Converter tapping hole mounting structure and manufacturing method thereof

Abstract

The invention relates to the technical field of iron and steel smelting, and discloses a converter tapping hole mounting structure which comprises a long pipe, a furnace brick assembly, a blowing assembly and a fixing assembly. The converter tapping hole installation structure is installed in a converter lining, when molten steel is poured out, the long pipe and the fixing assembly are melted at the high temperature of the molten steel, and a channel for pouring out the molten steel is jointly formed by the bowl brick and the multiple flowing bricks; blowing gas is sprayed out through the gas inlet pipe, the gas distribution pipe and the gas blowing pipe in sequence and is sprayed to the position behind the flowing brick located at the rearmost end, namely, the position behind the flowing brick located at the rearmost end, in the molten steel, so that vortexes generated by the molten steel during tapping are destroyed, slag entrapment of the molten steel is reduced, slag is blown away, the slag and the steel are thoroughly separated, and the subsequent steelmaking effect is guaranteed. The invention further discloses a manufacturing method of the converter tapping hole mounting structure, the bowl bricks and the flow bricks are subjected to isostatic pressing forming and then are mounted and combined, the overall compactness of the bowl brick assembly is improved, and the service life of the bowl brick assembly is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of steel smelting, and particularly to a mounting structure for a converter tapping hole and a manufacturing method thereof. Background Art

[0002] In converter steelmaking, supersonic oxygen lances are used to blow oxygen into molten iron, oxidizing elements such as carbon, silicon, manganese, and phosphorus in the molten iron and entering the slag. Carbon oxides usually enter the flue in the form of CO or CO2. The oxidizing slag formed by the oxidation of elements such as silicon, manganese, and phosphorus will deteriorate the refining and affect the steelmaking effect. Therefore, when tapping the converter, it is necessary to block the slag to prevent it from entering the ladle and affecting the subsequent steelmaking effect.

[0003] Common slag blocking technologies for tapping mainly include: slag blocking marks (balls) and slide plate slag blocking; the method of slag blocking marks is simple and low-cost, but the success rate is not high; the sliding baffle has good slag blocking effect, but requires a large amount of maintenance and high cost. In order to achieve slag-steel separation and keep the slag in the converter without flowing into the ladle with the molten steel, a mounting structure for a converter tapping hole has been proposed in the steelmaking industry. It plans to set an air injection pipe, a distribution pipe, and an intake pipe at the tapping hole, and by controlling the flow rate and pressure of gas injection, destroy the vortex generated by the molten steel during tapping, thereby reducing the slag entrainment in the molten steel. At the same time, the slag above the tapping hole is blown away to completely separate the slag from the steel, thus avoiding the slag flowing into the ladle with the molten steel and affecting the subsequent steelmaking effect.

[0004] However, in the existing mounting structures for converter tapping holes, the gas ejection positions are all set on the inner wall of the tapping hole, and the gas is usually blown along the radial direction of the tapping hole. However, when tapping, the molten steel rushes out at high speed from top to bottom, and the blown gas will rush out of the tapping hole together with the molten steel, making it difficult to destroy the vortex and thus achieve the purpose of preventing slag entrainment and slag-steel separation. Moreover, such mounting structures for converter tapping holes are usually made by integral isostatic pressing, with poor density and low service life. Summary of the Invention

[0005] The purpose of the present invention is to provide a mounting structure for a converter tapping hole and a manufacturing method thereof, to solve the problem that it is difficult to prevent slag entrainment and slag-steel separation by blowing gas at the existing converter tapping holes; and to solve the problems of poor density and low service life caused by the integral manufacturing of the converter tapping hole.

[0006] To achieve the above purpose, the present invention provides a mounting structure for a converter tapping hole. Define the direction parallel to the flow of molten steel as the first direction, and the end where the molten steel first flows through is the rear end, and the end where the molten steel then flows through is the front end. It includes a long tube, a furnace brick assembly, a gas blowing assembly, and a fixing assembly;

[0007] The long tube extends along the first direction; the long tube is made of steel;

[0008] The furnace brick assembly includes a bowl brick and multiple flow bricks; both the bowl brick and the multiple flow bricks are hollow and open at both ends; the bowl brick and the multiple flow bricks are sequentially sleeved on the outer periphery of the long tube along the first direction, and the bowl brick is located at the front end in the first direction; both the bowl brick and the flow bricks are made of refractory materials;

[0009] The air blowing assembly includes a gas distribution pipe, an air inlet pipe, and a blowing pipe; the gas distribution pipe is buried in the rear part of the bowl brick, and an air inlet hole and multiple air outlet holes are respectively opened at the front and rear ends of the gas distribution pipe; the air inlet pipe passes through the bowl brick and is communicated with the air inlet hole; the blowing pipe extends along the first direction and sequentially passes through multiple flow bricks, the blowing pipe has a first end and a second end, the first end is communicated with the air outlet hole, and the second end extends to the rear of the flow brick at the last end; the air blowing assembly is made of steel;

[0010] The fixing assembly is arranged at the front end and the rear end of the long tube and is used to fix the relative position of the furnace brick assembly and the long tube in the first direction; the fixing assembly is made of steel.

