Preparation device and preparation method of feed for metal powder injection molding

Abstract

The invention provides a feed preparation device and method for metal powder injection molding, and belongs to the technical field of metal injection molding. The feed preparation device for metal powder injection molding comprises a fixing ring; the connecting plate is fixedly connected to the upper end of the fixing ring; the solution output pipe is fixedly connected to the upper end of the connecting plate; and the multiple sets of atomization mechanisms are arranged, each set of atomization mechanism comprises an airflow output pipe, a first spraying opening, a limiting sliding groove, a limiting sliding block, a flow dividing pipe, an external expansion plate, an air connecting opening and a second spraying opening, and in the fine metal powder preparation work, while the gas impact force is increased, a second impact airflow is increased, and the forming rate of the fine metal powder is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of metal injection molding, and in particular relates to a feeding preparation device and a preparation method for metal powder injection molding. Background Art

[0002] In the prior art, atomization powder making is a powder making method that uses a fast-moving fluid (atomizing medium) to impact or otherwise break up a metal or alloy liquid into fine droplets, which are then condensed into solid powder.

[0003] After searching, it was found that a metal powder and its gas atomization preparation method were disclosed in a Chinese patent with the authorization announcement number "CN106670480B". The gas atomization preparation method includes the following steps: gas atomization device setting: the gas atomization device includes an atomization nozzle and an atomization tower; the atomization nozzle is used to atomize the molten metal; the atomization tower has an atomization chamber, and the atomization chamber is used to accommodate the metal droplets formed after the metal liquid is atomized; the atomization chamber includes a heating area; gas atomization: obtaining the metal liquid; after the metal liquid is atomized by the atomization nozzle, atomized droplets are formed in the atomization chamber, and after being heated by the heating device, it is cooled and collected to obtain the metal powder. The gas atomization preparation method of the metal powder of the present invention innovatively sets a heating device in the gas atomization device to heat the metal droplets after gas atomization, which can effectively eliminate satellite particles on the surface of the metal particles, and the surface quality of the prepared metal powder is better, and better metal powder fluidity is obtained.

[0004] The above-mentioned new and innovative method is to set a heating device in the atomization device to heat the atomized metal droplets, which can effectively eliminate satellite particles on the surface of the metal particles. The method of refining metal particles in the above-mentioned invention and the prior art is usually to change the impact force of gas and water flow to refine the metal powder. When the metal solution is crushed by impact, the size of the crushed metal is random and cannot be accurately controlled. No matter how the impact strength of the medium is changed, large particles of metal powder will exist in the formed metal powder. Summary of the invention

[0005] The purpose of the present invention is to provide a feeding preparation device and a preparation method for metal powder injection molding, aiming to solve the problem in the prior art that when the metal solution is crushed by impact, the size of the crushed metal is random and cannot be accurately controlled, and no matter how the impact strength of the medium is changed, large particles of metal powder will exist in the molded metal powder.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A feeding material preparation device for metal powder injection molding, comprising:

[0008] Fixed ring;

[0009] A connecting plate, the connecting plate being fixedly connected to the upper end of the fixing ring;

[0010] A solution output pipe, wherein the solution output pipe is fixedly connected to the upper end of the connecting plate;

[0011] Atomization mechanism, the atomization mechanism is provided with multiple groups, each group of the atomization mechanism includes an airflow output pipe, a first nozzle, a limiting slide groove, a limiting slider, a diverter pipe, an external expansion plate, an air inlet and a second nozzle, the airflow output pipe is arranged on the upper side of the fixed ring, the first nozzle is arranged at the output end of the airflow output pipe, the limiting slide groove is opened at the lower end of the airflow output pipe, the limiting slider is fixedly connected to the upper end of the fixed ring, the limiting slider slides in the limiting slide groove, the diverter pipe is arranged at the lower end of the airflow output pipe, the external expansion plate is arranged on the lower side of the fixed ring, the air inlet is opened at the upper end of the fixed ring, the lower end of the diverter pipe is fixedly connected to the upper end of the air inlet, the second nozzle is opened at one side end of the external expansion plate, and the second nozzle is communicated with the air inlet.

