阅读说明：本技术 一种钕铁硼磁粉自动筛分装置及其自动筛分方法 (Automatic neodymium iron boron magnetic powder screening device and automatic screening method thereof ) 是由 唐睿 何进 陈益民 于 2019-09-18 设计创作，主要内容包括：本发明公开一种钕铁硼磁粉自动筛分装置及其自动筛分方法,该自动筛分装置包括筛分桶、分散机构、偏移机构、集料机构、检测机构以及控制器。分散机构包括入料管、旋转筒、切割组件以及驱动组件,偏移机构包括防护板以及多块磁铁,集料机构包括收集桶一、伸缩组件一、多个收集桶二以及多个伸缩组件二。检测机构用于检测位于收集桶一及收集桶二中的钕铁硼磁粉的收集量。控制器用于根据单位体积的钕铁硼磁粉中所述块状粉团的比重,参照预设的比重-转速比照表中的数据对应关系并通过所述驱动组件调节旋转筒的转速。本发明提高钕铁硼磁粉的筛分效率,而且对结块的钕铁硼磁粉进行切碎,从而提高筛分效果,保证钕铁硼磁粉的筛分质量和纯净度。(The invention discloses an automatic neodymium iron boron magnetic powder screening device and an automatic screening method thereof. The dispersing mechanism comprises a feeding pipe, a rotating cylinder, a cutting assembly and a driving assembly, the deviation mechanism comprises a protection plate and a plurality of magnets, and the collecting mechanism comprises a first collecting barrel, a first telescopic assembly, a plurality of second collecting barrels and a plurality of second telescopic assemblies. The detection mechanism is used for detecting the collection amount of the neodymium iron boron magnetic powder in the first collection barrel and the second collection barrel. The controller is used for adjusting the rotating speed of the rotating cylinder through the driving assembly according to the specific gravity of the blocky powder lumps in the unit volume of the neodymium iron boron magnetic powder and by referring to a preset specific gravity-rotating speed comparison table according to the data corresponding relation. The invention improves the screening efficiency of the neodymium iron boron magnetic powder, and cuts the agglomerated neodymium iron boron magnetic powder, thereby improving the screening effect and ensuring the screening quality and purity of the neodymium iron boron magnetic powder.)

1. The utility model provides an automatic screening plant of neodymium iron boron magnetic, it includes:

a screening barrel (1);

characterized in that, automatic screening plant still includes:

the dispersing mechanism comprises a feeding pipe (2), a rotary drum (3), a cutting assembly and a driving assembly; 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 cylinder (3), and the feeding pipe is used for conveying the neodymium iron boron magnetic powder into the rotary cylinder (3); 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 cutting assembly is fixed in the rotary cylinder (3) and can cut blocky powder lumps in the neodymium iron boron magnetic powder falling from the feeding pipe (2); 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 the blocky powder dough into pieces;

a displacement mechanism comprising a protection plate (4) and a plurality of magnets (5); the protection plate (4) is positioned on the other side opposite to the inner space of the screening barrel (1), is parallel to the inner wall of the screening barrel (1), and is provided with a gap; the magnets (5) are sequentially distributed in the gap from top to bottom, and the distances between the magnets and the central line of the rotary cylinder (3) are the same; the magnetism of the magnets (5) is sequentially weakened from top to bottom and corresponds to the neodymium iron boron magnetic powder in a plurality of particle size ranges one by one; the magnetic field generated by each magnet (5) can cover a falling space below the rotary cylinder (3), so that the neodymium iron boron magnetic powder in the corresponding particle size range can transversely generate corresponding offset under the action of magnetic attraction force;

the collecting mechanism comprises a first collecting barrel (6), a first telescopic component, a plurality of second collecting barrels (8) and a plurality of second telescopic components which correspond to the second collecting barrels (8) respectively; the first collecting barrel (6) 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 that of the rotary barrel (3); 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) through telescoping; the plurality of second collecting barrels (8) correspond to the plurality of magnets (5) respectively, and 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 discharging port (10); the second telescopic assembly is mounted on the bottom wall of the screening barrel (1) and can be stretched to open or close the corresponding second discharge hole (10);

