JPH05200534A - Equipment for discharging packed sand from ladle tap hole - Google Patents

Abstract

(57) [Summary] [Purpose] Molten steel containing stuffed sand discharged from the ladle tap hole is discharged outside the system without being injected into the tundish, and rapidly cooled and solidified. [Composition] A water-cooled mold 5 which is open vertically is installed along the moving path of the ladle 1 mounted on the swing tower 13.
The dummy block 6 is mounted below the. The sliding nozzle device 2 of the ladle 1 is opened, and the molten steel 3 containing the filling sand filled in the ladle tapping opening is received in the water-cooled mold 5 and rapidly cooled. When the molten steel 3 is solidified into a steel ingot 4, the elevating device 7 is driven to draw out the steel ingot on the dummy block 6, and then the steel ingot dispensing device 8 dispenses the steel ingot 4 to the container 9.

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 packed sand from a ladle tapping opening used in a continuous casting apparatus or the like.

[0002]

2. Description of the Related Art Normally, molten steel is transferred from a ladle equipped with a tap hole and a sliding nozzle device at the bottom to a tundish.
In order to prevent the initial blockage of the tapping port 16 when pouring, the sliding nozzle device 2 is closed prior to the steel receiving to the ladle 1 and the filling port 17 such as silica sand is filled in the tapping port 16 as shown in FIG. Is filled in advance to improve the opening rate of the sliding nozzle device 2. In the conventional continuous casting machine, ladle 1
After receiving the steel, the ladle 1 was moved onto the tundish, the sliding nozzle device 2 was opened, and the filling sand 17 was poured into the tundish together with the molten steel 18. For this reason, the filling sand injected into the tundish is cast into the mold as it is, so that non-metallic inclusions in the initial slab increase and cause internal defects.

After receiving the steel in the ladle 1 in order to prevent the filling sand from entering the tundish, the sliding nozzle device 2 of the ladle 1 is opened outside the tundish at the time of tapping to quickly remove the molten steel containing the filling sand. A method is known in which, after being discharged into a container made of cast steel or cast iron, the sliding nozzle device 2 is immediately closed and moved onto the tundish, and then the sliding nozzle device 2 is opened again to start pouring molten steel into the tundish. ..

As a means of this kind, for example, JP-A-56-111
In No. 63 publication, a discharge gutter is movably provided within a range where the ladle moves to a predetermined tundish pouring position, and while the ladle is moved to the tundish pouring position, the stuffed sand at the tapping mouth is shed with molten steel. A method has been proposed in which stuffing sand is not mixed into the tundish by discharging it.

[0005]

In the method of discharging molten steel containing packed sand into a container made of cast steel or cast iron before pouring from a ladle into a tundish, the container is exposed to the molten steel and the inner surface temperature rises. However, there is a problem that the container is deformed or melted. Furthermore, the temperature of the container rises, and the discharged stuffing sand cannot solidify by the time when the next lading sand is discharged.
There was a problem that it hindered the discharge of packed sand in the next ladle.

According to the method proposed in the above publication, it is possible to prevent the filling sand from being mixed with the molten steel in the tundish. However, a driving gutter for moving the ladle that follows the moving range of the ladle is provided. Equipment was required, and there were problems in increasing equipment costs, securing occupied work space, and processing splash (scattered metal) generated on the gutter. The present invention has been made in view of the above circumstances, and is capable of quickly cooling molten steel containing stuffing sand and easily processing a steel ingot containing solidified stuffing sand. It is an object of the present invention to provide a packed sand discharge processing device.

[0007]

DISCLOSURE OF THE INVENTION The present invention for achieving the above object is a device for discharging packed sand from a ladle tapping opening, which is on the way of moving a ladle mounted on a ladle moving device. , A water-cooled mold that is opened up and down to receive molten steel containing stuffed sand discharged from the ladle tapping hole, a dummy block that is installed from below in this water-cooled mold, and a lift for moving this dummy block. The apparatus is characterized by comprising an apparatus and a steel ingot dispensing apparatus for removing the steel ingot containing the stuffed sand placed on the dummy block taken out from the water-cooled mold from the dummy block.

[0008]

[Operation] The structure of the present invention will be described with reference to FIGS. In the present invention, as shown in FIG. 1, from the position where the ladle 1 is mounted on the swing tower 13 which is the ladle moving device (on the right side of FIG. 1), the ladle 1 is at the molten steel pouring position (see FIG. 1). In the middle of the ladle moving path to the left side), below the pouring hole of the sliding nozzle device 2 attached to the lower part of the ladle 1, a water-cooled mold 5 that is open vertically is arranged to receive molten steel mixed with filling sand.

A dummy block 6 is mounted from below in a water-cooled mold 5 that is open at the top and bottom so that molten steel containing stuffed sand can be received without leaking steel. A vertical guide rod 15 is fixed to a lower portion of the dummy block 6, and the dummy block 6 is moved up and down by moving the vertical guide rod 15 up and down by a dummy block elevating device 7. The solidified ingot in the water-cooled mold 5 is taken out by the dummy block lifting device 7. In the vicinity of the dummy block elevating device 7, a steel ingot dispensing device 8 for removing the steel ingot from the dummy block 6 and a container 9 for putting the steel ingot are arranged.

