JP2012036417A - Device for removing scull - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for removing a scull, which has a simple device configuration and is quick-attachable/releasable to/from a converter steelmaking lance, is possible to remove a scull in a short time, and achieves a long service life.SOLUTION: The device 10 for removing a scull is mounted to a tip end of the converter steelmaking lance 13 to remove a scull adhered to a converter throat. The device for removing a scull includes: a mounting rod 14 which is inserted into an oxygen exhaust nozzle 11, and whose end on the insertion side is projected from a base end of the oxygen exhaust nozzle 11; a latch 15 that is reclinably provided at the end on the insertion side, and whose greatest width L including the mounting rod 14 in a reclinded state thereof is set to 1.1-2.1 times of the base end internal width D of the oxygen exhaust nozzle 11 into which the latch is inserted; a fixing member 16 placed inside the mounting rod 14 and having an end 21 abutting on the latch 15 to maintain the reclined state of the latch and a base part projected outside the oxygen exhaust nozzle 11; and an oxygen injecting device 17 provided in the base part and injecting the oxygen injected from an oxygen exhaust nozzle 12, in a direction perpendicular to the axial center of the converter steelmaking lance 13.

Description

The present invention relates to a metal removal device for removing metal attached to a converter furnace port.

In the refining of molten steel in a converter, metal is attached to the converter furnace mouth due to rebound of the molten steel caused by blowing high-pressure oxygen from a converter lance (hereinafter also simply referred to as a lance). If the bare metal adheres in this way, when tilting the converter, the bare metal protruding outside the converter furnace contact the cover placed above the converter, and this cover breaks and water leakage troubles occur. In addition, there is a risk that when the scrap is charged into the converter, the converter furnace port is narrow, so that it becomes difficult to charge the scrap and falls out of the converter furnace.
Therefore, conventionally, before the bullion grows greatly, the converter is tilted and the furnace port is directed to the side, and the operator blows and blows oxygen gas onto the bullion that is attached with an oxygen pipe. It was. However, in such a method, since a long time is required for fusing the metal, workability is poor, and the operating rate of the converter is lowered and productivity is deteriorated.

For this reason, for example, as shown in Patent Documents 1 to 4, a bullion attached to the tip portion of the lance is removed to remove the adhered bullion.
In patent document 1, the hollow ring divided | segmented into the circumferential direction of the lance, the insertion pipe | tube provided in the upper surface of the hollow ring, respectively inserted in the several lance hole, and the outer peripheral cylindrical surface of the hollow ring were attached. An apparatus for interconnecting oxygen gas ejection units composed of a plurality of ejection pipes by coupling means is disclosed.
Further, in Patent Document 2, a ring-shaped slit is formed between the lance nozzle tip and a mounting portion provided inside and at the center of the lance so as to form an annular slit between the nozzle end surface and the oxygen flow of the nozzle. An oxygen flow converting member that converts in the outward direction, and a slit closing member that rotates along with the rotation of the oxygen flow converting member and closes a part of the ring-shaped slit between the oxygen flow converting member and the mounting portion. An apparatus composed of:

In Patent Documents 3 and 4, a guide member provided with a through hole for guiding an oxygen jet ejected from a lance hole attached to the distal end of the lance, and a distal end side penetrating the through hole is a fulcrum on the proximal end side. A fixed arm that is paired so as to be freely movable toward and away from, and a biasing mechanism in which the tip of the fixed arm is inserted into the lance hole and normally biased in the approaching direction. An apparatus is disclosed in which an opening is provided on a side surface through which an oxygen jet flowing from a lance hole through a through hole is ejected in a horizontal direction.