the detection mechanism is used for detecting the collection amount of the neodymium iron boron magnetic powder in the first collection barrel (6) and the second collection barrel (8);

the controller is used for referring to a preset data corresponding relation in a proportion-rotating speed comparison table according to the proportion of the blocky powder mass in the unit volume of the neodymium iron boron magnetic powder and adjusting the rotating speed of the rotating cylinder (3) through the driving assembly; the proportion and the rotating speed have one-to-one corresponding data correspondence in the proportion-rotating speed comparison table; the controller is also used for driving the first telescopic assembly to extend out when the collection amount of the neodymium iron boron magnetic powder in the first collection barrel (6) exceeds a preset magnetic powder amount, so that the first discharge port (9) is opened, and driving the first telescopic assembly to contract after a preset time is reached, so that the first discharge port (9) is closed; the controller is also used for driving the corresponding second telescopic assembly to extend out when the collection amount of the neodymium iron boron magnetic powder in one of the second collecting barrels (8) exceeds a preset magnetic powder amount, so that the corresponding second discharging port (10) is opened, and driving the corresponding second telescopic assembly to contract after reaching a preset time of two, so that the corresponding second discharging port (10) is closed.

2. The automatic sieving device for neodymium iron boron magnetic powder according to claim 1, characterized in that the magnet (5) is an electromagnet; the controller is also used for adjusting the magnetic force of each magnet (5) according to the particle size range of the neodymium iron boron magnetic powder by inquiring a preset particle size-magnetic force comparison table; wherein, the particle size range and the magnetic force have one-to-one corresponding data correspondence in the particle size-magnetic force comparison table.

3. The automatic sieving device for neodymium iron boron magnetic powder according to claim 1, characterized in that the offset mechanism further comprises a plurality of air nozzles (11) and a plurality of electronic air valves (12) respectively corresponding to the plurality of air nozzles (11); the air nozzles (11) respectively correspond to the magnets (5), and each air nozzle (11) blows air towards the corresponding magnet (5) so as to increase the deviation of the neodymium iron boron magnetic powder in the corresponding particle size range; each electronic air valve (12) is arranged on the corresponding air nozzle (11) and is used for adjusting the air inflow of the corresponding air nozzle (11);

the controller is also used for inquiring a preset corresponding relation between the particle size and the air inflow according to the data in a data 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 (11) through each electronic air valve (12); and the particle size range and the air inflow have one-to-one corresponding data correspondence in a particle size-air inflow comparison table.

4. The automatic sieving device for neodymium iron boron magnetic powder according to claim 1, characterized in that the cutting assembly comprises a cutting knife (13) in a spiral shape; the cutting knife (13) is arranged on the inner wall of the rotary cylinder (3), and the central axis is superposed with the central line of the rotary cylinder (3).

5. The automatic sieving device for neodymium iron boron magnetic powder according to claim 1, characterized in that the driving assembly comprises a driving motor (14), a first gear (15) and a second gear (16); the driving motor (14) is arranged on the screening barrel (1), and the rotating shaft is parallel to the central line of the rotating barrel (3); the first gear (15) is arranged on an output shaft of the driving motor (14) and is meshed with the second gear (16); the second gear (16) is installed on the rotary drum (3) and is arranged coaxially with the rotary drum (3).

6. The automatic sieving device for neodymium iron boron magnetic powder according to claim 1, characterized in that the first telescopic component comprises a first electric telescopic piece (17) and a first baffle plate (18); the first electric telescopic part (17) is arranged on the bottom wall of the screening barrel (1); the first baffle (18) is fixed on the telescopic end of the first electric telescopic part (17), and the first discharge hole (9) is opened or closed when the first electric telescopic part (17) is telescopic;

each telescopic assembly II comprises an electric telescopic piece II (19) and a baffle II (20); the second electric telescopic piece (19) is arranged on the bottom wall of the screening barrel (1); the second baffle (20) is fixed on the telescopic end of the second electric telescopic piece (19), and the second discharge hole (10) is opened or closed when the second electric telescopic piece (19) is telescopic.

