CN115351284B - Be applied to multistage processing unit of sendust powder of metal magnetic powder core - Google Patents
Be applied to multistage processing unit of sendust powder of metal magnetic powder core Download PDFInfo
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- CN115351284B CN115351284B CN202211283428.2A CN202211283428A CN115351284B CN 115351284 B CN115351284 B CN 115351284B CN 202211283428 A CN202211283428 A CN 202211283428A CN 115351284 B CN115351284 B CN 115351284B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0888—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting construction of the melt process, apparatus, intermediate reservoir, e.g. tundish, devices for temperature control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0896—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid particle transport, separation: process and apparatus
Abstract
The invention discloses a multistage processing device of iron-silicon-aluminum powder applied to a metal magnetic powder core, which comprises a powder gas atomization preparation component, a rolling and crushing component, a sorting component, a shaping component and a bag-type dust collector which are sequentially communicated; the powder gas atomization preparation assembly comprises a tundish, a multi-pass guide pipe, a plurality of atomization nozzles and an atomization cylinder which are hermetically communicated from top to bottom, and the grinding and crushing assembly comprises a first conveyor belt, a lower pressing plate arranged on the first conveyor belt and an upper pressing plate matched with the lower pressing plate; the sorting component comprises a screening cylinder, the bottom of the screening cylinder is communicated with the rolling and crushing component, and the top of the screening cylinder is communicated with the shaping component; the shaping component comprises a shaping barrel, a plurality of groups of second nitrogen nozzles in the circumferential tangential direction of the inner wall of the shaping barrel are arranged in the middle of the shaping barrel, and the top of the shaping barrel is communicated with the screening barrel and the bag-type dust collector respectively. Aims to improve the production efficiency of-200 ferrum-silicon-aluminum powder and further improve the utilization rate of the ferrum-silicon-aluminum powder with the particle size of +200 meshes.
Description
Technical Field
The invention relates to the technical field of magnetic materials, in particular to a multistage processing device for Fe-Si-Al powder applied to a metal magnetic powder core.
Background
At present, magnetic components prepared from magnetic materials are an important basis of electronic information industry, and are widely applied to the industrial fields of computers, sensors, electric power, communication, aerospace, automobiles, energy sources and the like and daily life electric appliances, and particularly occupy a particularly important position in the electronic information industry.
Furthermore, there are two methods for producing soft magnetic sendust powder (silicon 9.6%, aluminum 5.4%, and iron balance) in the industry at present, one method is a crushing method for sendust, namely smelting and ingot casting and then mechanically grinding and crushing; and the other method is to obtain sendust powder by smelting nitrogen gas and atomizing. Qualified products obtained by the two methods are 200 meshes (abbreviated as 200 meshes), and the micro appearance of the crushed Fe-Si-Al powder is irregular, the micro appearance of the atomized Fe-Si-Al powder is spherical, and the magnetic performance of the atomized Fe-Si-Al powder is better than that of the crushed Fe-Si-Al powder. The sendust prepared by the gas atomization method is mainly applied to a metal magnetic powder core, and the direct current superposition characteristic of the magnetoelectric property of the metal magnetic powder core is mainly related to the powder micro-morphology (the sphericity and the proportion of satellite balls). The better the powder sphericity, the fewer the satellite spheres, the better the dc superposition characteristics.
At present, the industry adopts two methods for recycling the unqualified iron-silicon-aluminum powder of +200 meshes: the first remelting process generally adopts non-vacuum melting, and because aluminum is easy to absorb oxygen to form oxide slag during high-temperature melting, a large amount of oxide slag can be generated and can block a tundish, so that atomization production cannot be continuous. Secondly, a mechanical crushing method is adopted, but the spherical particles of the plus 200-mesh Fe-Si-Al powder have high ductility, are not easy to crush unlike Fe-Si-Al ingots, have very poor crushing effect by using a common mechanical crushing method, and have very poor magnetic property and cannot be used. For example, the spherical grinding ball is used for grinding spherical coarse Fe-Si-Al particles in the existing ball-milling method, the effect is poor; the jet mill mainly crushes by the collision of materials, has high ductility and high elasticity, and the iron-silicon-aluminum particles can be bounced off each other once colliding, so the crushing effect is poor. In conclusion, the effect of the re-melting and the conventional mechanical crushing method is poor, and the + 200-mesh aluminum-silicon powder cannot be recycled in the industry, so that the raw material accumulation is wasted. Based on this, the processing and obtaining of the sendust powder of 200 mesh with high yield becomes the key of the research in this field.
