CN218744742U - Induction melting plasma heat-preservation refining device for large-scale ingot casting of titanium and titanium alloy - Google Patents

Abstract

The utility model relates to an ingot casting device, specifically speaking relates to a plasma heat preservation refining titanium and the large-scale ingot casting device of titanium alloy are smelted in response. The smelting and heat-preserving device comprises a smelting and heat-preserving device, a refining device connected with the smelting and heat-preserving device and a casting device connected with the refining device. The utility model adopts the induction skull melting device to melt titanium alloy and adopts a small plasma heat source as a heat preservation heat source for melting titanium alloy, thereby realizing the large capacity of skull melting furnace, greatly reducing the manufacturing cost of large induction melting-plasma heat preservation devices of titanium and titanium alloy, and being provided with a feeding device and a heat preservation device, directly melting the returned material of titanium and titanium alloy, and greatly reducing the cost of raw materials; the continuous casting device can realize continuous operation while feeding, melting, refining and casting, greatly shortens the production period, and greatly improves the production efficiency and the production capacity.

Description

Induction melting plasma heat-preservation refining device for large-scale ingot casting of titanium and titanium alloy

Technical Field

The utility model relates to an ingot casting device, specifically speaking relates to a plasma heat preservation refining titanium and the large-scale ingot casting device of titanium alloy are smelted in response.

Background

Titanium has the advantages of small density, high specific strength, heat resistance, corrosion resistance and good biocompatibility, is widely applied to the fields of aerospace, submarines and ships, chemical electric power, decoration, sports leisure and medicine, and is a novel structural material with the greatest charm in the twenty-first century. The titanium ingot is a blank for processing titanium and titanium alloy, casting is the first process of titanium processing, and the raw materials of titanium and titanium alloy can be further processed into a titanium material after being cast into an ingot.

Currently, equipment for melt casting titanium and titanium alloys includes: a vacuum arc melting device, a vacuum induction melting device, a vacuum electron beam melting device, a plasma melting device, and the like. Wherein, vacuum arc melting device is the most widely used titanium and titanium alloy melting device, and the problem that the device has is: the method has the advantages that the molten pool is shallow, the time for holding the titanium alloy liquid in the liquid state is short, high-density and low-density impurities in the alloy cannot be removed, in order to obtain qualified titanium and titanium alloy ingots, remelting casting needs to be carried out on the ingots for three times, the energy consumption is high, the production flow is long, the production cost is high, and the high-density and low-density impurities in the alloy cannot be effectively removed.

The titanium and titanium alloy induction melting device is a melting device with smaller investment at present, and has the following problems: the device has poor degassing and dehydrogenation effects, and the effect of removing high-density and low-density impurities is not ideal. In particular, the smelting furnace adopts the operation mode of charging → vacuumizing → smelting → casting, so the smelting period is long and the production efficiency is low. In the casting process, the titanium alloy liquid cannot be heated, so that great inconvenience is brought to production operation. The weight of a single cast ingot is small due to the limitation of the capacity of the crucible, and the production requirements of modern processing equipment on large ingot weight, large coil weight and high efficiency cannot be met.

Vacuum electron beam melting and plasma melting are modern emerging titanium and titanium alloy melting technologies, the equipment investment of the two melting devices is extremely large, the investment of a single device exceeds 4 billion yuan RMB due to an electron beam or plasma melting device with a single ingot weighing more than 10 tons. When the vacuum electron beam furnace is adopted to smelt titanium and titanium alloy, the recovery rate of alloy elements with low melting point and high vapor pressure is low, and the metal volatilization loss is extremely large. When the titanium alloy with high aluminum content is smelted, the evaporation loss of aluminum reaches 44 percent; when the titanium alloy containing manganese is smelted, the evaporation loss of manganese can reach 95 percent; when the tin-containing titanium alloy is smelted, the evaporation loss of tin reaches 100%, the component control of the alloy is extremely difficult, and the smelting production cost is extremely high. When the plasma technology is adopted to smelt titanium and titanium alloy, the dehydrogenation and degassing effects are poor, expensive helium gas is required to be used as a smelting medium, and the smelting cost is high. Due to the shortage of helium resources, the purchase cost is high, expensive helium recovery equipment needs to be equipped for the plasma smelting device, the investment reaches about 50% of the investment of the smelting furnace body, and the equipment investment and the production operation cost are increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a plasma heat preservation refining titanium and the large-scale ingot casting device of titanium alloy are smelted in response to the problem of proposing in solving above-mentioned background art.

