the figure, reference numerals 18 and 19 denote bearings for rotatably mounting the shaft 9 on the tundish 1, and by making loose the fit of these together with the bearing 12, expansion and contraction due to heat can be absorbed.

[0027]

The present invention, having the above-mentioned structure, has the following excellent effects. (1) Since the residual hot water residue can be treated by filling sand from the upper part of the tundish and opening and closing the flapper by remote control, the working environment can be improved.

(2) It is possible to open the discharge hole almost naturally by opening and closing the flapper, and even when the natural opening cannot be made, the thickness of the closed portion is small,
Since the oxygen opening can be performed within 1 minute, it is possible to perform the opening without damaging the discharge passage due to the oxygen cleaning.

(3) Since the discharge passage is provided in the lower part of the tundish and the residual hot water residue can be discharged by a slight tilt, a large-scale tundish tilting equipment is not required and the equipment cost can be reduced. You can

(4) Compared with the case where the sliding nozzle is diverted, the driving force at the time of opening and closing is small, the operation is possible without using a hydraulic circuit, and there is no hydraulic equipment near the heat source and the fire source. A device with improved safety can be provided.

(5) The structure is simple, hundreds of continuous operations are possible even with the number of times of opening and closing, and an extra long continuous use of the tundish such as hot rotation is also possible.

(6) The metal is unlikely to adhere to the vicinity of the discharge outlet, which is advantageous in terms of maintenance and management. In addition, even if the metal adheres, the amount of adhesion is small, so oxygen cleaning can be completed in a short time. Does not damage the discharge outlet.

(7) Further, even if some metal is attached to the vicinity of the discharge outlet, the discharge outlet can be closed by the flapper to fill the filling sand with good work efficiency.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a residual hot water residue discharge device of the present invention.

FIG. 2 is a cross-sectional view taken along arrow A in FIG.

FIG. 3 is an enlarged sectional view taken along the arrow B of FIG.

FIG. 4 is an enlarged cross-sectional explanatory view of a discharge outlet of the present invention.

FIG. 5 is an enlarged cross-sectional explanatory view when the metal is attached to the discharge outlet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tundish 2 Discharge passage 3 Projection part 4 Metal fittings 5 Remaining hot water slag 6 Ingot 7 Flapper 8 Rotating arm 9 Shaft 10 Transmission arm 11 Air cylinder 12 Bearing 13 Fixing plate 14 Air cylinder 15 Rod 16 Packed sand 17 Remaining hot water discharge pot 18 , 19 Bearing

Claims (5)

[Claims] 1. A discharge passage formed in a lower part of a tundish, a flapper for closing an outlet of the discharge passage, and an opening / closing mechanism for opening / closing the flapper, and after closing the flapper, filling sand is filled in the discharge passage. A residual hot water slag discharge device characterized by: 2. The residual hot water residue discharging device according to claim 1, wherein the discharge passage is formed so as to be tilted so as to be vertical when the residual hot water residue in the tundish is tilted for discharging. Ejection device. 3. The residual hot water residue discharging device according to claim 1, wherein the flapper closing / maintaining mechanism is provided in the flapper opening / closing mechanism. 4. The residual hot water residue discharging device according to any one of claims 1 to 3, wherein the inner peripheral end of the discharge outlet of the discharging passage is slightly projected. 5. The residual hot water slag discharging device according to claim 1, wherein the flapper opening / closing mechanism is such that a lower surface of the flapper is pivotally supported by a tip of a pivoting arm rotatable by a drive mechanism. The remaining hot water slag discharge device.