Powder feeding and spheroidizing device for solving superfine powder component segregation

Abstract

The invention relates to the technical field of spheroidizing and powder feeding, in particular to a powder feeding and spheroidizing device for solving superfine powder composition segregation, the device comprises a powder feeding assembly and a spheroidizing assembly, and the powder feeding assembly is used for conveying superfine powder into the spheroidizing assembly for spheroidizing; the powder feeding assembly comprises a powder tank, a powder taking pipe and a powder feeding pipe, a powder falling opening is formed in the bottom of the powder tank, superfine powder in the powder tank falls into the powder taking pipe through the powder falling opening, one end of the powder taking pipe is arranged outside the powder tank, and the other end of the powder taking pipe penetrates through the powder tank to be communicated with the powder feeding pipe; the spheroidizing assembly comprises a spheroidizing cavity, the spheroidizing cavity is arranged at the bottom of the powder feeding pipe, a powder inlet is formed in the position, corresponding to the powder feeding pipe, of the spheroidizing cavity, a laser is arranged outside the spheroidizing cavity, a laser inlet is formed in the position, corresponding to the laser, of the outer wall of the spheroidizing cavity, and a plurality of reflectors are arranged on the inner wall of the spheroidizing cavity. The problem of composition segregation in the ultrafine powder conveying and spheroidizing process can be solved.

Description

Technical Field

[0001] The present invention relates to the technical fields of spheroidization and powder feeding, and relates to a powder feeding and spheroidization device for solving the component segregation of ultrafine powder, and specifically relates to a powder feeding and laser spheroidization device for ultrafine powder with a particle size less than 10 μm. Background Art

[0002] Powders with a particle diameter less than 10 μm have a large specific surface area and small size effects, and have broad application prospects in the fields of materials science, energy, environment, and medicine. For example, high-performance metal composite materials with high temperature resistance, wear resistance, high strength, and high density can be prepared by using additive manufacturing technology with ultrafine powder with a particle diameter less than 10 μm. Since the agglomeration of powders increases as the particle size decreases, when a large amount of powder is fed, powders with a particle diameter less than 10 μm are prone to agglomeration, which is extremely likely to cause powder blockage and thus interrupt the operation of the equipment.

[0003] Currently, there are very few devices on the market suitable for feeding a large amount of powder with a particle diameter less than 10 μm, and they usually have the defect of easy powder blockage. At the same time, for the mainstream spheroidization device using ultrafine powder - the plasma spheroidization device, its central temperature is very high, up to 10000 K, and the temperature is not adjustable. When using a plasma spheroidization device to spheroidize powders, especially ultrafine powders, it is easy to cause the vaporization loss of some low - melting - point metals in the ultrafine powders, resulting in the segregation of the elemental composition of the powders. By using laser as the heat source, the laser power can be adjusted according to powders with different particle sizes to ensure that the composition of the powders meets the standards of the metal grades. Summary of the Invention

[0004] In order to improve the deficiencies of the prior art, the present invention provides a powder feeding and spheroidization device for solving the component segregation of ultrafine powder, which can improve at least one of the following problems: smoothly realize the powder feeding of ultrafine powder with a particle size less than 10 μm, improve the spheroidization efficiency, and solve the problem of component segregation during the spheroidization of current ultrafine powder.

[0005] As described above, the present invention provides a powder feeding and spheroidization device for solving the component segregation of ultrafine powder, including a powder feeding component and a spheroidization component. The powder feeding component is used to transfer ultrafine powder into the spheroidization component for spheroidization.

[0006] The powder feeding component includes a powder tank, a powder taking pipe, and a powder feeding pipe. A powder dropping port is provided at the bottom of the powder tank. The powder dropping port is arranged at the top of the powder taking pipe. An opening is provided at the position of the powder taking pipe corresponding to the powder dropping port. The ultrafine powder in the powder tank falls into the powder taking pipe through the powder dropping port. One end of the powder taking pipe is arranged outside the powder tank, and the other end passes through the powder tank and is communicated with the powder feeding pipe.

