CN117921828A - Integral pouring method for iron notch mud sleeve protection plate - Google Patents
Integral pouring method for iron notch mud sleeve protection plate Download PDFInfo
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- CN117921828A CN117921828A CN202410047184.0A CN202410047184A CN117921828A CN 117921828 A CN117921828 A CN 117921828A CN 202410047184 A CN202410047184 A CN 202410047184A CN 117921828 A CN117921828 A CN 117921828A
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- mud sleeve
- plate
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- mud
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- 238000000034 method Methods 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 68
- 229910052742 iron Inorganic materials 0.000 title claims description 34
- 238000005266 casting Methods 0.000 claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 48
- 230000001681 protective effect Effects 0.000 claims abstract description 38
- 238000003466 welding Methods 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 69
- 239000010959 steel Substances 0.000 claims description 69
- 238000007789 sealing Methods 0.000 claims description 19
- 238000005520 cutting process Methods 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 2
- 206010017740 Gas poisoning Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/093—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
- B28B1/0935—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material using only elements wholly or partly immersed in the material, e.g. cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention relates to the field of blast furnace ironmaking, in particular to an integral pouring method of a taphole mud sleeve protecting plate, which comprises the following steps: step one: manufacturing a taphole protection plate; step two: welding a tap hole protecting plate; step three: making a mud sleeve surface; step four: adding casting materials; step five: and (5) baking. The beneficial effects of the invention are as follows: 1. the integrity of the mud sleeve of the protection board is improved; the shock resistance of the protective plate and the mud sleeve is increased; and the gas series flow of the protective plate and the mud sleeve is reduced. The hidden trouble of protruding production accidents in the production process of the mud sleeve is eliminated. 2. The service cycle of the mud sleeve of the protection board is prolonged, and the mud sleeve is replaced from the original 3 months to the current 6-7 months. 3. And the replacement cost of the mud sleeve is reduced.
Description
Technical Field
The invention relates to the field of blast furnace ironmaking, in particular to an integral pouring method of a tap hole mud sleeve protecting plate.
Background
The tap hole mud sleeve in front of the blast furnace is an important channel in tapping of the blast furnace, and the tap hole protection plate is used for preventing the tap hole frame from directly contacting molten iron and protecting the tap hole frame. At present, most of tap hole mud sleeves and protection plates of blast furnaces are manufactured in time, namely, after the protection plates are poured, the mud sleeves are manufactured in the re-protection plates. The protection board and the mud sleeve manufactured in this way are layered, especially in the later period of one cycle, the protection board and the mud sleeve are subjected to the thermal temperature difference effect for a long time and the physical impact during hydraulic gun plugging, the integrity of the protection board of the mud sleeve is easy to reduce, gaps exist on the joint surface of the mud sleeve of the protection board, gas streaming is caused, and the stability of the iron notch is reduced. However, the production cost and the workload are increased by the re-manufacturing of the mud sleeve, and the gas strung out of the furnace during the manufacturing of the mud sleeve can cause great potential safety hazard.
Thus, there is a need for a new method of making a tap hole mud jacket and a protective plate.
According to the method, for the problem that the integrity of the mud sleeve and the protection plate is poor due to layered casting of the protection plate mud sleeve, the casting method of the mud sleeve protection plate is improved, the integral casting of the tap hole protection plate mud sleeve is realized, gas streaming is eliminated, the stability of the tap hole is improved, and the stable and smooth operation of the blast furnace is ensured.
Disclosure of Invention
The invention aims to solve the problems and provides a method for integrally pouring a tap hole mud sleeve protection plate.
