KR20030073971A - A flug for a converter tapping hole sleeve - Google Patents

Abstract

PURPOSE: A plug for converter tapping hole sleeve is provided to effectively prevent initial slag from mixing with ladle during converter tapping by inserting plug into the inner side of sleeve installed in tapping hole of converter, thereby elastically fixing the plug into the sleeve. CONSTITUTION: In a plug(1) for converter tapping hole sleeve for suppressing outflow of slag floated on molten steel during initial converter tapping in a converter that is the steelmaking process for refining hot metal into molten steel, the plug(1) for converter tapping hole sleeve comprises a body(30) an inner part of which is hollow; a cap member(40) covered to the front side of the body(30) in such a way that the cap member(40) corresponds to inner diameter of the sleeve; an elastic supporting body(50) connected to the body(30) to prevent the plug from being squeezed from the inner side of the sleeve to the exit side of the sleeve; and a cover member(60) inserted into and fixed to the rear side of the body(30) to seal the body(30) so that mixing of slag with ladle during converter tapping is effectively blocked.

Description

Plug for converter outlet sleeve {A FLUG FOR A CONVERTER TAPPING HOLE SLEEVE}

The present invention relates to a plug (PLUG) inserted into the converter outlet sleeve to prevent the mixing of the ladle of the initial slag (SLAG) of the converter in the converter refining process for refining the molten iron to molten steel, in particular, the converter The plug is inserted into the inside of the sleeve (SLEEVE) installed in the entrance of the elastically fixed, it relates to a converter outlet sleeve plug that can effectively prevent the ladle mixing of the initial slag during the conversion of the converter.

In the converter process, which is generally a steelmaking process, the slag (SLAG) injured in the upper part of the molten steel refined in the converter is ladle together with the molten steel during the initial tapping operation, in which the refined molten steel flows out into the ladle through the converter outlet. The plug (PLUG) is inserted to the outside of the converter outlet for the purpose of blocking the mixing.

That is, as shown in Figure 1, the converter 100 is rotated 360 degrees around the center of the trunnion ring 110 to support it, charging the scrap iron and molten iron, the oxygen lance 120 Oxygen is blown into the converter to make molten iron into molten steel.

By the way, the converter 100 is made of a thick outer shell (100a), the interior of the shell 100a is a refractory (100b) to withstand the high temperature melt (m) is built, the molten steel (m) It has a tap hole 130 that flows out.

Meanwhile, as illustrated in FIG. 1A, in the converter converter outlet 130, dust or flame (f) is ejected when oxygen is blown through the converter outlet 130 in an upright state, as illustrated in FIG. 1B. When tilting the converter exit 130 while tilting (100), the injured slag (S) on the molten steel (m) is mixed into the ladle (L) during initial tapping through the converter exit (130) and then the converter When complete tilting is achieved, the molten steel (m) through the converter outlet 130 is to the ladle (L).

At this time, as shown in Figure 2, the tapping hole 130 of the converter 100 is covered with a refractory 100b to the inside of the converter bark (100a), the tapping hole 130 formed between the refractory (100b). ) Inside the molten steel (m) is inserted into the sleeve 140 for reducing the wear of the refractory (100b) is inserted into the molten steel through the sleeve 140, the inside of the sleeve 140 is hollow (140a) ) Is a cylindrical body.

Therefore, as illustrated in FIG. 1A, in the blowing operation in which oxygen is blown into the melt m in the converter 100 through the oxygen lance 120, through the converter outlet 130 shown in FIGS. 1 and 2. In order to prevent the flame and dust (f) from being discharged out, and to prevent the slag (S) injured in the initial molten steel of the converter tapping into the ladle (L) as shown in Figure 1b. As in 3, it is to use the plug 150 to temporarily block the sleeve 140 inserted into the converter outlet 130.

That is, as shown in FIG. 3, the operator inserts the pointed portion of the insertion table 160 into the rear groove of the plug 150 to fit the sleeve 140 of the converter outlet 130.

On the other hand, the conventional plugs used in the initial initial tap as shown in Figure 4 and 5 are shown.

That is, in FIGS. 4A and 4B, the conical plug 150 is formed in which the clay 150b is covered on the outside of the metal shell 150a and the groove 150c into which the insert is fitted is inserted inwards, and FIGS. 4C and 4D. In FIG. 1, a ring-shaped plug 150 ′ provided with a fixing ring 150 d of a refractory material for increasing a fixing force with the sleeve 140 is provided to the plug 150 having the same structure.

