Continuous spiral circulating volume printing device

Abstract

The invention discloses a continuous spiral circulating volume printing device, which belongs to the technical field of additive manufacturing and comprises a self-adaptive light source system, a resin circulating system, a resin fine filtering and glowing system and an automatic finished product post-processing system. A DLP projector of the self-adaptive light source system is arranged on a lifting platform, a resin circulating system is provided with a liposuction tube, a resin circulating pump, a hollow shaft motor and a two-way glass tube, the liposuction tube and the two-way glass tube penetrate through an avoiding hole to be inserted into resin, and a resin refined filtration glowing system is arranged on an assembly mounting platform and relatively independently operates. And the automatic finished product post-processing system can realize cleaning and transportation of printed finished products through cooperative movement of the transverse-row screen. The movement of the DLP projector, the motor and other elements is controlled by the computer, and the continuous spiral volume printing and repeated utilization of the resin are realized under the combined action of all the elements, so that the production efficiency and the resin utilization rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and particularly to a continuous spiral cyclic volumetric printing device. Background Art

[0002] As a new 3D printing method, volumetric printing technology draws on the reverse application of computed tomography (CT) imaging technology. By projecting energy onto photosensitive resin through a multi-angle dynamic two-dimensional light pattern, a photocuring reaction occurs in the area where the three-dimensional energy dose distribution exceeds the polymerization threshold, thereby constructing a complete three-dimensional structure at one time, breaking through the efficiency bottleneck of traditional layer-by-layer printing. The chemical basis of this technology is that photoinitiators generate free radicals under specific wavelength light irradiation, trigger monomer polymerization and form a three-dimensional crosslinked network. At the same time, the curing range is controlled by a photo-inhibitor to prevent over-curing of non-target areas. However, the existing volumetric printing materials have low utilization rate: during the printing process, the photoinitiators in the uncured area are irreversibly consumed due to continuous light irradiation, resulting in an imbalance in the concentration of key components (such as photoinitiators and photo-inhibitors) in the remaining resin, and it cannot be directly reused, causing waste of expensive photosensitive resin; the operation continuity is poor: after each printing, the resin container needs to be replaced for the next round of printing, and the process is interrupted frequently, making it difficult to exert the advantage of single-time rapid prototyping of volumetric printing, severely restricting the batch production efficiency; the printing size is limited: limited by the law of light source intensity attenuation and the boundary conditions of the container size, it is difficult for the existing technology to achieve continuous forming of large-size or long-volume objects, and the application range is limited. The above defects make it difficult for the current volumetric printing technology to meet the industrial-level continuous production requirements, and it is urgent to develop a new printing device to improve the resin reuse rate, achieve continuous operation and break through the forming size limit. Summary of the Invention

[0003] The purpose of the present invention is to provide a continuous spiral cyclic volumetric printing device. To solve the problems of difficult extraction of volumetric printing finished products and low utilization rate of photosensitive resin, the present invention designs a continuous spiral cyclic volumetric printing device. After the adaptive light source system completes volumetric printing, the resin fine filtration and rejuvenation system mixes the components of the printed photosensitive resin to make it meet the conditions for volumetric printing again. The resin circulation system transports the treated photosensitive resin to the adaptive light source system for printing again. The finished product automatic post-processing system then completes the transportation, cleaning and storage of the printed finished product. The combination of the four systems can achieve full-process automation, improve the volumetric printing efficiency, and realize the rapid and continuous printing of long-volume three-dimensional objects, while improving the utilization rate of photosensitive resin materials.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A continuous spiral cyclic volume printing device includes four parts: an adaptive light source system, a resin circulation system, a resin fine filtration and rejuvenation system, and a finished product automatic post-processing system. The adaptive light source system and the resin circulation system are arranged on the upper part of the light source system support platform. The resin fine filtration and rejuvenation system is arranged on the lower part of the light source system support platform. The finished product automatic post-processing system is arranged on the left side of the light source system support platform.

[0006] Preferably, the adaptive light source system includes a DLP projector, a plano-convex lens, a light source system lifting platform, a lead screw drive motor, a lead screw, a set screw, a lifting platform, a guide rod, and a light source system fixed seat. The DLP projector is fixed on the light source system fixed seat. The light source system fixed seat is arranged on the chute of the lifting platform and fixed in position by a set screw. The plano-convex lens is arranged on the lifting platform. The lead screw drive motor drives the lead screw to rotate, and the lead screw drives the lifting platform to move vertically along the guide rod. The lead screw and the guide rod are perpendicularly fixed on the light source system support platform.

