A surface modification system and modification method of magnetic material

Abstract

The present invention discloses a surface modification system and a modification method of a magnetic material. A surface modification system of a magnetic material comprises a reactor, a mixing chamber is provided inside the reactor, a discharge pipe is provided through the middle of the mixing chamber, a filter disc is rotatably sleeved on the outer end of the discharge pipe, the filter disc is concavely arranged, and an oscillation mechanism is provided at the bottom of the filter disc to enable the filter disc to move up and down, the upper end face of the filter disc is rotatably connected to a limiting ring, the side end face of the limiting ring is rotatably connected to a collecting pressure rod that fits the surface of the filter disc, the bottom of the limiting ring is provided with a feeding port that fits the filter disc, and the limiting ring is driven and connected to a driving mechanism. The device avoids the agglomeration of magnetic powder caused by external magnetization during magnetic powder modification, thereby improving the magnetic powder modification effect, and at the same time collects and reuses the magnetized magnetic powder to improve the utilization rate of raw materials.

Description

Technical Field

[0001] The present invention relates to the technical field of modification equipment, and in particular to a surface modification system and a modification method of a magnetic material. Background Art

[0002] Chemical modification is a method of changing the physical and chemical properties of polymers through chemical reactions.

[0003] Traditional NdFeB ternary magnets have too small intrinsic coercive force, low Curie temperature, large temperature coefficient, poor heat resistance and corrosion resistance, and are not suitable for many high and low temperature, complex use conditions, instruments and meters, motors and other occasions. Therefore, they need to be modified by adding various elements such as Dy, Tb, Co, Al, Cu, Nb, Ti, Zr, Hf, Ga, etc. to improve their various magnetic properties, improve temperature coefficient, increase Curie temperature, increase bulk chemical potential, reduce the proportion of boron-rich phase, etc., in order to adapt to various use conditions.

[0004] Chinese patent publication number CN213914618U discloses an automated production equipment for surface modification of magnetic materials. The utility model includes a surface treatment device for surface treatment of magnetic materials, a surface modification device and an air cooling device for cooling the magnetic materials, which are connected in sequence. The surface treatment device includes an activation treatment tank for soaking the magnetic material, a water washing tank for washing the magnetic material and a moving mechanism. The moving mechanism can transport the magnetic material to the activation treatment tank, the water washing tank and the surface modification device in sequence. In the utility model, the magnetic material is transported by the moving mechanism, first sent to the activation treatment tank for soaking, and then sent to the water washing tank after extraction, and then sent to the surface modification device for drying. The utility model has a high degree of automation, improves work efficiency and reduces labor intensity.

[0005] Existing devices are mostly suitable for traditional surface coating modification of magnets, and their modification effect on magnets is limited. The existing technology mostly adopts surface modification of magnetic powder and then mixed sintering to form. As a result, traditional devices cannot effectively modify magnetic powder. Moreover, when the existing modification equipment modifies the magnetic powder, the magnetic powder easily agglomerates and affects the mixing effect with the modification liquid, thereby affecting the modification result.

[0006] Therefore, it is necessary to provide a surface modification system and modification method of magnetic materials to solve the above technical problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a surface modification system and modification method of a magnetic material to solve the above technical problems.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a surface modification system for magnetic materials, comprising a reactor, a mixing chamber is provided inside the reactor, a discharge pipe is provided through the middle of the mixing chamber, a filter disc is rotatably sleeved on the outer end of the discharge pipe, the filter disc is concavely arranged, and an oscillation mechanism is provided at the bottom of the filter disc to move the filter disc up and down, the upper end face of the filter disc is rotatably connected to a limiting ring, the side end face of the limiting ring is rotatably connected to a collecting pressure rod that fits the surface of the filter disc, the bottom of the limiting ring is provided with an inlet that fits the filter disc, and the limiting ring is driven by a driving mechanism.

[0009] Furthermore, the top of the reactor may be provided with a feeding port for feeding materials, and a corresponding window may be provided on the side for easy observation.

