CN116213697B - Ladle casting flow adjustable drainage mechanism and method thereof - Google Patents
Ladle casting flow adjustable drainage mechanism and method thereof Download PDFInfo
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- CN116213697B CN116213697B CN202211726857.2A CN202211726857A CN116213697B CN 116213697 B CN116213697 B CN 116213697B CN 202211726857 A CN202211726857 A CN 202211726857A CN 116213697 B CN116213697 B CN 116213697B
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- drainage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/44—Consumable closure means, i.e. closure means being used only once
- B22D41/48—Meltable closures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Furnace Charging Or Discharging (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses an adjustable drainage mechanism for ladle casting flow and a method thereof. According to the invention, the upper drainage hole, the lower drainage hole, the metal net, the lower sand cylinder and the upper sand cylinder are arranged, so that the lower sand cylinder and the upper sand cylinder are fixed together to form a sand cylinder whole, the auxiliary drainage hole can support the drainage sand wrapped by the soft metal net without sand leakage, compaction is facilitated, the top end of the drainage sand is provided with the bulge, the bulge is higher than the upper surface of the upper sand cylinder, the structure is simplified, the attaching rate of the drainage sand wrapped by the soft metal net without sand leakage to the water gap is improved, the water gap is prevented from being blocked, the drainage effect of the drainage sand to molten steel is improved, blowing drainage is reduced, smooth running of a continuous casting process is ensured, the whole sand cylinder and the drainage sand in the sand cylinder are driven to enter the water gap, the working environment of workers when filling the drainage sand is improved, the operation difficulty of filling is reduced, the operation accuracy and safety of the workers are improved, and the production quality is improved.
Description
Technical Field
The invention relates to the technical field of ladle nozzle drainage, in particular to a ladle casting flow adjustable drainage mechanism and a method thereof.
Background
The large-scale continuous casting process is a process of producing slabs by solidifying molten steel, and a ladle nozzle is required to be continuously opened and closed during a casting operation, and discharge of molten steel is regulated by a (sliding) nozzle or stopper rod installed at an outlet of a tundish.
During the process of supplying molten steel in the tundish to the mold, alumina-type inclusions are present in the molten steel, and fine inclusions not removed by flotation are attached to the inner wall and the discharge gate of the submerged nozzle connecting the tundish and the mold, which become sources of clogging of the submerged nozzle. In order to overcome this problem, the adhesion of inclusions to the inner wall of the submerged nozzle is often inhibited by supplying an inert gas such as argon to the inner wall to form bubbles, and although having an effect of reducing the adhesion of inclusions to the inner wall of the submerged nozzle to some extent, the inhibition of the adhesion of inclusions is limited by, for example, a cooling effect caused by the inert gas, so that the use of the guide sand is often carried out at the nozzle. Molten steel is introduced into a crystallizer through a submerged nozzle, and drainage sand is a ladle bottom steel nozzle filling material. The sliding gate diversion sand is an unshaped refractory material filled in the upper gate of the sliding gate and the steel flowing hole of the upper slide plate. When casting is started, it can make molten steel in ladle flow down.
If no drainage sand is arranged, the molten steel can directly enter the water gap after entering the ladle, so that the molten steel temperature of the water gap is reduced, the water gap is easily solidified at the water gap, the molten steel cannot flow out, in the prior art, the sand bag is directly thrown into the water gap at high altitude by manpower, the light at the water gap is dim and deep, the sand bag is difficult to accurately throw into the water gap, the utilization rate of the drainage sand is low, the blocking probability of the water gap is high, and the drainage effect is to be improved.
Disclosure of Invention
The invention aims to provide a ladle casting flow adjustable drainage mechanism and a ladle casting flow adjustable drainage method, so as to solve the problems in the background technology.
In order to solve the technical problems, the ladle casting flow adjustable drainage mechanism comprises a ladle body, wherein a water gap is formed in the bottom of the ladle body, a sand feeding barrel and a sand discharging barrel are arranged on the inner wall of the water gap, a mounting groove is formed in the inner wall of the top of the water gap, a mounting shoulder matched with the mounting groove is arranged on the outer wall of the top of the sand feeding barrel, a lap groove is formed in the inner wall of the top of the sand feeding barrel, a refractory elbow matched with the lap groove is arranged on the inner wall of the sand feeding barrel, a lap block which is lapped on the lap groove is arranged on the outer wall of the top of the refractory elbow, auxiliary drainage holes which are communicated up and down are formed in the lap block, the upper sand feeding barrel and the inner wall of the sand discharging barrel, two symmetrical auxiliary drainage holes are provided with bolts in threaded connection and are used for connecting the upper sand feeding barrel, the lower sand feeding barrel and the refractory elbow together, gaps are avoided, and an argon blowing pipe is arranged on the inner wall of the ladle body.
