Jet mill device

Abstract

The utility model provides a jet mill device, and relates to the technical field of magnet production. The jet mill device provided by the utility model comprises a jet mill body, the jet mill assembly is arranged in the jet mill body and is used for processing materials; the classifier is arranged in the jet mill body, communicates with the jet mill assembly and is used for screening materials; and the material output assembly comprises a pipe body and a separation protection part, and the inner wall of the pipe body is covered with the separation protection part. According to the material output assembly, the separation protection piece is arranged on the inner wall of the pipe body, so that the inner wall of the pipe body is separated from the materials, abrasion to the inner wall of the pipe body when the materials are discharged at a high speed is avoided, the service life of the material output assembly is prolonged, and the maintenance and replacement cost is reduced. And meanwhile, the phenomenon that the materials are adsorbed or accumulated on the inner wall of the pipe body in the conveying process to form oxide skin and cause blockage is relieved, the stability of the pressure in the jet mill body is conveniently maintained, and the granularity consistency of processed material powder is improved.

Description

Technical Field

[0001] This application relates to the technical field of magnet production, and particularly to an air classifier mill device. Background Art

[0002] Neodymium iron boron magnets are widely used in various motors due to their excellent magnetic properties. Among them, with the rapid development of new energy vehicles, the application of neodymium iron boron magnets in the drive motors of new energy vehicles has greatly improved the working efficiency of the drive motors. When preparing neodymium iron boron magnets, it is usually carried out according to the process of batching, melting, powder making, sintering, and aging treatment. Among them, the powder making process is usually completed by an air classifier mill, using high-pressure air flow to make the powders collide with each other and break. After reaching the appropriate particle size, the crushed particles pass through a classifier with the upward air flow for screening and separation.

[0003] The existing air classifier mill device directly uses seamless rubber hoses, which are prone to wear during use, have a short service life, require shutdown waiting during the process of replacing the rubber hoses, affecting production efficiency, and there is a risk of fire due to the accumulation of powders in the pipeline; in addition, due to the increase in the formation of oxide scales by the accumulation of powders inside the rubber hoses during use, the discharge pipeline is blocked, resulting in an increase in the pressure inside the grinding chamber of the air classifier mill, leading to poor stability of the powder particle size. Summary of the Utility Model

[0004] Based on this, this application provides an air classifier mill device, which reduces the wear of the pipeline by powders, increases the service life of the pipeline, and alleviates the problem of blockage of the discharge pipeline due to the increase in oxide scales of the discharge pipeline.

[0005] The air classifier mill device provided by this application includes:

[0006] An air classifier mill body;

[0007] An air classifier mill assembly, arranged inside the air classifier mill body of the material output assembly, for processing materials;

[0008] A classifier, arranged inside the air classifier mill body of the material output assembly and communicating with the air classifier mill assembly of the material output assembly, for screening the processed materials;

[0009] A material output assembly, and the material output assembly includes:

[0010] A pipe body, arranged on the air classifier mill body of the material output assembly and communicating with the classifier, for discharging the screened materials;

[0011] A partition protection member, covering the inner wall of the pipe body of the material output assembly.

[0012] Optionally, the classifier of the material output assembly includes:

[0013] The classification wheel is arranged inside the air classifier mill body of the material output component and is connected to the air classifier mill component of the material output component;

[0014] The driving motor is connected to the classification wheel of the material output component through a driving bearing to drive the classification wheel of the material output component to rotate.

[0015] Optionally, the air classifier mill device of the material output component further includes:

[0016] The cooling component, and the cooling component of the material output component includes:

[0017] The heat conduction part is arranged at least at one of the driving bearing of the material output component and the driving motor of the material output component;

[0018] The cooling water input part is arranged at one end of the heat conduction part of the material output component and is connected to the heat conduction part of the material output component, and is used for conveying cooling water into the interior of the heat conduction part of the material output component for heat exchange;

[0019] for heat exchange;

[0020] The drainage part is arranged at the other end of the heat conduction part of the material output component and is used for discharging the cooling water after heat exchange.

[0021] Optionally, the air classifier mill component includes:

[0022] The grinding chamber is arranged inside the air classifier mill body;

[0023] The feed inlet is connected to the grinding chamber and is used for inputting the material to be processed;

[0024] The nozzle is arranged at the lower end of the grinding chamber and is used for introducing high-pressure air into the grinding chamber.