In order to realize the above-mentioned purpose, the utility model provides a large-scale ingot casting device of plasma heat preservation concise titanium and titanium alloy is smelted in response, including smelting heat preservation device, refining plant, casting device, sealed stove cover, vacuum system and helium recovery unit, it includes feeding device, treats melting furnace charge, response smelting furnace body, response smelting power, smelting furnace transfer nozzle, titanium alloy liquid, autogenous furnace wall and the system of tipping a stove to smelt heat preservation device, refining plant includes first concise plasma gun, the concise plasma gun of second, concise cold bed and concise bed autogenous furnace wall, casting device includes casting heat preservation plasma gun, a pair of water-cooled crystallizer and two the casting machine of water-cooled crystallizer bottom.

As a further improvement of the technical scheme, the smelting heat-insulating device is provided with a feeding device and a heat-insulating device.

As a further improvement of the technical scheme, the smelting heat preservation device further comprises a temperature measuring device and an observation device.

As a further improvement of the technical scheme, the heat preservation device consists of a smelting furnace heat preservation plasma gun, a plasma gun power supply, a plasma loop anode grounding switch, a ground wire, an anode of a plasma heat preservation system and a helium gas source.

As a further improvement of the technical scheme, the refining device divides the integral refining cold bed into a first refining area and a second refining area, and the titanium alloy liquid transferred by the smelting heat-preserving device is refined twice.

As a further improvement of the technical scheme, the casting device is provided with an independent heat preservation heat source.

As a further improvement of the technical scheme, a sealed furnace cover is arranged on the outer side of the smelting heat-insulating device.

Compared with the prior art, the beneficial effects of the utility model are that:

1. in the induction melting plasma heat-preservation refining titanium and titanium alloy large-scale ingot casting device, a small-sized plasma heat source is used as a heat-preservation heat source for melting titanium alloy, so that the large capacity of a skull furnace is realized, the manufacturing cost of the large induction melting-plasma heat-preservation device for titanium and titanium alloy is greatly reduced, a feeding device and a heat-preservation device are arranged, the returned materials of titanium and titanium alloy can be directly melted, and the raw material cost is greatly reduced; the continuous production device can realize continuous operation while feeding, melting, refining and casting, greatly shortens the production period, and greatly improves the production efficiency and the production capacity.

2. In the induction melting plasma heat-preservation refining device for the large-scale ingot casting of titanium and titanium alloy, an independent melting heat-preservation device 1A, an independent refining device 2A and an independent casting device 3A are arranged, the processes of metal melting, melt refining and ingot casting are separated, and high-density and low-density impurities in the alloy are removed through the mechanisms of dissolution, melting, flotation and sedimentation at a refining station.

Drawings

FIG. 1 is a schematic view of an induction melting-plasma thermal insulation apparatus for titanium and titanium alloy according to embodiment 1 of the present invention;

FIG. 2 is a schematic view of an induction melting-plasma insulation-refining apparatus for titanium and titanium alloy according to embodiment 1 of the present invention;

fig. 3 is a schematic view of plasma thermal insulation-refining-casting process of a large titanium and titanium alloy casting device according to embodiment 1 of the present invention.

