Metal powder mixing and drying device

Abstract

The utility model discloses a kind of metal powder mixing drying device, specifically related to metal powder drying technical field, including outer cylinder, the lower end both sides of outer cylinder inner wall are provided with bottom plate, two the bottom plate side is provided with baffle ring, the baffle ring outer wall is connected with the both sides of outer cylinder inner wall, two the bottom plate upper end is provided with driving assembly, two the baffle ring inner wall slidingly connected with inner drying cylinder, the both ends of the inner drying cylinder are set as conical structure, the inner drying cylinder is located in the sliding of two baffle rings, the lower end middle part of outer cylinder is connected with discharge pipe, the middle part of outer cylinder one side is connected with feed pipe, the one end of feed pipe is sequentially penetrated outer cylinder and inner drying cylinder and extends to inner drying cylinder interior, the utility model is alternately injected high-temperature inert gas and the pulse drying mode of vacuum extraction, and combining the filtration recovery design of automatic dust removal, the depth uniform drying of superfine metal powder and continuous efficient production are realized.

Description

Technical Field

[0001] This utility model relates to the field of metal powder drying technology, and more specifically, to a metal powder mixing and drying device. Background Technology

[0002] In the fields of additive manufacturing, metal injection molding, and high-end powder metallurgy, active metal powders such as titanium alloys and aluminum alloys are widely used due to their excellent mechanical properties and lightweight characteristics. Because these powder particles are extremely fine and have a very large total surface area, their chemical properties are exceptionally active. During traditional hot air drying, they are prone to oxidation and nitriding, leading to a decrease in powder purity and a deterioration in flowability, ultimately severely affecting the performance of the molded parts. Therefore, when processing these high-value active metal powders, the industry generally requires drying under vacuum or inert atmosphere protection to completely isolate the interference of oxygen and moisture, ensuring the chemical purity and physical properties of the powder. The vacuum environment can not only effectively prevent oxidation but also significantly lower the boiling point of water, which is theoretically beneficial for rapid dehydration at low temperatures.

[0003] However, in actual production, it has been found that even drying ultrafine metal powders in a vacuum environment still faces severe challenges. Due to the fine particle size, the surface tension during the moisture removal process makes the powder particles easily agglomerate and stick to the walls, forming hard lumps that are difficult to break. To solve the agglomeration problem and enhance heat transfer, existing technologies often use mechanical stirring shafts or crushing blades inside the equipment. However, this method has drawbacks. Mechanical stirring creates dead zones in the cavity, and the stirring action is difficult to evenly cover all the powder, resulting in uneven and incomplete drying. The moisture in the core of the powder bed is difficult to be effectively discharged. Furthermore, the intense friction and impact between the stirring blades and the powder can easily introduce metal foreign matter contamination, change the original spherical morphology of the powder particles, and even cause thermal damage to heat-sensitive powders due to frictional heat generation, seriously impairing the quality of the final product. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a metal powder mixing and drying device.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A metal powder mixing and drying device includes an outer cylinder, with bottom plates provided on both sides of the lower end of the inner wall of the outer cylinder, and baffle rings provided on one side of each of the two bottom plates. The outer walls of the baffle rings are connected to both sides of the inner wall of the outer cylinder. A driving assembly is provided on the upper end of each of the two bottom plates. An inner drying cylinder is slidably connected to the inner walls of the two baffle rings. Both ends of the inner drying cylinder are tapered. The inner drying cylinder slides inside the two baffle rings. A discharge pipe is connected to the middle of the lower end of the outer cylinder.

[0007] A feed pipe is connected to the middle of one side of the outer cylinder. One end of the feed pipe passes through the outer cylinder and the inner drying cylinder in sequence and extends into the interior of the inner drying cylinder. An air intake mechanism is connected to one side of the upper end of the outer cylinder. The air intake mechanism is used to deliver high-temperature inert gas into the interior of the inner drying cylinder.

[0008] A vacuum mechanism is connected to the middle of one side of the inner drying cylinder, which is used to perform vacuuming treatment inside the inner drying cylinder.

