CN116798725A - Magnetic component embedded with halbach array magnet and preparation method thereof - Google Patents
Magnetic component embedded with halbach array magnet and preparation method thereof Download PDFInfo
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- CN116798725A CN116798725A CN202310918681.9A CN202310918681A CN116798725A CN 116798725 A CN116798725 A CN 116798725A CN 202310918681 A CN202310918681 A CN 202310918681A CN 116798725 A CN116798725 A CN 116798725A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000003365 glass fiber Substances 0.000 claims abstract description 35
- 230000005415 magnetization Effects 0.000 claims abstract description 30
- 239000012943 hotmelt Substances 0.000 claims abstract description 20
- 238000009757 thermoplastic moulding Methods 0.000 claims abstract description 14
- 238000007731 hot pressing Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000011265 semifinished product Substances 0.000 claims description 13
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 239000000047 product Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The application relates to a magnetic component embedded with halbach array magnets and a preparation method thereof, wherein the magnetic component comprises a glass fiber board, halbach array magnets are filled in grooves of the glass fiber board, and a hot-melt cover plate is arranged on the upper side of the glass fiber board; the halbach array magnets comprise first magnets and second magnets, the first magnets and the second magnets are sequentially and alternately arranged along the width direction, the first magnets are magnetized according to the magnetization direction before being assembled with the second magnets, and after the hot-melt cover plate is formed by hot-melt thermoplastic molding, the second magnets in the halbach array magnets on the glass fiber plate are magnetized; according to the magnetic component embedded with the halbach array magnet and the preparation method thereof, the force in the vertical direction is not needed to be overcome in the bonding, fixing and pushing process, the assembly thickness can be greatly reduced, the yield is high, and the flatness is good; the second magnet is magnetized after the high-temperature hot-pressing process, the cost of the whole magnetic steel is lower, the magnetic attenuation of the second magnet is lower, and the whole benefit can be exerted maximally.
Description
Technical Field
The application relates to a magnet manufacturing technology, in particular to a magnetic component embedded with halbach array magnets and a preparation method thereof.
Background
Halbach Array (Halbach Array) is a magnet structure, which is an approximately ideal structure in engineering, and the permanent magnets with different magnetization directions are arranged in a certain order, so that the magnetic field on one side of the Array is significantly enhanced and the magnetic field on the other side is significantly reduced, and the goal is to generate the strongest magnetic field in the working area with the least amount of magnets. When the prior halbach array magnet assembly is manufactured, the prior halbach array magnet assembly is firstly processed into magnets with specific sizes and magnetization directions, then the magnets are magnetized according to the designated magnetization directions, then the halbach array assembly is carried out, and the magnetized magnets are bonded together by glue to form the magnet assembly with specific magnetic field distribution. Because each magnet after magnetizing has a specific magnetization direction, when the arrangement directions of the magnets are different, a large repulsive force and a large rotation moment exist between the magnets, and great difficulty is brought to assembly.
The assembly process method of the halbach array magnet assembly disclosed by publication No. CN111009407A adopts a mode of assembling firstly and then magnetizing to assemble, so that the assembly difficulty is greatly reduced, the influence of repulsive force is avoided, the safety coefficient of staff operation is increased, and the safety and the efficiency are greatly improved. However, since the halbach array magnet generally includes two sets of magnets having mutually perpendicular magnet magnetization directions, it is technically difficult to magnetize the two sets of magnets having mutually perpendicular magnetization directions, respectively. In addition, when the magnet assembly is subjected to subsequent processing, there is a case where heat treatment is required, and the heat treatment may cause demagnetization of the magnetic field of the magnetized magnet, resulting in a decrease in the magnetic field strength of the magnet.
Disclosure of Invention
The application aims to provide a magnetic component embedded with a halbach array magnet and a preparation method thereof, which are used for solving the problem that the prior halbach array magnet is difficult to assemble and manufacture.