Disclosure of Invention
The invention mainly aims to provide a multistage processing device of sendust powder applied to a metal magnetic powder core, aiming at solving the technical problem of improving the production efficiency of the-200-mesh sendust powder and improving the utilization rate of the + 200-mesh sendust powder.
In order to achieve the aim, the invention provides a multistage processing device of sendust applied to a metal magnetic powder core, which comprises a powder gas atomization preparation component, a rolling crushing component, a sorting component, a shaping component and a dust collector which are sequentially communicated;
the powder gas atomization preparation assembly comprises a tundish, a multi-way flow guide pipe, a plurality of atomization nozzles and an atomization cylinder, wherein the tundish, the multi-way flow guide pipe, the plurality of atomization nozzles and the atomization cylinder are hermetically communicated from top to bottom;
the grinding and crushing assembly comprises a first conveyor belt, a lower pressing plate arranged on the first conveyor belt and an upper pressing plate matched with the lower pressing plate, a pressure assembly is further arranged on the upper pressing plate, one end of the first conveyor belt is connected with a feeding pipeline, the other end of the first conveyor belt is communicated with the sorting assembly, and the feeding pipeline is communicated with the atomizing cylinder;
the sorting component comprises a screening cylinder, a plurality of first nitrogen nozzles are uniformly arranged at the bottom of the screening cylinder along the circumferential radial direction, the bottom of the screening cylinder is communicated with the rolling and crushing component, and the top of the screening cylinder is communicated with the shaping component;
the shaping component comprises a shaping barrel, a plurality of groups of second nitrogen nozzles in the circumferential tangential direction of the inner wall of the shaping barrel are arranged in the middle of the shaping barrel, and the top of the shaping barrel is communicated with the screening barrel and the dust collector respectively.
Optionally, the multi-pass flow guide pipe comprises an upper flow guide pipe and a plurality of lower flow guide branch pipes communicated with the upper flow guide pipe, each lower flow guide branch pipe is matched with a corresponding atomizing nozzle, and each atomizing nozzle is connected with a corresponding first nitrogen storage tank.
Optionally, each air exhaust assembly is a vacuum air exhaust pump, and each vacuum air exhaust pump controls the internal pressure of the air classification pipeline at the upper end to be greater than the pressure of the air classification pipeline at the lower end.
Optionally, atomizing bobbin base portion and first transition feed bin intercommunication, atomizing bobbin base portion still are equipped with the liquid nitrogen delivery port and connect the intercommunication mouth of relief valve, first transition feed bin passes through screening machine and charge-in pipeline intercommunication, the screening machine still is connected with first receipts feed bin.
Optionally, a plurality of connecting pipes are symmetrically distributed on each stage of airflow classifying pipe along the circumference of the atomizing cylinder, each pipe is connected with a corresponding powder collecting structure, and the powder collecting structure at the bottommost layer is communicated with the first transition bin.
Optionally, a double-roller crusher is further arranged between the first conveying belt and the sorting assembly, a plurality of groups of zigzag rolling shafts are arranged in the double-roller crusher, a second conveying belt is arranged below the double-roller crusher, one end of the second conveying belt is communicated with the inner cavity of the screening drum, and the bottom of the screening drum is communicated with the double-roller crusher.
Optionally, the first nitrogen nozzles are symmetrically arranged in a ring shape and are connected with the second nitrogen storage tank; and all the second nitrogen nozzles in the same group are annularly distributed and are connected with a fourth nitrogen storage tank.
Optionally, a spraying structure is distributed at the bottom of the shaping cylinder; the spraying structure is composed of a plurality of third nitrogen nozzles distributed along the circumferential radial direction, and the third nitrogen nozzles are symmetrically distributed in an annular shape, or the spraying structure is in an annular structure, and one side of the spraying structure, which is close to the inner cavity of the shaping cylinder, is provided with an annular seam with a preset width; the injection structure is also connected with a fifth nitrogen storage tank.
Optionally, the top of the shaping cylinder is communicated with a cyclone separator, the bottom of the cyclone separator is connected with a third material receiving bin, the top of the cyclone separator is also communicated with a dust collector, and the dust collector is provided with a nitrogen gas discharge port.
