A 3D printing multi-material mixing device

Abstract

The present invention belongs to the field of 3D printing technology and discloses a 3D printing multi-raw material mixing device, comprising a housing, a cylinder fixed in the housing, a through groove at the bottom of the cylinder, a round tube fixed on the side wall of the cylinder, a feed pipe connected to the other end of the round tube, an air pump at the other end of the feed pipe, multiple powder bins above the feed pipe, and a quantitative feeding module between the powder bins and the feed pipe; a powder distribution module is provided in the cylinder, a discharge roller is provided below the cylinder, a baffle is provided on one side of the discharge roller, one end of the baffle contacts the outer wall of the discharge roller, and the other end is fixed to the housing, the powder distribution module can evenly spread the material sent from the feed pipe to the cylinder through the through groove between the discharge roller and the baffle, a discharge trough is provided at the bottom of the housing below the discharge roller, and the discharge roller can spread the material from the discharge trough when it rotates. This invention solves the problem of the limitations of the premixing method in the SLM printing process in material selection and gradient material printing.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing, and in particular relates to a 3D printing multi-material mixing device. Background Art

[0002] Metal 3D printing technology not only significantly reduces component processing time and costs, but also meets complex customization requirements and lightweight designs. It is now widely used in fields such as aerospace and medical devices. Among them, the SLM (Selective Laser Melting) process is the most widely used due to its high precision and good surface quality.

[0003] During part printing, the SLM process spreads powder from a powder cylinder onto a substrate using a scraper. During the spreading process, the mixed powder gathers in front of the scraper and moves under its push. Due to a wider particle size distribution and varying shapes, the mixed powder may have reduced fluidity, affecting the uniformity of the spread and increasing holes or warping in the printed part. Furthermore, the mixed powder piled up in front of the scraper is prone to segregation during the pushing process, meaning that denser powder gradually gathers below the entire pile, leaving only less dense metal in the latter half of the spread. This leaves room for improvement in the spread. While metal powders with minimal density differences and uniform particle size distribution are selected to mitigate the impact of these defects, this also limits the range of metals available for mixing. Furthermore, the powder is mixed externally pre-mixed, with only a powder cylinder and a fixed ratio of mixed metal powder in the print chamber, making it impossible to print gradient materials. These indications indicate that this "pre-mixed" mixing method has significant limitations in terms of both the diversity of material selection and the demands of gradient material printing. Summary of the Invention

[0004] The purpose of the present invention is to propose a 3D printing multi-material mixing device in order to solve the problem of the limitations of the pre-mixing method in material selection and gradient material printing in the SLM printing process.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A 3D printing multi-raw material mixing device includes a shell that can slide left and right in the printing device. A horizontal cylinder is fixed in the shell, a through groove is opened along the generatrix at the bottom of the cylinder, a circular tube is fixed on the side wall of the cylinder, the circular tube is connected to the inner cavity of the cylinder, the other end of the circular tube extends out of the shell and is connected to a feed pipe, the other end of the feed pipe is provided with an air pump, a plurality of powder bins are provided above the feed pipe between the circular tube and the air pump, the bottom of each powder bin is connected to the side wall of the feed pipe, and a quantitative feeding module is provided between the powder bin and the feed pipe; a powder distribution module is provided in the cylinder, a discharge roller is provided below the cylinder, the axis of the discharge roller is parallel to the axis of the cylinder, a baffle is provided on one side of the discharge roller, one end of the baffle is in contact with the outer wall of the discharge roller, and the other end is fixed to the shell, the powder distribution module can evenly spread the material sent from the feed pipe to the cylinder by the air pump through the through groove between the discharge roller and the baffle, a discharge trough is opened at the bottom of the shell below the discharge roller, and the discharge roller can spread the material from the discharge trough when it rotates.

