CN113198614B - Automatic sieving mechanism of neodymium iron boron magnetic powder - Google Patents
Automatic sieving mechanism of neodymium iron boron magnetic powder Download PDFInfo
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- CN113198614B CN113198614B CN202110372616.1A CN202110372616A CN113198614B CN 113198614 B CN113198614 B CN 113198614B CN 202110372616 A CN202110372616 A CN 202110372616A CN 113198614 B CN113198614 B CN 113198614B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/26—Magnetic separation acting directly on the substance being separated with free falling material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
- B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
- B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
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- Combined Means For Separation Of Solids (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The application discloses an automatic sieving device for neodymium iron boron magnetic powder, which comprises a dispersing mechanism, a sieving barrel, an offset mechanism and a controller. The offset mechanism comprises a protection plate and a plurality of magnets. The guard plate is located the opposite side of screening barrel inner space, and is parallel and have one section clearance with the inner wall of screening barrel. The magnets are electromagnets, and a plurality of magnets are sequentially distributed in the gap from top to bottom and have the same distance with the central line of the dispersing mechanism. The magnetism of the magnets is weakened from top to bottom in sequence, and different magnetic attractive forces are generated corresponding to the neodymium iron boron magnetic powder in a plurality of particle size ranges. The magnetic field generated by each magnet covers the falling space below the dispersing mechanism. And the controller adjusts the magnetic force of each magnet by inquiring a preset corresponding relation of the particle size and the data in the magnetic force comparison table according to the particle size range of the NdFeB magnetic powder. The application improves the sieving efficiency of the neodymium iron boron magnetic powder and ensures the sieving quality and purity of the neodymium iron boron magnetic powder.
Description
The application relates to an automatic sieving device for neodymium iron boron magnetic powder and a divisional application of an automatic sieving method thereof, which have the application number of CN 201910879477.4 and the application date of 2019/09/18.
Technical Field
The application relates to a screening device in the technical field of screening, in particular to an automatic screening device for neodymium iron boron magnetic powder.
Background
The neodymium-iron-boron magnet is a tetragonal crystal formed of neodymium, iron, and boron. This magnet is a permanent magnet whose magnetism is inferior to that of an absolute zero holmium magnet nowadays, and is also the most commonly used rare earth magnet. Neodymium-iron-boron magnets are widely used in electronic products such as hard disks, cell phones, headphones, battery powered tools, and the like. The neodymium-iron-boron is divided into sintered neodymium-iron-boron and bonded neodymium-iron-boron, and the bonded neodymium-iron-boron has magnetism in all directions and is corrosion-resistant; the sintered NdFeB is easy to corrode, and the surface of the sintered NdFeB needs a plating layer, and the sintered NdFeB is generally galvanized, nickel, environment-friendly zinc, environment-friendly nickel, nickel-copper-nickel, environment-friendly nickel-copper-nickel and the like. The sintered NdFeB is generally divided into axial magnetization and radial magnetization, and is determined according to the required working surface.
In the production process of the neodymium iron boron permanent magnet material, the magnetic powder needs to be screened, so that impurities in the magnetic powder are screened, and the coarse powder and the fine powder of the magnetic powder are separated, so that the influence of the difference of the coarse powder and the fine powder on the stability and the magnetism of later use is avoided, and a screening device is needed. However, the screening effect of the existing NdFeB magnetic powder screening device is relatively poor, and the screening process is easy to accumulate and block the screen, so that the screening efficiency is relatively low.
Disclosure of Invention
The application provides an automatic sieving device for neodymium iron boron magnetic powder, which aims to solve the technical problems that the sieving effect of the existing sieving device for neodymium iron boron magnetic powder is relatively poor and the sieving efficiency is relatively low.
The application is realized by adopting the following technical scheme: an automatic sieving mechanism of neodymium iron boron magnetic powder, it includes:
the dispersing mechanism is used for cutting the blocky powder clusters in the neodymium iron boron magnetic powder to form neodymium iron boron magnetic powder;
a sieving barrel which receives the neodymium iron boron magnetic powder;
an offset mechanism comprising a guard plate and a plurality of magnets; the protection plate is positioned at the opposite side of the inner space of the screening barrel, is parallel to the inner wall of the screening barrel and is provided with a section of gap; the magnets are electromagnets, and a plurality of magnets are sequentially distributed in the gap from top to bottom and have the same distance with the central line of the dispersing mechanism; the magnetism of the plurality of magnets is weakened from top to bottom in sequence, and different magnetic attractive forces are generated corresponding to the neodymium iron boron magnetic powder in a plurality of particle size ranges; the magnetic field generated by each magnet covers the falling space below the dispersing mechanism, so that the NdFeB magnetic powder with the corresponding particle size range can transversely generate corresponding offset under the action of magnetic attraction;
the controller is used for adjusting the magnetic force of each magnet by inquiring a preset corresponding relation of the particle size and the magnetic force in the magnetic force comparison table according to the particle size range of the neodymium iron boron magnetic powder; wherein, the particle size range and the magnetic force have a one-to-one corresponding data corresponding relationship in the particle size-magnetic force comparison table.
As a further improvement of the above, the dispersing mechanism includes:
the rotary drum is rotatably arranged on the screening barrel, and the bottom end of the rotary drum is positioned in the screening barrel and positioned at the opposite side of the inner space of the screening barrel; the distances between the plurality of magnets and the central line of the rotary drum are the same; the magnetic field generated by each magnet covers the falling space below the rotary cylinder;
the feeding pipe is arranged on the screening barrel, the bottom end of the feeding pipe is positioned in the top end of the rotary barrel, and the feeding pipe is used for conveying neodymium iron boron magnetic powder into the rotary barrel;
the cutting assembly is fixed in the rotary drum and can cut blocky powder clusters in the neodymium iron boron magnetic powder falling from the feeding pipe;
and the driving component is used for driving the rotary cylinder to rotate relative to the screening barrel, so that the cutting component rotates along with the rotary cylinder to cut up the blocky powder dough.