JP 2001-192722 A (FIG. 1) Japanese Patent Laying-Open No. 2004-143569 (FIG. 1) Japanese Patent Laid-Open No. 10-324908 (FIG. 3) JP-A-10-102124 (FIG. 4)

However, the bullion removing apparatuses described in Patent Documents 1 to 4 still have the following problems to be solved.
Since all of the devices described in Patent Documents 1, 3, and 4 have a complicated device configuration, they may be difficult to attach and detach due to exposure to high temperatures when the metal is removed and seizing or the like. . In addition, since the device is attached to the lance using a lance hole through which oxygen is blown when the metal is removed, the insertion portion of the device into the lance hole is likely to be damaged, the device may fall off the lance, and the life of the device May be shortened. In particular, in Patent Document 1, since the device is attached to the lance using the inclination of a plurality of lance holes, when the insertion tube is damaged, the insertion tube slides down from the lance hole and the device falls off the lance. There is a fear. In Patent Documents 3 and 4, the hook portion provided at the tip of the pair of fixed arms is easily damaged, and the width of the hook portion is smaller than the inner width of the lance hole. There is a risk that the device may come off and fall off the lance.
Moreover, since it is necessary to modify a lance in order to attach an apparatus, the apparatus of patent document 2 requires manufacturing cost. In addition, since the slit closing member is used, oxygen is blown partially, so that it takes time to melt the metal. Furthermore, since the oxygen flow conversion member is attached to the lance with bolts, it may be difficult to attach and detach the device because it is exposed to high temperature when the metal is removed and seizure occurs.

The present invention has been made in view of such circumstances, and the apparatus configuration is simple, can be easily attached to and detached from the converter steelmaking lance, can remove the bare metal in a short time, and can extend the life. The purpose is to provide.

A bullion removing apparatus according to the present invention that meets the above-described object is attached to the tip of a converter steelmaking lance having a plurality of oxygen outlets and removes the bullion attached to the converter furnace port. In
A cylindrical mounting rod that is inserted from the outside into the oxygen ejection port, and the insertion-side front portion projects from the proximal end portion of the oxygen ejection port to the inside of the converter steelmaking lance,
It is provided at the insertion side tip of the mounting rod so that it can be tilted, and when tilted, the maximum width L including the mounting rod is 1.1 of the proximal end inner width D of the oxygen outlet into which the mounting rod is inserted. A latching portion that is not less than 2 times and not more than 2.1 times,
A fixing member mounted in the mounting rod, a tip portion contacting the latching portion to maintain the tilting state of the latching portion, and a base portion projecting to the outside of the oxygen ejection port;
Oxygen blowing means provided at a base portion of the fixing member and blowing out oxygen blown out from the oxygen jet nozzle into which the mounting rod is not inserted in a direction perpendicular to the axis of the converter steelmaking lance; Have

In the bare metal removing apparatus according to the present invention, the oxygen spraying means is attached to the fixing member by a screw member, and a heat insulating material to be attached around the screw member is attached around the screw member. It is preferable that a locking metal fitting for maintaining the state is provided.

In the bullion removing apparatus according to the present invention, it is preferable that the oxygen jet port into which the mounting rod is inserted is located at the axial center of the converter steelmaking lance.

In the bullion removal apparatus according to the present invention, the oxygen spraying means includes a disk-shaped oxygen flow changing portion attached perpendicular to the axis of the converter steelmaking lance, and the oxygen flow changing portion. A ring member arranged with a gap Δh (mm), and assuming that the flow rate of oxygen blown from the gap Δh is Q (m ³ / hour), the flow rate Q of oxygen and the gap Δh The ratio Q / Δh is preferably 500 or more and 3000 or less.

The bullion removing device according to the present invention is provided so as to be tiltable at an insertion-side front portion of a mounting rod inserted into an oxygen jet port, and has a maximum width L including the mounting rod at the time of tilting within the proximal end portion of the oxygen jet port. Since it has a latching portion that is 1.1 to 2.1 times the width D, it can be latched at the base end of the oxygen jet by tilting the latch after inserting the mounting rod into the oxygen jet. The part is caught, and the dropping of the mounting rod from the oxygen spout can be suppressed and further prevented.
In addition, the fixing member is mounted in the mounting rod in order to maintain the tilting state of the latching portion, and is not exposed to a high temperature environment during the removal of the metal, so that the seizure between the mounting rod and the fixing member is suppressed. Can be prevented.
Furthermore, since the oxygen blown out from the oxygen blowing means is oxygen blown out from an oxygen jet port other than the oxygen jet port into which the mounting rod is inserted, damage to the mounting rod can be suppressed.
From the above, the apparatus configuration is simple, and it can be easily attached to and detached from the converter steelmaking lance, so that the metal can be removed in a short time and the life can be extended.

