Powder mixing device for preparing sintered neodymium-iron-boron

Abstract

This invention discloses a powder mixing device for preparing sintered NdFeB, comprising: a mixing tank, which is cylindrical in shape, with an inlet at the top and an outlet at the bottom; a primary mixing assembly, including a feed pipe rotatably connected to the inlet, the top of the feed pipe being higher than the mixing tank and the bottom located inside the mixing tank, with a cylindrical primary mixing cylinder at the bottom of the feed pipe; a primary transition platform located below the primary mixing cylinder in the mixing tank, with a primary transfer pipe connected to the bottom of the primary transition platform; and a first driving assembly at the top of the mixing tank to drive the feed pipe to rotate; and a secondary mixing assembly, including a secondary mixing cylinder connected to the bottom of the driving pipe, the sidewall of the secondary mixing cylinder being a mesh structure. This invention achieves thorough mixing of the powder by setting up a primary mixing assembly and a secondary mixing assembly, thereby improving the performance of sintered NdFeB.

Description

Technical Field

[0001] This invention relates to the technical field of equipment for the preparation of sintered NdFeB. More specifically, this invention relates to a powder mixing apparatus for the preparation of sintered NdFeB. Background Technology

[0002] Neodymium magnets, also known as neodymium iron boron magnets, are manufactured using rare earth elements as raw materials through processes such as batching, smelting and ingot making, strip spinning, powder making, molding, sintering and tempering, magnetic testing, grinding, cutting, and electroplating. The batching process requires the use of mixing equipment to mix and stir various powder raw materials to ensure uniform mixing before pressing and molding. However, existing mixing equipment suffers from uneven mixing. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0004] Another objective of this invention is to provide a powder mixing device for preparing sintered NdFeB, which achieves thorough mixing of powder by setting a primary mixing component and a secondary mixing component, thereby improving the performance of sintered NdFeB.

[0005] To achieve these objectives and other advantages of the present invention, a powder mixing apparatus for the preparation of sintered NdFeB is provided, comprising:

[0006] A mixing tank, which has a cylindrical structure, has a feed inlet at the top and a discharge outlet at the bottom;

[0007] A primary mixing assembly includes a feed pipe rotatably connected to the feed inlet. The top end of the feed pipe is higher than the mixing tank, and the bottom end is located inside the mixing tank. A cylindrical primary mixing cylinder is provided at the bottom end of the feed pipe. The side wall of the primary mixing cylinder has a mesh structure. A primary transition platform with a larger upper diameter and a smaller lower diameter is provided at a position below the primary mixing cylinder in the mixing tank. A primary transfer pipe is connected to the bottom end of the primary transition platform. A drive pipe is rotatably connected to the outer side wall of the primary transfer pipe. A first drive assembly is provided at the top of the mixing tank to drive the feed pipe to rotate.

[0008] A secondary mixing assembly includes a secondary mixing cylinder connected to the bottom end of the drive tube. The sidewall of the secondary mixing cylinder has a mesh structure. The bottom end of the mixing tank is provided with a second drive assembly to drive the secondary mixing cylinder to rotate.

[0009] Preferably, the bottom end of the primary mixing cylinder is provided with a first stirring shaft, the upper part of the first stirring shaft is provided with a plurality of first stirring rods spaced vertically, the end of the first stirring rod is provided with a first scraper, the first scraper is in contact with the primary transition platform, the lower part of the first stirring shaft is provided with a plurality of sets of first stirring teeth spaced vertically, and the inner sidewall of the primary transfer tube is provided with a plurality of sets of second stirring teeth spaced vertically.

[0010] Preferably, the mixing tank is provided with a secondary transition platform with a larger upper diameter and a smaller lower diameter below the secondary mixing cylinder. The bottom end of the secondary transition platform is connected to a secondary transfer pipe, and the bottom end of the secondary transfer pipe is connected to the discharge port. The discharge port is connected to a discharge pipe.

[0011] The second drive assembly includes a second rotary motor located at the bottom of the mixing tank. The output shaft of the second rotary motor is connected to a second stirring shaft. The second stirring shaft rotates sequentially through the discharge pipe, the discharge port, the secondary transfer pipe, and the secondary transition platform and is connected to the secondary mixing cylinder. The upper part of the second stirring shaft is provided with multiple second stirring rods spaced vertically. The end of the second stirring rod is provided with a second scraper. The second scraper contacts the secondary transition platform. The lower part of the second stirring shaft is provided with multiple sets of third stirring teeth spaced vertically. The inner wall of the secondary transfer pipe is provided with multiple sets of fourth stirring teeth spaced vertically.