[0025] Optionally, the separation and protection part is arranged on the inner wall of the pipe body through an adhesive.

[0026] Optionally, the adhesive is Chemlok glue.

[0027] Optionally, the inner wall of the pipe body is provided with an embedding groove, and the separation and protection part is embedded in the embedding groove.

[0028] Optionally, the outer shape of the separation and protection part is in a tile shape matching the inner wall of the pipe body.

[0029] Optionally, the separation and protection part includes at least one of alumina, zirconia, silicon carbide or silicon boride.

[0030] Optionally, the inner diameter of the pipe body is 150 - 160 mm.

[0031] The airflow mill device provided by the present application processes materials through the airflow mill assembly inside the airflow mill body, thereby performing the powder-making process. The processed materials are discharged from the material output assembly after being screened by the classifier. By arranging a separation protection member on the inner wall of the pipe body in the material output assembly, the inner wall of the pipe body is separated from the materials, avoiding abrasion of the inner wall of the pipe body caused by the high-speed discharge of the materials, so as to improve the service life of the material output assembly and reduce the maintenance and replacement costs. At the same time, it further reduces the phenomenon that the materials adsorb or accumulate on the inner wall of the pipe body during transportation to form scale, resulting in blockage. By reducing the blockage phenomenon of the material output assembly, it is convenient to maintain the stability of the internal pressure of the airflow mill body and improve the particle size consistency of the material powder after processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exceeding the scope protected by the present application.

[0033] Figure 1 is a schematic structural diagram of the airflow mill device provided by the present application;

[0034] Figure 2 is a schematic structural diagram of the material output assembly in the airflow mill device provided by the present application.

[0035] Description of the reference numerals: 1. Airflow mill body; 2. Airflow mill assembly; 21. Grinding chamber; 22. Feed inlet; 23. Nozzle; 3. Material output assembly; 31. Pipe body; 32. Separation protection member; 4. Classifier; 41. Classification wheel; 42. Driving motor; 43. Driving bearing; 100. Material. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] refer to Figure 1 and Figure 2 The jet mill device provided in the present application includes a jet mill body 1, a jet mill assembly 2, a classifier 4 and a material output assembly 3; the jet mill assembly 2 is arranged inside the jet mill body 1, and is used to process the material 100; the classifier 4 is arranged inside the jet mill body 1, and is connected to the jet mill assembly 2, and is used to screen the processed material 100; wherein the material output assembly 3 includes a pipe body 31 and a separation protection member 32. The pipe body 31 is arranged on the jet mill body 1, and is connected to the classifier 4, and is used to discharge the screened material 100; the separation protection member 32 is arranged on the inner wall of the pipe body 31.

[0040] The material 100 is processed by the airflow mill assembly 2 inside the airflow mill body 1, thereby performing a powder making process. The processed material 100 is discharged from the material output assembly 3 after being screened by the classifier 4. By setting a separation protection member 32 on the inner wall of the tube body 31 in the material output assembly 3, the inner wall of the tube body 31 is separated from the material 100, thereby preventing the material 100 from causing wear on the inner wall of the tube body 31 when discharged at a high speed, thereby increasing the service life of the material output assembly 3 and reducing the cost of maintenance and replacement. At the same time, it further reduces the phenomenon of the material 100 being adsorbed or accumulated on the inner wall of the tube body 31 during the transportation process to form oxide scale, causing blockage. By reducing the blockage of the material output assembly 3, it is convenient to maintain the stability of the internal pressure of the airflow mill body 1, and improve the particle size consistency of the powder of the material 100 after processing.

[0041] Reference Figure 1 As an optional implementation, the classifier 4 includes a classification wheel 41, a drive motor 42, and a drive bearing 43. Among them, the classification wheel 41 is disposed inside the air classifier mill body 1 and is communicated with the air classifier mill assembly 2; the drive motor 42 is connected to the classification wheel 41 through the drive bearing 43 to drive the classification wheel 41 to rotate.

[0042] When the classifier 4 screens the material 100, the drive motor 42 drives the classification wheel 41 to rotate at a high speed through the drive bearing 43, and the material 100 processed by the air classifier mill assembly 2 enters the classification wheel 41 for screening. The material 100 powder meeting the particle size requirements is transported to the material output assembly 3 for collection through the classification wheel 41, and the material 100 powder meeting the particle size requirements returns to the air classifier mill assembly 2 under the action of centrifugal force for further processing.

