Anti-impact system for tundish

Abstract

The utility model discloses a tundish anti-impact system which comprises a flow stabilizer and a protection pipe, the outlet end of the protection pipe faces the flow stabilizer, molten steel flows into the flow stabilizer through the protection pipe, a flow dividing layer is arranged in the flow stabilizer, a flow dividing channel is formed in the flow dividing layer, one end of the flow dividing channel is arranged towards the impact direction of the molten steel, and the other end of the flow dividing channel is arranged towards the impact direction of the molten steel. The other end of the flow dividing channel penetrates out of the flow dividing layer and is communicated with fluid in the inner space of the flow stabilizer, and the steel flow enters the flow dividing channel after impacting the flow dividing layer and is dispersed into multiple strands of steel flow. According to the flow stabilizer, the flow dividing blocks matched with one another are arranged in the flow stabilizer, the flow dividing channels extending in all directions are formed, when the flow stabilizer bears impact of molten steel, the steel flow can be dispersed into a plurality of small steel flows in different flow directions, the impact speed of the molten steel is slowed down, the impact force is reduced, and the molten steel slowly reaches the bottom of the flow stabilizer through the flow dividing channels; the impact force of molten steel on the bottom of the flow stabilizer can be reduced to the maximum extent, and damage to the flow stabilizer or the ladle bottom is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of refractory materials for steel production. Specifically, it is a mid-layer impact protection system. Background Technology

[0002] The steel industry is a fundamental industry in my country. The tundish metallurgy process is a crucial link in steel production. Currently, with the extended lifespan of sizing nozzles (around 70 hours) and the improved lifespan of refractory linings in the tundish, continuous pouring time in the tundish is becoming increasingly longer, even reaching tens of hours. This leads to increasingly severe damage to the impact zone of the tundish. Based on current on-site conditions of impact tundishes in steel plants, even with the bottom thickness of the flow stabilizer (or impact tundish, impact plate) increased to around 400-500mm, deep holes still appear in the steel-bearing area, sometimes even penetrating the flow stabilizer (or impact tundish, impact plate), and even the bottom of the tundish, resulting in steel leakage accidents. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to provide a long-life molten metal transfer system for tundishes and related structures that improves their service life.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a tundish anti-impact system, including a flow stabilizer and a protective pipe. The outlet end of the protective pipe is set towards the molten steel inlet of the flow stabilizer. Molten steel flows into the flow stabilizer through the protective pipe. A flow divider layer is provided inside the flow stabilizer. The flow divider layer has a flow divider channel. One end of the flow divider channel is set towards the impact direction of the molten steel. The other end of the flow divider channel extends out from the flow divider layer and is in fluid communication with the internal space of the flow stabilizer. After the molten steel impacts the flow divider layer, it enters the flow divider channel and is dispersed into multiple streams of molten steel. The protective pipe has at least one outlet on the side or bottom. The total number of outlets on the side and bottom is greater than or equal to two. The equivalent circle diameter of the total area of ​​the outlets on the side and bottom is 20-400 mm.

[0005] In the aforementioned intermediate ladle anti-impact system, the diversion channel includes a vertical channel arranged along the height direction of the diversion layer, one end of the vertical channel faces the impact direction of the molten steel, and the other end of the vertical channel extends toward the bottom of the flow stabilizer and is in fluid communication with the internal space of the flow stabilizer;

[0006] Alternatively, the diversion channel may include a vertical channel arranged along the height direction of the diversion layer, one end of the vertical channel facing the direction of the molten steel impact, and the other end of the vertical channel extending toward the bottom of the flow stabilizer and communicating with the fluid inside the flow stabilizer; and the diversion channel may also include a horizontal channel arranged along the length and / or width direction of the diversion layer, the horizontal channel communicating with the vertical channel, and at least one end of the horizontal channel extending out of the diversion layer and communicating with the fluid inside the flow stabilizer;

[0007] Alternatively, the diversion channel may include a curved channel, one end of which faces the direction of the molten steel impact, and the other end of which is in fluid communication with the internal space of the flow stabilizer.

[0008] The flow distribution layer is a single unit, and the flow distribution channel is located inside the single unit; or the flow distribution layer is composed of multiple single units, and the flow distribution channel includes gaps formed between adjacent single units and / or fluid channels formed inside the single unit.

[0009] The aforementioned mid-pack shockproof system includes a diversion layer comprising two or more cooperating diversion blocks, which are disposed on the inner bottom wall of the flow stabilizer; the surface of each diversion block has an outwardly extending protrusion, and two adjacent diversion blocks are connected to each other through the protrusion, and the gap formed by the support of two adjacent diversion blocks through the protrusion is the diversion channel;

[0010] Alternatively, the diversion layer may include two or more cooperating diversion blocks, which are disposed on the inner bottom wall of the flow stabilizer; the surface of the diversion block has an outwardly extending protrusion, and the gap formed between two adjacent diversion blocks is the diversion channel;

[0011] The diversion block is an I-shaped diversion block, a twisted I-shaped diversion block, a king-shaped diversion block, a twisted king-shaped diversion block, a four-column radial diversion block, a four-legged hollow column diversion block, a cuboid diversion block with chamfered pyramidal holes, a frustum-shaped diversion block, a conical diversion block, a frustum-shaped diversion block, or a pyramidal diversion block, or any combination thereof; the twisted I-shaped diversion block is formed by rotating one horizontal stroke of the I-shape around the vertical stroke of the I-shape with an angle greater than 0 degrees and less than or equal to 90 degrees; the twisted king-shaped diversion block is formed by rotating the middle horizontal stroke of the king-shape around the vertical stroke of the king-shape with an angle greater than 0 degrees and less than or equal to 90 degrees; the four-column radial diversion block includes a central connection. The block consists of a central connecting block and four cylinders or frustums, each cylinder or frustum having one end fixed to the central connecting block and the other end extending away from the central connecting block in different directions; the four-legged hollow column diverter block includes a plate-shaped body, four frustums fixed to one surface of the plate-shaped body, and four frustums fixed to another surface of the plate-shaped body, with the free end of each frustum extending away from the plate-shaped body, and a through hole penetrating the plate surface being opened in the center of the plate-shaped body; the chamfered and tapered cubic diverter block is a cube with four corners cut off, edges cut parallel to each edge, and frustum holes opened on each face, with the frustum holes on opposite faces connected to the fluid through the small end.