[0007] As a further description of the above technical solution:

[0008] The powder bin is located outside the printing bin of the printer, and the feed pipe at the bottom of the powder bin, one end away from the air pump, extends into the printing bin, and the air pump is located at the upper part of the printing bin cavity; when in use, the air pump blows the inert gas in the printing bin into the feed pipe, and then blows the material falling from the powder bin into the feed pipe into the cylinder; an electric push rod is fixed on the shell, and the other end of the electric push rod is fixed to the inner wall of the printing bin, and the electric push rod drives the shell to slide left and right; the inner diameter of the round tube is equal to the outer diameter of the feed pipe, and the feed pipe can be inserted into the round tube when the shell moves, thereby realizing a detachable connection between the round tube and the feed pipe.

[0009] As a further description of the above technical solution:

[0010] The quantitative blanking module includes a round roller, which is located at the bottom of the powder bin, and the side walls and two end faces of the round roller are in contact with the inner wall of the powder bin. A groove is provided on the side wall of the round roller, and a stepper motor is provided on the outside of the powder bin. The rotating shaft of the stepper motor extends into the powder bin and is connected to the round roller. The quantitative blanking of the powder bin into the feeding pipe is achieved by controlling the rotation angle of the stepper motor and the size of the groove.

[0011] As a further description of the above technical solution:

[0012] The powder distribution module includes an inner cylinder, which is coaxially arranged with the cylinder, one end of the inner cylinder is set to be open, and a disc is fixed at the other end. A ring is fixed to the outside of the disc through a connecting block, and a circular groove is opened on the side wall of the inner cylinder. The diameter of the circular groove is equal to the inner diameter of the circular tube. A spiral blade is provided in the inner cylinder, and the spiral blade is fixed to the inner wall of the inner cylinder. A filter plate is provided at one end of the opening of the inner cylinder, and a plurality of material-diverting plates are provided between the filter plate and the inner cylinder, and each material-diverting plate is parallel to the radial direction of the inner cylinder; two parallel vertical plates are fixed below the through groove, wherein the height of the vertical plate on one side is greater than the height of the vertical plate on the other side and a flat plate is fixed at the lower end, and the two vertical plates and the flat plate are connected. An L-shaped slider is provided in the middle, and a round rod is fixed on the upper end of the slider. The upper end of the round rod is located between the disc and the ring, and the side of the slider facing the filter plate is an inclined surface; when in use, the air pump blows the material in the feed pipe into the inner cylinder through the circular tube, and the gas is discharged from the filter plate. The material gathers in the inner cylinder cavity, and then the inner cylinder moves axially in the cylinder and rotates at the same time. The spiral blades and the material stripping plate mix the material and push the material onto the flat plate. Then the inclined surface on the slider scrapes the material off the flat plate. Since the distance between the two vertical plates and the distance between the flat plate and the inner wall of the cylinder remain unchanged, the amount of material gathered on the flat plate is equal everywhere in the length direction.

[0013] As a further description of the above technical solution:

[0014] An arc-shaped plate is fixed to one end of the material-dispensing plate close to the outer wall of the cylinder. The arc-shaped plate is coaxial with the cylinder, and the central angle corresponding to the arc-shaped plate is larger than the central angle corresponding to the through groove, so that the material cannot fall on the flat plate when the powder distribution module is not moving.

[0015] As a further description of the above technical solution:

[0016] A partition is fixed in the shell, and the cylinder, discharge roller and baffle are all located on one side of the partition. A screw is coaxially arranged in the cylinder, and a screw nut is provided at the center of the disc and the filter plate. One end of the screw is rotatably connected to the side wall of the shell, and the other end passes through the partition and is connected to a first motor. The first motor is fixed on the inner wall of the shell on the other side of the partition; when the first motor rotates, it drives the screw to rotate, and when the screw rotates, it can drive the powder distribution module to move axially and rotate through the disc and the filter plate.