As shown in FIG. 2, the water-cooled mold 5 includes a copper plate 10 having grooves in which cooling water flows and a back plate for supporting the copper plate 10.
Formed from 11. The cooling capacity of the water-cooled mold 5 is determined by the amount of molten steel discharged and the molten steel injection pitch from the ladle, since it is necessary to complete the solidification of the molten steel containing the discharged sand to be discharged by the next ladle. It The shape of the water-cooled mold is adapted to the treatment method of the solidified steel ingot.

The discharging speed of the molten steel discharged from the sliding nozzle device 2 and containing the filling sand filled in the tap hole of the ladle 1 depends on the molten steel head in the ladle, but collides with the dummy block 6 or the solidified ingot. Splash is generated at this time, so it is desirable to cover the splash cover 12 on the water-cooled mold 5. Next, the operation of the present invention will be described.

When the molten steel has been poured from the ladle 1 mounted on the swing tower 13 at the pouring position into the tundish 14 into the tundish 14, the ladle 1 waiting on the opposite side is completed.
The swing tower 13 is driven to rotate and stopped on the water-cooled mold 5. In this state, the sliding nozzle device 2 is operated to open the tap hole 16 (see FIG. 3), and the filling sand 17 is discharged from the tap hole 16 into the water-cooled mold 5. At this time, molten steel in the vicinity is discharged together with the filling sand 17 into the water-cooled mold 5, but a few seconds after observing the time when the discharging of the filling sand 17 is completed, the sliding nozzle device 2 is immediately moved to move the tapping mouth. Close 16 Continue to rotate the swing tower 13 to move the ladle 1 to the pouring position to the tundish 14, then open the sliding nozzle device 2 to start the tundish from the ladle 1.
Molten steel injection into 14 is started. By doing so, the filling sand in the ladle tap hole can be discharged to the outside of the system without being mixed in the tundish.

On the other hand, the molten steel 3 containing the filling sand discharged from the tapping port 6 of the ladle 1 into the water-cooled mold 5 is rapidly cooled and solidified into a steel ingot 4. In this way, when the molten steel 3 is completely converted into the steel ingot 4 by cooling in the water-cooled mold 5, the dummy block elevating device 7 is driven to lower the dummy block 6 integrally with the vertical guide rods 15, 4 is pulled downward from the water-cooled mold 5. Steel ingot 4 on the dummy block 6
When is lowered to the front of the cylinder type steel ingot dispensing device 8, the lifting device 7 is stopped. Subsequently, the cylinder type steel ingot dispensing device 8 is driven to dispense the steel ingot 4 on the dummy block 6 into a container 9 which can be easily handled by the transportation vehicle. The dummy block elevating device 7 is driven again to mount the dummy block 6 from below the water-cooled mold 5 to prepare for discharging the packed sand from the next ladle.

[0014]

[Example] In a continuous casting apparatus in which a pouring pitch of a ladle was about 30 minutes, the packed sand discharge treatment apparatus of the present invention shown in FIG. 1 was installed in the middle of turning of a swing tower. The shape of the water-cooled mold is 5
00mm × 500mm, mold height is 1000mm. About 1t of molten steel containing filling sand is discharged into the water-cooled mold before pouring the tundish from the pot of every chance and solidified by raising and lowering the dummy block for every 2ch pot. The steel ingot was discharged.

As a result, it has become possible to manufacture slabs having almost the same level of quality, although the quality of the slabs at the initial stage of pouring was inferior to the quality at the middle stage of pouring.

[0016]

According to the present invention, since the filling sand filled in the tap hole of the ladle can be discharged outside the tundish, the quality of the slab at the initial stage of pouring the ladle can be improved. Further, since the molten steel containing the discharged packed sand is rapidly cooled by indirect water cooling in the water-cooled mold, it is possible to deal with it with a margin even when the pouring pitch of the ladle is short.

[Brief description of drawings]

FIG. 1 is a side view showing the apparatus of the present invention in a partial cross section.

FIG. 2 is a side view showing an arrow AA of FIG.

FIG. 3 is a side view showing a state of filling sand in a ladle tap hole.

[Explanation of symbols]

 1 Ladle 2 Sliding Nozzle Device 3 Molten Steel Containing Filled Sand 4 Steel Ingot 5 Water Cooled Mold 6 Dummy Block 7 Dummy Block Lifting Device 8 Steel Ingot Discharging Device 9 Container 10 Copper Plate with Cooling Water Groove 11 Copper Plate Support Back Plate 12 Splash Cover 13 Swing Tower 14 Tundish 15 Vertical guide rod 16 Steel tap 17 Filled sand 18 Molten steel

Claims (1)

[Claims] 1. A device for discharging stuffed sand from a ladle tap hole, which is installed on the moving path of a ladle mounted on a ladle moving device and contains molten sand from the ladle tap port. A water-cooled mold that is open and closed to receive the water, a dummy block that is mounted from below in the water-cooled mold, an elevating device for moving the dummy block, and stuffing sand placed on the dummy block that is taken out from the water-cooled mold. An apparatus for discharging stuffed sand from a ladle tap hole, comprising a steel ingot discharging device for removing the ingot containing steel from a dummy block.