Induction furnace with ultra-large smelting amount

Abstract

The induction furnace comprises a furnace body, the furnace body is of a vertical structure and is composed of a furnace cover and a furnace chamber, cooling water pipes are arranged on the furnace body and the furnace cover, the cooling water pipes are fixed on the furnace body and the furnace cover in a welding mode, computer beige white plastic spraying stoving varnish is sprayed on the outer surface of the furnace body after sand blasting, and the outer surface of the furnace body is provided with a water inlet and a water outlet. A cooling water pipe connector is connected with a cooling water system after being led out to the furnace body through a stainless steel pipe in a wall attaching mode, the furnace chamber is in the compact design that a furnace door is arranged on the side of a circular body, the furnace chamber comprises a smelting chamber and a casting chamber, the smelting chamber is in vacuum induction heating, the casting chamber is in vacuum resistance heating, and the position of the smelting chamber corresponds to the position of an opening of a furnace cover. A side opening door is arranged on one side of the casting chamber, the size of an opening of the side opening door meets the requirement that the casting mold with the diameter phi being 480 mm * 320 mm is installed at the pouring position, and the casting mold filled with metal can be taken out of the furnace.

Description

Technical Field

[0001] The utility model belongs to the technical field of smelting furnaces, and particularly relates to an induction furnace with an extremely large melting capacity. Background Technique

[0002] The medium and high frequency induction furnace is a smelting device that uses a medium and high frequency power supply to establish a magnetic field, causing eddy currents to be generated inside ferromagnetic materials and heat up, thereby achieving the heating of materials. It is mainly used for the melting and purification of non-ferrous metals, rare earth metals, and precious metals. The induction furnace is composed of a shell welded by a steel structure, a coil, a yoke, and furnace lining materials. The furnace lining is divided into a coil slurry layer and a working layer. The coil slurry layer is generally corundum-based clay, and the working layer 26 uses heavy bricks or heavy castables, ramming materials, lower vibrating materials, and refractory bricks. There is an insulating layer between the coil slurry layer and the working layer. The temperature inside the furnace rises rapidly to above 1700 °C within a short time, and the metal has a self-stirring process under the action of the electromagnetic field during the smelting process after melting.

[0003] However, during the use process, the stirring device adopted by the medium and high frequency induction furnace body in the prior art is fixed and cannot be replaced. In the use state, in order to achieve different functions, it is necessary to pour the material and replace different containers for operation. During this operation process, due to the requirements of the smelting environment, the molten state of the material is affected, which affects the quality of the finished product. Moreover, in order to ensure uniform heat distribution, a stirring device needs to be used to shorten the melting time, but the existing mechanical stirring method has poor effects.

[0004] At the same time, in the prior art, traditional handling methods are used during the casting mold pouring and transportation, which are time-consuming and laborious, and the production efficiency is low.

[0005] In view of the above factors, an induction furnace with an extremely large melting capacity is specially designed. There are 2 forms additionally arranged at the center of the furnace cover. The first is an electric mechanical stirring device, and the second is a pouring device. The electric stirring device on the furnace cover is detachable when not in use and can be replaced with a pouring device. And a latent AGV with a load of 800 kg is used to realize the operation of the casting mold, and a magnetic nail type guide rail is configured. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an induction furnace with an extremely large melting capacity to solve the problems put forward in the above background technique.

[0007] The purpose of the utility model is realized by the following technical solutions: An induction furnace with an extremely large melting capacity includes a furnace body. The furnace body is of a vertical structure and is composed of a furnace cover and a furnace chamber. Cooling water pipes are arranged on the furnace body and the furnace cover. The cooling water pipes are fixed to the furnace body and the furnace cover by welding. The outer surface of the furnace body is sandblasted and then sprayed with computer off-white spray paint. The cooling water pipe interface is led out to the furnace body by a stainless steel pipe attached to the wall and is connected to the cooling water system;

[0008] The furnace chamber adopts a compact design with a circular main body and a side-opening furnace door. The furnace chamber includes a melting chamber and a casting chamber.