[0017] As a further description of the above technical solution:

[0018] There are multiple diamond-shaped grooves on the side wall of the discharge roller. The rotating shaft of the discharge roller passes through the partition and is connected to the second motor. When the second motor drives the discharge roller to rotate, the material falls into the groove and rotates with the groove to the bottom of the baffle, and then separates from the shell from the discharge groove.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] (1) The present invention draws on the working mode of printing and discharging at the same time in the laser metal deposition process, and changes the original pre-mixing step in the selective laser melting process into online mixing. When in use, the powders to be mixed are respectively filled in different powder bins, and the air pump and powder distribution module are used to transport the powder while completing the mixing of different metal powders. The mixing method combines pneumatic mixing and spiral blade forced mixing to ensure the mixing effect, with a compact structure and ingenious design.

[0021] (2) The present invention changes the original scraper scraping action into the shell scattering action, and the discharge roller in the shell directly sprinkles the powder that has been mixed twice onto the substrate, completely avoiding the situation where the mixed powder piled in front of the scraper is prone to segregation when the scraper is scraping. The uniformity of the mixed powder on the substrate is better, which effectively reduces the probability of holes or warping defects on the printed part and improves the mechanical properties of the printed part.

[0022] (3) When in use, the present invention can adopt an online mixing working mode, in which different metal powders are placed in different powder bins, and the air pump and the powder distribution module complete the transportation and mixing of different metal powders; it can also adopt a premixing working mode, in which the premixed metal powder is placed in one of the powder bins, and only one powder bin is used to discharge the powder. After the air pump and the powder distribution module transport and re-mix the premixed mixed powder, the discharging roller still completes the spreading action, and the defect of segregation easily occurring in the scraper scraping action can still be avoided.

[0023] (4) The present invention adopts an online mixing method, which avoids the need to consider the density and particle size differences of different metals during premixing, and has a wider range of metal types to choose from when mixing metals, which is conducive to exploring the potential and application of SLM technology in the fields of functional gradient materials and in-situ alloying. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the present invention when in use;

[0025] Figure 2 A perspective view of the present invention;

[0026] Figure 3 Schematic diagram of the internal structure of the housing 1 of the present invention;

[0027] Figure 4 It is a cross-sectional view of the internal structure of the housing 1 of the present invention;

[0028] Figure 5 An exploded view of the internal structure of the housing 1 of the present invention;

[0029] Figure 6 Schematic diagram of the assembly of the cylinder 2 and the tube 4 of the present invention;

[0030] Figure 7This is a structural diagram of the powder distribution module of the present invention;

[0031] Figure 8 It is a parts diagram of the discharge roller 8 of the present invention;

[0032] Figure 9 FIG. 2 is a component diagram of the slider 22 of the present invention;

[0033] Figure 10 It is a structural schematic diagram of the quantitative blanking module of the present invention.

[0034] Legend: 1. Shell; 2. Cylinder; 3. Through groove; 4. Round tube; 5. Feed pipe; 6. Air pump; 7. Powder bin; 8. Discharge roller; 9. Baffle; 10. Discharge chute; 11. Round roller; 12. Groove; 13. Inner cylinder; 14. Disc; 15. Ring; 16. Round groove; 17. Spiral blade; 18. Filter plate; 19. Diverter plate; 20. Vertical plate; 21. Flat plate; 22. Slider; 23. Round rod; 24. Arc plate; 25. Partition; 26. Screw; 27. First motor; 28. Sink; 29. ​​Second motor. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0036] See also Figure 1-10 , the present invention provides a technical solution for 3D printing multi-material mixing equipment:

[0037] A 3D printing multi-material mixing device includes a housing 1, a motorized push rod fixed to the housing 1, the other end of which is fixed to the inner wall of the printing chamber, and the motorized push rod drives the housing 1 to slide left and right; a horizontal cylinder 2 is fixed in the housing 1, a through groove 3 is opened along the generatrix at the bottom of the cylinder 2, a circular tube 4 is fixed to the side wall of the cylinder 2, the circular tube 4 is connected to the inner cavity of the cylinder 2, the other end of the circular tube 4 extends out of the housing 1 and is connected to a material delivery pipe 5, the inner diameter of the circular tube 4 is equal to the outer diameter of the material delivery pipe 5, and the material delivery pipe 5 can be inserted into the circular tube 4 when the housing 1 moves, thereby realizing a detachable connection between the circular tube 4 and the material delivery pipe 5;

