CN111334640B - Air supply brick and preparation method thereof - Google Patents
Air supply brick and preparation method thereof Download PDFInfo
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- CN111334640B CN111334640B CN202010176790.4A CN202010176790A CN111334640B CN 111334640 B CN111334640 B CN 111334640B CN 202010176790 A CN202010176790 A CN 202010176790A CN 111334640 B CN111334640 B CN 111334640B
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- air chamber
- stainless steel
- bottom plate
- plate
- hole
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- 239000011449 brick Substances 0.000 title claims abstract description 97
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 227
- 239000010935 stainless steel Substances 0.000 claims abstract description 227
- 239000002184 metal Substances 0.000 claims abstract description 127
- 238000003466 welding Methods 0.000 claims abstract description 94
- 238000005553 drilling Methods 0.000 claims abstract description 30
- 239000011819 refractory material Substances 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 31
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 16
- 230000035699 permeability Effects 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000010009 beating Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000012797 qualification Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 46
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 38
- 229910052786 argon Inorganic materials 0.000 description 19
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000007664 blowing Methods 0.000 description 8
- 238000009423 ventilation Methods 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses an air supply brick and a preparation method thereof, wherein the air supply brick comprises an air supply brick body and an air chamber, a first end of a stainless steel metal vent pipe in the air supply brick body extends out of the air supply brick body and extends into a bottom plate hole on a bottom plate of the air chamber, and a pipe wall of the stainless steel metal vent pipe is welded with a hole wall of the bottom plate hole; a stainless steel bottom plate is arranged between the air chamber bottom plate and the inner cavity of the air chamber, and a drilling hole is arranged on the stainless steel bottom plate; the first end of the stainless steel metal vent pipe extends out of the air supply brick body and sequentially passes through the bottom plate hole and the drill hole, and the pipe wall of the stainless steel metal vent pipe is welded with the hole wall of the drill hole; the bottom plate of the air chamber is welded with the stainless steel bottom plate. After the air supply brick with the structure is welded, micropores and microcracks generated in the original welding mode are avoided. Through air tightness detection, the qualification rate reaches more than 99%, so that the welding quality of the air supply bricks is effectively ensured, and the qualification rate of products is improved.
Description
Technical Field
The invention relates to the technical field of refractory materials for steel smelting. In particular to an air supply brick and a preparation method thereof.
Background
The gas supply brick of the converter is also called as a converter air brick and a gas supply element (hereinafter referred to as a gas supply brick) which is installed at the bottom of the converter and through which gas (including N) is blown into the converter during steelmaking of the converter 2 、Ar 2 、CO 2 ) And a composite functional element for providing bottom blowing stirring power for molten steel.
The top-bottom composite blowing is an important direction of the development of the converter steelmaking technology, and the bottom-blowing air supply brick is the core for realizing the converter composite blowing technology, so that the aims of shortening smelting time, homogenizing molten steel temperature and components, reducing molten steel inclusion, improving metal yield and reducing ferroalloy consumption can be achieved by adopting a bottom-blowing process. Along with the expansion of the demands of the market on pure steel and high-quality special steel and the gradual increase of the capacity and the improvement of the service life of a converter, the converter air supply brick also provides higher requirements, so that the requirements on the performance of the combined blowing process can be met, and the combined blowing process has a simple structure, and is safe and reliable.
The converter bottom blowing air supply brick widely used at home and abroad is mainly an oriented microporous air supply brick. The stainless steel air brick is formed by compounding refractory materials and stainless steel metal air pipes, the refractory materials and the stainless steel metal air pipes are uniformly and regularly distributed at the center of the air brick, and when the stainless steel air brick is used, air flows in the metal pipes, so that the resistance is small, and the air permeability is good; the gas quantity adjusting range is large and exceeds 10 times of the maximum flow of gas required by converter steelmaking, thereby meeting the requirements of a converter smelting gas supply mode; the safety is good, and even under the extreme condition of gas interruption, molten steel cannot be consistent to the bottom, and is solidified at the upper part of the gas chamber.
As shown in fig. 4, the big end of the air supply brick is embedded with an air chamber, a plurality of straight-through ventilation pipes which are orderly arranged are embedded in the brick along the height direction, the ventilation pipes are stainless steel pipes, one ends of the steel pipes are connected with the bottom plate of the air chamber by argon arc welding technology, and the welded parts further comprise: the air chamber side plate and the air chamber bottom plate, the air chamber side plate and the air chamber cover plate, and the air chamber cover plate and the air chamber tail pipe are required to have no cracks at the welding seams, and no air leakage is caused during pressurizing and ventilation. The bottom plate is deformed and polluted in the forming process, the bottom plate of the gas supply air chamber is directly welded with the stainless steel pipe, micropores and microcracks are generated after welding, and the gas tightness detection is unqualified and can not reach the detection standard, so that the gas supply air chamber is scrapped.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide the air supply brick which has the sealing performance and the air permeability meeting the detection requirements and effectively improves the welding qualification rate and the preparation method thereof.
In order to solve the technical problems, the invention provides the following technical scheme:
the air supply brick comprises an air supply brick body and an air chamber, wherein a first end of a stainless steel metal vent pipe in the air supply brick body extends out of the air supply brick body and extends into a bottom plate hole on an air chamber bottom plate of the air chamber, and the pipe wall of the stainless steel metal vent pipe is welded with the hole wall of the bottom plate hole; a stainless steel bottom plate is arranged between the bottom plate of the air chamber and the inner cavity of the air chamber, and a drilling hole is arranged on the stainless steel bottom plate; the first end of the stainless steel metal vent pipe extends out of the air supply brick body and sequentially passes through the bottom plate hole and the drilling hole, and the pipe wall of the stainless steel metal vent pipe is welded with the hole wall of the drilling hole; the air chamber bottom plate is welded with the stainless steel bottom plate.
