CN214665983U - Smelting device for preparing high-cleanliness magnesium or magnesium alloy melt - Google Patents
Smelting device for preparing high-cleanliness magnesium or magnesium alloy melt Download PDFInfo
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Abstract
The utility model discloses a device of smelting of preparation high cleanliness factor magnesium or magnesium alloy fuse-element belongs to metal smelting technical field. The device comprises a melting furnace, a stirring device, a temperature control system, a vacuum system, an inflation pressurization system, a purification furnace and a melt transfer device; smelting magnesium or magnesium alloy in a melting furnace, adopting sealed and protective atmosphere to prevent magnesium or magnesium alloy melt from burning or excessively oxidizing, and adopting a special device to fully stir the melt to obtain magnesium or magnesium alloy melt with uniform chemical components; the homogeneous melt is automatically conveyed into a purification crucible of a purification furnace through a melt transfer device, the melt is dispersed and distributed after passing through a purification medium layer, and impurities are removed; the clean and homogeneous melt is subjected to subsequent operation procedures. The utility model abandons the traditional magnesium alloy flux smelting mode, realizes the high purification of magnesium or magnesium alloy melt, and obviously reduces the environmental pollution and the operation difficulty of workers in the smelting process; can be continuously and automatically produced, and has high production efficiency.
Description
Technical Field
The utility model relates to a metal smelting and the technical field who purifies, concretely relates to prepare high cleanliness magnesium or magnesium alloy's smelting device.
Background
Magnesium or magnesium alloys have been rapidly developed in the industries of electronic products, transportation, aerospace, weapon manufacturing and the like due to a series of excellent characteristics of small density, high specific strength, strong electromagnetic shielding, high damping and shock absorption properties, excellent heat conductivity, high dimensional stability, excellent casting properties, good processability, abundant reserves and the like.
However, the smelting and purifying process for producing bearing structure castings (such as aerospace parts) with high requirements on internal metallurgical quality is mainly a flux method. The basic process is to use a smelting furnace to complete the operations of melting, alloying and refining of raw materials. The smelting and alloying processes need to be protected by covering flux to prevent excessive oxidation and even burning of the raw materials. During refining operation, while stirring the melt, scattering flux powder on the surface of the melt; the flux is melted when encountering the high temperature magnesium melt, and the melted flux is contacted with and captured by the non-metallic inclusions. And keeping the temperature and standing after the melt is refined. In the process of heat preservation and standing, the density of the nonmetallic inclusion wrapped by the flux is higher than that of the magnesium alloy melt, the nonmetallic inclusion slowly settles to the lower part of the melt, and the settling process usually takes about thirty minutes. And pouring after the heat preservation and the standing are finished. Because the capture degree of the inclusions in the purification process is closely related to the distribution and movement conditions of flux droplets in the magnesium alloy melt, the removal of the inclusions has greater randomness; and the density of the non-metallic inclusion formed in the smelting process is closer to that of the magnesium melt, and the micro-scale inclusion is difficult to completely eliminate by standing. In addition, the internal disturbance of the melt caused in the subsequent casting process can cause the settled impurities to float again, and the caused liquid level disturbance can also cause the damage of the flux protective layer on the surface of the melt, so that the melt is oxidized again, and the damaged flux layer can settle to pollute the magnesium melt. Therefore, it is difficult to obtain a magnesium alloy melt with high cleanliness by this production process. In addition, a large amount of flux is required to be added in the smelting and purifying processes, so that the environment pollution is caused, and the working environment of workers is severe.