Further, the controller is further used for referring to a preset specific gravity-rotating speed comparison table data corresponding relation according to the specific gravity of the block powder in the neodymium iron boron magnetic powder in unit volume and adjusting the rotating speed of the rotating cylinder through the driving component; and the specific gravity and the rotating speed have a one-to-one corresponding data corresponding relation in the specific gravity-rotating speed comparison table.
Further, the cutting assembly includes a cutting blade that is helical; the cutting knife is installed on the inner wall of the rotary cylinder, and the center shaft coincides with the center line of the rotary cylinder.
As a further improvement of the above solution, the automatic screening device further comprises a collecting mechanism;
the mechanism that gathers materials includes:
the first collecting barrel is arranged on the bottom wall of the screening barrel and is positioned below the rotary barrel; a first discharge hole is formed in the bottom end of the first collecting barrel, and the inner diameter of the first collecting barrel is larger than that of the rotary barrel;
the first telescopic component is arranged on the bottom wall of the screening barrel and can be used for opening or closing the first discharge hole through telescopic operation;
a plurality of second collecting barrels corresponding to the plurality of magnets respectively, wherein each second collecting barrel is used for collecting neodymium iron boron magnetic powder deviated by the corresponding magnet; the second collecting barrel is arranged on the bottom wall of the screening barrel, and the bottom end of the second collecting barrel is provided with a second discharge hole; and
and a plurality of second telescopic assemblies respectively corresponding to the second collecting barrels, wherein each second telescopic assembly is arranged on the bottom wall of the screening barrel and is telescopic to open or close the corresponding second discharge hole.
Further, the automatic screening device further comprises:
the detection mechanism is used for detecting the collection amount of the NdFeB magnetic powder in the first collecting barrel and the second collecting barrel.
Preferably, the detection mechanism includes:
the emitter and the receiver of the first infrared sensor are arranged on the inner wall of the first collecting barrel and are oppositely arranged; and
the second infrared sensors are respectively corresponding to the second collecting barrels, and the emitter and the receiver of each second infrared sensor are arranged on the inner wall of the corresponding second collecting barrel and are oppositely arranged;
when the collection amount of the neodymium iron boron magnetic powder in the first collecting barrel exceeds the preset magnetic powder amount, an optical path between a transmitter and a receiver of the first infrared sensor is interrupted by the neodymium iron boron magnetic powder, so that the first infrared sensor generates a first trigger signal for the controller to drive the first telescopic assembly; when the collection amount of the neodymium iron boron magnetic powder in the second collection barrel exceeds the preset magnetic powder amount II, the emitter and the receiver of the corresponding infrared sensor II are blocked by the neodymium iron boron magnetic powder, so that the corresponding infrared sensor II generates a trigger signal II for the controller to drive the corresponding telescopic assembly II.
Preferably, the detection mechanism includes:
the weighing sensor I is arranged in the screening barrel and is used for detecting the weight of the NdFeB magnetic powder in the collecting barrel I; and
a plurality of weighing sensors II respectively corresponding to the collecting barrels II, wherein each weighing sensor II is arranged in the screening barrel and used for detecting the weight of the neodymium iron boron magnetic powder in the corresponding collecting barrel II;
when the weight of the NdFeB magnetic powder in the first collecting barrel exceeds a preset weight, the controller drives the first telescopic component to extend out; when the weight of the NdFeB magnetic powder in the second collecting barrel exceeds a preset weight II, the controller drives the corresponding second telescopic component to extend out.
Preferably, the controller is further configured to drive the first telescopic component to extend when the collection amount of the neodymium iron boron magnetic powder in the first collection bucket exceeds a preset magnetic powder amount, so that the first discharge port is opened, and drive the first telescopic component to shrink after reaching a preset time, so that the first discharge port is closed; the controller is further used for driving the corresponding second telescopic assembly to extend when the collection amount of the neodymium iron boron magnetic powder in one second collecting barrel exceeds a preset magnetic powder amount II, so that the corresponding second discharge port is opened, and driving the corresponding second telescopic assembly to shrink after reaching a preset time II, so that the corresponding second discharge port is closed.
As a further improvement of the above, the offset mechanism further includes:
a plurality of air nozzles respectively corresponding to the plurality of magnets, wherein each air nozzle blows air towards the corresponding magnet so as to increase the deflection of the NdFeB magnetic powder in the corresponding particle size range; and
the electronic air valves are respectively corresponding to the air nozzles, and each electronic air valve is arranged on the corresponding air nozzle and is used for adjusting the air inflow of the corresponding air nozzle;
the controller is also used for inquiring a preset data corresponding relation in a particle size-air inflow comparison table according to the particle size range of the neodymium iron boron magnetic powder, and adjusting the air inflow of the corresponding air nozzle through each electronic air valve; the particle size range and the air inflow have a one-to-one corresponding data corresponding relation in a particle size-air inflow comparison table.
According to the application, the cutting assembly in the dispersing mechanism cuts the blocky powder clusters in the rotary drum, so that the neodymium-iron-boron magnetic powder is fully dispersed after passing through the dispersing mechanism, and then the dispersed neodymium-iron-boron magnetic powder can generate certain offset according to the size of the particle size in the falling process, the smaller the particle size is, the larger the offset distance of the neodymium-iron-boron magnetic powder is, the sieving of the neodymium-iron-boron magnetic powder can be realized, the impurities can not be influenced by a magnetic field, the direct vertical falling is realized, the impurity in the magnetic powder is sieved, the coarse and fine powder separation of the magnetic powder is realized, the impurity is collected for a while by the collecting barrels in the collecting mechanism, the neodymium-iron-boron magnetic powder with different particle sizes is sequentially collected by the collecting barrels, and in the collecting process, the collecting amount is detected by the detecting mechanism, so that the controller can control the opening and closing of the discharge port I or the discharge port II in real time, the overflow of the collecting barrels is avoided, the controller can also control the rotating speed of the rotary drum according to the content of the blocky powder clusters, the full sieving quality is ensured, the sieving effect of the neodymium-iron-boron magnetic powder is improved, and the sieving quality of the sieving device is better than the prior art is realized, and the sieving effect of the sieving and the sieving quality of the neodymium-iron-boron magnetic powder is better is realized.
