CN112024866A - Full-sealed die casting pouring protection device - Google Patents
Full-sealed die casting pouring protection device Download PDFInfo
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- CN112024866A CN112024866A CN202010921255.7A CN202010921255A CN112024866A CN 112024866 A CN112024866 A CN 112024866A CN 202010921255 A CN202010921255 A CN 202010921255A CN 112024866 A CN112024866 A CN 112024866A
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- main body
- die casting
- body support
- argon
- protection ring
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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
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
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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
- B22D41/50—Pouring-nozzles
- B22D41/502—Connection arrangements; Sealing means therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention relates to a fully-sealed die casting pouring protection device, which comprises an argon protection ring (1), a pressure plate component and a visual protective cover component, wherein the argon protection ring (1) is connected with a ladle water outlet through a screwing block (11), the lower end of the argon protection ring extends into a through hole of a top pressure plate (2) of the pressure plate component, and the argon protection ring (1) or the top pressure plate (2) is screwed into a connecting support (21) through a connecting block (12) to realize sealed connection by screwing; the upper end of a main body support (3) of the visual protective cover assembly is hermetically connected with the lower end of the top end pressing plate (2), the side wall of the main body support (3) is provided with an exhaust hole, and the side wall is provided with a visual window (7). The device has simple structure and easy installation, and realizes the full sealing between the lower nozzle of the ladle and the upper pouring gate of the middle injection pipe in the die casting pouring process. The problems that the existing die casting argon protection device cannot form full seal, argon flow cannot form complete shielding, air is easily mixed, secondary oxidation of molten steel is caused, and product quality is influenced are solved.
Description
Technical Field
The invention relates to a full-sealed die casting pouring protection device, and belongs to the technical field of casting equipment.
Background
Die casting is a common way of molten steel pouring flow in the ferrous metallurgy industry. Especially, the die casting cannot be replaced for small-batch, especially for large-thickness and high-strength steel.
The molten steel die casting mostly adopts a down-pouring method: molten steel is poured into a funnel brick above an upper pouring gate of a middle pouring pipe from a lower water gap at the bottom of a ladle, then flows into the bottom of an ingot mold from the bottom of the middle pouring pipe, and finally enters an inner cavity of the ingot mold from the bottom of the ingot mold until reaching a riser. In the molten steel die casting process, a section of space exposed to air is arranged between a lower nozzle at the bottom of a ladle and an upper sprue of a middle injection pipe, and secondary oxidation of molten steel is inevitably caused in the section of space due to contact of injection flow and atmosphere, so that large-particle nonmetallic inclusions in steel ingots are increased, and the purity of the molten steel is influenced. In the sixties of the last century, Ritelle et al studied the factors affecting the oxidation of the cast stream, and the air oxidation products were considered to be the main source of the inclusions in the finished product. Therefore, how to adopt die casting to protect pouring and reduce the N, O gas content and oxide impurities in the steel ingot becomes a main limiting link for restricting the further improvement of the quality of the steel ingot.
The method for protecting injection flow applied in the die casting process of enterprises at home and abroad at present comprises the following steps: (1) an air curtain method: arranging a ring pipe or a breathable refractory material near the lower water gap and introducing Ar gas to form a gas curtain around the injection flow to isolate the atmosphere; (2) a sealing cover method: pouring molten steel of a steel ladle into a tundish, placing the lower part of the tundish into a vacuum chamber for sealing, placing a steel ingot pouring system in the vacuum chamber for pouring, and realizing non-oxidation pouring in a vacuum environment; (3) the refractory fiber protection ring and the air curtain method are characterized in that a refractory material protection ring is arranged on a tundish brick of a central pouring pipe on the basis of the air curtain method, and a gap of 20-50mm is formed between the upper end surface of the protection ring and a lower water gap.
However, in practical use, the above measures are all found to have disadvantages:
the first protection measure has poor protection effect, mainly because argon gas flow cannot form complete shielding effect and is easy to mix with air, secondary oxidation is generated;
although the effect is good by adopting the second protection measure, the equipment is complex, and the cost is higher because the vacuum pumping is needed;
in the third protection measure, although the protection ring is increased, the protection effect is slightly better than that of the first protection measure, air still enters the injection flow area to be contacted with molten steel due to the fact that sealing is still not achieved, and the argon protection effect is not ideal.
