A sintered neodymium-iron-boron airflow mill powder sampling device

Abstract

The utility model discloses a sintered neodymium iron boron airflow mill powder material sampling device, including connecting cylinder, sampling pipeline, connecting rod and handle, and connecting cylinder is located in the discharge position of airflow mill equipment, and the inside of sampling pipeline is linked with connecting cylinder, and the ball valve and nitrogen filling mouth are installed on sampling pipeline, and the lateral wall of connecting rod is equipped with sampling groove, and the outlet of ball valve is the discharge port of sampling groove, and connecting rod is worn in sampling pipeline, and one end of connecting rod is equipped with sealing mechanism, and the other end is linked with handle, and handle is used for driving connecting rod rotation or driving connecting rod axial movement along sampling pipeline, and sealing mechanism is used for sealing the inside of sampling pipeline after sampling groove enters sampling pipeline. The powder material sampling device adopts the innovative structure design, can avoid the influence of powder material cross -over and makes the sample of collection can truly reflect the powder material characteristic, provides reliable powder material granularity data support for the quality control and optimization of sintered neodymium iron boron grain refinement process.

Description

Technical Field

[0001] This utility model belongs to the field of powder metallurgy technology, specifically relating to a sampling device for sintered NdFeB airflow mill powder. Background Technology

[0002] In the production of sintered NdFeB magnets, grain refinement technology is a key process for improving the magnetic properties of the product. Grain refinement effectively improves the magnetic domain structure of the material, enhancing performance indicators such as intrinsic coercivity and remanence. During the implementation of grain refinement technology, parameters such as the particle size distribution, particle size uniformity, and particle morphology of the powder produced by the air jet mill play a crucial role in the magnetic properties of the product. Therefore, obtaining representative powder samples that meet the process requirements during the air jet mill production process is the core aspect of powder particle size quality testing and process control in the NdFeB air jet mill section.

[0003] Currently, sampling devices for air classifier mills are connected to the mill's feed pipe for sampling. However, existing sampling devices have drawbacks. During powder production, powder tends to accumulate and remain in the sampling port and pipe, mixing with subsequent samples of other particle sizes. This is especially true for NdFeB powders using grain refinement technology, where the D50 value is generally between 2.0μm and 3.5μm, making powder agglomeration more likely. This makes it difficult to accurately obtain effective powder samples during sampling, resulting in the detected D50 value not reflecting the actual particle size, leading to misjudgments and ultimately affecting the magnetic properties of the product. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a sintered NdFeB airflow mill powder sampling device to address the shortcomings of the existing technology. This device can avoid the influence of powder cross-contamination on the test values ​​of powder samples, and enable the collected samples to truly reflect the characteristics of the powder. It provides reliable powder particle size data support for the quality control and optimization of the sintered NdFeB grain refinement process.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a sintered NdFeB air jet mill powder sampling device, including a connecting cylinder, a sampling pipe, a connecting rod, and a handle. The connecting cylinder is located at the discharge position of the air jet mill equipment. The inner side of the sampling pipe is connected to the connecting cylinder. A ball valve and a nitrogen filling port are installed on the sampling pipe. A sampling groove is opened on the side wall of the connecting rod. The outlet of the ball valve is the discharge port of the powder sampled by the sampling groove. The connecting rod passes through the sampling pipe. One end of the connecting rod is provided with a sealing mechanism. The other end of the connecting rod is connected to the handle. The handle is used to drive the connecting rod to rotate or drive the connecting rod to move axially along the sampling pipe. The sealing mechanism is used to seal the inner side of the sampling pipe after the sampling groove enters the sampling pipe.

[0006] In use, the sampling device of this invention allows the connecting rod to rotate or move axially by operating the handle. After sampling the powder sample in the sampling tank, pulling the connecting rod moves the sampling tank into the sampling pipe and closer to the ball valve. Once the sampling tank enters the sampling pipe, the sealing mechanism seals the pipe, at which point the ball valve can be opened, allowing the powder sample to be output from its outlet. During the sampling process, high-purity nitrogen is introduced into the sampling device through the nitrogen filling port to prevent powder oxidation. The high-purity nitrogen creates positive pressure within the sampling pipe, ensuring successful sampling of the powder sample.