7. The automatic sieving device for neodymium iron boron magnetic powder according to claim 1, characterized in that the detecting mechanism comprises a first infrared sensor (21) and a plurality of second infrared sensors (22) respectively corresponding to a plurality of second collecting barrels (8); 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 arranged oppositely; the emitter and the receiver of each infrared sensor II (22) are arranged on the inner wall of the corresponding collecting barrel II (8) and are arranged oppositely; when the collection amount of the neodymium iron boron magnetic powder in the first collection barrel (6) exceeds the preset magnetic powder amount, a light 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 driving the first telescopic assembly by the controller; the volume of collecting of neodymium iron boron magnetic powder in collecting vessel two (8) surpasses when predetermineeing magnetic powder volume two, the transmitter and the receiver of two (22) of infrared sensor that correspond are by neodymium iron boron magnetic powder interdiction makes two (22) of infrared sensor that correspond produce the confession a triggering signal two of the flexible subassembly two that the controller drive corresponds.

8. The automatic sieving device for neodymium iron boron magnetic powder according to claim 1, characterized in that the detection mechanism comprises a first weighing sensor and a plurality of second weighing sensors respectively corresponding to a plurality of second collecting barrels (8); the first weighing sensor is arranged in the screening barrel (1) and used for detecting the weight of the neodymium iron boron magnetic powder in the first collecting barrel (6); the second weighing sensor is arranged in the screening barrel (1) and used for detecting the weight of the neodymium iron boron magnetic powder in the corresponding second collecting barrel (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 assembly to extend out; when the weight of the neodymium iron boron magnetic powder in the second collecting barrel (8) exceeds the second preset weight, the second telescopic assembly corresponding to the controller is driven to extend.

9. The automatic sieving device of neodymium iron boron magnetic powder according to claim 1, characterized in that the automatic sieving device further comprises:

at least one layer of screen mesh (23) installed in the screening barrel (1) and located between the rotary cylinder (3) and the magnet (5) located at the topmost layer.

10. An automatic sieving method of neodymium iron boron magnetic powder, which is applied to the automatic sieving device of neodymium iron boron magnetic powder according to any one of claims 1 to 9, is characterized by comprising the following steps:

measuring the specific gravity of the blocky powder cluster in the unit volume of the neodymium iron boron magnetic powder in the feeding pipe (2);

detecting the collection amount of the neodymium iron boron magnetic powder in the first collection barrel (6) and the second collection barrel (8);

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 rotary drum (3) through the driving assembly; wherein, the proportion and the rotating speed have one-to-one corresponding data corresponding relation in the proportion-rotating speed comparison table;

when the collection amount of the neodymium iron boron magnetic powder in the collection barrel I (6) exceeds a preset magnetic powder amount, driving the telescopic assembly I to extend out to open the discharge port I (9), and driving the telescopic assembly I to contract after a preset time I is reached to close the discharge port I (9);

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, the corresponding second telescopic assembly is driven to extend out, so that the corresponding second discharge port (10) is opened, and the corresponding second telescopic assembly is driven to contract after a preset time II is reached, so that the corresponding second discharge port (10) is closed.

Technical Field

The invention relates to a screening device in the technical field of screening, in particular to an automatic neodymium iron boron magnetic powder screening device and an automatic neodymium iron boron magnetic powder screening method of the device.

Background

The neodymium-iron-boron magnet is a tetragonal crystal formed of neodymium, iron, and boron. This magnet is a permanent magnet that is second only to absolute zero holmium magnets in magnetism today and is also the most commonly used rare earth magnet. Neodymium iron boron magnets are widely used in electronic products such as hard disks, mobile phones, earphones, and battery powered tools. The neodymium iron boron is divided into sintered neodymium iron boron and bonded neodymium iron boron, and the bonded neodymium iron boron is magnetic in all directions and is corrosion-resistant; the sintered neodymium iron boron is easy to corrode, and the surface of the sintered neodymium iron boron needs to be plated with zinc, nickel, environment-friendly zinc, environment-friendly nickel, nickel copper nickel, environment-friendly nickel copper nickel and the like. The sintered neodymium iron boron is generally divided into axial magnetization and radial magnetization according to the required working surface.

