Totally-closed argon protection device

Abstract

The invention discloses a totally-closed argon protection device, which relates to the technical field of die casting pouring, and comprises a steel ladle nozzle, a funnel brick, a central casting pipe, 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 gas outlet and an upper argon gas inlet are formed in the upper argon gas ring, the upper argon gas outlet is formed in the inner side of the upper argon gas ring, and an opening of the upper argon gas outlet faces the inclined upper portion; and the lower argon ring is provided with a lower argon outlet and a lower argon inlet. The upper argon outlet blows upwards obliquely, upper argon flow drives air around the upper argon ring to flow outwards at the moment, so that air in the cover body is exhausted, meanwhile, when the lower argon outlet blows towards the middle injection pipe, argon is in contact with the middle injection pipe and then escapes, and part of argon escapes towards the inside of the cover body. Meanwhile, along with continuous outward flow of air around the upper argon gas ring, the whole cover body is continuously filled with escaping argon gas blown out by the lower argon gas ring, so that the oxygen content in the cover body is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mold casting and pouring, and in particular to a fully enclosed argon protection device. Background Art

[0002] With the development of industrialization, the demand for die-cast forged steel parts in various fields is increasing. This includes the mother electrodes of high-end vacuum consumable steel ingots, which are also inseparable from modern die-casting casting. In today's aviation, aerospace, nuclear power, wind power and other fields, where the purity of die-cast products is increasingly required, how to ensure the purity of steel ingots is particularly important. The smelting process has achieved the control of low oxygen content, low hydrogen (nitrogen) content, and low inclusion content. However, if the pouring process of die-casting fails to take measures to prevent secondary oxidation, all the previous work of smelting will be wasted. Therefore, it is imperative to achieve a fully enclosed pouring process and completely prevent the secondary oxidation of molten steel.

[0003] For example, the invention patent with publication number CN2579558Y and name “Fully Enclosed Argon Protection Pouring Device for Liquid Steel Mold Casting” includes a refractory sleeve with a convex cavity, with a protruding outer head, an indented middle part in the shape of an inverted cone, and an inclined bottom; the inner cavity of the sleeve is an inverted cone, and the inner diameter of the lower mouth is comparable to the size of the steel flow; the annular metal bracket supporting the sleeve is fixed to the end of a movable (or rotating) metal bracket; two groups of annular air outlets connected to the argon pipeline spray downward, one group is at the upper part of the inner cavity of the sleeve, and the other group is inside the metal bracket; a circular protective ring with a metal outer layer and a refractory fiber inner layer is placed on the upper end of the center injection pipe. During operation, the metal bracket is moved to align the sleeve with the protective rings at the ladle water inlet and the upper end of the center injection pipe, and the argon switch is turned on to form an argon protective layer around the steel flow and the sleeve. The present invention has a reasonable design, simple structure, and strong operability, and realizes fully enclosed protective pouring, reduces the N and O content of the steel ingot, and meets the high quality requirements of users;

[0004] When argon protection is performed, as in the patent with publication number CN2579558Y, a protective atmosphere is formed between the protective cover and the ladle water outlet or the funnel brick and the center pouring pipe by spraying argon to isolate the air. However, in the initial stage of pouring, there is still residual oxygen inside the protective cover and between the center pouring pipe. At this time, when pouring, the first batch of molten steel that falls is easily oxidized, thereby affecting the quality of the product. Therefore, oxygen extraction is often required before pouring, but the oxygen extraction needs to be carried out independently, and an independent oxygen extraction device must be operated, which makes the preliminary preparations cumbersome. Summary of the Invention

[0005] The object of the present invention is to provide a fully enclosed argon protection device to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fully enclosed argon protection device, comprising a ladle nozzle, a funnel brick and a center injection pipe, and also comprising: an upper argon ring, a lower argon ring and a cover body installed between the upper argon ring and the lower argon ring; the upper argon ring is provided with an upper argon outlet and an upper argon inlet, the upper argon outlet is arranged on the inner side of the upper argon ring, and the opening is arranged obliquely upward; the lower argon ring is provided with a lower argon outlet and a lower argon inlet, the lower argon outlet is arranged below the lower argon ring, and the opening is arranged downward.

[0007] Preferably, refractory fibers are further included, and the refractory fibers are arranged between the middle injection tube and the lower argon ring.

[0008] Preferably, a medium argon gas ring is fixedly mounted on the cover body, and the medium argon gas ring is provided with a medium argon gas inlet and a medium argon gas outlet A and a medium argon gas outlet B;

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

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

[0011] Preferably, the first angled end and the second angled end are both arranged at right angles.

[0012] Preferably, the first angled end and the second angled end are both set at acute angles.

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

[0014] Preferably, the cover forms a heat storage area at the second folded end.

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

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

[0017] At the same time, the lower argon ring also blows toward the middle injection tube through the lower argon outlet. At this time, a protective airflow layer is formed between the lower argon ring and the middle injection tube, thereby isolating air from entering the cover body.

