A split type flow channel

Abstract

The application discloses a kind of up and down split flow steel tank, including upper tank body and lower tank body, the upper tank body with the lower tank body is connected using splicing structure, the upper tank body is connected by four parts, the lower tank body is integrally formed structure;The flow steel tank is sequentially divided into import section flow steel tank, first flow steel tank, second flow steel tank and export section flow steel tank;The preparation material of the upper tank body is clay brick or magnesite brick, and the preparation material of the lower tank body includes alumina, quartz sand and zirconium oxide.The lower tank body of the up and down split flow steel tank is integrally formed structure, neither leakage nor pollution;The upper tank body is detachable segmented structure, can be individually disassembled and replaced, save cost, improve work efficiency;Zirconium oxide is introduced in the preparation material of the lower tank body, can reduce the porosity of material surface, make material more dense, the prepared lower tank body does not react with steel liquid, while the mechanical strength, wear resistance and erosion resistance of the lower tank body are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of metal smelting equipment, specifically relating to a split-type steel flow channel. Background Technology

[0002] Flow troughs are mainly used in the iron and steel metallurgy and casting industries to transport molten steel. Specifically, molten steel is poured from a ladle or furnace into the buffer zone of the flow trough. The molten steel flows along the trough to the end, where it enters the ingot mold or die. When casting ingots after alloy smelting in a vacuum induction furnace, the slag and molten steel are mixed together without separation. Direct casting would result in an alloy with too low purity and too many impurities, failing to meet production requirements. Therefore, a flow trough is used before casting. By first pouring the molten steel into the flow trough, filtering it, and then pouring it into the ingot mold, an alloy meeting production requirements is obtained.

[0003] Traditional steel troughs are made of clay or other refractory materials and are typically manufactured using a one-piece molding process. However, traditional steel troughs have significant drawbacks, such as: high internal stress during manufacturing, gaps in the mold, unstable structure, poor quality, and susceptibility to breakage during handling and use; poor high-temperature resistance, making them prone to cracking under high temperatures during use; and a tendency to react with molten metal, contaminating the metal's quality, while the residual molten metal on the inner wall is difficult to clean.

[0004] Furthermore, the bottom of the steel flow channel is usually the most vulnerable to damage. While minor damage can be repaired with materials, repeated use can lead to severe bottom damage that cannot be repaired, necessitating replacement. However, traditional steel flow channels are molded in one piece, requiring the entire channel to be replaced, which is both time-consuming and expensive. Moreover, the new channel needs extensive cleaning before use, demanding even more manpower and resources and significantly reducing the efficiency of the alloy production process.

[0005] The invention patent with publication number CN110479971A discloses an ultra-thin aluminum-based steel flow channel. The channel has a segmented structure, including a receiving channel, a first steel flow channel, a second steel flow channel, and a discharge channel connected in sequence. The channel has a layered structure, with a refractory layer, a transition layer, a reinforcing layer, and a protective layer arranged sequentially from the inside out. This layered structure is prepared by coating. The channel wall thickness is 12-25mm. This patented technology divides the steel flow channel into four segments. During assembly, gaps inevitably occur between each pair of segments. Although fasteners are used for connection, it is not a one-piece structure, so repair material is needed to fill the gaps between each pair of segments. However, the repair material can contaminate the molten steel. In addition, the layered structure of the channel is prepared by coating, and the four layers use different materials. However, different materials have different thermal expansion after heating, so the coating material is easy to peel off. Although this patented technology can make the steel trough thinner and lighter, saving costs, it still has some technical defects. Therefore, it is urgent to develop a new type of steel trough to solve these defects. It is necessary to further develop the structure of the steel trough and the material formula of the trough body. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a split-type steel flow channel, comprising an upper channel body and a lower channel body, wherein the upper channel body and the lower channel body are connected by a splicing structure; the upper channel body is composed of four connected parts, and the lower channel body is a one-piece molded structure.

[0007] Preferably, the steel flow channel is divided into an inlet section steel flow channel, a first section steel flow channel, a second section steel flow channel, and an outlet section steel flow channel in sequence.