[0009] Preferably, the drive assembly includes four sets of drive motors, with the lower ends of two drive motors connected to one upper side of one of the base plates, and the lower ends of the other two drive motors connected to the upper side of another base plate. The output ends of the multiple drive motors are provided with friction wheels. The upper ends of the two friction wheels on the left and the two friction wheels on the right are each provided with friction rings. The inner walls of the two friction rings are connected to both sides of the outer wall of the inner drying cylinder. The inner walls of the friction rings are inclined and their shape is adapted to the shape of both sides of the outer wall of the inner drying cylinder.

[0010] Preferably, a discharge pipe is connected to the middle of the lower end of the inner drying cylinder, and a discharge valve is connected to the outer wall of the discharge pipe. Drying baffles are circumferentially connected to the inner wall of the inner drying cylinder, and the shape of the drying baffles is adapted to the shape of the inner wall of the inner drying cylinder.

[0011] Preferably, the feed pipe is L-shaped, the lower end of the feed pipe is inclined, and the upper end of the feed pipe is trumpet-shaped.

[0012] Preferably, the air intake mechanism includes an air intake pipe, the lower end of which extends through into the interior of the outer cylinder, and the lower end of the air intake pipe is connected to a ring pipe. The ring pipe is sleeved on one side of the outer wall of the feed pipe, and air delivery pipes are connected to both sides of the upper part of the inner wall of the ring pipe.

[0013] Preferably, the lower ends of the plurality of gas supply pipes extend through into the inside of the feed pipe, the gas supply pipes are arranged in an L-shape, one end of the inner wall of the gas supply pipe is connected to a filter block, and one end of the gas supply pipe is arranged in a tapered shape.

[0014] Preferably, the vacuum mechanism includes an extraction pipe, one end of which is connected to one side of the inner drying cylinder. An outlet is provided on one side of the inner drying cylinder corresponding to the extraction pipe, and a screen block is connected to the outlet. A rotary joint is connected to one end of the extraction pipe, and a connecting pipe is connected to one end of the rotary joint. A collection box is connected to one end of the outer cylinder. One end of the connecting pipe passes through the outer cylinder and the collection box and extends into the inside of the collection box. A collection frame is slidably connected to the lower end of the inner wall of the collection box. Filter rings are connected to the upper parts of both sides of the inner wall of the collection box, and the lower ends of the filter rings are open.

[0015] Preferably, a cleaning motor is connected to one side of the collection box, the output end of the cleaning motor extends through into the inside of the collection box, the output end of the cleaning motor is located inside the filter ring, and scrapers are connected to the outer wall of the output end of the cleaning motor. One side of the multiple scrapers contacts the inner wall of the filter ring, and an exhaust pipe is connected to the middle of the upper end of the collection box.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] 1. The intermittent alternating working mode of high-temperature inert gas injection and vacuum suction efficiently transfers heat and carries away the surface moisture of metal powder in the hot nitrogen stage, and uses pressure drop to make the deep moisture of the powder boil and vaporize instantly and be forcibly extracted in the vacuum stage. This alternating working mode can effectively break the agglomeration of ultrafine powder caused by capillary action, and solve the problems of uneven heat and mass transfer and difficulty in removing core moisture in traditional heating or vacuum drying, thus achieving deep, uniform and rapid drying of powder.

[0018] 2. Through the collection box and filter ring, and through the cleaning motor-driven scraper for automatic dust removal, fine powder carried out by the airflow can be captured and recovered in real time, avoiding vacuum reduction and frequent shutdowns for cleaning caused by powder blockage, significantly improving equipment utilization, and reducing material loss and maintenance costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;

[0020] Figure 2 This is a schematic diagram of the connection structure between the inner drying cylinder and the retaining ring.

[0021] Figure 3 This is a schematic diagram of the connection structure between the outer cylinder, the bottom plate, and the retaining ring.

[0022] Figure 4 A schematic diagram showing the connection structure between the motor output and multiple scrapers;

[0023] Figure 5 This is a schematic diagram of the connection structure between the base plate, drive motor, friction wheel, and friction ring.

[0024] Figure 6 This is a schematic diagram of the installation structure of the drying partition;

[0025] Figure 7 This is a schematic diagram of the connection structure between the loop pipe and the gas transmission pipe.

[0026] Figure 8 This is a schematic diagram of the connection structure between multiple gas pipelines and ring pipes.

