Alloy powder preparation device for 3D printing and preparation method thereof

Abstract

The invention relates to the technical field of alloy powder preparation and discloses an alloy powder preparation device for 3D printing and a preparation method thereof.The alloy powder preparation device is mainly composed of a support, a sealing barrel, an alloy groove, an atomizer, an atomizing nozzle, an annular pipe and the like, and a connecting rope is fixedly connected to the portion, located on the lower side of the atomizer, of the side wall of an inner cavity of the sealing barrel; a screen is fixedly connected to the end, away from the sealing barrel, of the connecting rope, a ball is movably embedded in the middle of the bottom face of the screen, a spring is fixedly connected to the bottom of the ball, and a connecting column is fixedly connected to the bottom end of the spring. When an alloy solution is blown out by high-pressure inert gas and forms alloy powder, airflow of the high-pressure inert gas is directly blown to the screen, and the screen swings under the action of air pressure under the action of the balls and the springs, so that the alloy powder is screened, qualified powder is screened out through the screen, and the alloy powder is obtained. And unqualified powder with irregular shapes can remain on the screen, so that the powder screening effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of alloy powder preparation, and particularly relates to an alloy powder preparation device for 3D printing and a preparation method thereof. Background Art

[0002] Metal alloy 3D printing is the most potential and cutting-edge technology in the entire 3D field. 3D printing metal alloy powder is the key material for printing metal components. The particles of 3D printing metal alloy powder usually require uniform particles, uniform composition, low oxygen content, good sphericity and good fluidity. Commonly used 3D printing metal alloy powders include cobalt-chromium alloy, titanium alloy, stainless steel, etc.

[0003] Existing alloy powders are mainly prepared by processing methods such as electrode induction melting gas atomization, plasma inert gas atomization and rotating electrode atomization. Among them, plasma inert gas atomization is more common. Its processing method is mainly to melt the alloy by electromagnetic heating, and then use high-pressure inert gas to blow the melted alloy, so as to form small-particle alloy powder. Since this alloy powder is blown by high-pressure inert gas, the formed alloy powder is either large or small, and the alloy powder can only be screened separately after the processing is completed. Secondly, the temperature of the formed alloy powder is still relatively high and has a certain plasticity. Therefore, the alloy powder will accumulate inside the sealed cylinder after forming, and the powder will stick due to the action of high temperature after standing still, resulting in deformities in the alloy powder, uneven formed alloy powder, thereby reducing the quality of the alloy powder and even affecting the later use of the alloy powder. Summary of the Invention

[0004] The present application provides an alloy powder preparation device for 3D printing and a preparation method thereof, which have the advantages of being able to screen alloy powder, the unqualified powder after screening can be reheated and melted, reducing the probability of oxidation of the alloy solution inside the alloy tank, being able to knead the alloy powder, improving the powder uniformity, and preventing the powder from standing still for a long time, so as to solve the technical problems such as the inability to screen alloy powder and uneven preparation.

[0005] To achieve the above object, the present application adopts the following technical solution: An alloy powder preparation device for 3D printing, including a bracket, and further including: The sealing cylinder is fixedly installed at the top of the bracket. In the middle of the top surface of the sealing cylinder, an alloy groove is provided. Inside the sealing cylinder cavity, an electromagnetic heating coil is fixedly installed outside the alloy groove. In the middle of the bottom surface of the electromagnetic heating coil, a connecting pipe is fixedly installed. At the bottom end of the connecting pipe, an atomizer is fixedly installed. The side wall of the atomizer is fixedly connected to the inner side wall of the bracket. Inside the atomizer, a gas passage is provided. In the middle of the bottom surface of the atomizer, an atomizing nozzle is fixedly installed. The lower opening of the gas passage extends into the inside of the atomizing nozzle; The support frame is fixedly installed on the upper part of the left side wall of the sealing cylinder. A high-pressure inert gas cylinder is fixedly clamped on the support frame. In the middle of the bottom surface of the high-pressure inert gas cylinder, an air pipe is fixedly installed. In the middle of the outer surface of the sealing cylinder, a fixed rod is fixedly installed. One end of the fixed rod away from the sealing cylinder is fixedly connected to an annular pipe. On the side of the annular pipe close to the sealing cylinder, a conduit is fixedly connected. The conduit connects the air pipe and the gas passage; The discharge pipe is fixedly connected to the middle of the bottom surface of the sealing cylinder. One end of the discharge pipe away from the sealing cylinder is fixedly connected to a powder absorber.

