Neodymium-iron-boron powder jet mill granularity superfine grinding device

Abstract

The utility model relates to the technical field of jet mills, and discloses a neodymium iron boron powder jet mill granularity superfine grinding device which comprises an air inlet mechanism, a grinding mechanism is arranged in the air inlet mechanism, a supporting mechanism is arranged at the bottom of the grinding mechanism, and the air inlet mechanism comprises a grinding cylinder. A feeding pipe is fixedly connected to the surface of the smashing cylinder, a discharging pipe is fixedly connected to the top of the smashing cylinder, an air ring is fixedly connected to the surface of the smashing cylinder, an air inlet pipe is fixedly connected to the surface of the air ring, and an air inlet groove is formed in the inner side of the air ring. Compressed air enters the air ring through the air inlet pipe and then enters the crushing cylinder through the four air inlet grooves and the through grooves in the surface of the crushing cylinder to form high-speed air flow, so that the number of the air pipes is greatly reduced, the disorder that a large number of air pipes are crisscrossed is avoided, and the occupied space of equipment is effectively saved; and meanwhile, the maintenance complexity is greatly reduced due to the simple air inlet structure.

Description

Technical Field

[0001] This utility model relates to the field of air jet mill technology, and in particular to an air jet mill ultrafine grinding device for neodymium iron boron powder. Background Technology

[0002] In today's world, with the global advocacy for green energy and the rapid development of technology, the new energy vehicle industry is committed to improving driving range and power performance, the wind power generation sector strives to increase power generation efficiency and reduce maintenance costs, and 3C products are constantly pursuing thinner, lighter, and higher-performance designs. The booming development of these industries has created an extremely strong demand for high-performance neodymium iron boron (NdFeB) permanent magnet materials. As the most powerful permanent magnet material currently available, the performance of NdFeB permanent magnets largely depends on the particle size of their powder. Fine and uniform powder particle size can significantly improve key performance indicators such as permeability, coercivity, and remanence, thereby better meeting the stringent requirements of various industries. Looking back at traditional NdFeB powder grinding technology, ball milling inevitably introduces impurities due to the prolonged friction and collision between the grinding media and the powder. These impurities severely interfere with the microstructure of the material, reducing its purity and consequently affecting the performance stability of the permanent magnet. Moreover, the ball milling process makes it difficult to achieve precise particle size control, resulting in extremely uneven particle size distribution and inconsistent quality of the produced permanent magnet materials. In the mechanical impact milling process, over-grinding frequently occurs when attempting to obtain ultrafine particles. Over-grinding not only consumes a large amount of energy and reduces production efficiency, but also causes a sharp increase in particle surface energy, leading to particle agglomeration. This is not only detrimental to subsequent forming and processing, but also greatly weakens the overall performance of permanent magnet materials.

[0003] Existing airflow mills have a large number of crisscrossing air pipes on their surface, which not only occupy a lot of valuable space and pose a great challenge to equipment layout, but also make maintenance extremely complicated. Slight carelessness can lead to frequent pipe bends and blockages, severely disrupting airflow stability and greatly interfering with the pulverizing effect. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a neodymium iron boron powder airflow grinding ultrafine pulverization device.

[0005] This utility model is achieved by the following technical solution: a neodymium iron boron powder airflow grinding ultrafine pulverizing device, including an air inlet mechanism, a pulverizing mechanism is provided inside the air inlet mechanism, and a support mechanism is provided at the bottom of the pulverizing mechanism;

[0006] The air intake mechanism includes a crushing cylinder, a feed pipe fixedly connected to the surface of the crushing cylinder, a discharge pipe fixedly connected to the top of the crushing cylinder, an air ring fixedly connected to the surface of the crushing cylinder, an air intake pipe fixedly connected to the surface of the air ring, and an air intake groove opened on the inner side of the air ring.

[0007] Through the above technical solution, the air ring connects the air inlet pipe and the pulverizing cylinder, which plays a role in buffering and distributing the incoming compressed air, ensuring that the airflow can enter the pulverizing cylinder evenly through the air inlet slot, forming a stable high-speed airflow field.

[0008] As a further improvement to the above solution, the surface of the crushing cylinder is provided with a through groove, the air ring is located at the bottom of the feed pipe, and the number of air inlet grooves is set to four.

[0009] As a further improvement to the above solution, the air inlet groove is connected to the through groove on the surface of the crushing cylinder.

[0010] With the above technical solution, the air inlet slot is opened inside the air ring and is the channel for compressed air to enter the crushing cylinder. Multiple air inlets can make the airflow evenly spray into the crushing cylinder, fully contact the material and drive its fluidization.

[0011] As a further improvement to the above solution, the crushing mechanism includes a fixed rod, a drive motor fixedly connected to the bottom of the fixed rod, a first gear fixedly connected to the output end of the drive motor, a classifying wheel rotatably connected to the inner wall of the crushing cylinder, a connecting rod fixedly connected to the right side of the classifying wheel, and a second gear fixedly connected to the right side of the connecting rod.