[0007] The spheroidizing component includes a spheroidizing cavity which is arranged at the bottom of the powder feeding tube. An inlet for powder is arranged at the position where the spheroidizing cavity corresponds to the powder feeding tube. A laser is arranged outside the spheroidizing cavity, and a laser inlet is arranged at the position where the outer wall of the spheroidizing cavity corresponds to the laser. A plurality of reflectors are arranged on the inner wall of the spheroidizing cavity, and the laser beam can be reflected between different reflectors to form multiple laser beams for melting ultrafine powder in the spheroidizing cavity.

[0008] According to an embodiment of the present invention, the height of each reflector is different. After the laser entering from the laser inlet enters the uppermost first reflector, it is reflected into the next reflector, that is, the laser can be successively reflected between reflectors at different heights.

[0009] According to an embodiment of the present invention, a light collecting component is also arranged in the spheroidizing cavity, and the laser reflected by the lowermost reflector can enter the light collecting component.

[0010] According to an embodiment of the present invention, the powder outlet is composed of a baffle which is inclined to form a funnel shape with a large upper part and a small lower part.

[0011] According to an embodiment of the present invention, during operation, both the powder feeding component and the spheroidizing component are in a vacuum state to prevent the ultrafine powder from being oxidized or contaminated.

[0012] According to an embodiment of the present invention, a heater is arranged on the powder tank, and the heater is used to heat the ultrafine powder in the powder tank. The heater can adopt a structure known in the art, such as a heating plate arranged outside the powder tank.

[0013] According to an embodiment of the present invention, the heating plate controls the temperature in the powder tank to be 30 - 40 °C, for example 35 °C. At this temperature, not only can the fluidity of the powder be improved, but also powder explosion will not be caused in a vacuum environment.

[0014] According to an embodiment of the present invention, a vibrator is also arranged at the bottom of the powder tank, and the vibrator is used to drive the powder tank to vibrate so as to disperse the agglomerated ultrafine powder and make it enter the powder taking tube.

[0015] According to an embodiment of the present invention, a spiral rod is arranged in the powder taking tube, and spiral blades are arranged on the spiral rod. The length of the spiral rod is slightly longer than that of the powder taking tube, so that one end of the spiral rod close to the powder feeding tube extends into the powder feeding tube. A motor is arranged on the side of the spiral rod far from the spheroidizing component, and the motor is used to drive the spiral rod and the spiral blades to rotate, thereby pushing the ultrafine powder in the powder taking tube to run towards the spheroidizing component and enter the powder feeding pipe fitting.

[0016] According to an embodiment of the present invention, the powder feeding pipe is vertically arranged at the end of the powder taking pipe, and the powder feeding pipe is communicated with the powder taking pipe. The top of the powder feeding pipe is connected to the air inlet pipe. The bottom of the air inlet pipe faces the end of the screw rod, and the gas in the air inlet pipe can blow the ultrafine powder at the end of the screw rod into the powder feeding pipe.

[0017] According to an embodiment of the present invention, the powder feeding pipe and the air inlet pipe are an integral pipeline. The top end of the air inlet pipe is communicated with an external gas source. The external gas source is used to provide inert gas, such as nitrogen, helium, argon, etc. The external gas source is connected to the air inlet pipe through a pipeline, and a gas flow regulating valve is arranged on the pipeline to control the flow rate of the inert gas entering the air inlet pipe.

[0018] According to an embodiment of the present invention, a deflector plate is arranged at the bottom of the powder inlet. The deflector plate is in a funnel-shaped structure, and the center of the funnel-shaped structure coincides with the center of the spheroidizing cavity.

[0019] According to an embodiment of the present invention, an air extraction pump is arranged at the lower part of the spheroidizing cavity, and a powder collecting barrel is arranged at the bottom. The air extraction pump evacuates the whole system to a vacuum state, and at the same time guides the ultrafine powder to move towards the lower part of the spheroidizing cavity.

[0020] According to an embodiment of the present invention, the periphery of the powder collecting barrel is provided with water to cool the spheroidized powder.

[0021] According to an embodiment of the present invention, the laser inlet is arranged at the upper part of the spheroidizing cavity.