[0038] An air pump 6 is provided at the other end of the feeding pipe 5. A plurality of powder bins 7 are provided above the feeding pipe 5 between the circular tube 4 and the air pump 6. The bottom of each powder bin 7 is connected to the side wall of the feeding pipe 5. The powder bin 7 is located outside the printing bin of the printer. The end of the feeding pipe 5 at the bottom of the powder bin 7 away from the air pump 6 extends into the printing bin. The air pump 6 is located at the upper part of the printing bin cavity. When in use, the air pump 6 blows the inert gas in the printing bin into the feeding pipe 5, and then blows the material falling from the powder bin 7 into the feeding pipe 5 into the cylinder 2.

[0039] A quantitative blanking module is provided between the powder bin 7 and the feeding pipe 5. The quantitative blanking module includes a round roller 11. The round roller 11 is located at the bottom of the powder bin 7, and the side walls and two end faces of the round roller 11 are in contact with the inner wall of the powder bin 7. A groove 12 is provided on the side wall of the round roller 11. A stepper motor is provided on the outside of the powder bin 7. The rotating shaft of the stepper motor extends into the powder bin 7 and is connected to the round roller 11. The quantitative blanking of the powder bin 7 into the feeding pipe 5 is achieved by controlling the rotation angle of the stepper motor and the size of the groove 12.

[0040] A powder distribution module is provided in the cylinder 2, which includes an inner cylinder 13, which is coaxially arranged with the cylinder 2, one end of the inner cylinder 13 is set to be open, and a disc 14 is fixed to the other end. A ring 15 is fixed to the outside of the disc 14 through a connecting block, and a circular groove 16 is opened on the side wall of the inner cylinder 13. The diameter of the circular groove 16 is equal to the inner diameter of the circular tube 4. A spiral blade 17 is provided in the inner cylinder 13, and the spiral blade 17 is fixed to the inner wall of the inner cylinder 13. A filter plate 18 is provided at one end of the opening of the inner cylinder 13, and a plurality of stripping plates 19 are provided between the filter plate 18 and the inner cylinder 13, each stripping plate 19 is parallel to the radial direction of the inner cylinder 13; an arc plate 24 is fixed to one end of the stripping plate 19 close to the outer wall of the cylinder 2, and the arc plate 24 is coaxial with the cylinder 2, and the central angle corresponding to the arc plate 24 is greater than the central angle corresponding to the through groove 3, so that the material cannot fall on the flat plate 21 when the powder distribution module is not moved;

[0041] Two parallel vertical plates 20 are fixed under the through groove 3, wherein the height of the vertical plate 20 on one side is greater than the height of the vertical plate 20 on the other side and a flat plate 21 is fixed at the lower end. An L-shaped slider 22 is provided between the two vertical plates 20 and the flat plate 21, and a round rod 23 is fixed at the upper end of the slider 22. The upper end of the round rod 23 is located between the disc 14 and the ring 15, and the side of the slider 22 facing the filter plate 18 is an inclined surface; when in use, the air pump 6 blows the material in the feed pipe 5 into the inner cylinder 13 through the circular pipe 4, and the gas is discharged from the filter plate 18, and the material is gathered in the cavity of the inner cylinder 13. Then the inner cylinder 13 moves axially in the cylinder 2 and rotates at the same time. The spiral blades 17 and the material stripping plate 19 mix the material and push it onto the flat plate 21. Then the inclined surface on the slider 22 scrapes the material from the flat plate 21. Since the distance between the two vertical plates 20 and the distance between the flat plate 21 and the inner wall of the cylinder 2 are unchanged, the amount of material gathered on the flat plate 21 is equal everywhere in the length direction;

