Jet-assisted direct writing device and method

Abstract

The invention relates to the technical field of additive manufacturing, and discloses a jet-assisted direct writing device and method. The device comprises a frame body, a jet-assisted direct-writing printing head and a printing platform, the jet-assisted direct-writing printing head is integrated with a direct-writing charging barrel, three piezoelectric ceramic jet nozzles distributed at 120 degrees and a rotating device, and the rotating device realizes accurate switching of the nozzles through motor gear transmission; the printing platform has X-axis and Y-axis rotating and lifting functions and is matched with the printing head to realize five-axis printing; and the direct-writing charging barrel is provided with an exhaust valve to ensure stable extrusion of materials. The method comprises two working modes: when powder is directly written, the nozzle sprays an adhesive to realize structure fixation, and when slurry is directly written, the nozzle sprays and supplements the slurry to improve the precision. Through precise spraying assistance and five-axis linkage, the machining efficiency and precision are both considered, the machining capacity of a complex structure is expanded, the forming quality is stable, and the precise additive manufacturing device is suitable for precise additive manufacturing of various materials.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and specifically to a jet-assisted direct writing device and method. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] In the field of modern additive manufacturing, direct-write technology is widely used in the molding and processing of complex structural parts due to its ability to achieve directional material deposition. However, existing direct-write technologies have significant limitations: when directly writing extruded slurry, the material range is limited, requiring high solids content to maintain the shape; during direct-write extrusion, the molding accuracy is difficult to improve due to the limitations of the extrusion mechanism. Furthermore, the printing platforms of existing direct-write devices are mostly fixed three-degree-of-freedom designs, which cannot meet the processing requirements of complex curved surfaces and irregular structures, resulting in a limited range of part molding capabilities.

[0004] Some patents for assisted direct writing have been disclosed in the prior art. For example, patent CN118544587A discloses a local charge-assisted electrospinning direct writing 3D stacking printing device and method; patent CN117261218A discloses a gas-assisted pen ink direct writing ink extrusion device and its usage method; and patent CN116353212A discloses a pneumatic pressure-assisted piezoelectric vibration direct writing inkjet pen device and its application. However, these technologies are still based on a single material output method.

[0005] Existing technologies also disclose some direct-write multi-material composite 3D printing systems and methods. For example, patent CN113561484A discloses a direct-write multi-material composite 3D printing system and method; and patent CN110614767A discloses a solid-liquid material combined dual-nozzle 3D printer and its printing method. However, these printers use multiple direct-write nozzles to extrude different materials separately, that is, they combine multiple direct-write nozzles. The multiple direct-write nozzles are in a parallel relationship, and each nozzle performs "single" extrusion molding. This still has the problems of narrow material compatibility and insufficient precision guarantee. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a jet-assisted direct writing device and method. This invention, through the integrated design of "direct writing + precise jet assistance" and five-axis linkage, can realize real-time forming of "direct writing extrusion + adhesive jetting", with a wider range of materials and synergistic improvement in processing capability and forming accuracy. That is, it improves the accuracy, efficiency and structural stability of direct writing forming and expands the processing capability of complex structures.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides an inkjet-assisted direct writing device, comprising a frame, on which an inkjet-assisted direct writing printhead and a printing platform are mounted. The inkjet-assisted direct writing printhead is slidably connected to the frame via a linear bearing, and an X-axis drive device and a Y-axis drive device are provided on the frame to drive the inkjet-assisted direct writing printhead to move in the XY plane. The inkjet-assisted direct writing printhead includes a direct writing mechanism, a piezoelectric ceramic inkjet mechanism, and a rotation drive device. The direct writing mechanism includes a direct writing cylinder. The piezoelectric ceramic inkjet mechanism includes multiple piezoelectric ceramic inkjet nozzles, each nozzle being connected to a corresponding piezoelectric ceramic inkjet part supply hose to deliver adhesive or supplementary slurry. The piezoelectric ceramic inkjet nozzles are connected to a piezoelectric ceramic inkjet nozzle rotation device via bearings, and the piezoelectric ceramic inkjet nozzle rotation device drives the piezoelectric ceramic inkjet nozzles to rotate around the direct writing cylinder. The printing platform can move in the Z direction and rotate in the X and Y directions.