[0010] As a further solution of the present invention, the driving mechanism includes an outer rod, a driving gear and a bevel gear. The driving gear is rotatably embedded in the inner wall of the limiting ring, and the bevel gear is fixedly connected to the end of the driving gear away from the limiting ring. The outer rod is rotatably embedded in the interior of the limiting ring, and the bottom of the outer rod is provided with a bevel tooth groove that meshes with the bevel gear, and the upper surface of the filter plate is embedded with a tooth groove that meshes with the driving gear.

[0011] As a further solution of the present invention, the oscillation mechanism includes a fixed ring and a bevel protrusion, the fixed ring is fixedly connected to the bottom of the mixing chamber, and the fixed ring is sleeved with the discharge pipe, the bevel protrusion is fixedly connected to the upper end face of the fixed ring, and the bottom of the filter plate is provided with a bevel portion adapted to the bevel protrusion.

[0012] Furthermore, the inclined surface protrusion is an arc-shaped inclined surface, and the end of the inclined surface is vertically arranged.

[0013] As a further solution of the present invention, a driving rod is sleeved inside the outer rod via an elastic member. The driving rod extends through and to the outside of the reactor. The driving rod and the outer rod rotate coaxially.

[0014] Furthermore, one end of the driving rod away from the elastic member is drivingly connected to a driving source, and the driving source includes but is not limited to a servo motor and the like.

[0015] As a further solution of the present invention, the collecting pressure rod includes a rotating shaft, a feed gap, a spiral blade and an outer sleeve. The outer sleeve is fixedly connected to the side end face of the limiting ring, and the outer sleeve is in contact with the surface of the filter disc. The feed gap is opened inside the outer sleeve. The rotating shaft is rotatably arranged in the middle of the outer sleeve, and one end of the rotating shaft passes through the limiting ring and rotates coaxially with the driving gear. The spiral blade is wrapped around the outer end face of the rotating shaft and in contact with the inner wall of the outer sleeve.

[0016] As a further solution of the present invention, the rotating shaft includes an adsorption rod and a non-metallic rod, and a filter press plate is provided at the junction of the adsorption rod and the non-metallic rod. The filter press plate is fixedly connected to the inner wall of the outer sleeve. The upper end face of the reactor is provided with a waste pipe, and the waste pipe passes through a limiting ring and is connected to one end of the outer sleeve that is attached to the non-metallic rod.

[0017] Furthermore, the collecting pressure rods may be symmetrically provided in multiple groups, and the feeding gaps may also be symmetrically provided along the surface of the outer sleeve.

[0018] Furthermore, a heating layer compatible with the non-metallic rod can be provided inside the discharge pipe and the limiting ring. When the magnetic powder modification is completed, the filter disc is raised so that the filter disc is separated from the liquid surface of the modified liquid. The magnetized magnetic powder can be heated and dried by the heating layer, and the magnetic powder is filtered through the filter press plate, and the cluster structure is broken. At this time, the magnetized magnetic powder can be effectively collected by traction through the driving mechanism.

[0019] Furthermore, two groups of filter discs can be provided, which are symmetrically arranged on the upper and lower sides of the collecting pressure rod, so that the magnetic powder can be filtered in multiple stages.

[0020] A modification method for a surface modification system of a magnetic material comprises placing magnetic powder and a modifying liquid inside a mixing chamber and making the liquid level of the modifying liquid higher than the surface of a filter disc. A driving mechanism drives the filter disc to rotate, driving a collecting pressure rod to crush the material on the surface of the filter disc. While the filter disc rotates, an oscillation mechanism causes the filter disc to oscillate up and down, and the filter disc presents a concave setting. While oscillating, the magnetic powder gradually gathers toward the middle of the filter disc and enters the inside of a discharge pipe through an inlet for collection.

[0021] When the present invention is used, the magnetic powder and the modified liquid are placed inside the mixing chamber and the liquid level of the modified liquid is made higher than the surface of the filter disc. The filter disc is driven to rotate by a driving mechanism. During rotation, the material on the surface of the filter disc is crushed by the collecting pressure rod. The filter disc can be provided with corresponding filter holes to filter out the magnetic powder with too small an aperture, thereby making the particle size of the magnetic powder uniform. At the same time, the rotation of the filter disc and the pressing of the collecting pressure rod can fully mix the modified liquid and the magnetic powder to improve the modification effect. While rotating, the filter disc is made to oscillate up and down by the oscillation mechanism to further improve the mixing effect of the modified liquid and the magnetic powder. The filter disc is concavely set, so that the magnetic powder gradually gathers toward the middle of the filter disc while oscillating and enters the interior of the discharge pipe through the feed port for discharge and collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and examples.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 3 It is a schematic cross-sectional structure diagram of the present invention;