[0012] Preferably, the first drive assembly includes two first rotary motors disposed at the top of the mixing tank, the output shafts of the first rotary motors are connected to drive gears, and the outer side wall of the feed pipe is provided with a plurality of meshing teeth in a circumferential manner, the meshing teeth meshing with the drive gears to drive the feed pipe to rotate.

[0013] Preferably, two connecting rods are symmetrically provided on the outer edge of the top of the primary transition platform, and the two connecting rods are connected to the inner side wall of the mixing tank;

[0014] The mixing tank is equipped with two telescopic motors at the top. The output shaft of the telescopic motors is connected to a drive rod. The drive rod slides through the top of the mixing tank and is located inside the mixing tank. The end of the drive rod is equipped with an arc-shaped scraper, and the two scrapers are located on both sides of the connecting rod.

[0015] Preferably, the bottom end of the primary mixing cylinder is provided with a conical primary guide platform, the tip of which is positioned towards the feed pipe;

[0016] The bottom of the secondary mixing cylinder is provided with a conical secondary guide platform, the tip of which is positioned towards the drive tube.

[0017] Preferably, a fixed tube is provided at the feed inlet, and multiple annular first slide rails are provided on the inner side wall of the fixed tube. Multiple first sliders are provided on the outer side wall of the feed tube at intervals. The multiple first sliders are slidably connected to the multiple first slide rails in a one-to-one correspondence, so as to realize the rotational connection between the feed inlet and the feed tube.

[0018] Preferably, the outer side wall of the primary transfer tube is provided with multiple annular second slide rails spaced vertically, and the inner side wall of the drive tube is provided with multiple second sliders spaced vertically. The multiple second sliders are slidably connected to the multiple second slide rails in a one-to-one correspondence, so as to realize the rotational connection between the drive tube and the primary transfer tube.

[0019] The present invention has at least the following beneficial effects:

[0020] First, this invention achieves thorough mixing of powder by setting up a primary mixing component and a secondary mixing component, thereby improving the performance of sintered NdFeB. This invention achieves thorough mixing of powder under the action of centrifugal force by setting up a rotatable feed pipe and a primary mixing cylinder, and then mixes the powder in the primary transition platform under the action of centrifugal force, and then performs secondary mixing through the secondary mixing cylinder. After the mixing is completed, the powder is discharged from the discharge port into the mixing tank. This setting is more conducive to thorough mixing of materials and can also reduce material agglomeration.

[0021] Secondly, by setting a first stirring shaft, a first stirring rod, a first stirring tooth, and a second stirring tooth, the present invention serves two purposes: firstly, it stirs the material to make it mix more thoroughly; secondly, by setting a first scraper, and the first scraper being in contact with the first-stage transition platform, it prevents the material from adhering to the first-stage transition platform, thus avoiding waste of raw materials.

[0022] Third, by setting up a secondary transition platform and a second stirring shaft, this invention facilitates the discharge of materials from the mixing tank and further pulverizes the materials, reducing material agglomeration. By setting up a scraper, this invention can remove materials remaining on the inner wall of the mixing tank, and the top of the primary transition platform can also remove materials remaining on the scraper. In other words, this setting can effectively prevent materials from adhering to the inner wall of the mixing tank.

[0023] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the powder mixing device for preparing sintered NdFeB according to one of the technical solutions of the present invention;

[0025] Figure 2 for Figure 1 Enlarged view of A in the middle;

[0026] Figure 3 This is a schematic diagram of the scraper structure according to one of the technical solutions of the present invention;

[0027] Figure 4 This is a schematic diagram of the powder mixing device for preparing sintered NdFeB according to one of the technical solutions of the present invention. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0029] like Figure 1-4 As shown, the present invention provides a powder mixing device for the preparation of sintered NdFeB, comprising:

[0030] Mixing tank 1 is a cylindrical structure, with a feed inlet at the top and a discharge outlet at the bottom.