Further, an upper drainage hole for downwards flowing molten steel is formed in the inner wall of the refractory elbow, and a lower drainage hole is formed in the inner wall of the lower sand cylinder.
Further, the lower drainage hole is communicated with the upper drainage hole to form a drainage channel, drainage sand for molten steel drainage is arranged on the inner wall of the drainage channel, the drainage sand is wrapped by a soft metal net which cannot leak sand, and the shape of the metal net is matched with the drainage channel.
Further, the inlet end of the argon blowing pipe extends to the outer side of the ladle body and is used for forming a gas circulation channel, and the outlet end of the argon blowing pipe extends to the bottom of the water gap and is used for avoiding steel tapping blockage.
Further, the sand feeding cylinder is made of refractory clay materials, the sand discharging cylinder is made of refractory clay materials, and the auxiliary drainage holes are formed in the sand feeding cylinder.
Further, the upper plane of the fire-resistant elbow is flush with the inner bottom surface of the ladle body, and the bottom end of the sand discharging cylinder extends to the outer side of the ladle body.
Further, the top opening radius of the water gap is larger than the bottom opening radius of the water gap, and the bottom opening radius of the upper drainage hole is equal to the top opening radius of the lower drainage hole.
Further, the upper drainage hole is conical, and the mounting shoulder, the mounting groove, the lapping block, the water gap and the lower drainage hole are coaxial in the vertical direction.
Further, the refractory clay material has a baking bonding flexural strength of more than 0.5MPa and a sintering flexural strength of more than 3MPa after being sintered at 1500 ℃.
The method for the ladle casting flow adjustable drainage mechanism comprises the following specific steps:
The method comprises the steps that firstly, a fire-resistant elbow is fired and connected with an upper sand cylinder, the upper sand cylinder is arranged at the top end of a lower sand cylinder, then an upper drainage hole is aligned with a lower drainage hole, and an auxiliary drainage hole on the inner walls of a lapping block, the upper sand cylinder and the lower sand cylinder is aligned up and down, so that the auxiliary drainage hole is communicated up and down, and the upper drainage hole is communicated with the lower drainage hole up and down to form a drainage channel;
sequentially turning into bolts to fix the sand feeding cylinder and the sand discharging cylinder together to form a sand cylinder whole;
Putting the drainage sand wrapped by the soft metal net without sand leakage into a drainage channel, wherein the auxiliary drainage hole has large upper caliber and small lower caliber, can support the drainage sand wrapped by the soft metal net without sand leakage, compact the drainage sand, and leave a bulge at the top end of the drainage sand, wherein the bulge is higher than the upper surface of the sand feeding cylinder;
Cleaning a water gap, symmetrically penetrating an external traction rope through an auxiliary drainage hole, connecting an external lifting device with the top of the traction rope, driving the sand cylinder to integrally enter the water gap, and seating a mounting shoulder in a mounting groove to enable the mounting shoulder to be matched with the mounting groove;
and fourthly, adding high-temperature molten steel into the ladle body, and after the water gap is opened, accelerating the melting of the sand feeding cylinder, the sand discharging cylinder, the bolts and the metal net, and filling drainage sand in the water gap to promote the molten steel to flow out of the water gap.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, the upper drainage hole, the lower drainage hole, the metal net, the lower sand cylinder and the upper sand cylinder are arranged, so that the lower sand cylinder and the upper sand cylinder are fixed together to form a sand cylinder whole, the auxiliary drainage hole can support the drainage sand wrapped by the soft and sand-leakage-free metal net, compaction of the drainage sand is facilitated, the top end of the drainage sand is provided with the bulge, the bulge is higher than the upper surface of the upper sand cylinder, the structure is simplified, the joint ratio of the drainage sand wrapped by the soft and sand-leakage-free metal net and the water gap is improved, the water gap is prevented from being blocked, the drainage effect of the drainage sand on molten steel is improved, blowing drainage is reduced, smooth running of a continuous casting process is ensured, and by arranging the auxiliary drainage hole, the bolts, the mounting groove and the mounting shoulder, an external traction rope symmetrically penetrates through the auxiliary drainage hole, the external hoisting device is connected with the top of the traction rope, the whole sand cylinder and the drainage sand in the water gap are driven, the working environment when the drainage sand is filled with the drainage sand is improved, the filling operation difficulty of workers is reduced, and the production quality is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of the overall front view of the present invention;
FIG. 2 is a schematic view of a front view of a nozzle according to the present invention;
FIG. 3 is a schematic diagram of the front view of a portion of the present invention;
