JP5245322B2 - Ladle refining equipment sealing method and sealing device - Google Patents

Description

  The present invention relates to a sealing method and a sealing device for preventing air from entering the ladle through a gap between a ladle and a lid during molten steel treatment in the ladle.

  The LF treatment for the purpose of reducing oxide (oxycide) inclusions is performed using an electrode heating apparatus in an inert gas atmosphere in order to avoid reoxidation due to oxygen in the atmosphere.

  In LF treatment, dust-containing gases such as fumes generated by heating between the electrode and the molten metal surface, and a large amount of dust-containing gas generated due to a violent reaction when a component adjustment material is dropped on the molten metal surface are sucked in. When the dust is collected and the draft force generated by warming the inert gas on the high-temperature molten steel increases the risk of air pick-up and nitrogen pickup.

  FIG. 4 is a diagram for explaining the structure of a ladle using an electrode heating device, in which a ladle 9 charged with molten steel 10 is loaded on a self-propelled carriage 13 and moved to a processing position and stopped. The water-cooled lid 7 is lowered by an elevating device (not shown), and the pot mouth is covered.

The dust collection hood 3 is fixed to a water-cooled lid 7 via a cylindrical member 6. Duct 4 is mounted on the dust collection hood 3 is sucked dirty gas 5 in pot via the duct 4 as shown by arrow to a dust collector (not shown).

  Moreover, the heating electrode 1 composed of a plurality of electrodes is lowered to a fixed position by the electrode support device 2 and subjected to secondary refining.

  In the case of ladle refining using the ladle described above, when the generated dust-containing gas 5 is sucked into the dust collector through the duct 4, the inside of the ladle becomes a negative pressure. 1. Gap between the dust collection hood 3 and the electrode 1 It occurs between the ladle 9 and the water-cooled lid 7 due to distortion of the pot mouth, distortion of the water-cooled lid 7, and adhesion of bullion or slag to the pan-mouth.

  Among these, since the case 1 is isolated by the water-cooled lid 7, the molten steel 10 and the nitrogen in the air do not react to cause a nitrogen pickup, and the nitrogen concentration in the molten steel does not increase.

  However, 2. In the case of the ladle 9 and the water-cooled lid 7, it is close to the hot water surface 11, and when air is mixed in, nitrogen pickup occurs, making it difficult to melt low-nitrogen steel.

  Note that a large amount of air sucked from the gap between the water-cooled lid 7 and the ladle 9 is caused by the draft force generated when the inert gas is warmed on the hot molten steel 10, or the water-cooled lid 7 and the ladle 9. The draft force generated by the height difference between the gap and the gap around the electrode support device 2 which is the upper part of the water-cooled lid 7 is also a factor.

Therefore, various techniques for closing the gap between the ladle 9 and the water-cooled lid 7 have been proposed (for example, Patent Documents 1 and 2), and in actual operation, as shown in FIG. The gap is sealed with a sealing plastic material 19, or an inert gas passage 20 is provided in the main body of the water-cooled lid 7 as shown in FIG. 6 to inject the inert gas into the gap 8. ing.
Japanese Patent Laid-Open No. 8-105692 JP-A-9-105584

  However, the use of the sealing plastic material 19 that seals between the ladle 9 and the water-cooled lid 7 involves dangerous work near the hot molten steel 10, and the main body of the water-cooled lid 7 as shown in FIG. Providing the inert gas passage 20 in the structure complicates the lid structure.

  In addition, the use of the sealing plasticizer 19 and the injection of the inert gas into the gap 8 have a large operating cost.

  Therefore, an object of the present invention is to provide a sealing method and a sealing device for a ladle refining facility that solve the above-described problems without using a consumable material such as a sealing plasticizer 19 or an inert gas.