Optionally, the tundish is further connected with an intermediate frequency furnace, and the intermediate frequency furnace is used for smelting pure iron, aluminum ingots and metal silicon in a preset mass ratio.
Has the advantages that:
1. the improved multi-pass guide pipe is arranged on the powder gas atomization preparation component, so that the production efficiency of the sendust powder is improved, the classified collection of the sendust powder with different sizes is realized by combining the powder gas atomization preparation component with the air flow classification, the bonding of the powder with different sizes is avoided, the yield of the powder of 200 meshes is finally improved, and the performance of the metal magnetic powder core is improved;
2. the combined arrangement of the rolling crushing assembly, the sorting assembly and the shaping assembly realizes the processing of the sendust powder of +200 meshes, so that the recycling of products of +200 meshes is improved, and the utilization rate of unqualified sendust powder for the metal magnetic powder core is improved;
3. the arrangement of the rolling crushing assembly effectively improves the crushing efficiency of the powder;
4. the arrangement of the plurality of first nitrogen nozzles in the sorting assembly realizes further classification of the crushed powder, and the sorting assembly is communicated with the rolling crushing assembly, so that secondary crushing processing of partial powder is realized;
5. the arrangement of a plurality of second nitrogen gas nozzles in the shaping assembly can further break particles and change irregular particles into spherical or spheroidal particles, so that the shaping of powder is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a sectional view of an embodiment of a multistage processing apparatus for sendust powder applied to a metal magnetic powder core according to the present invention;
FIG. 2 is a schematic view of a powder aerosolization preparation assembly of the structure shown in FIG. 1;
FIG. 3 is a schematic view of the crushing assembly of the configuration of FIG. 1;
fig. 4 is a schematic diagram of the sorting assembly, the shaping assembly and the dust collector shown in fig. 1.
The reference numbers illustrate:
the implementation, functional features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that all the directional indicators (such as upper and lower 8230; etc.) in the embodiments of the present invention are only used for explaining the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Referring to fig. 1 to 4, the invention provides a schematic structural diagram of a multistage processing device for sendust applied to a metal magnetic powder core, wherein the multistage processing device comprises a powder gas atomization preparation component, a rolling crushing component, a sorting component, a shaping component and a dust collector 37 which are sequentially communicated.
Further, as shown in fig. 2, the powder gas atomization preparation assembly includes a tundish 3, a multi-pass flow guide pipe 4, a plurality of atomizing nozzles 2 and an atomizing cylinder 5, which are hermetically communicated from top to bottom, generally, before processing, pure iron, aluminum ingots and metal silicon in a preset mass ratio are melted in an intermediate frequency furnace 1, the heating temperature is set to 1600-1700 ℃ more, and molten iron-silicon-aluminum alloy is poured into the tundish 3 for atomization, the lower end of the tundish 3 is communicated with the multi-pass flow guide pipe 4, wherein the multi-pass flow guide pipe 4 includes an upper flow guide pipe and a plurality of lower flow guide branch pipes communicated with the upper flow guide pipe, each lower flow guide branch pipe is matched with a corresponding atomizing nozzle 2, the provided atomizing nozzle 2 is a laval nozzle, and each atomizing nozzle 2 atomizes the molten iron coming out from two sides of the corresponding lower flow guide branch pipe, and each atomizing nozzle 2 is connected to a corresponding first nitrogen storage tank 13, and nitrogen is used as an atomizing medium. The improvement is based on the fact that the tolerance temperature of a single guide pipe conduit is limited by time limit, the prior improvement in the industry is that the aperture is enlarged to reduce the high-temperature-resistant time, but the yield of the powder of the qualified product of the-200 meshes is greatly reduced under the condition that the atomization pressure is unchanged, although the yield of the powder of the qualified product of the-200 meshes can be improved by further improving the atomization pressure, the limit value of the atomization pressure is about 5MPa, the atomization pressure is further improved, and the yield of the fine powder is almost unchanged. Furthermore, the improvement effect of the multi-way flow guide pipe 4 in the scheme has obvious progress, and the yield of powder of 200 meshes can be improved.