[0011] Further, the profile of the rear end face of the flow brick is stepped with the outer part higher and the inner part lower along the radial direction;

[0012] The profile of the front end face of the flow brick is stepped with the outer part lower and the inner part higher along the radial direction; and it matches the profile of the rear end face of the flow brick.

[0013] Further, the air blowing assembly further includes a connecting pipe;

[0014] The connecting pipe includes a connecting part and an extending part that are sequentially communicated, and the connecting part is also communicated with the end of the air inlet pipe away from the gas distribution pipe; the extending part extends outward parallel to the radial direction of the long tube.

[0015] Further, the second end of the blowing pipe extends to the rear end opening of the long tube and is bent to point to the inner side wall of the long tube.

[0016] Further, 2 to 12 air outlet holes are evenly spaced along the circumferential direction at the rear end of the gas distribution pipe; multiple blowing pipes are evenly spaced along the circumferential direction and are respectively connected to the air outlet holes one by one.

[0017] The present invention also provides a manufacturing method for the above-mentioned tapping hole installation structure of a converter, which includes the following steps:

[0018] S1. Respectively open an air inlet hole and an air outlet hole at the front and rear ends of the gas distribution pipe, fixedly connect the air inlet pipe to the gas distribution pipe, and make the air inlet pipe communicate with the air inlet hole;

[0019] S2. Place the gas distribution pipe and the intake pipe into the mold of the bowl-shaped brick together, fill the mold of the bowl-shaped brick with refractory material, and fabricate the bowl-shaped brick with the gas distribution pipe and the intake pipe through isostatic pressing process;

[0020] S3. Fix multiple blowing pipes to the gas distribution pipe, and make the blowing pipes communicate with the air outlet holes;

[0021] S4. Fabricate multiple flow bricks through isostatic pressing process, and make each of the multiple flow bricks have a channel for the blowing pipe to pass through;

[0022] S5. Insert multiple flow bricks into the blowing pipe in sequence from the second end;

[0023] S6. Install the fixing components at the front and rear ends of the long pipe to fix the relative positions of the bowl-shaped brick and multiple flow bricks with the long pipe in the first direction.

[0024] Further, the specific steps of fabricating multiple flow bricks through isostatic pressing process and making each of the multiple flow bricks have a channel for the blowing pipe to pass through in step S4 include:

[0025] S4-1. Fabricate a flow brick mold matching the flow brick;

[0026] S4-2. Fill the flow brick mold with refractory material, and compact the refractory material into a mold through isostatic pressing;

[0027] S4-3. Take out the flow brick from the flow brick mold.

[0028] Further, the specific steps of fabricating a flow brick mold matching the flow brick in step S4-1 include:

[0029] S4-1-1. Fabricate an outer pipe mold; make the outer pipe mold tubular, and make the inner diameter of the outer pipe mold the same as the outer diameter of the flow brick;

[0030] S4-1-2. Fabricate an inner pipe mold; make the inner pipe mold include an inner pipe part and a bottom extrusion part connected from top to bottom; make the outer peripheral shape of the inner pipe part match the inner shape of the flow brick; make the outer diameter of the bottom extrusion part the same as the inner diameter of the outer pipe mold, and make the upper surface shape of the bottom extrusion part match the rear end face of the flow brick;

[0031] And open positioning holes on the upper surface of the bottom extrusion part according to the quantity and distribution positions of multiple blowing pipes;

[0032] S4-1-3. Fabricate an extrusion plate; open a through hole for sleeving the inner pipe part in the middle of the extrusion plate;

[0033] S4-1-4. Connect positioning rods with the same outer diameter as the blowing pipes to the bottom of the extrusion plate according to the quantity and distribution positions of the multiple blowing pipes.

[0034] S4-1-5. Fabricate an extrusion die; open a through hole in the middle of the extrusion die for sleeving the inner pipe portion; make the shape of the lower surface of the extrusion die match the front end face of the flow brick; and open a through hole in the extrusion die for the positioning rods to pass through.

[0035] S4-1-6. Place the inner pipe die vertically into the outer pipe die, then sequentially sleeve the extrusion die and the extrusion plate onto the inner pipe portion, and insert the positioning rods into the positioning holes one by one to fabricate the flow brick die.