[0012] The aforementioned mid-pack shockproof system includes a reinforced impact plate on the inner bottom wall of the flow stabilizer, and a diverter block disposed on the surface of the reinforced impact plate. The diverter blocks are distributed diffusely from the reinforced impact plate toward the inner bottom wall of the flow stabilizer. There is a gap between the outermost diverter block and the inner vertical wall of the flow stabilizer.

[0013] The aforementioned mid-pack impact protection system includes a reinforced impact plate that is impregnated, vacuum impregnated, vacuum impregnated and then pressure-strengthened, or heat-treated, vacuum impregnated and then pressure-strengthened. Impregnation can be inorganic or organic. Inorganic impregnation may use alumina sol, chromium oxide sol, zirconium oxide sol, spinel sol, silica sol, or a composite inorganic sol of two or more of these. Preferably, the composite inorganic sol is an alumina-chromium oxide composite sol. The adhesive, chromium oxide-zirconia composite sol, or magnesium aluminum spinel sol, wherein the mass ratio of chromium oxide to zirconium oxide in the chromium oxide-zirconia composite sol is (1-2):(2-4); the reinforced impact plate is impregnated with alumina-chromium oxide composite sol and then subjected to infinite solid solution of chromium oxide and alumina at high temperature to form spinel chromium corundum; the organic impregnation uses one or more of asphalt, tar, anthracite, or resin, wherein the resin is epoxy resin or phenolic resin; the reinforced impact plate is manufactured using a floating worktable.

[0014] During the preparation of the reinforced impact plate and / or the flow divider block, toughening nanoparticles are added to strengthen their microstructure. The amount of toughening nanoparticles used is 0-3% of the mass of the reinforced impact plate and / or the flow divider block. The particle size of the toughening nanoparticles is less than or equal to 100 nanometers. The toughening nanoparticles are selected from magnesium oxide powder, α-alumina powder, zirconium dioxide powder, or silicon dioxide powder. The particle size of α-alumina powder is greater than 0 and less than or equal to 30 nanometers, which improves the toughness of the reinforced impact plate and the flow divider block by more than 40%.

[0015] In the aforementioned shockproof system for intermediate packaging, a protrusion is provided on the inner vertical wall of the current stabilizer; at least one side wall outlet is provided on the side wall of the protective tube, and 0-3 bottom outlets are provided on the bottom of the protective tube; the total number of the side wall outlets and the bottom outlets is greater than or equal to 2, and the equivalent circle diameter of the total area of ​​the side wall outlets and the bottom outlets is 20-400mm.

[0016] In the aforementioned shockproof system, an edge diversion layer is provided on the inner bottom wall of the flow stabilizer near the inner vertical wall. The thickness of the edge diversion layer gradually decreases in the direction from the outside of the flow stabilizer to the center of the flow stabilizer, and the slope ratio of the edge diversion layer is less than 1:1.25.

[0017] The aforementioned mid-pack shockproof system includes an edge diversion layer comprising two or more central fixing plates and support columns. Each of the four corners of the central fixing plate is vertically fixed with a support column. A through hole is provided in the center of the central fixing plate. A groove is provided on the side wall of the central fixing plate between two adjacent support columns. The support columns on the two adjacent central fixing plates are fitted together and connected. The direction of the support column intersects with the bottom wall of the flow stabilizer.

[0018] In the aforementioned impact protection system for intermediate packaging, a steel outlet is provided on the side wall of the protective tube.

[0019] The aforementioned mid-pack shockproof system includes a flow stabilizer comprising a base plate, an inner U-shaped frame, and an outer U-shaped frame. Both the inner and outer U-shaped frames are mounted on the base plate. One end of the inner U-shaped frame has a first opening, and one end of the outer U-shaped frame has a second opening. The end of the inner U-shaped frame with the first opening is inserted into the outer U-shaped frame through the second opening. A first flow channel is formed between the sidewall of the outer U-shaped frame and the sidewall of the inner U-shaped frame. A flow hole is provided on the sidewall of the inner U-shaped frame, and the flow hole is in fluid communication with the first flow channel. A second flow channel is formed between the end of the inner U-shaped frame with the first opening and the facade of the outer U-shaped frame, and the second flow channel is in fluid communication with the first flow channel.

[0020] The aforementioned impact-resistant mid-frame system includes a U-shaped inner frame comprising a first inner sidewall, a second inner sidewall, and a third inner sidewall. The first and second inner sidewalls are two opposing sidewalls. The third inner sidewall is sealed to the first ends of the first and second inner sidewalls, respectively. The first opening is located between the second ends of the first and second inner sidewalls. The U-shaped outer frame includes a first outer sidewall, a second outer sidewall, and a third outer sidewall. The first and second outer sidewalls are two opposing sidewalls. The third outer sidewall is sealed to the first ends of the first and second outer sidewalls, respectively. The second opening is located between the second ends of the first and second outer sidewalls. A first steel flow channel is formed between the first inner sidewall and the first outer sidewall, and / or between the second inner sidewall and the second outer sidewall. The first inner sidewall and / or the second inner sidewall are provided with the steel flow hole. On a plane perpendicular to the direction of steel flow in the first steel flow channel, the angle between the axis of the steel flow hole and the horizontal line is 15-25°. On a top view plane passing through the steel flow hole, the axis of the steel flow hole is perpendicular to the direction of steel flow in the first steel flow channel. The second end of the second inner sidewall and / or the second end of the first inner sidewall and the third outer sidewall are provided with the second steel flow channel. The top of the first inner sidewall, the second inner sidewall and the third inner sidewall are all provided with protruding edges that are interconnected and extend into the U-shaped inner frame. The portion of the third outer sidewall located between the first inner sidewall and the second inner sidewall is provided with a protruding edge that extends toward the third inner sidewall. The two ends of the protruding edge on the third outer sidewall are respectively connected to the protruding edges on the first inner sidewall and the second inner sidewall.

