A 3D printer based on fused deposition and a 3D printing nozzle thereof

Abstract

The present invention belongs to the technical field of 3D printing equipment, and specifically relates to a 3D printer based on molten deposition and a 3D printing nozzle thereof, wherein the 3D printing nozzle comprises a base, one end of the base is equipped with a feed unit, the other end of the base is equipped with a heat dissipation unit, the lower end of the base is equipped with a heating plate, the lower end of the heating plate is threadedly connected with a nozzle, a throat is equipped between the base and the heating plate, and the feed unit and the throat as well as the nozzle and the throat are mutually adapted, and one side of the interior of the heating plate is equipped with an electric heating block. After stopping the 3D printing operation, the present invention cuts the wire drawing through the dividing edge at one end of the knife plate, and at the same time, the knife plate moved to the lower end of the nozzle can prevent the leaked printing consumables from dripping on the surface of the printed part and the work surface, and can effectively avoid the generation of the wire drawing phenomenon. At the same time, through the cooperation of the stripping knife and the air nozzle, the printing consumables remaining on the surface of the knife plate can be divided and collected.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing equipment, and in particular relates to a 3D printer based on fused deposition and a 3D printing nozzle thereof. Background Art

[0002] With the rapid advancement of science and technology, 3D printing technology has become an important innovation tool in many industries, including manufacturing, medical and construction. This technology creates three-dimensional objects with specific shapes and functions by stacking materials layer by layer. The key lies in the precise control of the nozzle assembly and the work of the feeding device. As the core component of the 3D printer, the nozzle assembly is responsible for accurately spraying molten plastic or other materials to the specified position to form the required three-dimensional structure.

[0003] In the existing 3D printing process, wire drawing occurs frequently. Wire drawing, also known as leakage, beard hanging or fluffing, refers to the many plastic filaments left on the print after printing. This is mainly because the molten plastic inside the nozzle leaks out during the process of the nozzle moving to a new position, and produces fine plastic filaments on the print or work surface, forming wire drawing or hanging materials. In the prior art, the wire drawing phenomenon is mainly alleviated by the reverse rotation of the feed unit and the withdrawal of the printing consumables. However, due to the influence of the withdrawal distance, withdrawal speed, extrusion temperature, physical properties of the printing consumables, moving distance and other factors, the withdrawal method cannot completely eliminate the occurrence of the wire drawing phenomenon. The leaked printing consumables produce wire drawing on the surface of the print or / and the work surface, which not only increases the amount of polishing of the print, but also requires the user to clean the work surface. Based on the above problems, this application document proposes a 3D printer based on fused deposition and its 3D printing nozzle to solve the generation of wire drawing in the 3D printing process. Summary of the invention

[0004] The purpose of the present invention is to provide a 3D printing nozzle. After the 3D printing operation is stopped, the wire drawing is cut by the dividing edge at one end of the knife plate. At the same time, the knife plate moved to the lower end of the nozzle can prevent the leaked printing consumables from dripping onto the surface of the printed part and the work surface, which can effectively avoid the occurrence of wire drawing. At the same time, through the cooperation of the stripping knife and the air nozzle, the printing consumables remaining on the surface of the knife plate can be divided and collected.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A 3D printing nozzle comprises a base, one end of the base is equipped with a feed unit, the other end of the base is equipped with a heat dissipation unit, the lower end of the base is equipped with a heating plate, the lower end of the heating plate is threadedly connected with a nozzle, a throat is arranged between the base and the heating plate, and the feed unit and the throat, as well as the nozzle and the throat are adapted to each other, one side of the interior of the heating plate is equipped with an electric heating block, and a storage groove is provided inside the heating plate, and further comprises:

[0007] An anti-leakage part, the anti-leakage part is assembled inside the heating plate, the anti-leakage part comprises a motor, a first linkage arm, a second linkage arm and a knife plate, the motor is fixed inside the heating plate and is located on one side of the nozzle, the first linkage arm is fixed to the output end of the motor, and the first linkage arm is rotatably connected to the heating plate, the second linkage arm is rotatably connected to the inside of the heating plate and is located on the other side of the nozzle, the knife plate is fixed at the lower ends of the first linkage arm and the second linkage arm, and the knife plate is adapted to the nozzle, and a cutting edge is provided at one end of the knife plate close to the nozzle;

[0008] A chip collecting part, which is assembled inside the base and is matched with the blade;

[0009] Wherein, in the initial state, the knife plate is located inside the receiving groove, and in the working state, the knife plate is located at the lower end of the nozzle.

