A totally enclosed argon protection device

Abstract

The application discloses a fully-closed argon protection device, and relates to the technical field of mold casting pouring, which comprises a ladle nozzle, a funnel brick and a middle injection pipe, and further comprises an upper argon ring, a lower argon ring and a cover body arranged between the upper argon ring and the lower argon ring; an upper argon outlet and an upper argon inlet are formed in the upper argon ring, the upper argon outlet is arranged on the inner side of the upper argon ring, and the opening is arranged to be inclined upward; a lower argon outlet and a lower argon inlet are formed in the lower argon ring. The upper argon outlet blows upward, at this time, the upper argon flow drives the air around the upper argon ring to flow outward, so that the air in the cover body is discharged, and at the same time, when the lower argon outlet blows gas toward the middle injection pipe, the argon contacts the middle injection pipe and then diffuses, part of the argon diffuses into the cover body, and with the continuous outward flow of the air around the upper argon ring, the diffused argon blown by the lower argon ring continuously fills the whole cover body, so that the oxygen content in the cover body is reduced.

Description

Technical Field

[0001] This invention relates to the field of mold casting technology, specifically to a fully enclosed argon gas protection device. Background Technology

[0002] With the development of industrialization, the demand for die-cast and forged steel parts in various fields is increasing, including the master electrode of high-end vacuum consumable steel ingots, which also rely on modern die-casting. In today's aerospace, nuclear power, and wind power industries, where the purity requirements for die-cast products are increasingly stringent, ensuring the purity of steel ingots is particularly important. The smelting process achieves control over low oxygen content, low hydrogen (nitrogen) content, and low inclusion content. However, if measures to prevent secondary oxidation are not properly implemented in the die-casting process, all the work done in smelting will be wasted. Therefore, achieving a fully enclosed casting process to completely eliminate secondary oxidation of molten steel is imperative.

[0003] For example, the invention patent with publication number CN2579558Y, entitled "Fully Enclosed Argon-Protected Casting Device for Molten Steel," includes a refractory sleeve with a convex cavity. The sleeve's outer head protrudes, the middle is recessed into an inverted cone, and the bottom is sloped. The inner cavity of the sleeve is an inverted cone, with the lower inner diameter roughly equivalent to the size of the molten steel. A circular metal bracket supporting the sleeve is fixed to the end of a movable (or rotatable) metal support. Two sets of annular gas outlets connected to argon gas pipes spray downwards, one set in the upper part of the sleeve's inner cavity and the other set inside the metal bracket. A circular protective ring, with an outer metal layer and an inner refractory fiber layer, is placed at the upper opening of the intermediate injection pipe. During operation, the metal support is moved so that the sleeve aligns with the protective ring at the ladle nozzle and the upper opening of the intermediate injection pipe. The argon gas switch is then turned on, forming an argon protective layer around the molten steel and the sleeve. This invention is rationally designed, simple in structure, and highly operable, achieving fully enclosed protected casting, reducing the N and O content of the steel ingot, and meeting the high-quality requirements of users.

[0004] When using argon protection, as described in patent CN2579558Y, argon gas is sprayed to create a protective atmosphere between the protective cover and the ladle nozzle or funnel brick and the intermediate injection pipe to isolate air. However, in the initial stage of pouring, there is still residual oxygen inside the protective cover and between the intermediate injection pipe. When pouring at this time, the first batch of molten steel is prone to oxidation, which will affect the quality of the product. Therefore, oxygen extraction is often required before pouring. However, oxygen extraction needs to be carried out independently and requires a separate oxygen extraction device, which makes the preliminary preparation cumbersome. Summary of the Invention

[0005] The purpose of this invention is to provide a fully enclosed argon gas protection device to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fully enclosed argon gas protection device, comprising a ladle nozzle, a funnel brick, and a central injection pipe, further comprising: an upper argon gas ring, a lower argon gas ring, and a cover installed between the upper and lower argon gas rings; the upper argon gas ring has an upper argon gas outlet and an upper argon gas inlet, the upper argon gas outlet being located inside the upper argon gas ring and having its opening facing obliquely upward; the lower argon gas ring has a lower argon gas outlet and a lower argon gas inlet, the lower argon gas outlet being located below the lower argon gas ring and having its opening facing downward.

