JP2704817B2 - Hot water residue discharge device - Google Patents

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 residual metal residue, which is essential for continuous use of a tundish used for continuous steelmaking casting.

[0002]

2. Description of the Related Art Conventionally, as a technique for discharging a residue of a tundish which is continuously used in steelmaking continuous casting, an example in which an overflow hole is provided at the end of the tundish or on the upper side of a side of the tundish without an opening / closing device is known. In addition, the remaining hot metal residue is discharged by tilting the tundish by 90 degrees.

Further, as an example having an opening / closing device, a discharge hole is provided at the bottom of the tundish, and this hole is formed by using one or two sliding nozzles, or by opening and closing the hole from above using a stutter. Some examples have been implemented.

[0004]

Conventionally, as a technique for discharging the remaining hot water residue, in a technique without an opening / closing device, the remaining hot water residue is discharged by tilting the tundish by 90 degrees. However, in this method, equipment for tilting the tundish by 90 degrees is required, and maintenance or installation of a sealing material is required every time by using a hole that is always open. There was a problem of human intervention in the work.

[0005] Further, in the case of using a sliding nozzle as an example having an opening / closing device, the target is to employ a continuous use of a tundish such as a continuous casting of different types. However, this sliding nozzle can withstand several times of opening and closing, but in the hot rotary operation of continuous casting, it is required to use the same tundish several hundred times, for example, 800 times. Therefore, when the above-mentioned sliding nozzle is directly applied to the hot rotary operation, it is widely used as a ladle opening / closing device. Care must be taken because foreign matters are sufficiently mixed in between, and the life is significantly shortened due to erosion of the inner surface of the nozzle or the like, and there is a concern that the reliability such as malfunction may decrease.

In general, a sliding nozzle uses a hydraulic cylinder in terms of driving force and the like. However, there is a problem in terms of safety, and a cost is required because a hydraulic unit is required separately and the cost is required separately. Also disadvantageous.

Further, in the method in which the hole is opened and closed from above by means of a stopper, replacement of the stopper requires, for example, one replacement for every two discharges, and is adopted as a propeller facility in terms of human intervention in 3K work. Can not do.

[0008]

According to the first aspect of the present invention,
It has a discharge passage formed in the lower part of the tundish, a flapper for closing an outlet of the discharge passage, and an opening and closing mechanism for opening and closing the flapper. The opening and closing mechanism has a rotating arm that can be rotated by a driving mechanism. An apparatus for discharging residual metal residue, characterized in that the lower surface of the flapper is pivotally supported at the tip of the rotating arm so as to be swingable, and after the flapper is closed, filling sand is filled in the discharge passage.

Further, the invention according to claim 2 has a discharge passage formed in the lower part of the tundish, a flapper for closing an outlet of the discharge passage, and an opening and closing mechanism for opening and closing the flapper, and the flapper is closed. A remaining hot metal residue discharging device for filling filling sand into a discharging passage, wherein the discharging passage is formed to be inclined so as to be vertical when discharging and tilting the remaining hot metal residue in the tundesh. It is.

[0010]

According to the present invention, since the outlet of the discharge passage formed in the lower part of the tundish is closed with the flapper and then filled into the discharge passage with the stuffing sand, the flapper discharges the residual hot water residue. The sand is discharged at the same time as the sand is released. At this time, it takes several seconds until all the stuffing sand is discharged, after which the remaining hot metal residue is discharged. Therefore, when the residual hot metal residue is discharged, the flapper has completed retreating from the residual hot metal residue discharge flow path, so that the flapper can be prevented from being melted and deformed by molten steel.

Furthermore, the opening / closing mechanism has a rotating arm rotatably by a driving mechanism, and the lower end of the flapper is pivotally supported at the tip of the rotating arm so as to swing. With such a configuration, the discharge outlet can be closed by inclining the flapper even if the base metal slightly adheres to the discharge outlet or falls down in a icy manner.

According to the second aspect of the present invention, since the discharge passage of the residual hot metal residue discharge device is formed to be inclined in advance so as to be vertical when the residual hot metal residue in the tundish is tilted for discharge, the residual liquid is formed. When the molten metal is discharged, the molten steel flows down directly below, preventing turbulence of the flow itself, acting to maintain a rectified flow, preventing melting and the like in the discharge passage, and discharging the residual molten metal residue. Is discharged vertically, the adhesion of the metal to the outlet of the discharge passage can be reduced.

[0013]

[0014]

[0015]

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. FIG. 1 is a sectional view of a residual hot water residue discharge device of the present invention,
FIG. 2 is a cross-sectional view taken along the arrow A in FIG. 1, FIG. 3 is an enlarged cross-sectional view taken along the arrow B in FIG. 1, and FIGS. 4 and 5 are enlarged cross-sectional explanatory views of the discharge outlet.

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, a tundish 1
And the size of the discharge passage 2 is L
The value of / D is preferably set to 2 or more.