[0006] Furthermore, the sealing cylinder includes: The connecting rope is fixedly connected to the inner side wall of the sealing cylinder cavity and is located below the atomizer; The screen is fixedly connected to one end of the connecting rope away from the sealing cylinder; The ball is movably embedded in the middle of the bottom surface of the screen; The spring is fixedly connected to the bottom of the ball.

[0007] Furthermore, the spring includes: The connecting column is fixedly connected to the bottom end of the spring; The receiving groove is fixedly connected to the bottom end of the connecting column; The discharge port is opened at the bottom of the receiving groove and is located outside the connecting column.

[0008] Furthermore, the screen includes: The collecting groove is fixedly connected to the outside of the screen; The through hole is opened at the bottom of the collecting groove; The corrugated pipe is fixedly connected to the bottom of the collecting groove and is located outside the bottom opening of the through hole.

[0009] Furthermore, the corrugated pipe includes: The return pipe is fixedly connected to the bottom end of the corrugated pipe. One end of the return pipe away from the corrugated pipe penetrates through the side wall of the sealing cylinder and extends into the alloy groove. After the return pipe extends out of the sealing cylinder, it first slopes downward and then vertically upward; An air duct is fixedly connected to the outer surface of the downwardly inclined portion of the return pipe. One end of the air duct away from the return pipe is fixedly connected to the annular pipe and communicates with the inside of the annular pipe.

[0010] Furthermore, the screen further includes: A through groove is opened on the side wall of the screen, and the through groove communicates the inside of the screen with the collection tank.

[0011] Furthermore, the screen and the connecting column further include: A magnet is fixedly arranged on the bottom surface of the screen; A conical block is movably sleeved on the outer surface of the connecting column, and there is a gap between the conical block and the receiving groove; A magnetic block is fixedly arranged inside the conical block.

[0012] Furthermore, the position of the magnet is misaligned with the position of the magnetic block, and the magnetism of the magnet is the same as that of the magnetic block.

[0013] A preparation method of an alloy powder preparation device for 3D printing includes the following steps: In the first step, the alloy is placed in the alloy tank, and then the electromagnetic heating coil is turned on. The alloy is heated and melted into an alloy solution by the electromagnetic heating coil. Then the high-pressure inert gas cylinder is turned on, and the high-pressure inert gas inside the high-pressure inert gas cylinder enters the gas channel through the transmission of the air pipe and the conduit. When the alloy solution flows through the atomizing nozzle, the alloy solution is blown apart by the high-pressure inert gas, promoting the alloy solution to form small-particle alloy powder.

[0014] In the second step, the blown alloy powder falls on the screen under the drive of the high-pressure inert gas. Since the screen is suspended and fixed by the connecting rope, at this time, under the action of the air pressure of the high-pressure inert gas, the screen shakes inside the sealed cylinder, and the alloy powder is screened by the shaking of the screen. The qualified alloy powder will fall to the lower side of the screen, and the unqualified alloy powder will stay on the upper side of the screen.

[0015] In the third step, the qualified alloy powder will fall on the receiving groove after screening. Since the receiving groove is connected to the screen through the ball, the spring and the connecting column, and the force is single, when the screen shakes, it will also drive the receiving groove to shake irregularly, increasing the residence time of the qualified alloy powder on the receiving groove, thereby promoting the cooling of the alloy powder.

