Melting and ingot-making device for magnetic metal or alloy thereof

Abstract

The utility model relates to a magnetic metal or alloy melting ingot making device, which is characterized in that irregular or non-uniform-content magnetic metal or alloy fragments of the magnetic metal are melted into regular sample ingots capable of being sampled, analyzed and detected by an electromagnetic induction heating system. The ratio of the internal diameter to the internal height of the matched crucible is changed from 1: 2 to 2.2-2.5: 1, so that a cake-shaped magnetic metal or alloy sample ingot thereof with more uniform texture can be obtained, and the conventional mode of drilling and sampling from the side surface of a stick-shaped sample ingot can be changed into a mode of drilling from the top surface of the cake-shaped sample ingot to obtain a sample; the non-uniformity of the sample ingot is further eliminated, the analysis and detection precision of the sample ingot is guaranteed, and meanwhile sampling is safer, more convenient and faster. According to the utility model, the defects in the prior art are overcome, the homogeneity of a sample can be improved on the basis of rapidly, safely and energy-saving obtaining of the molten sample ingot of the magnetic metal or the alloy thereof, and the sampling can be completed more rapidly, conveniently and safely.

Description

Technical Field

[0001] The utility model relates to a melting and ingot-making device, in particular to a melting and ingot-making device for ferromagnetic metals or their alloys, belonging to the technical field of production and manufacturing of experimental devices. Background Art

[0002] When analyzing and detecting the composition and content of metal or alloy samples, the sampling rule requires that samples must be taken from representative parts of the metal or alloy materials. The specimens should be uniform, fully representative of each melt or batch, and have sufficient quantity to meet the analysis requirements of each item.

[0003] When encountering metal or alloy samples with irregular shapes or uneven contents, it is usually necessary to first melt the metal or alloy sample fragments into cylindrical metal or alloy ingots, and then obtain specimens for testing by multi-point drilling on the ingots. The diameter of the obtained specimens is generally about 10 mm.

[0004] In the prior art, for the crucible that melts metal or alloy fragments into cylindrical metal or alloy ingots, the ratio of its diameter to its height is usually 1:2, that is, the obtained metal or alloy ingot is a rod-shaped cylinder. Usually, its circular surface diameter is 30 mm, and the height is about 60 mm. Since the diameter of the ingot is small, therefore, only as Figure 1 As shown in the schematic diagram of the metal or alloy ingot and its sampling method in the prior art, usually, only the side of the rod-shaped cylindrical ingot 100 can be drilled to obtain the metal or alloy specimen 101. Obviously, drilling and sampling on the side of the rod-shaped cylindrical metal or alloy ingot is neither convenient nor safe.

[0005] In addition, since the height or length of the ingot is much larger than its diameter, during its melting process, different elements in the metal or alloy fragments will have non-uniform distribution due to their different specific gravities or binding forces with other elements. Thus, the specimens obtained by drilling at different parts on the side of the rod-shaped cylindrical ingot are actually not uniform. Obviously, this will affect the accuracy of analysis and detection.

[0006] There are various heating and melting methods for melting metal or alloy fragments into cylindrical ingots. Among them, ferromagnetic metals or their alloys, such as nickel alloys, etc., can be melted by electromagnetic induction heating.

[0007] The principle of electromagnetic induction heating is that the alternating current generated by the induction heating power supply passes through the inductor, that is, the coil, to generate an alternating magnetic field. The ferromagnetic object is placed in the inductor to cut the alternating magnetic force lines, thereby generating an alternating current, that is, eddy current, inside the ferromagnetic object. The eddy current causes the atoms inside the ferromagnetic object to collide and rub at high speed and randomly, thereby generating heat energy, achieving the effect of heating the object. Simply put, it is a heating method that converts electrical energy into magnetic energy and makes the ferromagnetic substance sense the magnetic energy and heat up.

[0008] Electromagnetic induction heating features high efficiency in energy conservation, rapid heating and internal heating. Its average heating time is shortened by 2 / 3 compared with the resistance coil heating method. Meanwhile, its thermal efficiency is as high as over 95%, and the power saving effect can reach 30 - 70%. Thus, it can reduce the operation cost, improve the operation efficiency, and has reliable and controllable operation, which can improve the working environment and increase the safety factor.