[0042] A discharge roller 8 is provided below the cylinder 2. The axis of the discharge roller 8 is parallel to the axis of the cylinder 2. A baffle 9 is provided on one side of the discharge roller 8. One end of the baffle 9 contacts the outer wall of the discharge roller 8, and the other end is fixed to the housing 1. A plurality of diamond-shaped troughs 28 are provided on the side wall of the discharge roller 8. The rotating shaft of the discharge roller 8 passes through the partition 25 and is connected to a second motor 29. When the second motor 29 drives the discharge roller 8 to rotate, the material falls into the trough 28 and rotates with the trough 28 to the bottom of the baffle 9, and then leaves the housing 1 at the discharge trough 10.

[0043] The powder distribution module can pump the air pump 6 from the feed pipe 5 to the material in the cylinder 2 and evenly spread it between the discharge roller 8 and the baffle 9 through the through groove 3. A discharge groove 10 is opened at the bottom of the shell 1 below the discharge roller 8. The discharge roller 8 can spread the material from the discharge groove 10 when it rotates.

[0044] A partition 25 is fixed in the shell 1, and the cylinder 2, the discharge roller 8 and the baffle 9 are all located on one side of the partition 25. A lead screw 26 is coaxially provided in the cylinder 2, and a lead screw nut is provided at the center of the disc 14 and the filter plate 18. One end of the lead screw 26 is rotatably connected to the side wall of the shell 1, and the other end passes through the partition 25 and is connected to the first motor 27. The first motor 27 is fixed on the inner wall of the shell 1 on the other side of the partition 25; when the first motor 27 rotates, it drives the lead screw 26 to rotate, and when the lead screw 26 rotates, it can drive the powder distribution module to move axially and rotate through the disc 14 and the filter plate 18.

[0045] Working principle:

[0046] Before use, the present invention connects the air pump 6, electric push rod, stepper motor, first motor 27 and second motor 29 to the printer controller and turns on the power supply. Then, the multiple metals to be mixed are added to the multiple powder bins 7 respectively. When in use, the printer power is turned on. According to the metal ratio of each mixing, the angle of single rotation of each stepper motor is set. Then, the model data of the printed part is input into the printer, the printing bin is closed, and inert gas is filled into the printing bin. After the inert gas is completely filled, the controller starts to print the part according to the program.

[0047] The controller first drives the shell 1 to move in the direction of the feeding pipe 5 through the electric push rod, and learns the position of the shell 1 through the electric push rod. At this time, the powder distribution module is already located in the cylinder 2 near the end of the feeding pipe 5. The circular groove 16 on the inner cylinder 13 is coaxial with the circular tube 4. When the shell 1 moves to the end of the feeding pipe 5 located in the printing chamber and is embedded in the circular tube 4, the electric push rod stops pushing, and the controller completes the first quantitative discharge of the powder bin 7 into the feeding pipe 5 through the stepper motor. The controller then starts the air pump 6, which blows the inert gas in the printing chamber into the feeding pipe 5, thereby The powder is blown from the feed pipe 5 into the inner cavity of the inner cylinder 13, and the airflow is discharged from the filter plate 18, where the metal powder accumulates in the cavity of the inner cylinder 13. During this process, the material is initially mixed by the airflow while in the feed pipe 5. The airflow then carries the powder to the inner cylinder 13. Since the spiral blades 17 are fixed to the inner wall of the inner cylinder 13, the airflow also flows in a spiral state. Under the action of centrifugal force, the metal powder is thrown onto the inner wall of the inner cylinder 13 and cannot continue to move with the airflow. In other words, the metal powder is blocked by the spiral blades 17, and the airflow flows between the spiral blades 17 and the screw 26 to the filter plate 18.