[0016] In the fourth step, the unqualified alloy powder staying above the sieve will enter the collection tank through the through groove due to the shaking of the sieve. The collection tank will shake synchronously with the sieve, causing the irregular powder to enter the through holes and be transported into the return pipe through the corrugated pipe. Then, high-pressure inert gas is introduced into the return pipe through the gas guide pipe. Finally, the high-pressure inert gas is used to carry the unqualified powder in the return pipe into the alloy tank, and the probability of oxidation of the alloy solution inside the alloy tank will be reduced after the high-pressure inert gas enters the alloy tank along with the return pipe.

[0017] In the fifth step, the shaking of the sieve drives the magnet to shake. Then, due to the magnetic repulsion between the magnet and the magnetic block, the magnetic block drives the conical block to rotate in the receiving tank. Since the temperature of the alloy powder is relatively high and still plastic at this time, the rotation of the receiving tank is used to knead the alloy powder, making the alloy powder in the receiving tank more uniform after forming. The formed alloy powder will be discharged into the discharge pipe through the discharge port and finally collected by the powder absorber.

[0018] An alloy powder preparation device for 3D printing provided by the present application is designed with a connecting rope, a sieve, a ball, a spring, a connecting column, a receiving tank, etc. When the alloy solution is blown out by high-pressure inert gas to form alloy powder, since the air flow of the high-pressure inert gas directly blows on the sieve, at this time, due to the action of the ball and the spring, the sieve sways due to the air pressure, thereby screening the alloy powder. The qualified powder will be screened out by the sieve, while the unqualified powder with irregular shapes will remain on the sieve, thus achieving the effect of powder screening.

[0019] Secondly, after the qualified alloy powder is screened by the sieve, it will fall on the receiving tank. Through the connection of the ball, the spring and the connecting column, the sieve will drive the receiving tank to shake synchronously during the shaking process. Since the force application point of the connection between the sieve and the receiving tank is single, and the ball is movably embedded at the bottom of the sieve, the receiving tank cannot maintain regular shaking, allowing the alloy powder to have enough time to shake inside the receiving tank, thus ensuring that the alloy powder has enough time to cool down and preventing the formed alloy powder from sticking and becoming irregular in shape due to excessive temperature and stillness.

[0020] Secondly, the unqualified powder separated by the screen will be discharged from the through groove due to the shaking of the screen and enter the collecting tank. Since the collecting tank is fixedly connected to the screen, the collecting tank will also shake synchronously with the screen, and then the unqualified powder will enter the through hole through the shaking of the collecting tank, and enter the bottom of the inclined part of the return pipe through the through hole and the bellows, and then the high-pressure inert gas is introduced into the return pipe through the air guide pipe, so that the unqualified powder in the return pipe is pushed into the alloy tank by the high-pressure inert gas, and the unqualified powder is heated for the second time and blown into powder by the high-pressure inert gas again, which greatly improves the powder formation rate of the alloy, and the inert gas discharged from the return pipe will also act on the alloy solution inside the alloy tank, so that the oxidation probability of the alloy solution is reduced, thereby improving the quality of the alloy powder.

[0021] Secondly, by designing conical blocks, magnets and magnetic blocks, when the screen shakes due to the pressure of the high-pressure inert gas, the magnetic repulsion of the magnet on the magnetic block causes the conical block to rotate inside the receiving slot, and the alloy powder will fall into the gap between the conical block and the receiving slot after being discharged through the screen. At this time, the rotation of the conical block causes the alloy powder in the gap between the conical block and the receiving slot to be affected by the force of the rotation of the conical block. At this time, the temperature of the alloy powder is relatively high and has a certain plasticity, which causes the alloy powder to be rubbed into a regular circle by the rotating conical block, thereby improving the quality and uniformity of the alloy powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute a part of the specification, illustrate the embodiments disclosed in the present application and, together with the description, serve to explain the principles disclosed in the present application.

[0023] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the sealing cylinder of the present invention; Figure 3 It is a structural schematic diagram of the atomizer and the screen of the present invention; Figure 4 This is a schematic diagram of the internal structure of the receiving tank of the present invention; Figure 5 It is a schematic diagram of the split structure of the screen, receiving trough and conical block of the present invention.

