Metal soft magnetic powder screening device

Abstract

The invention provides a metal soft magnetic powder screening device, and belongs to the technical field of soft magnetic powder screening, the metal soft magnetic powder screening device comprises a filter barrel, a filter screen, an ultrasonic generator and two types of magnetic separation devices, a containing cavity is arranged in the filter barrel, the filter screen is arranged in the containing cavity and divides the containing cavity into an upper cavity and a lower cavity which are communicated with each other, and the upper cavity and the lower cavity are communicated with each other. The upper chamber is used for introducing a dispersion solution and metal soft magnetic powder, the ultrasonic generator is used for dispersing the metal soft magnetic powder in a mixed solution in the upper chamber and on the filter screen, and one type of magnetic separation device is connected with the bottom side of the lower chamber; the magnetic separation device generates magnetic attraction force to adsorb metal soft magnetic powder with the particle size smaller than the aperture of the filter screen in the mixed solution flowing out of the lower cavity, the other magnetic separation device is connected with the bottom side of the upper cavity, and the magnetic separation device generates magnetic attraction force to adsorb metal soft magnetic powder with the particle size not smaller than the aperture of the filter screen in the mixed solution flowing out of the upper cavity. The superfine metal soft magnetic powder can be efficiently separated from the metal soft magnetic powder.

Description

Technical Field

[0001] The invention relates to the technical field of soft magnetic powder screening, in particular to a metal soft magnetic powder screening device. Background Art

[0002] Soft magnetic materials can be roughly divided into ferrite soft magnetic materials, metal soft magnetic materials, and amorphous / nanocrystalline soft magnetic materials. They can not only be used to make various types of soft magnetic powder cores, but also to manufacture electronic components such as transformers and inductors. Among them, ultrafine metal soft magnetic powders are widely used in life and production because they not only have the characteristics of classic soft magnetic materials that are easy to magnetize and demagnetize, but also show the characteristics of a sharp decrease in eddy current loss under high frequency conditions.

[0003] In order to obtain ultrafine metal soft magnetic powder, it is necessary to use corresponding devices to screen the prepared metal soft magnetic powder. At present, vibrating screens and airflow separators are generally used. However, due to the small particle size of ultrafine metal soft magnetic powder, it is easy to agglomerate and difficult to disperse. Therefore, when using a vibrating screen for screening, these powders are very easy to clog the screen of the vibrating screen during the screening process, resulting in low screening efficiency and difficulty in achieving accurate particle size control. When using an airflow separator for screening, the airflow separator needs to have an excellent performance grading impeller structure and flow field design to screen out ultrafine metal soft magnetic powder with high grading accuracy and collection efficiency, which limits its processing capacity. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a metal soft magnetic powder screening device, aiming to efficiently separate ultrafine metal soft magnetic powder from metal soft magnetic powder.

[0005] To achieve the above-mentioned purpose, the present invention provides a metal soft magnetic powder screening device, comprising a filter barrel, a filter screen, an ultrasonic generator, and two types of magnetic separation devices. A accommodating chamber is provided in the filter barrel, the filter screen is arranged in the accommodating chamber, and the accommodating chamber is divided into an upper chamber and a lower chamber which are interconnected. The upper chamber is used for introducing a dispersed solution and metal soft magnetic powder, and the ultrasonic generator is used for dispersing the metal soft magnetic powder in the mixed solution in the upper chamber and on the filter screen. One type of magnetic separation device is connected to the bottom side of the lower chamber, and the magnetic separation device generates a magnetic attraction to adsorb the metal soft magnetic powder whose particle size is smaller than the filter screen aperture in the mixed solution flowing out of the lower chamber, and the other type of magnetic separation device is connected to the bottom side of the upper chamber, and the magnetic separation device generates a magnetic attraction to adsorb the metal soft magnetic powder whose particle size is not smaller than the filter screen aperture in the mixed solution flowing out of the upper chamber.