The various reference numbers in the figures mean:

1A, a smelting heat preservation device; 1. a feeding device; 2. a charge to be melted; 3. an induction melting furnace body; 4. an induction melting power supply; 5. a transfer nozzle of the smelting furnace; 6. titanium alloy liquid; 7. autogenous furnace lining; 8. a turndown system; 9. a smelting furnace heat preservation plasma gun; 10. a plasma gun power supply; 11. a plasma loop anode grounding switch; 12. a ground line; 13. an anode of the plasma thermal insulation system; 14. a helium gas source; 15. a vacuum system; 16. a helium recovery unit; 17. sealing the furnace cover; 18. a temperature measuring device; 19. an observation device; 2A, a refining device; 20a, a first refining plasma gun; 20b, a second refining plasma gun; 20c, a first refining zone; 20d, a second refining zone; 21. a refining cooling bed; 22. a self-generated furnace lining of a refining bed; 3A, a casting device; 23. casting a heat-preservation plasma gun; 24. a water-cooled crystallizer; 24a, refining and purifying the alloy liquid to be cast for the second time; 25. a casting machine; 26. and (5) ingot casting.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Example 1

Referring to fig. 1-3, the utility model provides an induction melting plasma heat-preservation refining titanium and titanium alloy large-scale ingot casting device, which comprises a melting heat-preservation device 1A, a refining device 2A, a casting device 3A, a sealed furnace cover 17, a vacuum system 15 and a helium recovery device 16, wherein the melting heat-preservation device 1A comprises a feeding device 1, a furnace charge 2 to be melted, an induction melting furnace body 3, an induction melting power supply 4, a melting furnace transfer nozzle 5, titanium alloy liquid 6, a self-generating furnace lining 7 and a tilting system 8, the melting heat-preservation device 1A melts titanium alloy by the induction melting furnace body 3, a melting furnace heat-preservation plasma gun 9 is used as a heat-preservation heat source for melting titanium alloy, the capacity of a skull furnace is realized, the manufacturing cost of the titanium and titanium alloy large-scale melting device is greatly reduced, the induction melting furnace body 3 comprises copper tubes, adjacent copper tubes are mutually insulated, water cooling is conducted inside the copper pipe, the crucible bottom is of an integral cake-shaped structure and is made of one of T2, TP2 and TU2, the crucible wall is connected with a cooling water channel arranged at the bottom of the crucible, the water quality of the cooling water is industrial soft water, mineral substances dissolved in the water are prevented from precipitating and scaling to block a pipeline, an induction melting power supply 4 of an induction skull melting device 3 is an intermediate frequency power supply, when the induction melting power supply 4 supplies power to the induction melting furnace body 3, alternating current flows through a crucible induction coil, induced current is generated in the cross section of each copper pipe forming the crucible, due to the effect of the proximity effect of the current, a strengthened alternating electromagnetic field is formed in a metal melt 6 at the middle part of the induction melting furnace body 3, the furnace burden is promoted to be rapidly melted, when the induction melting furnace body 3 melts titanium and titanium alloy furnace burden through the gap effect and the proximity effect, water is introduced to the wall and the bottom of the crucible for cooling, titanium and titanium alloy furnace burden in the middle of the induction smelting furnace body 3 is melted into metal melt 6, a self-generated furnace lining 7 of a titanium alloy skull is formed between the wall of the crucible and the titanium alloy liquid 6, when the titanium and titanium alloy furnace burden is melted by a gap effect and a proximity effect for preventing the titanium alloy liquid 6 from being polluted by a furnace lining copper pipe, water is introduced to the wall and the bottom of the crucible for cooling, the titanium and titanium alloy furnace burden in the middle of the induction smelting furnace body 3 is melted into metal melt, and the self-generated furnace lining 7 of the titanium alloy skull is formed between the wall of the crucible and the titanium alloy liquid 6 for preventing the titanium alloy liquid 6 from being polluted by the furnace lining copper pipe;

the refining device 2A comprises a first refining plasma gun 20a, a second refining plasma gun 20b, a refining cold bed 21 and a refining bed autogenous furnace lining 22, the integral refining cold bed 21 is arranged to refine the titanium alloy liquid 6 transferred from the smelting heat-insulation device 1A, the refining bed autogenous furnace lining 22 is formed on the surface of the refining cold bed 21 due to the influence of the water cooling effect of the refining cold bed 21, and the titanium alloy liquid is prevented from being polluted by the matrix metal of the cold bed;

the casting apparatus 3A includes a casting heat-retaining plasma gun 23, a pair of water-cooled molds 24, and a casting machine 25 at the lower ends of the two water-cooled molds 24.