[0027] The attached diagram is labeled as follows: 1. Outer cylinder; 2. Base plate; 3. Retaining ring; 4. Drive motor; 5. Friction wheel; 6. Friction ring; 7. Inner drying cylinder; 8. Discharge pipe; 9. Feed pipe; 10. Air inlet pipe; 11. Ring pipe; 12. Air conveying pipe; 13. Filter block; 14. Drying partition; 15. Exhaust pipe; 16. Rotary joint; 17. Connecting pipe; 18. Collection box; 19. Collection frame; 20. Filter ring; 21. Cleaning motor; 22. Scraper; 23. Exhaust pipe; 24. Discharge pipe. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Refer to the instruction manual appendix Figures 1-8 As shown in the figure, a metal powder mixing and drying device according to an embodiment of the present invention includes an outer cylinder 1. A bottom plate 2 is provided on both sides of the lower end of the inner wall of the outer cylinder 1. A retaining ring 3 is provided on one side of each bottom plate 2. The outer wall of the retaining ring 3 is connected to both sides of the inner wall of the outer cylinder 1. A driving assembly is provided on the upper end of each bottom plate 2. An inner drying cylinder 7 is slidably connected to the inner wall of each retaining ring 3. Both ends of the inner drying cylinder 7 are conical. The inner drying cylinder 7 slides inside the two retaining rings 3. A discharge pipe 8 is connected to the middle of the lower end of the inner drying cylinder 7. A discharge valve is connected to the outer wall of the discharge pipe 8. Drying baffles 14 are circumferentially connected to the inner wall of the inner drying cylinder 7. The shape of the drying baffles 14 is similar to that of the inner drying cylinder 7. The inner wall of the drying cylinder 7 is adapted to the shape of the inner wall. The feed pipe 9 is L-shaped. A feed valve is connected to one side of the outer wall of the feed pipe 9. The lower end of the feed pipe 9 is inclined and the upper end is trumpet-shaped. A discharge pipe 24 is connected to the middle of the lower end of the outer cylinder 1. A feed pipe 9 is connected to the middle of one side of the outer cylinder 1. One end of the feed pipe 9 passes through the outer cylinder 1 and the inner drying cylinder 7 and extends into the inner drying cylinder 7. An air intake mechanism is connected to one side of the upper end of the outer cylinder 1. The air intake mechanism is used to deliver high-temperature inert gas into the inner drying cylinder 7. A vacuum mechanism is connected to the middle of one side of the inner drying cylinder 7. The vacuum mechanism is used to perform vacuum treatment inside the inner drying cylinder 7.

[0030] The outer cylinder 1 serves as the external protective and collection shell of the equipment. The bottom plate 2 is fixed on both sides of the lower end of its inner wall. The inner drying cylinder 7 is slidably connected to the two retaining rings 3, which ensures the concentricity and stable operation of the inner drying cylinder 7 during rotation. The conical structure at both ends of the inner drying cylinder 7 is conducive to the axial flow and aggregation of materials, and can realize the complete gravity flow of powder during unloading. The discharge valve is sealed and discharges the processed powder after the drying cycle is completed. When the inner drying cylinder 7 rotates, the drying baffle 14 continuously lifts the powder to a certain height and then sprinkles it down, forming a uniform "waterfall" material curtain, which greatly increases the contact area and frequency between the powder and the heat medium and the cylinder wall, and solves the problem of uneven drying and agglomeration caused by static accumulation.

[0031] The drive assembly is the core that provides the rotational power for the inner drying cylinder 7. The feed valve is used to control the input and sealing of materials. The lower end of the feed pipe 9 is inclined to guide the material to flow smoothly and prevent accumulation and blockage. Its upper end is flared to facilitate the reception of external feeding equipment, expand the receiving range, and improve the loading efficiency. The feed pipe 9 forms a closed conveying channel from the outside to the inner drying cylinder 7.

[0032] The air intake mechanism safely and evenly delivers the high-temperature, dry, inert gas prepared externally into the inner drying cylinder 7, which is the key to achieving convective heating and atmosphere protection. The vacuum mechanism is used to evacuate the inside of the inner drying cylinder 7, which on the one hand creates a low-pressure environment to lower the boiling point of water and enhance dehydration; on the other hand, it works with the air intake mechanism to form a pulse drying force with alternating pressure, which breaks the capillary force of water and prevents powder from agglomerating.