[0024] Wherein: 1. Support; 2. Sealing cylinder; 21. Connecting rope; 22. Sieve mesh; 221. Through groove; 222. Magnet; 23. Ball; 24. Spring; 25. Connecting column; 251. Tapered block; 252. Magnetic block; 26. Receiving groove; 27. Discharge port; 28. Collection tank; 281. Through hole; 282. Bellows; 283. Return pipe; 284. Air duct; 3. Alloy tank; 4. Electromagnetic heating coil; 5. Connecting pipe; 6. Atomizer; 7. Gas passage; 8. Atomizing nozzle; 9. Support frame; 10. High-pressure inert gas cylinder; 11. Air pipe; 12. Fixed rod; 13. Annular pipe; 14. Conduit; 15. Discharge pipe; 16. Powder absorber. Detailed implementation manner

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] Please refer to Figures 1 - 5 , an alloy powder preparation device for 3D printing, including a support 1, a sealing cylinder 2 is fixedly installed at the top of the support 1, an alloy tank 3 is opened in the middle of the top surface of the sealing cylinder 2, an electromagnetic heating coil 4 is fixedly installed outside the alloy tank 3 in the inner cavity of the sealing cylinder 2, a connecting pipe 5 is fixedly installed in the middle of the bottom surface of the electromagnetic heating coil 4, an atomizer 6 is fixedly installed at the bottom end of the connecting pipe 5, the side wall of the atomizer 6 is fixedly connected to the side wall of the inner cavity of the support 1, a gas passage 7 is opened inside the atomizer 6, an atomizing nozzle 8 is fixedly installed in the middle of the bottom surface of the atomizer 6, and the lower opening of the gas passage 7 extends into the inside of the atomizing nozzle 8.

[0027] A support frame 9 is fixedly installed on the upper part of the left side wall of the sealing cylinder 2, a high-pressure inert gas cylinder 10 is fixedly clamped on the support frame 9, an air pipe 11 is fixedly installed in the middle of the bottom surface of the high-pressure inert gas cylinder 10, a fixed rod 12 is fixedly installed in the middle of the outer surface of the sealing cylinder 2, one end of the fixed rod 12 away from the sealing cylinder 2 is fixedly connected to an annular pipe 13, and a conduit 14 is fixedly connected to one side of the annular pipe 13 close to the sealing cylinder 2. The conduit 14 connects the air pipe 11 and the gas passage 7.

[0028] A discharge pipe 15 is fixedly connected to the middle of the bottom surface of the sealing cylinder 2, and a powder absorber 16 is fixedly connected to one end of the discharge pipe 15 away from the sealing cylinder 2 for collecting the formed alloy powder.

[0029] Please refer to Figures 1 - 5, a connecting rope 21 is fixedly connected to the inner cavity side wall of the sealing cylinder 2 below the atomizer 6. One end of the connecting rope 21 away from the sealing cylinder 2 is fixedly connected to a screen 22, facilitating the suspension of the screen 22 inside the sealing cylinder 2 and enabling the screen 22 to shake within the sealing cylinder 2. A ball 23 is movably inlaid in the middle of the bottom surface of the screen 22, and a spring 24 is fixedly welded to the bottom of the ball 23.

[0030] Please refer to Figures 1 - 5 , the bottom end of the spring 24 is fixedly welded to a connecting column 25, and the bottom end of the connecting column 25 is fixedly welded to a receiving groove 26. Through the connection of the connecting column 25, the spring 24, and the ball 23, the stress point between the receiving groove 26 and the screen 22 is single, ensuring that the receiving groove 26 can shake irregularly. An outlet 27 is provided on the bottom of the receiving groove 26 outside the connecting column 25, facilitating the discharge of qualified alloy powder after forming.