FIG. 4 is an enlarged view of a portion of the invention at A in FIG. 3;
In the figure, 1, a ladle body, 2, a water gap, 3, a sand feeding cylinder, 4, a sand discharging cylinder, 5, a mounting groove, 6, a mounting shoulder, 7, a lapping groove, 8, a lapping block, 9, a refractory elbow, 10, an auxiliary drainage hole, 11, a bolt, 12, an argon blowing pipe, 13, an upper drainage hole, 14, a lower drainage hole, 15, a drainage channel, 16, drainage sand, 17 and a metal net.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, the present invention provides the following technical solutions: the ladle casting flow adjustable drainage mechanism comprises a ladle body 1, a water gap 2 is arranged at the bottom of the ladle body 1, an upper sand cylinder 3 and a lower sand cylinder 4 positioned at the bottom end of the upper sand cylinder 3 are arranged on the inner wall of the water gap 2, a mounting groove 5 is arranged on the inner wall of the top of the upper sand cylinder 3, a mounting shoulder 6 matched with the mounting groove 5 is arranged on the outer wall of the top of the upper sand cylinder 3, a lapping groove 7 is arranged on the inner wall of the upper sand cylinder 3, a refractory elbow 9 matched with the refractory elbow is arranged on the inner wall of the upper sand cylinder 3, a lapping block 8 is arranged on the outer wall of the top of the refractory elbow 9, auxiliary drainage holes 10 which are communicated up and down are respectively arranged on the inner walls of the upper sand cylinder 3 and the lower sand cylinder 4, bolts 11 which are in threaded connection are arranged on the inner walls of the two auxiliary drainage holes 10, an argon flow pipe 12 is arranged on the inner wall of the ladle body 1, a refractory elbow 9 is arranged on the inner wall of the bottom of the ladle body, a drainage hole 16 is formed by adopting a drainage channel 16 which is formed by the upper sand cylinder 4 and a lower sand cylinder 14, a drainage channel 16 is formed by the drainage channel 16 which is formed by the outer wall of the refractory mortar, and the bottom of the drainage channel 16 is extended from the bottom of the refractory mortar 4, and the drainage channel 16 is formed by the upper and the drainage channel 16 is extended to the outer side of the drainage channel 16, the drainage channel 16 is formed by the drainage channel of the refractory mortar channel 16, and the drainage channel 16 is arranged on the inner wall of the bottom of the drainage channel and the drainage channel 12, the auxiliary drainage holes 10 are formed in the mode that 6 auxiliary drainage holes 10 are formed in the upper plane of the refractory elbow 9 is flush with the inner bottom surface of the ladle body 1, the bottom end of the lower sand cylinder 4 extends to the outer side of the ladle body 1, the top opening radius of the water gap 2 is larger than the bottom opening radius of the lower sand cylinder, the bottom opening radius of the upper drainage hole 13 is equal to the top opening radius of the lower drainage hole 14, the upper drainage hole 13 is conical, the mounting shoulder 6, the mounting groove 5, the lap groove 7, the lap block 8, the water gap 2 and the lower drainage hole 14 are coaxial in the vertical direction, the baking bonding breaking strength of a refractory clay material is larger than 0.5MPa, and the sintering breaking strength of the refractory clay material after being sintered at 1500 ℃ is larger than 3MPa.
The method for the ladle casting flow adjustable drainage mechanism comprises the following specific steps:
The fire-resistant elbow 9 is fired and connected with the upper sand cylinder 3, the upper sand cylinder 3 is arranged at the top end of the lower sand cylinder 4, then the upper drainage hole 13 is aligned with the lower drainage hole 14, and the lapping block 8, the upper sand cylinder 3 and the auxiliary drainage hole 10 on the inner wall of the lower sand cylinder 4 are also aligned up and down, so that the auxiliary drainage hole 10 is communicated up and down, and the upper drainage hole 13 is communicated up and down with the lower drainage hole 14 to form a drainage channel 15;
sequentially turning into 2 bolts 11, and fixing the lower sand cylinder 4 and the upper sand cylinder 3 together to form a sand cylinder whole;
Putting the drainage sand 16 wrapped by the soft and sand-leakage-free metal net 17 into the drainage channel 15, wherein the auxiliary drainage hole 10 has a large upper caliber and a small lower caliber, can support the drainage sand 16 wrapped by the soft and sand-leakage-free metal net 17, compact the drainage sand 16, and the top end of the drainage sand 16 is provided with a bulge which is higher than the upper surface of the sand feeding cylinder 3;
Cleaning a water gap 2, symmetrically penetrating an externally connected traction rope through an auxiliary drainage hole 10, connecting an externally connected lifting device with the top of the traction rope, driving a sand cylinder to integrally enter the water gap 2, and seating a mounting shoulder 6 in a mounting groove 5 to enable the mounting shoulder 6 to be matched with the mounting groove 5;
And fourthly, adding high-temperature molten steel into the ladle body 1, after the water gap 2 is opened, accelerating the melting of the sand feeding cylinder 3, the sand discharging cylinder 4, the bolts 11 and the metal net 17, filling the water gap 2 with drainage sand 16, promoting the molten steel to flow out of the water gap 2, and improving the drainage effect.
