Micro powder magnetic separator and method for separating magnetic substances from micro powder

Abstract

The invention relates to a micro-powder magnetic separator and a method for separating magnetic substances from micro-powder, the micro-powder magnetic separator comprises a shell, a magnetic rod assembly and a driving assembly, gas enters the shell from a gas inlet through an air pipe, the micro-powder is uniformly dispersed in gas flow under the action of wind field force, the magnetic rod assembly is attached to the shell, and the gas flow flows in an inner cavity of the shell, so that the micro-powder is separated from the shell; magnetic micro-powder particles in airflow are adsorbed on the inner wall of the shell under the action of magnetic field force, after treated gas is exhausted out of the shell through the exhaust port, the exhaust port is closed, the powder exhaust port is opened, the two driving assemblies are started, and the two air cylinders contract to drive the two magnetic rod assemblies to rotate oppositely, so that the magnetic rod assemblies are far away from the shell; the magnetic substances slide down along the inner wall of the shell after losing magnetic force and are finally discharged through the powder discharging port, the micro powder and the gas can be separated only by stretching and retracting the driving assembly once, the energy consumption of the driving assembly is lower, and the material separation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of separation of materials and magnetic substances, and in particular to a micro-powder magnetic separator and a method for separating magnetic substances from micro-powders. Background Art

[0002] The existing micro-powder magnetic separator includes a rotating drum, an outer cover, a spiral magnetic roller and a driving device. When in use, the iron-containing micro-powder material flows down from the feed port, is agglomerated and distributed outside the rotating drum by the rotating rotating drum, and the spiral magnetic roller moves relative to the rotating drum. The agglomerated material moves with the spiral magnetic field. In the process of moving with the downward magnetic field, the non-magnetic material in the agglomeration falls to the finished product outlet under the action of gravity, and the magnetic iron powder moves along the rotating drum to the iron material outlet under the action of the rotating magnetic field. No magnet is installed at the iron material outlet, so the magnetic iron powder is detached from the rotating drum under the action of gravity and enters the iron material outlet to flow out. Since the existing micro-powder magnetic separator uses a driving device to continuously drive the rotating drum to separate and move the agglomerated material, the energy consumption of the driving device is high, and the cost of separating the materials is high.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In view of the deficiencies in the prior art, the embodiments of the present invention disclose a micro-powder magnetic separator and a method for separating magnetic materials from micro-powders, so as to solve the problem that the existing micro-powder magnetic separator uses a driving device to continuously drive a rotating drum to separate and move agglomerated materials, resulting in high energy consumption of the driving device and high cost when separating materials.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A micro powder magnetic separator comprises:

[0007] A shell having an inner cavity, an air inlet is provided at the top of the shell, the air inlet is connected to a ventilation pipe, and a powder discharge port and an air exhaust port are respectively provided at the bottom of the shell;

[0008] The magnetic bar assemblies have two, the top ends of the two magnetic bar assemblies are symmetrically hinged to the two sides of the shell, and the two magnetic bar assemblies are surrounded and sleeved on the outside of the shell;

[0009] The drive assembly has two, each of which includes a cylinder, the top ends of the two cylinders are symmetrically hinged to the two sides of the top end of the shell, the piston rods of the cylinders are hinged to the side of the magnetic rod assembly away from the shell, and the piston rods extend or retract and drive the magnetic rod assembly to rotate around the hinge axis at its first end to approach or move away from the shell.

[0010] A further technical solution is that the shell includes a truncated cone portion and a first cylindrical portion, the first cylindrical portion is arranged at the lower end of the truncated cone portion, and the truncated cone portion is communicated with the interior of the first cylindrical portion.

[0011] Its further technical solution is that a diverter cone shell is set up inside the shell, and the diverter cone shell includes a cone portion and a second cylindrical portion, the cone portion is located inside the truncated cone portion, the cone portion is arranged in a vertical direction, the apex of the cone portion faces the air inlet, and a gap is provided between the outer wall surface of the cone portion and the inner wall surface of the truncated cone portion to form a diverter channel, the second cylindrical portion is arranged at the bottom end of the cone portion, and a reflux port is opened at the bottom of the second cylindrical portion, the micro powder magnetic separator also includes an exhaust duct, the exhaust duct is set up in the second cylindrical portion, the exhaust port is opened at the bottom end of the exhaust duct, the bottom end of the exhaust duct extends out of the reflux port and passes through the bottom of the first cylindrical portion, and the exhaust duct connects the inside of the second cylindrical portion with the outside of the shell;

[0012] The gas is diverted from the air inlet into the diversion channel by the conical part, and after the gas passes through the reflux port along the diversion channel and enters the second cylindrical part, the gas enters the exhaust pipe and is discharged from the exhaust port at the bottom of the exhaust pipe.