The stainless steel bottom plate, the air chamber side plate of the air chamber and the air chamber cover plate of the air chamber form the inner cavity; the air chamber side plate is positioned between the stainless steel bottom plate and the air chamber cover plate, an air chamber tail pipe of the air chamber is in welded connection with the air chamber cover plate, and the air chamber tail pipe is in fluid communication with the inner cavity.
The thickness of the stainless steel bottom plate of the air supply brick is 0.5-3mm, the diameter of the drilled hole is 0.2-0.4mm larger than the outer diameter of the stainless steel metal vent pipe, and the thickness of the air chamber bottom plate is 8-10mm.
Above-mentioned air feed brick, the thickness of stainless steel bottom plate is 1mm.
Above-mentioned air feed brick, the thickness of stainless steel bottom plate is 2mm.
Above-mentioned air feed brick, stainless steel metal breather pipe with the bottom plate hole one-to-one, the bottom plate hole with the drilling one-to-one.
Above-mentioned air feed brick, the air feed brick body is the refractory brick body, the internal diameter of stainless steel metal ventilation pipe is 0.5-2.0mm, the wall thickness of stainless steel metal ventilation pipe is 0.5-1.0mm.
The preparation method of the air supply brick, such as the air supply brick, comprises the following steps:
(A) The two ends of the stainless steel metal vent pipe are welded and sealed before the production and the production are started, so that the stainless steel metal vent pipe is prevented from being blocked in the production and the production process; one end of a stainless steel metal vent pipe is inserted into a bottom plate hole on the bottom plate of the air chamber from one side of the bottom plate of the air chamber towards the refractory material plate surface, and extends out of the other side of the bottom plate of the air chamber towards the gas plate surface;
(B) In the die, keeping the stainless steel metal vent pipe and the bottom plate hole coaxial, stacking refractory materials towards the surface of the refractory materials, and ramming and beating the refractory materials until the refractory materials reach the designed height, wherein the refractory materials are filled between the adjacent stainless steel metal vent pipes positioned at one side towards the surface of the refractory materials;
(C) Applying pressure isostatic compaction to the refractory material in the mould so as to form an air supply brick body on one side facing the surface of the refractory material;
(D) Welding connection is carried out between the hole wall of the bottom plate hole and the pipe wall of the stainless steel metal vent pipe on one side facing the gas plate surface, so that the hole wall of the bottom plate hole and the pipe wall of the stainless steel metal vent pipe are sealed, the pipe hole of the stainless steel metal vent pipe is kept transparent in the welding process, and the air permeability is prevented from being reduced due to the blocking of the pipe hole of the stainless steel metal vent pipe in the welding process;
(E) Attaching a stainless steel bottom plate provided with a drilled hole to the gas plate surface of the gas chamber bottom plate from one side of the gas plate surface, enabling one end of the stainless steel metal vent pipe extending out of the gas plate surface to penetrate through the drilled hole and extend out of one side surface of the stainless steel bottom plate, which is away from the gas chamber bottom plate, wherein one side surface of the stainless steel bottom plate, which is away from the gas chamber bottom plate, is a gas contact plate surface, and cutting off the redundant part of the stainless steel metal vent pipe extending out of the gas contact plate surface, so that the length of the stainless steel metal vent pipe extending out of the gas contact plate surface is 1-2mm; the size and shape of the stainless steel bottom plate are the same as those of the air chamber bottom plate, and the thickness of the stainless steel bottom plate is smaller than that of the air chamber bottom plate;
(F) Spot welding is carried out on the adjacent parts of the peripheral vertical faces of the stainless steel bottom plate and the peripheral vertical faces of the air chamber bottom plate, so that the stainless steel bottom plate and the air chamber bottom plate are relatively and fixedly connected;
(G) Performing expansion welding on one end, extending out of the gas contact plate surface, of the stainless steel metal vent pipe at one side of the gas contact plate surface, and performing welding connection between the wall of the drilling hole and the wall of the stainless steel metal vent pipe to enable the wall of the drilling hole to be sealed with the wall of the stainless steel metal vent pipe, wherein the hole of the stainless steel metal vent pipe is kept transparent in the welding process, and the gas permeability is prevented from being deteriorated due to blocking of the hole of the stainless steel metal vent pipe in the welding process;
(H) Abutting the end face of a side plate of the air chamber at one end of the air chamber on the air contact plate surface, wherein the shape and the size of the air chamber are completely the same as those of the air contact plate surface; the side surface of the air chamber side plate is in spot welding connection with the stainless steel bottom plate from the periphery of the outer side;
(I) The side face of the air chamber side plate, the vertical face of the stainless steel bottom plate and the vertical face of the air chamber bottom plate are welded and connected in a sealing manner from the periphery of the outer side to form an annular integral welding belt which continuously and completely covers the vertical face of the periphery of the stainless steel bottom plate, the vertical face of the periphery of the air chamber bottom plate and the side face of the air chamber side plate adjacent to the stainless steel bottom plate; the end face of the air chamber side plate at the other end of the air chamber is in sealing connection with the air chamber cover plate, and the center of the air chamber cover plate is in sealing connection with an air chamber tail pipe; the stainless steel bottom plate, the air chamber side plate of the air chamber and the air chamber cover plate of the air chamber enclose an inner cavity for accommodating air; the stainless steel metal vent pipe and the air chamber tail pipe are respectively communicated with the inner cavity in a fluid way, and the other end of the stainless steel metal vent pipe is cut to enable two ends to be communicated.