In addition, when the oxygen spraying means is attached to the fixing member by the screw member, and when the locking metal fitting is provided around the screw member, the adhesion state of the heat insulating material attached around the screw member can be maintained. It is possible to suppress and further prevent the insulation material from falling off. Thereby, even if the screw member is exposed to a high temperature during the removal of the metal, the seizure between the fixing member and the screw member can be suppressed, so that the oxygen spraying means can be easily attached and detached in a short time.

Then, when the oxygen jet port into which the mounting rod is inserted is located at the axis of the converter steelmaking lance, the axis of the lance and the axis of the oxygen spraying means can be aligned. Thus, for example, when a plurality of oxygen jets are provided around the oxygen jets into which the mounting rods are inserted, oxygen is blown out from other oxygen jets in which the mounting rods are not inserted at the time of metal removal. Even so, the pressure of the blown-out oxygen is applied substantially evenly around the axis of the oxygen blowing means. Therefore, it is possible to extend the life of the apparatus by suppressing partial damage of the oxygen spraying means.

Further, the oxygen spraying means has a disk-shaped oxygen flow changing portion and a ring member disposed with a gap Δh between the oxygen flow changing portion, and the flow rate Q of oxygen blown from the gap Δh and the gap When the ratio Q / Δh to Δh is 500 or more and 3000 or less, the flow rate of oxygen blown from the gap can be increased within a range in which damage to the apparatus can be suppressed. Accordingly, the metal removal can be performed in a short time, and the life of the metal removal apparatus can be extended.
Here, since the oxygen flow changing part is mounted perpendicular to the axis of the converter steelmaking lance, the mounting rod is inserted into the oxygen jet outlet located at the axis of the converter steelmaking lance. Therefore, it is possible to simplify an apparatus configuration for blowing oxygen blown out from other oxygen jet outlets in a direction perpendicular to the axis of the converter steelmaking lance.

It is explanatory drawing of the use condition of the bullion removal apparatus which concerns on one embodiment of this invention. (A)-(C) are the front view of the attachment rod of the same bullion removal apparatus, the front view of a fixing member, and the front view of a screw member, respectively. (A), (B) is the top view and side sectional drawing of the oxygen spraying means of the bullion removal apparatus, respectively. (A)-(D) are explanatory drawings of the attachment method of the bullion removal apparatus. (A)-(C) are explanatory drawings of the attachment method of the bullion removal apparatus. It is a graph which shows the influence which ratio L / D has on the lifetime of a bullion removal apparatus. It is a graph which shows the influence which ratio Q / (DELTA) h has on the metal melt | fusion time by a metal removal apparatus, and the lifetime of a metal removal apparatus.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1 to FIG. 5, a bare metal removing device 10 according to an embodiment of the present invention is for converter steelmaking provided with a plurality of oxygen outlets 11 and 12 (only two are shown here). A device attached to the tip of a lance (hereinafter also simply referred to as a lance) 13 for removing the bare metal adhering to a converter furnace port (not shown). The device configuration is simple and can be easily attached to and detached from the lance 13. It is a device that can perform bullion removal in a short time and can extend the service life. This will be described in detail below.

As shown in FIGS. 1, 4, and 5, the lance 13 for attaching the metal removal device 10 is for spraying high-pressure oxygen to the molten steel charged in the converter, and oxygen is applied to the tip thereof. A plurality of oxygen outlets 11 and 12 for blowing downward (toward the converter bottom surface) are provided. In addition, each oxygen jet nozzle 11 and 12 becomes a structure which can implement blowing and a stop of oxygen separately (independently), respectively.
This oxygen spout 11 is formed at the axial center position of the lance 13 (the axial center of the oxygen spout 11 is aligned with the axial center of the lance 13). A plurality of (for example, 2 to 8, four in this example) are formed at equal pitches in the circumferential direction around the axis of the lance 13. The plurality of oxygen jets 12 have their axes centered on the axis of the lance 13 so that the interval between the adjacent oxygen jets 12 increases from the base side (inner side) to the front side (outer side) of the lance 13. It is formed in the lance 13 in a state of being inclined with respect to the lance 13.