At present, a fluxless smelting method for producing magnesium alloy castings is only used for a die casting process, prefabricated master alloy ingots are added in a melting chamber for remelting, stirring operations such as alloying and refining are not needed, and the liquid level can be basically kept static without disturbance; the flame retardant protection of the whole crucible is usually realized by adopting mixed gas containing sulfur hexafluoride; the simple die-casting crucible has the structure that the melt is purified by natural settling or floating of the gravity of the inclusion only by utilizing the characteristic that the density of the inclusion in the magnesium or magnesium alloy melt is different from that of the magnesium melt; besides the purification mode, the complicated die-casting crucible is also provided with a filter plate with holes for filtration and purification; the melting crucible structure is close to quasi-closed, so that the environmental pollution is light; workers do not need special smelting skills and special training. However, the impurities suspended in the magnesium alloy melt are more and have a density difference with the melt, and the impurities with small sizes are not completely removed only by means of natural sedimentation, floating or filtration by gravity, so that the impurities in the die casting product are more and can only be used for non-structural civil parts without bearing force.
The processes include solvent method and non-solvent smelting method, which can not completely eliminate the inclusion in the magnesium or magnesium alloy melt. Recently, there are several devices to solve this problem.
Chinese patent No. 201610196892.6 discloses a multi-furnace combined casting apparatus and process for producing high-cleanliness magnesium or magnesium alloy. However, in the smelting process, partial solvent is required to be used for protecting the magnesium alloy melt, the degree of mechanization and automation is not high, and the capability of vacuum smelting and protective gas use is not available.
Chinese patent No. 201710059780.0 discloses a magnesium alloy melt continuous liquid supply purification device and a purification process. However, it cannot prepare a vacuum environment in advance during the smelting process.
At present, aiming at a smelting device for producing high-cleanliness magnesium or magnesium alloy, full-mechanized, automatic and solvent-free smelting cannot be realized. The alloy smelting device aiming at magnesium or magnesium alloy with high inclusion removal rate and environmental protection is urgently needed to be developed.
SUMMERY OF THE UTILITY MODEL
The above-mentioned weak point that exists to present smelting magnesium or magnesium alloy, the utility model provides a prepare device of smelting of high cleanliness factor magnesium or magnesium alloy fuse-element has realized magnesium or magnesium alloy fuse-element high purification, is showing the environmental pollution who has reduced in the smelting process and workman's the operation degree of difficulty.
In order to achieve the above object, the utility model adopts the following technical scheme:
a smelting device for preparing magnesium or magnesium alloy melt with high cleanliness comprises a melting furnace, a purifying furnace, a vacuum system, an inflation pressurization system and a melt transfer device, wherein:
melting furnace: the melting furnace is used for melting magnesium or magnesium alloy, homogenizing chemical components and controlling temperature;
a purification furnace: the device comprises a purification crucible, a resistance furnace and a liquid outlet pipe, wherein a purification medium layer is arranged in the purification crucible; the purifying furnace is used for purifying the magnesium or magnesium alloy melt to remove impurities;
a temperature control system: the device is used for monitoring and controlling the temperature in the melting process of the melting crucible and the purification crucible;
a vacuum system: the method is used for obtaining the vacuum atmosphere when the melting crucible is melted;
an inflation pressurization system: the magnesium or magnesium alloy conveying device is used for providing pressure for conveying magnesium or magnesium alloy between the melting furnace and the purifying furnace and providing protective gas for the inner cavity of the melting crucible;
a melt transfer device: the melting furnace and the purifying furnace are communicated through a melt transfer device and used for conveying magnesium or magnesium alloy melt from the melting furnace to the purifying furnace.
A melting crucible cover plate is arranged at the top of the melting crucible, and a closed inner cavity isolated from the external environment is formed between the melting crucible and the melting crucible cover plate after the melting crucible cover plate is covered; a temperature measuring device and a stirring device are arranged in the melting crucible, the temperature measuring device is a thermocouple, and the thermocouple is connected with a temperature control system; the lower end of the thermocouple penetrates through the melting crucible cover plate and extends into the magnesium or magnesium alloy melt in the melting crucible; the stirring device comprises a rotating shaft, the rotating shaft is arranged on the melting crucible cover plate, the upper end of the rotating shaft is connected with a motor and is driven by the motor to rotate, the lower end of the rotating shaft is provided with stirring blades for stirring magnesium or magnesium alloy melt, and the number of the stirring blades is greater than 1.