[0009] Furthermore, the melting chamber is heated by vacuum induction, and the casting chamber is heated by vacuum resistance;

[0010] The position of the melting chamber corresponds to the opening position of the furnace lid. A side-opening door is provided on one side of the casting chamber;

[0011] The opening size of the side-opening door is such that a mold with Φ480mm×320mm can be installed in the pouring position and the mold filled with metal can be taken out of the furnace;

[0012] The melting capacity of the furnace chamber is calculated based on the metal liquid density of 16 g / cm3, and its maximum melting capacity is 3000 kg.

[0013] Furthermore, a track is provided on one side of the casting chamber, adopting a form of linear guide rail and rack cooperation. A transplanting mechanism is provided at one end of the track, and the transplanting mechanism can move along the track towards the side-opening door side;

[0014] The transplanting mechanism is arranged on the lifting platform of the lifting machine. The transplanting mechanism includes a transplanting plate and a pushing cylinder connected to the transplanting plate;

[0015] The transplanting plate cooperates with the track fixedly arranged on the rotating platform.

[0016] Furthermore, a turnover and transportation system is provided on the side of the track away from the side-opening door. The turnover and transportation system includes a magnetic nail guide rail and a latent AGV cooperating with the magnetic nail guide rail.

[0017] Furthermore, the bottom of the rotating platform provided on the lifting platform of the lifting machine is controlled to rotate by a rotating shaft;

[0018] The lifting shaft provided at the bottom of the lifting platform of the lifting machine is configured with a POWERBASE by a servo motor to achieve smooth lifting of a large load, and the lifting speed is 0.03 m / s.

[0019] Furthermore, the rotating shaft adopts a slewing bearing configured with a servo motor to achieve steering.

[0020] Furthermore, a vacuum pipeline interface and a camera monitoring window are opened on the furnace chamber. One high-vacuum inflation valve, one automatic air release valve, and one manual air release valve are provided on the vacuum pipeline of the furnace chamber.

[0021] Furthermore, an induction coil cable access port and a temperature measuring thermocouple lead-out interface are provided on the furnace wall of the melting chamber;

[0022] The temperature measuring thermocouple lead-out interface adopts a fixed-sealed terminal form, with a total of 2 sets of terminals, and the temperature measuring thermocouple model is WRe3-WRe25.

[0023] Further, a cable access port and a thermocouple lead-out interface for temperature measurement are provided on the furnace wall of the casting chamber;

[0024] The thermocouple lead-out interface for temperature measurement also adopts the form of fixed sealed terminal posts, with a total of 2 groups of terminal posts. The thermocouple lead-out interface for temperature measurement is located beside the side door, and the type of the thermocouple for temperature measurement is WRe3 - WRe25.

[0025] Further, a stirring device or a pouring device is provided on the furnace cover, and the stirring device or the pouring device is detachably connected to the furnace cover;

[0026] The stirring device adopts the stirring form of a reduction gearbox driving a rotating shaft;

[0027] The stirring rod provided on the stirring device is aligned with the center of the crucible provided in the melting chamber, and the bottom of the crucible is heated by vacuum induction.

[0028] Compared with the prior art, the beneficial effects of the present utility model are:

[0029] In order to facilitate stirring and pouring during use, the present utility model provides a stirring device or a pouring device on the furnace cover, and the stirring device or the pouring device is detachably connected to the furnace cover; the stirring device adopts the stirring form of a reduction gearbox driving a rotating shaft;

[0030] The stirring rod provided on the stirring device is aligned with the center of the crucible provided in the melting chamber, and the bottom of the crucible is heated by vacuum induction;

[0031] The pouring device includes a pouring rod, and the pouring rod is composed of a bottom hollow high-purity graphite rod combined with a hollow stainless steel rod. The pouring rod of the part entering the crucible of the pouring device is in the form of a hollow high-purity graphite pouring rod connected by a stainless steel bellows, which can be twisted in any direction without destroying the vacuum. The rest is hollow stainless steel, and the top is sealed with double-layer quartz glass.