The oxygen outlets 11 and 12 have a circular cross section, and the inner width (inner diameter) is gradually widened from the base side of the lance 13 toward the front side (oxygen blowing direction), but may be the same. For example, the base end portion inner width (minimum inner diameter) D of the oxygen spout 11 formed at the axial center position of the lance 13 is about 10 to 100 mm, and the base end portion inner width (minimum inner diameter) of the other oxygen spouts 12 is. Is about 30 to 100 mm.
In the present embodiment, the bare metal removing device 10 is attached to the lance 13 using the oxygen outlet 11 formed at the axial center position of the lance 13. As shown in FIGS. 1 to 3, the bare metal removing device 10 includes a mounting rod 14 that is inserted into the oxygen ejection port 11 from the outside, and a latching portion 15 that is provided at an insertion side front portion of the mounting rod 14. The fixing member 16 is mounted in the mounting rod 14, and the oxygen spraying means 17 is provided at the base of the fixing member 16.

As shown in FIGS. 1 and 2A, the mounting rod 14 is a cylindrical member made of stainless steel, and an internal thread is formed on the inner periphery thereof.
The outer diameter of the mounting rod 14 is smaller than the minimum inner diameter of the oxygen ejection port 11, and when the attachment rod 14 is inserted into the oxygen ejection port 11 from the outside, the insertion side distal portion extends from the proximal end portion of the oxygen ejection port 11. The base end portion (opposite side of the insertion side front portion) protrudes to the outside of the oxygen outlet 11 (longer than the bottom thickness of the lance 13). The length of the mounting rod 14 is such that the base end portion of the mounting rod 14 protrudes outside the oxygen outlet 11 when the mounting rod 14 is attached to the oxygen outlet 11. It may be a length that does not protrude to the outside.

A support base 18 that supports the latching portion 15 so as to be tiltable (rotatable) is provided at the insertion side tip of the mounting rod 14. Note that the support base 18 is configured to sandwich the rotation base portion of the latching portion 15 from both sides.
The latching portion 15 maintains an upright state when the mounting rod 14 is inserted into the oxygen ejection port 11 (the tip may contact the inner surface of the oxygen ejection port 11). The tip lower surface 19 (the tip side surface at the time of standing) abuts against the inner surface 20 of the lance 13 positioned at the proximal end of the oxygen outlet 11 at the time of tilting. The length from the proximal end to the distal end of the latching portion 15 is such that the maximum width L including the attachment rod 14 when the latching portion 15 is tilted is the proximal end of the oxygen outlet 11 into which the attachment rod 14 is inserted. The length is adjusted to 1.1 to 2.1 times the internal width D. The maximum width L including the mounting rod 14 is a width including not only the width of the latching portion 15 but also the portion of the mounting rod 14 protruding from the latching portion 15 when tilted in plan view ( (See FIG. 1). When the mounting rod 14 is within the width of the latching portion 15 when tilted in plan view (when the diameter of the mounting rod 14 is small), the width of the latching portion 15 becomes the maximum width D.

Here, as a result of examining the influence of the ratio L / D between the maximum width L of the latching portion including the mounting rod and the inner end width D of the oxygen outlet on the lifetime of the metal removal device, FIG. Will be described with reference to FIG. FIG. 6 shows the results of various changes in the ratio L / D between the maximum width L and the base end inner width D.
As shown in FIG. 6, when the ratio L / D is less than 1.1, the maximum width L with respect to the base end inner width D is too short. Can easily fall off the lance. On the other hand, when the ratio L / D exceeds 2.1, since the maximum width L with respect to the proximal end inner width D is too long, it is difficult to tilt or stand the latching portion, although the device can be prevented from falling off the lance. This makes it difficult to mount and remove the mounting rod.
Therefore, the maximum width L of the latching portion including the mounting rod is 1.1 times to 2.1 times (optimum range) of the inner end width D of the oxygen outlet, but the lower limit is 1.2 times. Further, it is preferable that the ratio is 1.5 times and the upper limit is 2.0 times.