[0012] Through the above technical solution, the first gear and the second gear are bevel gears.

[0013] As a further improvement to the above solution, the fixing rod is located on the surface of the crushing cylinder, one end of the fixing rod is fixedly connected to the crushing cylinder, and the first gear meshes with the second gear.

[0014] As a further improvement to the above solution, the support mechanism includes a support frame, the bottom of which is fixedly connected to an anti-slip pad, and the inside of which is fixedly connected to a crossbar.

[0015] Through the above technical solutions, the crossbars enhance the structural strength and stability of the support frame, disperse the stress generated during the operation of the device, and work together with the columns of the support frame to improve the overall load-bearing capacity of the support structure.

[0016] As a further improvement to the above solution, the support frame is located at the bottom of the fixed rod, and the top of the support frame is fixedly connected to the bottom of the fixed rod.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention utilizes an air ring design. Compressed air enters the air ring through an inlet pipe, then passes through four inlet slots and a groove on the surface of the grinding cylinder before entering the interior of the grinding cylinder, forming a high-speed airflow. This significantly reduces the number of air pipes, avoiding the chaotic appearance of numerous crisscrossing pipes, effectively saving equipment space and providing greater flexibility in equipment layout. Simultaneously, the simplified inlet structure greatly reduces maintenance complexity and minimizes airflow instability caused by pipe bends or blockages. It ensures that compressed air can stably and efficiently enter the cylinder through the inlet slots and the groove on the surface of the grinding cylinder, forming a stable and powerful high-speed airflow. This not only ensures that the NdFeB powder is smoothly fluidized and efficiently ground under the influence of the airflow, but also significantly improves the stability and reliability of the entire grinding process, greatly optimizing the grinding effect.

[0019] This invention utilizes a first gear and a second gear. A drive motor starts, causing the first gear to rotate. Through meshing with the second gear, the first gear drives the grading wheel to rotate. This gear transmission system exhibits excellent stability and reliability. During long-term continuous operation, compared to other transmission methods, the meshing transmission between gears maintains a relatively constant transmission ratio, ensuring smooth operation of the grading wheel, reducing vibration and impact, significantly improving the efficiency of material grading and screening, accelerating the overall crushing process, effectively increasing production efficiency, and reducing production costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the crushing cylinder structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the intake pipe structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the air inlet groove structure of this utility model;

[0024] Figure 5 This utility model Figure 1 Schematic diagram of cross-section structure.

[0025] Explanation of key symbols:

[0026] 1. Air intake mechanism; 101. Crushing cylinder; 102. Feed pipe; 103. Discharge pipe; 104. Air ring; 105. Air intake pipe; 106. Air intake groove; 2. Crushing mechanism; 201. Fixing rod; 202. Drive motor; 203. First gear; 204. Grading wheel; 205. Connecting rod; 206. Second gear; 3. Support mechanism; 301. Support frame; 302. Anti-slip pad; 303. Crossbar. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Example

[0028] Please combine Figure 1-5 The present embodiment of a neodymium iron boron powder airflow grinding ultrafine pulverizing device includes an air inlet mechanism 1, a pulverizing mechanism 2 is provided inside the air inlet mechanism 1, and a support mechanism 3 is provided at the bottom of the pulverizing mechanism 2.

[0029] The air intake mechanism 1 includes a crushing cylinder 101. A feed pipe 102 is fixedly connected to the surface of the crushing cylinder 101, and a discharge pipe 103 is fixedly connected to the top of the crushing cylinder 101. An air ring 104 is fixedly connected to the surface of the crushing cylinder 101, and an air intake pipe 105 is fixedly connected to the surface of the air ring 104. An air intake groove 106 is formed on the inner side of the air ring 104. Compressed air enters the air ring 104 through the air intake pipe 105, and then enters the interior of the crushing cylinder 101 through the air intake groove 106 and the groove on the surface of the crushing cylinder 101, forming a high-speed airflow. Neodymium iron boron powder enters from the feed pipe 102 and is fluidized under the action of the high-speed airflow.

[0030] The surface of the crushing cylinder 101 is provided with a through groove, the air ring 104 is located at the bottom of the feed pipe 102, and the number of air inlet grooves 106 is four.

[0031] The air inlet groove 106 is connected to the through groove on the surface of the crushing cylinder 101.