In neodymium iron boron permanent magnet material production process, need sieve the magnetic, do so firstly in order to sieve out the impurity in the magnetic, secondly in order to separate the thickness powder of magnetic, avoid the magnetic thickness to influence stability and magnetism that the later stage was used differently, this just needs to use screening plant. However, the screening effect of the existing neodymium iron boron magnetic powder screening device is poor, and the screen is easy to stack and block in the screening process, so that the screening efficiency is low.

Disclosure of Invention

The invention provides an automatic neodymium iron boron magnetic powder screening device and an automatic screening method thereof, and aims to solve the technical problems that an existing neodymium iron boron magnetic powder screening device is poor in screening effect and low in screening efficiency.

The invention is realized by adopting the following technical scheme: the utility model provides an automatic screening plant of neodymium iron boron magnetic, it includes:

a screening barrel;

the dispersing mechanism comprises a feeding pipe, a rotating cylinder, a cutting assembly and a driving assembly; 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 cylinder, and the feeding pipe is used for conveying the neodymium iron boron magnetic powder into the rotary cylinder; 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 is positioned at the opposite side of the inner space of the screening barrel; the cutting assembly is fixed in the rotary cylinder and can cut blocky powder lumps in the neodymium iron boron magnetic powder falling from the feeding pipe; the driving assembly is used for driving the rotary drum to rotate relative to the screening barrel, so that the cutting assembly rotates along with the rotary drum to cut the blocky powder dough into pieces;

a biasing mechanism including a guard plate and a plurality of magnets; the protection plate is positioned on the opposite side of the internal space of the screening barrel, is parallel to the inner wall of the screening barrel and is provided with a gap; the magnets are sequentially distributed in the gap from top to bottom, and the distances between the magnets and the center line of the rotary cylinder are the same; the magnetism of the magnets is weakened from top to bottom in sequence and corresponds to the neodymium iron boron magnetic powder in a plurality of particle size ranges one by one; the magnetic field generated by each magnet can cover a falling space below the rotary cylinder, so that the neodymium iron boron magnetic powder in the corresponding particle size range can transversely generate corresponding offset under the action of magnetic attraction force;

the collecting mechanism comprises a first collecting barrel, a first telescopic component, a plurality of second collecting barrels and a plurality of second telescopic components which correspond to the second collecting barrels respectively; the first collecting barrel is arranged on the bottom wall of the screening barrel and is positioned below the rotary barrel; the bottom end of the first collecting barrel is provided with a first discharge hole, and the inner diameter of the first collecting barrel is larger than that of the rotary barrel; the first telescopic assembly is mounted on the bottom wall of the screening barrel and can be used for opening or closing the first discharge hole through telescoping; the plurality of second collecting barrels correspond to the plurality of magnets respectively, and 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 discharging port; the second telescopic assembly is mounted on the bottom wall of the screening barrel and can be stretched to open or close the corresponding second discharge hole;

the detection mechanism is used for detecting the collection amount of the neodymium iron boron magnetic powder in the first collection barrel and the second collection barrel;

the controller is used for referring to a preset data corresponding relation in a proportion-rotating speed comparison table according to the proportion of the blocky powder lumps in the unit volume of the neodymium iron boron magnetic powder and adjusting the rotating speed of the rotating cylinder through the driving assembly; the proportion and the rotating speed have one-to-one corresponding data correspondence in the proportion-rotating speed comparison table; the controller is also used for driving the first telescopic assembly to extend out when the collection amount of the neodymium iron boron magnetic powder in the first collection barrel exceeds a preset magnetic powder amount, so that the first discharge port is opened, and driving the first telescopic assembly to contract after a preset time is reached, so that the first discharge port is closed; the controller is also used for driving the corresponding second telescopic assembly to extend out when the collection amount of the neodymium iron boron magnetic powder in one of the second collecting barrels exceeds a preset magnetic powder amount, so that the corresponding second discharge port is opened, and driving the corresponding second telescopic assembly to contract after reaching a preset time of two, so that the corresponding second discharge port is closed.