As shown in FIGS. 1 and 2B, the fixing member 16 is a rod-shaped member made of stainless steel, and a male screw that is screwed into a female screw formed on the mounting rod 14 is formed on the outer periphery thereof. ing.
The fixing member 16 is mounted in the mounting rod 14, and the tip of the tip portion 21 (the mounting side in the mounting rod 14) comes into contact with the base of the latching portion 15 and the latching portion 15 is tilted. In addition, the base has a length that protrudes to the outside of the oxygen ejection port 11 (longer than the mounting rod 14).
Moreover, since the bolt 22 is attached to the base of the fixing member 16, the fixing member 16 can be easily attached to and detached from the mounting rod 14 by using a jig such as a spanner.

The oxygen spraying means 17 is made of stainless steel, and is attached perpendicularly to the axis of the lance 13 (as shown in FIGS. 1, 3A and 3B). The disc-shaped oxygen flow changing unit 23 (which matches the axial center of the flow changing unit 23) and the oxygen flow changing unit 23 and the axis are aligned with a gap Δh (mm). And a ring member 24.
The oxygen flow changing portion 23 has an outer diameter of about 3 to 15% of the inner diameter of the converter furnace port, and collides oxygen blown out from the oxygen outlet 12 other than the oxygen outlet 11 into which the mounting rod 14 is inserted. The flow is changed in a direction (horizontal direction) perpendicular to the axis of the lance 13.
A through hole 25 for insertion into the fixing member 16 is formed at the axial center position of the oxygen flow changing portion 23, and a thick wall with which the tip of the lance 13 can contact the peripheral edge of the through hole 25 on the lance 13 side. A portion 26 is provided. Thus, by providing the thick portion 26, the oxygen jet port 12 other than the oxygen jet port 11 (the mounting rod 14 is not inserted) and the upper surface (except for the thick portion 26) of the oxygen flow changing portion 23, , And the oxygen can be smoothly blown out from each oxygen outlet 12.

On the lance 13 side of the oxygen flow changing portion 23, a ring member 24 having an outer diameter substantially the same as the outer diameter of the oxygen flow changing portion 23 is disposed. Note that the size (for example, about 10 to 30 mm) of the gap Δh between the oxygen flow changing portion 23 and the ring member 24 is adjusted by a cylindrical gap adjusting member 27, and the oxygen flow changing portion 23, the ring member 24, and The gap adjusting member 27 is integrated with the bolt 28. A plurality (for example, about 3 to 10) of gap adjusting members 27 are provided at an equal pitch in the circumferential direction of the oxygen flow changing portion 23.
The ring member 24 is arranged so that the front side surface of the lance 13 is in contact with or close to the upper surface of the ring member 24 and surrounds the oxygen ejection ports 11 and 12 from the outside, and oxygen blown out from each oxygen ejection port 12 is Leakage from between the lance 13 and the ring member 24 is suppressed.
When the flow rate of oxygen blown from the gap Δh is Q (m ³ / hour), the ratio Q / Δh between the flow rate Q of oxygen and the gap Δh is preferably 500 or more and 3000 or less. The flow rate Q of oxygen is about 15000 to 30000 (m ³ / hour).

Here, with reference to FIG. 7, the results of examining the influence of the ratio Q / Δh between the flow rate Q of oxygen and the gap Δh on the melting time of the bullion and the life of the bullion removing device will be described with reference to FIG. explain. FIG. 7 shows the results of various changes in the ratio Q / Δh between the oxygen flow rate Q and the gap Δh.
As shown in FIG. 7, when the ratio Q / Δh is less than 500, the flow rate of oxygen Q with respect to the gap Δh is too small. The life of the device tends to be shortened. On the other hand, when the ratio Q / Δh exceeds 3000, the oxygen spraying means may be deformed, and it may be difficult to obtain an oxygen flow rate suitable for fusing. This is presumably due to the fact that the oxygen flow rate Q is too large while the gap Δh is narrow, so that the amount of heat generated at the time of fusing increases and the oxygen spraying means that has received heat is deformed. For this reason, the time required for the molten metal melt slightly increases and the life of the apparatus tends to be shortened.
Accordingly, the ratio Q / Δh between the oxygen flow rate Q and the gap Δh is set to 500 or more and 3000 or less (optimum range), but it is preferable that the lower limit is 700 and the upper limit is 2000.