The purpose of the invention is realized in the following way: the integral pouring method of the taphole mud sleeve protecting plate comprises the following steps: step one: manufacturing a taphole protection plate: selecting a heat-resistant steel plate with the thickness of 10mm-15mm, wherein the heat-resistant steel plate is 1200mm-1300mm in height and 1200mm in width, determining a quadrilateral structure by taking the lower edge of the steel plate as the side length, selecting a round hole with the diameter of 400mm-450mm at the center of the quadrilateral, reserving the round steel plate for standby, and cutting into two parts similar to an inverted trapezoid by taking the lower edge of the steel plate as a reference and an upper angle of 60-80 DEG at the upper position of 200mm-500mm upwards; step two: welding a taphole protection plate: the hydraulic gun is operated to rotate to a working surface, after the position of a protective plate is determined at the joint of the hydraulic gun and the plane of the iron notch frame, a positioning pin is fixed at the center of a reserved pin hole, the positioning pin is welded on the iron notch frame, the iron notch protective plate is installed, a fixed pin is tightened, a lower common steel plate is welded, and a pouring grouting port is reserved at the upper edge of the protective plate higher than the upper edge of the iron notch frame; step three: making a mud sleeve surface: measuring the length of a hydraulic gun nozzle after the protective plate is welded, turning the hydraulic gun to the position of a reserved hole on the mud sleeve surface of the iron notch protective plate, enabling the lower edge of the gun nozzle to be parallel to the lower edge of the reserved hole on the mud sleeve surface of the protective plate, measuring the length of the upper edge of the gun nozzle entering the protective plate, cutting steel plates with the same length for sealing use, welding the upper edge of the reserved hole on the mud sleeve of the protective plate with a sealing steel plate, welding the upper edge of a round steel plate with the reserved diameter of 400mm-450mm with the sealing steel plate, welding the lower edge of the round steel plate with the reserved hole of the mud sleeve, and filling concave parts and gaps with small cement; step four: adding casting materials: the casting material is preserved from the upper part of the protection plate and is cast with the protection plate and the mud sleeve, when the casting material is cast for half, the positions at two sides of the protection plate are vibrated by the vibration rod, when the casting material is cast and fills up, the casting material is inserted into the bottom of the casting material and is stopped for 10-15s and slowly pulled out, the insertion interval is evenly vibrated by 300-400 mm, and the casting compactness of the casting material is ensured; step five: baking: and after pouring, baking by using gas fire, wherein the gas fire is small for 2-3 hours, the medium fire is medium for 2-3 hours and the large fire is large for 2-3 hours.
When the casting material is cast for half, the vibration frequency of the vibration rod is 1000-1500 times/min; when the pouring material is poured and filled, the vibration frequency of the vibration rod is 2000-3000 times/min.
Step five, the flame length of the medium and small fire is 100-200mm, and the average temperature is 150-180 ℃; the flame length of the medium fire is 200-300mm, the average temperature is 350-380 ℃, and the average temperature of the large fire is 800-900 ℃.
The beneficial effects of the invention are as follows: 1. the integrity of the mud sleeve of the protection board is improved; the shock resistance of the protective plate and the mud sleeve is increased; and the gas series flow of the protective plate and the mud sleeve is reduced. The hidden trouble of protruding production accidents in the production process of the mud sleeve is eliminated. 2. The service cycle of the mud sleeve of the protection board is prolonged, and the mud sleeve is replaced from the original 3 months to the current 6-7 months. 3. The replacement cost of mud jackets is reduced: the special mud sleeve material is about 9800 yuan/ton, and the iron wire material is about 7200 yuan/ton for the protection plate mud sleeve. The casting material is used for casting 1.5 tons at one time. So that: about 3 tons of mud jacking materials are poured after 2 times of mud jacking replacement in the previous 6 months: 3×9800=24000 yuan. Now 1 time of mud sleeve pouring is changed for 6 months, and 1.5 tons of iron wire material is poured: 1.5×7200=10800 yuan. Thus, the cost of one-time replacement of the protective plate mud sleeve is 24000-10800=13200 yuan. 4. Reduces the labor intensity of secondary operation of workers and eliminates the risks of gas poisoning and mechanical injury of secondary operation. 5. Improving the stability of the iron notch, and reducing and ensuring the stable and smooth operation of the blast furnace.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic view of cutting a protection plate.
Fig. 2 is a schematic view of welding of the protection plate.
Fig. 3 is a schematic view (1) of the mud sleeve surface welding.
Fig. 4 is a schematic view (2) of the mud jacket surface welding.
1. The heat-resistant steel plate, the reserved pin holes, the common steel plate, the pouring opening, the black part, the hydraulic gun, the protective plate, the repair welding sealing steel plate and the gun head concave part are filled with small cement.
