CN211708097U - Double argon blowing long nozzle - Google Patents

Abstract

The utility model discloses a double-blowing argon long nozzle, which comprises a main body, a slag line part, an anti-explosion lining and an iron shell; the anti-explosion lining is arranged on the inner wall of the main body and the slag line part, and the upper end of the main body is a bowl There is an air blowing nozzle on one side of the bowl structure; the bowl mouth of the bowl structure is provided with a number of grooves, and an annular groove is arranged on the inner wall of the bowl structure, and the annular groove is connected with the bowl The structure is coaxial; an annular air cavity is built between the iron shell and the main body, and the annular air cavity is used for connecting the groove, the through hole and the air blowing nozzle. Double sealing the molten steel in the long nozzle to isolate oxygen; improve the purity of molten steel and ensure the service life of the long nozzle; the annular air cavity is connected to the middle annular groove of the bowl structure and several grooves on the top at the same time. It ensures the smooth flow of argon gas and forms a tight gas wall in time.

Description

Double blowing argon long nozzle

technical field

The utility model relates to the field of continuous casting equipment, in particular to a double-blowing argon long nozzle.

Background technique

The long shroud is an important part connecting the tundish and the tundish in the continuous casting operation. The upper part is matched with the upper shroud of the tundish, and the lower part is inserted into the tundish. In normal use, it is inserted about 150-300mm below the liquid level of the tundish, which serves to connect the tundish. With the tundish, it can prevent the secondary oxidation of molten steel and prevent the splash of molten steel. Requires no-bake use, multiple uses. It is an indispensable and important functional refractory material to realize molten steel protection casting and improve product quality, and its use effect will directly affect the smooth running and quality stability of the entire continuous casting process. During the flow of molten steel from the ladle to the tundish, the effect of protective pouring depends on the sealing effect between the ladle shroud and the long shroud.

Usually, the contact surface between the long nozzle and the ladle nozzle is a straight conical surface, and the two are sealed by a flexible refractory fiber gasket. However, this matching accuracy is controlled by dimensional tolerances, mold wear, burning damage during production and molten steel. Due to the influence of factors such as erosion, the effect of sealing is actually difficult to control, which causes fluctuations in the flow and pressure of argon, which in turn causes fluctuations in the pouring effect of molten steel protection. Simply adjusting the amount of argon cannot solve this problem. . The existing Chinese patent CN208322099U discloses a curved-surface sealed two-way argon blowing long nozzle structure, including the contact surface between the long nozzle and the ladle lower nozzle is a bell mouth-shaped curved surface, and a flexible refractory fiber gasket is arranged between the long nozzle and the ladle nozzle, The upper part of the shroud is provided with an upper argon gas supply inlet that communicates with the contact surface of the shroud and the ladle lower nozzle, and a lower argon gas inlet that communicates with the steel inlet of the shroud is arranged below the contact surface of the shroud and the ladle lower nozzle. Air supply inlet. The utility model only sets two argon gas inlets in the middle and the bottom of the bowl area of the long nozzle, and cannot achieve the sealing function. Existing Chinese patent CN104139179B discloses a multifunctional long nozzle for blowing argon, the bowl part of the long nozzle is provided with a blowing pipe, a sealing conduit and a sealing ventilation ring; the lower part has an annular ventilation chamber and a ventilation hole, and the argon blowing pipe is connected to the blowing pipe and the annular ventilation ring. Between the chambers, the ratio of the cross-sectional area of the argon blowing conduit to the cross-sectional area of the sealed conduit is set to be 1:(1-5). On the circumference of the annular ventilation chamber, at least one row of evenly distributed ventilation holes is opened to the inside of the shroud body, and there are at least four ventilation holes in each row. In the process of pouring molten steel from the ladle to the tundish, the argon gas introduced from the outside is connected to the blowing pipe, and then pressurized into the airtight vent ring and the annular ventilating chamber according to the flow ratio of 1:(1-5) respectively; in this invention The vent hole and the annular vent chamber are set at 1/2 of the height of the long nozzle body. Although the shear force of the molten steel flow can be used to break the bubbles into finer bubbles, it is easy to capture debris, but also because of the flow of molten steel. It will be detrimental to the floating of debris.

Therefore, it is urgent to design a double-blowing argon shroud that can achieve complete sealing and billet cleaning at the same time.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems in the prior art, the utility model provides a double-blowing argon long nozzle, which can not only improve the cleanliness of the casting billet, but more importantly, can completely isolate oxygen from the molten steel.