[0032] The crushing mechanism 2 includes a fixed rod 201, with a drive motor 202 fixedly connected to the bottom of the fixed rod 201. A first gear 203 is fixedly connected to the output end of the drive motor 202. A classifying wheel 204 is rotatably connected to the inner wall of the crushing cylinder 101. A connecting rod 205 is fixedly connected to the right side of the classifying wheel 204, and a second gear 206 is fixedly connected to the right side of the connecting rod 205. When the drive motor 202 starts, it drives the first gear 203 to rotate, which in turn drives the classifying wheel 204 to rotate through meshing with the second gear 206. Under the action of the airflow and the classifying wheel 204, the materials collide and rub against each other, thus being crushed. Fine powder that meets the particle size requirements is carried by the airflow and discharged through the discharge pipe 103, while coarse powder remains in the crushing cylinder 101 to participate in the crushing process after being screened by the classifying wheel 204.

[0033] The fixing rod 201 is located on the surface of the crushing cylinder 101, and one end of the fixing rod 201 is fixedly connected to the crushing cylinder 101. The first gear 203 meshes with the second gear 206.

[0034] The support mechanism 3 includes a support frame 301, with an anti-slip pad 302 fixedly connected to the bottom of the support frame 301. A crossbar 303 is fixedly connected inside the support frame 301. The device is supported by the support frame 301, the bottom anti-slip pad 302 ensures its stability, and the crossbar 303 enhances the stability of the support frame 301.

[0035] The support frame 301 is located at the bottom of the fixed rod 201, and the top of the support frame 301 is fixedly connected to the bottom of the fixed rod 201.

[0036] The implementation principle of the NdFeB powder airflow mill ultrafine grinding device in this embodiment is as follows: Compressed air enters the air ring 104 through the air inlet pipe 105, and then enters the interior of the grinding cylinder 101 through the air inlet groove 106 and the through groove on the surface of the grinding cylinder 101, forming a high-speed airflow. NdFeB powder enters from the feed pipe 102 and is fluidized under the drive of the high-speed airflow. The drive motor 202 starts, driving the first gear 203 to rotate, and through meshing with the second gear 206, drives the classifying wheel 204 to rotate. Under the action of the airflow and the classifying wheel 204, the material collides and rubs against each other and is crushed. Fine powder that meets the particle size requirements is discharged through the discharge pipe 103 under the carry of the airflow, while coarse powder continues to remain in the grinding cylinder 101 to participate in the crushing under the screening of the classifying wheel 204. The device is supported by a support frame 301, and the bottom anti-slip pad 302 ensures its stability. The crossbar 303 enhances the stability of the support frame 301.

[0037] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A neodymium-iron-boron powder airflow mill particle size ultrafine pulverizing device, characterized in that, Including air inlet mechanism (1), the inside of air inlet mechanism (1) is provided with the smashing mechanism (2), the bottom of smashing mechanism (2) is provided with support mechanism (3); The air inlet mechanism (1) includes a smashing cylinder (101), the surface of the smashing cylinder (101) is fixedly connected with a feeding pipe (102), the top of the smashing cylinder (101) is fixedly connected with a discharging pipe (103), the surface of the smashing cylinder (101) is fixedly connected with an air ring (104), the surface of the air ring (104) is fixedly connected with an air inlet pipe (105), and the inner side of the air ring (104) is provided with an air inlet groove (106).

2. The superfine powder grinding device for Nd-Fe-B powder airflow mill granularity according to claim 1, characterized in that: The surface of the smashing cylinder (101) is provided with a through groove, the air ring (104) is located at the bottom of the feeding pipe (102), and the number of the air inlet grooves (106) is four.

3. The superfine powder grinding device for Nd-Fe-B powder airflow mill granularity according to claim 1, characterized in that: The air inlet grooves (106) are communicated with the through grooves in the surface of the smashing cylinder (101).

4. The NdFeB powder airflow mill ultrafine grinding device as described in claim 1, characterized in that: The smashing mechanism (2) includes a fixed rod (201), the bottom of the fixed rod (201) is fixedly connected with a driving motor (202), the output end of the driving motor (202) is fixedly connected with a first gear (203), the inner wall of the smashing cylinder (101) is rotatably connected with a grading wheel (204), the right side of the grading wheel (204) is fixedly connected with a connecting rod (205), and the right side of the connecting rod (205) is fixedly connected with a second gear (206).

5. The superfine comminuting device for neodymium-iron-boron powder of claim 4, characterized in that: The fixed rod (201) is located on the surface of the smashing cylinder (101), one end of the fixed rod (201) is fixedly connected with the smashing cylinder (101), and the first gear (203) is engaged with the second gear (206).

6. The superfine comminuting device for neodymium-iron-boron powder of claim 1, wherein: the air classifier mill is a jet mill. The support mechanism (3) includes a support frame (301), the bottom of the support frame (301) is fixedly connected with an antiskid pad (302), and the inside of the support frame (301) is fixedly connected with a cross rod (303).

7. The superfine comminuting device for neodymium-iron-boron powder of claim 6, characterized in that: The support frame (301) is located at the bottom of the fixed rod (201), and the top of the support frame (301) is fixedly connected with the bottom of the fixed rod (201).

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