CN217018606U - Magnetic rotating arc plasma spheroidizing device - Google Patents
Magnetic rotating arc plasma spheroidizing device Download PDFInfo
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- CN217018606U CN217018606U CN202123017699.7U CN202123017699U CN217018606U CN 217018606 U CN217018606 U CN 217018606U CN 202123017699 U CN202123017699 U CN 202123017699U CN 217018606 U CN217018606 U CN 217018606U
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Abstract
The utility model discloses a magnetic rotating arc plasma spheroidizing device which comprises a cathode section, an insulation section, a feeding section, an anode section and a spheroidizing chamber which are sequentially arranged from top to bottom; the feeding section and the anode section are grounded; the cathode section comprises a rod-shaped cathode which penetrates through the insulating section and extends into the anode section; the outer side of the anode section is provided with an excitation coil; the top of the spheroidizing chamber is provided with a plurality of circumferentially arranged air curtain nozzles, and the side surface is close to the lower end and is circumferentially provided with a plurality of quenching nozzles. According to the utility model, the feeding section is arranged below the insulating section, is grounded, and has a potential of 0, so that the problem of breakdown is avoided, and the requirement on the insulating property of the material of the feeding section can be reduced. The magnetic rotating arc plasma spheroidizing device can enable powder materials to pass through an electric arc rotating at a high speed, so that the materials can be fully heated, the spheroidizing quality and the spheroidizing rate are improved, the energy consumption is reduced, and the device is suitable for large-scale industrial production of spherical powder.
Description
Technical Field
The utility model relates to the technical field of plasma spheroidization, in particular to a magnetic rotating arc plasma spheroidizing device.
Background
In the plasma spheroidization technology, the sphericity and compactness of powder have extremely important influence on the quality of powder metallurgy and additive manufacturing, and the powder after spheroidization has the advantages of good fluidity, high stacking density, low porosity and the like, and the density and mechanical property of a powder metallurgy product can be effectively improved. However, in the existing plasma spheroidizing device, the spheroidizing of the powder is unstable due to the uneven temperature distribution and poor stability of the plasma torch.
The specification of patent with publication number CN1194807C discloses an apparatus and method for preparing spherical micro-and nano-powder by direct current arc plasma. The device has the characteristics of long service life (the service life of the cathode can reach 50-100 hours, the service life of the anode can reach 50-200 hours), small electrode loss, high heat efficiency, continuous operation, controllable granularity and hundred tons of annual output of a single device, realizes industrial large-scale production of micron-grade and nanometer-grade powder, and can produce spherical micron-grade and nanometer-grade materials (including spherical micron-grade and nanometer-grade SiO)2，U3Si2，Sb2O3And various powder materials).
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the field, the utility model provides a magnetic rotating arc plasma spheroidizing device, which solves the problems of poor plasma spheroidizing effect, difficulty in amplification and the like in the prior art. The spheroidizing method can effectively strengthen the spheroidizing effect of the powder and realize large-scale industrial production.
The specific technical scheme is as follows:
a magnetic rotating arc plasma spheroidizing device comprises a cathode section, an insulation section, a feeding section, an anode section and a spheroidizing chamber which are sequentially arranged from top to bottom;
the feeding section and the anode section are grounded;
the cathode section comprises a rod-shaped cathode which penetrates through the insulating section and extends into the anode section;
the outer side of the anode section is provided with an excitation coil;
the top of the spheroidizing chamber is provided with a plurality of circumferentially arranged air curtain nozzles, and the side surface is close to the lower end and is circumferentially provided with a plurality of quenching nozzles.
When the magnetic rotating arc plasma spheroidizing device is used, raw materials are fed from the feeding section, the raw materials are melted under the high-temperature action of the magnetic rotating arc plasma torch to form liquid drops, the liquid drops enter the spheroidizing chamber, the quenching nozzle can spray quenching gas for cooling, and the quenching gas is rapidly cooled and solidified in the spheroidizing chamber to form spherical powder.
The cathode bar can be made of one of materials such as cerium tungsten, red copper, silver, graphite carbon materials and the like, the excitation coil is arranged at the outer side of the anode section, and after the excitation coil is electrified, a magnetic field is generated to rotate an electric arc, so that the temperature distribution of the torch is improved, and the generated magnetic rotation plasma torch is a coaxial plasma torch; the insulating segment can adopt polymer, metal oxide, metal nitride and other insulating materials.
According to the utility model, the feeding section is arranged below the insulating section, is grounded, and has a potential of 0, so that the problem of breakdown is avoided, and the requirement on the insulating property of the material of the feeding section can be reduced.
In a preferred embodiment, the material feeding section of the magnetic rotating arc plasma spheroidizing device comprises a plurality of material nozzles which are uniformly distributed along the circumference and form an angle of 0-90 degrees with the tangential direction of the circumference.
In a preferred embodiment, in the magnetic rotating arc plasma spheroidizing device, the number of the material nozzles is 3-12.
