Additive printer

Abstract

The invention relates to an additive printer which comprises a printer body with a printing bin and a screening bin, a printing platform is slidably connected into the printing bin, the screening bin communicates with the printing bin through an air suction pipe, the additive printer further comprises a screening and recycling mechanism, the screening and recycling mechanism comprises a plurality of screens, a pressing block and a driving assembly, and the screens are movably connected into the screening bin correspondingly; the pressing block is slidably connected into the screening bin, a guide groove is formed in the pressing block, the side, close to the screens, of the guide groove is gradually shrunk from the side, away from the screens, of the guide groove, and the driving assembly is used for driving the pressing block to slide and driving the screens to move. And the pressing block moves downwards to compact the metal powder in the printing bin. And waste caused by splashing of the powder and pollution to the working environment are reduced. And the purity and the uniformity of the recycled metal powder are improved, and follow-up reutilization is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of additive printers, and particularly to an additive printer. Background Art

[0002] An additive printer is a device that uses additive manufacturing technology to manufacture three-dimensional objects from metal materials. It forms the required metal components by melting and stacking metal powders or wires layer by layer under the action of high-energy beam currents (such as laser beams, electron beams, etc.).

[0003] In the existing additive printers, after 3D printing, the unmolten metal powders from a single print are usually directly discarded, and the metal powders are prone to dust diffusion. Summary of the Invention

[0004] In order to reduce the possibility of dust diffusion of the used metal powders, the present application provides an additive printer.

[0005] An additive printer provided by the present application adopts the following technical solutions: An additive printer includes a printer main body having a printing chamber and a screening chamber. A printing platform is slidably connected in the printing chamber. The screening chamber is communicated with the printing chamber through an air suction pipe. It further includes a screening and recycling mechanism. The screening and recycling mechanism includes a plurality of screening meshes, a pressing block, and a driving assembly. The plurality of screening meshes are respectively movably connected in the screening chamber. The pressing block is slidably connected in the screening chamber. A guiding groove is provided on the pressing block. The guiding groove is tapered from the side close to the screening mesh to the side far from the screening mesh. The driving assembly is used to drive the sliding of the pressing block and the movement of the screening meshes. When the printing platform moves upward, the plurality of screening meshes move, and the pressing block moves downward to compact the metal powders in the printing chamber.

[0006] By adopting the above technical solutions, during the printing process, the pressing block confines the powders in a certain space, reducing the waste caused by powder splashing everywhere and the pollution to the working environment. After printing, when the printing platform moves downward, the pressing block also moves downward to compact the metal powders, reducing the possibility of powder dust diffusion caused by factors such as the movement of the printing platform and the vibration of the equipment. A plurality of screening meshes are provided in the screening chamber, and these screening meshes screen the incoming metal powders. The plurality of screening meshes movably connected in the screening chamber can not only screen the particle sizes of the metal powders during the screening process, ensuring that the recycled metal powders have high purity and uniformity, which is beneficial for subsequent reuse, but also play a role in blocking powder dust, and at the same time reduce the generation of dust or the influence on printing quality by impurities and uneven particles during the printing process.

[0007] Preferably, the driving assembly includes a first threaded rod and a second threaded rod. The first threaded rod is rotatably connected in the printing bin, passes through and is threadedly connected to the printing platform. A first gear is provided on the first threaded rod. The second threaded rod is rotatably connected in the screening bin, passes through and is threadedly connected to the pressing block. A plurality of cams are provided on the second threaded rod. The plurality of cams respectively correspond to a plurality of sieve meshes. Connecting rings are respectively formed on the plurality of sieve meshes. The circumferential sides of the plurality of cams are respectively slidably connected to the inner walls of the connecting rings. The connecting rings are not coaxial with the second threaded rod. A second gear is provided on the second threaded rod. The second gear is meshed and connected with the first gear.