Further, atomizing cylinder 5 includes the multistage air classification pipeline with 5 inner chambers of atomizing cylinder intercommunication, and air classification pipeline axial distribution at the different positions of 5 lateral walls of atomizing cylinder at all levels, and air classification pipeline at all levels is connecting the subassembly and the powder collection structure of bleeding that correspond, and then atomizing cylinder 5 is used for the powder to receive the effect of nitrogen pressure difference at the in-process of flying downwards, and the atomizing powder granule gets into the powder from air classification pipeline at all levels respectively and collects in the structure. The airflow pipeline units in the same stage of airflow grading pipeline are annularly distributed around the atomizing cylinder 5 and are vertical to the side wall of the atomizing cylinder 5, and each airflow pipeline unit is connected with a corresponding powder collecting structure; preferably, a plurality of gas flow duct units in the same stage of the gas flow classification duct are connected to the same extraction assembly.
Furthermore, each air exhaust component is a vacuum air exhaust pump, and each vacuum air exhaust pump controls the internal pressure of the air classification pipeline positioned at the upper end to be greater than the pressure of the air classification pipeline positioned at the lower end, so that the size of the powder collected by the powder collecting structure connected with the air classification pipeline positioned at the upper end is smaller than that of the powder collected by the powder collecting structure connected with the air classification pipeline positioned at the lower end, and the powder particles with different sizes are conveniently classified for standby. Meanwhile, the problem of powder bonding is effectively avoided by classifying and storing the powder with different sizes, because the atomized particles are often agglomerated and adhered to form satellite balls, the flowability of the powder is reduced, and the magnetoelectric property of the metal magnetic powder core is influenced. The reason for the occurrence of "satellite balls" is that the small particles tend to stick to the surface of the large particles during the flight of the powder due to the inconsistent cooling rate of the large and small particles.
Further, as shown in fig. 2, in the present embodiment, three stages of air classification pipelines are provided, and in practical application, the pressures of the air classification pipelines from the upper end to the lower end may be respectively set as follows: 2KPa, 0.8KPa and 0.2KPa, and connects the corresponding first powder collection structure 6, second powder collection structure 7 and third powder collection structure 8 to collect the atomized powder with fine, medium and coarse particles, respectively, wherein the first powder collection structure 6 is symmetrically distributed along the atomization cylinder 5 by 2, or 3, and the collected powder can be directly discharged from a valve under the structure 6; similarly, the second powder collecting structure 7 and the third powder collecting structure 8 are arranged in the same way as the first powder collecting structure 6; the large-particle powder which is not collected by the powder collecting structure enters the bottom of the atomizing cylinder 5, a liquid nitrogen cooling layer is arranged at the bottom of the atomizing cylinder 5, so that the large particles are cooled rapidly, a nitrogen interlayer is further arranged at the bottom of the atomizing cylinder 5 and comprises a liquid nitrogen conveying port 9 and an output port used for being connected with the pressure release valve 10, a corresponding start-stop module is arranged inside the pressure release valve 10, and then if the fact that liquid nitrogen inside the nitrogen interlayer is vaporized reaches a certain pressure in the process that the pressure release valve 10 is communicated with the nitrogen interlayer is detected, the pressure release valve 10 is started and controls nitrogen inside the nitrogen interlayer to be discharged from the pressure release valve 10; and the large granular powder at the bottom of the atomizing cylinder 5 is conveyed to the first transition bin 11 at the lower end for subsequent crushing treatment. Preferably, the powder collected by the plurality of third powder collecting structures 8 can also be transferred into the first transition bin 11, so as to realize further crushing treatment of the large-particle powder; meanwhile, the powder collected by the first powder collecting structure 6 and the second powder collecting structure 7 can be directly used as one of the raw material sources for the subsequent preparation of the metal magnetic powder core. In practical applications, the powder collected by the first powder collecting structure 6 and the second powder collecting structure 7 is-200 mesh powder, and the powder collected in the first transition bin 11 is mostly +200 mesh powder.
Further, as shown in fig. 3, the crushing assembly includes a first conveyor belt 19, a lower pressing plate 20 disposed on the first conveyor belt 19, and an upper pressing plate 18 disposed in a matching manner with the lower pressing plate 20, the upper pressing plate 18 is further provided with a pressure assembly, one end of the first conveyor belt 19 is connected to the feeding pipe 16, the other end of the first conveyor belt is communicated with the sorting assembly, and the feeding pipe 16 is communicated with the atomizing barrel 5.
