3D printing equipment based on digital light processing technology

Abstract

The 3D printing equipment based on the digital light processing technology comprises a printing box, a photosensitive resin groove is fixedly connected to the lower side of the inner wall of the printing box, and an assembling opening is formed in one side of the inner wall of the printing box. By arranging the short pipe, the supply box, the liquid discharging pipe and the long pipe, when the liquid level is lower than the short pipe in the printing process, the short pipe makes contact with air, so that the short pipe can serve as an air inlet, and the pressure difference is generated in the supply box; therefore, liquid in the supply box is discharged and supplied through the liquid discharging pipe and the long pipe, the liquid level in the photosensitive resin groove can be controlled, the mechanism is simple, liquid supplementing operation can be automatically carried out according to changes of the liquid level, it is guaranteed that the liquid level is always kept within a proper range, the printing quality is guaranteed, and the printing efficiency is improved. And meanwhile, frequent manual inspection and resin supplement are not needed, so that the working efficiency of the equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing devices, and particularly to a 3D printing device based on digital light processing technology. Background Art

[0002] A 3D printing device based on digital light processing technology is an advanced manufacturing device that uses digital light processing technology to achieve the shaping of three-dimensional objects. Its core lies in using a digital micromirror device (DMD). After slicing and layering a three-dimensional model generated by a computer, it is converted into light irradiation according to the shape information of each layer. When the light irradiates the photosensitive resin, it will cause the resin to undergo a photopolymerization reaction, making it solidify layer by layer according to the preset shape. At the same time, in cooperation with a movable printing platform, corresponding position adjustments are made after each layer is solidified for the solidification operation of the next layer. Repeating this process, the solidified layers are finally stacked up to form a complete three-dimensional object.

[0003] Through retrieval, Chinese Patent Application No. CN201820970360.8 discloses a 3D printing device based on digital light processing, including a photosensitive resin tank, a motion module including a printing platform and a lifting structure for controlling the lifting of the printing platform. The bottom of the resin tank is a transparent oxygen-permeable film, and the bottom of the resin tank is connected to the resin tank wall through a connection structure; the connection structure includes a transparent tape, a clip, and a film installation fastener; the transparent tape is pasted on the edge of the bottom of the resin tank, and the bottom of the resin tank with the transparent tape pasted on the edge is closely arranged against the bottom of the resin tank wall. The clip is closely arranged against the edge of the bottom of the resin tank; one end of the film installation fastener passes through the clip and the transparent tape in sequence and is threadedly connected to the resin tank wall to fix the bottom of the resin tank on the resin tank wall; the 3D printing device based on digital light processing of the present invention solves the technical problem of low printing accuracy of the existing 3D printing device based on digital light processing through the improvement of the photosensitive resin tank and the printing platform.

[0004] Regarding the above related technologies, the inventor found the following defects: During printing, usually the raw materials inside the photosensitive resin tank will decrease as they solidify, resulting in a gradual change in the internal liquid level. When the liquid level becomes low, since it uses light treatment for solidification, the path of light passing through the resin will change, which may cause uneven distribution of light intensity in the resin, especially in the area at the bottom of the resin tank, where there is likely to be insufficient light intensity, making the resin cure incompletely, resulting in problems such as missing layers and missing blocks at the bottom of the model. When the liquid level drops, it is necessary to frequently stop the machine to add resin, which not only interrupts the continuity of printing, increases the preparation time and operations such as recalibration, but also affects the stability of the device due to frequent start and stop, reducing the printing efficiency. Therefore, it is very necessary to design a 3D printing device based on digital light processing technology with strong practicability and automatic liquid replenishment. Summary of the Invention

[0005] The object of the present invention is to provide a 3D printing device based on digital light processing technology to solve the problems raised in the above-mentioned background technology.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A 3D printing device based on digital light processing technology, including a printing box, a photosensitive resin tank is fixedly connected to the lower side of the inner wall of the printing box, an assembly port is opened on one side of the inner wall of the printing box, a supply box is fixedly connected to the inner wall of the assembly port, two supply ports are opened on one side of the inner wall of the supply box, drain pipes are fixedly connected to the inner walls of the two supply ports, a long pipe and a short pipe are slidably fitted on the two drain pipes, and an adjustment assembly is provided on one side of the supply box and is matched with the long pipe and the short pipe; A platform assembly is provided on one side of the inner wall of the printing box, a processing chamber is arranged inside the printing box, a light processing printer is arranged on the lower side of the inner wall of the processing chamber, and a sealing door is rotatably fitted on the front side of the printing box.

[0007] According to the above technical solution, the adjustment assembly includes an extension block fixedly connected to one side of the supply box, an adjustment screw rod threadedly fitted on the upper side of the extension block, and a connection block rotatably fitted at the lower end of the adjustment screw rod. The two ends of the connection block are respectively fixed to the long pipe and the short pipe.

