Neodymium iron boron powder stirring charging barrel

Abstract

The invention relates to the technical field of neodymium iron boron powder stirring charging barrels, and discloses a neodymium iron boron powder stirring charging barrel which is characterized in that a barrel cover is assembled at the top of the charging barrel, an upper spraying assembly is assembled at the center of the barrel cover, and a lower spraying assembly is assembled at the center of the bottom in the charging barrel; air flow distribution in the charging barrel is optimized through cooperation of the upper spraying assembly and the lower spraying assembly, so that uniform mixing of powder is achieved, a closed circulating flow field is formed through the synergistic effect of spraying air flow of the upper spraying assembly and the lower spraying assembly, the powder mixing effect is further improved, the magnetic suspension mixing assembly is arranged in the charging barrel, and the mixing efficiency is improved. Blade-air flow double shearing is formed, large particles are forcibly raised, and the defect that the large particles sink to the bottom in the powder mixing process and consequently mixing is uneven can be effectively overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of neodymium iron boron powder stirring barrels, and particularly relates to a neodymium iron boron powder stirring barrel. BACKGROUND

[0002] Neodymium iron boron powder is widely concerned due to its wide application, but its flammable characteristics bring significant safety challenges. Before the forming production of neodymium iron boron magnets, a stirring device is usually used to stir the powder needed in production. At present, the mixing methods of neodymium iron boron powder mainly include manual addition of additives and traditional mechanical stirring method.

[0003] However, these methods have many limitations in practical application. For example, manual addition of additives is easy to cause local agglomeration of powder, and it is difficult to achieve uniform dispersion effect. The traditional mechanical stirring method is limited by the structure and movement mode of the stirrer, so that the stirring blades of the traditional stirrer can only contact the powder in a range when rotating, which causes the stirring roller of the stirring device to only be able to improve the local stirring intensity and cannot fully cover all corners in the barrel. Especially when dealing with fine particle powder, dead angles or areas not fully mixed are easy to appear. These problems not only affect the mixing efficiency, but also may cause unstable performance of the final product. Therefore, a more advanced multi-angle mixing solution is urgently needed.

[0004] Therefore, the present application provides a neodymium iron boron powder stirring barrel to solve the above problems. SUMMARY

[0005] The present application aims to provide a neodymium iron boron powder stirring barrel to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a neodymium iron boron powder stirring barrel, comprising a barrel, a barrel cover is arranged at the top of the barrel, an upper jet assembly is arranged at the center of the barrel cover, a lower jet assembly is arranged at the center of the bottom of the barrel in the barrel; The upper jet assembly comprises a driver fixed at the center of the barrel cover, a rotating disc is fixedly arranged at the output end of the driver and penetrates through the barrel cover, twelve groups of universal ball head jet valves are uniformly arranged at the bottom outer edge of the rotating disc in the circumferential direction, a first gas supply pipe is arranged at the center of the rotating disc, the first gas supply pipe and the twelve groups of universal ball head jet valves are communicated through a gas conveying pipe, each group of universal ball head jet valves further comprises a stepping motor fixed at the bottom of the rotating disc, and the output end of the stepping motor is fixedly connected with the universal ball head jet valve; The lower injection assembly comprises a protective cylinder fixed at the center of the bottom of the barrel, a disc type air floating bottom plate is arranged above the protective cylinder, a permanent magnet ring is fixed at the bottom of the disc type air floating bottom plate, the protective cylinder and the permanent magnet ring form a magnetic suspension structure, the outer edge of the top of the disc type air floating bottom plate is uniformly distributed with Venturi nozzles outward and at an inclination angle of 45 degrees along the circumferential direction, and the Venturi nozzles are communicated with the second gas supply pipe.