A purification crucible cover plate is arranged at the top of the purification crucible, and a closed inner cavity isolated from the external environment is formed between the purification crucible and the purification crucible cover plate after the purification crucible cover plate is covered; a temperature measuring device is arranged in the purification crucible, the temperature measuring device is a thermocouple, and the thermocouple is connected with a temperature control system; the lower end of the thermocouple penetrates through the cover plate of the purification crucible and extends into the magnesium or magnesium alloy melt in the purification crucible; the upper end of the liquid outlet pipe extends out of the purification crucible cover plate, and the lower end opening of the liquid outlet pipe is higher than the purification medium layer.
The vacuum system comprises at least one vacuum pump, and the vacuum pump is communicated with the melting crucible through a conduit II.
The inflation pressurization system comprises at least one protective gas supply device, and the protective gas supply device is communicated with the melting crucible through a conduit I.
The melt transfer device comprises a riser tube, a downcomer and a heat preservation pipeline, wherein the lower end of the riser tube penetrates through the melting crucible cover plate and extends into the melting crucible, and the lower end of the downcomer penetrates through the purifying crucible cover plate and extends into a purifying medium in the purifying crucible; the riser pipe and the downcomer are communicated through a heat preservation pipeline.
The lower opening of the liquid outlet pipe in the purification crucible is positioned above the lower port of the downcomer in the purification crucible.
The smelting process for preparing the magnesium or magnesium alloy melt with high cleanliness by using the smelting device comprises the following steps:
(1) adding magnesium ingots or magnesium alloy into a crucible in a melting furnace to prepare raw materials, and controlling the temperature of the melting crucible to be between room temperature and 1000 ℃; opening a vacuum system, and pumping out air in the crucible; introducing protective gas through an inflation pressurization system, starting a stirring device to start stirring and smelting after the magnesium ingot is melted, and obtaining a melt which is melted and uniformly stirred;
(2) controlling the temperature of a purification crucible with a purification medium layer to be between room temperature and 900 ℃;
(3) increasing the air pressure in the melting crucible through an air inflation pressurization system, and conveying the magnesium or magnesium alloy melt in the melting crucible into a purification crucible through the melt transfer device; the melt is fully dispersed and distributed and purified in the process of passing through the purification medium, then under the action of buoyancy, the clean melt is gathered at the upper part of the purification crucible, and can be directly used for pouring or conveyed to subsequent working procedures for operation through the liquid outlet pipe.
One of the casting methods is low-pressure antigravity casting, and other casting methods can be adopted, including but not limited to gravity casting, vacuum suction casting, counter-pressure casting and the like.
The magnesium or magnesium alloy melt is conveyed from the melting furnace to the purifying furnace, and the melting crucible can be lifted out and fall into the tilting device to tilt the crucible containing the magnesium or magnesium alloy melt so as to inject the melt into the down spout of the purifying crucible.
Compared with the prior art, the utility model has the advantages of it is following and beneficial effect:
1. compared with the conventional purification process of magnesium or magnesium alloy, the vacuum argon stirring-purification smelting process is adopted, and the inclusions of the prepared casting are reduced.
2. The vacuum argon stirring-purifying mode and the mechanical stirring mode are adopted, so that the melt can be more effectively homogenized, the melt quality is improved, and the yield of alloy elements and the stability of chemical components are improved.
3. The whole smelting process is carried out under the quasi-sealing condition, no or little solvent is used, less smoke and dust are generated, the pollution is small, and the working environment of workers can be obviously improved.
4. Adopt device and technology carry out magnesium or magnesium alloy and smelt, equipment cost and maintenance cost are low, the sexual valence relative altitude.
5. Adopt device and technology carry out magnesium or magnesium alloy and smelt, degree of mechanization is high, low in labor strength, but continuous production, production efficiency is high, industrial application prospect is bright.
Drawings
Fig. 1 is a schematic structural diagram of the device for preparing the magnesium or magnesium alloy melt with high cleanliness.
