CN109678480B - Method for preparing magnetic core by ferrite material - Google Patents
Method for preparing magnetic core by ferrite material Download PDFInfo
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- CN109678480B CN109678480B CN201910093677.7A CN201910093677A CN109678480B CN 109678480 B CN109678480 B CN 109678480B CN 201910093677 A CN201910093677 A CN 201910093677A CN 109678480 B CN109678480 B CN 109678480B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2658—Other ferrites containing manganese or zinc, e.g. Mn-Zn ferrites
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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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
- H01F1/34—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 non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3262—Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
- C04B2235/3263—Mn3O4
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3284—Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
Abstract
The invention discloses a method for preparing a magnetic core by using a ferrite material, which comprises a main material and an auxiliary material, and the preparation steps comprise: s1, mixing treatment: weighing the main component raw material Fe according to the proportion2O3、ZnO、Mn3O4Mixing in a vibration mill for 60-100 min; s2, pre-burning treatment: presintering the mixed material in a rotary kiln for 75-95min, wherein the temperature in the rotary kiln is 800-1150 ℃, and then cooling; s2, sanding: adding an additive into the pre-sintered powder, and sanding for 30-150 minutes; then adding alcohol solution and stirring for 75-120 min; s2, spray granulation; and S2, molding. The ferrite material provided by the invention has initial permeability of more than 3000 at normal temperature, bulk resistivity of more than 300 omega M, and excellent impedance characteristic in a frequency range of 1-100M, and the magnetic core made of the ferrite material can effectively reduce the electromagnetic wave interference of electronic equipment.
Description
Technical Field
The invention belongs to the technical field of soft magnetic Interference (EMI), and particularly relates to a method for preparing a magnetic core by using a ferrite material.
Background
With the increasing development of electronic technology, especially the development of digital technology, the EMI resistance of electronic equipment is very important, and how to effectively reduce the electromagnetic wave interference of electronic equipment becomes a problem generally concerned by researchers. Various EMI inhibiting components (such as magnetic cores) made of soft magnetic ferrite are widely applied to various electronic equipment to prevent feedback and coupling of unwanted signals and avoid parasitic oscillation, so that conduction and radiation noise are effectively inhibited; the material becomes an indispensable component of a plurality of emerging IT technologies, and the market demand for high-permeability materials is increasing.
There are two types of existing EMI-resistant ferrite materials: one is composed ofThe Mn-Zn ferrite material with Fe2O3 over 50mol% has high initial magnetic permeability up to 5000 and over, high impedance in the frequency range of 100K to 5M, and high Fe content2O3When the content exceeds 50mol, the volume resistivity is low, the frequency is over 5M, and the impedance value is low; one is a nickel zinc or magnesium zinc ferrite having a composition in which Fe2O3 is less than 50mol%, and has a low initial permeability, often less than 2000, and a low impedance value at a frequency of 100K to 5M, but has a high volume resistivity of 10000. omega. M or more because of its iron-deficient formulation, and a high impedance value at a frequency of 25M or more.
Disclosure of Invention
The invention provides a method for preparing a magnetic core by using a ferrite material with high impedance value, high resistivity and the like in order to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for preparing a magnetic core by using ferrite materials comprises main materials and auxiliary materials, and the preparation steps comprise:
s1, mixing treatment: weighing main component raw materials Fe2O3, ZnO and Mn according to proportion3O4Mixing in a vibration mill for 60-100 min;
s2, pre-burning treatment: presintering the mixed material in a rotary kiln for 75-95min, wherein the temperature in the rotary kiln is 800-1150 ℃, and then cooling;
s2, sanding: adding an additive into the pre-sintered powder, and sanding for 30-150 minutes; then adding alcohol solution and stirring for 75-120 min;
s2, spray granulation;
s2, molding;
s2, sintering treatment: and sintering the formed blank in an atmosphere with the oxygen content of 100ppm-21.00%, wherein the sintering temperature is 1200-1450 ℃, the sintering heat preservation time is 12-18 hours, and cooling to the room temperature in a nitrogen saturated atmosphere to obtain the ferrite material.