[0006] In addition, the above-mentioned metal soft magnetic powder screening device according to the present invention may also have the following additional technical features:

[0007] Furthermore, the metal soft magnetic powder screening device also includes an electromagnetism device, which generates a magnetic field in the lower chamber in the direction of the mixed solution flowing therein.

[0008] Furthermore, an ultrasonic generator is provided on the side wall of the upper chamber and / or on the filter screen.

[0009] Furthermore, the metal soft magnetic powder screening device also includes a gas blowing device, which generates a gas flow when a preset condition is met to disperse the agglomerated metal soft magnetic powder on the filter screen.

[0010] Furthermore, the gas dispersing device is arranged at the center of the filter screen and generates a gas flow radiating to the surroundings thereof.

[0011] Furthermore, the metal soft magnetic powder screening device also includes a weight detection device, which is used to obtain the weight of the metal soft magnetic powder on the filter screen, and when the weight of the metal soft magnetic powder on the filter screen exceeds a preset value, the gas blowing device generates a gas flow.

[0012] Furthermore, the magnetic separation device comprises a box body and a magnetic roller. The magnetic roller is rotatably arranged in the box body, and a water inlet is arranged on the upper side of the box body.

[0013] Furthermore, a water outlet is provided on the lower side of the box body, and the metal soft magnetic powder screening device also includes a water supply device, the input end of the water supply device is connected to the water outlet, and the output end of the water supply device is connected to the upper chamber to re-introduce the mixed solution in the magnetic separation device into the upper chamber.

[0014] Furthermore, a discharge port is provided at the bottom of the box body, and the metal soft magnetic powder screening device also includes a collecting device, which is connected to the discharge port.

[0015] Furthermore, the collecting device comprises a collecting box and a material guide plate, one end of the material guide plate can extend into the material outlet and abut against the wall surface of the magnetic roller, and the other end of the material guide plate can extend into the collecting box.

[0016] The beneficial effects of the present invention include at least: the present invention uses a dispersed solution to transport metal soft magnetic powder, and uses ultrasonic waves to act on the mixed solution containing the powder, so that the metal soft magnetic powder is not easily oxidized and agglomerated. At the same time, through the design of the discharge ports of the upper and lower chambers of the filter screen and the filter barrel, the mixed solution containing coarse powder and ultrafine powder can be transmitted to different magnetic separation devices, thereby efficiently completing the screening operation of the metal soft magnetic powder. Compared with the prior art, the screening is efficient, and the overall structure is simple and easy to control; at the same time, the high magnetic properties of the metal soft magnetic powder are utilized, and the magnetic field is specially designed to control the rapid gathering of ultrafine powder, so as to avoid the collection of ultrafine powder affected by the coarse powder discharge process and the action of the gas blowing device; in addition, the dispersed solution is reused by a water delivery device to avoid waste of resources and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0018] Description of main component symbols:

[0019] Filter barrel 100, accommodating chamber 110, upper chamber 111, lower chamber 112, filter screen 200, ultrasonic generator 300, magnetic separation device 400, box body 410, water inlet 411, water outlet 412, material outlet 413, magnetic roller 420, electromagnetism device 500, gas dispersing device 600, weight detection device 700, water delivery device 800, collection device 900, collection box 910, material guide plate 920;

[0020] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] Please refer to Figure 1, is a schematic diagram of the structure of a metal soft magnetic powder screening device provided by the present invention, the metal soft magnetic powder screening device comprises a filter barrel 100, a filter screen 200, an ultrasonic generator 300, and two types of magnetic separation devices 400 (400a, 400b), and a containing chamber 110 is provided in the filter barrel 100 to contain the metal soft magnetic powder. The filter screen 200 is installed and fixed on the side wall of the containing chamber 110, so as to separate the containing chamber 110 into an upper chamber 111 and a lower chamber 112 which are interconnected, and the aperture of the filter screen 200 matches the particle size of the ultrafine metal soft magnetic powder to be obtained. When in use, the dispersion solution and the metal soft magnetic powder are added to the upper chamber 111, and optionally, the dispersion solution can be a solution with low viscosity such as water and anhydrous ethanol. On the one hand, the dispersion solution can produce a certain degree of dispersion effect on the metal soft magnetic powder, and can prevent the metal soft magnetic powder from being exposed to the air and oxidized.