[0031] Please refer to Figures 1 - 5 , a collecting groove 28 is fixedly welded to the outside of the screen 22. A through hole 281 is provided at the bottom of the collecting groove 28. A corrugated pipe 282 is fixedly connected to the outside of the bottom opening of the through hole 281 at the bottom of the collecting groove 28, ensuring that unqualified alloy powder can enter the through hole 281 through the shaking of the collecting groove 28 and be discharged by the corrugated pipe 282.

[0032] Please refer to Figures 1 - 5 , the bottom end of the corrugated pipe 282 is fixedly connected to a return pipe 283, ensuring that unqualified alloy powder will be introduced into the return pipe 283 through the corrugated pipe 282. One end of the return pipe 283 away from the corrugated pipe 282 penetrates the side wall of the sealing cylinder 2 and extends into the alloy tank 3, ensuring that the powder in the return pipe 283 can enter the alloy tank 3 for secondary addition and melting. After the return pipe 283 extends out of the sealing cylinder 2, it first inclines downward and then vertically upward, facilitating the movement of the powder in the return pipe 283. An air guide pipe 284 is fixedly connected to the outer surface of the downward-inclined part of the return pipe 283. One end of the air guide pipe 284 away from the return pipe 283 is fixedly connected to the annular pipe 13 and is in communication with the inside of the annular pipe 13, ensuring that the high-pressure inert gas in the annular pipe 13 can enter the return pipe 283 through the air guide pipe 284 to push the alloy powder to move.

[0033] Please refer to Figures 1 - 5 , a through slot 221 is provided on the side wall of the screen 22, and the through slot 221 communicates the inside of the screen 22 with the collecting groove 28, facilitating the unqualified powder on the screen 22 to enter the collecting groove 28 through the through slot 221.

[0034] Please refer to Figures 1 - 5, a magnet 222 is fixedly arranged on the bottom surface of the sieve mesh 22, a conical block 251 is movably sleeved on the outer surface of the connecting column 25, there is a gap between the conical block 251 and the receiving groove 26, which is convenient for the conical block 251 to knead the alloy powder, and a magnetic block 252 is fixedly arranged inside the conical block 251.

[0035] Please refer to Figures 1 - 5 , the position of the magnet 222 is misaligned with the position of the magnetic block 252, and the magnetism of the magnet 222 is the same as that of the magnetic block 252, ensuring that the magnet 222 can use magnetic repulsion to drive the magnetic block 252 to drive the conical block 251 to rotate.

[0036] A preparation method of an alloy powder preparation device for 3D printing includes the following steps: In the first step, the alloy is put into the alloy tank 3, and then the electromagnetic heating coil 4 is turned on. The alloy is heated and melted into an alloy solution by the electromagnetic heating coil 4. Then the high-pressure inert gas cylinder 10 is turned on. The high-pressure inert gas inside the high-pressure inert gas cylinder 10 enters the gas channel 7 through the transmission of the air pipe 11 and the conduit 14. When the alloy solution flows through the atomizing nozzle 8, the alloy solution is dispersed by the high-pressure inert gas, promoting the alloy solution to form small-particle alloy powder.

[0037] In the second step, the dispersed alloy powder falls on the sieve mesh 22 driven by the high-pressure inert gas. Since the sieve mesh 22 is suspended and fixed by the connecting rope 21, at this time, under the action of the air pressure of the high-pressure inert gas, the sieve mesh 22 shakes inside the sealed cylinder 2, and the alloy powder is screened by the shaking of the sieve mesh 22. The qualified alloy powder will fall to the lower side of the sieve mesh 22, and the unqualified alloy powder will stay on the upper side of the sieve mesh 22.

[0038] In the third step, the qualified alloy powder will fall on the receiving groove 26 after screening. Since the receiving groove 26 is connected to the sieve mesh 22 through the balls 23, springs 24 and connecting columns 25, and the force is single, when the sieve mesh 22 shakes, it will also drive the receiving groove 26 to shake irregularly, increasing the residence time of the qualified alloy powder on the receiving groove 26, thereby promoting the cooling of the alloy powder.