[0008] As a further technical solution, the direct writing mechanism also includes a drive motor, a screw and a direct writing cylinder. The direct writing cylinder and the screw are connected by bearings. The screw and the drive motor are fixedly connected to drive the screw to rotate. The top of the direct writing cylinder is connected to the direct writing part feeding hose. The other end of the direct writing part feeding hose is connected to an external storage device for conveying powder or slurry.

[0009] As a further technical solution, an exhaust valve is provided on the side wall of the direct writing barrel. The exhaust valve can discharge the air in the barrel and ensure stable material extrusion by the screw rotation shearing. As a further technical solution, the piezoelectric ceramic jet nozzle rotating device includes a piezoelectric drive motor, a gear, a gear ring, and a rotating disk. The drive motor is fixed on the housing of the jet-assisted direct writing printhead, and its output shaft is fixedly connected to the gear. The gear meshes with the gear ring, and the gear ring is mounted on the rotating disk. Multiple piezoelectric ceramic jet nozzles are arranged at the bottom of the rotating disk.

[0010] As a further technical solution, the direct writing barrel passes through the center of the piezoelectric ceramic jet nozzle rotating device and extends to the bottom of the piezoelectric ceramic jet nozzle rotating device.

[0011] As a further technical solution, the printing platform includes a support frame, which is connected to a Z-axis linear drive device. An X-axis rotation drive motor is provided on the support frame, which drives the fixed frame to swing along the X direction. A Y-axis rotation drive motor is also provided on the fixed frame. The Y-axis rotation drive motor meshes with an arc-shaped internal gear through a gear, and the end of the internal gear is fixedly connected to the platform body. As a further technical solution, the fixing frame includes a first semicircular bracket and a second semicircular bracket arranged in a cross shape, wherein the first semicircular bracket is arranged along the X direction and the second semicircular bracket is arranged along the Y direction.

[0012] As a further technical solution, the support frame is provided with a first bearing support seat and a second bearing support seat. A first bearing is provided in the first bearing support seat and a second bearing is provided in the second bearing support seat. The drive shaft of the X-axis rotation drive motor is connected to one end of the first semi-circular bracket through a connecting shaft, and the connecting shaft is supported by the first bearing. The other end of the first semi-circular bracket is rotatably connected to the second bearing through the connecting shaft.

[0013] As a further technical solution, the arc-shaped internal gear is installed on the inner side of the first semi-circular bracket, and its two ends are fixedly connected to the platform body.

[0014] As a further technical solution, the Y-axis rotation drive motor is mounted on the crossbeam of the second semi-circular bracket via a connecting plate.

[0015] As a further technical solution, the two ends of the second semi-circular bracket are connected to the platform body via a Y-axis rotation.