[0013] A further technical solution is that the shell also includes a funnel portion, an end of the funnel portion with a larger outer diameter is connected to the bottom end of the first cylindrical portion, the powder discharge port is opened at the bottom end of the funnel portion, and the top end of the exhaust duct passes through the wall of the funnel portion and the reflux port and extends into the second cylindrical portion.

[0014] Its further technical solution is that the driving assembly also includes a support frame, and the two support frames are symmetrically arranged on both sides of the top of the truncated cone portion, the top of the cylinder is hinged to the bottom of the support frame, and the piston rod of the cylinder is hinged to the side of the magnetic rod assembly away from the shell, and the cylinder drives the magnetic rod assembly to rotate around the connection between the top of the magnetic rod assembly and the shell away from or close to the shell through the extension and contraction of the piston rod.

[0015] A further technical solution is that the magnetic bar assembly comprises a magnetic bar frame and a plurality of magnetic bars, and the plurality of magnetic bars are vertically arranged in the magnetic bar frame.

[0016] A further technical solution is that the cross section of the magnetic rod rack is a semicircular ring.

[0017] A further technical solution is that a connecting portion is provided on a side of the magnetic rod frame away from the shell, and the connecting portion is hinged to the bottom end of the piston rod of the cylinder.

[0018] A method for separating magnetic materials from micropowders, using the aforementioned micropowder magnetic separator, comprises the following steps:

[0019] Air intake: The gas enters the shell from the air inlet through the air duct;

[0020] Primary separation: the gas passes through the inner side of the first cylindrical part, and the magnetic powder in the gas is adsorbed on the inner wall of the first cylindrical part by the magnetic rod assembly;

[0021] Exhaust: The treated gas is discharged from the exhaust port outside the shell through the exhaust pipe;

[0022] Powder discharge: Start the two driving assemblies, the two cylinders contract to drive the two magnetic bar assemblies to rotate towards each other, so that the magnetic bar assemblies are away from the shell, and the magnetic material loses its magnetic force and falls along the inner wall of the first cylindrical part and the inner wall of the funnel part, and is finally discharged through the powder discharge port.

[0023] A further technical solution is that the air intake step further includes the following steps:

[0024] Diversion: The gas passes through the diversion cone shell in the shell, and the gas is diverted at the cone part, and the gas carries the micro powder to flow in the diversion channel;

[0025] The step of separating once further comprises the following steps:

[0026] Secondary separation: The treated gas continues to flow through the reflux port into the second cylindrical part.

[0027] The beneficial effects of the embodiments of the present invention are as follows:

[0028] (1) A micro powder magnetic separator includes a shell, a magnetic bar assembly and a driving assembly. Two magnetic bar assemblies are enclosed and sleeved on the outside of the shell. Gas enters the shell from the air inlet through the air duct. The micro powder is evenly dispersed in the air flow under the action of the wind field force. Since the magnetic bar assembly fits the shell, the air flow flows in the inner cavity of the shell. The magnetic micro powder particles in the air flow are adsorbed on the inner wall of the shell under the action of the magnetic field force. After the treated gas is discharged from the shell through the exhaust port, the exhaust port is closed, the powder discharge port is opened, and the two driving assemblies are started. The two cylinders contract and drive the two magnetic bar assemblies to rotate in opposite directions, so that the magnetic bar assemblies are away from the shell. The magnetic material loses its magnetic force and slides down the inner wall of the shell and is finally discharged through the powder discharge port. The driving assembly only needs to be extended and retracted once to achieve the separation of micro powder and gas. The energy consumption of the driving assembly is lower, which reduces the cost of separating materials.

[0029] (ii) Furthermore, a diverter cone shell and an exhaust duct are set up inside the shell. The gas enters the shell from the air inlet, passes through the diverter cone shell inside the shell, and is diverted at the cone part. The gas continues to flow with the powder, and the magnetic powder in the gas interacts with the magnetic rod assembly. The magnetic powder in the gas is adsorbed on the inner wall of the shell by the magnetic field of the magnetic rod assembly. After the gas flows along the diverter channel and passes through the reflux port into the second cylindrical part, the gas enters the exhaust duct and is discharged from the exhaust port at the bottom of the exhaust duct. The gas generates an airflow field dispersion force through the diverter cone shell, so that the magnetic powder in the gas is closer to the magnetic rod assembly, and the magnetic powder is subjected to a stronger magnetic attraction force, thereby further improving the separation effect of the powder magnetic separator.