[0008] By adopting the above technical solution, when printing is required, the first threaded rod is driven to rotate. Since the first threaded rod is threadedly connected to the printing platform, the printing platform will move upward along the first threaded rod. The first gear meshes with the second gear to drive the second threaded rod to rotate. The cams on the second threaded rod rotate along with the second threaded rod. The eccentric movement of the cams drives the sieve meshes to perform periodic activities through the connecting rings, screening the metal powder entering the screening bin. At the same time, the second threaded rod is threadedly connected to the pressing block, and the pressing block will move upward under the rotation of the second threaded rod, preparing to compact the metal powder when the printing platform descends later; when printing is completed, the power source drives the first threaded rod to rotate in the reverse direction, and the printing platform moves downward along the first threaded rod under the action of gravity and the thread. The reverse rotation of the first threaded rod drives the second threaded rod to rotate in the reverse direction through the first gear and the second gear, so that the pressing block moves downward along the second threaded rod to compact the metal powder in the printing bin. During the downward movement of the pressing block, the sieve meshes will also continue to maintain a certain active state under the action of the cams to ensure the normal flow and screening of the powder in the screening bin.

[0009] Preferably, a plurality of V-shaped grooves are provided on the inner wall of the connecting ring. The plurality of V-shaped grooves are evenly distributed along the circumference of the connecting ring, and the plurality of V-shaped grooves communicate with each other to jointly form an annular groove. The circumferential side of the cam is slidably connected to the inner wall of the connecting ring.

[0010] By adopting the above technical solution, when the cam rotates along with the second threaded rod, it slides in the annular groove of the connecting ring. Due to the guiding action of the V-shaped grooves, the rotation of the cam will be converted into a specific movement of the sieve mesh, enabling the sieve mesh to perform periodic vibration or swing according to the design requirements, thereby realizing the effective screening of the metal powder.

[0011] Preferably, a plurality of connecting plates are provided on the spiral push rod. One ends of the plurality of connecting plates away from the spiral push rod are fixedly connected to the rotating sleeve. The plurality of connecting plates are evenly distributed around the circumference of the spiral push rod, and there are gaps between adjacent two of the connecting plates.

[0012] By adopting the above technical solution, the connecting plate connects the screw push rod and the rotating sleeve, enabling the rotating sleeve to stably drive the screw push rod to rotate; the gap between two adjacent connecting plates provides an additional flow channel, improving the processing efficiency and classification effect of the feeding and classification mechanism on metal powder.

[0013] Preferably, it further includes a feeding and classification mechanism for feeding and screening metal powder. The feeding and classification mechanism includes a classification sleeve, a screw push rod, and a driving member. The classification sleeve is disposed in the screening bin, one end of the classification sleeve is connected to the suction pipe, and a plurality of annular channels with different inner diameters are provided on the inner wall of the classification sleeve. The inner diameters of the plurality of annular channels gradually increase from the feeding end to the discharging end. The screw push rod is rotatably connected in the classification sleeve, and screw blades are provided on the screw push rod. The pitch of the screw blades gradually increases from the feeding end to the discharging end. The driving assembly is used to drive the rotation of the screw push rod.

[0014] By adopting the above technical solution, a plurality of annular channels with different inner diameters and gradually increasing inner diameters from the feeding end to the discharging end are provided on the inner wall of the classification sleeve, which cooperate with the screw blades on the screw push rod with a gradually increasing pitch from the feeding end to the discharging end. When the screw push rod rotates, the metal powder moves towards the discharging end under the push of the screw blades. During the movement, the powder with smaller particles is more likely to pass through the annular channels with smaller inner diameters, while the powder with larger particles needs to move along with the screw blades to the annular channels with larger inner diameters to pass through. This preliminarily classifies the metal powder according to the particle size, making the powder entering the screening bin more uniform in particle size, which is beneficial to subsequent more accurate screening operations and improves the efficiency and accuracy of the entire screening and recycling system.

[0015] Preferably, the driving member includes a rotating sleeve, the rotating sleeve is coaxially and fixedly connected to the screw push rod, a first bevel gear is provided on the rotating sleeve, and a second bevel gear is provided on the first threaded rod. The first bevel gear is meshed with the second bevel gear.

[0016] By adopting the above technical solution, the rotational power of the first threaded rod is transmitted to the screw push rod through the meshing of the first bevel gear and the second bevel gear, without the need for an additional independent driving device. This enables the rotation of the screw push rod to be synchronized with the movement of the printing platform, ensuring the coordinated progress of the feeding, classification, and printing processes of the metal powder.

[0017] Preferably, a vibrator is provided on the pressing block.

[0018] By adopting the above technical solution, the vibration of the vibrator can make the powder on the surface of the briquette fall off more easily, reduce the adhesion of the powder to the briquette, and ensure the normal operation of the briquette. When the briquette compacts the metal powder, the vibration of the vibrator can make the powder particles find a closer arrangement more easily under the action of pressure, further improving the compaction degree.