[0032] In the present utility model, the stirring device adopts the stirring form of a reduction gearbox driving a rotating shaft. A Hall switch can also be provided on the rotating shaft to measure the actual rotation speed and perform closed-loop control of the stirring speed with a frequency converter (not shown in the figure). The rotating seal shaft is a hollow water-cooled rigid shaft, combined with mechanical water seal and synchronous belt to achieve water passing and power transmission.

[0033] Among them, the center of the stirring rod of the stirring device is aligned with the center of the melting crucible, and the stirring rod is in a detachable form.

[0034] In the present utility model, there are 2 additional forms provided at the center of the furnace cover. The first is an electric mechanical stirring device, and the second is a pouring device. The electric stirring device on the furnace cover can be detached when not in use and can be replaced with a pouring device. Only one of the stirring device and the pouring device is used in the same furnace batch.

[0035] The utility model realizes turnover transportation. A latent AGV with a load of 800 kg is adopted to realize the operation of the mold, and a magnetic nail type guide rail is configured.

[0036] Center positioning is added to the bottom of the turnover mold. The outer diameter of 480 mm is moved inwards to 320 mm, and the height is 100 mm.

[0037] Moreover, a turnover tray is added during the transportation of the mold, and the turnover tray and the mold are centered. The turnover tray is arranged on the latent AGV. Description of the Drawings

[0038] Figure 1 is a schematic diagram of the main body of the utility model;

[0039] Figure 2 is a schematic plan view of the furnace chamber of the utility model;

[0040] Figure 3 is a schematic diagram of the utility model with a turnover transportation system;

[0041] Figure 4 is a schematic diagram of the transplanting mechanism of the utility model;

[0042] Figure 5 is a schematic diagram of the connection between the furnace chamber and the vacuum pipeline of the utility model;

[0043] Figure 6 is a schematic diagram of the connection between the furnace chamber and the external water cooling system of the utility model;

[0044] Figure 7 is a schematic diagram of the utility model with a temperature measuring thermocouple amplification;

[0045] Figure 8 is a schematic diagram of the utility model with a cable interface amplification;

[0046] Figure 9 is a schematic diagram of the stirring device of the utility model;

[0047] Figure 10 is a schematic diagram of the pouring device of the utility model;

[0048] Figure 11 is a schematic diagram of the furnace body with cooling water pipes of the utility model;

[0049] Figure 12 is a schematic diagram of the AGV and the tray of the utility model;

[0050] Figure 13 is a schematic diagram of the mold arrangement of the utility model;

[0051] Figure 14 is a schematic diagram of the lifting mechanism of the utility model. Detailed implementation mode

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present utility model.

[0053] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0054] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0055] As Figures 1-14 shown, an induction furnace with an ultra-large melting capacity includes a furnace body 1. The furnace body 1 is of a vertical structure and is composed of a furnace cover 2 and a furnace chamber 3. Cooling water pipes are provided on the furnace body 1 and the furnace cover 2, and the cooling water pipes are fixed on the furnace body 1 and the furnace cover 2 by welding. The outer surface of the furnace body 1 is sandblasted and then sprayed with computer off-white plastic spraying paint. The cooling water pipe interface is led out to the furnace body 1 by a stainless steel pipe attached to the wall and is connected to an external cooling water system;

[0056] The furnace chamber 3 adopts a compact design with a circular main body and a side-opening furnace door. The furnace chamber 3 includes a melting chamber 3-1 and a casting chamber 3-2.

[0057] The cooling water system includes a water collecting tank and pipes (not shown in the figure) connected to the water collecting tank, and a circulation pump is provided on the connecting pipes.

[0058] In order to facilitate melting and casting through the furnace chamber in the use state, the melting chamber 3-1 is for vacuum induction heating, and the casting chamber 3-2 is for vacuum resistance heating;

[0059] The casting chamber 3-2 can accommodate six casting molds with dimensions of Φ480mm×320mm. The casting molds are placed on trays, and a control motor is used to drive the trays to successively rotate each casting mold to the pouring position.