[0036] Further, the specific steps of taking out the flow brick from the flow brick die in step S4-3 include:

[0037] S4-3-1. While pressing the extrusion die tightly, pull out the extrusion plate together with the positioning rods upward from the flow brick.

[0038] S4-3-2. Take out the extrusion die from the inner pipe portion.

[0039] S4-3-3. Move the inner pipe die upward relative to the outer pipe die to eject the flow brick.

[0040] Further, the specific steps of putting the gas distribution pipe and the air inlet pipe into the die of the bowl brick together, filling the die of the bowl brick with refractory material, and fabricating the bowl brick with the gas distribution pipe and the air inlet pipe through the isostatic pressing process in step S2 include:

[0041] S2-1. Put the gas distribution pipe and the air inlet pipe into the die of the bowl brick together; and make the air inlet pipe fit against the inner side wall of the die of the bowl brick, and the gas distribution pipe fit against the inner bottom side wall of the die of the bowl brick.

[0042] S2-2. Fill the die of the bowl brick with refractory material, and fabricate the bowl brick with the gas distribution pipe and the air inlet pipe through the isostatic pressing process.

[0043] Compared with the prior art, the beneficial effects of an installation structure of a converter tapping hole and a manufacturing method thereof provided by the present invention are as follows:

[0044] An installation structure for a converter tapping hole provided by the present invention includes a long pipe, a furnace brick assembly, a blowing assembly, and a fixing assembly; the installation structure of the converter tapping hole is installed in the lining of the converter according to the flowing direction of molten steel; when the converter tilts out molten steel, the long pipe and the fixing assembly made of steel and not wrapped by the furnace brick assembly will be melted by the high-temperature molten steel when contacting the molten steel, but the furnace brick assembly made of refractory material remains in its original state and forms a channel for the molten steel to flow through in the middle, thereby realizing the tapping of the converter; the gas distribution pipe, the inlet pipe, and the blowing pipe buried in the furnace brick assembly remain in their original states, and the first end of the blowing pipe and the part buried in the flowing brick are also retained. Thus, the blown gas passes through the inlet pipe, the gas distribution pipe, and the blowing pipe in sequence and is directly sprayed behind the flowing brick at the rearmost end, that is, into the molten steel in the converter, destroying the vortex generated by the molten steel during tapping, thereby reducing the slag entrainment of the molten steel. At the same time, the slag above the tapping hole is blown away, enabling the complete separation of slag and steel, thereby preventing the slag from flowing into the ladle along with the molten steel and affecting the subsequent steelmaking effect.

[0045] The present invention also provides a manufacturing method for the above-mentioned installation structure of the converter tapping hole. The bowl brick and multiple flowing bricks in the furnace brick assembly are respectively processed and formed by an isostatic pressing process, and then installed and combined to form an integrated converter tapping hole structure. Compared with integrally isostatically pressing and forming the furnace brick assembly made of refractory material, the manufacturing method of the present invention can make the bowl brick and multiple flowing bricks have better density, so that the overall density of the furnace brick assembly is better, thereby improving its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a schematic cross-sectional structure diagram of an installation structure of a converter tapping hole according to an embodiment of the present invention;

[0047] Figure 2 is a top view schematic diagram of a gas distribution pipe in an installation structure of a converter tapping hole according to an embodiment of the present invention;

[0048] Figure 3 is Figure 1 an enlarged schematic diagram of area A in

[0049] Figure 4 is Figure 1 an enlarged schematic diagram of area B in

[0050] Figure 5 is a schematic cross-sectional structure diagram of a flowing brick in an installation structure of a converter tapping hole according to an embodiment of the present invention;

[0051] Figure 6 is a schematic flow diagram of a manufacturing method according to an embodiment of the present invention;

[0052] Figure 7It is a schematic cross-sectional structure diagram of a flow brick mold in a manufacturing method according to an embodiment of the present invention.

[0053] In the figure, 100 is a converter tapping port installation structure; 1 is a long tube; 2 is a furnace brick assembly; 21 is a bowl brick; 22 is a flow brick; 3 is a blowing assembly; 31 is a gas distribution pipe; 311 is an air inlet hole; 312 is an air outlet hole; 32 is an air inlet pipe; 33 is a blowing pipe; 331 is a first end; 332 is a second end; 34 is a connecting pipe; 341 is a connecting portion; 342 is an extending portion; 4 is a fixing assembly; 41 is a front fixing portion; 411 is a first pressing plate; 412 is a fixing member; 413 is a fastening member; 42 is a rear fixing portion; 421 is a second pressing plate; 422 is an outer pipe; 200 is a flow brick mold; 201 is an outer pipe mold; 202 is an inner pipe mold; 2021 is an inner pipe portion; 2022 is a bottom extrusion portion; 20220 is a positioning hole; 203 is an extrusion plate; 204 is a positioning rod; 205 is an extrusion mold; 2050 is a pressing groove; 206 is a pressing rod. Detailed implementation manners