[0009] An electromagnetic induction heating system generally includes a regulated power supply, a water chiller, a high-frequency current generator, and an induction heater, etc. Among them, the regulated power supply is electrically connected to the water chiller and the high-frequency current generator respectively, providing a stable working power supply for the water chiller and the high-frequency current generator. And the water chiller provides circulating cooling water for the high-frequency current generator and the induction heater to ensure the normal operation of the high-frequency current generator and the induction heater, and prevent them from being affected by overheating in terms of working efficiency or even burned out.

[0010] However, for the rod-shaped cylindrical ingots of ferromagnetic metals or their alloys obtained by simply applying the electromagnetic induction heating system in the prior art and using a rod-shaped cylindrical crucible to heat and melt ferromagnetic metals or their alloys, they have the same deficiencies as the rod-shaped cylindrical metal or alloy ingots in the prior art, such as inconvenient, unsafe drilling and sampling, and the obtained samples are non-uniform and cannot guarantee the accuracy of analysis and detection, etc. Summary of the Invention

[0011] To overcome the deficiencies of the prior art, the present invention particularly provides a device for melting and ingot-making of ferromagnetic metals or their alloys. On the basis of being able to quickly, energy-savingly and safely obtain the molten ingots of ferromagnetic metals or their alloys, it improves the uniformity of the ingots, providing a basis for improving the accuracy of their analysis and detection; meanwhile, it improves the sampling conditions, enabling the sampling personnel to complete sampling quickly, conveniently and safely.

[0012] To achieve the above object, the present invention particularly provides the following technical solutions:

[0013] A device for melting and ingot-making of ferromagnetic metals or their alloys heats and melts ferromagnetic metals or their alloys into ingots that can be analyzed and detected for their components and contents through an electromagnetic induction heating system. The electromagnetic induction heating system includes a regulated power supply, a water chiller and a high-frequency current generator. Among them, the regulated power supply is electrically connected to the water chiller and the high-frequency current generator respectively, and the water chiller provides circulating cooling water for the high-frequency current generator. In addition:

[0014] It further includes an induction heater and a crucible;

[0015] The induction heater is a spiral tube structural member formed by winding a copper tube for multiple turns. The induction heater is connected to the high-frequency current generator, and the copper tube forming the induction heater is also connected to the water chiller through the high-frequency current generator to introduce the circulating cooling water.

[0016] The crucible is made of a non-magnetic and high-temperature resistant material and can be completely placed in the spiral tube of the induction heater. The ratio of the inner diameter to the inner height of the crucible is 2.2 - 2.5:1. The crucible is used to hold irregular or unevenly distributed magnetic metals or their alloy fragments that need to be melted into regular ingots for composition and content analysis and detection.

[0017] Optionally, the inner diameter of the crucible is 50 mm, and the inner height of the crucible is 20 mm.

[0018] Optionally, the crucible is made of corundum.

[0019] Furthermore, the magnetic metal or its alloy melting and ingot-making device further includes a spacer block made of a non-magnetic and high-temperature resistant material. The spacer block is used to pad the bottom of the crucible so that the body of the crucible is located in the spiral structure of the induction heater.

[0020] Furthermore, the magnetic metal or its alloy melting and ingot-making device further includes a protective cover, and the induction heater can be sleeved outside the protective cover;

[0021] The crucible is located inside the protective cover and in the spiral structure of the induction heater. An air inlet pipe and an air outlet pipe are further provided on the upper end cap of the protective cover. The air inlet pipe is used to introduce nitrogen, and the nitrogen is used to cover the crucible to prevent oxidation of the magnetic metal or its alloy in the crucible during the melting process.

[0022] Optionally, the protective cover is made of quartz material.

[0023] Furthermore:

[0024] The working current of the high-frequency current generator is 34 A; its working voltage is three-phase 380 V, 50 - 60 Hz; its output oscillation frequency is 30 - 100 KHz; its heating oscillation current is 300 - 1800 A.

[0025] Furthermore, the copper tube used to make the induction heater has a diameter of 6 - 8 mm, a wall thickness > 1 mm, and a total length of 500 - 1500 mm.

[0026] Furthermore:

[0027] The circulating cooling water has a flow rate of ≥6 L / min, a minimum water pressure of 0.12 MPa, a maximum inlet temperature of <40 °C, a pH value of 7.0 - 9.0, where the chloride content is <20 ppm, the nitrate content is <10 ppm, the calcium carbonate content is <250 ppm, the resistivity at 25 °C is >2500 Ω·cm, the total dissolved solid impurity content is <250 ppm, and the temperature without solid impurity precipitation is T < 57 °C.