[0007] Preferably, the resin circulation system includes a resin buffer bottle, a resin supply elbow, a hand-tightening clamp, a resin circulation pump, a suction pipe, a truss, a double-pass glass tube, a sealing flange cover, a light refractive index matching bath, a screw cap, a hollow shaft motor, a truss top plate, an O-ring, a 15mm inner diameter rotary oil seal, a 30mm inner diameter rotary oil seal, a deep groove ball bearing, and a platform support column. The resin circulation pump is fixed on the light source system support platform. The suction end and the discharge end of the resin circulation pump are respectively connected to the suction pipe and the resin supply elbow. The other end of the suction pipe is inserted into the resin in the supply resin tank. The other end of the resin supply elbow is connected to the resin buffer bottle. The resin buffer bottle is arranged on the truss top plate. The top of the hollow shaft motor is connected to the truss top plate by bolts. The bottom of the hollow shaft motor is connected to the screw cap by bolts. The screw cap is threadedly connected to the outside of the upper mouth of the double-pass glass tube. The light refractive index matching bath is fixed on the light source system support platform by the platform support column. The double-pass glass tube passes through the light refractive index matching bath and its bottom sealing flange cover. The 30mm inner diameter rotary oil seal and the deep groove ball bearing installed inside the bottom sealing flange cover cooperate with the double-pass glass tube to form a rotating pair. An avoidance hole is opened on the light source system support platform. The suction pipe and the double-pass glass tube pass through the avoidance hole and are inserted into the resin. The resin circulation pump controls the resin to circulate and flow in the resin circulation system. The hollow shaft motor controls and drives the double-pass glass tube to rotate.

[0008] Preferably, the resin fine filtration and activation system includes a component installation platform, a coarse filter screen, platform support columns, a liquid level sensor, a liquid level sensor, a supply resin tank, a refrigerating metal sheet, a resin peristaltic pump, a resin stirrer, a resin and photo inhibitor stock solution tank, a resin and photo inhibitor stock solution tank cover, a resin and photoinitiator stock solution tank, a resin and photoinitiator stock solution tank cover, a resin stirring and mixing barrel, pipelines, a flip-chip type filter, a hand-tightening clamp, a heater, and a recycled resin tank; the recycled resin tank and the chamber where the heating metal sheet is located are separated by a filter screen, and each tank body is connected to the resin peristaltic pump and the flip-chip type filter through respective pipelines, and the pipeline joints are fixed by hand-tightening clamps; liquid level sensors and temperature sensors are provided on both the recycled resin tank and the supply resin tank; a resin stirrer is installed inside the resin stirring and mixing barrel, and a motor, a heater, and a vibrator are installed at its bottom.

[0009] Preferably, the finished product automatic post-treatment system includes an electric push rod, a connecting component, a sliding push block, an electric push rod support seat, a drying fan, a right connecting slider, a right sprocket rack, a right moving frame, a right screen rack, a left stepping motor, an ultraviolet curing lamp, an ultrasonic cleaning tank, a right chain, a right sprocket set, a right horizontal row of screens, a left sprocket rack, a left sprocket set, a left moving frame, a left screen rack, a right stepping motor, a printed product storage box, a left horizontal row of screens, a left chain, and a left connecting slider; the electric push rod is fixed on the component installation platform through the electric push rod support seat, its push rod head is connected to the connecting component through bolts, and the connecting component is further rigidly connected to the sliding push block through screws to form a linear moving pair, and a sealing device is provided at the connection between the sliding push block and the recycled resin tank; the right screen transportation mechanism composed of a right connecting slider, a right sprocket rack, a right moving frame, a right screen rack, a right stepping motor, a right chain, a right sprocket set, and a right horizontal row of screens, the right horizontal row of screens is fixed to the right screen rack through screws, and the right screen rack is connected to the right connecting slider through bolts; the right connecting slider passes through the rectangular hole of the right moving frame and is hinged to the inner and outer link plates of the right chain through stud bolts, the right stepping motor is fixed on the right sprocket rack through bolts, the driving sprocket of the right sprocket set is connected to the output shaft of the right stepping motor through a key, the driven sprocket of the right sprocket rack is installed at the other end of the right sprocket rack after being fitted with a bearing, and the right chain is tensioned between the two sprockets; the left screen transportation mechanism composed of a left connecting slider, a left sprocket rack, a left moving frame, a left screen rack, a left stepping motor, a left chain, a left sprocket set, and a left horizontal row of screens has the same installation position and connection relationship as the right screen transportation mechanism, and the nylon columns on the installed left horizontal row of screens and right horizontal row of screens are arranged in a staggered manner to ensure that there is no interference when the nylon column parts of the horizontal row of screens cross each other.