According to the preparation method of the air supply brick, the air chamber side plate is of a square cylindrical structure, and the air chamber side plate, the air chamber cover plate and the air chamber tail pipe are mutually independent split components; welding and sealing the side surface of the air chamber side plate and the gas contact plate surface from the periphery of the inner side; abutting the air chamber cover plate on the end face of the air chamber side plate at the other end of the air chamber, and welding and sealing the air chamber cover plate and the air chamber side plate from the periphery; and finally, welding an air chamber tail pipe on the air chamber cover plate central hole.
According to the preparation method of the air supply brick, the air chamber side plate, the air chamber cover plate and the air chamber tail pipe are of prefabricated integrated structures; and the air chamber side plate and the air chamber cover plate are of an integrated structure.
The technical scheme of the invention has the following beneficial technical effects:
by installing the stainless steel bottom plate between the bottom plate of the air chamber and the inner cavity of the air chamber, the technical defects that micropores and microcracks are generated after welding, the air tightness is unqualified and the detection standard is not met, so that the bottom plate of the air chamber is scrapped due to deformation and pollution of the bottom plate of the air chamber in the isostatic compaction process are avoided. Meanwhile, the thin bottom plate made of the stainless steel plate is similar to the stainless steel tube made of the stainless steel plate, and the stainless steel plate is easy to weld. The air brick can also be applied to electric furnace production. The stainless steel bottom plate cannot be too thin, so that the safety is not high during spot welding, the welding is easy to pass, and the target sealing effect cannot be realized; the stainless steel bottom plate cannot be too thick, steel is consumed too much, and unnecessary waste is caused.
After the air supply brick with the structure is welded, micropores and microcracks generated in the original welding mode are avoided. Through air tightness detection, the qualification rate reaches more than 99%, so that the welding quality of the air supply bricks is effectively ensured, and the qualification rate of products is improved.
Drawings
FIG. 1 is a schematic view of the structure of the air supply brick of the present invention;
FIG. 2 is a schematic top view of the air block of the present invention;
FIG. 3 is an enlarged schematic view of a portion of FIG. 1 of the air block of the present invention;
FIG. 4 is a schematic diagram of a prior art air block;
fig. 5 is a schematic structural view of an annular integral welding strip of the air supply brick of the present invention.
The reference numerals in the drawings are as follows: 1-a gas supply brick body; 1-1 of stainless steel metal vent pipes; 2-stainless steel bottom plate; 2-1 drilling; 2-2-gas contact plate surfaces; 3-air chamber; 3-1-a bottom plate of the air chamber; 3-2-air chamber side plates; 3-3-air chamber cover plate; 3-4-air chamber tail pipes; 3-5 inner cavities; 4-annular integral welding strip.
Detailed Description
Example 1
As shown in fig. 1 and 3, the air supply brick of the embodiment comprises an air supply brick body 1 and an air chamber 3, wherein a first end of a stainless steel metal vent pipe 1-1 in the air supply brick body 1 extends out of the air supply brick body 1 and extends into a bottom plate hole on an air chamber bottom plate 3-1 of the air chamber 3, and the pipe wall of the stainless steel metal vent pipe 1-1 is in argon arc welding connection with the hole wall of the bottom plate hole; a stainless steel bottom plate 2 is arranged between the air chamber bottom plate 3-1 and the inner cavity 3-5 of the air chamber 3, and a drilling hole 2-1 is arranged on the stainless steel bottom plate 2; the first end of the stainless steel metal vent pipe 1-1 extends out of the air supply brick body 1 and sequentially passes through the bottom plate hole and the drilling hole 2-1, and argon arc welding connection is formed between the pipe wall of the stainless steel metal vent pipe 1-1 and the hole wall of the drilling hole 2-1; the air chamber bottom plate 3-1 is welded with the stainless steel bottom plate 2 through argon arc welding.
The stainless steel bottom plate 2, the air chamber side plate 3-2 of the air chamber 3 and the air chamber cover plate 3-3 of the air chamber 3 enclose the inner cavity 3-5; the air chamber side plate 3-2 is positioned between the stainless steel bottom plate 2 and the air chamber cover plate 3-3, an air chamber tail pipe 3-4 of the air chamber 3 is connected with the air chamber cover plate 3-3 through argon arc welding, and the air chamber tail pipe 3-4 is in fluid conduction with the inner cavity 3-5.
The thickness of the stainless steel bottom plate 2 is 1mm, the diameter of the drilling hole 2-1 is 0.2mm larger than the outer diameter of the stainless steel metal vent pipe 1-1, and the thickness of the air chamber bottom plate 3-1 is 8mm. The stainless steel metal vent pipes 1-1 are in one-to-one correspondence with the bottom plate holes, and the bottom plate holes are in one-to-one correspondence with the drilling holes 2-1. The air supply brick body 1 is a refractory brick body, the inner diameter of the stainless steel metal vent pipe 1-1 is 0.5mm, and the wall thickness of the stainless steel metal vent pipe 1-1 is 0.5mm. The welding is argon arc welding.
The specific assembly process comprises the following steps:
one side of the air chamber bottom plate 3-1 is added with a layer of stainless steel bottom plate 2 with the thickness of 1mm, and a stainless steel metal vent pipe 1-1 in the air supply brick body 1 is sleeved into a drilled hole 2-1 of the stainless steel bottom plate 2, so that the shape of the stainless steel bottom plate 2 is overlapped with that of the air chamber bottom plate 3-1.