In order to solve the problems, the application provides a magnetic component with embedded halbach array magnets, which comprises a glass fiber board, wherein a plurality of grooves for accommodating the magnets are formed in the glass fiber board, halbach array magnets are filled in the grooves, and a hot-melt cover plate for covering the grooves is further arranged on the upper side of the glass fiber board; the halbach array magnet comprises a first magnet and a second magnet which are rectangular and sheet-shaped and have the same thickness, the lengths of the first magnet and the second magnet are the same, the first magnet and the second magnet are sequentially and alternately arranged along the width direction, the magnetization direction of the first magnet is horizontal along the width direction, and the magnetization direction of the second magnet is vertical along the thickness direction; the width of the first magnet is more than or equal to 2 times the thickness of the first magnet, and the width of the first magnet is less than or equal to 3 times the thickness of the first magnet; the width of the second magnet is 1.5 times or more and 2.5 times or less of the width of the first magnet; the first magnets and the second magnets are magnetized according to the magnetization direction before being assembled, the halbach array magnets are placed in the grooves of the glass fiber board and covered by the hot-melt cover plate in a hot-melt mode, and then the second magnets in the halbach array magnets on the glass fiber board are magnetized.
Further, the number of first magnets is greater than the number of second magnets.
Further, the number of the first magnets is 2, and the number of the second magnets is 1; or the number of the first magnets is 3, and the number of the second magnets is 2.
Further, the length of the first magnet is 3 times or more and 6 times or less of the width of the first magnet.
The application provides a preparation method of a magnetic component embedded with halbach array magnets, which is characterized by comprising the following steps:
s10, processing a first magnet and a second magnet which are rectangular and sheet-shaped, have the same length and the same thickness to a specified size;
s20, carrying out saturation magnetization on the first magnet along the width direction of the first magnet;
s30, sequentially and alternately arranging the magnetized first magnets and the non-magnetized second magnets along the width direction according to the halbach array, and adhering and fixing to form a semi-finished product assembly, so that the magnetic field of the first magnets is horizontal, and the magnetization direction of the second magnets is vertical;
s40, sequentially placing the semi-finished product assemblies in grooves of the glass fiber plates, and then covering a hot-melt cover plate on the upper sides of the glass fiber plates; then, hot-pressing at high temperature to enable the hot-melt cover plate to be in thermoplastic molding and bonding fixation on the upper side of the glass fiber plate, and wrapping and fixing each semi-finished product assembly in the groove;
s50, placing the glass fiber plates subjected to high-temperature hot pressing into magnetizing equipment, and performing saturation magnetization on second magnets in the semi-finished product assemblies in the glass fiber plates according to magnetization directions, wherein iron cores of the magnetizing heads in the magnetizing equipment are arranged corresponding to the second magnets.
Further, the high temperature hot press temperature for the thermoplastic molding in the step S40 is 150 to 170 ℃.
Further, the high temperature hot pressing temperature of the thermoplastic molding in the step S40 is 160 ℃.
Further, in the step S50, the number of cores in the magnetizing head is the same as the number of the second magnets in the semi-finished assembly.
The application has the following beneficial effects: the first magnet (auxiliary magnet) is firstly saturated and magnetized before being assembled, the first magnet (auxiliary magnet) and the second magnet (main magnet) are fixedly bonded according to the halbach array and then the second magnet (main magnet) is magnetized, the force in the vertical direction is not needed to be overcome in the bonding, fixing and pushing process, the assembly thickness can be greatly reduced, the yield is high, and the flatness is good; the post-magnetizing scheme can magnetize the main magnet after the assembly process with higher temperature, the magnetic attenuation is far smaller than that of the pre-magnetizing high-temperature assembly, and the benefit of halbach can be exerted to the maximum extent; the magnetic component embedded with the halbach array magnets is covered with the hot-melt cover plate and subjected to thermoplastic molding, then the second magnets in the halbach array magnets are magnetized, the first magnets (auxiliary magnets) need to use magnetic steel with higher intrinsic coercivity, the second magnets (main magnets) can use magnetic steel with lower intrinsic coercivity, after the magnetic component is assembled at a high temperature, the second magnets (main magnets) are magnetized, the overall magnetic steel cost is lower, the magnetic attenuation of the second magnets (main magnets) is lower, and the overall benefit can be exerted maximally.
