C-shaped circular seam type casting powder nozzle for small square billet crystallizer

Abstract

The utility model belongs to the technical field of converter steelmaking, and particularly discloses a C-shaped circular seam type small square billet crystallizer casting powder sprayer which comprises a material slag connecting pipe and a C-shaped sprayer body, the C-shaped sprayer body comprises a bottom plate and an arch-shaped shell arranged on the bottom plate, a casting powder flowing channel is formed between the bottom plate and the arch-shaped shell, and the whole C-shaped sprayer body is in a C shape; a connecting piece is arranged at one end of the material slag connecting pipe, the other end of the material slag connecting pipe is communicated with the head portion of the C-shaped spray head, the tail portion of the C-shaped spray head is a blind end, a plurality of circular seams used for flowing out of casting powder are formed in the bottom plate, and the circular seams are tightly attached to the connecting position of the bottom plate and the arch-shaped shell. The crystallizer casting powder sprayer can ensure the uniformity of slag spraying, so that the height of the slag surface of casting powder in a crystallizer is kept consistent.

Description

TECHNICAL FIELD

[0001] The utility model belongs to converter steelmaking technical field, concretely relates to a C type ring slit formula small square billet crystallizer protecting slag spray head. BACKGROUND

[0002] At present, the crystallizer protecting slag addition of small square billet (rectangular billet) continuous casting production link has been gradually replaced by automatic slag adding machine instead of manual slag adding. The change of this production mode not only reduces the manual labor intensity, stabilizes the production rhythm, but also effectively reduces the production cost, and brings huge economic benefits to enterprises. However, the spray head of the automatic slag adding machine is mostly front duckbill type spray head or Y type spray head (such as Figure 1 、 2 ), this spray head can spray the protecting slag on the surface of the molten steel, but due to the fixed position and fixed powder spraying angle, it is easy to cause uneven powder spraying, the protecting slag surface in the crystallizer is high on one side and low on the other side, the height of the two sides is inconsistent, which causes waste and even production accidents.

[0003] Patent No. CN108941491A discloses a crystallizer automatic slag adding machine. The spray head of the invention is a double-spray-head mushroom distributor. The mushroom distributor device is complex, the motion trajectory is complex, and the protecting slag is easy to be sprayed on the outer wall of the submerged entry nozzle, which corrodes the refractory material.

[0004] Patent No. CN214392262U discloses a crystallizer protecting slag adding device. The spray head of the invention is a front duckbill type spray head. This spray head is fixed in position, the powder spraying angle is small, and it is easy to cause uneven powder spraying, which affects the application effect of the protecting slag.

[0005] Therefore, there is an urgent need for a crystallizer protecting slag spray head that can uniformly spray powder and is not easy to cause corrosion to the outer wall of the submerged entry nozzle. UTILITY MODEL CONTENTS

[0006] The utility model provides a C type ring slit formula small square billet crystallizer protecting slag spray head in view of the problems of uneven powder spraying of the existing crystallizer protecting slag, complex device structure and the like, the utility model discloses simple structure, convenient to install can effectively, evenly spray the crystallizer protecting slag on the surface of molten steel, insulate air and protect molten steel from secondary oxidation, stabilize production and save cost. Specifically, the utility model adopts the following technical means:

[0007] A C-shaped ring slit type small square billet crystallizer protective slag nozzle, comprising a slag connecting pipe and a C-shaped nozzle, the C-shaped nozzle comprising a bottom plate and an arched shell arranged on the bottom plate, a protective slag flow channel being formed between the bottom plate and the arched shell, and the C-shaped nozzle being in a C-shaped overall structure; one end of the slag connecting pipe is provided with a connecting piece, the other end of the slag connecting pipe is in communication with a head of the C-shaped nozzle, a tail of the C-shaped nozzle is a blind end, and a plurality of ring slits for the outflow of protective slag are arranged on the bottom plate and close to the connecting part of the bottom plate and the arched shell.