The drill holes 2-1 on the stainless steel bottom plate 2 are required to be consistent with the hole pattern arrangement and the interval of the bottom plate holes of the air chamber bottom plate 3-1, and the diameter of the drill holes 2-1 is 0.2mm larger than the outer diameter of the stainless steel metal vent pipe 1-1.
Cutting off redundant parts of the stainless steel metal vent pipe 1-1 before welding, and enabling the length of the stainless steel metal vent pipe 1-1 exposed out of the outer surface of the stainless steel bottom plate 2 to be 1-2mm, so as to leave welding amount.
Then the holes in the stainless steel metal vent pipe 1-1 are penetrated, so that the air permeability is prevented from being deteriorated due to the blocking of the inner holes of the pipe in the welding process. And (3) performing expansion welding on the periphery of each stainless steel metal vent pipe 1-1 and the stainless steel bottom plate 2 by adopting argon arc welding, and welding to be solid, so that leakage points cannot be generated by welding. And ensure that the inside of each pipe is unblocked after welding.
Finally, all gaps between the air chamber side plate 3-2 and the air chamber bottom plate 3-1 and all gaps between the air chamber cover plate 3-3 are welded, and the air chamber cover plate 3-3 and the air chamber tail pipe 3-4 are welded.
The air brick can also be applied to electric furnace production.
Example 2
As shown in fig. 1 and 3, the air supply brick of the embodiment comprises an air supply brick body 1 and an air chamber 3, wherein a first end of a stainless steel metal vent pipe 1-1 in the air supply brick body 1 extends out of the air supply brick body 1 and extends into a bottom plate hole on an air chamber bottom plate 3-1 of the air chamber 3, and the pipe wall of the stainless steel metal vent pipe 1-1 is in argon arc welding connection with the hole wall of the bottom plate hole; a stainless steel bottom plate 2 is arranged between the air chamber bottom plate 3-1 and the inner cavity 3-5 of the air chamber 3, and a drilling hole 2-1 is arranged on the stainless steel bottom plate 2; the first end of the stainless steel metal vent pipe 1-1 extends out of the air supply brick body 1 and sequentially passes through the bottom plate hole and the drilling hole 2-1, and argon arc welding connection is formed between the pipe wall of the stainless steel metal vent pipe 1-1 and the hole wall of the drilling hole 2-1; the air chamber bottom plate 3-1 is welded with the stainless steel bottom plate 2 through argon arc welding.
The stainless steel bottom plate 2, the air chamber side plate 3-2 of the air chamber 3 and the air chamber cover plate 3-3 of the air chamber 3 enclose the inner cavity 3-5; the air chamber side plate 3-2 is positioned between the stainless steel bottom plate 2 and the air chamber cover plate 3-3, an air chamber tail pipe 3-4 of the air chamber 3 is connected with the air chamber cover plate 3-3 through argon arc welding, and the air chamber tail pipe 3-4 is in fluid conduction with the inner cavity 3-5.
The thickness of the stainless steel bottom plate 2 is 2mm, the diameter of the drilling hole 2-1 is 0.3mm larger than the outer diameter of the stainless steel metal vent pipe 1-1, and the thickness of the air chamber bottom plate 3-1 is 9mm. The stainless steel metal vent pipes 1-1 are in one-to-one correspondence with the bottom plate holes, and the bottom plate holes are in one-to-one correspondence with the drilling holes 2-1. The air supply brick body 1 is a refractory brick body, the inner diameter of the stainless steel metal vent pipe 1-1 is 1.0mm, and the wall thickness of the stainless steel metal vent pipe 1-1 is 0.75mm. The welding is argon arc welding.
The specific assembly process comprises the following steps:
one side of the air chamber bottom plate 3-1 is added with a layer of stainless steel bottom plate 2 with the thickness of 2mm, and a stainless steel metal vent pipe 1-1 in the air supply brick body 1 is sleeved into a drilled hole 2-1 of the stainless steel bottom plate 2, so that the shape of the stainless steel bottom plate 2 is overlapped with that of the air chamber bottom plate 3-1.
The drill holes 2-1 on the stainless steel bottom plate 2 are required to be consistent with the hole pattern arrangement and the interval of the bottom plate holes of the air chamber bottom plate 3-1, and the diameter of the drill holes 2-1 is 0.3mm larger than the outer diameter of the stainless steel metal vent pipe 1-1.
Cutting off redundant parts of the stainless steel metal vent pipe 1-1 before welding, and enabling the length of the stainless steel metal vent pipe 1-1 exposed out of the outer surface of the stainless steel bottom plate 2 to be 1-2mm, so as to leave welding amount.
Then the holes in the stainless steel metal vent pipe 1-1 are penetrated, so that the air permeability is prevented from being deteriorated due to the blocking of the inner holes of the pipe in the welding process. And (3) performing expansion welding on the periphery of each stainless steel metal vent pipe 1-1 and the stainless steel bottom plate 2 by adopting argon arc welding, and welding to be solid, so that leakage points cannot be generated by welding. And ensure that the inside of each pipe is unblocked after welding.
Finally, all gaps between the air chamber side plate 3-2 and the air chamber bottom plate 3-1 and all gaps between the air chamber cover plate 3-3 are welded, and the air chamber cover plate 3-3 and the air chamber tail pipe 3-4 are welded.