[0022] According to an embodiment of the present invention, the number of the reflecting mirrors is 2 to 4, for example, 3. The laser beam is reflected by the reflecting mirrors and finally falls on the light collecting component. The inside of the light collecting part is provided with water to absorb the remaining laser power.

[0023] According to an embodiment of the present invention, a cover is arranged outside the reflecting mirror, and a light passing hole is arranged on the cover for the laser to pass through.

[0024] According to an embodiment of the present invention, a plurality of air nozzles are arranged around the cover. The air nozzles are communicated with an external gas source to inflate the inside of the cover, and the gas sprays out from the light passing hole to prevent the ultrafine powder from approaching the reflecting mirror.

[0025] In a second aspect, the present invention also provides a method for powder spheroidization using the above device, including the following steps:

[0026] S1. Adjust the laser incident angle of the laser and the position of the reflecting mirror to form a complete laser optical path, and turn on the heating plate;

[0027] S2. Connect the powder feeding assembly to the powder feeding pipe and evacuate to make the inside of the device in a vacuum state;

[0028] S3. Start the vibrator to make the ultrafine powder fall into the powder extraction tube along the baffle from the powder dropping port;

[0029] S4. Start the laser and start the motor to rotate the spiral blade. The powder falling into the powder extraction tube is transported to the end of the powder extraction tube along the rotating spiral blade;

[0030] S5. Input inert gas into the intake pipe to form a pressure difference, and the powder is sucked into the powder feeding pipe and enters the spheroidization chamber for spheroidization.

[0031] According to an embodiment of the present invention, the vibration rate of the vibrator is 30 - 50 Hz, for example, 40 Hz.

[0032] According to an embodiment of the present invention, the laser power is 6000 - 9000 W, for example, 7000 W.

[0033] According to an embodiment of the present invention, the flow rate of the inert gas is 8 - 20 L / min, for example, 10 L / min.

[0034] Beneficial effects

[0035] 1) The present invention proposes a powder feeding and spheroidizing device for ultrafine powder. A number of reflectors are arranged in the spheroidization chamber. According to the number of reflectors, the laser incident angle and the position of the reflectors are adjusted (to make the light beam reflect evenly in the device), so that the ultrafine powder falling from the powder feeding pipe passes through the propagation path of the laser and is melted by the laser. The laser is reflected multiple times by the reflectors to form multiple laser light paths on the downward path of the ultrafine powder, and the falling powder is remelted. The probability of the ultrafine powder contacting the laser beam becomes larger, thereby increasing the probability of the powder being spheroidized, and making the spheroidization rate greater than 95%.

[0036] 2) The present invention uses laser as the heat source and controls the laser power to change the energy of the laser beam, that is, the temperature of the laser beam. It can adjust the laser power according to ultrafine powder with different particle sizes and different compositions, avoid the loss of low melting point components in the powder due to too high temperature, solve the problem of component segregation of ultrafine powder, and ensure that the composition of the powder meets the standards of the metal grade.

[0037] 3) The present invention proposes a powder feeding and spheroidizing device for ultrafine powder. A spiral rod and spiral blades are arranged in the powder feeding pipe. The thrust of the spiral blades is used to ensure smooth powder feeding and solve the problem of powder blockage; a heater and a vibrator are arranged on the powder tank. By adjusting the parameters of the vibrator, the traveling speed of the spiral blades and the powder feeding gas flow rate, the powder feeding amount can be controlled in real time, so that the powder feeding amount can be greater than 4 Kg / h, realizing the increase of production capacity. Combined with the laser spheroidization technology, the powder is melted and forms a sphere under the action of surface tension, thereby realizing the continuous mass production of spherical fine powder. Description of the drawings

[0038] Figure 1 Schematic structural diagram of a powder feeding and spheroidizing device for solving the segregation of ultrafine powder components;

[0039] Figure 2 Schematic structural diagram of the lid.

