A mixing device based on metal powder 3D printing

Abstract

The application relates to a mixing device based on metal powder 3D printing, which comprises a left stirring shell arranged in a semicircular shell structure, a discharge pipe rotationally connected to the side of the left stirring shell, a fixed base arranged in a fixedly connected base at the center position of the fixed base, a fixed frame arranged on the top side of the fixed base, a discharge pipe penetrating through and fixedly connected to the center position of the fixed base, the side of the left stirring shell rotationally connected to the side of the discharge pipe, a heating ring fixedly connected to the inner wall side of the left stirring shell, a stirring pool communicated with the side of the conical pipe, a driven gear ring sleeved and fixedly connected to the side of the stirring pool, a driving shaft of a motor fixedly connected to the side of the driving gear, the bottom of the motor fixedly connected to the top of the fixed base, the side of the stirring pool rotationally connected to the side of the discharge pipe, and the side of the conical pipe communicated with the side of a feeding pipe.

Description

Technical Field

[0001] This invention relates to the field of mixing device technology, specifically a mixing device based on 3D printing of metal powder. Background Technology

[0002] Metal 3D printing technologies, such as laser bed fusion (LPBF) and direct energy deposition (DED), can create complex structures with near-net-shape properties and are widely used in aerospace, medical, and mold-making fields. The starting point and core of these processes is the metal powder raw material, the quality of which directly determines the performance of the final part. Traditional metal powder mixing methods mainly follow two paths: Offline premixing: Before printing, metal powders of different compositions or particle sizes are batch-mixed using equipment such as ball mills, V-type mixers, or three-dimensional motion mixers. This method is independent of the printer; the mixed powder is then fed into the powder cylinder of the printing equipment. Slurry supply: Metal powder is mixed with liquid organic matter or binders to form a slurry, which is then printed using a slurry supply system. This method avoids expensive components such as lasers and expands the range of printable materials. With the deepening of materials research and the emergence of demand for functionally graded materials (FGM), higher requirements are placed on mixing devices: they not only need to be uniformly mixed but also able to flexibly and precisely control the composition, and even achieve "on-demand mixing."

[0003] CN117862540A discloses a mixing device for 3D printing of metal powder, which drives several electromagnetic heating plates to rotate and heat the metal powder dragged in from the top, and works in conjunction with two sets of heating tubes to heat the internal metal powder evenly, thereby improving the printing quality. The heating box can maintain the internal temperature. Summary of the Invention

[0004] To address the problem that existing technologies suffer from differences in particle size, density, and sphericity among different metal powders, which can easily lead to powder segregation (such as the aggregation of microspheres) during the mixing, transportation, storage, or spreading process due to vibration or gravity, resulting in discrepancies between the local composition of the printed parts and the design values, and even causing cracks, the present invention provides the following technical solution: a mixing device for 3D printing based on metal powder, comprising: a left stirring shell, wherein the left stirring shell is configured as a semi-circular shell structure, and a discharge pipe is rotatably connected to the side of the left stirring shell; A fixed base is provided, with a fixed connection at its center. A fixed frame is provided on the top side of the fixed base. A discharge pipe is passed through and fixedly connected to the center of the fixed base. The side of the left stirring shell is rotatably connected to the side of the discharge pipe. A heating coil is fixedly connected to the inner wall side of the left stirring shell. A right stirring shell is rotatably connected to the side of the discharge pipe away from the left stirring shell. A feed pipe is connected to the side of the right stirring shell and is rotatably connected to the top of the fixed base. The right stirring shell includes a conical tube, the side of which is connected to a stirring tank. A driven gear ring is sleeved and fixedly connected to the side of the stirring tank. A limit groove is formed on the side of the driven gear ring. A drive gear meshes with the side of the driven gear ring. A drive shaft of a motor is fixedly connected to the side of the drive gear. The bottom of the motor is fixedly connected to the top of the fixed base. The side of the stirring tank is rotatably connected to the side of the discharge pipe. The side of the conical tube is connected to the side of the feed pipe.

[0005] Preferably, the mixing tank includes a mixing tank, a limiting ring is sleeved and fixedly connected to the side of the mixing tank, a stirring blade is fixedly connected to the inner wall of the mixing tank, the side of the mixing tank communicates with the side of the conical tube, the mixing tank is rotatably connected to the top of the fixed base through the limiting ring, the side of the mixing tank is rotatably connected to the side of the discharge pipe, the metal powder is introduced through the feed pipe and enters the interior of the left and right mixing shells for mixing and stirring, the fixed base is set to rotate and fix the left and right mixing shells, and the heating coil is set to control the temperature between the left and right mixing shells.