[0030] (iii) Furthermore, the first separation step also includes a second separation, in which the gas after the first separation continues to flow through the reflux port into the second cylindrical portion, and the residual magnetic micropowder in the gas is adsorbed on the inner wall of the second cylindrical portion by the magnetic rod assembly. The second separation ensures that these fine magnetic particles can be completely separated, avoiding the loss of magnetic substances. Through this multiple treatment, the sorting efficiency of the equipment is improved, and the thoroughness of the sorting is also enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view structural schematic diagram of the micro powder magnetic separator of the present invention.

[0032] Figure 2 It is a schematic diagram of the top view of the micro powder magnetic separator of the present invention.

[0033] Figure 3 It is a schematic diagram of the top view of the magnetic rod assembly in the micro powder magnetic separator of the present invention.

[0034] Figure 4 It is a schematic diagram of the working structure of the driving component in the micro powder magnetic separator of the present invention.

[0035] In the figure:

[0036] 100, shell; 101, air inlet; 102, powder discharge port; 103, exhaust port; 104, diversion channel; 110, truncated cone portion; 120, first cylindrical portion; 130, exhaust duct; 140, funnel portion; 200, magnetic rod assembly; 210, magnetic rod rack; 220, magnetic rod; 230, connecting portion; 300, driving assembly; 310, supporting frame; 320, cylinder; 400, diversion cone shell; 410, conical portion; 420, second cylindrical portion; 421, reflux port. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0039] First embodiment:

[0040] This embodiment discloses a micro powder magnetic separator.

[0041] Figure 1 FIG. 2 is a schematic diagram of the front view of the micro powder magnetic separator of the present invention. Figure 1 As shown, a micro powder magnetic separator includes a housing 100, a magnetic rod assembly 200 and a driving assembly 300. The housing 100 has an inner cavity and is made of non-magnetic materials, such as stainless steel. An air inlet 101 is provided at the top of the housing 100, and the air inlet 101 is connected to a ventilation duct. A powder discharge port 102 and an exhaust port 103 are provided at the bottom of the housing 100. Exemplarily, the housing 100 includes a truncated cone portion 110 and a first cylindrical portion 120. The first cylindrical portion 120 is provided at the lower end of the truncated cone portion 110, and the truncated cone portion 110 is connected to the inside of the first cylindrical portion 120.

[0042] Figure 2 FIG. 2 is a schematic diagram of the top view of the micro powder magnetic separator of the present invention. Figures 1-2 As shown, there are two magnetic bar assemblies 200 , the top ends of the two magnetic bar assemblies 200 are symmetrically hinged to the two sides of the housing 100 , and the two magnetic bar assemblies 200 are surrounded and sleeved on the outside of the housing 100 .

[0043] like Figure 1As shown, the driving assembly 300 has two, and the driving assembly 300 includes a cylinder 320, the tops of the two cylinders 320 are symmetrically hinged to the two sides of the top of the housing 100, the piston rods of the cylinders 320 are hinged to the side of the magnetic rod assembly 200 away from the housing 100, and the piston rods extend or retract and drive the magnetic rod assembly 200 to rotate around the hinge axis of its first end to approach or move away from the housing 100. Exemplarily, the driving assembly 300 also includes a support frame 310, the two support frames 310 are symmetrically arranged on both sides of the top of the truncated table portion 110, and the support frames 310 are perpendicular to the hinge axis of the first end of the magnetic rod assembly 200, the top of the cylinder 320 is hinged to the bottom of the support frame 310, and the piston rods of the cylinders 320 are hinged to the side of the magnetic rod assembly 200 away from the housing 100, and the cylinders 320 drive the magnetic rod assembly 200 to rotate around the connection between the top of the magnetic rod assembly 200 and the housing 100 to move away from or approach the housing 100 through the extension and contraction of the piston rods.