Compared with the prior art, the application has the following beneficial effects:
1. this automatic sieving mechanism of neodymium iron boron magnetic powder, it cuts up cubic powder group in with the neodymium iron boron magnetic powder through dispersion mechanism, with fully dispersion, then through the neodymium iron boron magnetic powder after the skew mechanism sieves, the neodymium iron boron magnetic powder of different particle diameters can produce and need not squint, collect according to the difference of neodymium iron boron magnetic powder particle diameter at last, the impurity can be directly collected alone, both realized sieving out the impurity in the magnetic powder like this, also realized separating the thick fine powder of magnetic powder, and then improve the screening efficiency of neodymium iron boron magnetic powder, cut up the neodymium iron boron magnetic powder of caking moreover, thereby improve screening effect, guarantee the screening quality of neodymium iron boron magnetic powder. Wherein, because the drive effect of drive assembly can produce relative rotation between dispersion mechanism's pan feeding pipe and the rotary drum, can be cut by cutting assembly at the in-process that neodymium iron boron magnetic powder falls into the rotary drum from the pan feeding pipe like this for cubic powder group is fully cut up, and then plays the effect of dispersion. The polylith magnet of offset mechanism can produce the magnetic field, and the neodymium iron boron magnetic powder of different particle diameters is because the weight is different, and the magnetism effort that it received is also different, and then the produced lateral deviation of whereabouts in-process in screening bucket also can be different, and the neodymium iron boron magnetic powder in same particle diameter scope produces near lateral deviation to whereabouts to same region, thereby realize the automatic screening to neodymium iron boron magnetic powder, the screen cloth is not used in whole in-process moreover and screening is not produced, can not produce the possibility that neodymium iron boron magnetic powder blockked up the screen cloth, therefore need not carry out manual maintenance, thereby improve screening efficiency. The first collecting barrels of the collecting mechanism can collect impurities which do not deviate in the falling process, and the second collecting barrels can collect neodymium iron boron magnetic powder with different particle sizes according to different deviations of the neodymium iron boron magnetic powder, so that sieving and collecting of the neodymium iron boron magnetic powder are achieved.
2. This automatic sieving mechanism of neodymium iron boron magnetic powder, its controller is according to the collection volume of neodymium iron boron magnetic powder that detection mechanism detected, when the collection volume of neodymium iron boron magnetic powder in collecting vessel one exceeded the default magnetic powder volume, it is in order to export the impurity that sieves out to drive discharge gate one, and when the collection volume of neodymium iron boron magnetic powder in arbitrary one collecting vessel two exceeded the default magnetic powder volume two, then drive discharge gate two open in order to export the magnetic powder that sieves out, can avoid in the in-process of sieving like this because impurity or magnetic powder pile up too much and mix into each other, guarantee the purity degree of the magnetic powder of sieving out. Moreover, the controller can also adjust the rotating speed of the rotating cylinder according to the proportion of the blocky powder clusters in the neodymium iron boron magnetic powder in unit volume, so that the basic dispersing requirement can be ensured, the damage of excessive cutting to the neodymium iron boron magnetic powder can be prevented, and the utilization rate of energy sources is improved.
3. This automatic sieving mechanism of neodymium iron boron magnetic powder, the magnet of its offset mechanism can select the electro-magnet, and the controller can obtain the required magnetic force of each magnet through the inquiry according to the particle diameter scope of neodymium iron boron magnetic powder, thereby adjust each magnet, neodymium iron boron magnetic powder can shift according to the magnetic force size like this, thereby can obtain the magnetic powder of various particle diameter scope, just so can screen according to the demand in practical application in order to obtain the magnetic powder of required particle diameter, the screening to neodymium iron boron magnetic powder is convenient greatly, can satisfy the screening application demand of various particle diameters. This automatic sieving mechanism of neodymium iron boron magnetic powder still can set up tuyere and electron pneumatic valve, and the tuyere can be bloied and carry out further skew to neodymium iron boron magnetic powder to strengthen the skew effect of skew mechanism, especially when the magnetic force of magnet is not enough attracts the neodymium iron boron magnetic powder of big particle diameter, the tuyere can guarantee the production of skew. The controller can control the air inflow through the electronic air valve according to corresponding data corresponding relation, avoids the adverse effect of large air quantity on screening, and simultaneously can make different air nozzles blow out different air quantity wind according to requirements, so that part of magnetic powder with smaller particle size can deviate in advance, and the other part of magnetic powder with larger particle size can deviate by one step later, and the effect of deviation screening can be guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of an automatic sieving device for neodymium iron boron magnetic powder in embodiment 1 of the present application;
fig. 2 is an enlarged view of a region a in fig. 1;
fig. 3 is an enlarged view of a region B in fig. 1;
fig. 4 is an external view of the automatic sieving device for neodymium iron boron magnetic powder in fig. 1;
fig. 5 is an enlarged view of region C in fig. 4;
fig. 6 is a schematic structural diagram of an automatic sieving device for neodymium iron boron magnetic powder in embodiment 3 of the present application;
fig. 7 is a schematic structural diagram of an automatic sieving device for neodymium iron boron magnetic powder in embodiment 4 of the present application;
fig. 8 is a schematic structural diagram of an automatic sieving device for neodymium iron boron magnetic powder in embodiment 5 of the present application.