Meanwhile, FIG. 5 shows another conventional plug 150 ", which has a reinforcing portion 150e for reinforcing a portion where the converter outlet sleeve 140 into which the plug 150 " Reinforced plugs 150 ", which are integrally formed from the rear, are made of refractory material.

In FIG. 5D, the reinforcing portion 150e 'shows a plug 150 "

And, Figure 6 shows the state of use of such a conventional plug 150, it is used to plug the opening portion of the sleeve 140 to the outside of the outlet 140, sleeve 140 of the converter 100 is used In the end, the conventional outlet plugs 150 are plugs of a type fitted to the outside of the converter outlet sleeve 140.

That is, in detail in FIG. 7, by selecting one of the plugs 150 into the insertion portion 140a of the opening 140a outside the sleeve 140 of the converter tap hole 130 to perform an initial tapping operation of the converter. 7B and 7C, since the conventional plugs 150, 150 ', 150 ", 150 "' are fitted to the outside of the sleeve 140 of the converter outlet 130 regardless of their shape. As shown in the diagram, during the initial tapping work, the slab S floating on the molten steel m as long as the length D of the sleeve 140 also has the length D as long as the length D. 140, when the plug 150 is melted in the molten steel (m) or deviated from the sleeve opening (140a) by the tapping pressure of the molten steel is discharged to the ladle (L) through the tap hole 130, It is difficult to effectively prevent their ladle mixing.

At this time, the slag form of Figure 7c is shown as a cylindrical shape compared with the diameter and length of the sleeve for ease of understanding, it is not the shape of the actual slag.

Therefore, the ladle incorporation amount of the slag is large, leading to an excessive amount of non-metal oxides in the molten steel (m), which in turn causes serious quality problems that deteriorate the quality of the molten steel in the refining process.

That is, the conventional plug 150 shown in FIG. 7 is mixed with the initial tapping ladle L of the converter 100 in the process of tapping the molten steel m with the ladle L when the converter is pulled out. It does not perform the role of minimizing the amount of, which is because the conventional plug 150 is fitted to the outside of the outlet sleeve 140, the length of the converter outlet sleeve 140 of approximately 1.5-2.5m And since the slag (S) of the cylindrical shape of about 160-180mm diameter is always mixed in the ladle (L) at the beginning of the converter tapping, there was a problem of deteriorating the quality of the molten steel.

Furthermore, as shown in FIG. 1A, flame and dust f are generated during the oxygen blowing of the converter. Since the conventional plugs 150 are fitted outside the opening of the sleeve 140, The flame and dust (f) is filled inside the outlet sleeve 140 is overheated to shorten the life of the outlet sleeve 140, which in turn affects the life of the converter itself to repair and maintain the converter It is to increase the cost.

The present invention has been made in order to improve the various problems as described above, the purpose is to insert the plug deeply into the converter exit, the ladle mixing of the slag floating on the converter molten steel at the beginning of the converter tapping. The present invention provides a plug for a converter outlet sleeve which can be minimized to maintain a better quality of molten steel that is subjected to a refining process.

In addition, another object of the present invention, the plug can be inserted into the inner depth of the converter outlet sleeve to prevent the dust and flame generated during the converter blows build up in the sleeve to prevent overheating and early wear of the converter outlet sleeve It is an object of the present invention to provide a plug for a converter outlet sleeve which is effectively prevented to prolong the life of the converter outlet.

1 illustrates a typical converter operation,

(a) is a schematic diagram showing the drilling work in which the converter is upright;

(b) is a schematic diagram showing the operation of turning the converter according to the path change.

2 shows a typical converter exit,

(a) is a structural diagram showing a converter exit

(b) is a schematic perspective view of a converter exit

3 shows a plug used in a conventional converter outlet,

(a) is a structural diagram showing immediately before the plug is inserted into the converter outlet.

(b) is a schematic diagram showing a state in which the plug is inserted into the converter outlet.

Figure 4 shows a plug that is fitted to the exit of the conventional converter,

(a) is a sectional view showing a plug in which the shell is made of clay

(b) is a perspective view of FIG. 4a

(c) is a perspective view showing another conventional ring plug

(d) is a cross-sectional view of FIG. 4c

5 shows another conventional plug having a reinforcing material attached to an outer portion thereof,

(a) the cross section

(b) is a perspective view of FIG. 5a

(c) is a perspective view showing another type of conventional plug with a reinforcement attached thereto

(d) is a perspective view of a conventional plug with corrugated reinforcement attached thereto;

6 is a view illustrating a state of use of a plug to which a reinforcing member of the conventional outlet sleeve of FIG. 4 is attached,

(a) is a schematic diagram showing a state where the plug is inserted outside the converter outlet

(b) is an essential part of FIG. 6a

(c) is a partial cutaway perspective view showing a state of use of a plug that is fitted to the outside of the conventional tap hole

7 is a view for explaining a problem caused when using a conventional plug,

(a) is a structural diagram showing the state of use

(b) is a main diagram showing the state of use

(c) is a schematic diagram for explaining the amount of slag incorporated during converter tapping when using a conventional plug;

8 is a view illustrating a plug for a converter outlet sleeve that effectively blocks the ladle mixing of the slag when the converter descends according to the present invention.

