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KR101789571B1 - Apparatus for preventing nozzle clogging - Google Patents

Apparatus for preventing nozzle clogging Download PDF

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Publication number
KR101789571B1
KR101789571B1 KR1020150185009A KR20150185009A KR101789571B1 KR 101789571 B1 KR101789571 B1 KR 101789571B1 KR 1020150185009 A KR1020150185009 A KR 1020150185009A KR 20150185009 A KR20150185009 A KR 20150185009A KR 101789571 B1 KR101789571 B1 KR 101789571B1
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KR
South Korea
Prior art keywords
nozzle
vibration
immersion nozzle
mold
container
Prior art date
Application number
KR1020150185009A
Other languages
Korean (ko)
Other versions
KR20170075400A (en
Inventor
서휘
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to KR1020150185009A priority Critical patent/KR101789571B1/en
Publication of KR20170075400A publication Critical patent/KR20170075400A/en
Application granted granted Critical
Publication of KR101789571B1 publication Critical patent/KR101789571B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/62—Pouring-nozzles with stirring or vibrating means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The present invention relates to an apparatus for preventing clogging of a nozzle, and more particularly, to an apparatus for preventing clogging of a nozzle for preventing inclusion on the inner wall of a nozzle during a continuous casting process.
An apparatus for preventing clogging of a nozzle according to an embodiment of the present invention is an apparatus for preventing clogging of a nozzle for supplying molten steel introduced from a first vessel to a second vessel through an inlet formed at an upper portion thereof and a discharge port formed at a lower portion thereof, A vibrating part for vibrating the second container; And a vibration applying portion for vibrating the nozzle substantially the same as the second container.

Description

[0001] APPARATUS FOR PREVENTING NOZZLE CLOGGING [0002]

The present invention relates to an apparatus for preventing clogging of a nozzle, and more particularly, to an apparatus for preventing clogging of a nozzle for preventing inclusion on the inner wall of a nozzle during a continuous casting process.

In a typical continuous casting process, the molten steel contained in the ladle is injected into the tundish, the molten steel injected from the tundish is continuously injected into the mold to cool the molten steel first, and then the cooling water is sprayed on the surface of the primary cooled steel And cools the molten steel according to cooling the steel to produce a cast steel.

In the continuous casting process, the immersion nozzle is a nozzle structure for injecting molten steel contained in a tundish into a mold, and is immersed under the slag line at the bottom of the slag. The immersion nozzle serves to keep the molten steel flowing into the mold, stabilize the molten steel flow in the mold, and block the inflow of air, and is usually made of refractory material.

In the molten steel, alumina (Al 2 O 3 ) inclusions exist, and micro-inclusions which are not removed by floating separation adhere to the inner wall of the immersion nozzle connecting the tundish and the mold, thereby causing the immersion nozzle to become clogged. However, there is no technique to completely prevent clogging of the immersion nozzle until now, and it is known that the complete removal of the immersion nozzle clogging is difficult as long as inclusions in the molten steel generated in the deoxidation are present in the manufacturing process.

Such clogging of the immersion nozzle has a considerably negative effect on the operation. For example, difficulties in securing a discharge amount due to clogging of nozzles, hunting at a mold level caused by repetition of nozzle clogging and punching, and stoppage of casting due to rapid nozzle clogging are typical problems. Accordingly, there is a need for a method for preventing the inclusion of the inclusion in the immersion nozzle from clogging the immersion nozzle.

KR 10-2001-0025910 A

An object of the present invention is to provide an apparatus for preventing clogging of a nozzle that can prevent nozzle clogging due to inclusion in a nozzle.

The present invention also provides an apparatus for preventing clogging of a nozzle that prevents inclusions from adhering to the inner wall of the nozzle and prevents the adhered inclusions from growing.

An apparatus for preventing clogging of a nozzle according to an embodiment of the present invention is an apparatus for preventing clogging of a nozzle for supplying molten steel introduced from a first vessel to a second vessel through an inlet port formed at an upper portion thereof and a discharge port formed at a lower portion thereof, A vibrating part for vibrating the second container; And a vibration applying portion for vibrating the nozzle substantially the same as the second container.

The vibration applying unit may transmit vibration of the second container to the nozzle.

The vibrating portion can vibrate the second container in the vertical direction.

The vibration applying unit may include a connection member having one end fixed to the outer wall of the nozzle and the other end fixed to the side wall of the second container.