[0031] A primary mixing assembly includes a feed pipe 5 rotatably connected to the feed inlet. The top end of the feed pipe 5 is higher than the mixing tank 1, and the bottom end is located inside the mixing tank 1. A cylindrical primary mixing cylinder 6 is provided at the bottom end of the feed pipe 5. The side wall of the primary mixing cylinder 6 has a mesh structure. A primary transition platform 11 with a larger upper diameter and a smaller lower diameter is provided at the position below the primary mixing cylinder 6 in the mixing tank 1. A primary transfer pipe 14 is connected to the bottom end of the primary transition platform 11. A drive pipe 20 is rotatably connected to the outer side wall of the primary transfer pipe 14. A first drive assembly is provided at the top of the mixing tank 1 to drive the feed pipe 5 to rotate.

[0032] The secondary mixing assembly includes a secondary mixing cylinder 21 connected to the bottom end of the drive tube 20. The side wall of the secondary mixing cylinder 21 is a mesh structure. The bottom end of the mixing tank 1 is provided with a second drive assembly to drive the secondary mixing cylinder 21 to rotate.

[0033] In this technical solution, the mixing tank 1 is mounted on the support 2, the bottom of the primary mixing cylinder 6 is closed, the mesh of the side wall of the primary mixing cylinder 6 is blade-shaped, the primary transition platform 11, the primary transfer pipe 14, the drive pipe 20, the primary mixing cylinder 6, and the secondary mixing cylinder 21 are coaxially arranged, the bottom of the secondary mixing cylinder 21 is closed, and the mesh of the side wall of the secondary mixing cylinder 21 is blade-shaped.

[0034] During use, the powdered raw materials are added to the feed pipe 5 in proportion. The mixture enters the primary mixing cylinder 6 through the feed pipe 5. Under the rotation of the primary mixing cylinder 6, the mixture enters the mixing tank 1 through the side wall of the primary mixing cylinder 6, and then enters the secondary mixing cylinder 21 through the primary transition platform 11 and the primary transfer pipe 14. Under the rotation of the secondary mixing cylinder 21, the mixture enters the mixing tank 1 through the side wall of the secondary mixing cylinder 21 and is discharged from the outlet.

[0035] By adopting this technical solution, the present invention achieves thorough mixing of powder by setting a primary mixing component and a secondary mixing component, thereby improving the performance of sintered NdFeB. The present invention achieves thorough mixing of powder under the action of centrifugal force by setting a rotatable feed pipe 5 and a primary mixing cylinder 6, and then mixes the powder in the primary transition platform 11 under the action of centrifugal force, and performs secondary mixing through the secondary mixing cylinder 21. After the mixing is completed, the powder is discharged from the discharge port into the mixing tank 1. This setting is more conducive to thorough mixing of materials and can also reduce material agglomeration.

[0036] In another technical solution, the bottom end of the primary mixing cylinder 6 is provided with a first stirring shaft 12 (the first stirring shaft 12 is coaxially arranged with the primary mixing cylinder 6). Multiple first stirring rods 16 are spaced vertically at the upper part of the first stirring shaft 12. The first stirring rods 16 are horizontally arranged, and the ends of the first stirring rods 16 are provided with first scrapers 17. The first scrapers 17 contact the primary transition platform 11. Multiple sets of first stirring teeth 15 (each set of first stirring teeth 15 includes multiple first stirring teeth 15) are spaced vertically at the lower part of the first stirring shaft 12. Multiple sets of second stirring teeth 13 (each set of second stirring teeth 13 includes multiple second stirring teeth 13) are spaced vertically at the inner wall of the primary transfer pipe 14. By adopting this technical solution, the present invention, through the arrangement of the first stirring shaft 12, first stirring rods 16, first stirring teeth 15, and second stirring teeth 13, achieves a stirring effect, making the material more thoroughly mixed. Furthermore, by providing the first scraper 17, and ensuring that the first scraper 17 contacts the primary transition platform 11, it prevents material from adhering to the primary transition platform 11, thus avoiding material waste.

[0037] In another technical solution, the mixing tank 1 is provided with a secondary transition platform 26 with a larger upper diameter and a smaller lower diameter below the secondary mixing cylinder 21. The bottom end of the secondary transition platform 26 is connected to a secondary transfer pipe 27, and the bottom end of the secondary transfer pipe 27 is connected to the discharge port. The discharge port is connected to a discharge pipe 35.

