Airflow classifier for soft magnetic powder

Abstract

The invention discloses an airflow classifier for soft magnetic powder, which comprises an elevated tower, an airflow classifier, a dust removal screening machine and a pulse dust remover which are sequentially connected are fixedly arranged on the elevated tower, and a magnetic separation mechanism is arranged in the airflow classifier and / or the dust removal screening machine. A magnetism reducing mechanism is correspondingly arranged on a pipeline between the airflow classifier and the dust removal screening machine and / or a pipeline between the dust removal screening machine and the pulse dust remover, the magnetism reducing mechanism disperses soft magnetic powder blocks entering the tower bodies, and the magnetism reducing mechanism reduces the magnetic force of the soft magnetic powder which is transmitted between the tower bodies and is influenced. Agglomerated soft magnetic powder blocks are dispersed and refined through the scattering device in the mode that physical direct throwing and beating are combined with magnetic field influences, the screening quality is improved, the product purity is improved, and the follow-up screening pressure is reduced; and in order to prevent adverse effects on the soft magnetic powder subsequently, the eliminator is used for reducing magnetism, so that the quality of the soft magnetic powder is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of soft magnetic powder preparation, and more particularly to an air flow classifier for soft magnetic powder. Background Art

[0002] Soft magnetic powder is a material characterized by high saturation magnetic induction, low coercivity, low high-frequency loss, and excellent rust resistance. It is widely used in power electronics and directly impacts the quality and reliability of inductor components. Soft magnetic powder itself is the subject of focused research on its preparation process, particle size, oxygen content, and morphology. Soft magnetic powder is usually alloy powder. It is known that industrial pure iron with a purity greater than 99.9%, industrial silicon with a purity greater than 99.5%, metallic chromium with a purity greater than 99.9%, and electrolytic manganese with a purity greater than 99.7% are commonly used as raw materials to prepare FeSiCr soft magnetic alloy powder. The raw materials are placed in a medium-frequency induction furnace for melting according to the ratio and heated to 1500~1700℃ to fully alloy the molten steel. The molten steel is then poured into a tundish and enters the combined atomization system through the bottom leakage hole. It is broken into metal liquid by 100~120MPa high-pressure water impact and rapidly cooled and solidified into alloy powder. The atomized powder is dehydrated, dried and other processes to produce soft magnetic powder alloy powder of different particle sizes. After the final screening, products of corresponding classification grades are obtained.

[0003] Due to the particularity of soft magnetic powder, during the screening process, friction, ambient temperature and other factors cause particles of different sizes to attract and cluster together. There is also agglomeration and adhesion of different types of powders. Conventional air-inducing methods are difficult to directly intervene in the separation. This will result in the actual screening of not single particles, which not only affects the quality of product classification, but even causes great damage to the finished product structure, and also affects the product purity, directly affecting the performance of subsequent finished products. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide an air flow classifier for soft magnetic powder to solve one or more of the above problems.

[0005] To achieve the above object, the present invention provides the following technical solutions: An air flow classifier for soft magnetic powder comprises an elevated tower, on which an air flow classifier, a dust removal and screening machine and a pulse dust collector connected in sequence are fixedly arranged; a magnetic separation mechanism is provided in the air flow classifier and / or the dust removal and screening machine; a demagnetization mechanism is correspondingly provided on the pipeline between the air flow classifier and the dust removal and screening machine and / or on the pipeline between the dust removal and screening machine and the pulse dust collector; the magnetic separation mechanism disperses soft magnetic powder agglomerates entering the tower body; the demagnetization mechanism reduces the magnetic force of the soft magnetic powder that has been transmitted and affected between the tower bodies.

[0006] Furthermore, the magnetic separation mechanism includes two mounting seats fixed inside the corresponding tower bodies, a hollow connecting rod and a scatterer, the connecting rod is connected to the scatterer, and the scatterer is rotatably arranged on the mounting seat through the connecting rod. An energized coil is provided in the scatterer, and an electric wire is passed through the connecting rod, and the electric wire is electrically connected to the energized coil.