[0007] Preferably, the driver comprises a protective shell fixed at the top of the barrel cover and a rotating barrel rotatably assembled at the center of the barrel cover through a bearing, the bottom end of the rotating barrel is fixed at the top center of the rotating disc, the top end of the rotating barrel extends into the protective shell and is fixedly installed with a pinion, the outer side of the pinion is engaged and assembled with a main gear, and the top of the protective shell is provided with a servo motor fixedly connected with the main gear.

[0008] Preferably, the top of the rotating disc is integrally formed with a material blocking ring, the top of the material blocking ring is attached to the top of the inner side of the barrel cover, the barrel cover is provided with an inlet, and a gap of 3mm is reserved between the outer edge of the rotating disc and the inner side wall of the barrel cover.

[0009] Preferably, the top end of the first gas supply pipe extends out of the protective shell through the rotating barrel and the pinion, and a channel accommodating the gas conveying pipe is formed in the rotating disc.

[0010] Preferably, three groups of radial electromagnets are fixed in the protective cylinder and uniformly distributed at an angle of 120 degrees, the permanent magnet ring is matched with the three groups of radial electromagnets, the protective cylinder is defined as a "stator", and the permanent magnet ring is defined as a "rotor".

[0011] Preferably, a butterfly valve is arranged in the protective cylinder, six groups of fan-shaped air chambers are uniformly distributed in the disc type air floating bottom plate, the Venturi nozzles are communicated with the fan-shaped air chambers, the second gas supply pipe is communicated with the fan-shaped air chambers through the butterfly valve and the gas guide pipes, the number of gas guide pipes is the same as that of the fan-shaped air chambers, and a proportional valve is fixedly assembled on each group of gas guide pipes.

[0012] Preferably, a heat conducting ring is fixed on the outer side wall of the barrel, a phase change heat absorbing ring corresponding to the heat conducting ring is fixed on the inner side wall of the barrel, and the phase change heat absorbing ring is filled with paraffin-graphene.

[0013] Preferably, pressure sensors and material level sensors are fixed on the inner side wall of the barrel at upper, middle and lower positions, respectively.

[0014] Technical effects and advantages of the present application: The present application optimizes the internal airflow distribution of the barrel through the cooperation of the upper injection assembly and the lower injection assembly, so as to realize the uniform mixing of the powder, and the closed circulation flow field is formed through the synergistic effect of the injection airflow of the upper injection assembly and the lower injection assembly, so as to further improve the mixing effect of the powder, and the large particles are forced to rise, so that the defect that the large particles sink to the bottom during the mixing process and cause uneven mixing of the powder can be effectively overcome. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the overall structure of the present application; Figure 3 It is a schematic diagram of the overall structure of the present application; Figure 4 It is a schematic diagram of the overall structure of the present application; Figure 5 It is a schematic diagram of the overall structure of the present application; In the figure: 1, barrel; 2, barrel cover; 3, protective shell; 4, servo motor; 5, rotating barrel; 6, auxiliary gear; 7, main gear; 8, rotating disc; 9, material blocking ring; 10, universal ball head injection valve; 11, first gas supply pipe; 12, feed inlet; 13, heat conducting ring; 14, phase change heat absorption ring; 19, protective barrel; 20, disc type air floating bottom plate; 21, permanent magnet ring; 22, butterfly valve; 23, venturi nozzle; 24, second gas supply pipe. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] As Figures 1 to 5 shown, the present embodiment discloses a neodymium iron boron powder stirring barrel, which comprises a barrel 1, the top of the barrel 1 is equipped with a barrel cover 2, the center of the barrel cover 2 is equipped with an upper injection assembly, the center of the bottom of the barrel 1 is equipped with a lower injection assembly, the internal airflow distribution of the barrel 1 is optimized through the cooperation of the upper injection assembly and the lower injection assembly, so as to realize the uniform mixing of the powder, and the closed circulation flow field is formed through the synergistic effect of the injection airflow of the upper injection assembly and the lower injection assembly, so as to further improve the mixing effect of the powder, and the large particles are forced to rise, so that the defect that the large particles sink to the bottom during the mixing process and cause uneven mixing of the powder can be effectively overcome.