Specifically, the powder particles in the first transition bin 11 are conveyed to a pressing area between an upper pressing plate 18 and a lower pressing plate 20 through a feeding pipeline 16 and a first conveying belt 19, the upper pressing plate 18 is connected with a piston rod 17, the piston rod 17 is connected with a corresponding pressure assembly, the pressure assembly drives the upper pressing plate 18 to press the powder downwards through the piston rod 17, the lower pressing plate 20 runs in a reciprocating mode under the action of the first conveying belt 19, the powder particles are changed from three-dimensional spheres into flat powder particles with a two-dimensional plane structure, the pressed flat powder particles are conveyed to a second transition bin 21 communicated with the first conveying belt 19, and the flat powder particles are conveyed to a roller crusher 23 under the action of a second power pump 22.
Preferably, before the powder particles in the first transition bin 11 enter the compression area between the upper pressing plate 18 and the lower pressing plate 20, the powder particles are further sieved by the sieving machine 14, part of the powder particles which do not need to be pressed are directly collected by the first collecting bin 15, and the rest of the powder particles are conveyed to the compression area between the upper pressing plate 18 and the lower pressing plate 20 through the feeding pipe 16 and the first conveyor belt 19. In practical application, the powder particles in the first transition bin 11 are conveyed to the sieving machine 14 through the first power pump 12, wherein the sieving machine 14 collects the powder with the particle size of 200 meshes or less into the first receiving bin 15, and the sendust powder with the particle size of 200 meshes or more is conveyed to the conveying belt 19 from the feeding pipeline 16 so as to further process the sendust powder with the particle size of 200 meshes.
Furthermore, a plurality of sets of roller shafts 24 in a zigzag shape are arranged in the double-roller crusher 23, generally, each set of roller shafts 24 are distributed up and down, and a discharge port of the upper roller shaft 24 is positioned right above a feed port of the lower roller shaft 24, so that multiple crushing operations are realized; the double-roller crusher 23 is used for crushing the flat materials conveyed in the second transition bin 21 into small particles with irregular shapes, and a second conveyor belt 25 is arranged below the double-roller crusher 23, so that the crushed small particles enter a subsequent sorting assembly through the second conveyor belt 25.
Further, as shown in fig. 4, the sorting assembly includes a sieving cylinder 26, in practical use, one end of the second conveyor belt 25 is communicated with an inner cavity of the sieving cylinder 26, a plurality of first nitrogen nozzles 27 are uniformly arranged at the bottom of the sieving cylinder 26 along a circumferential radial direction, wherein the plurality of first nitrogen nozzles 27 are annular and radially distributed along a cross section of the sieving cylinder 26, each first nitrogen nozzle 27 is connected with the second nitrogen storage tank 28, and the plurality of first nitrogen nozzles 27 are annularly and radially arranged to prevent powder entering the sieving cylinder 26 from falling down, preferably, the number of the first nitrogen nozzles 27 is set to be 3 and annularly and symmetrically distributed, so that the sprayed nitrogen flows converge at a point where a circumferential surface and an axial line of the sieving cylinder 26, and then flow upwards, so that lighter particles enter the sieving cylinder 26 and float in the inner cavity of the sieving cylinder 26 and are conveyed to a subsequent processing device under the driving of the nitrogen flows, and heavier particles sink to the bottom of the sieving cylinder 26 and are further treated by the subsequent crushing nozzle 27, so that the sieving cylinder 26 has a nitrogen effect.
Specifically, the bottom of the screening barrel 26 can be communicated with the double-roll crusher 23, and the heavy large particles are easy to drop at the bottom of the screening barrel 26 due to the fact that the self gravity of the heavy large particles is larger than the buoyancy of nitrogen, so that the heavy large particles are conveyed by a pipeline to return to the double-roll crusher 23 for secondary crushing, and the powder utilization rate is effectively improved. For lighter powder particles, the powder particles can be transported from the top of the sifting cylinder 26 to the shaping assembly under the action of nitrogen. Wherein, for setting up corresponding power component in the pipeline that a branch section of thick bamboo 26 and double-roll crusher 23 communicate, in this embodiment, connect corresponding third nitrogen gas holding vessel 29 in the one side that is close to a branch section of thick bamboo 26 to in the double-roll crusher 23 is flowed back under the nitrogen gas effect for the powder that drops in the branch section of thick bamboo 26 bottom. The pressure values of the outputs of the second nitrogen storage tank 28 and the third nitrogen storage tank 29 are set differently, and can be adjusted according to practical application. In addition, a corresponding power pump may be provided in place of the third nitrogen storage tank 29.