[0007] Furthermore, the energized coil is an AC coil, and the threading rod and the scrambler rotate synchronously.

[0008] Furthermore, the scatterer is an asymmetrical pyramid structure, and the energized coils at the upper and lower parts of the scatterer move in opposite directions.

[0009] Furthermore, the demagnetization mechanism includes a butt joint tube, a demagnetization tube and an eliminator. The butt joint tube is connected to the discharge air duct of the upper tower body. One end of the demagnetization tube is connected to the butt joint tube and the other end is connected to the feed air duct of the next tower body. The eliminator is distributed inside the demagnetization tube.

[0010] Furthermore, the butt joint tube is a circular tube structure, the front end of the magnetic reduction tube is a circular tube structure, the rear end of the magnetic reduction tube is a square tube structure, and the middle section of the magnetic reduction tube is a prismatic structure.

[0011] Furthermore, the eliminator is distributed in the middle section of the demagnetization tube, one end of the eliminator forms a complete circular ring structure, and the other end of the eliminator converges and extends to the rear end node of the demagnetization tube.

[0012] Furthermore, the top of the tower body of the dust removal and screening machine is a rotating feed air duct structure, the bottoms of the air flow classifier and the dust removal and screening machine are each separately provided with a discharge tank with a pneumatic butterfly valve, and the bottom of the pulse dust collector is provided with a discharge straight pipe with a pneumatic butterfly valve.

[0013] Furthermore, the feed air inlet of the air flow classifier is arranged at the lower end of the tower body, and a corresponding discharge air inlet is also opened at the upper end of the tower body; the feed air inlet of the dust removal and screening machine is arranged on the top side of the tower body, and a discharge air inlet is also opened on the top surface of the tower body. The pulse dust collector is provided with a feed air inlet at the bottom top and a dust exhaust air inlet at the top of the tower body. The air flow classifier and the dust removal and screening machine are both cylindrical tower bodies, and the pulse dust collector is a square column tower body.

[0014] Furthermore, a vortex blade grading module is provided in the air flow classifier, the magnetic classification mechanism is located below the vortex blade grading module, a pleated bag filter and a matching vibrator are provided at the upper end of the pulse dust collector, and a motor matching the vibrator is provided outside the pulse dust collector.

[0015] In summary, the present invention has the following beneficial effects: the united soft magnetic powder blocks are dispersed and refined by a shatterer through direct physical beating combined with the influence of a magnetic field, thereby improving the screening quality, increasing the product purity, and reducing the pressure of subsequent screening; in order to prevent adverse effects on the soft magnetic powder, the eliminator is used to reduce the magnetism and ensure the quality of the soft magnetic powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 An exploded view of an air flow classifier according to an embodiment of the present invention; Figure 3 A schematic structural diagram of a dust removal and screening machine tower body according to an embodiment of the present invention; Figure 4 A schematic structural diagram of a pulse dust collector according to an embodiment of the present invention; Figure 5 A schematic structural diagram of a demagnetization mechanism in one embodiment of the present invention; Figure 6 A schematic structural diagram of a scatterer according to an embodiment of the present invention.

[0017] In the figure: 10, elevated tower; 20, air flow classifier; 21, vortex blade classifier module; 30, dust removal and screening machine; 40, pulse dust collector; 50, magnetic separation mechanism; 51, connecting rod; 52, scatterer; 60, magnetic reduction mechanism; 61, connecting pipe; 62, magnetic reduction pipe; 70, discharge tank; 71, discharge straight pipe. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-6 The present invention is described in further detail. Example