[0019] The technical effects of the present invention are mainly reflected in the following aspects: 1. By setting the sieve mesh and the briquette in the present invention, during the printing process, the briquette confines the powder within a certain space, reducing the waste caused by the powder splashing everywhere and the pollution to the working environment. After the printing is completed, when the printing platform moves downward, the briquette moves downward accordingly to compact the metal powder, reducing the possibility of powder dust diffusion caused by factors such as the movement of the printing platform and equipment vibration. A number of sieve meshes are arranged in the screening bin, and these sieve meshes screen the incoming metal powder. The several sieve meshes movably connected in the screening bin can not only screen the particle size of the metal powder during the screening process, ensure that the recycled metal powder has a high purity and uniformity, which is beneficial to subsequent reuse, but also play a role in blocking powder dust, and at the same time reduce the generation of dust or the influence on printing quality by impurities and uneven particles during the printing process; 2. By setting the baffle and the one-way bearing in the present invention, which work in coordination with the movement of the printing platform, the powder suction operation is matched with the lifting of the printing platform. During the upward movement of the printing platform, as the printing progresses, the metal powder gradually accumulates on the printing platform. At this time, the suction pipe is opened for powder suction, which can timely recover the excess powder and avoid the influence of powder accumulation on printing quality. When the printing platform descends, the suction pipe is closed to prevent powder backflow, ensuring the stable powder state in the printing area, which is beneficial to subsequent compaction and other operations. The return spring always drives the baffle to move to close the suction pipe. When the printing platform descends and powder suction is not required, the baffle can timely close the suction pipe, effectively preventing the metal powder in the screening bin from flowing back to the printing bin through the suction pipe, ensuring the one-way flow of powder between the two chambers, and being beneficial to improving the stability and reliability of the entire printing process; 3. By setting the grading feeding mechanism in the present invention, a plurality of annular channels with different inner diameters and gradually increasing inner diameters from the feeding end to the discharging end are arranged on the inner wall of the grading sleeve, which cooperate with the spiral blades on the spiral push rod with gradually increasing pitch from the feeding end to the discharging end. When the spiral push rod rotates, the metal powder is pushed by the spiral blades towards the discharging end. During the movement, the smaller particle powder is more likely to pass through the annular channels with smaller inner diameters, while the larger particle powder needs to move with the spiral blades to the annular channels with larger inner diameters to pass through. The metal powder is preliminarily graded according to particle size, making the powder entering the screening bin more uniform in particle size, which is beneficial to subsequent more precise screening operations, and improving the efficiency and accuracy of the entire screening and recycling system. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of the structure of the screening bin of an embodiment of the present application.

[0022] Figure 3 It is a schematic diagram of the structure of the screening and recycling mechanism of an embodiment of the present application.

[0023] Figure 4 It is a schematic diagram of the structure of the connecting ring of an embodiment of the present application.

[0024] Figure 5 It is along Figure 4 The enlarged view at position A in

[0025] Figure 6 It is a schematic diagram of the structure of the feeding and grading mechanism of an embodiment of the present application.

[0026] Explanation of reference numerals: 1. Printer main body; 2. Printing bin; 3. Screening bin; 4. Printing platform; 5. Suction pipe; 6. Screening and recycling mechanism; 7. Screen; 8. Pressing block; 9. Driving component; 10. Guide groove; 11. First threaded rod; 12. Second threaded rod; 13. First gear; 14. Cam; 15. Connecting ring; 16. Second gear; 17. V-shaped groove; 18. Annular groove; 19. Feeding and grading mechanism; 20. Grading sleeve; 21. Spiral push rod; 22. Driving part; 24. Annular channel; 25. Spiral blade; 26. Rotating sleeve; 27. First bevel gear; 28. Second bevel gear; 29. Connecting plate. Detailed implementation manners

[0027] The following will further describe the present application in detail with reference to Figures 1-6 to make the technical solutions of the present application easier to understand and master.

[0028] The embodiment of the present application discloses an additive printer.