Symbol description:
1. cutting knife of screening barrel 13
2. Feed pipe 14 driving motor
3. Rotary drum 15 gear one
4. Protection plate 16 gear II
5. Magnet 17 electric telescopic part I
6. First collecting barrel 18 baffle
8. Electric telescopic part II of collecting barrel II 19
9. 20 baffle plates of discharge port one
10. Discharge outlet two 21 infrared sensor one
11. Air nozzle 22 infrared sensor II
12. Electronic air valve 23 screen
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Example 1
Referring to fig. 1-5, the present embodiment provides an automatic sieving device for neodymium iron boron magnetic powder, which can sieve externally fed neodymium iron boron magnetic powder to obtain magnetic powder with different particle sizes and non-magnetic impurities. The neodymium iron boron magnetic powder automatic screening device comprises a screening barrel 1, a dispersing mechanism, an offset mechanism, a material collecting mechanism, a detecting mechanism and a controller.
The screening barrel 1 can be a round barrel or a square barrel, and can also be a barrel body with other shapes. In this embodiment, in order to avoid that neodymium iron boron magnetic powder is adsorbed on the inner wall of the sieving barrel 1, the sieving barrel 1 is made of a material which is a nonmetallic material, for example, plastic or wood. The screening bucket 1 is used as a place for screening neodymium iron boron magnetic powder in the embodiment, and the size of the screening bucket can be set according to the screening amount of the neodymium iron boron magnetic powder, and the size of the screening bucket can be adjusted according to the installation space adaptability of the screening device in practice. Generally, the sieving basket 1 is placed vertically on the ground, and in some embodiments, the sieving basket 1 may be placed on a deck, and its bottom is provided with a plurality of outlets for outputting the sieved magnetic powder and impurities.
The dispersing mechanism comprises a feeding pipe 2, a rotary cylinder 3, a cutting assembly and a driving assembly, and is used for carrying out preliminary dispersion on the neodymium-iron-boron magnetic powder so as to disperse massive powder in the neodymium-iron-boron magnetic powder into powder. The feeding pipe 2 is mounted on the sieving barrel 1, and its bottom end is located in the top end of the rotary barrel 3 and is used for conveying neodymium iron boron magnetic powder into the rotary barrel 3. The top end of the feeding pipe 2 is used for receiving externally input neodymium iron boron magnetic powder, and the outside can input the neodymium iron boron magnetic powder into the feeding pipe 2 through other feeding mechanisms, for example, a funnel and other structures are adopted. The rotary drum 3 is rotatably mounted on the screening drum 1 and the bottom end is located in the screening drum 1 on the opposite side of the inner space of the screening drum 1. The rotary drum 3 may be mounted by means of bearings or the like to ensure that the frictional resistance is sufficiently small during rotation. The cutting assembly is fixed in the rotary drum 3 and can cut the lump powder in the neodymium iron boron magnetic powder falling from the feeding pipe 2. The driving component is used for driving the rotary drum 3 to rotate relative to the screening barrel 1, so that the cutting component follows the rotary drum 3 to cut up the blocky powder dough. The feeding pipe 2 and the rotary cylinder 3 can relatively rotate under the driving action of the driving component, so that the neodymium iron boron magnetic powder can be cut by the cutting component in the process of falling into the rotary cylinder 3 from the feeding pipe, and the blocky powder clusters are fully cut up to further play a role of dispersing.
In this embodiment, the cutting assembly comprises a cutting blade 13, the cutting blade 13 being helical. The cutter 13 is mounted on the inner wall of the rotary drum 3 with the central axis coinciding with the centre line of the rotary drum 3. Thus, when the rotary cylinder 3 rotates, the cutter 13 rotates along with the rotary cylinder, so that the block-shaped powder clusters falling from the feeding pipe 2 rotate relative to the cutter 13, and the block-shaped powder clusters are chopped. In the practical application process, the length of the rotary cylinder 3 can be adaptively increased, and the length of the cutting knife 13 is also increased, so that the blocky powder clusters are fully cut, and the blocky powder clusters are more thoroughly dispersed. In other embodiments, the cutting assembly may be comprised of other assemblies, such as chopping the mass of dough by way of a plurality of saw tooth structures or stirring bars.
The driving assembly in this embodiment includes a driving motor 14, a first gear 15 and a second gear 16. The driving motor 14 is installed on the sieving barrel 1, and the rotating shaft is parallel to the center line of the rotating barrel 3. The first gear 15 is mounted on the output shaft of the drive motor 14 and meshes with the second gear 16. The second gear 16 is mounted on the rotary drum 3 and is coaxially disposed with the rotary drum 3. When the rotary cylinder 3 needs to be rotated, the first gear 15 can be driven to rotate by the rotation of the driving motor 14, so that the first gear 15 drives the second gear 16 to rotate, and the rotary cylinder 3 is further driven to rotate. It should be noted that, in other embodiments, multiple sets of gears or gearboxes may be disposed between the first gear 15 and the second gear 16, so as to adjust the rotation speed of the rotary drum 3, and increase the torque of the rotation of the rotary drum 3. In other embodiments, the driving assembly may also drive the rotation cylinder 3 to rotate in other ways, and may even rotate by manual rotation.
The offset mechanism comprises a protection plate 4 and a plurality of magnets 5, and is used for offset screening of neodymium iron boron magnetic powder falling from the rotary cylinder 3. The protection plate 4 is positioned on the opposite side of the inner space of the sieving barrel 1, is parallel to the inner wall of the sieving barrel 1 and has a gap. The magnets 5 are sequentially distributed in the gap from top to bottom and have the same distance from the center line of the rotary cylinder 3. In particular, the magnets 5 may be fixed to the shielding plate 4 or to the inner wall of the screening drum 1, but may of course also be arranged between the screening drum 1 and the shielding plate 4 by other structures. The magnetic field generated by each magnet 5 can cover the falling space below the rotary cylinder 3, so that the NdFeB magnetic powder with the corresponding particle size range can transversely generate corresponding offset under the action of magnetic attraction. Because the magnetic field can be generated by the plurality of magnets 5, the magnetic acting force of neodymium iron boron magnetic powder with different particle sizes is different due to different weights, and then the transverse offset generated in the falling process in the sieving barrel 1 is also different, the neodymium iron boron magnetic powder in the same particle size range generates similar transverse offset and falls to the same area, so that the automatic sieving of the neodymium iron boron magnetic powder is realized, a screen is not used in the whole process, the possibility that the screen is blocked by the neodymium iron boron magnetic powder is avoided, and manual maintenance is not needed, so that the sieving efficiency is improved.