[0019] An air flow classifier 20 for soft magnetic powder, such as Figure 1 As shown, the main body is the airflow classifier 20, dust screening machine 30 and pulse dust collector 40 connected in sequence by pipelines. The three main tower bodies are fixed on the elevated tower 10. The elevated tower 10 is equipped with common components or structures such as stairs, handrails, lighting, alarm equipment, reinforcement frames, etc. to meet daily production needs. Figure 2 As shown, a downward feed air port is provided at the lower left of the air classifier 20, and a discharge air port is provided at the upper end of the air classifier 20, which is biased toward the rear. A magnetic separation mechanism 50 and a vortex blade classification module 21 are provided inside the air classifier 20. The magnetic separation mechanism 50 is provided below the vortex blade classification module 21 to ensure that the magnetic separation mechanism 50 has priority contact with the soft magnetic powder being transmitted; Figure 3As shown, the top of the tower body of the dust removal and screening machine 30 is a rotating feed air duct structure with a certain rotation trend. Therefore, the discharge air outlet at the top of the air flow classifier 20 needs to be adjusted in accordance with the rotation direction in order to dock well. The feed air outlet should be set at the top of the side of the tower body, and the discharge air outlet should be set at the top of the tower body; Figure 4 As shown, a feed air inlet is provided at the bottom of the pulse dust collector 40, and a pleated bag filter is provided in the main area at the upper end of the interior of the pulse dust collector 40. After being blown by the wind, the bag filter can be inflated and absorb impurity dust with a smaller particle size than the soft magnetic powder. A dust exhaust air outlet is provided on the right side of the top of the pulse dust collector 40 for subsequent discharge of impurity dust inside. The bag filter is connected to a vibrator to assist in shaking, and a matching motor is installed on the top of the pulse dust collector 40. The setting of the motor cannot hinder the normal laying of the pipeline. The pipeline between the airflow classifier 20 and the dust removal and screening machine 30 is correspondingly provided with a demagnetization mechanism 60. The bottom of the airflow classifier 20 and the dust removal and screening machine 30 are each provided with a separate discharge tank 70 with a pneumatic butterfly valve for discharging the powder; the bottom of the pulse dust collector 40 is provided with a straight discharge pipe 71 with a pneumatic butterfly valve for direct discharge. The airflow classifier 20 and the dust removal and screening machine 30 are both cylindrical towers, which are convenient for the flying of powder; the pulse dust collector 40 is a rectangular column, which is convenient for the vibration of the bag filter.

[0020] like Figure 5 As shown, the magnetic separator 50 breaks up the soft magnetic powder entering the air classifier 20 and any clumps that may have formed due to factors such as temperature and attraction. The magnetic separator 50 comprises two horizontally aligned mounting blocks fixed within the tower body, with a demagnetizer 52 secured to a connecting rod 51. The connecting rod 51 is hollow, facilitating power supply and signal control. The demagnetizer 52 is rotatably mounted to the mounting blocks via the connecting rod 51, and the connecting rod and demagnetizer 52 rotate synchronously. The demagnetizer 52 is internally provided with an AC coil, with the upper and lower coils of the demagnetizer 52 moving in opposite directions. The wires are electrically connected to the AC coil. The demagnetizer 52 has a bilaterally symmetrical pyramidal structure, creating a corresponding bilaterally symmetrical magnetic field. The demagnetization mechanism 60 demagnetizes the magnetically separated soft magnetic powder that is transferred from the air classifier 20 to the dust removal and screening machine 30. The demagnetization mechanism 60 comprises a connecting pipe 61, a demagnetization tube 62, and an eliminator. The butt joint pipe 61 is a circular tube structure, and the demagnetization pipe 62 is divided into three integrated sections. The front end is a circular tube structure that matches the butt joint pipe 61; the middle section is a prismatic structure that smoothly transitions from a circular tube to a square tube; and the rear end is a square tube structure that connects to the subsequent tower body air outlet. The butt joint pipe 61 connects to the discharge air outlet of the air flow classifier 20, and the demagnetization pipe 62 connects to the butt joint pipe 61 and the feed air outlet of the pulse dust collector 40. The eliminator is arranged in a contracting manner inside the middle section of the demagnetization pipe 62. The side ends of the front section of the eliminator form a complete closed structure, and the other end gradually converges to the four nodes at the rear end of the demagnetization pipe 62.