[0044] Figure 3 FIG. 1 is a schematic diagram of the top view of the magnetic rod assembly in the micro powder magnetic separator of the present invention. Figures 1 to 3 As shown, further, the magnetic rod assembly 200 includes a magnetic rod rack 210 and a plurality of magnetic rods 220, and the magnetic force of the magnetic rod 220 is ≥11000Gs. Specifically, the cross-section of the magnetic rod rack 210 is a semicircular ring. Exemplarily, a connecting portion 230 is also provided on the side of the magnetic rod rack 210 away from the shell 100, and the connecting portion 230 is hinged to the bottom end of the piston rod of the cylinder 320. A plurality of magnetic rods 220 are vertically arranged in the magnetic rod rack 210. The plurality of magnetic rods 220 in the magnetic rod assembly 200 are arranged vertically in the magnetic rod rack 210 to form a stable magnetic field area, and the magnetic rods 220 effectively adsorb and capture the passing magnetic micro-powder particles, so that the magnetic material can be adsorbed to the greatest extent when passing, thereby improving the sorting effect of the magnetic material.

[0045] like Figure 1 and Figure 4 As shown, further, the shell 100 also includes a funnel portion 140, and the end of the funnel portion 140 with a larger outer diameter is connected to the bottom end of the first cylindrical portion 120, and the powder discharge port 102 is opened at the bottom end of the funnel portion 140. The top of the exhaust duct 130 passes through the wall of the funnel portion 140 and the reflux port 421 and extends into the second cylindrical portion 420. The funnel portion 140 is designed. When the magnetic micro-powder particles lose their magnetic attraction, the magnetic micro-powder particles fall down under the action of gravity, providing a sliding path for the magnetic micro-powder particles, ensuring that the particles flow smoothly to the powder discharge port 102 under the action of gravity, effectively avoiding the problems of particle accumulation, blockage or retention, and ensuring the continuous operation and sorting efficiency of the equipment.

[0046] This embodiment also discloses a method for separating magnetic substances from micropowders.

[0047] like Figure 1 and Figure 4 As shown, a method for separating magnetic materials from micropowders uses the aforementioned micropowder magnetic separator, comprising the following steps:

[0048] Step S1, air intake: gas enters the housing 100 from the air inlet 101 through the air duct;

[0049] Step S2, diversion: the gas passes through the diversion cone shell 400 in the housing 100, the gas is diverted at the cone portion 410, and the gas carries the powder and flows in the diversion channel 104;

[0050] Step S3, primary separation: the gas passes through the inner side of the first cylindrical portion 120, and the magnetic powder in the gas is adsorbed on the inner wall of the first cylindrical portion 120 by the magnetic rod assembly 200;

[0051] Step S4, exhaust: the processed gas is discharged from the housing 100 through the exhaust port 103 through the exhaust pipe 130;

[0052] Step S5, powder discharge: start the two driving assemblies 300, the two cylinders 320 contract and drive the two magnetic rod assemblies 200 to rotate towards each other, so that the magnetic rod assemblies 200 are away from the shell 100, and the magnetic material loses its magnetic force and falls along the inner wall of the first cylindrical part 120 and the inner wall of the funnel part 140, and is finally discharged through the powder discharge port 102.

[0053] In this embodiment, the driving component 300 can separate the powder from the gas by only one extension and contraction, and the energy consumption of the driving component 300 is lower, thereby reducing the cost of separating materials.

[0054] Second embodiment:

[0055] Based on the first embodiment, the second embodiment further optimizes and refines the structure in the inner cavity of the shell 100 of the first embodiment.

[0056] Figure 4 Schematic diagram of the working structure of the driving component in the micro powder magnetic separator of the present invention. Figure 1 and Figure 4As shown, further, a flow dividing cone shell 400 is set inside the shell 100, and the flow dividing cone shell 400 includes a conical portion 410 and a second cylindrical portion 420. The conical portion 410 is located in the truncated cone portion 110, and the conical portion 410 is arranged in a vertical direction. The apex of the conical portion 410 faces the air inlet 101. There is a gap between the outer wall surface of the conical portion 410 and the inner wall surface of the truncated cone portion 110 to form a flow dividing channel 104. The second cylindrical portion 420 is provided At the bottom end of the conical portion 410, a reflux port 421 is opened at the bottom of the second cylindrical portion 420. The micro-powder magnetic separator also includes an exhaust duct 130, which is erected in the second cylindrical portion 420. The exhaust port 103 is opened at the bottom end of the exhaust duct 130. The bottom end of the exhaust duct 130 extends out of the reflux port 421 and passes through the bottom of the first cylindrical portion 120. The exhaust duct 130 connects the interior of the second cylindrical portion 420 with the outside of the shell 100.