[0008] Further, the ring slits are arranged in sequence from the head of the C-shaped nozzle to the tail of the C-shaped nozzle.

[0009] Further, the ring slits comprise inner ring slits and outer ring slits, the inner ring slits are arranged along the inner side of the bottom plate, and the outer ring slits are arranged along the outer side of the bottom plate.

[0010] Further, the inner side wall of the inner ring slit is perpendicular to the horizontal plane, the outer side wall of the inner ring slit is arranged in an inclined manner, and the distance between the inner side wall and the outer side wall of the inner ring slit gradually increases from top to bottom.

[0011] Further, the angle between the plane where the inner side wall of the inner ring slit is located and the plane where the outer side wall of the inner ring slit is located is 30-40°.

[0012] Further, the angle between the plane where the inner side wall of the inner ring slit is located and the plane where the outer side wall of the inner ring slit is located is 35°.

[0013] Further, the inner side wall and the outer side wall of the outer ring slit are both arranged in an inclined manner, the inclined directions of the inner side wall and the outer side wall of the outer ring slit are opposite, and the distance between the inner side wall and the outer side wall of the outer ring slit gradually increases from top to bottom.

[0014] Further, the angle between the plane where the inner side wall of the outer ring slit is located and the plane where the outer side wall of the outer ring slit is located is 55-65°.

[0015] Further, the angle between the plane where the inner side wall of the outer ring slit is located and the plane where the outer side wall of the outer ring slit is located is 60°.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] The utility model discloses a C-shaped nozzle which is composed of a bottom plate and an arched shell arranged on the bottom plate, and a plurality of ring slits are arranged close to the connecting part of the bottom plate and the arched shell, so that the nozzle can be placed around the submerged nozzle during work, a circumferential area around the submerged nozzle can be formed when distributing the material, the protective slag is more uniformly distributed, and the slag surface height of the protective slag in the crystallizer is consistent.

[0018] The utility model discloses a structure that the inner ring slit is set to the inside wall and the outside wall are all inclined, the inside wall and the outside wall of the outer ring slit are opposite in the direction of inclination, the distance between the inside wall and the outside wall of the outer ring slit gradually increases from top to bottom, and the included angle between the plane where the inside wall of the outer ring slit is located and the plane where the outside wall is located is 55-65 degrees.

[0019] The utility model discloses a structure that the inner ring slit is set to the inside wall and the outside wall are all inclined, the inside wall and the outside wall of the outer ring slit are opposite in the direction of inclination, the distance between the inside wall and the outside wall of the outer ring slit gradually increases from top to bottom, and the included angle between the plane where the inside wall of the outer ring slit is located and the plane where the outside wall is located is 55-65 degrees. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall structure schematic diagram of C type ring slit type small square billet crystallizer protective slag nozzle of example 1;

[0021] Figure 2 It is Figure 1 longitudinal section;

[0022] Figure 3 It is the section view of C type nozzle of example 1 along the perpendicular to the protective slag flow direction;

[0023] Wherein, 1-material slag connecting pipe, 2-C type nozzle, 3-bottom plate, 4-arch shell, 5-protective slag flow channel, 6-connector, 7-inner ring slit, 8-outer ring slit, 9-protective slag conveying pipeline. DETAILED DESCRIPTION

[0024] The technical scheme in the utility model embodiment will be described clearly and completely in conjunction with the drawings.

[0025] For the requirement space relation's elaboration, can define " before and after " " left and right " " up and down (or vertical) " three orthogonal directions, pass through relative position relation definition space rectangular coordinate system.

[0026] As Figures 1 to 3 The utility model discloses a C type ring slit type small square billet crystallizer protective slag nozzle, including material slag connecting pipe 1 and C type nozzle 2, the C type nozzle 2 includes bottom plate 3 and sets up on the arch shell 4 of bottom plate 3, the bottom plate 3 and arch shell 4 between form protective slag flow channel 5, Figure 2 The arrow direction in the protective slag flow channel 5 is the flow direction of protective slag, and the C type nozzle 2 is in C type as a whole.