[0029] Referring to Figure 1 、 Figure 2 and Figure 3, An additive printer according to this embodiment includes a printer body 1 having a printing chamber 2 and a screening chamber 3. A printing platform 4 is slidably connected in the printing chamber 2. The screening chamber 3 is communicated with the printing chamber 2 through an air suction pipe 5. It further includes a screening and recycling mechanism 6. The screening and recycling mechanism 6 includes three screening meshes 7, a pressing block 8 and a driving assembly 9. The three screening meshes 7 are respectively movably connected in the screening chamber 3. The three screening meshes 7 are uniformly distributed in the vertical direction. The pressing block 8 is slidably connected in the screening chamber 3. A guiding groove 10 is provided in the middle section of the pressing block 8 in the length direction. The guiding groove 10 is tapered from the side close to the screening mesh 7 to the side far from the screening mesh 7. The driving assembly 9 is used to drive the sliding of the pressing block 8 and the movement of the screening meshes 7. When the printing platform 4 moves upward, several screening meshes 7 move, and the pressing block 8 moves downward to compact the metal powder in the printing chamber 2.

[0030] Referring to Figure 1 , Figure 2 and Figure 3 , during the printing process, the pressing block 8 confines the powder in a certain space, reducing the waste caused by the powder splashing everywhere and the pollution to the working environment. After the printing is completed, the pressing block 8 moves downward along with the downward movement of the printing platform 4 to compact the metal powder, reducing the possibility of powder dust diffusion caused by factors such as the movement of the printing platform 4 and equipment vibration. A number of screening meshes 7 are provided in the screening chamber 3, and these screening meshes 7 screen the incoming metal powder. The several screening meshes 7 movably connected in the screening chamber 3 can not only screen the particle size of the metal powder during the screening process, ensure that the recycled metal powder has high purity and uniformity, which is beneficial to subsequent reuse, but also play a role in blocking powder dust, and at the same time reduce the generation of dust by impurities and non-uniform particles during the printing process or affect the printing quality.

[0031] Referring to Figure 1 , Figure 2 and Figure 3 , the driving assembly 9 includes a first threaded rod 11 and a second threaded rod 12. The first threaded rod 11 is rotatably connected in the printing chamber 2. The first threaded rod 11 passes through and is threadedly connected to the printing platform 4. A first gear 13 is coaxially and fixedly connected to the first threaded rod 11. The second threaded rod 12 is rotatably connected in the screening chamber 3. The second threaded rod 12 passes through and is threadedly connected to the pressing block 8. Three cams 14 are fixedly connected to the second threaded rod 12. The three cams 14 respectively correspond to several screening meshes 7. Connecting rings 15 are respectively fixedly connected to the three screening meshes 7. The circumferential sides of the three cams 14 are respectively slidably connected to the inner walls of the connecting rings 15. The connecting rings 15 are not coaxial with the second threaded rod 12. A second gear 16 is fixedly connected to the second threaded rod 12. The second gear 16 is meshed and connected to the first gear 13.

[0032] Referring to Figure 1 , Figure 2 andFigure 3 When printing is required, the first threaded rod 11 is driven to rotate. Since the first threaded rod 11 is threadedly connected to the printing platform 4, the printing platform 4 will move upward along the first threaded rod 11. The first gear 13 meshes with the second gear 16 to drive the second threaded rod 12 to rotate. The cam 14 on the second threaded rod 12 rotates with the second threaded rod 12, and the eccentric movement of the cam 14 drives the screen 7 to perform periodic activities through the connecting ring 15, screening the metal powder entering the screening bin 3. At the same time, the second threaded rod 12 is threadedly connected to the pressing block 8, and the pressing block 8 will move upward under the rotation of the second threaded rod 12 to prepare for compacting the metal powder when the printing platform 4 descends later; when printing is completed, the power source drives the first threaded rod 11 to rotate in the reverse direction, and the printing platform 4 moves downward along the first threaded rod 11 under the action of gravity and threads. The reverse rotation of the first threaded rod 11 drives the second threaded rod 12 to rotate in the reverse direction through the first gear 13 and the second gear 16, causing the pressing block 8 to move downward along the second threaded rod 12 to compact the metal powder in the printing bin 2. During the downward movement of the pressing block 8, the screen 7 will also continue to maintain a certain active state under the action of the cam 14 to ensure the normal flow and screening of the powder in the screening bin 3.