The air brick can also be applied to electric furnace production.
Example 3
As shown in fig. 1 and 3, the air supply brick of the embodiment comprises an air supply brick body 1 and an air chamber 3, wherein a first end of a stainless steel metal vent pipe 1-1 in the air supply brick body 1 extends out of the air supply brick body 1 and extends into a bottom plate hole on an air chamber bottom plate 3-1 of the air chamber 3, and the pipe wall of the stainless steel metal vent pipe 1-1 is in argon arc welding connection with the hole wall of the bottom plate hole; a stainless steel bottom plate 2 is arranged between the air chamber bottom plate 3-1 and the inner cavity 3-5 of the air chamber 3, and a drilling hole 2-1 is arranged on the stainless steel bottom plate 2; the first end of the stainless steel metal vent pipe 1-1 extends out of the air supply brick body 1 and sequentially passes through the bottom plate hole and the drilling hole 2-1, and argon arc welding connection is formed between the pipe wall of the stainless steel metal vent pipe 1-1 and the hole wall of the drilling hole 2-1; the air chamber bottom plate 3-1 is welded with the stainless steel bottom plate 2 through argon arc welding.
The stainless steel bottom plate 2, the air chamber side plate 3-2 of the air chamber 3 and the air chamber cover plate 3-3 of the air chamber 3 enclose the inner cavity 3-5; the air chamber side plate 3-2 is positioned between the stainless steel bottom plate 2 and the air chamber cover plate 3-3, an air chamber tail pipe 3-4 of the air chamber 3 is connected with the air chamber cover plate 3-3 through argon arc welding, and the air chamber tail pipe 3-4 is in fluid conduction with the inner cavity 3-5.
The thickness of the stainless steel bottom plate 2 is 3mm, the diameter of the drilling hole 2-1 is 0.4mm larger than the outer diameter of the stainless steel metal vent pipe 1-1, and the thickness of the air chamber bottom plate 3-1 is 10mm. The stainless steel metal vent pipes 1-1 are in one-to-one correspondence with the bottom plate holes, and the bottom plate holes are in one-to-one correspondence with the drilling holes 2-1. The air supply brick body 1 is a refractory brick body, the inner diameter of the stainless steel metal vent pipe 1-1 is 2.0mm, and the wall thickness of the stainless steel metal vent pipe 1-1 is 1.0mm. The welding is argon arc welding.
The specific assembly process comprises the following steps:
one side of the air chamber bottom plate 3-1 is added with a layer of stainless steel bottom plate 2 with the thickness of 3mm, and a stainless steel metal vent pipe 1-1 in the air supply brick body 1 is sleeved into a drilled hole 2-1 of the stainless steel bottom plate 2, so that the shape of the stainless steel bottom plate 2 is overlapped with that of the air chamber bottom plate 3-1.
The drill holes 2-1 on the stainless steel bottom plate 2 are required to be consistent with the hole pattern arrangement and the interval of the bottom plate holes of the air chamber bottom plate 3-1, and the diameter of the drill holes 2-1 is 0.4mm larger than the outer diameter of the stainless steel metal vent pipe 1-1.
Cutting off redundant parts of the stainless steel metal vent pipe 1-1 before welding, and enabling the length of the stainless steel metal vent pipe 1-1 exposed out of the outer surface of the stainless steel bottom plate 2 to be 1-2mm, so as to leave welding amount.
Then the holes in the stainless steel metal vent pipe 1-1 are penetrated, so that the air permeability is prevented from being deteriorated due to the blocking of the inner holes of the pipe in the welding process. And (3) performing expansion welding on the periphery of each stainless steel metal vent pipe 1-1 and the stainless steel bottom plate 2 by adopting argon arc welding, and welding to be solid, so that leakage points cannot be generated by welding. And ensure that the inside of each pipe is unblocked after welding.
Finally, all gaps between the air chamber side plate 3-2 and the air chamber bottom plate 3-1 and all gaps between the air chamber cover plate 3-3 are welded, and the air chamber cover plate 3-3 and the air chamber tail pipe 3-4 are welded.
The air brick can also be applied to electric furnace production.