[0016] Secondly, the present invention provides a method for operating the above-mentioned jet-assisted direct writing device, comprising two methods: powder direct writing and bonding molding, and slurry direct writing accuracy compensation molding. In the powder direct writing and bonding molding method, the direct writing cylinder moves along the path to extrude powder, the nozzle rotates to a designated position to spray adhesive, and the platform performs five-axis linkage to form layers one by one. In the slurry direct writing accuracy compensation molding method, the print head moves along the path to extrude slurry, the nozzle rotates to a designated position to spray supplementary slurry, and the platform performs five-axis linkage to form layers one by one. The beneficial effects of this invention are as follows: The jet-assisted direct writing device of this invention, through the integrated design of "direct writing + precise jet assistance" and five-axis linkage, can realize real-time forming of "direct writing extrusion + adhesive jetting", with a wider range of materials and synergistic improvement in processing capability and forming accuracy. Specifically, multiple piezoelectric ceramic jetting nozzles are arranged evenly around the direct writing mechanism. The multiple piezoelectric ceramic jetting nozzles, together with the gear-driven rotation device, can quickly and accurately position the nozzles to the rear of the direct writing mechanism, improving the jetting response speed and alignment accuracy, and ensuring the accuracy of bonding or supplementary printing. The printing platform integrates X-axis and Y-axis axial rotation and lifting functions, which, together with the movement of the jet-assisted direct writing printhead, realize five-axis printing, greatly expanding the processing capability of complex curved surfaces and irregular structures. The two working modes of the jet-assisted direct writing device proposed in this invention are adapted to powder and slurry direct writing scenarios respectively. It not only solves the material limitation problem of powder direct writing, but also makes up for the accuracy defects of slurry direct writing, thereby improving the material range and accuracy. The direct-write barrel of this invention is equipped with an exhaust valve to avoid uneven material extrusion caused by residual air, thereby further ensuring molding quality. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 , Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the jet-assisted direct-write printhead portion of Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the interior (hidden shell) of the jet-assisted direct-write printhead portion in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the piezoelectric ceramic jet nozzle rotating device of Embodiment 1 of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the piezoelectric ceramic jet nozzle rotating device (top view) according to Embodiment 1 of the present invention. Figure 2 ; Figure 7 , Figure 8 This is a schematic diagram of the direct-write portion of Embodiment 1 of the present invention; Figure 9 , Figure 10 Schematic diagram of the printing platform in Embodiment 1 of the invention; Figure 11 This is a schematic diagram of the platform X-axis and Y-axis rotation fixing frame of Embodiment 1 of the present invention; Figure 12 This is a schematic diagram of the support frame according to Embodiment 1 of the present invention; The components include: 1. Frame; 2. Injection-assisted direct-write printhead; 211. Outer shell; 3. Printing platform; 4. Direct-write section feed hose; 5. Piezoelectric ceramic injection mechanism feed hose; 6. Linear bearing; 7. Screw drive motor; 8. Screw; 9. Direct-write cylinder; 10. Piezoelectric ceramic injection device; 11. Piezoelectric ceramic injection nozzle rotation device; 12. Bearing; 13. Piezoelectric ceramic injection nozzle; 14. Gear; 15. Piezoelectric ceramic injection nozzle rotation device drive motor; 16. Exhaust valve. 17. Support frame; 171. First bearing support seat; 172. First bearing support seat; 18. X-axis rotation drive motor; 19. Platform body; 20. Arc-shaped internal gear; 21. Y-axis rotation drive gear; 22. Y-axis rotation drive motor; 23. Fixture; 231. First semi-circular bracket; 232. Second semi-circular bracket; Detailed Implementation It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] In this embodiment, the five axes refer to: the linear motion of the jet-assisted direct-write printhead in the X and Y directions; and the ability of the printing platform to move in the Z direction and rotate in the X and Y directions.

[0021] As described in the background section, the existing technology has shortcomings. To address the above-mentioned technical problems, this invention proposes an jet-assisted direct writing device and method. It employs multiple uniformly distributed piezoelectric ceramic jet nozzles, coupled with a gear-driven rotation device, which can quickly and accurately position the nozzles directly behind the direct writing path, improving jet response speed and alignment accuracy, and ensuring the accuracy of bonding or supplementary printing. The printing platform integrates X-axis and Y-axis axial rotation and lifting functions, which, in conjunction with the movement of the jet-assisted direct writing print head, achieve five-axis printing, significantly expanding the processing capabilities for complex curved surfaces and irregular structures.