[0028] Furthermore, a demagnetizing agent, a preservative, and a maximum of 0.4% of the anti - coagulant diethanol are added to the circulating cooling water.

[0029] Compared with the prior art, the beneficial effects and progress of the present utility model are as follows:

[0030] The device for melting and ingoting ferromagnetic metal or its alloy provided by the present utility model also performs high - frequency electromagnetic induction heating on ferromagnetic metal or its alloy through an electromagnetic induction heating system, melting irregular or uneven - content ferromagnetic metal or its alloy fragments into regular ingots that can be analyzed for composition and content. The difference from the prior art is that the ratio of the inner diameter to the inner height of the crucible used is changed from the usual 1:2 to 2.2 - 2.5:1. That is, the obtained ferromagnetic metal or its alloy ingot is a cake - shaped ingot instead of the rod - shaped ingot seen in the prior art. Thus, the drilling sampling method can be completely changed, that is, from the current drilling sampling method on the side of the rod - shaped ingot to drilling sampling from the top surface of the cake - shaped ingot. Obviously, such a sampling method is safer and more convenient;

[0031] A more significant progress is that due to the change in the ratio of the inner diameter to the inner height of the crucible, its surface area is greatly expanded, while its depth is much smaller, so that the various constituent elements in the molten ferromagnetic metal or its alloy will not be uneven due to the gravity difference; and the sampling method is changed from obtaining samples by drilling on the side of the rod - shaped ingot to obtaining samples from the top surface of the cake - shaped ingot from top to bottom, which can further eliminate the non - uniformity of the ingot itself, thus providing a prerequisite and basis for ensuring the accuracy of its analysis and detection;

[0032] It can be seen from this that the present utility model overcomes the deficiencies of the prior art, can improve the uniformity of the ingot on the basis of quickly, energy - savingly, and safely obtaining the melted ingot of ferromagnetic metal or its alloy, providing a prerequisite for improving the accuracy of its analysis and detection; at the same time, it improves the sampling conditions and methods, enabling the sampling personnel to complete sampling quickly, conveniently, and safely. Compared with the prior art, it has substantial features and progress, and therefore has great value for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] To more clearly illustrate the technical solution of the present utility model, the following will briefly introduce the drawings required for the embodiments of the present utility model.

[0034] Obviously, the drawings in the following description are only the drawings of some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, but these other drawings also belong to the scope of the drawings required for the embodiments of the present utility model.

[0035] Figure 1 Schematic diagram of a metal or alloy sample ingot and its sampling method in the prior art;

[0036] Figure 2 Schematic diagram of the structure of a magnetic conductive metal or its alloy melting and ingot making device provided by an embodiment of the present utility model;

[0037] Figure 3 Schematic cross-sectional view of a crucible supporting a magnetic conductive metal or its alloy melting and ingot making device provided by an embodiment of the present utility model;

[0038] Figure 4 Schematic diagram of a magnetic conductive metal or its alloy sample ingot and its sampling method provided by an embodiment of the present utility model;

[0039] Figure 5 Schematic diagram of the structure of a magnetic conductive metal or its alloy melting and ingot making device with a nitrogen protection mechanism provided by an embodiment of the present utility model.

[0040] In the figure:

[0041] 100 - rod-shaped cylindrical sample ingot, 101 - metal or alloy sample, 200 - disc-shaped magnetic conductive metal or its alloy sample ingot, 201 - magnetic conductive metal or its alloy sample;

[0042] 10 - regulated power supply, 20 - water chiller, 21 - water pipe, 30 - high-frequency current generator, 40 - induction heater, 50 - crucible, 60 - spacer, 70 - protective cover, 71 - intake pipe, 72 - exhaust pipe;

[0043] d - inner diameter of the crucible, h - inner height of the crucible. Detailed implementation manners

[0044] To make the objectives, technical solutions, beneficial effects and remarkable progress of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings provided for the embodiments of the present utility model. Obviously, all the described embodiments are only partial embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0045] It should be noted that the terms "including" and any variations thereof in the description and claims of the present utility model are intended to cover non-exclusive inclusion. For example, it includes not only a series of listed technical features and structural components, but also optionally includes technical features and structural components not listed, or optionally further includes the connection relationships between these technical features and structural components.