Preferably, the composition of the host material component Fe in step S12O342.5-48.8mol%, ZnO 25-28mol% and the restMn3O4。
Preferably, the total weight of the auxiliary materials comprises 7000ppm of CoO 3000-.
Preferably, the additive comprises 600ppm to 1300ppm of dispersant, 12 to 18wt% of adhesive and 6 to 500ppm of defoaming agent based on the total weight of the main components.
Preferably, the alcoholic solution is a PVA solution.
Preferably, the nitrogen gas burning kiln includes the kiln body, is used for entering into the internal feed arrangement and discharging device of kiln to promoting the magnetic core, the internal conveying component that is used for with the magnetic core by kiln body one end is carried to the other end, is used for heating a plurality of heater block of the internal air of kiln, is used for to the internal gas supply part of input gas of kiln and is used for reducing cooling part of kiln body one end temperature in order to cool off the magnetic core that is equipped with of kiln, cooling part locates kiln body one end.
Preferably, the conveying component comprises a bracket arranged in the kiln body, a crawler arranged on the bracket, a driving structure for driving the crawler to rotate and a track for supporting the crawler, and the track is arranged on the bracket; through setting up the track, when it is in the kiln body, it has high temperature resistant characteristic, and it can be under the stable operation of a thousand more degrees and can not take place deformation to because what set up is the track, it still can form smooth plane at the pivoted in-process, thereby can realize that support piece supports at this in-process, guarantee support piece's supporting effect.
Preferably, the crawler comprises a plurality of first cross bars and a plurality of second cross bars arranged at intervals with the first cross bars, and the first cross bars are movably connected with the second cross bars; establish the track into first horizontal pole and second horizontal pole, it can be convenient for the track takes place deformation in the use to realize that the track carries out reciprocating rotation, and first, second horizontal pole can form smooth plane, can carry out good support to the backup pad.
Preferably, the conveying component further comprises a supporting plate for placing the magnetic core, a disc-shaped tooth block is arranged on the supporting plate, and a rack matched with the tooth block is arranged on the support; through setting up the rack can with the tooth piece between intermeshing, therefore the backup pad is rotatable, realizes the rotatory process in limit heating limit for it is even to be heated as far as at the in-process magnetic core of heating, keeps the shaping effect after the magnetic core heating.
Preferably, the upper end surface of the crawler is recessed downwards to form an annular rotating concave track, a plurality of first balls are arranged in the concave track, second balls with the diameter larger than that of the first balls are arranged on the crawler, and a recessed part matched with the second balls is arranged in the middle of the tooth block; the second ball is arranged to be in contact with the concave part, so that the whole tooth block can be supported; the first ball can support the edge of the tooth block, so that when the tooth block is contacted with the rack, the whole support plate can rotate and can drive the magnetic core to rotate on the track; and set up the depressed part in the backup pad, it can be convenient for the second ball be located in the depressed part to the restriction backup pad takes place to remove, keeps the backup pad at the in-process of motion along with track synchronous motion, ensures the synchronism of motion between track and the backup pad, makes the rotation that the backup pad can be stable, improves the stability of backup pad motion.
In summary, the ferrite material provided by the invention has initial permeability of more than 3000 at normal temperature, bulk resistivity of more than 300 Ω M, and excellent impedance characteristics in a frequency range of 1-100M, and the magnetic core made of the ferrite material can effectively reduce electromagnetic wave interference of electronic equipment.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a partial structural diagram of the first embodiment of the present invention.
Fig. 3 is a partial structural schematic diagram of the present invention.
Fig. 4 is a schematic view of a partial structure of the present invention.
Fig. 5 is an enlarged view of a in fig. 4.
Fig. 6 is a partial schematic structural diagram of the present invention.