[0040] 1 - Powder dropping port, 2 - Powder taking pipe, 3 - Motor, 4 - Air inlet pipe, 5 - Powder feeding pipe, 6 - Powder tank, 7 - Vibrator, 8 - Heating plate, 9 - Baffle plate, 10 - Laser, 11 - Reflecting mirror, 12 - Light receiving component, 13 - Powder collecting bucket, 14 - Air extraction pump, 15 - Lid, 16 - Light passing hole, 17 - Air nozzle, 18 - Spheroidizing cavity, 19 - Deflector plate. Specific embodiments

[0041] The following will further elaborate on the structure and application of the present invention in combination with specific embodiments. It should be understood that the following embodiments are only for illustrative and explanatory purposes of the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0042] Unless otherwise specified, the raw materials and reagents used in the following embodiments are all commercially available products, or can be prepared by known methods.

[0043] Example 1

[0044] See Figure 1 As shown, the present invention provides a powder feeding and spheroidizing device for solving the segregation of ultrafine powder components, including a powder feeding component and a spheroidizing component. The powder feeding component is used to convey ultrafine powder into the spheroidizing component for spheroidizing. During operation, both the powder feeding component and the spheroidizing component are in a vacuum state to prevent the ultrafine powder from being oxidized or contaminated.

[0045] The powder feeding component includes a powder tank 6, a powder taking pipe 2, and a powder feeding pipe 5. A powder dropping port 1 is provided at the bottom of the powder tank 6. The powder dropping port 1 is located at the top of the powder taking pipe 2. The powder dropping port 1 is composed of a baffle plate 9. The baffle plate 9 is inclined to form a funnel shape with a larger upper part and a smaller lower part. An opening is provided at the corresponding position of the powder taking pipe 2 and the powder dropping port 1. The ultrafine powder in the powder tank 6 falls into the powder taking pipe 2 through the powder dropping port 1. One end of the powder taking pipe 2 is arranged outside the powder tank 6, and the other end passes through the powder tank 6 and is connected to the powder feeding pipe 5.

[0046] A heater is provided on the powder tank 6. The heater is used to heat the ultrafine powder in the powder tank 6. The heater can adopt a structure known in the art, such as a heating plate 8 provided on the outside of the powder tank 6. A vibrator 7 is also provided at the bottom of the powder tank 6. The vibrator 7 is used to drive the powder tank 6 to vibrate, so that the agglomerated ultrafine powder is dispersed and enters the powder extraction pipe 2. The heating plate 8 controls the temperature in the powder tank 6 to be 30-40 °C, for example 35 °C. At this temperature, not only can the fluidity of the powder be improved, but also powder explosion will not be caused in a vacuum environment.

[0047] A screw rod is provided in the powder extraction pipe 2, and screw blades are provided on the screw rod. The length of the screw rod is slightly longer than that of the powder extraction pipe 2, so that one end of the screw rod close to the powder feeding pipe 5 extends into the powder feeding pipe 5. A motor 3 is provided on the side of the screw rod away from the spheroidizing assembly. The motor 3 is used to drive the screw rod and the screw blades to rotate, so as to push the ultrafine powder in the powder extraction pipe 2 towards the spheroidizing assembly and enter the spheroidizing assembly.

[0048] During use, the powder feeding amount can be adjusted by adjusting the vibration frequency of the vibrator and the rotation speed of the screw rod. The greater the frequency of the vibrator, the faster the powder feeding rate. At the same time, the rotation speed of the screw rod is also adjusted to match to avoid powder blockage. In practical applications, the parameters of the vibrator and the screw rod are adjusted according to actual needs.

[0049] The powder feeding pipe 5 is vertically arranged at the end of the powder extraction pipe 2, and the powder feeding pipe 5 is communicated with the powder extraction pipe 2. The top of the powder feeding pipe 5 is connected to the air inlet pipe 4. The bottom of the air inlet pipe 4 faces the end of the screw rod. The gas in the air inlet pipe 4 can blow the ultrafine powder at the end of the screw rod into the powder feeding pipe 5. In this embodiment, the powder feeding pipe 5 and the air inlet pipe 4 are an integrated pipeline. The top end of the air inlet pipe 4 is communicated with an external gas source. The external gas source is used to provide inert gas, such as nitrogen, helium, argon, etc. The external gas source is connected to the air inlet pipe 4 through a pipeline, and a gas flow regulating valve is provided on the pipeline to control the flow rate of the inert gas entering the air inlet pipe 4.

