CN112024087A - A jet mill device for NdFeB production - Google Patents

Abstract

The invention discloses an airflow mill device for neodymium iron boron production, which comprises a device main body, a hopper and a double-screw feeder. The top embedding of device main part is connected with the hopper, inside one side swing joint of device main part has double helix feeder, inside one side swing joint of double helix feeder has pneumatic strike hammer, double helix feeder's one end fixedly connected with converter, double helix feeder's opposite side overlap joint links to each other has the check weighing automatic feed valve, the bottom fixedly connected with integrated electric control cabinet of device main part, the fine wholeness that embodies the device of integrated electric control cabinet, the fine convenience of accomodating of embodying the device of groove is accomodate to the part, the fine grinding high efficiency that embodies the device of high-efficient grinding mechanism, the fine cyclicity that embodies the device of filtration circulation mechanism, grind the fine stability and the controllability that embodies the device of steady voltage cooling body, be applicable to neodymium iron boron production technical field's use, future extensive development prospect has.

Description

A jet mill device for NdFeB production

technical field

The invention belongs to the technical field of NdFeB production, in particular to a jet mill device for NdFeB production.

Background technique

Jet mill is mostly used in NdFeB powder milling and other processes that require milling.

The existing grinding device has large grinding particles, does not have a secondary grinding design, and the grinding effect is poor. Since gas will be discharged after grinding, and the gas will be wasted directly if the gas is discharged directly. The existing device does not have a good recycling design. Because the grinding pressure in the grinding machine is stable, the particle size of the ground powder is stable, and the existing device cannot control the air pressure stably, and the particle size of the powder is not stable enough.

SUMMARY OF THE INVENTION

The object of the present invention is: in order to solve the problem (the grinding effect proposed in the above-mentioned background technology is poor, does not have a good recycling design and the particle size of the powder is not stable enough), a kind of air flow for NdFeB production is provided. grinding device.

The technical scheme adopted in the present invention is as follows: a jet mill device for NdFeB production, comprising a device main body, a hopper and a double screw feeder, the top of the device main body is embedded with a hopper, and the inside of the device main body is connected A double screw feeder is movably connected on one side;

The bottom of one side of the main body of the device is overlapped and connected with a grinding layer, the inner bottom of the grinding layer is fixedly connected with a nozzle, the top of the grinding layer is fixedly connected with a sorting layer, and the inner side of the sorting layer is movable A sorting wheel is connected, the bottom side of the sorting layer is fixedly connected with a secondary grinding port, one side of the sorting layer is overlapped and connected with a separator, and the bottom side of the separator is fixedly connected with a device. barrel;

A filter is fixedly connected to the middle part of the bottom of the separator, a pulse cleaning device is fixedly connected to one side of the inner top of the filter, and one side of the pulse cleaning device is lapped and connected with micropores. One side of the inner bottom is fixedly connected with an automatic oxygen exhaust valve, and the other side of the inner bottom of the filter is fixedly connected with a mechanical oxygen exhaust valve;

The bottom side of the filter is lapped and connected with a compressor, the top of one side of the compressor is lapped and connected with a refrigeration dryer, and a cooling water inlet and outlet is fixedly connected to the inner side of the refrigeration dryer. The top of the dryer is fixedly connected with a pneumatic membrane cut-off valve, one side of the pneumatic membrane cut-off valve is lapped and connected with a small regulating valve, and one side of the small regulating valve is lapped and connected with a large regulating valve, and the large regulating valve is lapped and connected. A low-pressure tank is fixedly connected to the bottom of the .

Preferably, a pneumatic percussion hammer is movably connected to an inner side of the double screw feeder.

Preferably, a frequency converter is fixedly connected to one end of the double screw feeder.

Preferably, the other side of the double-screw feeder is lapped and connected with a weighing automatic feeding valve.

Preferably, an integrated electrical control cabinet is fixedly connected to the bottom end of the device main body.

Preferably, a part receiving groove is fixedly connected to the bottom side of the device main body.

Preferably, the grinding layer at the bottom of the main body of the device, the nozzle at the bottom of the grinding layer, the sorting layer on the top of the grinding layer, the sorting wheel on the inner side of the sorting layer, and the secondary grinding on the bottom side of the sorting layer The separator on the side of the separation layer and the charging cylinder on the bottom side of the separator together form a high-efficiency grinding mechanism.