[0054] The following will further describe in detail the specific implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0055] As Figures 1 to 5 shown, a converter tapping port installation structure 100 according to an embodiment of the present invention defines the direction parallel to the molten steel flow as the first direction X, and the end where the molten steel first flows through is the rear end, and the end where the molten steel then flows through is the front end. It includes a long tube 1, a furnace brick assembly 2, a blowing assembly 3, and a fixing assembly 4; the long tube 1 extends along the first direction X; the long tube 1 is made of steel;

[0056] The furnace brick assembly 2 includes a bowl brick 21 and multiple flow bricks 22; both the bowl brick 21 and the multiple flow bricks 22 are hollow and open at both ends; the bowl brick 21 and the multiple flow bricks 22 are sequentially sleeved on the outer periphery of the long tube 1 along the first direction X, and the bowl brick 21 is located at the front end in the first direction; both the bowl brick 21 and the flow bricks 22 are made of refractory materials;

[0057] The blowing component 3 includes a gas distribution pipe 31, an air inlet pipe 32, and a blowing pipe 33. The gas distribution pipe 31 is buried in the rear part of the bowl brick 21, and air inlet holes 311 and a plurality of air outlet holes 312 are respectively formed at the front and rear ends of the gas distribution pipe 31. The air inlet pipe 32 passes through the bowl brick 21 and is communicated with the air inlet hole 311. The blowing pipe 33 extends along the first direction X and sequentially passes through a plurality of flow bricks 22. The blowing pipe 33 has a first end 331 and a second end 332. The first end 331 is communicated with the air outlet hole 312, and the second end 332 extends to the rear of the flow brick 22 at the last end. The blowing component 3 is made of steel.

[0058] The fixing component 4 is arranged at the front end and the rear end of the long pipe 1 and is used for fixing the relative position of the furnace brick component 2 and the long pipe 1 in the first direction X. The fixing component 4 is made of steel.

[0059] Based on the above technical solution, the converter tapping mouth installation structure 100 is installed in the lining of the converter according to the flowing direction of the molten steel. When the converter pours out the molten steel outward, the long pipe 1 and the fixing component 4 made of steel and not wrapped by the furnace brick component 2 will be melted by the high-temperature molten steel when contacting the molten steel, but the furnace brick component 2 made of refractory material remains in its original state and forms a channel for the molten steel to flow through in the middle, so as to realize the tapping of the converter. The gas distribution pipe 31 and the air inlet pipe 32 buried in the furnace brick component 2 remain in their original states, and the first end 331 of the blowing pipe 33 and the part buried in the flow brick 22 are also retained. Thus, the blowing gas sequentially passes through the air inlet pipe 32, the gas distribution pipe 31, and the blowing pipe 33, and is directly sprayed behind the flow brick 22 at the last end, that is, into the molten steel in the converter, destroying the vortex generated by the molten steel during tapping, thereby reducing the slag entrainment of the molten steel. At the same time, the slag above the tapping mouth is blown away, so that the slag and steel are completely separated, thus avoiding the slag flowing into the ladle along with the molten steel and affecting the subsequent steelmaking effect.

[0060] Further, as Figure 1 and Figure 5 shown, to adapt to the flow of the molten steel and prevent the molten steel from flowing out from the outer peripheral wall of the tapping mouth when flowing through the tapping mouth, the profile of the rear end face of the flow brick 22 is stepped with the outer part being higher and the inner part being lower along the radial direction; the profile of the front end face of the flow brick 22 is stepped with the outer part being lower and the inner part being higher along the radial direction; and it matches the profile of the rear end face of the flow brick 22. The matching of the front and rear end face profiles of the flow brick 22 enables the plurality of flow bricks 22 to be attached to each other when connected in sequence, preventing the molten steel from leaking through the connection gap.

[0061] Further, as Figure 1 and Figure 4As shown, for facilitating the connection between the intake pipe 32 and an external gas source to supply gas, the blowing assembly 3 further includes a connecting pipe 34; the connecting pipe 34 includes a connecting portion 341 and an extending portion 342 that are connected in sequence, and the connecting portion 341 is connected to one end of the intake pipe 32 away from the gas distribution pipe 31; the extending portion 342 extends outward in parallel with the radial direction of the long pipe 1.

[0062] Further, as Figure 1 and Figure 3 shown, for facilitating the installation and transportation of the tapping opening installation structure 100 of the converter, the second end 332 of the blowing pipe 33 extends to the rear opening of the long pipe 1 and bends to point to the inner side wall of the long pipe 1, preventing problems such as bending of the second end 332 of the blowing pipe 33 caused by being touched by external objects during the installation and transportation process, and further affecting the structure of the flow brick 22.