In the embodiment, the smelting heat-insulating device 1A is provided with the feeding device 1 and the heat-insulating device, so that the titanium and titanium alloy returns can be directly smelted, and the cost of raw materials is greatly reduced; the continuous operation of feeding and smelting can be realized while feeding and smelting, conditions are created for the continuous operation of subsequent continuous refining, continuous casting and the continuous operation of the whole device, the production period is greatly shortened, and the production efficiency and the production capacity are greatly improved.

Further, the smelting heat preservation device 1A also comprises a temperature measuring device 18 and an observation device 19, and the smelting temperature can be controlled, so that the alloy liquid is in a high-temperature state for a long time, the refractory alloy elements are fully dissolved, and the homogenization of the alloy components and the temperature in the induction smelting crucible is facilitated. The method is convenient for a smelting operator and a smelting process engineer to observe the alloy smelting condition, control the progress of the alloy smelting process and check the melt quality of the smelted alloy.

Specifically, the heat preservation device comprises a smelting furnace heat preservation plasma gun 9, a plasma gun power supply 10, a plasma loop anode grounding switch 11, a ground wire 12, an anode 13 of a plasma heat preservation system and a helium gas source 14, wherein the plasma gun power supply 10 provides an operation power supply, a gas ionization and high-frequency emission power supply for the smelting furnace heat preservation plasma gun 9, the helium gas source 14 provides a helium medium required by plasma generation for the plasma gun 9, and before the heat preservation plasma gun 9 of the smelting heat preservation device 1A is put into operation, the plasma loop anode grounding switch 11 is firstly switched on, so that the plasma gun 9, the plasma gun power supply 10, the plasma loop anode grounding switch 11, the ground wire 12 and the anode 13 of the plasma heat preservation system form a loop.

In addition, the refining device 2A divides the integral refining cold bed 21 into a first refining area 20c and a second refining area 20d, the titanium alloy liquid 6 transferred by the melting and heat preservation device 1A is refined twice, when the melting and heat preservation device 1A finishes the process of melting titanium and titanium alloy, the tilting furnace system 8 tilts the induction smelting furnace body 3 to transfer the titanium alloy liquid 6 to the refining cold bed 21, the transferred titanium alloy liquid 6 is sequentially heated and heated by the first refining plasma gun 20a and the second refining plasma gun 20b in the first refining area 20c and the second refining area 20d, the superheat degree of the alloy liquid in the refining process is ensured, the gas and low-melting-point impurities in the alloy liquid are removed through high temperature and vacuum, the low-melting-point alloy element burning loss is controlled through regulating furnace pressure, high-density and low-density impurities in the alloy liquid are melted and dissolved, the high-density impurities which cannot be fully melted and removed in the metal liquid are solidified into a self-producing furnace lining 22 of the refining bed, and are prepared for casting in a crystallizer 24a after secondary refining.

In addition, the casting device 3A is provided with an independent heat-preservation heat source, the casting heat-preservation plasma gun 23 is used for preserving heat of the titanium alloy liquid 24a, the water-cooled crystallizer 24 is used for cooling the alloy liquid 24a to be cast after secondary refining and purification to form an ingot 26, the casting machine 25 is used for leading the ingot 26 out of the crystallizer 24, so that a round ingot can be cast, a special-shaped ingot can be cast, the process requirements of the next procedure are met, the ingot forming process is completed, the autogenous furnace lining layer of the smelting device is taken out, alloy varieties can be rapidly converted, and the device has the advantages of convenience in alloy variety conversion, simplicity and convenience in operation, short smelting period, high production efficiency, low production cost and small equipment investment.

Specifically, a sealed furnace cover 17 is arranged on the outer side of the smelting heat preservation device 1A, the sealed furnace cover 17 is of an integral sealing structure, a furnace chamber is vacuumized through a vacuum system 15, helium is backflushed through a helium gas source 14, the pressure in the smelting chamber can be adjusted between 0.1 KPa and 304KPa, and the furnace pressure can be adjusted through helium flowing. When the furnace pressure is controlled at the bottom limit, the degassing of titanium and titanium alloy liquid is facilitated, and the quality of alloy melt is improved. When the furnace pressure is controlled at a high limit, the titanium alloy containing the alloy elements with lower melting point and higher vapor pressure is favorably smelted, and the metal volatilization loss in the smelting process is reduced.