Fig. 2 is a metallographic photograph of a high-cleanliness ZG20 magnesium alloy sample obtained by using the device and the process of the utility model.
Fig. 3 is a metallographic photograph of a GK120 magnesium alloy sample with high cleanliness obtained by using the device and the process of the present invention.
Fig. 4 is a metallographic photograph of a magnesium alloy sample with high cleanliness WE43 obtained by using the device and the process of the utility model.
Wherein: 1-a melting furnace; 101-resistance furnace I; 102-melting the crucible; 103-stirring blades; 104-thermocouple I; 105-melting the crucible cover plate; 106-conduit I; 107-conduit II; 108-a motor; 109-a rotating shaft; 2-a melt transfer device; 201-a riser tube; 202-heat preservation pipeline; 203-a movable support; 204-a downcomer; 3-a purification furnace; 301-liquid outlet pipe; 302-purifying the crucible cover plate; 303-thermocouple II; 304-resistance furnace II; 305-purging the crucible; 306-a purification medium layer; 4-a pneumatic pressurization system; 401-protective gas supply means; 402-a pressure control system; 5-a vacuum system; 501-a vacuum pump; 502-vacuum control system; 6-temperature control system.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
The utility model provides a smelting device for preparing high-cleanliness magnesium or magnesium alloy melt, which is shown in figure 1. The smelting device comprises a melting furnace 1, a purification furnace 3, a vacuum system 5, an inflation pressurization system 4, a melt transfer device 2 and a temperature control system 6, wherein:
the melting furnace 1 is used for melting and homogenizing magnesium or magnesium alloy and comprises a melting crucible 102 and a resistance furnace I101 for heating the melting crucible, and the melting furnace is used for melting magnesium or magnesium alloy, homogenizing chemical components and controlling temperature; a melting crucible cover plate 105 is arranged at the top of the melting crucible 102, a high-temperature resistant flexible substance (such as a flexible graphite packing) is paved between the melting crucible 102 and the melting crucible cover plate 105, and a closed inner cavity isolated from the external environment is formed between the melting crucible and the melting crucible cover plate after the melting crucible and the melting crucible cover plate are covered; a temperature measuring device and a stirring device are arranged in the melting crucible, the temperature measuring device is used for monitoring the temperature of the magnesium or magnesium alloy melt in the crucible, the temperature measuring device is a thermocouple I104, the thermocouple I104 is arranged on a cover plate of the melting crucible in a penetrating manner, and the lower end of the thermocouple I104 extends into the magnesium or magnesium alloy melt in the melting crucible; the stirring device comprises a rotating shaft 109, the rotating shaft is arranged on the melting crucible cover plate, the upper end of the rotating shaft is connected with a motor 108 and is driven by the motor to rotate, the lower end of the rotating shaft is provided with stirring blades 103 for stirring magnesium or magnesium alloy melt, and the number of the stirring blades 103 is more than 1.
The purification furnace 3 is used for purifying magnesium or magnesium alloy melt to remove impurities, and comprises a purification crucible 305, a resistance furnace II 304 and a liquid outlet pipe 301, wherein a purification medium layer 306 is arranged in the purification crucible 305; the purification crucible is heated by a resistance furnace II 304, a purification crucible cover plate 302 is arranged at the top of the purification crucible, and a closed inner cavity isolated from the external environment is formed between the purification crucible and the purification crucible cover plate after the purification crucible cover plate is covered; a temperature measuring device thermocouple II 303 is arranged in the purification crucible, and the lower end of the thermocouple II 303 penetrates through the purification crucible cover plate 302 and extends into the magnesium or magnesium alloy melt in the purification crucible; the upper end of the liquid outlet pipe extends out of the purification crucible cover plate, and the lower end opening of the liquid outlet pipe is higher than the purification medium layer.
The temperature control system is used for monitoring and controlling the temperature in the melting process of the melting crucible and the purification crucible; thermocouple I104 and thermocouple II 303 are both connected to temperature control system 6.