The working principle of the invention is as follows:
Referring to the attached drawings 1-4 of the specification, the upper drainage hole 13, the lower drainage hole 14, the metal net 17, the lower sand cylinder 4 and the upper sand cylinder 3 are arranged, so that the lower sand cylinder 4 and the upper sand cylinder 3 are fixed together to form a sand cylinder whole, the auxiliary drainage hole 10 can support the drainage sand 16 wrapped by the soft and sand-leakage-free metal net 17, compaction is facilitated, the top end of the drainage sand 16 is left with a bulge, the bulge is higher than the upper surface of the upper sand cylinder 3, the structure is simplified, meanwhile, the joint rate of the drainage sand 16 wrapped by the soft and sand-leakage-free metal net 17 and the water gap is improved, the water gap is prevented from being blocked, the drainage effect of the drainage sand 16 on molten steel is improved, blowing drainage is reduced, smooth running of a continuous casting process is ensured, an external traction rope symmetrically penetrates through the auxiliary drainage hole 10, a bolt 11, a mounting groove 5 and a mounting shoulder 6, the external traction rope is connected with the top of the traction rope, the whole and the drainage sand 16 in the water gap 2 is driven, the working environment of the worker is improved, the working environment is reduced, the lifting operation is improved, the safety and the lifting quality is improved, and the lifting operation is improved.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited thereto, but may be modified or substituted for some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The method of the ladle casting flow adjustable drainage mechanism comprises a ladle body (1), wherein a water gap (2) is arranged at the bottom of the ladle body (1), an upper sand cylinder (3) and a lower sand cylinder (4) arranged at the bottom end of the upper sand cylinder (3) are arranged on the inner wall of the top of the water gap (2), an installation groove (5) is arranged on the inner wall of the top of the upper sand cylinder (3), an installation shoulder (6) matched with the installation groove (5) is arranged on the outer wall of the top of the upper sand cylinder (3), a lap groove (7) is arranged on the inner wall of the top of the upper sand cylinder (3), a refractory elbow (9) matched with the upper sand cylinder is arranged on the inner wall of the top of the refractory elbow (9), a lap block (8), the upper sand cylinder (3) and the inner wall of the lower sand cylinder (4) are respectively provided with an auxiliary drainage hole (10) which is communicated up and down, two symmetrical auxiliary drainage holes (10) are respectively provided with a connection bolt (11) for connecting the upper sand cylinder (3) with the lower sand cylinder (4), and the refractory elbow (12) and the refractory elbow (1) are prevented from being connected together;
the ladle casting flow adjustable drainage mechanism is characterized by comprising the following steps of:
The method comprises the steps that a fire-resistant elbow (9) is connected with an upper sand cylinder (3) in a firing mode, the upper sand cylinder (3) is arranged at the top end of a lower sand cylinder (4), an upper drainage hole (13) is aligned with a lower drainage hole (14), an overlapping block (8), the upper sand cylinder (3) and an auxiliary drainage hole (10) on the inner wall of the lower sand cylinder (4) are aligned up and down, so that the auxiliary drainage hole (10) is communicated up and down, and the upper drainage hole (13) is communicated with the lower drainage hole (14) up and down to form a drainage channel (15);
Sequentially turning into 2 bolts (11), and fixing the lower sand cylinder (4) and the upper sand cylinder (3) together to form a sand cylinder whole;
Putting drainage sand (16) wrapped by a soft metal net (17) which cannot leak sand into a drainage channel (15), wherein an auxiliary drainage hole (10) is large in upper caliber and small in lower caliber, can support the drainage sand (16) wrapped by the soft metal net (17) which cannot leak sand, is compacted, and the top end of the drainage sand (16) is provided with a bulge which is higher than the upper surface of a sand feeding cylinder (3);
Cleaning a water gap (2), symmetrically penetrating an externally connected traction rope through an auxiliary drainage hole (10), connecting an externally connected lifting device with the top of the traction rope, driving a sand cylinder to integrally enter the water gap (2), and seating a mounting shoulder (6) in a mounting groove (5) to enable the mounting shoulder (6) to be matched with the mounting groove (5);
And fifthly, adding high-temperature molten steel into the ladle body (1), after the water gap (2) is opened, accelerating the melting of the sand feeding cylinder (3), the sand discharging cylinder (4), the bolts (11) and the metal net (17), filling drainage sand (16) into the water gap (2), promoting the molten steel to flow out of the water gap (2), and improving the drainage effect.