[0057] like Figure 1 and Figure 4 As shown, the gas enters the shell 100 from the air inlet 101, passes through the diverter cone shell 400 in the shell 100, and is diverted at the cone portion 410, so that the incoming airflow maintains a laminar state, and the flow rate of the stable gas is less than 0.8 m / s. The gas continues to flow in the diverter channel 104 with the micropowder, and the magnetic micropowder in the gas interacts with the magnetic rod assembly 200. The magnetic micropowder in the gas is adsorbed on the inner wall of the shell 100 by the magnetic field of the magnetic rod assembly 200. After the gas flows along the diverter channel 104 and passes through the reflux port 421 into the second cylindrical portion 420, the gas enters the exhaust pipe 130 and is discharged from the exhaust port 103 at the bottom end of the exhaust pipe 130. The gas generates an airflow field dispersion force through the diverter cone shell 400, so that the magnetic micropowder in the gas is closer to the magnetic rod assembly 200, and the magnetic micropowder is subjected to a stronger magnetic attraction force, thereby further improving the separation effect of the micropowder magnetic separator.

[0058] This embodiment also discloses a method for separating magnetic substances from micropowders.

[0059] like Figure 1 and Figure 4 As shown, a method for separating magnetic materials from micropowders uses the aforementioned micropowder magnetic separator, comprising the following steps:

[0060] Step S1, air intake: gas enters the housing 100 from the air inlet 101 through the air duct;

[0061] Step S2, diversion: the gas passes through the diversion cone shell 400 in the housing 100, the gas is diverted at the cone portion 410, and the gas carries the powder and flows in the diversion channel 104;

[0062] Step S3, primary separation: the gas passes through the inner side of the first cylindrical portion 120, and the magnetic powder in the gas is adsorbed on the inner wall of the first cylindrical portion 120 by the magnetic rod assembly 200;

[0063] Step S4, secondary separation: the gas separated once continues to flow through the reflux port 421 into the second cylindrical portion 420, and the residual magnetic powder in the gas is adsorbed on the inner wall of the second cylindrical portion 420 by the magnetic rod assembly 200;

[0064] Step S5, exhaust: the processed gas is discharged from the housing 100 through the exhaust port 103 through the exhaust pipe 130;

[0065] Step S6, powder discharge: start the two driving assemblies 300, the two cylinders 320 contract and drive the two magnetic rod assemblies 200 to rotate towards each other, so that the magnetic rod assemblies 200 are away from the shell 100, and the magnetic material loses its magnetic force and falls along the inner wall of the first cylindrical part 120 and the inner wall of the second cylindrical part 420 into the funnel part 140, and is finally discharged through the powder discharge port 102.

[0066] In this embodiment, the secondary separation ensures that these tiny magnetic particles can be completely separated, avoiding the loss of magnetic substances. Through this multiple treatment, the sorting efficiency of the equipment is improved, and the thoroughness of the sorting is also enhanced.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. 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, and these 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 micro powder magnetic separator, characterized in that: include: A shell (100), wherein the shell (100) has an inner cavity, an air inlet (101) is provided at the top end of the shell (100), the air inlet (101) is connected to a ventilation pipe, and a powder discharge port (102) and an air exhaust port (103) are respectively provided at the bottom end of the shell (100); There are two magnetic bar assemblies (200), the top ends of the two magnetic bar assemblies (200) are symmetrically hinged to the two sides of the housing (100), and the two magnetic bar assemblies (200) are enclosed and sleeved on the outside of the housing (100); The drive assembly (300) has two components, each comprising a cylinder (320). The top ends of the two cylinders (320) are symmetrically hinged to the two sides of the top end of the housing (100). The piston rods of the cylinders (320) are hinged to the side of the magnetic rod assembly (200) away from the housing (100). The piston rods extend or retract and drive the magnetic rod assembly (200) to rotate around the hinge axis at its first end toward or away from the housing (100).

2. The micro powder magnetic separator according to claim 1, characterized in that: The shell (100) includes a truncated cone portion (110) and a first cylindrical portion (120), wherein the first cylindrical portion (120) is arranged at the lower end of the truncated cone portion (110), and the truncated cone portion (110) and the first cylindrical portion (120) are internally connected.

