Neodymium iron boron jet mill

Abstract

The utility model discloses a neodymium iron boron jet mill which comprises a lower shell and an upper shell, the upper shell is fixedly installed on the top of the lower shell, an upper fixing frame and a lower supporting frame are fixedly installed on the upper portion and the lower portion in the lower shell respectively, and a milling assembly is fixedly installed between the upper fixing frame and the lower supporting frame. And an air inlet pipe is fixedly installed on the lower portion in the lower shell, a rapping assembly is fixedly installed at the bottom of the lower shell, and a material returning assembly is fixedly installed on the outer side of the lower shell. According to the neodymium iron boron jet mill, after materials enter the outer material guide cover, a first driving motor drives a first rotating shaft to rotate, the first rotating shaft drives a conical sleeve and a dispersing disc to rotate, the conical sleeve rotates to enable a grinding roller to rotate rapidly, the materials are ground, and smashed powder falls onto the dispersing disc from gaps and is thrown to the outer side; and through cooperation of the conical sleeve and the outer material guide cover, efficient grinding of the materials is ensured, the smashing effect is enhanced, and the grinding efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet preparation technology, specifically a neodymium iron boron air jet mill. Background Technology

[0002] Neodymium magnets, also known as neodymium iron boron magnets, are tetragonal crystals formed from neodymium, iron, and boron. Neodymium iron boron magnets are currently the second most powerful permanent magnets after holmium magnets at absolute zero, and are also the most commonly used rare-earth magnets. Due to their excellent properties of high remanence, high coercivity, and high energy product, and their ease of processing into various shapes and specifications, neodymium iron boron permanent magnet materials are widely used in permanent magnetic field devices and equipment such as electroacoustics and telecommunications, motors, instruments, nuclear magnetic resonance, magnetic levitation, and magnetic sealing. They are particularly suitable for manufacturing various high-performance, complex-shaped products. The production process of neodymium iron boron permanent magnet materials includes steps such as batching, ingot casting, hydrogen explosion, grinding, oxygen-free molding, and sintering, thereby obtaining magnetic materials with certain magnetic properties. In the above process, the grinding process uses an air jet mill.

[0003] The existing patent publication number CN108855420A discloses an air jet mill and a grinding process for neodymium iron boron permanent magnets. By rotating the grinding disc, the magnetic particles move from the center of the grinding disc to the edge due to centrifugal force. The grinding roller contacts the grinding disc. As the grinding disc rotates, the grinding roller also rotates around its own axis. When the magnetic particles pass through the crushing area on the grinding disc that contacts the grinding roller, the magnetic particles are crushed by the grinding roller.

[0004] In the aforementioned patent, since the grinding rollers are only located on both sides above the grinding disc, and the grinding disc is relatively large, a large number of magnetic particles are thrown out by the centrifugal force of the grinding disc, resulting in fewer magnetic particles being ground by the grinding rollers. Consequently, the coarse powder needs to be fed back for grinding multiple times, resulting in poor grinding efficiency. At the same time, the coarse powder easily adheres to the receiving hopper when it falls into it, making it impossible to ensure rapid collection and return. Utility Model Content

[0005] The purpose of this invention is to provide a neodymium iron boron air jet mill to solve the problems mentioned in the background art, where the grinding rollers are only set on both sides above the grinding disc, and the grinding disc is relatively large. As a result, there are many magnetic particles thrown out by the centrifugal force of the grinding disc, resulting in fewer magnetic particles being ground by the grinding rollers. Consequently, coarse powder needs to be fed back for grinding multiple times, resulting in poor grinding efficiency. At the same time, coarse powder tends to adhere to the receiving hopper when it falls into the receiving hopper, making it impossible to ensure rapid collection and return.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a neodymium iron boron air jet mill, comprising a lower shell and an upper shell, wherein the upper shell is fixedly installed on the top of the lower shell, an upper fixing frame and a lower support frame are fixedly installed on the upper and lower sides of the lower shell respectively, a grinding assembly is fixedly installed between the upper fixing frame and the lower support frame, an air inlet pipe is fixedly installed at the lower part of the lower shell, a vibrating assembly is fixedly installed at the bottom of the lower shell, and a material return assembly is fixedly installed on the outer side of the lower shell;

[0007] The grinding assembly includes an outer guide cover fixedly installed on the top of the lower support frame. A rotating shaft is rotatably installed inside the lower support frame. A conical sleeve located inside the outer guide cover is fixedly installed on the outside of the rotating shaft. A groove is provided on the outer side of the conical sleeve. A grinding roller is movably installed inside the groove. A drive motor that is connected to the rotating shaft is fixedly installed inside the upper fixed frame. A dispersing disc located below the lower support frame is fixedly installed at the bottom of the rotating shaft.