Fig. 7 is a schematic diagram of a partial structure of the present invention.
Fig. 8 is a partial structural schematic view of the crawler belt of the invention.
Fig. 9 is a partial structural schematic view of the crawler belt of the present invention.
Fig. 10 is a schematic structural view of the support plate of the present invention.
Fig. 11 is a cross-sectional view of a support plate of the present invention.
Fig. 12 is a schematic structural view of the height limiting member of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Example one
A method for preparing a magnetic core by using ferrite materials comprises main materials and auxiliary materials, and the preparation steps comprise:
s1, mixing treatment: weighing main component raw materials Fe2O3, ZnO and Mn according to proportion3O4Mixing in a vibration mill for 60 min;
s2, pre-burning treatment: presintering the mixed material in a rotary kiln for 75min, wherein the temperature in the rotary kiln is 800 ℃, and then cooling;
s2, sanding: adding an additive into the pre-sintered powder, and sanding for 30 minutes; then adding an alcohol solution, and stirring for 75min, wherein the alcohol solution is a PVA solution;
s2, spray granulation;
s2, molding;
s2, sintering treatment: and sintering the formed blank in an atmosphere with the oxygen content of 100ppm, wherein the sintering temperature is 1200 ℃, the sintering heat preservation time is 12 hours, and cooling to room temperature in a nitrogen saturated atmosphere to obtain the ferrite material.
Specifically, the composition of the host material component in step S1 is fe2o342.5mol%, ZnO 25mol%, and the balance Mn3O4(ii) a The auxiliary materials comprise, by total weight, 3000ppm of CoO, 500ppm of CaO, 260 ppm of SiO, 2800 ppm of TiO and 900ppm of CuO;
the additive comprises 600 ppmppmppm of a dispersing agent, 12wt% of a binder and 6ppm of a defoaming agent according to the total weight of the main components.
Example two
A method for preparing a magnetic core by using ferrite materials comprises main materials and auxiliary materials, and the preparation steps comprise:
s1, mixing treatment: weighing main component raw materials Fe2O3, ZnO and Mn according to proportion3O4Mixing in a vibration mill for 80 min;
s2, pre-burning treatment: presintering the mixed material in a rotary kiln for 85min, wherein the temperature in the rotary kiln is 950 ℃, and then cooling;
s2, sanding: adding an additive into the pre-sintered powder, and sanding for 90 minutes; then adding an alcohol solution, and stirring for 95min, wherein the alcohol solution is a PVA solution;
s2, spray granulation;
s2, molding;
s2, sintering treatment: and sintering the formed blank in an atmosphere with oxygen content of 3000ppm, wherein the sintering temperature is 1300 ℃, the sintering heat preservation time is 15 hours, and cooling to room temperature in a nitrogen saturated atmosphere to obtain the ferrite material.
Specifically, the composition of the host material component in step S1 is fe2o345.0mol%, ZnO 26mol%, and the balance is Mn3O4(ii) a The total weight of the auxiliary materials comprises CoO 4500ppm, CaO 900ppm, SiO 2105 ppm, TiO 21500 ppm and CuO 2100 ppm;
the additive comprises 800ppm of dispersant, 15wt% of adhesive and 250ppm of defoaming agent according to the total weight of the main components.
EXAMPLE III
A method for preparing a magnetic core by using ferrite materials comprises main materials and auxiliary materials, and the preparation steps comprise:
s1, mixing treatment: weighing main component raw materials Fe2O3, ZnO and Mn according to proportion3O4Mixing in a vibration mill for 100 min;
s2, pre-burning treatment: presintering the mixed material in a rotary kiln for 95min, wherein the temperature in the rotary kiln is 1150 ℃, and then cooling;
s2, sanding: adding an additive into the pre-sintered powder, and sanding for 150 minutes; then adding an alcohol solution, and stirring for 120min, wherein the alcohol solution is a PVA solution;
s2, spray granulation;
s2, molding;
s2, sintering treatment: and sintering the formed blank in an atmosphere with the oxygen content of 21.00%, wherein the sintering temperature is 1450 ℃, the sintering heat preservation time is 18 hours, and cooling to room temperature in a nitrogen saturated atmosphere to obtain the ferrite material.