[0021] The technical solution of this utility model has achieved the following beneficial technical effects:

[0022] 1. When molten steel flows into the stabilizer from a higher position, its gravitational potential energy is almost completely converted into kinetic energy, causing it to impact the bottom of the ladle at a high speed. Conventional stabilizers are typically reinforced by assembling a dense, thickened layer at the bottom. This design rapidly reduces the high-speed flow velocity of the steel to a standstill, and the thickened layer must withstand extremely high impact forces. Even with a thickness of hundreds of millimeters, it is still difficult to resist the impact of the molten steel. This invention, by incorporating cooperating diversion blocks within the stabilizer to form diversion channels extending in various directions, disperses the steel flow into several smaller streams flowing in different directions when subjected to molten steel impact. This slows down the impact velocity and reduces the impact force, allowing the molten steel to slowly reach the bottom of the stabilizer through the diversion channels. This minimizes the impact force of the molten steel on the bottom of the stabilizer, reducing damage to the stabilizer or the ladle bottom and increasing its service life. Furthermore, the diversion channel, composed of multiple diversion blocks, has a good energy storage function, which can unload the impact energy of the steel flow, reduce the force of the molten steel splashing against the protective pipe, and thus improve the service life of the protective pipe accordingly.

[0023] 2. By setting an outward protrusion on the diversion block and inserting the outward protrusion into the diversion channel, the molten steel is further refined when it passes through the diversion channel, which helps to further reduce the impact force of the molten steel.

[0024] 3. The protective tube has multiple outlets, which disperses the impact points on the tundish (impact barrel, flow stabilizer / impact plate), thus reducing the destructive effect and improving the service life of the impact barrel, flow stabilizer / impact plate.

[0025] 4. The vertical side wall of the stabilizer is equipped with protrusions. When the impact plate reaches its limit, it can be tilted to protect the impact sleeve from the side wall, thereby reducing and extending the life of the stabilizer and even the tundish.

[0026] 5. The use of inorganic sol impregnation / organic impregnation diversion blocks and impact plates, with inorganic sol particles / organic matter filling the internal voids, makes the material structure more compact and significantly improves its impact resistance.

[0027] 6. When preparing the flow divider and impact plate, nanoparticles are introduced to fill the pores of the material and improve the microstructure. Among them, the introduction of non-agglomerated 0-30 nanometer α-alumina can increase the toughness by more than 40%.

[0028] 7. The floating worktable pressure method is used to form the impact plate, which solves the problem of forming large-area refractory materials and improves the density of large-area refractory materials in the impact plate.

[0029] 8. The double U-shaped inner and outer vertical frame reverse sleeve structure flow stabilizer allows the steel flow to exit through the inner wall hole and the channel between the second end of the inner wall and the third outer wall, and then enter the flow channel between the inner and outer walls. This flow field is not only conducive to slag-steel separation, but more importantly, it makes the liquid smoother, thus reducing the impact on the ladle and extending the life of the tundish.

[0030] The double U-shaped inner and outer vertical frame reverse sleeve structure flow stabilizer of this utility model breaks through the conventional closed flow stabilizer design. It adopts a double-wall structure, which is designed as two stacked wall surfaces. This design not only opens up two parallel first flow field improvement channels, but also effectively promotes the floating of inclusions in molten steel and improves the quality of billet by optimizing fluid dynamics and reducing the dead zone volume inside the flow stabilizer. The flow field is gentle and has little impact on the flow stabilizer and tundish, thus improving the service life of the flow stabilizer and tundish. Attached Figure Description

[0031] Figure 1 A cross-sectional structural diagram of this utility model;

[0032] Figure 2 A schematic diagram of the twisted king-shaped diverter block in Embodiment 1 of this utility model;

[0033] Figure 3 A schematic diagram of the structure of multiple prismatic flow dividers cooperating with each other in Embodiment 1 of this utility model;

[0034] Figure 4 A schematic diagram of the twisted I-shaped diverter block in Embodiment 2 of this utility model;

[0035] Figure 5 A schematic diagram of the flow divider block in Embodiment 3 of this utility model;

[0036] Figure 6 This utility model contains a schematic diagram of the structure of a center-fixed plate or a four-legged hollow column diverter block.

[0037] Figure 7 A schematic diagram of the edge distribution layer in this utility model;

[0038] Figure 8 A schematic diagram of the triangular pyramid-shaped flow divider in this utility model;

[0039] Figure 9 A schematic diagram of the current stabilizer in this utility model;

[0040] Figure 10 A schematic diagram of the structure of the king-shaped diverter block in this utility model;

[0041] Figure 11 A schematic diagram of the I-shaped diverter block in this utility model;

[0042] Figure 12 A schematic diagram of the structure of the flow divider block in Embodiment 3 of this utility model is a four-column radial flow divider block.

[0043] Figure 13A schematic diagram of the long-life tundish molten metal transfer system of this utility model injecting molten steel into the tundish;

[0044] Figure 14 A schematic diagram of the structure of the four-legged hollow column diverter block in this utility model;

[0045] Figure 15 This utility model presents a schematic diagram of the structure of a chamfered cone-shaped cubic diverter block.