[0008] In any of the above embodiments, it is preferred that the inlet section of the steel flow channel is divided into a molten steel buffer zone, a molten steel transition zone, and a molten steel direct flow zone in sequence. The volume ratio of the molten steel buffer zone, the molten steel transition zone, and the molten steel direct flow zone is 2-2.5:0.5-1:1.

[0009] In any of the above embodiments, it is preferred that the molten steel transition zone is provided with a transition slope; a first baffle groove is provided in the molten steel direct flow zone, a first slag-blocking plate is provided in the first baffle groove, and a first slag-blocking dam is provided on one side of the first baffle groove. The angle between the transition slope and the molten steel buffer zone and the molten steel direct flow zone is 120-150°.

[0010] In any of the above embodiments, a preferred embodiment is that a second baffle trough and a third baffle trough are sequentially arranged within the outlet section steel trough. A second slag-blocking plate is arranged within the second baffle trough, and a filter plate is arranged within the third baffle trough. A second slag-blocking dam is arranged between the second and third baffle troughs, close to the second baffle trough. The filter plate is made of foamed ceramic material.

[0011] In any of the above embodiments, it is preferred that a steel outlet is provided at the end of the outlet section steel trough.

[0012] In any of the above embodiments, the preferred splicing structure between the upper tank and the lower tank is as follows: the bottom surface of the upper tank is a right-angled structure, and the right angle is located on the inner side of the upper tank; the top surface of the lower tank is a right-angled structure, and the right angle is located on the outer side of the lower tank; the right-angled structure of the upper tank matches the right-angled structure of the lower tank, and the inner side of the upper tank and the inner side of the lower tank are on the same plane.

[0013] The inlet section, first section, second section, and outlet section of the steel trough are connected to the upper tank body using a snap-fit ​​structure. This snap-fit ​​structure is as follows: when two adjacent sections of the steel trough are connected, one end of one section protrudes outwards, while the end of the connected section is recessed inwards, with the recessed portion having an inclination angle of 15-30°.

[0014] In any of the above embodiments, it is preferred that the height of the lower trough is 35-40% of the overall height of the steel trough. The steel trough is a U-shaped structure with a wider upper opening and a narrower lower opening, with an outer length of at least 4m, a thickness of 15-20mm for the upper trough, and a thickness of 20-30mm for the lower trough.

[0015] In any of the above embodiments, it is preferred that the top surface of the first slag-blocking dam is 5-10 mm higher than the bottom surface of the first slag-blocking plate; and the top surface of the second slag-blocking dam is 5-10 mm higher than the bottom surface of the second slag-blocking plate. The gap between the bottom of the first baffle groove, the second baffle groove, and the third baffle groove is 15-20 mm.

[0016] In any of the above embodiments, it is preferred that the upper tank is made of clay brick or magnesia brick; and the lower tank is made of alumina (AL2O3), quartz sand (SiO2), and zirconium oxide (ZrO2).

[0017] In the preparation materials of the lower tank, the mass percentage of each substance is as follows: alumina 85-94%, quartz sand 4-10%, zirconium oxide 1.5-5%, and other substances (impurities, TiO2, etc.) 0-0.5%.

[0018] In this invention, the addition of zirconium oxide and the amount of zirconium oxide added are crucial. The amounts of zirconium oxide added for different particle sizes are as follows: 65-75% of the total zirconium oxide with a particle size of 0.15-0.5 mm, 15-25% of the total zirconium oxide with a particle size of 0.074-0.15 mm, and 5-15% of the total zirconium oxide with a particle size of 0.048-0.074 mm.

[0019] The lower tank body of the split-type steel flow trough of this invention is a key component, as the molten steel ultimately flows within it. Therefore, the structural design and material selection of the lower tank body require high precision. The lower tank body must be leak-proof and free from contamination, and it must also avoid cracking due to the large length-to-width ratio of the steel flow trough. The split-type steel flow trough of this invention has the following advantages:

[0020] 1. The lower tank of the steel flow channel is a one-piece molded structure, which is both leak-proof and pollution-free.