[0018] And because the upper argon outlet blows upward at an angle, the upper argon flow will drive the air around the upper argon ring to flow outward, thereby expelling the air in the cover. At the same time, when the lower argon outlet blows toward the middle injection tube, the argon will escape after contacting the middle injection tube, and part of the argon will escape into the cover. At the same time, as the air around the upper argon ring continues to flow outward, the escaped argon blown out by the lower argon ring will continue to fill the entire cover, thereby reducing the oxygen content in the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic structural diagram of a right angle at the first folded corner end of the cover body provided by an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of the acute angle of the first folded end of the cover body provided by an embodiment of the present invention;

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

[0023] Description of reference numerals:

[0024] 1. Ladle nozzle; 2. Funnel brick; 30. Upper argon ring; 31. Upper argon outlet; 32. Upper argon inlet; 40. Cover body; 41. First vent hole; 42. Second vent hole; 43. First angle end; 44. Second angle end; 45. Temperature 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 DESCRIPTION

[0025] In order 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] See also Figure 1-3 A fully enclosed argon protection device includes a ladle nozzle 1, a funnel brick 2 and a center injection pipe 9, and also includes:

[0027] An upper argon ring 30, a lower argon ring 60, and a cover body 40 installed between the upper argon ring 30 and the 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 opens 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 provided below the lower argon ring 60 and opens downward.

[0030] When pouring is required, the cover body 40 moves with the ladle nozzle 1 to the middle pouring pipe 9. At this time, the lower argon ring 60 is squeezed on the refractory fiber 7, and then argon is filled into the upper argon ring 30 and the lower argon ring 60. At this time, the upper argon outlets 31 will blow argon toward the upper side of the inclined ladle nozzle 1. At this time, a protective air flow layer will be formed between the upper argon ring 30 and the ladle nozzle 1, thereby isolating air from entering the cover body 40.

[0031] At the same time, the lower argon ring 60 also blows air toward the middle injection pipe 9 through the lower argon outlet 62. At this time, a protective air flow layer is formed between the lower argon ring 60 and the middle injection pipe 9, thereby isolating air from entering the cover body 40.

[0032] And because the upper argon outlet 31 blows obliquely upward, the upper argon flow will drive the air around the upper argon ring 30 to flow outward, thereby discharging the air in the cover body 40. At the same time, when the lower argon outlet 62 blows toward the middle injection pipe 9, the argon will escape after contacting the middle injection pipe 9, and part of the argon will escape into the cover body 40. At the same time, as the air around the upper argon ring 30 continues to flow outward, the escaped argon blown out by the lower argon ring 60 will continue to fill the entire cover body 40, thereby reducing the oxygen content in the cover body 40. At this time, no additional oxygen extraction device is required, so that the oxygen in the cover body 40 can be eliminated while performing argon protection.

[0033] There are a plurality of upper argon outlets 31 and upper argon inlet 32 ​​as well as a plurality of lower argon outlets 62 and lower argon inlet 61 , which are arranged in a circular array on the upper argon ring 30 and the lower argon ring 60 .

[0034] Another embodiment of the present invention further includes a 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 drives 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 presses on it to play a buffering role and also plays a certain sealing role.

[0036] In addition, there is a porous structure inside the refractory fiber 7. After the bottom end of the lower argon ring 60 is squeezed on the refractory fiber 7, as the lower argon outlet 62 blows out argon, the argon at this time will enter the porous structure and continue to escape. The buffering escape through the refractory fiber 7 prevents the high-speed argon from generating tiny gaps and entering the air when hitting the injection pipe 9. At the same time, it also prevents the high-speed argon from causing dust, powder and other impurities on the injection pipe 9 to splash into the cover body 40 when hitting the injection pipe 9, resulting in defective cast products.

[0037] In another embodiment of the present invention, a medium argon ring 50 is fixedly mounted on the cover body 40 , and the medium argon ring 50 is provided with a medium argon inlet 51 , a medium argon outlet A 52 , and a medium argon outlet B 53 ;

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

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

[0040] In most existing argon protective covers, the argon injection method is usually to directly pass the argon into the cover body 40, so that the inside of the cover body 40 is filled with argon. However, argon is usually stored and transported in liquid form at a temperature below -185.7°C. When used, it is converted into gas through a vaporizer and can be used directly when the temperature rises above 0°C. However, when the argon at 0°C is directly passed into the cover body 40, it will come into direct contact with the poured steel solution, thereby causing the temperature of the exposed solution to drop, resulting in nodules or partial condensation, affecting the quality of subsequent products. In the present application, after the argon enters the middle argon ring 50 through the middle argon inlet 51, the argon is filled in the middle argon ring 50 and is transported to the upper argon ring 30 and the lower argon ring 30 in the body of the cover body 40 through the first vent hole 41 and the second vent hole 42. The argon gas at this time will not directly contact the solution inside the cover body 40, and the high temperature generated when pouring the solution will be stored in the cover body 40. At this time, the temperature of the cover body 40 itself will also rise. Some existing protective covers are damaged due to long-term high-temperature use. However, in this application, when the argon gas enters the upper argon ring 30 and the lower argon ring 60 through several first air holes 41 and the second air holes 42, the low temperature of the argon gas itself will cool the cover body 40 itself, thereby extending the service life of the cover body 40. At the same time, when the argon gas circulates in the cover body 40, it absorbs the heat of the cover body 40 and preheats itself. When the argon gas comes out from the lower argon outlet 62 and enters the inside of the cover body 40, its temperature has already risen. At this time, contact with the solution will not cool it down, thereby avoiding affecting subsequent products.