[0043] Reference Figure 1 As an optional implementation, the air classifier mill device further includes a cooling assembly (not shown in the figure), and the cooling assembly includes a heat conduction part, a cooling water input part, and a drainage part. Among them, the heat conduction part is disposed at least at one of the drive bearing 43 and the drive motor 42; the cooling water input part is disposed at one end of the heat conduction part and is communicated with the heat conduction part for transporting cooling water into the interior of the heat conduction part for heat exchange; the drainage part is disposed at the other end of the heat conduction part for discharging the cooling water after heat exchange.

[0044] The drive bearing 43 or the drive motor 42 of the classifier 4 is cooled by the cooling assembly, and at the same time, the temperature inside the classification wheel 41 is reduced. On the one hand, it can prevent the temperature of the drive bearing 43 or the drive motor 42 from being too high, affecting its service life. On the other hand, it can reduce the oxidation of the material 100 powder after being screened by the classification wheel 41, and improve the powder output speed and the consistency of the grinding particle size of the material 100 powder.

[0045] Reference Figure 1 As an optional implementation, the air classifier mill assembly 2 includes a grinding chamber 21, a feed inlet 22, and a nozzle 23. Among them, the grinding chamber 21 is disposed inside the air classifier mill body 1; the feed inlet 22 is communicated with the grinding chamber 21 for inputting the material 100 to be processed; the nozzle 23 is disposed at the lower end of the grinding chamber 21 for introducing high-pressure air into the grinding chamber 21.

[0046] When the jet mill assembly 2 processes the material 100, the material 100 to be processed is conveyed into the grinding chamber 21 through the feed inlet 22. High-pressure gas is sprayed into the interior of the grinding chamber 21 through the nozzle 23 to generate a high-pressure air flow and act on the material 100, causing the material 100 to collide with each other in the grinding chamber 21 and break into powders with the required particle size. Among them, the powders of the material 100 with lighter mass and smaller particle size rise with the high-pressure air flow and are conveyed to the classifier 4. After being screened by the classifier 4, they are conveyed to the material output assembly 3, so as to output the processed material 100 from the material output assembly 3.

[0047] In some embodiments, the number of nozzles 23 can be multiple. The multiple nozzles 23 can be respectively arranged at the bottom and the lower end of the grinding chamber 21, and the directions of the high-pressure gas fed into the grinding chamber 21 by the multiple nozzles 23 all converge to one place.

[0048] Reference Figure 2 , As an optional implementation manner, the partition protection member 32 is arranged on the inner wall of the pipe body 31 through an adhesive. To improve the reliability of the partition protection member 32 arranged inside the pipe body 31 and avoid falling off.

[0049] As an optional implementation manner, the adhesive is Chem-lock glue.

[0050] Reference Figure 2 , As an optional implementation manner, an embedding groove is arranged on the inner wall of the pipe body 31, and the partition protection member 32 is embedded in the embedding groove.

[0051] As an optional implementation manner, the outer shape of the partition protection member 32 is in a tile shape that matches the inner wall of the pipe body 31. Thereby improving the fit degree of the partition protection member 32 and the pipe body 31.

[0052] As an optional implementation manner, the partition protection member 32 includes at least one of alumina, zirconia, silicon carbide or silicon boride. The number of the partition protection members 32 can be multiple. The multiple partition protection members 32 are evenly laid on the inner wall of the pipe body 31 to completely cover and isolate the inner wall of the pipe body 31, so as to protect the inner wall of the pipe body 31, reduce wear and improve the service life of the material output assembly 3.

[0053] As an optional implementation manner, the inner diameter of the pipe body 31 is 150 - 160 mm.

[0054] In some embodiments, for example, a plurality of partition protection members 32 are evenly laid on the inner wall of the pipe body 31, and the gap between two adjacent partition protection members 32 is less than 5 μm. As much as possible, the gap between adjacent partition protection members 32 is made less than the particle size of the powder discharged from the material 100 to avoid powder accumulation at the gap. Secondly, the thickness of the partition protection member 32 ≤ 8% of the inner diameter of the pipe body 31, which fully ensures the aperture in the pipe body 31 for the material 100 to pass through for discharging, ensures that the powder of the material 100 can flow out smoothly, and avoids an increase in the pressure in the grinding chamber 21 caused by the blockage of the pipe body 31.