[0063] Further, as Figure 2 shown, for facilitating the arrangement of the blowing pipe 33 to achieve a better gas blowing effect on the molten steel, 2 to 12 air outlet holes 312 are evenly spaced along the circumference at the rear end of the gas distribution pipe 31; multiple blowing pipes 33 are evenly spaced along the circumference and are respectively connected to the air outlet holes 312.

[0064] Preferably, as Figure 2 shown, 4 air outlet holes 312 are evenly spaced along the circumference at the rear end of the gas distribution pipe 31 in this embodiment to achieve a better jetting effect.

[0065] Preferably, as Figure 1 、 Figure 3 and Figure 4 shown, the fixing assembly 4 includes a front fixing portion 41 and a rear fixing portion 42; the front fixing portion 41 includes a first pressing plate 411, a fixing member 412, and a fastening member 413; the fixing member 412 is fixed in the inner cavity of the long pipe 1; the first pressing plate 411 is pressed in front of the bowl brick 21, and the first pressing plate 411 and the fixing member 412 are connected by the fastening member 413, thereby tightly pressing the first pressing plate 411 in front of the bowl brick 21, thus preventing the furnace brick assembly 2 from moving forward relative to the long pipe 1 during the installation and transportation process and causing separation between the bowl brick 21 and multiple flow bricks 22.

[0066] The rear fixing part 42 includes a second pressing plate 421 and an outer pipe 422. The second pressing plate 421 is fixedly sleeved on the outer periphery of the long pipe 1 and is located behind the last flow brick 22. The outer diameter of the second pressing plate 421 is larger than that of the flow brick 22. The outer pipe 422 is fixedly sleeved on the outer periphery of the long pipe 1 and is located behind the second pressing plate 421, thereby preventing the furnace brick assembly 2 from moving backward relative to the long pipe 1 during installation and transportation, resulting in separation between the bowl brick 21 and multiple flow bricks 22. Thus, the relative position of the furnace brick assembly 2 and the long pipe 1 in the first direction is fixed by the front fixing part 41 and the rear fixing part 42.

[0067] Specifically, in this embodiment, when assembling the converter tapping hole installation structure 100, the outer pipe 422 is sleeved into the long pipe 1 from the rear end and is sleeved on the outer periphery of the long pipe 1. The outer pipe 422 is fixedly connected to the long pipe 1 by welding to cooperate with the front fixing part 41 to fix the relative position of the furnace brick assembly 2 and the long pipe 1 in the first direction X.

[0068] As Figure 6 shown, the present invention also provides a manufacturing method for manufacturing the above-mentioned converter tapping hole installation structure 100, which includes the following steps:

[0069] S1. Open an air inlet hole 311 and an air outlet hole 312 at the front and rear ends of the gas distribution pipe 31 respectively, fixedly connect the inlet pipe 32 to the gas distribution pipe 31, and make the inlet pipe 32 communicate with the air inlet hole 311.

[0070] S2. Put the gas distribution pipe 31 and the inlet pipe 32 together into the mold of the bowl brick 21, fill the mold of the bowl brick 21 with refractory material, and manufacture the bowl brick 21 with the gas distribution pipe 31 and the inlet pipe 32 through an isostatic pressing process.

[0071] S3. Fixedly connect multiple blowing pipes 33 to the gas distribution pipe 31, and make the blowing pipes 33 communicate with the air outlet hole 312.

[0072] S4. Manufacture multiple flow bricks 22 through an isostatic pressing process, and make each of the multiple flow bricks 22 have a channel for the blowing pipe 33 to pass through.

[0073] S5. Insert multiple flow bricks 22 into the blowing pipes 33 in sequence from the second end 332.

[0074] S6. Install the fixing assembly 4 at the front and rear ends of the long pipe 1, and fix the relative position of the bowl brick 21 and multiple flow bricks 22 and the long pipe 1 in the first direction X.

[0075] Based on the above technical solution, the bowl-shaped brick 21 and multiple flow bricks 22 in the furnace brick assembly 2 are respectively processed and formed by isostatic pressing, and then installed and combined to form an integrated tapping hole installation structure 100 for a converter. Compared with integrally isostatically forming the furnace brick assembly 2 made of refractory materials, the manufacturing method of the present invention can make the bowl-shaped brick 21 and the multiple flow bricks 22 have better density, so that the overall density of the furnace brick assembly 2 is better, thereby improving its service life.

[0076] Preferably, in this embodiment, the step of fixedly connecting the air inlet pipe 32 to the gas distribution pipe 31 in step S1 is specifically as follows:

[0077] Weld the air inlet pipe 32 to the gas distribution pipe 31; to ensure the connection effect between the air inlet pipe 32 and the air inlet holes 311, thereby preventing the blown gas from leaking from the connection position and ensuring its effective blowing into the molten steel.