To achieve the above object, the utility model adopts the following technical solutions:

The double-blowing argon long nozzle includes a main body, a slag line part, an anti-explosion lining and an iron shell. The anti-explosion lining is arranged on the inner wall of the main body and the slag line part to form a central hole; the upper end of the main body is a bowl structure, The double-blowing argon long nozzle also includes:

an air blowing nozzle, the air blowing nozzle is arranged on one side of the bowl structure;

a groove, the groove is arranged at the bowl mouth position of the bowl structure;

an annular groove, the annular groove is provided on the inner wall of the bowl structure, and the annular groove is coaxial with the bowl structure;

An annular air cavity, the annular air cavity is arranged between the iron shell and the body, and the annular air cavity is used for connecting the groove, the through hole and the blowing nozzle.

Preferably, the annular groove is connected with the annular air cavity through a through hole.

Preferably, the grooves are distributed at equal intervals along the circumference of the bowl mouth.

Preferably, the width of the groove is in the range of 18-22mm and the depth is in the range of 1-3mm.

Preferably, a ventilation net is provided between the blowing nozzle and the annular air cavity.

Preferably, the annular air cavity is sleeved with a ventilating net.

Preferably, the breathable mesh adopts a diffused breathable functional material or a breathable annular seam.

Preferably, the argon flow rate in the groove is 5.5-6L/min.

Preferably, the argon flow rate in the through hole is 2.5-3.5 L/min.

Preferably, the middle and upper part of the body is provided with a reducing portion.

Preferably, the upper end of the iron shell is fixed on the top of the double-blowing argon shroud, and the bottom end of the iron shell is fixed at a distance of 25-35 mm from the bottom end of the reducing portion.

Preferably, along the axial direction of the central hole, the diameter of the central hole increases linearly from top to bottom.

Preferably, a right-angle transition between the bowl bottom and the inner wall of the bowl structure forms a ladle connection platform.

The technical scheme of the present utility model has the following technical effects relative to the prior art:

1. The utility model is provided with a number of grooves at the top of the bowl structure and an annular groove in the middle. The two types of grooves work together to double seal the molten steel in the long nozzle and isolate oxygen; Improve the purity of molten steel and ensure the service life of the long nozzle.

2. The utility model is provided with an annular air cavity, which is connected with the annular groove in the middle of the bowl structure and several grooves on the top, which ensures the smooth flow of argon gas and forms a tight air wall in time.

3. The center hole of the utility model is narrow at the top and wide at the bottom, which can effectively reduce the flow rate of molten steel and reduce the scouring of the inner wall.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of the present utility model in Embodiment 1. FIG.

FIG. 2 is a schematic diagram of the groove structure according to the present invention.

FIG. 3 is a schematic structural diagram of the present invention in Embodiment 2. FIG.

Reference signs: 1-body; 2-explosion-proof lining; 3-slag line part; 4-air blowing nozzle; 5-groove; 6-through hole; 7-annular air cavity; 8-annular groove; 9 -Iron shell; 10-Bowl structure; 11-Breathable mesh; 12-Center hole.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Disconnect the connection, or connect it in one piece. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations. In the foregoing description of the embodiments, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more of the embodiments or examples.

Example 1

As shown in Figure 1, the double-blowing argon long nozzle includes a main body 1, a slag line part 3, and an anti-explosion lining 2; the height of the main body 1 is 800mm, and the height of the slag line part 3 is 300mm. The diameter of the body 1 is 95mm, the diameter of the body 1 after the reduction is 145mm, and the diameter of the body 1 before the change is 215mm; the anti-explosion lining 2 is arranged on the inner wall of the body 1 and the slag line part 3 to form a central hole 12, specifically It is set at the lower end of the bowl structure 10, and the anti-explosion lining 2 is mainly made of non-carbon materials. The diameter of the center hole 12 increases linearly from top to bottom along the axial direction of the center hole 12 , the center hole 12 is narrow at the top and wide at the bottom, the minimum diameter of the upper end is 78mm, and the maximum diameter of the lower end is 85mm. After the molten steel flows out of the bowl structure 10, the flow velocity can be slowed down, and the scouring of the slag line can be reduced. The outer layer of the upper end of the main body 1 is provided with an iron shell 9, and the height of the iron shell 9 is 215mm; the upper end of the iron shell 9 is fixed on the top of the double-blowing argon long nozzle, and the bottom end of the iron shell 9 is fixed at a distance of 30mm from the bottom end of the reducing part , that is, after the iron shell 9 covers the reducing part, then extend the height of 30mm downward to cover the main body, because the double-blowing argon long nozzle rotates back and forth with the lower end of the reducing part as the rotating shaft during use, so the extra 30mm iron shell can Effectively protect the body and prolong the service life of the body. The upper end of the main body 1 is a bowl structure 10, the diameter of the bowl mouth of the bowl structure 10 is 136mm, the diameter of the bowl bottom is 123mm, and the height of the bowl structure 10 is 55mm; the right angle transition between the bowl bottom and the inner wall of the bowl structure 10 forms a The ladle connection table is used for connecting the long nozzle and the ladle, that is, the shape of the tap hole of the ladle is adapted to the shape of the connection table.