[0012] As a preferred solution of the present invention, the outlets of the plurality of first nozzles are inclined downward, and the openings of the plurality of second nozzles are blocked by a plurality of outer expansion plates respectively.

[0013] As a preferred solution of the present invention, a rotating ring is provided on the outer side of the fixed ring, the lower end of the rotating ring is fixedly connected to the base plate, the upper end of the base plate is provided with a gear ring, the lower end of the base plate is fixedly connected to a supporting rotating ring, the lower end of the fixed ring is provided with a supporting rotating groove, and the supporting rotating ring rotates in the supporting rotating groove.

[0014] As a preferred solution of the present invention, a fixed shaft slot is provided at the upper end of each of the outer expansion plates, and a movable shaft slot is provided at the lower end of each of the outer expansion plates. A plurality of fixed shaft blocks are fixedly connected to the circumferential inner wall of the fixed ring, and the lower ends of the plurality of fixed shaft blocks respectively rotate in the plurality of fixed shaft slots. A plurality of movable shaft blocks are fixedly connected to the lower end of the supporting rotating groove, and the plurality of movable shaft blocks respectively rotate in the plurality of movable shaft slots.

[0015] As a preferred solution of the present invention, when the openings of the plurality of second nozzles are opened, the output direction of the plurality of second nozzles is the center of the solution output pipe.

[0016] As a preferred solution of the present invention, a plurality of connecting rotating blocks are fixedly connected to the upper end of the rotating ring, a connecting rotating groove is opened on one side end of each of the limiting sliding grooves, and the plurality of connecting rotating blocks rotate in the plurality of connecting rotating grooves respectively.

[0017] As a preferred solution of the present invention, the upper end of each of the airflow output pipes is fixedly connected to an air connection pipe, and each of the air connection pipes is connected to an external air pressure pump.

[0018] As a preferred solution of the present invention, a collection cooling barrel is provided on the lower side of the fixing ring, one side end of the collection cooling barrel is fixedly connected to a support seat, the upper end of the support seat is fixedly connected to a driving motor, the output end of the driving motor is fixedly connected to a gear, and the gear is meshed with a gear ring.

[0019] As a preferred solution of the present invention, each of the airflow output pipes is provided with a high-pressure air pipe, and the high-pressure air pipe is respectively connected to the air connecting pipe, the first nozzle and the diversion pipe.

[0020] A method for preparing feed material for metal powder injection molding according to the present invention comprises the following steps:

[0021] S1, the solution output pipe is connected to the discharge port of the molten metal tank, the collecting cooling barrel at the lower end is connected to the metal powder cooling and collecting device, and an atomized metal powder preparation device is arranged between the solution output pipe and the collecting cooling barrel. When the metal solution flows out of the solution output pipe, it is broken into fine droplets by the impact of high-pressure gas, and these droplets are then cooled and solidified to form;

[0022] S2. When a coarser metal powder needs to be produced, the outlet directions of the multiple airflow output pipes do not coincide with the center of the solution output pipe, thereby reducing the shear force of the metal solution when it is impacted by the high-pressure gas, so that the particles of the metal solution that are crushed by the impact are larger. When performing powder injection molding, larger particles have lower costs, and the injection pressure can be reduced during the injection process, reducing the equipment load;

[0023] S3. When finer metal powder needs to be made, the driving motor drives the gear ring to rotate clockwise at a small angle, thereby changing the gas outlet direction of the multiple first nozzles, so that the gas outlet direction of the multiple first nozzles is the center of the solution output pipe, thereby increasing the shear force when the gas impacts the metal solution. While the gear ring rotates, the second nozzle opening at the lower end opens to form a secondary impact. The metal particles initially crushed by the first nozzle can be crushed into fine metal powder after the second impact airflow. During metal injection molding, it has better fluidity, which helps to fill complex mold cavities during the injection process and reduce the occurrence of defects.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Through this device, in the preparation of fine metal powder, while increasing the gas impact force, a second impact airflow is added, and the larger metal particles produced by the first impact airflow are broken for the second time to ensure the molding rate of the fine metal powder. The metal powder produced at this time has better fluidity during metal injection molding, which helps to fill complex mold cavities during the injection process and reduce the occurrence of defects.