[0022] Example 1 This embodiment provides an inkjet-assisted direct writing device, such as... Figures 1-12As shown, the device includes a frame 1, which provides support for the entire device. X and Y direction drive devices are fixedly mounted on the frame 1. These drive devices are slidably connected to the jet-assisted direct-write printhead 2 via four linear bearings 6. The forward and reverse rotation of the drive motors of the X and Y direction drive devices causes the jet-assisted direct-write printhead 2 to move planar along the frame 1 in the XY plane. See details... Figure 1 , Figure 2 The X and Y direction driving device in this embodiment is a belt driving device, which has the same structure as the prior art, so it will not be described in detail in this embodiment. Furthermore, a printing platform 3 is provided below the jet-assisted direct-write printhead 2. The printing platform can move in the Z direction and rotate in the X and Y directions.

[0023] Furthermore, in this embodiment, the jet-assisted direct-write printhead 2 integrates a direct-write mechanism, a piezoelectric ceramic jetting mechanism, and a piezoelectric ceramic jetting printhead rotating device 11. The core components of the direct writing mechanism are the drive motor 7, the screw 8, and the direct writing cylinder 9. The direct writing cylinder 9 and the screw 8 are connected by bearings. The screw 8 is fixedly connected to the drive motor 7 to drive the screw 8 to rotate. The top of the direct writing cylinder 9 is connected to the direct writing part feeding hose 4. The other end of the direct writing part feeding hose 4 is connected to an external storage device for conveying powder or slurry. The side wall of the direct writing cylinder 9 is provided with an exhaust valve 16, which can discharge the air in the cylinder and ensure stable material extrusion by the rotation and shearing of the screw 8. Furthermore, the piezoelectric ceramic jetting mechanism includes three piezoelectric ceramic jetting nozzles 13, which are evenly distributed at 120° along the circumference. Each nozzle is connected to a piezoelectric ceramic jetting mechanism supply hose 5 to deliver adhesive or supplementary slurry. The piezoelectric ceramic jetting nozzles 13 are connected to the piezoelectric ceramic jetting nozzle rotating device 11 through bearings 12 to achieve flexible rotation.

[0024] The piezoelectric ceramic jet nozzle rotating device 11 includes a piezoelectric ceramic jet nozzle rotating device drive motor 15 and a gear 14. The drive motor 15 is fixed on the housing 211 of the jet-assisted direct writing printhead 2. The output shaft of the drive motor 15 is fixedly connected to the gear 14. The gear 14 meshes with the gear ring at the tail of the piezoelectric ceramic jet nozzle rotating device 11. When the drive motor 15 starts, it drives the piezoelectric ceramic jet nozzle 13 to rotate around the bearing 12 through the gear 14. It can accurately switch any nozzle to the position directly behind the direct writing outlet end of the direct writing cylinder 9, with a switching response time ≤0.5s. The direct writing cylinder 9 passes through the center of the piezoelectric ceramic jet nozzle rotating device 11 and extends to the bottom of the piezoelectric ceramic jet nozzle rotating device 11; The jet-assisted direct writing device in this embodiment uses multiple evenly distributed piezoelectric ceramic jet nozzles, combined with a gear-driven rotation device, to quickly and accurately position the nozzles directly behind the direct writing path, improving jet response speed and alignment accuracy, and ensuring the accuracy of bonding or supplementary printing; the printing platform integrates X-axis and Y-axis axial rotation and lifting functions, which, in conjunction with the movement of the jet-assisted direct writing print head, achieve five-axis printing, greatly expanding the processing capabilities for complex curved surfaces and irregular structures; Furthermore, such as Figure 9 , Figure 10 As shown, in this embodiment, the printing platform 3 is located below the jet-assisted direct-write printhead 2, and includes a platform body 19, a support frame 17, an X-axis rotation drive motor 18, a Y-axis rotation drive motor 22, an arc-shaped internal gear 20, a Y-axis rotation drive gear 21, and a fixing frame 23. The support frame 17 is connected to the frame 1 by a screw lifting structure. The printing platform 3 is driven to rise and fall vertically by the Z-axis drive motor to adjust the printing height. The X-axis rotation drive motor 18 is fixed on the platform 3, and its output shaft is connected to the platform fixing frame 23, driving the platform fixing frame 23 to rotate around the X-axis, thereby driving the platform body 19 to rotate around the X-axis, with a rotation angle range of ±30°. The Y-axis rotation drive motor 22 is fixed on the platform mounting frame 23. Its output shaft is connected to the Y-axis rotation drive gear 21. The drive gear 21 meshes with the platform Y-axis rotation transmission internal gear 20. The transmission internal gear 20 is fixed to the platform body 19, driving the platform body 19 to rotate around the Y-axis with a rotation angle range of ±30°. The platform fixing frame 23 in this embodiment has the following structure: Figure 11 As shown, it includes a first semicircular bracket 231 and a second semicircular bracket 232 arranged in a cross shape. The first semicircular bracket 231 is arranged along the X direction, and the second semicircular bracket 232 is arranged along the Y direction.