And a nozzle holder installed on a bottom surface of the first container to support an upper portion of the nozzle.

The upper portion of the nozzle may have a latching portion protruding outwardly along the periphery thereof. The nozzle holder may be formed with a receiving portion which is inserted inwardly to receive the latching portion.

The inner wall of the nozzle holder which is in contact with the nozzle may have a concavo-convex shape.

The first and second containers may be tundishes and molds, and the nozzle may be an immersion nozzle.

According to the apparatus for preventing clogging of the nozzle according to the embodiment of the present invention, the immersion nozzle is vibrated substantially in the same manner as the mold to which the molten steel is supplied, and clogging is caused by accumulation of inclusions in the immersion nozzle without changing the molten steel flow Can be prevented.

In addition, by matching the vibration width and the vibration period of the immersion nozzle with the vibration width and the vibration period at the vibration of the mold, it is possible to minimize the change in the flow of the molten steel due to the mold vibration which is not generally considered in the designing process, Or predicted results in the initial design according to the discharge amount control can be secured as it is.

That is, according to the apparatus for preventing clogging of the nozzle according to the embodiment of the present invention, the clogging phenomenon of the immersion nozzle can be effectively prevented so that the inclusions are mixed into the mold or the slag of the bath surface is mixed, The productivity of the high-clean steel production and the continuous casting process can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic representation of a typical continuous casting installation.
2 is a cross-sectional view showing a state in which an inclusion is attached to a nozzle.
FIG. 3 is a view showing a device for preventing clogging of a nozzle according to an embodiment of the present invention. FIG.
4 is a view showing a state where a nozzle according to an embodiment of the present invention is coupled with a nozzle holder;
5 is a view showing a state in which a nozzle vibrates according to an embodiment of the present invention.
6 is a view showing a state where a nozzle according to another embodiment of the present invention is coupled with a nozzle holder;

The apparatus for preventing clogging of the nozzle according to the present invention can vibrate the nozzle substantially the same as the second container to which the molten steel is supplied so as to prevent clogging of the nozzle due to inclusions being accumulated in the nozzle without changing the molten steel flow It presents the technical features.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Wherein like reference numerals refer to like elements throughout.

In general, the continuous casting facility receives the molten steel produced in the steelmaking process in a ladle, receives it in a tundish using a shroud nozzle in a continuous casting process, then supplies it to a mold by an immersion nozzle, .

1 is a schematic view showing a general continuous casting facility; Referring to FIG. 1, the continuous casting equipment will be described in more detail. First, the ladle 10, which transports molten steel, is placed on the ladle turret unit 20 and placed on top of the tundish 30 in turn. At this time, the ladle turret unit 20 is provided with the ladle pedestal 13, which is provided with the ladle pedestal 23, which is capable of placing the ladle 10 on both sides of the swing tower 21, Two or more ladles 10 are placed and the ladle 10 is alternately placed on top of the tundish 30 by the rotation of the swing tower 21. [ A plurality of pinch rolls 41 for guiding the cast steel are disposed at the lower portion of the mold 40. The casting rolls 40 are disposed at the lower portion of the tundish 30, Respectively. At this time, a collector nozzle 11 is provided on the bottom of the ladle 10 and connected to the collector nozzle 11 to pour molten steel in the ladle 10 into the tundish 30 And an immersion nozzle 100 as a passage for discharging molten steel to the mold 40 is installed on the bottom surface of the tundish 30. Here, reference numeral 50 denotes a nozzle mounting unit.

With respect to such a continuous casting facility, in the embodiment of the present invention, the first and second containers correspond to the tundish and the mold, respectively, and the nozzle means an immersion nozzle, It is needless to say that the present invention is applicable to any kind of container and nozzle in which molten steel accommodated in the first container can be supplied to the second container and the inclusion can be attached to the inner wall.

2 is a cross-sectional view showing a state in which an inclusion is attached to a nozzle.

Aluminum (Al 2 O 3 ) is added as a method for removing oxygen in charcoal in the refining process during the integrated steelmaking process. The introduced aluminum reacts with oxygen to form an inclusion, that is, alumina. Of these, generally large inclusions are separated by floating and removed, but inclusions having a small size are moved in accordance with the flow of molten steel. In the continuous casting process, the inclusions may be separated again from the tundish 30, but they are attached to the inner wall of the nozzle by reacting with the refractory of the immersion nozzle 100 in the process of moving to the mold 40, So that they are accumulated in the immersion nozzle 100 and clogging occurs.

