Neodymium-iron-boron mixture system and process thereof

Abstract

The application discloses a novel neodymium-iron-boron mixing system and a process thereof. The mixing system comprises a gas supply system, a feeding system, an exhaust system, a cooling system, a device main body, a processing system and a liquid adding system. The gas supply system, the feeding system, the exhaust system, the cooling system, the processing system and the liquid adding system are sequentially connected with the device main body. The device main body comprises a bottom plate. A lifting mechanism is arranged at the top end of the bottom plate. A cross beam is arranged at the top end of the lifting mechanism. A storage tank is arranged at one side of the bottom plate. A top cover is arranged at the top end of the storage tank. The top end of the top cover is fixedly connected with the other end of the cross beam. A mixing mechanism is arranged at the bottom of one end of the cross beam and penetrates through the top cover and is located in the storage tank. The application can realize continuous production, quantitative feeding, quantitative liquid adding, nano powder adding, automatic oxygen replacement and exhaust, nitrogen constant pressure protection, oxygen content monitoring, automatic stage mixing, cover opening-free cleaning of the storage tank, temperature monitoring, video monitoring, top cover lifting and other functions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of neodymium iron boron powder mixing production, in particular to a neodymium iron boron mixing system and process thereof. BACKGROUND

[0002] As a typical magnetic material, neodymium iron boron plays an important role in various fields of modern society. The preparation of neodymium iron boron magnetic material usually needs to go through the steps of material powder compounding (main alloy, auxiliary alloy, antioxidant, lubricant, etc.) - mixing - cold isostatic pressing - sintering and solid solution aging treatment to finally prepare a magnetic material with certain residual magnetism and coercive force. The performance of the magnetic material is closely related to the residual magnetism and coercive force. In the preparation process, the performance of the neodymium iron boron powder is an important factor affecting the performance of the magnetic material, directly affecting the performance of the magnetic material and the final performance of the magnetic material. For example, the flowability, bulk density, tap density, repose angle, shovel angle, collapse angle and other characteristics of the neodymium iron boron powder play a significant role in improving the magnetic properties of the magnetic material such as residual magnetism, coercive force and squareness. In the process of compounding, the main and auxiliary alloy powders and additives such as antioxidants and lubricants are compounded, then mixed to ensure uniform dispersion for the subsequent cold isostatic pressing - sintering and solid solution aging treatment steps, further ensuring the magnetic properties and coercive force of the neodymium iron boron magnetic material.

[0003] Currently, when mixing neodymium iron boron powder and additives, the additives are added to the neodymium iron boron powder at one time, and then the neodymium iron boron powder and the additives are mixed by mixing. In the process of mixing the neodymium iron boron powder and the additives, the material is usually mixed by a stirring rod, and the material adhering to the inner wall of the mixing barrel is removed by a scraper. However, the material at the bottom of the mixing barrel is difficult to mix with the material above by the stirring rod, resulting in uneven mixing. In addition, the scraper will be worn out after a long time of use, so that the scraper cannot remove the adhering material. Therefore, the existing technology often replaces the scraper to ensure the removal of the adhering material, which increases the maintenance cost and the workload of the workers. In addition, in the process of producing neodymium iron boron material, many enterprises often use a double-alloy mixing formula to improve the performance of the magnetic material, that is, two different grades and particle size distributions of neodymium iron boron alloy powders are mixed and then processed into a magnetic material together with additives such as antioxidants and lubricants to improve the overall performance of the magnetic material. However, due to the differences in material quality and particle size of the main and auxiliary alloys, the mixing effect of the powder material is not good, and the two alloy powders cannot be fully mixed together, which affects the subsequent sintering process and leads to unstable consistency of the magnetic material. No effective solution has been proposed to address the problems in the related art. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the defects of the prior art, the present application provides a neodymium iron boron mixing system and a process thereof, which has the advantages of uniform material mixing and scraper adjustment, thereby solving the problems of uneven material mixing and replacing the scraper to ensure the removal of adhered materials.

[0006] (II) Technical solutions

[0007] To achieve the above-mentioned advantages of uniform material mixing and scraper adjustment, the present application adopts the following specific technical solutions:

[0008] According to one aspect of the present application, a neodymium iron boron mixing system is provided, comprising a gas supply system, a feeding system, an exhaust system, a cooling system, a device main body, a processing system and a liquid adding system, the gas supply system, the feeding system, the exhaust system, the cooling system, the processing system and the liquid adding system are connected with the device main body in sequence, the device main body comprises a bottom plate; a lifting mechanism is arranged at the top end of the bottom plate, a cross beam is arranged at the top end of the lifting mechanism, a drive motor is arranged at the bottom of one end of the cross beam, a storage tank is arranged on one side of the bottom plate, a top cover is arranged at the top end of the storage tank, and the top end of the top cover is fixedly connected with the bottom of the other end of the cross beam; a mixing mechanism is arranged at the bottom of one end of the cross beam and penetrates through the top cover and is located inside the storage tank; an air inlet connected with the gas supply system, an exhaust outlet connected with the exhaust system, a feeding inlet connected with the feeding system, a video monitoring device, a liquid adding inlet and a sonic soot blower are arranged at the top end of the outside of the top cover in sequence; a cooling water inlet connected with the cooling system is arranged at the bottom of the outside of the storage tank, a cooling water outlet is arranged at the top of the outside of the storage tank, a temperature sensor is arranged at the middle of the outside of the storage tank, and a discharge valve is arranged at the bottom end of the storage tank.

[0009] Further, in order to realize the mixing and stirring of the material in the storage tank, so that the mixing of the materials is more sufficient, and the inner wall of the storage tank can be cleaned by the scraper, so that the material attached to the inner wall of the storage tank after long-term use is avoided, the workload of the workers is reduced, and the maintenance cost is reduced. In addition, after the scraper is worn, the scraper can be adjusted by the adjusting shaft, so that the inside of the storage tank is always cleaned, and the maintenance cost is reduced. The mixing mechanism comprises a driving shaft arranged at one end of the cross beam, a belt pulley one is arranged at the top end of the driving shaft and inside the cross beam, a spiral plate is arranged at the bottom of the outer side of the driving shaft, and a baffle is arranged outside the spiral plate; a cross bar is symmetrically arranged on the outer side of the middle of the driving shaft, a scraper is embedded at one end of the cross bar, a cavity is arranged at one end of the driving shaft and inside the scraper, and an adjusting mechanism is arranged inside the cavity; the adjusting mechanism comprises an adjusting shaft arranged through the cavity, and a bevel gear one is arranged at the bottom of the circumferential side wall of the adjusting shaft; a threaded rod is arranged through one side of the cavity, and a bevel gear two engaged with the bevel gear one is arranged at one end of the threaded rod; the cross section of the scraper is arranged in a V-shaped structure, and a threaded hole matched with the threaded rod is arranged at one end of the side wall of the scraper.

[0010] Further, in order to realize the driving of the driving shaft, the output shaft of the driving motor is sleeved with a belt pulley one inside one end of the cross beam, the top end of the driving shaft is sleeved with a belt pulley two inside the other end of the cross beam, and the belt pulley one and the belt pulley two are connected by a belt.

[0011] Further, in order to realize the addition of the material in the storage tank, the liquid adding system comprises a base, a clamp is arranged at the top of one side of the base, a syringe is arranged between the clamps, the clamps are provided with a cover plate, and a display screen is arranged on one side of the clamps; a servo motor is arranged at the bottom of the clamp, a transmission screw rod is arranged at the bottom end of the servo motor, and a key is arranged on one side of the servo motor; a three-way valve is arranged at the top end of the syringe, a liquid suction pipe is arranged at one end of the three-way valve, a liquid storage tank is arranged at one end of the liquid suction pipe, the other end of the three-way valve is provided with a liquid delivery pipe connected with a liquid adding port, and a needle tube is arranged at one end of the liquid delivery pipe and inside the liquid adding port; the feeding system comprises a stock bin, the bottom end of the stock bin is connected with a feeding port, and a glove box is arranged at the top end of the stock bin; from left to right, a nitrogen inlet, a pressure gauge, an oxygen content monitor and an air outlet are arranged at the top end of the glove box, an inlet gate is arranged at one end of the glove box, a glove port is arranged on one side of the glove box, and a feeding valve is arranged at the bottom end of the glove box.