Drawings
FIG. 1 is a schematic diagram of a magnetic assembly of an embodiment of the present application with a magnet embedded in a halbach array;
fig. 2 is a schematic structural view of a halbach array magnet according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the magnetic field distribution of a halbach array magnet in an embodiment of the application;
FIG. 4 is a graph showing the magnetic attraction data of a prior art magnet using an NS array;
FIG. 5 is non-magnetic decay magnetic attraction data of a halbach array magnet in an embodiment of the application;
FIG. 6 is minimum decay magnetic attraction data for a halbach array magnet in an embodiment of the application;
FIG. 7 is average decay magnetic attraction data of a halbach array magnet in an embodiment of the application;
FIG. 8 is the maximum decay magnetic attraction data for a halbach array magnet in an embodiment of the application;
FIG. 9 is a prior art force application during a fixed push-on process using pre-magnetizing assembly;
fig. 10 shows the stress condition of the halbach array magnet in the embodiment of the application when the halbach array magnet is fixedly pushed.
Detailed Description
The application will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
In the embodiment of the magnetic assembly of the embedded halbach array magnet of the present application shown in fig. 1 to 10, the magnetic assembly of the embedded halbach array magnet includes a glass fiber board 30, a plurality of grooves 31 for accommodating the magnet are formed in the glass fiber board 30, the halbach array magnet is filled in each groove 31, and a hot-melt cover plate (not shown in the figure) for covering each groove 31 is further arranged on the upper side of the glass fiber board 30; as shown in fig. 2, the halbach array magnet in each groove 31 includes a first magnet 10 and a second magnet 20 which are rectangular sheet-shaped and have the same thickness, the first magnet 10 is used as an auxiliary magnet, the second magnet 20 is used as a main magnet, the lengths of the first magnet 10 and the second magnet 20 are the same, the first magnet 10 and the second magnet 20 are alternately arranged in sequence along the width direction, the magnetization direction of the first magnet 10 is horizontal along the width direction, and the magnetization direction of the second magnet 20 is vertical along the thickness direction; the width of the first magnet is greater than or equal to 2 times the thickness of the first magnet, and the width of the first magnet 10 is less than or equal to 3 times the thickness of the first magnet 10; the width of the second magnet 20 is 1.5 times or more and 2.5 times or less of the width of the first magnet 20; before the first magnet 10 and the second magnet 20 are assembled, the first magnet is magnetized 10 according to the magnetization direction, and after the halbach array magnets are placed in the grooves 31 of the glass fiber board 30 and covered by the hot melt cover plate through thermoplastic molding, the second magnet 20 in the halbach array magnets on the glass fiber board 30 is magnetized.
According to the magnetic component embedded with the halbach array magnet, saturation magnetization is carried out before the first magnet (auxiliary magnet) is assembled, the first magnet (auxiliary magnet) and the second magnet (main magnet) are bonded and fixed according to the halbach array, then the second magnet (main magnet) is magnetized, the force in the vertical direction is not needed to be overcome in the bonding, fixing and pushing process, the assembly thickness can be greatly reduced, and the finished product rate is high and the flatness is good; the post-magnetizing scheme can magnetize the main magnet after the assembly process with higher temperature, the magnetic attenuation is far smaller than that of the pre-magnetizing high-temperature assembly, and the benefit of halbach can be exerted to the maximum extent; the magnetic component embedded with the halbach array magnets is covered with the hot-melt cover plate and subjected to thermoplastic molding, then the second magnets in the halbach array magnets are magnetized, the first magnets (auxiliary magnets) need to use magnetic steel with higher intrinsic coercivity, the second magnets (main magnets) can use magnetic steel with lower intrinsic coercivity, after the magnetic component is assembled at a high temperature, the second magnets (main magnets) are magnetized, the overall magnetic steel cost is lower, the magnetic attenuation of the second magnets (main magnets) is lower, and the overall benefit can be exerted maximally.