[0007] This utility model presents a sampling device suitable for airflow mill powder sampling in the sintering NdFeB grain refinement process. By setting a sealing mechanism on the connecting rod, the inner side of the sampling pipe can be sealed after the sampling slot enters the sampling pipe, preventing other powders in the connecting cylinder from entering the sampling pipe during sampling and production. This avoids the influence of powder cross-contamination on the test values ​​of the powder sample, ensuring that the collected sample can truly reflect the powder characteristics. This provides reliable powder particle size data support for the quality control and optimization of the sintering NdFeB grain refinement process.

[0008] Preferably, the sealing mechanism includes a primary sealing plug and a secondary sealing plug, which are spaced apart inside the sampling groove. The outer diameters of the primary and secondary sealing plugs are adapted to the inner diameter of the sampling pipe, and the outer walls of the primary and secondary sealing plugs are respectively provided with a plurality of rubber sealing rings. The primary sealing plug forms the first line of defense, preventing other powder materials in the connecting cylinder from entering the sampling pipe during sampling and production. Based on the primary sealing plug, the secondary sealing plug works in conjunction with the primary sealing plug to form a double line of defense, ensuring that the collected sample can accurately reflect the characteristics of the powder. The rubber sealing rings on the outer walls of the primary and secondary sealing plugs enhance the sealing performance and resist corrosive media, extending the service life of the sampling device.

[0009] Preferably, the connecting rod is integrally provided with a wide-diameter section, the outer diameter of which is adapted to the inner diameter of the sampling pipe, and the sampling groove is located between the primary sealing plug and the wide-diameter section. The wide-diameter section also has a certain guiding and sealing function, which can make the movement of the connecting rod more reliable.

[0010] Preferably, a connecting part is integrally provided on one side of the connecting cylinder, the inner side of the sampling pipe is connected to the connecting part, and a pressure plate is fixed to the outer wall of the sampling pipe. The pressure plate is connected to the connecting part by screws. The connecting part, in conjunction with the pressure plate, enables detachable assembly of the sampling pipe and the connecting cylinder, facilitating the replacement of the rubber sealing ring.

[0011] Preferably, the sampling groove has a length of 25±2mm, a width of 10±2mm, and a depth of 5±1mm. By reasonably controlling the above dimensions of the sampling groove, the sampling weight of the powder sample to be tested can be controlled at 8-10g / time, so as to reduce sample waste and save sampling costs.

[0012] Compared with the prior art, the present invention has the following advantages: The sintered NdFeB airflow mill powder sampling device of the present invention is a suitable airflow mill powder sampling device for the sintered NdFeB grain refinement process. It adopts an innovative structural design. By setting a sealing mechanism on the connecting rod, the inner side of the sampling pipe can be sealed after the sampling groove enters the sampling pipe, preventing other powders in the connecting cylinder from entering the sampling pipe during sampling and production. This avoids the influence of powder cross-contamination on the test values ​​of the powder sample, so that the collected sample can truly reflect the powder characteristics and provide reliable powder particle size data support for the quality control and optimization of the sintered NdFeB grain refinement process. Attached Figure Description

[0013] Figure 1 This is an external view of the sintered NdFeB airflow mill powder sampling device in the embodiment;

[0014] Figure 2 This is a side view of the sintered NdFeB airflow mill powder sampling device in the embodiment;

[0015] Figure 3 This is a cross-sectional view of the sintered NdFeB airflow mill powder sampling device in the embodiment;

[0016] The specific reference numerals in the figure are as follows:

[0017] 1-Connecting cylinder, 11-Connecting part, 2-Sampling pipe, 21-Pressure plate, 3-Connecting rod, 31-Sampling groove, 32-Wide diameter section, 4-Handle, 5-Ball valve, 6-Nitrogen filling port, 7-Primary sealing plug, 8-Secondary sealing plug, 9-Rubber sealing ring. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] The sintered NdFeB airflow mill powder sampling device of the embodiment, such as Figures 1-3As shown, the device includes a connecting cylinder 1, a sampling pipe 2, a connecting rod 3, and a handle 4. The connecting cylinder 1 is located at the discharge position of the air jet mill (not shown in the figure). The inner side of the sampling pipe 2 is connected to the connecting cylinder 1. The sampling pipe 2 is equipped with a ball valve 5 and a nitrogen filling port 6. A sampling groove 31 is opened on the side wall of the connecting rod 3. The outlet of the ball valve 5 is the discharge port of the powder sampled by the sampling groove 31. The connecting rod 3 passes through the sampling pipe 2. One end of the connecting rod 3 is equipped with a sealing mechanism. The other end of the connecting rod 3 is connected to the handle 4. The handle 4 is used to drive the connecting rod 3 to rotate or to drive the connecting rod 3 to move axially along the sampling pipe 2. The sealing mechanism is used to seal the inner side of the sampling pipe 2 after the sampling groove 31 enters the sampling pipe 2.