[0012] Further, in order to realize monitoring of the mixing condition of the materials in the storage tank, so that the mixing state of the materials in the storage tank can be more clearly understood, and at the same time, through the setting of the dust scraper, the dust on the lens surface can be cleaned, so that the dust on the lens surface is prevented from covering too much and causing the inside of the storage tank to be monitored, in addition, the plastic film can prevent the dust from being adsorbed in the gap and hindering the rotation of the connecting rod, the video monitoring device comprises a connecting rod penetratingly arranged at the top end of the top cover, and the connecting rod is connected with the top cover through the connecting flange one, one end of the connecting rod is provided with a junction box, the other end of the connecting rod is provided with a camera, one side of the camera is provided with an illuminating light source, the bottom end of the camera is provided with a lens, the inside of one side of the lens is provided with a cleaning motor, one end of the output shaft of the cleaning motor is provided with a dust scraper, and the connecting rod and the camera are externally sleeved with a plastic film.

[0013] Further, in order to be able to drive the sound wave generator by compressed nitrogen, amplify through the sound amplifier, transmit sound wave energy to the accumulated powder area, use sound energy to make the accumulated ash particles reciprocating vibration to separate from the surface of the equipment, so as to achieve the purpose of removing the accumulated powder, the sound wave soot blower penetrates the sound amplifier of the top cover, the sound amplifier is connected with the top cover through the connecting flange two, and the top end of the sound amplifier is provided with a sound wave generator, one side of the sound wave generator is provided with a nitrogen inlet.

[0014] According to another aspect of the present application, a neodymium iron boron mixing process is provided, which comprises the following steps:

[0015] Step one, preliminary preparation, check and confirm whether the gas source pressure and gas quantity of nitrogen and compressed air are sufficient;

[0016] Step two, oxygen content confirmation, ensure that the oxygen content in the mixing system is lower than 20ppm before feeding;

[0017] Step three, quantitative feeding, add the pre-set material to the inside of the equipment body through the feeding system;

[0018] Step four, quantitative liquid adding, add the pre-configured solution to the inside of the equipment body through the liquid adding system;

[0019] Step five, adding solid additives, add solid additives to the inside of the bin through the glove box;

[0020] Step six, material mixing, mix the materials through the equipment body;

[0021] Step seven, discharging, after the mixing process is completed, discharge through the discharge valve;

[0022] Step eight, cover opening and cleaning, when replacing internal spare parts or equipment maintenance and repair, the powder in the passivation storage tank needs to be opened and the top cover is opened;

[0023] Step nine, if necessary to stop, then need to empty the silo.

[0024] (III) Advantages

[0025] Compared with the prior art, the present application provides a neodymium iron boron mixing system and process, which has the following beneficial effects:

[0026] (1) The present application can realize continuous production, quantitative feeding, quantitative liquid addition, nano powder addition, automatic replacement of oxygen, nitrogen constant pressure protection, oxygen content monitoring, automatic stage mixing, cover-free cleaning of the storage tank, temperature monitoring, video monitoring, top cover lifting and other functions, with high automation degree, visualized parameters, high process optimization freedom, and can realize modification of neodymium iron boron powder particles, handle solid-liquid mixing and solid-solid mixing, especially the solid-solid mixing process, which can uniformly mix a small amount of nano powder additive with neodymium iron boron alloy powder, which is not achieved by ordinary three-dimensional mixers; the present application can also modify the powder of recycled neodymium iron boron waste, and the powder flowability and squareness are close to those of newly prepared neodymium iron boron powder, which is very important in the production process of neodymium iron boron magnets.

[0027] (2) By setting the mixing mechanism, the mixing and stirring of the materials in the storage tank are realized, so that the mixing of the materials is more sufficient, and the inner wall of the storage tank can be cleaned by the scraper rod, which can avoid the attachment of materials on the inner wall of the storage tank after long-term use, reduce the workload of the workers, and the scraper rod can be adjusted by the adjusting shaft after wear, so that the inside of the storage tank is always cleaned, thereby reducing the maintenance cost.

[0028] (3) By setting the video monitoring device, the mixing of the materials in the storage tank is monitored, so that the mixing state of the materials in the storage tank can be more clearly understood, and the dust on the lens surface can be cleaned by the dust scraper, so that the lens surface is not covered with too much dust, which prevents the inside of the storage tank from being monitored, and the plastic film prevents the dust from being adsorbed in the gap and hindering the rotation of the connecting rod.

[0029] (4) By setting the acoustic soot blower, the sound wave generator can be driven by compressed nitrogen, the sound wave energy can be transmitted to the powder accumulation area through the sound amplifier, and the accumulated ash particles can be vibrated reciprocally to separate from the surface of the equipment, so as to achieve the purpose of removing the accumulated powder. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments will be briefly introduced. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Fig. 1 is a structural schematic diagram of a neodymium iron boron mixing system according to an embodiment of the present application;

[0032] Fig. 2 is a structural schematic diagram of a device main body in a neodymium iron boron mixing system according to an embodiment of the present application;

[0033] Fig. 3 is a partial schematic diagram of a device main body in a neodymium iron boron mixing system according to an embodiment of the present application;

[0034] Fig. 4 is a structural schematic diagram of a mixing mechanism in a neodymium iron boron mixing system according to an embodiment of the present application;

[0035] Fig. 5 is Fig. 4 is a partial enlarged view of A in FIG. 8;

[0036] Fig. 6 is a partial schematic diagram of a feeding system in a neodymium iron boron mixing system according to an embodiment of the present application;

[0037] Fig. 7 is a partial schematic diagram of a liquid adding system in a neodymium iron boron mixing system according to an embodiment of the present application;

[0038] Fig. 8 is a structural schematic diagram of an acoustic soot blower in a neodymium iron boron mixing system according to an embodiment of the present application;

[0039] Fig. 9 is a structural schematic diagram of a video monitoring device in a neodymium iron boron mixing system according to an embodiment of the present application;

[0040] Fig. 10 is a structural schematic diagram of a neodymium iron boron mixing system according to an embodiment of the present application; Fig. 9 is a partial enlarged view of B in FIG. 9.

[0041] in the drawings:

[0042] 1, gas supply system; 2, feeding system; 201, silo; 202, glove box; 203, nitrogen inlet; 204, pressure gauge; 205, oxygen content monitor; 206, air outlet; 207, inlet gate; 208, glove port; 209, feeding valve; 3, exhaust system; 4, cooling system; 5, equipment main body; 6, processing system; 7, liquid adding system; 701, base; 702, clamp; 703, syringe; 704, cover plate; 705, display screen; 706, servo motor; 707, transmission screw; 708, key; 709, three-way valve; 710, liquid suction tube; 711, liquid storage tank; 712, liquid delivery tube; 713, needle tube; 8, bottom plate; 9, lifting mechanism; 10, drive motor; 11, storage tank; 12, top cover; 13, mixing mechanism; 1301, drive shaft; 1302, spiral plate; 1303, baffle; 1304, cross bar; 1305, scraping rod; 1306, chamber; 1307, adjusting shaft; 1308, bevel gear one; 1309, threaded rod; 1310, bevel gear two; 14, air inlet; 15, air outlet; 16, feeding port; 17, video monitoring device; 1701, connecting rod; 1702, connecting flange one; 1703, junction box; 1704, camera; 1705, illumination light source; 1706, lens; 1707, cleaning motor; 1708, dust scraping plate; 18, liquid adding port; 19, acoustic sootblower; 1901, loudspeaker; 1902, connecting flange two; 1903, acoustic generator; 1904, nitrogen inlet; 20, cooling water inlet; 21, cooling water outlet; 22, temperature sensor; 23, discharging valve. DETAILED DESCRIPTION

[0043] To further explain the embodiments, the present application provides drawings which are part of the disclosure of the present application, mainly used to illustrate the embodiments, and can explain the operating principle of the embodiments in conjunction with the related description of the specification. Those of ordinary skill in the art should understand other possible implementations and advantages of the present application by referring to these contents. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0044] According to an embodiment of the present application, a neodymium iron boron mixing system and a process thereof are provided.