[0026] Figure 4 The present invention Figure 3 A in the middle is an enlarged structural diagram;

[0027] Figure 5 The present invention Figure 3 The enlarged structural diagram at B in the middle;

[0028] Figure 6 It is a schematic diagram of the internal structure of the pressure rod of the present invention;

[0029] Figure 7 1 is a schematic diagram of the cross-sectional structure of the limiting ring of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the mixing state of the present invention;

[0031] Figure 9 The present invention Figure 8 The enlarged structural diagram at C in the middle;

[0032] Figure 10 It is a schematic structural diagram of the discharging state of the present invention;

[0033] Figure 11 It is a schematic structural diagram of the oscillation mechanism of the present invention;

[0034] Figure 12 The present invention Figure 10 Enlarged structural diagram at point D in the middle.

[0035] In the figure: 1. Reactor; 2. Driving mechanism; 3. Waste discharge pipe; 4. Feeding port; 5. Discharge pipe; 6. Mixing chamber; 7. Filter plate; 8. Feed inlet; 9. Collecting pressure rod; 10. Limiting ring; 11. Oscillation mechanism; 12. Driving rod; 13. Outer rod; 14. Elastic member; 15. Bevel gear groove; 16. Driving gear; 17. Bevel gear; 18. Gear groove; 19. Rotating shaft; 20. Feed gap; 21. Spiral blade; 22. Outer sleeve; 23. Adsorption rod; 24. Filter press plate; 25. Non-metallic rod; 26. Modifying liquid; 27. Fixing ring; 28. Inclined protrusion. DETAILED DESCRIPTION

[0036] Example 1

[0037] like Figure 1-3As shown, a surface modification system for magnetic materials includes a reactor 1, a mixing chamber 6 is opened inside the reactor 1, a discharge pipe 5 is passed through the middle of the mixing chamber 6, the outer end of the discharge pipe 5 is rotatably sleeved with a filter disc 7, the filter disc 7 is concavely arranged, and the bottom of the filter disc 7 is provided with an oscillation mechanism 11 for moving the filter disc 7 up and down, the upper end face of the filter disc 7 is rotatably connected to a limiting ring 10, the side end face of the limiting ring 10 is rotatably connected to a collecting pressure rod 9 that fits the surface of the filter disc 7, the bottom of the limiting ring 10 is provided with an inlet 8 that fits the filter disc 7, and the limiting ring 10 is driven and connected to a driving mechanism 2.

[0038] Furthermore, a feeding port 4 may be provided on the top of the reactor 1 for feeding materials, and a corresponding window may be provided on the side for easy observation.

[0039] During use, the magnetic powder and the modified liquid 26 are placed inside the mixing chamber 6 and the liquid level of the modified liquid 26 is higher than the surface of the filter disc 7. The filter disc 7 is driven to rotate by the driving mechanism 2. The material on the surface of the filter disc 7 is crushed by the collecting pressure rod 9 during rotation, and the filter disc 7 can be provided with corresponding filter holes to filter out the magnetic powder with too small an aperture, thereby making the particle size of the magnetic powder uniform. At the same time, the rotation of the filter disc 7 and the pressing of the collecting pressure rod 9 can make the modified liquid 26 and the magnetic powder fully mixed to improve the modification effect. While rotating, the filter disc 7 is made to oscillate up and down by the oscillation mechanism 11, further improving the mixing effect of the modified liquid 26 and the magnetic powder. The filter disc 7 is concavely set, so that the magnetic powder gradually gathers to the middle of the filter disc 7 while oscillating and enters the interior of the discharge pipe 5 through the inlet 8 for discharge and collection.