[0078] Similarly, the step of fixedly connecting multiple blowing pipes 33 to the gas distribution pipe 31 in step S3 is specifically as follows:

[0079] Weld multiple blowing pipes 33 to the gas distribution pipe 31.

[0080] Furthermore, to standardize the operation process of manufacturing the flow bricks 22 in step S4, the specific steps of manufacturing multiple flow bricks 22 by isostatic pressing and making each of the multiple flow bricks 22 have a channel for the blowing pipe 33 to pass through in step S4 include:

[0081] S4-1. Manufacture a flow brick mold matching the flow brick 22;

[0082] S4-2. Fill the flow brick mold with refractory material, and compact the refractory material by isostatic pressing;

[0083] S4-3. Take out the flow brick 22 from the flow brick mold.

[0084] Furthermore, as Figure 7 shown, to manufacture a flow brick mold 200 matching the flow brick 22, the specific steps of manufacturing the flow brick mold 200 matching the flow brick 22 in step S4-1 include:

[0085] S4-1-1. Manufacture an outer pipe mold 201; make the outer pipe mold 201 tubular and make the inner diameter of the outer pipe mold 201 the same as the outer diameter of the flow brick 22;

[0086] S4-1-2. Fabricate the inner tube mold 202; Make the inner tube mold 202 include an inner tube part 2021 and a bottom extrusion part 2022 connected from top to bottom; Make the outer peripheral shape of the inner tube part 2021 match the inner shape of the flow brick 22; Make the outer diameter of the bottom extrusion part 2022 the same as the inner diameter of the outer tube mold 201, and make the shape of the upper surface of the bottom extrusion part 2022 match the rear end face of the flow brick 22;

[0087] And drill positioning holes 20220 on the upper surface of the bottom extrusion part 2022 according to the number and distribution positions of the multiple blow pipes 33;

[0088] S4-1-3. Fabricate the extrusion plate 203; Drill a through hole in the middle of the extrusion plate 203 for sleeving the inner tube part 2021;

[0089] S4-1-4. According to the number and distribution positions of the multiple blow pipes 33, connect positioning rods 204 with the same outer diameter as the blow pipes 33 to the bottom of the extrusion plate 203;

[0090] S4-1-5. Fabricate the extrusion mold 205; Drill a through hole in the middle of the extrusion mold 205 for sleeving the inner tube part 2021; Make the shape of the lower surface of the extrusion mold 205 match the front end face of the flow brick 22; And drill a through hole in the extrusion mold 205 for the positioning rod 204 to pass through;

[0091] S4-1-6. Place the inner tube mold 202 vertically into the outer tube mold 201, then sleevethe extrusion mold 205 and the extrusion plate 203 onto the inner tube part 2021 in sequence, and insert the positioning rods 204 into the positioning holes 20220 one by one to fabricate the flow brick mold 200.

[0092] Further, to standardize the operation process of removing the flow brick 22 from the flow brick mold 200 and prevent the positioning rod 204 from being unable to disengage from the flow brick 22 or causing damage to the flow brick 22 during the disengagement process, the specific steps of removing the flow brick 22 from the flow brick mold 200 in step S4-3 include:

[0093] S4-3-1. While pressing the extrusion mold 205, pull out the extrusion plate 203 together with the positioning rod 204 upward from the flow brick 22;

[0094] S4-3-2. Remove the extrusion mold 205 from the inner tube part 2021;

[0095] S4-3-3. Move the inner tube mold 202 upward relative to the outer tube mold 201 to eject the flow brick 22.

[0096] Preferably, as Figure 7 shown, for facilitating the pressing of the extrusion die 205 in step S4-3-1, step S4-1-5 further includes: uniformly and spacedly arranging a plurality of pressing grooves 2050 extending radially on the outer periphery of the extrusion die 205.

[0097] Pressing the extrusion die 205 in step S4-3-1 specifically is:

[0098] Inserting a pressing rod 206 into the pressing groove 2050 to press the extrusion die 205.

[0099] Furthermore, to ensure that the air outlet holes 312 at the rear end of the gas distribution pipe 31 can be exposed outside the bowl brick 21, so that the blowing pipe 33 can be connected to the gas distribution pipe 31; and to keep the inlet pipe 32 as far away from the inner wall of the bowl brick 21 as possible to improve the overall service life of the blowing assembly 3; the specific steps of putting the gas distribution pipe 31 and the inlet pipe 32 into the mold of the bowl brick 21 together in step S2, filling the mold of the bowl brick 21 with refractory materials, and manufacturing the bowl brick 21 with the gas distribution pipe 31 and the inlet pipe 32 through an isostatic pressing process include:

[0100] S2-1, putting the gas distribution pipe 31 and the inlet pipe 32 into the mold of the bowl brick 21 together; and making the inlet pipe 32 fit with the inner side wall of the mold of the bowl brick 21, and making the gas distribution pipe 31 fit with the inner bottom side wall of the mold of the bowl brick 21;

[0101] S2-2, filling the mold of the bowl brick 21 with refractory materials and manufacturing the bowl brick 21 with the gas distribution pipe 31 and the inlet pipe 32 through an isostatic pressing process.