Specifically, the composition of the host material component in step S1 is fe2o348.8mol%, ZnO 28mol%, and the balance Mn3O 4; the total weight of the auxiliary materials comprises CoO 7000ppm, CaO 500-1200ppm, SiO 2150 ppm, TiO22400ppm and CuO 3000 ppm;
the additive comprises 1300ppm of dispersant, 18wt% of adhesive and 500ppm of defoaming agent according to the total weight of the main components.
As shown in fig. 1 to 12, the nitrogen combustion kiln described in step S6 in embodiments 1 to 3 includes a kiln body 1, a feeding device and a discharging device, wherein the magnetic core is conveyed into the kiln body 1 by the feeding device for heating, and then is output by the discharging device; specifically, a conveying part 2, a heating part 3, an air supply part 4 and a cooling part 5 are arranged in a kiln body 1, the kiln body 1 is a square kiln body, two heat conduction plates 11 which are obliquely arranged from top to bottom are arranged on the kiln body 1, the heat conduction plates 11 are arranged in an arc shape, the heat conduction plates 11 are provided with two heat conduction plates 11, and the two heat conduction plates 11 are symmetrically arranged; therefore, the heat emitted from the heating component 3 can contact with the heat conducting plate 11 and then reversely rebounds to form circulating heat, and the mode can ensure that a plurality of magnetic cores positioned at the lower part are heated when the magnetic cores are heated; the heating part 3 is a resistance wire arranged in the kiln body 1 and generates heat through electric conduction; the gas supply part 4 comprises a nitrogen pipeline 41 and an oxygen pipeline 42, wherein the nitrogen pipeline 41 is used for supplying nitrogen so that the interior of the kiln body 1 is in a nitrogen atmosphere state; the oxygen pipeline 42 is used for conveying oxygen; the end part of the nitrogen pipeline 41 is bent upwards, so that the nitrogen pipeline 41 is arranged upwards, and the oxygen pipeline 42 is also arranged upwards, therefore, when the nitrogen pipeline 41 and the oxygen pipeline 42 input gas into the kiln body 1, the gas impacts the top of the kiln body 1 and the heat conducting plate 11, and then both the nitrogen and the oxygen can circularly flow; this setting mode avoids local oxygen and nitrogen gas's concentration too high and when causing to heat the magnetic core, causes the ferrite material reaction that constitutes the magnetic core incomplete, and it can improve the effect of magnetic core after the heating.
Further, the conveying component 2 comprises a support 21, a crawler 22, a driving structure 23 and a track 24 which are arranged in the kiln body 1, the support 21 is a metal frame, and the support 21 is arranged in the kiln body 1; the driving structure 23 is composed of a driving roller 231, a driven roller 232 and a motor, the driving roller 231 is arranged on the bracket 21, the driving roller 231 rotates under the driving of the motor, a plurality of biting teeth 234 are arranged at two ends of the driving roller 231, the biting teeth 234 are metal teeth, and the biting teeth 234 are protruded on the surface of the driving roller 231; the teeth 234 engage the track 22 to rotate the track 22; the driven roller 232 is arranged at the other end of the bracket 21, and two ends of the driven roller 232 are movably connected with the bracket 21.