Preferably, the filter in the middle part of the bottom of the separator, the pulse cleaning device on the top side of the filter, the micropores on one side of the pulse cleaning device, the automatic oxygen exhaust valve on the bottom side of the filter and the bottom of the filter The mechanical oxygen exhaust valve on the other side together constitutes a filter circulation mechanism.

Preferably, the compressor on the bottom side of the filter, the refrigerating machine on the top side of the compressor, the cooling water inlet and outlet on the inner side of the refrigerating machine, the pneumatic film cut-off valve on the top of the refrigerating machine, the pneumatic film cut-off valve The small regulating valve on the side, the large regulating valve on one side of the small regulating valve and the low pressure tank at the bottom of the large regulating valve together form a grinding and pressure-stabilizing cooling mechanism.

To sum up, due to the adoption of the above-mentioned technical solutions, the beneficial effects of the present invention are:

1. In the present invention, by setting the high-efficiency grinding mechanism, the material enters the grinding layer through the feeding mechanism, and the high-pressure nitrogen provided by the compressor enters the grinding machine through the pressure regulating mechanism and the refrigerating machine. It is sprayed into the grinder at supersonic speed, the material is accelerated with the gas to form a fluidized bed, the material collides in the fluidized bed and becomes thinner, sprayed at the bottom, and the crushed powder is blown to the sorting layer, and the motor drives the sorting The wheel separates the fine powder, and enters the separator from the side of the discharge cylinder. The coarse powder slides back from the wall to the secondary grinding port and continues to grind until it is separated. The mixture of airflow and powder rotates in the separator to generate centrifugal force. The powder is thrown out and loaded into the barrel through the discharge valve, so that the grinding of the material is efficiently and automatically completed, which well reflects the grinding efficiency of the device;

2. In the present invention, by setting up a filtration and circulation mechanism, the separated gas enters the filter through the pipeline, and the pulse cleaning device in the filter generates a pulsed air flow, and the backflushing makes the fine powder discharged from the micropores, so that the air flow is kept smooth and filtered. The rear end of the compressor is connected with a mechanical oxygen exhaust valve and an automatic oxygen exhaust valve. When the oxygen content is high, the system automatically exhausts and replenishes nitrogen. The treated gas can directly enter the compressor for recycling, which is a good reflection of the Circularity of the device;

3. In the present invention, by setting up a grinding and pressure-stabilizing cooling mechanism, the temperature of the gas after being compressed by the compressor is very high, and it needs to be cooled. The gas can be well cooled and dried, then install a small regulating valve and a large regulating valve on the bypass line, and use a low-pressure tank to control the large regulating valve. The valve fully open system performs a small cycle, and the air supply valve is fully opened to supply air to the system to the maximum extent. The small regulating valve is used to adjust the grinding pressure to make the grinding pressure more stable. At the same time, a pneumatic film is installed between the outlet of the dryer and the mill The shut-off valve can quickly cut off the gas from the mill when the pressure is unstable, which well reflects the stability and controllability of the device.

4. In the present invention, a pneumatic percussion hammer is movably connected to the inner side of the double-screw feeder. Since part of the material with moisture is easy to stick to the inner wall of the hopper and cannot fall down during feeding, it is easy to cause blockage. By setting the pneumatic percussion hammer The hammer, the pneumatic hammer is set inside the hopper, driven by the air pump, it can knock the inner wall of the hopper, so as to prevent the material from sticking to the inner wall of the hopper. One end of the double screw feeder is fixedly connected with a frequency converter , Due to the different requirements for the feeding rate in different situations, most of the existing feeders have a fixed feeding rate, which cannot be well adjusted. By setting the frequency converter, the frequency converter is a variable resistance structure, and by changing the resistance of the feeder The value in turn changes the output power of the feeder, thereby achieving the effect of changing the feeding rate.