[0040] Example 2

[0041] Based on the first embodiment, Figure 1-5 As shown, the driving mechanism 2 includes an outer rod 13, a driving gear 16 and a bevel gear 17. The driving gear 16 is rotatably embedded in the inner wall of the limiting ring 10, and the bevel gear 17 is fixedly connected to the end of the driving gear 16 away from the limiting ring 10. The outer rod 13 is rotatably embedded in the interior of the limiting ring 10, and the bottom of the outer rod 13 is provided with a bevel tooth groove 15 that meshes with the bevel gear 17, and the upper surface of the filter disc 7 is embedded with a tooth groove 18 that meshes with the driving gear 16.

[0042] During use, the outer rod 13 rotates, and the outer rod 13 engages with the bevel gear 17 through the bevel tooth groove 15, thereby promoting the rotation of the bevel tooth groove 15. The bevel tooth groove 15 engages with the tooth groove 18, and the tooth groove 18 rotates with the rotation of the outer rod 13, thereby realizing the rotation drive of the filter disc 7 by the rotation of the outer rod 13, and improving the liquid mixing effect by the rotation of the filter disc 7.

[0043] like Figure 1-5As shown in Figures 7-11, the oscillation mechanism 11 includes a fixed ring 27 and a bevel protrusion 28. The fixed ring 27 is fixedly connected to the bottom of the mixing chamber 6, and the fixed ring 27 is sleeved with the discharge pipe 5. The bevel protrusion 28 is fixedly connected to the upper end face of the fixed ring 27, and the bottom of the filter disc 7 is provided with a bevel portion adapted to the bevel protrusion 28.

[0044] Furthermore, the inclined surface protrusion 28 is an arc-shaped inclined surface, and the end of the inclined surface is vertically arranged.

[0045] During use, the setting of the inclined protrusion 28 allows the filter disc 7 to continuously engage and stagger with the inclined protrusion 28 while rotating, so that the filter disc 7 oscillates up and down while rotating, thereby improving the mixing and filtering effect of the magnetic powder. Furthermore, when the filter disc 7 is at the bottom of the up and down movement stroke, the filter disc 7 is below the liquid level of the modified liquid 26, and the discharge pipe 5 closes the inlet 8 to prevent the modified liquid 26 from entering the interior of the discharge pipe 5. When the filter disc 7 is at the top of the up and down movement, the filter disc 7 is separated from the modified liquid 26 and is above the liquid level of the modified liquid 26. At this time, the inlet 8 is connected to the top of the discharge pipe 5 as the filter disc 7 rises, so that the magnetic powder at the upper part of the liquid surface accumulates with the continuous oscillation and finally falls into the interior of the discharge pipe 5 through the inlet 8, thereby effectively controlling the loss of the modified liquid 26, improving the modification cost of the device, and also facilitating the subsequent sintering and molding of the magnetic powder.

[0046] like Figure 1-4 As shown, the driving rod 12 is sleeved inside the outer rod 13 via an elastic member 14 . The driving rod 12 extends through the outside of the reactor 1 . The driving rod 12 and the outer rod 13 rotate coaxially.

[0047] Furthermore, one end of the driving rod 12 away from the elastic member 14 is drivingly connected to a driving source, and the driving source includes but is not limited to a servo motor and the like.

[0048] When in use, the driving rod 12 and the outer rod 13 rotate coaxially, and the outer rod 13 is slidably pinned to the driving rod 12 through a pin key, so that the rotation of the driving rod 12 can drive the outer rod 13 to rotate synchronously, and an elastic member 14 is provided between the outer rod 13 and the driving rod 12. The elastic member 14 can be a spring, etc., so that the limit ring 10 can move adaptively with the reciprocating movement of the filter disc 7 to avoid interference with the movement of the filter disc 7.

[0049] like Figure 1-6As shown, the collecting pressure rod 9 includes a rotating shaft 19, a feed gap 20, a spiral blade 21 and an outer sleeve 22. The outer sleeve 22 is fixedly connected to the side end face of the limiting ring 10, and the outer sleeve 22 is in contact with the surface of the filter disc 7. The feed gap 20 is opened inside the outer sleeve 22. The rotating shaft 19 is rotatably set in the middle of the outer sleeve 22, and one end of the rotating shaft 19 passes through the limiting ring 10 and rotates coaxially with the driving gear 16. The spiral blade 21 is wrapped around the outer end face of the rotating shaft 19 and is in contact with the inner wall of the outer sleeve 22.