[0010] Preferably, the ultrasonic cleaning tank is arranged between two sprocket racks, filled with 99% alcohol, and integrated with an ultrasonic generating device; the nylon columns of the printed product storage box and those of the left horizontal screen are arranged staggeredly to ensure that the nylon column parts of the two can pass through each other without interference; the drying fan is installed on the right side of the right sprocket rack; the irradiation area of the ultraviolet curing lamp covers the main body of the printed product storage box.

[0011] Preferably, the central axes of the DLP projector, plano-convex lens, light refractive index matching bath, and double-pass glass tube are in the same plane.

[0012] Preferably, the bottom opening of the resin buffer bottle passes through the hollow shaft of the hollow shaft motor and inserts into the inner ring of a 15-mm inner diameter rotary oil seal. The outer ring of the 15-mm inner diameter rotary oil seal is fixed in the central hole of the screw cap. When the hollow shaft motor rotates, it drives the screw cap, 15-mm inner diameter rotary oil seal, and double-pass glass tube to rotate. The 15-mm inner diameter rotary oil seal rotates relative to the bottom opening of the resin buffer bottle. An O-ring seal is provided between the installation gap of the screw cap and the hollow shaft motor; the liposuction tube, resin circulation pump, resin supply elbow, resin buffer bottle, screw cap, and all box body pipes are made of non-light-transmitting materials. The non-printing area of the double-pass glass tube is sprayed with light-proof materials. The inner diameter of the double-pass glass tube is 28 mm and the outer diameter is 30 mm.

[0013] Preferably, the angle between the nylon columns on the left horizontal screen and the right horizontal screen and the horizontal plane is 10°, and the nylon columns of the printed product storage box form an angle of 60° with the horizontal plane.

[0014] Preferably, the start and stop of the DLP projector, lead screw drive motor, hollow shaft motor, resin circulation pump, resin peristaltic pump, resin stirring and mixing barrel, left stepping motor, right stepping motor, ultraviolet curing lamp, and drying fan are controlled by a computer.

[0015] The technical beneficial effects of the present invention are as follows:

[0016] 1. The self-adaptive light source system designed in the present invention breaks through the printing size limit: through spiral scanning and industrial CT reconstruction algorithms, it solves the length limit of traditional volume printing in the Z-axis direction and can realize the continuous molding of large-size or long-volume objects; accurately controls the curing range: multi-angle projection combined with a light refractive index matching bath (reducing light refraction loss) ensures accurate three-dimensional energy dose distribution and avoids over-curing of non-target areas; highly automated integration: the lead screw drive motor realizes automatic adjustment of the light source height, reduces manual intervention, and improves the continuity of the printing process.

[0017] 2. The resin circulation system designed by the present invention improves the continuous printing efficiency: through the dynamic cooperation of the resin circulation pump and the double-pass glass tube, it is possible to realize the continuity of the printing process and reduce the downtime without manual replacement of the resin container, which is suitable for mass production; the resin utilization rate is optimized: the uncured resin returns to the fine filtration system through the circulation loop, avoiding direct waste, and combined with the subsequent resin fine filtration and rejuvenation system, significantly improving the material reuse rate; the structure is compact and reliable: non-light-transmitting materials (such as liposuction tubes and resin buffer bottles) and anti-light spraying design prevent accidental curing of the resin caused by light leakage, ensuring the stability of the system.

[0018] 3. The resin fine filtration and rejuvenation system designed by the present invention accurately restores the components: by quantitatively supplementing the stock solutions of high-concentration photoinitiator and photo-inhibitor, it solves the problem of resin component imbalance in traditional volume printing, enabling the remaining resin to be reused; efficiently removes impurities: multi-stage filtration (coarse filter screen + inverted plate filter) removes the cured particles and impurities in the resin, avoiding affecting the subsequent printing quality; intelligent control: the liquid level sensor and temperature sensor monitor the resin state in real time, combined with the peristaltic pump for quantitative pumping, realizing the automatic control of the component recovery process and reducing human error.