[0033] The drive assembly includes four sets of drive motors 4. Two of the drive motors 4 are connected to one side of the upper end of one of the base plates 2 at their lower ends, and the other two drive motors 4 are connected to the upper end of the other base plate 2 at their lower ends. Friction wheels 5 are provided at the output ends of the multiple drive motors 4. Friction rings 6 are provided on the upper ends of the two friction wheels 5 on the left and the two friction wheels 5 on the right. The inner walls of the two friction rings 6 are connected to the two sides of the outer wall of the inner drying cylinder 7. The inner walls of the friction rings 6 are inclined and the shape of the inner walls of the friction rings 6 is adapted to the shape of the two sides of the outer wall of the inner drying cylinder 7.

[0034] Four sets of drive motors 4 ensure the balance and uniformity of driving force. The friction wheel 5 is covered with a special material with a high coefficient of friction and wear resistance. The four friction wheels 5 contact the friction ring 6 from both sides below, and the power transmission is smooth.

[0035] The air intake mechanism includes an air intake pipe 10. The upper end of the air intake pipe 10 is connected to the output end of an external inert gas device. The lower end of the air intake pipe 10 extends through the interior of the outer cylinder 1. The lower end of the air intake pipe 10 is connected to a ring pipe 11. The ring pipe 11 is sleeved on one side of the outer wall of the feed pipe 9. Both sides of the upper part of the inner wall of the ring pipe 11 are connected to air delivery pipes 12. The lower ends of multiple air delivery pipes 12 extend through the interior of the feed pipe 9. The air delivery pipes 12 are L-shaped. One end of the inner wall of the air delivery pipe 12 is connected to a filter block 13. One end of the air delivery pipe 12 is tapered.

[0036] The air inlet pipe 10 can deliver high-temperature inert gas into the ring pipe 1. The ring pipe 11 is sleeved on the outside of the feed pipe 9, which supports it and lays the foundation for subsequent uniform gas distribution. Multiple air delivery pipes 12 allow high-temperature inert gas to be sprayed out from the side wall of the feed pipe 9 and evenly delivered to the powder tumbling inside the inner drying cylinder 7, avoiding uneven temperature and airflow distribution caused by single-point air intake. The filter block 13 prevents the powder tumbling inside the inner drying cylinder 7 from flowing back into the air delivery pipe 12 when vacuuming or pressure fluctuations occur, thereby avoiding pipeline blockage and contamination.

[0037] The vacuum mechanism includes an extraction pipe 15, one end of which is connected to one side of the inner drying cylinder 7. An outlet is located on one side of the inner drying cylinder 7 corresponding to the extraction pipe 15, and a screen block is connected to the outlet. A rotary joint 16 is connected to one end of the extraction pipe 15, and a connecting pipe 17 is connected to one end of the rotary joint 16. A collection box 18 is connected to one end of the outer cylinder 1. One end of the connecting pipe 17 passes through the outer cylinder 1 and the collection box 18, extending into the interior of the collection box 18. A collection frame 19 is slidably connected to the lower end of the inner wall of the collection box 18. Filter rings 20 are connected to the upper part of both sides of the inner wall of the collection box 18. The lower end of the filter rings 20 is open. A cleaning motor 21 is connected to one side of the collection box 18. The output end of the cleaning motor 21 extends through the inside of the collection box 18. The output end of the cleaning motor 21 is located inside the filter rings 20. Scrapers 22 are connected to the outer wall of the output end of the cleaning motor 21. One side of the multiple scrapers 22 contacts the inner wall of the filter rings 20. An exhaust pipe 23 is connected to the middle of the upper end of the collection box 18. One end of the exhaust pipe 23 is connected to the input end of the vacuum pump.

[0038] The sieve block on one side of the exhaust pipe 15 allows gas and water vapor to pass freely, while effectively blocking most solid powder particles. The rotary joint 16 solves the problem of dynamic sealing connection between the rotating inner drying cylinder 7 and the connecting pipe 17, ensuring that the inner drying cylinder 7 can rotate freely under high vacuum conditions. The filter ring 20 can further capture the ultrafine powder that penetrates the sieve block, ensuring the cleanliness of the discharged gas. The intercepted powder accumulates on the inner wall of the filter ring 20. The cleaning motor 21 can be started to drive the scraper 22 to rotate and scrape off the powder layer attached to the inner wall of the filter ring 20, realizing automatic online dust removal. The scraped powder falls into the collection frame 19 with a sliding connection at the bottom.