[0018] Please refer toFigures 1-5 The upper injection assembly comprises a driver fixed at the center of the barrel cover 2, the output end of the driver is fixedly fitted with a rotating disc 8 through the barrel cover 2, the bottom outer edge of the rotating disc 8 is uniformly fitted with twelve groups of universal ball head injection valves 10 in the circumferential direction, and the center of the rotating disc 8 is fitted with a first gas supply pipe 11, the first gas supply pipe 11 and the twelve groups of universal ball head injection valves 10 are communicated through a gas conveying pipe, and each group of universal ball head injection valves 10 further comprises a stepping motor fixed to the bottom of the rotating disc 8, and the output end of the stepping motor is fixedly connected with the universal ball head injection valve 10.

[0019] Please refer to Figures 2-5 The driver comprises a protective shell 3 fixed at the top of the barrel cover 2 and a rotating barrel 5 rotatably fitted at the center of the barrel cover 2 through a bearing, the bottom end of the rotating barrel 5 is fixed at the top center of the rotating disc 8, the top end of the rotating barrel 5 extends into the protective shell 3 and is fixedly installed with a sub gear 6, the outer side of the sub gear 6 is meshingly fitted with a main gear 7, and the top of the protective shell 3 is provided with a servo motor 4 fixedly connected with the main gear 7.

[0020] Please refer to Figure 5 The top of the rotating disc 8 is integrally provided with a material blocking ring 9, the top of the material blocking ring 9 is attached to the top of the inner side of the barrel cover 2, the barrel cover 2 is provided with an inlet 12, and a gap of 3mm is reserved between the outer edge of the rotating disc 8 and the inner side wall of the barrel cover 2.

[0021] Please refer to Figure 5 The top end of the first gas supply pipe 11 extends out of the protective shell 3 through the rotating barrel 5 and the sub gear 6, and a channel accommodating the gas conveying pipe is formed in the rotating disc 8.

[0022] In actual use, the main gear 7 and the sub gear 6 are combined into a planetary gear, under the driving of the servo motor 4, the rotating disc 8 at the bottom end of the rotating barrel 5 is synchronously driven to rotate, thereby driving the twelve groups of universal ball head injection valves 10 to synchronously rotate, blowing the powder in the barrel 1, and when the powder is introduced into the barrel 1 from the inlet 12, the powder will be thrown away along the top of the rotating disc 8 based on the rotating centrifugal force of the rotating disc 8 to the edge of the rotating disc 8, and then fall into the barrel 1 through the gap between the rotating disc 8 and the inner side wall of the barrel cover 2, and then under the blowing action of the universal ball head injection valve 10, the powder is impacted by the jet flow, avoiding the formation of a transient negative pressure zone at the inlet 12, breaking the top arch, and when the inclination angle α of the universal ball head injection valve 10 is changed, the jet flow can form a spiral flow in the barrel 1, avoiding the one-time settlement of the powder.

[0023] It is worth mentioning that when the stepper motor works, it can drive the universal ball head jet valve 10 to adjust the angle, and then complete the adjustment of the jet angle a, realize 0°-45° continuous stepless adjustment, and when the material level in the barrel 1 is less than 20%, a=0°, at this time the jet is in the vertical downward state, and the arch breaking operation is completed, when the material level is greater than 80%, a=45°, at this time the jet is inclined to the inner wall of the barrel 1, forming a spiral flow, through this technical way, the bridge arch is destroyed immediately, the jet angle is optimized in real time with the material level, and the smoothness of the discharge is improved. Moreover, the first gas supply pipe 11 penetrates through the universal ball head jet valve 10 on the rotating cylinder 5 and the rotating disc 8, and the rotating disc 8 can realize 0-360° rotation, and the gas supply is uninterrupted.