[0026] 2. Through this device, in the preparation of coarse powder, while keeping the gas impact force small, the gas output direction is changed to reduce the shear force on the metal solution, and the second impact airflow is closed to avoid excessive refinement of the metal powder. At this time, the injection molding cost of the prepared metal powder is low, and the injection pressure can be reduced during the injection process to reduce the equipment load.

[0027] 3. Through this device, the refinement mode of the metal powder can be flexibly changed through the atomization mechanism, so that the device can prepare metal powders of different sizes, increasing the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a structural stereogram of the present invention;

[0030] Figure 2 It is a cross-sectional view of the structure in the present invention;

[0031] Figure 3 It is a cross-sectional exploded view of the first structure in the present invention;

[0032] Figure 4 It is a cross-sectional exploded view of the second structure in the present invention;

[0033] Figure 5 It is a cross-sectional exploded view of the third structure in the present invention;

[0034] Figure 6 It is a cross-sectional exploded view of the fourth structure in the present invention;

[0035] Figure 7 It is a cross-sectional exploded view of the fifth structure in the present invention;

[0036] Figure 8 It is a cross-sectional exploded view of the sixth structure in the present invention;

[0037] Fig. 9 It is a cross-sectional exploded view of the seventh structure in the present invention;

[0038] Fig.10 It is a structural cross-sectional view of the airflow output pipe in the present invention.

[0039] In the figure: 1. fixed ring; 2. air flow output pipe; 3. first nozzle; 4. limit slide groove; 5. limit slider; 6. connecting plate; 7. solution output pipe; 8. shunt pipe; 9. external expansion plate; 10. air inlet; 11. second nozzle; 12. rotating ring; 13. bottom plate; 14. gear ring; 15. support rotating groove; 16. support rotating ring; 17. fixed shaft slot; 18. movable shaft slot; 19. fixed shaft plug-in block; 20. movable shaft plug-in block; 21. connecting rotating groove; 22. connecting rotating block; 23. air connecting pipe; 24. collecting cooling barrel; 25. supporting seat; 26. driving motor; 27. gear; 28. high-pressure air pipe.

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] See also Figure 1-Figure 10 , the present invention provides the following technical solutions:

[0043] A feeding material preparation device for metal powder injection molding, comprising:

[0044] Fixed ring 1;

[0045] A connecting plate 6, the connecting plate 6 is fixedly connected to the upper end of the fixing ring 1;

[0046] A solution output pipe 7, the solution output pipe 7 is fixedly connected to the upper end of the connecting plate 6;

[0047] Atomization mechanism, the atomization mechanism is provided with multiple groups, each group of atomization mechanisms includes an airflow output pipe 2, a first nozzle 3, a limiting slide groove 4, a limiting slider 5, a diverter pipe 8, an external expansion plate 9, an air inlet 10 and a second nozzle 11. The airflow output pipe 2 is arranged on the upper side of the fixed ring 1, the first nozzle 3 is arranged at the output end of the airflow output pipe 2, the limiting slide groove 4 is opened at the lower end of the airflow output pipe 2, the limiting slider 5 is fixedly connected to the upper end of the fixed ring 1, the limiting slider 5 slides in the limiting slide groove 4, the diverter pipe 8 is arranged at the lower end of the airflow output pipe 2, the external expansion plate 9 is arranged on the lower side of the fixed ring 1, the air inlet 10 is opened at the upper end of the fixed ring 1, the lower end of the diverter pipe 8 is fixedly connected to the upper end of the air inlet 10, the second nozzle 11 is opened at one side end of the external expansion plate 9, and the second nozzle 11 is connected to the air inlet 10.