(a) is an exploded perspective view

(b) is an exploded cross section

9 shows the plug for the converter outlet sleeve of the present invention,

(a) is a state of assembly

(b) the assembly section

(c) is a structural diagram showing a plug having a conical body

Figure 10 shows the plug for the converter outlet sleeve of the present invention,

(a) is a block diagram showing the use state of the plug

(b) is an essential part of FIG. 10a

(c) is a schematic diagram for explaining the amount of slag generated when the plug according to the present invention is used;

Figure 11 shows another embodiment of the plug of the present invention,

(a) is a state of assembly

(b) section

(c) is an essential part showing the elastic support

12 is a diagram showing a converter tapping work according to the prior art and the present invention,

(a) is a schematic diagram showing the amount of slag in a converter tapping operation using a conventional plug

(b) is a schematic diagram showing the amount of slag in the converter tapping operation using the plug according to the present invention

Explanation of symbols on the main parts of the drawings

1,1 ', 1a, 1a' .... plug 10 .... converter

12 .... converter hatch 20 .... sleeve

30,30 '.... body 40 .... cap

50,50 '.... Elastic support 60 .... Cover member

m .... molten steel S ... slag

As a technical configuration for achieving the above object, the present invention, the converter outlet sleeve plug for suppressing the outflow of slag injured on the molten steel in the initial stage of the converter in the converter steelmaking process for refining molten iron to molten steel. To

A hollow body inside; Wow,

A cap member covered with the inner diameter of the sleeve in front of the body; Wow,

An elastic support connected to the body to prevent the plug from being pushed from the inside of the sleeve to the outlet; And,

By inserting and fixed to the rear of the body to cover the body to seal the body; by providing a plug for the converter outlet sleeve consisting of.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 8 shows a converter outlet sleeve plug that effectively blocks the mixing of slag during the converter outgoing according to the present invention, Figure 8a is an exploded perspective view, Figure 8b is an exploded cross-sectional view.

First, the converter outlet sleeve plug (1) of the present invention shown in FIG. 8 is a slag injured on the molten steel at the beginning of the converter tapping in the converter 10, which is a steelmaking process for refining molten iron with molten steel (m). In order to suppress the leakage of the (S) is inserted deep inside the sleeve 20 which is installed inside the converter outlet 12, such a plug (1) of the present invention does not simply fit into the sleeve sleeve conventionally Deeply inserted into the inside of the 20, once inserted, the ladle incorporation of the slag S is prevented by the elastic supports 50 and 50 ', which will be described later, to prevent reverse movement in the converter outlet sleeve. There is a constructive feature in minimizing it.

On the other hand, as shown in Figure 8, the plug 1 of the present invention is composed of a body 30, a cap member 40, an elastic support 50, and a cover member 60, each of these configurations The elements are explained in more detail as follows.

As shown in FIG. 8, the body 30 of the plus (1) of the present invention has a hollow inside and is formed of a cylindrical body made of steel bar, and the rear of the body (30) is an opening (30a) The lid member 60 described next is fitted.

In this case, the body 30 is a cylindrical body whose diameter is slightly smaller than the inner diameter S2 (FIG. 9B) of the sleeve 20 of the converter outlet 12, which is described below. This is because it is covered in the upper portion, but if the diameter of the plug body 30 is formed too small compared to the inner diameter (S2) of the sleeve, the thickness of the cap member 40 is excessively thick, so as to increase the manufacturing cost slightly smaller It is preferable.

Next, in FIG. 8, the cap member 40 of the plug 1 according to the present invention is covered to correspond to the inner diameter S2 of the sleeve 20 in front of the body 30. 40 is made of a refractory material, that is, a ceramic material, and the inside of the cylindrical body is hollowed so as to be covered on the upper portion of the cylindrical body 30, the cap member 40 is made of a refractory material, but the slab only at the beginning when the converter descends. When the (S) is prevented from flowing out and the converter is completed and the tapping of the inner molten steel (m) is made, the molten steel must be smoothly removed so that the initial slag can be discharged only for a predetermined time. It is only necessary to prevent the slag from flowing out until the converter is completed and the molten steel is tapped out.

