CN110289160A - A kind of novel motor stator smc soft magnetic-powder core production equipment - Google Patents
A kind of novel motor stator smc soft magnetic-powder core production equipment Download PDFInfo
- Publication number
- CN110289160A CN110289160A CN201910607402.0A CN201910607402A CN110289160A CN 110289160 A CN110289160 A CN 110289160A CN 201910607402 A CN201910607402 A CN 201910607402A CN 110289160 A CN110289160 A CN 110289160A
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- shell
- grinding device
- soft magnetic
- powder core
- production equipment
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
-
- 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
Abstract
The invention discloses a kind of novel motor stator smc soft magnetic-powder core production equipments, including first shell and second shell, first shell upper top position is equipped with the first feed hopper, the corresponding first feed hopper position of first shell upper top offers feed inlet, first feed hopper is connected by feed inlet with first shell, first shell inner top feed inlet lower position is equipped with grinding device, promising grinding device is installed on right side wall in first shell, the crushing motor of power is provided, grinding device is equipped in first shell below grinding device, bottom position is equipped with loader in first shell below grinding device, loader is connected to by small expects pipe with grinding device, conveying pipeline is connected on loader.In the present invention, by the way that the grinding device of ball shape is arranged, when soft magnetism raw material is crushed, crushes the more traditional roll-type crushing of stroke or ball mill has all obtained significantly increasing, raw material is more sufficiently crushed, to ensure that the quality of soft magnetic-powder core.
Description
Technical field
The invention belongs to soft magnetic-powder core production equipment technology, specially a kind of novel motor stator smc soft magnetic-powder core
Production equipment.
Background technique
Soft magnetic-powder core is a kind of soft magnetic materials made of mixing compacting with dielectric as ferromagnetism powder.Due to ferromagnetism
Particle very little (use under high frequency is 0.5~5 micron), and being separated by non magnetic electrical insulating film substance therefore on the one hand can be with
Isolation vortex, material are suitable for upper frequency；On the other hand due to the channel effect between particle, cause material that there is low magnetic conduction
Rate and permanent permeance；Again due to particle size it is small, do not occur substantially collect skin phenomenon, magnetic conductivity with frequency variation also just compared with
For stabilization.
Due to its excellent characteristics that soft magnetic-powder core possesses, it is widely used in the stator production of motor and motor, but
It is due to its requirement in the preparation process of powder core, the fineness of magnetic powder has exact requirements, while in magnetic powder and dielectric
When mixing, more or less there is the case where stirring is uneven, and upper layer and lower layer cannot be sufficiently mixed in existing mixing plant, therefore
It is proposed that a kind of novel motor stator smc soft magnetic-powder core production equipment.
Summary of the invention
It is an object of the invention to: difficult in order to solve existing soft magnet powder production precision controlling, magnetic powder is mixed with dielectric
Uneven problem, provides a kind of novel motor stator smc soft magnetic-powder core production equipment.
The technical solution adopted by the invention is as follows:
A kind of novel motor stator smc soft magnetic-powder core production equipment, including first shell and second shell, the first shell
Body upper top position is equipped with the first feed hopper, and the corresponding first feed hopper position of the first shell upper top offers charging
Mouthful, the first feed hopper is connected by feed inlet with first shell, and first shell inner top feed inlet lower position, which is equipped with, to be crushed
Device installs promising grinding device on right side wall in first shell and provides the crushing motor of power, grinding device in first shell
Lower section is equipped with grinding device, and bottom position is equipped with loader in the first shell below grinding device, and loader passes through small powder
Pipe is connected to grinding device, conveying pipeline is connected on loader, conveying pipeline protrudes into second shell upper top far from loader one end
In second feed hopper of position installation, multiple helix tubes are installed in the feed inlet between second shell and the second feed hopper, the
Fixed plate is installed close to bottom position in two shells, bottom position is equipped with stirring motor in second shell below fixed plate,
Fixed plate is equipped with agitating shaft, and agitating shaft and stirring motor are sequentially connected, and agitating shaft passes through fixed plate and extends to top position, Gu
Stirring rod is installed, right side fixed plate top position offers discharge port in the second shell on the agitating shaft above fixed board.