In a preferred embodiment, the anode section of the magnetic rotating arc plasma spheroidizing device is provided with a water-cooling jacket.
In a preferred embodiment, the diameter of the spheroidizing chamber of the magnetic rotating arc plasma spheroidizing device is 2-10 times that of the anode section.
In a preferred embodiment, in the magnetic rotating arc plasma spheroidizing device, the connecting section of the anode section and the spheroidizing chamber gradually expands in diameter from top to bottom.
In a preferred embodiment, the gas curtain nozzle of the magnetic rotating arc plasma spheroidizing device is arranged downwards.
The diameter of the lower end of the anode section is expanded and is combined with the gas film nozzle to spray downwards to form a gas curtain, so that wall-sticking scars in the device are reduced.
In a preferred embodiment, the number of the air curtain nozzles of the magnetic rotating arc plasma spheroidizing device is 24-120, and the air curtain nozzles are uniformly distributed in the circumferential direction.
In a preferred embodiment, the quenching nozzles of the magnetic rotating arc plasma spheroidizing device face the center of the spheroidizing chamber, the number of the quenching nozzles is 24-180, and the quenching nozzles are uniformly distributed in the circumferential direction.
In a preferred embodiment, the magnetic rotating arc plasma spheroidizing device has a necking at the lower end of the spheroidizing chamber, so that the blanking and the collection are convenient.
Compared with the prior art, the utility model has the main advantages that:
1. the magnetic rotating arc plasma spheroidizing device can enable powder materials to pass through an electric arc rotating at a high speed, so that the materials can be fully heated, the spheroidizing quality and the spheroidizing rate are improved, the energy consumption is reduced, and the device is suitable for large-scale industrial production of spherical powder.
2. According to the utility model, the feeding section is arranged below the insulating section, is grounded, and has a potential of 0, so that the problem of breakdown is avoided, and the requirement on the insulating property of the material of the feeding section can be reduced.
Drawings
Fig. 1 is a schematic structural view of a magnetic rotating arc plasma spheroidizing device of the present invention, in which: 1-cathode section, 2-insulation section, 3-feeding section, 4-anode section, 5-magnet exciting coil, 6-spheroidizing chamber, 6-1 air curtain nozzle and 6-2 quenching nozzle;
FIG. 2 is a schematic view of the structural design of three material nozzles of the feeding section;
FIG. 3 is a scanning electron micrograph of the starting material;
FIG. 4 is a scanning electron micrograph of a raw material after spheroidization;
fig. 5 is an optical microscope photograph after spheroidizing the raw material.
Detailed Description
The utility model is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
As shown in figure 1, the magnetic rotating arc plasma spheroidizing device comprises a cathode section 1, an insulating section 2, a feeding section 3, an anode section 4 and a spheroidizing chamber 6 which are sequentially arranged from top to bottom. The cathode section 1 comprises a rod-shaped cathode extending through the insulating section 2 into the anode section 4. The anode section 4 is provided with a water-cooling jacket, and the outer side of the anode section is provided with an excitation coil 5.
The material conveying section is grounded in 3 degrees, the structure of the material conveying section comprises a plurality of material nozzles which are uniformly distributed along the circumference and form an angle of 0-90 degrees with the tangential direction of the circumference, and the number of the material nozzles can be 3-12.
The connecting section of the anode section 4 and the spheroidizing chamber 6 is gradually expanded in diameter from top to bottom.
The top end of the spheroidizing chamber 6 is provided with downward air curtain nozzles 6-1 which are uniformly distributed in the circumferential direction. The number of the air curtain nozzles 6-1 may be 24-120.
A plurality of quenching nozzles 6-2 are circumferentially arranged on the side surface of the spheroidizing chamber 6 close to the lower end, the quenching nozzles 6-2 face to the center of the spheroidizing chamber 6, the number of the quenching nozzles can be 24-180, and the quenching nozzles are circumferentially and uniformly distributed. The lower end of the spheroidizing chamber 6 is reduced.
When the magnetic rotating arc plasma spheroidizing device is used, raw materials are fed from the feeding section 3, the raw materials are melted under the high-temperature action of the magnetic rotating arc plasma torch to form liquid drops, then the liquid drops enter the spheroidizing chamber 6, and the liquid drops are rapidly cooled and solidified in the spheroidizing chamber 6 through quenching air to form spherical powder.
Example 1
The magnetic rotating arc plasma spheroidizing device of the embodiment is shown in fig. 1, a rod-shaped cerium-tungsten cathode is vertically inserted into the device, an insulating section 2 adopts polytetrafluoroethylene to connect the cathode with a feeding section 3, and the feeding section 3 adopts a 6-nozzle opposite-spraying feeding structure as shown in a B structure in fig. 2. The anode section 4 is a jacket water cooling structure, and the inner wall of the anode section is cylindrical. The outside of the anode section 4 is provided with an excitation coil 5 which can generate a magnetic field when being electrified, and the electric arc forms a magnetic rotating arc under the action of the magnetic field to stabilize the electric arc to operate at the section. The anode section 4 is connected with a spheroidizing chamber 6, and the diameter of the spheroidizing chamber 6 is 3 times that of the anode section 4. The top wall surface side of the spheroidizing chamber 6 is provided with 48 downward air curtain nozzles 6-1 which are uniformly distributed in the circumferential direction and are sprayed downward to form an air curtain. The lower end of the spheroidizing chamber is provided with radial quenching nozzles, the number of the nozzles is 72, and quenching gas can be sprayed, so that the molten and spheroidized liquid drops are quickly cooled to form spherical powder.