[0102] In summary, the embodiment of the present invention provides a converter tapping hole installation structure 100, which includes a long pipe 1, a furnace brick assembly 2, a blowing assembly 3, and a fixing assembly 4. The converter tapping hole installation structure 100 is installed in the lining of the converter according to the flow direction of the molten steel. When the converter pours the molten steel outwards, the long pipe 1 and the fixing assembly 4 made of steel and not wrapped by the furnace brick assembly 2 will be melted by the high-temperature molten steel when contacting the molten steel, but the furnace brick assembly 2 made of refractory material remains intact and forms a channel for the molten steel to flow through in the middle, thereby realizing the tapping of the converter. The gas distribution pipe 31 and the inlet pipe 32 buried in the furnace brick assembly 2 remain intact, and the first end 331 of the blowing pipe 33 and the part buried in the flow brick 22 are also retained. Thus, the blown gas sequentially passes through the inlet pipe 32, the gas distribution pipe 31, and the blowing pipe 33, and is directly sprayed behind the flow brick 22 at the rearmost end, that is, into the molten steel in the converter, destroying the vortex generated by the molten steel during tapping, thereby reducing the slag entrainment of the molten steel, and at the same time blowing away the slag above the tapping hole, so that the slag and steel are completely separated, thereby preventing the slag from flowing into the ladle with the molten steel and affecting the subsequent steelmaking effect.

[0103] The embodiment of the present invention also provides a manufacturing method for the above-mentioned converter tapping hole installation structure 100. The bowl brick 21 and multiple flow bricks 22 in the furnace brick assembly 2 are respectively processed and formed by an isostatic pressing process, and then installed and combined to form an integrated converter tapping hole installation structure 100. Compared with integrally isostatically pressing and forming the furnace brick assembly 2 made of refractory material, the manufacturing method of the present invention can make the bowl brick 21 and multiple flow bricks 22 have better density, so that the overall density of the furnace brick assembly 2 is better, thereby improving its service life.

[0104] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. An installation structure of a converter tapping hole, defining the direction parallel to the molten steel flow as the first direction, and the end where the molten steel first flows through as the rear end, and the end where the molten steel flows through later as the front end, characterized in that, Comprising: A long tube, the long tube is arranged to extend along the first direction; the long tube is made of steel; A furnace brick assembly, the furnace brick assembly includes a bowl brick and multiple flow bricks; both the bowl brick and the multiple flow bricks are hollow and have openings at both ends; the bowl brick and the multiple flow bricks are sequentially sleeved on the outer periphery of the long tube along the first direction, and the bowl brick is located at the front end in the first direction; both the bowl brick and the flow bricks are made of refractory materials; A blowing assembly, the blowing assembly includes a gas distribution pipe, an air inlet pipe and a blowing pipe; the gas distribution pipe is buried in the rear part of the bowl brick, and air inlet holes and a plurality of air outlet holes are respectively opened at the front and rear ends of the gas distribution pipe; the air inlet pipe penetrates through the bowl brick and is communicated with the air inlet hole; the blowing pipe is arranged to extend along the first direction and sequentially penetrates through multiple flow bricks, the blowing pipe has a first end and a second end, the first end is communicated with the air outlet hole, and the second end extends to the rear of the flow brick located at the last end; the blowing assembly is made of steel; A fixing assembly, the fixing assembly is arranged at the front end and the rear end of the long tube, and is used for fixing the relative position of the furnace brick assembly and the long tube in the first direction; the fixing assembly is made of steel.

2. The installation structure of the converter tapping hole according to claim 1, characterized in that The profile of the rear end face of the flow brick is stepped with the outer part being higher and the inner part being lower along the radial direction; The profile of the front end face of the flow brick is stepped with the outer part being lower and the inner part being higher along the radial direction; and it matches the profile of the rear end face of the flow brick.

3. The installation structure of the converter tapping hole according to claim 1, characterized in that The blowing assembly further includes a connecting pipe; The connecting pipe includes a connecting part and an extending part that are sequentially communicated, and the connecting part is also communicated with one end of the air inlet pipe away from the gas distribution pipe; the extending part extends outward parallel to the radial direction of the long tube.

4. The installation structure of a converter tapping hole according to claim 1, characterized in that, The second end of the blowing pipe extends to the rear end opening of the long tube and is bent to point to the inner side wall of the long tube.