[0025] The ultrasonic generator 300 generates sound waves with a frequency exceeding 20 khz, which cause the mixed solution in the upper chamber 111 to vibrate, thereby dispersing the metal soft magnetic powders agglomerated in the mixed solution, wherein the metal soft magnetic powders with a particle size smaller than the aperture of the filter screen 200 can quickly pass through the filter screen 200 and flow into the lower chamber 112 by virtue of the vibration of the solution and the action of gravity. At the same time, the sound waves generated by the ultrasonic generator 300 can also cause the solution near the surface of the filter screen 200 to vibrate, and cause the filter screen 200 to vibrate, so that the metal soft magnetic powders agglomerated on the filter screen 200 can be dispersed, and the metal soft magnetic powders with larger particle sizes can be vibrated, thereby preventing the metal soft magnetic powders from clogging the filter screen 200, and ensuring that the metal soft magnetic powders with a particle size smaller than the aperture of the filter screen 200 can pass through the filter screen 200 smoothly.

[0026] The magnetic separation device 400a is connected to the bottom side of the lower chamber 112. When working, the magnetic separation device 400a generates magnetic attraction, and the metal soft magnetic powder with a particle size smaller than the aperture of the filter 200 in the mixed solution flowing out of the lower chamber 112 is adsorbed by the magnetic attraction. It should be noted that, in order to allow the mixed solution in the lower chamber 112 to flow into the magnetic separation device 400a, an opening is provided on the bottom side of the lower chamber 112, and an inlet is correspondingly provided on the magnetic separation device 400a, and the opening of the lower chamber 112 is sealed and connected to the inlet of the magnetic separation device 400a through a connecting device, and the connection between the two can be controlled to open and close, so that when collecting metal soft magnetic powder with a particle size smaller than the aperture of the filter 200, the mixed solution in the accommodating chamber 110 is made to exceed the filter 200 by a certain height, so that the ultrasonic generator 300 can produce a dispersion effect.

[0027] The magnetic separation device 400b is connected to the bottom side of the upper chamber 111. When working, the magnetic separation device 400b generates a magnetic attraction force, and the metal soft magnetic powder with a particle size not less than the aperture of the filter 200 in the mixed solution flowing out of the upper chamber 111 is adsorbed by the magnetic attraction force. It should be noted that in order to allow the mixed solution in the upper chamber 111 to flow into the magnetic separation device 400b, an opening is set on the bottom side of the upper chamber 111, and the opening is set close to the filter 200 to prevent some metal soft magnetic powder with a particle size not less than the aperture of the filter 200 from remaining on the filter 200. Correspondingly, an inlet is set on the magnetic separation device 400b, and the opening of the lower chamber 112 is sealed and connected to the inlet of the magnetic separation device 400a through a connecting device. Optionally, the connection between the two can be controlled by opening and closing, or not. Preferably, the connection between the two is opened and closed to control the metal soft magnetic powder with a particle size smaller than the aperture of the filter 200 to be screened as much as possible by the filter 200, so as to prevent some metal soft magnetic powder with a particle size smaller than the aperture of the filter 200 from flowing into the magnetic separation device 400b, thereby improving the screening efficiency.

[0028] In this embodiment, the dispersed solution and the metal soft magnetic powder are first mixed to prevent oxidation and use the solution to drive the metal soft magnetic powder to flow and disperse. Then, the mixed solution is vibrated by the ultrasonic generator 300 to prevent the metal soft magnetic powder from agglomerating and the filter 200 from being blocked. Finally, the metal soft magnetic powder with a particle size smaller than the aperture of the filter 200 is collected by the magnetic separation device 400a, which is the desired ultrafine metal soft magnetic powder.