5. In the present invention, the other side of the double-screw feeder is lapped and connected with an automatic weighing feeding valve. The existing device needs to manually judge whether the feeding is full, which is more troublesome. By setting the weighing automatic feeding valve, the weighing The instrument measures the weight of the material in the mill through the sensor, and uses the feeding system to keep the material in the mill within a certain range, so that no manual participation is required, which well reflects the automation of the device. The bottom end of the main body of the device is fixedly connected with Integrated electric control cabinet, the existing device control elements are scattered everywhere, which is not convenient for staff to control. By setting up an integrated electric control cabinet, the integrated electric control cabinet is the electric control center of the device. The panel is equipped with a touch screen, an oxygen content analyzer, a measuring instrument, and a touch screen. Relevant electrical components such as heavy meters can centrally and uniformly control related components, which well reflects the integrity of the device.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the enlarged schematic diagram of A place of the present invention;

Fig. 3 is the enlarged schematic diagram of B place of the present invention;

Markings in the figure: 1. Main body of the device, 2. Hopper, 3. Double screw feeder, 4. Pneumatic hammer, 5. Frequency converter, 6. Automatic weighing valve, 7. Grinding layer, 8. Nozzle, 9. Sorting layer, 10, Sorting wheel, 11, Secondary grinding port, 12, Separator, 13, Charging cylinder, 14, Filter, 15, Pulse cleaning device, 16, Micropore, 17, Automatic discharge Oxygen valve, 18, Mechanical oxygen exhaust valve, 19, Compressor, 20, Cold dryer, 21, Cooling water inlet and outlet, 22, Pneumatic film cut-off valve, 23, Small regulating valve, 24, Large regulating valve, 25, Low pressure tank , 26, integrated electrical control cabinet, 27, parts storage slot.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention; the terms "first", "second", "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise Clearly stipulated and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or a Electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Please refer to Figures 1-3, the present invention provides a technical solution: a jet mill device for NdFeB production, comprising a device main body 1, a hopper 2 and a double screw feeder 3, the top of the device main body 1 is embedded and connected There is a hopper 2, and a double screw feeder 3 is movably connected to the inner side of the main body 1 of the device;

The bottom of one side of the main body 1 of the device is lapped and connected with a grinding layer 7, the inner bottom of the grinding layer 7 is fixedly connected with a nozzle 8, the top of the grinding layer 7 is fixedly connected with a sorting layer 9, and the inner side of the sorting layer 9 is movably connected There is a sorting wheel 10, the bottom side of the sorting layer 9 is fixedly connected with a secondary grinding port 11, one side of the sorting layer 9 is overlapped and connected with a separator 12, and the bottom side of the separator 12 is fixedly connected with a charging material. barrel 13;

A filter 14 is fixedly connected to the middle part of the bottom of the separator 12, a pulse cleaning device 15 is fixedly connected to one side of the inner top of the filter 14, and a micropore 16 is connected to one side of the pulse cleaning device 15. An automatic oxygen exhaust valve 17 is fixedly connected to one side of the bottom, and a mechanical oxygen exhaust valve 18 is fixedly connected to the other side of the inner bottom of the filter 14;

A compressor 19 is connected to the bottom side of the filter 14, and a refrigeration dryer 20 is connected to the top of one side of the compressor 19. The inner side of the refrigeration dryer 20 is fixedly connected with a cooling water inlet and outlet 21. The top of 20 is fixedly connected with a pneumatic membrane cut-off valve 22, one side of the pneumatic membrane cut-off valve 22 is lapped and connected with a small regulating valve 23, one side of the small regulating valve 23 is lapped and connected with a large regulating valve 24, and the large regulating valve 24 is lapped and connected. A low-pressure tank 25 is fixedly connected to the bottom.

Preferably, a pneumatic percussion hammer 4 is movably connected to the inner side of the double screw feeder 3. Since some materials with water sticking to the inner wall of the hopper are easy to stick to the inner wall of the hopper and cannot fall down during feeding, it is easy to cause blockage. Hammer 4, Pneumatic Percussion Hammer 4 is arranged inside the hopper, and driven by the air pump, it can knock the inner wall of the hopper, so as to prevent the material from sticking to the inner wall of the hopper.

Preferably, a frequency converter 5 is fixedly connected to one end of the double screw feeder 3. Due to the different requirements for the feeding rate in different situations, most of the existing feeders have a fixed feeding rate, which cannot be well adjusted. Frequency converter 5, frequency converter 5 is a variable resistance structure, by changing the resistance value of the feeder to change the output power of the feeder, so as to achieve the effect of changing the feeding rate.