The object of the present invention can be achieved by the following means.
1. A sealing method that covers the joint between the ladle and the pan lid, fitting the ring-shaped member attached along the outer periphery of the pan lid to the ring-like member attached along the outer periphery on the upper end side of the ladle. In addition, either the ring-shaped member mounted along the outer periphery of the pan lid or the ring-shaped member mounted along the outer periphery on the upper end side of the ladle makes a wedge that forms an acute angle in the fitting direction. In the case of a ring-shaped member mounted along the outer periphery of the pan lid, the other is vertically extended toward the lower side and mounted along the outer periphery on the upper end side of the ladle. In the case of a ring-shaped member, the ring-shaped member extends vertically and is fitted to the outside of the ring-shaped member having the wedge-shaped cross section so as to cover the outer periphery of the joint portion between the ladle and the pan lid. A sealing method that covers the joint between the ladle and the lid.
2. Between the ladle and the pan lid, a seal ring on which the pan lid is placed in close contact is disposed. A sealing method for covering a joint portion between a ladle and a pan lid to fit a ring-shaped member mounted along the outer periphery of the side, wherein the ring-shaped member mounted along the outer periphery of the seal ring or the Either one of the ring-shaped members mounted along the outer periphery on the upper end side of the pan has a wedge-shaped cross section forming an acute angle in the fitting direction, and the other is mounted along the outer periphery of the seal ring. In the case of a ring-shaped member, it extends in the vertical direction downward, and in the case of a ring-shaped member attached along the outer periphery on the upper end side of the ladle, it extends in the vertical direction upward, and the ladle So that it covers the outer periphery of the joint of the seal ring. Sealing method for covering the joint portion of the ladle and Nabefuta, characterized in that fitted to the outside of the beauty-shaped cross section of the ring-shaped member.
3. A sealing device that covers a joining portion of a ladle and a pan lid, wherein the sealing device is attached along an outer periphery of a ring-shaped member attached along an outer periphery of the pan lid or an upper end side of the ladle One of the ring-shaped members has a wedge-shaped cross section forming an acute angle in the fitting direction, and the other is a vertical direction toward the lower side in the case of the ring-shaped member mounted along the outer periphery of the pan lid In the case of a ring-shaped member attached along the outer periphery on the upper end side of the ladle, it is stretched in the vertical direction upward so as to cover the outer periphery of the joint between the ladle and the pan lid A sealing device for covering a joint portion of a ladle and a pan lid, which is fitted to the outside of the ring-shaped member having the wedge-shaped cross section.
4). Between the ladle and the pan lid, a seal ring on which the pan lid is placed in close contact is disposed. The ladle has a ring-shaped member mounted along the outer periphery on the upper end side thereof, and a ladle-pan lid joint for fitting the ring-shaped member of the seal ring and the ring-shaped member of the ladle A wedge-shaped cross section in which either one of the ring-shaped member of the seal ring or the ring-shaped member mounted along the outer periphery of the upper end side of the ladle forms an acute angle. In the case of a ring-shaped member mounted along the outer periphery of the seal ring, the other is a ring-shaped member that extends vertically downward and is mounted along the outer periphery on the upper end side of the ladle. In the case of a member, it extends in the vertical direction upward, Serial ladle and sealing device covering the junction of the ladle and Nabefuta, characterized in that fitted on the outside of the wedge-shaped cross section of the ring-shaped member so as to cover the outer periphery of the joint portion of the sealing ring.

  According to the present invention, during ladle refining, it is a safe operation and has a low operating cost, closes the gap between the ladle and the pan lid, and can prevent the suction of the atmosphere, which is extremely useful industrially. It is.

  The present invention is characterized in that the gap formed at the joint between the ladle and the lid is closed by fitting a ring-shaped member disposed on the outer peripheral side of the ladle and the lid, and the inside of the ladle is blocked from the atmosphere. Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a partial cross-sectional view of a joining portion of a ladle and a pan lid, illustrating a sealing device according to an embodiment of the present invention. In the figure, 7 is a pan lid (including a water-cooled lid), and 9 is a ladle. Reference numeral 10 denotes molten steel, 14 denotes a ring-shaped member attached to the pan lid 7, 15 denotes a ring-like member attached to the ladle 9, and 16 denotes a metal bar or slag attached to the upper end of the ladle 9.

  The illustrated sealing device has a ring-shaped member 14 attached along the outer periphery at the lower end of the pan lid 7 and a ring-shaped member 15 attached along the outer periphery on the upper end side of the ladle 9. The ring-shaped member 14 mounted on the pan lid 7 and the ring-shaped member 15 mounted on the ladle 9 are not particularly limited as long as they have a cross-sectional shape that does not cause a gap when fitted. It is desirable to have a wedge shape and the other has a rectangular cross section. FIG. 1 shows a case where the ring-shaped member 14 has a rectangular cross section and the ring-shaped member 15 has a wedge-shaped cross section.