Description of the embodiments
The integral pouring method of the taphole mud sleeve protecting plate comprises the following steps: step one: manufacturing a taphole protection plate: selecting a heat-resistant steel plate with the thickness of 10mm-15mm, wherein the heat-resistant steel plate is 1200mm-1300mm in height and 1200mm in width, determining a quadrilateral structure by taking the lower edge of the steel plate as the side length, selecting a round hole with the diameter of 400mm-450mm at the center of the quadrilateral, reserving the round steel plate for standby, and cutting into two parts similar to an inverted trapezoid by taking the lower edge of the steel plate as a reference and an upper angle of 60-80 DEG at the upper position of 200mm-500mm upwards; step two: welding a taphole protection plate: the hydraulic gun is operated to rotate to a working surface, after the position of a protective plate is determined at the joint of the hydraulic gun and the plane of the iron notch frame, a positioning pin is fixed at the center of a reserved pin hole, the positioning pin is welded on the iron notch frame, the iron notch protective plate is installed, a fixed pin is tightened, a lower common steel plate is welded, and a pouring grouting port is reserved at the upper edge of the protective plate higher than the upper edge of the iron notch frame; step three: making a mud sleeve surface: measuring the length of a hydraulic gun nozzle after the protective plate is welded, turning the hydraulic gun to the position of a reserved hole on the mud sleeve surface of the iron notch protective plate, enabling the lower edge of the gun nozzle to be parallel to the lower edge of the reserved hole on the mud sleeve surface of the protective plate, measuring the upper edge of the gun nozzle, entering the inner length of the protective plate, cutting steel plates with the same length for sealing use, welding the upper edge of the reserved hole on the mud sleeve of the protective plate with a sealing steel plate, welding the upper edge of a round steel plate with the reserved diameter of 400mm-450mm with the sealing steel plate, and welding the lower edge of the round steel plate with the lower edge of the reserved hole on the mud sleeve, wherein the concave part and the gap are filled with special band cement (small cement) in front of a furnace; step four: adding casting materials: the casting material is preserved from the upper part of the protection plate and is cast with the protection plate and the mud sleeve, when the casting material is cast for half, the ZN50 vibration rod is used for slightly vibrating the two sides of the protection plate (1000-1500 times/min), when the casting material is cast and fills up, the vibration rod is inserted into the bottom of the casting material and is stopped for 10-15 s to slowly pull out, the insertion interval is 300 mm-400 mm and uniformly vibrates (the vibration frequency is 2000-3000 times/min), and the casting compactness of the casting material is ensured; step five: baking: baking by using gas fire after pouring, wherein the average temperature is 150-180 ℃ after 2-3 hours of small fire (flame length is 100-200 mm); medium fire (flame length 200-300 mm) 2-3 hours, average temperature 350-380 deg. and big fire 800-900 deg. 2-3 hours (gas valve open to maximum).
The technical scheme of the invention is as follows: 1. manufacturing a taphole protection plate: a heat-resistant steel plate with the thickness of 10mm-15mm is selected, and the heat-resistant steel plate is required to be 1200mm-1300mm in height and 1200mm in width. The lower edge 1100mm-1200mm of the steel plate is used as a side length to determine a quadrilateral structure, a round hole (slightly larger than the area of a hydraulic gun nozzle) with the diameter of 400mm-450mm is cut at the center of the quadrilateral, and the round steel plate is reserved for standby. The lower edge of the steel plate is cut into two parts similar to inverted trapezoids at the position 200mm-500mm upwards by taking the lower edge of the steel plate as a reference through an angle of 60 DEG to 80 deg. 2. Welding an iron runner protection plate: after the hydraulic gun is operated to rotate to the working face to determine the position of the protecting plate, the positioning pin is fixed at the center of the reserved pin hole, the positioning pin is welded on the iron notch frame, the iron notch protecting plate is installed, and the fixing pin is tightened. And welding a lower common steel plate, and reserving a pouring grouting port on the upper edge of the upper part of the protection plate higher than the upper edge of the iron notch frame. 3. Making a mud sleeve surface: and after the protection plate is welded, measuring the length of the hydraulic gun nozzle, and turning the hydraulic gun to the position of a reserved hole on the mud sleeve surface of the iron notch protection plate. The lower edge of the gun nozzle is parallel to the lower edge of the reserved hole of the mud sleeve surface of the protection plate, the upper edge of the gun nozzle is measured to enter the inner length of the protection plate, the steel plate with the same length is cut for sealing use, and the sealing steel plate is welded on the upper edge of the reserved hole of the mud sleeve of the protection plate. And then the upper edge of the reserved phi 420mm steel plate is welded with the sealing steel plate, and the lower edge of the reserved phi 420mm steel plate is welded with the lower edge of the reserved hole of the mud sleeve. The concave portion and the gap are filled with small cement. 4. Adding casting materials: the casting material is used for casting the protective plate and the mud sleeve through a casting opening reserved above the protective plate. When the casting material is used for casting half of the casting material, the positions of the two sides of the protection plate are slightly vibrated by the vibration rod. When the pouring material is poured and filled, the vibrating rod uniformly vibrates, so that the pouring compactness of the pouring material is ensured. 5. Baking: after casting, baking was performed with a gas fire (small fire for 2 hours, medium fire for 2 hours, and large fire for 2 hours).