[0050] The spheroidizing assembly includes a spheroidizing cavity 18. The spheroidizing cavity 18 is arranged at the bottom of the powder feeding pipe 5. An inlet powder port is provided at the position corresponding to the powder feeding pipe 5 on the spheroidizing cavity 18. A diversion plate 19 is provided at the bottom of the inlet powder port. The diversion plate 19 has a funnel-shaped structure, and the center of the funnel-shaped structure coincides with the center of the spheroidizing cavity 18.

[0051] A laser 10 is provided outside the spheroidizing chamber 18, an air extraction pump 14 is provided at the lower part, and a powder collection barrel 13 is provided at the bottom. The air extraction pump 14 evacuates the whole system to a vacuum state, and at the same time guides the ultrafine powder to move towards the lower part of the spheroidizing chamber 18. A laser inlet is provided at the position corresponding to the outer wall of the spheroidizing chamber 18 and the laser 10, and the laser inlet is provided at the upper part of the spheroidizing chamber 18; a light receiving component 12 and a number of reflectors 11 are provided on the inner wall of the spheroidizing chamber 18. The heights of the light receiving component 12 and each reflector 11 are different. After the laser entering from the laser inlet enters the uppermost first reflector 11, it is reflected into the next reflector 11, that is, the laser can be successively reflected between the reflectors 11 at different heights and finally enter the light receiving component 12.

[0052] The incident laser is collimated light. By adjusting the laser incident angle and the position of the reflector 11, the laser incident angle is usually set to 10 - 15 degrees, so that the ultrafine powder falling from the powder feeding tube 5 passes through the propagation path of the laser and is melted by the laser. The laser is reflected multiple times by the reflector 11 to remelt the falling powder. In order to utilize the remaining power of the laser in this application, a reflection optical path is set through the reflector 11. However, when the powder is transmitted to the second optical path, new powder has reached the first optical path, and there is not much remaining power on the second optical path, so only a small amount of remaining powder can be melted. When refracted to the fourth optical path, the remaining power is already extremely low, and after passing through the second and third optical paths, all the powder has been basically melted.

[0053] The ultrafine powder falling from the powder feeding tube 5 travels towards the lower part of the spheroidizing chamber 18 under the action of gravity and the air extraction pump 14. The ultrafine powder passing through the laser beam is melted and becomes spherical under the action of surface tension and falls into the powder collection barrel 13. Water is circulated around the powder collection barrel 13 to cool the spheroidized powder.

[0054] The present invention uses a number of reflectors 11 to reflect the laser multiple times to form multiple laser optical paths on the downward path of the ultrafine powder, increasing the probability of contact between the ultrafine powder and the laser beam, thereby increasing the probability of spheroidizing the powder.

[0055] In this embodiment, the number of reflectors 11 is 3. The laser beam is reflected by the reflector 11 and finally falls on the light receiving component 12. Water is circulated inside the light receiving part 12 to absorb the remaining laser power. See Figure 1 As shown, the whole laser spheroidizing device is in a negative pressure state under the action of the air extraction pump 14. In order to prevent the ultrafine powder from contaminating the reflector 11, a cover 15 is provided outside the reflector 11. A through hole 16 is drilled in the center of the cover 15 for the laser to pass through. A number of air nozzles 17 are provided around the cover 15. The air nozzles 17 are connected to an external air source to inflate the inside of the cover 15, and the gas is ejected from the through hole 16 to prevent the ultrafine powder from approaching the reflector 11.

[0056] The present invention can convey a large amount of ultra-fine powder with a particle size less than 10 μm, and adjust the powder feeding amount in real time by the parameters of the vibrator 7, the parameters of the motor 3, and the flow rate of argon gas in the air inlet pipe 4. At the same time, the laser power can be adjusted in coordination with the powder feeding amount.