[0046] The reference numerals in the figure are as follows: 1-flow stabilizer; 2-protective tube; 3-flow divider layer; 4-flow divider channel; 5-vertical channel; 6-horizontal channel; 7-reinforced impact plate; 8-edge flow divider layer; 81-center fixing plate; 82-support column; 83-through hole; 84-groove; 9-steel outlet; 10-flow divider block; 101-outer protrusion; 11-protrusion; 12-bottom plate; 13-U-shaped inner frame; 14-first inner sidewall; 15-second inner sidewall; 16-third inner sidewall; 17-U-shaped outer frame; 18-first outer sidewall; 19-second outer sidewall; 20-third outer sidewall; 21-first opening; 22-second opening; 23-first steel flow channel; 24-steel flow hole; 25-second steel flow channel; 26-protruding edge. Detailed Implementation

[0047] Example 1

[0048] The long-life molten metal transport system in this embodiment, such as Figure 1 As shown, the device includes a flow stabilizer 1 and a protective tube 2. The outlet end of the protective tube 2 faces the flow stabilizer 1. The protective tube 2 has at least one outlet 9 on its side or bottom. In this embodiment, the protective tube 2 has 2-4 outlets 9 on its side, and the bottom of the protective tube 2 is closed. In other embodiments, the protective tube 2 may also have an outlet 9 at its bottom; the total number of outlets 9 on the side and at the bottom is greater than or equal to 2, and the equivalent circle diameter of the total area of ​​the outlets 9 on the side and at the bottom is 20-400 mm.

[0049] like Figure 1 As shown, molten steel flows into the flow stabilizer 1 through the protective pipe 2. The flow stabilizer 1 is provided with a flow divider layer 3, and a flow divider channel 4 is opened in the flow divider layer 3. One end of the flow divider channel 4 is set facing the impact direction of the molten steel, and the other end of the flow divider channel 4 extends out from the flow divider layer 3 and is in fluid communication with the internal space of the flow stabilizer 1. After the steel flow impacts the flow divider layer 3, it enters the flow divider channel 4 and is dispersed into multiple steel flows.

[0050] The shunt channel 4 includes a vertical channel 5 arranged along the height direction of the shunt layer 3. One end of the vertical channel 5 faces the direction of the molten steel impact, and the other end of the vertical channel 5 extends towards the bottom of the flow stabilizer 1 and is in fluid communication with the flow stabilizer 1. The vertical channel 5 can be arranged parallel to the height direction of the shunt layer 3 or can have a certain angle relative to the height direction of the shunt layer 3.

[0051] The shunt channel 4 further includes a horizontal channel 6 arranged along the length and / or width direction of the shunt layer 3. The horizontal channel 6 is arranged inside the shunt layer 3 and / or between the shunt layer 3 and the flow stabilizer 1; the horizontal channel 6 is in fluid communication with the vertical channel 5, and at least one end of the horizontal channel 6 penetrates out of the shunt layer 3 and is in fluid communication with the flow stabilizer 1. The horizontal channel 6 is arranged in the horizontal direction or has a certain included angle with the horizontal direction.

[0052] As Figure 2-3 shown, the shunt layer 3 includes two or more cooperating shunt blocks 10. The shunt blocks 10 are arranged on the inner bottom wall of the flow stabilizer 1; the surface of the shunt block 10 has an outwardly extending convex portion 101. Adjacent two shunt blocks 10 are connected to each other through the convex portion 101, and the gap formed by the support of adjacent two shunt blocks 10 through the convex portion 101 is the shunt channel 4. In this embodiment, the shape of the shunt block 10 is as Figure 2 shown, a twisted king-shaped shunt block (the twisted king-shaped shunt block is formed by rotating the middle horizontal line of the king character 90 degrees around one vertical line of the king character). Outer convex portions 101 are provided at both ends of the shunt block 10 and are parallel to each other. An outer convex portion 101 is also provided in the middle of the shunt block 10. The outer convex portions 101 at both ends of the shunt block 10 and the outer convex portion 101 in the middle of the shunt block 10 are arranged perpendicular to each other. As Figure 3 shown, a plurality of prismatic shunt blocks 10 are combined and arranged to form an integral shunt layer 3, and have shunt channels 4 with different directions, which can play a role in shunting and reducing the impact force. Specifically, when arranged, two or more layers of shunt blocks 10 can play a better shunting role. Of course, in this embodiment, a king-shaped shunt block as Figure 10 shown can also be used.

[0053] As Figure 1 shown, a reinforcing impact plate 7 is arranged on the inner bottom wall of the flow stabilizer 1, and the shunt blocks 10 are arranged on the surface of the reinforcing impact plate 7.

[0054] The reinforced impact plate 7 can be selected as an impregnated reinforced impact plate, a vacuum impregnated reinforced impact plate, a reinforced impact plate that is vacuum impregnated and then pressure-strengthened, or a reinforced impact plate that is first heat-treated, then vacuum impregnated, and then pressure-strengthened. It can be impregnated with inorganic or organic substances. For inorganic impregnation, alumina sol, chromium oxide sol, zirconium oxide sol, spinel sol, silica sol, or a composite inorganic sol of two or more of the above is used. Preferably, the composite inorganic sol is an alumina-chromium oxide composite sol, or a chromium oxide-oxygen... Zirconia composite sol or magnesium aluminum spinel sol, wherein the mass ratio of chromium oxide to zirconium oxide in the chromium oxide-zirconia composite sol is (1-2):(2-4); the reinforced impact plate is impregnated with alumina-chromium oxide composite sol and then subjected to infinite solid solution of chromium oxide and alumina at high temperature to form spinel chromium corundum; organic impregnation uses one or more of asphalt, tar, anthracite or resin, wherein the resin is epoxy resin or phenolic resin; the reinforced impact plate 7 described in this embodiment is manufactured using a floating worktable.