[0060] On the stainless steel outer shell of the casting chamber 3-2 on the side facing the melting chamber 3-1, a 20-mm thick hard carbon felt is laid to prevent the outer shell from being damaged by accidental spraying of molten metal.

[0061] The position of the melting chamber 3-1 corresponds to the opening position of the furnace cover 2. A side door 4 is provided on one side of the casting chamber 3-2.

[0062] The opening size of the side door 4 is such that a casting mold with dimensions of Φ480mm×320mm can be installed in the pouring position and a casting mold filled with metal can be taken out of the furnace.

[0063] To facilitate the loading and unloading of casting molds in the operating state, a track 5 is provided on one side of the casting chamber 3-2. A linear guide rail and a rack are used in combination. At one end of the track 5, a transplanting mechanism 7 is provided, and the transplanting mechanism 7 can move along the track 5 towards the side door 4.

[0064] The transplanting mechanism 7 is arranged on the lifting platform of the lifting machine. The transplanting mechanism 7 includes a transplanting plate 7-1 and a linear guide rail 7-2 connected to the transplanting plate 7-1.

[0065] The transplanting plate 7-1 cooperates with the linear guide rail 7-2 fixedly arranged on the rotating platform 7-3.

[0066] When the casting mold is taken out of the casting chamber, after the casting mold is cooled → the vacuum furnace door automatically opens in place → the transplanting mechanism moves to the furnace opening to pick up the material → the transplanting mechanism moves to the transfer position → rotates 90° → flips the casting mold onto the tray of the transfer platform → the transplanting mechanism retracts to make way → the positioning elevator descends in place →

[0067] Call the AGV to pick up the material → the latent AGV arrives at the picking position → the AGV lifts to pick up the material → the AGV transports the casting mold to the finished product warehouse → loop process.

[0068] When the casting mold barrel of the casting chamber enters the furnace, the AGV transports the empty barrel to the positioning elevator → the positioning elevator bilaterally positions and lifts in place → the transplanting mechanism moves to the positioning elevator to pick up the material → rotates 90° → the transplanting mechanism moves to the furnace opening → flips the empty barrel onto the six-station turntable → the transplanting mechanism retracts → loop process.

[0069] To facilitate the turnover and transportation of materials in the operating state, a turnover and transportation system 8 is provided on the side of the track 5 away from the side door 4. The turnover and transportation system 8 includes a magnetic nail guide rail 8-1 and a latent AGV 6 that cooperates with the magnetic nail guide rail 8-1.

[0070] The utility model realizes turnover transportation, adopts a latent AGV with a load of 800kg to realize the operation of the casting mold, and is equipped with a magnetic nail type guide rail.

[0071] A center positioning is added to the bottom of the rotating mold, and the outer diameter of 480mm is moved inward to 320mm, with a height of 100mm.

[0072] In addition, a turnover pallet is added during the transportation of the casting mold, and the turnover pallet and the casting mold are centrally positioned, and the turnover pallet is arranged on the latent AGV.

[0073] The turnover transport system 8 is equipped with a lifting mechanism at the mold placement position. The lifting mechanism is completed by a linear guide rail and a motor-driven screw rod. The lifting mechanism is used to solve the height difference between the AGV and the smelting furnace.

[0074] The lifting mechanism includes symmetrical columns 8-2 with linear guides and motor screws on both sides. The lifting mechanism includes a bracket 8-3, which is detachably matched with the linear guides and the lifting of the bracket 8-3 is achieved by the motor screw. Positioning cylinders 8-8 are arranged on both sides of the symmetrical columns.

[0075] The pallet on the AGV can be moved to the lifting mechanism and positioned by the cylinder.

[0076] In order to facilitate the angular rotation in the use state, the bottom of the rotating platform 7-3 provided on the lifting platform of the elevator is controlled to rotate by a rotating shaft;

[0077] The lifting shaft set at the bottom of the lifting platform of the elevator is equipped with POWERBASE through a servo motor to achieve smooth lifting of large loads with a lifting speed of 0.03m / s.