[0008] According to the above technical solution, the platform assembly includes an electric slide rail fixedly connected to one side of the inner wall of the printing box, a bracket fixedly connected to the electric slide rail, and a solidification plate arranged under the bracket.

[0009] According to the above technical solution, heat dissipation ports are opened on both sides of the inner wall of the processing chamber, and filter cloths are fixedly connected to the inner walls of the two heat dissipation ports.

[0010] According to the above technical solution, a heat preservation box located outside the supply box is fixedly connected to one side of the printing box, a closing plate is rotatably fitted on the upper side of the heat preservation box, and a plurality of communication ports are opened on one side of the printing box and inside the inner wall of the heat preservation box.

[0011] According to the above technical solution, a cleaning port is opened on the upper side of the supply box, a sealing plate is arranged on the upper side of the supply box and is located above the cleaning port, a hand-tightening bolt is arranged between the sealing plate and the supply box, a liquid injection port is opened on the upper side of the sealing plate, and a sealing plug is arranged on the inner wall of the liquid injection port.

[0012] According to the above technical solution, an anti-rust screw rod is rotatably fitted on one side of the supply box, a plugging block that fits against the inner wall of the supply box is threadedly fitted on the anti-rust screw rod, the plugging block is matched with the two supply ports, and a stepping motor fixedly connected to the upper end of the anti-rust screw rod is fixedly connected to the upper side of the supply box.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: In the present invention, by providing a short pipe, a supply tank, a drain pipe, and a long pipe, it is possible to achieve that as the liquid level gradually drops during the printing process, when the liquid level is lower than the short pipe, the short pipe contacts the air, so that the short pipe can be used as an air inlet, generating a pressure difference inside the supply tank, and thus realizing the discharge and supply of the liquid inside the supply tank through the drain pipe and the long pipe, and further realizing the control of the liquid level inside the photosensitive resin tank. This makes the mechanism simple and can automatically perform the liquid supplement operation according to the change of the liquid level, ensuring that the liquid level always remains within a suitable range, guaranteeing the printing quality, and at the same time eliminating the need for frequent manual inspection and resin supplementation, thereby improving the working efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the overall sectional three-dimensional structural schematic diagram of the present invention; Figure 3 is the three-dimensional schematic diagram of the supply tank of the present invention; Figure 4 is the three-dimensional structural schematic diagram of the platform assembly of the present invention; Figure 5 is the side three-dimensional structural schematic diagram of the printing box of the present invention; In the figure: 1. Printing box; 2. Photosensitive resin tank; 3. Assembly port; 4. Supply tank; 5. Supply port; 6. Drain pipe; 7. Long pipe; 8. Short pipe; 9. Adjusting assembly; 901. Extension block; 902. Adjusting screw rod; 903. Connecting block; 10. Platform assembly; 101. Electric slide rail; 102. Bracket; 103. Solidification plate; 11. Processing chamber; 12. Light processing printer; 13. Sealing door; 14. Heat dissipation port; 15. Filter cloth; 16. Heat preservation box; 17. Closed plate; 18. Cleaning port; 19. Sealing plate; 20. Hand-tightening bolt; 21. Liquid injection port; 22. Sealing plug; 23. Rust-proof screw rod; 24. Plugging block; 25. Stepper motor; 26. Communication port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0016] Please refer to Figures 1-5 , the present invention provides a technical solution: a 3D printing device based on digital light processing technology, including a printing box 1. The lower side of the inner wall of the printing box 1 is fixedly connected with a photosensitive resin tank 2. The lower side of the inner wall of the photosensitive resin tank 2 can be made of a transparent material. An assembly port 3 is opened on one side of the inner wall of the printing box 1. A supply box 4 is fixedly connected to the inner wall of the assembly port 3. Two supply ports 5 are opened on one side of the inner wall of the supply box 4. Drain pipes 6 are fixedly connected to the inner walls of the two supply ports 5. A long pipe 7 and a short pipe 8 are slidably fitted on each of the two drain pipes 6. The long pipe 7 and the short pipe 8 slide outside the drain pipe 6 and are sealed. An adjusting assembly 9 is provided on one side of the supply box 4 and is matched with the long pipe 7 and the short pipe 8; A platform assembly 10 is provided on one side of the inner wall of the printing box 1. A processing chamber 11 is arranged inside the printing box 1. A light processing printer 12 is arranged on the lower side of the inner wall of the processing chamber 11. A sealing door 13 is rotatably fitted on the front side of the printing box 1. The light processing printer 12 can be a digital light processing projector, and its principle is the same as the model, principle and working mode of the projector in the prior art (publication number CN208514968U).