[0010] In a preferred embodiment, the cross-sectional shape of the blade is arc-shaped, and a matching surface is provided at the lower end of the nozzle. The matching surface is arc-shaped, and the matching surface and the blade are matched.

[0011] In a preferred embodiment, the motor is a high temperature resistant servo motor.

[0012] In a preferred embodiment, the chip collection part includes a wind nozzle, a collection tube and a stripping knife. The wind nozzle is fixed at the lower end of the heating plate, an air inlet is provided at one end of the wind nozzle, and the air inlet extends into the storage groove. The collection tube is fixed at the upper end of the wind nozzle, and the upper end of the collection tube passes through the heating plate. The stripping knife is fixed inside the storage groove and is located at the upper end of the air inlet, and the stripping knife and the knife plate are matched.

[0013] In a preferred embodiment, guide surfaces are obliquely provided on both sides of the upper end of the air nozzle, and the intersection of the two guide surfaces in the extension direction is located inside the collecting tube.

[0014] In a preferred embodiment, a stripping edge is formed at one end of the stripping knife away from the nozzle, and a plurality of dividing edges are evenly formed at the lower end of the stripping knife.

[0015] In a preferred embodiment, the distance between two adjacent dividing edges is denoted as D1, the inner diameter of the collecting tube is denoted as D2, and D1<D2.

[0016] In a preferred embodiment, the material of the tuyere and the collecting tube has low thermal conductivity.

[0017] A 3D printer based on fused deposition includes a 3D printing nozzle as described in any one of the above items, including an XYZ three-axis moving module and a control module, and the control module and the XYZ three-axis moving module are electrically connected through a wire, and the base is assembled on the XYZ three-axis moving module.

[0018] The technical effects achieved by the present invention are:

[0019] After the 3D printing operation is stopped, the leakage of the printing consumables inside the nozzle may cause the wire drawing phenomenon. The motor is started, so that the motor drives the first linkage arm and the knife plate to rotate, so that the knife plate rotates from the inside of the storage groove to the lower end of the nozzle, and the wire drawing is cut by the dividing edge at one end of the knife plate. At the same time, the knife plate moved to the lower end of the nozzle can prevent the leaked printing consumables from dripping onto the surface of the printed part and the work surface, and the wire drawing phenomenon can be effectively avoided by the knife plate;

[0020] When the present invention performs 3D printing again through the nozzle, the motor is rotated in the reverse direction, so that the blade plate is rotated from the lower end of the nozzle to the inside of the storage groove. When the storage groove contacts the stripping knife, the printing consumables remaining on the surface of the blade plate are stripped by the stripping knife. At the same time, the stripped printing consumables are collected through the cooperation of the fan module and the air nozzle, so as to prevent the stripped printing consumables from being scattered on the printed workpiece or the work surface.

[0021] After the blade and the stripping blade come into contact, the present invention can separate the printing consumables remaining on the surface of the blade through the separation edge, and can strip the separated printing consumables through the stripping edge, thereby preventing the collection tube from being blocked by large-sized printing consumables;

[0022] The present invention can store the knife plate in the initial state by arranging a storage groove inside the heating plate, thereby preventing the knife plate in the initial state from affecting the 3D printing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0024] Figure 2 is a bottom view of the overall structure in Embodiment 1 of the present invention;

[0025] Figure 3 is an exploded view of the overall structure in the first embodiment of the present invention;

[0026] Figure 4 is a schematic structural diagram of a heating plate in Embodiment 1 of the present invention;

[0027] Figure 5 is a bottom view of the structure of the heating plate in the first embodiment of the present invention;

[0028] Figure 6 is a structural cross-sectional view of a heating plate in Embodiment 1 of the present invention;