[0057] Example 2

[0058] The method of spheroidizing using the device in Example 1 (where the number of reflectors is 3 and the heater temperature is 35 °C) includes the following steps:

[0059] 1. Adjust the laser incident angle of the laser and the position of the reflector.

[0060] 2. Turn on the heating plate.

[0061] 3. Connect the powder feeding assembly to the powder feeding pipe and evacuate to make the whole system in a vacuum state.

[0062] 4. Start the vibrator, and the ultra-fine powder falls from the powder dropping port along the baffle into the powder taking pipe.

[0063] 5. Start the laser and start the motor. At this time, the spiral blade starts to rotate, and the powder falling into the powder taking pipe is transported to the end of the powder taking pipe along the rotating spiral blade.

[0064] 6. Input a certain flow rate of argon gas into the air inlet pipe. Under the action of the pressure difference, the powder is sucked into the lower powder feeding pipe (the powder feeding pipe is in a negative pressure state), and then enters the laser spheroidizing equipment for spheroidizing.

[0065] During the operation, the powder feeding amount can be adjusted in real time by adjusting the parameters of the vibrator, the parameters of the motor, and the flow rate of argon gas in the air inlet pipe. At the same time, the laser power is adjusted in coordination with the powder feeding amount.

[0066] Specifically, load titanium alloy powder with a particle size range of 1 - 10 μm into the powder tank. The melting point of the titanium alloy powder is about 1700 °C. Adjust the temperature of the heating plate to 35 °C, adjust the vibrator parameter to 40 Hz, the laser power to 7000 W, the motor parameter to 42 r / min, the flow rate of argon gas in the air inlet pipe to 10 L / min, the purity of argon gas to 99.999%, and the powder feeding amount to 4 Kg / h. The spheroidization rate of the powder obtained at one time is greater than 95%.

[0067] Example 3

[0068] In this example, in addition to using titanium alloy powder, stainless steel powder with a melting point of about 1500 °C is also used. Adjust the vibrator parameter to 35 Hz, the laser power to 6500 W, the motor parameter to 37 r / min, the flow rate of argon gas in the air inlet pipe to 10 L / min, and the powder feeding amount to 5 Kg / h. Other conditions are the same as those in Example 2. The spheroidization rate of the powder obtained at one time is greater than 95%.

[0069] Example 4

[0070] In this example, except that no heater is provided on the powder tank, other conditions are the same as those in Example 2. Under this condition, the powder feeding rate is 2 Kg / h. A powder feeding rate greater than this value will cause powder blockage in the powder pipe. The spheroidization rate of the powder obtained at one time is greater than 95%.

[0071] Example 5

[0072] In this example, except that no reflector is provided and only one laser pipeline is set to spheroidize the powder, other conditions are the same as those in Example 2. Finally, the spheroidization rate of the powder obtained is less than 90%.

[0073] Example 6

[0074] In this example, except that 2 reflectors are provided, other conditions are the same as those in Example 2. Finally, the spheroidization rate of the powder obtained is less than 94%.

[0075] The specific implementation modes of the present invention are exemplarily described above through examples. However, the protection scope of the present invention is not limited to the above exemplary implementation modes. Any modifications, equivalent replacements, improvements, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A powder feeding and spheroidizing device for solving the segregation of ultrafine powder components, characterized in that: It includes a powder delivery component and a spheroidizing component, wherein the powder delivery component is used to deliver ultrafine powder to the spheroidizing component for spheroidization; The powder delivery assembly comprises a powder tank, a powder collection pipe and a powder delivery pipe. The bottom of the powder tank is provided with a powder drop opening, the powder drop opening is provided at the top of the powder collection pipe, the powder collection pipe is provided with an opening at a position corresponding to the powder drop opening, the ultrafine powder in the powder tank falls into the powder collection pipe through the powder drop opening, one end of the powder collection pipe is provided outside the powder tank, and the other end passes through the powder tank and is connected to the powder delivery pipe; The spheroidizing component comprises a spheroidizing chamber, which is arranged at the bottom of a powder feeding tube, a powder inlet is arranged at a position corresponding to the powder feeding tube, a laser is arranged outside the spheroidizing chamber, a laser inlet is arranged at a position corresponding to the laser on the outer wall of the spheroidizing chamber, and a plurality of reflectors are arranged on the inner wall of the spheroidizing chamber, and a laser beam can be reflected between different reflectors to form multiple laser beams for melting ultrafine powder in the spheroidizing chamber.