Disclosure of Invention
The invention aims to solve the technical problems that the existing die casting argon protection device cannot form full seal, argon flow cannot form complete shielding effect, air is easy to be mixed, secondary oxidation of molten steel is caused, and product quality is influenced.
The technical scheme adopted by the invention for solving the technical problems is as follows: the fully-sealed die casting pouring protection device comprises an argon protection ring, a pressure plate assembly and a visual protective cover assembly, wherein a plurality of screwing blocks are arranged on the outer side wall of the upper part of the argon protection ring at intervals in the circumferential direction, the argon protection ring is connected with a ladle down nozzle through the screwing blocks, and connecting blocks with inclined surfaces at the upper ends are arranged on the side wall of the lower part of the argon protection ring at intervals;
the pressure plate assembly comprises an annular top pressure plate, the section of the inner wall of a through hole of the top pressure plate is of an L-shaped structure, a connecting support with an inverted L-shaped structure is arranged at the through hole of the top pressure plate at intervals, the lower end part of the argon protection ring can extend into the through hole of the top pressure plate and is in contact with the step surface of the inner wall of the through hole of the top pressure plate, and the argon protection ring or the top pressure plate can be rotated to enable the connecting block to be screwed into the connecting support to; the visual protective cover assembly comprises a cylindrical main body support and a visual window, the upper end of the main body support is connected with the lower end of the top pressure plate in a sealing mode, a plurality of exhaust holes are formed in the side wall of the lower end of the main body support, and the visual window is arranged on the side wall of the main body support and is connected with the main body support in a sealing mode.
The device comprises a main body bracket, a plurality of visual windows and a plurality of control devices, wherein the visual windows are arranged on the outer circumferential surface of the main body bracket at regular intervals.
The visual window in the device comprises high-temperature glass and a glass pressing plate, a through hole is formed in the main body support, and the high-temperature glass is connected with the main body support in a sealing mode through the glass pressing plate.
Wherein, in the device, the inner wall of the main body bracket is provided with a refractory fiber protective sleeve.
The device further comprises an annular refractory fiber board, the refractory fiber board is arranged between the top end pressing board and the main body support, and the upper end face and the lower end face of the refractory fiber board are respectively in contact connection with the lower end face of the top end pressing board and the upper end face of the main body support.
The device further comprises an L-shaped limiting block, one end of the limiting block is hinged to the outer side wall of the connecting support, and the inner wall of the bending edge far away from the hinged position can be in contact connection with the small end of the connecting block.
Furthermore, the number of the limiting blocks in the device is at least one, and the limiting blocks are hinged to any connecting support.
Wherein, the lower end surface of the main body bracket in the device is provided with an annular boss.
The number of the connecting blocks in the device is 2-6, and the connecting blocks are uniformly arranged on the same circumferential surface of the outer wall of the argon protection ring.
The number of the connecting supports in the device is 2-6, and the connecting supports are evenly arranged on the end face of the outer edge of the through hole of the top end pressing plate at intervals.
The invention has the beneficial effects that: the device realizes the full sealing between the steel ladle water outlet and the upper pouring gate of the middle pouring pipe in the die casting pouring process; the structure is simple, and the installation is easy; the device is characterized in that a sealing protective cover is arranged between a ladle drain port and an upper pouring gate of a middle pouring pipe to isolate air from entering a pouring space; meanwhile, during work, argon enters from an argon inlet on the argon protection ring, forms an annular gas curtain through the argon protection ring, enters an inner cavity surrounded by the sealing protective cover, forms a gas wall on the periphery of molten steel injection flow, and is discharged from an argon outlet at the bottom of the main body support, so that secondary oxidation of the molten steel is further avoided, air can be effectively prevented from contacting the molten steel, and generation of oxide impurities is greatly reduced; and a plurality of visual windows are arranged on the full-sealed protective cover, and the visual windows are distributed along the circumference, so that a casting worker can observe the injection flow conveniently, and the size and the position of the injection flow are changed according to the field condition. After the device is poured, the N, O content, oxides and other impurities in the die casting finished product can be effectively reduced, the product quality can be effectively improved, and the market share of the product is increased; in addition, the device can effectively reduce the argon consumption, effectively reduce the temperature drop of the pouring molten steel, and has obvious cost reduction and efficiency improvement effect, and the expected economic benefit generated by applying the device is not less than 50 ten thousand yuan/year.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the full-section structure of the present invention;
FIG. 3 is a schematic view of an argon gas guard ring structure of the present invention;
FIG. 4 is a schematic view of the platen assembly of the present invention;
fig. 5 is a schematic structural view of a visual protection cover assembly according to the present invention.