[0024] Please refer to Figures 2-5 , the lower jet assembly includes a protection cylinder 19 fixed at the center of the bottom of the barrel 1, a disc type air floating bottom plate 20 is arranged above the protection cylinder 19, a permanent magnet ring 21 is fixed at the bottom of the disc type air floating bottom plate 20, and the protection cylinder 19 and the permanent magnet ring 21 form a magnetic suspension structure, so that the disc type air floating bottom plate 20 is suspended by 2 mm through the magnetic suspension bearing, can realize 0-120 rpm low-speed rotation, and the outer edge of the top of the disc type air floating bottom plate 20 is uniformly distributed in the circumferential direction. The Venturi nozzle 23 is outward and inclined at an angle of 45°, each Venturi nozzle 23 adopts a long Venturi structure, the angle between the axis and the normal line of the disc type air floating bottom plate 20 is 45° and outwardly inclined, forming a 45° conical jet downward and outward, and the 45° angle can generate a negative pressure area in the 2 mm air gap below the disc type air floating bottom plate 20 and push the powder to the cylinder wall to form a “powder suction and upward” circulation.

[0025] Moreover, the Venturi nozzle 23 is communicated with the second gas supply pipe 24, three groups of radial electromagnets are fixed in the protection cylinder 19 and uniformly distributed at an angle of 120°, the permanent magnet ring 21 is matched with the three groups of radial electromagnets, the protection cylinder 19 is defined as a “stator”, and the permanent magnet ring 21 is defined as a “rotor”, a static bias magnetic field is formed through the permanent magnet ring 21 to provide a basic suspension force, the three groups of radial electromagnets real-time fine-tune the 2 mm air gap, and are supplemented by a micro air gap air floating backup, so that the disc type air floating bottom plate 20 can realize non-contact, low power consumption and 2 mm stable suspension.

[0026] The butterfly valve 22 is arranged in the protection cylinder 19, six groups of fan-shaped air chambers are uniformly distributed in the disc type air floating bottom plate 20, the Venturi nozzle 23 is communicated with the fan-shaped air chamber, the second gas supply pipe 24 penetrates through the butterfly valve 22 and is communicated with the fan-shaped air chamber through the air guide pipe, the number of air guide pipes is the same as that of the fan-shaped air chambers, and a proportional valve is fixedly arranged on each group of air guide pipes.

[0027] The disc type air floating bottom plate 20 rotates, which can drive the Venturi nozzle 23 to sweep the entire bottom surface, realizing uniform powder suction and upward movement. Moreover, the proportional valve can be adjusted in real time based on the material height in the barrel 1, so as to adjust the jet flow of the Venturi nozzle 23. High-pressure air enters the Venturi nozzle 23 through the proportional valve, a high-speed jet is generated at the throat of the nozzle, the static pressure drops sharply, a local negative pressure is formed, the powder at the bottom of the barrel 1 is sucked into the jet by the negative pressure, and a “powder suction column” is formed upward along the airflow. The disc type air floating bottom plate 20 rotates at a low speed, so that the several Venturi nozzles 23 sweep the entire bottom surface in turn, and the powder is uniformly sucked in the internal space of the barrel 1. The high-speed jet at the barrel cover 2 forms a downward momentum, which is combined with the powder suction column at the bottom to form a closed spiral circulation. Under the jetting action of the universal ball head jet valve 10, the up and down airflow ratio can be adjusted, so that the up and down airflow forms a closed spiral, the powder circulation speed is improved, the upper jet assembly and the lower jet assembly are independently designed and real-time cooperative closed loop, the mixing time is shortened, the energy consumption is reduced, and the dead angle mixing can also be realized.