[0029] Figure 7 In the first embodiment of the present invention Figure 6 A local enlarged schematic diagram of the middle A;

[0030] Figure 8 is a schematic diagram of the structure inside the heating plate in the first embodiment of the present invention;

[0031] Fig. 9 is a schematic structural diagram of the anti-leakage portion in the first embodiment of the present invention;

[0032] Fig.10 It is a schematic structural diagram of a chip collecting portion in the first embodiment of the present invention;

[0033] Fig.11 is a schematic structural diagram of a stripping knife in Embodiment 1 of the present invention;

[0034] Fig.12 is a schematic diagram of the blade in the initial state in the first embodiment of the present invention;

[0035] Fig.13 It is a schematic diagram of the structure of the heating plate and the motor in the second embodiment of the present invention.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] 10. Base; 11. Feeding unit; 12. Heat dissipation unit; 13. Heating plate; 14. Nozzle; 15. Throat; 16. Electric heating block; 17. Storage groove; 18. Adaptation surface;

[0038] 20. Anti-leakage part;

[0039] 21. Motor; 22. First linkage arm; 23. Second linkage arm; 24. Blade;

[0040] 30. Chip collection unit;

[0041] 31. Air nozzle; 32. Collecting pipe; 33. Stripping knife; 34. Air inlet; 35. Guide surface; 36. Stripping edge; 37. Splitting edge. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0044] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0045] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0046] Embodiment 1

[0047] Please see attached Figures 1 to 5 as well as Fig. 9 As shown, it is the first embodiment of the present invention, which provides a 3D printing nozzle, including a base 10, one end of the base 10 is equipped with a feeding unit 11, the other end of the base 10 is equipped with a heat dissipation unit 12, the lower end of the base 10 is equipped with a heating plate 13, the lower end of the heating plate 13 is threadedly connected with a nozzle 14, a throat 15 is installed between the base 10 and the heating plate 13, and the feeding unit 11 and the throat 15 as well as the nozzle 14 and the throat 15 are adapted to each other, one side of the interior of the heating plate 13 is equipped with an electric heating block 16, and a storage groove 17 is provided inside the heating plate 13, and also includes:

[0048] The anti-leakage part 20 is assembled inside the heating plate 13. The anti-leakage part 20 includes a motor 21, a first linkage arm 22, a second linkage arm 23 and a knife plate 24. The motor 21 is fixed inside the heating plate 13 and is located on one side of the nozzle 14. The first linkage arm 22 is fixed to the output end of the motor 21, and the first linkage arm 22 is rotatably connected to the heating plate 13. The second linkage arm 23 is rotatably connected to the inside of the heating plate 13 and is located on the other side of the nozzle 14. The knife plate 24 is fixed at the lower ends of the first linkage arm 22 and the second linkage arm 23, and the knife plate 24 is adapted to the nozzle 14. A cutting edge is provided at one end of the knife plate 24 close to the nozzle 14.

[0049] The chip collecting portion 30 is assembled inside the base 10, and the chip collecting portion 30 is matched with the blade 24;

[0050] In the initial state, the knife plate 24 is located inside the receiving groove 17 , and in the working state, the knife plate 24 is located at the lower end of the nozzle 14 .

[0051] Specifically, a multi-axis motion platform and a fan module are used in conjunction with the device. The multi-axis motion platform can drive the base 10, the anti-leakage part 20 and the chip collection part 30 to move synchronously on the X-axis, Y-axis and Z-axis. The fan module and the chip collection part 30 are connected.

[0052] It should be noted that when the nozzle 14 is extruding consumables for printing, the knife plate 24 is in an initial state, and before the knife plate 24 changes from the initial state to the working state, it is necessary to first close the feed unit 11 and stop conveying printing consumables into the throat 15. The base 10, the anti-leakage part 20 and the chip collection part 30 need to be driven by a multi-axis motion platform to move the nozzle 14 away from the printed part, and the distance between the nozzle 14 and the printed part needs to be greater than the distance from the nozzle 14 to the bottom of the knife plate 24.