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

[0042] The first angled end 43 and the second angled end 44 are provided so that the cover body 40 has a shape that is narrow at the top and wide at the bottom, so as to be able to adapt to the size of the ladle nozzle 1 and the funnel brick 2 .

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

[0044] The right-angle setting makes the cross-section of the cover body 40 "convex". When the cover body 40 is in a "convex" shape, when the upper argon outlet 31 blows argon outward, an outflow channel is formed between the upper half of the cover body 40 with a narrower diameter and the ladle water nozzle 1. At this time, when the argon is blown outward, it will also drive the air in the outflow channel to flow outward. At this time, the first angled end 43 and the second angled end 44 are set to a right angle to facilitate the rapid driving of the air retained between the wider lower half of the cover body 40 and the funnel brick 2.

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

[0046] Among them reference Figure 2 When the first angled end 43 and the second angled end 44 are set at an acute angle, the cross-section of the cover body 40 is "N"-shaped. At the same time, the bottom end of the first angled end 43 of the cover body 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, it drives the surrounding air to flow outward. The portion of the cover body 40 that extends into the funnel brick 2 causes the inner surface of the cover body 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 center injection pipe 9, and the casting mold to be discharged from the top of the cover body 40.

[0047] Usually in the early stage of pouring, the staff will also introduce argon through the riser or through-hole of the mold to reduce the oxygen content in the mold. At this time, the argon isolation layer on the upper part of the cover body 40 can speed up the discharge of air from the mold, the center 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 is blown out from the upper argon outlet 31, the surrounding air is discharged outward. At this time, the distance between the first angled end 43 and the ladle water inlet 1 is reduced. At this time, the air flow rate is fast and the pressure is low, thereby generating a certain self-priming force. At this time, the surrounding air including the first angled end 43 and the funnel brick 2 will move toward the low-pressure area due to the high pressure, thereby accelerating the discharge of air between the lower half of the cover body 40 and the funnel brick 2, and also making it easier to discharge the air in the funnel brick 2 and the center injection pipe 9.

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

[0051] As the air in the cover 40 is exhausted, the pouring of molten steel begins. At this time, the high-temperature molten steel enters the funnel brick 2 through the ladle nozzle 1. Since the ladle nozzle 1 extends into the funnel brick 2, the exposed travel of the molten steel is reduced, the temperature drop is reduced, and the condensation of cold steel at the lower end of the nozzle and the funnel brick 2 is solved. At the same time, the hot gas generated by the high-temperature molten steel will be discharged upward. At this time, the hot gas is divided into two flows through the first angle end 43. Figure 2 , the first flow direction is to flow upward on the right side of the first angled end 43 and flow 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 obliquely upward at high speed, and the second is the high-temperature hot gas layer. Since a large amount of hot gas always surges upward, it isolates the air from moving downward from the channel between the upper argon ring 30 and the ladle nozzle 1;

[0052] At the same time, the second flow direction of the hot gas flows upward on the left side of the first angle end 43. At this time, the hot gas enters the temperature storage area 45, and the middle argon ring 50 is set at the second angle end 44. At this time, the middle argon ring 50 will be heated in the temperature storage area 45, so that the argon gas entering it will be heated and preheated. At the same time, the preheated argon gas enters the first air vent 41 and the second air vent 42 and will be further heated. At the same time, it absorbs heat and will cool the cover body 40, thereby extending the service life of the cover body 40.

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

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

[0055] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A fully enclosed argon protection device, comprising a ladle nozzle (1), a funnel brick (2) and a center injection pipe (9), characterized in that: Also includes: An upper argon ring (30), a lower argon ring (60), and a cover body (40) installed between the upper argon ring (30) and the lower argon ring (60); An upper argon gas outlet (31) and an upper argon gas inlet (32) are provided on the upper argon gas ring (30); the upper argon gas outlet (31) is provided on the inner side of the upper argon gas ring (30) and opens obliquely upwards; 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 provided below the lower argon ring (60) and is opened downward.

2. A fully enclosed argon protection device according to claim 1, characterized in that: It also includes a refractory fiber (7), which is arranged between the middle injection tube (9) and the lower argon ring (60).

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

4. A fully enclosed argon protection device according to claim 1, characterized in that: The cover body (40) is provided with a first folded angle end (43) and a second folded angle end (44).

5. A fully enclosed argon protection device according to claim 4, characterized in that: The first angled end (43) and the second angled end (44) are both arranged at right angles.

6. A fully enclosed argon protection device according to claim 4, characterized in that: The first angled end (43) and the second angled end (44) are both arranged at acute angles.

7. A fully enclosed argon protection device according to claim 6, characterized in that: 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).

8. The fully enclosed argon protection device according to claim 6, characterized in that: The cover body (40) forms a temperature storage area (45) at the second angled end (44).

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

Images