[0017] Please refer to Figure 3 , the adjusting assembly 9 includes an extension block 901 fixedly connected to one side of the supply box 4, an adjusting screw rod 902 threadedly engaged with the upper side of the extension block 901. The adjusting screw rod 902 can be made of stainless steel and has good resistance to weak acids and oxidation environments. A connecting block 903 is rotatably fitted at the lower end of the adjusting screw rod 902. Both ends of the connecting block 903 are fixed to the long pipe 7 and the short pipe 8 respectively. By rotating the adjusting screw rod 902 to rotate on the extension block 901, the adjusting screw rod 902 pushes the connecting block 903 to drive the long pipe 7 and the short pipe 8 to move up and down, so as to control the height of the liquid level inside the photosensitive resin tank 2. Different models and printing materials may require different liquid level heights to ensure printing quality, improving the applicable range of this structure. The parts inside that come into contact with the liquid are all made of stainless steel.

[0018] Please refer to Figure 2, the platform component 10 includes an electric slide rail 101 fixedly connected to one side of the inner wall of the printing box 1, a bracket 102 fixedly connected to the electric slide rail 101, and a solidification plate 103 arranged on the lower side of the bracket 102. The electric slide rail 101 is fixedly connected to one side of the inner wall of the printing box 1. It is the power drive part of the platform component 10 and is usually composed of a motor, a transmission mechanism (such as a lead screw or a belt), and a guide rail, which is a common existing technology. It can drive the bracket 102 and the solidification plate 103 to move upward step by step. Through the electric slide rail 101, the bracket 102 and the solidification plate 103 will be driven to move upward by a preset distance, and this distance is the thickness of the printing layer. Then, the light processing printer 12 will cure the next layer of resin, and so on until the entire model is printed.

[0019] Please refer to Figure 2 , heat dissipation openings 14 are provided on both sides of the inner wall of the processing chamber 11. Filter cloths 15 are fixedly connected to the inner walls of the two heat dissipation openings 14. The heat dissipation openings 14 are oppositely arranged and can be used for air inlet and outlet to dissipate heat from the light processing printer 12. The filter cloth 15 can filter dust and impurities in the flowing air to avoid causing optical effects on the light processing printer 12. A fan can be arranged on the inner wall of one of the two heat dissipation openings 14 to improve air flow and the effect in summer.

[0020] Please refer to Figure 1 and Figure 2 , a heat preservation box 16 is fixedly connected to one side of the printing box 1 and is located outside the supply box 4. A closing plate 17 is rotatably fitted to the upper side of the heat preservation box 16. A plurality of communication ports 26 are provided on one side of the printing box 1 and inside the inner wall of the heat preservation box 16. By arranging the heat preservation box 16 outside the supply box 4, temperature isolation of the supply box 4 can be achieved. The communication ports 26 can be used for heat conduction, so that the temperature of the supply box 4 is as close as possible to the temperature inside the printing box 1, and the temperature difference between the liquid inside the supply box 4 and the liquid between the photosensitive resin tanks 2 is reduced.

[0021] Please refer to Figure 2 , a cleaning port 18 is provided on the upper side of the supply box 4. A sealing plate 19 is arranged on the upper side of the supply box 4 and is located above the cleaning port 18. A hand-tightening bolt 20 is arranged between the sealing plate 19 and the supply box 4. A liquid injection port 21 is provided on the upper side of the sealing plate 19. A sealing plug 22 is arranged on the inner wall of the liquid injection port 21. When daily adding liquid, the liquid can be injected from the inside of the liquid injection port 21 by opening the sealing plug 22. By rotating the hand-tightening bolt 20, the sealing plate 19 can be disassembled, so that personnel can deeply clean the inside of the supply box 4 from the cleaning port 18. When the sealing plug 22 is located inside the liquid injection port 21, the supply box 4 is in a sealed state.

[0022] Please refer to Figure 2 and Figure 3, one side of the supply box 4 is rotatably fitted with an anti-rust screw rod 23, and a plugging block 24 that fits against the inner wall of the supply box 4 is in threaded fit with the anti-rust screw rod 23. The plugging block 24 cooperates with the two supply ports 5. A stepping motor 25 fixed to the upper end of the anti-rust screw rod 23 is fixedly connected to the upper side of the supply box 4. By starting the stepping motor 25, the anti-rust screw rod 23 can be rotated to control the plugging block 24 to open or close the supply port 5.