Furthermore, the device is provided with an independent smelting heat preservation device 1A, an independent refining device 2A and an independent casting device 3A, the metal melting, melt refining and ingot casting processes are separated, and the production process of feeding, melting, refining and casting is adopted, so that the whole system realizes continuous operation, the production period is greatly shortened, the production efficiency and the production capacity are greatly improved, all existing brands of titanium and titanium alloy can be smelted, the metallurgical quality of the titanium and the titanium alloy can be greatly improved, the production efficiency of smelting and casting is improved, and the production cost is reduced.

Furthermore, the heat source for heat preservation and refining of the induction melting-plasma heat preservation refining titanium and titanium alloy large ingot casting device can be a plasma gun heat source or a high-energy electron beam gun heat source, and when the plasma gun heat source is adopted, the medium gas can be helium or argon.

When the induction melting plasma heat-preservation refining device for large ingots of titanium and titanium alloys is used specifically, granular titanium sponge and blocky alloy raw materials are loaded into the induction melting device body 3, when the materials are loaded, the influence of skin effect and ring effect on the temperature of different areas in the furnace is considered, the titanium and alloy elements are ensured to be melted simultaneously, low-melting-point alloy elements such as aluminum, antimony, lead and manganese are generally loaded in the middle of the crucible, and the titanium materials are loaded near the inner wall close to the crucible.

After the furnace is charged, the furnace is closed, a vacuum system 15 and a back-flushing helium system 14 are started to vacuumize the melting chamber, back-flushing helium is fed into the furnace chamber to dilute the air in the furnace, then the furnace is vacuumized again to meet the process pressure requirement, a water cooling is fed into an induction melting device body 3, an induction melting power supply 4 is started to melt, the melting temperature is monitored and controlled through a temperature measuring device 18 in the melting process, the melting process is observed through an observation device 19, when the aluminum-containing titanium alloy is melted, the influence of the heat release effect when the metals are melted mutually on the melting temperature and a self-generating furnace lining 7 is considered, a stepped loading mode is adopted after degassing, and the temperature is slowly increased and heated. When the alloy elements with low melting point and high vapor pressure are smelted, the blast furnace pressure can be adjusted to reduce the loss of the alloy elements. When the aluminum-containing alloy is smelted, the temperature rise speed is controlled, after the central aluminum furnace material is completely melted and alloyed, the smelting power is rapidly increased, the electromagnetic stirring is enhanced, the material melting speed is increased, and after the furnace material is completely melted.

Before the heat-preservation plasma gun 9 of the smelting heat-preservation device 1A is put into operation, the plasma loop anode grounding switch 11 is firstly switched on, so that the plasma gun 9, the plasma gun power supply 10, the plasma loop anode grounding switch 11, the ground wire 12 and the anode 13 of the plasma heat-preservation system form a loop. The scattered titanium alloy returns are added into the induction melting furnace body 3 through the feeding device 1, the returns are melted by the plasma gun 9, and the heat of the titanium alloy liquid 6 is preserved.

The tilting system 8 is started to ensure that the induction melting furnace body 3 transfers the titanium alloy liquid 6 to the refining cold hearth 21. The titanium alloy liquid 6 is heated and heated by the first refining plasma gun 20a and the second refining plasma gun 20b in the first refining area 20c and the second refining area 20d in sequence, gas and low-melting-point impurities in the alloy liquid are removed through high temperature and vacuum, and the burning loss of low-melting-point alloy elements is controlled through regulating furnace pressure. By controlling the smelting temperature and the heat preservation time, high-density and low-density impurities in the alloy liquid are melted and dissolved, high-density impurities which cannot be sufficiently melted and dissolved and removed are solidified into a self-generating furnace lining 22 of a refining bed through sedimentation, and the alloy liquid 24a after secondary refining and purification is transferred into a crystallizer 24.