The scanning electron micrograph of the aluminum oxide powder used as the raw material is shown in fig. 3, the scanning electron micrograph after spheroidization by magnetic rotating arc plasma is shown in fig. 4, and the optical micrograph is shown in fig. 5.
Example 2
The magnetic rotating arc plasma spheroidizing device of the embodiment is shown in fig. 1, a water-cooled red copper cathode is vertically inserted into the device, an insulating section 2 adopts corundum to connect the cathode with a feeding section 3, and the feeding section 3 adopts a structure C in fig. 2 and adopts 8-nozzle tangential feeding. The anode section 4 is a jacket water cooling structure, and the inner wall of the anode section is cylindrical. The outside of the anode section 4 is provided with an excitation coil 5 which can generate a magnetic field when being electrified, and the electric arc forms a magnetic rotating arc under the action of the magnetic field to stabilize the electric arc to run at the section. The anode section 4 is connected with a spheroidizing chamber 6, and the diameter of the spheroidizing chamber 6 is 8 times of that of the anode section 4. The top wall surface side of the spheroidizing chamber 6 is provided with 96 downward air curtain nozzles 6-1, the nozzles are uniformly distributed in the circumferential direction and are sprayed downward to form an air curtain. The lower end of the spheroidizing chamber is provided with radial quenching nozzles, the number of the nozzles is 120, and quenching gas can be sprayed, so that the molten and spheroidized liquid drops are quickly cooled to form spherical powder.
Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the utility model as defined by the appended claims.
Claims (9)
1. A magnetic rotating arc plasma spheroidizing device is characterized by comprising a cathode section (1), an insulation section (2), a feeding section (3), an anode section (4) and a spheroidizing chamber (6) which are sequentially arranged from top to bottom;
the feeding section (3) and the anode section (4) are grounded;
the cathode section (1) comprises a rod-shaped cathode which penetrates through the insulating section (2) and extends into the anode section (4);
the outer side of the anode section (4) is provided with an excitation coil (5);
the top of the spheroidizing chamber (6) is provided with a plurality of circumferentially arranged air curtain nozzles (6-1), and the side surface is circumferentially provided with a plurality of quenching nozzles (6-2) close to the lower end.
2. The magnetic rotating arc plasma spheroidizing device according to claim 1, wherein the structure of the feeding section (3) comprises a plurality of material nozzles uniformly distributed along the circumference and forming an angle of 0-90 degrees with the tangential direction of the circumference.
3. The magnetic rotating arc plasma spheroidizing apparatus according to claim 2, wherein the number of the material nozzles is 3 to 12.
4. Magnetic rotating arc plasma spheroidization device according to claim 1, wherein the anode segment (4) is provided with a water-cooled jacket.
5. A magnetic rotating arc plasma spheroidizing apparatus according to claim 1, wherein the diameter of the spheroidizing chamber (6) is 2 to 10 times that of the anode segment (4).
6. A magnetic rotating arc plasma spheroidizing device according to claim 1 or 5, wherein the connecting section of the anode section (4) and the spheroidizing chamber (6) is gradually expanded in diameter from top to bottom.
7. A magnetic rotating arc plasma spheroidizing apparatus according to claim 1, wherein the gas curtain nozzle (6-1) is disposed downward;
the number of the air curtain nozzles (6-1) is 24-120, and the air curtain nozzles are uniformly distributed in the circumferential direction.
8. The magnetic rotating arc plasma spheroidizing apparatus according to claim 1, wherein the quenching nozzles (6-2) are uniformly distributed in the circumferential direction in a number of 24 to 180 toward the center of the spheroidizing chamber (6).
9. A magnetic rotating arc plasma spheroidizing apparatus according to claim 1, wherein the lower end of the spheroidizing chamber (6) is constricted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123017699.7U CN217018606U (en) | 2021-12-03 | 2021-12-03 | Magnetic rotating arc plasma spheroidizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123017699.7U CN217018606U (en) | 2021-12-03 | 2021-12-03 | Magnetic rotating arc plasma spheroidizing device |
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| Publication Number | Publication Date |
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| CN217018606U true CN217018606U (en) | 2022-07-22 |
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| CN202123017699.7U Active CN217018606U (en) | 2021-12-03 | 2021-12-03 | Magnetic rotating arc plasma spheroidizing device |
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| CN (1) | CN217018606U (en) |
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