5. The installation structure of a converter tapping hole according to claim 1, characterized in that, 2 to 12 air outlet holes are evenly spaced along the circumferential direction at the rear end of the gas distribution pipe; multiple blowing pipes are evenly spaced along the circumferential direction and are respectively connected to the air outlet holes in one-to-one correspondence.

6. A manufacturing method for manufacturing the converter tapping hole installation structure according to any one of claims 1 to 5, characterized in that, Including the following steps: S1. Respectively open an air inlet hole and an air outlet hole at the front and rear ends of the gas distribution pipe, fixedly connect the air inlet pipe to the gas distribution pipe, and make the air inlet pipe communicate with the air inlet hole; S2. Put the gas distribution pipe and the air inlet pipe together into the mold of the bowl brick, fill the mold of the bowl brick with refractory materials, and manufacture the bowl brick with the gas distribution pipe and the air inlet pipe through an isostatic pressing process; S3. Fixedly connect multiple blowing pipes to the gas distribution pipe, and make the blowing pipes communicate with the air outlet holes; S4. Manufacture multiple flow bricks through an isostatic pressing process, and make each of the multiple flow bricks have a channel for the blowing pipe to pass through; S5. Sequentially insert multiple flow bricks into the blowing pipe from the second end; S6. Install the fixing assembly at the front and rear ends of the long tube, and fix the relative positions of the bowl brick and multiple flow bricks and the long tube in the first direction.

7. The manufacturing method according to claim 6, wherein The specific steps of manufacturing multiple flow bricks through an isostatic pressing process in step S4 and making each of the multiple flow bricks have a channel for the blowing pipe to pass through include: S4-1. Manufacture a flow brick mold matching the flow brick; S4-2. Fill the refractory material into the flowing brick mold, and compact the refractory material by isostatic pressing to form a shape. S4-3. Take out the flowing brick from the flowing brick mold.

8. A manufacturing method as described in claim 7, characterized in that, The specific steps of manufacturing the flowing brick mold matching the flowing brick in step S4-1 include: S4-1-1. Manufacture the outer tube mold; make the outer tube mold tubular, and make the inner diameter of the outer tube mold the same as the outer diameter of the flowing brick. S4-1-2. Manufacture the inner tube mold; make the inner tube mold include an inner tube part and a bottom extrusion part connected from top to bottom; make the outer peripheral shape of the inner tube part match the inner shape of the flowing brick; make the outer diameter of the bottom extrusion part the same as the inner diameter of the outer tube mold, and make the upper surface shape of the bottom extrusion part match the rear end face of the flowing brick. And open positioning holes on the upper surface of the bottom extrusion part according to the number and distribution positions of the plurality of blowing pipes. S4-1-3. Manufacture the extrusion plate; open a through hole in the middle of the extrusion plate for sleeving the inner tube part. S4-1-4. According to the number and distribution positions of the plurality of blowing pipes, connect positioning rods with the same outer diameter as the blowing pipes to the bottom of the extrusion plate. S4-1-5. Manufacture the extrusion mold; open a through hole in the middle of the extrusion mold for sleeving the inner tube part; make the lower surface shape of the extrusion mold match the front end face of the flowing brick; and open a through hole in the extrusion mold for the positioning rod to pass through. S4-1-6. Place the inner tube mold vertically into the outer tube mold, then sleeved the extrusion mold and the extrusion plate onto the inner tube part in sequence, and insert the positioning rods into the positioning holes one by one to make the flowing brick mold.

9. The manufacturing method according to claim 8, characterized in that, The specific steps of taking out the flowing brick from the flowing brick mold in step S4-3 include: S4-3-1. While pressing the extrusion mold tightly, pull out the extrusion plate together with the positioning rod upward from the flowing brick. S4-3-2. Take out the extrusion mold from the inner tube part. S4-3-3. Make the inner tube mold move upward relative to the outer tube mold to eject the flowing brick.

10. A manufacturing method as described in claim 9, characterized in that, The specific steps of putting the gas distribution pipe and the air inlet pipe into the bowl-shaped brick mold together, filling the refractory material into the bowl-shaped brick mold, and manufacturing the bowl-shaped brick with the gas distribution pipe and the air inlet pipe by isostatic pressing process in step S2 include: S2-1. Put the gas distribution pipe and the air inlet pipe into the bowl-shaped brick mold together; and make the air inlet pipe fit with the inner side wall of the bowl-shaped brick mold, and the gas distribution pipe fit with the inner bottom side wall of the bowl-shaped brick mold. S2-2. Fill the refractory material into the bowl-shaped brick mold, and manufacture the bowl-shaped brick with the gas distribution pipe and the air inlet pipe by isostatic pressing process.

Images