Further, the shaping assembly comprises a shaping barrel 31, a plurality of groups of second nitrogen nozzles 30 are arranged in the middle of the shaping barrel 31 along the circumferential tangential direction of the inner wall of the shaping barrel 31, and the top of the shaping barrel 31 is respectively communicated with the screening barrel 26 and the dust collector 37. Specifically, the second nitrogen nozzles 30 in the same group are annularly arranged, and each second nitrogen nozzle 30 is connected to a fourth nitrogen storage tank 33; preferably, the shaping cylinder 31 comprises two groups of second nitrogen nozzles 30 along the circumferential tangential direction of the inner wall of the shaping cylinder 31, and 2 second nitrogen nozzles 30 are respectively and symmetrically distributed at 1/3 and 1/2 of the top end of the shaping cylinder 31 along the circumferential tangential direction of the inner wall of the shaping cylinder 31, so that nitrogen is sprayed out along the tangential direction of the inner circumferential surface of the cylinder wall and rotates along the inner circumferential surface of the cylinder body, fine particles mutually rotate and collide under the action of nitrogen, particles can be further crushed, irregular particles can be changed into spherical or spheroidal particles, and the purpose of shaping is achieved.
Furthermore, the bottom of the shaping cylinder 31 is provided with a spraying structure 32, the spraying structure 32 may be composed of a plurality of third nitrogen nozzles uniformly distributed along the circumferential radial direction, each third nitrogen nozzle is symmetrically distributed in a ring shape and is distributed on the corresponding cross section of the shaping cylinder 31, each third nitrogen nozzle is further connected with a fifth nitrogen storage tank 34, and the arrangement of the third nitrogen nozzles at the bottom can prevent the powder from falling down. Thereby achieving a certain sorting effect.
In addition, the injection structure 32 may also be an annular structure, and one side of the injection structure 32 close to the inner cavity of the shaping cylinder 31 has a circular seam with a preset width, and the injection structure 32 is connected with the fifth nitrogen storage tank 34, so that nitrogen is injected through the circular seam of the injection structure 32, and powder in the shaping cylinder 31 can also be prevented from falling.
Further, the top of the shaping cylinder 31 is communicated with a cyclone separator 35, the bottom of the cyclone separator 35 is connected with a third material receiving bin 36, the top of the cyclone separator 35 is further communicated with a dust collector 37, and a nitrogen gas discharge port communicated with external atmosphere is further arranged at the upper end of the dust collector 37, so that the nitrogen gas in the device can be conveniently discharged. Specifically, the shaped spherical or spheroidal particles enter the cyclone separator 35 through the top of the shaping barrel 31, heavier powder particles enter the third collecting bin 36 for collection, and lighter ultrafine powder particles are collected by the dust collector 37. Preferably, the dust collector 37 in this embodiment is a bag-type dust collector.
The arrangement of the components realizes multi-stage processing treatment on the iron-silicon-aluminum powder, effectively improves the utilization rate of powder with different sizes, wherein the output pressure of a plurality of nitrogen storage tanks arranged inside the components is different and can be adjusted according to actual requirements, and the powder of each collecting structure and each collecting bin can be used for preparing the metal magnetic powder core, specifically, the powder of the first powder collecting structure 6, the second powder collecting structure 7 and the first collecting bin 15 can be directly adopted and mixed to obtain powder A, the powder A and the powder B of the third collecting bin 36 are mixed according to a certain proportion (A: 100-70% and B: 0-30%), then are subjected to insulation coating treatment by additives such as phosphoric acid, organic silicon resin and zinc stearate, and then the metal magnetic powder core C is obtained through compression molding, preheating, sintering, impregnation, chamfering and coating processes to test the magnetoelectric performance. The specific examples are as follows:
example 1
The method comprises the steps of mixing-200-mesh Fe-Si-Al powder A1 and powder B1 obtained by crushing and shaping + 200-mesh Fe-Si-Al unqualified products according to a certain mass ratio (A1: 100% and B1: 0%), carrying out insulating coating treatment by additives such as phosphoric acid, organic silicon resin and zinc stearate, carrying out press forming, preheating, sintering, impregnation, chamfering and coating to obtain a metal magnetic powder core C1, and testing the magnetoelectric performance of the magnetic powder core.