Specifically, the caterpillar track 22 is a metal caterpillar track sleeved on the driving roller 231 and the driven roller 232; the crawler 22 comprises a plurality of first crossbars 221 and a plurality of second crossbars 222, wherein the first crossbars 221 are metal square bars, and the second crossbars 222 are also metal square bars; a first protrusion 291 is formed on one side of the first rail 221, a first recess 292 having the same depth as that of the first protrusion 291 is formed on the other side of the first rail 221, a second protrusion 293 having the same depth as that of the first protrusion 291 is formed on one side of the second rail 222, and a second recess 294 having the same depth as that of the first protrusion 291 is formed on the other side of the second rail 222, so that the first protrusion 291 is inserted into the second recess 294 and the same second protrusion 293 is inserted into the first recess 291 when the crawler 22 rotates, whereby the crawler 22 can be formed in a flat plate shape.
Specifically, the ends of the first crossbar 221 and the second crossbar 222 are movably connected through a hinge; a first notch 229 is arranged on two sides of the first cross bar 221, a second notch 228 is arranged on two sides of the second cross bar 222, the first notch 229 and the second notch 22 form a groove, and the biting teeth 234 are inserted between the first notch 229 and the second notch 228; thereby causing the track 22 to rotate, which is effective to improve the stability of the movement of the track 22, and which also avoids welding projections on the track 22, which reduces the weight of the track 22.
Further, the ends of the first crossbar 221 and the second crossbar 222 are movably connected through a hinge, a circular recessed rotating track 223 is disposed on the track 22, the circular recessed rotating track 223 is a circular recessed track, the circular recessed rotating track 223 is formed by downward recessing the upper end surface of the track, a plurality of first balls 224 are disposed in the circular recessed track 223, the first balls 224 are metal steel balls, and the first balls 224 are disposed on the first crossbar or the second crossbar; a second ball 225 is arranged in the middle of the circular shape encircled by the rotating concave track 223, the second ball 225 is a metal ball, and the diameter of the second ball 225 is larger than that of the first ball 224; the second ball 225 is raised above the upper end surface of the track 22.
A track 28 is arranged on the bracket, the track 28 is a metal beam, a track with a downward concave middle is arranged on the track 28, third balls 281 are arranged on the first cross bar and the second cross bar, and the third balls 281 are positioned in the track 28; the track 28 is configured to support the track 22 and to maintain the track 22 in position while supporting the core, and the third ball 281 is positioned within the track 28.
Specifically, the conveying component 2 further comprises a supporting plate 27 for supporting a magnetic core, the supporting plate 27 is a metal plate, and the magnetic core is directly placed on the supporting plate 27; a tooth block 271 is connected to the supporting plate 27, the tooth block 271 is a circular disc-shaped metal block, and metal teeth are arranged on the side wall of the tooth block 271; the tooth block 271 is provided with a concave part 272, the concave part 272 is provided with a conical shape, the tooth block 271 is provided with an anti-slip concave part 273 communicated with the concave part 272, the anti-slip concave part 273 is an approximately hemispherical concave part, and the anti-slip concave part 273 is positioned at the top end of the anti-slip concave part 273; when the support plate 27 is placed on the crawler 22, the second ball 225 contacts the inner wall of the recess 272, so that the inner wall of the recess 272 contacts the second ball 225 by the vibration of the crawler 22 and the gravity of the core, and then the entire support plate 27 is moved, and the anti-slip recess 273 is fitted over the second ball 225, so that the support plate 27 is rotated.
Further, two racks 211 are arranged on the bracket 21, and the racks 211 are metal strips with teeth; after the anti-slip concave part 233 is sleeved on the second ball 225, when the support plate 27 moves along with the track 22, the support plate 27 contacts with the rack 211, so that the support plate 27 rotates; the bracket 21 is provided with a pushing component 24, the pushing component 24 comprises a push rod 241 and a push plate 242, the push rod 241 is a metal rod, the push rod 241 moves through an air cylinder, and the push rod 241 is arranged obliquely; the push plate 242 is a metal plate, and the push plate 242 is connected to the push rod 241, so that the push rod 241 can push the support plate 27 out of the kiln body 1 through the push plate 242.