[0053] Here, the initial state refers to the state of the device when no wire drawing occurs at the lower end of the nozzle 14 (such as during printing, shutdown, standby, etc.), and the working state refers to the state of the device when wire drawing occurs at the lower end of the nozzle 14 (such as when a new position needs to be changed during printing, or when molten plastic leaks after printing).

[0054] In this embodiment, when performing a 3D printing operation, the electric heating block 16 is started to heat the heating plate 13 and the nozzle 14, and the feeding unit 11 is started. The consumables are transported to the inside of the nozzle 14 through the throat 15 through the feeding unit 11 for heating, and the heated and molten printing consumables are extruded from the inside of the nozzle 14 to perform a 3D printing operation. When the nozzle 14 needs to be moved to a new position for printing, or when the nozzle 14 needs to be reset after printing, the feeding unit 11 is reversed to withdraw the printing consumables through the feeding unit 11 to prevent the printing consumables from continuing to be heated. At the same time, the multi-axis motion platform is started to drive the base 10, the nozzle 14, and the anti-static material 20 to move to a new position for printing, or when the nozzle 14 needs to be reset after printing. The leakage part 20 and the chip collecting part 30 move, so that the nozzle 14 moves away from the print workpiece until the minimum distance between the nozzle 14 and the print workpiece is greater than the distance from the nozzle 14 to the bottom of the knife plate 24, so as to avoid the knife plate 24 from contacting the print workpiece during the rotation process, causing the unsolidified print workpiece to deform. During the movement of the nozzle 14, the molten printing consumables inside it leak and draw wires. The motor 21 is started to rotate the motor 21, and the motor 21 drives the first linkage arm 22 to rotate through the fixed connection between the motor 21 and the first linkage arm 22, and the first linkage arm 22 drives the knife plate 24 to rotate through the fixed connection between the first linkage arm 22 and the knife plate 24. The blade 24 is moved so that the blade plate 24 rotates from the inside of the receiving groove 17 to the lower end of the nozzle 14. During the rotation of the blade plate 24, when the cutting edge at one end of the blade plate 24 contacts the wire drawing, the blade plate 24 can cut the wire drawing through the cooperation of the nozzle 14 and the cutting edge. At the same time, after the blade plate 24 moves to the lower end of the nozzle 14, it can effectively prevent the leaked molten consumables from dripping onto the printed part or the work surface to form wire drawing. After the nozzle 14 moves to the target position, when it is necessary to print again, the feed unit 11 is started to transport the printing consumables to the inside of the nozzle 14 again, and the motor 21 is rotated in the reverse direction, so that the motor 21 drives the first linkage arm 22 and the blade plate 24 to reset, so that The knife plate 24 changes from the working state to the initial state. At this time, the knife plate 24 rotates from the lower end of the nozzle 14 to the inside of the storage groove 17, and the nozzle 14 can perform 3D printing operations. By switching the state of the knife plate 24, the problem of residual drawing on the surface of the printed part or the work surface during 3D printing can be solved. At the same time, in the initial state, the first linkage arm 22, the second linkage arm 23 and the knife plate 24 are all located inside the storage groove 17, which will not affect the 3D printing operation, and the first linkage arm 22, the second linkage arm 23 and the knife plate 24 can move synchronously with the nozzle 14, so that the device can avoid the phenomenon of drawing caused by leakage of printing consumables in any scenario.

[0055] Next, please refer to Figure 6 and Figure 7 The cross-sectional shape of the blade 24 is arc-shaped, and a matching surface 18 is provided at the lower end of the nozzle 14 . The matching surface 18 is arc-shaped, and the matching surface 18 and the blade 24 are matched.

[0056] It should be noted that, in the present embodiment, when in working state, the adapting surface 18 and the blade plate 24 are in contact with each other, and the printing consumables in the molten state inside the blade plate 24 are sealed by the adapting surface 18 to avoid leakage. Of course, the adapting surface 18 and the blade plate 24 may not be in contact with each other, and the printing consumables in the molten state inside the blade plate 24 will drip onto the surface of the adapting surface 18 to avoid residual drawing on the surface of the printed part or the work surface. The specific state between the adapting surface 18 and the blade plate 24 can be adjusted according to actual usage conditions and usage requirements, and no further limitation is made here.