[0025] Furthermore, such as Figure 12 As shown, the support frame 17 is provided with a first bearing support seat 171 and a second bearing support seat 172. A first bearing is provided in the first bearing support seat 171 and a second bearing is provided in the second bearing support seat 172. The drive shaft of the X-axis rotation drive motor is connected to one end of the first semi-circular bracket 231 through a connecting shaft, and the connecting shaft is supported by the first bearing. The other end of the first semi-circular bracket 231 is rotatably connected to the second bearing through the connecting shaft.

[0026] As a further technical solution, the arc-shaped internal gear 20 is installed on the inner side of the first semi-circular bracket 231, and its two ends are fixedly connected to the platform body.

[0027] As a further technical solution, the Y-axis rotation drive motor is mounted on the crossbeam of the second semi-circular bracket 232 via a connecting plate.

[0028] As a further technical solution, the two ends of the second semi-circular bracket are connected to the platform body 19 via a Y-axis rotation.

[0029] In this embodiment, the diameter of the discharge end of the direct writing cylinder 9 is 0.1-0.3mm, the nozzle diameter of the piezoelectric ceramic jet nozzle 13 is 0.01-0.05mm, the positioning accuracy of the printing platform 19 can reach ±10μm, the repeatability of the positioning accuracy is ±5μm, and the processing size range is length × width × height = 220mm × 220mm × 200mm.

[0030] Example 2 This embodiment provides a method for operating the above-mentioned jet-assisted direct writing device, including two operating modes: Method 1: Powder direct writing and bonding molding 1. Equipment debugging: Check the tightness of the connections of each component, introduce compressed air into the direct writing cylinder 9 through the direct writing section feed hose 4, and test the sealing performance of the exhaust valve 16; start the drive motor 15 of the piezoelectric ceramic jet nozzle rotation device, test the switching flexibility and positioning accuracy of the three nozzles, and ensure that the nozzles can be accurately aligned with the rear of the direct writing output end; debug the X-axis and Y-axis rotation functions of the printing platform 3 to ensure smooth movement.

[0031] 2. Material preparation: Load the target powder (such as metal powder or ceramic powder) into the external storage device, and feed the powder to the direct writing cylinder 9 through the direct writing section feed hose 4. Expel the air in the cylinder through the exhaust valve 16. Load the adhesive (such as resin-based adhesive) into the storage device of the piezoelectric ceramic jetting mechanism, and fill the nozzle pipeline through the feed hose 5.

[0032] 3. Processing settings: Import the 3D model of the part into the control system. The system plans the direct writing path and the spraying path. Set the direct writing speed to 5-10mm / s, the powder extrusion amount to 0.1-0.5g / s, the adhesive spraying pressure to 0.1-0.3MPa, and the lifting step distance of the printing platform 3 to 0.05-0.2mm.