[0033] Refer to Figure 3 and Figure 4 As shown in FIGS. and, a plurality of V-shaped grooves are formed on the inner wall of the connecting ring 15. The plurality of V-shaped grooves are uniformly distributed along the circumferential direction of the connecting ring 15, and the plurality of V-shaped grooves communicate with each other to jointly form an annular groove 18. The circumferential side surface of the cam 14 is slidably connected to the inner wall of the connecting ring 15. When the cam 14 rotates with the second threaded rod 12, it slides in the annular groove 18 of the connecting ring 15. Due to the guiding action of the V-shaped groove 17, the rotation of the cam 14 is converted into a specific movement of the screen 7, enabling the screen 7 to perform periodic vibration or swing according to the design requirements, thereby realizing effective screening of the metal powder.

[0034] Refer to Figure 2 and Figure 6 As shown in FIGS. and, it further includes a feeding and grading mechanism 19 for feeding and screening the metal powder. The feeding and grading mechanism 19 includes a grading sleeve 20, a spiral push rod 21, and a driving member 22. The grading sleeve 20 is disposed in the screening bin 3. One end of the grading sleeve 20 is communicated with the suction pipe 5. A plurality of annular channels 24 with different inner diameters are formed on the inner wall of the grading sleeve 20. The plurality of annular channels 24 are uniformly distributed along the axis of the grading sleeve 20, and the inner diameters of the plurality of annular channels 24 gradually increase from the feeding end to the discharging end. The spiral push rod 21 is rotatably connected in the grading sleeve 20. A spiral blade 25 is coaxially and fixedly connected to the spiral push rod 21. The pitch of the spiral blade 25 gradually increases from the feeding end to the discharging end. The driving assembly 9 is used to drive the rotation of the spiral push rod 21.

[0035] Refer toFigure 2 and Figure 6 Inside the inner wall of the grading sleeve 20, a plurality of annular channels 24 with different inner diameters and the inner diameters gradually increasing from the feed end to the discharge end are provided, which cooperate with the spiral blades 25 on the spiral push rod 21 with the pitch gradually increasing from the feed end to the discharge end. When the spiral push rod 21 rotates, the metal powder moves towards the discharge end under the push of the spiral blades 25. During the movement, the powder with smaller particles is more likely to pass through the annular channels 24 with smaller inner diameters, while the powder with larger particles needs to move with the spiral blades 25 to the annular channels 24 with larger inner diameters before it can pass through. The metal powder is preliminarily graded according to the particle size, making the powder entering the screening bin 3 more uniform in particle size, which is beneficial to subsequent more accurate screening operations and improves the efficiency and accuracy of the entire screening and recycling system.

[0036] Refer to Figure 2 and Figure 6 Refer to FIGS. and, the driving member 22 includes a rotating sleeve 26. The rotating sleeve 26 is coaxially and fixedly connected to the spiral push rod 21. A first bevel gear 27 is coaxially and fixedly connected to the rotating sleeve 26. A second bevel gear 28 is coaxially and fixedly connected to the first threaded rod 11. The first bevel gear 27 is meshed with the second bevel gear 28. Through the meshing of the first bevel gear 27 and the second bevel gear 28, the rotational power of the first threaded rod 11 is transmitted to the spiral push rod 21 without an additional independent driving device. This makes the rotation of the spiral push rod 21 synchronized with the movement of the printing platform 4, ensuring the coordinated progress of the feeding, grading and printing processes of the metal powder.

[0037] Refer to Figure 2 and Figure 6 Refer to FIGS. and, a plurality of connecting plates 29 are fixedly connected to the spiral push rod 21. One end of the plurality of connecting plates 29 far from the spiral push rod 21 is fixedly connected to the rotating sleeve 26. The plurality of connecting plates 29 are evenly distributed around the circumference of the spiral push rod 21. There is a gap between adjacent two connecting plates 29. The connecting plates 29 connect the spiral push rod 21 and the rotating sleeve 26, enabling the rotating sleeve 26 to stably drive the spiral push rod 21 to rotate; the gap between adjacent two connecting plates 29 provides an additional flow channel, improving the processing efficiency and grading effect of the feeding and grading mechanism 19 on the metal powder.

[0038] Refer to Figure 2 and Figure 3 Refer to FIGS. and, a vibrator is fixedly connected inside the pressing block 8. The vibration of the vibrator can make the powder on the surface of the pressing block 8 more likely to fall off, reduce the adhesion of the powder on the pressing block 8, and ensure the normal operation of the pressing block 8. When the pressing block 8 compacts the metal powder, the vibration of the vibrator can make the powder particles more likely to find a closer arrangement under the action of pressure, further improving the compaction degree.