[0006] This design maintains a certain temperature during gas injection, preventing temperature changes during discharge from affecting printing accuracy. The discharge pipe is used to export the mixed raw material. After the raw material is introduced through the feed pipe, the metal powder enters between the left mixing shell and the conical tube, and then enters the mixing tank. The motor is started, and the motor's drive shaft drives the drive gear to rotate. The rotation of the drive gear drives the driven gear ring to rotate. The limiting groove is designed to keep the drive gear and the driven gear ring in a meshing state, thus facilitating the rotation of the mixing tank.

[0007] The limiting ring helps to restrict the rotation trajectory of the mixing tank. The rotation of the mixing tank drives the stirring blades to move, which in turn moves the metal powder. The stirring blades guide the metal powder away from the discharge pipe, and the same stirring process is carried out through the left stirring shell, thus mixing different metal powders. After the mixing is completed, the mixing tank and the left stirring shell are reversed, so that the stirring blades carry the metal powder towards the discharge pipe, which facilitates the spraying of the mixed metal powder under air pressure, thus facilitating the discharge of the mixed material.

[0008] Preferably, the feed pipe includes a feeding pipe, a rotating ring is sleeved and fixedly connected to one side end of the feeding pipe, a dispersing blade is rotatably connected to the inner wall of the feeding pipe via a bracket, an air inlet connector is connected to the end of the feeding pipe away from the rotating ring, a sealing assembly is connected to the top of the feeding pipe, a movable end of a first telescopic rod is fixedly connected to the top of the sealing assembly, the side of the feeding pipe is rotatably connected to the side of the tapered pipe, and the rotating ring is disposed inside the tapered pipe.

[0009] Preferably, the dispersing blade includes a rotating shaft, a guide blade is fixedly connected to the side of the rotating shaft, an air guide blade is fixedly connected to the side of the guide blade, an air vent is provided on the inner wall of the air guide blade, the rotating shaft is rotatably connected to the inner wall of the feeding pipe through a bracket, the guide blade is located on the side of the air inlet connector, and the guide blade is located below the sealing assembly.

[0010] Preferably, the sealing assembly includes a sealing piston, a spring rod is fixedly connected to the top of the sealing piston, a limit tube is sleeved and fixedly connected to the top of the spring rod, a stop ring adapted to the sealing piston is fixedly connected to the inner wall of the feeding pipe, and the top of the spring rod is fixedly connected to the movable end of the first telescopic rod. When the first telescopic rod is activated, the movable end of the first telescopic rod drives the sealing assembly to move, the movable end of the first telescopic rod drives the spring rod to move, and the movement of the spring rod drives the sealing piston to move, allowing the raw material to be introduced through the feed inlet on the side of the feeding pipe.

[0011] The limiting tube is used to limit the position of the spring rod during feeding, thereby facilitating the long-term introduction of raw materials. After the raw material descends to the inner wall of the feeding pipe, it is connected to the air inlet connector. The air inlet connector allows external gas to enter the interior of the feeding pipe. The gas carries the metal powder along the interior of the feeding pipe and into the interior of the mixing tank. At the same time as the gas flows, it drives the dispersing blades to rotate. The guide blades come into contact with the gas and drive the guide blades to rotate. The guide blades rotate on the rotating shaft.

[0012] The rotation of the guide vane drives the air guide vane to rotate, which in turn drives the air vent to rotate and guides the air to flow along the side of the guide vane. When the movable end of the first telescopic rod drives the spring rod to descend, the descending spring rod causes the sealing piston to engage with the stop ring. The gas flow then pneumatically cleans the metal powder below the sealing piston, facilitating the metal powder to enter the mixing tank for mixing. The spring rod and the first telescopic rod seal the inlet, maintaining a certain air pressure inside the mixing tank and the left stirring shell, thus facilitating the spraying out of the mixed metal powder under pneumatic action.