[0019] 4. The finished product automatic post-treatment system designed by the present invention is fully automated: the integrated design from finished product collection to cleaning and curing reduces the manual operation steps, improves the production efficiency, and is suitable for industrial mass production; efficient cleaning and curing: ultrasonic cleaning combined with alcohol solvent thoroughly removes the residual resin on the surface of the finished product; the ultraviolet curing lamp ensures sufficient secondary curing and improves the mechanical properties of the finished product; strong structural compatibility: the horizontal row of screen nylon columns are staggered (angle 10° / 60°) to realize the transportation of printed finished products, and can adapt to printed finished products of different sizes and shapes, with high versatility.

[0020] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0022] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 is a structural schematic diagram of the adaptive light source system;

[0024] Figure 3 is a structural schematic diagram of the resin circulation system;

[0025] Figure 4 is Figure 3 a schematic diagram of the rotating structure of the double-pass glass tube in

[0026] Figure 5 is Figure 4 a sectional view of

[0027] Figure 6 is Figure 5 an enlarged view of part A in

[0028] Figure 7 a schematic diagram of the optical refractive index matching bath assembly

[0029] Figure 8 is Figure 7 a sectional view of

[0030] Figure 9 a schematic diagram of the resin fine filtration and activation system structure

[0031] Figure 10 an exploded view of the support platform part of the light source system

[0032] Figure 11 is

[0033] Figure 12 a left rear oblique axonometric view of the cleaning and transportation mechanism

[0034] Figure 13 is

[0035] Figure 14 a schematic diagram of the volume printing chemical reaction

[0036] In the figure: 1. Adaptive light source system; 2. Resin circulation system; 3. Resin fine filtration and rejuvenation system; 1.1. DLP projector; 1.2. Plano-convex lens; 1.3. Light source system support platform; 1.4. Lead screw drive motor; 1.5. Lead screw; 1.6. Set screw; 1.7. Lifting platform; 1.8. Guide rod; 1.9. Light source system fixing seat; 2.1. Resin buffer bottle; 2.2. Resin supply elbow; 2.3. Hand-tightening clamp; 2.4. Resin circulation pump; 2.5. Liposuction tube; 2.6. Truss; 2.7. Double-pass glass tube; 2.8. Sealing flange cover; 2.9. Light refractive index matching bath; 2.10. Screw cap; 2.11. Hollow shaft motor; 2.12. Truss top plate; 2.13. O-ring seal; 2.14. Rotary oil seal with an inner diameter of 15 mm; 2.15. Rotary oil seal with an inner diameter of 30 mm; 2.16. Deep groove ball bearing; 2.17. Platform support column; 3.1. Component installation platform; 3.2. Coarse filter screen; 3.3. Platform support column; 3.4. Liquid level sensor; 3.5. Liquid level sensor; 3.6. Supply resin tank; 3.7. Refrigerating metal sheet; 3.8. Resin peristaltic pump; 3.9. Resin stirrer; 3.10. Resin and photo-inhibitor stock solution tank; 3.10.1. Resin and photo-inhibitor stock solution tank cover; 3.11. Resin and photo-initiator stock solution tank; 3.11.1. Resin and photo-initiator stock solution tank cover; 3.12. Resin stirring and mixing barrel; 3.13. Pipeline; 3.14. Inverted plate filter; 3.15. Hand-tightening clamp; 3.16. Heater; 3.17. Recycled resin tank; 4.1. Electric push rod; 4.2. Connecting component; 4.3. Sliding push block; 4.4. Electric push rod support seat; 4.5. Drying fan; 4.6. Right connecting slider; 4.7. Right sprocket holder; 4.8. Right moving frame; 4.9. Right screen rack; 4.10. Left stepper motor; 4.11. UV curing lamp; 4.12. Ultrasonic cleaning tank; 4.13. Right chain; 4.14. Right sprocket set; 4.15. Right horizontal row screen; 4.16. Left sprocket holder; 4.17. Left sprocket set; 4.18. Left moving frame; 4.19. Left screen rack; 4.20. Right stepper motor; 4.21. Printed product storage box; 4.22. Left horizontal row screen; 4.23. Left chain; 4.24. Left connecting slider. Detailed implementation manners

[0037] The present invention will be further described below in conjunction with the detailed implementation manners. Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which do not represent the sizes of actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0038] Combined with Figures 1 - 14As shown in the figure, an implementation method of continuous spiral cyclic volume printing provided in this embodiment. Before the device starts printing, start the resin circulation pump 2.4, extract resin from the supply resin tank 3.6 and pump it into the resin supply elbow 2.2, fill the resin buffer bottle 2.1 and the double-pass glass tube 2.7, and then pump it out into the recycling resin tank 3.17. After the resin fills the entire loop, and both the suction pipe 2.5 and the bottom of the double-pass glass tube 2.7 are lower than the liquid level height of the resin in the supply resin tank 3.6 and the recycling resin tank 3.17. Due to atmospheric pressure and the resin sealed circulation loop being airtight, the resin in the loop remains stationary when the resin circulation pump 2.4 stops rotating.