[0055] During the preparation of the reinforced impact plate 7 and / or the diverter block 10, toughening nanoparticles are added to strengthen their microstructure. The amount of toughening nanoparticles used is 0-3% of the mass of the reinforced impact plate 7 and / or the diverter block 10. The particle size of the toughening nanoparticles is less than or equal to 100 nanometers. The toughening nanoparticles are selected from magnesium oxide powder, α-alumina powder, zirconium dioxide powder, or silicon dioxide powder. The particle size of α-alumina powder is greater than 0 and less than or equal to 30 nanometers, which improves the toughness of the reinforced impact plate 7 and the diverter block 10 by more than 40%.

[0056] The reinforced impact plate 7 is manufactured by introducing ultrafine powder to fill the pores and adding nanoparticles to strengthen its microstructure. The amount of nanoparticles added is 0-3 wt.%, and the particle size of the nanoparticles is greater than 0 nanometers and less than or equal to 100 nanometers. The nanoparticles are chromium oxide powder, aluminum oxide powder, magnesium oxide powder, zirconium dioxide powder, or silicon dioxide powder. After being formed by the manufacturing equipment, the reinforced impact plate 7 undergoes impregnation strengthening. This can be achieved by placing the reinforced impact plate 7 in a vacuum environment for impregnation strengthening, placing the reinforced impact plate in a vacuum environment for impregnation followed by pressure strengthening, or heating the reinforced impact plate and then placing it in a vacuum environment for impregnation followed by pressure strengthening. The reinforced impact plate 7 is formed using a floating worktable for pressure forming. Impregnation strengthening can be achieved using inorganic materials such as alumina sol, chromium oxide sol, zirconium oxide sol, or silicon dioxide sol; or it can be achieved using organic materials such as asphalt impregnation, tar impregnation, anthracite impregnation, resin impregnation, epoxy resin impregnation, or phenolic resin impregnation. It can reduce the porosity of the impact plate 7, improve its strength and thermal shock resistance, and increase its service life.

[0057] The diverting blocks 10 are distributed diffusely towards the inner bottom wall of the stabilizer 1 with the reinforced impact plate 7 as the center; there is a gap between the outermost diverting block 10 and the inner vertical wall of the stabilizer 1, and a protrusion 11 is provided on the inner vertical wall of the stabilizer 1.

[0058] like Figure 1 As shown, an edge diversion layer 8 is provided on the inner bottom wall of the flow stabilizer 1 near the inner vertical wall. The thickness of the edge diversion layer 8 gradually decreases in the direction from the outside of the flow stabilizer 1 to the center of the flow stabilizer 1, and the slope ratio of the edge diversion layer 8 is less than 1:1.25.

[0059] like Figure 6-7 As shown, the edge diversion layer 8 includes two or more central fixing plates 81 and support columns 82. Support columns 82 are vertically fixed to the four corners of each central fixing plate 81. A through hole 83 is formed in the center of each central fixing plate 81. A groove 84 is formed on the side wall of each central fixing plate 81 between two adjacent support columns 82. The support columns 82 on adjacent central fixing plates 81 are connected to each other in close contact. The direction of the support columns 82 intersects the bottom wall of the flow stabilizer 1. The support columns 82 are in contact with the inner bottom wall of the flow stabilizer 1. Multiple central fixing plates 81 are arranged and gradually extend towards the inner vertical wall of the flow stabilizer 1 until they connect with the inner vertical wall. In actual use, two or more layers of central fixing plates 81 can be stacked. By setting an inclined edge diversion layer 8, the molten steel flows towards the edge diversion layer 8 after impacting the diversion layer 3. The protruding support column 82 can disperse the steel flow. At the same time, the inclined state can increase the contact area with the steel flow and facilitate the passage of molten steel through the through hole 83 and groove 84, reducing the impact force on the edge of the stabilizer.

[0060] In this embodiment, as Figure 9As shown, the flow stabilizer 1 includes a base plate 12, a U-shaped inner frame 13, and a U-shaped outer frame 17. Both the inner and outer frames are mounted on the base plate 12. One end of the inner frame 13 has a first opening 21, and one end of the outer frame 17 has a second opening 22. The end of the inner frame 13 with the first opening 21 is inserted into the outer frame 17 through the second opening 22. A first steel flow channel 23 is formed between the sidewall of the outer frame 17 and the sidewall of the inner frame 13. A steel flow hole 24 is provided on the sidewall of the inner frame 13. The steel hole 24 is in fluid communication with the first steel flow channel 23. A second steel flow channel 25 is located between one end of the U-shaped inner frame 13 with the first opening 21 and the facade of the U-shaped outer frame 17. The second steel flow channel 25 is in fluid communication with the first steel flow channel 23. Specifically, the U-shaped inner frame 13 includes a first inner sidewall 14, a second inner sidewall 15, and a third inner sidewall 16. The first inner sidewall 14 and the second inner sidewall 15 are two opposing sidewalls. The third inner sidewall 16 is sealed to the first end of the first inner sidewall 14 and the first end of the second inner sidewall 15, respectively. The first opening 21 is located at... Between the second end of the first inner sidewall 14 and the second end of the second inner sidewall 15; the U-shaped outer frame 17 includes a first outer sidewall 18, a second outer sidewall 19, and a third outer sidewall 20, the first outer sidewall 18 and the second outer sidewall 19 being two opposing sidewalls, the third outer sidewall 20 being sealed to the first end of the first outer sidewall 18 and the first end of the second outer sidewall 19 respectively, and the second opening 22 being located between the second end of the first outer sidewall 18 and the second outer sidewall 19; between the first inner sidewall 14 and the first outer sidewall 18 and / or between the second inner sidewall 15 and... The first steel flow channel 23 is formed between the second outer sidewalls 19. The steel flow hole 24 is provided on the first inner sidewall 14 and / or the second inner sidewall 15. On a plane perpendicular to the direction of steel flow in the first steel flow channel 23, the angle between the axis of the steel flow hole 24 and the horizontal line is 15-25°. On a top view plane passing through the steel flow hole 24, the axis of the steel flow hole 24 is perpendicular to the direction of steel flow in the first steel flow channel 23. The second steel flow channel 25 is provided between the second end of the second inner sidewall 15 and / or the second end of the first inner sidewall 14 and the third outer sidewall 20.The tops of the first inner sidewall 14, the second inner sidewall 15, and the third inner sidewall 16 are all provided with interconnected protruding edges 26 extending toward the U-shaped inner frame 13. The portion of the third outer sidewall 20 located between the first inner sidewall 14 and the second inner sidewall 15 is also provided with a protruding edge 26 extending toward the third inner sidewall 16. The two ends of the protruding edge 26 on the third outer sidewall 20 are respectively connected to the protruding edges 26 on the first inner sidewall 14 and the second inner sidewall 15.