The invention cuts the massive powder agglomerates in the rotary cylinder through the cutting component in the dispersing mechanism, 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 generates certain deviation according to the size of the particle diameter in the falling process, the deviation distance of the neodymium iron boron magnetic powder with smaller particle diameter is larger, so that the neodymium iron boron magnetic powder can be screened, the impurities can directly and vertically fall under the action of a magnetic field, so that the impurities in the magnetic powder can be screened out, the separation of the thick powder and the thin powder of the magnetic powder can be realized, finally the collecting barrels in the collecting mechanism can collect the impurities for a while, the plurality of collecting barrels can sequentially collect the neodymium iron boron magnetic powder with each particle diameter, in the collecting process, the detecting mechanism can detect the collection amount, so that the controller can control the opening and closing of the discharge port I or the discharge port II in real time, avoid collecting vessel one or collecting vessel two to spill over, and the controller can also be according to the content of cubic powder group, the rotational speed of the rotatory section of thick bamboo of control, both guaranteed the dispersion quality, also make the energy obtain make full use of, it is relatively poor to have solved current neodymium iron boron magnetic screening plant screening effect, the technical problem that screening efficiency is relatively low, neodymium iron boron magnetic screening efficiency and screening quality have been improved, and the screening in-process is full-automatic to go on, can carry out big batch screening, guarantee the technological effect of the screening effect of neodymium iron boron magnetic.

As a further improvement of the above scheme, the magnet is an electromagnet; the controller is also used for adjusting the magnetic force of each magnet by inquiring a preset corresponding relation of the particle diameter and the magnetic force according to the data in the table according to the particle diameter range of the neodymium iron boron magnetic powder; wherein, the particle size range and the magnetic force have one-to-one corresponding data correspondence in the particle size-magnetic force comparison table.

As a further improvement of the above solution, the offset mechanism further includes a plurality of air nozzles and a plurality of electronic air valves respectively corresponding to the plurality of air nozzles; the air nozzles respectively correspond to the magnets, and each air nozzle blows air towards the corresponding magnet so as to increase the deviation of the neodymium iron boron magnetic powder in the corresponding particle size range; 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 corresponding relation between the particle size and the air inflow according to the data in a data 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; and the particle size range and the air inflow have one-to-one corresponding data correspondence in a particle size-air inflow comparison table.

As a further improvement of the above solution, the cutting assembly comprises a cutting knife in a spiral shape; the cutting knife is installed on the inner wall of the rotary cylinder, and the central axis coincides with the central line of the rotary cylinder.

As a further improvement of the above scheme, the driving assembly comprises a driving motor, a first gear and a second gear; the driving motor is arranged on the screening barrel, and the rotating shaft is parallel to the central line of the rotating barrel; the first gear is arranged on an output shaft of the driving motor and is meshed with the second gear; the second gear is installed on the rotary cylinder and is arranged coaxially with the rotary cylinder.

As a further improvement of the above scheme, the telescopic assembly comprises a first electric telescopic piece and a first baffle plate; the first electric telescopic piece is arranged on the bottom wall of the screening barrel; the first baffle is fixed on the telescopic end of the first electric telescopic piece, and the first discharge hole is opened or closed when the first electric telescopic piece is telescopic;

each telescopic assembly II comprises an electric telescopic piece II and a baffle II; the electric telescopic piece II is arranged on the bottom wall of the screening barrel; the second baffle is fixed at the telescopic end of the second electric telescopic piece, and the second discharge port is opened or closed when the second electric telescopic piece stretches.

As a further improvement of the above scheme, the detection mechanism comprises a first infrared sensor and a plurality of second infrared sensors respectively corresponding to the plurality of second collection barrels; a transmitter and a receiver of the first infrared sensor are arranged on the inner wall of the first collecting barrel and are arranged oppositely; the emitter and the receiver of each infrared sensor II are arranged on the inner wall of the corresponding collecting barrel II and are arranged oppositely; when the collection amount of the neodymium iron boron magnetic powder in the first collection barrel exceeds the preset magnetic powder amount, a light path between a transmitter and a receiver of the first infrared sensor is blocked 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; the collection volume of neodymium iron boron magnetic powder in collecting vessel two surpasses when predetermineeing magnetic powder volume two, the transmitter and the receiver of infrared sensor two that correspond are by neodymium iron boron magnetic powder interdiction makes two production confessions of infrared sensor that correspond a triggering signal two of the flexible subassembly two that the controller drive corresponds.