[0039] Specifically, start volume printing. Wait until the resin in the resin sealed circulation loop stops flowing. The DLP projector 1.1 emits ultraviolet light that passes through the plano-convex lens 1.2 and the light refractive index matching bath 2.9, and irradiates the photosensitive resin in the double-pass glass tube 2.7. The photosensitive resin starts to accumulate light energy. At the same time, the hollow shaft motor 2.11 drives the double-pass glass tube 2.7 to rotate, the double-pass glass tube 2.7 drives the internal resin to rotate, the lead screw 1.5 drives the DLP projector 1.1 to move up and down, and the DLP projector 1.1 and the photosensitive resin in the double-pass glass tube 2.7 perform relative spiral scanning. Using the scanning method and reconstruction algorithm of spiral cone-beam industrial CT, calculate the light pattern corresponding to the lifting displacement of the DLP projector 1.1 and the rotation angle of the double-pass glass tube 2.7. A series of light patterns projected from multiple angles are emitted from the DLP projector 1.1 to expose the resin in the double-pass glass tube 2.7. At a given time, if the printing area does not reach the dose threshold, the resin does not solidify. After several up and down cycles and multi-angle exposures, the light dose accumulated inside the resin is sufficient to cure it, usually completed after 2 or 3 vertical cycles.

[0040] After the spiral volume printing is completed, start the resin circulation pump 2.4 in the forward direction, extract resin from the supply resin tank 3.6 and pump it into the suction pipe 2.5, and flow into the resin buffer bottle 2.1 through the resin supply elbow 2.2. Due to the incompressibility of the liquid and the characteristics of the fluid, and the relatively high viscosity of the photosensitive resin, when the resin flows into the double-pass glass tube 2.7, it will drive the solid that has completed volume printing into the recycling resin tank 3.17. The remaining uncured resin in the printing can pass through the coarse filter 3.2 in the recycling resin tank 3.17 and enter the resin fine filtration and rejuvenation system 3.

[0041] After the printed product flows into the recycling resin tank 3.17, the device will go through six stages to achieve the transportation and cleaning of the printed product. In the initial stage, after the resin circulation pump 2.4 stops running, the system detects the resin flow state in the double-pass glass tube 2.7; after the resin completely stops flowing, the finished product automatic post-treatment system 4 starts to operate. In the printed product transfer stage, the electric push rod 4.1 starts, driving the sliding push block 4.3 to push the printed product in the recycling resin tank 3.17 into the box groove; at this time, the right horizontal row of screens 4.15 has been positioned in the groove under the drive of the right chain 4.13, and its highest point is lower than the highest point of the groove. In the cleaning stage, after the printed product is transferred to the right horizontal row of screens 4.15, the screen moves towards the ultrasonic cleaning tank 4.12 under the drive of the right chain 4.13; at the same time, the left horizontal row of screens 4.22 has been positioned at the bottom of the ultrasonic cleaning tank 4.12 under the drive of the left chain 4.23. When the right horizontal row of screens 4.15 is completely immersed in the alcohol in the ultrasonic cleaning tank 4.12, the ultrasonic generating device is started to clean the printed product. In the finished product transfer stage, after cleaning, the left horizontal row of screens 4.22 rises under the drive of the left chain 4.23; the nylon columns of the two screens pass through each other due to the staggered arrangement, realizing the transfer of the printed product from the right horizontal row of screens 4.15 to the left horizontal row of screens 4.22. In the curing stage, the left horizontal row of screens 4.22 transports the printed product to the printed product storage box 4.21; when the nylon columns of the two components pass through each other due to the staggered arrangement, the printed product falls into the printed product storage box 4.21; the ultraviolet curing lamp 4.11 is started to perform light curing treatment on the printed product. In the system reset stage, the right horizontal row of screens 4.15 rises to the preset height under the drive of the right chain 4.13; the drying fan 4.5 is started to accelerate the volatilization of alcohol on the screen surface; after the alcohol is completely volatilized, the right horizontal row of screens 4.15 returns to the groove of the recycling resin tank 3.17, waiting for the next working cycle. Drive control description: The left chain 4.23 and the right chain 4.13 are respectively driven by the left sprocket group 4.17 and the right sprocket group 4.14, and the two sprocket groups are respectively driven by the left stepping motor 4.10 and the right stepping motor 4.20 controlled by the computer to realize the collection, ultrasonic cleaning and secondary curing of the printed product.