[0048] Then the controller turns off the air pump 6 and starts the electric push rod to drive the shell 1 out of the feeding pipe 5. Before the shell 1 moves above the base plate, the controller starts the first motor 27. The first motor 27 drives the powder distribution module to move axially and rotate in the cylinder 2 through the screw 26, screw nut, disc 14 and filter plate 18. When the powder distribution module rotates, the spiral blade 17 will mix the material in the inner cylinder 13 again and push the material to the material plate 19. The re-mixed material passes between the curved plate 24 and the material plate 19 and falls onto the flat plate 21, and the material will fill the two vertical plates 2. 0, the upper end of the material is flush with the inner wall of the cylinder 2. In addition, the axial distance moved by the powder distribution module during one rotation is less than the length of the material stripping plate 19, thereby avoiding periodic fluctuations in the amount of material falling on the flat plate 21 due to the obstruction of the curved plate 24. When the powder distribution module moves axially, the ring 15 pushes the slider 22 to move synchronously through the round rod 23. The inclined surface on the slider 22 pushes the material on the flat plate 21 from the flat plate 21 to the discharge roller 8. When the powder distribution module moves to the other end of the cylinder 2, the controller reverses the first motor 27, and the powder distribution module returns to the position before the movement.

[0049] When the housing 1 moves to one side of the substrate, the second motor 29 is started, and the discharge roller 8 begins to rotate. Since the distance between the two vertical plates 20 and the distance from the flat plate 21 to the cylinder 2 are both fixed values, the amount of material between the discharge roller 8 and the baffle 9 is equal in the axial direction, and the size and depth of each diamond-shaped trough 28 are exactly the same. Therefore, when the discharge roller 8 rotates, the trough 28 will evenly spread the material between the discharge roller 8 and the baffle 9 on the substrate. When the housing 1 sweeps across the entire substrate, the substrate is evenly covered with a layer of mixed powder.

[0050] It should be noted that when the powder distribution module starts to rotate, the powder near the material plate 19 will fall directly onto the flat plate 21, and this part of the powder will not participate in the re-mixing of the spiral blade 17. Therefore, in order to avoid insufficient mixing of this part of the powder, the position of the powder distribution module when it starts to drop the material is located on both sides of the substrate, and the powder distribution width of the powder distribution module between the discharge roller 8 and the baffle 9 is greater than the width of the substrate, thereby preventing the powder scattered when the powder distribution module starts to rotate from participating in the printing work.

[0051] When there is no need for gradient printing, only one powder bin 7 can be used to hold the premixed powder. During use, the air blowing action and the spiral blade 17 structure can enhance the mixing of the premixed powder, and the powder is still spread in the form of falling materials, directly avoiding the segregation defects that exist when the scraper scrapes the powder.

[0052] The above description is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, and all of these should be covered by the protection scope of the present invention.

