JPS63251788A - Heat-insulating material charger for vacuum slag suction facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a heat insulating material for vacuum slag suction equipment that vacuum-sucks slag floating on self-melting steel in a ladle after steel is tapped from a converter into a ladle. Regarding the feeding device.

[Prior Art] After molten steel is tapped from a converter into a ladle, molten slag on the self-molten steel in the ladle is removed by vacuum suction (VSC), and the molten steel is sometimes subjected to ladle refining.

Regarding this so-called vSC treatment target charge, in order to avoid the slag temperature decreasing and solidifying the slag, or the fluidity decreasing, an alloy charging device is installed in the ladle after tapping from the converter. We are using heat insulating materials. Also,
Before carrying the ladle into the vSC processing equipment, it is carried into a heat insulating material feeding device, and the heat insulating material is fed into the ladle from this heat insulating material feeding device.

Problems to be Solved by the Invention] However, in this prior art, at the end of suction,
When there is no heat insulating material on the hot water surface in the ladle, the fluidity of the slag decreases, and the slag no longer collects in the suction head for vacuum suction, resulting in a decrease in suction capacity.

In particular, since the suction head is disposed at the center of the ladle, there is no heat insulating material at the periphery of the ladle. If this happens, a so-called skinning phenomenon will occur on the hot water surface, making suction difficult.
Due to safety concerns, suction has no choice but to be discontinued.

If the heat insulating material runs out and suction is no longer possible, the ladle is transported to the heat insulating material feeding device again, the heat insulating material is re-injected, and then vSC is restarted. Therefore, loss time increases and the temperature of the molten metal decreases significantly.

This invention was made in view of such circumstances, and
We have developed a heat insulating material feeding device for vacuum suction equipment that allows the heat insulating material to be injected into the ladle in parallel with the vacuum suction operation, and enables smooth vacuum suction of the slag in the ladle. The purpose is to provide.

[Means for Solving the Problems] A heat insulating material feeding device for vacuum slag suction equipment according to the present invention has a hopper in which heat insulating material is stored and a turning center provided at the center of the ladle. A rotating chute whose input end rotates on a predetermined circumference centered on the rotation center, and a supply means that connects the hopper and the rotating chute to cut out heat insulating material from the hopper and supply it to the rotating chute, The rotating chute is characterized in that it rotates around a vacuum suction head placed at the center of the ladle while feeding the heat insulating material.

[Function] In the present invention, a suction head for vacuum suction is installed at the center of a ladle installed in a vacuum suction equipment. Then, the rotating chute moves on the circumference of a circle having a predetermined radius centered on a position aligned with this head (the installation center of the ladle). The heat insulating material cut out from the hopper is supplied to the swing chute via a supply means, and the swing chute throws the heat insulating material onto the ladle-shaped molten steel during this swing movement. In this way, the heat insulating material is always supplied on the hot water surface at the peripheral edge of the ladle, and the appearance of a hot water surface area that is not covered with the heat insulating material is avoided. This suppresses a decrease in the fluidity of the slag, so that vacuum suction processing can be performed smoothly and quickly.

[Embodiments] Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a sectional view showing an embodiment of the invention. Molten steel 2 is tapped into the ladle 1 from a converter. A converter slag 3 is floating on the molten steel 2, and a heat insulating material 4 is put into the ladle 1 during and/or after tapping the converter, and is floating on the molten slag 3.

This ladle 1 is carried into a vacuum slag suction (VSC) treatment facility by a truck (not shown) or the like, as shown in FIG. 1, and installed at a predetermined position.

A suction head 5 is installed in an area directly above the center of the ladle 1, and this suction head 5 is connected to a suitable suction means (not shown).

Furthermore, the suction head 5 can be lowered as shown by the arrow by appropriate support means (not shown).
Thereby, it can be located near the hot water level in the ladle 1.

Protective plate 7
extends horizontally, and this protective plate 7 is arranged above the ladle 1. A swing drive device 8 is installed on the protection plate 7 at a position aligned with the center of the ladle 1.

A cylindrical rotating chute 12 is attached to this drive device 9, and the chute 12 extends downward through a hole 11 provided in the protection plate 7. This chute 12 has hole 1
1, and a pivot portion 14 extending vertically downward at a position spaced apart horizontally by a predetermined distance from the pivot center. The center portion 13 and the rotating portion 14 are connected by a connecting portion extending diagonally downward, and when the center portion 13 of the chute 12 is rotated by the motor 10 of the drive device 9, the rotating portion 14 rotates at a predetermined position around the center portion 13. Rotate in radius.

A hopper 15 in which heat insulating material is stored is installed on the protection plate 8.
6, the material is cut out at a predetermined cutting speed. A screw conveyor 17 is arranged between the rotary feeder 16 and the drive device 9. This screw conveyor 17 conveys the heat insulating material cut out by the rotary feeder 16 to the turning center 13 of the chute 12.

According to the apparatus configured in this way, after the molten steel 2 is tapped from the converter into the ladle 1, the heat insulating material 4 is thrown onto the slag 3 in the ladle 1 in the same manner as in the past. Next, take #Al is the first
As shown in the figure, it is carried into the vSC processing facility.

Then, the suction head 5 descends and stops directly above the hot water level in the ladle 1 (for example, at a position 70 to 80III1 above the hot water level). Then, via the head 5, the ladle 1
The slag 3 inside is sucked and removed from the surface of the molten metal.

By this vSC processing, the heat insulating material 4 inside the ladle 1 is also attracted, and the heat insulating material 4 at the periphery of the ladle is drawn toward the center. Then, the heat insulating material is cut out from the hopper 15 by the rotary feeder 16 at a predetermined speed, and is supplied to the rotating chute 12 by the screw conveyor 17. The rotating part 14 of the rotating chute 12 is reciprocated and rotated around the head 5 by the motor 10 of the drive device 9, and the heat insulating material is
The liquid is thrown into the peripheral portion of the ladle 1 via the rotating portion 14 of the rotating chute 12. Therefore, the hot water surface of the ladle 1 is always covered with the heat insulating material 4 during the VSC treatment. Therefore, a decrease in the temperature of the molten slag 3 in the drawer w41 is avoided, and its fluidity does not decrease.

Therefore, the slag 3 in the ladle 1 is smoothly suctioned by the head 5, and the vS
C processing is performed.

Note that, of course, the present invention is not limited to the above embodiments. For example, the heat insulating material may be supplied to the chute 12 not by the screw conveyor 17 but by means such as air conveyance. In this case, the connecting portion of the chute 12 (between the center portion 13 and the rotating portion 14) may be made horizontal.

[Effects of the Invention] According to the present invention, during vacuum suction, the heat insulating material can be added at any timing in parallel with this suction.

As a result, the temperature drop of the slag is suppressed and the fluidity of the slag is not reduced, so that the slag suction ability is improved, the slag can be quickly removed, and the suction time is shortened. Furthermore, slag within the ladle can be almost completely eliminated without the occurrence of skin burrs on the peripheral edge of the ladle, unlike in the prior art.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the invention. 1; Ladle, 2; Molten steel, 3; Slag, 5; Suction head, 12; Rotating chute, 15; Hopper, 17; Screw conveyor

Claims (1)

[Claims] a hopper in which a heat insulating material is stored; a rotating chute having a rotation center provided at the center of the ladle, the input end of which rotates on a predetermined circumference around the rotation center; a supply means connected to the rotating chute to cut out the heat insulating material from the hopper and supplying the heat insulating material to the rotating chute; A heat insulating material feeding device for vacuum slag suction equipment that is characterized by rotating.