[0021] 2. The upper part of the steel trough is a detachable segmented structure. When a section is damaged, it can be disassembled and replaced individually, thereby saving costs and improving work efficiency.

[0022] 3. The upper body of the steel trough is made of more economical and practical refractory materials such as clay bricks or magnesia bricks, which can further save costs.

[0023] 4. Zirconia is introduced into the material used to prepare the lower tank of the steel trough. The lower tank prepared according to the material composition of this invention has the following characteristics: the working temperature reaches at least 1800℃; it can reduce the porosity of the material surface, making the material more compact; the prepared lower tank does not react with the molten steel; it improves the mechanical strength and flexural strength of the lower tank; it improves the wear resistance and erosion resistance; there is no powder inclusion on the surface; it is more durable and less prone to damage. Attached Figure Description

[0024] Figure 1 This is a perspective view of a preferred embodiment of the split-type steel flow channel according to the present invention;

[0025] Figure 2 for Figure 1 The front view of the split steel trough in the embodiment shown;

[0026] Figure 3 for Figure 1 The schematic diagram of the inlet section steel trough in the embodiment shown;

[0027] Figure 4 for Figure 1 The diagram shows the structure of the outlet section steel trough in the embodiment shown.

[0028] Figure 5 for Figure 1 The diagram shows the splicing structure between the upper and lower tank bodies in the embodiment shown.

[0029] Figure 6 for Figure 1 The diagram shows the snap-fit ​​structure between the four parts of the upper groove in the embodiment shown.

[0030] The diagram is labeled as follows: 1-Upper tank, 2-Lower tank, 3-Inlet section steel flow channel, 4-First steel flow channel, 5-Second steel flow channel, 6-Outlet section steel flow channel, 7-Splicing structure, 8-Snap-fit ​​structure, 31-Steel molten buffer zone, 32-Steel molten transition zone, 33-Steel molten direct flow zone, 34-Transition slope, 35-First baffle channel, 36-First slag dam, 61-Second baffle channel, 62-Third baffle channel, 63-Second slag dam, 64-Steel outlet, 71-Right-angle structure, 81-Protruding, 82-Recessed. Detailed Implementation

[0031] To further understand the invention, the following detailed description of the invention will be provided in conjunction with specific embodiments.

[0032] Example 1:

[0033] like Figure 1-4 As shown, according to a preferred embodiment of the split-type steel trough of the present invention, it includes an upper trough body 1 and a lower trough body 2, which are connected by a splicing structure 7; the upper trough body 1 is composed of four connected parts, and the lower trough body 2 is a one-piece molded structure. The steel trough as a whole is sequentially divided into an inlet section steel trough 3, a first steel trough 4, a second steel trough 5, and an outlet section steel trough 6.

[0034] The steel trough is a U-shaped structure, wider at the top and narrower at the bottom, with an outer length of 4m. The thickness of the upper trough is 20mm, and the thickness of the lower trough is also 20mm. The height of the lower trough is 35% of the overall height of the steel trough.

[0035] The inlet section of the steel flow channel 3 is sequentially divided into a steel flow buffer zone 31, a steel flow transition zone 32, and a steel flow direct zone 33. The volume ratio of the steel flow buffer zone 31, the steel flow transition zone 32, and the steel flow direct zone 33 is 2:1:1. The steel flow transition zone 32 is provided with a transition slope 34, and the angle between the transition slope 34 and the steel flow buffer zone 31 and the steel flow direct zone 33 is 120°. A first baffle groove 35 is provided in the steel flow direct zone 33, and a first slag baffle plate is provided in the first baffle groove. A first slag baffle dam 36 is provided on one side of the first baffle groove 35. The first slag baffle plate is inserted into the steel flow channel along the first baffle groove, and the first slag baffle plate maintains a certain distance from the bottom of the steel flow channel. The gap at the bottom of the first baffle groove is 15mm, and the top surface of the first slag baffle dam is 5mm higher than the bottom surface of the first slag baffle plate.