[0042] The resin fine filtration and activation system 3 operates relatively independently from the adaptive light source system 1 and the resin circulation system 2. The resin is heated to 80°C by the heating metal sheet after passing through the coarse filter 3.2. The originally highly viscous resin has its viscosity reduced due to the increase in temperature, which is beneficial for extraction and filtration. When the liquid level sensor 3.4 in the recycling resin tank 3.17 detects that the resin in the tank has accumulated to a certain amount, the resin peristaltic pump 3.8 connected to the recycling resin tank 3.17 is started. The resin peristaltic pump 3.8 quantitatively extracts 1L of resin from the recycling resin tank 3.17, filters the residual fine particles in the resin through the inverted plate filter 3.14, and then flows out of the inverted plate filter 3.14 and into the resin stirring and mixing tank 3.12.

[0043] Since photoinitiators and photo-inhibitors are usually in powder form and the required amounts are relatively small, it is difficult to control the amounts of the two added to the resin. Therefore, the photoinitiator and photo-inhibitor are respectively prepared into high-concentration photoinitiator and photo-inhibitor resin solutions according to several times the original concentrations, and are respectively filled into the resin and photoinitiator stock solution tank 3.11 and the resin and photo-inhibitor stock solution tank 3.10. Then, according to the calculated amounts of the photoinitiator and photo-inhibitor substances lacking in 1 L of the recycled resin, the volumes of the liquids to be extracted from the resin and photoinitiator stock solution tank 3.11 and the resin and photo-inhibitor stock solution tank 3.10 are estimated. The resin peristaltic pump 3.8 connecting the two tanks extracts the corresponding volumes of the resin and photoinitiator stock solution and the resin and photo-inhibitor stock solution into the resin stirring and mixing tank 3.12.

[0044] After 1 L of the filtered resin, the resin with the corresponding volume, the photoinitiator stock solution, and the resin and photo-inhibitor stock solution are all pumped into the resin stirring and mixing tank 3.12, the resin stirrer 3.9 is started to start stirring. At the same time, the heater and vibrator at the bottom of the resin stirring and mixing tank 3.12 are started to accelerate the dissipation of the bubbles in the resin after stirring.

[0045] After the components in the resin in the resin stirring and mixing tank 3.12 are stirred evenly and the bubbles are dissipated, the resin peristaltic pump 3.8 connected to the supply resin tank 3.6 extracts the resin in the resin stirring and mixing tank 3.12. After the resin enters the supply resin tank 3.6, its temperature is reduced to 25 °C by the refrigerating metal sheet 3.7, and finally the resin is restored to the initial components and temperature.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A continuous spiral cyclic volumetric printing device, characterized in that: It includes four parts: an adaptive light source system (1), a resin circulation system (2), a resin fine filtration and activation system (3), and a finished product automatic post-treatment system (4). The adaptive light source system (1) and the resin circulation system (2) are arranged on the upper part of the light source system support platform (1.3). The resin fine filtration and activation system (3) is arranged on the lower part of the light source system support platform (1.3). The finished product automatic post-treatment system (4) is arranged on the left side of the light source system support platform (1.3).

2. The continuous spiral cyclic volume printing device according to claim 1, wherein: The adaptive light source system (1) includes a DLP projector (1.1), a plano-convex lens (1.2), a light source system lifting platform (1.3), a lead screw drive motor (1.4), a lead screw (1.5), a set screw (1.6), a lifting platform (1.7), a guide rod (1.8), and a light source system fixing seat (1.9). The DLP projector (1.1) is fixed on the light source system fixing seat (1.9). The light source system fixing seat (1.9) is arranged on the chute of the lifting platform (1.7) and fixed in position by the set screw (1.6). The plano-convex lens (1.2) is arranged on the lifting platform (1.7). The lead screw drive motor (1.4) drives the lead screw (1.5) to rotate. The lead screw (1.5) drives the lifting platform (1.7) to move vertically along the guide rod (1.8). The lead screw (1.5) and the guide rod (1.8) are vertically fixed on the light source system support platform (1.3).