[0057] In this embodiment, by providing an arc-shaped matching surface 18 at the lower end of the nozzle 14 , it is possible to prevent the blade 24 from colliding with the lower end of the nozzle 14 during rotation, causing the blade 24 to be unable to fit with the bottom of the nozzle 14 .

[0058] In a preferred embodiment, the motor 21 is a high temperature resistant servo motor.

[0059] In this embodiment, during the 3D printing operation, the heating plate 13 is heated by the electric heating block 16, so that the temperature inside the heating plate 13 is relatively high. By adopting a motor 21 with high temperature resistance, it is possible to ensure that the motor 21 operates normally inside the high temperature heating plate 13, thereby extending the service life of the motor 21. Specifically, in this embodiment, the allowable working environment temperature range of the motor 21 is -40°C to 300°C. Of course, the specific high temperature resistance performance of the motor 21 can be replaced according to the actual use environment temperature to adapt to the actual use environment, and no specific limitation is made here.

[0060] Next, please refer to Fig.10 The chip collecting part 30 includes a wind nozzle 31, a collecting pipe 32 and a stripping knife 33. The wind nozzle 31 is fixed at the lower end of the heating plate 13. An air inlet 34 is provided at one end of the wind nozzle 31, and the air inlet 34 extends to the inside of the receiving groove 17. The collecting pipe 32 is fixed to the upper end of the wind nozzle 31, and the upper end of the collecting pipe 32 passes through the heating plate 13 and extends to the upper end of the heating plate 13. The stripping knife 33 is fixed in the receiving groove 17 and is located at the upper end of the air inlet 34, and the stripping knife 33 and the knife plate 24 are adapted.

[0061] Here, the fan module and the collecting pipe 32 are connected via a pipeline, and a collecting box is provided inside the fan module.

[0062] In this embodiment, after the 3D printing operation is stopped, the motor 21 is started, so that the motor 21 drives the blade 24 to change from the initial state to the working state, and the blade 24 solves the problem of wire drawing caused by leakage of printing consumables inside the nozzle 14. When the blade 24 moves to the lower end of the nozzle 14, the molten printing consumables leak on the surface of the blade 24. When the 3D printing operation is performed again, the fan module is started, so that the air near the air inlet 34 flows to the fan module through the air nozzle 31 and the collection pipe 32 in turn, and the reverse The motor 21 is operated to drive the blade 24 from the working state to the initial state, so that the blade 24 rotates from the lower end of the nozzle 14 to the inside of the storage groove 17. When the blade 24 contacts the stripping knife 33, the stripping knife 33 strips off the printing consumables remaining on the surface of the blade 24, and the stripped printing consumables are collected through the air inlet 34, so that the stripped printing consumables enter the mobile phone box through the air nozzle 31, the collection tube 32 and the fan module, and then the printing consumables stripped from the surface of the blade 24 are collected.

[0063] Please refer again Fig.10 Both sides of the upper end of the air nozzle 31 are inclined with guide surfaces 35 , and the intersection of the two guide surfaces 35 in the extension direction is located inside the collecting pipe 32 .

[0064] In this embodiment, the guide surface 35 can guide the printing consumables entering the air nozzle 31 to prevent the peeled printing consumables from failing to smoothly enter the collection box when the wind pressure is too high.

[0065] Please refer again Fig.11 A stripping edge 36 is formed at one end of the stripping knife 33 away from the nozzle 14 , and a plurality of dividing edges 37 are evenly formed at the lower end of the stripping knife 33 .

[0066] In this embodiment, during the process of the knife plate 24 changing from the working state to the initial state, when the knife plate 24 and the stripping knife 33 come into contact, the printing consumables on the surface of the knife plate 24 can be segmented through the cooperation of the knife plate 24 and the dividing edge 37 to avoid their large size. When the knife plate 24 and the stripping edge 36 come into contact, the printing consumables remaining on the surface of the knife plate 24 are stripped by the stripping edge 36. Through the cooperation of the knife plate 24, the stripping edge 36 and the dividing edge 37, the printing consumables remaining on the surface of the knife plate 24 can be effectively segmented and stripped.