[0061] A double-wall structure was adopted, changing the single wall surface into two stacked walls. This design not only opens up two parallel primary flow field improvement channels, but also improves the flow field and enhances the flow performance of molten steel by optimizing hydrodynamics. In addition, by reducing the dead zone volume inside the flow stabilizer, it effectively promotes the flotation of inclusions in the molten steel, while reducing the impact of molten steel, further extending the service life of the tundish system.

[0062] The tops of the first inner wall 14 and the second outer wall 15 are gradually inclined from the third inner wall 16 to the third outer wall 20. The tops of the first outer wall 31 and the second outer wall 32 are flush with the top of the first inner wall 21. The height of the third inner wall 16 is greater than the height of the third outer wall 20.

[0063] Example 2

[0064] The long-life molten metal transport system in this embodiment differs from that in Embodiment 1 in that, as... Figure 4 The diagram shows a twisted I-shaped diverter block (the twisted I-shaped diverter block is formed by rotating one horizontal stroke of the character "I" by 90 degrees around the vertical stroke of the character "I"). The diverter block 10 has protruding portions 101 at both ends, which are perpendicular to each other. In other embodiments, the protruding portions 101 at both ends of the diverter block 10 can also be parallel to each other. Of course, this embodiment can also use... Figure 11 The I-shaped shunt block shown.

[0065] Example 3

[0066] The long-life molten metal transport system in this embodiment differs from that in Embodiment 1 in that, as... Figure 5 As shown, the surface of the diverter block 10 has outwardly protruding portions 101 arranged in a radiating pattern in the spatial direction. As a special case, it is also possible to use... Figure 12 The four-column radial diversion block shown includes a central connecting block and four cylinders or frustums, one end of each cylinder or frustum being fixed to the central connecting block and the other end being away from the central connecting block and extending in different directions.

[0067] Example 4

[0068] The long-life molten metal transport system in this embodiment differs from that in Embodiment 1 in that, as... Figure 8 As shown, the diversion block 10 is in the shape of a triangular pyramid, with each corner of the diversion block 10 forming an outward protrusion 101, and each corner of the diversion block 10 is provided with a cut-out plane.

[0069] Example 5

[0070] The long-life molten metal transport system in this embodiment differs from that in Embodiment 1 in that the diverter block can also be used as follows: Figure 6 Or such as Figure 14 The four-legged hollow column diverter block shown includes a plate-shaped body, four frustums or prisms fixed to one surface of the plate-shaped body, and four frustums fixed to another surface of the plate-shaped body. The free end of each frustum or prism extends in a direction away from the plate-shaped body, and a through hole penetrating the plate surface is opened in the center of the plate-shaped body.

[0071] Example 6

[0072] The long-life molten metal transport system in this embodiment differs from that in Embodiment 1 in that the diverter block can also be used as follows: Figure 15 The chamfered-corner, chamfered-edge, cone-shaped cubic diverter block shown is a cube with four corners cut off, edges cut parallel to each edge, and a frustum hole opened on each face. The frustum holes on opposite faces are connected to the fluid through the small end, and the large end of the frustum hole is on the surface of the cube.

[0073] Example 7

[0074] The long-life tundish molten metal transfer system in this embodiment is different from that in Embodiment 1 in that the flow splitting blocks are combined by a twisted I-shaped flow splitting block, a twisted king-shaped flow splitting block, a four-column radial flow splitting block and a chamfered and beveled pyramid hole cubic flow splitting block according to a number ratio of 3:5:2:1. Specifically: the chamfered and beveled pyramid hole cubic flow splitting block is arranged in the bottom layer, and the twisted I-shaped flow splitting block, the twisted king-shaped flow splitting block and the four-column radial flow splitting block are mixed and placed in the upper layer; the twisted I-shaped flow splitting block is formed by rotating one horizontal bar of the I-shaped by 90 degrees with one vertical bar of the I-shaped as the rotation axis; the twisted king-shaped flow splitting block is formed by rotating the middle horizontal bar of the king-shaped by 90 degrees with one vertical bar of the king-shaped as the rotation axis; the four-column radial flow splitting block includes a central connecting block and four frustum cones, and the large head end of each frustum cone is fixedly connected to the central connecting block, and the small head end deviates from the central connecting block and extends in different directions; the chamfered and beveled pyramid hole cubic flow splitting block is a cube with four corners cut off, each edge cut off parallel to each edge, and a frustum cone hole is opened on each surface, and the frustum cone holes on the opposite surfaces are fluid-conducted through the small head ends. The combination method of the flow splitting blocks in this embodiment can not only achieve the purpose of "large impact and large flow splitting, small impact and fine flow splitting" of molten steel, but also prevent molten steel from splashing and effectively promote the floating of small-particle inclusions; this is because: the twisted I-shaped flow splitting block, the twisted king-shaped flow splitting block and the four-column radial flow splitting block are mixed and placed in the upper layer, and the flow splitting channels formed between the flow splitting blocks have the characteristics of large cross-sectional area and high connectivity in all directions, so that the molten steel with a large impact force entering the flow stabilizer can quickly "release the force" and become molten steel with a smaller impact force. These molten steel with a smaller impact force flow downward to the chamfered and beveled pyramid hole cubic flow splitting block, the large head end of the frustum cone hole is located on the surface, and the frustum cone holes on the opposite surfaces are fluid-conducted through the small head ends, so that the diversion and throttling of molten steel can be realized, and the molten steel with a smaller impact force can be dispersed into trickles.