The vacuum system 5 is used for obtaining vacuum atmosphere when the melting crucible is melted, and comprises at least one vacuum pump 501 which is communicated with the melting crucible through a conduit II 107. The vacuum atmosphere (degree of vacuum) in the melting crucible is controlled by a vacuum control system 502 provided on the vacuum pump.
The gas charging and pressurizing system 4 is used for conveying magnesium or magnesium alloy between the melting furnace and the purifying furnace to provide pressure and provide protective gas for the inner cavity of the melting crucible; the inflation pressurization system comprises at least one protective gas supply device 401, the protective gas supply device is communicated with the melting crucible through a conduit I106, and the flow of introduced gas is controlled through a pressure control system 402 connected to the gas supply device.
The melt transfer device 2 is used for conveying magnesium or magnesium alloy melt from a melting furnace to a purifying furnace, and the melting furnace and the purifying furnace are communicated through the melt transfer device 2. The melt transfer device comprises a riser pipe 201, a downcomer 204 and a heat preservation pipeline 202, wherein the lower end of the riser pipe penetrates through the cover plate of the melting crucible and extends into the melting crucible, the downcomer penetrates through the cover plate of the purifying crucible, and the opening at the lower end of the downcomer is immersed in the purifying medium in the purifying crucible; the riser pipe and the downcomer pipe are communicated through a heat preservation pipeline 202, the parts of the riser pipe and the downcomer pipe exposed out of the crucible and the outer surface of the heat preservation pipeline can be heated (such as a tubular resistance furnace) to keep the temperature of the melt, the heat preservation pipeline is supported through a movable support frame 203, and the movable support frame 203 can adjust the height and the direction of the melt transfer device 2. The lower opening of the liquid outlet pipe 301 in the purification crucible is positioned above the lower opening of the downcomer 204 in the purification crucible.
The smelting process for preparing the magnesium or magnesium alloy melt with high cleanliness by using the smelting device comprises the following steps:
(1) adding magnesium ingots or magnesium alloy into a crucible in a melting furnace to prepare raw materials, and controlling the temperature of the melting crucible to be between room temperature and 1000 ℃; opening a vacuum system, and pumping out air in the crucible; introducing protective gas through an inflation pressurization system, starting a stirring device to start stirring and smelting after the magnesium ingot is melted, and obtaining a melt which is melted and uniformly stirred;
(2) controlling the temperature of a purification crucible with a purification medium layer to be between room temperature and 900 ℃;
(3) increasing the air pressure in the purification crucible through an air inflation pressurization system, and conveying the magnesium or magnesium alloy melt in the purification crucible into the purification crucible through the melt transfer device; the melt is fully dispersed and distributed and purified in the process of passing through the purification medium, then under the action of buoyancy, the clean melt is gathered at the upper part of the purification crucible, and can be directly used for pouring or conveyed to subsequent working procedures for operation through the liquid outlet pipe. One of the casting methods is low pressure casting, but other casting methods are also possible, including but not limited to gravity casting, vacuum suction casting, counter-pressure casting, and the like.
Example 1
The magnesium alloy composition of the present example is shown in table 1:
TABLE 1
Utilize the utility model discloses a preparation high cleanliness magnesium or magnesium alloy's novel device and technology of smelting has obtained the embodiment 1 magnesium alloy of high cleanliness, and its production process includes following step:
(1) adding magnesium ingot, zinc ingot, gadolinium block and other raw materials into a crucible in a melting furnace, covering and sealing, controlling the temperature at 750 ℃, opening a vacuum system, and pumping out air in the crucible; and (4) filling protective gas through a gas filling pressurization system, and starting a stirring device to start stirring after the magnesium ingot is melted.
(2) The temperature of the purification crucible with the purification medium layer is controlled to be 780 ℃.