[0008] Preferably, the outer guide cover and the conical sleeve are arranged on the same axis, and the rotating shaft is conical.

[0009] Preferably, the grinding rollers are arranged in a ring at equal intervals outside the conical sleeve.

[0010] Preferably, the dispersing disc is conical in shape and is fixedly connected to the bottom of the rotating shaft by bolts.

[0011] Preferably, the return material assembly includes a guide cylinder, which is fixedly installed on the outside of the lower housing. The bottom of the lower housing is inclined to the side of the guide cylinder. The lower housing is connected to the lower inner side of the guide cylinder. A drive motor is fixedly installed at the bottom of the guide cylinder. A feeding auger connected to the drive motor is movably installed inside the guide cylinder. A return material pipe is fixedly connected to the upper inner side of the guide cylinder. The return material pipe is located above the outer guide cover.

[0012] Preferably, the vibratory assembly includes an ear plate fixedly installed at the bottom of the lower housing, a second rotating shaft movably installed on the inner side of the ear plate, a second drive motor connected to the second rotating shaft fixedly installed on the outer side of the ear plate, an outer sleeve fixedly installed on the outer side of the second rotating shaft, and a striking block movably installed on the outer side of the outer sleeve, the striking block being connected to the outer sleeve by a rope.

[0013] Preferably, a rotor drive device is fixedly installed on the top of the upper housing, and a rotor connected to the rotor drive device is fixedly installed on the top of the inner side of the upper housing.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. After the material enters the outer guide hood, the drive motor drives the rotating shaft to rotate. The rotating shaft drives the conical sleeve and the dispersing disc to rotate. The rotation of the conical sleeve causes the grinding roller to rotate rapidly, grinding the material. The crushed powder falls from the gap onto the dispersing disc and is thrown to the outside. The cooperation between the conical sleeve and the outer guide hood ensures efficient grinding of the material, enhances the crushing effect, and improves the grinding efficiency.

[0016] 2. The rotation of the second drive motor causes the second rotating shaft between the ear plates to rotate, which in turn causes the outer casing to rotate. The rotation of the outer casing drives the striking block to rotate, and the striking block strikes the bottom of the lower casing, causing the bottom of the lower casing to vibrate. This causes the coarse powder at the bottom of the lower casing to vibrate rapidly and gather towards the return material assembly, preventing the coarse powder from accumulating at the bottom of the lower casing and improving the smoothness and stability of the process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a cross-sectional structural diagram of the lower shell and the upper shell of this utility model;

[0019] Figure 3 This is a schematic cross-sectional view of the grinding assembly of this utility model;

[0020] Figure 4 This is a cross-sectional structural diagram of the material recycling component of this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the vibration component of this utility model.

[0022] In the diagram: 1. Lower shell; 2. Upper shell; 3. Upper fixed frame; 4. Lower support frame; 5. Air inlet pipe; 6. Grinding assembly; 61. Outer guide cover; 62. Rotating shaft one; 63. Conical sleeve; 64. Groove; 65. Grinding roller; 66. Drive motor one; 67. Dispersing disc; 7. Vibrating assembly; 71. Ear plate; 72. Rotating shaft two; 73. Drive motor two; 74. Outer sleeve; 75. Impact block; 8. Return assembly; 81. Guide cylinder; 82. Drive motor three; 83. Feeding auger; 84. Return pipe; 9. Rotor drive device; 10. Rotor. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This utility model provides a technical solution: a neodymium iron boron air jet mill, comprising a lower housing 1 and an upper housing 2. The upper housing 2 is fixedly installed on the top of the lower housing 1. An upper fixed frame 3 and a lower support frame 4 are fixedly installed on the upper and lower sides of the lower housing 1, respectively. A grinding assembly 6 is fixedly installed between the upper fixed frame 3 and the lower support frame 4. An air inlet pipe 5 is fixedly installed on the lower part of the lower housing 1. A vibrating assembly 7 is fixedly installed on the bottom of the lower housing 1. A return material assembly 8 is fixedly installed on the outer side of the lower housing 1. The grinding assembly 6 includes an outer guide cover 61 fixedly installed on the top of the lower support frame 4. A rotating shaft 62 is rotatably installed inside the lower support frame 4. A conical sleeve 63 located inside the outer guide cover 61 is fixedly installed outside the rotating shaft 62. A groove 64 is opened on the outer side of the conical sleeve 63. A grinding roller 65 is movably installed inside the groove 64. The upper fixed frame... Inside the 3, a drive motor 66 is fixedly installed and is connected to the rotating shaft 62. A dispersing disc 67 located below the lower support frame 4 is fixedly installed at the bottom of the rotating shaft 62. After the granular material falls into the outer guide cover 61, the drive motor 66 drives the rotating shaft 62 to rotate. The rotating shaft 62 simultaneously drives the conical sleeve 63 and the dispersing disc 67 to rotate. The rotation of the conical sleeve 63 causes the grinding roller 65 in its outer groove 64 to rotate rapidly. The grinding roller 65 grinds the material in the gap between the conical sleeve 63 and the outer guide cover 61. The crushed powder falls from the gap between the outer guide cover 61 and the conical sleeve 63 onto the dispersing disc 67 and is thrown outward as the dispersing disc 67 rotates. The high-speed rotating conical sleeve 63 and the outer guide cover 61 work together to ensure that the material is fully and efficiently ground, which enhances the particle crushing effect and thus improves the grinding efficiency.