[0078] In order to facilitate the rotation function of the rotating shaft when in use, the rotating shaft adopts a slewing support bearing and a servo motor to achieve steering.

[0079] In order to facilitate the control of the pressure in the furnace chamber through the vacuum pipe interface during use, a vacuum pipe interface and a camera monitoring window are provided on the furnace chamber 3, and a high vacuum inflation valve, an automatic deflation valve and a manual deflation valve are provided on the vacuum pipe of the furnace chamber 3.

[0080] In order to facilitate the measurement of the temperature in the smelting chamber when in use, an induction coil cable access port and a temperature measuring thermocouple lead-out interface are provided on the furnace wall of the smelting chamber 3-1;

[0081] The temperature measuring thermocouple lead-out interface adopts the form of fixed sealed terminal posts, with a total of 2 sets of terminal posts. The temperature measuring thermocouple models are WRe3-WRe25.

[0082] For facilitating the measurement of the temperature inside the casting chamber during use, a cable access port and a thermocouple lead-out interface for temperature measurement are provided on the furnace wall of the casting chamber 3-2;

[0083] The thermocouple lead-out interface for temperature measurement also adopts the form of fixed sealed terminal posts, with a total of 2 sets of terminal posts. The thermocouple lead-out interface for temperature measurement is located beside the side-opening door 4, and the model of the thermocouple for temperature measurement is WRe3-WRe25.

[0084] For facilitating stirring and pouring operations during use, a stirring device 2-1 or a pouring device 2-2 is provided on the furnace cover 2, and the stirring device 2-1 or the pouring device 2-2 is detachably connected to the furnace cover 2;

[0085] The stirring device 2-1 adopts the form of stirring with a reduction gearbox driving a rotating shaft;

[0086] The stirring rod provided on the stirring device 2-1 is aligned with the center of the crucible provided in the melting chamber 3-1, and the bottom of the crucible is heated by vacuum induction;

[0087] The pouring device 2-2 includes a pouring rod, and the pouring rod includes a combination of a bottom hollow high-purity graphite rod and a hollow stainless steel rod. The pouring rod of the pouring device inside the crucible is in the form of a connection between a hollow high-purity graphite pouring rod and a stainless steel bellows, which can be twisted in any direction without destroying the vacuum. The rest is hollow stainless steel, and the top is sealed with double-layer quartz glass.

[0088] In the present utility model, the stirring device adopts the form of stirring with a reduction gearbox driving a rotating shaft. A Hall switch can also be provided on the rotating shaft to measure the actual rotation speed and perform closed-loop control of the stirring speed with a frequency converter (not shown in the figure). The rotating seal shaft is a hollow water-cooled rigid shaft, combined with mechanical water seal and synchronous belt, to achieve water passing and power transmission.

[0089] Among them, the center of the stirring rod of the stirring device is aligned with the center of the melting crucible, and the stirring rod is in a detachable form.

[0090] Among them, the stirring rod adopts a hollow structure, which can realize stirring and blowing refining simultaneously.

[0091] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0092] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An induction furnace for ultra-large smelting capacity, comprising a furnace body (1), characterized in that: The furnace body (1) is a vertical structure, consisting of a furnace cover (2) and a furnace chamber (3). The furnace body (1) and the furnace cover (2) are provided with cooling water pipes, which are fixed to the furnace body (1) and the furnace cover (2) by welding. The outer surface of the furnace body (1) is sandblasted and then sprayed with computer off-white spray paint. The cooling water pipe interface is a stainless steel pipe that is attached to the wall and led out to the furnace body (1), and is connected to an external cooling water system. The furnace chamber (3) adopts a compact design of a circular main body with a furnace door opened on the side, and the furnace chamber (3) includes a smelting chamber (3-1) and a casting chamber (3-2); The melting capacity of the furnace chamber (3) is calculated based on the molten metal density of 16g / cm3, and its maximum melting capacity is 3000kg.