[0007] Preferably, the refractory fiber is also included, which is disposed between the middle injection pipe and the lower argon ring.

[0008] Preferably, a medium argon ring is fixedly installed on the cover, and the medium argon ring has a medium argon inlet, a medium argon outlet A, and a medium argon outlet B.

[0009] The cover is provided with a first vent and a second vent. The first vent is connected to the middle argon outlet A and the upper argon inlet, and the second vent is connected to the middle argon outlet B and the lower argon inlet.

[0010] Preferably, the cover is provided with a first folded end and a second folded end.

[0011] Preferably, both the first and second bend ends are set at right angles.

[0012] Preferably, both the first and second bend ends are acute angles.

[0013] Preferably, the distance between the first bend end and the ladle nozzle is smaller than the distance between the first bend end and the funnel brick.

[0014] Preferably, the cover forms a heat storage zone at the second corner end.

[0015] Preferably, a bracket is fixedly installed on the outer surface of the cover.

[0016] In the above technical solution, the present invention provides a fully enclosed argon gas protection device, which has the following beneficial effects: when pouring is required, the cover moves to the middle injection pipe along with the ladle nozzle. At this time, the lower argon ring is squeezed on the refractory fiber. Then, argon gas is filled into the upper and lower argon rings. At this time, several upper argon gas outlets will blow argon gas towards the oblique upper part of the ladle nozzle. At this time, a protective gas flow layer will be formed between the upper argon ring and the ladle nozzle, thereby preventing air from entering the cover.

[0017] At the same time, the lower argon ring also blows air towards the middle injection tube through the lower argon outlet. At this time, a protective airflow layer will also be formed between the lower argon ring and the middle injection tube, thereby preventing air from entering the enclosure.

[0018] Furthermore, since the upper argon outlet blows upwards at an angle, the upward argon flow will cause the air around the upper argon ring to flow outwards, thereby expelling the air inside the enclosure. At the same time, when the lower argon outlet blows air towards the middle injection pipe, the argon will dissipate after contacting the middle injection pipe, and some of the argon will dissipate into the enclosure. Meanwhile, as the air around the upper argon ring continues to flow outwards, the dissipated argon blown out by the lower argon ring will continuously fill the entire enclosure, thereby reducing the oxygen content inside the enclosure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the right-angled structure at the first bend of the cover body provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the acute angle at the first bend of the cover provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the bracket provided in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Ladle nozzle; 2. Funnel brick; 30. Upper argon ring; 31. Upper argon outlet; 32. Upper argon inlet; 40. Cover; 41. First vent; 42. Second vent; 43. First bend end; 44. Second bend end; 45. Storage area; 50. Middle argon ring; 51. Middle argon inlet; 52. Middle argon outlet A; 53. Middle argon outlet B; 60. Lower argon ring; 61. Lower argon inlet; 62. Lower argon outlet; 7. Refractory fiber; 8. Bracket; 9. Middle injection pipe. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] Please see Figure 1-3 A fully enclosed argon gas protection device includes a ladle nozzle 1, a funnel brick 2, and a central injection pipe 9, and further includes:

[0027] Upper argon ring 30, lower argon ring 60, and cover 40 installed between upper argon ring 30 and lower argon ring 60;

[0028] The upper argon ring 30 is provided with an upper argon outlet 31 and an upper argon inlet 32. The upper argon outlet 31 is located on the inner side of the upper argon ring 30 and the opening is set to face obliquely upward.

[0029] The lower argon ring 60 is provided with a lower argon outlet 62 and a lower argon inlet 61. The lower argon outlet 62 is located below the lower argon ring 60 and its opening faces downward.