In one embodiment of the present application, the number of first magnets 10 is preferably greater than the number of second magnets 20; preferably, the number of the first magnets 10 is 2, and the number of the second magnets 20 is 1; in one embodiment of the present application, preferably, as shown in fig. 1, the number of the first magnets 10 is 3, the number of the second magnets 20 is 2, the first magnets 10 are magnetized before assembly, and then the second magnets are magnetized after assembly, as shown in fig. 1, the direction of the magnetic field of the second magnets after magnetization is vertical, and the second magnets (main magnets) in the assembled semi-finished product assembly can be conveniently magnetized by using a magnetizing device.
In one embodiment of the present application, it is preferable that the length of the first magnet 10 is 3 times or more and 6 times or less of the width of the first magnet 10; in one embodiment of the present application, as shown in fig. 1, the first magnet 10 (auxiliary magnet) has a size of 7.5×3.4×0.7 (long×wide×thick), and the second magnet 20 (main magnet) has a size of 7.5×1.8×0.7 (long×wide×thickness in the magnetizing direction). Specifically, the overall size is designed according to the overall size of the product, the length, width and magnetizing thickness of the main magnet and the auxiliary magnet are all dependent on the size of the product to be designed, the thickness of the auxiliary magnet in the magnetizing direction needs to be paid attention to in the overall size matching, the thickness of the auxiliary magnet in the magnetizing direction is not too long (the longer auxiliary magnet sacrifices the larger adsorption area of the main magnet), but the Pc value of the auxiliary magnet needs to be kept to be 1.2 or even 1.4 or more, so that the Pc value of the auxiliary magnet is increased as much as possible under the condition of sacrificing the adsorption area of the main magnet as much as possible, the temperature resistance of the auxiliary magnet is enhanced, and the whole length minus the length of the auxiliary magnet in the magnetizing direction is divided by the number of the main magnet, namely the width/length of the main magnet.
The application provides a preparation method of a halbach array magnet, which comprises the following steps:
s10, processing a first magnet and a second magnet which are rectangular and sheet-shaped, have the same length and the same thickness to a specified size;
s20, carrying out saturation magnetization on the first magnet along the width direction of the first magnet;
s30, sequentially and alternately arranging the magnetized first magnets and the non-magnetized second magnets along the width direction according to the halbach array, and adhering and fixing to form a semi-finished product assembly, so that the magnetic field of the first magnets is horizontal, and the magnetization direction of the second magnets is vertical;
s40, sequentially placing the semi-finished product assemblies in grooves of the glass fiber plates, and then covering a hot-melt cover plate on the upper sides of the glass fiber plates; then, hot-pressing at high temperature to enable the hot-melt cover plate to be in thermoplastic molding and bonding fixation on the upper side of the glass fiber plate, and wrapping and fixing each semi-finished product assembly in the groove;
s50, placing the glass fiber plates subjected to high-temperature hot pressing into magnetizing equipment, and performing saturation magnetization on second magnets in the semi-finished product assemblies in the glass fiber plates according to magnetization directions, wherein iron cores of the magnetizing heads in the magnetizing equipment are arranged corresponding to the second magnets.
In one embodiment of the present application, preferably, the high temperature hot-pressing temperature for the thermoplastic molding of the step S40 is 150 ℃ to 170 ℃; in one embodiment of the present application, preferably, the hot-pressing temperature of the thermoplastic molding in the step S40 is 160 ℃, specifically, the hot-melt cover plate is usually made of glass fiber, the hot-pressing temperature required for the thermoplastic molding is 150 ℃ to 170 ℃, in this temperature range, most of the magnetic materials have higher magnetic attenuation, in order to reduce the influence of the high temperature on the magnet, the magnetic steel with higher intrinsic coercivity is usually required, which results in significantly higher cost of the magnetic steel.