The accumulation of the inclusions in the immersion nozzle 100 generated in the above process changes the flow of the molten steel in the mold 40 and is generally discharged from the discharge port 120 formed on both sides of the immersion nozzle 100 The amount of molten steel will be different from each other. This unbalance of the amount of discharged molten steel causes instability of the bath surface in the mold 40, and slag of the bath surface is mixed due to the vortex phenomenon or the like, and is adhered to the solidification layer of the casting product, thereby causing defects of the product.

Accordingly, a number of techniques have been developed for preventing the accumulation of inclusions in the immersion nozzle 100 and for preventing the clogging of the nozzle and the inclusion of inclusions or slags. This is mainly because the composition of the refractory forming the immersion nozzle 100 A method of changing the sintering method, introducing an inert gas or vibrating the immersion nozzle 100, or the like is used.

Here, the method of vibrating the immersion nozzle 100 is a technique for imparting vibration to the immersion nozzle 100 to prevent inclusion accumulation. If the immersion nozzle 100 is moved in a suitable vertical direction, the effect of preventing inclusion adherence and adhered inclusions from growing on the inner wall of the immersion nozzle 100 can be obtained.

However, in the case of the immersion nozzle 100, the immersion nozzle 100 is not moved during the continuous casting process. This is because when the flow of the molten steel from the discharge port of the immersion nozzle 100 is not normal, Because. Therefore, the vibration of the immersion nozzle 100 is performed when there is a risk that clogging of the nozzle may occur due to proper accumulation of inclusions by checking the nozzle clogging index during casting, and thereby the inclusion should be carefully carried out so that the inclusion does not fall off Do not make large changes in the molten steel flow.

In order to prevent the molten steel from adhering to the wall surface of the mold 40 in the continuous casting step, a separate vibration part 400 is provided to perform the reciprocating movement of the mold 40, that is, the mold oscillation do. Here, in the case of performing the vibration of the mold 40, the vibration of the immersion nozzle 100 should have the same vibration width and vibration period as the vibration of the mold 40. That is, the mold 40 positioned below the immersion nozzle 100 continuously vibrates in the up and down direction at a constant vibration width and vibration period during casting. When the immersion nozzle 100 vibrates with a vibration width different from that of the mold 40, Period, it causes a large change in the flow of molten steel, which causes inclusion of inclusions.

FIG. 3 is a view showing an apparatus for preventing clogging of a nozzle according to an embodiment of the present invention.

3, an apparatus for preventing clogging of a nozzle according to an embodiment of the present invention includes an inlet port formed at an upper portion thereof and a discharge port formed at a lower portion thereof to block clogging of nozzles for supplying molten steel introduced from the first container to the second container (400) for vibrating the second container; And a vibration applying portion for vibrating the nozzle substantially the same as the second container.

That is, the apparatus for preventing clogging of the nozzle according to the embodiment of the present invention can prevent the clogging of the nozzle 40 when the vibrating unit 400 vibrates the second container, that is, the mold 40 in the vertical direction, It is possible to prevent the inclusion adherence and the adhered inclusions from growing on the inner wall of the immersion nozzle 100 without changing the molten steel flow by vibrating the immersion nozzle 100 in the vibration period.

Here, the same vibration means that the vibration width and the vibration period are substantially the same, and substantially the same vibration width and vibration period are determined by the vibration width of the mold 40 and the vibration period of the vibration width of the immersion nozzle 100, The same in terms of period and numerical value, or the same within a range including tolerance range by design structure and frictional force. The same oscillation width and oscillation period described below are within the substantially same range as described above.

Further, in order to vibrate the immersion nozzle 100 so as to have the same vibration width and vibration period as the mold 40, the vibration applying section vibrates the immersion nozzle 100 separately so as to have the same vibration width and vibration period as the mold 40 The vibrating width and the vibration period of the mold 40 may be determined by the vibration width of the immersion nozzle 100 and the vibration frequency of the mold 40 when the vibration of the mold 40 vibrating by the vibration unit 400 is directly transmitted to the immersion nozzle 100. [ It is possible to more exactly match the period.