[0038] The second drive assembly includes a second rotary motor 30 located at the bottom of the mixing tank 1. The output shaft of the second rotary motor 30 is connected to a second stirring shaft 23. The second stirring shaft 23 rotates sequentially through the discharge pipe 35, the discharge port, the secondary transfer pipe 27, and the secondary transition platform 26, and connects to the secondary mixing cylinder 21. The upper part of the second stirring shaft 23 has multiple second stirring rods 24 spaced vertically, and the ends of the second stirring rods 24 have second scrapers 25 that contact the secondary transition platform 26. The lower part of the second stirring shaft 23 has multiple sets of third stirring teeth 29 spaced vertically, and the inner wall of the secondary transfer pipe 27 has multiple sets of fourth stirring teeth 28 spaced vertically. By adopting this technical solution, the present invention, through the setting of the secondary transition platform 26 and the second stirring shaft 23, facilitates the discharge of materials from the mixing tank 1 and allows for further pulverization of the materials, reducing material agglomeration.

[0039] In another technical solution, the first driving assembly includes two first rotary motors 7 (the two first rotary motors 7 are spaced apart) located at the top of the mixing tank 1. A drive gear 8 (the central axis of the drive gear 8 is vertically aligned) is connected to the end of the output shaft of each first rotary motor 7. Multiple meshing teeth 9 are circumferentially arranged on the outer wall of the feed pipe 5, and these meshing teeth 9 mesh with the drive gear 8 to drive the feed pipe 5 to rotate. Using this technical solution, the present invention achieves the rotation of the feed pipe 5 by configuring the first rotary motors 7, the meshing teeth 9, and the drive gear 8.

[0040] In another technical solution, two connecting rods 34 are symmetrically provided on the outer edge of the top of the primary transition platform 11. The connecting rods 34 are horizontally arranged and connected to the inner wall of the mixing tank 1.

[0041] Two telescopic motors 3 are installed at the top of the mixing tank 1. The output shafts of the telescopic motors 3 are connected to drive rods. The drive rods slide through the top of the mixing tank 1 and are located inside the mixing tank 1. An arc-shaped scraper 4 is provided at the end of the drive rod. The two scraper 4 are located on both sides of the connecting rod 34. The bottom of the scraper 4 is lower than the connecting rod 34, and the top of the scraper 4 is higher than the connecting rod 34. During use, the scraper 4 can scrape off the material on the side wall of the mixing tank 1. By adopting this technical solution, the present invention, by setting the scraper 4, can, on the one hand, scrape off the material remaining on the inner wall of the mixing tank 1, and on the other hand, scrape off the material remaining on the scraper 4 through the top of the primary transition platform 11. That is, this setting can effectively prevent the material from adhering to the inner wall of the mixing tank 1.

[0042] In another technical solution, the bottom end of the primary mixing cylinder 6 is provided with a conical primary guide platform 10, and the tip of the primary guide platform 10 is set towards the feed pipe 5.

[0043] The bottom end of the secondary mixing cylinder 21 is provided with a conical secondary guide platform, the tip of which faces the drive tube 20. By adopting this technical solution, the present invention, through the provision of the primary guide platform 10 and the secondary guide platform 22, facilitates the discharge of the mixture from the primary mixing cylinder 6 and the secondary mixing cylinder 21, reducing the accumulation of the mixture within these two cylinders.

[0044] In another technical solution, a fixed tube 31 is provided at the feed inlet. Multiple annular first slide rails 32 are provided on the inner wall of the fixed tube 31 (the first slide rails 32 are coaxially arranged with the fixed tube 31). Multiple first sliders 33 are provided at intervals on the outer wall of the feed pipe 5. The multiple first sliders 33 are slidably connected to the multiple first slide rails 32 in a one-to-one correspondence, thereby achieving a rotatable connection between the feed inlet and the feed pipe 5. This technical solution achieves a rotatable connection between the feed inlet and the feed pipe 5.

[0045] In another technical solution, the outer wall of the primary transfer tube 14 is provided with multiple annular second slide rails 19 spaced vertically, and the second slide rails are coaxially arranged with the primary transfer tube 14. The inner wall of the drive tube 20 is provided with multiple second sliders 18 spaced vertically, and the multiple second sliders 18 are slidably connected to the multiple second slide rails 19 in a one-to-one correspondence, so as to realize the rotational connection between the drive tube 20 and the primary transfer tube 14. This technical solution is adopted to realize the rotational connection between the drive tube 20 and the primary transfer tube 14.

[0046] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the powder mixing apparatus for the preparation of sintered NdFeB according to the present invention will be readily apparent to those skilled in the art.