[0046] It needs to be understood that:

[0047] In the description of the embodiments of the present utility model, the directional or positional terms such as "upper", "lower", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the accompanying drawings of the embodiments of the present utility model. It is for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element must have a specific orientation, specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present utility model.

[0048] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or a movable connection, or a connection relationship that becomes an integral body. It can be a direct connection or an indirect connection through an intermediate medium. It can be the communication inside two structural elements or the interaction relationship between two elements. Unless otherwise clearly defined, 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 circumstances.

[0049] It also needs to be noted that:

[0050] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0051] Below, the technical solutions of the present utility model will be described in detail with specific embodiments.

[0052] Embodiment

[0053] This embodiment provides a device for heating and melting fragments of ferromagnetic metal or its alloy to make sample ingots.

[0054] As shown in Figure 2 FIG. 1, which is a schematic structural diagram of a device for melting and ingot-making of a magnetic conductive metal or its alloy provided by an embodiment of the present invention, Figure 3 and FIG. 2, which is a schematic cross-sectional structural diagram of a crucible supporting the device for melting and ingot-making of a magnetic conductive metal or its alloy provided by an embodiment of the present invention, show that:

[0055] A device for melting and ingot-making of a magnetic conductive metal or its alloy melts the magnetic conductive metal or its alloy into a sample ingot that can be analyzed and detected for its composition and content through a high-frequency electromagnetic induction heating system. The electromagnetic induction heating system includes a regulated power supply 10, a water chiller 20, and a high-frequency current generator 30. Among them, the regulated power supply 10 is electrically connected to the water chiller 20 and the high-frequency current generator 30 respectively. The water chiller 20 provides circulating cooling water for the high-frequency current generator 30 through a water pipe 21. In addition:

[0056] It further includes an induction heater 40 and a crucible 50;

[0057] The induction heater 40 is a spiral tube structural member formed by winding a copper pipe for multiple turns. The induction heater 40 is connected to the high-frequency current generator 30, and the copper pipe forming the induction heater 40 is also connected to the water chiller 20 through the high-frequency current generator 30 to introduce circulating cooling water;

[0058] The crucible 50 is made of a non-magnetic high-temperature resistant material and can be completely placed in the spiral tube of the induction heater 40. The ratio of the inner diameter d to the inner height h of the crucible 50 is: d:h = 2.2 - 2.5:1. The crucible 5 is used to hold irregular or uneven-content magnetic conductive metal or alloy fragments that need to be melted into regular sample ingots for analysis and detection of their composition and content.

[0059] Optionally, the inner diameter of the crucible 50 is 50 mm, and the inner height of the crucible 50 is 20 mm.

[0060] Optionally, the crucible 50 is made of corundum.

[0061] From the above description, it can be seen that:

[0062] The device for melting and ingot-making of a magnetic conductive metal or its alloy provided by this embodiment melts irregular or uneven-content magnetic conductive metal or alloy fragments into regular sample ingots that can be analyzed and detected for their composition and content through a high-frequency electromagnetic induction heating system. Different from the prior art, the ratio of the inner diameter to the inner height of the crucible supporting the device has been changed from the usual 1:2 to 2.2 - 2.5:1, and it can obtain as Figure 4The ingot of magnetic conductive metal or its alloy provided by the embodiment of the present utility model is the disc-shaped ingot 200 of magnetic conductive metal or its alloy shown in the schematic diagram of the sampling method, rather than the rod-shaped cylindrical ingot 100 seen in the prior art. In this way, the drilling sampling method can be completely changed, that is, the drilling sampling method on the side of the rod-shaped ingot is changed to drilling sampling from the top surface of the disc-shaped ingot to obtain the sample 201 of magnetic conductive metal or its alloy. Obviously, such a sampling method is safer and more convenient.

[0063] Although it cannot be directly seen from the above drawings, through analysis, it can be known that the more significant progress of the melting and ingot-making device of magnetic conductive metal or its alloy provided by this embodiment compared with the prior art lies in:

[0064] Since the ratio of the inner diameter to the inner height of the supporting crucible is changed from the usual 1:2 to 2.2 - 2.5:1, the surface area is greatly expanded, and its depth is much smaller, so that the various constituent elements in the molten magnetic conductive metal or its alloy will not be uneven due to the gravity difference. And the sampling method is changed from drilling on the side of the rod-shaped ingot to drilling from the top surface of the disc-shaped ingot from top to bottom, which can better eliminate the non-uniformity of the ingot itself, thus providing a prerequisite and basis for ensuring the accuracy of its analysis and detection.