Example 4
The method for preparing the air brick in examples 1 to 3 comprises the following steps:
A. before starting the processing production, the two ends of the stainless steel metal vent pipe 1-1 are welded and sealed, so that the stainless steel metal vent pipe 1-1 is prevented from being blocked in the production and processing process; one end of a stainless steel metal vent pipe 1-1 is inserted into a bottom plate hole on the air chamber bottom plate 3-1 from the surface of the air chamber bottom plate 3-1 facing the refractory material, and extends out of the surface of the air chamber bottom plate 3-1 facing the air plate;
B. in the mould, keeping the stainless steel metal vent pipe 1-1 coaxial with the bottom plate hole, stacking refractory materials towards the refractory material plate surface, and ramming and beating the refractory materials until the refractory materials reach the designed height, wherein the refractory materials are filled between the adjacent stainless steel metal vent pipes 1-1 positioned at one side towards the refractory material plate surface;
C. applying pressure isostatic compaction to the refractory material in the mould so as to form an air supply brick body 1 on the side facing the surface of the refractory material;
D. welding connection is carried out between the hole wall of the bottom plate hole and the pipe wall of the stainless steel metal vent pipe 1-1 on one side facing the gas plate surface, so that the hole wall of the bottom plate hole and the pipe wall of the stainless steel metal vent pipe 1-1 are sealed, the pipe hole of the stainless steel metal vent pipe 1-1 is kept transparent in the welding process, and the air permeability is prevented from being deteriorated due to the blocking of the pipe hole of the stainless steel metal vent pipe 1-1 in the welding process;
E. from one side facing to the gas plate surface, attaching a stainless steel bottom plate 2 provided with a drilling hole 2-1 to the gas plate surface facing to the gas chamber bottom plate 3-1, wherein one end of the stainless steel metal vent pipe 1-1 extending out of the gas plate surface passes through the drilling hole 2-1 and extends out of one side surface of the stainless steel bottom plate 2, which is away from the gas chamber bottom plate 3-1, is a gas contact plate surface 2-2, and the redundant part of the stainless steel metal vent pipe 1-1 extending out of the gas contact plate surface 2-2 is cut off, so that the length of the stainless steel metal vent pipe 1-1 extending out of the gas contact plate surface 2-2 is 1-2mm; the size and shape of the stainless steel bottom plate 2 are the same as those of the air chamber bottom plate 3-1, and the thickness of the stainless steel bottom plate 2 is smaller than that of the air chamber bottom plate 3-1;
F. spot welding is carried out on the adjacent parts of the peripheral vertical faces of the stainless steel bottom plate 2 and the peripheral vertical faces of the air chamber bottom plate 3-1, so that the stainless steel bottom plate 2 and the air chamber bottom plate 3-1 are relatively and fixedly connected;
G. one side of the gas contact plate surface 2-2 is welded at one end of the stainless steel metal vent pipe 1-1 extending out of the gas contact plate surface 2-2 in a spread manner, and the wall of the drill hole 2-1 is welded with the wall of the stainless steel metal vent pipe 1-1, so that the wall of the drill hole 2-1 is sealed with the wall of the stainless steel metal vent pipe 1-1, and the pipe hole of the stainless steel metal vent pipe 1-1 is kept transparent in the welding process, so that the ventilation is prevented from being poor due to the blocking of the pipe hole of the stainless steel metal vent pipe 1-1 in the welding process;
H. abutting the end face of a gas chamber side plate 3-2 at one end of a gas chamber 3 against the gas contact plate surface 2-2, wherein the shape and the size of the gas chamber 3 are identical to those of the gas contact plate surface 2-2; the side surface of the air chamber side plate 3-2 is in spot welding connection with the stainless steel bottom plate 2 from the periphery of the outer side;
I. welding and sealing the side surface of the air chamber side plate 3-2, the vertical surface of the stainless steel bottom plate 2 and the vertical surface of the air chamber bottom plate 3-1 from the outer periphery to form an annular integral welding belt 4 which continuously and completely covers the peripheral vertical surface of the stainless steel bottom plate 2, the peripheral vertical surface of the air chamber bottom plate 3-1 and the side surface of the air chamber side plate 3-2 adjacent to the stainless steel bottom plate 2; the end face of the air chamber side plate 3-2 at the other end of the air chamber 3 is connected with the air chamber cover plate 3-3 in a sealing way, and the center of the air chamber cover plate 3-3 is connected with an air chamber tail pipe 3-4 in a sealing way; an inner cavity 3-5 for containing gas is formed by enclosing the stainless steel bottom plate 2, the air chamber side plate 3-2 of the air chamber 3 and the air chamber cover plate 3-3 of the air chamber 3; the stainless steel metal vent pipe 1-1 and the air chamber tail pipe 3-4 are respectively in fluid communication with the inner cavity 3-5, and the other end of the stainless steel metal vent pipe 1-1 is cut to enable two ends to be in communication.
In this embodiment, the air chamber side plate 3-2 has a square cylindrical structure, and the air chamber side plate 3-2, the air chamber cover plate 3-3 and the air chamber tail pipe 3-4 are separate components; the side surface of the air chamber side plate 3-2 and the air contact plate surface 2-2 are welded and sealed from the periphery of the inner side; abutting the air chamber cover plate 3-3 against the end face of the air chamber side plate 3-2 at the other end of the air chamber 3, and welding and sealing the air chamber cover plate 3-3 and the air chamber side plate 3-2 from the periphery; and finally, welding an air chamber tail pipe 3-4 on the central hole of the air chamber cover plate 3-3.
In addition, the air chamber side plate 3-2, the air chamber cover plate 3-3 and the air chamber tail pipe 3-4 can also be prefabricated integrated structures; and the air chamber side plate 3-2 and the air chamber cover plate 3-3 are of an integrated structure.
Because the stainless steel metal vent pipe 1-1, the air chamber bottom plate 3-1 and the refractory material are isostatically molded together in the prior art, after the air supply brick body 1 is formed, the surface of the air chamber bottom plate 3-1 bears great pressure during pressure molding, and the surface of the air chamber bottom plate 3-1 possibly has tiny cracks to cause that the air tightness or pressure-bearing air tightness cannot meet the requirements; after isostatic compaction, the air chamber bottom plate 3-1 is polluted and unclean towards the air plate surface, the hole wall of the bottom plate hole and the outer surface of the pipe wall of the stainless steel metal vent pipe 1-1, and after the hole wall of the bottom plate hole and the outer surface of the pipe wall of the stainless steel metal vent pipe 1-1 are welded and sealed, the air tightness of a welding seam or the pressure-bearing air tightness is possibly insufficient, so that after the air supply brick is manufactured in the prior art, the air leakage phenomenon occurs on the contact surface of the air chamber bottom plate 3-1 towards the refractory material, and the qualification rate is lower. By adopting the preparation method provided by the invention, a plurality of defects existing in the existing production process can be avoided to the greatest extent, the air tightness of the produced air supply bricks is detected, the qualification rate is up to more than 99%, the welding quality of the air supply bricks is effectively ensured, and the qualification rate of products is improved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While the obvious variations or modifications which are extended therefrom remain within the scope of the claims of this patent application.