[0055] Through experiments, the particle size of the powder of the material 100 output by the jet mill device provided in this application is D90 / D10 = 4.0 - 4.2, and the pressure in the grinding chamber 21 is 26 - 28 MPa; while under the same conditions, the particle size of the powder of the material 100 output by the existing jet mill device without the partition protection member 32 is D90 / D10 = 4.3 - 4.5, and the pressure in the grinding chamber 21 is 32 - 34 MPa. It can be seen that compared with the existing jet mill device, the jet mill device of this application improves the grinding effect of the powder of the material 100 and at the same time reduces the pressure increase phenomenon in the grinding chamber 21.

[0056] As an optional implementation manner, a sliding component (not shown in the figure) is provided between the pipe body 31 and the partition protection member 32. The sliding component includes a guide rail and a sliding part. The guide rail can be arranged on the inner wall of the pipe body 31 or in an embedded groove, the limiting part is arranged on the surface of the partition protection member 32, and the free end of the sliding part is slidably arranged in the guide rail. The partition protection member 32 can slide along the guide rail through the sliding part. One end of the partition protection member 32 located at the output end of the pipe body 31 is provided with a protruding part, and the protruding part extends to the outside of the pipe body 31, so as to facilitate pulling out the partition protection member 32 from the pipe body 31 by clamping the protruding part. A limiting member is arranged between the guide rail and the partition protection member 32. When the partition protection member 32 is installed at a specified position, the partition protection member 32 is limited in the guide rail by the limiting member to prevent the partition protection member 32 from falling off from the pipe; when disassembling the partition protection member 32, the limiting member can be disassembled first, and then the partition protection member 32 can be pulled outwards by clamping the protruding part, so as to facilitate the replacement, maintenance or cleaning of the partition protection member 32, enable the partition protection member 32 to be reused repeatedly, and improve the service life. Among them, the limiting member can be a positioning pin.

[0057] The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, changes or deformations made by those skilled in the art based on the idea of the present application, within the specific implementation manner and application scope of the present application, all belong to the protection scope of the present application. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A jet mill device, characterized in that: include: Jet mill body; A jet mill assembly is arranged inside the jet mill body and is used for processing materials; A classifier, disposed inside the jet mill body and connected to the jet mill assembly, for screening the processed material; A material output component, the material output component comprising: A pipe body, which is arranged on the jet mill body and is connected to the classifier, and is used to discharge the screened material; The partition protection piece covers the inner wall of the tube body.

2. The jet mill device according to claim 1, characterized in that: The classifier comprises: A classifying wheel is arranged inside the jet mill body and is connected with the jet mill assembly; A driving motor is connected to the classifying wheel through a driving bearing to drive the classifying wheel to rotate.

3. The jet mill device according to claim 2, characterized in that: Also includes: A cooling assembly, the cooling assembly comprising: a heat conducting portion, disposed at at least one of the driving bearing and the driving motor; A cooling water input part is provided at one end of the heat conducting part and is in communication with the heat conducting part, and is used to transport cooling water into the interior of the heat conducting part for heat exchange; The drainage part is arranged at the other end of the heat conducting part and is used for discharging the cooling water after the heat exchange.

4. The air flow mill device according to any one of claims 1 to 3, characterized in that: The jet mill assembly comprises: A grinding chamber, arranged inside the airflow mill body; A feed inlet, connected to the grinding chamber, for inputting the material to be processed; The nozzle is arranged at the lower end of the grinding chamber and is used for introducing high-pressure airflow into the grinding chamber.

5. The air flow mill device according to any one of claims 1 to 3, characterized in that: The partition protection member is arranged on the inner wall of the tube body by adhesive.

6. The jet mill device according to claim 5, characterized in that: The adhesive is Chemlok glue.

7. The jet mill device according to any one of claims 1 to 3, characterized in that: The inner wall of the tube body is provided with an embedding groove, and the partition protection member is embedded in the embedding groove.

8. The air flow mill device according to any one of claims 1 to 3, characterized in that: The outer shape of the separation protection piece is in the shape of a tile which matches the inner wall of the tube body.

9. The air flow mill device according to any one of claims 1 to 3, characterized in that: The separation protection member includes at least one of aluminum oxide, zirconium oxide, silicon carbide or silicon boride.

10. The jet mill device according to any one of claims 1 to 3, characterized in that: The inner diameter of the tube body is 150-160 mm.

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