One side of the bowl structure 10 is provided with an air blowing nozzle 4; the length of the air blowing nozzle 4 is 35mm; , A ventilating net 11 is arranged between the blowing nozzle 4 and the annular air cavity 7; The bottom surface of the annular air cavity 7 is an inclined surface, which is used to increase the capacity of argon gas and buffer it.

As shown in FIG. 2 , the bowl mouth position of the bowl structure 10 is provided with 12 grooves 5. The grooves 5 are distributed at equal intervals along the circumference of the bowl mouth and are all connected to the annular air cavity 7; the width of the grooves 5 is 18- 22mm, the depth range is 1-3mm; the groove 5 passes through argon gas, forming a ring-shaped argon gas seal at the mouth of the bowl; isolates oxygen to form a complete air curtain. The argon flow rate in groove 5 is 5.5-6 L/min.

An annular groove 8 is arranged on the inner wall of the bowl structure 10, and the annular groove 8 is coaxial with the bowl structure 10; the annular groove 8 is connected with the annular air cavity 7 through the through hole 6; it forms a double seal with the groove to ensure that the ladle goes to the middle Nitrogen is not added when the ladle pours molten steel, thereby improving the purity of the molten steel. The argon gas flow rate in the through hole 6 is 2.5-3.5 L/min.

When in use, the double-blowing argon long nozzle is arranged between the ladle and the tundish, and the bowl structure 10 is used in conjunction with the lower nozzle of the ladle. 4. Blow in argon gas continuously, after passing through the breathable net 11, into the annular air cavity 7, the argon gas in the annular air cavity 7 first completely seals between the iron shell 9 and the body 1; The equidistant grooves 5 form a uniform air curtain, which effectively isolates oxygen; the argon gas in the annular groove 8 can further isolate the air by entering the annular groove 8 through the through hole 6 .

Example 2

As shown in FIG. 3 , the difference between Embodiment 2 and Embodiment 1 is that the ventilation mesh 11 is sleeved in the annular air cavity 7 , that is, the ventilation mesh 11 is an annular shape similar to the annular air cavity 7 .

In the foregoing description of the embodiments, the particular features, structures, materials or characteristics may be combined in any suitable manner in any one or more of the embodiments or examples.

The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art who is familiar with the technical scope disclosed by the present utility model can easily think of changes or replacements. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. The double-blowing argon long nozzle includes a main body, a slag line, an anti-explosion lining, and an iron shell. The anti-explosion lining is arranged on the inner wall of the main body and the slag line to form a central hole; the upper end of the main body is a bowl. The structure is characterized in that: the double-blowing argon long nozzle also includes: an air blowing nozzle, the air blowing nozzle is arranged on one side of the bowl structure; a groove, the groove is arranged at the bowl mouth position of the bowl structure; an annular groove, the annular groove is provided on the inner wall of the bowl structure, and the annular groove is coaxial with the bowl structure; An annular air cavity, the annular air cavity is arranged between the iron shell and the body, and the annular air cavity is used for connecting the groove, the through hole and the blowing nozzle. 2 . The double-blowing argon long nozzle according to claim 1 , wherein the upper part of the main body is provided with a reducing part. 3 . 3 . The double-blowing argon long nozzle according to claim 1 , wherein the annular groove is connected to the annular air cavity through a through hole. 4 . 4 . The double-blowing argon long nozzle according to claim 1 , wherein the grooves are distributed at equal intervals along the circumference of the bowl mouth. 5 . 5 . The double-blowing argon long nozzle according to claim 1 , wherein the groove has a width range of 18-22 mm and a depth range of 1-3 mm. 6 . 6 . The double-blowing argon long nozzle according to claim 1 , wherein a ventilation net is arranged between the air blowing nozzle and the annular air cavity. 7 . 7 . The double-blowing argon shroud according to claim 6 , wherein the breathable net is made of diffused breathable functional material or breathable annular seam. 8 . 8 . The long nozzle for double blowing argon according to claim 1 , wherein along the axial direction of the central hole, the diameter of the central hole increases linearly from top to bottom. 9 . 9 . The double-blowing argon long nozzle according to claim 1 , wherein the argon flow rate in the groove is 5.5-6L/min. 10 . 10 . The double-blowing argon long nozzle according to claim 1 , wherein the argon flow rate in the annular groove is 2.5-3.5 L/min. 11 .

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