Labeled as: the argon gas protection device comprises an argon gas protection ring 1, a screwing block 11, a connecting block 12, an argon gas inlet 13, a top end pressing plate 2, a connecting support 21, a limiting block 22, a sealing gasket 23, a main body support 3, a refractory fiber protective sleeve 31, an annular boss 32, a hanging ring 33, a funnel brick 4, a molten steel channel 5, a visual window 7, high-temperature glass 8, a glass pressing plate 9 and a refractory fiber plate 10.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 5, the fully-sealed die casting pouring protection device of the invention comprises an argon protection ring 1, a pressure plate component and a visual protective cover component, wherein a plurality of screwing blocks 11 are arranged on the outer side wall of the upper part of the argon protection ring 1 at intervals in the circumferential direction, the argon protection ring 1 is connected with a ladle down nozzle through the screwing blocks 11, and connecting blocks 12 with inclined surfaces at the upper ends are arranged on the side wall of the lower part of the argon protection ring 1 at intervals;
the pressure plate assembly comprises an annular top pressure plate 2, the cross section of the inner wall of a through hole of the top pressure plate 2 is of an L-shaped structure, a connecting support 21 with an inverted L-shaped structure is arranged at the through hole of the top pressure plate 2 at intervals, the lower end part of an argon protection ring 1 can extend into the through hole of the top pressure plate 2 and is contacted with the step surface of the inner wall of the through hole of the top pressure plate 2, and the argon protection ring 1 or the top pressure plate 2 can be rotated to enable a connecting block 12 to be screwed into the connecting support 21 so that the argon; visual safety cover subassembly includes tube-shape main part support 3 and visual window 7, and 3 upper ends of main part support and 2 lower extreme sealing connection of top clamp plate are provided with a plurality of exhaust holes on the 3 lower extreme lateral walls of main part support, visual window 7 sets up on the lateral wall of main part support 3 to with 3 sealing connection of main part support. As can be understood by those skilled in the art, the device comprises an argon protection ring 1, a pressing plate assembly and a visual protective cover assembly, wherein the argon protection ring 1 belongs to the prior art, and the principle is that the argon enters the inside of the argon protection ring 1 mainly by communicating an argon inlet 13 with the outside argon, and a gas wall is formed along the inner wall to achieve the purpose of isolating air and argon input. The device preferably arranges a plurality of screwing blocks 11 at intervals on the outer side wall of the upper part of an argon protection ring 1 in the circumferential direction, so that the argon protection ring 1 is connected with a ladle down nozzle through the screwing blocks 11, and simultaneously, in order to facilitate the connection of the argon protection ring 1 with a pressing plate assembly, preferably arranges connecting blocks 12 with inclined planes at intervals on the side wall of the lower part of the argon protection ring 1, the pressing plate assembly comprises an annular top pressing plate 2, the cross section of the inner wall of a through hole of the top pressing plate 2 is in an L-shaped structure, the lower end of the argon protection ring 1 is mainly convenient to extend into the through hole and then is in contact sealing with the step surface of the inner wall of the through hole, in order to ensure good sealing effect, a sealing gasket 23 is preferably arranged on the step surface, the pre-tightening force of the lower end surface of the argon protection ring 1 and the step surface of the inner hole of the top pressing plate 2 comes, the argon protection ring 1 or the top end pressing plate 2 is screwed, so that the connecting block 12 is screwed into the connecting support 21, the argon protection ring 1 is hermetically connected with the top end pressing plate 2, the inner side wall of the connecting support 21 and the inclined surface at the upper end of the limiting block 22 are preferably rough surfaces, and the friction coefficient can be increased to prevent the argon protection ring 1 from being separated from the top end pressing plate 2; in order to facilitate the argon gas to be discharged