[0036] A second baffle groove 61 and a third baffle groove 62 are sequentially arranged within the outlet section steel trough 6. A second slag-blocking plate is installed in the second baffle groove, and a foam ceramic filter plate is installed in the third baffle groove. A second slag-blocking dam 63 is installed between the second baffle groove 61 and the third baffle groove 62, near the second baffle groove 61. A steel outlet 64 is provided at the end of the outlet section steel trough 6. The second slag-blocking plate is inserted into the steel trough along the second baffle groove, maintaining a certain distance from the bottom of the steel trough. The gap at the bottom of the second baffle groove is 15mm. The top surface of the second slag-blocking dam is 5mm higher than the bottom surface of the second slag-blocking plate. The foam ceramic filter plate is inserted into the steel trough along the third baffle groove, maintaining a certain distance from the bottom of the steel trough. The gap at the bottom of the third baffle groove is 15mm.

[0037] like Figure 5 As shown, the splicing structure 7 between the upper tank 1 and the lower tank 2 is as follows: the bottom surface of the upper tank 1 is a right-angle structure 71, and the right angle is set on the inner side of the upper tank; the top surface of the lower tank 2 is a right-angle structure 71, and the right angle is set on the outer side of the lower tank; the right-angle structure 71 of the upper tank 1 matches the right-angle structure 71 of the lower tank 2, and the inner side of the upper tank 1 and the inner side of the lower tank 2 are on the same plane.

[0038] like Figure 6 As shown, the inlet section steel trough 3, the first steel trough 4, the second steel trough 5, and the outlet section steel trough 6 are connected in the upper tank body 1 by a snap-fit ​​structure 8. This snap-fit ​​structure is as follows: when two adjacent steel troughs are connected, one end of one steel trough protrudes outward 81, and the end of the connected steel trough is recessed inward 82, with the recessed portion having an inclination angle of 15°.

[0039] The upper tank is made of clay bricks; the lower tank is made of alumina (Al₂O₃), silica sand (SiO₂), and zirconium oxide (ZrO₂). The mass percentages of each substance in the lower tank are: alumina 85%, silica sand 10%, zirconium oxide 4.5%, and other substances (impurities, TiO₂, etc.) 0.5%. The addition of zirconium oxide and its amount are crucial. The addition amounts for different particle sizes of zirconium oxide are as follows: 65% for 0.15-0.5 mm particle size, 25% for 0.074-0.15 mm particle size, and 10% for 0.048-0.074 mm particle size.

[0040] In this embodiment, the lower tank body of the split steel trough is a key component. The molten steel ultimately flows in the lower tank body, so the structural design and material selection of the lower tank body are subject to high requirements. The lower tank body must not leak or cause pollution, and it is also necessary to avoid cracking caused by the large length-to-width ratio of the steel trough. The upper and lower split steel trough of this embodiment has the following advantages: (1) The lower tank of the steel trough is an integrally formed structure, which is neither leak-proof nor contaminated; (2) The upper tank of the steel trough is a detachable segmented structure. When a certain section is damaged, it can be disassembled and replaced separately, thereby saving costs and improving work efficiency; (3) The upper tank of the steel trough is made of more economical and practical refractory materials such as clay bricks or magnesia bricks, which can further save costs; (4) Zirconia is introduced into the preparation material of the lower tank of the steel trough. The lower tank prepared according to the material composition of this embodiment has the following characteristics: the working temperature reaches at least 1800℃; it can reduce the porosity of the material surface and make the material more compact; the lower tank does not react with the molten steel; it improves the mechanical strength and flexural strength of the lower tank; it improves the wear resistance and erosion resistance; there is no powder inclusion on the surface; it is more durable and not easily damaged.