2. The method for the ladle casting flow adjustable drainage mechanism, which is disclosed in claim 1, is characterized in that an upper drainage hole (13) for downwards flowing molten steel is formed in the inner wall of the refractory elbow (9), and a lower drainage hole (14) is formed in the inner wall of the lower sand cylinder (4).
3. The method of the ladle casting flow adjustable drainage mechanism according to claim 1, wherein the lower drainage hole (14) and the upper drainage hole (13) are communicated to form a drainage channel (15), drainage sand (16) used for molten steel drainage is arranged on the inner wall of the drainage channel (15), the drainage sand (16) is wrapped by a soft and sand-leakage-free metal net (17), and the shape of the metal net (17) is matched with that of the drainage channel (15).
4. The method for the ladle casting flow adjustable drainage mechanism according to claim 1, wherein the inlet end of the argon blowing pipe (12) extends to the outer side of the ladle body (1) for forming a gas circulation channel, and the outlet end of the argon blowing pipe (12) extends to the bottom of the water gap (2) for avoiding steel tapping blockage.
5. The method for the ladle casting flow adjustable drainage mechanism according to claim 1, wherein the upper sand cylinder (3) is made of refractory clay materials, the lower sand cylinder (4) is made of refractory clay materials, and the number of the auxiliary drainage holes (10) is 6.
6. The method for the ladle casting flow adjustable drainage mechanism according to claim 1, wherein the upper plane of the refractory elbow (9) is flush with the inner bottom surface of the ladle body (1), and the bottom end of the sand discharging cylinder (4) extends to the outer side of the ladle body (1).
7. The method of the ladle casting flow adjustable drainage mechanism according to claim 1, wherein the top opening radius of the water gap (2) is larger than the bottom opening radius of the water gap, and the bottom opening radius of the upper drainage hole (13) is equal to the top opening radius of the lower drainage hole (14).
8. The method of the ladle casting flow adjustable drainage mechanism according to claim 1, wherein the upper drainage hole (13) is conical, and the mounting shoulder (6), the mounting groove (5), the lapping groove (7), the lapping block (8), the water gap (2) and the lower drainage hole (14) are coaxial in the vertical direction.
9. The method for adjusting the ladle casting flow rate and draining the molten steel from the ladle according to claim 5, wherein the refractory clay material has a baking bonding flexural strength of more than 0.5MPa and a sintering flexural strength of more than 3MPa after being sintered at 1500 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211726857.2A CN116213697B (en) | 2022-12-30 | 2022-12-30 | Ladle casting flow adjustable drainage mechanism and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211726857.2A CN116213697B (en) | 2022-12-30 | 2022-12-30 | Ladle casting flow adjustable drainage mechanism and method thereof |
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| CN116213697A CN116213697A (en) | 2023-06-06 |
| CN116213697B true CN116213697B (en) | 2025-05-27 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433477A (en) * | 2013-09-02 | 2013-12-11 | 周宇明 | Combined drainage device for steel ladle casting and manufacturing and use methods thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9418291D0 (en) * | 1994-09-10 | 1994-10-26 | Foseco Int | Improvements in molten metal handling vessels |
| CN103447518B (en) * | 2013-09-02 | 2015-07-15 | 周宇辉 | Lantern-shaped ladle pouring combined drainage plug and manufacturing and setting method |
| CN103433476B (en) * | 2013-09-02 | 2015-07-15 | 周宇辉 | Umbrella-shaped steel ladle casting combination drainage plug and arrangement method |
| JP6021788B2 (en) * | 2013-11-11 | 2016-11-09 | 株式会社神戸製鋼所 | How to improve the ladle natural opening rate |
| JP7165116B2 (en) * | 2019-11-25 | 2022-11-02 | 東京窯業株式会社 | Sliding plate or fixed plate of molten metal discharging device |
| CN115007845B (en) * | 2022-06-15 | 2024-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | A method for filling drainage sand in high-clean steel production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103433477A (en) * | 2013-09-02 | 2013-12-11 | 周宇明 | Combined drainage device for steel ladle casting and manufacturing and use methods thereof |
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