and keep the argon gas circulation in the whole device to prevent the pressure build-up from causing the molten steel casting to be unsmooth, a visual protective cover component is preferably arranged on the device and specifically comprises a cylindrical main body support 3 and a visual window 7, the upper end of the main body support 3 is hermetically connected with the lower end of a top end pressing plate 2, a plurality of exhaust holes are formed in the side wall of the lower end of the main body support 3 and mainly used for discharging argon gas, so that the argon gas in the whole device flows, and the influence on the molten steel quality caused by the mixing of air is. Meanwhile, the visual window 7 is arranged on the side wall of the main body support 3 and is connected with the main body support 3 in a sealing mode, so that the pouring flow is observed conveniently by a pouring worker, and the size and the position of the pouring flow are changed according to the field condition. The device is actually arranged between a ladle down nozzle and an upper pouring gate of a middle pouring pipe and used for isolating air from entering a pouring space, argon enters from an argon inlet 13 on an argon protection ring 1 during working, an annular gas curtain is formed through the argon protection ring 1 and then enters an inner cavity defined by a sealing protection cover, a gas wall is formed at the periphery of molten steel pouring flow, and then the molten steel is discharged from an argon outlet at the bottom of a main body support 3.
Preferably, the number of the visual windows 7 in the above device is plural, and the visual windows are uniformly arranged on the outer circumferential surface of the main body bracket 3 at intervals. As will be understood by those skilled in the art, in order to facilitate the observation of the injection flow from different angles, the present device preferably has a plurality of viewing windows 7, which are disposed on the outer circumferential surface of the main body frame 3 at regular intervals
Preferably, in the above device, the viewing window 7 includes a high temperature glass 8 and a glass pressing plate 9, a through hole is opened on the main body support 3, and the high temperature glass 8 is hermetically connected with the main body support 3 through the glass pressing plate 9. As can be understood by those skilled in the art, the device only preferably has the specific structure of the visible window 7, which comprises the high-temperature glass 8 and the glass pressing plate 9, and the main body support 3 is provided with a through hole, so that the high-temperature glass 8 is hermetically connected with the main body support 3 through the glass pressing plate 9. In order to prevent the molten steel sprayed before and after pouring from adhering to the high-temperature glass 8 to affect the observation of field personnel, it is preferable to coat a high-temperature non-stick coating on the inner side wall of the high-temperature glass 8.
Preferably, the inner wall of the main body support 3 in the device is provided with a refractory fiber protective sleeve 31. As can be understood by those skilled in the art, in order to prolong the service life of the main body support 3, the device is preferably provided with a refractory fiber protective sleeve 31 on the inner wall of the main body support 3, the refractory fiber protective sleeve 31 is arranged on the main body support 3, and the upper end surface of the refractory fiber protective sleeve 31 is flanged to cover the whole upper end surface of the main body support 3.
Preferably, the device further comprises an annular refractory fiber plate 10, wherein the refractory fiber plate 10 is arranged between the top end pressing plate 2 and the main body support 3, and the upper end face and the lower end face of the refractory fiber plate 10 are respectively in contact connection with the lower end face of the top end pressing plate 2 and the upper end face of the main body support 3. As can be understood by those skilled in the art, in order to ensure that the lower end face of the top end pressing plate 2 is connected with the upper end face of the main body support 3 in a sealing manner, the refractory fiber plate 10 is arranged between the top end pressing plate 2 and the main body support 3, and the top end pressing plate 2 and the main body support 3 are sealed by extrusion, so that air is effectively prevented from being mixed.