Specifically, the cooling member 5 includes a circulation pipe 51 and a water inlet pipe 52 which are arranged at one end of the kiln body 1, the circulation pipe 51 is located at the upper part of the kiln body 1, the circulation pipe 51 is connected with a water outlet pipe 53 and the water inlet pipe 52, the water inlet pipe 52 is pumped into the circulation pipe 51 by a water pump to flow, and then is discharged out of the kiln body 1 through the water outlet pipe 53, the kiln body 1 is externally provided with a heat dissipation groove 54, the heat dissipation groove 54 is arranged on the side wall of the kiln body 1, water on the water outlet pipe 53 enters the heat dissipation groove 54 to be subjected to heat dissipation treatment, then is concentrated into a clean water tank, and then flows again after being pumped; the temperature of one end of the kiln body 1 can be effectively reduced through the arrangement mode, and then the heat on the magnetic core is also absorbed.
Specifically, the feeding device comprises a frame body 61, a conveying part, a height limiting part and a pushing part, wherein the frame body 61 is a metal frame, the conveying part is arranged on the frame body 61, the conveying part comprises a first roller body, a second roller body, a motor 613 and a conveying belt 614, the first roller body and the second roller body are both arranged on the frame body 61, then the motor 613 is connected with the first roller body through a shaft to drive the first roller body to rotate, and the conveying belt 614 is sleeved on the first roller body and the second roller body, so that when the supporting plate 27 provided with the magnetic core is arranged on the supporting plate, the conveying belt 614 conveys the supporting plate 27 to one end of the kiln body 1; the height limiting component comprises a supporting rod 621 and a height limiting rod 622, the supporting rod 621 is a metal rod, the end of the height limiting rod 622 is connected with a spring 623, the lower end of the spring 623 is connected with the height limiting rod 622, the upper end of the spring 623 is connected with a connecting rod 624, the connecting rod 624 is inserted into the supporting rod 621, a locking bolt 625 is arranged on the supporting rod 621, and the connecting rod 624 is fixed through the locking bolt 625.
Further, a plurality of limit blocks 63 are arranged on the frame body 61, an elastic member 631 is arranged on the limit blocks 63, the elastic member 631 is a metal spring, one end of the elastic member 631 is connected with the limit blocks 63, and the other end is connected with the frame body 61; therefore, when the conveyor belt is conveyed to the frame body 61, the limit block 63 can limit the support plate 27; the pushing component comprises a pushing cylinder 641 and a pushing block 642, and the pushing cylinder 642 can push the pushing block to move, so that the supporting plate 27 is pushed by the pushing block to move forwards, and the supporting plate 27 falls on the crawler 22; it should also be noted that the height of the support is 3-6 cm above the tracks.
Further, the discharging device comprises a metal frame and a conveying belt, and the height of the conveying belt is 3-6 cm lower than the upper end face of the track.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (1)
1. A method for preparing a magnetic core by using ferrite materials comprises main materials and auxiliary materials, and is characterized in that: the preparation method comprises the following steps:
s1, mixing treatment: weighing main component raw materials Fe2O3, ZnO, Mn3O4 and auxiliary materials in proportion, and mixing in a vibration mill for 60-100 min;
s2, pre-burning treatment: presintering the mixed material in a rotary kiln for 75-95min, wherein the temperature in the rotary kiln is 800-1150 ℃, and then cooling;
s3, sanding: adding an additive into the pre-sintered powder, and sanding for 30-150 minutes; then adding alcohol solution and stirring for 75-120 min;
s4, spray granulation;
s5, molding;
s6, sintering by adopting a nitrogen combustion kiln: sintering the formed blank in an atmosphere with the oxygen content of 100ppm-21.00%, wherein the sintering temperature is 1200-1450 ℃, the sintering heat preservation time is 12-18 hours, and cooling to the room temperature in a nitrogen saturated atmosphere to obtain a ferrite material;