[0045] The present application will be further described in conjunction with the drawings and specific embodiments. As Figs. 1-10As shown, according to one embodiment of the application, a neodymium iron boron mixing system is provided, comprising a gas supply system 1, a feeding system 2, an exhaust system 3, a cooling system 4, a device body 5, a processing system 6 and a liquid adding system 7, which are sequentially connected with the device body 5, the device body 5 comprising a bottom plate 8; the top end of the bottom plate 8 is provided with a lifting mechanism 9, the top end of the lifting mechanism 9 is provided with a cross beam, one end of the cross beam is provided with a driving motor 10 at the bottom, one side of the bottom plate 8 is provided with a storage tank 11, the top end of the storage tank 11 is provided with a top cover 12, and the top end of the top cover 12 is fixedly connected with the other end of the cross beam at the bottom; one end of the cross beam is provided with a mixing mechanism 13 penetrating through the top cover 12 and located inside the storage tank 11; the top end of the top cover 12 is sequentially provided with an air inlet 14 connected with the gas supply system 1, an exhaust port 15 connected with the exhaust system 3, a feeding port 16 connected with the feeding system 2, a video monitoring device 17, a liquid adding port 18 and a sonic soot blower 19; the bottom of the outside of the storage tank 11 is provided with a cooling water inlet 20 connected with the cooling system 4, the top of the outside of the storage tank 11 is provided with a cooling water outlet 21, the middle of the outside of the storage tank 11 is provided with a temperature sensor 22, and the bottom end of the storage tank 11 is provided with a discharge valve 23.

[0046] In addition, in specific applications, the lifting mechanism 9 further comprises a hydraulic system, a lifting rod and the like, and the lifting mechanism 9 is a prior art, which will not be described in detail here.

[0047] With the above technical scheme of the application, the application can realize the functions of continuous production, quantitative feeding, quantitative liquid adding, nano powder adding, automatic oxygen replacement and discharge, nitrogen constant pressure protection, oxygen content monitoring, automatic stage mixing, storage tank cleaning without opening the cover, temperature monitoring, video monitoring, top cover lifting and the like, has high automation degree, visualized parameters, high process optimization freedom, can realize the modification of neodymium iron boron powder particles, can process solid-liquid mixing and solid-solid mixing, especially the solid-solid mixing process, can uniformly mix a small amount of nano powder additive with neodymium iron boron alloy powder, which cannot be realized by ordinary three-dimensional mixers; the application can also modify the powder of recycled neodymium iron boron waste materials, and the powder flowability and squareness are close to those of newly prepared neodymium iron boron powder, which is very important in the production process of neodymium iron boron magnets.

[0048] In one embodiment, for the mixing mechanism 13 described above, the mixing mechanism 13 includes a drive shaft 1301 arranged at the bottom of one end of the cross beam, the top end of the drive shaft 1301 is arranged inside the cross beam and provided with a belt pulley I, the bottom of the outer side of the drive shaft 1301 is provided with a spiral plate 1302, and the outer side of the spiral plate 1302 is provided with a baffle 1303; the outer side of the middle of the drive shaft 1301 is symmetrically provided with a cross rod 1304, one end of the cross rod 1304 is embedded with a scraping rod 1305, the inside of the drive shaft 1301 and one end of the scraping rod 1305 are provided with a cavity 1306, and the inside of the cavity 1306 is provided with an adjusting mechanism; the adjusting mechanism includes an adjusting shaft 1307 arranged through the inside of the cavity 1306, and the bottom of the circumferential side wall of the adjusting shaft 1307 is sleeved with a bevel gear I 1308; one side of the cavity 1306 is provided with a threaded rod 1309 arranged through, and one end of the threaded rod 1309 is sleeved with a bevel gear II 1310 engaged with the bevel gear I 1308; the cross section of the scraping rod 1305 is arranged in a V-shaped structure, and the side wall of one end of the scraping rod 1305 is provided with a threaded hole matched with the threaded rod 1309, thereby realizing the mixing and stirring of the materials in the storage tank 11, so that the mixing of the materials can be more sufficient, and the inner wall of the storage tank 11 can also be cleaned by the scraping rod 1305, which can avoid the attachment of materials on the inner wall of the storage tank 11 after long-term use, reduce the workload of the workers, and further reduce the maintenance cost.

[0049] The working principle of the mixing mechanism 13 is as follows: the output shaft of the driving motor 10 drives the belt pulley I to rotate, which drives the belt pulley II to rotate under the action of the belt, thereby driving the drive shaft 1301 to rotate, and then driving the materials to be mixed and stirred under the action of the spiral plate 1302 and the baffle 1302, so that the bottom materials can be mixed with the upper materials, and the inner wall of the storage tank 11 is cleaned under the rotation of the scraping rod 1305; when the scraping rod 1305 needs to be adjusted, the adjusting shaft 1307 is rotated to drive the bevel gear I 1308 to rotate, thereby driving the threaded rod 1309 to rotate under the meshing action of the bevel gear I 1308 and the bevel gear II 1310, and the scraping rod 1305 is moved under the cooperation of the threaded rod 1309 and the threaded hole, thereby realizing the adjustment of the scraping rod 1305, so that the scraping rod 1305 can still clean the inner wall of the storage tank 11 after wear by adjustment.

[0050] In one embodiment, for the above-mentioned driving motor 10, the output shaft of the driving motor 10 and inside the end of the crossbeam is sleeved with pulley one, the top end of the driving shaft 1301 and inside the other end of the crossbeam is sleeved with pulley two, and pulley one and pulley two are connected through a belt, thereby achieving the driving of the mixing mechanism 13.

[0051] In one embodiment, for the above-mentioned liquid adding system 7 and the feeding system 2, the liquid adding system 7 comprises a base 701, the top of one side of the base 701 is provided with clamps 702, the clamps 702 are provided with syringes 703 between them, the clamps 702 are provided with cover plates 704, and one side of the clamps 702 is provided with a display screen 705; the bottom of the clamps 702 is provided with a servo motor 706, the bottom end of the servo motor 706 is provided with a transmission screw 707, one side of the servo motor 706 is provided with a button 708; the top end of the syringe 703 is provided with a three-way valve 709, one end of the three-way valve 709 is provided with a suction tube 710, one end of the suction tube 710 is provided with a liquid storage tank 711, the other end of the three-way valve 709 is provided with a liquid delivery tube 712 connected with the liquid inlet 18, and the end of the liquid delivery tube 712 and inside the liquid inlet 18 is provided with a needle tube 713; the feeding system 2 comprises a stock bin 201, the bottom end of the stock bin 201 is connected with the feeding inlet 16, and the top end of the stock bin 201 is provided with a glove box 202; the top end of the glove box 202 is sequentially provided with a nitrogen inlet 203, a pressure gauge 204, an oxygen content monitor 205, and an air outlet 206 from left to right, one end of the glove box 202 is provided with an inlet gate 207, one side of the glove box 202 is provided with a glove port 208, and the bottom end of the glove box 202 is provided with a feeding valve 209, thereby achieving the addition of materials inside the stock tank 11.

[0052] In one embodiment, for the above-mentioned video monitoring device 17, the video monitoring device 17 comprises a connecting rod 1701 arranged through the top end of the top cover 12, and the connecting rod 1701 is connected with the top cover 12 through a connecting flange 1702, one end of the connecting rod 1701 is provided with a junction box 1703, the other end of the connecting rod 1701 is provided with a camera 1704, one side of the camera 1704 is provided with an illuminating light source 1705, the bottom end of the camera 1704 is provided with a lens 1706, one side of the lens 1706 is internally provided with a cleaning motor 1707, one end of the output shaft of the cleaning motor 1707 is provided with a dust scraper 1708, the connecting rod 1701 and the camera 1704 are externally sleeved with a plastic film, so as to realize monitoring the mixing condition of the materials in the storage tank 11, so as to more clearly realize the mixing condition of the materials in the storage tank 11, at the same time, through the setting of the dust scraper 1708, the dust on the surface of the lens 1706 can be cleaned, so as to prevent the dust on the surface of the lens 1706 from covering too much to cause the condition that the inside of the storage tank 11 cannot be monitored, in addition, through the plastic film, the dust can be prevented from being adsorbed in the gap to hinder the rotation of the connecting rod.