Preferably, the device further comprises an L-shaped limiting block 22, one end of the limiting block 22 is hinged to the outer side wall of the connecting support 21, and the inner wall of the bent edge far away from the hinged position can be in contact connection with the small end of the connecting block 12. The technical personnel in the field can understand, for preventing 2 subassemblies in the working process from taking off, cause the device to seal up not to well influence whole casting, this device sets up stopper 22 function and takes off for preventing 2 subassemblies in the working process from taking off, specifically articulated on linking bridge 21 have the stopper 22 of L shape, rotatory stopper 22 can make stopper 22 keep away from the limit inner wall of bending of articulated department can be connected with the contact of connecting block 12 tip horizontal plane to prevent that the reversal from causing the not hard up influence of junction to use.
Preferably, the number of the limiting blocks 22 in the above device is at least one, and the limiting blocks are hinged on any connecting bracket 21. It can be understood by those skilled in the art that the device is preferably provided with at least one limiting block 22, and the limiting block is hinged to any connecting bracket 21, so that the whole device is simpler in structure and convenient to manufacture. The number of the limiting blocks 22 can be equal to or less than the number of the connecting blocks 12.
Preferably, in the above device, the lower end face of the main body support 3 is provided with an annular boss 32. It will be appreciated by those skilled in the art that the main body support 3 of the apparatus is operatively mounted directly on the hopper brick 4 above the tundish (i.e. the upper sprue of the tundish) and that the apparatus is preferably provided with an annular boss 32 on the lower end face of the main body support 3 for ease of radial location. And is radially positioned by an annular boss 23 at the bottom of the body support 3.
Preferably, in the device, the number of the connecting blocks 12 is 2-6, and the connecting blocks are uniformly arranged on the same circumferential surface of the outer wall of the argon gas protection ring 1. The technical personnel in the field can understand that as long as the connecting block can connect the argon gas protection ring 1 and the top end pressing plate 2, the number of the connecting blocks can be reasonably distributed according to the diameter of the argon gas protection ring 1, the number of the connecting blocks 12 is preferably 2-6, and the connecting blocks 12 are uniformly arranged on the same circumferential surface, namely the connecting blocks 12 are on the same plane, and the included angle between every two of the three is 120 degrees. It may be further preferred that the number of connecting blocks 12 is 3.
Preferably, in the device, the number of the connecting supports 21 is 2-6, and the connecting supports are uniformly arranged on the outer edge end face of the through hole of the top end pressing plate 2 at intervals. It can be understood by those skilled in the art that, in order to facilitate connection with the connecting block 12, the device preferably has the same number of connecting brackets 21 as the connecting block 12, and the connecting brackets 21 correspond to each other one by one, and in the same way, the connecting brackets 21 are uniformly arranged on the same circumferential surface, that is, the connecting blocks 12 are on the same plane, and the included angle between every two of the three is 120 °. It may be further preferable that the number of the connection brackets 21 is 3.
The device comprises the following actual operation steps: 1. the argon protection ring 1 is required to be pre-installed on a down nozzle at the bottom of a ladle through a screwing block 11 before molten steel is contained in the ladle;
2. after a ladle filled with molten steel is vacuumized in a vacuum furnace, firstly, a sealing gasket 23 is arranged on the step surface of an inner hole of a top end pressing plate 2, then, a pressing plate assembly is screwed on an argon protection ring 1 through a connecting support 21, and meanwhile, the sealing gasket 23 is pressed to realize the sealing between the pressing plate assembly and the argon protection ring 1;
3. during pouring, the visual protective cover is required to be placed on the funnel brick 4 above the upper pouring gate of the pouring pipe in advance through the two lifting rings 33 on the main body support 3 of the visual protective cover, and the convex circular ring at the lower part of the main body support 3 of the visual protective cover is sleeved on the upper end of the funnel brick 4, so that the visual protective cover assembly is ensured to be stably and firmly placed; introducing argon into the middle injection pipe and the cavity, and exhausting air in the middle injection pipe and the cavity by using a replacement method;
4. when the ladle moves to the position of the tundish funnel brick 4 of the middle pouring pipe and begins to be poured, the ladle moves downwards, so that the bottom surface of the pressing plate assembly (the lower surface of the refractory fiber plate 10) is in contact with and is tightly pressed against the upper end surface of the visual protective cover, and the sealing between the pressing plate assembly and the visual protective cover assembly is realized; and simultaneously, opening an argon switch communicated with the argon protection ring 1, wherein the introduced argon forms an air wall at the periphery of the molten steel and fills the whole cavity in the sealed protective cover, so that the molten steel is always in a protective atmosphere and begins to be cast during die casting.