Accordingly, the outer diameter S1 of the cap member 40 is formed to coincide with the inner diameter S2 of the converter outlet sleeve 20, as shown in FIG. 9, and if possible, the sleeve 20 of the plug 1. It is desirable to effectively block the outflow of slag by making it close to the insert.

However, it may be preferable that the diameter S1 of the cap member 40 has a slight tolerance than the inner diameter S2 of the sleeve 20 so that the plug 1 can be inserted into the sleeve 20. .

Next, FIG. 8 illustrates an elastic support 50 which is a constitutional feature of the present invention. The elastic support 50 of the present invention is connected to the body 30 so that a plug is installed from the inside of the sleeve to the outlet. It is configured to prevent the push.

That is, as shown in Figure 8, the plug elastic support member 50 of the present invention is composed of a refractory support pipe formed to be bent in an arc shape protruding both ends thereof through the support groove (30b) formed in the body (30). It is.

Therefore, after the plug 1 is deeply inserted into the sleeve 20, the elastic support 50, which is the bent refractory support pipe, may have both ends of the sleeve 30 protruding from the body 30 of the elastic support 50. Since it is caught and fixed on the inner circumferential surface of 20), the plug 1 is prevented from leaving the sleeve 20 from the outside even when the converter is in the initial stage of tapping, so that the slag S is leaked during tapping. To effectively block it.

However, it is important at this time, the body protrusion length of the refractory support pipe 50 is to be formed to be adjusted to match the inner diameter (S2) of the converter outlet sleeve 20, if the body of the support pipe (50) 30) If the protruding length is too long, both ends of the support pipe 50 are excessively in close contact with the inner circumferential surface of the plug from the sleeve insertion of the plug 1, and crush the portion of the body 30 into which the support pipe 50 is inserted, In this case, since the inner circumferential surface of the sleeve 20 is damaged, the body protrusion length of the support pipe 50 which is the elastic support should be adjusted to the inner diameter S2 of the sleeve 20.

Next, the plug cover member 60 of the present invention shown in FIG. 8 is inserted into and fixed to the rear of the body 30 to seal the body 30. Such a cover member 60 is a body ( While closing the rear opening 30a of 30), although not shown in the drawing, the insertion table is fitted when the plug 1 is inserted into the sleeve.

That is, as shown in Figure 8, the cover member 60 is formed integrally with the insert portion (60a) and stepped (60b) fitted to the rear opening (30a) of the body 30, the cover In the center of the member 60, an opening 60c into which an insertion table for inserting a tap hole is inserted is integrally formed.

Next, in FIGS. 9A and 9B, each component of the plug 1 according to the present invention, that is, the body 30 and the cap member 40 covered thereon, and the elastic support pipe 50 connected to the body 30 are shown. ) And the cover member 60 inserted into the rear of the body 30 is shown, and as shown in Figure 9b, the outer diameter (S1) of the cap member 40 of the sleeve 20 It is formed so as to coincide with the inner diameter S2.

Next, Figure 9c shows another embodiment of the plug of the present invention, the other plug (1a) of the present invention as a conical cylindrical body 30 'having a cross section having a short side and a long side rhombus. In this case, the long side of the conical plug body (30 ') is formed to substantially match the inner diameter (S2) of the sleeve (20).

Therefore, the other plug 1a of the present invention has a long side at the rear side of the body 30 so that it matches the inner diameter S2 of the sleeve 20, so that the cap member 40 is in the front of the plug as a whole. In close contact with the long side of the body 30 on the rear side, the manufacture of the body 30 'is a little complicated, but the outflow of the slag S can be more reliably blocked.

Next, Figure 10 shows the use state of the present invention plus (1), as shown in Figures 10a and 10b, the plug (1) of the present invention as the insert (not shown) and the shell (10a) When deeply inserted into the sleeve 20 of the converter tap opening 12 of the refractory material 10b, while the support pipe 50 blocks the reverse movement of the plug 1, the outflow of slag at the time of the converter additional tapping is blocked. do.

In particular, as shown in Fig. 10c, since the plug 1 of the present invention is inserted deep into the sleeve 20, the slag amount of the slag that is conventionally discharged as in Fig. 7c is similar to the sleeve length D, In the case of using the plug of the present invention, it can be seen that the amount D 'of the slag S is considerably reduced, and the slag form of FIG. 10C is also for explanatory purposes.