[0039] In the fourth step, the unqualified alloy powder staying on the upper side of the sieve mesh 22 will enter the collection tank 28 through the through groove 221 due to the shaking of the sieve mesh 22. The collection tank 28 will shake synchronously with the sieve mesh 22, so that the irregular powder will enter the through hole 281 and be transmitted through the corrugated pipe 282 into the return pipe 283. Then, high-pressure inert gas is introduced into the return pipe 283 through the air guide pipe 284. Finally, the high-pressure inert gas is used to bring the unqualified powder in the return pipe 283 into the alloy tank 3, and the high-pressure inert gas will reduce the probability of oxidation of the alloy solution inside the alloy tank 3 after entering the alloy tank 3.

[0040] In the fifth step, the shaking of the sieve 22 drives the shaking of the magnet 222. Then, through the magnetic repulsion between the magnet 222 and the magnetic block 252, the magnetic block 252 drives the conical block 251 to rotate in the receiving groove 26. Since the temperature of the alloy powder is relatively high at this time and still has plasticity, the rotation of the receiving groove 26 is used to knead the alloy powder, making the alloy powder in the receiving groove 26 more uniform after forming. The formed alloy powder will be discharged into the discharge pipe 15 through the discharge port 27 and finally collected by the powder absorber 16.

[0041] Working principle: When the alloy needs to be processed into alloy powder, the alloy is placed inside the alloy tank 3, and then the electromagnetic heating coil 4 is turned on. The electromagnetic heating coil 4 is used to heat the alloy, promoting the alloy to melt into an alloy solution. After that, the high-pressure inert gas cylinder 10 is turned on. When the alloy solution flows into the atomizer 6 and the atomizing nozzle 8 through the connecting pipe 5, the high-pressure inert gas transmitted through the gas channel 7 will disperse the alloy solution, promoting the alloy solution to form small-particle alloy powder. During this process, since the airflow of the high-pressure inert gas directly blows on the screen 22, at this time, through the action of the balls 23 and the springs 24, the screen 22 sways due to the air pressure, thereby screening the alloy powder. The qualified powder will be screened out through the screen 22, while the unqualified powder with irregular shapes will remain on the screen 22. The qualified alloy powder will fall on the receiving tank 26 after being screened by the screen 22. Through the connection of the balls 23, the springs 24, and the connecting columns 25, the screen 22 will drive the receiving tank 26 to sway synchronously during the swaying process. Since the force application point between the screen 22 and the receiving tank 26 is single, and the balls 23 are movably embedded at the bottom of the screen 22, the receiving tank 26 cannot maintain regular swaying, enabling the alloy powder to have sufficient time to sway inside the receiving tank 26, thereby ensuring that the alloy powder has sufficient time to cool down, preventing the formed alloy powder from sticking due to excessive temperature and static influence, resulting in irregular powder shapes. The unqualified powder screened out by the screen 22 will be discharged from the through slot 221 under the action of the swaying of the screen 22 and enter the collection tank 28. Since the collection tank 28 is fixedly connected to the screen 22, the collection tank 28 will also sway synchronously with the screen 22. Furthermore, through the swaying of the collection tank 28, the unqualified powder will enter the through hole 281, and be transmitted through the through hole 281 and the corrugated pipe 282 to the bottom of the inclined part of the return pipe 283. Then, the high-pressure inert gas is introduced into the return pipe 283 through the air guide pipe 284, thereby using the high-pressure inert gas to push the unqualified powder in the return pipe 283 into the alloy tank 3, reheating the unqualified powder and blowing it into powder again by the high-pressure inert gas, greatly improving the powder forming rate of the alloy. Moreover, the inert gas discharged from the return pipe 283 will also act on the alloy solution inside the alloy tank 3, reducing the oxidation probability of the alloy solution and improving the quality of the alloy powder. Secondly, by designing the tapered block 251, the magnet 222, the magnetic block 252, etc., when the screen 22 sways due to the air pressure of the high-pressure inert gas, through the magnetic repulsion force of the magnet 222 on the magnetic block 252, the tapered block 252 will rotate inside the receiving tank 26. After the alloy powder is discharged through the screen 22, it will fall into the gap between the tapered block 251 and the receiving tank 26. At this time, through the rotation of the tapered block 251, the alloy powder in the gap between the tapered block 251 and the receiving tank 26 will be affected by the acting force during the rotation of the tapered block 251. Since the alloy powder has a relatively high temperature and certain plasticity at this time,This causes the alloy powder to be rubbed into a regular circle by the rotating conical block 251, thereby improving the quality and uniformity of the alloy powder. The formed alloy powder is transported into the discharge pipe 15 through the discharge port 27 and is finally collected by the powder absorber 16.,