  The ring-shaped member 14 having a rectangular cross section is fixed by welding or bolt connection so as to extend in the vertical direction toward the lower side of the pan lid 7 along the outer periphery at the lower end of the pan lid 7 and integrated with the pan lid 7. Let

  On the other hand, the ring-shaped member 15 having a wedge-shaped cross section is fixed by welding or bolting along the outer periphery on the upper end side of the ladle 9 so as to form an acute angle upward of the ladle 9, and is integrated with the ladle 9. Make it.

  The inner diameter of the ring-shaped member 14 having a rectangular cross section and the taper angle of the ring-shaped member 15 having a wedge-shaped cross section (the angle of the front end portion of the wedge) so that the pan lid 7 can be fitted and placed on the ladle 9. Set as appropriate.

As described above, when the inner diameter of the ring-shaped member 14 having a rectangular cross section and the taper angle of the ring-shaped member 15 having a wedge-shaped cross section (angle of the tip of the wedge) are set, the pan lid 7 is placed on the ladle 9. At this time, even if a metal bar or slag 16 due to the splash of molten steel 10 adheres to the upper end portion of the ladle 9 or a gap generated by the deformation of the pan lid 7 occurs at the joint portion, the joint portion is a ring having a rectangular cross section. since it covered from the outside by Jo member 14 and the ring-shaped member 15 of the wedge-shaped cross section, the molten steel 10 in the ladle 9 it is blocked from the atmosphere.

  In the case of a ladle refining facility in which the ladle is moved below the pan lid suspended by the lifting device and the pan lid 7 is placed thereon, when the pan lid 7 is lowered toward the pan 9, the pan lid 7 A ring-shaped member 14 having a rectangular cross section attached to the ring is fitted into a ring-shaped member 15 having a wedge-shaped cross section, thereby blocking the inside of the ladle from the atmosphere.

  In addition, the lower end part of the pan lid 7 is processed into the same shape as when the ring-shaped member 14 is attached, or the upper end part of the ladle 9 is processed into the same shape as the case where the ring-shaped member 15 having a wedge-shaped cross section is attached. It may be processed. Further, instead of the ring-shaped member 15 having a wedge-shaped cross section, an umbrella-shaped member having a wedge-shaped cross section may be used.

  3A and 3B are views for explaining a sealing device according to another embodiment of the present invention, wherein FIG. 3A is a top view and FIG. 3B is a side view. In the figure, 17 is a seal ring, and 18 is a jig for suspending the seal ring 17.

  The illustrated sealing device includes a ring member 15 having a wedge-shaped cross section that is mounted along the outer periphery of the upper end side of the seal ring 17 and the ladle 9.

  A ring-shaped member 14 having a rectangular cross section is attached to the outer periphery of the seal ring 17, and a hanging jig 18 is attached to the outer peripheral surface of the ring-shaped member 14 having a rectangular cross section so as to face each other with the ring-shaped member 14 having a rectangular cross section interposed therebetween. ing. In FIG. 2, the junction part which has arrange | positioned the sealing apparatus shown in FIG. 3 between the ladle and the pan lid is shown.

  In the case of using the illustrated sealing device, first, the ladle 9 is loaded on the carriage, the wedge-shaped member 15 is fitted to the ladle 9 with an overhead crane, and then the seal ring 17 is removed with the overhead crane. It is made to fit in the wedge-shaped member 15 attached to.

  Thereafter, the cart on which the ladle 9 is placed is moved to a position directly below the overhead crane on which the pan lid 7 is suspended, and the pan lid 7 is placed on the seal ring 17.

  Since the pot lid 7 is placed on the upper surface of the seal ring 17 having a flat surface, the lifting stroke amount may be small as compared with the case where the ring-shaped member 14 is attached to the pot lid 7, and the work efficiency is improved. When the ring-shaped member 14 is attached to the pan lid 7, a lifting stroke amount for separating the ring-shaped member 14 from the ring-shaped member 15 having a wedge-shaped cross section is required.