The collecting mechanism comprises a first collecting barrel 6, a first telescopic assembly, a second plurality of collecting barrels 8 and a second plurality of telescopic assemblies, and the collecting mechanism is used for collecting the screened impurities or magnetic powder. The first collecting barrel 6 is arranged on the bottom wall of the screening barrel 1 and is positioned below the rotary barrel 3. The bottom end of the first collecting barrel 6 is provided with a first discharge hole 9, and the inner diameter of the first collecting barrel 6 is larger than that of the rotary barrel 3. The first collecting vessel 6 may be arranged coaxially with the rotating vessel 3 such that the non-magnetic impurities falling from the rotating vessel 3 directly fall into the first collecting vessel 6. The first telescopic assembly is arranged on the bottom wall of the screening barrel 1 and can be used for opening or closing the first discharge hole 9 by telescopic operation. The second collecting barrels 8 are respectively corresponding to the magnets 5, and each second collecting barrel 8 is used for collecting neodymium iron boron magnetic powder offset by the corresponding magnet 5. The second collecting barrel 8 is arranged on the bottom wall of the screening barrel 1, and the bottom end is provided with a second discharge hole 10. The second telescopic components respectively correspond to the second collecting barrels 8, are arranged on the bottom wall of the screening barrel 1 and can be used for opening or closing the second corresponding discharge ports 10 through telescopic operation. The first collecting barrel 6 can collect impurities which do not deviate in the falling process, and the second collecting barrels 8 can collect neodymium iron boron magnetic powder with different particle sizes according to different deviations of the neodymium iron boron magnetic powder, so that sieving and collecting of the neodymium iron boron magnetic powder are achieved.
In this embodiment, the first telescopic assembly includes a first motor telescopic member 17 and a first shutter 18. The first electric telescopic member 17 is mounted on the bottom wall of the screening drum 1. The first baffle 18 is fixed on the telescopic end of the first electric telescopic member 17, and opens or closes the first discharge port 9 when the first electric telescopic member 17 is telescopic. Each second telescopic assembly comprises a second electric telescopic member 19 and a second baffle 20. The second electric telescopic member 19 is mounted on the bottom wall of the screening drum 1. The second baffle 20 is fixed on the telescopic end of the second electric telescopic member 19, and opens or closes the second discharge port 10 when the second electric telescopic member 19 stretches and contracts.
The detection mechanism is used for detecting the collection amount of the NdFeB magnetic powder in the first collection barrel 6 and the second collection barrel 8. In the present embodiment, the detection mechanism includes the first infrared sensor 21 and the second plurality of infrared sensors 22. The emitter and the receiver of the first infrared sensor 21 are installed on the inner wall of the first collecting tank 6 and are disposed opposite to each other. The emitter and the receiver of each second infrared sensor 22 are mounted on the inner wall of the corresponding second collecting tank 8 and are disposed opposite to each other. When the collection amount of the neodymium iron boron magnetic powder in the collection barrel I6 exceeds the preset magnetic powder amount, an optical path between a transmitter and a receiver of the infrared sensor I21 is interrupted by the neodymium iron boron magnetic powder, so that the infrared sensor I21 generates a trigger signal I for a controller to drive the telescopic assembly I. When the collection amount of the neodymium iron boron magnetic powder in the second collection barrel 8 exceeds the preset magnetic powder amount II, the emitter and the receiver of the corresponding second infrared sensor 22 are blocked by the neodymium iron boron magnetic powder, so that the corresponding second infrared sensor 22 generates a second trigger signal for the controller to drive the corresponding second telescopic assembly.
The controller is used for referring to a preset specific gravity-rotating speed comparison table data corresponding relation according to the specific gravity of the block powder in the neodymium iron boron magnetic powder in unit volume and adjusting the rotating speed of the rotary drum 3 through the driving component. The specific gravity and the rotating speed have a one-to-one corresponding data corresponding relation in a specific gravity-rotating speed comparison table. The controller is also used for driving the first telescopic component to stretch out when the collection amount of the neodymium iron boron magnetic powder in the first collecting barrel 6 exceeds a preset magnetic powder amount, so that the first discharge port 9 is opened, and driving the first telescopic component to shrink after reaching a preset time, so that the first discharge port 9 is closed. The controller is further used for driving the corresponding second telescopic component to extend when the collection amount of the neodymium iron boron magnetic powder in one of the second collection barrels 8 exceeds a preset magnetic powder amount II, so that the corresponding second discharge port 10 is opened, and driving the corresponding second telescopic component to shrink after reaching a preset time II, so that the corresponding second discharge port 10 is closed. Therefore, the controller can avoid the mutual mixing of the magnetic powder due to excessive accumulation of impurities or the magnetic powder in the screening process, and ensure the purity of the screened magnetic powder. Moreover, the controller can also adjust the rotating speed of the rotating cylinder 3 according to the proportion of the blocky powder clusters in the neodymium iron boron magnetic powder in unit volume, so that on one hand, the basic dispersing requirement can be ensured, the damage of excessive cutting to the neodymium iron boron magnetic powder can be prevented, and meanwhile, the utilization rate of energy sources is improved.