Claims

1. An alloy powder preparation device for 3D printing, comprising a bracket (1), characterized in that: Also includes: A sealing cylinder (2) is fixedly mounted on the top of the bracket (1); an alloy groove (3) is provided in the middle of the top surface of the sealing cylinder (2); an electromagnetic heating coil (4) is fixedly mounted on the inner cavity of the sealing cylinder (2) outside the alloy groove (3); a connecting pipe (5) is fixedly mounted in the middle of the bottom surface of the electromagnetic heating coil (4); an atomizer (6) is fixedly mounted at the bottom end of the connecting pipe (5); a side wall of the atomizer (6) is fixedly connected to the side wall of the inner cavity of the bracket (1); a gas channel (7) is provided inside the atomizer (6); an atomizing nozzle (8) is fixedly mounted in the middle of the bottom surface of the atomizer (6); and a lower opening of the gas channel (7) extends into the interior of the atomizing nozzle (8); A support frame (9) is fixedly mounted on the upper portion of the left side wall of the sealing cylinder (2); a high-pressure inert gas bottle (10) is fixedly clamped on the support frame (9); a gas pipe (11) is fixedly mounted in the middle of the bottom surface of the high-pressure inert gas bottle (10); a fixing rod (12) is fixedly mounted in the middle of the outer surface of the sealing cylinder (2); an annular tube (13) is fixedly connected to one end of the fixing rod (12) away from the sealing cylinder (2); a conduit (14) is fixedly connected to one side of the annular tube (13) close to the sealing cylinder (2); the conduit (14) connects the gas pipe (11) with the gas channel (7); A discharge pipe (15) is fixedly connected to the middle portion of the bottom surface of the sealing cylinder (2); one end of the discharge pipe (15) away from the sealing cylinder (2) is fixedly connected to a powder absorber (16).

2. The alloy powder preparation device for 3D printing according to claim 1, characterized in that: The sealing cylinder (2) comprises: A connecting rope (21) fixedly connected to the inner cavity side wall of the sealing cylinder (2) and located at the lower side of the atomizer (6); A screen (22) fixedly connected to an end of the connecting rope (21) away from the sealing cylinder (2); A ball (23) movably embedded in the middle of the bottom surface of the screen (22); The spring (24) is fixedly connected to the bottom of the ball (23).

3. The alloy powder preparation device for 3D printing according to claim 2, characterized in that: The spring (24) comprises: A connecting column (25) fixedly connected to the bottom end of the spring (24); A receiving groove (26) fixedly connected to the bottom end of the connecting column (25); The discharge port (27) is opened at the bottom of the receiving groove (26) and is located outside the connecting column (25).

4. The alloy powder preparation device for 3D printing according to claim 3, characterized in that: The screen (22) comprises: A collecting tank (28) fixedly connected to the outside of the screen (22); A through hole (281) is formed at the bottom of the collecting tank (28); The bellows (282) is fixedly connected to the bottom of the collecting tank (28) and is located outside the bottom opening of the through hole (281).

5. The alloy powder preparation device for 3D printing according to claim 4, characterized in that: The bellows (282) comprises: A return pipe (283) is fixedly connected to the bottom end of the bellows (282); one end of the return pipe (283) away from the bellows (282) penetrates the side wall of the sealing cylinder (2) and extends into the alloy groove (3); after extending out of the sealing cylinder (2), the return pipe (283) first tilts downward and then vertically upward; The air guide pipe (284) is fixedly connected to the outer surface of the downwardly inclined portion of the return pipe (283); one end of the air guide pipe (284) away from the return pipe (283) is fixedly connected to the annular pipe (13) and communicates with the interior of the annular pipe (13).