Wherein, the grinding device includes half ball cover for being fixed on feed inlet lower position in first shell, on half ball cover
Top position offers through slot, is equipped with crushing ball in half ball cover, is meshed on crushing ball with being separately installed in half ball cover
Crushing tooth, left and right sides position offers through-hole respectively on half ball cover, through crushing shaft is movably equipped in through-hole, crushes and turns
Axis runs through crushing ball one end and connect with motor drive is crushed, and the other end is fixed on left side in first shell by bearing suit and corresponds to
On the side wall of position, crushes shaft and be mutually fixedly connected with crushing ball.
Wherein, the left and right sides is separately installed with small hopper, the charging below small hopper and the first feed hopper on the through slot
Mouth is connected, and small hopper is used to limit the whereabouts of soft magnetism raw material, avoids leaking.
Wherein, the grinding device includes the quarrel on the first shell inner sidewall being installed below grinding device, quarrel
Upper left and right sides position offers material-dropping hole, abrasive sheet is equipped with below quarrel, is respectively equipped with and is meshed on abrasive sheet and quarrel
Tooth lapping, abrasive sheet lower section are equipped with support plate, and close left and right sides position is separately installed with vibrating motor, vibration electricity in support plate
It is abutted against at the top of machine with abrasive sheet, is separately installed with limited block in the second shell of lower position at left and right sides of abrasive sheet, ground
Middle position offers blanking port respectively on plate and support plate, and the small expects pipe is correspondingly arranged on the blanking port in support plate.
Wherein, the first feed hopper upper bottom portion position is equipped with inlet valve, and inlet valve is filled according to grinding device and grinding
The falling amount for the practical smashing and grinding situation control raw material set.
Wherein, position is separately installed with ultrasonic transducer, the second shell at left and right sides of the fixed plate upper bottom portion
Position is separately installed with supersonic generator at left and right sides of interior bottom, and supersonic generator is electrically connected with ultrasonic transducer.
Wherein, fin is installed far from one end of the mixing shaft on the stirring rod, fin is inclined to set on stirring rod, wing
Piece, for stirring lower layer's raw material to upper layer in marginal position, promotes mixed effect when following stirring rod to be rotated.
Wherein, the loader is venturi feeder.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
1, in the present invention, soft magnetism raw material is carried out by primary comminution by setting grinding device, smashed raw material passes through again
It crosses grinding device and carries out thinner grinding, thus ensure that the production precision of soft magnet powder, soft magnet powder and insulation in second shell
When medium is mixed, the fin being obliquely installed on stirring rod scrapes the mixed raw material at second shell edge to centre in rotation
It is dynamic, while fin outstanding in turn ensures being sufficiently mixed for upper and lower level raw material in rotation again, so that soft magnet powder and dielectric
Mixed effect it is more preferable, be conducive to promote the soft magnetic-powder core quality produced.
2, the present invention in, by be arranged ball shape grinding device, when soft magnetism raw material is crushed, crush stroke compared with
Traditional roll-type crushes or ball mill has all obtained significantly increasing, and raw material is more fully crushed, thus
It ensure that the quality of soft magnetic-powder core.
3, in the present invention, multiple helix tubes are set in the feed inlet of second shell, when the second feed pipe puts into raw material,
Raw material enters helix tube, advances, finally falls down, when raw material is advanced in helix tube, due to spiral shell in helix tube inside spin
The travel speed of the architectural characteristic of coil, raw material is reduced, and soft magnet powder and dielectric are tentatively mixed, and avoids opening greatly
The generation of the case where charging of mouth, raw material is easy agglomerating bad mixing.
4, in the present invention, when raw material is mixed in stirring rod, the intracorporal ultrasonic transducer of second shell is issued
High-frequency ultrasonic carries out high-frequency vibration to the intracorporal raw material of second shell, makes pockets of raw material be easier to scatter, ensure that soft magnet powder
It is sufficiently wrapped up by dielectric, to ensure that the quality of soft magnetic-powder core.
Detailed description of the invention
Fig. 1 is structure schematic diagram of the invention；
Fig. 2 is the top view of fin in the present invention；
Fig. 3 is the structure schematic diagram of grinding device in the present invention；
Fig. 4 is the structure schematic diagram of grinding device in the present invention.