[0048] In a specific embodiment of the present invention, the fixed ring 1 provides support for the atomizing mechanism. When the metal powder is produced by the atomizing method, the fixed ring 1 remains fixed. The fixed ring 1 is supported on the lower end of the solution output pipe 7 by the connecting plate 6. The solution output pipe 7 is connected to the discharge port of the molten metal tank. The molten metal liquid is poured out from the solution output pipe 7. During the falling process, it is impacted into metal powder by the atomizing mechanism. The airflow output pipe 2 is a drainage pipe for the impact airflow. The impact airflow is ejected from the first nozzle 3. The opening of the first nozzle 3 is inclined downward, and the opening position is parallel to the lower end of the solution output pipe 7. When the coarse powder is produced, multiple outer expansion plates 9 fit each other. The opening of the second nozzle 11 is blocked, and the airflow outlets of the multiple first nozzles 3 do not overlap with the center of the solution output pipe 7 to reduce the shear force of the impact airflow on the metal solution. When the metal solution falls, since the second nozzle 11 is blocked, only the first nozzle 3 has an impact airflow to control the molding size of the metal powder. At this time, the metal powder molding particles are coarser. When the coarse powder is subjected to powder injection molding, the larger particles have a lower cost, and the injection pressure can be reduced during the injection process to reduce the equipment load. When it is necessary to prepare finer metal powder, the output power of the impact air pressure pump is enhanced to ensure the impact strength of the double air holes. , and start the driving device to pull the multiple connecting grooves 21 backwards, the middle position of the airflow output pipe 2 is limited by the limiting slider 5, and the limiting slider 5 slides in the limiting slide groove 4 to provide a rotation space for the airflow output pipe 2, the rear end of the airflow output pipe 2 is rotated and the middle is fixed, so that the output direction of the multiple first nozzles 3 is changed, and the gas outlet direction of the multiple first nozzles 3 is aligned with the center of the circle at the lower end of the solution output pipe 7. At this time, the shear force of the multiple impact airflows on the metal solution is greater, and the metal particles can be further refined. The diverter pipe 8 is arranged at the lower end of the airflow output pipe 2, which is the second gas outlet of the airflow output pipe 2. When the driving device When the rear end of the airflow output pipe 2 is driven to rotate, one side end of the multiple expansion plates 9 is also rotated, thereby expanding the multiple expansion plates 9 in a circular manner. At this time, the expansion plates 9 that block the multiple second nozzles 11 slide to the other side of the second nozzles 11 due to the expansion, and then the second nozzles 11 are opened. The multiple second nozzles 11 form a second impact airflow at the lower end of the first nozzle 3. While increasing the shear force of the first impact airflow, the metal solution is subjected to a second refinement impact. The metal powder produced at this time has better fluidity during metal injection molding, which helps to fill complex mold cavities during the injection process and reduce the occurrence of defects.

[0049] For details, please refer to Figure 1-Figure 10 The output ports of the plurality of first nozzles 3 are inclined downward, and the openings of the plurality of second nozzles 11 are blocked by the plurality of external expansion plates 9 respectively.

[0050] In the present embodiment: the openings of the plurality of first nozzles 3 are inclined downward, and the impact force of the airflow on the metal solution when it flows out is also inclined downward. While refining multiple metals, the formed metal powder is ensured to flow downward to avoid the powder being retained at the air outlet of the first nozzle 3. When preparing coarse metal powder, the second nozzle 11 is blocked by the outer expansion plate 9 and no second impact airflow is formed. When preparing fine metal powder, the second nozzle 11 is opened to form a second impact airflow. The impact of the double impact airflow can further refine the larger particles produced in the first impact airflow, and the effect is better than the refinement effect of the high-pressure single impact airflow.

[0051] For details, please refer to Figure 1 - Figure 10, a rotating ring 12 is provided on the outer side of the fixed ring 1, the lower end of the rotating ring 12 is fixedly connected to a bottom plate 13, the upper end of the bottom plate 13 is provided with a gear ring 14, the lower end of the bottom plate 13 is fixedly connected to a supporting rotating ring 16, the lower end of the fixed ring 1 is provided with a supporting rotating groove 15, and the supporting rotating ring 16 rotates in the supporting rotating groove 15.

[0052] In this embodiment: the rotating ring 12 is a larger annular ring arranged outside the fixed ring 1, the fixed ring 1 is fixed by the solution output pipe 7, and the rotating ring 12 can rotate outside the fixed ring 1, and a supporting rotating ring 16 is fixed at the lower end of the bottom plate 13. The spherical protrusion at the upper end of the supporting rotating ring 16 rotates in the supporting rotating groove 15 and provides support for the rotating ring 12. A gear ring 14 is provided at the upper end of the bottom plate 13, and the driving mechanism drives the rotating ring 12 to rotate through the gear ring 14. The middle part of the rotating ring 12 is fixed to the fixed ring 1, and the rear end is fixed to the rotating ring 12. When the rotating ring 12 rotates, the output direction of the first nozzle 3 is adjusted, and the shear force on the metal solution is changed.