[0029] In some optional embodiments, such as Figure 1 As shown, the metal soft magnetic powder screening device also includes an electromagnetism device 500, which can generate a magnetic field in the lower chamber 112 along the flow direction of the mixed solution therein, and the magnetic field can be changed by adjusting the current. Since the metal soft magnetic powder has high magnetism, by setting a magnetic field, the metal soft magnetic powder smaller than the aperture of the filter screen 200 can be accelerated to pass through the filter screen 200, and quickly gathered to the outlet of the lower chamber 112 along the direction of the magnetic field, preventing the ultrafine metal soft magnetic powder from staying near the filter screen 200, or when the metal soft magnetic powder with a particle size not less than the aperture of the filter screen 200 is discharged into the magnetic separation device 400b, the ultrafine metal soft magnetic powder in the lower chamber 112 re-enters the upper chamber 111 due to liquid disturbance and is discharged into the magnetic separation device 400b. In addition, the size of the magnetic field generated by the electromagnetism device 500 is adjustable, so it can be adjusted accordingly according to factors such as the particle size of the metal soft magnetic powder, thereby changing the collection speed. Exemplarily, an electromagnetism device 500 is disposed on the outer wall of the lower chamber 112, and in order to better collect ultrafine metallic soft magnetic powder, the outlet of the lower chamber 112 is configured to be conical.

[0030] In some optional embodiments, an ultrasonic generator 300 is provided on the side wall of the upper chamber 111, or an ultrasonic generator 300 is provided on the filter 200, or an ultrasonic generator 300 is provided on both the side wall of the upper chamber 111 and the filter 200. In addition, the number of ultrasonic generators 300 can be reasonably set according to actual conditions.

[0031] In some optional embodiments, such as Figure 1 As shown, the metal soft magnetic powder screening device also includes a gas dispersing device 600, and the gas dispersing device 600 generates a gas flow when a preset condition is met. For example, a certain time interval can be set. After the time interval is completed, the gas dispersing device 600 generates a gas flow. The gas flow here is preferably an inert gas, such as nitrogen, to prevent the gas from oxidizing the metal soft magnetic powder. In this embodiment, due to the presence of the electromagnetism device 500, the ultrafine metal soft magnetic powder screened by the filter 200 can be quickly gathered to the outlet of the lower chamber 112 along the direction of the magnetic field to prevent the ultrafine metal soft magnetic powder from staying near the filter 200. In this way, when the gas flow is generated, the disturbance of the liquid will not cause the ultrafine metal soft magnetic powder in the lower chamber 112 to re-enter the upper chamber 111 and be discharged into the magnetic separation device 400b.

[0032] In this embodiment, the gas flow can impact the mixed solution and the metal soft magnetic powder, which can not only disperse the agglomerated metal soft magnetic powder on the filter screen 200, but also prevent the metal soft magnetic powder from clogging the filter screen 200. Moreover, under the thrust of the gas, the mixed solution is accelerated by the thrust, so that the mixed solution carries the metal soft magnetic powder with a particle size not less than the aperture of the filter screen 200 and is quickly discharged from the openings on both sides of the upper chamber 111. Of course, it is preferred that after the ultra-fine metal soft magnetic powder is screened as much as possible by the filter screen 200, the channel between the opening of the upper chamber 111 and the inlet of the magnetic separation device 400b is connected to prevent part of the ultra-fine metal soft magnetic powder from being discharged into the magnetic separation device 400b under the action of the airflow. In addition, preferably, the gas dispersing device 600 is arranged at the center of the filter screen 200, and generates a gas flow radiating around it, so that the force of the airflow acting on the mixed solution is more evenly distributed, which is conducive to the orderly discharge of the coarse powder into the magnetic separation device 400b.

[0033] In some optional embodiments, such as Figure 1 As shown, the metal soft magnetic powder screening device also includes a weight detection device 700, such as a mass sensor, which is used to obtain the weight of the metal soft magnetic powder on the filter screen 200 and transmit it to the control system, and the control system is electrically connected to the weight detection device 700. When the control system obtains that the weight of the metal soft magnetic powder detected by the weight detection device 700 exceeds a preset value, the control system controls the gas blowing device 600 to generate a gas flow.