Example 2
The method comprises the steps of mixing-200-mesh Fe-Si-Al powder A2 and powder B2 obtained by crushing and shaping + 200-mesh Fe-Si-Al unqualified products according to a certain mass ratio (A2: 90% and B2: 10%), carrying out insulating coating treatment by additives such as phosphoric acid, organic silicon resin and zinc stearate, carrying out press forming, preheating, sintering, impregnation, chamfering and coating to obtain a metal magnetic powder core C2, and testing the magnetoelectric performance of the magnetic powder core.
Comparative example 1
And (3) carrying out insulation coating treatment on the iron-silicon-aluminum powder D3 prepared by common gas atomization by additives such as phosphoric acid, organic silicon resin, zinc stearate and the like, and then carrying out press forming, preheating, sintering, impregnation, chamfering and coating processes to obtain the metal magnetic powder core C3.
Corresponding magnetic powder cores are respectively prepared according to the sendust powder prepared by common gas atomization and the sendust powder prepared and processed by the device, and magnetoelectric performance tests are carried out, and details are shown in table 1.
TABLE 1 magnetoelectric Properties of magnetic powder cores
1. As shown in table 1 above, the loss of the metal magnetic powder core C1 prepared by the present invention is smaller than the loss of the metal magnetic powder core C3 prepared by the ordinary gas atomization, and meanwhile, the direct current superposition characteristic of the metal magnetic powder core C1 prepared by the present invention is larger than the direct current superposition characteristic of the metal magnetic powder core C3 prepared by the ordinary gas atomization, so that the metal magnetic powder core prepared by the present invention is better in the magnetoelectric property after being treated by the — 200 mesh sendust powder.
2. The-200-mesh Fe-Si-Al powder A2 prepared by the device is added into the powder B2 obtained by crushing and shaping the + 200-mesh Fe-Si-Al unqualified product, and the prepared metal magnetic powder core C2 has the loss and direct-current superposition characteristics basically equivalent to those of a metal magnetic powder core C3 prepared by common gas atomization, so that the + 200-mesh Fe-Si unqualified product is further processed in the device and can be used for preparing the metal magnetic powder core, the recycling rate of the + 200-mesh Fe-Si-Al powder unqualified product is improved, and the waste of the + 200-mesh Fe-Si-Al powder is reduced.
In the above embodiments, the skilled person can adopt the existing techniques for software control, and the present invention only protects the structure and the mutual connection relationship of the multistage processing apparatus for processing sendust powder applied to the metal magnetic powder core.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A multistage processing device of sendust powder applied to metal magnetic powder core is characterized by comprising a powder gas atomization preparation component, a rolling crushing component, a sorting component, a shaping component and a dust collector (37) which are communicated in sequence;
the powder gas atomization preparation assembly comprises a tundish (3), a multi-pass flow guide pipe (4), a plurality of atomizing nozzles (2) and an atomizing cylinder (5), wherein the tundish (3), the multi-pass flow guide pipe (4), the multi-pass flow guide pipe and the atomizing cylinder are hermetically communicated from top to bottom, the lower end of the tundish (3) is communicated with the multi-pass flow guide pipe (4), the outlet at the lower end of the multi-pass flow guide pipe (4) is matched with the corresponding atomizing nozzles (2), the atomizing cylinder (5) comprises multi-stage airflow grading pipelines communicated with the inner cavity of the atomizing cylinder (5), the airflow grading pipelines at all stages are axially distributed at different positions on the side wall of the atomizing cylinder (5), and the airflow grading pipelines at all stages are connected with the corresponding air extraction assembly and the powder collection structure;
the grinding and crushing assembly comprises a first conveyor belt (19), a lower pressing plate (20) arranged on the first conveyor belt (19) and an upper pressing plate (18) matched with the lower pressing plate (20), a pressure assembly is further arranged on the upper pressing plate (18), one end of the first conveyor belt (19) is connected with a feeding pipeline (16), the other end of the first conveyor belt is communicated with the sorting assembly, and the feeding pipeline (16) is communicated with the atomizing barrel (5);
the sorting component comprises a screening cylinder (26), a plurality of first nitrogen nozzles (27) are uniformly arranged at the bottom of the screening cylinder (26) along the circumferential radial direction, the bottom of the screening cylinder (26) is communicated with the grinding and crushing component, and the top of the screening cylinder (26) is communicated with the shaping component;
the shaping component comprises a shaping barrel (31), a plurality of groups of second nitrogen nozzles (30) in the circumferential tangential direction of the inner wall of the shaping barrel (31) are arranged in the middle of the shaping barrel (31), and the top of the shaping barrel (31) is communicated with the screening barrel (26) and the dust collector (37) respectively.