[0025] The outer guide cover 61 and the conical sleeve 63 are arranged on the same axis, and the rotating shaft 62 is conical. The conical angle of the rotating shaft 62 is matched with the conical angle of the conical sleeve 63. The coaxiality of the outer guide cover 61 and the conical sleeve 63 ensures the stability of the grinding roller 65 running in the groove 64 and avoids uneven grinding or accelerated wear of parts caused by different axes.

[0026] The grinding rollers 65 are arranged in a ring at equal intervals outside the conical sleeve 63. The surface of the grinding rollers 65 and the inside of the outer guide cover 61 are provided with wear-resistant layers, which extends the service life. The ring-shaped distribution of the grinding rollers 65 ensures that the material can be fully ground in between, while avoiding material blockage caused by too small a spacing, thus ensuring the smooth progress of the grinding process.

[0027] The dispersing disc 67 is conical in shape and is fixed to the bottom of the rotating shaft 62 by bolts. The conical shape of the dispersing disc 67 is conducive to the material being dispersed more evenly in all directions under the action of centrifugal force, which improves the material dispersion efficiency. The bolt connection method is not only easy to install, but also easy to disassemble, which facilitates the regular maintenance and replacement of the dispersing disc 67.

[0028] Please see Figure 4 and Figure 5 The return material assembly 8 includes a guide cylinder 81, which is fixedly installed on the outside of the lower housing 1. The bottom of the lower housing 1 is inclined to the side of the guide cylinder 81. The lower housing 1 is connected to the lower inner side of the guide cylinder 81. A drive motor 82 is fixedly installed at the bottom of the guide cylinder 81. A feeding auger 83 connected to the drive motor 82 is movably installed inside the guide cylinder 81. A return material pipe 84 is fixedly connected to the upper inner side of the guide cylinder 81. The return material pipe 84 is located above the outer guide cover 61. The drive motor 82 drives the feeding auger 83 to rotate and convey the coarse powder upward to the return material pipe 84 and back into the outer guide cover 61 for re-grinding, so that the material can be circulated and ground to ensure the material utilization rate.

[0029] The rapping assembly 7 includes ear plates 71 fixedly installed at the bottom of the lower housing 1. A rotating shaft 72 is movably installed inside the ear plates 71. A drive motor 73 connected to the rotating shaft 72 is fixedly installed outside the ear plates 71. An outer sleeve 74 is fixedly installed outside the rotating shaft 72. An impact block 75 is movably installed outside the outer sleeve 74. The impact block 75 is connected to the outer sleeve 74 by a rope. The rotation of the drive motor 73 causes the rotating shaft 72 between the ear plates 71 to rotate, which in turn causes the outer sleeve 74 to rotate. The rotation of the outer sleeve 74 drives the impact block 75 to rotate, and the impact block 75 strikes the bottom of the lower housing 1, causing the bottom of the lower housing 1 to vibrate. This causes the coarse powder at the bottom of the lower housing 1 to vibrate rapidly and gather towards the return material assembly 8, preventing the coarse powder from accumulating at the bottom of the lower housing 1 and improving the smoothness and stability of the process.

[0030] Please see Figure 2 The top of the upper shell 2 is fixedly installed with a rotor drive device 9, and the top of the upper shell 2 is fixedly installed with a rotor 10 connected to the rotor drive device 9. The rotor drive device 9 drives the rotor 10 to rotate at different speeds, so that finished products with different fineness can be obtained.