[0039] It should be noted that the power supply, driving and control methods of the drive motor 4, rotary motor 21, vacuum pump and various valves and other power and execution components described in this utility model are all conventional technical means used in the field to realize the function of the equipment and belong to the scope of existing technology. Therefore, their specific circuit connection and control program will not be described in detail in this article.

[0040] Working principle: During use, the metal powder slurry or wet powder to be dried is injected into the inner drying cylinder 7 through the funnel-shaped feed pipe 9. After the material is loaded, the feed pipe valve is closed. The outer walls of the inner drying cylinder 7 are positioned by the retaining rings 3 on both sides, and radial constraint is achieved by the friction wheel 5 of the drive assembly pressing the friction ring 6. The four drive motors 4 start at the same time, driving the friction wheel 5 to rotate. The friction wheel 5 drives the inner drying cylinder 7 to rotate slowly and smoothly around its axis through the friction force with the friction ring 6. The drying baffles 14 distributed circumferentially on the inner wall of the inner drying cylinder 7 rotate with the cylinder, continuously picking up and scattering the powder, realizing the dynamic turning of the material.

[0041] The high-temperature inert gas generated by the external high-temperature inert gas equipment enters the ring pipe 11 through the inlet pipe 10, and then is evenly dispersed through multiple gas delivery pipes 12. It is sprayed into the rotating inner drying cylinder 7 from the side wall of the feed pipe 9. The hot nitrogen directly penetrates the tumbling powder, rapidly and evenly heating it through convection, and carrying away some surface moisture.

[0042] Then the air intake is shut off, the vacuum mechanism is activated, and the external vacuum pump evacuates the interior of the inner drying cylinder 7 through the exhaust pipe 23. Under the action of pressure difference, the gas in the inner drying cylinder 7 enters the exhaust pipe 15 through the air outlet with screen block. The screen block prevents the powder in the inner drying cylinder 7 from being discharged. The gas enters the collection box 18 through the rotary joint 16 and the connecting pipe 17. The continuous suction of the vacuum pump causes the pressure in the inner drying cylinder 7 to drop sharply. Under vacuum, the boiling point of the deep moisture in the metal powder decreases, and it boils and vaporizes violently. It is then forcefully extracted along with the residual hot and humid nitrogen from the previous stage.

[0043] By using hot nitrogen pressurization and vacuum pumping to create a drying pulse, and performing multiple cycles, pulse drying is formed, which effectively prevents powder agglomeration and achieves deep dehydration.

[0044] The extracted airflow contains water vapor and a small amount of extremely fine powder. After entering the collection box 18, the airflow first impacts the box wall and slows down. Then it is filtered through the filter ring 20. The filter ring 20 intercepts most of the solid powder inside, while the clean gas passes through the filter ring 20 and is finally discharged by the vacuum pump through the exhaust pipe 23. When cleaning is required, the cleaning motor 21 can be started to drive the scraper 22 to rotate, scraping off the powder adhering to the inner wall of the filter ring 20 and dropping it into the collection frame 19 below, thus realizing the recovery of powder.

[0045] After drying is completed, the discharge valve on the discharge pipe 8 is opened. The dried powder is completely discharged into the outer cylinder 1 through the discharge pipe 8 under the guidance of gravity and the conical structure of the inner drying cylinder 7. It can be discharged into the outer cylinder 1 through the discharge pipe 24 at the bottom of the outer cylinder 1.

[0046] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0047] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0048] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A metal powder mixing and drying apparatus, comprising an outer cylinder (1), characterized in that: The lower end of the inner wall of the outer cylinder (1) is provided with a bottom plate (2) on both sides. A retaining ring (3) is provided on one side of each of the two bottom plates (2). The outer wall of the retaining ring (3) is connected to both sides of the inner wall of the outer cylinder (1). A driving component is provided at the upper end of each of the two bottom plates (2). An inner drying cylinder (7) is slidably connected to the inner wall of each of the two retaining rings (3). Both ends of the inner drying cylinder (7) are set with a conical structure. The inner drying cylinder (7) slides inside the two retaining rings (3). A discharge pipe (24) is connected to the middle of the lower end of the outer cylinder (1). A feed pipe (9) is connected to the middle of one side of the outer cylinder (1). One end of the feed pipe (9) passes through the outer cylinder (1) and the inner drying cylinder (7) in sequence and extends into the interior of the inner drying cylinder (7). An air intake mechanism is connected to one side of the upper end of the outer cylinder (1). The air intake mechanism is used to deliver high-temperature inert gas into the interior of the inner drying cylinder (7). A vacuum mechanism is connected to the middle of one side of the inner drying cylinder (7), which is used to perform vacuuming treatment inside the inner drying cylinder (7).