[0030] When pouring is required, the cover 40 moves to the middle pouring pipe 9 along with the ladle nozzle 1. At this time, the lower argon ring 60 is squeezed onto the refractory fiber 7. Then, argon is filled into the upper argon ring 30 and the lower argon ring 60. At this time, several upper argon outlets 31 will blow argon towards the oblique upper part of the ladle nozzle 1. At this time, a protective airflow layer will be formed between the upper argon ring 30 and the ladle nozzle 1, thereby preventing air from entering the cover 40.

[0031] At the same time, the lower argon ring 60 also blows air towards the middle injection pipe 9 through the lower argon outlet 62. At this time, the lower argon ring 60 will also form a protective airflow layer between the middle injection pipe 9, thereby preventing air from entering the cover 40.

[0032] Furthermore, since the upper argon outlet 31 blows upwards at an angle, the upward argon flow will cause the air around the upper argon ring 30 to flow outwards, thereby expelling the air inside the enclosure 40. At the same time, when the lower argon outlet 62 blows air towards the middle injection pipe 9, the argon will dissipate after contacting the middle injection pipe 9, and some of the argon will dissipate into the enclosure 40. Meanwhile, as the air around the upper argon ring 30 continues to flow outwards, the dissipated argon blown out by the lower argon ring 60 will continuously fill the entire enclosure 40, thereby reducing the oxygen content inside the enclosure 40. At this time, no additional oxygen extraction device is needed, so that the oxygen inside the enclosure 40 can be removed while performing argon protection.

[0033] The upper argon outlet 31 and upper argon inlet 32, as well as the lower argon outlet 62 and lower argon inlet 61, are each provided in several units, and are respectively arranged in a circular array on the upper argon ring 30 and the lower argon ring 60.

[0034] In another embodiment of the present invention: it further includes refractory fiber 7, which is disposed between the middle injection pipe 9 and the lower argon ring 60;

[0035] During the pouring process, the cover 40 will cause the lower argon ring 60 to press on the refractory fiber 7. Since the refractory fiber 7 is soft and has a certain thickness, the lower argon ring 60 pressing on it will play a buffering role and also play a certain sealing role.

[0036] Furthermore, the refractory fiber 7 has a porous structure inside. When the bottom end of the argon ring 60 is pressed against the refractory fiber 7, as the argon gas is blown out from the lower argon outlet 62, the argon gas will enter the porous structure and continuously dissipate. The refractory fiber 7 acts as a buffer to prevent the high-speed argon gas from creating tiny gaps and allowing air to enter when it impacts the middle injection tube 9. It also prevents dust, powder and other impurities on the middle injection tube 9 from splashing and entering the cover 40 when the high-speed argon gas impacts the middle injection tube 9, which would result in defective products.

[0037] In another embodiment of the present invention: a medium argon ring 50 is fixedly installed on the cover 40, and the medium argon ring 50 is provided with a medium argon inlet 51, a medium argon outlet A52 and a medium argon outlet B53.

[0038] The cover 40 is provided with a first vent 41 and a second vent 42. The first vent 41 is connected to the middle argon outlet A52 and the upper argon inlet 32, and the second vent 42 is connected to the middle argon outlet B53 and the lower argon inlet 61.

[0039] Argon gas can be introduced into the middle argon ring 50 through the middle argon inlet 51. The argon gas then enters the upper argon ring 30 through the middle argon outlet A52, the first vent 41 and the upper argon inlet 32, and enters the lower argon ring 60 through the middle argon outlet B53, the second vent 42 and the lower argon inlet 61.