The plasma gun 23 arranged in the casting device 3A keeps the temperature of the titanium alloy liquid 24a, the crystallizer 24 cools the alloy liquid 24a to form an ingot 26, and the ingot 26 is led out from the crystallizer 24 by the traction device 25 to finish the ingot forming process.

The small plasma heat source is used as a heat-preservation heat source for melting titanium alloy, the capacity enlargement of an induction melting-plasma heat-preservation refining device is realized, the manufacturing cost is greatly reduced, the feeding device 1 and the heat-preservation device are arranged, titanium and titanium alloy returns can be directly melted, and the raw material cost is greatly reduced; the continuous production device can realize continuous operation while feeding, melting, refining and casting, greatly shortens the production period, and greatly improves the production efficiency and the production capacity. An independent smelting heat preservation device 1A, an independent refining device 2A and an independent casting device 3A are arranged, and the metal melting, melt refining and ingot casting processes are separated. The refining station removes high-density and low-density impurities in the alloy through dissolution, melting, flotation and sedimentation mechanisms; the device realizes the removal of helium and gas in alloy liquid by adjusting the furnace pressure of a refining zone, and has the advantages of arc melting, induction melting, plasma and electron beam melting technology, large-scale titanium and titanium alloy casting equipment, equipment investment of only one fifth of that of the single large casting equipment, capability of melting all existing brands of titanium and titanium alloys, capability of greatly improving the metallurgical quality of the titanium and titanium alloys, capability of improving the production efficiency of melting and casting, reduction of the production cost, capability of quickly converting alloy varieties by taking out a autogenous furnace lining layer, convenience in alloy variety conversion and simplicity and convenience in operation. Can realize continuous operation of feeding, melting, refining and casting, simplify the production process and shorten the process flow.

The foregoing shows and describes the basic principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (4)

1. The utility model provides a large-scale ingot casting device of refined titanium of induction melting plasma heat preservation and titanium alloy, is including smelting-heat preservation device (1A), refining device (2A), casting device (3A), vacuum system (15) and helium recovery unit (16), its characterized in that: the smelting-heat-preserving device (1A) comprises a feeding device (1), furnace materials (2) to be smelted, an induction smelting furnace body (3), an induction smelting power supply (4), a smelting furnace transfer port (5), titanium alloy liquid (6), a self-generating furnace lining (7) and a tilting system (8), the refining device (2A) comprises a first refining plasma gun (20 a), a second refining plasma gun (20 b), a refining cold bed (21) and a refining bed self-generating furnace lining (22), and the casting device (3A) comprises a casting heat-preserving plasma gun (23), a pair of water-cooling crystallizers (24) and casting machines (25) at the bottom ends of the two water-cooling crystallizers (24);

the refining device (2A) divides the integral refining cold bed (21) into a first refining area (20 c) and a second refining area (20 d), and the titanium alloy liquid (6) transferred into the smelting-heat preserving device (1A) is refined twice in the first refining area (20 c) and the second refining area (20 d);

the casting device (3A) is provided with an independent heat-preservation heat source, and the casting heat-preservation plasma gun (23) is used for preserving heat of the titanium alloy liquid (24 a).

2. The induction melting plasma heat-preserving large-scale titanium and titanium alloy ingot casting device according to claim 1, characterized in that: the smelting-heat-preserving device (1A) also comprises a temperature measuring device (18) and an observing device (19).

3. The induction melting plasma heat-preservation refining device for large titanium and titanium alloy ingots according to claim 1, characterized in that: the heat preservation device consists of a smelting furnace heat preservation plasma gun (9), a plasma gun power supply (10), a plasma loop anode grounding switch (11), a ground wire (12), an anode (13) of a plasma heat preservation system and a helium gas source (14).

4. The induction melting plasma heat-preserving large-scale titanium and titanium alloy ingot casting device according to claim 2, characterized in that: and a sealed furnace cover (17) is arranged on the outer side of the smelting-heat-preserving device (1A).

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