[0053] In one embodiment, for the above-mentioned acoustic soot blower 19, the acoustic soot blower 19 penetrates the loudspeaker 1901 of the top cover 12, the loudspeaker 1901 is connected with the top cover 12 through a connecting flange 1902, the top end of the loudspeaker 1901 is provided with a sound wave generator 1903, one side of the sound wave generator 1903 is provided with a nitrogen inlet 1904, so as to drive the sound wave generator 1903 through compressed nitrogen, amplify through the loudspeaker 1901, transmit sound wave energy to the powder accumulation area, utilize sound energy to make the accumulated dust particles reciprocating vibration to separate from the surface of the equipment, and achieve the purpose of removing the accumulated dust.

[0054] In addition, in specific application, the mixing system has the following equipment characteristics:

[0055] 1. Quantitative feeding, the system is provided with a quantitative powder weighing system, and is connected with the equipment control system, automatic powder feeding is realized by inputting the weight of the material on the PLC control panel;

[0056] 2. Quantitative liquid adding, the system is provided with a quantitative liquid adding system and is connected with the equipment control system, quantitative liquid adding is realized by inputting liquid adding speed, liquid adding time / liquid adding amount on the PLC control panel, and intermittent liquid adding can also be realized by setting interval time; the syringe 703 is fixed on the base 701 through the clamp 702 and the cover plate 704, and the piston tail of the syringe 703 is fixed on the servo motor; the quantitative liquid adding system adopts the mode that the servo motor 706 uniformly pushes the syringe 703, and the pushing speed of the servo motor 706 is controlled by the PLC program; the syringe 703 has a three-way valve 709 at the front end, when the three-way valve 709 opens the channel connecting the liquid storage tank 711 of the syringe 703, the servo motor 706 is started to retreat, and the syringe 703 sucks a certain amount of liquid; when the three-way valve 709 opens the liquid adding port 18 connected with the syringe 703, the servo motor is started to advance to push the syringe 703 to pump the liquid into the liquid adding port 18.

[0057] 3. Adding nano powder, in order to facilitate the addition of nano powder, a small glove box 202 is arranged on the upper part of the hopper 201, vacuum packaged nano powder is sent in through the inlet gate 207, the glove box 202 is pumped to negative pressure from the exhaust port 206 by a vacuum pump, nitrogen is supplemented to 3KPa through the nitrogen inlet 203, and the above process is repeated three times; then the nano powder packaging bag is opened, the feeding valve 209 is opened, the nano powder is poured into the hopper, and the feeding valve is closed after the end.

[0058] 4. Automatic oxygen replacement, the system needs to carry out nitrogen replacement oxygen removal process before running. In order to facilitate fast and efficient oxygen removal, a vacuum pump is arranged at the rear end of the exhaust filter, and the oxygen is removed by the mode of vacuumizing the system pipeline and the storage tank 11, filling nitrogen, vacuumizing, filling nitrogen, vacuumizing and filling nitrogen. The oxygen content can be reduced to below 20ppm by using high-purity nitrogen replacement for three times. The whole replacement oxygen removal process is completely controlled by the PLC program to automatically control the electromagnetic valve; considering the pressure resistance problem of the feeding port and the discharge port soft connection, the butterfly valve at the upper end of the hopper and the butterfly valve at the upper end of the discharge port soft connection are selected to be closed before automatic oxygen removal; after the oxygen removal of the storage tank 11 and the main system pipeline is completed, the feeding port 16 and the discharge valve 23 also need to be replaced; due to the small space of the interface, the nitrogen replacement oxygen removal is carried out in the mode of side passing and side removing.

[0059] 5. Nitrogen constant pressure protection, because Nd-Fe-B powder is easy to oxidize, the powder mixing process needs to be carried out under nitrogen protection, in order to prevent the organic additives from being taken away by the gas in the storage tank 11 during the mixing process, the exhaust valve is closed during the mixing process, and a micro-positive pressure of 3-5 KPa is maintained in the equipment system. The entire equipment system is good in sealing, if the dynamic seal is not tight due to the high-speed rotation of the driving shaft 1301, causing the pressure to drop, the control system will automatically compensate the pressure. A proportional valve is installed at the exhaust end, which effectively controls the pressure of the equipment system to be maintained at 3-5 KPa during the replacement of nitrogen with oxygen. When high-speed rotation mixing occurs, the pressure rises, in order to prevent the proportional valve from being over-pressured, the control system will automatically increase the control pressure of the proportional valve after the blade rotates, and the increase value can be set by itself.

[0060] 6. Oxygen content monitoring, the system is also equipped with 4 oxygen meters installed at the gas inlet end, the exhaust end, the feed inlet end and the discharge end, which can monitor the oxygen content in the system pipeline in real time, in order to prevent the organic additives from being taken away by the gas in the storage tank 11 during the mixing process, the exhaust end oxygen meter is connected to the equipment system pipeline to form a closed loop oxygen measurement. The real-time oxygen meter is installed at the gas inlet end to detect whether the oxygen content of the nitrogen gas source meets the standard. The oxygen meters are installed at the feed inlet and discharge valve to facilitate the oxygen discharge at the interface to meet the standard.

[0061] 7. Automatic stage mixing, the system mixing process is controlled by PLC program, in order to increase the process freedom, multiple stages of automatic operation can be set, the time and speed of each stage are input, the program runs according to the set stage sequence, and an alarm is prompted after the running is completed.

[0062] 8. Transparent anti-static soft connection, in order to facilitate the connection with the storage tank 11, transparent anti-static soft connections are installed at the feed inlet and discharge valve. The two ends of the soft connection are connected by quick chuck, which is convenient and fast. The soft connection is made of polyurethane material, which is effective in resisting static electricity and suitable for flammable powder; the inner wall is smooth to prevent powder from hanging and sticking; it is transparent and visible, which facilitates the observation of the material flow, and judges whether the material is discharged during the feeding and discharging process. The soft connection has certain pressure resistance and can withstand a positive pressure of 18 KPa.

[0063] 9. Cleaning the storage tank 11 without opening the cover, the top cover 12 of the storage tank 11 is provided with a small-sized acoustic blowing device, a 0.5-0.6 MPa compressed nitrogen gas is used to drive the acoustic generator, which is amplified by the sound amplification cylinder to transmit acoustic energy to the powder accumulation area, so that the accumulated ash particles produce reciprocating vibration to separate from the surface of the equipment, thereby achieving the purpose of removing the accumulated powder. The accumulated powder in the storage tank 11 is discharged through the discharge valve and the rotation of the driving shaft 1301.

[0064] 10. Video monitoring inside storage tank 11: The top cover 12 of storage tank 11 is equipped with a camera and a light source 1705. The connecting rod 1701 of camera 1704 can rotate 360°. A plastic film covers the connecting rod 1701 to prevent dust from adhering to the gaps and hindering the rotation of the connecting rod. A dust scraper 1708 is installed outside the lens of camera 1704 to clean the dust adhering to the lens. The video image is transmitted to the background touch screen via a signal cable. If the image is blurry, a button on the touch screen can be clicked to activate the dust scraper 1708 to clean the lens 1706.

[0065] 11. Temperature monitoring inside storage tank 11: To avoid adverse effects caused by material temperature rise during mixing, storage tank 11 is equipped with a cooling water jacket on the outside, using a bottom-in, top-out method for heat exchange. A temperature sensor is installed on the side of storage tank 11; the sensing point can contact the powder inside the cavity but not the scraper 1305. The inner wall of storage tank 11 is flush with the surface. The circulating water pump is equipped with a frequency converter; the equipment control system can automatically adjust the frequency converter based on material temperature feedback, thereby regulating the circulating water flow rate to achieve automatic temperature control.

[0066] 12. Continuous production: A hopper 201 is installed at the inlet of storage tank 11 for material storage and buffering. Butterfly valves are installed at the top of the hopper and the bottom of the discharge port to facilitate oxygen purging at the interface and continuous tank replacement. After each feeding, butterfly valves D3 and D2 are closed, the empty tank is removed, and a small amount of powder adsorbed at the valve and interface is purged with an air gun. The tank is then replaced with a full tank, and the oxygen at the interface is purged after the new tank is installed. Once the oxygen content reaches the standard, material can be fed into hopper 201 again. After each discharge, butterfly valves D5 and D6 are closed, the full tank is removed, and a small amount of powder adsorbed at the valve and interface is purged with an air gun. The tank is then replaced with a full tank, and the oxygen at the interface is purged after the new tank is installed. Once the oxygen content reaches the standard, the tank awaits the next discharge. This process of continuously replacing tanks to feed into hopper 201, followed by quantitative weighing and discharging of powder and quantitative addition of liquid, and finally discharging into the storage tank after mixing, is repeated after each batch is mixed, achieving continuous production.