To sum up, compared with the existing magnetic powder screening device, the neodymium iron boron magnetic powder automatic screening device of the embodiment has the following advantages:
1. this automatic sieving mechanism of neodymium iron boron magnetic powder, it cuts up cubic powder group in with the neodymium iron boron magnetic powder through dispersion mechanism, with fully dispersion, then through the neodymium iron boron magnetic powder after the skew mechanism sieves, the neodymium iron boron magnetic powder of different particle diameters can produce and need not squint, collect according to the difference of neodymium iron boron magnetic powder particle diameter at last, the impurity can be directly collected alone, both realized sieving out the impurity in the magnetic powder like this, also realized separating the thick fine powder of magnetic powder, and then improve the screening efficiency of neodymium iron boron magnetic powder, cut up the neodymium iron boron magnetic powder of caking moreover, thereby improve screening effect, guarantee the screening quality of neodymium iron boron magnetic powder. Wherein, because drive assembly's drive effect can produce relative rotation between dispersion mechanism's pan feeding pipe 2 and the rotary drum 3, can be cut by cutting assembly at the in-process that neodymium iron boron magnetic powder falls into rotary drum 3 from pan feeding pipe 2 like this for cubic powder is fully minced, and then plays the effect of dispersion. The magnetic field can be produced to the polylith magnet 5 of offset mechanism, and the neodymium iron boron magnetic powder of different particle diameters is because the weight is different, and the magnetism effort that it received is also different, and then the produced lateral deviation of whereabouts in-process in screening bucket 1 also can be different, and the neodymium iron boron magnetic powder in same particle diameter scope produces similar lateral deviation, and whereabouts to same region, thereby realize the automatic screening to neodymium iron boron magnetic powder, and whole in-process does not use the screen cloth to screen, can not produce the possibility that neodymium iron boron magnetic powder blockked up the screen cloth, therefore need not carry out manual maintenance, thereby improve screening efficiency. The first collecting barrel 6 of the collecting mechanism can collect impurities which do not deviate in the falling process, and the second collecting barrels 8 can collect neodymium iron boron magnetic powder with different particle sizes according to different deviations of the neodymium iron boron magnetic powder, so that sieving and collecting of the neodymium iron boron magnetic powder are achieved.
2. This automatic sieving mechanism of neodymium iron boron magnetic powder, its controller is according to the collection volume of neodymium iron boron magnetic powder that detection mechanism detected, when the collection volume of neodymium iron boron magnetic powder in collecting vessel one 6 exceeded the default magnetic powder volume, order about discharge gate one 9 to open in order to export the impurity that sieves out, and when the collection volume of neodymium iron boron magnetic powder in arbitrary one collecting vessel two 8 exceeded the default magnetic powder volume two, then order about discharge gate two 10 to open in order to export the magnetic powder that sieves out, can avoid in the in-process of sieving like this because impurity or magnetic powder pile up too much and mix into each other, guarantee the purity degree of the magnetic powder that sieves out. Moreover, the controller can also adjust the rotating speed of the rotating cylinder 3 according to the proportion of the blocky powder clusters in the neodymium iron boron magnetic powder in unit volume, so that on one hand, the basic dispersing requirement can be ensured, the damage of excessive cutting to the neodymium iron boron magnetic powder can be prevented, and meanwhile, the utilization rate of energy sources is improved.
Example 2
The present embodiment provides an automatic sieving device for neodymium iron boron magnetic powder, which is similar to the device of embodiment 1, and the only difference is that the magnet 5 in the present embodiment is an electromagnet, and the function of the controller is increased. The controller is also used for adjusting the magnetic force of each magnet 5 by inquiring a preset corresponding relation of the particle size and the magnetic force in the magnetic force comparison table according to the particle size range of the NdFeB magnetic powder. Wherein, the particle size range and the magnetic force have a one-to-one corresponding data corresponding relation in a particle size-magnetic force comparison table. Like this, in practical application, the controller can obtain the required magnetic force of each magnet 5 through the inquiry according to the particle diameter scope of neodymium iron boron magnetic powder to adjust each magnet 5, neodymium iron boron magnetic powder can deviate according to the magnetic force size like this, thereby can obtain the magnetic powder of various particle diameter scope, just so can screen according to the demand in practical application in order to obtain the magnetic powder of required particle diameter, the screening of convenient to neodymium iron boron magnetic powder greatly can satisfy the screening application demand of various particle diameters.
Example 3
Referring to fig. 6, the present embodiment provides an automatic sieving device for neodymium iron boron magnetic powder, which adds a part of structures belonging to the offset mechanism on the basis of embodiment 1. Wherein the offset mechanism further comprises a plurality of air nozzles 11 and a plurality of electronic air valves 12. The plurality of air nozzles 11 respectively correspond to the plurality of magnets 5, and each air nozzle 11 blows air towards the corresponding magnet 5 so as to increase the deflection of the neodymium iron boron magnetic powder in the corresponding particle size range. The plurality of electronic air valves 12 correspond to the plurality of tuyeres 11, respectively, and each electronic air valve 12 is mounted on the corresponding tuyeres 11 and is used for adjusting the intake air amount of the corresponding tuyeres 11. The controller is further configured to query a preset data correspondence relationship in a particle size-air inflow comparison table according to a particle size range of the neodymium iron boron magnetic powder, and adjust the air inflow of the corresponding air nozzle 11 through each electronic air valve 12. The particle size range and the air inflow have a one-to-one corresponding data corresponding relation in a particle size-air inflow comparison table.
Like this, tuyere 11 can blow and carry out further skew to neodymium iron boron magnetic powder to strengthen the skew effect of offset mechanism, especially when the magnetic force of magnet 5 is not enough to attract the neodymium iron boron magnetic powder of big particle diameter, tuyere 11 can guarantee the production of skew. The controller can control the air inflow through the electronic air valve 12 according to corresponding data corresponding relation, avoids the adverse effect of large air quantity on screening, and simultaneously can make different air nozzles 11 blow out different air quantity wind according to requirements, so that part of magnetic powder with smaller particle size can shift in advance, and the other part of magnetic powder with larger particle size can shift by one step later, and the effect of shifting screening can be guaranteed.