2. The powder feeding and spheroidizing device for solving the segregation of ultrafine powder components according to claim 1 is characterized in that: The height of each reflector is different. The laser light incident from the laser inlet enters the first reflector at the top and is then reflected into the next reflector. That is, the laser light can be reflected in sequence between reflectors at different heights. Preferably, a light-collecting component is further provided in the spheroidizing chamber, and the laser reflected by the reflector located at the bottom can enter the light-collecting component.

3. The powder feeding and spheroidizing device for solving the segregation of ultrafine powder components according to claim 1 is characterized in that: The powder tank is provided with a heater, and the heater is used to heat the ultrafine powder in the powder tank. Preferably, the heating plate controls the temperature in the powder tank to be 30-40°C. Preferably, a vibrator is further provided at the bottom of the powder tank, and the vibrator is used to drive the powder tank to vibrate so that the agglomerated ultrafine powder is dispersed and enters the powder taking tube.

4. The powder feeding and spheroidizing device for solving the segregation of ultrafine powder components according to claim 1, characterized in that: A spiral rod is arranged in the powder collecting tube, and a spiral blade is arranged on the spiral rod. The length of the spiral rod is greater than the powder collecting tube, so that one end of the spiral rod close to the powder feeding tube extends into the powder feeding tube. A motor is arranged on the side of the spiral rod away from the spheroidizing component, and the motor is used to drive the spiral rod and the spiral blade to rotate, thereby pushing the ultrafine powder in the powder collecting tube to run toward the spheroidizing component and enter the powder feeding tube.

5. The powder feeding and spheroidizing device for solving the segregation of ultrafine powder components according to any one of claims 1 to 4, characterized in that: The powder delivery pipe is vertically arranged at the end of the powder collection pipe, and the powder delivery pipe is connected to the powder collection pipe. The top of the powder delivery pipe is connected to the air inlet pipe. The bottom of the air inlet pipe faces the end of the screw rod. The gas in the air inlet pipe can blow the ultrafine powder at the end of the screw rod into the powder delivery pipe.

6. The powder feeding and spheroidizing device for solving the problem of ultrafine powder component segregation according to claim 5, characterized in that: The powder delivery pipe and the air inlet pipe are an integrated pipeline, and the top end of the air inlet pipe is connected to an external air source, and the external air source is used to provide inert gas.

7. The powder feeding and spheroidizing device for solving the problem of ultrafine powder component segregation according to any one of claims 1 to 4, characterized in that: A guide plate is arranged at the bottom of the powder inlet, the guide plate is in a funnel-shaped structure, and the center of the funnel-shaped structure coincides with the center of the spheroidizing cavity.

8. The powder feeding and spheroidizing device for solving the problem of ultrafine powder component segregation according to any one of claims 1 to 4, characterized in that: The lower part of the spheroidizing chamber is provided with an air pump, and the bottom is provided with a powder collecting bucket. The air pump draws the whole system into a vacuum state and guides the ultrafine powder to move to the lower part of the spheroidizing chamber.

9. The powder feeding and spheroidizing device for solving the problem of ultrafine powder component segregation according to any one of claims 1 to 4, characterized in that: The number of the reflectors is 2 to 4, for example, 3. The laser beam is reflected by the reflectors and finally falls on the light receiving component. Water flows inside the light receiving component to absorb the remaining laser power.

10. The powder feeding and spheroidizing device for solving the problem of ultrafine powder component segregation according to any one of claims 1 to 4, characterized in that: A cover is provided on the outside of the reflector, and a light-through hole is provided on the cover for the laser to pass through. A plurality of air nozzles are provided around the cover, and the air nozzles are connected to an external air source for inflating the inside of the cover. The gas is ejected from the light-through hole to prevent ultrafine powder from approaching the reflector.

Images