Therefore, since the plug (1) (1a) of the present invention reduces the amount of outflow of slag, not only improves the quality of the molten steel, but also the inflow of the sleeve or the inlet of dust or flame (f) as shown in Figure 1a can be blocked at the sleeve inlet Therefore, the service life of a sleeve is also extended.

Next, Figure 11a shows another embodiment of the plug of the present invention, the plug (1 ') of the present invention as described above, the cylindrical body 30 and the cap member 40 and the cover member 60 The same is true, but the elastic support is formed of a skirt-type elastic support 50 '.

That is, as shown in Figure 11c, the skirt-shaped elastic support (50 ') is made by cutting a thin iron plate and rolling one side portion continuously to form a skirt, then fixed to the center outer peripheral surface of the body 30 by welding or the like. It is.

Therefore, after the plug 1 'is deeply inserted into the sleeve 20, the skirt-like elastic support 50' is in close contact with the inner circumferential surface of the sleeve to prevent the plug from moving backwards. When fixing the body 30 of the 50 ', it may be desirable to fix the end by slightly lifting the end thereof. Such a skirt-type elastic support 50' is more difficult to manufacture than the support pipe, but the plug 1 ' It is useful in that the sleeve is inserted more smoothly.

Next, FIG. 11B shows a plug 1a 'having the body 30' made of a conical cylindrical body having a rhombus cross section. In this case, the inner diameter T of the skirt-like elastic support 50 'is the body 30. FIG. ') The welding position of the skirt elastic support 50' may be constant if it matches the diameter T of the central portion.

Next, FIG. 12 shows the slag outflow amount y1 (y2) when the conventional plug 150 and the plug 1 of the present invention are used. As shown in FIG. 12A, the conventional plug 150 is shown. In the case of using, the amount of slag Y1 mixed in the ladle L is large, but as shown in FIG. 12B, in the case of using the plug 1 of the present invention, the amount of slag mixed in the ladle L ( Y2) is very low, which in turn improves the quality of molten steel.

As described above, according to the converter outlet sleeve plug which effectively blocks the ladle mixing of the slag when the converter moves out, the ladle mixing during the slag floating on the converter molten steel at the initial stage of the converter can be minimized and thus the refining process is performed. It provides an effect that can better maintain the quality of the molten steel to the cheer ladle.

Moreover, the plug for the converter outlet sleeve can be inserted into the inside of the converter outlet sleeve to prevent dust and flames generated during the converter blow-up and accumulate inside the sleeve, thereby effectively preventing overheating and early wear of the converter outlet sleeve. This prevents the extension of the service life of the converter outlet and, consequently, provides an excellent effect of reducing the cost of maintenance and maintenance of the converter.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to know that those who have knowledge of this can easily know.

Claims (5)

Plug (1) for converter outlet sleeve (20) for suppressing the outflow of slag (S) floating on the molten steel at the beginning of the converter tapping in the converter (10), which is a steelmaking process for refining molten iron with molten steel (m) To Body 30 hollow inside; and, A cap member 40 covered with the inner diameter of the sleeve 20 in front of the body 30; and, An elastic support 50 connected to the body 30 to prevent the plug from being pushed from the inside of the sleeve to the outlet; And, Plug for the converter outlet sleeve to effectively block the ladle mixing of the slag during the conversion, characterized in that consisting of; characterized in that consisting of; The method of claim 1, wherein the plug body 30 is composed of a cylindrical body made of steel bar hollow inside and the rear, The cap member 40 is formed in a cylindrical shape made of a refractory material to be covered in front of the cylindrical body 30, the outer diameter (S1) of the cap member 40 is the inner diameter of the converter outlet sleeve 20 ( Formed in accordance with S2), The cover member 60 is integrally formed with an inserting portion 60a and a stepped portion 60b fitted into the rear opening 30a of the body 30, and a tap hole of the plug is formed at the center of the cover member 60. Plug for converter outlet sleeve, characterized in that the opening (60c) in which the insert for insertion is inserted integrally formed The method of claim 1, wherein the plug body 30 is formed of a conical cylindrical body 30 'having a short side and a long side cross-section rhombus, the long side of the body 30' is the inner diameter (S2) of the sleeve 20 Plug for converter outlet sleeve, characterized in that it is configured to match The converter outlet according to claim 1, wherein the plug elastic support member (50) is composed of a refractory support pipe bent in an arc shape, the both ends of which protrude from the support groove (30b) formed in the body (30). Plug for sleeve 2. The plug for converter outlet sleeve according to claim 1, wherein the plug elastic support member (50) is made of a skirt-type elastic support member (50 ') made of an iron plate.