3. The micro powder magnetic separator according to claim 2, characterized in that: A diverter cone shell (400) is mounted inside the housing (100), and the diverter cone shell (400) includes a conical portion (410) and a second cylindrical portion (420). The conical portion (410) is located inside the truncated cone portion (110). The conical portion (410) is arranged in a vertical direction, and the apex of the conical portion (410) faces the air inlet (101). A gap is formed between the outer wall surface of the conical portion (410) and the inner wall surface of the truncated cone portion (110), thereby forming a diverter channel (104). The second cylindrical portion (420) is arranged on the conical portion. (410), a reflux port (421) is provided at the bottom of the second cylindrical portion (420), the micro-powder magnetic separator further comprises an exhaust pipe (130), the exhaust pipe (130) is erected in the second cylindrical portion (420), the exhaust port (103) is provided at the bottom end of the exhaust pipe (130), the bottom end of the exhaust pipe (130) extends out of the reflux port (421) and passes through the bottom of the first cylindrical portion (120), and the exhaust pipe (130) communicates the interior of the second cylindrical portion (420) with the exterior of the housing (100); The gas is diverted from the gas inlet (101) by the conical portion (410) into the diversion channel (104), and after the gas passes through the reflux port (421) along the diversion channel (104) and enters the second cylindrical portion (420), the gas enters the exhaust pipe (130) and is discharged from the exhaust port (103) at the bottom end of the exhaust pipe (130).

4. The micro powder magnetic separator according to claim 3, characterized in that: The shell (100) further includes a funnel portion (140), wherein the end of the funnel portion (140) with a larger outer diameter is connected to the bottom end of the first cylindrical portion (120), the powder discharge port (102) is opened at the bottom end of the funnel portion (140), and the top end of the exhaust pipe (130) passes through the wall of the funnel portion (140) and the reflux port (421) and extends into the second cylindrical portion (420).

5. The micro powder magnetic separator according to claim 2, characterized in that: The driving assembly (300) further comprises a support frame (310), wherein two support frames (310) are symmetrically arranged on both sides of the top of the truncated cone portion (110), and the support frames (310) are perpendicular to the hinge axis of the first end of the magnetic rod assembly (200), the top of the cylinder (320) is hinged to the bottom of the support frame (310), and the piston rod of the cylinder (320) is hinged to the side of the magnetic rod assembly (200) away from the housing (100), and the cylinder (320) drives the magnetic rod assembly (200) to rotate around the connection between the top of the magnetic rod assembly (200) and the housing (100) to move away from or closer to the housing (100) through the extension and contraction of the piston rod.

6. The micro powder magnetic separator according to claim 5, characterized in that: The magnetic rod assembly (200) comprises a magnetic rod frame (210) and a plurality of magnetic rods (220), wherein the plurality of magnetic rods (220) are vertically arranged in the magnetic rod frame (210).

7. The micro powder magnetic separator according to claim 6, characterized in that: The cross section of the magnetic rod holder (210) is a semicircular ring.

8. The micro powder magnetic separator according to claim 7, characterized in that: A connecting portion (230) is further provided on a side of the magnetic rod holder (210) away from the housing (100), and the connecting portion (230) is hinged to the bottom end of the piston rod of the cylinder (320).

9. A method for separating magnetic materials from micropowders, using the micropowder magnetic separator according to claim 4, characterized in that: The following steps are involved: Air intake: The gas enters the housing (100) from the air intake (101) through the air duct; Primary separation: the gas passes through the inner side of the first cylindrical portion (120), and the magnetic fine powder in the gas is adsorbed on the inner wall of the first cylindrical portion (120) by the magnetic rod assembly (200); Exhaust: The processed gas is discharged from the housing (100) through the exhaust pipe (130) and the exhaust port (103); Powder discharge: the two driving assemblies (300) are started, and the two cylinders (320) are contracted to drive the two magnetic bar assemblies (200) to rotate in opposite directions, so that the magnetic bar assemblies (200) are away from the housing (100), and the magnetic material loses its magnetic force and falls along the inner wall of the first cylindrical part (120) and the inner wall of the funnel part (140), and is finally discharged through the powder discharge port (102).

10. The method for separating magnetic materials from micropowders according to claim 9, characterized in that: The air intake step further includes the following steps: Diversion: The gas passes through the diversion cone shell (400) in the housing (100), the gas is diverted at the conical portion (410), and the gas carries the micropowder and flows in the diversion channel (104); The step of separating once further comprises the following steps: Secondary separation: The processed gas continues to flow through the reflux port (421) and enters the second cylindrical portion (420).

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