[0041] Example 2:

[0042] According to another preferred embodiment of the split-type steel trough of the present invention, its overall structure, the connection relationship between the components, the working principle, and the beneficial effects are the same as those of embodiment one, except that:

[0043] The height of the lower tank is 40% of the overall height of the steel flow trough; the thickness of the upper tank is 15mm, and the thickness of the lower tank is 30mm. The volume ratio of the molten steel buffer zone, the molten steel transition zone, and the molten steel direct flow zone is 2.5:0.5:1. The angle between the transition slope and the molten steel buffer zone and the molten steel direct flow zone is 150°. The gap between the bottom of the first baffle trough, the second baffle trough, and the third baffle trough is 20mm. The top surface of the first slag-blocking dam is 10mm higher than the bottom surface of the first slag-blocking plate, and the top surface of the second slag-blocking dam is 10mm higher than the bottom surface of the second slag-blocking plate. The inclination angle of the recessed part in the snap-fit ​​structure is 30°.

[0044] In the preparation materials of the lower tank, the mass percentages of each substance are as follows: alumina 94%, quartz sand 4%, zirconium oxide 1.5%, and other substances (impurities, TiO2, etc.) 0.5%. The addition of zirconium oxide and the amount added are crucial. The addition amounts for zirconium oxide with different particle sizes are as follows: 0.15-0.5 mm zirconium oxide accounts for 75% of the total zirconium oxide; 0.074-0.15 mm zirconium oxide accounts for 20% of the total zirconium oxide; and 0.048-0.074 mm zirconium oxide accounts for 5% of the total zirconium oxide.

[0045] Example 3:

[0046] According to another preferred embodiment of the split-type steel trough of the present invention, its overall structure, the connection relationship between the components, the working principle, and the beneficial effects are the same as those of embodiment one, except that:

[0047] The height of the lower tank is 38% of the overall height of the steel flow trough; the thickness of the upper tank is 18mm, and the thickness of the lower tank is 25mm. The volume ratio of the molten steel buffer zone, the molten steel transition zone, and the molten steel direct flow zone is 2.2:0.8:1. The angle between the transition slope and the molten steel buffer zone and the molten steel direct flow zone is 135°. The gap between the bottom of the first baffle trough, the second baffle trough, and the third baffle trough is 18mm. The top surface of the first slag-blocking dam is 8mm higher than the bottom surface of the first slag-blocking plate, and the top surface of the second slag-blocking dam is 8mm higher than the bottom surface of the second slag-blocking plate. The inclination angle of the recessed part in the snap-fit ​​structure is 25°.

[0048] In the preparation materials of the lower tank, the mass percentages of each substance are: alumina 90%, quartz sand 7%, and zirconium oxide 3%. The addition of zirconium oxide and the amount added are crucial. Specifically, the addition amounts of zirconium oxide with different particle sizes are: 0.15-0.5 mm particle size: 70% of the total zirconium oxide; 0.074-0.15 mm particle size: 15% of the total zirconium oxide; and 0.048-0.074 mm particle size: 15% of the total zirconium oxide.

[0049] The steel trough was prepared using the technical solutions of the three embodiments described above. Since the lower trough body is a key component, a comprehensive performance test was conducted on the lower trough body. The test results are shown in Table 1.

[0050] Table 1 Performance test results of the lower tank

[0051]

[0052] illustrate:

[0053] (1) Permanent linear change test: The test results at 1600℃.

[0054] (2) Thermal shock test: 1400℃, 5 thermal cycles, flexural strength loss rate is 5-7%.

[0055] Comparative example:

[0056] The invention patent CN110479971A, cited in the background section, discloses an ultra-thin aluminum-based steel flow channel. The channel has a segmented structure, including a receiving channel, a first steel flow channel, a second steel flow channel, and a discharging channel connected sequentially. The channel has a layered structure, with a refractory layer, a transition layer, a reinforcing layer, and a protective layer sequentially arranged from the inside out. This layered structure is prepared by coating. The patent describes the performance test results of the steel flow channel, as shown in Table 2.

[0057] Table 2 Performance test results of the steel trough (CN110479971A)

[0058]

[0059] Comparing and analyzing the test results in Tables 1 and 2, it is found that the upper and lower split steel trough of the present invention has higher strength, reduces the risk of slag shedding during use, has a lower surface porosity, which can effectively prevent the molten steel from reacting with the steel trough, and at the same time reduce the erosion process, resulting in better performance.