Preferably, the other side of the double-screw feeder 3 is overlapped and connected with a weighing automatic feeding valve 6. The existing device needs to manually judge whether the feeding is full, which is relatively troublesome. By setting the weighing automatic feeding valve 6, the weighing The instrument measures the weight of the material in the mill through the sensor, and uses the feeding system to keep the material in the mill within a certain range, so that no manual participation is required, which well reflects the automation of the device.

Preferably, an integrated electrical control cabinet 26 is fixedly connected to the bottom end of the main body 1 of the device. The existing device control elements are scattered around, which is inconvenient for staff to control. Control center, the panel is provided with touch screen, oxygen content analyzer, weight meter and other related electrical components, which can centrally and uniformly control related components, which well reflects the integrity of the device.

Preferably, a part storage slot 9 is fixedly connected to the bottom side of the main body 1 of the device. When operating the device, related parts and tools need to be used. The parts and tools are easily stacked and lost when placed anywhere. By setting the parts storage slot 9. The parts storage slot 9 is a storage structure integrated with the device, and the staff can put the relevant tools into the parts storage slot 9 for temporary storage, which well reflects the storage convenience of the device.

Preferably, the grinding layer 7 at the bottom of the device main body 1, the nozzle 8 at the inner bottom of the grinding layer 7, the sorting layer 9 on the top of the grinding layer 7, the sorting wheel 10 on the inner side of the sorting layer 9, the sorting layer 9 The secondary grinding port 11 on the bottom side, the separator 12 on the side of the sorting layer 9 and the charging cylinder 13 on the bottom side of the separator 12 together form a high-efficiency grinding mechanism. The secondary grinding design has poor grinding effect. By setting this high-efficiency grinding mechanism, the material enters the grinding layer 7 through the feeding mechanism, and the high-pressure nitrogen provided by the compressor enters the grinding machine through the pressure regulating mechanism and the refrigerating machine. The nozzle 8 makes Gas acceleration, high-pressure nitrogen is injected into the mill at supersonic speed, the material is accelerated with the gas to form a fluidized bed, the material collides in the fluidized bed and becomes thinner, sprayed at the bottom, and 8 blows the crushed powder to the centrifuge. Selecting layer 9, the motor drives the sorting wheel 10 to separate the fine powder, and enters the separator 12 from the side of the discharge cylinder. The coarse powder slides back from the wall to the secondary grinding port 11 and continues to grind until it is separated. The mixture is rotated in the separator 12 to generate centrifugal force, and the powder is thrown out and loaded into the barrel 13 through the discharge valve, thereby efficiently and automatically completing the grinding of the material, which well reflects the grinding efficiency of the device.

Preferably, the filter 14 in the middle part of the bottom of the separator 12, the pulse cleaning device 15 on the top side of the filter 14, the micropores 16 on one side of the pulse cleaning device 15, and the automatic oxygen exhaust valve on the bottom side of the filter 14 17 and the mechanical oxygen exhaust valve 18 on the other side of the inner bottom of the filter 14 together form a filtration and circulation mechanism. Since the gas will be discharged after grinding, and the direct discharge of the gas will cause waste, and the existing device does not have a good recycling design. By setting the filtration circulation mechanism, the separated gas enters the filter 14 through the pipeline, the pulse cleaning device 15 in the filter 14 generates a pulsed air flow, and the back blow makes the fine powder discharged from the micropores 16 to keep the air flow unobstructed, and the filter 14 The rear end is connected with a mechanical oxygen exhaust valve 18 and an automatic oxygen exhaust valve 17. When the oxygen content is high, the system automatically exhausts and replenishes nitrogen, and the treated gas can directly enter the compressor 19 for recycling, so that the It reflects the circularity of the device.