Claims (10)
1. Full-sealed die casting pouring protection device, including argon gas protection ring (1), its characterized in that: the argon protection ring is characterized by further comprising a pressing plate assembly and a visual protective cover assembly, wherein a plurality of screwing blocks (11) are arranged on the outer side wall of the upper portion of the argon protection ring (1) at intervals in the circumferential direction, the argon protection ring (1) is connected with a ladle down nozzle through the screwing blocks (11), and connecting blocks (12) with inclined surfaces at the upper ends are arranged on the side wall of the lower portion of the argon protection ring (1) at intervals;
the pressure plate assembly comprises an annular top pressure plate (2), the cross section of the inner wall of a through hole of the top pressure plate (2) is of an L-shaped structure, a connecting support (21) of an inverted L-shaped structure is arranged at the through hole of the top pressure plate (2) at intervals, the lower end part of an argon protection ring (1) can extend into the through hole of the top pressure plate (2) and is in contact with the step surface of the inner wall of the through hole of the top pressure plate (2), and the argon protection ring (1) or the top pressure plate (2) can be rotated to enable a connecting block (12) to be screwed into the connecting support (21) to enable the argon protection ring (; the visual protective cover assembly comprises a cylindrical main body support (3) and a visual window (7), the upper end of the main body support (3) is connected with the lower end of the top end pressing plate (2) in a sealing mode, a plurality of exhaust holes are formed in the side wall of the lower end of the main body support (3), and the visual window (7) is arranged on the side wall of the main body support (3) and is connected with the main body support (3) in a sealing mode.
2. A fully sealed die casting pour protection device according to claim 1, wherein: the number of the visual windows (7) is multiple, and the visual windows are uniformly arranged on the outer circumferential surface of the main body bracket (3) at intervals.
3. A fully encapsulated die casting pouring protection device according to claim 1 or 2, characterized in that: the visual window (7) comprises high-temperature glass (8) and a glass pressing plate (9), a through hole is formed in the main body support (3), and the high-temperature glass (8) is connected with the main body support (3) in a sealing mode through the glass pressing plate (9).
4. A fully sealed die casting pour protection device according to claim 1, wherein: the inner wall of the main body support (3) is provided with a refractory fiber protective sleeve (31).
5. A fully encapsulated die casting draft protection device according to claim 1, wherein: the fireproof fiber plate is characterized by further comprising an annular fireproof fiber plate (10), wherein the fireproof fiber plate (10) is arranged between the top end pressing plate (2) and the main body support (3), and the upper end face and the lower end face of the fireproof fiber plate are respectively in contact connection with the lower end face of the top end pressing plate (2) and the upper end face of the main body support (3).
6. A fully sealed die casting pour protection device according to claim 1, wherein: the connecting device is characterized by further comprising an L-shaped limiting block (22), wherein one end of the limiting block (22) is hinged to the outer side wall of the connecting support (21), and the inner wall of the bending edge far away from the hinged position can be in contact connection with the small end of the connecting block (12).
7. A fully sealed die casting pour protection device according to claim 6, wherein: the number of the limiting blocks (22) is at least one, and the limiting blocks are hinged to any connecting support (21).
8. A fully sealed die casting pour protection device according to claim 1, wherein: an annular boss (32) is arranged on the lower end face of the main body support (3).
9. A fully sealed die casting pour protection device according to claim 1, wherein: the number of the connecting blocks (12) is 2-6, and the connecting blocks are uniformly arranged on the same circumferential surface of the outer wall of the argon protection ring (1).
10. A fully sealed die casting pour protection device according to claim 1, wherein: the number of the connecting supports (21) is 2-6, and the connecting supports are evenly arranged on the end face of the outer edge of the through hole of the top end pressing plate (2) at intervals.
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| CN112024866B (en) | 2021-12-21 |
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