Here, the inclination of the discharge passage 2 and the L / D
If the value of is set to 2 or more, the residual hot water residue 5 will flow down immediately below at the time of discharge, the flow itself will be rectified, and the melting and the like in the discharge passage 2 will be prevented. Note that the inclination of the angle θ is about 7 degrees, so that the remaining hot water residue 5 in the tundish 1 can be smoothly discharged.

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. Thereby, the discharge passage 2
The formation of the base metal 6 due to the remaining hot metal residue 5 adhering to the metal object 4 provided on the side is prevented. Furthermore, even in the case where the residual hot water residue 5 remains at the discharge outlet and becomes
The protrusion 3 is formed with the upper end thereof, so that the metal 6 is prevented from adhering to the hardware 4.

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

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

A fixed 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 operation of the air cylinders 11 and 14 is performed by remote control or wireless control.

In the operation of discharging the residual hot metal 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 provided on the side of the tundish 1 is shortened, and the rod 15 is removed from the fixing plate 13.
The shaft 9 is made rotatable. In this state, the air cylinder 1
1 is extended, and the transmission arm 10 is turned rightward in FIG.
The shaft 9 rotates clockwise in FIG. 3, and accordingly, the rotating arm 8 also rotates clockwise. When the rotating arm 8 rotates clockwise, the flapper 7 pivotally supported at the tip thereof moves downward to release the discharge outlet of the discharge passage 2 from closing.

The discharge passage 2 is filled with sand 16 made of a suitable material such as SiO _2.
Moves downward and the discharge outlet of the discharge passage 2 is closed, and then the stuffed sand 16 is discharged to the lower hot water discharge pan 17 below, and the remaining hot metal residue 5 is discharged following the stuffed sand 16. Pot 17
To be discharged.

The flapper 7 discharges the discharge passage 2 in a relatively short time.
Is opened, but since the filling sand 15 takes about one second to discharge, the residual hot metal residue 5 is prevented from being applied to the flapper 7.

When the operation of discharging the residual hot water residue 5 is completed, the operation of closing the flapper 7 and extending the air cylinder 13 to prevent the rotation of the shaft 9 and filling the filling passage 16 with the filling sand 16 is performed. Then, the next continuous casting operation is performed. Reference numerals 18 and 19 in the drawing denote bearing portions for rotatably attaching the shaft 9 to the tundish 1. The fittings are loosened together with the bearing 12 so that expansion and contraction due to heat can be absorbed.

[0027]

According to the present invention having the above-described structure, the following excellent effects can be obtained. (1) Since the residual hot water residue treatment can be performed by filling sand from the top of the tundish and opening and closing the flapper by remote control or the like, it is possible to improve the working environment.

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

(3) Since the discharge passage is provided at the lower part of the tundish, and the remaining hot metal residue can be discharged with a slight tilt, a large-scale tundish tilting equipment is not required, and the equipment cost is reduced. I can do it.

(4) Compared to the case where the sliding nozzle is diverted, the driving force at the time of opening and closing can be reduced, the operation can be performed 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, and several hundreds of continuous uses are possible even in the number of times of opening and closing, and an extra long continuous use of a tundish such as hot rotation is also possible.

(6) The configuration is such that the metal does not easily adhere to the vicinity of the discharge outlet, which is advantageous in terms of maintenance and management. In addition, even if the metal is attached, the amount of the metal is small, so that oxygen cleaning can be performed in a short time. No damage to the outlet.

(7) Even if some metal adheres to the vicinity of the discharge outlet, the discharge outlet can be closed with the flapper to fill the packing sand, and the working efficiency is good.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken in the direction of arrow A in FIG.

FIG. 3 is an enlarged cross-sectional view as viewed from an arrow B in FIG. 1;

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

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tundish 2 discharge passage 3 projecting part 4 hardware 5 residual hot metal residue 6 bullion 7 flapper 8 rotating arm 9 shaft 10 transmission arm 11 air cylinder 12 bearing 13 fixing plate 14 air cylinder 15 rod 16 filling sand 17 residual hot water discharge pot 18 , 19 Bearing

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-17218 (JP, A) JP-A-3-210948 (JP, A) Jpn.

Claims (2)

(57) [Claims] 1. A discharge passage formed in a lower portion of a tundish, a flapper for closing an outlet of the discharge passage, and an opening and closing mechanism for opening and closing the flapper, the opening and closing mechanism being rotatable by a driving mechanism. An apparatus for discharging residual metal residue, characterized in that the apparatus has a rotating arm, the lower end of the rotating arm pivotally supports the lower surface of the flapper, and after closing the flapper, fills the discharge passage with filling sand. 2. A discharge passage formed in a lower portion of the tundish, a flapper for closing an outlet of the discharge passage, and an opening / closing mechanism for opening and closing the flapper. An apparatus for discharging residual hot metal residue, wherein the discharge passage is inclined so as to be vertical when the residual hot metal residue in the tundish is tilted.