[0067] 13. The top cover 12 is raised and lowered. For convenient maintenance and replacement of spare parts, the system is equipped with a lifting mechanism 9 and a mechanical brake function. Limit switches are provided at the highest and lowest points of the lifting and lowering, allowing the cover and mixing mechanism 13 to rise and fall together. The mechanism can stop at any time during the lifting and lowering process and automatically stop at the highest and lowest points. If the powder accumulated in the storage tank 11 is difficult to clean and it is necessary to open the cover for cleaning, the cover bolts should be loosened and the top cover 12 raised for cleaning after the powder in the storage tank 11 has been completely passivated.

[0068] 14. Overpressure protection, install safety valve at air pocket and compressed air inlet, when pressure exceeds the set value, safety valve automatically releases pressure to avoid damage to pipeline and equipment components due to excessive pressure or failure of pressure reducing valve, even threaten personal safety.

[0069] According to another embodiment of the present application, there is provided a Nd-Fe-B mixing process, comprising the following steps:

[0070] Step one, preliminary preparation, check and confirm whether the gas source pressure and gas volume of nitrogen and compressed air are sufficient;

[0071] Specifically, check and confirm that valves S1, S2, S7, S4, S6, S5, S10, ES7, S8, S9, S12, S13, D1, D7, D4 are opened, and the remaining valves are in closed state. Check whether the setting value of pressure reducing valve is accurate (J1: 0.5MPa, J2: 20KPa, J3: 0.5MPa, J4: 10KPa, J5: 10KPa). Open valve S3, detect whether the oxygen content of gas source meets the standard, maintain detection time for 5min, if not, replace the gas source, if yes, proceed to the next step. Connect the feed tank and storage tank according to the equipment system diagram, and ensure that the oxygen content of empty storage tank meets the standard (less than 20ppm), the pressure of feed tank is 10-15KPa, the pressure of empty storage tank is 10-15KPa, and the tank butterfly valves D3, D6 are in closed state. Turn on the equipment, check whether the oxygen analyzer and all instruments are in normal operation, set the exhaust proportional valve CS1 to 5KPa, start the circulating water pump, and adjust the water flow to 8m 3 / min.

[0072] Step two, oxygen content confirmation, ensure that the oxygen content in the mixing system is less than 20ppm before feeding, and then proceed to mixing operation;

[0073] Specifically, when the oxygen content does not meet the standard, oxygen removal work is needed, first close the butterfly valves D2, D5 before the soft connection to prevent damage to the soft connection during oxygen removal.

[0074] Start the automatic replacement of the main cavity button, the system automatically performs the following operations: open the three-way valve ES8 to communicate with the vacuum pump and the cavity, start the vacuum pump to extract the gas in the cavity, and close the vacuum pump and the three-way valve ES8 to communicate with the proportional valve CS1 and the cavity after reaching the preset vacuum degree; open the valves ES1, ES3, ES4 to charge the cavity, when the pressure in the cavity reaches 3KPa, open the three-way valve ES8 and start the vacuum pump to extract the gas in the cavity, and close the vacuum pump and the three-way valve ES8 to communicate with the proportional valve CS1 and the cavity after reaching the preset vacuum degree; open ES1, ES3, ES4 to charge the cavity, when the pressure in the cavity reaches 3KPa, open the three-way valve ES8 and start the vacuum pump to extract the gas in the cavity, and close the vacuum pump and the three-way valve ES8 to communicate with the proportional valve CS1 and the cavity after reaching the preset vacuum degree; open ES1, ES3, ES4 to charge the cavity, when the pressure in the cavity reaches 3KPa, continue to charge, and when the pressure in the cavity exceeds 5KPa, the proportional valve CS1 automatically opens to exhaust outward. At this time, the control system opens ES13, opens the three-way valve ES12 to communicate with the oxygen meter, maintains 5min of exhaust oxygen measurement, and if the oxygen content meets the standard, the system terminates the main cavity replacement oxygen exhaust, closes ES1, ES4, ES3, ES13, ES12, otherwise continues to charge-exhaust operation. After the main cavity replacement is completed, the system alarms and automatically closes the pneumatic ball valve D4.

[0075] After the main cavity replacement is completed, start the automatic replacement of the feed port and discharge port button, the system automatically performs the following operations: automatically open the valves ES6, ES3, ES5 to maintain the exhaust oxygen measurement of the feed port; open the valves ES2, ES11, and close the three-way valve ES12 to communicate with the valve ES11 and the oxygen meter to maintain the exhaust oxygen measurement of the discharge port. When the oxygen content detected by the two oxygen meters meets the standard, the system automatically closes the valves ES6, ES3, ES5 and the valves ES2, ES11, and ends the replacement oxygen exhaust process.

[0076] After the oxygen content of the discharge port meets the standard, open the butterfly valve D6 to open the valve ES11 to exhaust outward (at this time, the three-way valve ES12 should be in a closed state to communicate the valve ES11 and the oxygen meter), so that the pressure of the storage tank is between 2-3KPa, which is close to the pressure of the main equipment cavity and lower than the pressure in the cavity, which reduces the pressure difference impact on the valve and is more conducive to downward discharge. After the pressure reduction is completed, close the valve ES11.

[0077] Note: When the three-way electromagnetic valve ES8 is in a closed state, open the channel of the communication valve S8 and the proportional valve CS1; when the three-way electromagnetic valve ES8 is in an open state, open the channel of the communication valve S8 and the vacuum pump; when the three-way electromagnetic valve ES12 is in a closed state, open the channel of the communication valve ES11 and the oxygen meter; when the three-way electromagnetic valve ES12 is in an open state, open the channel of the communication valve ES13 and the oxygen meter.

[0078] Step three, quantitative feeding, add pre-set material to the inside of the equipment body 5 through the feeding system 2;

[0079] Specifically, first, the powder in the storage tank 11 is poured into the feed bin: manually open the butterfly valve D2, and then open the slow butterfly valve D3 to pour the powder. In order to empty the powder in the storage tank 11, the conical surface of the tank is knocked with a rubber hammer. Whether the storage tank 11 has accumulated powder can be determined by knocking the storage tank 11. If the powder in the storage tank 11 is blocked, the butterfly valve D3 can be closed first, and then the storage tank 11 is filled with appropriate amount of nitrogen, and the pressure is increased to 18KPa. Open valve S11 to exhaust, reduce the pressure of the bin to 5KPa, and close valve S11. Then open the butterfly valve D3, and knock the storage tank 11 with a rubber hammer. Whether the material is emptied can be determined by observing whether the material falls through the transparent flexible connection. The pressure difference between the tank and the bin is conducive to the downward injection of the powder. Finally, the butterfly valves D3 and D2 are opened and closed several times, and the rubber hammer is knocked near the butterfly valve to ensure that the material is poured clean. After the pouring is finished, the butterfly valves D3 and D2 are closed.

[0080] If the storage tank 11 is replaced and the powder is added to the bin, the connecting clamp of the storage tank 11 is removed, the next storage tank 11 is connected to the feeding port, and the clamp is locked. The oxygen in the feeding port is replaced by pressing the button on the touch screen. After the oxygen content meets the standard, the next step of pouring the powder in the storage tank 11 into the bin is performed.

[0081] Quantitative powder weighing and pouring: first manually open the butterfly valve D1 (maximum opening), input the weight of the powder to be poured through the touch screen and click the quantitative pouring button, and the control system automatically checks the limit switch of the butterfly valve D1 to confirm that the valve is in the open state. After the automatic start of the powder weighing machine, the powder is vibrated and weighed from the bin, and then the powder is poured into the cavity. After the pouring is finished, the system automatically closes the powder weighing machine. After receiving the prompt that the pouring is finished, manually close the butterfly valve D1.