The oxygen blowing means 17 is attached to the fixing member 16 by attaching a mounting nut 29 and a cap nut (an example of a screw member) 30 to the fixing member 16 as shown in FIGS. 1 and 2C. Yes.
A positioning portion 31 that fits into the through hole 25 of the oxygen flow changing portion 23 is provided on the upper surface of the mounting nut 29. Accordingly, the oxygen spraying means 17 can be attached and fixed to the fixing member 16 while preventing the lateral displacement of the oxygen spraying means 17 with respect to the fixing member 16.
In addition, a cap nut 30 is disposed below the mounting nut 29 via a washer 32. The cap nut 30 is attached to the fixing member 16 so as to surround the base portion (including the bolt 22) of the fixing member 16, and reliably prevents the oxygen blowing means 17 from falling off the fixing member 16. It is.

Around the cap nut 30, for example, a plurality of locking fittings (also referred to as studs) 33 bent in a V shape or the like are provided. Thereby, after attaching the cap nut 30 to the fixing member 16, as shown in FIG. 5C, a mortar (an example of a heat insulating material) 34 that is an amorphous refractory is attached around the cap nut 30. The adhesion state can be maintained. Therefore, since the fall of the mortar can be prevented at the time of removing the metal, the seizure of the mounting nut 29 and the cap nut 30 with respect to the fixing member 16 can be suppressed and further prevented.
The attachment of the oxygen spraying means to the fixing member is not limited to the above-described device configuration as long as the oxygen spraying means can be attached to the fixing member.

Then, the usage method of the bullion removal apparatus 10 which concerns on one embodiment of this invention is demonstrated, referring FIG. 4, FIG.
As shown in FIG. 4 (A), during operation of the converter, oxygen is blown into the converter from the oxygen outlets 11 and 12 of the converter steelmaking lance 13. By performing such a converter operation, when the metal is attached to the converter furnace port and needs to be removed, the metal removal operation is performed using the metal removal device 10.
The bullion removing device 10 is attached to the tip of a spare converter steel lance 13. Hereinafter, the attachment method will be described.

As shown in FIG. 4B, the mounting rod 14 is inserted from the outside into the oxygen outlet 11 located at the axial center of the lance 13 in a state where the blowing of oxygen is stopped. At this time, the fixing member 16 is mounted in the mounting rod 14 within a range in which the latching portion 15 maintains the standing state. However, after the mounting rod 14 is inserted into the oxygen ejection port 11, The fixing member 16 may be attached to the.
Then, as shown in FIG. 4C, the bolt 22 at the base of the fixing member 16 is removed until the tip of the tip 21 of the fixing member 16 contacts the base of the latching portion 15 that is tilted or in the tilting process. Rotate using a wrench or other jig. Thereby, since the latching | locking part 15 maintains an inclined state, the attachment rod 14 can be attached and fixed in the oxygen jet nozzle 11. FIG.

Next, as shown in FIG. 4D, the oxygen blowing means 17 is inserted into the fixing member 16, and the mounting nut 29 is attached to the base of the fixing member 16 as shown in FIG.
Then, as shown in FIG. 5 (B), after the washer 32 and the cap nut 30 are attached to the base of the fixing member 16, they are positioned below the oxygen spraying means 17 as shown in FIG. 5 (C). A mortar 34 is attached so as to cover the mounting nut 29, the washer 32, and the cap nut 30.
After the lance 13 to which the bullion removing device 10 is attached by the above-described method is inserted into the converter furnace port, the attachment rod 14 is in a state where the blowing of oxygen from the oxygen outlet 11 into which the attachment rod 14 is inserted is stopped. Oxygen is blown out from the oxygen spout 12 which is not inserted.