As a further improvement of the above scheme, the detection mechanism comprises a first weighing sensor and a plurality of second weighing sensors respectively corresponding to the plurality of second collecting barrels; the first weighing sensor is arranged in the screening barrel and used for detecting the weight of the neodymium iron boron magnetic powder in the first collecting barrel; the second weighing sensor is arranged in the screening barrel and used for detecting the weight of the neodymium iron boron magnetic powder in the corresponding second collecting barrel; when the weight of the neodymium iron boron magnetic powder in the first collecting barrel exceeds a preset weight, the controller drives the first telescopic assembly to extend out; when the weight of the neodymium iron boron magnetic powder in the second collecting barrel exceeds the second preset weight, the second telescopic assembly corresponding to the controller is driven to extend.

As a further improvement of the above solution, the automatic sieving apparatus further comprises:

and at least one layer of screen installed in the screening barrel and located between the rotary drum and the magnet located at the topmost layer.

The invention also provides an automatic neodymium iron boron magnetic powder screening method, which is applied to any of the automatic neodymium iron boron magnetic powder screening devices and comprises the following steps:

measuring the specific gravity of the blocky powder cluster in the unit volume of the neodymium iron boron magnetic powder in the feeding pipe;

detecting the collection amount of the neodymium iron boron magnetic powder in the first collection barrel and the second collection barrel;

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 rotary drum through the driving assembly; wherein, the proportion and the rotating speed have one-to-one corresponding data corresponding relation in the proportion-rotating speed comparison table;

when the collection amount of the neodymium iron boron magnetic powder in the first collection barrel exceeds a preset magnetic powder amount, driving the first telescopic assembly to extend out to open the first discharge port, and driving the first telescopic assembly to contract after a preset time is reached to close the first discharge port;

when the collection amount of the neodymium iron boron magnetic powder in one of the second collection barrels exceeds a preset magnetic powder amount II, the corresponding second telescopic assemblies are driven to extend out, so that the corresponding second discharge ports are opened, and the corresponding second telescopic assemblies are driven to contract after a preset time II is reached, so that the corresponding second discharge ports are closed.

Compared with the prior art, the automatic neodymium iron boron magnetic powder screening device and the automatic neodymium iron boron magnetic powder screening method have the following beneficial effects:

1. this automatic screening plant of neodymium iron boron magnetic, it cuts up through the cubic powder group cutting of dispersion mechanism in with the neodymium iron boron magnetic, with the abundant dispersion, then sieve the neodymium iron boron magnetic after the dispersion through skew mechanism, the neodymium iron boron magnetic of different particle diameters can produce without the skew, the mechanism that gathers materials at last collects according to the difference of neodymium iron boron magnetic particle diameter, and impurity can directly be collected alone, so both realized sieving out the impurity in the magnetic, the thickness powder separation with the magnetic has also been realized, and then improve the screening efficiency of neodymium iron boron magnetic, and cut up the neodymium iron boron magnetic of caking, thereby improve the screening effect, guarantee the screening quality of neodymium iron boron magnetic. Wherein, because drive assembly's drive effect can produce relative rotation between dispersion mechanism's pan feeding pipe and the rotatory section of thick bamboo, can be cut by cutting assembly at the in-process that neodymium iron boron magnetic powder falls into a rotatory section of thick bamboo from the pan feeding pipe like this for cubic powder group is fully minced, and then plays the effect of dispersion. The polylith magnet of skew mechanism can produce the magnetic field, and the neodymium iron boron magnetic of different particle diameters is because weight is different, its magnetism effort that receives is also different, and then the produced lateral deviation of whereabouts in-process in the screening bucket also can be different, neodymium iron boron magnetic in same particle diameter within range produces similar lateral deviation, and fall to same region, thereby realize the automatic screening to neodymium iron boron magnetic, and whole in-process does not use the screen cloth to sieve, can not produce the possibility that neodymium iron boron magnetic blockked up the screen cloth, therefore need not carry out manual maintenance, thereby improve screening efficiency. The collecting barrel I of the collecting mechanism can collect impurities which do not produce deviation in the falling process, and the collecting barrels II can collect the neodymium iron boron magnetic powder with different particle sizes according to different deviation of the neodymium iron boron magnetic powder, so that the neodymium iron boron magnetic powder can be screened and collected.