[0034] In some optional embodiments, such as Figure 1 As shown, the magnetic separation device (400a, 400b) includes a box body 410 and a magnetic roller 420. The magnetic roller 420 is rotatably arranged in the box body 410, and a water inlet 411 is arranged on the upper side of the box body 410. After the mixed solution carrying ultrafine metal soft magnetic powder in the lower chamber 112 flows into the box body 410 of the magnetic separation device 400a, the magnetic roller 420 rotates. At this time, the mixed solution in the box body 410 can immerse a part of the magnetic roller 420, or the entire magnetic roller 420. Under the action of the magnetic force generated by the magnetic roller 420, the ultrafine metal soft magnetic powder in the mixed solution in the box body 410 is adsorbed on the wall surface of the magnetic roller 420, and then the powder on the surface of the magnetic roller 420 can be collected. Similarly, after the mixed solution carrying metallic soft magnetic powder with larger particle size in the upper chamber 111 flows into the box 410 of the magnetic separation device 400b, the magnetic roller 420 rotates. Under the action of the magnetic force generated by the magnetic roller 420, the metallic soft magnetic powder with larger particle size in the mixed solution in the box 410 is adsorbed on the wall surface of the magnetic roller 420, and then the powder on the surface of the magnetic roller 420 can be collected.

[0035] In some optional embodiments, such as Figure 1 As shown, a water outlet 412 is provided at the lower side of the box 410, and the metal soft magnetic powder screening device further includes a water delivery device 800, the input end of the water delivery device 800 is connected to the water outlet 412, and the output end of the water delivery device 800 is connected to the upper chamber 111. When the magnetic roller 420 has finished adsorbing the metal soft magnetic powder in the mixed solution in the box 410, the water delivery device 800 is opened and the remaining mixed solution in the box 410 is re-introduced into the upper chamber 111, so that only new metal soft magnetic powder to be screened needs to be added later, or a small amount of new dispersion solution is added at the same time, which greatly saves the amount of dispersion solution and saves costs.

[0036] In some optional embodiments, such as Figure 1As shown, a discharge port 413 is provided at the bottom of the box body 410, and the metal soft magnetic powder screening device further comprises a collecting device 900, and the collecting device 900 is connected to the discharge port 413. Specifically, the collecting device 900 comprises a collecting box 910 and a guide plate 920. One end of the guide plate 920 extends into the discharge port 413 and abuts against the wall surface of the magnetic roller 420, and the other end of the guide plate 920 extends into the collecting box 910. After the water delivery device 800 reintroduces the remaining mixed solution in the box 410 into the upper chamber 111, the wall surface of the rotating magnetic roller 420 slides in contact with the guide plate 920, and the guide plate 920 can scrape off the powder on the wall surface of the magnetic roller 420. Under the action of gravity, the powder will flow into the collection box 910 along the guide plate 920, and finally ultrafine metal soft magnetic powder and coarse powder containing a certain amount of water can be obtained, and dry powder can be obtained through conventional drying treatment afterwards.

[0037] The working principle of the metal soft magnetic powder screening device in the present application is described in detail below in combination with the best embodiment of the present application:

[0038] Add the metal soft magnetic powder and the dispersion solution to be screened into the filter barrel 100 and immerse the filter screen 200;

[0039] The ultrasonic generator 300 on the side wall of the upper chamber 111 and the filter 200 is turned on to disperse the metal soft magnetic powder in the mixed solution and prevent it from agglomerating. At the same time, the electromagnetism device 500 is turned on to control the falling speed of the powder and allow the ultrafine metal soft magnetic powder to pass quickly through the filter 200.