(3) Connecting a melting crucible riser tube and a purification crucible downcomer by a liquid conveying pipeline, and controlling the temperature of the pipeline to be 780 ℃; increasing the gas pressure to transfer the magnesium alloy melt from the melting crucible to the purge crucible; after the melt passes through the purification medium, the melt is converged at the upper part of the purification crucible, and then the follow-up operation is started.
The metallographic image obtained in this example showed no inclusions (FIG. 2), and no inclusions were observed after breaking of the tensile bar sample.
Example 2
The magnesium alloy composition of the present example is shown in table 2:
TABLE 2
Utilize the utility model discloses a preparation high cleanliness magnesium or magnesium alloy's novel device and technology of smelting has obtained the embodiment 2 magnesium alloy of high cleanliness, and its production process includes following step:
(1) adding raw materials such as magnesium ingots, gadolinium blocks, magnesium-zirconium intermediate alloy and the like into a crucible in a melting furnace, covering and sealing, controlling the temperature at 750 ℃, opening a vacuum system, and pumping out air in the crucible; and (4) filling protective gas through a gas filling pressurization system, and starting a stirring device to start stirring after the magnesium ingot is melted.
(2) The temperature of the purification crucible with the purification medium layer is controlled to be 780 ℃.
(3) Connecting a melting crucible riser tube and a purification crucible downcomer by a liquid conveying pipeline, and controlling the temperature of the pipeline to be 780 ℃; increasing the gas pressure to transfer the magnesium alloy melt from the melting crucible to the purge crucible; after the melt passes through the purification medium, the melt is converged at the upper part of the purification crucible, and then the follow-up operation is started.
The metallographic pattern obtained in this example showed no inclusions (FIG. 3), and no inclusions were observed after breaking of the tensile bar sample.
Example 3
The magnesium alloy composition of the present example is shown in table 3:
TABLE 3
Utilize the utility model discloses a preparation high cleanliness magnesium or magnesium alloy's novel device and technology of smelting has obtained the embodiment 3 magnesium alloy of high cleanliness, and its production process includes following step:
(1) adding raw materials such as magnesium ingots, iridium blocks, neodymium blocks, gadolinium blocks, magnesium-zirconium intermediate alloy and the like into a crucible in a melting furnace, cleaning, preheating for half an hour at 300 ℃, scattering a small amount of sulfur powder, covering and sealing, controlling the temperature to be 750 ℃, opening a vacuum system, and pumping out air in the crucible; and (4) filling protective gas through a gas filling pressurization system, and starting a stirring device to start stirring after the magnesium ingot is melted.
(2) The temperature of the purification crucible with the purification medium layer is controlled to be 780 ℃.
(3) Connecting a melting crucible riser tube and a purification crucible downcomer by a liquid conveying pipeline, and controlling the temperature of the pipeline to be 780 ℃; increasing the gas pressure to transfer the magnesium alloy melt from the melting crucible to the purge crucible; after the melt passes through the purification medium, the melt is converged at the upper part of the purification crucible, and then the follow-up operation is started.
The metallographic images obtained in this example showed no inclusions (FIG. 4), and no inclusions were observed after breaking in the standard tensile bar samples. The mechanical property deviation of the parallel sample is small, and the stability is good. The tensile strength of T6-state samples is more than 250MPa, the yield strength is more than 170MPa, the elongation is more than 7%, particularly the elongation is greatly improved compared with the ASTM standard (elongation is 2%), and the elongation of T6-state samples of the same alloy in other casting processes is less than 4%, so that the process has great advantages and application value.
The above examples are specific to the present invention and are intended to be illustrative of the invention and are not intended to limit the invention to these specific embodiments. For those skilled in the art, other various changes may be made based on the above technical solutions and concepts within the scope of the present invention.