Marked in the figure: 1, first shell；2, grinding device；3, the first feed hopper；4, inlet valve；5, feed inlet；6, it crushes
Motor；7, grinding device；8, small expects pipe；9, loader；10, conveying pipeline；11, the second feed hopper；12, helix tube；13, second shell
Body；14, discharge port；15, stirring rod；16, ultrasonic transducer；17, supersonic generator；18, stirring motor；19, agitating shaft；
20, fixed plate；21, fin；22, small hopper；23, half ball cover；24, shaft is crushed；25, through-hole；26, crushing ball；27, it crushes
Tooth；28, through slot；29, quarrel；30, material-dropping hole；31, tooth lapping；32, abrasive sheet；33, vibrating motor；34, blanking port；35, it props up
Fagging；36, limited block.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention；In addition, unless otherwise specific regulation and
It limits, term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to detachable
Connection, or be integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, centre can also be passed through
Medium is indirectly connected, and can be the connection inside two elements.It for the ordinary skill in the art, can specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
Please refer to Fig. 1~4, a kind of novel motor stator smc soft magnetic-powder core production equipment, including first shell 1 and second
Shell 13, the 1 upper top position of first shell are equipped with the first feed hopper 3,3 upper bottom portion position of the first feed hopper be equipped with into
Expect valve 4, corresponding first feed hopper, 3 position of 1 upper top of first shell offers feed inlet 5, and the first feed hopper 3 passes through charging
Mouthfuls 5 are connected with first shell 1, and 1 inner top feed inlet of first shell, 5 lower position is equipped with grinding device 2, in first shell 1
Promising grinding device 2 is installed on right side wall, the crushing motor 6 of power is provided, is equipped with grinding in first shell 1 below grinding device 2
Device 7, bottom position is equipped with loader 9 in the first shell 1 of the lower section of grinding device 7, is connected with conveying pipeline on loader 9
10, conveying pipeline 10 is protruded into far from 9 one end of loader in the second feed hopper 11 of 13 upper top position of second shell installation, second shell
Multiple helix tubes 12 are installed in the feed inlet 5 between body 13 and the second feed hopper 11；
Fixed plate 20, bottom in 20 lower section second shell 13 of fixed plate are installed close to bottom position in the second shell 13
Portion position is equipped with stirring motor 18, and fixed plate 20 is equipped with agitating shaft 19, and agitating shaft 19 and stirring motor 18 are sequentially connected, stir
It mixes axis 19 and extends to top position across fixed plate 20, stirring rod 15 is installed on the agitating shaft 19 of 20 top of fixed plate, is stirred
Fin 21 is installed far from 19 one end of agitating shaft on bar 15, fin 21 is obliquely installed on stirring rod 15, in the fixed plate 20
Position is separately installed with ultrasonic transducer 16 at left and right sides of bottom, position difference at left and right sides of bottom in the second shell 13
Supersonic generator 17 is installed, supersonic generator 17 is electrically connected with ultrasonic transducer 16, and the grinding device 2 includes solid
It is scheduled on half ball cover 23 of 5 lower position of feed inlet in first shell 1, half ball cover, 23 upper top position offers through slot 28, through slot
The left and right sides is separately installed with small hopper 22 on 28, and small hopper 22 is connected with feed inlet 5；
Be equipped with crushing ball 26 in half ball cover 23, on crushing ball 26 be separately installed with the powder being meshed in half ball cover 23
Broken tooth 27, left and right sides position offers through-hole 25 respectively on half ball cover 23, crushes shaft 24 through being movably equipped in through-hole 25,
Shaft 24 is crushed through 26 one end of crushing ball and crushes the transmission connection of motor 6, the other end is fixed on first shell by bearing suit
It in body 1 on the side wall of left side corresponding position, crushes shaft 24 and is fixedly connected with 26 phase of crushing ball, the grinding device 7 includes peace
Loaded on the quarrel 29 on 1 inner sidewall of first shell below grinding device 2, left and right sides position offers material-dropping hole on quarrel 29
30, it is equipped with abrasive sheet 32 below quarrel 29, is respectively equipped with the tooth lapping 31 being meshed, abrasive sheet 32 on abrasive sheet 32 and quarrel 29
Lower section is equipped with support plate 35, and close left and right sides position is separately installed with vibrating motor 33 in support plate 35, and vibrating motor 33 pushes up
Portion is abutted against with abrasive sheet 32, is separately installed with limited block 36 in the second shell 13 of 32 left and right sides lower position of abrasive sheet,
Middle position offers blanking port 34 respectively on abrasive sheet 32 and support plate 35, and the small expects pipe 8 is correspondingly arranged at support plate 35
On blanking port 34 on.