[0050] like Figure 1-6 As shown, the rotating shaft 19 includes an adsorption rod 23 and a non-metallic rod 25. A filter press plate 24 is provided at the junction of the adsorption rod 23 and the non-metallic rod 25. The filter press plate 24 is fixedly connected to the inner wall of the outer sleeve 22. A waste discharge pipe 3 is provided on the upper end face of the reactor 1. The waste discharge pipe 3 passes through the limiting ring 10 and is connected to one end of the outer sleeve 22 that is attached to the non-metallic rod 25.

[0051] Furthermore, the collecting pressure bars 9 may be symmetrically provided in multiple groups, and the feeding gaps 20 may also be symmetrically provided along the surface of the outer sleeve 22 .

[0052] During use, the magnetic powder is magnetized by external force, and part of the magnetized magnetic powder will be doped. While being squeezed and vibrated, the magnetic powder enters the interior of the outer sleeve 22 through the feed gap 20, and the normal magnetic powder is discharged from the feed gap 20 as it vibrates. The rotating shaft 19 is divided into an adsorption rod 23 and a non-metallic rod 25, wherein the rotating shaft 19 extends through the inner area of the limit ring 10 and adopts a non-metallic rod 25, and the remaining part of the rotating shaft 19 adopts an adsorption rod 23, which is made of magnetic metal. The adsorption rod 23 can make the collecting pressure rod 9 press the magnetic powder. The magnetic powder that has been magnetized by external force in the magnetic powder is adsorbed on the adsorption rod 23, and as the magnetized magnetic powder accumulates, it is gradually transported inside the outer sleeve 22 under the action of the adsorption rod 23 and the spiral blade 21, and finally After finally being squeezed through the filter press plate 24, it enters one end of the non-metallic rod 25. The non-metallic rod 25 has no adsorption effect on the magnetized magnetic powder, thereby avoiding the magnetized magnetic powder from being adsorbed into agglomerates and affecting the surface modification effect of the magnetic powder. At the same time, the magnetic powder agglomerates are further squeezed and crushed by the filter press plate 24 and collected at the non-metallic rod 25, effectively avoiding the mixing of the magnetized powder and the magnetic powder to affect the modification and subsequent sintering operations. In addition, a waste discharge pipe 3 is provided, and the waste discharge pipe 3 is connected with a negative pressure mechanism. After the magnetic powder is modified, the waste discharge pipe 3 is connected to the outer sleeve 22 to suck out the magnetized magnetic powder at the non-metallic rod 25. The magnetized magnetic powder can be reused after demagnetization, thereby improving the utilization rate of the magnetic powder and realizing the full reuse of the magnetic powder magnetized by external force, while reducing the influence on the modification of the magnetic powder.

[0053] Furthermore, a heating layer compatible with the non-metallic rod 25 can be provided inside the discharge pipe 5 and the limiting ring 10. When the magnetic powder modification is completed, the filter disc 7 is raised so that the filter disc 7 is separated from the liquid surface of the modified liquid 26. The magnetized magnetic powder can be heated and dried by the heating layer, and the magnetic powder is filtered through the filter plate 24, and the clumping structure has been broken. At this time, the magnetized magnetic powder can be effectively collected by traction through the driving mechanism 2.

[0054] Furthermore, two groups of filter discs 7 can be provided, symmetrically arranged on the upper and lower sides of the collecting pressure rod 9, so that the magnetic powder can be filtered in multiple stages.

[0055] A modification method for a surface modification system of a magnetic material comprises the following steps: placing magnetic powder and a modifying liquid 26 inside a mixing chamber 6 and making the liquid level of the modifying liquid 26 higher than the surface of a filter disc 7; a driving mechanism 2 driving the filter disc 7 to rotate and driving a collecting pressure rod 9 to crush the material on the surface of the filter disc 7; while the filter disc 7 rotates, an oscillation mechanism 11 causes the filter disc 7 to oscillate up and down, and the filter disc 7 is concavely arranged; while oscillating, the magnetic powder gradually gathers toward the middle of the filter disc 7 and enters the interior of a discharge pipe 5 through an inlet 8 for collection.