Claims (8)
1. A smelting device for preparing magnesium or magnesium alloy melt with high cleanliness is characterized in that: the device comprises a melting furnace, a purification furnace, a vacuum system, an inflation pressurization system and a melt transfer device, wherein:
melting furnace: the melting furnace is used for melting magnesium or magnesium alloy, homogenizing chemical components and controlling temperature;
a purification furnace: the device comprises a purification crucible, a resistance furnace and a liquid outlet pipe, wherein a purification medium layer is arranged in the purification crucible; the purifying furnace is used for purifying the magnesium or magnesium alloy melt to remove impurities;
a temperature control system: the device is used for monitoring and controlling the temperature in the melting process of the melting crucible and the purification crucible;
a vacuum system: the method is used for obtaining the vacuum atmosphere when the melting crucible is melted;
an inflation pressurization system: the magnesium or magnesium alloy conveying device is used for providing pressure for conveying magnesium or magnesium alloy between the melting furnace and the purifying furnace and providing protective gas for the inner cavity of the melting crucible;
a melt transfer device: the melting furnace and the purifying furnace are communicated through a melt transfer device and used for conveying magnesium or magnesium alloy melt from the melting furnace to the purifying furnace.
2. The melting apparatus for producing a high-cleanliness magnesium or magnesium alloy melt according to claim 1, wherein: a melting crucible cover plate is arranged at the top of the melting crucible, and a closed inner cavity isolated from the external environment is formed between the melting crucible and the melting crucible cover plate after the melting crucible cover plate is covered; a temperature measuring device and a stirring device are arranged in the melting crucible, the temperature measuring device is a thermocouple, and the thermocouple is connected with a temperature control system; the lower end of the thermocouple penetrates through the melting crucible cover plate and extends into the magnesium or magnesium alloy melt in the melting crucible; the stirring device comprises a rotating shaft, the rotating shaft is arranged on the melting crucible cover plate, the upper end of the rotating shaft is connected with a motor and is driven by the motor to rotate, the lower end of the rotating shaft is provided with stirring blades for stirring magnesium or magnesium alloy melt, and the number of the stirring blades is greater than 1.
3. The melting apparatus for producing a high-cleanliness magnesium or magnesium alloy melt according to claim 1, wherein: a purification crucible cover plate is arranged at the top of the purification crucible, and a closed inner cavity isolated from the external environment is formed between the purification crucible and the purification crucible cover plate after the purification crucible cover plate is covered; a temperature measuring device is arranged in the purification crucible, the temperature measuring device is a thermocouple, and the thermocouple is connected with a temperature control system; the lower end of the thermocouple penetrates through the cover plate of the purification crucible and extends into the magnesium or magnesium alloy melt in the purification crucible; the upper end of the liquid outlet pipe extends out of the purification crucible cover plate, and the lower end opening of the liquid outlet pipe is higher than the purification medium layer.
4. The melting apparatus for producing a high-cleanliness magnesium or magnesium alloy melt according to claim 1, wherein: the vacuum system comprises at least one vacuum pump, and the vacuum pump is communicated with the melting crucible through a conduit II.
5. The melting apparatus for producing a high-cleanliness magnesium or magnesium alloy melt according to claim 1, wherein: the inflation pressurization system comprises at least one protective gas supply device, and the protective gas supply device is communicated with the melting crucible through a conduit I.
6. The melting apparatus for producing a high-cleanliness magnesium or magnesium alloy melt according to claim 1, wherein: the melt transfer device comprises a liquid lifting pipe, a liquid down-flow pipe and a heat preservation pipeline, wherein the lower end of the liquid lifting pipe penetrates through the melting crucible cover plate and extends into the melting crucible, and the lower end of the liquid down-flow pipe penetrates through the purifying crucible cover plate and extends into a purifying medium in the purifying crucible.
7. The melting apparatus for producing a high-cleanliness magnesium or magnesium alloy melt according to claim 6, wherein: the liquid lifting pipe and the liquid dropping pipe are communicated through a heat preservation pipeline.
8. The melting apparatus for producing a high-cleanliness magnesium or magnesium alloy melt according to claim 6, wherein: the lower opening of the liquid outlet pipe in the purification crucible is positioned above the lower port of the downcomer in the purification crucible.
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