The figure which shows the junction part of the ladle and pan lid using one Example which concerns on this invention. The figure which shows the junction part of the ladle and pan lid using the other Example of this invention. Another embodiment of the present invention. Conventional example. Conventional example. Conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating electrode 2 Electrode support apparatus 3 Dust collection hood 4 Duct 5 Dust containing gas 6 Cylindrical member 7 Pan lid 8 Crevice 9 Ladle 10 Molten steel 11 Hot water surface 14 Ring-shaped member of rectangular section 15 Ring-shaped member of wedge-shaped section 16 Slag 17 Seal ring 18 Jig for hanging 19 Plasticizer for sealing 20 Passage

Claims (4)

A sealing method that covers the joint between the ladle and the pan lid, fitting the ring-shaped member attached along the outer periphery of the pan lid to the ring-like member attached along the outer periphery on the upper end side of the ladle. In addition, either the ring-shaped member mounted along the outer periphery of the pan lid or the ring-shaped member mounted along the outer periphery on the upper end side of the ladle makes a wedge that forms an acute angle in the fitting direction. In the case of a ring-shaped member mounted along the outer periphery of the pan lid, the other is vertically extended toward the lower side and mounted along the outer periphery on the upper end side of the ladle. In the case of a ring-shaped member, the ring-shaped member extends vertically and is fitted to the outside of the ring-shaped member having the wedge-shaped cross section so as to cover the outer periphery of the joint portion between the ladle and the pan lid. A sealing method that covers the joint between the ladle and the lid. Between the ladle and the pan lid, a seal ring on which the pan lid is placed in close contact is disposed, and the seal ring has a ring-shaped member on the outer periphery thereof, and the upper end of the ring-shaped member and the ladle A sealing method for covering a joint portion between a ladle and a pan lid to fit a ring-shaped member mounted along the outer periphery of the side, wherein the ring-shaped member mounted along the outer periphery of the seal ring or the Either one of the ring-shaped members mounted along the outer periphery on the upper end side of the pan has a wedge-shaped cross section forming an acute angle in the fitting direction, and the other is mounted along the outer periphery of the seal ring. In the case of a ring-shaped member, it extends in the vertical direction downward, and in the case of a ring-shaped member attached along the outer periphery on the upper end side of the ladle, it extends in the vertical direction upward, and the ladle So that it covers the outer periphery of the joint of the seal ring. Sealing method for covering the joint portion of the ladle and Nabefuta, characterized in that fitted to the outside of the beauty-shaped cross section of the ring-shaped member. A sealing device that covers a joining portion of a ladle and a pan lid, wherein the sealing device is attached along an outer periphery of a ring-shaped member attached along an outer periphery of the pan lid or an upper end side of the ladle One of the ring-shaped members has a wedge-shaped cross section forming an acute angle in the fitting direction, and the other is a vertical direction toward the lower side in the case of the ring-shaped member mounted along the outer periphery of the pan lid In the case of a ring-shaped member attached along the outer periphery on the upper end side of the ladle, it is stretched in the vertical direction upward so as to cover the outer periphery of the joint between the ladle and the pan lid A sealing device for covering a joint portion of a ladle and a pan lid, which is fitted to the outside of the ring-shaped member having the wedge-shaped cross section. Between the ladle and the pan lid, a seal ring on which the pan lid is placed in close contact is placed, and the seal ring has a ring inner diameter equal to the ladle inner diameter and has a ring-shaped member on the outer periphery thereof The ladle has a ring-shaped member mounted along the outer periphery on the upper end side thereof, and a ladle-pan lid joint for fitting the ring-shaped member of the seal ring and the ring-shaped member of the ladle A wedge-shaped cross section in which either one of the ring-shaped member of the seal ring or the ring-shaped member mounted along the outer periphery of the upper end side of the ladle forms an acute angle. In the case of a ring-shaped member mounted along the outer periphery of the seal ring, the other is a ring-shaped member that extends vertically downward and is mounted along the outer periphery on the upper end side of the ladle. In the case of a member, it extends in the vertical direction upward, Serial ladle and sealing device covering the junction of the ladle and Nabefuta, characterized in that fitted on the outside of the wedge-shaped cross section of the ring-shaped member so as to cover the outer periphery of the joint portion of the sealing ring.

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