[0053] For details, please refer to Figure 1-Figure 10 A fixed shaft slot 17 is provided at the upper end of each outer expansion plate 9, and a movable shaft slot 18 is provided at the lower end of each outer expansion plate 9. A plurality of fixed shaft blocks 19 are fixedly connected to the circumferential inner wall of the fixed ring 1, and the lower ends of the plurality of fixed shaft blocks 19 rotate in the plurality of fixed shaft slots 17 respectively. A plurality of movable shaft blocks 20 are fixedly connected to the lower end of the supporting rotating groove 15, and the plurality of movable shaft blocks 20 rotate in the plurality of movable shaft slots 18 respectively.

[0054] In this embodiment: the fixed shaft block 19 is fixed to the solution output pipe 7, the protruding cylinder at the lower end of the fixed shaft block 19 is stuck in the fixed shaft slot 17 to support the outward expansion plate 9, the movable shaft block 20 is connected to the lower end of the support rotating ring 16 and rotates with the movable shaft block 20. When the rotating ring 12 rotates, one side of the outward expansion plate 9 is fixed by the fixed shaft block 19, and the middle part is pulled backward by the movable shaft block 20, so that multiple outward expansion plates 9 are fitted together and expanded outward. While the circumference formed by the multiple outward expansion plates 9 is expanding outward, the second nozzle 11 whose opening is blocked by the outward expansion plate 9 is opened. At this time, the second air outlet channel is drained through the diverter pipe 8 to form a second impact airflow. The two impact airflows can ensure the forming rate of fine metal powder.

[0055] For details, please refer to Figure 1-Figure 10 When the openings of the plurality of second nozzles 11 are opened, the output direction of the plurality of second nozzles 11 is the center of the solution output tube 7 .

[0056] In this embodiment: when the outward expansion plate 9 is pulled outward by the movable shaft plug block 20, the opening direction of the second nozzle 11 also changes until the multiple second nozzles 11 are fully opened. At this time, the output direction of the multiple second nozzles 11 is the same as that of the first nozzle 3, and they are all aligned with the center of the solution output pipe 7, so that the shear force of the impact airflow on the metal solution reaches the maximum.

[0057] For details, please refer to Figure 1-Figure 10 A plurality of connecting rotating blocks 22 are fixedly connected to the upper end of the rotating ring 12 , and a connecting rotating groove 21 is opened at one side end of each limiting sliding groove 4 , and the plurality of connecting rotating blocks 22 rotate in the plurality of connecting rotating grooves 21 respectively.

[0058] In this embodiment: the connecting groove 21 is opened at the rearmost end of the airflow output pipe 2, the connecting block 22 is fixed on the limiting slide groove 4, and the connecting block 22 passes through the opening of the connecting groove 21, and the upper end cylinder of the connecting block 22 is clamped on the upper end of the airflow output pipe 2 to fix the airflow output pipe 2. When the rotating ring 12 rotates, the rear side of the airflow output pipe 2 is driven to rotate through the connecting block 22, thereby changing the output direction of the first nozzle 3.

[0059] For details, please refer to Figure 1-Figure 10 The upper end of each air flow output pipe 2 is fixedly connected to an air connection pipe 23, and each air connection pipe 23 is connected to an external air pressure pump.

[0060] In this embodiment, the air pipe 23 is connected to an external air pressure pump to input a high-pressure airflow of an inert gas to the first nozzle 3 and the second nozzle 11, and the output power is adjusted by the external air pressure pump to control the shear force formed by the impact airflow.

[0061] For details, please refer to Figure 1-Figure 10A collecting cooling barrel 24 is provided on the lower side of the fixing ring 1, and a support seat 25 is fixedly connected to one side end of the collecting cooling barrel 24, and a driving motor 26 is fixedly connected to the upper end of the support seat 25. A gear 27 is fixedly connected to the output end of the driving motor 26, and the gear 27 is meshed with the gear ring 14.