In one embodiment of the present application, preferably, in the step S50, the number of cores in the magnetizing head is the same as the number of the second magnets in the semi-finished assembly; specifically, the winding coil on the iron core of the charging head is arranged corresponding to the first magnet, namely, the winding coil corresponds to a gap between two adjacent second magnet supports, and the second magnet is charged and the magnetic field attenuation of the charged first magnet is reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. The magnetic component with the embedded halbach array magnets comprises a glass fiber board, and is characterized in that a plurality of grooves for accommodating the magnets are formed in the glass fiber board, the halbach array magnets are filled in the grooves, and a hot-melt cover plate for covering the grooves is further arranged on the upper side of the glass fiber board; the halbach array magnet comprises a first magnet and a second magnet which are rectangular and sheet-shaped and have the same thickness, the lengths of the first magnet and the second magnet are the same, the first magnet and the second magnet are sequentially and alternately arranged along the width direction, the magnetization direction of the first magnet is horizontal along the width direction, and the magnetization direction of the second magnet is vertical along the thickness direction; the width of the first magnet is more than or equal to 2 times the thickness of the first magnet, and the width of the first magnet is less than or equal to 3 times the thickness of the first magnet; the width of the second magnet is 1.5 times or more and 2.5 times or less of the width of the first magnet; the first magnets and the second magnets are magnetized according to the magnetization direction before being assembled, the halbach array magnets are placed in the grooves of the glass fiber board and covered by the hot-melt cover plate in a hot-melt mode, and then the second magnets in the halbach array magnets on the glass fiber board are magnetized.
2. The magnetic assembly of the embedded halbach array magnet of claim 1, wherein: the number of first magnets is greater than the number of second magnets.
3. The magnetic assembly of the embedded halbach array magnet of claim 2, wherein: the number of the first magnets is 2, and the number of the second magnets is 1; or the number of the first magnets is 3, and the number of the second magnets is 2.
4. The magnetic assembly of the embedded halbach array magnet of claim 1, wherein: the length of the first magnet is 3 times or more and 6 times or less of the width of the first magnet.
5. A preparation method of a magnetic component embedded with halbach array magnets is characterized by comprising the following steps of: the method comprises the following steps: s10, processing a first magnet and a second magnet which are rectangular and sheet-shaped, have the same length and the same thickness to a specified size; s20, carrying out saturation magnetization on the first magnet along the width direction of the first magnet; s30, sequentially and alternately arranging the magnetized first magnets and the non-magnetized second magnets along the width direction according to the halbach array, and adhering and fixing to form a semi-finished product assembly, so that the magnetic field of the first magnets is horizontal, and the magnetization direction of the second magnets is vertical; s40, sequentially placing the semi-finished product assemblies in grooves of the glass fiber plates, and then covering a hot-melt cover plate on the upper sides of the glass fiber plates; then, hot-pressing at high temperature to enable the hot-melt cover plate to be in thermoplastic molding and bonding fixation on the upper side of the glass fiber plate, and wrapping and fixing each semi-finished product assembly in the groove; s50, placing the glass fiber plates subjected to high-temperature hot pressing into magnetizing equipment, and performing saturation magnetization on second magnets in the semi-finished product assemblies in the glass fiber plates according to magnetization directions, wherein iron cores of the magnetizing heads in the magnetizing equipment are arranged corresponding to the second magnets.
6. The method for preparing a magnetic assembly of an embedded halbach array magnet of claim 5, wherein: the high temperature hot pressing temperature for thermoplastic molding in the step S40 is 150-170 ℃.
7. The method of manufacturing a magnetic assembly for a magnet of an embedded halbach array of claim 6, wherein: the high-temperature hot-pressing temperature for thermoplastic molding in the step S40 is 160 ℃.
8. The method for preparing a magnetic assembly of an embedded halbach array magnet of claim 5, wherein: in the step S50, the number of cores in the magnetizing head is the same as the number of second magnets in the semi-finished assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310918681.9A CN116798725A (en) | 2023-07-25 | 2023-07-25 | Magnetic component embedded with halbach array magnet and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310918681.9A CN116798725A (en) | 2023-07-25 | 2023-07-25 | Magnetic component embedded with halbach array magnet and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116798725A true CN116798725A (en) | 2023-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310918681.9A Pending CN116798725A (en) | 2023-07-25 | 2023-07-25 | Magnetic component embedded with halbach array magnet and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116798725A (en) |
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2023
- 2023-07-25 CN CN202310918681.9A patent/CN116798725A/en active Pending
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