3. A continuous spiral cyclic volumetric printing device according to claim 1, characterized in that: The resin circulation system (2) includes a resin buffer bottle (2.1), a resin supply elbow (2.2), a hand-tightening clamp (2.3), a resin circulation pump (2.4), a fat suction pipe (2.5), a truss (2.6), a double-pass glass tube (2.7), a sealing flange cover (2.8), a light refractive index matching bath (2.9), a screw cap (2.10), a hollow shaft motor (2.11), a truss top plate (2.12), an O-ring seal (2.13), a 15-mm inner diameter rotary oil seal (2.14), a 30-mm inner diameter rotary oil seal (2.15), a deep groove ball bearing (2.16), and a platform support column (2.17); the resin circulation pump (2.4) is fixed on the light source system support platform (1.3). The suction end and the discharge end of the resin circulation pump (2.4) are respectively connected to the fat suction pipe (2.5) and the resin supply elbow (2.2). The other end of the fat suction pipe (2.5) is inserted into the resin in the supply resin tank (3.6). The other end of the resin supply elbow (2.2) is connected to the resin buffer bottle (2.1). The resin buffer bottle (2.1) is arranged on the truss top plate (2.12). The top of the hollow shaft motor (2.11) is connected to the truss top plate (2.12) by bolts. The bottom of the hollow shaft motor (2.11) is connected to the screw cap (2.10) by bolts. The screw cap (2.10) is threadedly connected to the outside of the upper mouth of the double-pass glass tube (2.7). The light refractive index matching bath (2.9) is fixed on the light source system support platform (1.3) by the platform support column (2.17). The double-pass glass tube (2.7) passes through the light refractive index matching bath (2.9) and its bottom sealing flange cover (2.8). The 30-mm inner diameter rotary oil seal (2.15) and the deep groove ball bearing (2.16) installed inside the bottom sealing flange cover (2.8) cooperate with the double-pass glass tube (2.7) to form a rotating pair. An avoidance hole is provided on the light source system support platform (1.3). The fat suction pipe (2.5) and the double-pass glass tube (2.7) pass through the avoidance hole and are inserted into the resin. The resin circulation pump (2.4) controls the resin to circulate and flow in the resin circulation system (2). The hollow shaft motor (2.11) controls and drives the double-pass glass tube (2.7) to rotate.

4. A continuous spiral cyclic volume printing device according to claim 1, wherein: The resin fine filtration and activation system (3) includes a component installation platform (3.1), a coarse filter screen (3.2), platform support columns (3.3), a liquid level sensor (3.4), a liquid level sensor (3.5), a supply resin tank (3.6), a refrigeration metal sheet (3.7), a resin peristaltic pump (3.8), a resin stirrer (3.9), a resin and photo-inhibitor stock solution tank (3.10), a resin and photo-inhibitor stock solution tank cover (3.10.1), a resin and photo-initiator stock solution tank (3.11), a resin and photo-initiator stock solution tank cover (3.11.1), a resin stirring and mixing barrel (3.12), a pipeline (3.13), an inverted plate type filter (3.14), a hand-tightening clamp (3.15), a heater (3.16), a recycled resin tank (3.17); the recycled resin tank (3.17) is separated from the chamber where the heating metal sheet (3.4) is located by a filter screen, and each tank body is connected to the resin peristaltic pump (3.8) and the inverted plate type filter (3.14) through respective pipelines (3.13), and the connection of the pipeline (3.13) is fixed by a hand-tightening clamp (3.15); liquid level sensors and temperature sensors are provided on both the recycled resin tank (3.17) and the supply resin tank (3.6); the resin stirring and mixing barrel (3.12) is internally provided with a resin stirrer (3.9), and a motor, a heater and a vibrator are installed at its bottom.