Example 4
Referring to fig. 7, the present embodiment provides an automatic sieving device for neodymium iron boron magnetic powder, which is similar to the device of embodiment 1, except that the structure of the detecting mechanism is different, and the first telescopic assembly is located in the first collecting bucket 6, and the second telescopic assembly is located in the second corresponding collecting bucket 8. In this embodiment, the detection mechanism includes a first load cell and a plurality of second load cells. The first weighing sensor is arranged in the screening barrel 1 and is used for detecting the weight of the NdFeB magnetic powder in the first collecting barrel 6. The second weighing sensors are respectively corresponding to the second collecting barrels 8, are arranged in the screening barrel 1 and are used for detecting the weight of the neodymium iron boron magnetic powder in the corresponding second collecting barrels 8. When the weight of the neodymium iron boron magnetic powder in the first collecting barrel 6 exceeds a preset weight, the controller drives the first telescopic component to extend out. When the weight of the NdFeB magnetic powder in the second collecting barrel 8 exceeds a preset weight II, the controller drives the corresponding second telescopic component to extend out. Therefore, in this embodiment, the collection amount is measured by weight, and the preset magnetic powder amount corresponds to the preset weight, so that the collection amount can be counted in time, and in other embodiments, a display may be added. A display may be mounted on the outer wall of the screening drum 1 for directly displaying the weight of the neodymium iron boron magnetic powder in the respective second 8 and first 6 collector drums.
Example 5
Referring to fig. 8, the present embodiment provides an automatic sieving device for neodymium iron boron magnetic powder, which is added with a screen 23 based on embodiment 1. The number of the screens 23 is at least one, and in this embodiment, one screen 23 is selected for convenience of description. A screen 23 is mounted in the screening drum 1 between the rotating drum 3 and the topmost magnet 5. Like this, when there is great cubic impurity or neodymium iron boron piece in the neodymium iron boron magnetic powder, screen cloth 23 just can directly intercept, conveniently sieves neodymium iron boron magnetic powder, can avoid extravagant neodymium iron boron piece moreover, improves the utilization ratio of material.
Example 6
The embodiment provides an automatic sieving method for neodymium iron boron magnetic powder, which is applied to any one of the automatic sieving devices for neodymium iron boron magnetic powder provided in the embodiments 1 to 5, and comprises the following steps:
measuring the specific gravity of a block powder cluster in a unit volume of neodymium iron boron magnetic powder in the feeding pipe 2; the measurement can be performed manually, and the detection and the statistical measurement can be performed through a sonar detector;
detecting the collection amount of the neodymium iron boron magnetic powder in the first collecting barrel 6 and the second collecting barrel 8; the detection can be performed here by the detection mechanism provided in the foregoing embodiment;
according to the specific gravity, referring to a preset specific gravity-rotating speed comparison table data corresponding relation, and adjusting the rotating speed of the rotating cylinder 3 through a driving assembly; wherein, the specific gravity and the rotating speed have a one-to-one corresponding data corresponding relation in the specific gravity-rotating speed comparison table;
when the collection amount of the neodymium iron boron magnetic powder in the collection barrel I6 exceeds a preset magnetic powder amount, driving the telescopic assembly I to extend out to enable the discharge port I9 to be opened, and driving the telescopic assembly I to shrink after reaching a preset time I to enable the discharge port I9 to be closed;
when the collection amount of the neodymium iron boron magnetic powder in one of the collection barrels II 8 exceeds a preset magnetic powder amount II, the corresponding telescopic assembly II is driven to extend, the corresponding discharge port II 10 is opened, and after reaching a preset time II, the corresponding telescopic assembly II is driven to shrink, so that the corresponding discharge port II 10 is closed.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (5)
1. An automatic sieving mechanism of neodymium iron boron magnetic powder, it includes:
the dispersing mechanism is used for cutting the blocky powder clusters in the neodymium iron boron magnetic powder to form neodymium iron boron magnetic powder; and
a sieving barrel (1) which receives the neodymium iron boron magnetic powder;
the automatic screening device is characterized by further comprising:
an offset mechanism comprising a protection plate (4) and a plurality of magnets (5); the protection plate (4) is positioned at the opposite side of the inner space of the screening barrel (1), is parallel to the inner wall of the screening barrel (1) and has a section of gap; the magnets (5) are electromagnets, and a plurality of magnets (5) are sequentially distributed in the gap from top to bottom and have the same distance with the central line of the dispersing mechanism; the magnetism of the plurality of magnets (5) is weakened from top to bottom in sequence, and different magnetic attractive forces are generated corresponding to the neodymium iron boron magnetic powder in a plurality of particle size ranges; the magnetic field generated by each magnet (5) covers the falling space below the dispersing mechanism, so that the NdFeB magnetic powder with the corresponding particle size range can transversely generate corresponding offset under the action of magnetic attraction force;
the controller is used for adjusting the magnetic force of each magnet (5) by inquiring a preset corresponding relation of the particle size and the magnetic force in the magnetic force comparison table according to the particle size range of the neodymium iron boron magnetic powder; wherein, the particle size range and the magnetic force have a one-to-one corresponding data corresponding relation in the particle size-magnetic force comparison table;
aggregate mechanism includes: a first collecting barrel (6) which is arranged on the bottom wall of the screening barrel (1) and is positioned below the rotary barrel (3); a first discharge hole (9) is formed in the bottom end of the first collecting barrel (6), and the inner diameter of the first collecting barrel (6) is larger than the inner diameter of the rotary barrel (3); the first telescopic component is arranged on the bottom wall of the screening barrel (1) and can be used for opening or closing the first discharge hole (9) through telescopic operation; a plurality of second collecting barrels (8) respectively corresponding to the plurality of magnets (5), wherein each second collecting barrel (8) is used for collecting neodymium iron boron magnetic powder deviated by the corresponding magnet (5); the second collecting barrel (8) is arranged on the bottom wall of the screening barrel (1), and the bottom end of the second collecting barrel is provided with a second discharge hole (10); and a plurality of second telescopic components corresponding to the second collecting barrels (8) respectively, wherein each second telescopic component is arranged on the bottom wall of the screening barrel (1) and is telescopic to open or close the corresponding second discharging hole (10);