[0062] In this embodiment: the collecting and cooling barrel 24 is arranged at the lower side of the solution output pipe 7, and is connected to the metal powder cooling and collecting device. The metal particles crushed into powder fall from the collecting and cooling barrel 24 for cooling and collection. The support seat 25 is used to support and fix the driving motor 26. When it is necessary to change the output direction of the first nozzle 3, the driving motor 26 drives the gear 27 to rotate, and then drives the gear ring 14 to rotate clockwise at a small angle. While changing the output direction of the first nozzle 3, the airflow output pipe 2 is prevented from contacting the connecting plate 6.

[0063] For details, please refer to Figure 1-Figure 10 A high-pressure air pipe 28 is provided in each air flow output pipe 2, and the high-pressure air pipe 28 is respectively connected to the air receiving pipe 23, the first nozzle 3 and the diversion pipe 8.

[0064] In this embodiment: the high-pressure air pipe 28 is arranged at the upper end of the limiting slide groove 4, which is a diversion channel for the high-pressure airflow. A part of the high-pressure airflow flows out from the first nozzle 3, and the other part is diverted through the diversion pipe 8. When the opening of the second nozzle 11 is not blocked, it flows out from the second nozzle 11.

[0065] It should be noted that the driving motor 26 used in the present device is prior art and will not be described in detail here.

[0066] The working principle and use process of the present invention are as follows: the solution output pipe 7 is connected to the discharge port of the molten metal tank, the collecting cooling barrel 24 at the lower end is connected to the metal powder cooling and collecting device, and an atomized metal powder preparation device is arranged between the solution output pipe 7 and the collecting cooling barrel 24. When the metal solution flows out from the solution output pipe 7, it is crushed into fine droplets by the impact of high-pressure gas, and these droplets are subsequently cooled and solidified; when it is necessary to make a coarser metal powder, the outlet output directions of the multiple airflow output pipes 2 do not coincide with the center of the solution output pipe 7, thereby reducing the shear force of the metal solution when it is impacted by the high-pressure gas, so that the particles of the metal solution that are impacted and crushed are larger. When performing powder injection molding, larger particles have a lower cost. The invention discloses a novel method for preparing a metal powder having a small size and a small size. The invention discloses a ...

[0067] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A feeding material preparation device for metal powder injection molding, characterized in that: include: Fixed ring (1); A connecting plate (6), wherein the connecting plate (6) is fixedly connected to the upper end of the fixing ring (1); A solution output pipe (7), wherein the solution output pipe (7) is fixedly connected to the upper end of the connecting plate (6); Atomizing mechanism, wherein the atomizing mechanism is provided with a plurality of groups, each group of the atomizing mechanism comprises an airflow output pipe (2), a first nozzle (3), a limiting slide groove (4), a limiting slider (5), a flow divider (8), an outer expansion plate (9), an air receiving port (10) and a second nozzle (11), the airflow output pipe (2) being provided on the upper side of a fixing ring (1), the first nozzle (3) being provided at the output end of the airflow output pipe (2), the limiting slide groove (4) being provided at the lower end of the airflow output pipe (2), the limiting slider (5) being fixed The air inlet (10) is connected to the upper end of the fixed ring (1), the limit slide block (5) slides in the limit slide groove (4), the diverter pipe (8) is arranged at the lower end of the airflow output pipe (2), the outer expansion plate (9) is arranged on the lower side of the fixed ring (1), the air inlet (10) is opened at the upper end of the fixed ring (1), the lower end of the diverter pipe (8) is fixedly connected to the upper end of the air inlet (10), the second nozzle (11) is opened at one side end of the outer expansion plate (9), and the second nozzle (11) is connected to the air inlet (10).

2. A feeding material preparation device for metal powder injection molding according to claim 1, characterized in that: The output ports of the plurality of first nozzles (3) are inclined downward, and the openings of the plurality of second nozzles (11) are blocked by a plurality of external expansion plates (9) respectively.