[0031] Working principle: Particles are fed to the outer guide cover 61 through the feeding pipe outside the lower housing 1 and fall into the inner part of the outer guide cover 61. The drive motor 66 drives the rotating shaft 62 to rotate, and the rotating shaft 62 drives the conical sleeve 63 and the dispersing disk 67 to rotate synchronously. The rotation of the conical sleeve 63 causes the grinding roller 65 in the outer groove 64 to rotate rapidly. The grinding roller 65, located in the gap between the conical sleeve 63 and the outer guide cover 61, grinds the falling particles into powder. The powder falls from the gap between the outer guide cover 61 and the conical sleeve 63 onto the dispersing disk 67 and is thrown outward by centrifugal force as the dispersing disk 67 rotates. The high-speed rotating conical sleeve 63, in conjunction with the outer guide cover 61, grinds the particles, thereby improving the grinding effect and increasing the grinding efficiency.

[0032] Air is supplied from the outside into the lower housing 1 through the air inlet pipe 5 located below the dispersion disc 67, blowing the fine powder upwards. The coarse powder, being heavier, falls into the lower part of the lower housing 1 and rolls and gathers towards the return material assembly 8. The drive motor 2 73 drives the rotating shaft 2 72 between the ear plates 71 to rotate. When the rotating shaft 2 72 rotates, it drives the outer sleeve 74 to rotate. The outer sleeve 74 drives the striking block 75 to rotate and strike the bottom of the lower housing 1, causing the bottom of the lower housing 1 to vibrate. This vibration causes the coarse powder located at the bottom of the lower housing 1 to vibrate and quickly gather towards the guide cylinder 81 and enter the guide cylinder 81. The drive motor 3 82 drives the feeding auger 83 to rotate, conveying the coarse powder upwards to the return pipe 84 and re-entering the outer guide cover 61 for re-grinding. The above is the working process of the entire device. All contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A neodymium iron boron air jet mill, comprising a lower housing (1) and an upper housing (2), characterized in that: The upper shell (2) is fixedly installed on the top of the lower shell (1). The upper fixed frame (3) and the lower support frame (4) are fixedly installed on the upper and lower sides of the lower shell (1) respectively. A grinding assembly (6) is fixedly installed between the upper fixed frame (3) and the lower support frame (4). An air inlet pipe (5) is fixedly installed at the bottom of the lower shell (1). A vibrating assembly (7) is fixedly installed at the bottom of the lower shell (1). A return material assembly (8) is fixedly installed on the outside of the lower shell (1). The grinding assembly (6) includes an outer guide cover (61) fixedly installed on the top of the lower support frame (4). A rotating shaft (62) is rotatably installed inside the lower support frame (4). A conical sleeve (63) located inside the outer guide cover (61) is fixedly installed on the outside of the rotating shaft (62). A groove (64) is provided on the outside of the conical sleeve (63). A grinding roller (65) is movably installed inside the groove (64). A drive motor (66) that is connected to the rotating shaft (62) is fixedly installed inside the upper fixed frame (3). A dispersing disc (67) located below the lower support frame (4) is fixedly installed at the bottom of the rotating shaft (62).

2. The neodymium iron boron air jet mill according to claim 1, characterized in that: The outer guide cover (61) and the conical sleeve (63) are arranged on the same axis, and the rotating shaft (62) is conical.

3. The neodymium iron boron air jet mill according to claim 1, characterized in that: The grinding roller (65) is arranged in a ring at equal intervals outside the conical sleeve (63).

4. A neodymium iron boron air jet mill according to claim 3, characterized in that: The dispersion disc (67) is conical in shape and is fixedly connected to the bottom of the rotating shaft (62) by bolts.

5. A neodymium iron boron air jet mill according to claim 1, characterized in that: The return assembly (8) includes a guide cylinder (81), which is fixedly installed on the outside of the lower housing (1). The bottom of the lower housing (1) is inclined to the side of the guide cylinder (81). The lower housing (1) is connected to the lower inner side of the guide cylinder (81). A drive motor (82) is fixedly installed at the bottom of the guide cylinder (81). A feeding auger (83) connected to the drive motor (82) is movably installed inside the guide cylinder (81). A return pipe (84) is fixedly connected to the upper inner side of the guide cylinder (81). The return pipe (84) is located above the outer guide cover (61).

6. A neodymium iron boron air jet mill according to claim 1, characterized in that: The vibrating assembly (7) includes an ear plate (71) fixedly installed at the bottom of the lower housing (1). A rotating shaft (72) is movably installed on the inner side of the ear plate (71). A drive motor (73) connected to the rotating shaft (72) is fixedly installed on the outer side of the ear plate (71). An outer sleeve (74) is fixedly installed on the outer side of the rotating shaft (72). A striking block (75) is movably installed on the outer side of the outer sleeve (74). The striking block (75) is connected to the outer sleeve (74) by a rope.

7. A neodymium iron boron air jet mill according to claim 5, characterized in that: The top of the upper housing (2) is fixedly installed with a rotor drive device (9), and the top of the upper housing (2) is fixedly installed with a rotor (10) connected to the rotor drive device (9).

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