The method has good implementation effect in front of a five-blast furnace in a Tai steel iron works: manufacturing a front 2# iron notch protection plate mud sleeve: 1. after the mud sleeve of the protection board is disassembled, a heat-resistant steel plate with the thickness of 10mm is selected, and the heat-resistant steel plate is required to be 1200mm in height and 1200mm in width. And selecting a round hole (slightly larger than the area of a hydraulic gun nozzle) with the diameter of 420mm from the quadrangular central position, and reserving a round steel plate for later use. And cutting the inverted trapezoid by taking the lower edge of the steel plate as a reference and an angle of 80 degrees at a position 200mm upwards. 2. Welding a taphole protection plate: after the hydraulic gun is operated to determine the position of the protection plate, the steel plate is lifted and fixed on the iron notch frame. 3. Making a mud sleeve surface: and after the protection plate is welded, measuring the length of the hydraulic gun nozzle, and turning the hydraulic gun to the position of a reserved hole on the mud sleeve surface of the iron notch protection plate. The lower edge of the gun nozzle is parallel to the lower edge of the reserved hole of the mud sleeve surface of the protection plate, the upper edge of the gun nozzle is measured to enter the inner length of the protection plate, the steel plate with the same length is cut for sealing use, and the sealing steel plate is welded on the upper edge of the reserved hole of the mud sleeve of the protection plate. And then the upper edge of the reserved phi 420mm steel plate is welded with the sealing steel plate, and the lower edge of the reserved phi 420mm steel plate is welded with the lower edge of the reserved hole of the mud sleeve. The concave portion and the gap are filled with small cement. 4. Adding casting materials: the casting material is used for casting the protective plate and the mud sleeve through a casting opening reserved above the protective plate. When the casting material is used for casting half of the casting material, the positions of the two sides of the protection plate are slightly vibrated by the vibration rod. When the pouring material is poured and filled, the vibrating rod uniformly vibrates, so that the pouring compactness of the pouring material is ensured. 5. Baking: and baking by using gas fire after pouring.
Manufacturing a front 3# iron notch protection plate mud sleeve: 1. after the mud sleeve of the protective plate is disassembled, a heat-resistant steel plate with the thickness of 10mm is selected, and the heat-resistant steel plate is required to be 1300mm in height and 1200mm in width. And selecting a round hole (slightly larger than the area of a hydraulic gun nozzle) with the diameter of 430mm from the quadrangular center position, and reserving a round steel plate for later use. And cutting the inverted trapezoid at an upper angle of 60 degrees at a position 300mm upwards by taking the lower edge of the steel plate as a reference. 2. Welding a taphole protection plate: after the hydraulic gun is operated to determine the position of the protection plate, the steel plate is lifted and fixed on the iron notch frame. 3. Making a mud sleeve surface: and after the protection plate is welded, measuring the length of the hydraulic gun nozzle, and turning the hydraulic gun to the position of a reserved hole on the mud sleeve surface of the iron notch protection plate. The lower edge of the gun nozzle is parallel to the lower edge of the reserved hole of the mud sleeve surface of the protection plate, the upper edge of the gun nozzle is measured to enter the inner length of the protection plate, the steel plate with the same length is cut for sealing use, and the sealing steel plate is welded on the upper edge of the reserved hole of the mud sleeve of the protection plate. And then the upper edge of the reserved phi 420mm steel plate is welded with the sealing steel plate, and the lower edge of the reserved phi 420mm steel plate is welded with the lower edge of the reserved hole of the mud sleeve. The concave portion and the gap are filled with small cement. 4. Adding casting materials: the casting material is used for casting the protective plate and the mud sleeve through a casting opening reserved above the protective plate. When the casting material is used for casting half of the casting material, the positions of the two sides of the protection plate are slightly vibrated by the vibration rod. When the pouring material is poured and filled, the vibrating rod uniformly vibrates, so that the pouring compactness of the pouring material is ensured. 5. Baking: and baking by using gas fire after pouring.