[0013] Preferably, the discharge pipe includes a limiting inner ring, a limiting outer ring is sleeved and fixedly connected to the side of the limiting inner ring, a connecting pipe is connected to the bottom of the limiting inner ring, a delivery pipe is connected to the side of the connecting pipe, a fixed end of a second telescopic rod is fixedly connected to the bottom of the connecting pipe, a sealing block is fixedly connected to the movable end of the second telescopic rod, the sealing block is disposed inside the connecting pipe, the side of the limiting inner ring is rotatably connected to the side of the left stirring shell, the side of the limiting inner ring away from the left stirring shell is rotatably connected to the side of the mixing tank, and the limiting outer ring is disposed on the side of the mixing tank and rotatably connected to the mixing tank.

[0014] Preferably, the heating ring includes a left electrode, a right electrode is fixedly connected to the side of the left electrode, an external electric ring is fixedly connected to the side of the left electrode, an internal electric ring is fixedly connected to the side of the right electrode, a heating ring is fixedly connected to the end of the left electrode away from the external electric ring, the left electrode passes through the side of the left stirring shell and is rotatably connected to the side of the left stirring shell, and the heating ring is located at the center of the limiting outer ring.

[0015] The gas mixed with metal powder enters the interior of the connecting pipe and is sprayed out along the delivery pipe. The inner limiting ring is rotatably connected to the side of the left stirring shell and the mixing tank. The outer limiting ring facilitates the rotatable connection between the left stirring shell and the mixing tank. During stirring and mixing, the movable end of the second telescopic rod drives the sealing block to seal the connecting pipe. After stirring is completed, the movable end of the second telescopic rod drives the sealing block to descend. The descending sealing block releases the gas at the discharge port of the connecting pipe, allowing the high-pressure gas to enter the interior of the delivery pipe along the connecting pipe for discharge.

[0016] The external and internal electric rings facilitate circuit connection to the heating ring. The left and right electrodes allow the heating ring to heat the inside of the raw material. As the rotating shaft rotates, it drives the side of the left electrode to rotate, which in turn drives the heating ring to rotate. The rotation of the heating ring heats the center of the metal powder raw material, thus ensuring that the metal powder remains at a high temperature when it is ejected. This avoids the temperature drop caused by material discharge, which would affect printing accuracy and thus helps to improve printing accuracy.

[0017] The beneficial effects of the technical solution provided by this invention include: 1. After being introduced through the feed pipe, the metal powder enters the left and right stirring shells for mixing and agitation. A heating coil between the left and right stirring shells provides temperature control, ensuring a stable powder temperature during gas injection and preventing adverse effects on printing accuracy due to temperature fluctuations during discharge. The mixed material is then discharged through the discharge pipe.

[0018] 2. After the raw materials are introduced into the feed pipe, the metal powder enters between the left stirring shell and the conical tube and flows into the mixing tank. After the motor starts, the drive shaft drives the drive gear to rotate, which in turn drives the driven gear ring to rotate. The mixing tank rotates accordingly, and the limiting groove ensures stable gear engagement, allowing the mixing tank to rotate smoothly. The limiting ring restricts the rotation trajectory of the mixing tank. As the mixing tank rotates, it drives the stirring blades to move, guiding the metal powder away from the discharge pipe and completing the mixing process. The left stirring shell participates in the mixing process simultaneously, ensuring thorough mixing of different metal powders. After mixing is complete, the mixing tank and the left stirring shell rotate in opposite directions, and the stirring blades guide the metal powder towards the discharge pipe, facilitating subsequent ejection under air pressure.

[0019] 3. After the first telescopic rod is activated, its movable end drives the sealing assembly to move, which in turn drives the spring rod to move, and the spring rod in turn drives the sealing piston to move. The raw material is introduced through the feed inlet on the side of the feeding pipe. The limiting tube restricts the position of the spring rod during the feeding process, which facilitates the continuous introduction of raw material. After the raw material enters the inner wall of the feeding pipe, the air inlet connector connects to external gas. The gas enters the inside of the feeding pipe and drives the metal powder to move along the feeding pipe into the mixing tank. During the gas flow, the dispersing blades rotate, and the guide blades rotate after contacting the gas. The rotating shaft drives the air guide blades to rotate, and the vent holes on the air guide blades guide the airflow, causing the air to flow along the side of the guide blades. When the first telescopic rod drives the spring rod to descend and the sealing piston contacts the stop ring, the airflow clears the metal powder below the sealing piston, allowing the powder to smoothly enter the mixing tank for mixing. At the same time, the spring rod and the first telescopic rod cooperate to seal the feed inlet, maintaining a stable air pressure inside the mixing tank and the left stirring shell, which facilitates the spraying out of the mixed powder under the action of air pressure.