2. The metal powder mixing and drying apparatus according to claim 1, characterized in that: The drive assembly includes drive motors (4), and there are four sets of drive motors (4). The lower ends of two drive motors (4) are connected to one side of the upper end of one of the base plates (2), and the lower ends of the other two drive motors (4) are connected to the upper end of another base plate (2). The output ends of the multiple drive motors (4) are provided with friction wheels (5). The upper ends of the two friction wheels (5) on the left and the two friction wheels (5) on the right are both provided with friction rings (6). The inner walls of the two friction rings (6) are connected to both sides of the outer wall of the inner drying cylinder (7). The inner wall of the friction rings (6) is inclined and the shape of the inner wall of the friction rings (6) is adapted to the shape of both sides of the outer wall of the inner drying cylinder (7).

3. The metal powder mixing and drying apparatus according to claim 1, characterized in that: The inner drying cylinder (7) is connected to the middle of the lower end of the discharge pipe (8), and the outer wall of the discharge pipe (8) is connected to the discharge valve. The inner wall of the inner drying cylinder (7) is circumferentially connected to the drying partition (14), and the shape of the drying partition (14) is adapted to the shape of the inner wall of the inner drying cylinder (7).

4. The metal powder mixing and drying apparatus according to claim 1, characterized in that: The feed pipe (9) is L-shaped, the lower end of the feed pipe (9) is inclined, and the upper end of the feed pipe (9) is trumpet-shaped.

5. A metal powder mixing and drying apparatus according to claim 4, characterized in that: The air intake mechanism includes an air intake pipe (10), the lower end of which extends through into the interior of the outer cylinder (1). The lower end of the air intake pipe (10) is connected to a ring pipe (11), which is sleeved on one side of the outer wall of the feed pipe (9). Both sides of the upper part of the inner wall of the ring pipe (11) are connected to air delivery pipes (12).

6. The metal powder mixing and drying apparatus according to claim 5, characterized in that: The lower ends of the multiple gas delivery pipes (12) extend through the inside of the feed pipe (9). The gas delivery pipes (12) are arranged in an L-shaped structure. One end of the inner wall of the gas delivery pipe (12) is connected to a filter block (13). One end of the gas delivery pipe (12) is arranged in a conical structure.

7. A metal powder mixing and drying apparatus according to claim 1, characterized in that: The vacuum mechanism includes an air extraction pipe (15), one end of which is connected to one side of the inner drying cylinder (7). An air outlet is provided on one side of the inner drying cylinder (7) corresponding to the air extraction pipe (15). A screen block is connected to the air outlet. A rotary joint (16) is connected to one end of the air extraction pipe (15). A connecting pipe (17) is connected to one end of the rotary joint (16). A collection box (18) is connected to one end of the outer cylinder (1). One end of the connecting pipe (17) passes through the outer cylinder (1) and the collection box (18) in sequence and extends into the inside of the collection box (18). A collection frame (19) is slidably connected to the lower end of the inner wall of the collection box (18). Filter rings (20) are connected to the upper part of both sides of the inner wall of the collection box (18). The lower end of the filter rings (20) is open.

8. A metal powder mixing and drying apparatus according to claim 7, characterized in that: A cleaning motor (21) is connected to one side of the collection box (18). The output end of the cleaning motor (21) extends through into the inside of the collection box (18). The output end of the cleaning motor (21) is located inside the filter ring (20). Scrapers (22) are connected to the outer wall of the output end of the cleaning motor (21). One side of the multiple scrapers (22) contacts the inner wall of the filter ring (20). An exhaust pipe (23) is connected to the middle of the upper end of the collection box (18).

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