[0028] When the powder is stirred, the entire stirring and mixing process is divided into five stages: feeding stage, initial mixing stage, main mixing stage, fine mixing stage and steady state stage, which are specifically as follows: When the mixing is in the feeding stage, the inclination angle α of the universal ball head jet valve 10 is 0°, the jet is vertically downward, and the universal ball head jet valve 10 alternately operates in the pulse mode of 0.5 s on and 0.5 s off at an air pressure of 0.6 MPa. At the same time, the disc type air floating bottom plate 20 is stationary, and the six groups of proportional valves maintain an opening degree of 20%, so that the top “arch-breaking jet” first disperses the arch, and the bottom micro-air flow supports the bottom to prevent primary settlement, so as to ensure that the feeding has no arching and the feeding port has no powder spraying.

[0029] When the mixing is in the initial mixing stage, the inclination angle α of the universal ball head jet valve 10 increases from 0° to 30°, and the rotating disc 8 rotates at 30 rpm, the jet is directed to the inner wall of the barrel 1. At the same time, the disc type air floating bottom plate 20 rotates at 20 rpm, and the six groups of proportional valves maintain an opening degree of 40%, so that the top inclined jet and the bottom rotating powder suction column form a primary spiral flow, which can promote the powder to be lifted upward from the bottom, shear the powder layer, eliminate the density gradient, and make the concentration difference in the barrel less than 5%, thereby improving the preliminary mixing effect of the powder.

[0030] When the mixing is in the main mixing stage, the inclination angle α of the universal ball head jet valve 10 remains 30°, the rotating disc 8 rotates at 60 rpm, the jet is directed to the inner wall of the barrel 1, and at the same time, the disc type air floating bottom plate 20 rotates at 60 rpm, and the six groups of proportional valves maintain an opening degree of 60%, and the negative pressure is controlled at-4 KPa. The Euler-Lagrange two-way coupling model is used to make the particles shuttle between the two airflows, realize macro-convection + micro-diffusion double mixing, so that the up and down airflows form a closed “8” shape circulation, the mixing uniformity CV is reduced from 15% to 3%, and there is no dead angle.

[0031] When mixing in the fine mixing stage, the inclination angle a of the universal ball head injection valve 10 is from 30° to 10°, the rotating disc 8 rotates at 30 rpm, at the same time, the disc type air floating bottom plate 20 rotates at 30 rpm, and the six groups of proportional valves maintain an opening of 30%, reducing the jet inclination angle and rotating speed, reducing the shear rate g, reducing the inter-particle collision energy, maintaining particle integrity, reducing shear, reducing powder crushing, and promoting the particle integrity rate to remain 98%, and the temperature rise is less than 2℃.

[0032] When mixing in the steady state stage, the inclination angle a of the universal ball head injection valve 10 is 0°, the jet is perpendicular downward, and the universal ball head injection valve 10 alternately operates in a pulse mode of 0.3s opening and 0.7s closing, at the same time, the disc type air floating bottom plate 20 stops rotating, and the six groups of proportional valves maintain an opening of 10%, the top intermittent pulse forms periodic disturbance, and the bottom micro-flow maintains particle suspension, preventing secondary sedimentation; using the vibration-suspension coupling principle, the suspension concentration gradient is maintained to be less than 1%, and then the top intermittent jet maintains suspension, and the bottom only maintains micro-flow, so as to prevent sedimentation and wait for unloading.

[0033] When unloading, the butterfly valve is opened, the butterfly valve plate is embedded with an electromagnetic lock, which is controlled by PLC, when the mixing is in the feeding stage and the mixing stage, the electromagnetic lock is attracted, and the valve plate is closed, when the unloading starts, the electromagnetic lock is powered off, the air cylinder is opened for 2s, and a double-layer PTFE sealing ring is arranged between the valve plate and the valve seat, that is, the inner ring is V-shaped and the outer ring is O-shaped, the pressure resistance is 0.6MPa, and the valve body is connected with a negative pressure dust collecting cover below, so that the residual dust is sucked away in an instant, and the on-site dust is ensured to be less than 1mg / m 3 When in use, through the "negative pressure curtain + electromagnetic lock" and the cover-bottom double valve linkage, the feeding, mixing and discharging are zero escaping and zero leakage throughout the process.