[0033] 4. Molding Processing: The X and Y axis drive motors are activated, driving the jet-assisted direct-write printhead 2 to move along the set path. At the same time, the screw drive motor 7 is activated, continuously rotating and shearing to ensure that the direct-write cylinder 9 continuously extrudes powder, forming the initial powder path. Simultaneously, the control system controls the piezoelectric ceramic jet nozzle rotation device drive motor 15 to start according to the path direction. Through gear 14, the corresponding nozzle is rotated to the rear of the direct-write discharge end, spraying adhesive into the powder path to achieve fixation between layers and between paths. The printing platform 3 adjusts its posture through the X and Y axis rotation mechanisms, cooperating with the printhead movement to achieve five-axis linkage, stacking and forming layer by layer until the entire part processing is completed.

[0034] 5. Post-processing: After processing, the parts are removed and subjected to post-processing such as degreasing and sintering to remove adhesives and improve the density of the parts.

[0035] Method 2: Slurry direct writing accuracy compensation molding 1. Equipment debugging: Same as the steps in Method 1 of Example 2.

[0036] 2. Material preparation: Load the printing paste (such as polymer paste or ceramic paste) into the storage device of the direct writing section, and deliver the paste to the direct writing cylinder 9 through the feed hose 4, and exhaust the air through the exhaust valve 16; load the high-precision replenishment paste of the same composition into the storage device of the piezoelectric ceramic jetting mechanism, and fill the nozzle pipeline through the feed hose 5.

[0037] 3. Processing settings: Import the 3D model of the part, plan the direct writing path and the compensation jetting path, set the direct writing speed to 8-15mm / s, the slurry extrusion volume to 0.2-0.8g / s, the supplementary slurry jetting pressure to 0.08-0.2MPa, and adjust the rotation angle of the printing platform 3 in real time according to the surface requirements of the part.

[0038] 4. Molding Processing: The X and Y direction drive motors are started, driving the jet-assisted direct writing print head 2 to move along the set path. At the same time, the screw drive motor 7 starts and rotates continuously to shear, ensuring that the direct writing cylinder 9 continuously and evenly extrudes the slurry to form the initial structure. The control system analyzes the accuracy deviation of the direct writing path and controls the piezoelectric ceramic jet nozzle rotation device to switch the nozzle to the position directly behind the direct writing outlet end, spraying supplementary slurry onto the path surface and gaps to compensate for insufficient direct writing accuracy. The printing platform 3 adjusts the part posture through five-axis linkage to ensure that the jetting direction is always consistent with the direct writing path, forming layer by layer until the part is completed.

[0039] 5. Post-processing: After the parts are formed, they undergo post-processing such as curing and drying to remove excess moisture or solvents and improve the strength of the parts.

[0040] In the practical application of this embodiment, method 1 is used to process irregularly shaped ceramic parts. After testing, the dimensional accuracy of the parts reaches ±0.1mm and the structural density is ≥90%. Method 2 is used to process complex curved polymer parts. The dimensional accuracy reaches ±0.03mm and the surface roughness Ra is 0.8μm, which meets the processing requirements of precision parts.

[0041] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A jet-assisted direct writing device, comprising a frame, characterized in that, The frame is equipped with an inkjet-assisted direct writing printhead and a printing platform. The inkjet-assisted direct writing printhead is slidably connected to the frame via a linear bearing. An X-axis drive device and a Y-axis drive device are provided on the frame to drive the inkjet-assisted direct writing printhead to move in the XY plane. The inkjet-assisted direct writing printhead includes a direct writing mechanism, a piezoelectric ceramic inkjet mechanism, and a rotation drive device. The direct writing mechanism includes a direct writing cylinder; the piezoelectric ceramic jetting mechanism includes multiple piezoelectric ceramic jetting nozzles, each nozzle being connected to a corresponding piezoelectric ceramic jetting part supply hose to deliver adhesive or supplementary slurry. The piezoelectric ceramic jetting nozzles are connected to a piezoelectric ceramic jetting nozzle rotation device via bearings, and the piezoelectric ceramic jetting nozzle rotation device drives the piezoelectric ceramic jetting nozzles to rotate around the direct writing cylinder. The printing platform can move in the Z direction and rotate in the X and Y directions.