[0040] In most existing argon gas protective covers, the argon gas injection method typically involves directly introducing argon gas into the cover body 40, thus filling the inside of the cover body 40 with argon gas. However, argon gas is usually stored and transported in liquid form at temperatures below -185.7°C. When in use, it is converted into gas by a vaporizer, and can be used directly once the temperature rises above 0°C. However, directly introducing argon gas at 0°C into the cover body 40 will cause it to come into direct contact with the poured molten steel, resulting in a drop in the temperature of the exposed solution, leading to nodule formation or partial condensation, which affects the quality of subsequent products. In this application, argon gas enters the intermediate argon ring 50 through the intermediate argon gas inlet 51. At this time, the argon gas fills the intermediate argon ring 50 and is transported to the upper argon ring 30 and lower argon ring 30 within the cover body 40 through the first vent 41 and the second vent 42. In the gas ring 60, the argon gas will not directly contact the solution inside the cover 40. However, due to the high temperature generated during the pouring of the solution, the temperature of the cover 40 itself will also rise. Some existing protective covers have been damaged due to prolonged use at high temperatures. However, in this application, when the argon gas enters the upper argon ring 30 and the lower argon ring 60 through several first vent holes 41 and second vent holes 42, the low temperature of the argon gas itself will cool the cover 40, thereby extending the service life of the cover 40. At the same time, when the argon gas flows inside the cover 40, it absorbs the heat of the cover 40 to preheat itself. When the argon gas comes out from the lower argon gas outlet 62 and enters the inside of the cover 40, its temperature has already risen. At this time, contact with the solution will not cool it down, thus avoiding any impact on subsequent products.

[0041] In another embodiment of the present invention: the cover 40 is provided with a first folded end 43 and a second folded end 44;

[0042] The first bend end 43 and the second bend end 44 are designed to make the cover body 40 narrower at the top and wider at the bottom, so as to accommodate the size of the ladle nozzle 1 and the funnel brick 2.

[0043] In another embodiment of the present invention: both the first bend end 43 and the second bend end 44 are set at right angles;

[0044] The right angle is used to make the cross section of the cover 40 convex. When the cover 40 is convex, when the upper argon outlet 31 blows argon outward, the narrower upper part of the cover 40 and the ladle nozzle 1 form an outflow channel. When the argon blows outward, it will also drive the air in the outflow channel to flow outward. At this time, the first bend end 43 and the second bend end 44 are set at right angles to facilitate the rapid movement of the air stored between the wider lower part of the cover 40 and the funnel brick 2.

[0045] In another embodiment of the present invention: both the first bend end 43 and the second bend end 44 are set at acute angles;

[0046] Among them, reference Figure 2 When the first bend end 43 and the second bend end 44 are set to an acute angle, the cross section of the cover 40 is "N" shaped. At the same time, the bottom end of the first bend end 43 of the cover 40 is flush with the top of the funnel brick 2 or extends into the funnel brick 2. When the upper argon outlet 31 blows up, as it drives the surrounding air to flow outward, the part of the cover 40 that extends into the funnel brick 2 causes the inner surface of the cover 40 to intersect with the funnel brick 2. At this time, the suction force generated by the outward airflow will simultaneously cause the air in the funnel brick 2, the middle injection pipe 9 and the casting mold to be discharged from the top of the cover 40.

[0047] Typically, in the early stages of casting, workers will introduce argon gas through the riser or through-hole of the mold to reduce the oxygen content inside the mold. At this time, the argon gas isolation layer on the upper part of the cover 40 can accelerate the discharge of air from the mold, the middle injection pipe 9, and the funnel brick 2.

[0048] In another embodiment of the present invention: the distance between the first angled end 43 and the ladle nozzle 1 is smaller than the distance between the first angled end 43 and the funnel brick 2;

[0049] As argon gas is blown out from the upper argon outlet 31, the surrounding air follows and is discharged outward. At this time, the distance between the first bend end 43 and the ladle nozzle 1 decreases. The air flow rate is fast and the pressure is low, thus generating a certain self-suction force. At this time, the air in the surrounding area, including the air between the first bend end 43 and the funnel brick 2, will move towards the low-pressure area due to the high pressure. This will accelerate the discharge of air between the lower half of the cover 40 and the funnel brick 2, and also make it easier to discharge the air in the funnel brick 2 and the middle injection pipe 9.