[0034] It is worth noting that a fixed gap of 2mm, that is, a magnetic suspension air gap, is reserved between the disc type air floating bottom plate 20 and the bottom of the barrel 1, so that the powder cannot leak from the discharge port, and the following three "zero leakage" designs are relied on: Firstly, the air gap becomes a "air cushion seal", there is always a compensation airflow of 0.4-0.6MPa in the 2mm magnetic suspension gap, the airflow speed is greater than 50m / s, a continuous air curtain is formed, the powder particles cannot flow back and pass through, and the 0.4-0.6MPa continuous air curtain in the 2mm magnetic suspension gap is not an additional airflow, but a "magnetic-air hybrid bearing" working medium that must be provided by the suspension system itself, so that the 0.4-0.6MPa compensation airflow not only maintains the 2mm magnetic suspension, but also naturally becomes a powder sealing air curtain without the need for an additional air blower; Secondly, a double-layer butterfly valve is arranged at the discharge port, the butterfly valve plate is a double-layer PTFE sealing ring with V-shaped and O-shaped, and the valve plate is pressed tightly by the air curtain pressure when the valve is closed, so that the sealing level is high. Third, PLC control, disc type air floating bottom plate 20 in the suspended state, the discharge port of the electromagnetic lock suction, that is, the valve plate is closed, only when the disc type air floating bottom plate 20 is lowered to 0.1mm standby air film or completely powered off, the electromagnetic lock is powered off, and the valve can be opened to unload.

[0035] Please refer to Figures 2-4 The outer side wall of the barrel 1 is fixed with a heat conducting ring 13, and the inner side wall of the barrel 1 is fixed with a phase change heat absorbing ring 14 corresponding to the heat conducting ring 13, and the phase change heat absorbing ring 14 is filled with paraffin-graphene. Before the powder material is introduced into the barrel 1, cold air is introduced in advance by using a pulse valve to make the paraffin-graphene phase change material solidify in advance, so that the powder temperature rise is less than 1℃ during the subsequent up-down mixing process of the material introduced into the barrel 1, the particle breakage rate is reduced, and the heat conducting ring 13 can quickly conduct the heat on the phase change heat absorbing ring 14 outward to improve the heat dissipation efficiency.

[0036] The pressure sensor and the material level sensor are fixed on the upper, middle and lower positions of the inner side wall of the barrel 1. The pressure sensor and the material level sensor on the upper layer detect the pressure and the material level height at the top of the barrel 1, so as to find the "arch bridge" or "powder spraying", and then the inclination angle α of the universal ball head injection valve 10 at the top is increased, and the feeding speed is reduced. The pressure sensor and the material level sensor in the middle detect the pressure and the density gradient in the middle section of the barrel 1, so as to find the "density stratification", and then the rotating speed of the disc type air floating bottom plate 20 is increased, and the opening of the proportional valve is increased. The pressure sensor and the material level sensor on the lower layer detect the pressure at the bottom of the barrel 1 and whether the material level collapses, so as to find the "dead angle" or "hollow", and then the rotating speed of the disc type air floating bottom plate 20 is increased. The three-layer pressure difference ΔP can be used to calculate the effective density of the powder in real time. The material level sensor gives the absolute material level to prevent overflow or empty bin. When the value of a certain layer sensor suddenly changes, the system immediately reduces the speed or stops to avoid particle breakage or equipment overload.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the scope of the present application should be included in the protection scope of the present application.