the composition of the main material component in the step S1 is Fe2O342.5-48.8 mol%, ZnO 25-28mol% and the balance of Mn3O 4;
the total weight of the auxiliary materials comprises CoO 3000-7000ppm, CaO 500-1200ppm, SiO260-150ppm, TiO 2800-2400 ppm and CuO 900-3000 ppm;
the additive comprises 600ppm to 1300ppm of dispersant, 12wt% to 18wt% of adhesive and 6ppm to 500ppm of defoaming agent according to the total weight of the main components;
the alcoholic solution is a PVA solution;
the nitrogen combustion kiln comprises a kiln body (1), a feeding device and a discharging device, wherein the feeding device and the discharging device are used for pushing a magnetic core to enter the kiln body, a conveying component (2) used for conveying the magnetic core from one end of the kiln body (1) to the other end of the kiln body, a plurality of heating components (3) arranged in the kiln body (1), a gas supply component (4) used for inputting gas into the kiln body (1) and a cooling component (5) used for reducing the temperature of one end of the kiln body (1) to cool the magnetic core are arranged in the kiln body (1), and the cooling component (5) is arranged at one end of the kiln body (1);
the kiln body (1) is provided with two heat-conducting plates (11) which are obliquely arranged from top to bottom, the heat-conducting plates (11) are arranged in an arc shape, the heat-conducting plates (11) are provided with two heat-conducting plates, and the two heat-conducting plates (11) are symmetrically arranged;
the conveying component (2) comprises a support (21) arranged in the kiln body (1), a crawler (22) arranged on the support (21), a driving structure (23) used for driving the crawler (22) to rotate and a track (28) supporting the crawler (22), and the track (28) is arranged on the support (21);
the crawler (22) comprises a plurality of first cross bars (221) and a plurality of second cross bars (222) arranged at intervals with the first cross bars (221), and the first cross bars (221) are movably connected with the second cross bars (222);
the first cross bar (221) is a metal square bar, and the second cross bar (222) is also a metal square bar; a first protrusion (291) is arranged on one side of the first cross bar (221), a first recess (292) with the depth identical to that of the first protrusion (291) is arranged on the other side of the first cross bar, a second protrusion (293) with the depth identical to that of the first protrusion (291) is arranged on one side of the second cross bar (222), and a second recess (294) with the depth identical to that of the first protrusion (291) is arranged on the other side of the second cross bar (222); the first projection (291) can be inserted into the second recess (294) and a second, identical projection (293) can be inserted into the first recess (291);
the conveying component (2) further comprises a supporting plate (27) for placing a magnetic core, a disc-shaped tooth block (271) is arranged on the supporting plate (27), and a rack (211) matched with the tooth block (271) is arranged on the support (21);
an annular rotary concave track (223) is formed by downwards sinking the upper end surface of the crawler (22), a plurality of first balls (224) are arranged in the concave track (223), second balls (225) with the diameter larger than that of the first balls (224) are arranged on the crawler (22), and a sinking part (272) matched with the second balls (225) is arranged in the middle of the toothed block (271); the second ball (225) is arranged in the middle of a circle encircled by the rotary concave rail (223); the recess (272) is conically arranged; the tooth block (271) is provided with an anti-slip concave part (273) communicated with the concave part (272), the anti-slip concave part (273) is a concave part similar to a hemisphere, and the anti-slip concave part (273) is positioned at the top end of the anti-slip concave part (273);
and third balls (281) are arranged on the first cross rod and the second cross rod, and the third balls (281) are positioned in the track (28).
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| CN110867319B (en) * | 2019-09-22 | 2020-10-16 | 浙江春晖磁电科技有限公司 | Method for preparing magnetic core from energy-saving and environment-friendly ferrite material |
| CN113503736B (en) * | 2021-07-01 | 2022-03-25 | 南京溧水金洪磁性元件有限公司 | Production method and device of permanent magnetic ferrite for low-noise permanent magnet motor |
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