According to the method, for the problem that the integrity of the mud sleeve and the protection plate is poor due to layered casting of the protection plate mud sleeve, the casting method of the mud sleeve protection plate is improved, the integral casting of the tap hole protection plate mud sleeve is realized, gas series flow is eliminated, the stability of the tap hole is improved, and the stable and smooth operation of the blast furnace is ensured.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. The integral pouring method of the taphole mud sleeve protecting plate is characterized by comprising the following steps of: the method comprises the following steps:
Step one: manufacturing a taphole protection plate: selecting a heat-resistant steel plate with the thickness of 10mm-15mm, wherein the heat-resistant steel plate is 1200mm-1300mm in height and 1200mm in width, determining a quadrilateral structure by taking the lower edge of the steel plate as the side length, selecting a round hole with the diameter of 400mm-450mm at the center of the quadrilateral, reserving the round steel plate for standby, and cutting into two parts similar to an inverted trapezoid by taking the lower edge of the steel plate as a reference and an upper angle of 60-80 DEG at the upper position of 200mm-500mm upwards;
Step two: welding a taphole protection plate: the hydraulic gun is operated to rotate to a working surface, after the position of a protective plate is determined at the joint of the hydraulic gun and the plane of the iron notch frame, a positioning pin is fixed at the center of a reserved pin hole, the positioning pin is welded on the iron notch frame, the iron notch protective plate is installed, a fixed pin is tightened, a lower common steel plate is welded, and a pouring grouting port is reserved at the upper edge of the protective plate higher than the upper edge of the iron notch frame;
Step three: making a mud sleeve surface: measuring the length of a hydraulic gun nozzle after the protective plate is welded, turning the hydraulic gun to the position of a reserved hole on the mud sleeve surface of the iron notch protective plate, enabling the lower edge of the gun nozzle to be parallel to the lower edge of the reserved hole on the mud sleeve surface of the protective plate, measuring the length of the upper edge of the gun nozzle entering the protective plate, cutting steel plates with the same length for sealing use, welding the upper edge of the reserved hole on the mud sleeve of the protective plate with a sealing steel plate, welding the upper edge of a round steel plate with the reserved diameter of 400mm-450mm with the sealing steel plate, welding the lower edge of the round steel plate with the reserved hole of the mud sleeve, and filling concave parts and gaps with small cement;
Step four: adding casting materials: the casting material is preserved from the upper part of the protection plate and is cast with the protection plate and the mud sleeve, when the casting material is cast for half, the positions at two sides of the protection plate are vibrated by the vibration rod, when the casting material is cast and fills up, the casting material is inserted into the bottom of the casting material and is stopped for 10-15s and slowly pulled out, the insertion interval is evenly vibrated by 300-400 mm, and the casting compactness of the casting material is ensured;
step five: baking: and after pouring, baking by using gas fire, wherein the gas fire is small for 2-3 hours, the medium fire is medium for 2-3 hours and the large fire is large for 2-3 hours.
2. The method for integrally casting the tap hole mud sleeve protecting plate according to claim 1, which is characterized in that: when the casting material is cast for half, the vibration frequency of the vibration rod is 1000-1500 times/min; when the pouring material is poured and filled, the vibration frequency of the vibration rod is 2000-3000 times/min.
3. The method for integrally casting the tap hole mud sleeve protecting plate according to claim 1, which is characterized in that: step five, the flame length of the medium and small fire is 100-200mm, and the average temperature is 150-180 ℃; the flame length of the medium fire is 200-300mm, the average temperature is 350-380 ℃, and the average temperature of the large fire is 800-900 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410047184.0A CN117921828A (en) | 2024-01-12 | 2024-01-12 | Integral pouring method for iron notch mud sleeve protection plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410047184.0A CN117921828A (en) | 2024-01-12 | 2024-01-12 | Integral pouring method for iron notch mud sleeve protection plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117921828A true CN117921828A (en) | 2024-04-26 |
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ID=90751646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410047184.0A Pending CN117921828A (en) | 2024-01-12 | 2024-01-12 | Integral pouring method for iron notch mud sleeve protection plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117921828A (en) |
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2024
- 2024-01-12 CN CN202410047184.0A patent/CN117921828A/en active Pending
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