[0082] Step four, quantitative liquid addition, add pre-configured solution to the inside of the equipment body 5 through the liquid addition system 7;

[0083] Specifically, first, quantitatively add liquid system 7 vertical installation, ensure that the syringe 703 nozzle vertical upward. Rotate the three-way valve 709 with the syringe 703 and liquid tank 711 communication, manual operation button to servo motor to advance the syringe 703 piston to the top, to drive the syringe 703 gas. Manual operation button to servo motor to pull the syringe 703 piston to the bottom, the liquid tank 711 is pumped into the syringe 703. Slowly operate the button to servo motor 706 to advance the syringe 703 piston, to drive the syringe 703 top air. The air in the syringe 703 is driven out, rotate the three-way valve 709 with the main device cavity and syringe 703 communication. Through the liquid system 7 button or main device touch screen input liquid addition X, injection speed v, (before the experiment set the default value of the liquid addition system: the length of the syringe 703 cavity L, syringe diameter d, infusion tube volume Y), start automatic injection mode, servo motor 706 to advance the syringe 703 piston, pump X+Y liquid volume, where the infusion tube 712 remains liquid volume Y, to the main device cavity at a constant speed v injection liquid volume X, and then servo motor 706 to pull the syringe 703 piston, the infusion tube 712 remains liquid back to the syringe 703, thus the liquid addition is completed.

[0084] Step five, add solid additives, through the glove box 202 to the inside of the silo 201 to add solid additives;

[0085] Specifically, the solid additive is vacuum packaged and sent to the silo 201 feeding glove box 202. The glove box 202 is pumped to negative pressure by the vacuum pump, and nitrogen is filled to 3KPa pressure. The vacuum-pumping and gas-filling operation is repeated three times. After the oxygen content is below 20ppm, the vacuum packaging bag is opened with scissors, and the feeding valve is opened. After the air pressure stabilizes, a certain amount of nano powder is accurately weighed on the balance and poured into the silo through the feeding valve 209.

[0086] It is worth noting that: before adding a small amount of solid nano powder, the silo 201 should be emptied, and then the neodymium iron boron powder is added to the silo 201 in two times, each time adding half of the single mixing amount of neodymium iron boron powder to the silo 201, and adding solid nano powder between the two times. This ensures that the nano powder additive is in the middle of the single mixed neodymium iron boron powder, reducing the loss of nano powder and making it easier to mix evenly.

[0087] Step six, material mixing, through the device main body 5 to mix the material;

[0088] Specifically, the mixing process is in automatic mode, which is very suitable for processes with complex and long mixing procedures. It can preset a multi-stage automatic mixing program and input the speed and time of each stage. After the mixing condition setting is completed, click the automatic mixing button, the control system automatically checks the limit switch of the butterfly valve D1, confirms that the valve is in the closed state, and starts the mixing program.

[0089] The mixing condition is set in advance, the pre-quantitative liquid feeding system is prepared, and after the feeding into the cavity is completed, the automatic mixing is started, and the automatic injection mode of the liquid feeding system is started. In order to better mix, avoid the liquid from being concentrated in a local part and being difficult to disperse, and even being stuck on the inner wall of the cavity to cause powder accumulation. We use the method of mixing while feeding to adapt the feeding speed / time to the mixing speed / time, avoid feeding liquid at high speed, and easily blow liquid drops to the inner wall, which can easily cause powder accumulation.

[0090] Specifically, taking 40 kg of single-specification neodymium-iron-boron powder and 20 mL of liquid additive as an example, the feeding speed is 2 mL / min, the 200 r / min counterclockwise rotation feeding time is 10 min, the 300 r / min counterclockwise rotation time is 5 min, the 650 r / min counterclockwise rotation time is 5 min, the 350 r / min counterclockwise rotation time is 3 min, the 50 r / min counterclockwise rotation time is 5 min, and the 50 r / min counterclockwise rotation time is 5 min. As shown in Table 1:

[0091] Table 1 Mixing condition

[0092]

[0093] Step seven, discharging, after the mixing process is completed, the discharge valve 23 is used for discharging;

[0094] Specifically, after the mixing process is completed, the system will alarm and prompt to start the discharging process.

[0095] First, open the valve ES10 to pulse purge the filter, the system automatically purges once every 20 s, and the valve ES10 is closed after 2 min. Open the butterfly valve D5 and check the opening of the butterfly valve D6 to prepare for discharging.

[0096] Click the start discharging button to automatically execute the preset action: open the D4 pneumatic ball valve, and start the stirring paddle at a speed of 50 r / min. The powder in the cavity starts to be injected into the storage tank 11, and the powder flow can be observed at the discharge transparent flexible connection. If there is no powder flow at the flexible connection for a long time, use a rubber hammer to knock the discharge cylinder and the conical surface of the storage tank 11, and open the acoustic soot blower to purge once every 20 s for 2 min. Turn on and off the butterfly valve of the storage tank 11 several times to shake off the powder on the butterfly valve baffle.

[0097] If you want to stop discharging, you can press the pause discharging button, and the next time you press the start discharging button again to continue discharging.

[0098] If the discharging in the cavity is completed, the end discharging button can be pressed, and the discharging operation cannot be continued again, but only in the manual mode to open the discharge valve to discharge.

[0099] Finally, close butterfly valve D5, D6, end of discharge.

[0100] If the next discharge continues to replace the storage tank 11, remove the storage tank 11 connecting clamp, and seal the storage tank 11 with a blind plate. Replace the next storage tank 11 and connect it to the discharge port, lock the clamp. Each connected storage tank 11 must be oxygen-free and the empty tank pressure is 10-15KPa. Through the touch screen button to discharge port oxygen replacement, oxygen content after reaching the standard, open butterfly valve D6, open valve ES11 to communicate with the oxygen analyzer to exhaust, so that the storage tank 11 pressure is between 2-3KPa, after the pressure reduction is closed valve ES11.

[0101] Step eight, open cover cleaning, when replacing internal parts or equipment maintenance, need to passivate the powder in the storage tank 11 and open the top cover 12, unnecessary without opening the top cover 12,

[0102] Specifically, the storage tank 11 passivation: the length of passivation time, according to the amount of material in the storage tank 11, the more material, the longer the passivation time. The following storage tank 11 powder 1kg as an example: close valve ES7, S9, ES9, close butterfly valve D7, disassemble the connection between butterfly valve D7 and exhaust pipe, cover the outlet of butterfly valve D7 with a stainless steel blind plate. Slowly open the butterfly valve to a small angle, wait for half an hour; open the butterfly valve D7 to the maximum angle, do not move the blind plate, wait for 6 hours; move the blind plate away 1 / 4, wait for 6 hours; move the blind plate away 1 / 2, wait for 6 hours; completely remove the blind plate and wait for 6 hours; during passivation, pay attention to temperature, once the temperature rises rapidly, close the butterfly valve D7 immediately.

[0103] After the passivation of the storage tank 11 is completed, close the butterfly valve D7, disassemble the connection between the discharge cylinder below and the butterfly valve D5, and place the waste bucket below the discharge port. Loosen all the bolts connecting the storage tank 11 and the top cover 12, and slowly raise the cover through the touch screen control. After the cover is raised to a height of 10 cm, observe the powder accumulation in the storage tank 11, whether there is any abnormality such as redness. If there is any abnormality, immediately lower the cover; if there is no abnormality, maintain this state for 1 hour, and then continue to raise the cover to an appropriate height. Open the pneumatic valve D4, and then use a long-handled brush and a nitrogen gun to clean the accumulated powder into the waste bucket.

[0104] After the storage tank 11 is opened, the next time it needs to be run through the oxygen removal process. Because there is fresh ultra-fine powder in the exhaust filter, automatic oxygen removal must pass through the filter, and ultra-fine powder is easy to self-ignite, causing damage to the filter bag. Therefore, while passivating the storage tank 11, the ultra-fine powder in the exhaust filter also needs to be passivated. Because the exhaust filter often performs pulse backflushing, the filter bag has little powder sticking to it, and the passivation time is relatively short, but the filter bag has fine powder particles, and the oxidation reaction is rapid, so the passivation process is not easy to control, so the automatic program mode is used for passivation.

[0105] Exhaust filter fine powder passivation: before passivation, confirm that valves ES7, S9, ES9 are closed, valve S8 is opened, three-way electromagnetic valve ES8 is in the closed state, and the channel connecting the oxygen meter and the exhaust filter is opened. After confirming, set the automatic passivation parameters (time of each stage, cycle number), and open the automatic passivation exhaust filter button. As shown in Table 2:

[0106] Table 2 Automatic passivation parameters

[0107]

[0108] The total time of the automatic passivation process is 1075 minutes, of which 275 minutes is in the open state of the filter, and 800 minutes is in the closed state of the filter.