2. This automatic sieving mechanism of neodymium iron boron magnetic, its controller is according to the collection volume of the neodymium iron boron magnetic that detection mechanism detected, the collection volume of the neodymium iron boron magnetic in collecting vessel one surpasss and predetermines magnetic volume for a short time, order about discharge gate one and open the impurity of screening out with the output, and the collection volume of the neodymium iron boron magnetic in arbitrary one collecting vessel two surpasss when predetermineeing magnetic volume two, then order about discharge gate two and open the magnetic of screening out with the output, can avoid piling up too much and mixing into each other because impurity or magnetic at the in-process of screening like this, guarantee the purity of the magnetic of screening out. Moreover, the controller can also adjust the rotational speed of a rotatory section of thick bamboo according to the shared proportion of cubic powder group in unit volume's neodymium iron boron magnetic powder, can guarantee basic dispersion demand on the one hand like this, can also prevent the damage of excessive cutting to the neodymium iron boron magnetic powder, improves the utilization ratio of the energy simultaneously.

3. This automatic sieving mechanism of neodymium iron boron magnetic powder, the electro-magnet can be chooseed for use to its magnet of skew mechanism, and the controller can be according to the particle size range of neodymium iron boron magnetic powder, acquire the required magnetic force of each piece magnet through the inquiry, thereby adjust each piece magnet, like this neodymium iron boron magnetic powder can skew according to the magnetic force size, thereby can acquire the magnetic of various particle size ranges, just so can sieve according to the demand in practical application in order to acquire the magnetic of required particle size, the screening to neodymium iron boron magnetic powder is convenient greatly, can satisfy the screening application demand of various particle sizes. 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 further squint to the neodymium iron boron magnetic powder to reinforcing skew mechanism's skew effect, especially when the magnetic force of magnet is not enough to attract the neodymium iron boron magnetic powder of big particle diameter, the production of skew can be guaranteed to the tuyere. The controller can be according to corresponding data corresponding relation, controls the air input through the electron pneumatic valve, avoids the big amount of wind to cause adverse effect to screening, simultaneously, can make different tuyeres blow off the wind of different amount of wind according to the demand for the less magnetic of partly particle diameter can squint in advance, and the great magnetic of another part particle diameter then can squint one step later, can guarantee the effect of skew screening like this.

Drawings

Fig. 1 is a schematic structural diagram of an automatic neodymium iron boron magnetic powder screening device according to embodiment 1 of the present invention;

FIG. 2 is an enlarged view of area A of FIG. 1;

FIG. 3 is an enlarged view of area B of FIG. 1;

FIG. 4 is an external view of the neodymium iron boron magnetic powder automatic sieving device in FIG. 1;

FIG. 5 is an enlarged view of area C of FIG. 4;

fig. 6 is a schematic structural view of an automatic neodymium iron boron magnetic powder screening device according to embodiment 3 of the present invention;

fig. 7 is a schematic structural diagram of an automatic neodymium iron boron magnetic powder screening device according to embodiment 4 of the present invention;

fig. 8 is a schematic structural view of an automatic neodymium iron boron magnetic powder screening device according to embodiment 5 of the present invention.

Description of the symbols:

1 sieving barrel 13 cutter

2 feeding pipe 14 driving motor

3 rotating drum 15 Gear one

4 protective plate 16 gear II

5 magnet 17 electric expansion piece 1

6 collecting barrel one 18 baffle one

8 second collecting barrel and 19 second electric telescopic piece

9 discharge hole I20 baffle II

10 discharge port two 21 infrared sensor one

11 tuyere 22 infrared sensor II

12 electronic air valve 23 screen mesh

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.