Claims

1. A 3D printing multi-material mixing device, comprising a housing (1), characterized in that The shell (1) can slide left and right in the printing device. A horizontal cylinder (2) is fixed in the shell (1). A through groove (3) is opened along the busbar at the bottom of the cylinder (2). A circular tube (4) is fixed on the side wall of the cylinder (2). The circular tube (4) is connected to the inner cavity of the cylinder (2). The other end of the circular tube (4) extends out of the shell (1) and is connected to a feed pipe (5). An air pump (6) is provided at the other end of the feed pipe (5). A plurality of powder bins (7) are provided above the feed pipe (5) between the circular tube (4) and the air pump (6). The bottom of each powder bin (7) is connected to the side wall of the feed pipe (5). A quantitative blanking module is provided between the powder bin (7) and the feed pipe (5). A powder distribution module is provided in the cylinder (2), and a discharge roller (8) is provided below the cylinder (2). The axis of the discharge roller (8) is parallel to the axis of the cylinder (2). A baffle (9) is provided on one side of the discharge roller (8). One end of the baffle (9) contacts the outer wall of the discharge roller (8), and the other end is fixed to the shell (1). The powder distribution module can send the material sent by the air pump (6) from the feed pipe (5) to the cylinder (2) through the through groove (3) and evenly spread it between the discharge roller (8) and the baffle (9). A discharge groove (10) is opened at the bottom of the shell (1) below the discharge roller (8). When the discharge roller (8) rotates, the material can be discharged from the discharge groove (10). The powder distribution module comprises an inner cylinder (13), the inner cylinder (13) and the cylinder (2) are coaxially arranged, one end of the inner cylinder (13) is set as an opening, and a disk (14) is fixed at the other end, a ring (15) is fixed on the outside of the disk (14) through a connecting block, a circular groove (16) is opened on the side wall of the inner cylinder (13), the diameter of the circular groove (16) is equal to the inner diameter of the circular tube (4), a spiral blade (17) is provided in the inner cylinder (13), and the spiral blade (17) is fixed to the inner wall of the inner cylinder (13), a filter plate (18) is provided at one end of the opening of the inner cylinder (13), and the filter plate (18) and the inner cylinder (13) are connected. A plurality of material-diverting plates (19) are provided between the two plates, each of which is parallel to the radial direction of the inner cylinder (13); two parallel vertical plates (20) are fixed below the through groove (3), wherein the height of the vertical plate (20) on one side is greater than the height of the vertical plate (20) on the other side and a flat plate (21) is fixed at the lower end, an L-shaped slider (22) is provided between the two vertical plates (20) and the flat plate (21), a round rod (23) is fixed at the upper end of the slider (22), the upper end of the round rod (23) is located between the disc (14) and the ring (15), and the side of the slider (22) facing the filter plate (18) is an inclined surface.

2. The device according to claim 1, characterized in that The powder bin (7) is located outside the printing bin of the printer, and the feed pipe (5) at the bottom of the powder bin (7) extends into the printing bin at one end away from the air pump (6), and the air pump (6) is located in the upper part of the printing bin cavity; an electric push rod is fixed on the shell (1), and the other end of the electric push rod is fixed to the inner wall of the printing bin, and the electric push rod drives the shell (1) to slide left and right; the inner diameter of the circular tube (4) is equal to the outer diameter of the feed pipe (5), and the feed pipe (5) can be inserted into the circular tube (4) when the shell (1) moves.

3. The device according to claim 1, characterized in that The quantitative blanking module includes a round roller (11), which is located at the bottom of the powder bin (7), and the side wall and two end faces of the round roller (11) are in contact with the inner wall of the powder bin (7), and a groove (12) is provided on the side wall of the round roller (11). A stepper motor is provided on the outside of the powder bin (7), and the rotating shaft of the stepper motor extends into the powder bin (7) and is connected to the round roller (11).

4. The device according to claim 1, characterized in that An arc-shaped plate (24) is fixed to one end of the material-selecting plate (19) close to the outer wall of the cylinder (2). The arc-shaped plate (24) is coaxial with the cylinder (2), and the central angle corresponding to the arc-shaped plate (24) is greater than the central angle corresponding to the through groove (3).

5. The device according to claim 1, characterized in that A partition (25) is fixed in the shell (1), and the cylinder (2), the discharge roller (8) and the baffle (9) are all located on one side of the partition (25). A lead screw (26) is coaxially provided in the cylinder (2), and a lead screw nut is provided at the center of the disc (14) and the filter plate (18). One end of the lead screw (26) is rotatably connected to the side wall of the shell (1), and the other end passes through the partition (25) and is connected to a first motor (27). The first motor (27) is fixed on the inner wall of the shell (1) on the other side of the partition (25).

6. The device according to claim 5, characterized in that A plurality of diamond-shaped grooves (28) are formed on the side wall of the discharge roller (8), and the rotating shaft of the discharge roller (8) passes through the partition (25) and is connected to the second motor (29).

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