2. The multistage processing device for the sendust powder applied to the metal magnetic powder core as recited in claim 1, wherein the multi-way flow guide pipe (4) comprises an upper flow guide pipe and a plurality of lower flow guide branch pipes communicated with the upper flow guide pipe, each lower flow guide branch pipe is matched with a corresponding atomizing nozzle (2), and each atomizing nozzle (2) is connected with a corresponding first nitrogen storage tank (13).
3. The apparatus of claim 1, wherein each of the air-extracting units is a vacuum air-extracting pump, and each of the vacuum air-extracting pumps controls an internal pressure of the air classifying pipe located at the upper end to be higher than an internal pressure of the air classifying pipe located at the lower end.
4. The multistage processing device for the sendust powder applied to the metal magnetic powder core according to claim 1, wherein the bottom of the atomizing cylinder (5) is communicated with a first transition bin (11), the bottom of the atomizing cylinder (5) is further provided with a liquid nitrogen delivery port (9) and a communication port connected with a pressure release valve (10), the first transition bin (11) is communicated with a feeding pipeline (16) through a screening machine (14), and the screening machine (14) is further connected with a first material receiving bin (15).
5. The multistage processing device for sendust powder applied to metal magnetic powder cores of claim 4, wherein a plurality of connecting pipes are symmetrically distributed in each stage of airflow classifying pipe along the circumference of the atomizing barrel (5), each pipe is connected with a corresponding powder collecting structure, and the powder collecting structure at the bottommost layer is communicated with the first transition bin (11).
6. The multistage processing device for the sendust applied to the metal magnetic powder core according to any one of claims 1 to 5, wherein a double-roll crusher (23) is further arranged between the first conveyor belt (19) and the sorting assembly, a plurality of groups of serrated rollers (24) are arranged in the double-roll crusher (23), a second conveyor belt (25) is arranged below the double-roll crusher (23), one end of the second conveyor belt (25) is communicated with the inner cavity of the sieving cylinder (26), and the bottom of the sieving cylinder (26) is further communicated with the double-roll crusher (23).
7. The multistage processing device of aluminum-silicon-iron powder applied to metal magnetic powder core as recited in claim 6, wherein each first nitrogen nozzle (27) is arranged in ring symmetry, and each first nitrogen nozzle (27) is connected with the second nitrogen storage tank (28); the second nitrogen nozzles (30) in the same group are annularly arranged, and the second nitrogen nozzles (30) are connected with a fourth nitrogen storage tank (33).
8. The multistage processing device of sendust powder applied to metal magnetic powder core as claimed in claim 6, wherein the bottom of the shaping cylinder (31) is distributed with a spraying structure (32); the spraying structure (32) is composed of a plurality of third nitrogen nozzles distributed along the circumferential radial direction, and the third nitrogen nozzles are annularly and symmetrically distributed, or the spraying structure (32) is an annular structure, and one side of the spraying structure (32) close to the inner cavity of the shaping cylinder (31) is provided with an annular seam with a preset width; the injection structure (32) is also connected to a fifth nitrogen storage tank (34).
9. The multistage processing device for the ferrosilicon aluminum powder applied to the metal magnetic powder core is characterized in that the top of the shaping cylinder (31) is communicated with a cyclone separator (35), the bottom of the cyclone separator (35) is connected with a third collecting bin (36), the top of the cyclone separator (35) is also communicated with a dust collector (37), and the dust collector (37) is provided with a nitrogen gas discharge port.
10. The multistage processing device of sendust for metallic flux cores according to any one of claims 7 to 9, wherein the tundish (3) is further connected to an intermediate frequency furnace (1), and the intermediate frequency furnace (1) is used for smelting pure iron, aluminum ingots and metallic silicon in a preset mass ratio.
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