Claims (8)
1. The preparation method of the air supply brick is characterized in that the air supply brick comprises an air supply brick body (1) and an air chamber (3), wherein a first end of a stainless steel metal vent pipe (1-1) in the air supply brick body (1) extends out of the air supply brick body (1) and extends into a bottom plate hole on an air chamber bottom plate (3-1) of the air chamber (3), and a pipe wall of the stainless steel metal vent pipe (1-1) is welded with a hole wall of the bottom plate hole; a stainless steel bottom plate (2) is arranged between the air chamber bottom plate (3-1) and the inner cavity (3-5) of the air chamber (3), and a drilling hole (2-1) is arranged on the stainless steel bottom plate (2); the first end of the stainless steel metal vent pipe (1-1) extends out of the air supply brick body (1) and then sequentially passes through the bottom plate hole and the drilling hole (2-1), and the pipe wall of the stainless steel metal vent pipe (1-1) is welded with the hole wall of the drilling hole (2-1); the air chamber bottom plate (3-1) is welded with the stainless steel bottom plate (2); the stainless steel bottom plate (2), the air chamber side plate (3-2) of the air chamber (3) and the air chamber cover plate (3-3) of the air chamber (3) form an inner cavity (3-5) in a surrounding mode; the air chamber side plate (3-2) is positioned between the stainless steel bottom plate (2) and the air chamber cover plate (3-3), an air chamber tail pipe (3-4) of the air chamber (3) is in welded connection with the air chamber cover plate (3-3), and the air chamber tail pipe (3-4) is in fluid conduction with the inner cavity (3-5);
the preparation method of the air supply brick comprises the following steps:
(A) The two ends of the stainless steel metal vent pipe (1-1) are sealed by welding before starting the processing production, so that the stainless steel metal vent pipe (1-1) is prevented from being blocked in the production and processing process; one end of a stainless steel metal vent pipe (1-1) is inserted into a bottom plate hole on the air chamber bottom plate (3-1) from one side of the air chamber bottom plate (3-1) towards the refractory material plate surface, and extends out of the other side of the air chamber bottom plate (3-1) towards the gas plate surface;
(B) In the die, keeping the stainless steel metal vent pipe (1-1) and the bottom plate hole coaxial, stacking refractory materials on the surface facing the refractory materials, and ramming and beating the refractory materials until the refractory materials reach a designed height, wherein the refractory materials are filled between the adjacent stainless steel metal vent pipes (1-1) positioned on the side facing the surface of the refractory materials;
(C) Applying pressure to the refractory material in the mould to carry out isostatic compaction, thereby forming a gas supply brick body (1) on one side facing the surface of the refractory material;
(D) Welding connection is carried out between the hole wall of the bottom plate hole and the pipe wall of the stainless steel metal vent pipe (1-1) on one side facing the gas plate surface, so that the hole wall of the bottom plate hole and the pipe wall of the stainless steel metal vent pipe (1-1) are sealed, the pipe hole of the stainless steel metal vent pipe (1-1) is kept transparent in the welding process, and the air permeability is prevented from being deteriorated due to the blocking of the pipe hole of the stainless steel metal vent pipe (1-1) in the welding process;
(E) From one side facing to the gas plate surface, attaching a stainless steel bottom plate (2) provided with a drilling hole (2-1) to the gas plate surface facing to the gas chamber bottom plate (3-1), enabling one end of the stainless steel metal vent pipe (1-1) extending out of the gas plate surface to penetrate through the drilling hole (2-1) and extend out of one side surface of the stainless steel bottom plate (2) deviating from the gas chamber bottom plate (3-1), enabling one side surface of the stainless steel bottom plate (2) deviating from the gas chamber bottom plate (3-1) to be a gas contact plate surface (2-2), and cutting off redundant parts of the stainless steel metal vent pipe (1-1) extending out of the gas contact plate surface (2-2) so that the length of the stainless steel metal vent pipe (1-1) extending out of the gas contact plate surface (2-2) is 1-2mm; the size and shape of the stainless steel bottom plate (2) are the same as those of the air chamber bottom plate (3-1), and the thickness of the stainless steel bottom plate (2) is smaller than that of the air chamber bottom plate (3-1);
(F) Spot welding is carried out on the adjacent parts of the peripheral vertical faces of the stainless steel bottom plate (2) and the peripheral vertical faces of the air chamber bottom plate (3-1), so that the stainless steel bottom plate (2) and the air chamber bottom plate (3-1) are relatively and fixedly connected;
(G) One side of the gas contact plate surface (2-2) is welded at one end of the stainless steel metal vent pipe (1-1) extending out of the gas contact plate surface (2-2), the hole wall of the drill hole (2-1) is welded with the pipe wall of the stainless steel metal vent pipe (1-1), the hole wall of the drill hole (2-1) is sealed with the pipe wall of the stainless steel metal vent pipe (1-1), and the pipe hole of the stainless steel metal vent pipe (1-1) is kept transparent in the welding process, so that the air permeability is prevented from being deteriorated due to the blocking of the pipe hole of the stainless steel metal vent pipe (1-1) in the welding process;
(H) Abutting the end face of a gas chamber side plate (3-2) at one end of a gas chamber (3) against the gas contact plate surface (2-2), wherein the shape and the size of the gas chamber (3) are completely the same as those of the gas contact plate surface (2-2); the side surface of the air chamber side plate (3-2) is in spot welding connection with the stainless steel bottom plate (2) from the periphery of the outer side;
(I) Welding and sealing the side surface of the air chamber side plate (3-2), the vertical surface of the stainless steel bottom plate (2) and the vertical surface of the air chamber bottom plate (3-1) from the periphery to form an annular integral welding belt (4) which continuously and completely covers the vertical surface around the stainless steel bottom plate (2), the vertical surface around the air chamber bottom plate (3-1) and the side surface of the air chamber side plate (3-2) adjacent to the stainless steel bottom plate (2); the end face of an air chamber side plate (3-2) at the other end of the air chamber (3) is connected with an air chamber cover plate (3-3) in a sealing way, and the center of the air chamber cover plate (3-3) is connected with an air chamber tail pipe (3-4) in a sealing way; an inner cavity (3-5) for containing gas is formed by enclosing the stainless steel bottom plate (2), the air chamber side plate (3-2) of the air chamber (3) and the air chamber cover plate (3-3) of the air chamber (3); the stainless steel metal vent pipe (1-1) and the air chamber tail pipe (3-4) are respectively in fluid communication with the inner cavity (3-5), and the other end of the stainless steel metal vent pipe (1-1) is cut to enable two ends to be in communication.