[0065] Furthermore, the melting and ingot-making device of magnetic conductive metal or its alloy provided by this embodiment further includes a cushion block 60. The cushion block 60 is made of non-magnetic and high-temperature-resistant material. The cushion block 60 is used to pad at the bottom of the crucible 50 so that the body of the crucible 50 is located in the spiral structure of the induction heater 40, so that the magnetic conductive metal or its alloy in the crucible 50 can better obtain the energy provided by the induction heater 40.

[0066] Furthermore, as Figure 5 shown in the structural schematic diagram of the melting and ingot-making device of magnetic conductive metal or its alloy with a nitrogen protection mechanism provided by the embodiment of the present utility model, the melting and ingot-making device of magnetic conductive metal or its alloy provided by this embodiment further includes a protective cover 70, and the induction heater 40 can be sleeved outside the protective cover 70;

[0067] The crucible 50 is located inside the protective cover 70 and in the spiral structure of the induction heater 40. An air inlet pipe 71 and an air outlet pipe 72 are further provided on the upper end cover of the protective cover 70. The air inlet pipe 71 is used to introduce nitrogen, and the nitrogen is used to cover the crucible 5 to prevent the magnetic conductive metal or its alloy in the crucible 5 from being oxidized during the melting process.

[0068] Optionally, the protective cover 70 is made of quartz material.

[0069] Furthermore, in the melting and ingot-making device of magnetic conductive metal or its alloy provided by this embodiment:

[0070] The high-frequency current generator 30 has an operating current of 34 A, an operating voltage of three-phase 380 V, 50 - 60 Hz, an output oscillation frequency of 30 - 00 KHz, and a heating oscillation current of 300 - 800 A.

[0071] The copper pipe for making the induction heater 40 has a diameter of 6 - 8 mm, a wall thickness > mm, and a total length of 500 - 500 mm.

[0072] The circulating cooling water has a flow rate of ≥6 L / min, a minimum water pressure of 0.2 MPa, a maximum inlet temperature < 40 °C, a pH value of 7.0 - 9.0, where the chloride content < 20 ppm, the nitrate content < 0 ppm, the calcium carbonate content < 250 ppm, the resistivity at 25 °C > 2500 Ω·cm, the total dissolved solid impurity content < 250 ppm, and the temperature at which no solid impurities precipitate is T < 57 °C.

[0073] The circulating cooling water also contains a demagnetizing agent, a preservative, and a coagulation inhibitor diethanol not exceeding four per thousand.

[0074] It can be seen that:

[0075] The electromagnetic induction heating system configured in this embodiment can meet the general needs of the laboratory, that is, to perform high-frequency electromagnetic induction heating on ferromagnetic metals or their alloys to melt and obtain ingots for analyzing their composition and content.

[0076] In summary, it can be seen that:

[0077] The device for melting and ingot-making of ferromagnetic metals or their alloys provided by the present utility model can obtain ingots of ferromagnetic metals or their alloys in the shape of cakes by configuring a crucible capable of obtaining cakes of ferromagnetic metals or their alloys and an induction heater matching the crucible, thereby changing the way of drilling and sampling, making the sampling process safer and more convenient, and thus obtaining more uniform ingots and more homogeneous specimens, so as to ensure the accuracy of its analysis and detection.

[0078] In addition, in a further improved embodiment, nitrogen can be used to protect the ferromagnetic metal or its alloy during the melting process to prevent oxidation, thereby further ensuring the accuracy of its analysis and detection.

[0079] In summary, the device for melting and ingoting magnetic metal or its alloy provided by the present utility model overcomes the deficiencies of the prior art. On the basis of quickly, energy-savingly and safely obtaining the molten sample ingots of magnetic metal or its alloy, it can improve the uniformity of the sample ingots, providing a prerequisite for improving the accuracy of its analysis and detection. At the same time, it improves the sampling conditions and methods, enabling the sampling personnel to complete sampling quickly, conveniently and safely. Compared with the prior art, it has substantial features and progress. Therefore, it has great value for popularization and application.