[0056] Working principle: Magnetic powder and modified liquid 26 are placed inside the mixing chamber 6 and the liquid level of the modified liquid 26 is made higher than the surface of the filter disc 7. The filter disc 7 is driven to rotate by the driving mechanism 2. The material on the surface of the filter disc 7 is crushed by the collecting pressure rod 9 during rotation, and the filter disc 7 can be provided with corresponding filter holes to filter out the magnetic powder with too small an aperture, thereby making the particle size of the magnetic powder uniform. At the same time, the rotation of the filter disc 7 and the pressing of the collecting pressure rod 9 can make the modified liquid 26 and the magnetic powder fully mixed, thereby improving the modification effect. While rotating, the filter disc 7 is made to vibrate up and down by the vibration mechanism 11, thereby further improving the mixing effect of the modified liquid 26 and the magnetic powder. The filter disc 7 is concavely set, so that the magnetic powder gradually gathers to the middle of the filter disc 7 while vibrating. The collected liquid enters the discharge pipe 5 through the feed port 8 and is discharged and collected. The outer rod 13 rotates, and the outer rod 13 engages with the bevel gear 17 through the bevel tooth groove 15, thereby promoting the rotation of the bevel tooth groove 15. The bevel tooth groove 15 engages with the tooth groove 18, and the tooth groove 18 rotates with the rotation of the outer rod 13, thereby realizing the rotation drive of the filter disc 7 by the rotation of the outer rod 13, and improving the mixing effect by the rotation of the filter disc 7. By setting the inclined surface protrusion 28, the filter disc 7 continuously engages and staggers with the inclined surface protrusion 28 while rotating, so that the filter disc 7 oscillates up and down while rotating, thereby improving the mixing and filtering effect of the magnetic powder, and further, when the filter disc 7 is at the bottom of the up and down movement stroke, the filter disc 7 is located at the modified liquid 26. Below the surface, the discharge pipe 5 closes the feed port 8 to prevent the modified liquid 26 from entering the interior of the discharge pipe 5. When the filter disc 7 is at the top of the up and down movement, the filter disc 7 is separated from the modified liquid 26 and is located above the liquid level of the modified liquid 26. At this time, the feed port 8 is connected with the top of the discharge pipe 5 as the filter disc 7 rises, so that the magnetic powder is located above the liquid surface and accumulates with the continuous vibration and finally falls into the interior of the discharge pipe 5 through the feed port 8, thereby effectively controlling the loss of the modified liquid 26, improving the modification cost of the device, and also facilitating the subsequent sintering and molding of the magnetic powder. By the coaxial rotation of the drive rod 12 and the outer rod 13, the outer rod 13 is slidably pinned to the drive rod 12 through a pin key, so that the rotation of the drive rod 12 can drive the outer rod 13 to rotate synchronously, and the outer rod 1 3 and the driving rod 12 is provided with an elastic member 14, which can be a spring, etc., so that the limit ring 10 can move adaptively with the reciprocating filter disc 7 to avoid interference with the movement of the filter disc 7. The magnetic powder is magnetized by the external force, and some magnetized magnetic powder will be doped. While being squeezed and vibrated, the magnetic powder enters the interior of the outer sleeve 22 through the feed gap 20. Normal magnetic powder is discharged from the feed gap 20 as it vibrates. The rotating shaft 19 is divided into an adsorption rod 23 and a non-metallic rod 25. The rotating shaft 19 extends through the internal area of the limit ring 10 and adopts a non-metallic rod 25. The remaining part of the rotating shaft 19 adopts an adsorption rod 23. The adsorption rod 23 is made of magnetic metal material. The adsorption rod 23 can make the collecting pressure rod 9 press the magnetic powder.The magnetic powder in the magnetic powder has been magnetized by the external force and is adsorbed on the adsorption rod 23. As the magnetized magnetic powder accumulates, it is gradually transported inside the outer sleeve 22 by the action of the adsorption rod 23 and the spiral blade 21, and finally squeezed through the filter press plate 24 and entered one end of the non-metallic rod 25. The non-metallic rod 25 has no adsorption effect on the magnetized magnetic powder, thereby preventing the magnetized magnetic powder from being adsorbed into agglomerates and affecting the surface modification effect of the magnetic powder. At the same time, the magnetic powder agglomerates are further squeezed and crushed by the filter press plate 24 and then moved to the non-metallic rod 25. The magnetized powder is collected at 25, effectively preventing the magnetized powder from mixing with the magnetic powder and affecting the modification and subsequent sintering operations. In addition, a waste discharge pipe 3 is provided, and the waste discharge pipe 3 is connected to a negative pressure mechanism. After the magnetic powder is modified, the waste discharge pipe 3 is connected to the outer sleeve 22 to suck out the magnetized magnetic powder at the non-metallic rod 25. After the magnetized magnetic powder is demagnetized, it can be reused, thereby improving the utilization rate of the magnetic powder and achieving full reuse of the magnetic powder after magnetization by external force. At the same time, it can also reduce the impact on the magnetic powder modification.