[0020] In this embodiment, the sealing mechanism includes a primary sealing plug 7 and a secondary sealing plug 8, which are spaced apart inside the sampling groove 31. The outer diameters of the primary sealing plug 7 and the secondary sealing plug 8 are respectively adapted to the inner diameter of the sampling pipe 2. The outer walls of the primary sealing plug 7 and the secondary sealing plug 8 are respectively provided with a plurality of rubber sealing rings 9. A wide diameter section 32 is integrally provided on the connecting rod 3. The outer diameter of the wide diameter section 32 is adapted to the inner diameter of the sampling pipe 2. The sampling groove 31 is located between the primary sealing plug 7 and the wide diameter section 32.

[0021] In this embodiment, a connecting part 11 is integrally provided on one side of the connecting cylinder 1, the inner side of the sampling pipe 2 is connected to the connecting part 11, and a pressure plate 21 is fixed on the outer wall of the sampling pipe 2. The pressure plate 21 is connected to the connecting part 11 by screws 22.

[0022] In this embodiment, the sampling groove 31 has a length of 25mm, a width of 10mm, and a depth of 5mm, which can control the weight of a single sampling of the powder sample to be tested to 8-10g, thereby reducing sample waste and saving sampling costs.

[0023] When using the above-mentioned sampling device, operating the handle 4 will cause the connecting rod 3 to rotate or move axially. After sampling the powder sample in the sampling trough 31, pulling the connecting rod 3 will cause the sampling trough 31 to enter the sampling pipe 2 and approach the ball valve 5. After the sampling trough 31 enters the sampling pipe 2, the primary sealing plug 7 and the secondary sealing plug 8 will seal the sampling pipe 2. At this time, the ball valve 5 can be opened to allow the powder sample to be output from the outlet of the ball valve 5. During the above sampling process, high-purity nitrogen gas is introduced into the sampling device through the nitrogen filling port 6 to prevent powder oxidation. The high-purity nitrogen gas creates positive pressure in the sampling pipe 2 to ensure smooth sampling of the powder sample.

Claims

1. A sampling device for sintered NdFeB airflow mill powder, characterized in that, The device includes a connecting cylinder, a sampling pipe, a connecting rod, and a handle. The connecting cylinder is located at the discharge position of the air jet mill. The inner side of the sampling pipe is connected to the connecting cylinder. The sampling pipe is equipped with a ball valve and a nitrogen filling port. A sampling groove is formed on the side wall of the connecting rod. The outlet of the ball valve is the discharge port of the powder sampled by the sampling groove. The connecting rod passes through the sampling pipe. One end of the connecting rod is equipped with a sealing mechanism. The other end of the connecting rod is connected to the handle. The handle is used to drive the connecting rod to rotate or to drive the connecting rod to move axially along the sampling pipe. The sealing mechanism is used to seal the inner side of the sampling pipe after the sampling groove enters the sampling pipe.

2. The sintered NdFeB airflow mill powder sampling device according to claim 1, characterized in that, The sealing mechanism includes a primary sealing plug and a secondary sealing plug, which are spaced apart inside the sampling groove. The outer diameters of the primary and secondary sealing plugs are respectively adapted to the inner diameter of the sampling pipe, and the outer walls of the primary and secondary sealing plugs are respectively provided with a plurality of rubber sealing rings.

3. The sintered NdFeB airflow mill powder sampling device according to claim 2, characterized in that, The connecting rod is integrally provided with a wide diameter section, the outer diameter of which is adapted to the inner diameter of the sampling pipe, and the sampling groove is located between the primary sealing plug and the wide diameter section.

4. The sintered NdFeB airflow mill powder sampling device according to claim 2, characterized in that, A connecting part is integrally provided on one side of the connecting cylinder, the inner side of the sampling pipe is connected to the connecting part, a pressure plate is fixed on the outer wall of the sampling pipe, and the pressure plate is connected to the connecting part by screws.

5. The sintered NdFeB airflow mill powder sampling device according to claim 1, characterized in that, The sampling groove has a length of 25±2mm, a width of 10±2mm, and a depth of 5±1mm.

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