5. A continuous spiral cyclic volumetric printing device according to claim 1, characterized in that: The finished product automatic post-processing system (4) includes an electric push rod (4.1), a connecting component (4.2), a sliding push block (4.3), an electric push rod support seat (4.4), a drying fan (4.5), a right connecting slider (4.6), a right sprocket rack (4.7), a right moving frame (4.8), a right screen rack (4.9), a left stepping motor (4.10), an ultraviolet curing lamp (4.11), an ultrasonic cleaning tank (4.12), a right chain (4.13), a right sprocket set (4.14), a right horizontal row screen (4.15), a left sprocket rack (4.16), a left sprocket set (4.17), a left moving frame (4.18), a left screen rack (4.19), a right stepping motor (4.20), a printed product storage box (4.21), a left horizontal row screen (4.22), a left chain (4.23), and a left connecting slider (4.24); the electric push rod (4.1) is fixed on the component installation platform (3.1) through the electric push rod support seat (4.4), its push rod head is connected to the connecting component (4.2) by bolts, and the connecting component (4.2) is further rigidly connected to the sliding push block (4.3) by screws to form a linear moving pair, and a sealing device is provided at the connection between the sliding push block (4.3) and the recycled resin box (3.17); the right screen transportation mechanism composed of the right connecting slider (4.6), the right sprocket rack (4.7), the right moving frame (4.8), the right screen rack (4.9), the right stepping motor (4.20), the right chain (4.13), the right sprocket set (4.14), and the right horizontal row screen (4.15), the right horizontal row screen (4.15) is fixed to the right screen rack (4.9) by screws, and the right screen rack (4.9) is connected to the right connecting slider (4.6) by bolts; the right connecting slider (4.6) passes through the rectangular hole of the right moving frame (4.8) and is hinged to the inner and outer link plates of the right chain (4.13) by stud bolts, the right stepping motor (4.20) is fixed on the right sprocket rack (4.7) by bolts, the driving sprocket of the right sprocket set (4.14) is key-connected to the output shaft of the right stepping motor (4.20), the driven sprocket of the right sprocket rack (4.7) is installed at the other end of the right sprocket rack (4,7) after being fitted with bearings, and the right chain (4.13) is tensioned between the two sprockets; the left screen transportation mechanism composed of the left connecting slider (4.24), the left sprocket rack (4.16), the left moving frame (4.18), the left screen rack (4.19), the left stepping motor (4.10), the left chain (4.23), the left sprocket set (4.17), and the left horizontal row screen (4.22) has the same installation position and connection relationship as the right screen transportation mechanism, and after installation, the nylon columns of the left horizontal row screen (4.22) and the right horizontal row screen (4.15) are arranged in a staggered manner to ensure that there is no interference when the nylon column parts of the horizontal row screens cross each other.

6. The finished product automatic post-processing system (4) according to claim 5, wherein: The ultrasonic cleaning tank (4.12) is arranged between two sprocket racks. The tank is filled with alcohol with a concentration of 99%, and an ultrasonic generating device is integrated. The nylon columns of the printed product storage box (4.21) and the nylon columns on the left horizontal sieve (4.22) are arranged staggeredly to ensure that the nylon column parts of the two can pass through each other without interference. The drying fan (4.5) is installed on the right side of the right sprocket rack (4.7). The irradiation area of the ultraviolet curing lamp (4.11) covers the main body of the printed product storage box (4.21).

7. The adaptive light source system (1) according to claim 2, characterized in that: The central axes of the DLP projector (1.1), plano-convex lens (1.2), light refractive index matching bath (2.9), and double-pass glass tube (2.7) are in the same plane.

8. The resin circulation system (2) according to claim 3, characterized in that: The bottom opening of the resin buffer bottle (2.1) passes through the hollow shaft of the hollow shaft motor (2.11) and is inserted into the inner ring of the 15 mm inner diameter rotary oil seal (2.14). The outer ring of the 15 mm inner diameter rotary oil seal (2.14) is fixed in the central hole of the screw cap (2.10). When the hollow shaft motor (2.11) rotates, it drives the screw cap (2.10), the 15 mm inner diameter rotary oil seal (2.14), and the double-pass glass tube (2.7) to rotate. The 15 mm inner diameter rotary oil seal (2.14) rotates relative to the bottom opening of the resin buffer bottle (2.1). An O-ring seal is provided between the installation gap of the screw cap (2.10) and the hollow shaft motor (2.11). The liposuction tube (2.5), resin circulation pump (2.4), resin supply elbow (2.2), resin buffer bottle (2.1), screw cap (2.10), and all box pipelines are made of non-light-transmitting materials. The non-printing area of the double-pass glass tube (2.7) is sprayed with light-proof materials. The inner diameter of the double-pass glass tube (2.7) is 28 mm and the outer diameter is 30 mm.

9. The finished product automatic post-treatment system (4) according to claim 5, characterized in that: A sealing device is provided at the connection between the sliding push block (4.3) and the recycled resin box (3.17). The included angle between the nylon columns on the left horizontal sieve (4.22) and the right horizontal sieve (4.15) and the horizontal plane is 10°, and the nylon columns of the printed product storage box (4.21) form an included angle of 60° with the horizontal plane.

10. A continuous spiral cyclic volumetric printing device according to claim 1, characterized in that: The start and stop of the DLP projector (1.1), lead screw drive motor (1.4), hollow shaft motor (2.11), resin circulation pump (2.4), resin peristaltic pump (3.8), resin stirring and mixing barrel (3.12), left stepping motor (4.10), right stepping motor (4.20), ultraviolet curing lamp (4.11), and drying fan (4.5) are controlled by a computer.

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