[0040] When the weight detection device 700 detects that the weight of the soft magnetic metal powder on the filter screen 200 exceeds a preset value, the gas dispersing device 600 is turned on and sprays gas around it. Under the thrust of the gas to both sides, the coarse powder will be discharged from the openings on both sides of the upper chamber 111 along with the water flow, and finally enter the box 410 of the magnetic separation device 400b, while the ultrafine soft magnetic metal powder will flow into the box 410 of the magnetic separation device 400a after passing through the filter screen 200;

[0041] The magnetic roller 420 rotates to absorb the powder in the mixed solution in the box 410. After the absorption is completed, the water delivery device 800 re-introduces the remaining mixed solution in the box 410 into the upper chamber 111.

[0042] Place the collecting box 910 at the corresponding position beside the box body 410, then extend one end of the guide plate 920 into the discharge port 413 and abut against the wall surface of the magnetic roller 420, and at the same time extend the other end of the guide plate 920 into the collecting box 910 until all the powder on the wall surface of the magnetic roller 420 is scraped off.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A metal soft magnetic powder screening device, characterized in that: The metal soft magnetic powder screening device comprises: A filter barrel, wherein a containing chamber is provided in the filter barrel; A filter screen is arranged in the containing chamber and divides the containing chamber into an upper chamber and a lower chamber which are interconnected, wherein the upper chamber is used to pass the dispersed solution and the metal soft magnetic powder; An ultrasonic generator, used for dispersing the metal soft magnetic powder in the mixed solution in the upper chamber and on the filter screen; Two types of magnetic separation devices, one type of magnetic separation device is connected to the bottom side of the lower chamber, generating a magnetic attraction to adsorb metal soft magnetic powder with a particle size smaller than the filter mesh aperture in the mixed solution flowing out of the lower chamber; the other type of magnetic separation device is connected to the bottom side of the upper chamber, generating a magnetic attraction to adsorb metal soft magnetic powder with a particle size not smaller than the filter mesh aperture in the mixed solution flowing out of the upper chamber.

2. The metal soft magnetic powder screening device according to claim 1, characterized in that: The metal soft magnetic powder screening device also includes an electromagnetism device, which generates a magnetic field in the lower chamber in the direction of the mixed solution flowing therein.

3. The metal soft magnetic powder screening device according to claim 1, characterized in that: The ultrasonic generator is arranged on the side wall of the upper chamber and / or on the filter screen.

4. The metal soft magnetic powder screening device according to claim 1 or 2, characterized in that: The metal soft magnetic powder screening device also includes a gas blowing device, which generates a gas flow when a preset condition is met to disperse the agglomerated metal soft magnetic powder on the filter screen.

5. The metal soft magnetic powder screening device according to claim 4, characterized in that: The gas dispersing device is arranged at the center of the filter screen and generates the gas flow radiating to the surroundings thereof.

6. The metal soft magnetic powder screening device according to claim 4, characterized in that: The metal soft magnetic powder screening device also includes a weight detection device, which is used to obtain the weight of the metal soft magnetic powder on the filter screen, and when the weight of the metal soft magnetic powder on the filter screen exceeds a preset value, the gas blowing device generates a gas flow.

7. The metal soft magnetic powder screening device according to claim 4, characterized in that: The magnetic separation device comprises a box body and a magnetic roller. The magnetic roller is rotatably arranged in the box body. A water inlet is arranged on the upper side of the box body.

8. The metal soft magnetic powder screening device according to claim 7, characterized in that: A water outlet is provided on the lower side of the box body, and the metal soft magnetic powder screening device also includes a water supply device, the input end of the water supply device is connected to the water outlet, and the output end of the water supply device is connected to the upper chamber to reintroduce the mixed solution in the magnetic separation device into the upper chamber.

9. The metal soft magnetic powder screening device according to claim 8, characterized in that: A discharge port is provided at the bottom of the box body, and the metal soft magnetic powder screening device also includes a collecting device, which is connected to the discharge port.

10. The metal soft magnetic powder screening device according to claim 9, characterized in that: The collecting device comprises a collecting box and a material guide plate, one end of the material guide plate can extend into the material outlet and abut against the wall surface of the magnetic roller, and the other end of the material guide plate can extend into the collecting box.

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