[0050] In another embodiment of the present invention: the cover 40 forms a heat storage area 45 at the second corner end 44;

[0051] As the air inside the casing 40 is expelled, the pouring of molten steel begins. At this time, the high-temperature molten steel enters the funnel brick 2 through the ladle nozzle 1. Because the ladle nozzle 1 extends into the funnel brick 2, the exposed path of the molten steel is reduced, minimizing temperature drop and preventing condensation of cold steel at the lower end of the nozzle and inside the funnel brick 2. Simultaneously, the hot air generated by the high-temperature molten steel will rise and be split into two flows through the first bend end 43. (Refer to...) Figure 2 The first flow direction is upward on the right side of the first bend end 43, and flows out through the channel between the upper argon ring 30 and the ladle nozzle 1. At this time, two isolation protection measures will be formed between the upper argon ring 30 and the ladle nozzle 1. The first is the argon isolation layer generated when the argon gas is ejected at high speed obliquely upward. The second is the high temperature hot gas layer. Since a large amount of hot gas is always surging upward, it prevents the air from moving downward through the channel between the upper argon ring 30 and the ladle nozzle 1.

[0052] Meanwhile, the second flow of hot gas flows upward from the left side of the first bend end 43. At this time, the hot gas enters the storage area 45, and the argon ring 50 is set at the second bend end 44. The argon ring 50 will be heated in the storage area 45, thereby preheating the argon gas introduced into it. The preheated argon gas enters the first vent 41 and the second vent 42 and will be further heated. At the same time, it absorbs heat and cools the cover 40, extending the service life of the cover 40.

[0053] In another embodiment of the present invention: a bracket 8 is fixedly installed on the outer surface of the cover 40;

[0054] The cover 40 and the ladle nozzle 1 are fixedly connected by the bracket 8 so that the cover 40 moves with the ladle nozzle 1. Alternatively, the bracket 8 can be connected to other drive mechanisms. When in use, the cover 40 is first moved onto the funnel brick 2, and then the ladle nozzle 1 is moved into the cover 40.

[0055] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fully enclosed argon gas protection device, comprising a ladle nozzle (1), a funnel brick (2), and a central injection pipe (9), characterized in that, Also includes: Upper argon ring (30), lower argon ring (60) and cover (40) installed between the upper argon ring (30) and the lower argon ring (60); The upper argon ring (30) is provided with an upper argon outlet (31) and an upper argon inlet (32). The upper argon outlet (31) is located on the inner side of the upper argon ring (30) and its opening faces obliquely upward. The lower argon ring (60) is provided with a lower argon outlet (62) and a lower argon inlet (61). The lower argon outlet (62) is located below the lower argon ring (60) and its opening faces downward. The cover (40) is provided with a first corner end (43) and a second corner end (44). Both the first bend end (43) and the second bend end (44) are set at acute angles.

2. The fully enclosed argon gas protection device according to claim 1, characterized in that, It also includes refractory fiber (7), which is disposed between the middle injection pipe (9) and the lower argon ring (60).

3. The fully enclosed argon gas protection device according to claim 1, characterized in that, A medium argon ring (50) is fixedly installed on the cover (40). The medium argon ring (50) has a medium argon inlet (51), a medium argon outlet A (52), and a medium argon outlet B (53). The cover (40) is provided with a first vent (41) and a second vent (42), and the first vent (41) is connected to the middle argon outlet A (52) and the upper argon inlet (32), and the second vent (42) is connected to the middle argon outlet B (53) and the lower argon inlet (61).

4. The fully enclosed argon gas protection device according to claim 1, characterized in that, The distance between the first bend end (43) and the ladle nozzle (1) is smaller than the distance between the first bend end (43) and the funnel brick (2).

5. A fully enclosed argon gas protection device according to claim 1, characterized in that, The cover (40) forms a heat storage area (45) at the second corner end (44).

6. The fully enclosed argon gas protection device according to claim 1, characterized in that, A bracket (8) is fixedly installed on the outer surface of the cover (40).

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