The vibration applying unit is provided with one end fixed to the outer wall of the immersion nozzle 100 and the other end fixed to the side wall of the mold 40 200). That is, one end of the connecting member 200 is fixed to the outer wall of the immersion nozzle 100 exposed between the tundish 30 and the mold 40, and the other end is fixed to the side wall of the mold 40, The vibrations of the mold 40 by the immersion nozzle 400 can be transmitted to the immersion nozzle 100 as it is. Various coupling structures can be applied to fix the connection member 200 to the immersion nozzle 100 or the mold 40. Although not shown in FIG. 3, in order to facilitate coupling and separation, A coupling structure may be used in which a groove is formed in the outer wall of the coupling member 100 and one end of the coupling member 200 is inserted and fixed in the groove.

FIG. 4 is a view showing a state where a nozzle according to an embodiment of the present invention is coupled with a nozzle holder, and FIG. 5 is a view showing a state in which a nozzle vibrates according to an embodiment of the present invention.

4 and 5, an apparatus for preventing clogging of a nozzle according to an embodiment of the present invention includes a first container, that is, a nozzle holder (not shown) installed on the bottom surface of the tundish 30 for supporting an upper portion of the immersion nozzle 100 300).

In general, in a continuous casting process, a nozzle holder 300, that is, a well block is installed at the lower portion of the tundish 30 to cover and fix the upper portion of the immersion nozzle 100 to the outside. Generally, the nozzle holder 300 is not fixedly coupled to the immersion nozzle 100, but the inner surface of the nozzle holder 300 is in contact with the outer peripheral surface of the upper portion of the immersion nozzle 100 over the entire surface to generate a large frictional force, The vibration of the immersion nozzle 100 is restricted.

Accordingly, in the apparatus for preventing clogging of the nozzle according to the embodiment of the present invention, the upper part of the immersion nozzle 100 is formed with the engaging part 120 protruding outward along the periphery, and the upper part of the immersion nozzle 100 The nozzle holder 300 may be formed with a receiving part 320 which is inserted into the nozzle holder 300 to receive the engaging part 120.

The engaging portion 120 formed on the immersion nozzle 100 may be integrally formed with the immersion nozzle 100 or may be formed by fixing another ring-shaped member to the upper portion of the immersion nozzle 100. When a separate ring-like member is used, the latching part 120 can be formed of a material different from the immersion nozzle 100, that is, a material having high temperature durability without being worn for a long time even with a large number of vibrations, And may be formed of stainless steel to prevent deterioration due to contact with the substrate. The engaging portion 120 may be provided on the upper portion of the immersion nozzle 100 or may be formed as a separate cylindrical structure provided on the outer peripheral surface of the upper portion of the immersion nozzle 100, , And a separate ring-shaped member may be combined.

The accommodating portion 320 formed in the nozzle holder 300 receives the engaging portion 120 formed in the upper portion of the immersion nozzle 100. The depth d at which the accommodating portion 320 is inserted may be the same as the length of the engaging portion 120 protruding outward of the immersion nozzle 100 or may be set such that the engaging portion 120 is located outside the immersion nozzle 100 It may be formed deeper than the protruding length. When the depth d of the receiving portion 320 is equal to the length of the engaging portion 120 protruding outward from the immersion nozzle 100, the nozzle holder 300 may be provided with the immersion nozzle 100 The depth d at which the receiving portion 320 is inserted is formed to be deeper than the length at which the engaging portion 120 protrudes to the outside of the immersion nozzle 100, 300 and the immersion nozzle 100 can be minimized. Accordingly, the depth d at which the receiving portion 320 is inserted can be selectively applied in consideration of the fixing strength and the frictional force of the immersion nozzle 100 in the nozzle holder 300.

The height h of the receiving part 320 is longer than the length of the locking part 120 reciprocating in the vertical direction due to the vibration transmitted to the immersion nozzle 100 by the vibration of the mold 40. That is, the length of the receiving portion 320 excluding the height of the latching portion 120 is formed to be larger than the vibration width of the vibration of the mold 40. 5 (a), the immersion nozzle 100 is lifted by the vibration of the mold 40 to a maximum vibration width, or the immersion nozzle 100 is immersed in the mold 40 by the vibration of the mold 40 as shown in FIG. 5 (b) The engaging portion 120 can be positioned in the accommodating portion 320 even when the nozzle 100 is lowered by the maximum vibration width and when the abnormal impact is generated in the immersion nozzle 100, It is possible to prevent the nozzle 100 from being detached.

6 is a view showing a state where a nozzle according to another embodiment of the present invention is coupled with a nozzle holder.