2. The induction furnace for ultra-large smelting capacity according to claim 1, characterized in that: The smelting chamber (3-1) is vacuum induction heated, and the casting chamber (3-2) is vacuum resistance heated; The position of the smelting chamber (3-1) corresponds to the opening position of the furnace cover (2), and a side door (4) is provided on one side of the casting chamber (3-2); The opening size of the side door (4) is sufficient to allow a casting mold of Φ480mm×320mm to be installed at the pouring position, and the casting mold filled with metal can be taken out from the furnace.

3. The induction furnace for ultra-large smelting capacity according to claim 2, characterized in that: A track (5) is provided on one side of the casting chamber (3-2), and is in the form of a linear guide rail and a rack. A transplanting mechanism (7) is provided at one end of the track (5), and the transplanting mechanism (7) can move along the track (5) toward the side of the side door (4); The transplanting mechanism (7) is arranged on the lifting platform of the elevator, and the transplanting mechanism (7) comprises a transplanting plate (7-1) and a linear guide rail (7-2) connected to the transplanting plate (7-1); The transplanting plate (7-1) cooperates with a linear guide rail (7-2) fixedly arranged on the rotating platform (7-3).

4. The induction furnace for ultra-large smelting capacity according to claim 3, characterized in that: A turnover transport system (8) is arranged on the side of the track (5) away from the side-opening door (4), and the turnover transport system (8) comprises a magnetic nail type guide rail (8-1) and a latent AGV (6) matched with the magnetic nail type guide rail (8-1).

5. The induction furnace for ultra-large smelting capacity according to claim 4, characterized in that: The bottom of the rotating platform (7-3) arranged on the lifting platform of the elevator is controlled to rotate by a rotating shaft; The lifting shaft set at the bottom of the lifting platform of the elevator is equipped with POWERBASE through a servo motor to achieve smooth lifting of large loads with a lifting speed of 0.03m / s.

6. The induction furnace for ultra-large smelting capacity according to claim 5, characterized in that: The rotating shaft adopts a slewing support bearing and a servo motor to realize steering.

7. The induction furnace for ultra-large smelting capacity according to claim 6, characterized in that: The furnace chamber (3) is provided with a vacuum pipeline interface and a video surveillance window, and a high vacuum inflation valve, an automatic deflation valve and a manual deflation valve are arranged on the vacuum pipeline of the furnace chamber (3).

8. The induction furnace for ultra-large smelting capacity according to claim 7, characterized in that: An induction coil cable access port and a temperature measuring thermocouple lead-out interface are arranged on the furnace wall of the smelting chamber (3-1); The temperature measuring thermocouple lead-out interface adopts the form of fixed sealed terminal posts, with a total of 2 sets of terminal posts. The temperature measuring thermocouple models are WRe3-WRe25.

9. The induction furnace for ultra-large smelting capacity according to claim 8, characterized in that: The casting chamber (3-2) is provided with a cable access port and a temperature measuring thermocouple lead-out port on the furnace wall; The temperature measuring thermocouple lead-out interface also adopts the form of fixed sealed terminal posts, with a total of 2 groups of terminal posts. The temperature measuring thermocouple lead-out interface is located next to the side door (4), and the temperature measuring thermocouple model is WRe3-WRe25.

10. The induction furnace for ultra-large smelting capacity according to claim 9, characterized in that: The furnace cover (2) is provided with a stirring device (2-1) or a pouring device (2-2), and the stirring device (2-1) or the pouring device (2-2) is detachably connected to the furnace cover (2); The stirring device (2-1) adopts a stirring form in which a speed reducer drives a rotating shaft; A stirring rod provided on the stirring device (2-1) is aligned with the center of a crucible provided in the smelting chamber (3-1), and the bottom of the crucible is heated by vacuum induction; The pouring device (2-2) comprises a pouring rod, which comprises a bottom hollow high-purity graphite rod combined with a hollow stainless steel rod.

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