Preferably, the compressor 19 on the bottom side of the filter 14, the refrigerating machine 20 on the top side of the compressor 19, the cooling water inlet and outlet 21 on the inner side of the refrigerating machine 20, and the pneumatic film cut-off valve 22 on the top of the refrigerating machine 20 , the small regulating valve 23 on the side of the pneumatic film cut-off valve 22, the large regulating valve 24 on the side of the small regulating valve 23 and the low-pressure tank 25 at the bottom of the large regulating valve 24 together form a grinding stabilization cooling mechanism, due to the grinding pressure in the grinding machine Stable, the particle size of the milled powder will be stable. The existing device cannot control the air pressure stably, and the particle size of the powder is not stable enough. By setting the grinding pressure-stabilizing cooling mechanism, the temperature of the gas after being compressed by the compressor is very high, which needs to be carried out. Cooling, by setting the refrigerating machine 20, inject cooling water into the cooling water inlet and outlet 21 during cooling, and the gas passing through the refrigerating machine 20 can be well cooled and dried, and then install a small regulating valve 23 and a large regulating valve on the bypass line. Valve 24, use the low pressure tank 25 to control the large regulating valve 24. When the compressor 19 is just turned on, the low pressure and 25 pressure are very low. At this time, the large regulating valve 24 is fully opened and the system performs a small cycle, and the air supply valve is fully opened to the maximum extent. Supply air to the system, and the small regulating valve 23 is used to adjust the grinding pressure to make the grinding pressure more stable. At the same time, a pneumatic film cut-off valve 22 is installed between the outlet of the refrigerating machine 20 and the grinding machine, which can quickly cut off the grinding machine when the pressure is unstable. gas, which well reflects the stability and controllability of the device.

Working principle: First of all, by setting the integrated electric control cabinet 26, the integrated electric control cabinet 26 is the electric control center of the device, and the panel is provided with related electrical components such as touch screen, oxygen content analyzer, weight meter, etc. Centralized and unified control, which well reflects the integrity of the device;

Then, by setting the parts storage slot 9, the parts storage slot 9 is a storage structure integrated with the device, and the staff can put the relevant tools into the parts storage slot 9 for temporary storage, which well reflects the storage convenience of the device. ;

Next, by setting the high-efficiency grinding mechanism, the material enters the grinding layer 7 through the feeding mechanism, the high-pressure nitrogen provided by the compressor enters the grinding machine through the pressure regulating mechanism and the refrigerating machine, and the nozzle 8 accelerates the gas, and the high-pressure nitrogen is supercharged. The speed of sound is injected into the grinder, the material is accelerated with the gas to form a fluidized bed, the material collides in the fluidized bed and becomes thinner, the bottom spray, 8 blows the crushed powder to the sorting layer 9, the motor drives the sorting The wheel 10 separates the fine powder and enters the separator 12 from the side of the discharge cylinder. The coarse powder slides back from the wall to the secondary grinding port 11 and continues to grind until it is separated. The mixture of airflow and powder rotates in the separator 12. The centrifugal force is generated, the powder is thrown out, and the material is loaded into the barrel 13 through the discharge valve, so as to efficiently and automatically complete the grinding of the material, which well reflects the grinding efficiency of the device;

Then, by setting the filtration circulation mechanism, the separated gas enters the filter 14 through the pipeline, the pulse cleaning device 15 in the filter 14 generates a pulsed air flow, and the back blowing makes the fine powder discharged from the micropore 16, so that the air flow is kept smooth, The rear end of the filter 14 is connected with a mechanical oxygen exhaust valve 18 and an automatic oxygen exhaust valve 17. When the oxygen content is high, the system automatically exhausts and replenishes nitrogen, and the treated gas can directly enter the compressor 19 for recycling, thereby It well reflects the cyclicity of the device;

Finally, by setting up a grinding and pressure-stabilizing cooling mechanism, the temperature of the gas after being compressed by the compressor is very high, and it needs to be cooled down. By setting the refrigerating machine 20, cooling water is injected into the cooling water inlet and outlet 21 during cooling, and the gas passing through the refrigerating machine 20 Then the small regulating valve 23 and the large regulating valve 24 are installed on the bypass line, and the large regulating valve 24 is controlled by the low pressure tank 25. When the compressor 19 is just turned on, the pressure of the low pressure and 25 is very low. , At this time, the large regulating valve 24 is fully opened and the system performs a small cycle, and the air supply valve is fully opened to supply air to the system to the maximum extent, and the small regulating valve 23 is used to adjust the grinding pressure to make the grinding pressure more stable. A pneumatic film cut-off valve 22 is installed between the mills, which can quickly cut off the gas from the mill when the pressure is unstable, which well reflects the stability and controllability of the device. The working principle of the produced jet mill device.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (9)