Claims

1. A tundish anti-impact system, comprising a flow stabilizer (1) and a protective pipe (2), wherein the outlet end of the protective pipe (2) is disposed facing the molten steel inlet of the flow stabilizer (1), and molten steel flows into the flow stabilizer (1) through the protective pipe (2), characterized in that, The flow stabilizer (1) is provided with a flow divider layer (3), and the flow divider layer (3) has a flow divider channel (4). One end of the flow divider channel (4) is set facing the direction of the molten steel impact, and the other end of the flow divider channel (4) extends out from the flow divider layer (3) and is in fluid communication with the internal space of the flow stabilizer (1). After the steel flow impacts the flow divider layer (3), it enters the flow divider channel (4) and is dispersed into multiple steel flows. The protective tube (2) has at least one steel outlet (9) on the side or bottom. The total number of the steel outlets (9) on the side and the steel outlets (9) on the bottom is greater than or equal to 2. The equivalent circle diameter of the total area of ​​the steel outlets (9) on the side and the steel outlets (9) on the bottom is 20-400 mm.

2. The mid-pack impact protection system according to claim 1, characterized in that, The diversion channel (4) includes a vertical channel (5) arranged along the height direction of the diversion layer (3). One end of the vertical channel (5) faces the direction of the molten steel impact, and the other end of the vertical channel (5) extends toward the bottom of the flow stabilizer (1) and is in fluid communication with the internal space of the flow stabilizer (1). Alternatively, the diversion channel (4) includes a vertical channel (5) arranged along the height direction of the diversion layer (3), one end of the vertical channel (5) facing the direction of the molten steel impact, and the other end of the vertical channel (5) extending toward the bottom of the flow stabilizer (1) and communicating with the fluid inside the flow stabilizer (1); and the diversion channel (4) also includes a horizontal channel (6) arranged along the length and / or width direction of the diversion layer (3), the horizontal channel (6) communicating with the vertical channel (5), and at least one end of the horizontal channel (6) extending out of the diversion layer (3) and communicating with the fluid inside the flow stabilizer (1); Alternatively, the diversion channel (4) may include a curved channel, one end of which faces the direction of the molten steel impact, and the other end of which is in fluid communication with the internal space of the flow stabilizer (1). The diversion layer (3) is a single unit, and the diversion channel (4) is located inside the single unit; Alternatively, the diversion layer (3) may be composed of multiple monomers, and the diversion channel (4) may include gaps formed between adjacent monomers and / or fluid channels formed inside the monomers.

3. A mid-pack impact protection system according to any one of claims 1-2, characterized in that, The diversion layer (3) includes two or more cooperating diversion blocks (10), the diversion blocks (10) are disposed on the inner bottom wall of the flow stabilizer (1); the surface of the diversion block (10) has an outwardly extending protrusion (101), two adjacent diversion blocks (10) are connected to each other through the protrusion (101), and the gap formed by the support of two adjacent diversion blocks (10) through the protrusion (101) is the diversion channel (4); Alternatively, the diversion layer (3) may include two or more diversion blocks (10) that cooperate with each other. The diversion blocks (10) are disposed on the inner bottom wall of the flow stabilizer (1). The surface of the diversion block (10) has an outwardly extending protrusion (101), and the gap formed between two adjacent diversion blocks (10) is the diversion channel (4). The diversion block (10) is an I-shaped diversion block, a twisted I-shaped diversion block, a king-shaped diversion block, a twisted king-shaped diversion block, a four-column radial diversion block, a four-legged hollow column diversion block, a cuboid diversion block with chamfered pyramidal holes, a frustum-shaped diversion block, a conical diversion block, a frustum-shaped diversion block, or a pyramidal diversion block, or any combination thereof; the twisted I-shaped diversion block is formed by rotating one horizontal stroke of the I-shape around the vertical stroke of the I-shape at an angle greater than 0 degrees and less than or equal to 90 degrees; the twisted king-shaped diversion block is formed by rotating the middle horizontal stroke of the king-shape around the vertical stroke of the king-shape at an angle greater than 0 degrees and less than or equal to 90 degrees; the four-column radial diversion block includes a central connecting block. The four-cylinder hollow column diverter includes a plate-shaped body, four frustums or prisms fixed to one surface of the plate-shaped body, and four frustums fixed to another surface of the plate-shaped body. The free end of each frustum or prism extends away from the plate-shaped body. A through hole is opened in the center of the plate-shaped body. The chamfered, edge-cutting, cone-hole cubic diverter is a cube with four corners cut off, edges cut parallel to each edge, and a frustum hole opened on each face. The frustum holes on opposite faces are connected to the fluid through the small end.

4. The mid-pack impact protection system according to claim 3, characterized in that, The flow stabilizer (1) has a reinforced impact plate (7) on its inner bottom wall, and the flow divider (10) is disposed on the surface of the reinforced impact plate (7); the flow divider (10) is distributed diffusely on the inner bottom wall of the flow stabilizer (1) with the reinforced impact plate (7) as the center; there is a gap between the outermost flow divider (10) and the inner vertical wall of the flow stabilizer (1).