[0109] Step nine, if it is necessary to stop due to some subjective circumstances, the bin needs to be emptied.

[0110] Specifically, if it is necessary to stop due to some subjective circumstances, the bin 201 needs to be emptied, butterfly valves D2 and D5 are closed, valves ES9, S9, S3, S7, S4, S2, S6, and S1 are closed, the circulating water pump power is turned off, and the system total power is turned off.

[0111] In addition, in specific applications, the present application also includes a neodymium iron boron powder modification process, which comprises:

[0112] 1. Neodymium iron boron modified material, the maximum processing capacity of each batch of neodymium iron boron alloy powder is M, M=Vρ / 2, V is the cavity volume of the modification equipment, and p is the loose bulk density of the neodymium iron boron alloy powder. The minimum processing capacity of each batch of neodymium iron boron alloy powder is M / 3. Too much or too little processing capacity will cause insufficient flow of materials in the cavity and poor modification effect; the modified material can be a single specification of neodymium iron boron alloy powder, or two or more specifications of neodymium iron boron alloy powder.

[0113] 2. Liquid modifier, the addition ratio of liquid modifier for each batch of neodymium iron boron alloy powder is 0.5‰ (mass ratio), the addition rate of liquid modifier is 2-5 mL / min, and the addition method is: uniform speed drop of liquid.

[0114] 3. Solid modifier, the addition ratio of solid modifier for each batch of neodymium iron boron alloy powder is related to the specific additive, but the particle size D50 of the solid additive should be less than 1-2 microns, and the nano-level powder is the best choice.

[0115] The addition method is: added at the middle position of the neodymium iron boron alloy powder material to prevent the additive from adhering to other cavity walls and affecting the addition effect.

[0116] 4. Modification temperature, under the action of high shear force generated by high-speed rotating blade, the mutual friction and collision between alloy powder particles will generate heat, many volatile organic liquid modifiers are very sensitive to temperature and easy to evaporate. Therefore, the temperature is controlled at about 15-25°C during the modification process.

[0117] 5. Inert atmosphere closed protection environment, NdFeB powder is extremely sensitive to water / oxygen, generally the remanence of NdFeB magnet with higher oxygen content is lower; during the powder modification process, it needs to be carried out in an inert atmosphere (4N nitrogen / 4N argon) environment protection, in order to prevent outside air from entering and the gas in the cavity from leaking, so the internal working area of the powder modification equipment is a closed chamber, and the gas in the cavity is under positive pressure. In order to avoid the gas leakage caused by the high pressure of high-speed rotating airflow during the modification process, the gas pressure in the modification chamber is 3-10KPa micro-positive pressure.

[0118] 6. Modification process conditions, the speed below 300r / min can only play a mixing role, and has no effect on the appearance modification and powder modification of the powder particles. When the speed is maintained at 600r / min-700r / min, the particle sphericity can be effectively improved, nano-coating can be carried out, and the powder characteristics can be improved.

[0119] Under high speed, liquid dripping is easy to splash, and under static state, liquid addition is easy to cause powder agglomeration and adhesion to the cavity wall. Under the speed of counterclockwise 200r / min, liquid can be uniformly distributed without splashing liquid, and the powder does not stick to the cavity wall; the liquid modifier should be added in batches, about every 5min as a batch, and the speed needs to be increased for solid-liquid mixing for 5min after adding each batch of modifier; in this way, powder agglomeration can be effectively avoided, and then the wet material adhered to the inner wall of the equipment can be avoided, which causes a large amount of accumulated powder, makes it difficult to discharge, and reduces the process of cleaning the cavity; the total time of adding liquid modifier is determined according to the amount and adding speed of liquid modifier.

[0120] Necessary conditions for modification of NdFeB powder: cross processing of material at counterclockwise 650r / min for 5min and counterclockwise 350r / min for 3-5min, the best processing time is 30-40min, and the speed is crossed 3-4 times during this period. In this way, the powder appearance can be effectively modified, and the powder can be prevented from reaching motion balance under long-time high-speed rotation, causing poor modification effect and easy splashing of the powder to the dead angle of the blade treatment, causing difficulty in discharging.

[0121] After the modification treatment is completed, the powder suspended in the cavity is allowed to settle down for 2-3min, and then the material is discharged at clockwise 50r / min, so that the material is discharged more completely by the rotation of the blade and the self-weight of the powder.

[0122] Specifically, the following is an example of 40 kg single specification Nd-Fe-B powder adding 20 mL liquid additive, the liquid adding speed is 2 mL / min, the liquid adding time is 10 min at 200 r / min counterclockwise rotation, the interspersing time is 5 min at 300 r / min counterclockwise rotation twice, the continuous time is 5 min at 650 r / min counterclockwise rotation and 3 min at 350 r / min counterclockwise rotation cross 4 times, the discharging time is 5 min at 50 r / min counterclockwise rotation after 3 min of stagnation, and the total processing time is 60 min; in order to fully and uniformly process the powder, the whole process is divided into three stages as follows. As shown in Table 3:

[0123] Table 3 Reaction conditions of 40 kg single specification Nd-Fe-B powder adding 20 mL liquid additive

[0124]

[0125] Specifically, the modification effect is shown in Table 4 and Table 5:

[0126] Table 4 Modification results of single specification Nd-Fe-B powder modification

[0127]

[0128] Table 5 Modification results of single specification Nd-Fe-B powder modification

[0129]

[0130] Specifically, by modifying the neodymium iron boron powder, a foundation is laid for the one-step near-net forming process of the neodymium iron boron magnet. The process is that a high shear mechanical force is applied to the surface of the neodymium iron boron powder particles to promote the spheroidization of the particles and the uniform coating of the particles by the nano ultra-fine powder. A trace amount of organic additive is added for uniform mixing to play the role of oxidation resistance, flowability enhancement, and adhesion of the ultra-fine powder. A small amount of nano alloy powder is added for uniform mixing to improve the sintering temperature and magnetic properties of the magnet. In the existing neodymium iron boron industry, a three-dimensional tumbling mixer is used for simple material mixing, and the modification and modification of the powder particles are not realized. Moreover, the mixing effect is not good, especially when mixing two alloy powders, the two alloy powders cannot be fully mixed together. In the production process of neodymium iron boron materials, many enterprises often use double alloy mixing to improve the performance of the magnet, that is, two different grades and particle size distribution of neodymium iron boron alloy powder are mixed and processed into a magnet. For this, enterprises use three-dimensional mixing equipment to process double alloy materials, but the performance improvement is not high and the consistency of the magnet is unstable. The modification and modification of the neodymium iron boron powder are more obvious for processing double alloy powder. The high shear mechanical force can make the two alloy powders mutually coated and fully fused, and the powder consistency is good. The three-dimensional tumbling mixing process takes 4-6 hours to process the powder, and the liquid additive ratio is 2 ‰ to 2.5 ‰. The modification and modification process of the neodymium iron boron powder only takes 30-35 minutes to process each batch of powder, and the liquid additive ratio is about 0.5 ‰. The processing efficiency is higher, the amount of additive is less, and the modification effect is better.

[0131] In order to facilitate the understanding of the above technical solutions of the present application, the working principle or operation mode of the present application in actual process will be described in detail.

[0132] In actual application, first, the material is added to the inside of the storage tank 11 through the feeding port 16, and the material in the inside of the storage tank 11 is mixed and stirred by the mixing mechanism 13. After mixing and stirring, the material is discharged through the discharge valve 23. The top cover 12 can be raised by the lifting mechanism 9 to clean the inside of the storage tank 11. The temperature inside the storage tank 11 can be adjusted through the cooling water inlet 20.