[0080] During the description process of the above specification, the descriptions of terms such as "this embodiment", "embodiment of the present utility model", "as shown in...", "further", etc. mean that the specific features, structures, materials or characteristics described in the embodiment are included in at least one embodiment of the present utility model. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment, and moreover, the specific features, structures, materials or characteristics, etc. described can be combined or combined in a suitable manner in any one or more embodiments; in addition, on the premise of not generating contradictions, those of ordinary skill in the art can combine or combine the different embodiments and the features of different embodiments described in this specification.

[0081] Finally, it should be noted that:

[0082] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent substitution on some or all of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions described in the embodiments of the present utility model. The non-essential improvements, adjustments or substitutions made by those skilled in the art according to the content recorded in this specification all fall within the scope of protection required by the present utility model.

Claims

1. A device for melting and making ingots of magnetic conductive metal or its alloy, which uses an electromagnetic induction heating system to perform high-frequency electromagnetic induction heating on the magnetic conductive metal or its alloy to melt into a sample ingot capable of analyzing and detecting its composition and content, wherein the electromagnetic induction heating system comprises a voltage-stabilized power supply, a water cooler and a high-frequency current generator, wherein: The voltage-stabilized power supply is electrically connected to the water cooler and the high-frequency current generator respectively, and the water cooler provides circulating cooling water for the high-frequency current generator, characterized in that: Also included are induction heaters and crucibles; The induction heater is a spiral tube structure formed by winding a copper tube for multiple turns. The induction heater is connected to the high-frequency current generator, and the copper tube constituting the induction heater is also connected to the water chiller through the high-frequency current generator to introduce the circulating cooling water; The crucible is made of non-magnetic high-temperature resistant material and can be completely placed in the spiral tube of the induction heater, and the ratio of the inner diameter of the crucible to its inner height is 2.2-2.5:

1. The crucible is used to hold irregular or unevenly contained magnetic metal or alloy fragments that need to be melted into regular sample ingots for composition and content analysis.

2. The device for making a magnetic ingot by melting a magnetic conductive metal or its alloy as claimed in claim 1, characterized in that: The inner diameter of the crucible is 50 mm, and the inner height of the crucible is 20 mm.

3. The device for making a magnetic ingot by melting a magnetic conductive metal or its alloy as claimed in claim 1, characterized in that: The crucible is made of corundum.

4. The device for making a magnetic ingot by melting a magnetic conductive metal or its alloy according to claim 1, characterized in that: It also includes a pad, which is made of a non-magnetic high-temperature resistant material and is used to pave the bottom of the crucible so that the body of the crucible is located in the spiral structure of the induction heater.

5. The device for making a magnetic ingot by melting a magnetic conductive metal or its alloy according to claim 1, characterized in that: It also includes a protective cover, and the induction heater can be sleeved outside the protective cover; The crucible is located inside the protective cover and in the spiral structure of the induction heater, and the upper cover of the protective cover is also provided with an air inlet pipe and an air outlet pipe, the air inlet pipe is used to introduce nitrogen, and the nitrogen is used to cover the crucible to prevent the magnetic metal or its alloy in the crucible from being oxidized during the melting process.

6. The device for making a magnetic ingot by melting a conductive metal or its alloy as claimed in claim 5, characterized in that: The protective cover is made of quartz material.

7. The device for making a magnetic ingot by melting a magnetic conductive metal or its alloy as claimed in claim 1, characterized in that: The high-frequency current generator has an operating current of 34A, an operating voltage of three-phase 380V, 50-60Hz, an output oscillation frequency of 30-100KHz, and a heating oscillation current of 300-1800A.

8. The device for making a magnetic ingot by melting a conductive metal or its alloy as claimed in claim 7, characterized in that: The copper tube used to make the induction heater has a diameter of 6-8 mm, a wall thickness of more than 1 mm, and a total length of 500-1500 mm.

9. The device for making a magnetic ingot by melting a magnetic conductive metal or its alloy according to claim 7, characterized in that: The circulating cooling water has a flow rate of ≥6L / min, a minimum water pressure of 0.12MPa, a maximum water inlet temperature of <40°C, a pH value of 7.0-9.0, wherein the chloride content is <20ppm, the nitrate content is <10ppm, the calcium carbonate content is <250ppm, the resistivity at 25°C is >2500Ω·cm, the total dissolved solid impurity content is <250ppm, and the temperature at which no solid impurities precipitate is T <57°C.

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