[0020] 4. After the gas and metal powder are mixed, they enter the connecting pipe and are ejected outwards along the delivery pipe. The inner and outer limiting rings respectively cooperate with the left stirring shell and the side of the mixing tank, ensuring a stable connection between them during rotation and stirring. The movable end of the second telescopic rod drives the sealing block to seal the connecting pipe; after stirring is completed, the sealing block descends under the action of the second telescopic rod, releasing the discharge port of the connecting pipe, and the high-pressure gas enters the delivery pipe along the connecting pipe to achieve unloading. The external and internal electric rings cooperate to connect the heating ring in a circuit, and the left and right electrodes heat the inside of the raw material through the heating ring; when the rotating shaft rotates, it drives the side of the left electrode to rotate, causing the heating ring to rotate accordingly, uniformly heating the central area of ​​the metal powder raw material, ensuring that the powder maintains a high temperature when ejected, and avoiding the impact of temperature drop on printing accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the mixing device based on 3D printing of metal powder according to the present invention. Figure 2This is a schematic diagram of the right stirring shell structure of the present invention; Figure 3 This is a schematic diagram of the mixing tank structure of the present invention; Figure 4 This is a schematic diagram of the feed pipe structure of the present invention; Figure 5 This is a schematic diagram of the dispersion blade structure of the present invention; Figure 6 This is a schematic diagram of the sealing assembly structure of the present invention; Figure 7 This is a schematic diagram of the discharge pipe structure of the present invention; Figure 8 This is a schematic diagram of the heating coil structure of the present invention.

[0022] In the diagram: 1. Fixed base; 2. Left stirring shell; 3. Right stirring shell; 4. Feed pipe; 5. Discharge pipe; 6. Heating coil; 301. Conical tube; 302. Driven gear ring; 303. Limiting groove; 304. Mixing tank; 305. Drive gear; 306. Motor; 3041. Mixing tank; 3042. Limiting ring; 3043. Stirring blades; 401. Feeding pipe; 402. Rotating ring; 403. Dispersing blades; 404. Air inlet connector; 405. Sealing assembly; 406. First telescopic... Rod; 4031, Rotating shaft; 4032, Guide vane; 4033, Air guide vane; 4034, Vent hole; 4051, Sealing piston; 4052, Spring rod; 4053, Limiting tube; 4054, Stop ring; 501, Inner limiting ring; 502, Outer limiting ring; 503, Connecting tube; 504, Delivery tube; 505, Second telescopic rod; 506, Sealing block; 601, Left electrode; 602, Right electrode; 603, External electric ring; 604, Internal electric ring; 605, Heating ring. Detailed Implementation

[0023] Example 1, please refer to Figures 1-3This invention provides a technical solution: a mixing device for 3D printing of metal powder. Metal powder is introduced through a feed pipe 4 and enters the interior of the left mixing shell 2 and the right mixing shell 3 for mixing and stirring. A fixed base 1 is provided to rotate and fix the left and right mixing shells 2 and 3. A heating coil 6 is provided to control the temperature between the left and right mixing shells 2 and 3, thereby maintaining a certain temperature during gas injection to avoid temperature changes affecting printing accuracy during discharge. An discharge pipe 5 is provided to discharge the mixed material. After the material is introduced through the feed pipe 4, the metal powder enters between the left mixing shell 2 and the conical tube 301, and then enters the interior of the mixing tank 304. The motor 306 is started, and the drive shaft of the motor 306 drives the drive gear 305 to rotate. The rotation of the drive gear 305 drives the driven gear ring 302 to rotate. The limiting groove 3... The 03 setting facilitates the engagement of the driving gear 305 and the driven gear ring 302, thereby facilitating the rotation of the mixing tank 3041. The setting of the limiting ring 3042 facilitates the restriction of the rotation trajectory of the mixing tank 3041. The rotation of the mixing tank 3041 drives the stirring blade 3043 to move, which in turn drives the metal powder to move. Through the guiding action of the stirring blade 3043, the metal powder is stirred in a direction away from the discharge pipe 5, and the same stirring process is carried out through the left stirring shell 2, thereby mixing different metal powders. After the stirring is completed, the mixing tank 3041 and the left stirring shell 2 are driven in the opposite direction, so that the stirring blade 3043 drives the metal powder to stir in the direction of the discharge pipe 5, thereby facilitating the spraying of the mixed metal powder under air pressure, thus facilitating the discharge of the mixed material.