Claims

1. A neodymium-iron-boron powder stirring pot, comprising a pot (1), the top of which is equipped with a pot cover (2), characterized in that: The center of the barrel cover (2) is equipped with an upper injection assembly, and the center of the inner bottom of the barrel (1) is equipped with a lower injection assembly; The upper injection assembly comprises a driver fixed at the center of the barrel cover (2), the output end of the driver is fixedly equipped with a rotating disc (8) penetrating through the barrel cover (2), the bottom outer edge of the rotating disc (8) is uniformly equipped with twelve groups of universal ball head injection valves (10) in the circumferential direction, and the center of the rotating disc (8) is equipped with a first gas supply pipe (11), the first gas supply pipe (11) and the twelve groups of universal ball head injection valves (10) are communicated through a gas conveying pipe, and each group of universal ball head injection valves (10) further comprises a stepping motor fixed to the bottom of the rotating disc (8), and the output end of the stepping motor is fixedly connected with the universal ball head injection valve (10); The lower injection assembly comprises a protective barrel (19) fixed at the center of the bottom of the barrel (1), a disc type air floating bottom plate (20) is arranged above the protective barrel (19), a permanent magnet ring (21) is fixed to the bottom of the disc type air floating bottom plate (20), the protective barrel (19) and the permanent magnet ring (21) form a magnetic suspension structure, the top outer edge of the disc type air floating bottom plate (20) is uniformly distributed with Venturi nozzles (23) outward and at an inclination angle of 45° in the circumferential direction, and the Venturi nozzles (23) are communicated with a second gas supply pipe (24).

2. The NdFeB powder mixing cylinder according to claim 1, characterized in that: The driver comprises a protective shell (3) fixed at the top of the barrel cover (2) and a rotating barrel (5) rotatably equipped at the center of the barrel cover (2) through a bearing, the bottom end of the rotating barrel (5) is fixed at the top center of the rotating disc (8), the top end of the rotating barrel (5) extends into the protective shell (3) and is fixedly installed with a secondary gear (6), the outer side of the secondary gear (6) is engagedly equipped with a primary gear (7), and the top of the protective shell (3) is provided with a servo motor (4) fixedly connected with the primary gear (7).

3. The NdFeB powder stir pot of claim 2, wherein: The top of the rotating disc (8) is integrally provided with a material blocking ring (9), the top of the material blocking ring (9) is attached to the top inside of the barrel cover (2), a feeding port (12) is formed in the barrel cover (2), and a gap of 3mm is reserved between the outer edge of the rotating disc (8) and the inner side wall of the barrel cover (2).

4. The NdFeB powder mixing drum according to claim 3, characterized in that: The top end of the first gas supply pipe (11) extends out of the protective shell (3) through the rotating barrel (5) and the secondary gear (6), and a channel for accommodating the gas conveying pipe is formed in the rotating disc (8).

5. The NdFeB powder mixing barrel of claim 1, wherein: Three groups of radial electromagnets are fixed in the protective barrel (19) and are uniformly distributed at an angle of 120°, the permanent magnet ring (21) is matched with the three groups of radial electromagnets, the protective barrel (19) is defined as a "stator", and the permanent magnet ring (21) is defined as a "rotor".

6. The NdFeB powder mixing drum of claim 5, wherein: A butterfly valve (22) is arranged in the protective barrel (19), six groups of fan-shaped air chambers are uniformly distributed in the disc type air floating bottom plate (20), the Venturi nozzles (23) are communicated with the fan-shaped air chambers, the second gas supply pipe (24) is communicated with the fan-shaped air chambers through a gas guide pipe penetrating through the butterfly valve (22), the number of gas guide pipes is the same as that of the fan-shaped air chambers, and a proportional valve is fixedly equipped on each group of gas guide pipes.

7. The NdFeB powder mixing barrel of claim 1, wherein: The heat conduction ring (13) is fixed on the outer wall of the barrel (1), the phase change heat absorption ring (14) corresponding to the heat conduction ring (13) is fixed on the inner wall of the barrel (1), and the phase change heat absorption ring (14) is filled with paraffin-graphene.

8. The NdFeB powder mixing barrel of claim 1, wherein: The pressure sensor and the material level sensor are respectively fixed on the inner wall of the barrel (1) at upper, middle and lower positions.

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