Thereby, the oxygen blown out from each oxygen outlet 12 passes through the gap Δh of the oxygen blowing means 17 in a direction perpendicular to the axis of the lance 13, that is, radially outward of the oxygen blowing means 17. It can blow out radially over the circumferential direction, and as a result, the metal which has adhered to the converter furnace mouth (inner winding part etc.) can be fused. The oxygen flow rate Q at this time is preferably set with reference to the gap Δh and the ratio Q / Δh.
After the melting of the bullion is finished, the blowing of oxygen from each oxygen outlet 12 is stopped, the lance 13 is taken out from the converter furnace port, and the bullion removing device 10 is further cooled. Then, after removing the mortar 34, the cap nut 30, the washer 32, and the mounting nut 29 are sequentially removed from the fixing member 16, and the oxygen spraying means 17 is removed. Here, since the cap nut 30 and the attachment nut 29 were covered with the mortar 34, the seizure to the fixing member 16 can be suppressed, and the removal work can be facilitated.

Next, the bolt 22 at the base portion of the fixing member 16 is turned using a jig such as a spanner until the hooking portion 15 in the tilted state can stand up. Thereby, the attachment rod 14 can be removed from the oxygen ejection port 11 by pulling the attachment rod 14 downward.
Since the bullion removing device 10 is attached to the spare lance 13, a normal converter operation can be performed by taking out the lance 13 to which the bullion removing device 10 is attached from the converter. Moreover, even if it is necessary to replace the lance for carrying out the converter operation and it is necessary to use the spare lance 13 to which the bullion removing device 10 is attached, the removal of the bullion removing device 10 is performed in a short time. Therefore, the downtime of converter operation can be shortened.
From the above, by using the bullion removing device 10 of the present invention, the bullion removal can be performed in a short time, the reduction in the operating rate of the converter can be suppressed, the productivity can be improved, and the life can be extended. I can plan.

Next, examples carried out for confirming the effects of the present invention will be described.
First, using a bullion removal device in which the ratio L / D between the maximum width L of the latching portion including the mounting rod and the base end portion inner width D of the oxygen outlet was changed, the life and loading / unloading load were examined. The results will be explained. In this examination, the ratio Q / Δh between the oxygen flow rate Q (m ³ / hour) and the gap Δh (mm) was made constant at 3000. In addition, here, the presence or absence of use of a heat insulating material (use of a cap nut provided with a locking metal fitting) was also examined. Table 1 shows the examination conditions and results.

“×” in the column of the life shown in Table 1 indicates that the life of the device is less than 5 times and is not practical, “Δ” indicates that the life of the device is 5 to 30 times and is practical, and “○” indicates that the device is It means that the lifetime is more than 30 times and is practical. In addition, “×” in the column of attachment / detachment load requires time for attachment / detachment and cannot be used practically (the maximum width L is too long and the latching portion does not move easily), and “△” requires hammering when removing the device. However, it can be put into practical use without requiring a long time for attachment and detachment, and “◯” means that it can be attached and removed in a short time and is practical.

As shown in Table 1, in Examples 1 to 6 in which the ratio L / D was 1.1 times or more and 2.1 times or less, since the ratio L / D was in the optimum range, the ratio L / D was 1.1. Compared with Comparative Example 1 which is less than double, the life of the device can be extended, and the latching portion is easy to move and the device is relatively easy to attach and detach. In Comparative Example 2 in which the ratio L / D exceeds 2.1 times, since the ratio L / D is large, the life of the device can be extended, but the maximum width L is too long and the latching portion is difficult to move. It took time to put on and take off.
In particular, in Examples 2, 4, and 6 in which the ratio L / D satisfies the above-described optimum range and the mounting nuts and cap nuts are covered with a heat insulating material, seizure to the fixing member can be suppressed, and the apparatus can be attached and detached. Could be carried out in a short time.

Next, a description will be given of the result of examining the metal removal time using a metal removal device in which the ratio Q / Δh of the oxygen flow rate Q (m ³ / hour) and the gap Δh (mm) is variously changed. Table 2 shows the examination conditions and results.

“◯” in the column of bullion removal time shown in Table 2 means that the bullion removal time is less than 15 minutes, and “Δ” means that the bullion removal time is 15 to 40 minutes.