2. The method for manufacturing a gas supply brick according to claim 1, wherein the thickness of the stainless steel bottom plate (2) is 0.5mm-3mm, the diameter of the drilled hole (2-1) is larger than the outer diameter of the stainless steel metal vent pipe (1-1) by 0.2-0.4mm, and the thickness of the gas chamber bottom plate (3-1) is 8-10mm.
3. A method of manufacturing a gas supply brick according to claim 2, characterized in that the stainless steel bottom plate (2) has a thickness of 1mm.
4. A method of manufacturing a gas supply brick according to claim 2, characterized in that the stainless steel bottom plate (2) has a thickness of 2mm.
5. The method for manufacturing the air supply brick according to claim 1, wherein the stainless steel metal vent pipes (1-1) are in one-to-one correspondence with the bottom plate holes, and the bottom plate holes are in one-to-one correspondence with the drill holes (2-1).
6. The method for preparing the air supply brick according to claim 1, wherein the air supply brick body (1) is a refractory brick body, the inner diameter of the stainless steel metal vent pipe (1-1) is 0.5-2.0mm, and the wall thickness of the stainless steel metal vent pipe (1-1) is 0.5-1.0mm.
7. The method for manufacturing the air supply brick according to claim 1, wherein the air chamber side plate (3-2) has a square cylindrical structure, and the air chamber side plate (3-2), the air chamber cover plate (3-3) and the air chamber tail pipe (3-4) are separate components; welding and sealing the side surface of the air chamber side plate (3-2) and the air contact plate surface (2-2) from the periphery of the inner side; abutting an air chamber cover plate (3-3) against the end face of an air chamber side plate (3-2) at the other end of the air chamber (3), and welding and sealing the air chamber cover plate (3-3) and the air chamber side plate (3-2) from the periphery; and finally, welding an air chamber tail pipe (3-4) on the central hole of the air chamber cover plate (3-3).
8. The method for preparing the air supply brick according to claim 1, wherein the air chamber side plate (3-2), the air chamber cover plate (3-3) and the air chamber tail pipe (3-4) are of a prefabricated integrated structure; and the air chamber side plate (3-2) and the air chamber cover plate (3-3) are of an integrated structure.
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| GB1482443A (en) * | 1973-07-27 | 1977-08-10 | Didier Werke Ag | Gas pervious refractory brick |
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| CN101619380A (en) * | 2009-08-03 | 2010-01-06 | 濮阳濮耐高温材料（集团）股份有限公司 | Drawable gas permeable brick |
| CN102676730A (en) * | 2012-05-25 | 2012-09-19 | 宣化钢铁集团有限责任公司 | Converter bottom blowing air brick, special drilling machine and quick thermal replacement method of air brick |
| CN206858604U (en) * | 2017-06-01 | 2018-01-09 | 江苏国窑科技有限公司 | A kind of straight hole ventilation brick |
| CN211771414U (en) * | 2020-03-13 | 2020-10-27 | 濮阳濮耐高温材料（集团）股份有限公司 | Air supply brick |
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2020
- 2020-03-13 CN CN202010176790.4A patent/CN111334640B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1482443A (en) * | 1973-07-27 | 1977-08-10 | Didier Werke Ag | Gas pervious refractory brick |
| CN1066888A (en) * | 1992-06-15 | 1992-12-09 | 冶金工业部钢铁研究总院 | Air supply element for metallurgical furnace bottom and manufacture method |
| CN201368674Y (en) * | 2009-03-24 | 2009-12-23 | 濮阳濮耐高温材料（集团）股份有限公司 | Compound magnesium carbon gas permeable brick for converter |
| CN101619380A (en) * | 2009-08-03 | 2010-01-06 | 濮阳濮耐高温材料（集团）股份有限公司 | Drawable gas permeable brick |
| CN102676730A (en) * | 2012-05-25 | 2012-09-19 | 宣化钢铁集团有限责任公司 | Converter bottom blowing air brick, special drilling machine and quick thermal replacement method of air brick |
| CN206858604U (en) * | 2017-06-01 | 2018-01-09 | 江苏国窑科技有限公司 | A kind of straight hole ventilation brick |
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| CN111334640A (en) | 2020-06-26 |
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