[0027] The slag connecting pipe 1 is provided with a connecting piece 6 at one end, which is used for connecting with a protective slag conveying pipe 9, for example, threaded connection, and the other end of the slag connecting pipe 1 is communicated with the head of the C-shaped nozzle 2, and the tail of the C-shaped nozzle 2 is a blind end.

[0028] The bottom plate 3 is provided with a plurality of annular slits for the outflow of the protective slag, a plurality of the annular slits are arranged at the connecting part of the bottom plate 3 and the arched shell 4, and the annular slits are sequentially arranged from the head of the C-shaped nozzle 2 to the tail of the C-shaped nozzle 2. In the embodiment, the annular slits include inner annular slits 7 and outer annular slits 8, the inner annular slits 7 are arranged along the inner side of the bottom plate 3, and the outer annular slits 8 are arranged along the outer side of the bottom plate 3.

[0029] The inner side wall of the inner annular slit 7 is perpendicular to the horizontal plane, the outer side wall of the inner annular slit 7 is arranged in an inclined manner, and the distance between the inner side wall and the outer side wall of the inner annular slit 7 gradually increases from top to bottom. Preferably, the included angle (as shown in the middle angle β) between the plane where the inner side wall of the inner annular slit 7 is located and the plane where the outer side wall is located is 30-40°. Further preferably, the included angle between the plane where the inner side wall of the inner annular slit 7 is located and the plane where the outer side wall is located is 35°. The inner side wall of the inner annular slit 7 is perpendicular to the horizontal plane, which aims to prevent the protective slag from being directly sprayed on the surface of the mold submerged entry nozzle, so as to avoid corrosion of the nozzle. The flow direction of the protective slag sprayed from the inner annular slit 7 is shown by the arrow below the inner annular slit 7. Figure 3 Figure 3 The inner side wall and the outer side wall of the outer annular slit 8 are both arranged in an inclined manner, and the inclined directions of the inner side wall and the outer side wall of the outer annular slit 8 are opposite, and the distance between the inner side wall and the outer side wall of the outer annular slit 8 gradually increases from top to bottom. Preferably, the included angle (as shown in the middle angle α) between the plane where the inner side wall of the outer annular slit 8 is located and the plane where the outer side wall is located is 55-65°. Further preferably, the included angle between the plane where the inner side wall of the outer annular slit 8 is located and the plane where the outer side wall is located is 60°. The inner side wall and the outer side wall of the outer annular slit 8 are arranged in an inclined manner, which aims to ensure that the protective slag can be sprayed to the corner of the mold when the slag is sprayed, so as to ensure the uniformity of the slag spraying.

[0030] The inner side of the bottom plate 3 refers to one end of the bottom plate 3 close to the inner side of the C-shaped nozzle 2, the outer side of the bottom plate 3 refers to one end of the bottom plate 3 close to the outer side of the C-shaped nozzle 2; the inner side wall of the inner annular slit 7 refers to the wall surface of the inner annular slit 7 close to the inner side of the C-shaped nozzle 2, the outer side wall of the inner annular slit 7 refers to the wall surface of the inner annular slit 7 close to the outer side of the C-shaped nozzle 2; the inner side wall of the outer annular slit 8 refers to the wall surface of the outer annular slit 8 close to the inner side of the C-shaped nozzle 2, and the outer side wall of the outer annular slit 8 refers to the wall surface of the outer annular slit 8 close to the outer side of the C-shaped nozzle 2. Figure 3

[0031]

[0032] ​​​The using process of the C-shaped ring slit type small square billet crystallizer protective slag nozzle is as follows:

[0033] Preparation before spraying slag: observe whether the ring slit of the C-shaped nozzle 2 is blocked, and if blocked, cleaning is needed. Connect the protective slag conveying pipeline 9, fix the C-shaped nozzle 2 on the continuous casting crystallizer platform, and make the crystallizer submerged nozzle pass through the middle of the C-shaped nozzle for molten steel pouring, and the submerged nozzle and the C-shaped nozzle 2 are required to be strictly centered.