[0021] The raw soft magnetic powder product is introduced from the outside and introduced into the air flow classifier 20 through the feed air port. The scatterer 52 is driven by a motor to rotate and energize, forming magnetism. The introduced soft magnetic powder is first physically broken up by contact, and then further separated to the particle level by the magnetic field. It passes upward through the vortex blade classification module, and is further sorted by contact and horizontal rotation. It is then transmitted through the pipeline through a DC demagnetizer to reasonably eliminate the magnetic force carried by the soft magnetic powder due to the magnetic field of the scatterer 52. The minimum requirement is that it should not affect the subsequent use of the soft magnetic powder. The entire special shrinkage distribution method can more gently demagnetize and ensure the quality of the soft magnetic powder. It enters the dust removal and screening machine 30 from the cyclonic feed air port for cyclonic separation, completing two-stage classification and screening, and finally enters the pulse dust collector 40 for dust removal, resulting in a more detailed classification of soft magnetic powder products. Example

[0022] The difference from Example 1 is that the magnetic separation mechanism 50 is transferred from the air flow classifier 20 to the dust removal and screening machine 30, and the corresponding magnetic reduction mechanism 60 is also transferred to the connecting pipeline between the dust removal and screening machine 30 and the pulse dust collector 40. The relevant pipelines need to be adaptively adjusted, especially the motor outside the pulse dust collector 40, and its installation position cannot affect the normal function and operation of the variable components. Example

[0023] The difference from Example 1 is that an additional magnetic separation mechanism 50 is set up in the dust removal and screening machine 30, and the corresponding demagnetization mechanism 60 is also needed on the connecting pipeline between the dust removal and screening machine 30 and the pulse dust collector 40. The relevant pipelines need to be adaptively adjusted, especially the motor outside the pulse dust collector 40, and its installation position cannot affect the normal function and operation of the variable parts. Example

[0024] The difference from Example 1 is that Figure 6 As shown, the scatterer 52 of the magnetic separation mechanism 50 is a structure that is flat on the top and long on the bottom and symmetrical on the left and right, so that a separation magnetic field that is divided into upper and lower parts can be formed to perform a two-stage dispersion process on the soft magnetic powder. Example

[0025] The difference from Example 1 is that the scatterer 52 of the magnetic separation mechanism 50 is a completely symmetrical structure, so that a uniform separation magnetic field can be formed around the scatterer 52 to perform a single-mode dispersion treatment on the soft magnetic powder. Example

[0026] The difference from Example 1 is that the scrambler 52 of the magnetic separation mechanism 50 is a completely asymmetric structure, so that a more complex and diverse separation magnetic field can be formed around the scrambler 52. Theoretically, the separation effect of this embodiment is optimal, but this specific magnetic field distribution has a high probability of affecting the soft magnetic powder itself, and requires more detailed design and guidance of the magnetic field distribution, and a reasonable trade-off between optimizing the dispersion effect and the objective adverse effects on the soft magnetic powder. Example

[0027] The difference from Example 1 is that the mounting seats for the scatterer 52 and the connecting rod 51 in the air flow classifier 20 are arranged at inconsistent heights. With respect to the route of the soft magnetic powder blowing and conveying, the magnetic field is relatively offset, which actually also has the effect of changing the relative distribution of the magnetic field.