[0047] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A powder mixing device for the preparation of sintered NdFeB, characterized in that, include: A mixing tank, which has a cylindrical structure, has a feed inlet at the top and a discharge outlet at the bottom; A primary mixing assembly includes a feed pipe rotatably connected to the feed inlet. The top end of the feed pipe is higher than the mixing tank, and the bottom end is located inside the mixing tank. A cylindrical primary mixing cylinder is provided at the bottom end of the feed pipe. The side wall of the primary mixing cylinder has a mesh structure. A primary transition platform with a larger upper diameter and a smaller lower diameter is provided at a position below the primary mixing cylinder in the mixing tank. A primary transfer pipe is connected to the bottom end of the primary transition platform. A drive pipe is rotatably connected to the outer side wall of the primary transfer pipe. A first drive assembly is provided at the top of the mixing tank to drive the feed pipe to rotate. A secondary mixing assembly includes a secondary mixing cylinder connected to the bottom end of the drive tube. The sidewall of the secondary mixing cylinder has a mesh structure. The bottom end of the mixing tank is provided with a second drive assembly to drive the secondary mixing cylinder to rotate. The bottom end of the primary mixing cylinder is provided with a first stirring shaft, the upper part of the first stirring shaft is provided with multiple first stirring rods spaced vertically, the end of the first stirring rod is provided with a first scraper, the first scraper is in contact with the primary transition platform, the lower part of the first stirring shaft is provided with multiple sets of first stirring teeth spaced vertically, and the inner side wall of the primary transfer tube is provided with multiple sets of second stirring teeth spaced vertically. The outer wall of the primary transfer tube is provided with multiple annular second slide rails spaced vertically, and the inner wall of the drive tube is provided with multiple second sliders spaced vertically. The multiple second sliders are slidably connected to the multiple second slide rails in a one-to-one correspondence, so as to realize the rotational connection between the drive tube and the primary transfer tube.

2. The powder mixing apparatus for preparing sintered NdFeB as described in claim 1, characterized in that, The mixing tank is provided with a secondary transition platform with a larger upper diameter and a smaller lower diameter below the secondary mixing cylinder. The bottom end of the secondary transition platform is connected to a secondary transfer pipe, and the bottom end of the secondary transfer pipe is connected to the discharge port. The discharge port is connected to a discharge pipe. The second drive assembly includes a second rotary motor located at the bottom of the mixing tank. The output shaft of the second rotary motor is connected to a second stirring shaft. The second stirring shaft rotates sequentially through the discharge pipe, the discharge port, the secondary transfer pipe, and the secondary transition platform and is connected to the secondary mixing cylinder. The upper part of the second stirring shaft is provided with multiple second stirring rods spaced vertically. The end of the second stirring rod is provided with a second scraper. The second scraper contacts the secondary transition platform. The lower part of the second stirring shaft is provided with multiple sets of third stirring teeth spaced vertically. The inner wall of the secondary transfer pipe is provided with multiple sets of fourth stirring teeth spaced vertically.

3. The powder mixing apparatus for preparing sintered NdFeB as described in claim 1, characterized in that, The first drive assembly includes two first rotary motors located at the top of the mixing tank. The output shafts of the first rotary motors are connected to drive gears. The outer side wall of the feed pipe is provided with a plurality of meshing teeth, which mesh with the drive gears to drive the feed pipe to rotate.

4. The powder mixing apparatus for preparing sintered NdFeB as described in claim 1, characterized in that, Two connecting rods are symmetrically provided on the outer edge of the top of the primary transition platform, and the two connecting rods are connected to the inner side wall of the mixing tank. The mixing tank is equipped with two telescopic motors at the top. The output shaft of the telescopic motors is connected to a drive rod. The drive rod slides through the top of the mixing tank and is located inside the mixing tank. The end of the drive rod is equipped with an arc-shaped scraper, and the two scrapers are located on both sides of the connecting rod.

5. The powder mixing device for preparing sintered NdFeB as described in claim 2, characterized in that, The bottom end of the primary mixing cylinder is provided with a conical primary guide platform, the tip of which is set towards the feed pipe; The bottom of the secondary mixing cylinder is provided with a conical secondary guide platform, the tip of which is positioned towards the drive tube.

6. The powder mixing apparatus for preparing sintered NdFeB as described in claim 1, characterized in that, A fixed tube is provided at the feed inlet. Multiple annular first slide rails are provided on the inner side wall of the fixed tube. Multiple first sliders are provided at intervals on the outer side wall of the feed tube. The multiple first sliders are slidably connected to the multiple first slide rails in a one-to-one correspondence, so as to realize the rotational connection between the feed inlet and the feed tube.

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