Claims

1. A surface modification system for magnetic materials, comprising a reactor, characterized in that: The reactor is provided with a mixing chamber inside, a discharge pipe is provided through the middle of the mixing chamber, a filter disc is rotatably sleeved on the outer end of the discharge pipe, the filter disc is concavely arranged, and an oscillation mechanism is provided at the bottom of the filter disc to enable the filter disc to move up and down, the upper end surface of the filter disc is rotatably connected to a limiting ring, the side end surface of the limiting ring is rotatably connected to a collecting pressure rod that fits the surface of the filter disc, the bottom of the limiting ring is provided with a feeding port that fits the filter disc, and the limiting ring is driven and connected to a driving mechanism; The driving mechanism includes an outer rod, a driving gear and a bevel gear, wherein the driving gear is rotatably embedded in the inner wall of the limiting ring, the bevel gear is fixedly connected to the end of the driving gear away from the limiting ring, the outer rod is rotatably embedded in the interior of the limiting ring, and the bottom of the outer rod is provided with a bevel tooth groove meshing with the bevel gear, and the upper surface of the filter disc is embedded with a tooth groove meshing with the driving gear; The collecting pressure rod includes a rotating shaft, a feeding gap, a spiral blade and an outer sleeve. The outer sleeve is fixedly connected to the side end face of the limiting ring, and the outer sleeve is in contact with the surface of the filter disc. The feeding gap is opened inside the outer sleeve. The rotating shaft is rotatably arranged in the middle of the outer sleeve, and one end of the rotating shaft passes through the limiting ring and rotates coaxially with the driving gear. The spiral blade is wound around the outer end face of the rotating shaft and in contact with the inner wall of the outer sleeve. The rotating shaft includes an adsorption rod and a non-metallic rod, a filter press plate is provided at the junction of the adsorption rod and the non-metallic rod, the filter press plate is fixedly connected to the inner wall of the outer sleeve, and a waste discharge pipe is provided on the upper end face of the reactor, the waste discharge pipe passes through a limiting ring and is connected to one end of the outer sleeve that is attached to the non-metallic rod.

2. The surface modification system for magnetic materials according to claim 1, characterized in that: The oscillation mechanism includes a fixed ring and a bevel protrusion. The fixed ring is fixedly connected to the bottom of the mixing chamber and is sleeved with the discharge pipe. The bevel protrusion is fixedly connected to the upper end surface of the fixed ring. The bottom of the filter disc is provided with a bevel portion adapted to the bevel protrusion.

3. The surface modification system for magnetic materials according to claim 1, characterized in that: The inner part of the outer rod is sleeved with a driving rod via an elastic member. The driving rod extends through and extends to the outside of the reactor. The driving rod and the outer rod rotate coaxially.

4. The surface modification system for magnetic materials according to claim 1, characterized in that: The collecting pressure rods can be symmetrically arranged in multiple groups, and the feeding gaps can be symmetrically arranged along the surface of the outer sleeve.

5. A method for modifying a surface modification system of a magnetic material according to any one of claims 1 to 4, characterized in that: The magnetic powder and the modified liquid are placed inside the mixing chamber and the level of the modified liquid is higher than the surface of the filter disc. The driving mechanism drives the filter disc to rotate and drives the collecting pressure rod to crush the material on the surface of the filter disc. While the filter disc rotates, the vibration mechanism causes the filter disc to vibrate up and down. The filter disc is concave. While vibrating, the magnetic powder gradually gathers to the middle of the filter disc and enters the discharge pipe through the inlet for collection.

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