6. The alloy powder preparation device for 3D printing according to claim 5, characterized in that: The screen (22) also includes: A through groove (221) is provided on a side wall of the screen (22), and the through groove (221) connects the inner side of the screen (22) with the collecting groove (28).

7. The alloy powder preparation device for 3D printing according to claim 6, characterized in that: The screen (22) and the connecting column (25) also include: A magnet (222) fixedly disposed on the bottom surface of the screen (22); A conical block (251) is movably sleeved on the outer surface of the connecting column (25), and a gap exists directly between the conical block (251) and the receiving groove (26); The magnetic block (252) is fixedly arranged inside the conical block (251).

8. The alloy powder preparation device for 3D printing according to claim 7, characterized in that: The position of the magnet (222) is misaligned with the position of the magnetic block (252), and the magnetism of the magnet (222) is the same as the magnetism of the magnetic block (252).

9. The method for preparing an alloy powder preparation device for 3D printing according to claims 1 to 8, characterized in that: The following steps are involved: The first step is to place the alloy into the alloy tank (3), and then turn on the electromagnetic heating coil (4). The electromagnetic heating coil (4) is used to heat and melt the alloy into an alloy solution, and then turn on the high-pressure inert gas bottle (10). The high-pressure inert gas in the high-pressure inert gas bottle (10) enters the gas channel (7) through the gas pipe (11) and the conduit (14). When the alloy solution flows through the atomizing nozzle (8), the high-pressure inert gas is used to disperse the alloy solution, so that the alloy solution is formed into small particles of alloy powder. In the second step, the blown alloy powder is driven by the high-pressure inert gas to fall onto the screen (22). Since the screen (22) is suspended and fixed by the connecting rope (21), the air pressure of the high-pressure inert gas causes the screen (22) to shake inside the sealing cylinder (2). The alloy powder is screened by the shaking of the screen (22). The alloy powder that passes the screening will fall on the lower side of the screen (22), and the alloy powder that fails the screening will stay on the upper side of the screen (22); In the third step, the qualified alloy powder will fall onto the receiving trough (26) after being screened. Since the receiving trough (26) is connected to the screen (22) via the ball (23), the spring (24) and the connecting column (25), and is subjected to a single force, when the screen (22) shakes, the receiving trough (26) will also be driven to shake irregularly, thereby increasing the residence time of the qualified alloy powder on the receiving trough (26), thereby promoting the cooling of the alloy powder. In the fourth step, the unqualified alloy powder remaining on the upper side of the screen (22) will enter the collecting tank (28) through the through slot (221) due to the shaking of the screen (22), and the collecting tank (28) will shake synchronously with the screen (22), so that the irregular powder will enter the through hole (281) and enter the return pipe (283) through the transmission of the bellows (282), and then the high-pressure inert gas will be introduced into the return pipe (283) through the air guide pipe (284), and finally the unqualified powder in the return pipe (283) will be brought into the alloy tank (3) by the high-pressure inert gas, and after the high-pressure inert gas enters the alloy tank (3) through the return pipe (283), the probability of oxidation of the alloy solution in the alloy tank (3) will be reduced; In the fifth step, the shaking of the screen (22) is used to drive the magnet (222) to shake, and then the magnetic repulsion between the magnet (222) and the magnetic block (252) causes the magnetic block (252) to drive the conical block (251) to rotate in the receiving groove (26). Since the temperature of the alloy powder is relatively high at this time, it is still plastic, so the rotation of the receiving groove (26) is used to knead the alloy powder, so that the alloy powder in the receiving groove (26) is more uniform after molding. The molded alloy powder is discharged into the discharge pipe (15) through the discharge port (27) and is finally collected by the powder absorber (16).

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