[0039] Of course, the above are only typical examples of this application. In addition, this application can also have many other specific implementation manners. Any technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection required by this application.

Claims

1. An additive printer, comprising a printer main body (1) having a printing chamber (2) and a screening chamber (3), a printing platform (4) is slidably connected in the printing chamber (2), and the screening chamber (3) is communicated with the printing chamber (2) through an air suction pipe (5), characterized in that: It further includes a screening and recycling mechanism (6). The screening and recycling mechanism (6) includes a plurality of sieves (7), a pressing block (8) and a driving assembly (9). The plurality of sieves (7) are respectively movably connected in a screening bin (3). The pressing block (8) is slidably connected in the screening bin (3). A guiding groove (10) is provided on the pressing block (8). The side of the guiding groove (10) close to the sieve (7) to the side far from the sieve (7) is tapered. The driving assembly (9) is used to drive the sliding of the pressing block (8) and the movement of the sieve (7). When the printing platform (4) moves upward, the plurality of sieves (7) move, and the pressing block (8) moves downward to compact the metal powder in the printing bin (2).

2. The additive printer according to claim 1, characterized in that: The driving assembly (9) includes a first threaded rod (11) and a second threaded rod (12). The first threaded rod (11) is rotatably connected in the printing bin (2). The first threaded rod (11) passes through and is threadedly connected to the printing platform (4). A first gear (13) is provided on the first threaded rod (11). The second threaded rod (12) is rotatably connected in the screening bin (3). The second threaded rod (12) passes through and is threadedly connected to the pressing block (8). A plurality of cams (14) are provided on the second threaded rod (12). The plurality of cams (14) respectively correspond to the plurality of sieves (7). Connecting rings (15) are respectively provided on the plurality of sieves (7). The circumferential sides of the plurality of cams (14) are respectively slidably connected to the inner walls of the connecting rings (15). The connecting ring (15) is not coaxial with the second threaded rod (12). A second gear (16) is provided on the second threaded rod (12). The second gear (16) is meshed and connected to the first gear (13).

3. An additive printer according to claim 2, characterized in that: A plurality of V-shaped grooves are provided on the inner wall of the connecting ring (15). The plurality of V-shaped grooves are uniformly distributed along the circumference of the connecting ring (15), and the plurality of V-shaped grooves communicate with each other to jointly form an annular groove (18). The circumferential side of the cam (14) is slidably connected to the inner wall of the connecting ring (15).

4. The additive printer according to claim 2, wherein: It further includes a feeding and grading mechanism (19). The feeding and grading mechanism (19) is used for feeding and screening of metal powder. The feeding and grading mechanism (19) includes a grading sleeve (20), a spiral push rod (21) and a driving member (22). The grading sleeve (20) is provided in the screening bin (3). One end of the grading sleeve (20) is communicated with the suction pipe (5). A plurality of annular channels (24) with different inner diameters are provided on the inner wall of the grading sleeve (20). The inner diameters of the plurality of annular channels (24) gradually increase from the feeding end to the discharging end. The spiral push rod (21) is rotatably connected in the grading sleeve (20). A spiral blade (25) is provided on the spiral push rod (21). The pitch of the spiral blade (25) gradually increases from the feeding end to the discharging end. The driving assembly (9) is used to drive the rotation of the spiral push rod (21).

5. The additive printer according to claim 4, wherein: The driving member (22) includes a rotating sleeve (26), the rotating sleeve (26) is coaxially and fixedly connected to the screw push rod (21), a first bevel gear (27) is provided on the rotating sleeve (26), a second bevel gear (28) is provided on the first threaded rod (11), and the first bevel gear (27) is meshed and connected with the second bevel gear (28).

6. The additive printer according to claim 5, wherein: A plurality of connecting plates (29) are provided on the screw push rod (21), one ends of the plurality of connecting plates (29) far away from the screw push rod (21) are fixedly connected to the rotating sleeve (26), the plurality of connecting plates (29) are evenly distributed around the circumferential direction of the screw push rod (21), and there is a gap between two adjacent connecting plates (29).

7. An additive printer according to claim 1, characterized in that: A vibrator is provided on the pressing block (8).

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