[0023] The implementation principle of this application is as follows: When in use, first inject photosensitive resin liquid into the photosensitive resin tank 2, so that the liquid submerges the short pipe 8. Then, start the stepping motor 25 to drive the plugging block 24 to move downward to cover the two supply ports 5. Pour the spare photosensitive resin liquid into the supply box 4, and then open the two supply ports 5 again. Drive the bracket 102 to move downward through the electric slide rail 101, so that the solidification plate 103 enters the photosensitive resin tank 2. Irradiate through the light treatment printer 12, and fix the material through the photosensitive resin tank 2. Move the platform assembly 10 upward correspondingly to achieve layer-by-layer stacking and realize printing; During printing, the photosensitive resin liquid in the photosensitive resin tank 2 will decrease in liquid level as it solidifies. When the liquid level is lower than the short pipe 8, the short pipe 8 contacts the air, so that the short pipe 8 can be used as an air inlet, causing a pressure difference inside the supply box 4, and thus discharging the liquid inside the supply box 4 from the corresponding drain pipe 6 and the long pipe 7. When the liquid level in the photosensitive resin tank 2 submerges the short pipe 8, the short pipe 8 stops admitting air and is sealed again, so that the liquid level in the photosensitive resin tank 2 can be controlled, enabling automatic liquid replenishment according to the change of the liquid level, ensuring that the liquid level always remains within a suitable range, guaranteeing the printing quality, and at the same time eliminating the need for frequent manual inspection and resin replenishment, thereby improving the working efficiency of the equipment; By rotating the adjusting screw rod 902 on the extension block 901, the adjusting screw rod 902 pushes the connecting block 903 to drive the long pipe 7 and the short pipe 8 to move up and down, so that the height of the liquid level inside the photosensitive resin tank 2 can be controlled. Different models and printing materials may require different liquid levels to ensure printing quality, thus expanding the applicable range of this structure.

[0024] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0025] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacement of some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A 3D printing device based on digital light processing technology, comprising a printing box (1), characterized in that: The lower side of the inner wall of the printing box (1) is fixedly connected with a photosensitive resin tank (2). One side of the inner wall of the printing box (1) is provided with an assembly opening (3). The inner wall of the assembly opening (3) is fixedly connected with a supply box (4). One side of the inner wall of the supply box (4) is provided with two supply ports (5). The inner walls of the two supply ports (5) are fixedly connected with drain pipes (6). A long pipe (7) and a short pipe (8) are slidably fitted on each of the two drain pipes (6). One side of the supply box (4) is provided with an adjustment assembly (9) that cooperates with the long pipe (7) and the short pipe (8). One side of the inner wall of the printing box (1) is provided with a platform assembly (10). A processing chamber (11) is arranged inside the printing box (1). A light processing printer (12) is arranged on the lower side of the inner wall of the processing chamber (11). A sealing door (13) is rotatably fitted on the front side of the printing box (1).

2. The 3D printing device based on digital light processing technology according to claim 1, characterized in that: The adjustment assembly (9) includes an extension block (901) fixedly connected to one side of the supply box (4), an adjustment screw rod (902) threadedly fitted on the upper side of the extension block (901), and a connecting block (903) rotatably fitted at the lower end of the adjustment screw rod (902). The two ends of the connecting block (903) are respectively fixed to the long pipe (7) and the short pipe (8).

3. A 3D printing device based on digital light processing technology according to claim 1, characterized in that: The platform assembly (10) includes an electric slide rail (101) fixedly connected to one side of the inner wall of the printing box (1), a bracket (102) fixedly connected to the electric slide rail (101), and a solidification plate (103) arranged under the bracket (102).

4. A 3D printing device based on digital light processing technology according to claim 1, characterized in that: Heat dissipation openings (14) are formed on both sides of the inner wall of the processing chamber (11). Filter cloths (15) are fixedly connected to the inner walls of the two heat dissipation openings (14).

5. A 3D printing device based on digital light processing technology according to claim 1, characterized in that: One side of the printing box (1) is fixedly connected with a heat preservation box (16) located outside the supply box (4). A closing plate (17) is rotatably fitted on the upper side of the heat preservation box (16). A plurality of communication openings (26) are formed on one side of the printing box (1) and inside the inner wall of the heat preservation box (16).

6. A 3D printing device based on digital light processing technology according to claim 1, characterized in that: A cleaning opening (18) is formed on the upper side of the supply box (4). A sealing plate (19) is arranged on the upper side of the supply box (4) and above the cleaning opening (18). A hand-tightening bolt (20) is arranged between the sealing plate (19) and the supply box (4). A liquid injection port (21) is formed on the upper side of the sealing plate (19). A sealing plug (22) is arranged on the inner wall of the liquid injection port (21).

7. A 3D printing device based on digital light processing technology according to claim 1, characterized in that: One side of the supply box (4) is rotatably fitted with an anti-rust screw rod (23). A blocking block (24) that fits against the inner wall of the supply box (4) is threadedly fitted on the anti-rust screw rod (23). The blocking block (24) cooperates with the two supply ports (5). A stepping motor (25) fixedly connected to the upper end of the anti-rust screw rod (23) is fixedly connected to the upper side of the supply box (4).

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