[0028] It should be noted that this specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An air flow classifier for soft magnetic powder, comprising an elevated tower (10), characterized in that: An airflow classifier (20), a dust removal and screening machine (30) and a pulse dust collector (40) connected in sequence are fixedly provided on the elevated tower (10). A magnetic separation mechanism (50) is provided in the airflow classifier (20) and / or the dust removal and screening machine (30). A demagnetization mechanism (60) is correspondingly provided on the pipeline between the airflow classifier (20) and the dust removal and screening machine (30) and / or on the pipeline between the dust removal and screening machine (30) and the pulse dust collector (40). The magnetic separation mechanism (50) disperses soft magnetic powder agglomerates entering the tower body, and the demagnetization mechanism (60) reduces the magnetic force of the soft magnetic powder that is transmitted between the tower bodies and is affected.

2. The air flow classifier for soft magnetic powder according to claim 1, characterized in that: The magnetic separation mechanism (50) includes two mounting seats fixed inside the corresponding tower bodies, a hollow connecting rod (51) and a scatterer (52), wherein the connecting rod (51) is connected to the scatterer (52), and the scatterer (52) is rotatably arranged on the mounting seat through the connecting rod (51), and an energized coil is arranged in the scatterer (52), and an electric wire is passed through the connecting rod (51), and the electric wire is electrically connected to the energized coil.

3. The air flow classifier for soft magnetic powder according to claim 2, wherein: The energized coil is an AC coil, and the connecting rod (51) and the scatterer (52) rotate synchronously.

4. The air flow classifier for soft magnetic powder according to claim 2, wherein: The scatterer (52) is an asymmetrical pyramid structure, and the energized coils at the upper and lower parts of the scatterer (52) move in opposite directions.

5. The air flow classifier for soft magnetic powder according to claim 1, wherein: The demagnetization mechanism (60) comprises a butt joint pipe (61), a demagnetization tube (62) and an eliminator. The butt joint pipe (61) is connected to the discharge air duct of the upper tower body. One end of the demagnetization tube (62) is butt jointed with the butt joint pipe (61) and the other end is butt jointed with the feed air duct of the lower tower body. The eliminator is distributed inside the demagnetization tube (62).

6. The air flow classifier for soft magnetic powder according to claim 5, characterized in that: The butting tube (61) is a circular tube structure, the front end of the magnetic reduction tube (62) is a circular tube structure, the rear end of the magnetic reduction tube (62) is a square tube structure, and the middle section of the magnetic reduction tube (62) is a prismatic structure.

7. The air flow classifier for soft magnetic powder according to claim 6, characterized in that: The eliminator is distributed in the middle section of the demagnetization tube (62), one end of the eliminator forms a complete circular ring structure, and the other end of the eliminator converges and extends to the rear end node of the demagnetization tube (62).

8. The air flow classifier for soft magnetic powder according to claim 1, characterized in that: The top of the tower body of the dust removal and screening machine (30) is a rotating feed air duct structure, the bottoms of the airflow classifier (20) and the dust removal and screening machine (30) are each independently provided with a discharge tank (70) with a pneumatic butterfly valve, and the bottom of the pulse dust collector (40) is provided with a discharge straight pipe (71) with a pneumatic butterfly valve.

9. The air flow classifier for soft magnetic powder according to claim 1, characterized in that: The feed air inlet of the air flow classifier (20) is arranged at the lower end of the tower body, and a corresponding discharge air inlet is also opened at the upper end of the tower body; the feed air inlet of the dust removal and screening machine (30) is arranged on the side of the top of the tower body, and a discharge air inlet is also opened on the top surface of the tower body; the pulse dust collector (40) is provided with feed air inlets at the bottom of the top and dust exhaust air inlets at the top of the tower body; the air flow classifier (20) and the dust removal and screening machine (30) are both cylindrical tower bodies, and the pulse dust collector (40) is a square column tower body.

10. The air flow classifier for soft magnetic powder according to claim 9, characterized in that: A vortex blade classification module (21) is provided in the airflow classifier (20), the magnetic classification mechanism (50) is located below the vortex blade classification module, a pleated bag filter and a matching vibrator are provided at the upper end of the interior of the pulse dust collector (40), and a motor matching the vibrator is provided outside the pulse dust collector (40).

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