5. The mid-pack impact protection system according to claim 4, characterized in that, The reinforced impact plate (7) is an impregnated reinforced impact plate, a vacuum impregnated reinforced impact plate, a reinforced impact plate that is vacuum impregnated and then pressure-reinforced, or a reinforced impact plate that is first heat-treated, then vacuum impregnated, and then pressure-reinforced; it is impregnated with inorganic or organic substances, and the inorganic impregnation uses alumina sol, chromium oxide sol, zirconium oxide sol, spinel sol, silica sol, or a composite inorganic sol of two or more of the above; the composite inorganic sol is an alumina-chromium oxide composite sol, chromium oxide-... Zirconia composite sol or magnesium aluminum spinel sol, the mass ratio of chromium oxide to zirconium oxide in chromium oxide-zirconia composite sol is 1-2:2-4; the reinforced impact plate (7) is impregnated with alumina-chromium oxide composite sol and then chromium oxide and alumina are infinitely dissolved at high temperature to form spinel chromium corundum; organic impregnation uses one or two or more of asphalt, tar, tar oil or resin, the resin is epoxy resin or phenolic resin; the reinforced impact plate (7) is processed and manufactured using a floating worktable. During the preparation of the reinforced impact plate (7) and / or the diverter block (10), toughening nanoparticles are added to strengthen their microstructure. The amount of toughening nanoparticles is 0-3% of the mass of the reinforced impact plate (7) and / or the diverter block (10). The particle size of the toughening nanoparticles is less than or equal to 100 nanometers. The toughening nanoparticles are selected from magnesium oxide powder, α-alumina powder, zirconium dioxide powder or silicon dioxide powder. The particle size of α-alumina powder is greater than 0 and less than or equal to 30 nanometers, which improves the toughness of the reinforced impact plate (7) and the diverter block (10) by more than 40%.

6. A mid-pack impact protection system according to any one of claims 1-2, characterized in that, The inner wall of the stabilizer (1) is provided with a protrusion (11); the side wall of the protective tube (2) is provided with at least one side wall outlet (9).

7. The mid-pack impact protection system according to claim 3, characterized in that, An edge diversion layer (8) is provided on the inner bottom wall of the stabilizer (1) near the inner vertical wall. The thickness of the edge diversion layer (8) gradually decreases in the direction from the outside of the stabilizer (1) to the center of the stabilizer (1), and the slope ratio of the edge diversion layer (8) is less than 1:1.

25.

8. The mid-pack impact protection system according to claim 7, characterized in that, The edge diversion layer (8) includes two or more central fixing plates (81) and support columns (82). Support columns (82) are vertically fixed to the four corners of the central fixing plate (81). A through hole (83) is opened in the center of the central fixing plate (81). A groove (84) is opened on the side wall of the central fixing plate (81) between two adjacent support columns (82). The support columns (82) on the two adjacent central fixing plates (81) are connected to each other. The direction of the support column (82) intersects with the bottom wall of the flow stabilizer (1).

9. The mid-pack impact protection system according to claim 1, characterized in that, The current stabilizer (1) includes a base plate (12), a U-shaped inner frame (13), and a U-shaped outer frame (17). Both the U-shaped inner frame (13) and the U-shaped outer frame (17) are mounted on the base plate (12). One end of the U-shaped inner frame (13) has a first opening (21), and one end of the U-shaped outer frame (17) has a second opening (22). The end of the U-shaped inner frame (13) with the first opening (21) is inserted into the U-shaped outer frame (17) through the second opening (22). A first steel flow channel (23) is formed between the side wall of the outer frame (17) and the side wall of the inner frame (13). A steel flow hole (24) is provided on the side wall of the inner frame (13). The steel flow hole (24) is in fluid communication with the first steel flow channel (23). A second steel flow channel (25) is formed between the end of the inner frame (13) with the first opening (21) and the facade of the outer frame (17). The second steel flow channel (25) is in fluid communication with the first steel flow channel (23).

10. A mid-pack impact protection system according to claim 9, characterized in that, The U-shaped inner frame (13) includes a first inner sidewall (14), a second inner sidewall (15), and a third inner sidewall (16). The first inner sidewall (14) and the second inner sidewall (15) are two opposing sidewalls. The third inner sidewall (16) is sealed to the first end of the first inner sidewall (14) and the first end of the second inner sidewall (15), respectively. The first opening (21) is located between the second end of the first inner sidewall (14) and the second end of the second inner sidewall (15). The U-shaped outer frame (17) includes a first outer sidewall (18), a second outer sidewall (19), and a third outer sidewall (10). The wall (20), the first outer wall (18) and the second outer wall (19) are two opposing side walls, the third outer wall (20) is sealed to the first end of the first outer wall (18) and the first end of the second outer wall (19) respectively, the second opening (22) is located between the second end of the first outer wall (18) and the second end of the second outer wall (19); the first inner wall (14) and the first outer wall (18) and / or the second inner wall (15) and the second outer wall (19) form the first steel flow channel (23), the first The inner wall (14) and / or the second inner wall (15) are provided with the steel flow hole (24). On a plane perpendicular to the direction of molten steel flow in the first steel flow channel (23): the angle between the axis of the steel flow hole (24) and the horizontal line is 15-25°; on a top view plane passing through the steel flow hole (24): the axis of the steel flow hole (24) is perpendicular to the direction of molten steel flow in the first steel flow channel (23); the second end of the second inner wall (15) and / or the second end of the first inner wall (14) and the third outer wall (20) form the second steel flow channel (25). The top of the first inner sidewall (14), the second inner sidewall (15) and the third inner sidewall (16) are provided with protruding edges (26) that are connected to each other and extend into the U-shaped inner frame (13). The third outer sidewall (20) located between the first inner sidewall (14) and the second inner sidewall (15) is provided with a protruding edge (26) that extends toward the third inner sidewall (16). The two ends of the protruding edge (26) on the third outer sidewall (20) are connected to the protruding edge (26) on the first inner sidewall (14) and the protruding edge (26) on the second inner sidewall (15) respectively.

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