Working principle: the present invention provides a kind of novel motor stator smc soft magnetic-powder core production equipment, and structure setting is ingenious,
Soft magnetism raw material is poured into when use into the first feed hopper 3, soft magnetism raw material falls into half in the second grinding device 2 by feed inlet 5
In between ball cover 23 and crushing ball 26, crushes the energization of motor 6 and crushing shaft 24 is driven to be rotated, crush the further band of shaft 24
Dynamic crushing ball 26 is rotated, and is crushed with the crushing tooth 27 in half ball cover 23 to soft magnetism raw material on crushing ball 26, by powder
Broken soft magnetism raw material is fallen from half ball cover, 23 bottom, is fallen on quarrel 29, due to the incline structure characteristic of quarrel 29, soft magnetism raw material
Two sides slide to the left and right on quarrel 29, finally fall between quarrel 29 and abrasive sheet 32 from the through-hole 30 on quarrel 29, vibrate
Motor 33, which is powered on, drives abrasive sheet 32 constantly to be vibrated, on abrasive sheet 32 with the tooth lapping 31 that is engaged on quarrel 29 due to
Vibration constantly stings and cuts soft magnetism raw material, is ground, simultaneously because the incline structure of abrasive sheet 32 is arranged, the soft magnetism for grinding completion is former
Expect finally to fall from blanking port 34 to centre movement, the second feed hopper is delivered to by conveying pipeline 10 by the loader 9 of injecting type
In 11, the synchronous dielectric that is added forms mixture in the second feed hopper 11, mixture by helix tube 12 circulation and just
It is fallen in second shell 13 after step mixing, stirring motor 18, which is powered on, drives agitating shaft 19 to rotate, stirring on agitating shaft 19
It mixes bar 15 and mixing is stirred to mixture, while the energization of supersonic generator 17 of bottom issues specific electricity in second shell 13
Frequency is converted to ultrasonic wave through ultrasonic transducer 16, and ultrasonic wave carries out high-frequency vibration to the mixture in second shell 13, makes into
The mixture of group scatters, and guarantees mixing sufficiently, mixes the release second shell of stirring rod 15 that the soft magnetic-powder core raw material of completion is inverted
Body 13, fulfils assignment.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of novel motor stator smc soft magnetic-powder core production equipment, including first shell (1) and second shell (13), special
Sign is that first shell (1) the upper top position is equipped with the first feed hopper (3), and first shell (1) upper top is corresponding
First feed hopper (3) position offers feed inlet (5), and the first feed hopper (3) is connected by feed inlet (5) with first shell (1)
Logical, first shell (1) inner top feed inlet (5) lower position is equipped with grinding device (2), pacifies on first shell (1) interior right side wall
Equipped with the crushing motor (6) of power is provided for grinding device (2), grinding dress is equipped with below first shell (1) interior grinding device (2)
It sets (7), first shell (1) interior bottom position below grinding device (7) is equipped with loader (9), and loader (9) passes through small powder
Pipe (8) is connected to grinding device (7)；
It is connected with conveying pipeline (10) on the loader (9), conveying pipeline (10) protrudes into second shell far from loader (9) one end
(13) in the second feed hopper (11) of upper top position installation, the feed inlet between second shell (13) and the second feed hopper (11)
(5) it is equipped with multiple helix tubes (12) in, fixed plate (20), fixed plate is installed close to bottom position in second shell (13)
(20) lower section second shell (13) interior bottom position is equipped with stirring motor (18), and fixed plate (20) is equipped with agitating shaft (19),
Agitating shaft (19) and stirring motor (18) are sequentially connected, and agitating shaft (19) passes through fixed plate (20) and extends to top position, fixed
It is equipped with stirring rod (15) on agitating shaft (19) above plate (20), on the second shell (13) above right side fixed plate (20)
Position offers discharge port (14).