2. The jet-assisted direct writing device as described in claim 1, characterized in that, The direct writing mechanism also includes a drive motor, a screw, and a direct writing cylinder. The direct writing cylinder and the screw are connected by bearings, and the screw is fixedly connected to the drive motor to drive the screw to rotate. The top of the direct writing cylinder is connected to the direct writing part feeding hose, and the other end of the direct writing part feeding hose is connected to an external storage device for conveying powder or slurry.

3. The jet-assisted direct writing device as described in claim 1, characterized in that, An exhaust valve is provided on the side wall of the straight writing barrel. The exhaust valve can discharge the air in the barrel, and the screw rotation shears to ensure stable material extrusion.

4. The jet-assisted direct writing device as described in claim 1, characterized in that, The piezoelectric ceramic jet nozzle rotating device includes a piezoelectric drive motor, a gear, a gear ring, and a rotating disk. The drive motor is fixed on the housing of the jet-assisted direct writing printhead, and its output shaft is fixedly connected to the gear. The gear meshes with the gear ring, which is mounted on the rotating disk. Multiple piezoelectric ceramic jet nozzles are arranged at the bottom of the rotating disk.

5. The jet-assisted direct writing device as described in claim 1, characterized in that, The direct writing barrel passes through the center of the piezoelectric ceramic jet nozzle rotating device and extends to the bottom of the piezoelectric ceramic jet nozzle rotating device.

6. The jet-assisted direct writing device as described in claim 1, characterized in that, The printing platform includes a support frame connected to a Z-axis linear drive device. An X-axis rotation drive motor is mounted on the support frame, which drives a fixed frame to swing along the X direction. A Y-axis rotation drive motor is mounted on the fixed frame, and the Y-axis rotation drive motor meshes with an arc-shaped internal gear through a gear. The end of the internal gear is fixedly connected to the platform body.

7. The jet-assisted direct writing device as described in claim 6, characterized in that, The fixing frame includes a first semicircular bracket and a second semicircular bracket arranged in a cross shape. The first semicircular bracket is arranged along the X direction, and the second semicircular bracket is arranged along the Y direction.

8. The jet-assisted direct writing device as described in claim 7, characterized in that, The support frame is provided with a first bearing support seat and a second bearing support seat. A first bearing is provided in the first bearing support seat and a second bearing is provided in the second bearing support seat. The drive shaft of the X-axis rotation drive motor is connected to one end of the first semi-circular bracket through a connecting shaft, and the connecting shaft is supported by the first bearing. The other end of the first semi-circular bracket is rotatably connected to the second bearing through the connecting shaft.

9. The jet-assisted direct writing device as described in claim 7, characterized in that, The arc-shaped internal gear is installed on the inner side of the first semi-circular bracket, and its two ends are fixedly connected to the platform body; the Y-axis rotation drive motor is installed on the crossbeam of the second semi-circular bracket through a connecting plate; the two ends of the second semi-circular bracket are connected to the platform body through a Y-axis rotation shaft.

10. A method of operating the jet-assisted direct writing device according to any one of claims 1-9, characterized in that, There are two types: powder direct writing and bonding molding, and slurry direct writing with precision compensation molding. In the powder direct writing and bonding molding, the direct writing cylinder moves along the path to extrude powder, the nozzle rotates to the designated position to spray adhesive, and the platform forms layers in a five-axis linkage. In the slurry direct writing with precision compensation molding, the print head moves along the path to extrude slurry, the nozzle rotates to the designated position to spray supplementary slurry, and the platform forms layers in a five-axis linkage.

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