[0060] Special Note: The technical solution of this invention involves numerous parameters, and the synergistic effects between these parameters must be comprehensively considered to achieve the beneficial effects and significant progress of this invention. Furthermore, the value ranges of each parameter in the technical solution were obtained through extensive experimentation. For each parameter and the combinations thereof, the inventors have recorded a large amount of experimental data; however, due to space limitations, the specific experimental data is not disclosed here.

[0061] Those skilled in the art will readily understand that the upper and lower split steel trough of the present invention includes any combination of the inventive content and specific embodiments described in the above specification and the various parts shown in the accompanying drawings. Due to space limitations and for the sake of brevity, not all of these combinations have been described in detail. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A split-type steel flow channel, characterized in that: The application relates to a flow steel groove, which comprises an upper groove body and a lower groove body, and the upper groove body and the lower groove body are connected through a splicing structure; the upper groove body is connected by four parts; and the lower groove body is an integral forming structure. The splicing structure between the upper groove body and the lower groove body is that the bottom surface of the upper groove body is a right-angle structure and is arranged on the inner side of the upper groove body; the top surface of the lower groove body is a right-angle structure and is arranged on the outer side of the lower groove body; the right-angle structure of the upper groove body is matched with the right-angle structure of the lower groove body, and the inner side of the upper groove body and the inner side of the lower groove body are on the same plane. The inlet section flow steel groove, the first flow steel groove, the second flow steel groove and the outlet section flow steel groove are connected through a buckle structure, and the buckle structure is that when two adjacent flow steel grooves are connected, one end of one flow steel groove is outwardly protruded, and the end surface of the other flow steel groove is inwardly recessed, and the inclination angle of the recessed part is 15-30 DEG. The flow steel groove is a U-shaped structure with wide upper opening and narrow lower opening, the length of the outer side is at least 4 m, the thickness of the upper groove body is 15-20 mm, the thickness of the lower groove body is 20-30 mm, and the height of the lower groove body is 35-40% of the height of the whole flow steel groove. The inlet section flow steel groove is sequentially divided into a steel liquid buffer area, a steel liquid transition area and a steel liquid straight flow area, the volume ratio of the steel liquid buffer area, the steel liquid transition area and the steel liquid straight flow area is 2-2.5:0.5-1:1, the steel liquid transition area is provided with a transition inclined surface, and the included angles between the transition inclined surface and the steel liquid buffer area and the steel liquid straight flow area are both 120-150 DEG. The steel liquid straight flow area is provided with a first baffle groove, the first baffle groove is provided with a first slag baffle, one side of the first baffle groove is provided with a first slag dam, and the top surface of the first slag dam is 5-10 mm higher than the bottom surface of the first slag baffle. The outlet section flow steel groove is sequentially provided with a second baffle groove and a third baffle groove, the second baffle groove is provided with a second slag baffle, the third baffle groove is provided with a filter plate, and the second baffle groove is provided with a second slag dam between the second baffle groove and the third baffle groove and close to the second baffle groove, and the top surface of the second slag dam is 5-10 mm higher than the bottom surface of the second slag baffle. The preparation material of the upper groove body is clay brick or magnesia brick, the preparation material of the lower groove body comprises alumina, quartz sand and zirconia, the mass percentage of each substance in the preparation material of the lower groove body is as follows: 85-94% of alumina, 4-10% of quartz sand, 1.5-5% of zirconia and 0-0.5% of other substances, wherein the addition amount of zirconia with different particle sizes is as follows: the addition amount of 0.15-0.5 mm particle size zirconia is 65-75% of the total amount of zirconia, the addition amount of 0.074-0.15 mm particle size zirconia is 15-25% of the total amount of zirconia, and the addition amount of 0.048-0.074 mm particle size zirconia is 5-15% of the total amount of zirconia.

2. The upper and lower split type flow tundish according to claim 1, wherein: The end of the outlet section flow steel groove is provided with a tapping hole.

Images