[0024] Example 2, please refer to Figures 1-6Based on the first embodiment, the first telescopic rod 406 is activated. The movable end of the first telescopic rod 406 drives the sealing assembly 405 to move. The movable end of the first telescopic rod 406 drives the spring rod 4052 to move. The movement of the spring rod 4052 drives the sealing piston 4051 to move. The raw material is introduced through the feed port on the side of the feeding pipe 401. The limiting tube 4053 is used to limit the position of the spring rod 4052 during feeding, thereby facilitating long-term raw material introduction. After the raw material descends to the inner wall of the feeding pipe 401, it is connected to the air inlet connector 404. The air inlet connector 404 connects to external gas entering the interior of the feeding pipe 401. The gas carries the metal powder along the interior of the feeding pipe 401 and into the interior of the mixing tank 3041. While the gas flows, it drives the dispersing blade 403 to rotate. The guide blade 4032 contacts the gas and drives the guide blade 4032 to rotate. 032 As the rotating shaft 4031 rotates, the guide vane 4032 rotates, driving the air guide vane 4033 to rotate. The air guide vane 4033 rotates, driving the vent 4034 to rotate and guiding the air to flow along the side of the guide vane 4032. When the movable end of the first telescopic rod 406 drives the spring rod 4052 to descend, the descending spring rod 4052 drives the sealing piston 4051 to engage with the stop ring 4054. The gas flow pneumatically cleans the metal powder below the sealing piston 4051. The rotating ring 402 restricts the rotation position of the feeding pipe 401, thereby facilitating the metal powder to enter the mixing tank 3041 for mixing. The spring rod 4052 and the first telescopic rod 406 seal the inlet, thereby maintaining a certain air pressure inside the mixing tank 3041 and the left stirring shell 2, so that the metal powder can be sprayed out under the action of pneumatic force after mixing.

[0025] Example 3, please refer to Figures 1-8Based on the second embodiment, the gas mixed with metal powder enters the interior of the connecting pipe 503 and is ejected along the delivery pipe 504. The limiting inner ring 501 is rotatably connected to the side of the left stirring shell 2 and the mixing tank 3041. The limiting outer ring 502 facilitates the rotatable connection between the left stirring shell 2 and the mixing tank 3041. During stirring and mixing, the movable end of the second telescopic rod 505 drives the sealing block 506 to seal the connecting pipe 503. After stirring is completed, the movable end of the second telescopic rod 505 drives the sealing block 506 to descend, and the descending sealing block 506 releases the discharge port of the connecting pipe 503, thereby releasing the high-pressure gas. The material enters the feed tube 504 through the connecting tube 503 for unloading. The external and internal electric rings 603 and 604 facilitate the circuit connection of the heating ring 605. The left electrode 601 and right electrode 602 facilitate the heating ring 605 to heat the inside of the material. When the rotating shaft 4031 rotates, it drives the side of the left electrode 601 to rotate, thereby driving the heating ring 605 to rotate. The rotation of the heating ring 605 heats the center of the metal powder material, thereby ensuring that the metal powder is kept at a high temperature when it is ejected, thus avoiding the temperature drop caused by material discharge and affecting the printing accuracy, thereby helping to improve the printing accuracy.

[0026] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of protection of the technical solution.