[0034] Spraying slag: the crystallizer protective slag is sent into the C-shaped nozzle 2 through the protective slag conveying pipeline 9 with nitrogen as the carrier gas, and the protective slag is uniformly sprayed on the surface of the molten steel from the ring slit with nitrogen. It is noted that the flow of the protective slag carrier gas is increased at the initial pouring stage, and the amount of the protective slag is increased to ensure the heat preservation and lubrication effect of the protective slag; the flow of the protective slag carrier gas is appropriately reduced at the stable pouring stage to achieve stable production. The protective slag sprayed from the inner ring slit 7 can avoid the surface of the crystallizer submerged nozzle, and the protective slag sprayed from the outer ring slit 8 can cover the corner of the crystallizer.

Claims

1. A C-ring slit type billet mold powder nozzle characterized by: The C-shaped nozzle (2) comprises a bottom plate (3) and an arched shell (4) arranged on the bottom plate (3), a protection slag flow channel (5) is formed between the bottom plate (3) and the arched shell (4), and the C-shaped nozzle (2) is in a C shape as a whole. The C-shaped nozzle (2) comprises a bottom plate (3) and an arched shell (4) arranged on the bottom plate (3), a protection slag flow channel (5) is formed between the bottom plate (3) and the arched shell (4), and the C-shaped nozzle (2) is in a C shape as a whole. One end of the slag connecting pipe (1) is provided with a connecting piece (6), the other end of the slag connecting pipe (1) is in communication with the head of the C-shaped nozzle (2), and the tail of the C-shaped nozzle (2) is a blind end. A plurality of annular slits for the outflow of the protection slag are arranged on the bottom plate (3), and the plurality of annular slits are arranged close to the connecting part of the bottom plate (3) and the arched shell (4).

2. The shroud of claim 1, wherein: The annular slits are arranged in sequence from the head of the C-shaped nozzle (2) to the tail of the C-shaped nozzle (2).

3. The shroud of claim 1, wherein: The annular slits comprise inner annular slits (7) and outer annular slits (8), the inner annular slits (7) are arranged along the inner side of the bottom plate (3), and the outer annular slits (8) are arranged along the outer side of the bottom plate (3).

4. The protective slag nozzle of claim 3, wherein: The inner side wall of the inner annular slit (7) is perpendicular to the horizontal plane, the outer side wall of the inner annular slit (7) is arranged in an inclined manner, and the distance between the inner side wall and the outer side wall of the inner annular slit (7) gradually increases from top to bottom.

5. The protective slag nozzle of claim 4, wherein: The angle between the plane where the inner side wall of the inner annular slit (7) is located and the plane where the outer side wall is located is 30-40°.

6. The shroud of claim 4, wherein: The angle between the plane where the inner side wall of the inner annular slit (7) is located and the plane where the outer side wall is located is 35°.

7. The shroud according to claim 3 or 4, characterized in that: The inner side wall and the outer side wall of the outer annular slit (8) are arranged in an inclined manner, the inclined directions of the inner side wall and the outer side wall of the outer annular slit (8) are opposite, and the distance between the inner side wall and the outer side wall of the outer annular slit (8) gradually increases from top to bottom.

8. The protective slag nozzle of claim 7, wherein: The angle between the plane where the inner side wall of the outer annular slit (8) is located and the plane where the outer side wall is located is 55-65°.

9. The protective slag nozzle of claim 7, wherein: The angle between the plane where the inner side wall of the outer annular slit (8) is located and the plane where the outer side wall is located is 60°.

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