Referring to FIG. 6, an apparatus for preventing clogging of a nozzle according to another exemplary embodiment of the present invention includes a nozzle 120 having a hook 120 protruding outward along a periphery thereof, The inner wall of the nozzle holder 300 contacting with the nozzle is formed in a concavo-convex shape 340. In this case,

The concave and convex shape 340 may have a shape in which a plurality of recesses and convex portions alternately repeat in the longitudinal direction of the nozzle holder 300, that is, from the upper end to the lower end, and the entire inner wall of the nozzle holder 300 may be embossed . By forming the inner wall of the nozzle holder 300 into the concave and convex shape 340 as described above, the contact area between the nozzle holder 300 and the immersion nozzle 100 is minimized and the frictional force is reduced, Deterioration problems can be prevented.

In this manner, when the immersion nozzle 100 is vibrated, it is possible to prevent the inclusion from being attached to the inner wall of the immersion nozzle 100 firstly, or to prevent the inclusion from being grown, thereby preventing accumulation of inclusions. In addition, it is possible to prevent clogging of the immersion nozzle 100 by preventing accumulation of inclusions in the immersion nozzle 100, and it is possible to prevent inclusion of the inclusions into the mold 40 or to mix the slag of the bath surface with the solidification layer So that product defects can be prevented from occurring.

Second, by matching the vibration width and the vibration period of the immersion nozzle 100 with the vibration width and the vibration period of the vibration of the mold 40, it is possible to obtain a casting effect according to the molten steel flow which was initially designed. That is, in the continuous casting process, the molten steel flow is first calculated and then the shape of the discharge port or the discharge amount of the immersion nozzle 100 is determined. In this case, the parameter due to the vibration of the mold 40 is not considered. Therefore, by vibrating the immersion nozzle 100 so as to have the same vibration width and vibration period as the vibration of the mold 40 in order to minimize the change of the molten steel flow by the vibration of the mold 40, the application of the variable by the vibration of the mold 40 It is possible to obtain the predicted results at the time of the initial design.

While the preferred embodiments of the present invention have been described and illustrated above using specific terms, such terms are used only for the purpose of clarifying the invention, and the embodiments of the present invention and the described terminology are intended to be illustrative, It will be obvious that various changes and modifications can be made without departing from the spirit and scope of the invention. Such modified embodiments should not be individually understood from the spirit and scope of the present invention, but should be regarded as being within the scope of the claims of the present invention.

30: Tundish 40: Mold
100: immersion nozzle 120:
200: connecting member 300: nozzle holder
320: accommodating part 400: vibrating part

Claims (8)

An apparatus for preventing clogging of a nozzle for supplying molten steel introduced from a first vessel to a second vessel, the vessel having an inlet formed at an upper portion thereof and a discharge port formed at a lower portion thereof,
A vibrating part for vibrating the second container; And
And a vibration applying portion for vibrating the nozzle substantially the same as the second container,
Wherein the vibration applying unit transmits the vibration of the second container to the nozzle.
delete The method according to claim 1,
And the vibrating unit vibrates the second container in the vertical direction.
The method according to claim 1,
The vibration-
And a connecting member having one end fixed to the outer wall of the nozzle and the other end fixed to a side wall of the second container.
The method according to claim 1,
And a nozzle holder installed on a bottom surface of the first container to support an upper portion of the nozzle.
The method of claim 5,
The nozzle has an upper portion formed with an engaging portion protruding outward along the periphery,
Wherein the nozzle holder is formed with a receiving portion that is embedded inward to receive the engaging portion.
The method according to claim 5 or 6,
Wherein the inner wall of the nozzle holder in contact with the nozzle is formed in a concavo-convex shape.
The method according to any one of claims 1 and 3 to 6,
Wherein the first and second containers are a tundish and a mold, and the nozzle is an immersion nozzle.
KR1020150185009A 2015-12-23 2015-12-23 Apparatus for preventing nozzle clogging KR101789571B1 (en)

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KR101789571B1 true KR101789571B1 (en) 2017-10-25

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4351502B2 (en) * 2003-09-02 2009-10-28 新日本製鐵株式会社 Electromagnetic casting apparatus and electromagnetic casting method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4351502B2 (en) * 2003-09-02 2009-10-28 新日本製鐵株式会社 Electromagnetic casting apparatus and electromagnetic casting method

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