As shown in Table 2, in Examples 3, 8, and 9 in which the ratio Q / Δh is 500 or more and 3000 or less, the ratio Q / Δh is in the optimum range. And the bullion removal time was shortened.
In Example 7, the oxygen spraying means was deformed, and it was difficult to obtain an oxygen flow rate suitable for fusing. This is presumably because the oxygen flow rate Q was too large while the gap Δh was narrow, so the amount of heat generated at the time of fusing increased, and the oxygen spraying means receiving heat was deformed.
In Example 10, since the gap Δh was wide, the flow rate Q of oxygen could not be increased, and it was difficult to shorten the metal removal time. If time is taken, the bullion can be removed.
In Examples 7 and 10 described above, the bullion removal time is longer than those in Examples 3, 8, and 9, but can be significantly shortened compared to the conventional examples.
From the above, it can be confirmed that by using the bullion removing device of the present invention, it is easy to attach and detach to the converter steelmaking lance, and the bullion removal can be performed in a short time and the life can be extended. It was.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, a case where the bullion removing device of the present invention is configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
In the above-described embodiment, the case where the bullion removing device is attached to the oxygen outlet formed at the axial center of the lance has been described. However, the bullion removing device may be attached to another oxygen outlet. it can. In this case, the inner width of the base end of the oxygen jet outlet to be attached is D, and the latching portion is provided on the attachment rod so that the maximum width L including the attachment rod when tilting satisfies the range of the above-described embodiment. . Here, the number of mounting rods to be used may be one, or two or three as long as an oxygen ejection port into which the mounting rod is not inserted can be secured (corresponding to the number of oxygen ejection ports into which the mounting rod is inserted). . At this time, it is preferable to bend the attachment part of the oxygen spraying means provided on the fixing member so that the oxygen flow changing part of the oxygen spraying means is orthogonal to the axis of the lance.

10: Metal removal device, 11, 12: Oxygen jet, 13: Converter steelmaking lance, 14: Mounting rod, 15: Hook, 16: Fixing member, 17: Oxygen spraying means, 18: Support base , 19: tip lower surface, 20: inner surface, 21: tip, 22: bolt, 23: oxygen flow changing portion, 24: ring member, 25: through hole, 26: thick portion, 27: gap adjusting member, 28 : Bolt, 29: mounting nut, 30: cap nut (screw member), 31: positioning part, 32: washer, 33: locking bracket, 34: mortar (heat insulating material)

Claims (4)

In the bullion removal device that is attached to the tip of a converter steelmaking lance with a plurality of oxygen jets and removes the bullion attached to the converter furnace port,
A cylindrical mounting rod that is inserted from the outside into the oxygen ejection port, and the insertion-side front portion projects from the proximal end portion of the oxygen ejection port to the inside of the converter steelmaking lance,
It is provided at the insertion side tip of the mounting rod so that it can be tilted, and when tilted, the maximum width L including the mounting rod is 1.1 of the proximal end inner width D of the oxygen outlet into which the mounting rod is inserted. A latching portion that is not less than 2 times and not more than 2.1 times,
A fixing member mounted in the mounting rod, a tip portion contacting the latching portion to maintain the tilting state of the latching portion, and a base portion projecting to the outside of the oxygen ejection port;
Oxygen blowing means provided at a base portion of the fixing member and blowing out oxygen blown out from the oxygen jet nozzle into which the mounting rod is not inserted in a direction perpendicular to the axis of the converter steelmaking lance; A bullion removing device characterized by comprising: 2. The bare metal removing apparatus according to claim 1, wherein the oxygen spraying means is attached to the fixing member by a screw member, and a heat insulating material attached around the screw member is provided around the screw member. A bullion removing device provided with a locking metal fitting for maintaining the adhesion state. 3. The bullion removing device according to claim 1, wherein the oxygen jet port into which the mounting rod is inserted is located at an axis of the converter steelmaking lance. 4. The bullion removing apparatus according to claim 1, wherein the oxygen spraying means is a disk-shaped oxygen flow changing portion that is attached orthogonal to the axis of the converter steelmaking lance. 5. And a ring member provided with a gap Δh (mm) between the oxygen flow changing portion and the oxygen flow changing portion on the converter steelmaking lance side of the oxygen flow changing portion. And the ratio Q / Δh between the flow rate Q of oxygen and the gap Δh is 500 or more and 3000 or less, where Q (m ³ / hour) is the flow rate of oxygen blown out from the gap Δh. To remove bullion.

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