[0067] In a preferred embodiment, the distance between two adjacent dividing edges 37 is denoted as D1, the inner diameter of the collecting tube 32 is denoted as D2, and D1<D2.

[0068] In this embodiment, the above-mentioned arrangement can avoid limiting the size of the divided printing consumables and avoid the divided printing consumables from causing blockage inside the collection tube 32, so that the divided printing consumables can be smoothly collected into the collection box.

[0069] In a preferred embodiment, the material of the air nozzle 31 and the collecting tube 32 has low thermal conductivity.

[0070] In this embodiment, after the fan is started, the air outside the heating plate 13 will flow through the inside of the air nozzle 31 and the collecting tube 32. The low thermal conductivity of the air nozzle 31 and the collecting tube 32 can prevent the flowing gas from absorbing the heat of the heating plate 13 and causing the temperature inside the heating plate 13 to drop.

[0071] A 3D printer based on fused deposition includes a 3D printing nozzle according to any one of the above items, including an XYZ three-axis moving module and a control module, wherein the control module and the XYZ three-axis moving module are electrically connected via a wire, and a base 10 is assembled on the XYZ three-axis moving module.

[0072] Furthermore, the control module and the motor 21 as well as the control module and the electric heating block 16 are electrically connected via wires.

[0073] Embodiment 2

[0074] This embodiment is further optimized on the basis of the first embodiment, and the difference is only in the installation position of the motor 21, specifically:

[0075] See also Fig.13 As shown, the motor 21 is fixed to one side of the heating plate 13. Through this arrangement, the working environment temperature of the motor 21 can be effectively reduced and the service life of the motor 21 can be extended. In this embodiment, the allowable working environment temperature range of the motor 21 is -40°C to 150°C.

[0076] The working principle of the present invention is:

[0077] See also Figure 8 and Fig.12As shown, when performing 3D printing, the electric heating block 16 is started to heat the heating plate 13 and the nozzle 14, and the feeding unit 11 is started. The consumables are transported to the inside of the nozzle 14 through the throat 15 through the feeding unit 11 for heating. The heated and molten printing consumables are extruded from the inside of the nozzle 14 to perform the 3D printing operation. When the nozzle 14 needs to be moved to a new position for printing, or when the nozzle 14 needs to be reset after printing, the feeding unit 11 is reversed to withdraw the printing consumables through the feeding unit 11 to prevent the printing consumables from continuing to be added. At the same time, the multi-axis motion platform is started, and the base 10, the nozzle 14, the anti-leakage part 20 and the chip collecting part 30 are driven to move by the multi-axis motion platform, so that the nozzle 14 moves away from the print workpiece until the minimum distance between the nozzle 14 and the print workpiece is greater than the distance from the nozzle 14 to the bottom of the knife plate 24. During the movement of the nozzle 14, the molten printing consumables inside the nozzle 14 leak and draw. The motor 21 is started, so that the motor 21 drives the first linkage arm 22 and the knife plate 24 to rotate, so that the knife plate 24 is moved out of the storage groove 17. The blade 24 rotates to the lower end of the nozzle 14. During the rotation of the blade 24, when the cutting edge on the blade 24 contacts the wire drawing, the blade 24 can cut the wire drawing through the cooperation of the nozzle 14 and the cutting edge. At the same time, after the blade 24 moves to the lower end of the nozzle 14, it can effectively prevent the leaked molten consumables from dripping onto the printed part or the work surface to form wire drawing. After the nozzle 14 moves to the target position, when it is necessary to print again, the feed unit 11 is started to transport the printing consumables to the inside of the nozzle 14 again, and the fan module is started. At the same time, the reverse rotation The motor 21 is driven, so that the motor 21 drives the first linkage arm 22 and the knife plate 24 to reset, so that the knife plate 24 rotates from the lower end of the nozzle 14 to the inside of the storage groove 17, and the nozzle 14 can perform 3D printing operations. At the same time, when the knife plate 24 and the stripping knife 33 are in contact, the printing consumables remaining on the surface of the knife plate 24 are divided and stripped through the cooperation of the stripping edge 36 and the dividing edge 37. The printing consumables stripped from the surface of the knife plate 24 are collected by the fan module, which can prevent the stripped printing consumables from being scattered on the surface of the printed part and the work surface.