Claims

1. A mixing device based on metal powder 3D printing, characterized in that, include: The left stirring shell (2) is configured as a semi-circular shell structure, and the side of the left stirring shell (2) is rotatably connected to the discharge pipe (5). A fixed base (1) is provided with a fixed connection at its center. A fixed frame is provided on the top side of the fixed base (1). A discharge pipe (5) is connected through and fixedly connected to the center of the fixed base (1). The side of the left stirring shell (2) is rotatably connected to the side of the discharge pipe (5). A heating coil (6) is fixedly connected to the inner wall side of the left stirring shell (2). A right stirring shell (3) is rotatably connected to the side of the discharge pipe (5) away from the left stirring shell (2). A feed pipe (4) is connected to the side of the right stirring shell (3). The feed pipe (4) is rotatably connected to the top of the fixed base (1). The right stirring shell (3) includes a conical tube (301), the side of the conical tube (301) is connected to a stirring tank (304), the side of the stirring tank (304) is fitted with and fixedly connected to a driven gear ring (302), the side of the driven gear ring (302) has a limiting groove (303), the side of the driven gear ring (302) is meshed with a drive gear (305), the side of the drive gear (305) is fixedly connected to the drive shaft of a motor (306), the bottom of the motor (306) is fixedly connected to the top of the fixed base (1), the side of the stirring tank (304) is rotatably connected to the side of the discharge pipe (5), and the side of the conical tube (301) is connected to the side of the feed pipe (4). The mixing tank (304) includes a mixing tank (3041), a limiting ring (3042) is sleeved and fixedly connected to the side of the mixing tank (3041), a stirring blade (3043) is fixedly connected to the inner wall of the mixing tank (3041), the side of the mixing tank (3041) is connected to the side of the conical tube (301), the mixing tank (3041) is rotatably connected to the top of the fixed base (1) through the limiting ring (3042), and the side of the mixing tank (3041) is rotatably connected to the side of the discharge pipe (5). The heating coil (6) includes a left electrode (601), a right electrode (602) is fixedly connected to the side of the left electrode (601), an external electric ring (603) is fixedly connected to the side of the left electrode (601), an internal electric ring (604) is fixedly connected to the side of the right electrode (602), and a heating ring (605) is fixedly connected to the end of the left electrode (601) away from the external electric ring (603). The left electrode (601) passes through the side of the left stirring shell (2) and is rotatably connected to the side of the left stirring shell (2). The heating ring (605) is located at the center of the limiting outer ring (502). 2.The mixing device based on metal powder 3D printing according to claim 1, characterized in that: The feed pipe (4) includes a feeding pipe (401). A rotating ring (402) is sleeved and fixedly connected to one end of the side of the feeding pipe (401). A dispersing blade (403) is rotatably connected to the inner wall of the feeding pipe (401) through a bracket. An air inlet connector (404) is connected to one end of the feeding pipe (401) away from the rotating ring (402). A sealing assembly (405) is connected to the top of the feeding pipe (401). The movable end of a first telescopic rod (406) is fixedly connected to the top of the sealing assembly (405). The side of the feeding pipe (401) is rotatably connected to the side of the conical pipe (301). The rotating ring (402) is located inside the conical pipe (301).

3. The mixing device based on metal powder 3D printing according to claim 2, characterized in that: The dispersing blade (403) includes a rotating shaft (4031), a guide blade (4032) is fixedly connected to the side of the rotating shaft (4031), an air guide blade (4033) is fixedly connected to the side of the guide blade (4032), an air vent (4034) is provided on the inner wall of the air guide blade (4033), the rotating shaft (4031) is rotatably connected to the inner wall of the feeding pipe (401) through a bracket, the guide blade (4032) is located on one side of the air inlet connector (404), and the guide blade (4032) is located below the sealing assembly (405).

4. The mixing device based on metal powder 3D printing according to claim 2, characterized in that: The sealing assembly (405) includes a sealing piston (4051), a spring rod (4052) is fixedly connected to the top of the sealing piston (4051), a limit tube (4053) is sleeved and fixedly connected to the top of the spring rod (4052), a stop ring (4054) adapted to the sealing piston (4051) is fixedly connected to the inner wall of the feeding tube (401), and the top of the spring rod (4052) is fixedly connected to the movable end of the first telescopic rod (406).

5. A mixing device based on metal powder 3D printing according to claim 2, characterized in that: The discharge pipe (5) includes a limiting inner ring (501), a limiting outer ring (502) is sleeved and fixedly connected to the side of the limiting inner ring (501), a connecting pipe (503) is connected to the bottom of the limiting inner ring (501), a delivery pipe (504) is connected to the side of the connecting pipe (503), the fixed end of the second telescopic rod (505) is fixedly connected to the bottom of the connecting pipe (503), a sealing block (506) is fixedly connected to the movable end of the second telescopic rod (505), and the sealing block (506) is disposed inside the connecting pipe (503).

6. A mixing device based on metal powder 3D printing according to claim 5, characterized in that: The side of the limiting inner ring (501) is rotatably connected to the side of the left stirring shell (2), and the side of the limiting inner ring (501) away from the left stirring shell (2) is rotatably connected to the side of the mixing tank (3041). The limiting outer ring (502) is disposed on the side of the mixing tank (3041) and is rotatably connected to the mixing tank (3041).

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