1. A jet mill device for NdFeB production, comprising a device main body (1), a hopper (2) and a double screw feeder (3), characterized in that: the top of the device main body (1) is embedded A hopper (2) is connected, and a double screw feeder (3) is movably connected to the inner side of the device main body (1); A grinding layer (7) is overlapped and connected to the bottom of one side of the device main body (1), a nozzle (8) is fixedly connected to the inner bottom of the grinding layer (7), and a top of the grinding layer (7) is fixedly connected There is a sorting layer (9), the inner side of the sorting layer (9) is movably connected with a sorting wheel (10), and the bottom side of the sorting layer (9) is fixedly connected with a secondary grinding port ( 11), a separator (12) is lapped and connected to one side of the sorting layer (9), and a charging cylinder (13) is fixedly connected to the bottom side of the separator (12); A filter (14) is fixedly connected to the middle part of the bottom of the separator (12), and a pulse cleaning device (15) is fixedly connected to the inner top side of the filter (14). The pulse cleaning device (15) One side of the filter (14) is lapped and connected with micropores (16), one side of the inner bottom of the filter (14) is fixedly connected with an automatic oxygen exhaust valve (17), and the other side of the inner bottom of the filter (14) is fixed A mechanical oxygen exhaust valve (18) is connected; One side of the bottom of the filter (14) is overlapped with a compressor (19), and a top of one side of the compressor (19) is overlapped and connected with a refrigerating machine (20), and the refrigerating machine (20) A cooling water inlet (21) is fixedly connected to the inner side of the refrigerating machine (20), a pneumatic film cut-off valve (22) is fixedly connected to the top of the refrigerating machine (20), and one side of the pneumatic film cut-off valve (22) is overlapped. A small regulating valve (23) is connected, one side of the small regulating valve (23) is overlapped and connected with a large regulating valve (24), and a low pressure tank (25) is fixedly connected to the bottom of the large regulating valve (24). 2. A kind of jet mill device for NdFeB production according to claim 1, it is characterized in that: the inner side of described double screw feeder (3) is movably connected with pneumatic percussion hammer (4) . 3 . The jet mill for NdFeB production according to claim 1 , wherein a frequency converter ( 5 ) is fixedly connected to one end of the double screw feeder ( 3 ). 4 . 4. a kind of jet mill device for NdFeB production according to claim 1, is characterized in that: the other side of described double screw feeder (3) is lapped and connected with weighing automatic feeding valve ( 6). 5 . The jet mill device for NdFeB production according to claim 1 , wherein an integrated electric control cabinet ( 26 ) is fixedly connected to the bottom end of the device main body ( 1 ). 6 . 6. A jet mill device for NdFeB production according to claim 1, characterized in that: a part receiving groove (9) is fixedly connected to the bottom side of the device main body (1). 7. A kind of jet mill device for NdFeB production according to claim 1, characterized in that: the grinding layer (7) at the bottom of one side of the device main body (1), the inner bottom of the grinding layer (7) Nozzle (8), the sorting layer (9) on the top of the grinding layer (7), the sorting wheel (10) on the inner side of the sorting layer (9), the secondary grinding on the bottom side of the sorting layer (9) The mouth (11), the separator (12) on the side of the sorting layer (9) and the charging cylinder (13) on the bottom side of the separator (12) together form a high-efficiency grinding mechanism. 8. A kind of jet mill device for NdFeB production according to claim 1, it is characterized in that: the filter (14) in the middle part of the bottom of the separator (12), the inner top of the filter (14) The pulse cleaning device (15) on one side, the micropores (16) on one side of the pulse cleaning device (15), the automatic oxygen exhaust valve (17) on the inner bottom side of the filter (14) and the inner bottom of the filter (14) The mechanical oxygen exhaust valve (18) on the other side together constitutes a filter circulation mechanism. 9. A kind of jet mill device for NdFeB production according to claim 1, it is characterized in that: the compressor (19) on the bottom side of the filter (14), the compressor (19) side The refrigerating machine (20) on the top, the cooling water inlet and outlet (21) on the inner side of the refrigerating machine (20), the pneumatic film cut-off valve (22) on the top of the refrigerating machine (20), the pneumatic film cut-off valve (22) one The small regulating valve (23) on the side of the small regulating valve (23), the large regulating valve (24) on the side of the small regulating valve (23) and the low pressure tank (25) at the bottom of the large regulating valve (24) together form a grinding and stabilizing cooling mechanism.

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