[0078] The above are only preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the art unless otherwise specified and limited.

Claims

1. A 3D printing nozzle, comprising a base (10), one end of the base (10) being equipped with a feed unit (11), the other end of the base (10) being equipped with a heat dissipation unit (12), the lower end of the base (10) being equipped with a heating plate (13), the lower end of the heating plate (13) being threadedly connected with a nozzle (14), a throat (15) being arranged between the base (10) and the heating plate (13), and the feed unit (11) and the throat (15) as well as the nozzle (14) and the throat (15) are mutually adapted, and one side of the interior of the heating plate (13) is equipped with an electric heating block (16), characterized in that: The heating plate (13) is provided with a receiving groove (17) inside, and further comprises: an anti-leakage portion (20), the anti-leakage portion (20) being mounted inside the heating plate (13), the anti-leakage portion (20) comprising a motor (21), a first linkage arm (22), a second linkage arm (23) and a knife plate (24), the motor (21) being fixed inside the heating plate (13) and being located on one side of the nozzle (14), the first linkage arm (22) being fixed to the output end of the motor (21), and the first linkage arm (22) being rotatably connected to the heating plate (13), the second linkage arm (23) being rotatably connected to the heating plate (13) and being located on the other side of the nozzle (14), the knife plate (24) being fixed at the lower ends of the first linkage arm (22) and the second linkage arm (23), and the knife plate (24) being adapted to the nozzle (14), and a cutting edge being provided at one end of the knife plate (24) close to the nozzle (14); A chip collecting portion (30), the chip collecting portion (30) being assembled inside the base (10), and the chip collecting portion (30) and the blade (24) being matched; Wherein, in the initial state, the knife plate (24) is located inside the receiving groove (17), and in the working state, the knife plate (24) is located at the lower end of the nozzle (14); The chip collecting portion (30) comprises an air nozzle (31), a collecting pipe (32) and a stripping knife (33); the air nozzle (31) is fixed to the lower end of the interior of the heating plate (13); an air inlet (34) is provided at one end of the air nozzle (31), and the air inlet (34) extends into the interior of the receiving groove (17); the collecting pipe (32) is fixed to the upper end of the air nozzle (31), and the upper end of the collecting pipe (32) passes through the heating plate (13); the stripping knife (33) is fixed to the interior of the receiving groove (17) and is located at the upper end of the air inlet (34), and the stripping knife (33) and the knife plate (24) are matched; Both sides of the upper end of the air nozzle (31) are provided with guide surfaces (35) which are inclined, and the intersection point of the two guide surfaces (35) in the extension direction is located inside the collecting pipe (32); A stripping edge (36) is formed at one end of the stripping knife (33) away from the nozzle (14), and a plurality of dividing edges (37) are evenly formed at the lower end of the stripping knife (33); The distance between two adjacent dividing cutting edges (37) is recorded as D1, and the inner diameter of the collecting tube (32) is recorded as D2, where D1<D2.

2. A 3D printing nozzle according to claim 1, characterized in that: The cross-sectional shape of the knife plate (24) is arc-shaped, and a matching surface (18) is provided at the lower end of the nozzle (14), the matching surface (18) is arc-shaped, and the matching surface (18) and the knife plate (24) are matched.

3. A 3D printing nozzle according to claim 1, characterized in that: The motor (21) is a high temperature resistant servo motor.

4. A 3D printing nozzle according to claim 1, characterized in that: The material of the air nozzle (31) and the collecting tube (32) has low thermal conductivity.

5. A 3D printer based on fused deposition, comprising a 3D printing nozzle according to any one of claims 1 to 4, characterized in that: It comprises an XYZ three-axis moving module and a control module, wherein the control module and the XYZ three-axis moving module are electrically connected via a wire, and the base (10) is mounted on the XYZ three-axis moving module.

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