the detection mechanism is used for detecting the collection amount of the NdFeB magnetic powder in the first collecting barrel (6) and the second collecting barrel (8); the detection mechanism includes: the first infrared sensor (21), the emitter and the receiver of the first infrared sensor (21) are arranged on the inner wall of the first collecting barrel (6) and are oppositely arranged; and a plurality of second infrared sensors (22) corresponding to the second collecting barrels (8) respectively, wherein the emitter and the receiver of each second infrared sensor (22) are arranged on the inner wall of the corresponding second collecting barrel (8) and are oppositely arranged; when the collection amount of the neodymium iron boron magnetic powder in the first collecting barrel (6) exceeds the preset magnetic powder amount, an optical path between a transmitter and a receiver of the first infrared sensor (21) is interrupted by the neodymium iron boron magnetic powder, so that the first infrared sensor (21) generates a first trigger signal for the controller to drive the first telescopic assembly; when the collection amount of the neodymium iron boron magnetic powder in the second collection barrel (8) exceeds the second preset magnetic powder amount, the emitter and the receiver of the corresponding second infrared sensor (22) are blocked by the neodymium iron boron magnetic powder, so that the corresponding second infrared sensor (22) generates a second trigger signal for the controller to drive the corresponding second telescopic assembly;
the detection mechanism includes: the first weighing sensor is arranged in the screening barrel (1) and is used for detecting the weight of the NdFeB magnetic powder in the first collecting barrel (6); and a plurality of weighing sensors II which are respectively corresponding to the collecting barrels II (8), wherein each weighing sensor II is arranged in the screening barrel (1) and is used for detecting the weight of the neodymium iron boron magnetic powder in the corresponding collecting barrel II (8); when the weight of the neodymium iron boron magnetic powder in the first collecting barrel (6) exceeds a preset weight, the controller drives the first telescopic component to extend out; when the weight of the neodymium iron boron magnetic powder in the second collecting barrel (8) exceeds a second preset weight, the controller drives the corresponding second telescopic component to extend out;
the controller is also used for driving the first telescopic component to extend when the collection amount of neodymium iron boron magnetic powder in the first collecting barrel (6) exceeds a preset magnetic powder amount so as to enable the first discharge port (9) to be opened, and driving the first telescopic component to shrink after reaching a preset time, so that the first discharge port (9) is closed; the controller is also used for driving the corresponding second telescopic component to extend when the collection amount of the neodymium iron boron magnetic powder in one second collecting barrel (8) exceeds a second preset magnetic powder amount so as to enable the corresponding second discharge port (10) to be opened, and driving the corresponding second telescopic component to shrink after reaching a second preset time so as to enable the corresponding second discharge port (10) to be closed.
2. The automatic neodymium iron boron magnetic powder screening device according to claim 1, wherein the dispersing mechanism comprises:
the rotary drum (3) is rotatably arranged on the screening barrel (1), and the bottom end of the rotary drum is positioned in the screening barrel (1) and is positioned at the opposite side of the inner space of the screening barrel (1); the distances between the plurality of magnets (5) and the central line of the rotary cylinder (3) are the same; the magnetic field generated by each magnet (5) covers the falling space below the rotary cylinder (3);
the feeding pipe (2) is arranged on the screening barrel (1), the bottom end of the feeding pipe is positioned in the top end of the rotary barrel (3) and is used for conveying neodymium iron boron magnetic powder into the rotary barrel (3);
the cutting assembly is fixed in the rotary drum (3) and can cut blocky powder clusters in the neodymium iron boron magnetic powder falling from the feeding pipe (2);
and the driving assembly is used for driving the rotary drum (3) to rotate relative to the screening barrel (1) so that the cutting assembly rotates along with the rotary drum (3) to cut up the blocky powder dough.
3. The automatic sieving device for neodymium iron boron magnetic powder according to claim 2, wherein the controller is further used for referring to a preset specific gravity-rotating speed comparison table data corresponding relation according to the specific gravity of the block powder in the unit volume of neodymium iron boron magnetic powder and adjusting the rotating speed of the rotating cylinder (3) through the driving component; and the specific gravity and the rotating speed have a one-to-one corresponding data corresponding relation in the specific gravity-rotating speed comparison table.
4. An automatic sieving device for neodymium-iron-boron magnetic powder according to claim 2, characterized in that the cutting assembly comprises a cutting knife (13) in the form of a spiral; the cutting knife (13) is arranged on the inner wall of the rotary cylinder (3), and the central shaft is coincident with the central line of the rotary cylinder (3).
5. The automatic neodymium iron boron magnetic powder screening device according to claim 1, wherein the offset mechanism further comprises:
a plurality of air nozzles (11) corresponding to the plurality of magnets (5) respectively, wherein each air nozzle (11) blows air towards the corresponding magnet (5) so as to increase the deflection of the NdFeB magnetic powder in the corresponding particle size range; and
a plurality of electronic air valves (12) corresponding to the plurality of air nozzles (11), respectively, each electronic air valve (12) being mounted on the corresponding air nozzle (11) and being used for adjusting the air inflow of the corresponding air nozzle (11);
the controller is also used for inquiring a preset data corresponding relation in a particle size-air inflow comparison table according to the particle size range of the neodymium iron boron magnetic powder, and adjusting the air inflow of a corresponding air nozzle (11) through each electronic air valve (12); the particle size range and the air inflow have a one-to-one corresponding data corresponding relation in a particle size-air inflow comparison table.
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| CN201910879477.4A CN110639698B (en) | 2019-09-18 | 2019-09-18 | Automatic neodymium iron boron magnetic powder screening device and automatic screening method thereof |
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| CN116273453B (en) * | 2023-02-16 | 2024-04-26 | 江苏普隆磁电有限公司 | Automatic sieving mechanism of neodymium iron boron magnetic powder |
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| CN110639698A (en) | 2020-01-03 |
| CN113198614A (en) | 2021-08-03 |
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