3. A feeding material preparation device for metal powder injection molding according to claim 2, characterized in that: A rotating ring (12) is provided on the outer side of the fixed ring (1), the lower end of the rotating ring (12) is fixedly connected to a bottom plate (13), the upper end of the bottom plate (13) is provided with a gear ring (14), the lower end of the bottom plate (13) is fixedly connected to a supporting rotating ring (16), the lower end of the fixed ring (1) is provided with a supporting rotating groove (15), and the supporting rotating ring (16) rotates in the supporting rotating groove (15).

4. A feeding material preparation device for metal powder injection molding according to claim 3, characterized in that: A fixed shaft slot (17) is provided at the upper end of each of the outer expansion plates (9), and a movable shaft slot (18) is provided at the lower end of each of the outer expansion plates (9). A plurality of fixed shaft plug blocks (19) are fixedly connected to the circumferential inner wall of the fixed ring (1), and the lower ends of the plurality of fixed shaft plug blocks (19) respectively rotate in the plurality of fixed shaft slots (17). A plurality of movable shaft plug blocks (20) are fixedly connected to the lower end of the support rotating groove (15), and the plurality of movable shaft plug blocks (20) respectively rotate in the plurality of movable shaft slots (18).

5. A feeding material preparation device for metal powder injection molding according to claim 4, characterized in that: When the openings of the plurality of second nozzles (11) are opened, the output direction of the plurality of second nozzles (11) is the center of the solution output pipe (7).

6. A feeding material preparation device for metal powder injection molding according to claim 5, characterized in that: A plurality of connecting rotating blocks (22) are fixedly connected to the upper end of the rotating ring (12), a connecting rotating groove (21) is provided at one side end of each of the limiting sliding grooves (4), and the plurality of connecting rotating blocks (22) rotate in the plurality of connecting rotating grooves (21) respectively.

7. A feeding material preparation device for metal powder injection molding according to claim 6, characterized in that: The upper end of each air flow output pipe (2) is fixedly connected to an air connection pipe (23), and each air connection pipe (23) is connected to an external air pressure pump.

8. A feeding material preparation device for metal powder injection molding according to claim 7, characterized in that: A collecting cooling barrel (24) is provided on the lower side of the fixing ring (1); one side end of the collecting cooling barrel (24) is fixedly connected to a support seat (25); the upper end of the support seat (25) is fixedly connected to a driving motor (26); the output end of the driving motor (26) is fixedly connected to a gear (27); and the gear (27) is meshed with the gear ring (14).

9. A feeding material preparation device for metal powder injection molding according to claim 8, characterized in that: A high-pressure air pipe (28) is provided in each of the air flow output pipes (2), and the high-pressure air pipe (28) is respectively connected to the air connection pipe (23), the first nozzle (3) and the flow distribution pipe (8).

10. A method for preparing feedstock for metal powder injection molding according to claim 9, characterized in that: The steps include: S1, the solution output pipe (7) is connected to the discharge port of the molten metal tank, the collecting cooling barrel (24) at the lower end is connected to the metal powder cooling and collecting device, an atomized metal powder preparation device is provided between the solution output pipe (7) and the collecting cooling barrel (24), when the metal solution flows out from the solution output pipe (7), it is broken into fine droplets by the impact of high-pressure gas, and these droplets are then cooled and solidified to form; S2. When a coarser metal powder needs to be produced, the outlet directions of the plurality of gas flow output pipes (2) do not coincide with the center of the solution output pipe (7), thereby reducing the shear force of the metal solution when it is impacted by the high-pressure gas, so that the particles of the metal solution that are crushed by the impact are larger. When performing powder injection molding, larger particles have a lower cost, and the injection pressure can be reduced during the injection process, thereby reducing the equipment load. S3. When it is necessary to produce finer metal powder, the driving motor (26) drives the gear ring (14) to rotate clockwise at a small angle, thereby changing the gas outlet direction of the multiple first nozzles (3) so that the gas outlet direction of the multiple first nozzles (3) is the center of the solution output pipe (7), thereby increasing the shear force when the gas impacts the metal solution. While the gear ring (14) rotates, the second nozzle (11) at the lower end opens to form a secondary layer impact. The metal particles initially crushed by the first nozzle (3) can be crushed into fine metal powder after passing through the second impact airflow. During metal injection molding, it has better fluidity, which helps to fill complex mold cavities during the injection process and reduce the occurrence of defects.

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