2. a kind of novel motor stator smc soft magnetic-powder core production equipment as described in claim 1, which is characterized in that the powder
Crushing device (2) includes half ball cover (23) for being fixed on first shell (1) interior feed inlet (5) lower position, and half ball cover pushes up on (23)
Portion position offers through slot (28), is equipped with crushing ball (26) in half ball cover (23), on crushing ball (26) with half ball cover (23)
It is inside separately installed with the crushing tooth (27) being meshed, left and right sides position offers through-hole (25) respectively on half ball cover (23), leads to
Through crushing shaft (24) is movably equipped in hole (25), shaft (24) are crushed through crushing ball (26) one end and crush motor (6)
Transmission connection, the other end are fixed in first shell (1) on the side wall of left side corresponding position by bearing suit, crush shaft
(24) it is mutually fixedly connected with crushing ball (26).
3. a kind of novel motor stator smc soft magnetic-powder core production equipment as claimed in claim 2, which is characterized in that described logical
The left and right sides is separately installed with small hopper (22) on slot (28), the feed inlet (5) below small hopper (22) and the first feed hopper (3)
It is connected.
4. a kind of novel motor stator smc soft magnetic-powder core production equipment as described in claim 1, which is characterized in that described to grind
Mill apparatus (7) includes the quarrel (29) that is installed on first shell (1) inner sidewall below grinding device (2), on quarrel (29)
Left and right sides position offers material-dropping hole (30), is equipped with abrasive sheet (32) below quarrel (29), abrasive sheet (32) and quarrel (29)
On be respectively equipped with the tooth lapping (31) being meshed, support plate (35) are equipped with below abrasive sheet (32), close to left in support plate (35)
Right two side positions are separately installed with vibrating motor (33), are abutted against at the top of vibrating motor (33) with abrasive sheet (32), abrasive sheet
(32) it is separately installed with limited block (36) in the second shell (13) of left and right sides lower position, abrasive sheet (32) and support plate
(35) middle position offers blanking port (34) respectively on, and the small expects pipe (8) is correspondingly arranged at the blanking on support plate (35)
On mouth (34).
5. a kind of novel motor stator smc soft magnetic-powder core production equipment as claimed in claim 3, which is characterized in that described the
One feed hopper (3) upper bottom portion position is equipped with inlet valve (4).
6. a kind of novel motor stator smc soft magnetic-powder core production equipment as described in Claims 1 to 5 is any, which is characterized in that
Position is separately installed with ultrasonic transducer (16) at left and right sides of fixed plate (20) upper bottom portion, in the second shell (13)
Position is separately installed with supersonic generator (17) at left and right sides of bottom, supersonic generator (17) and ultrasonic transducer (16)
Electrical connection.
7. a kind of novel motor stator smc soft magnetic-powder core production equipment as claimed in claim 6, which is characterized in that described to stir
It mixes and is equipped with fin (21) on bar (15) far from agitating shaft (19) one end, fin (21) is inclined to set on stirring rod (15).
8. a kind of novel motor stator smc soft magnetic-powder core production equipment as claimed in claim 7, which is characterized in that the confession
Glassware (9) is venturi feeder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910607402.0A CN110289160B (en) | 2019-07-07 | 2019-07-07 | Motor stator smc soft magnetic powder core production facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910607402.0A CN110289160B (en) | 2019-07-07 | 2019-07-07 | Motor stator smc soft magnetic powder core production facility |
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| Publication Number | Publication Date |
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| CN110289160A true CN110289160A (en) | 2019-09-27 |
| CN110289160B CN110289160B (en) | 2021-02-09 |
Family
ID=68020787
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910607402.0A Active CN110289160B (en) | 2019-07-07 | 2019-07-07 | Motor stator smc soft magnetic powder core production facility |
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| Country | Link |
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| CN (1) | CN110289160B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112071546A (en) * | 2020-09-01 | 2020-12-11 | 安徽省瀚海新材料股份有限公司 | Processing method for producing modified neodymium-iron-boron magnet by using neodymium-iron-boron waste |
| CN114242440A (en) * | 2021-12-31 | 2022-03-25 | 浙江先丰电子科技有限公司 | Method and equipment for processing surface mount type inductive magnetic core with high processing efficiency |
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| CN114242440A (en) * | 2021-12-31 | 2022-03-25 | 浙江先丰电子科技有限公司 | Method and equipment for processing surface mount type inductive magnetic core with high processing efficiency |
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| Publication number | Publication date |
|---|---|
| CN110289160B (en) | 2021-02-09 |
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