[0133] In summary, by means of the above technical scheme of the present application, the present application can realize the functions of continuous production, quantitative feeding, quantitative liquid adding, nano-powder adding, automatic displacement oxygen discharging, nitrogen constant pressure protection, oxygen content monitoring, automatic stage mixing, cover opening-free cleaning of the storage tank, temperature monitoring, video monitoring, top cover lifting, etc., has high automation degree, visualized parameters, high process optimization freedom, can realize modification of neodymium iron boron powder particles, can handle solid-liquid mixing, solid-solid mixing, especially solid-solid mixing process, can uniformly mix a small amount of nano-powder additive with neodymium iron boron alloy powder, which cannot be realized by ordinary three-dimensional mixers; the present application can also modify the powder of recycled neodymium iron boron waste material, and the powder flowability and squareness of the modified powder are close to those of newly prepared neodymium iron boron powder, which is very important in the production process of neodymium iron boron magnets; by arranging the mixing mechanism 13, the mixing and stirring of the materials in the storage tank 11 are realized, so that the mixing of the materials is more sufficient, and the inner wall of the storage tank 11 can be cleaned by the scraper rod 1305, so that the adhesion of materials on the inner wall of the storage tank 11 after long-term use is avoided, the workload of the workers is reduced, and in addition, the scraper rod 1305 can be adjusted by the adjusting shaft 1307 after wear, so that the cleaning of the inside of the storage tank 11 is always maintained, thereby reducing the maintenance cost; by arranging the video monitoring device 17, the mixing condition of the materials in the storage tank 11 is monitored, so that the mixing state of the materials in the storage tank 11 can be more clearly understood, and by arranging the dust scraper 1708, the dust on the surface of the lens 1706 can be cleaned, so that the lens 1706 is not monitored due to too much dust on the surface of the lens 1706, and in addition, the plastic film can prevent dust from being adsorbed in the gap and hinder the rotation of the connecting rod; by arranging the acoustic soot blower 19, the acoustic generator 1903 can be driven by compressed nitrogen, the sound amplifier 1901 is amplified, the acoustic energy is transmitted to the powder accumulation area, the soot particles are reciprocally vibrated by the acoustic energy to separate from the surface of the equipment, and the purpose of removing the powder is achieved.

[0134] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screwing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited, the above-mentioned terms in the present application can be understood according to the specific meaning of the above-mentioned terms in the present application by the person skilled in the art. The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A Nd-Fe-B mixture system, comprising a gas supply system (1), a feeding system (2), an exhaust system (3), a cooling system (4), a device body (5), a processing system (6) and a liquid adding system (7), the gas supply system (1), the feeding system (2), the exhaust system (3), the cooling system (4), the processing system (6) and the liquid adding system (7) are sequentially connected with the device body (5), characterized in that, The device body (5) comprises a bottom plate (8); The top end of the bottom plate (8) is provided with a lifting mechanism (9), the top end of the lifting mechanism (9) is provided with a cross beam, one end of the bottom of the cross beam is provided with a driving motor (10), one side of the bottom plate (8) is provided with a storage tank (11), the top end of the storage tank (11) is provided with a top cover (12), and the top end of the top cover (12) is fixedly connected with the bottom of the other end of the cross beam; The bottom of one end of the cross beam is provided with a mixing mechanism (13) penetrating through the top cover (12) and located inside the storage tank (11); The top end of the outside of the top cover (12) is sequentially provided with an air inlet (14) connected with the air supply system (1), an exhaust port (15) connected with the exhaust system (3), a feed inlet (16) connected with the feed system (2), a video monitoring device (17), a liquid adding port (18), and a sonic soot blower (19); The bottom of the outside of the storage tank (11) is provided with a cooling water inlet (20) connected with the cooling system (4), the top of the outside of the storage tank (11) is provided with a cooling water outlet (21), the middle of the outside of the storage tank (11) is provided with a temperature sensor (22), and the bottom end of the storage tank (11) is provided with a discharge valve (23); The mixing mechanism (13) comprises a driving shaft (1301) arranged at the bottom of one end of the cross beam, a belt pulley one is arranged at the top end of the driving shaft (1301) and located inside the cross beam, a spiral plate (1302) is arranged at the bottom of the outside of the driving shaft (1301), a baffle (1303) is arranged at the outside of the spiral plate (1302), a cross rod (1304) is symmetrically arranged at the middle of the outside of the driving shaft (1301), a scraping rod (1305) is embedded at one end of the cross rod (1304), a cavity (1306) is arranged at the inside of the driving shaft (1301) and located at one end of the scraping rod (1305), and an adjusting mechanism is arranged at the inside of the cavity (1306); The adjusting mechanism comprises an adjusting shaft (1307) penetratingly arranged at the inside of the cavity (1306), and a bevel gear one (1308) is sleeved at the bottom of the circumferential side wall of the adjusting shaft (1307); A threaded rod (1309) is penetratingly arranged at one side of the cavity (1306), and a bevel gear two (1310) meshing with the bevel gear one (1308) is sleeved at one end of the threaded rod (1309); The liquid adding system (7) comprises a base (701), clamps (702) are arranged at the top of one side of the base (701), a syringe (703) is arranged between the clamps (702), the clamps (702) are provided with cover plates (704), and a display screen (705) is arranged at one side of the clamps (702). The bottom of the clamp (702) is provided with a servo motor (706), the bottom end of the servo motor (706) is provided with a transmission screw rod (707), one side of the servo motor (706) is provided with a button (708); the top end of the syringe (703) is provided with a three-way valve (709), one end of the three-way valve (709) is provided with a liquid suction tube (710), one end of the liquid suction tube (710) is provided with a liquid storage tank (711), the other end of the three-way valve (709) is provided with a liquid infusion tube (712) connected with the liquid inlet (18), one end of the liquid infusion tube (712) and located inside the liquid inlet (18) is provided with a needle tube (713). The feeding system (2) comprises a stock bin (201), the bottom end of the stock bin (201) is connected with the feeding port (16), and the top end of the stock bin (201) is provided with a glove box (202). The top end of the glove box (202) is sequentially provided with a nitrogen inlet (203), a pressure gauge (204), an oxygen content monitor (205) and an air outlet (206) from left to right, one end of the glove box (202) is provided with an inlet gate (207), one side of the glove box (202) is provided with a glove port (208), and the bottom end of the glove box (202) is provided with a feeding valve (209). The video monitoring device (17) comprises a connecting rod (1701) penetrating through the top end of the top cover (12), and the connecting rod (1701) and the top cover (12) are connected through a connecting flange one (1702), one end of the connecting rod (1701) is provided with a junction box (1703), the other end of the connecting rod (1701) is provided with a camera (1704), one side of the camera (1704) is provided with an illumination light source (1705), the bottom end of the camera (1704) is provided with a lens (1706), the inside of one side of the lens (1706) is provided with a cleaning motor (1707), one end of the output shaft of the cleaning motor (1707) is provided with a dust scraper (1708), and the connecting rod (1701) and the camera (1704) are externally sleeved with a plastic film. The acoustic blowing device (19) is provided with a sound amplifier (1901) penetrating through the top cover (12), and the sound amplifier (1901) and the top cover (12) are connected through a connecting flange two (1902), the top end of the sound amplifier (1901) is provided with a sound wave generator (1903), and one side of the sound wave generator (1903) is provided with a nitrogen inlet.

2. The NdFeB mixing system of claim 1, wherein, The cross section of the scraping rod (1305) is provided in a V-shaped structure, and a threaded hole matched with the threaded rod (1309) is formed in the side wall of one end of the scraping rod (1305).

3. The NdFeB mixing system of claim 2, wherein, The output shaft of the driving motor (10) and located inside one end of the cross beam is sleeved with a belt pulley one, the top end of the driving shaft (1301) and located inside the other end of the cross beam is sleeved with a belt pulley two, and the belt pulley one and the belt pulley two are connected through a belt.

4. A NdFeB mix process for performing the mixing operation of the NdFeB mixing system according to any one of claims 1 to 3, characterized in that, The process comprises the following steps: Step one, preliminary preparation, check and confirm whether the gas source pressure and gas volume of nitrogen and compressed air are sufficient; Step two, oxygen content confirmation, ensure that the oxygen content in the mixing system is less than 20ppm before feeding; Step three, quantitative feeding, add the pre-set material to the inside of the equipment body (5) through the feeding system (2); Step four, quantitative liquid addition, add the pre-configured solution to the inside of the equipment body (5) through the liquid addition system (7); Step five, add solid additives, add solid additives to the inside of the bin (201) through the glove box (202); Step six, material mixing, mix the materials through the equipment body (5); Step seven, discharging, after the mixing process is completed, discharge through the discharge valve (23); Step eight, open the cover and clean up, when replacing internal parts or equipment maintenance and repair, the powder in the passivation storage tank (11) needs to be passivated before the top cover (12) is opened; Step nine, if it needs to be stopped, the bin needs to be emptied.

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